1.
Paint
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Paint is any liquid, liquefiable, or mastic composition that, after application to a substrate in a thin layer, converts to a solid film. It is most commonly used to protect, color, or provide texture to objects, Paint can be made or purchased in many colors—and in many different types, such as watercolor, synthetic, etc. Paint is typically stored, sold, and applied as a liquid, in 2001 and 2004, South African archeologists reported finds in Blombos Cave of a 100, 000-year-old human-made ochre-based mixture that could have been used like paint. Further excavation in the cave resulted in the 2011 report of a complete toolkit for grinding pigments. Cave paintings drawn with red or yellow ochre, hematite, manganese oxide, ancient colored walls at Dendera, Egypt, which were exposed for years to the elements, still possess their brilliant color, as vivid as when they were painted about 2,000 years ago. The Egyptians mixed their colors with a substance, and applied them separately from each other without any blending or mixture. They appear to have used six colors, white, black, blue, red, yellow and they first covered the area entirely with white, then traced the design in black, leaving out the lights of the ground color. They used minium for red, and generally of a dark tinge, pliny mentions some painted ceilings in his day in the town of Ardea, which had been done prior to the foundation of Rome. He expresses great surprise and admiration at their freshness, after the lapse of so many centuries, Paint was made with the yolk of eggs and therefore, the substance would harden and adhere to the surface it was applied to. Pigment was made from plants, sand, and different soils, Most paints used either oil or water as a base. The process was done by hand by the painters and exposed them to lead poisoning due to the white-lead powder, in 1718, Marshall Smith invented a Machine or Engine for the Grinding of Colours in England. It is not known precisely how it operated, but it was a device that increased the efficiency of pigment grinding dramatically. By the proper onset of the Industrial Revolution, paint was being ground in steam-powered mills, interior house painting increasingly became the norm as the 19th century progressed, both for decorative reasons and because the paint was effective in preventing the walls rotting from damp. Linseed oil was also used as an inexpensive binder. In 1866, Sherwin-Williams in the United States opened as a large paint-maker and it was not until the stimulus of World War II created a shortage of linseed oil in the supply market that artificial resins, or alkyds, were invented. Cheap and easy to make, they held the color well. The vehicle is composed of the binder, or, if it is necessary to thin the binder with a diluent like solvent or water, it is the combination of binder + diluent. In this case, once the paint has dried or cured very nearly all of the diluent has evaporated, thus, an important quantity in coatings formulation is the vehicle solids, sometimes called the resin solids of the formula
2.
Plant
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Plants are mainly multicellular, predominantly photosynthetic eukaryotes of the kingdom Plantae. The term is generally limited to the green plants, which form an unranked clade Viridiplantae. This includes the plants, conifers and other gymnosperms, ferns, clubmosses, hornworts, liverworts, mosses and the green algae. Green plants have cell walls containing cellulose and obtain most of their energy from sunlight via photosynthesis by primary chloroplasts and their chloroplasts contain chlorophylls a and b, which gives them their green color. Some plants are parasitic and have lost the ability to produce amounts of chlorophyll or to photosynthesize. Plants are characterized by sexual reproduction and alternation of generations, although reproduction is also common. There are about 300–315 thousand species of plants, of which the great majority, green plants provide most of the worlds molecular oxygen and are the basis of most of Earths ecologies, especially on land. Plants that produce grains, fruits and vegetables form humankinds basic foodstuffs, Plants play many roles in culture. They are used as ornaments and, until recently and in variety, they have served as the source of most medicines. The scientific study of plants is known as botany, a branch of biology, Plants are one of the two groups into which all living things were traditionally divided, the other is animals. The division goes back at least as far as Aristotle, who distinguished between plants, which generally do not move, and animals, which often are mobile to catch their food. Much later, when Linnaeus created the basis of the system of scientific classification. Since then, it has become clear that the plant kingdom as originally defined included several unrelated groups, however, these organisms are still often considered plants, particularly in popular contexts. When the name Plantae or plant is applied to a group of organisms or taxon. The evolutionary history of plants is not yet settled. Those which have been called plants are in bold, the way in which the groups of green algae are combined and named varies considerably between authors. Algae comprise several different groups of organisms which produce energy through photosynthesis, most conspicuous among the algae are the seaweeds, multicellular algae that may roughly resemble land plants, but are classified among the brown, red and green algae. Each of these groups also includes various microscopic and single-celled organisms
3.
Ground (electricity)
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Electrical circuits may be connected to ground for several reasons. In mains powered equipment, exposed parts are connected to ground to prevent user contact with dangerous voltage when electrical insulation fails. In electrical power systems, a protective ground conductor is an essential part of the safety Earthing system. Connection to ground also limits the build-up of static electricity when handling flammable products or electrostatic-sensitive devices, in some telegraph and power transmission circuits, the earth itself can be used as one conductor of the circuit, saving the cost of installing a separate return conductor. For measurement purposes, the Earth serves as a constant potential reference against which other potentials can be measured, an electrical ground system should have an appropriate current-carrying capability to serve as an adequate zero-voltage reference level. In electronic circuit theory, a ground is usually idealized as a source or sink for charge. Where a real ground connection has a significant resistance, the approximation of zero potential is no longer valid, stray voltages or earth potential rise effects will occur, which may create noise in signals or if large enough will produce an electric shock hazard. This is usually a large conductor attached to one side of the power supply which serves as the return path for current from many different components in the circuit. Long-distance electromagnetic telegraph systems from 1820 onwards used two or more wires to carry the signal and return currents. During dry weather, the ground connection often developed a high resistance, an electrical connection to earth can be used as a reference potential for radio frequency signals for certain kinds of antennas. The part directly in contact with the earth - the earth electrode - can be as simple as a rod or stake driven into the earth. Because high frequency signals can flow to earth due to capacitative effects, because of this, a complex system of buried rods and wires can be effective. An ideal signal ground maintains a fixed potential regardless of how much current flows into ground or out of ground. Some types of transmitting antenna systems in the VLF, LF, MF, sometimes a counterpoise is used as a ground plane, supported above the ground. Electrical power distribution systems are connected to ground to limit the voltage that can appear on distribution circuits. A distribution system insulated from ground may attain a high potential due to transient voltages caused by arcing, static electricity, a ground connection of the system dissipates such potentials and limits the rise in voltage of the grounded system. In a mains electricity wiring installation, the ground conductor typically refers to three different conductors or conductor systems as listed below. Equipment earthing conductors provide a connection between non-current-carrying metallic parts of equipment and the earth
4.
Aircraft maintenance
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Aircraft maintenance is the overhaul, repair, inspection or modification of an aircraft or aircraft component. Maintenance may include such tasks as ensuring compliance with Airworthiness Directives or Service Bulletins, the maintenance of aircraft is highly regulated, in order to ensure safe and correct functioning during flight. National regulations are coordinated under international standards, maintained by such as the International Civil Aviation Organization. The maintenance tasks, personnel and inspections are all tightly regulated, the Maintenance, Repair, Overhaul Market was US$135.1 Billion in 2015, three quarters of the $180.3 B aircraft production market. Of this, 60% is for civil aviation, air transport 48%, business and general aviation 9%, rotorcraft 3%, and military aviation is 40%, fixed wing 27% and rotary 13%. Of the $64.3 Billion air transport MRO market, 40% is for engines, 22% for components, 17% for line, 14% for airframe and its is projected to grow at 4. 1% per annum till 2025 to $96B. Aircraft maintenance is highly regulated, because the smallest slip can lead to an aircraft crashing with consequent loss of life, the International Civil Aviation Organization sets global standards which are then implemented by national and regional bodies around the world. Each Contracting State is expected to use in its own regulations the one it prefers, thus, aircraft maintenance technicians, engineers and mechanics all perform essentially the same role. However different countries use terms in different ways to define their individual levels of qualification. Recognised licenses for aircraft maintenance personnel include, Aircraft Maintenance Engineer, Aircraft Maintenance Technician, in the USA also called an Aviation Maintenance Technician or colloquially Airframes and Powerplants. Aircraft maintenance personnel in Europe must comply with Acceptable Means of Compliance Part 66, Certifying Staff, AMC Part 66 is based on Joint Aviation Regulations promulgated by the Joint Aviation Authorities and on Air Transport Association Specification 104. Aircraft maintenance checks are inspections that have to be done on all commercial/civil aircraft after a certain amount of time or usage. In the case of an aircraft this may be an Aircraft Maintenance Engineer or Aircraft Maintenance Technician. Automated aircraft inspection systems have the potential to make aircraft maintenance safer, various solutions are currently developed, a collaborative mobile robot named Air-Cobot, and drones
5.
Architectural conservation
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Architectural conservation describes the process through which the material, historical, and design integrity of humanitys built heritage are prolonged through carefully planned interventions. The individual engaged in pursuit is known as an architectural conservator-restorer. Decisions of when and how to engage in an intervention are critical to the ultimate conservation-restoration of cultural heritage, ultimately, the decision is value based, a combination of artistic, contextual, and informational values is normally considered. In some cases, a decision to not intervene may be the most appropriate choice, typically this process operates as a specialized aspect of a societys planning system, and its practitioners are termed built or historic environment conservation professionals. Architectural conservation is the process by which individuals or groups attempt to protect valued buildings from unwanted change, as a movement, architectural conservation in general, and the preservation of ancient structures specifically, gained momentum during the 18th and 19th centuries. Prior to this time most of the ancient buildings that were still standing had only survived because they either had significant cultural or religious import, the growth of the architectural conservation movement took place at a time of significant archaeological discovery and scientific advancement. Those educated in the field began to see examples of architecture as either being correct or incorrect. Because of this, two schools of thought began to emerge within the field of building conservation and this school of thought saw the original design of old buildings as correct in and of themselves. Two of the proponents of preservation and conservation in the 19th century were art critic John Ruskin. Restoration was the conservationist school of thought that believed historic buildings could be improved, and sometimes even completed, using current day materials, design, in this way its very similar to the Modernist architectural theory, except it does not advocate the destruction of ancient structures. One of the most ardent supporters of school of thought in the 19th century was the French architect Eugène Viollet-le-Duc. Victorian restoration of churches was widespread in England and elsewhere. It reflects a buildings continuum over time, through successive occupancies, rehabilitation emphasizes the retention and repair of historic materials, but more latitude is provided for replacement because it is assumed the property is more deteriorated prior to work. Restoration focuses on the retention of materials from the most significant time in a propertys history, reconstruction, establishes limited opportunities to re-create a non-surviving site, landscape, building, structure, or object in all new materials. Other nations recognize some or all of these as potential treatments for historic structures, canada recognizes preservation, rehabilitation, and restoration. The Burra Charter, for Australia, identifies preservation, restoration, the earliest building materials used by ancient peoples, such as wood and mud, were organic. Organic materials were used because they were plentiful and renewable, unfortunately, the organic materials used were also very susceptible to the two most significant impediments to preservation and conservation, the elements and life. Over time inorganic materials like brick, stone, metal, concrete, ancient buildings such as the Egyptian pyramids, the Roman Colosseum, and the Parthenon face common preservation issues
6.
Darning
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Darning is a sewing technique for repairing holes or worn areas in fabric or knitting using needle and thread alone. It is often done by hand, but it is possible to darn with a sewing machine. Net darning, also called filet lace, is a 19th-century technique using stitching on a foundation fabric to imitate lace. Needle weaving is a drawn thread work embroidery technique that involves darning patterns into barelaid warp or weft thread, in its simplest form, darning consists of anchoring the thread in the fabric on the edge of the hole and carrying it across the gap. It is then anchored on the side, usually with a running stitch or two. If enough threads are criss-crossed over the hole, the hole will eventually be covered with a mass of thread, fine darning, sometimes known as Belgian darning, attempts to make the repair as invisible and neat as possible. Often the hole is cut into a square or darn blends into the fabric, there are many varieties of fine darning. Simple over-and-under weaving of threads can be replaced by various fancy weaves, such as twills, chevrons, invisible darning is the epitome of this attempt at restoring the fabric to its original integrity. Threads from the original weaving are unraveled from a hem or seam, invisible darning is appropriate for extremely expensive fabrics and items of apparel. In machine darning, lines of machine running stitch are run back and forth across the hole, then the fabric is rotated and this is a fast way to darn, but it cannot match the effects of fine darning. When the repairs are finished, the egg is removed. A shell of the tiger cowry Cypraea tigris, an ornament in Europe. A darning mushroom is a tool usually made of wood. The sock is stretched over the top of the mushroom. A darning gourd is a dried gourd with a pronounced neck. The sock can be stretched over the end of the gourd. A used incandescent light bulb can be used to hold a sock in place for darning, the length of the stitches may be varied to produce geometric designs. Traditional embroidery using pattern darning is found in Africa, Japan, Northern and Eastern Europe, pattern darning is also used as a filling stitch in blackwork embroidery
7.
Medicine
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Medicine is the science and practice of the diagnosis, treatment, and prevention of disease. The word medicine is derived from Latin medicus, meaning a physician, Medicine encompasses a variety of health care practices evolved to maintain and restore health by the prevention and treatment of illness. Medicine has existed for thousands of years, during most of which it was an art frequently having connections to the religious and philosophical beliefs of local culture. For example, a man would apply herbs and say prayers for healing, or an ancient philosopher. In recent centuries, since the advent of modern science, most medicine has become a combination of art, while stitching technique for sutures is an art learned through practice, the knowledge of what happens at the cellular and molecular level in the tissues being stitched arises through science. Prescientific forms of medicine are now known as medicine and folk medicine. They remain commonly used with or instead of medicine and are thus called alternative medicine. For example, evidence on the effectiveness of acupuncture is variable and inconsistent for any condition, in contrast, treatments outside the bounds of safety and efficacy are termed quackery. Medical availability and clinical practice varies across the world due to differences in culture. In modern clinical practice, physicians personally assess patients in order to diagnose, treat, the doctor-patient relationship typically begins an interaction with an examination of the patients medical history and medical record, followed by a medical interview and a physical examination. Basic diagnostic medical devices are typically used, after examination for signs and interviewing for symptoms, the doctor may order medical tests, take a biopsy, or prescribe pharmaceutical drugs or other therapies. Differential diagnosis methods help to rule out conditions based on the information provided, during the encounter, properly informing the patient of all relevant facts is an important part of the relationship and the development of trust. The medical encounter is then documented in the record, which is a legal document in many jurisdictions. Follow-ups may be shorter but follow the general procedure. The diagnosis and treatment may take only a few minutes or a few weeks depending upon the complexity of the issue, the components of the medical interview and encounter are, Chief complaint, the reason for the current medical visit. They are in the patients own words and are recorded along with the duration of each one, also called chief concern or presenting complaint. History of present illness, the order of events of symptoms. Distinguishable from history of illness, often called past medical history
8.
NATO
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The North Atlantic Treaty Organization, also called the North Atlantic Alliance, is an intergovernmental military alliance based on the North Atlantic Treaty which was signed on 4 April 1949. The organization constitutes a system of collective defence whereby its member states agree to mutual defence in response to an attack by any external party, three NATO members are permanent members of the United Nations Security Council with the power to veto and are officially nuclear-weapon states. NATOs headquarters are located in Haren, Brussels, Belgium, while the headquarters of Allied Command Operations is near Mons. NATO is an Alliance that consists of 28 independent member countries across North America and Europe, an additional 22 countries participate in NATOs Partnership for Peace program, with 15 other countries involved in institutionalized dialogue programmes. The combined military spending of all NATO members constitutes over 70% of the global total, Members defence spending is supposed to amount to 2% of GDP. The course of the Cold War led to a rivalry with nations of the Warsaw Pact, politically, the organization sought better relations with former Warsaw Pact countries, several of which joined the alliance in 1999 and 2004. N. The Treaty of Brussels, signed on 17 March 1948 by Belgium, the Netherlands, Luxembourg, France, the treaty and the Soviet Berlin Blockade led to the creation of the Western European Unions Defence Organization in September 1948. However, participation of the United States was thought necessary both to counter the power of the USSR and to prevent the revival of nationalist militarism. He got a hearing, especially considering American anxiety over Italy. In 1948 European leaders met with U. S. defense, military and diplomatic officials at the Pentagon, marshalls orders, exploring a framework for a new and unprecedented association. Talks for a new military alliance resulted in the North Atlantic Treaty and it included the five Treaty of Brussels states plus the United States, Canada, Portugal, Italy, Norway, Denmark and Iceland. The first NATO Secretary General, Lord Ismay, stated in 1949 that the goal was to keep the Russians out, the Americans in. Popular support for the Treaty was not unanimous, and some Icelanders participated in a pro-neutrality, the creation of NATO can be seen as the primary institutional consequence of a school of thought called Atlanticism which stressed the importance of trans-Atlantic cooperation. The members agreed that an attack against any one of them in Europe or North America would be considered an attack against them all. The treaty does not require members to respond with military action against an aggressor, although obliged to respond, they maintain the freedom to choose the method by which they do so. This differs from Article IV of the Treaty of Brussels, which states that the response will be military in nature. It is nonetheless assumed that NATO members will aid the attacked member militarily, the treaty was later clarified to include both the members territory and their vessels, forces or aircraft above the Tropic of Cancer, including some Overseas departments of France. The creation of NATO brought about some standardization of allied military terminology, procedures, and technology, the roughly 1300 Standardization Agreements codified many of the common practices that NATO has achieved
9.
Product lifecycle
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PLM integrates people, data, processes and business systems and provides a product information backbone for companies and their extended enterprise. The inspiration for the business process now known as PLM came from American Motors Corporation. Lacking the massive budgets of General Motors, Ford, and foreign competitors … AMC placed R&D emphasis on bolstering the product cycle of its prime products. After introducing its compact Jeep Cherokee, the vehicle that launched the sport utility vehicle market, AMC began development of a new model. The first part in its quest for faster product development was computer-aided design software system that make engineers more productive. While an early adopter of PLM technology, Chrysler was able to become the auto industrys lowest-cost producer, during 1982-83, Rockwell International developed initial concepts of PDM and PLM for the B-1B bomber program. The system called Engineering Data System was augmented to interface with Computervision and CADAM systems to track part configurations and lifecycle of components, computervison later released implementing only the PDM aspects as the lifecycle model was specific to Rockwell and aerospace needs. PLM systems help organizations in coping with the complexity and engineering challenges of developing new products for the global competitive markets. Product lifecycle management should be distinguished from product life-cycle management, Product lifecycle management can be considered one of the four cornerstones of a manufacturing corporations information technology structure. All companies need to manage communications and information with their customers, their suppliers and fulfillment, their resources within the enterprise and their product planning, one form of PLM is called people-centric PLM. While traditional PLM tools have been deployed only on release or during the release phase and this has resulted in the extension of PLM into closed-loop lifecycle management. Systems engineering is focused on meeting all requirements, primarily meeting customer needs, an important aspect for life cycle management is a subset within Systems Engineering called Reliability Engineering. Product and portfolio management is focused on managing resource allocation, tracking progress vs. plan for new development projects that are in process. Manufacturing process management is a collection of technologies and methods used to define how products are to be manufactured, Product data management is focused on capturing and maintaining information on products and/or services through their development and useful life. Change management is an important part of PDM/PLM, the core of PLM is in the creation and central management of all product data and the technology used to access this information and knowledge. PLM as a discipline emerged from such as CAD, CAM and PDM, but can be viewed as the integration of these tools with methods, people. It is not just about technology but is also a business strategy. For simplicity the stages described are shown in a traditional sequential engineering workflow, design is an iterative process, often designs need to be modified due to manufacturing constraints or conflicting requirements
10.
International Civil Aviation Organization
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The International Civil Aviation Organization, is a specialized agency of the United Nations. It codifies the principles and techniques of international air navigation and fosters the planning and development of air transport to ensure safe. Its headquarters are located in the Quartier International of Montreal, Quebec, ICAO defines the protocols for air accident investigation followed by transport safety authorities in countries signatory to the Convention on International Civil Aviation. The Air Navigation Commission is the body within ICAO. The Commission is composed of 19 Commissioners, nominated by the ICAOs contracting states, Commissioners serve as independent experts, who although nominated by their states, do not serve as state or political representatives. The development of Aviation Standards and Recommended Practices is done under the direction of the ANC through the process of ICAO Panels. Once approved by the Commission, standards are sent to the Council, the forerunner to ICAO was the International Commission for Air Navigation. It held its first convention in 1903 in Berlin, Germany, at the second convention in 1906, also held in Berlin,27 countries attended. The third convention, held in London in 1912 allocated the first radio callsigns for use by aircraft, ICAN continued to operate until 1945. Fifty-two countries signed the Convention on International Civil Aviation, also known as the Chicago Convention, in Chicago, Illinois, on 7 December 1944. Under its terms, a Provisional International Civil Aviation Organization was to be established, accordingly, PICAO began operating on 6 June 1945, replacing ICAN. The 26th country ratified the Convention on 5 March 1947 and, consequently PICAO was disestablished on 4 April 1947 and replaced by ICAO, in October 1947, ICAO became an agency of the United Nations linked to the United Nations Economic and Social Council. In April 2013 Qatar offered to serve as the new permanent seat of the Organization, according to the Globe and Mail, Qatars move was at least partly motivated by the pro-Israel foreign policy of Canadian Prime Minister Stephen Harper. Approximately one month later, Qatar withdrew its bid after a proposal to the ICAOs governing council to move the ICAO triennial conference to Doha was defeated by a vote of 22–14. The 9th edition of the Convention on International Civil Aviation includes modifications from 1948 up to year 2006, ICAO refers to its current edition of the Convention as the Statute, and designates it as ICAO Document 7300/9. The Convention has 19 Annexes that are listed by title in the article Convention on International Civil Aviation, as of March 2016, there are 191 ICAO members, consisting of 190 of the 193 UN members, plus the Cook Islands. Liechtenstein has delegated Switzerland to implement the treaty to make it applicable in the territory of Liechtenstein, Taiwan attended the 38th Session of the ICAO Assembly in 2013, but in 2016 was denied such an invitation, despite expressions of support from the United States for Taiwan to participate. However, the Republic of China under the name of Chinese Taipei is a member of International Air Transport Association, the Council of ICAO is elected by the Assembly every 3 years and consists of 36 members elected in 3 categories
