Technology is the making, usage and knowledge of tools, techniques, crafts, systems or methods of organization in order to solve a problem or serve some purpose. The word ''technology'' comes ; . The term can either be applied generally or to specific areas: examples include ''construction technology'', ''medical technology'', and ''information technology''.

Technologies significantly affect human as well as other animal species' ability to control and adapt to their natural environments. The human species' use of technology began with the conversion of natural resources into simple tools. The prehistorical discovery of the ability to control fire increased the available sources of food and the invention of the wheel helped humans in travelling in and controlling their environment. Recent technological developments, including the printing press, the telephone, and the Internet, have lessened physical barriers to communication and allowed humans to interact freely on a global scale. However, not all technology has been used for peaceful purposes; the development of weapons of ever-increasing destructive power has progressed throughout history, from clubs to nuclear weapons.

Technology has affected society and its surroundings in a number of ways. In many societies, technology has helped develop more advanced economies (including today's global economy) and has allowed the rise of a leisure class. Many technological processes produce unwanted by-products, known as pollution, and deplete natural resources, to the detriment of the Earth and its environment. Various implementations of technology influence the values of a society and new technology often raises new ethical questions. Examples include the rise of the notion of efficiency in terms of human productivity, a term originally applied only to machines, and the challenge of traditional norms.

Philosophical debates have arisen over the present and future use of technology in society, with disagreements over whether technology improves the human condition or worsens it. Neo-Luddism, anarcho-primitivism, and similar movements criticise the pervasiveness of technology in the modern world, opining that it harms the environment and alienates people; proponents of ideologies such as transhumanism and techno-progressivism view continued technological progress as beneficial to society and the human condition. Indeed, until recently, it was believed that the development of technology was restricted only to human beings, but recent scientific studies indicate that other primates and certain dolphin communities have developed simple tools and learned to pass their knowledge to other generations.

Definition and usage

The use of the term ''technology'' has changed significantly over the last 200 years. Before the 20th century, the term was uncommon in English, and usually referred to the description or study of the useful arts. The term was often connected to technical education, as in the Massachusetts Institute of Technology (chartered in 1861). "Technology" rose to prominence in the 20th century in connection with the second industrial revolution. The meanings of technology changed in the early 20th century when American social scientists, beginning with Thorstein Veblen, translated ideas from the German concept of Technik into "technology." In German and other European languages, a distinction exists between ''Technik'' and ''Technologie'' that is absent in English, as both terms are usually translated as "technology." By the 1930s, "technology" referred not to the study of the industrial arts, but to the industrial arts themselves. In 1937, the American sociologist Read Bain wrote that "technology includes all tools, machines, utensils, weapons, instruments, housing, clothing, communicating and transporting devices and the skills by which we produce and use them." Bain's definition remains common among scholars today, especially social scientists. But equally prominent is the definition of technology as applied science, especially among scientists and engineers, although most social scientists who study technology reject this definition. More recently, scholars have borrowed from European philosophers of "technique" to extend the meaning of technology to various forms of instrumental reason, as in Foucault's work on technologies of the self ("techniques de soi").

Dictionaries and scholars have offered a variety of definitions. The Merriam-Webster dictionary offers a definition of the term: "the practical application of knowledge especially in a particular area" and "a capability given by the practical application of knowledge". Ursula Franklin, in her 1989 "Real World of Technology" lecture, gave another definition of the concept; it is "practice, the way we do things around here". The term is often used to imply a specific field of technology, or to refer to high technology or just consumer electronics, rather than technology as a whole. Bernard Stiegler, in ''Technics and Time, 1'', defines technology in two ways: as "the pursuit of life by means other than life", and as "organized inorganic matter."

Technology can be most broadly defined as the entities, both material and immaterial, created by the application of mental and physical effort in order to achieve some value. In this usage, technology refers to tools and machines that may be used to solve real-world problems. It is a far-reaching term that may include simple tools, such as a crowbar or wooden spoon, or more complex machines, such as a space station or particle accelerator. Tools and machines need not be material; virtual technology, such as computer software and business methods, fall under this definition of technology.

The word "technology" can also be used to refer to a collection of techniques. In this context, it is the current state of humanity's knowledge of how to combine resources to produce desired products, to solve problems, fulfill needs, or satisfy wants; it includes technical methods, skills, processes, techniques, tools and raw materials. When combined with another term, such as "medical technology" or "space technology", it refers to the state of the respective field's knowledge and tools. "State-of-the-art technology" refers to the high technology available to humanity in any field.

Technology can be viewed as an activity that forms or changes culture. Additionally, technology is the application of math, science, and the arts for the benefit of life as it is known. A modern example is the rise of communication technology, which has lessened barriers to human interaction and, as a result, has helped spawn new subcultures; the rise of cyberculture has, at its basis, the development of the Internet and the computer. Not all technology enhances culture in a creative way; technology can also help facilitate political oppression and war via tools such as guns. As a cultural activity, technology predates both science and engineering, each of which formalize some aspects of technological endeavor.

Science, engineering and technology

The distinction between science, engineering and technology is not always clear. Science is the reasoned investigation or study of phenomena, aimed at discovering enduring principles among elements of the phenomenal world by employing formal techniques such as the scientific method. Technologies are not usually exclusively products of science, because they have to satisfy requirements such as utility, usability and safety.

Engineering is the goal-oriented process of designing and making tools and systems to exploit natural phenomena for practical human means, often (but not always) using results and techniques from science. The development of technology may draw upon many fields of knowledge, including scientific, engineering, mathematical, linguistic, and historical knowledge, to achieve some practical result.

Technology is often a consequence of science and engineering — although technology as a human activity precedes the two fields. For example, science might study the flow of electrons in electrical conductors, by using already-existing tools and knowledge. This new-found knowledge may then be used by engineers to create new tools and machines, such as semiconductors, computers, and other forms of advanced technology. In this sense, scientists and engineers may both be considered technologists; the three fields are often considered as one for the purposes of research and reference.

The exact relations between science and technology in particular have been debated by scientists, historians, and policymakers in the late 20th century, in part because the debate can inform the funding of basic and applied science. In the immediate wake of World War II, for example, in the United States it was widely considered that technology was simply "applied science" and that to fund basic science was to reap technological results in due time. An articulation of this philosophy could be found explicitly in Vannevar Bush's treatise on postwar science policy, ''Science—The Endless Frontier'': "New products, new industries, and more jobs require continuous additions to knowledge of the laws of nature... This essential new knowledge can be obtained only through basic scientific research." In the late-1960s, however, this view came under direct attack, leading towards initiatives to fund science for specific tasks (initiatives resisted by the scientific community). The issue remains contentious—though most analysts resist the model that technology simply is a result of scientific research.

History

Paleolithic (2.5 million – 10,000 BC)

The use of tools by early humans was partly a process of discovery, partly of evolution. Early humans evolved from a species of foraging hominids which were already bipedal, with a brain mass approximately one third that of modern humans. Tool use remained relatively unchanged for most of early human history, but approximately 50,000 years ago, a complex set of behaviors and tool use emerged, believed by many archaeologists to be connected to the emergence of fully modern language.

Stone tools

Human ancestors have been using stone and other tools since long before the emergence of ''Homo sapiens'' approximately 200,000 years ago. The earliest methods of stone tool making, known as the Oldowan "industry", date back to at least 2.3 million years ago, with the earliest direct evidence of tool usage found in Ethiopia within the Great Rift Valley, dating back to 2.5 million years ago. This era of stone tool use is called the ''Paleolithic'', or "Old stone age", and spans all of human history up to the development of agriculture approximately 12,000 years ago.

To make a stone tool, a "core" of hard stone with specific flaking properties (such as flint) was struck with a hammerstone. This flaking produced a sharp edge on the core stone as well as on the flakes, either of which could be used as tools, primarily in the form of choppers or scrapers. These tools greatly aided the early humans in their hunter-gatherer lifestyle to perform a variety of tasks including butchering carcasses (and breaking bones to get at the marrow); chopping wood; cracking open nuts; skinning an animal for its hide; and even forming other tools out of softer materials such as bone and wood.

The earliest stone tools were crude, being little more than a fractured rock. In the Acheulian era, beginning approximately 1.65 million years ago, methods of working these stone into specific shapes, such as hand axes emerged. The Middle Paleolithic, approximately 300,000 years ago, saw the introduction of the prepared-core technique, where multiple blades could be rapidly formed from a single core stone. The Upper Paleolithic, beginning approximately 40,000 years ago, saw the introduction of pressure flaking, where a wood, bone, or antler punch could be used to shape a stone very finely.

Fire

The discovery and utilization of fire, a simple energy source with many profound uses, was a turning point in the technological evolution of humankind. The exact date of its discovery is not known; evidence of burnt animal bones at the Cradle of Humankind suggests that the domestication of fire occurred before 1,000,000 BC; scholarly consensus indicates that Homo erectus had controlled fire by between 500,000 BC and 400,000 BC. Fire, fueled with wood and charcoal, allowed early humans to cook their food to increase its digestibility, improving its nutrient value and broadening the number of foods that could be eaten.

Clothing and shelter

Other technological advances made during the Paleolithic era were clothing and shelter; the adoption of both technologies cannot be dated exactly, but they were a key to humanity's progress. As the Paleolithic era progressed, dwellings became more sophisticated and more elaborate; as early as 380,000 BC, humans were constructing temporary wood huts. Clothing, adapted from the fur and hides of hunted animals, helped humanity expand into colder regions; humans began to migrate out of Africa by 200,000 BC and into other continents, such as Eurasia.

Neolithic through Classical Antiquity (10,000BC – 300AD)

Man's technological ascent began in earnest in what is known as the Neolithic period ("New stone age"). The invention of polished stone axes was a major advance because it allowed forest clearance on a large scale to create farms. The discovery of agriculture allowed for the feeding of larger populations, and the transition to a sedentist lifestyle increased the number of children that could be simultaneously raised, as young children no longer needed to be carried, as was the case with the nomadic lifestyle. Additionally, children could contribute labor to the raising of crops more readily than they could to the hunter-gatherer lifestyle.

With this increase in population and availability of labor came an increase in labor specialization. What triggered the progression from early Neolithic villages to the first cities, such as Uruk, and the first civilizations, such as Sumer, is not specifically known; however, the emergence of increasingly hierarchical social structures, the specialization of labor, trade and war amongst adjacent cultures, and the need for collective action to overcome environmental challenges, such as the building of dikes and reservoirs, are all thought to have played a role.

Metal tools

Continuing improvements led to the furnace and bellows and provided the ability to smelt and forge native metals (naturally occurring in relatively pure form). Gold, copper, silver, and lead, were such early metals. The advantages of copper tools over stone, bone, and wooden tools were quickly apparent to early humans, and native copper was probably used from near the beginning of Neolithic times (about 8000 BC). Native copper does not naturally occur in large amounts, but copper ores are quite common and some of them produce metal easily when burned in wood or charcoal fires. Eventually, the working of metals led to the discovery of alloys such as bronze and brass (about 4000 BC). The first uses of iron alloys such as steel dates to around 1400 BC.

Energy and Transport

Meanwhile, humans were learning to harness other forms of energy. The earliest known use of wind power is the sailboat. The earliest record of a ship under sail is shown on an Egyptian pot dating back to 3200 BC. From prehistoric times, Egyptians probably used the power of the Nile annual floods to irrigate their lands, gradually learning to regulate much of it through purposely built irrigation channels and 'catch' basins. Similarly, the early peoples of Mesopotamia, the Sumerians, learned to use the Tigris and Euphrates rivers for much the same purposes. But more extensive use of wind and water (and even human) power required another invention.

According to archaeologists, the wheel was invented around 4000 B.C. probably independently and nearly-simultaneously in Mesopotamia (in present-day Iraq), the Northern Caucasus (Maykop culture) and Central Europe. Estimates on when this may have occurred range from 5500 to 3000 B.C., with most experts putting it closer to 4000 B.C. The oldest artifacts with drawings that depict wheeled carts date from about 3000 B.C.; however, the wheel may have been in use for millennia before these drawings were made. There is also evidence from the same period of time that wheels were used for the production of pottery. (Note that the original potter's wheel was probably not a wheel, but rather an irregularly shaped slab of flat wood with a small hollowed or pierced area near the center and mounted on a peg driven into the earth. It would have been rotated by repeated tugs by the potter or his assistant.) More recently, the oldest-known wooden wheel in the world was found in the Ljubljana marshes of Slovenia.

The invention of the wheel revolutionized activities as disparate as transportation, war, and the production of pottery (for which it may have been first used). It didn't take long to discover that wheeled wagons could be used to carry heavy loads and fast (rotary) potters' wheels enabled early mass production of pottery. But it was the use of the wheel as a transformer of energy (through water wheels, windmills, and even treadmills) that revolutionized the application of nonhuman power sources.

Medieval and Modern history (300 AD —)

Innovations continued through the Middle Ages with new innovations such as silk, the horse collar and horseshoes in the first few hundred years after the fall of the Roman Empire. Medieval technology saw the use of simple machines (such as the lever, the screw, and the pulley) being combined to form more complicated tools, such as the wheelbarrow, windmills and clocks. The Renaissance brought forth many of these innovations, including the printing press (which facilitated the greater communication of knowledge), and technology became increasingly associated with science, beginning a cycle of mutual advancement. The advancements in technology in this era allowed a more steady supply of food, followed by the wider availability of consumer goods.

Starting in the United Kingdom in the 18th century, the Industrial Revolution was a period of great technological discovery, particularly in the areas of agriculture, manufacturing, mining, metallurgy and transport, driven by the discovery of steam power. Technology later took another step with the harnessing of electricity to create such innovations as the electric motor, light bulb and countless others. Scientific advancement and the discovery of new concepts later allowed for powered flight, and advancements in medicine, chemistry, physics and engineering. The rise in technology has led to the construction of skyscrapers and large cities whose inhabitants rely on automobiles or other powered transit for transportation. Communication was also improved with the invention of the telegraph, telephone, radio and television.

The second half of the 20th century brought a host of new innovations. In physics, the discovery of nuclear fission has led to both nuclear weapons and nuclear power. Computers were also invented and later miniaturized utilizing transistors and integrated circuits. These advancements subsequently led to the creation of the Internet. Humans have also been able to explore space with satellites (later used for telecommunication) and in manned missions going all the way to the moon. In medicine, this era brought innovations such as open-heart surgery and later stem cell therapy along with new medications and treatments. Complex manufacturing and construction techniques and organizations are needed to construct and maintain these new technologies, and entire industries have arisen to support and develop succeeding generations of increasingly more complex tools. Modern technology increasingly relies on training and education — their designers, builders, maintainers, and users often require sophisticated general and specific training. Moreover, these technologies have become so complex that entire fields have been created to support them, including engineering, medicine, and computer science, and other fields have been made more complex, such as construction, transportation and architecture.

Technology and philosophy

Technicism

Generally, technicism is a reliance or confidence in technology as a benefactor of society. Taken to extreme, technicism is the belief that humanity will ultimately be able to control the entirety of existence using technology. In other words, human beings will someday be able to master all problems and possibly even control the future using technology. Some, such as Stephen V. Monsma, connect these ideas to the abdication of religion as a higher moral authority.

Optimism

Optimistic assumptions are made by proponents of ideologies such as transhumanism and singularitarianism, which view technological development as generally having beneficial effects for the society and the human condition. In these ideologies, technological development is morally good. Some critics see these ideologies as examples of scientism and techno-utopianism and fear the notion of human enhancement and technological singularity which they support. Some have described Karl Marx as a techno-optimist.

Skepticism and Critics of Technology

On the somewhat skeptical side are certain philosophers like Herbert Marcuse and John Zerzan, who believe that technological societies are inherently flawed. They suggest that the inevitable result of such a society is to become evermore technological at the cost of freedom and psychological health.

Many, such as the Luddites and prominent philosopher Martin Heidegger, hold serious, although not entirely deterministic reservations, about technology (see "The Question Concerning Technology)". According to Heidegger scholars Hubert Dreyfus and Charles Spinosa, "Heidegger does not oppose technology. He hopes to reveal the essence of technology in a way that 'in no way confines us to a stultified compulsion to push on blindly with technology or, what comes to the same thing, to rebel helplessly against it.' Indeed, he promises that 'when we once open ourselves expressly to the essence of technology, we find ourselves unexpectedly taken into a freeing claim.'" What this entails is a more complex relationship to technology than either techno-optimists or techno-pessimists tend to allow.

Some of the most poignant criticisms of technology are found in what are now considered to be dystopian literary classics, for example Aldous Huxley's ''Brave New World'' and other writings, Anthony Burgess's ''A Clockwork Orange'', and George Orwell's ''Nineteen Eighty-Four''. And, in ''Faust'' by Goethe, Faust's selling his soul to the devil in return for power over the physical world, is also often interpreted as a metaphor for the adoption of industrial technology. More recently, modern works of science fiction, such as those by Philip K. Dick and William Gibson, and films (e.g. Blade Runner, Ghost in the Shell) project highly ambivalent or cautionary attitudes toward technology's impact on human society and identity.

The late cultural critic Neil Postman distinguished tool-using societies from technological societies and, finally, what he called "technopolies," that is, societies that are dominated by the ideology of technological and scientific progress, to the exclusion or harm of other cultural practices, values and world-views.

Darin Barney has written about technology's impact on practices of citizenship and democratic culture, suggesting that technology can be construed as (1) an object of political debate, (2) a means or medium of discussion, and (3) a setting for democratic deliberation and citizenship. As a setting for democratic culture, Barney suggests that technology tends to make ethical questions, including the question of what a good life consists in, nearly impossible, because they already give an answer to the question: a good life is one that includes the use of more and more technology.

Nikolas Kompridis has also written about the dangers of new technology, such as genetic engineering, nanotechnology, synthetic biology and robotics. He warns that these technologies introduce unprecedented new challenges to human beings, including the possibility of the permanent alteration of our biological nature. These concerns are shared by other philosophers, scientists and public intellectuals who have written about similar issues (e.g. Francis Fukuyama, Jürgen Habermas, William Joy, and Michael Sandel).

Another prominent critic of technology is Hubert Dreyfus, who has published books ''On the Internet'' and ''What Computers Still Can't Do''.

Another, more infamous anti-technological treatise is ''Industrial Society and Its Future'', written by Theodore Kaczynski (aka The Unabomber) and printed in several major newspapers (and later books) as part of an effort to end his bombing campaign of the techno-industrial infrastructure.

Appropriate technology

The notion of appropriate technology, however, was developed in the 20th century (e.g., see the work of Jacques Ellul) to describe situations where it was not desirable to use very new technologies or those that required access to some centralized infrastructure or parts or skills imported from elsewhere. The eco-village movement emerged in part due to this concern.

Technology and competitiveness

In 1983 a classified program was initiated in the US intelligence community to reverse the US declining economic and military competitiveness. The program, Project Socrates, used all source intelligence to review competitiveness worldwide for all forms of competition to determine the source of the US decline. What Project Socrates determined was that technology exploitation is the foundation of all competitive advantage and that the source of the US declining competitiveness was the fact that decision-making through the US both in the private and public sectors had switched from decision making that was based on technology exploitation (i.e., technology-based planning) to decision making that was based on money exploitation (i.e., economic-based planning) at the end of World War II.

Technology is properly defined as any application of science to accomplish a function. The science can be leading edge or well established and the function can have high visibility or be significantly more mundane but it is all technology, and its exploitation is the foundation of all competitive advantage.

Technology-based planning is what was used to build the US industrial giants before WWII (e.g., Dow, DuPont, GM) and it what was used to transform the US into a superpower. It was not economic-based planning.

Project Socrates determined that to rebuild US competitiveness, decision making through out the US had to readopt technology-based planning. Project Socrates also determined that countries like China and India had continued executing technology-based (while the US took its detour into economic-based) planning, and as a result had considerable advanced the process and were using it to build themselves into superpowers. To rebuild US competitiveness the US decision-makers needed adopt a form of technology-based planning that was far more advanced than that used by China and India.

Project Socrates determined that technology-based planning makes an evolutionary leap forward every few hundred years and the next evolutionary leap, the Automated Innovation Revolution, was poised to occur. In the Automated Innovation Revolution the process for determining how to acquire and utilize technology for a competitive advantage (which includes R&D) is automated so that it can be executed with unprecedented speed, efficiency and agility.

Project Socrates developed the means for automated innovation so that the US could lead the Automated Innovation Revolution in order to rebuild and maintain the country's economic competitiveness for many generations.

Other animal species

right|thumbnail|This adult gorilla uses a branch as a walking stick to gauge the water's depth; an example of technology usage by primates. The use of basic technology is also a feature of other animal species apart from humans. These include primates such as chimpanzees, some dolphin communities, and crows. Considering a more generic perspective of technology as ethology of active environmental conditioning and control, we can also refer to animal examples such as beavers and their dams, or bees and their honeycombs.

The ability to make and use tools was once considered a defining characteristic of the genus Homo. However, the discovery of tool construction among chimpanzees and related primates has discarded the notion of the use of technology as unique to humans. For example, researchers have observed wild chimpanzees utilising tools for foraging: some of the tools used include leaf sponges, termite fishing probes, pestles and levers. West African chimpanzees also use stone hammers and anvils for cracking nuts, as do capuchin monkeys of Boa Vista, Brazil.

Future technology

Theories of technology often attempt to predict the future of technology based on the high technology and science of the time.

See also

Bernard Stiegler

Golden hammer

Critique of technology

History of science and technology

Knowledge economy

Lewis Mumford

Luddite

Niche construction

Technology assessment

Timeline of historic inventions

Technological convergence

Technology and society

Technology tree

-ology

Science and technology

Science and technology in Argentina

Technological superpowers

Theories and concepts in technology

Appropriate technology

Diffusion of innovations

Paradigm

Philosophy of technology

Posthumanism

Precautionary principle

Strategy of technology

Techno-progressivism

Technocentrism

Technocracy

Technocriticism

Technological evolution

Technological determinism

Technological nationalism

Technology readiness level

Technological singularity

Technological society

Technorealism

Technological revival

Transhumanism

Technology Management

Economics of technology

Technocracy (bureaucratic)

Technocapitalism

Technological diffusion

Technology acceptance model

Technology lifecycle

Technology transfer

Energy accounting

Nanosocialism

Post-scarcity

Technology journalism

The Verge

Engadget

TechCrunch

Wired (magazine)

References

Further reading

.

Frank Popper (2007) ''From Technological to Virtual Art'', Leonardo Books, MIT Press

Charlie Gere (2005) ''Art, Time and Technology: Histories of the Disappearing Body'', Berg

Kevin Kelly. ''What Technology Wants''. New York, Viking Press, October 14, 2010, hardcover, 416 pages. ISBN 9780670022151

External links

W5H of Technology Technology for Kids

Science and Technology in the Southern world

RedHerring.com ~ The Business of Technology

WiTEC - The European Association for Women in Science, Engineering and Technology (SET)

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Carbon-fiber-reinforced polymer or carbon-fiber-reinforced plastic (CFRP or CRP), is a very strong and light fiber-reinforced polymer which contains carbon fibers. The polymer is most often epoxy, but other polymers, such as polyester, vinyl ester or nylon, are sometimes used. The composite may contain other fibers such as Kevlar, aluminium, glass fibers as well as carbon fiber.

Although it can be relatively expensive, it has many applications in aerospace and automotive fields, as well as in sailboats, and notably finds use in modern bicycles and motorcycles, where its high strength-to-weight ratio and good rigidity is of importance. Improved manufacturing techniques are reducing the costs and time to manufacture, making it increasingly common in small consumer goods as well, such as laptops, tripods, fishing rods, paintball equipment, archery equipment, racquet frames, stringed instrument bodies, drum shells, golf clubs, and pool/billiards/snooker cues.

Other terms used to refer to the material: ''carbon fiber'', ''graphite-reinforced polymer'' or ''graphite fiber-reinforced polymer'' (''GFRP'' is less common since it clashes with glass-(fiber)-reinforced polymer). In product advertisements, it is sometimes referred to simply as ''graphite fiber'' (''graphite fibre''), for short.

Manufacture

The process by which most carbon fiber-reinforced polymer is made varies, depending on the piece being created, the finish (outside gloss) required, and how many of this particular piece are going to be produced. In addition, The choice of matrix can have a profound effect on the properties of the finished composite.

Moulding

One method of producing graphite-epoxy parts is by layering sheets of carbon fiber cloth into a mold in the shape of the final product. The alignment and weave of the cloth fibers is chosen to optimize the strength and stiffness properties of the resulting material. The mold is then filled with epoxy and is heated or air-cured. The resulting part is very corrosion-resistant, stiff, and strong for its weight. Parts used in less critical areas are manufactured by draping cloth over a mold, with epoxy either preimpregnated into the fibers (also known as ''pre-preg'') or "painted" over it. High-performance parts using single molds are often vacuum-bagged and/or autoclave-cured, because even small air bubbles in the material will reduce strength.

Vacuum bagging

For simple pieces of which relatively few copies are needed, (1–2 per day) a vacuum bag can be used. A fiberglass, carbon fiber or aluminum mold is polished and waxed, and has a release agent applied before the fabric and resin are applied, and the vacuum is pulled and set aside to allow the piece to cure (harden). There are two ways to apply the resin to the fabric in a vacuum mold. One is called a wet layup, where the two-part resin is mixed and applied before being laid in the mold and placed in the bag. The other is a resin induction system, where the dry fabric and mold are placed inside the bag while the vacuum pulls the resin through a small tube into the bag, then through a tube with holes or something similar to evenly spread the resin throughout the fabric. Wire loom works perfectly for a tube that requires holes inside the bag. Both of these methods of applying resin require hand work to spread the resin evenly for a glossy finish with very small pin-holes. A third method of constructing composite materials is known as a dry layup. Here, the carbon fiber material is already impregnated with resin (prepreg) and is applied to the mold in a similar fashion to adhesive film. The assembly is then placed in a vacuum to cure. The dry layup method has the least amount of resin waste and can achieve lighter constructions than wet layup. Also, because larger amounts of resin are more difficult to bleed out with wet layup methods, prepreg parts generally have fewer pinholes. Pinhole elimination with minimal resin amounts generally require the use of autoclave pressures to purge the residual gases out.

Compression molding

A quicker method uses a compression mold. This is a two-piece (male and female) mold usually made out of fiberglass or aluminum that is bolted together with the fabric and resin between the two. The benefit is that, once it is bolted together, it is relatively clean and can be moved around or stored without a vacuum until after curing. However, the molds require a lot of material to hold together through many uses under that pressure.

Filament winding

For difficult or convoluted shapes, a filament winder can be used to make pieces.

Structure

Many carbon fiber-reinforced polymer parts are created with a single layer of carbon fabric, and filled with fiberglass. A tool called a chopper gun can be used to quickly create these types of parts. Once a thin shell is created out of carbon fiber, the chopper gun is a pneumatic tool that cuts fiberglass from a roll and sprays resin at the same time, so that the fiberglass and resin are mixed on the spot. The resin is either external mix, wherein the hardener and resin are sprayed separately, or internal, where they are mixed internally, which requires cleaning after every use.

The primary element of CFRP is a fibre. From that, an unidirectional sheet is usually created. These can be layered onto each other in a quasi-isotropic layup, e.g. 0, +60, -60 degrees relative to each other. From the elementary fibre, a bidirectional woven sheet can be created, i.e. a twill with a 2/2 weave.

Automotive uses

Carbon fiber-reinforced polymer is used extensively in high-end automobile racing. The high cost of carbon fiber is mitigated by the material's unsurpassed strength-to-weight ratio, and low weight is essential for high-performance automobile racing. Racecar manufacturers have also developed methods to give carbon fiber pieces strength in a certain direction, making it strong in a load-bearing direction, but weak in directions where little or no load would be placed on the member. Conversely, manufacturers developed omnidirectional carbon fiber weaves that apply strength in all directions. This type of carbon fiber assembly is most widely used in the "safety cell" monocoque chassis assembly of high-performance racecars.

Many supercars over the past few decades have incorporated CFRP extensively in their manufacture, using it for their monocoque chassis as well as other components.

Until recently, the material has had limited use in mass-produced cars because of the expense involved in terms of materials, equipment, and the relatively limited pool of individuals with expertise in working with it. Recently, several mainstream vehicle manufacturers have started to use CFRP in everyday road cars.

Use of the material has been more readily adopted by low-volume manufacturers who used it primarily for creating body-panels for some of their high-end cars due to its increased strength and decreased weight compared with the glass-reinforced polymer they used for the majority of their products.

Civil engineering applications

Carbon fiber reinforced polymer-[CFRP] has over the past two decades become an increasingly notable material used in structural engineering applications. Studied in an academic context as to its potential benefits in construction, it has also proved itself cost-effective in a number of field applications strengthening concrete, masonry, steel, cast iron, and timber structures. Its use in industry can be either for retrofitting to strengthen an existing structure or as an alternative reinforcing (or prestressing material) instead of steel from the outset of a project.

Retrofitting has become the increasingly dominant use of the material in civil engineering, and applications include increasing the load capacity of old structures (such as bridges) that were designed to tolerate far lower service loads than they are experiencing today, seismic retrofitting, and repair of damaged structures. Retrofitting is popular in many instances as the cost of replacing the deficient structure can greatly exceed its strengthening using CFRP.

Applied to reinforced concrete structures for flexure, CFRP typically has a large impact on strength (doubling or more the strength of the section is not uncommon), but only a moderate increase in stiffness (perhaps a 10% increase). This is because the material used in this application is typically very strong (e.g., 3000 MPa ultimate tensile strength, more than 10 times mild steel) but not particularly stiff (150 to 250 GPa, a little less than steel, is typical). As a consequence, only small cross-sectional areas of the material are used. Small areas of very high strength but moderate stiffness material will significantly increase strength, but not stiffness.

CFRP can also be applied to enhance shear strength of reinforced concrete by wrapping fabrics or fibers around the section to be strengthened. Wrapping around sections (such as bridge or building columns) can also enhance the ductility of the section, greatly increasing the resistance to collapse under earthquake loading. Such 'seismic retrofit' is the major application in earthquake-prone areas, since it is much more economic than alternative methods.

If a column is circular (or nearly so) an increase in axial capacity is also achieved by wrapping. In this application, the confinement of the CFRP wrap enhances the compressive strength of the concrete. However, although large increases are achieved in the ultimate collapse load, the concrete will crack at only slightly enhanced load, meaning that this application is only occasionally used.

Specialist ultra-high modulus CFRP (with tensile modulus of 420 GPa or more) is one of the few practical methods of strengthening cast-iron beams. In typical use, it is bonded to the tensile flange of the section, both increasing the stiffness of the section and lowering the neutral axis, thus greatly reducing the maximum tensile stress in the cast iron.

When used as a replacement for steel, CFRP bars could be used to reinforce concrete structures, however the applications are not common.

CFRP could be used as prestressing materials due to their high strength. The advantages of CFRP over steel as a prestressing material, namely its light weight and corrosion resistance, should enable the material to be used for niche applications such as in offshore environments. However, there are practical difficulties in anchorage of carbon fiber strands and applications of this are rare.

In the United States, Prestressed Concrete Cylinder Pipes (PCCP) account for a vast majority of water transmission mains. Due to their large diameters, failures of PCCP are usually catastrophic and affect large populations. Approximately 19,000 miles of PCCP have been installed between 1940 and 2006. Corrosion in the form of hydrogen embrittlement has been blamed for the gradual deterioration of the prestressing wires in many PCCP lines. Over the past decade, CFRPs have been utilized to internally line PCCP, resulting in a fully structural strengthening system. Inside a PCCP line, the CFRP liner acts as a barrier that controls the level of strain experienced by the steel cylinder in the host pipe. The composite liner enables the steel cylinder to perform within its elastic range, to ensure the pipeline's long-term performance is maintained. CFRP liner designs are based on strain compatibility between the liner and host pipe.

CFRP is a more costly material than its counterparts in the construction industry, glass fiber-reinforced polymer (GFRP) and aramid fiber-reinforced polymer (AFRP), though CFRP is, in general, regarded as having superior properties.

Much research continues to be done on using CFRP both for retrofitting and as an alternative to steel as a reinforcing or prestressing material. Cost remains an issue and long-term durability questions still remain. Some are concerned about the brittle nature of CFRP, in contrast to the ductility of steel. Though design codes have been drawn up by institutions such as the American Concrete Institute, there remains some hesitation among the engineering community about implementing these alternative materials. In part, this is due to a lack of standardization and the proprietary nature of the fiber and resin combinations on the market.

Other applications

The large majority of NHL ice hockey players use carbon-fiber sticks. Carbon-fiber-reinforced polymer has found a lot of use in high-end sports equipment such as racing bicycles. For the same strength, a carbon-fiber frame weighs less than a bicycle tubing of aluminum or steel. The choice of weave can be carefully selected to maximize stiffness. The variety of shapes it can be built into has further increased stiffness and also allowed aerodynamic considerations into tube profiles. Carbon fiber-reinforced polymer frames, forks, handlebars, seatposts, and crank arms are becoming more common on medium- and higher-priced bicycles. Carbon fiber-reinforced polymer forks are used on most new racing bicycles. Other sporting goods applications include rackets, fishing rods, longboards, and rowing shells.

Much of the fuselage of the new Boeing 787 Dreamliner and Airbus A350 XWB will be composed of CFRP, making the aircraft lighter than a comparable aluminum fuselage, with the added benefit of less maintenance thanks to CFRP's superior fatigue resistance .

Due to its high ratio of strength to weight, CFRP is widely used in micro air vehicles (MAVs). In MAVSTAR Project, the CFRP structures reduce the weight of the MAV significantly. In addition, the high stiffness of the CFRP blades overcome the problem of collision between blades under strong wind.

CFRP has also found application in the construction of high-end audio components such as turntables and loudspeakers, again due to its stiffness.

It is used for parts in a variety of musical instruments, including violin bows, guitar pickguards, and a durable ebony replacement for bagpipe chanters. It is also used to create entire musical instruments such as Blackbird Guitars carbon fiber rider models, Luis and Clark carbon fiber cellos, and Mix carbon fiber mandolins.

In firearms it can substitute for metal, wood, and fiberglass in many areas of a firearm in order to reduce overall weight. However, while it is possible to make the receiver out of synthetic material such as carbon fiber, many of the internal parts are still limited to metal alloys as current reinforced plastics are unsuitable replacements.

Shoe manufacturers use carbon fiber as a shank plate in their basketball sneakers to keep the foot stable. It usually runs the length of the sneaker just above the sole and is left exposed in some areas, usually in the arch of the foot.

CFRP is used, either as standard equipment or in aftermarket parts, in high-performance radio-controlled vehicles and aircraft, i.a. for the main rotor blades of radio controlled helicopters—which should be light and stiff to perform 3D maneuvers.

Fire resistance of polymers or thermoset composites is significantly improved if a thin layer of carbon fibers is molded near the surface—dense, compact layer of carbon fibers efficiently reflects heat.

IBM/Lenovo's ThinkPad laptops and several Sony laptop models use this technology.

Carbon fiber is a popular material to form the handles of high-end knives.

This material is used when manufacturing squash, tennis and badminton racquets.

Carbon-Graphite spars are used on the frames of high-end Sport kites

In 2006 Kookaburra Sport introduced cricket bats with a thin carbon fibre layer on the back which were endorsed and used in competitive matches by high-profile players including Ricky Ponting and Michael Hussey. The carbon fibre was claimed to increase the durability of the bats, however they were banned from all first-class matches by the ICC in 2007.

End of useful life/recycling

Carbon fiber-reinforced polymers (CFRPs) have a long service lifetime when protected from the sun. When it is time to decommission CFRPs, they cannot be melted down in air like many metals. When free of vinyl (PVC or polyvinyl chloride) and other halogenated polymers, CFRPs can be thermally decomposed via thermal depolymerization in an oxygen-free environment. This can be accomplished in a refinery in a one-step process. Capture and reuse of the carbon and monomers is then possible. CFRPs can also be milled or shredded at low temperature to reclaim the carbon fiber, however this process shortens the fibers dramatically. Just as with downcycled paper, the shortened fibers cause the recycled material to be weaker than the original material. There are still many industrial applications that do not need the strength of full-length carbon fiber reinforcement. For example, chopped reclaimed carbon fiber can be used in consumer electronics, such as laptops. It provides excellent reinforcement of the polymers used even if it lacks the strength-to-weight ratio of an aerospace component.

Despite its high initial strength-to-weight ratio, one structural limitation of CFRP is its lack of a fatigue endurance limit. As such, failure cannot be theoretically ruled out from a high enough number of stress cycles. By contrast, steel and certain other structural metals and alloys do have an estimable fatigue endurance limit. Because of the complex failure modes of such composites, the fatigue failure properties of CFRP are difficult to predict. As a result, when utilizing CFRP for critical cyclic-loading applications, engineers may need to employ considerable strength safety margins to provide suitable component reliability over a sufficiently long service life.

Carbon nanotube reinforced polymer (CNRP)

Carbon nanotube reinforced polymer (CNRP) is several times stronger than CFRP and is being introduced in the Lockheed Martin F-35 Lightning II‎ as a structural material.

See also

Carbon (fiber)

Carbon nanotube

References

External links

Japan Carbon Fiber Manufacturers Association (English)

Carbon fiber information from the Department of Polymer Science at University of Southern Mississippi

Engineers design composite bracing system for injured Hokie running back Cedric Humes

The New Steel a 1968 ''Flight'' article on the announcement of carbon fibre

Carbon Fibres - the First Five Years A 1971 ''Flight'' article on carbon fibre in the aviation field

Category:Composite materials Category:Aerospace materials

de:Kohlenstofffaserverstärkter Kunststoff fr:Carbon Fiber Reinforced Plastic id:Plastik diperkuat-grafit ja:繊維強化プラスチック#炭素繊維強化プラスチック (CFRP) ru:Углепластики tr:Karbon fiber takviyeli plastik

Coordinates	40°42′15.0″N73°55′4.0″N
name	Natsume Sōseki
birth date	February 09, 1867
birth place	Tokyo, Japan
death date	December 09, 1916
death place	Tokyo, Japan
occupation	Writer
genre	novels, short stories, poetry
notableworks	''Kokoro'', ''Botchan'', ''I Am a Cat''
influenced	virtually all subsequent Japanese novelists, Karatani Kōjin }}

, born , is widely considered to be the foremost Japanese novelist of the Meiji period (1868–1912). He is best known for his novels ''Kokoro'', ''Botchan'', ''I Am a Cat'' and his unfinished work ''Light and Darkness''. He was also a scholar of British literature and composer of haiku, Chinese-style poetry, and fairy tales. From 1984 until 2004, his portrait appeared on the front of the Japanese 1000 yen note.

Early years

Born as Natsume Kinnosuke in the town of Babashita in the Edo region of Ushigome (present Kikui, Shinjuku), Natsume began his life as an unwanted child, born to his mother late in her life, forty years old and his father then fifty-three. When he was born, he already had five siblings. Having five children and a toddler had created family insecurity and was in some ways a disgrace to the Natsume family. In 1868, a childless couple, Shiobara Masanosuke and his wife, adopted him until the age of nine, when the couple divorced. He returned to his family and was welcomed by his mother although regarded as a nuisance by his father. His mother died when he was fourteen, and his two eldest brothers died in 1887, intensifying his sense of insecurity.

Natsume attended the First Tokyo Middle School (now Hibiya High School), where he became enamored with Chinese literature, and fancied that he might someday become a writer. His desire to become an author arose when he was about fifteen when he told his older brother about his interest in literature. However, his family disapproved strongly of this course of action, and when Natsume entered the Tokyo Imperial University in September 1884, it was with the intention of becoming an architect. Although he preferred Chinese classics, he began studying English at that time, feeling that it might prove useful to him in his future career, as English was a necessity in Japanese college.

In 1887, Natsume met Masaoka Shiki, a friend who would give him encouragement on the path to becoming a writer, which would ultimately be his career. Shiki tutored him in the art of composing haiku. From this point on, he began signing his poems with the name Sōseki, which is a Chinese idiom meaning "stubborn". In 1890, he entered the English Literature department, and quickly mastered the English language. Natsume graduated in 1893, and enrolled for some time as a graduate student and part-time teacher at the Tokyo Normal School.

In 1895, Natsume began teaching at Matsuyama Middle School in Shikoku, which became the setting of his novel ''Botchan''. Along with fulfilling his teaching duties, Natsume published haiku and Chinese poetry in a number of newspapers and periodicals. He resigned his post in 1896, and began teaching at the Fifth High School in Kumamoto. On June 10 of that year, he married Nakane Kyoko.

In the United Kingdom, 1901–1903

In 1900, the Japanese government sent Natsume to study in Great Britain as "Japan's first Japanese English literary scholar". He visited Cambridge and stayed a night there, but gave up the idea of studying at the university because he could not afford it on his government scholarship. He studied instead at University College, London (UCL). He had a miserable time of it in London, spending most of his days indoors buried in books, and his friends feared that he might be losing his mind. He also visited Pitlochry in Scotland.

He lived in four different lodgings, only the last of which, lodging with Priscilla and her sister Elizabeth Leale in Clapham (see the photograph), proved satisfactory. Five years later, in his preface to ''Bungakuron'' (''The Criticism of Literature''), he wrote about the period: :The two years I spent in London were the most unpleasant years in my life. Among English gentlemen I lived in misery, like a poor dog that had strayed among a pack of wolves.

He got along well with the Leale sisters, who shared his love of literature (notably Shakespeare—his tutor at UCL was the Shakespeare scholar W. J. Craig—and Milton) and spoke fluent French, much to his admiration. The Leales were a Channel Island family, and Priscilla had been born in France. The sisters worried about Natsume's incipient paranoia and successfully urged him to get out more and take up cycling.

Despite his poverty, loneliness, and mental problems, he solidified his knowledge of English literature during this period and returned to Japan in 1903.

After his return to the Empire of Japan, he replaced Koizumi Yakumo (Lafcadio Hearn) at the First Higher School, and subsequently became a professor of English literature at Tokyo Imperial University, where he taught literary theory and literary criticism.

Literary career

Natsume's literary career began in 1903, when he began to contribute ''haiku'', ''renku'' (''haiku''-style linked verse), ''haitaishi'' (linked verse on a set theme) and literary sketches to literary magazines, such as the prominent ''Hototogisu,'' edited by his former mentor Masaoka Shiki, and later by Takahama Kyoshi. However, it was the public success of his satirical novel ''I Am a Cat'' in 1905 that won him wide public admiration as well as critical acclaim.

He followed on this success with short stories, such as ''Rondon tō'' ("Tower of London") in 1905 and the novels ''Botchan'' ("Little Master"), and ''Kusamakura'' ("Grass Pillow") in 1906, which established his reputation, and which enabled him to leave his post at the university for a position with ''Asahi Shimbun'' in 1907, and to begin writing full-time. Much of his work deals with the relation between Japanese culture and Western culture. Especially his early works are influenced by his studies in London; his novel ''Kairo-kō'' was the earliest and only major prose treatment of the Arthurian legend in Japanese. He began writing one novel a year until his death from a stomach ulcer in 1916.

Major themes in Natsume's works include ordinary people fighting against economic hardship, the conflict between duty and desire (a traditional Japanese theme; see giri), loyalty and group mentality versus freedom and individuality, personal isolation and estrangement, the rapid industrialization of Japan and its social consequences, contempt of Japan's aping of Western culture, and a pessimistic view of human nature. Natsume took a strong interest in the writers of the ''Shirakaba'' (White Birch) literary group. In his final years, authors such as Akutagawa Ryūnosuke and Kume Masao became close followers of his literary style.

Major works

Natsume's major works include: ''Wagahai wa Neko dearu'' ''Rondon Tō'' ''Kairo-kō'' 坊っちゃん ''Kusamakura'' ''Shumi no Iden'' ''Nihyaku-tōka'' 虞美人草 坑夫 ''Yume Jū-ya'' ''Sanshirō'' それから 門 ''Omoidasu Koto nado'' 彼岸過迄 ''Kōjin'' こころ ''Watakushi no Kojin Shugi'' 道草 ''Garasu Do no Uchi'' 明暗

Year	Japanese title		! English title	! Comments
rowspan="3"	1905	吾輩は猫である	|	''I Am a Cat''
倫敦塔	|	''The Tower of London''
薤露行	|	''Kairo-kō''
rowspan="4"	1906	|	''Botchan''	''Botchan''
草枕	|	Kusamakura (novel)>The Three Cornered World''(lit. ''The Grass Pillow'')	latest translation uses Japanese title
趣味の遺伝	|	''The Heredity of Taste''
二百十日	|	''The 210th Day''
1907 in literature	1907	|	''Gubijinsō''	''The Poppy''
rowspan="3"	1908	|	''Kōfu''	''The Miner''
夢十夜	|	''Ten Nights of Dreams''
三四郎	|	''Sanshiro''
1909 in literature	1909	|	''Sorekara''	Sorekara>And Then''
rowspan="2"	1910	|	''Mon''	The Gate (novel)>The Gate''
思い出す事など	|	''Spring Miscellany''
rowspan="2"	1912	|	''Higan Sugi Made''	''To the Spring Equinox and Beyond''
行人	|	The Wayfarer (novel)>The Wayfarer''
rowspan="2"	1914	|	''Kokoro''	''Kokoro''
私の個人主義	|	''My Individualism''	A famous speech
rowspan="2">1915 in literature	1915	|	''Michi Kusa''	''Grass on the Wayside''
硝子戸の中	|	''Inside My Glass Doors''	English translation, 2002
1916 in literature	1916	|	''Mei An''	''Light and Darkness, a novel''	Unfinished

See also

Anglo-Japanese relations

Japanese literature

List of Japanese authors

Natsume Fusanosuke – Natsume's grandson

Mizumura Minae – finished Natsume's last, unfinished novel, ''Light and Darkness''

Sources

Bargen, Doris D. ''Suicidal Honor: General Nogi and the Writings of Mori Ogai and Natsume Sōseki''. University of Hawaii Press (2006). ISBN 0824829980

Brodey, I. S. and S. I. Tsunematsu, ''Rediscovering Natsume Sōseki'', (Kent: Global Oriental, 2000)

Doi, Takeo, trans. by W. J. Tyler, ''The Psychological World of Natsume Sōseki''. Harvard University Asia Center (1976). ISBN 0674721160

Gessel, Van C. ''Three Modern Novelists: Soseki, Tanizaki, Kawabata.'' Kodansha International, 1993

Keene, Donald. ''Dawn to the West: Japanese Literature of the Modern Era: Fiction,'' Chapter 12. 2nd Revised Edition, Columbia University Press, 1998.

Milward, Peter. ''The Heart of Natsume Sōseki: First Impressions of His Novels''. Azuma Shobo (1981). ASIN: B000IK2690

Olson, Lawrence. ''Ambivalent Moderns: Portraits of Japanese Cultural Identity''. Savage, Maryland: Rowman & Littlefield (1992). ISBN 0847677397

Ridgeway, William N. ''A Critical Study of The Novels of Natsume Sōseki, 1867–1916''. Edwin Mellen Press (January 28, 2005). ISBN 0773462309

Yu, Beongchoeon. ''Natsume Sōseki''. Macmillan Publishing Company (1984). ISBN 0805728503

References

External links

natsumesoseki.com

Natsume Sōseki at かまくら GreenNet, the website of Kamakura City

Natsume Souseki at Meisaku Live

Video: House of Ogai Mori & Soseki Natsume

Natsume Souseki at Amazon Kindle Store

Sōseki page including links to the entire text of ''Kokoro''

Natsume Sōseki on aozora.gr.jp (complete texts with furigana)

Tohoku University: Natsume Soseki Library

Natsume Sōseki's grave

Category:1867 births Category:1916 deaths Category:Writers from Tokyo Category:People in Meiji period Japan Category:Japanese novelists Category:Japanese poets Category:Japanese short story writers Category:Japanese expatriates in the United Kingdom Category:University of Tokyo alumni Category:Pseudonymous writers

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