موسوعة العلمـاء و المخترعين .. العلمـاء بالترتيب حسب اسم الشهرة .. الحرف ٤_د

Encyclopedia of Scientists and Inventors.. Scientists in order according to their nickname.. The letter 4_d

⏹ Dirac, Paul Adrien Morris
Dirac, Paul Adrian Maurice

English physicist (1902),
Dirac was educated at Cambridge and then worked as a mathematics teacher there in 1932. He was elected a member of the Royal Society. Dirac hypothesized the existence of the positron in 1930, which was discovered two years later in 1932 by Anderson Blackett.
Dirac was awarded the Nobel Prize for Physics in 1933 jointly with Schrodinger for his research on quantum mechanics. Dirac contributed to the development of the spinning theory of the electron. He has a famous author entitled: Principles of Quantum Mechanics, which he published in 1930.

⏹ Dizayeh, Gerard Paul
Deshayes, Gerard Paul

French geologist (1795 - 1875)
Desailly studied medicine in Strasbourg and Paris, then devoted himself to studying zoology and shellfish science, so he worked as a professor of this science in Paris.
Desailly researched the fossils (fossils or fossils) of the Paris Basin, and he formed a group of forty thousand samples.

⏹ Davis, William Morse
Davis, William Morris

Geomorphologist (land topography and distribution of water and land) American (1850-1935).
Davis learned at Harvard and then held a number of scientific positions until he received the position of professor of geology at Harvard. For the erosion cycle, Davis also studied drainage problems in the Pennsylvania and New Jersey regions.

⏹ Dieffenbach Johann Friedrich
Dieffenbach Johann Friedrich

German surgeon (1794 - 1847) ·
Dieffenbach learned in Bonn and Paris, then worked in Berlin. He became famous as a plastic surgeon. His methods of forming new noses, eyelids and lips were a great progress in this field (compare with Tagliacozzi 1546-1599). Dieffenbach has succeeded to a large extent in the treatment of strabismus and stuttering.

⏹ Davy John, John

English physician (1790 - 1868)
Davy learned medicine in Edinburgh and was able to industrially prepare polina (yorba) by the action of ammonium gas, on what he called phosgene (carbonyl chloride), but he did not notice the formation of polina in this reaction. It is worth mentioning that John Davy is the brother of the famous chemist Humphrey Davy.

⏹ Davy, Sir Humphrey
Davy, Humphry Sir

English chemist (1778 - 1829)
Davy wanted to study medicine and chemical pharmacy
He conducted experiments on the narcotic effect of nitrogen oxides on the body, and he also conducted experiments on breathing that led to harm to his health. He worked at the Royal Philosophical Institute. · He succeeded in isolating the alkali elements. He has extensive and very important chemical research and discoveries, including the electrical nature of chemical affinity and research on chlorine.
He invented a safety lamp known by his name. Pioneering experiments in photography using silver nitrate, but they were not completed. Davy for a period was an assistant to Faraday and met Amper and Gay-Lussac, where a kind of enmity arose between them. In general, Davy is one of the most prominent chemists of his time. He is the brother of the famous physician John Davy.

⏹ Deville, Henri-Etienne Steet-Claire
Deville Henri Claire Etienne Ste

French chemist (1818 - 1881)
Deville learned chemistry in Paris at the hands of Tannar Thenard • Then he worked in teaching chemistry. Deville worked on technical methods to produce there metals and reached an advanced thermal method for preparing pure aluminum. Deville discovered “toluene” (toluene) in the year 1841 (it should be noted here that Petlletier And Walter, we were able to prepare toluene in the year 1836 by distilling the pipe resin. Deville also discovered “the fifth of nitrogen oxide.” In addition to that, he studied the anhydrous thermal dissociation and participated with some of those working on platinum using a mullet flame consisting of oxygen and hydrogen.