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HandWiki is the world's largest wiki-style encyclopedia dedicated to science, technology and computing. It allows you to create and edit articles as long as you have external citations and login account. In addition, this is a content management environment that can be used for collaborative editing of original scholarly content, such as books, manuals, monographs and tutorials.

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Breguet 14
The Breguet 14 was a French biplane bomber and reconnaissance aircraft of the First World War. It was built in very large numbers and production continued for many years after the end of the war. Apart from its widespread usage, the Breguet 14 is known for being the first mass-produced aircraft to use large amounts of metal, rather than wood, in its structure. This allowed the airframe to be lighter than a wooden airframe of the same strength, in turn making the aircraft relatively fast and agile for its size; in combat situations, it was able to outrun many of the contemporary fighters of the day. The Breguet 14's strong construction allowed it to sustain considerable damage, in addition to being easy to handle and possessing favourable performance. The type has often been considered to have been one of the best aircraft of the war.
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  • 14 Nov 2022
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Law of Social Cycle
The law of social cycle is a social cycle theory developed by Prabhat Ranjan Sarkar. It is based on the theory of human historical motivity based on "the ancient spiritual ideas of the Vedas". The theory was developed in the 1950s and expanded by Ravi Batra since the 1970s, Johan Galtung and Sohail Inayatullah since the 1990s and others.
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  • 14 Nov 2022
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History of Industrialisation
This article delineates the history of industrialisation.
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  • 14 Nov 2022
Topic Review
Andrew Jackson Presidential Campaign, 1828
In 1828, Andrew Jackson, who had lost the 1824 election in a runoff in the United States House of Representatives, despite winning both the popular vote and the Electoral vote by significant margins, ran for President of the United States. He had been nominated by the Tennessee state legislature in 1825, and did not face any opposition from Democratic candidates. Jackson launched his campaign on January 8, 1828 with a major speech on the 13th anniversary of the Battle of New Orleans from 1815, thus marking the birth of the modern Democratic Party. Jackson accepted John C. Calhoun, incumbent Vice President under John Quincy Adams, as his running mate. John Quincy Adams was an unpopular President from the beginning of his term, and the Democratic Party, which was just beginning to emerge as a political force, mobilized behind Jackson, a popular war hero who had served in the Battle of New Orleans. Despite his successes as a member of both the House of Representatives and the Senate, as well as the Military Governor of Florida, Jackson had been born in relatively modest surroundings in rural Carolina, which appealed to the majority of Americans, who were small farmers who benefited from the introduction of Universal male suffrage from the 1820s to the 1840s. This expansion of voting rights helped both major political parties (the Democrats and the National Republicans) canvass voters and expand the popular vote. The campaign was marked by large amounts of nasty "mudslinging." Jackson's marriage, for example, came in for vicious attack. When Jackson married his wife Rachel in 1791, the couple believed that she was divorced, however the divorce was not yet finalized, so he had to remarry her once the legal papers were complete. In the Adams campaign's hands, this became a scandal. Charles Hammond, in his Cincinnati Gazette, asked: "Ought a convicted adulteress and her paramour husband be placed in the highest offices of this free and Christian land?" Jackson also came under heavy attack as a slave trader who bought and sold slaves and moved them about in defiance of modern standards or morality. (He was not attacked for merely owning slaves used in plantation work.) The Coffin Handbills attacked Jackson for his courts-martial, execution of deserters and massacres of Indian villages, and also his habit of dueling.
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  • 14 Nov 2022
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Complementarity
In physics, complementarity is a conceptual aspect of quantum mechanics that Niels Bohr regarded as an essential feature of the theory. The complementarity principle holds that objects have certain pairs of complementary properties which cannot all be observed or measured simultaneously. An example of such a pair is position and momentum. Bohr considered one of the foundational truths of quantum mechanics to be the fact that setting up an experiment to measure one quantity of a pair, for instance the position of an electron, excludes the possibility of measuring the other, yet understanding both experiments is necessary to characterize the object under study. In Bohr's view, the behavior of atomic and subatomic objects cannot be separated from the measuring instruments that create the context in which the measured objects behave. Consequently, there is no "single picture" that unifies the results obtained in these different experimental contexts, and only the "totality of the phenomena" together can provide a completely informative description.
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  • 14 Nov 2022
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DNA Barcoding
DNA barcoding is a method of species identification using a short section of DNA from a specific gene or genes. The premise of DNA barcoding is that, by comparison with a reference library of such DNA sections (also called "sequences"), an individual sequence can be used to uniquely identify an organism to species, in the same way that a supermarket scanner uses the familiar black stripes of the UPC barcode to identify an item in its stock against its reference database. These "barcodes" are sometimes used in an effort to identify unknown species, parts of an organism, or simply to catalog as many taxa as possible, or to compare with traditional taxonomy in an effort to determine species boundaries. Different gene regions are used to identify the different organismal groups using barcoding. The most commonly used barcode region for animals and some protists is a portion of the cytochrome c oxidase I (COI or COX1) gene, found in mitochondrial DNA. Other genes suitable for DNA barcoding are the internal transcribed spacer (ITS) rRNA often used for fungi and RuBisCO used for plants. Microorganisms are detected using different gene regions. The 16S rRNA gene for example is widely used in identification of prokaryotes, whereas the 18S rRNA gene is mostly used for detecting microbial eukaryotes. These gene regions are chosen because they have less intraspecific (within species) variation than interspecific (between species) variation, which is known as the "Barcoding Gap". Some applications of DNA barcoding include: identifying plant leaves even when flowers or fruits are not available; identifying pollen collected on the bodies of pollinating animals; identifying insect larvae which may have fewer diagnostic characters than adults; or investigating the diet of an animal based on its stomach content, saliva or feces. When barcoding is used to identify organisms from a sample containing DNA from more than one organism, the term DNA metabarcoding is used, e.g. DNA metabarcoding of diatom communities in rivers and streams, which is used to assess water quality.
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  • 16 Nov 2022
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Allegiance
An allegiance is a duty of fidelity said to be owed, or freely committed, by the people, subjects or citizens to their state or sovereign.
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  • 14 Nov 2022
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Climate State
Climate state describes a state of climate on Earth and similar terrestrial planets based on a thermal energy budget, such as the greenhouse or icehouse climate state. The main climate state change is between periodical glacial and interglacial cycles in Earth history, studied from climate proxies. The climate system is responding to the current climate forcing and adjusts following climate sensitivity to reach a climate equilibrium, Earth's energy balance. Model simulations suggest that the current interglacial climate state will continue for at least another 100,000 years, due to CO2 emissions - including complete deglaciation of the Northern Hemisphere.
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  • 16 Nov 2022
Topic Review
Emissions Budget
An emissions budget, carbon budget, emissions quota, or allowable emissions, is an upper limit of total carbon dioxide (CO2) emissions associated with remaining below a specific global average temperature. An emissions budget may also be associated with objectives for other related climate variables, such as radiative forcing. Global emissions budgets are calculated according to historical cumulative emissions from fossil fuel combustion, industrial processes, and land-use change, but vary according to the global temperature target that is chosen, the probability of staying below that target, and the emission of other non-CO2 greenhouse gases (GHGs). Global emissions budgets can be further divided into national emissions budgets, so that countries can set specific climate mitigation goals. Emissions budgets are relevant to climate change mitigation because they indicate a finite amount of carbon dioxide that can be emitted over time, before resulting in dangerous levels of global warming. Change in global temperature is independent from the geographic location of these emissions, and is largely independent of the timing of these emissions. In line with the 2018 Special report on Global Warming of 1.5° C by the IPCC, the Mercator Research Institute on Global Commons and Climate Change estimates that the CO2 budget associated with 1.5 °C degrees of warming will be exhausted in 2028 if emissions remain on the current level of the late 2010s. Beyond a 1.5°C temperature rise, the risk of long-lasting and irreversible consequences of climate change increases. An emissions budget may be distinguished from an emissions target, as an emissions target may be internationally or nationally set in accordance with objectives other than a specific global temperature. This includes targets created for their political palatability, rather than ones focused on climate science warnings.
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  • 14 Nov 2022
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Hinode
Hinode (/ˈhiːnoʊdeɪ/; Japanese: ひので, IPA: [çinode], Sunrise), formerly Solar-B, is a Japan Aerospace Exploration Agency Solar mission with United States and United Kingdom collaboration. It is the follow-up to the Yohkoh (Solar-A) mission and it was launched on the final flight of the M-V-7 rocket from Uchinoura Space Center, Japan on 22 September 2006 at 21:36 UTC (23 September, 06:36 JST). Initial orbit was perigee height 280 km, apogee height 686 km, inclination 98.3 degrees. Then the satellite maneuvered to the quasi-circular sun-synchronous orbit over the day/night terminator, which allows near-continuous observation of the Sun. On 28 October 2006, the probe's instruments captured their first images. The data from Hinode are being downloaded to the Norway , terrestrial Svalsat station, operated by Kongsberg a few kilometres west of Longyearbyen, Svalbard. From there, data was transmitted by Telenor through a fibre-optic network to mainland Norway at Harstad, and on to data users in North America, Europe and Japan.
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