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Electron Microscope
An electron microscope is a microscope that uses a beam of electrons as a source of illumination. They use electron optics that are analogous to the glass lenses of an optical light microscope. As the wavelength of an electron can be up to 100,000 times shorter than that of visible light, electron microscopes have a higher resolution of about 0.1 nm, which compares to about 200 nm for light microscopes. ''Electron microscope'' may refer to: *Transmission electron microscopy (TEM) where swift electrons go through a thin sample *Scanning transmission electron microscopy (STEM) is similar to TEM with a scanned electron probe * Scanning electron microscope (SEM) is similar the STEM, but with thick samples * Electron microprobe similar to a SEM, but more for chemical analysis * Ultrafast scanning electron microscopy, version of SEM that can operate very fast *Low-energy electron microscopy (LEEM), used to image surfaces * Photoemission electron microscopy (PEEM) is similar to LEEM usi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electron Microscope
An electron microscope is a microscope that uses a beam of accelerated electrons as a source of illumination. As the wavelength of an electron can be up to 100,000 times shorter than that of visible light photons, electron microscopes have a higher resolving power than light microscopes and can reveal the structure of smaller objects. A scanning transmission electron microscope has achieved better than 50 pm resolution in annular dark-field imaging mode and magnifications of up to about 10,000,000× whereas most light microscopes are limited by diffraction to about 200 nm resolution and useful magnifications below 2000×. Electron microscopes use shaped magnetic fields to form electron optical lens systems that are analogous to the glass lenses of an optical light microscope. Electron microscopes are used to investigate the ultrastructure of a wide range of biological and inorganic specimens including microorganisms, cells, large molecules, biopsy samples, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthur Wehnelt
Arthur Rudolph Berthold Wehnelt (April 4, 1871 – February 15, 1944) was a German physicist, noted for important contributions in the fields of X-ray physics, gas discharges and electron emission. Life Wehnelt's parents returned to Germany from Brazil when he was still a boy. He studied physics at the Technische Hochschule Charlottenburg, and from 1893 to 1897 at the Friedrich-Wilhelms University in Berlin. He received his PhD in 1898 in Erlangen. He taught as a lecturer from 1901 and associate professor of physics from 1904 at the Friedrich-Alexander University Erlangen-Nuremberg. He moved again in 1906 to the University of Berlin, where he taught until his retirement in 1937 as a professor and research. In 1934 he was appointed director of the Physics Department. Work In 1899, he invented the Wehnelt interrupter for induction coils. This device used a platinum electrode immersed in electrolyte. When current was passed through it the gas bubbles evolved caused repeated i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manfred Von Ardenne
Manfred von Ardenne (20 January 1907 – 26 May 1997) was a German researcher and applied physicist and inventor. He took out approximately 600 patents in fields including electron microscopy, medical technology, nuclear technology, plasma physics, and radio and television technology. From 1928 to 1945, he directed his private research laboratory ''Forschungslaboratorium für Elektronenphysik''. For ten years after World War II, he worked in the Soviet Union on their atomic bomb project and was awarded a Stalin Prize. Upon his return to the then East Germany, he started another private laboratory, ''Forschungsinstitut Manfred von Ardenne''. Career Early years The stormy life of von Ardenne's grandmother, Elisabeth von Ardenne (1853–1952), is said to have been be the inspiration for ''Effi Briest'' by Theodor Fontane, one of the most famous German realist novels. Born in 1907 in Hamburg to a wealthy aristocratic family, Ardenne was the oldest of five children. In 1913, Ard ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helmut Ruska
Helmut Ruska (June 7, 1908, Heidelberg - August 30, 1973) was a German physician and biologist from Heidelberg. After earning his medical degree, he spent several years working as a physician at hospitals in Heidelberg and Berlin. During this time, he also worked closely with his brother Ernst Ruska (1906-1988) and brother-in-law Bodo von Borries (1905-56), who were both research scientists at Siemens-Reiniger-Werke. Ernst Ruska was the inventor of the electron microscope, and later winner of a Nobel Prize. From 1948 to 1951, Helmut Ruska was a professor at the University of Berlin, in 1952 he moved to the United States where he was a micromorphologist for the New York State Department of Health in Albany. He returned to Germany in 1958 as director of biophysics at the University of Düsseldorf. Through close association with his brother, Helmut Ruska is remembered for developing the electron microscope for biological and medical applications. He was the first scientist to study " ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bodo Von Borries
Bodo von Borries (born 22 May 1905 in Herford, North Rhine-Westphalia, Germany — died 17 July 1956 in Aachen, North Rhine-Westphalia) was a German physicist. He was the co-inventor of the electron microscope. Von Borries studied electrical engineering at the Technical University of Danzig, and at Berlin Institute of Technology, where he was awarded a PhD in 1932. Von Borries worked at RWE from 1934 to 1937. In 1937 he commenced work on electron microscopy with Ernst Ruska at Siemens & Halske AG in Berlin. In 1937 von Borries 1937 married Hedwig Ruska, Ernst Ruska's sister. After World War II , he founded the "Rhine-Westphalia Institute for Electron Microscopy" in Düsseldorf in 1948. In 1949, he was involved in the foundation of the German Society for Electron Microscopy. In 1953 he became a full professor at the Technical University of Aachen RWTH Aachen University (), also known as North Rhine-Westphalia Technical University of Aachen, Rhine-Westphalia Technical Uni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reinhold Rudenberg
Reinhold Rudenberg (or Rüdenberg; February 4, 1883 – December 25, 1961) was a German-American electrical engineer and inventor, credited with many innovations in the electric power and related fields. Aside from improvements in electric power equipment, especially large alternating current generators, among others were the electrostatic-lens electron microscope, carrier-current communications on power lines, a form of phased array radar, an explanation of power blackouts, preferred number series, and the number prefix " Giga-". Early life and education Reinhold Rudenberg was born in Hannover to a family of Jewish descent. His father Georg was a manufacturer, who operated a plant for preparing, cleaning feathers and down goods. His mother was a daughter of the Chief Rabbi of the county of Braunschweig. He attended the Leibniz University Hannover (then Technische Hochschule), and after receiving his electrical engineering degrees (Dipl. Ing.) and doctorate (Dr. Ing.), both in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siemens-Schuckertwerke
Siemens-Schuckert (or Siemens-Schuckertwerke) was a German electrical engineering company headquartered in Berlin, Erlangen and Nuremberg that was incorporated into the Siemens AG in 1966. Siemens Schuckert was founded in 1903 when Siemens & Halske acquired Schuckertwerke. Subsequently, Siemens & Halske specialized in communications engineering and Siemens-Schuckert in power engineering and pneumatic instrumentation. During World War I Siemens-Schuckert also produced aircraft. It took over manufacturing of the renowned Protos vehicles in 1908. In World War II, the company had a factory producing aircraft and other parts at Monowitz near Auschwitz. There was a workers camp near the factory known as Bobrek concentration camp. The Siemens Schuckert logo consisted of an S with a smaller S superimposed on the middle with the smaller S rotated left by 45 degrees.Siemens used this as a theme for their logos with absorbed companies: Siemens & Halske's logo was a large S with a small sup ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nobel Prize
The Nobel Prizes ( ; sv, Nobelpriset ; no, Nobelprisen ) are five separate prizes that, according to Alfred Nobel's will of 1895, are awarded to "those who, during the preceding year, have conferred the greatest benefit to humankind." Alfred Nobel was a Swedish chemist, engineer, and industrialist most famously known for the invention of dynamite. He died in 1896. In his will, he bequeathed all of his "remaining realisable assets" to be used to establish five prizes which became known as "Nobel Prizes." Nobel Prizes were first awarded in 1901. Nobel Prizes are awarded in the fields of Physics, Chemistry, Physiology or Medicine, Literature, and Peace (Nobel characterized the Peace Prize as "to the person who has done the most or best to advance fellowship among nations, the abolition or reduction of standing armies, and the establishment and promotion of peace congresses"). In 1968, Sveriges Riksbank (Sweden's central bank) funded the establishment of the Prize in Economi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ernst Ruska
Ernst August Friedrich Ruska (; 25 December 1906 – 27 May 1988) was a German physicist who won the Nobel Prize in Physics in 1986 for his work in electron optics, including the design of the first electron microscope. Life and career Ernst Ruska was born in Heidelberg, Germany. He was educated at the Technical University of Munich from 1925 to 1927 and then entered the Technical University of Berlin, where he posited that microscopes using electrons, with wavelengths 1000 times shorter than those of light, could provide a more detailed picture of an object than a microscope utilizing light, in which magnification is limited by the size of the wavelengths. In 1931, he demonstrated that a magnetic coil could act as an electron lens, and used several coils in a series to build the first electron microscope in 1933. After completing his PhD in 1933, Ruska continued to work in the field of electron optics, first at Fernseh AG in Berlin-Zehlendorf, and then from 1937 at Siemens ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Max Knoll
Max Knoll (17 July 1897 – 6 November 1969) was a German electrical engineer. Knoll was born in Wiesbaden and studied in Munich and at the Technical University of Berlin, where he obtained his doctorate A doctorate (from Latin ''docere'', "to teach"), doctor's degree (from Latin ''doctor'', "teacher"), or doctoral degree is an academic degree awarded by universities and some other educational institutions, derived from the ancient formalism ''l ... in the Institute for High Voltage Technology. In 1927 he became the leader of the electron research group there, where he and his co-worker, Ernst Ruska, invented the electron microscope in 1931. In April 1932, Knoll joined Telefunken in Berlin to do developmental work in the field of television design. He was also a private lecturer in Berlin. After World War II, Knoll joined the University of Munich as extraordinary professor and director of the Institute for Electromedicine. He moved to the United States, USA in 1948, to wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Technical University Of Berlin
The Technical University of Berlin (official name both in English and german: link=no, Technische Universität Berlin, also known as TU Berlin and Berlin Institute of Technology) is a public research university located in Berlin, Germany. It was the first German university to adopt the name "Technische Universität" (Technical University). The university alumni and professor list includes several US National Academies members, two National Medal of Science laureates and ten Nobel Prize laureates. TU Berlin is a member of TU9, an incorporated society of the largest and most notable German institutes of technology and of the Top International Managers in Engineering network, which allows for student exchanges between leading engineering schools. It belongs to the Conference of European Schools for Advanced Engineering Education and Research. The TU Berlin is home of two innovation centers designated by the European Institute of Innovation and Technology. The university is labeled ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
