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1808 In Science
The year 1808 in science and technology involved some significant events, listed below. Astronomy * December 9 (20:34 UTC) – Mercury occults Saturn (not known at this time). Chemistry * Barium, calcium, magnesium, and strontium isolated by Humphry Davy. * Joseph Louis Gay-Lussac formulates the law of combining volumes for gases. * John Dalton begins publication of ''A New System of Chemical Philosophy'', explaining his atomic theory of chemistry and including a list of atomic weights. * Jöns Jakob Berzelius publishes ''Lärbok i Kemien'' in which he proposes modern chemical symbols and notation, and of the concept of relative atomic weight. Mathematics * French mathematician Christian Kramp introduces the notation ''n''! in factorials. * German mathematician Carl Friedrich Gauss publishes ''Theorematis arithmetici demonstratio nova'', introducing Gauss's lemma in the third proof of quadratic reciprocity. * Irish American mathematician Robert Adrain produces a formulati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Christian Kramp
Christian Kramp (8 July 1760 – 13 May 1826) was a French mathematician, who worked primarily with factorials. Christian Kramp's father was his teacher at grammar school in Strasbourg. Kramp studied medicine and graduated; however, his interests certainly ranged outside medicine, for in addition to a number of medical publications he published a work on crystallography in 1793. In 1795, France annexed the Rhineland area in which Kramp was carrying out his work and after this he became a teacher at Cologne (this city was French from 1794 to 1815), teaching mathematics, chemistry, and physics. Kramp could read and write in German and French. Kramp was appointed professor of mathematics at Strasbourg, the town of his birth, in 1809. He was elected to the geometry section of the French Academy of Sciences in 1817. As Bessel, Legendre and Gauss did, Kramp worked on the generalised factorial function which applied to non-integers. His work on factorials is independent of that of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anthracite
Anthracite, also known as hard coal and black coal, is a hard, compact variety of coal that has a lustre (mineralogy)#Submetallic lustre, submetallic lustre. It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest Coal analysis#Coal classification by rank, ranking of coals. The Coal Region of Northeastern Pennsylvania in the United States has the largest known deposits of anthracite coal in the world with an estimated reserve of seven billion short ton, short tons. Coal in China, China accounts for the majority of global production; other producers include Coal in Russia, Russia, Coal in Ukraine, Ukraine, Coal in North Korea, North Korea, Coal in South Africa, South Africa, Coal in Vietnam, Vietnam, Coal in Australia, Australia, Coal in Canada, Canada, and the Coal mining in the United States, United States. Total production in 2020 was 615 million tons. Anthracite is the most metamorphism, metamorphosed ty ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexander Von Humboldt
Friedrich Wilhelm Heinrich Alexander von Humboldt (14 September 1769 – 6 May 1859) was a German polymath, geographer, natural history, naturalist, List of explorers, explorer, and proponent of Romanticism, Romantic philosophy and Romanticism in science, science. He was the younger brother of the Prussian minister, philosopher, and linguistics, linguist Wilhelm von Humboldt (1767–1835). Humboldt's quantitative work on botany, botanical geography laid the foundation for the field of biogeography, while his advocacy of long-term systematic geophysical measurement pioneered modern Earth's magnetic field, geomagnetic and meteorology, meteorological monitoring. Humboldt and Carl Ritter are both regarded as the founders of modern geography as they established it as an independent scientific discipline. Between 1799 and 1804, Humboldt travelled extensively in the Americas, exploring and describing them for the first time from a non-Spanish European scientific point of view. His des ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edinburgh
Edinburgh is the capital city of Scotland and one of its 32 Council areas of Scotland, council areas. The city is located in southeast Scotland and is bounded to the north by the Firth of Forth and to the south by the Pentland Hills. Edinburgh had a population of in , making it the List of towns and cities in Scotland by population, second-most populous city in Scotland and the List of cities in the United Kingdom, seventh-most populous in the United Kingdom. The Functional urban area, wider metropolitan area had a population of 912,490 in the same year. Recognised as the capital of Scotland since at least the 15th century, Edinburgh is the seat of the Scottish Government, the Scottish Parliament, the Courts of Scotland, highest courts in Scotland, and the Palace of Holyroodhouse, the official residence of the Monarchy of the United Kingdom, British monarch in Scotland. It is also the annual venue of the General Assembly of the Church of Scotland. The city has long been a cent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wernerian Natural History Society
The Wernerian Natural History Society (12 January 1808 – 16 April 1858), commonly abbreviated as the Wernerian Society, was a learned society interested in the broad field of natural history, and saw papers presented on various topics such as mineralogy, plants, insects, and scholarly expeditions. The Society was an offshoot of the Royal Society of Edinburgh, and from its beginnings it was a rather elite organization. The Society was named after Abraham Gottlob Werner, a German geologist who was a creator of Neptunism, a theory of superposition based on a receding primordial ocean that had deposited all the rocks in the crust.Scholarly Societies Project , Wernerian Natural History Society. At this time all rocks, including |
Johann Christian Reil
Johann Christian Reil (20 February 1759 – 22 November 1813) was a German physician, physiologist, anatomist, and psychiatrist. He coined the term psychiatry – ''Psychiatrie'' in German – in 1808. Reil was one of five children, and was the son of a Lutheran pastor in Northwest Germany. He married Johanna Wilhelmine Leveaux in October, 1788. Together they had two sons and four daughters. Medical conditions and anatomical features named after him include Reil's finger (later called ''digitus mortuus'' or Raynaud syndrome) and the Islands of Reil in the cerebral cortex. In 1809, he was the first to describe the white fibre tract now called the arcuate fasciculus.Catani M, Mesulam M. (2008). The arcuate fasciculus and the disconnection theme in language and aphasia: history and current state. Cortex. 44(8):953-61. He is frequently and erroneously credited with discovering the locus coeruleus,Maeda T. (2000). The Locus coeruleus: history. Journal of Chemical Neuroanatomy. 18 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Psychiatry
Psychiatry is the medical specialty devoted to the diagnosis, treatment, and prevention of deleterious mental disorder, mental conditions. These include matters related to cognition, perceptions, Mood (psychology), mood, emotion, and behavior. Initial psychiatric assessment of a person begins with creating a Medical history, case history and conducting a mental status examination. Laboratory tests, physical examinations, and psychological tests may be conducted. On occasion, neuroimaging or neurophysiological studies are performed. Mental disorders are diagnosed in accordance with diagnostic manuals such as the ''International Classification of Diseases'' (ICD), edited by the World Health Organization (WHO), and the ''Diagnostic and Statistical Manual of Mental Disorders'' (DSM), published by the American Psychiatric Association (APA). The fifth edition of the DSM (DSM-5) was published in May 2013. Treatment may include psychotropics (psychiatric medicines), psychotherapy, su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Least Squares
The method of least squares is a mathematical optimization technique that aims to determine the best fit function by minimizing the sum of the squares of the differences between the observed values and the predicted values of the model. The method is widely used in areas such as regression analysis, curve fitting and data modeling. The least squares method can be categorized into linear and nonlinear forms, depending on the relationship between the model parameters and the observed data. The method was first proposed by Adrien-Marie Legendre in 1805 and further developed by Carl Friedrich Gauss. History Founding The method of least squares grew out of the fields of astronomy and geodesy, as scientists and mathematicians sought to provide solutions to the challenges of navigating the Earth's oceans during the Age of Discovery. The accurate description of the behavior of celestial bodies was the key to enabling ships to sail in open seas, where sailors could no longer rely on la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert Adrain
Robert Adrain (30 September 1775 – 10 August 1843) was an Irish political exile who won renown as a mathematician in the United States. He left Ireland after leading republican insurgents in the Rebellion of 1798, and settled in New Jersey and Pennsylvania. With Nathaniel Bowditch, he shares the distinction of being the first scholar to publish original mathematical research in America. This included his formulation of the method of least squares while working on a surveying problem (in two proofs of the exponential law of error published independently of Carl Friedrich Gauss) for which he is chiefly remembered. His fields of applied mathematical interest included physics, astronomy and geodesy. Many of his mathematical investigations focussed on the shape of the Earth. Biography Adrain was born in Carrickfergus, County Antrim, Ireland. His father, of French Huguenot descent, was a school teacher and maker of mathematical instruments, and he apparently received a good educ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Irish American
Irish Americans () are Irish ethnics who live within in the United States, whether immigrants from Ireland or Americans with full or partial Irish ancestry. Irish immigration to the United States From the 17th century to the mid-19th century Some of the first Irish people to travel to the New World did so as members of the Spanish colonization of the Americas, Spanish garrison in Spanish Florida, Florida during the 1560s. Small numbers of Irish colonists were involved in efforts to establish colonies in the Amazon basin, Amazon region, in Newfoundland, and in Virginia between 1604 and the 1630s. According to historian Donald Akenson, there were "few if any" Irish forcibly transported to the Americas during this period. Irish immigration to the Americas was the result of a series of complex causes. The Tudor conquest of Ireland, Tudor conquest and Plantations of Ireland, subsequent colonization by English and Scots people during the 16th and 17th centuries had led ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quadratic Reciprocity
In number theory, the law of quadratic reciprocity is a theorem about modular arithmetic that gives conditions for the solvability of quadratic equations modulo prime numbers. Due to its subtlety, it has many formulations, but the most standard statement is: This law, together with its supplements, allows the easy calculation of any Legendre symbol, making it possible to determine whether there is an integer solution for any quadratic equation of the form x^2\equiv a \bmod p for an odd prime p; that is, to determine the "perfect squares" modulo p. However, this is a non-constructive result: it gives no help at all for finding a ''specific'' solution; for this, other methods are required. For example, in the case p\equiv 3 \bmod 4 using Euler's criterion one can give an explicit formula for the "square roots" modulo p of a quadratic residue a, namely, :\pm a^ indeed, :\left (\pm a^ \right )^2=a^=a\cdot a^\equiv a\left(\frac\right)=a \bmod p. This formula only works if it is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
