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Thursday, October 12, 2023

Chain mail

From Wikipedia, the free encyclopedia
A European mail shirt.

Chain mail is the name (also known as mail or maille, but also called chain mail or chainmail) of a type of armour consisting of small metal rings linked together in a pattern to form a mesh. It was in common military use between the 3rd century BC and the 16th century AD in Europe, while still being used in Asia, Africa, and the Middle East. A coat of this armour is often called a hauberk or sometimes a byrnie.

History

The Vachères warrior, 1st century BC, a statue depicting a Romanized Gaulish warrior wearing mail and a Celtic torc around his neck, bearing a Celtic-style shield.
Fresco of an ancient Macedonian soldier (thorakites) wearing mail armour and bearing a thureos shield

The earliest examples of surviving mail were found in the Carpathian Basin at a burial in Horný Jatov, Slovakia dated in the 3rd century BC, and in a chieftain's burial located in Ciumești, Romania. Its invention is commonly credited to the Celts, but there are examples of Etruscan pattern mail dating from at least the 4th century BC. Mail may have been inspired by the much earlier scale armour. Mail spread to North Africa, West Africa, the Middle East, Central Asia, India, Tibet, South East Asia, and Japan.

Herodotus wrote that the ancient Persians wore scale armour, but mail is also distinctly mentioned in the Avesta, the ancient holy scripture of the Persian religion of Zoroastrianism that was founded by the prophet Zoroaster in the 5th century BC.

Mail continues to be used in the 21st century as a component of stab-resistant body armour, cut-resistant gloves for butchers and woodworkers, shark-resistant wetsuits for defense against shark bites, and a number of other applications.

Etymology

The origins of the word mail are not fully known. One theory is that it originally derives from the Latin word macula, meaning spot or opacity (as in macula of retina). Another theory relates the word to the old French maillier, meaning to hammer (related to the modern English word malleable). In modern French, maille refers to a loop or stitch. The Arabic words "burnus", برنوس, a burnoose; a hooded cloak, also a chasuble (worn by Coptic priests) and "barnaza", برنز, to bronze, suggest an Arabic influence for the Carolingian armour known as "byrnie" (see below).

The first attestations of the word mail are in Old French and Anglo-Norman: maille, maile, or male or other variants, which became mailye, maille, maile, male, or meile in Middle English.

In early medieval Europe "byrn(ie)" was the equivalent of a "coat of mail"

Civilizations that used mail invented specific terms for each garment made from it. The standard terms for European mail armour derive from French: leggings are called chausses, a hood is a mail coif, and mittens, mitons. A mail collar hanging from a helmet is a camail or aventail. A shirt made from mail is a hauberk if knee-length and a haubergeon if mid-thigh length. A layer (or layers) of mail sandwiched between layers of fabric is called a jazerant.

A waist-length coat in medieval Europe was called a byrnie, although the exact construction of a byrnie is unclear, including whether it was constructed of mail or other armour types. Noting that the byrnie was the "most highly valued piece of armour" to the Carolingian soldier, Bennet, Bradbury, DeVries, Dickie, and Jestice indicate that:

There is some dispute among historians as to what exactly constituted the Carolingian byrnie. Relying... only on artistic and some literary sources because of the lack of archaeological examples, some believe that it was a heavy leather jacket with metal scales sewn onto it. It was also quite long, reaching below the hips and covering most of the arms. Other historians claim instead that the Carolingian byrnie was nothing more than a coat of mail, but longer and perhaps heavier than traditional early medieval mail. Without more certain evidence, this dispute will continue.

In Europe

Mail armour and equipment of Polish medium cavalryman, from the second half of the 17th century

The use of mail as battlefield armour was common during the Iron Age and the Middle Ages, becoming less common over the course of the 16th and 17th centuries when plate armour and more advanced firearms were developed. It is believed that the Roman Republic first came into contact with mail fighting the Gauls in Cisalpine Gaul, now Northern Italy. The Roman army adopted the technology for their troops in the form of the lorica hamata which was used as a primary form of armour through the Imperial period.

Panel from the Bayeux Tapestry showing Norman and Anglo-Saxon soldiers in mail armour. Note the scene of stripping a mail hauberk from the dead at the bottom.

After the fall of the Western Empire, much of the infrastructure needed to create plate armour diminished. Eventually the word "mail" came to be synonymous with armour. It was typically an extremely prized commodity, as it was expensive and time-consuming to produce and could mean the difference between life and death in a battle. Mail from dead combatants was frequently looted and was used by the new owner or sold for a lucrative price. As time went on and infrastructure improved, it came to be used by more soldiers. The oldest intact mail hauberk still in existence is thought to have been worn by Leopold III, Duke of Austria, who died in 1386 during the Battle of Sempach. Eventually with the rise of the lanced cavalry charge, impact warfare, and high-powered crossbows, mail came to be used as a secondary armour to plate for the mounted nobility.

By the 14th century, articulated plate armour was commonly used to supplement mail. Eventually mail was supplanted by plate for the most part, as it provided greater protection against windlass crossbows, bludgeoning weapons, and lance charges while maintaining most of the mobility of mail. However, it was still widely used by many soldiers, along with brigandines and padded jacks. These three types of armour made up the bulk of the equipment used by soldiers, with mail being the most expensive. It was sometimes more expensive than plate armour. Mail typically persisted longer in less technologically advanced areas such as Eastern Europe but was in use throughout Europe into the 16th century.

During the late 19th and early 20th century, mail was used as a material for bulletproof vests, most notably by the Wilkinson Sword Company. Results were unsatisfactory; Wilkinson mail worn by the Khedive of Egypt's regiment of "Iron Men" was manufactured from split rings which proved to be too brittle, and the rings would fragment when struck by bullets and aggravate the injury. The riveted mail armour worn by the opposing Sudanese Madhists did not have the same problem but also proved to be relatively useless against the firearms of British forces at the battle of Omdurman. During World War I, Wilkinson Sword transitioned from mail to a lamellar design which was the precursor to the flak jacket.

a mask with a leather upper with slits on the metal eyepieces, and a chain mail lower, modelled on a dummy head with a metal war helmet
WWI Splatter Mask on display at the Army Medical Services Museum

Chain mail was also used for face protection in World War I. Oculist Captain Cruise of the British Infantry designed a mail fringe to be attached to helmets to protect the upper face. This proved unpopular with soldiers, in spite of being proven to defend against a three-ounce (100 g) shrapnel round fired at a distance of one hundred yards (91 m). Another invention, a "splatter mask" or "splinter mask", consisted of rigid upper face protection and a mail veil to protect the lower face, and was used by early tank crews as a measure against flying steel fragments (spalling) inside the vehicle.

In Asia

Tibetan warrior in mail reinforced by additional mirror plate

Mail armour was introduced to the Middle East and Asia through the Romans and was adopted by the Sassanid Persians starting in the 3rd century AD, where it was supplemental to the scale and lamellar armour already used. Mail was commonly also used as horse armour for cataphracts and heavy cavalry as well as armour for the soldiers themselves. Asian mail could be just as heavy as the European variety and sometimes had prayer symbols stamped on the rings as a sign of their craftsmanship as well as for divine protection.

Mail armour is mentioned in the Quran as being a gift revealed by Allah to David:

21:80 It was We Who taught him the making of coats of mail for your benefit, to guard you from each other's violence: will ye then be grateful? (Yusuf Ali's translation)

Mughal Army

From the Abbasid Caliphate, mail was quickly adopted in Central Asia by Timur (Tamerlane) and the Sogdians and by India's Delhi Sultanate. Mail armour was introduced by the Turks in late 12th century and commonly used by Turk and the Mughal and Suri armies where it eventually became the armour of choice in India. Indian mail was constructed with alternating rows of solid links and round riveted links and it was often integrated with plate protection (mail and plate armour).

China

Mail was introduced to China when its allies in Central Asia paid tribute to the Tang Emperor in 718 by giving him a coat of "link armour" assumed to be mail. China first encountered the armour in 384 when its allies in the nation of Kuchi arrived wearing "armour similar to chains". Once in China, mail was imported but was not produced widely. Due to its flexibility, comfort, and rarity, it was typically the armour of high-ranking guards and those who could afford the exotic import (to show off their social status) rather than the armour of the rank and file, who used more common brigandine, scale, and lamellar types. However, it was one of the few military products that China imported from foreigners. Mail spread to Korea slightly later where it was imported as the armour of imperial guards and generals.

Japan

Edo period Japanese (samurai) chain armour or kusari gusoku

In Japan, mail is called kusari which means chain. When the word kusari is used in conjunction with an armoured item it usually means that mail makes up the majority of the armour composition. An example of this would be kusari gusoku which means chain armour. Kusari jackets, hoods, gloves, vests, shin guards, shoulder guards, thigh guards, and other armoured clothing were produced, even kusari tabi socks.

Kusari was used in samurai armour at least from the time of the Mongol invasion (1270s) but particularly from the Nambokucho Period (1336–1392). The Japanese used many different weave methods including a square 4-in-1 pattern (so gusari), a hexagonal 6-in-1 pattern (hana gusari) and a European 4-in-1 (nanban gusari). The rings of Japanese mail were much smaller than their European counterparts; they would be used in patches to link together plates and to drape over vulnerable areas such as the armpits.

Riveted kusari was known and used in Japan. On page 58 of the book Japanese Arms & Armor: Introduction by H. Russell Robinson, there is a picture of Japanese riveted kusari, and this quote from the translated reference of Sakakibara Kozan's 1800 book, The Manufacture of Armour and Helmets in Sixteenth-Century Japan, shows that the Japanese not only knew of and used riveted kusari but that they manufactured it as well.

... karakuri-namban (riveted namban), with stout links each closed by a rivet. Its invention is credited to Fukushima Dembei Kunitaka, pupil, of Hojo Awa no Kami Ujifusa, but it is also said to be derived directly from foreign models. It is heavy because the links are tinned (biakuro-nagashi) and these are also sharp-edged because they are punched out of iron plate

Butted or split (twisted) links made up the majority of kusari links used by the Japanese. Links were either butted together meaning that the ends touched each other and were not riveted, or the kusari was constructed with links where the wire was turned or twisted two or more times; these split links are similar to the modern split ring commonly used on keychains. The rings were lacquered black to prevent rusting, and were always stitched onto a backing of cloth or leather. The kusari was sometimes concealed entirely between layers of cloth.

Kusari gusoku or chain armour was commonly used during the Edo period 1603 to 1868 as a stand-alone defense. According to George Cameron Stone

Entire suits of mail kusari gusoku were worn on occasions, sometimes under the ordinary clothing

In his book Arms and Armor of the Samurai: The History of Weaponry in Ancient Japan, Ian Bottomley shows a picture of a kusari armour and mentions kusari katabira (chain jackets) with detachable arms being worn by samurai police officials during the Edo period. The end of the samurai era in the 1860s, along with the 1876 ban on wearing swords in public, marked the end of any practical use for mail and other armour in Japan. Japan turned to a conscription army and uniforms replaced armour.

Effectiveness

Mail hauberk from the Museum of Bayeux

Mail's resistance to weapons is determined by four factors: linkage type (riveted, butted, or welded), material used (iron versus bronze or steel), weave density (a tighter weave needs a thinner weapon to surpass), and ring thickness (generally ranging from 1.0–1.6 mm diameter (18 to 14 gauge) wire in most examples). Mail, if a warrior could afford it, provided a significant advantage when combined with competent fighting techniques.

When the mail was not riveted, a thrust from most sharp weapons could penetrate it. However, when mail was riveted, only a strong well-placed thrust from certain spears, or thin or dedicated mail-piercing swords like the estoc, could penetrate, and a pollaxe or halberd blow could break through the armour. Strong projectile weapons such as stronger self bows, recurve bows, and crossbows could also penetrate riveted mail. Some evidence indicates that during armoured combat, the intention was to actually get around the armour rather than through it—according to a study of skeletons found in Visby, Sweden, a majority of the skeletons showed wounds on less well protected legs. Although mail was a formidable protection, due to technological advances as time progressed, mail worn under plate armour (and stand-alone mail as well) could be penetrated by the conventional weaponry of another knight.

The flexibility of mail meant that a blow would often injure the wearer, potentially causing serious bruising or fractures, and it was a poor defence against head trauma. Mail-clad warriors typically wore separate rigid helms over their mail coifs for head protection. Likewise, blunt weapons such as maces and warhammers could harm the wearer by their impact without penetrating the armour; usually a soft armour, such as gambeson, was worn under the hauberk. Medieval surgeons were very well capable of setting and caring for bone fractures resulting from blunt weapons. With the poor understanding of hygiene, however, cuts that could get infected were much more of a problem. Thus mail armour proved to be sufficient protection in most situations.

Manufacture

A manuscript from 1698 showing the manufacture of mail

Several patterns of linking the rings together have been known since ancient times, with the most common being the 4-to-1 pattern (where each ring is linked with four others). In Europe, the 4-to-1 pattern was completely dominant. Mail was also common in East Asia, primarily Japan, with several more patterns being utilised and an entire nomenclature developing around them.

Historically, in Europe, from the pre-Roman period on, the rings composing a piece of mail would be riveted closed to reduce the chance of the rings splitting open when subjected to a thrusting attack or a hit by an arrow.

Up until the 14th century European mail was made of alternating rows of round riveted rings and solid rings. Sometime during the 14th century European mail makers started to transition from round rivets to wedge shaped rivets but continued using alternating rows of solid rings. Eventually European mail makers stopped using solid rings and almost all European mail was made from wedge riveted rings only with no solid rings. Both were commonly made of wrought iron, but some later pieces were made of heat-treated steel. Wire for the riveted rings was formed by either of two methods. One was to hammer out wrought iron into plates and cut or slit the plates. These thin pieces were then pulled through a draw plate repeatedly until the desired diameter was achieved. Waterwheel powered drawing mills are pictured in several period manuscripts. Another method was to simply forge down an iron billet into a rod and then proceed to draw it out into wire. The solid links would have been made by punching from a sheet. Guild marks were often stamped on the rings to show their origin and craftsmanship. Forge welding was also used to create solid links, but there are few possible examples known; the only well documented example from Europe is that of the camail (mail neck-defence) of the 7th century Coppergate helmet. Outside of Europe this practice was more common such as "theta" links from India. Very few examples of historic butted mail have been found and it is generally accepted that butted mail was never in wide use historically except in Japan where mail (kusari) was commonly made from butted links. Butted link mail was also used by the Moros of the Philippines in their mail and plate armours.

Modern uses

Practical uses

Neptunic shark suit

Mail is used as protective clothing for butchers against meat-packing equipment. Workers may wear up to 4 kg (8 lb) of mail under their white coats. Butchers also commonly wear a single mail glove to protect themselves from self-inflicted injury while cutting meat, as do many oyster shuckers.

Scuba divers sometimes use mail to protect them from sharkbite, as do animal control officers for protection against the animals they handle. In 1980, marine biologist Jeremiah Sullivan patented his design for Neptunic full coverage chain mail shark resistant suits which he had developed for close encounters with sharks. Shark expert and underwater filmmaker Valerie Taylor was among the first to develop and test shark suits in 1979 while diving with sharks.

Mail is widely used in industrial settings as shrapnel guards and splash guards in metal working operations.

Electrical applications for mail include RF leakage testing and being worn as a Faraday cage suit by tesla coil enthusiasts and high voltage electrical workers.

Stab-proof vests

Conventional textile-based ballistic vests are designed to stop soft-nosed bullets but offer little defense from knife attacks. Knife-resistant armour is designed to defend against knife attacks; some of these use layers of metal plates, mail and metallic wires.

Historical re-enactment

Roman soldier 175 A.D. from a northern province (re-enactment).

Many historical reenactment groups, especially those whose focus is Antiquity or the Middle Ages, commonly use mail both as practical armour and for costuming. Mail is especially popular amongst those groups which use steel weapons. A modern hauberk made from 1.5 mm diameter wire with 10 mm inner diameter rings weighs roughly 10 kg (22 lb) and contains 15,000–45,000 rings.

One of the drawbacks of mail is the uneven weight distribution; the stress falls mainly on shoulders. Weight can be better distributed by wearing a belt over the mail, which provides another point of support.

Mail worn today for re-enactment and recreational use can be made in a variety of styles and materials. Most recreational mail today is made of butted links which are galvanised or stainless steel. This is historically inaccurate but is much less expensive to procure and especially to maintain than historically accurate reproductions. Mail can also be made of titanium, aluminium, bronze, or copper. Riveted mail offers significantly better protection ability as well as historical accuracy than mail constructed with butted links. Japanese mail (kusari) is one of the few historically correct examples of mail being constructed with such butted links.

Decorative uses

Major's shoulder chains
A modern example of the use of mail, a bracelet using the roundmaille weave

Mail remained in use as a decorative and possibly high-status symbol with military overtones long after its practical usefulness had passed. It was frequently used for the epaulettes of military uniforms. It is still used in this form by some regiments of the British Army.

Mail has applications in sculpture and jewellery, especially when made out of precious metals or colourful anodized metals. Mail artwork includes headdresses, decorative wall hangings, ornaments, chess sets, macramé, and jewelry. For these non-traditional applications, hundreds of patterns (commonly referred to as "weaves") have been invented.

Large-linked mail is occasionally used as a fetish clothing material, with the large links intended to reveal – in part – the body beneath them.

In film

In some films, knitted string spray-painted with a metallic paint is used instead of actual mail in order to cut down on cost (an example being Monty Python and the Holy Grail, which was filmed on a very small budget). Films more dedicated to costume accuracy often use ABS plastic rings, for the lower cost and weight. Such ABS mail coats were made for The Lord of the Rings film trilogy, in addition to many metal coats. The metal coats are used rarely because of their weight, except in close-up filming where the appearance of ABS rings is distinguishable. A large scale example of the ABS mail used in the Lord of the Rings can be seen in the entrance to the Royal Armouries museum in Leeds in the form of a large curtain bearing the logo of the museum. It was acquired from the makers of the film's armour, Weta Workshop, when the museum hosted an exhibition of WETA armour from their films. For the film Mad Max Beyond Thunderdome, Tina Turner is said to have worn actual mail and she complained how heavy this was. Game of Thrones makes use of mail, notably during the "Red Wedding" scene.

Ultra-high-molecular-weight polyethylene

Ultra-high-molecular-weight polyethylene (UHMWPE, UHMW) is a subset of the thermoplastic polyethylene. Also known as high-modulus polyethylene (HMPE), it has extremely long chains, with a molecular mass usually between 3.5 and 7.5 million amu. The longer chain serves to transfer load more effectively to the polymer backbone by strengthening intermolecular interactions. This results in a very tough material, with the highest impact strength of any thermoplastic presently made.

UHMWPE is odorless, tasteless, and nontoxic. It embodies all the characteristics of high-density polyethylene (HDPE) with the added traits of being resistant to concentrated acids and alkalis, as well as numerous organic solvents. It is highly resistant to corrosive chemicals except oxidizing acids; has extremely low moisture absorption and a very low coefficient of friction; is self-lubricating (see boundary lubrication); and is highly resistant to abrasion, in some forms being 15 times more resistant to abrasion than carbon steel. Its coefficient of friction is significantly lower than that of nylon and acetal and is comparable to that of polytetrafluoroethylene (PTFE, Teflon), but UHMWPE has better abrasion resistance than PTFE.

Development

Polymerization of UHMWPE was commercialized in the 1950s by Ruhrchemie AG, which has changed names over the years. Today UHMWPE powder materials, which may be directly molded into a product's final shape, are produced by, Ticona, Braskem, Teijin (Endumax), Celanese, and Mitsui. Processed UHMWPE is available commercially either as fibers or in consolidated form, such as sheets or rods. Because of its resistance to wear and impact, UHMWPE continues to find increasing industrial applications, including the automotive and bottling sectors. Since the 1960s, UHMWPE has also been the material of choice for total joint arthroplasty in orthopedic and spine implants.

UHMWPE fibers branded as Dyneema, commercialized in the late 1970s by the Dutch chemical company DSM, and as Spectra, commercialized by Honeywell (then AlliedSignal), are widely used in ballistic protection, defense applications, and increasingly in medical devices, sailing, hiking equipment, climbing, and many other industries.

Structure and properties

Structure of UHMWPE, with n greater than 100,000

UHMWPE is a type of polyolefin. It is made up of extremely long chains of polyethylene, which all align in the same direction. It derives its strength largely from the length of each individual molecule (chain). Van der Waals forces between the molecules are relatively weak for each atom of overlap between the molecules, but because the molecules are very long, large overlaps can exist, adding up to the ability to carry larger shear forces from molecule to molecule. Each chain is attracted to the others with so many van der Waals forces that the whole of the inter-molecular strength is high. In this way, large tensile loads are not limited as much by the comparative weakness of each localized van der Waals force.

When formed into fibers, the polymer chains can attain a parallel orientation greater than 95% and a level of crystallinity from 39% to 75%. In contrast, Kevlar derives its strength from strong bonding between relatively short molecules.

The weak bonding between olefin molecules allows local thermal excitations to disrupt the crystalline order of a given chain piece-by-piece, giving it much poorer heat resistance than other high-strength fibers. Its melting point is around 130 to 136 °C (266 to 277 °F), and, according to DSM, it is not advisable to use UHMWPE fibres at temperatures exceeding 80 to 100 °C (176 to 212 °F) for long periods of time. It becomes brittle at temperatures below −150 °C (−240 °F).

The simple structure of the molecule also gives rise to surface and chemical properties that are rare in high-performance polymers. For example, the polar groups in most polymers easily bond to water. Because olefins have no such groups, UHMWPE does not absorb water readily, nor wet easily, which makes bonding it to other polymers difficult. For the same reasons, skin does not interact with it strongly, making the UHMWPE fiber surface feel slippery. In a similar manner, aromatic polymers are often susceptible to aromatic solvents due to aromatic stacking interactions, an effect aliphatic polymers like UHMWPE are immune to. Since UHMWPE does not contain chemical groups (such as esters, amides or hydroxylic groups) that are susceptible to attack from aggressive agents, it is very resistant to water, moisture, most chemicals, UV radiation, and micro-organisms.

Under tensile load, UHMWPE will deform continually as long as the stress is present—an effect called creep.

When UHMWPE is annealed, the material is heated to between 135 °C (275 °F) and 138 °C (280 °F) in an oven or a liquid bath of silicone oil or glycerine. The material is then cooled down at a rate of 5 °C/h (2.5 °F/ks) to 65 °C (149 °F) or less. Finally, the material is wrapped in an insulating blanket for 24 hours to bring to room temperature.

Production

Ultra-high-molecular-weight polyethylene (UHMWPE) is synthesized from its monomer ethylene, which is bonded together to form the base polyethylene product. These molecules are several orders of magnitude longer than those of familiar high-density polyethylene (HDPE) due to a synthesis process based on metallocene catalysts, resulting in UHMWPE molecules typically having 100,000 to 250,000 monomer units per molecule each compared to HDPE's 700 to 1,800 monomers.

UHMWPE is processed variously by compression moulding, ram extrusion, gel spinning, and sintering. Several European companies began compression molding UHMWPE in the early 1960s. Gel-spinning arrived much later and was intended for different applications.

In gel spinning a precisely heated gel of UHMWPE is extruded through a spinneret. The extrudate is drawn through the air and then cooled in a water bath. The end-result is a fiber with a high degree of molecular orientation, and therefore exceptional tensile strength. Gel spinning depends on isolating individual chain molecules in the solvent so that intermolecular entanglements are minimal. Entanglements make chain orientation more difficult, and lower the strength of the final product.

Applications

Fiber

LIROS Dyneema hollow

Dyneema and Spectra are brands of lightweight high-strength oriented-strand gels spun through a spinneret. They have yield strengths as high as 2.4 GPa (350,000 psi) and density as low as 0.97 g/cm (0.087 oz/in) (for Dyneema SK75). High-strength steels have comparable yield strengths, and low-carbon steels have yield strengths much lower (around 0.5 GPa (73,000 psi)). Since steel has a specific gravity of roughly 7.8, these materials have a strength-to-weight ratios eight times that of high-strength steels. Strength-to-weight ratios for UHMWPE are about 40% higher than for aramid. The high qualities of UHMWPE filament were discovered by Albert Pennings in 1968, but commercially viable products were made available by DSM in 1990 and Southern Ropes soon after.

Derivatives of UHMWPE yarn are used in composite plates in armor, in particular, personal armor and on occasion as vehicle armor. Civil applications containing UHMWPE fibers are cut-resistant gloves, tear-resistant hosiery, bow strings, climbing equipment, automotive winching, fishing line, spear lines for spearguns, high-performance sails, suspension lines on sport parachutes and paragliders, rigging in yachting, kites, and kite lines for kites sports.

For personal armor, the fibers are, in general, aligned and bonded into sheets, which are then layered at various angles to give the resulting composite material strength in all directions. Recently developed additions to the US Military's Interceptor body armor, designed to offer arm and leg protection, are said to utilize a form of UHMWPE fabric. A multitude of UHMWPE woven fabrics are available in the market and are used as shoe liners, pantyhose, fencing clothing, stab resistant vests and as composite liners for vehicles.

The use of UHMWPE rope for automotive winching offers several advantages over the more common steel wire. The key reason for changing to UHMWPE rope is improved safety. The lower mass of UHMWPE rope, coupled with significantly lower elongation at breaking, carries far less energy than steel or nylon, which leads to almost no snap-back. UHMWPE rope does not develop kinks that can cause weak spots, and any frayed areas that may develop along the surface of the rope cannot pierce the skin like broken wire strands can. UHMWPE rope is less dense than water, making water recoveries easier as the recovery cable is easier to locate than wire. The bright colours available also aid with visibility should the rope become submerged or dirty. Another advantage in automotive applications is the reduced weight of UHMWPE rope over steel cables. A typical 11 mm (0.43 in) UHMWPE rope of 30 m (98 ft) can weigh around 2 kg (4.4 lb), the equivalent steel wire rope would weigh around 13 kg (29 lb). One notable drawback of UHMWPE rope is its susceptibility to UV damage, so many users will fit winch covers in order to protect the cable when not in use. It is also vulnerable to heat damage from contact with hot components.

Spun UHMWPE fibers excel as fishing line, as they have less stretch, are more abrasion-resistant, and are thinner than the equivalent monofilament line.

In climbing, cord and webbing made of combinations of UHMWPE and nylon yarn have gained popularity for their low weight and bulk. They exhibit very low elasticity compared to their nylon counterparts, which translates to low toughness. The fiber's very high lubricity causes poor knot-holding ability, and it is mostly used in pre-sewn 'slings' (loops of webbing)—relying on knots to join sections of UHMWPE is generally not recommended, and if necessary it is recommended to use the triple fisherman's knot rather than the traditional double fisherman's knot.

Ships' hawsers and cables made from the fiber (0.97 specific gravity) float on sea water. "Spectra wires" as they are called in the towing boat community are commonly used for face wires as a lighter alternative to steel wires.

It is used in skis and snowboards, often in combination with carbon fiber, reinforcing the fiberglass composite material, adding stiffness and improving its flex characteristics. The UHMWPE is often used as the base layer, which contacts the snow, and includes abrasives to absorb and retain wax.

It is also used in lifting applications, for manufacturing low weight, and heavy duty lifting slings. Due to its extreme abrasion resistance it is also used as an excellent corner protection for synthetic lifting slings.

High-performance lines (such as backstays) for sailing and parasailing are made of UHMWPE, due to their low stretch, high strength, and low weight. Similarly, UHMWPE is often used for winch-launching gliders from the ground, as, in comparison with steel cable, its superior abrasion resistance results in less wear when running along the ground and into the winch, increasing the time between failures. The lower weight on the mile-long cables used also results in higher winch launches.

UHMWPE was used for the 30 km (19 mi) long, 0.6 mm (0.024 in) thick space tether in the ESA/Russian Young Engineers' Satellite 2 of September, 2007.

Dyneema Composite Fabric (DCF) is a laminated material consisting of a grid of Dyneema threads sandwiched between two thin transparent polyester membranes. This material is very strong for its weight, and was originally developed for use in racing yacht sails under the name 'Cuben Fiber'. More recently it has found new applications, most notably in the manufacture of lightweight and ultralight camping and backpacking equipment such as tents and backpacks.

In archery, UHMWPE is widely used as a material for bowstrings because of its low creep and stretch compared to, for example, Dacron (PET). Besides pure UHMWPE fibers, most manufacturers use blends to further reduce the creep and stretch of the material. In these blends, the UHMWPE fibers are blended with, for example, Vectran.

In skydiving, UHMWPE is one of the most common materials used for suspension lines, largely supplanting the earlier-used Dacron, being lighter and less bulky. UHMWPE has excellent strength and wear-resistance, but is not dimensionally stable (i.e. shrinks) when exposed to heat, which leads to gradual and uneven shrinkage of different lines as they are subject to differing amounts of friction during canopy deployment, necessitating periodic line replacement. It is also almost completely inelastic, which can exacerbate the opening shock. For that reason, Dacron lines continue to be used in student and some tandem systems, where the added bulk is less of a concern than the potential for an injurious opening. In turn, in high performance parachutes used for swooping, UHMWPE is replaced with Vectran and HMA (high-modulus aramid), which are even thinner and dimensionally stable, but exhibit greater wear and require much more frequent maintenance to prevent catastrophic failure. UHMWPE are also used for reserve parachute closing loops when used with automatic activation devices, where their extremely low coefficient of friction is critical for proper operation in the event of cutter activation.

Medical

UHMWPE has a clinical history as a biomaterial for use in hip, knee, and (since the 1980s), for spine implants. An online repository of information and review articles related to medical grade UHMWPE, known as the UHMWPE Lexicon, was started online in 2000.

Joint replacement components have historically been made from "GUR" resins. These powder materials are produced by Ticona, typically converted into semi-forms by companies such as Quadrant and Orthoplastics, and then machined into implant components and sterilized by device manufacturers.

UHMWPE was first used clinically in 1962 by Sir John Charnley and emerged as the dominant bearing material for total hip and knee replacements in the 1970s. Throughout its history, there were unsuccessful attempts to modify UHMWPE to improve its clinical performance until the development of highly cross-linked UHMWPE in the late 1990s.

One unsuccessful attempt to modify UHMWPE was by blending the powder with carbon fibers. This reinforced UHMWPE was released clinically as "Poly Two" by Zimmer in the 1970s. The carbon fibers had poor compatibility with the UHMWPE matrix and its clinical performance was inferior to virgin UHMWPE.

A second attempt to modify UHMWPE was by high-pressure recrystallization. This recrystallized UHMWPE was released clinically as "Hylamer" by DePuy in the late 1980s. When gamma irradiated in air, this material exhibited susceptibility to oxidation, resulting in inferior clinical performance relative to virgin UHMWPE. Today, the poor clinical history of Hylamer is largely attributed to its sterilization method, and there has been a resurgence of interest in studying this material (at least among certain research circles). Hylamer fell out of favor in the United States in the late 1990s with the development of highly cross-linked UHMWPE materials, however negative clinical reports from Europe about Hylamer continue to surface in the literature.

Highly cross-linked UHMWPE materials were clinically introduced in 1998 and have rapidly become the standard of care for total hip replacements, at least in the United States. These new materials are cross-linked with gamma or electron beam radiation (50–105 kGy) and then thermally processed to improve their oxidation resistance. Five-year clinical data, from several centers, are now available demonstrating their superiority relative to conventional UHMWPE for total hip replacement (see arthroplasty). Clinical studies are still underway to investigate the performance of highly cross-linked UHMWPE for knee replacement.

In 2007, manufacturers started incorporating anti-oxidants into UHMWPE for hip and knee arthroplasty bearing surfaces. Vitamin E (a-tocopherol) is the most common anti-oxidant used in radiation-cross-linked UHMWPE for medical applications. The anti-oxidant helps quench free radicals that are introduced during the irradiation process, imparting improved oxidation resistance to the UHMWPE without the need for thermal treatment. Several companies have been selling antioxidant-stabilized joint replacement technologies since 2007, using both synthetic vitamin E as well as hindered phenol-based antioxidants.

Another important medical advancement for UHMWPE in the past decade has been the increase in use of fibers for sutures. Medical-grade fibers for surgical applications are produced by DSM under the "Dyneema Purity" trade name.

Manufacturing

UHMWPE is used in the manufacture of PVC (vinyl) windows and doors, as it can endure the heat required to soften the PVC-based materials and is used as a form/chamber filler for the various PVC shape profiles in order for those materials to be 'bent' or shaped around a template.

UHMWPE is also used in the manufacture of hydraulic seals and bearings. It is best suited for medium mechanical duties in water, oil hydraulics, pneumatics, and unlubricated applications. It has a good abrasion resistance but is better suited to soft mating surfaces.

Wire/cable

Fluoropolymer / HMWPE insulation cathodic protection cable is typically made with dual insulation. It features a primary layer of a fluoropolymer such as ECTFE which is chemically resistant to chlorine, sulphuric acid and hydrochloric acid. Following the primary layer is an HMWPE insulation layer, which provides pliable strength and allows considerable abuse during installation. The HMWPE jacketing provides mechanical protection as well.

Marine infrastructure

UHMWPE is used in marine structures for the mooring of ships and floating structures in general. The UHMWPE forms the contact surface between the floating structure and the fixed one. Timber was and is used for this application also. UHMWPE is chosen as facing of fender systems for berthing structures because of the following characteristics:

  • Wear resistance: best among plastics, better than steel
  • Impact resistance: best among plastics, similar to steel
  • Low friction (wet and dry conditions): self-lubricating material

Five-year plans of China

From Wikipedia, the free encyclopedia

The Five-Year Plans (simplified Chinese: 五年计划; traditional Chinese: 五年計劃; pinyin: Wǔnián Jìhuà) are a series of social and economic development initiatives issued by the Chinese Communist Party (CCP) since 1953 in the People's Republic of China. Since 1949, the CCP has shaped the Chinese economy through the plenums of its Central Committee and national party congresses.

Planning is a key characteristic of the nominally socialist economies, and one plan established for the entire country normally contains detailed economic development guidelines for all its regions. In order to more accurately reflect China's transition from a Soviet-style command economy to a socialist market economy (socialism with Chinese characteristics), the plans since the 11th Five-Year Plan for 2006 to 2010 have been referred to in Chinese as "guidelines" (simplified Chinese: 规划; traditional Chinese: 規劃; pinyin: guīhuà) instead of as "plans" (simplified Chinese: 计划; traditional Chinese: 計劃; pinyin: jìhuà).

Role

Medium and long-term planning are central to coordinating state activity across many policy areas in China and China's Five-Year Plans are one of the most prominent examples of this approach. Through the Five-Year Plans, the CCP and the government establish their policy priorities. Five-Year Plans continue to be a central means of organizing policy in China, especially in the areas of environmental protection, education, and industrial policy.

The initial formulation of a Five-Year Plan beings with fairly short, general guidelines prepared by the CCP Central Committee in the fall prior to the start of a Plan period. More detailed plans are approved by the National People's Congress the following March. These plans establish national priorities and outline how they will be met. Administratively, the Plans result in the development of numerous specific action plans across different levels of administration. These programs evolve over the course of the plan period. As academic Sebastian Heilmann observes, this process is best viewed as a planning coordination and evaluation cycle rather than a unified blueprint.

China's Five-Year Plans have been praised for their efficiency, capabilities and their importance to rapid economic growth, development, corporate finance and industrial policies.

First Plan (1953–1957)

Chairman Mao and Various Leaders of the First Five Year Plan - 1956

Having restored a viable economic base, the leadership under Chairman Mao Zedong, Premier Zhou Enlai, and other revolutionary veterans sought to implement what they termed a socialist transformation of China. The First Five-Year Plan was deeply influenced by Soviet methodologies and assistance from Soviet planners. Industrial development was the primary goal. With Soviet assistance in the form of both funds and experts, China began to develop industries from scratch. Consistent with the focus on developing industry, northeast China was the region which received the greatest share of state funds during the First Plan.

The First Five-Year Plan phrased its developmental focus in the terminology of revolution. It attributed the backwards state of China's economy to contradictions between the developing productive forces and the capitalist relations of production. Agriculture, fishing, and forestry would be collectivized. Regarding commercial and services industries, the approach in the first Five-Year Plan was for the government to buy them out, including through coercing reluctant sellers if necessary.

Government control over industry was increased during this period by applying financial pressures and inducements to convince owners of private, modern firms to sell them to the state or convert them into joint public-private enterprises under state control. The Plan strained agricultural production. In terms of economic growth, the First Five-Year Plan was quite successful, especially in those areas emphasized by the Soviet-style development strategy. During this Plan period, China began developing a heavy-industrial base and brought its industrial production above what it had been prior to war. China also raised its agricultural production to above prewar levels, resulting primarily from gains in efficiency brought about by the reorganization and cooperation achieved through cooperative farming. Although urbanization had not been a specific goal of the plan's focus on industrialization, industrialization also prompted extensive urban growth. By 1956, China had completed its socialist transformation of the domestic economy.

Second Plan (1958–1962)

This plan was created to accomplish several tasks, including:

The Political Bureau of the CPC had determined that gross value of agricultural products should increase 270%; in fact, the gain was a considerably more modest 35%. The country saw increases in capital construction over those observed during the first Five-Year Plan and also saw significant increases in industry (doubling output value) and income (workers and farmers, increase by as much as 30%).

However, the Great Leap Forward, which diverted millions of agricultural workers into industry, and the great sparrow campaign, which led to an infestation of locusts, as well as unprecedented natural and weather based issues, caused a huge decrease in food production. Simultaneously, rural officials, under huge pressure to meet their quotas, vastly overstated how much grain was available. Thus, a massive nationwide famine ensued.

The policies of the Second Plan's Great Leap Forward departed from the approach in the Soviet-inspired First Plan, which stressed central command and extensive planning. Instead, the approach entailed local areas marshalling all available resources for large projects. In 1960–61, attempts were made to redirect twenty million workers into agricultural production and to reallocate investment into those industrial sectors that could further support agriculture. This shift was also in sharp contrast to the rapid industrialization seen in the First Five-Year Plan.

Third Plan (1966–1970)

The Third Plan was originally due early in 1963, but at that time China's economy was too dislocated, as a result of the failure of the Great Leap Forward and four poor harvests to permit any planned operations. As initially conceived, the Third Five Year Plan emphasized further development in China's already more developed coastal areas and a greater focus on consumer goods. It called for enhancing "eating, clothing, and daily use" items (chi, chuan, yong). During discussions of the Third Five Year Plan, Mao acknowledged that during the Great Leap Forward, "We set revenue too high and extended the infrastructure battlefront too long," and that it was "best to do less and well."

The Plan ultimately called for the prioritization of national defense in the light of a possible big war, actively preparing for conflicts and speeding up construction in three key areas; national defense, science and technology, and industry and transport infrastructure. The turn towards a greater emphasis on developing heavy industries and national defense industries was prompted by the Gulf of Tonkin incident, which increased fears among Chinese leadership that the United States would ultimately invade China. Support among leadership for Mao's proposed Third Front construction increased as a result and changed the direction of the Third Five Year Plan.

Fourth Plan (1971–1975)

The Fourth Five Year Plan sought decentralization and prioritized "small scale, indigenous, and labor intensive" development projects over "large scale, foreign, and capital intensive" development.

Fifth Plan (1976–1980)

The central government stipulated the 1976–1985 Ten Year Plan Outline of Developing National Economy (Draft) in 1975, which included the 5th Five-Year Plan.

In March 1978, the Ten Year Development Outline was amended because the original version in 1975 stipulated that by 1985, steel and petroleum outputs should reach 60 and 250 million tons respectively, and 120 large projects, including 10 steel production bases, nine non-ferrous metal bases, eight coal bases and 10 oil and gas fields, should be built. To achieve these goals, the government would invest 70 billion yuan in infrastructure construction, equaling total national investment over the previous 28 years. These were impossible targets and ran counter to economic development rules.

The Plan put forward suggestions to set up an independent and comparatively complete industrial system and national economic system from 1978 to 1980.

With the implementation of the Plan, considerable success was achieved. In 1977, the gross output value of industry and agriculture reached 505.5 billion yuan, 4.4% above-target and representing an increase of 10.4% compared with the previous year. Gross domestic product for 1978 reached 301 billion yuan, an increase of 12.3% compared with 1977, and an increase of 19.4% compared with 1976.

However, during this period, the Chinese economy developed too quickly, and the very high goals triggered the onset of yet another round of mistakes. In December 1978, the 3rd Plenary Session of the 11th Central Committee of the Chinese Communist Party shifted the work focus of the CCP to modernization. The Session emphasized that the development should follow economic rules and proposed readjustment and reform measures, which indicated that national economic development had entered a new phase, one of exploration and development. In April 1979, the central government formally put forward new principles of readjustment, reform, rectification and improvement.

Sixth Plan (1981–1985)

According to China Daily, the 6th Plan was first planned as part of the "Ten Year National Economic Development Plan Outline for 1976–1985" until the State Council decided to redraft the country's mid- and long-term plans in 1980. The 1982 national planning meeting was again mainly focused on the drafting of the Plan. It was only in December that year that the fifth meeting of the 5th National People's Congress officially ratified the Plan.

The Sixth Five-Year Plan was the first to address government policy support for solar PV panel manufacturing. Policy support for solar panel manufacturing has been a part of every Five-Year Plan since.

Seventh Plan (1986–1990)

In late September 1985, the Conference of CCP Delegates convened to adopt the "Proposal for the Seventh Five Year Plan" which was set to begin in 1986. The proposal demonstrated a shift from direct government control over enterprises to using indirect macroeconomic controls to "establish a new system for the socialist economy." In March 1986, the State Council submitted "The 7th Five Year Plan for National Economic and Social Development of the People's Republic of China, 1986–1990" to the Fourth Session of the Sixth National People's Congress for review and ratification. It was the first time in China's history that an all-round plan for social and economic development was created at the start of a new five-year plan.

The national goals of the Plan included speeding up development on the coast, with inland regions role's being to "support and accelerate coastal development." During this Plan period, different regions of China were encouraged to develop by leveraging their respective advantages. Coastal regions were instructed to focused on "the restructuring of traditional industries, new industries, and consumer goods production." Western regions were to focus on processing and agriculture. In central regions, energy, construction, and minerals were the focus.

Tenth Plan (2001–2005)

During the 10th Five-Year Plan, the strategic purpose of planning shifted from narrow, quantitative growth targets to coordinating structural and qualitative changes in economic and social growth targets.

The Plan described science, technology, and human resources as decisive areas to improve for China to catch-up with the most advanced countries.

Focuses included growing the services sector, developing domestic economic demand, rural urbanization, and western development.

Environmental sustainability was also addressed. Goals included increasing forest coverage to 18.2%, and the urban green rate to 35%. The total amount of major urban and rural pollutants discharged were targeted for a 10% reduction as compared with 2000, and more measures would be taken to protect and save natural resources.

Eleventh Plan (2006–2010)

The planning philosophy for the 11th Five-Year Plan was significantly shaped by a mid-term evaluation of the 10th Five-Year Plan. The 11th Five-Year Plan introduced a new category of "binding targets" (yueshuxing zhibiao) intended as government promises. These binding targets have since been used especially in non-economic policy areas like environmental protection and land management. Of 22 targets listed in the 11th Five-Year Plan, eight of them were binding targets. These binding targets were incorporated into the criteria for local cadre performance evaluations. The Plan also reflected a change in terminology to the allocation of administrative resourced via "programs" rather than "plans."

Twelfth Plan (2011–2015)

The Twelfth Five-Year Guideline was debated in mid-October 2010 at the fifth plenary session of the 17th Central Committee of the Chinese Communist Party, the same session in which Xi Jinping was selected as Vice Chairman of the Central Military Commission, and the full proposal for the plan was released following the plenum and approved by the National People's Congress on 14 March 2011. The plan shifted emphasis from investment towards consumption and development from urban and coastal areas toward rural and inland areas – initially by developing small cities and greenfield districts to absorb coastal migration. The plan also continued to advocate objectives set out in the Eleventh Five-Year Plan to enhance environmental protection, accelerate the process of opening and reform, and emphasize Hong Kong's role as a center of international finance. It prioritized more equitable wealth distribution, increased domestic consumption, and improved social infrastructure and social safety nets. Improvements in the social safety net were intended to reduce precautionary saving. The plan sought to expand the services industry in order to increase employment and continue urbanization to help raise real wages.

Thirteenth Plan (2016–2020)

Continuing themes from the Twelfth Five-Year Plan, the Thirteenth Five-Year Plan also sought to boost the services sector, increase urbanization, and expand the social safety net to reduce precautionary savings. It also emphasized innovation, the completion of building a moderately prosperous society, and started the "Made in China 2025" plan.

Fourteenth Plan (2021–2025)

The 14th Five-Year Plan was drafted during the fifth plenum of the 19th Central Committee held from 26 to 29 October 2020. Han Wenxiu, the deputy director of the Office of the Central Finance and Economic Commission, said CCP general secretary Xi Jinping had personally led the drafting process through multiple meetings of the Politburo, its standing committee, and the drafting panel that he headed.

The Plan was drafted against the backdrop of worsening China–United States relations and the COVID-19 pandemic, which caused China's economy to shrink in the first quarter of 2020 – the first time in 44 years. Continuing themes from the prior two plans, the Thirteenth Five-Year Plan also seeks to boost the services sector, increase urbanization, and expand the social safety net to reduce precautionary savings. To address the aging of China's population, the Plan seeks to expand healthcare and retirement system initiatives. The Plan also emphasizes high-tech innovation.

Energy security of the People's Republic of China

Energy security of the People's Republic of China concerns the need for the People's Republic of China to guarantee itself and its industries long- term access to sufficient energy and raw materials. China has been endeavoring to sign international agreements and secure such supplies; its energy security involves the internal and foreign energy policy of China. Currently, China's energy portfolio consists mainly of domestic coal, oil and gas from domestic and foreign sources, and small quantities of uranium. China has also created a strategic petroleum reserve, to secure emergency supplies of oil for temporary price and supply disruptions. Chinese policy focuses on diversification to reduce oil imports, which used to rely almost exclusively on producers in the Middle East.

Coal supplied most (about 58%) of China’s total energy consumption in 2019, down from 59% in 2018. The second-largest fuel source was petroleum and other liquids, accounting for 20% of the country’s total energy consumption in 2019. Although China has diversified its energy supplies and cleaner burning fuels have replaced some coal and oil use in recent years, hydroelectric sources (8%), natural gas (8%), nuclear power (2%), and other renewables (nearly 5%) accounted for relatively small but growing shares of China’s energy consumption. 4 The Chinese government intends to cap coal use to less than 58% of total primary energy consumption by 2020 in an effort to curtail heavy air pollution that has affected certain areas of the country in recent years. According to China’s estimates, coal accounted for a little less than 58% in 2019, which places the government within its goal. 5 Natural gas, nuclear power, and renewable energy consumption have increased during the past few years to offset the drop in coal use.

According to Professor Zha Daojiong, China's dependence on foreign sources of energy is not a threat to China's energy security, since the world energy market is not opposed to China's pursuit of growth and prosperity. The key issue is actually internal: growing internal consumption without energy efficiency threatens both China's growth and world oil markets. Chinese imports are a new determinant encouraging oil price rises on the world market, a concern to developed countries. The international community advocates a move toward energy efficiency and more transparency in China's quest for energy worldwide, to confirm China's responsibility as a member of the international community. Energy efficiency is the only way to avoid excessive Chinese demands on oil at the expense of industrialized and industrializing countries. International projects and technology transfers are ongoing, improving China's energy consumption and benefit the whole energy-importing world; this will also calm Western-Chinese diplomatic tensions. China is trying to establish long-term energy security by investment in oil and gas fields abroad and by diversifying its providers.

Background

Chinese oil reserves

Thanks to the transfer of Soviet oil extraction technologies prior to July 1960 and domestic reserves such as the Daqing oil field, the PRC became oil self-sufficient in 1963. A US-led embargo isolated the Chinese oil industry from 1950 to 1970, preventing it from selling on the world oil market. After the embargo was lifted, China reactivated its links with Japan and other industrialized nations thanks to its oil exports, which helped bring in foreign currencies and fund key industrial plants and technologies for developing its own export-oriented economy. Chinese oil exports peaked in 1985 at 30 million tons. Rapid reforms, in turn, increased domestic oil demand and led China to become a net oil importer in 1993, and net crude oil importer in 1996.

Since 1996 Chinese oil production has slowly and continuously decreased, while demand and imports have steadily increased. Future Chinese oil reserves (such as the Tarim basin) are difficult to extract, requiring specific technologies as well as the construction of pipelines thousands of kilometers long. As a result, such reserves would be very difficult to develop and not cost-effective, given current market prices.

Issues that China faces

Natural gas production in China (red) has not kept up with consumption (black), requiring increased imports of gas.

China's demand for oil

Oil production in China (red) has not kept up with rapidly increasing demand (black).

China is the world’s largest crude oil importer and the second-largest crude oil consumer. According to U.S. Energy Information Administration data, China’s crude oil imports in 2019 increased to an average of 10.1 million barrels per day (b/d), an increase of 0.9 million b/d from the 2018 average.

China’s top five crude suppliers, Saudi Arabia, Russia, Iraq, Angola, and Brazil, generated nearly 60% of Chinese crude oil imports for 2019.

China accounts for 40% of the 2004 oil-consumption increase, and thus is a key part of the cycle which had led to the oil price increase worldwide. China's import dependence remains at 60% as of 2014. In 2005, a campaign to increase energy efficiency was launched without official Ministry of Energy approval; since the campaign was sporadic, this objective seems hard to meet. Zha Daojiong encouraged increased management of oil and energy in China, noting that "It is fair to say that the threat from ineffective energy industry governance is probably as great as that from the international energy market.". A projection that China would reach South Korean levels of per-capita oil consumption in 30 years, combined with the current average global decline in production, could mean that up to 44 Mbbl/d (7,000,000 m3/d) (barrels per day) in production would have to be found in the next decade to keep up with increased demand and production declines. That would be the equivalent of roughly five times Saudi Arabia's production. Superimpose a production plateau of 100 Mbbl/d (16,000,000 m3/d), and significant real-price increases would be necessary to balance supply and demand. Such increases might have severe effects on the growth of emerging market economies such as China's.

Nuclear and coal

Nuclear power in China accounts for approximately 4.9% of China's electricity, this compares to about 20% in the United States. China still mainly relies on coal for electricity. China is first in the world in both coal production and consumption, which has sparked environmental concerns. In order to achieve environmental targets in combating pollution and global warming, China must ultimately improve its coal efficiency and switch to alternative energy sources.

Limitations of pipelines and stocks

China’s natural gas consumption rose by 9% in 2019 to 10.8 trillion cubic feet (Tcf) per year from 9.9 Tcf in 2018. China’s NOCs produced an estimated 6.3 cf of natural gas in 2019, 8% higher than in 2018

Three gas lines from Turkmenistan were completed in 2009, 2010 and 2014 respectively, bringing 1.9 Tcf a year China.

The Power of Siberia pipeline started delivering gas in Dec 2020. By 2025 it should deliver 2.1 Tcf a year to China.

China became the largest importer of LNG at the end of 2021. The U.S. Energy Information Administration (EIA) said China’s LNG imports averaged 10.3 Bcf/d between January and October – a 24% increase over the same period last year. China’s U.S. LNG imports increased by 0.9 Bcf/d from January to October to about 1.1 Bcf/d, ranking the U.S. second behind Australia, which provided 40% of China’s LNG imports during the period at an average of 4.1 Bcf/d. Qatar and Malaysia supplied China with amounts similar to those of the United States. All three countries provided about 11% of China’s total LNG imports through October. Another 19 countries rounded out China’s LNG supplies.

China's eastern and southern regions have chronic energy shortages, causing blackouts and limiting economic growth. For supplying these regions, liquefied natural gas from Australia and Indonesia is more feasible and cheaper to import than the Tarim basin pipeline. However, the first West–East Gas Pipeline from Xinjiang to Shanghai was commissioned in 2004, and construction of the second pipeline from Xinjiang to Guangzhou in Guangdong began in 2008.

Sinopec accounts for 80% of Chinese oil imports. Refinery capacity is continuously strained, and perennially lags behind fast domestic-demand growth. China has had to rely on entrepôt refineries located in Singapore, Japan and Korea. Oil and gas exploration in the Tarim Basin is ongoing. However, developing this potential reserve is currently not cost-effective due to technological limitations coupled with fluctuations in world oil prices. Therefore, this is considered by some as a last-resort option.

In China, the gas price is not market-driven, which causes uncertainty in the production process.

Energy efficiency

A key point for China's energy-security goal of reducing oil imports is to improve the efficiency of its domestic energy markets by accelerating pricing, regulatory and other reforms. China is actively looking for smart-energy technology.

Foreign relations

Chinese oil imports by region of origin

1990 2000 2004 2019
Mdl East 39.4% 53.5% 45.4% 44%
Africa 0% 23% 28.7% 19%
Asia Pacific 60.6% 15.1% 4.5% 3%
Russia NA NA 7% 15%
Western Hemisphere 0% 7.2% 14.3% 15%
Sources: CQE, p12-15; CES, p49. EIA

Middle East

On the issue of energy security, China relies mainly on Persian Gulf exports. In contrast with the US, China is not associated with the Arab–Israeli conflicts and may focus simply on oil supply from an economic standpoint. The increase in Chinese dependence on Persian Gulf oil also means an associated increasing economic dependence on Arabian exporters, who will probably not join hands to block exports to China.

Chinese dependence on the Middle East is also a cause of concern for the US. In 2004, when the Bush administration actively discouraged oil companies from investing in Iran, the Chinese company Sinopec did not comply with its call.

Recently, China has changed its anti-Western diplomatic stance to a softer, global, more efficient diplomacy with a focus on energy and raw-materials security. In post-2003 Iraq, China does its best to comply with UN sanctions.

Japan and Korea

When China became an oil importer during the 1990s, its relations with neighboring countries (as exporter to East Asia and importer of Korean and Japanese oil) changed. Its main oil provider changed in a few years from domestic production, to East Asian production, and then to Mideast production. On the other hand, despite insufficient domestic oil output China does its best to stabilize exports to Japan and Korea. China endeavors to continue energy relationships it has created with developed nations, since they contribute to China's energy security with investment and technology. More Chinese oil output is in Japanese, Korean, Chinese, and world interests. Since China lacks strategic entrepôt refineries, it relies heavily on refineries in Singapore, Japan, and Korea.

Taiwan

China's dependence on foreign oil weakens its ability to pressure Taiwan, since a conflict may trigger a US oil embargo as a consequence. Since Sudan is pro-Chinese and Chad was pro-Taiwan (and an oil producer since 2003), China had an interest in replacing Chad's president Idriss Déby with a pro-Chinese leader. The FUC Chad rebellion, based in Sudan and aiming to overthrow the pro-Taiwanese Déby, seems to have received Chinese diplomatic support as well as weapons and Sudanese oil. The 2006 Chadian coup d'état attempt failed after French Air Force intervention, but Déby then switched his friendship to Beijing; the field defeat became a Chinese strategic victory.

Russia

In February 2009, Russia and China signed an agreement in which a spur of the Eastern Siberia–Pacific Ocean oil pipeline to China would be built and Russia would supply China with 15 million tonnes of oil (300,000 barrels (48,000 m3) per day) each year for 20 years, in exchange for a loan worth US$25 billion to Russian companies Transneft and Rosneft for pipeline and oilfield development.

Australia

On August 19, 2009, Chinese petroleum company PetroChina signed an A$50 billion deal with American multinational petroleum company ExxonMobil to purchase liquefied natural gas from the Gorgon field in Western Australia; this was believed to be the largest contract ever signed between China and America – ensuring China a steady supply of LPG fuel for 20 years. This agreement has been formalised despite relations between Australia and China being at their lowest point in years following the Rio Tinto espionage case and the granting of a visa to Rebiya Kadeer to visit Australia.

Central Asia

China has constructed an oil pipeline from Kazakhstan and started construction of a Central Asia–China gas pipeline.

Sea lanes

Ratification of the Law of the Sea Treaty is linked to China's need to secure its oil and raw materials shipping from the Middle East, Africa, and Europe, since those materials have to pass through the Strait of Malacca and the Red Sea.

Oil diplomacy

The appearance of China on the world energy scene is somewhat disturbing for developed nations. China's relative energy inexperience also raises diplomatic difficulties. Strengthening ties with oil producers such as Iran, Sudan, Uzbekistan, Angola and Venezuela also raised concerns for U.S. and other Western diplomacy, since several of these countries are known to be anti-American and/or known for human rights abuses, political censorship, and widespread corruption. These moves seem to challenge Western powers, by strengthening anti-Western countries. But this is unlikely; as a developing consumer economy, China does not have much of a choice in its sources of supply.

Poor communication

It is claimed that Chinese oil companies are unaccustomed to political risks and avoiding diplomatic conflict. In any case, the Chinese government will still be seen as ultimately responsible for conflict resolution. Communication has also been a weak point for Chinese companies. Lack of transparency in cases such as Chinese involvement in Sudan have raised concern in the US, until it was revealed that most of the oil produced was sold on international markets. Lack of cooperation with other major oil companies has led to business clashes, spilling into the diplomatic arena when both sides call their respective governments to support their interests (CNOOC versus Chevron-Texaco for Unocal, for example).

Mathematical universe hypothesis

From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Mathematical_universe_hypothesis   ...