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Hendrik Van Der Bijl
Hendrik Johannes van der Bijl FRS (23 November 1887 – 2 December 1948) was a South African electrical engineer and industrialist and is regarded as one of the greatest South Africans for his contribution to the country's development. He was the driving force behind the establishment of the South African electricity utility company Eskom and the South African Steel and Iron Corporation ISCOR. Early life and education Van der Bijl was born on 23 November 1887 in Pretoria to Pieter Gerhard van der Bijl and Hester Elizabeth Groenewald. He was the fifth of eight children. Pieter van der Bijl had been an ox-wagon driver between Cape Town and Kimberley and moved to Pretoria in 1887 where he became a prosperous grain and produce merchant. Pieter van der Bijl was acquainted with high-profile politicians such as Louis Botha and Jan Smuts. After the ill-fated Jameson Raid (1895) there was increased tension in the Transvaal Republic, of which Pretoria was the capital, and the young Va ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pretoria
Pretoria ( ; ) is the Capital of South Africa, administrative capital of South Africa, serving as the seat of the Executive (government), executive branch of government, and as the host to all foreign embassies to the country. Pretoria straddles the Apies River and extends eastward into the foothills of the Magaliesberg mountains. It has a reputation as an academic city and centre of research, being home to the Tshwane University of Technology (TUT), the University of Pretoria (UP), the University of South Africa (UNISA), the Council for Scientific and Industrial Research (CSIR), and the Human Sciences Research Council. It also hosts the National Research Foundation (South Africa), National Research Foundation and the South African Bureau of Standards. Pretoria was one of the host cities of the 2010 FIFA World Cup. Pretoria is the central part of the City of Tshwane Metropolitan Municipality which was formed by the amalgamation of several former local authorities, including B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Staats Model School
250px, View from Van der Walt / Lilian Ngoyi street The Staats Model School is situated on the corner of Lilian Ngoyi (previously Van der Walt) and Nana Sita (previously Skinner) Streets in Pretoria, Gauteng Province, Republic of South Africa. It originated from a school established in 1893 to train teachers in the Zuid Afrikaansche Republik, or ZAR. Alfred Fernandez Harington was appointed English master on 1 October 1895. Sytze Wierda, chief architect of the ZAR, designed the building in 1895, and its construction was completed by Te Groen in 1896. The structure consists of brick and Stinkwater sandstone and adheres to the Neo Dutch Renaissance school of architecture. On 11 October 1899 the school closed as a result of the outbreak of the Anglo-Boer War. During the war the building functioned as a hospital for Boer soldiers and as a prison for British officers. The escape of Winston Churchill, war correspondent and later British prime minister, from the building has beco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilhelm Hallwachs
Wilhelm Ludwig Franz Hallwachs (9 July 1859 – 20 June 1922) was a German physicist. He is knownn for the discovery of the photoelectric effect in collaboration with Heinrich Hertz. Life and career Early years Hallwachs was born in 1859 in Darmstadt to and Emilie Hallwachs. His father was a high ranking public official ( Geheimer Staatsrat) with the Ministry of the Interior and Justice of the Grand Duchy of Hesse, then part of the German Confederation. Career From 1878 Hallwachs studied physics, most of his time at the University of Strasbourg, then part of Germany he also did one year at the University of Berlin. At last he was an assistant to August Kundt at Strasbourg where he was awarded a doctorate in 1893. Hallwachs moved on to become an assistant to Friedrich Kohlrausch at the University of Würzburg where he stayed there from 1884 until 1886. In 1886, he went to Leipzig where he habilitated with Gustav Heinrich Wiedemann until 1888. After that he followed Friedrich ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dresden
Dresden (; ; Upper Saxon German, Upper Saxon: ''Dräsdn''; , ) is the capital city of the States of Germany, German state of Saxony and its second most populous city after Leipzig. It is the List of cities in Germany by population, 12th most populous city of Germany, the fourth largest by area (after Berlin, Hamburg, and Cologne), and the third-most populous city in the area of former East Germany, after Berlin and Leipzig. Dresden's urban area comprises the towns of Freital, Pirna, Radebeul, Meissen, Coswig, Saxony, Coswig, Radeberg, and Heidenau and has around 790,000 inhabitants. The Dresden metropolitan area has approximately 1.34 million inhabitants. Dresden is the second largest city on the River Elbe after Hamburg. Most of the city's population lives in the Dresden Basin, Elbe Valley, but a large, albeit very sparsely populated, area of the city east of the Elbe lies in the West Lusatian Hill Country and Uplands (the westernmost part of the Sudetes) and thus in Lusatia. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TU Dresden
TU Dresden (for , abbreviated as TUD), also as the Dresden University of Technology, is a public research university in Dresden, Germany. It is the largest institute of higher education in the city of Dresden, the largest university in Saxony and one of the 10 largest universities in Germany with 32,389 students . The name Technische Universität Dresden has only been used since 1961; the history of the university, however, goes back nearly 200 years to 1828. This makes it one of the oldest colleges of technology in Germany, and one of the country's oldest universities, which in German today refers to institutes of higher education that cover the entire curriculum. The university is a member of TU9, a consortium of the nine leading German Institutes of Technology. The university is one of eleven German universities which succeeded in the German Universities Excellence Initiative, Excellence Initiative in 2012, thus getting the title of a "University of Excellence". The TU Dresde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dielectric
In electromagnetism, a dielectric (or dielectric medium) is an Insulator (electricity), electrical insulator that can be Polarisability, polarised by an applied electric field. When a dielectric material is placed in an electric field, electric charges do not flow through the material as they do in an electrical conductor, because they have no loosely bound, or free, electrons that may drift through the material, but instead they shift, only slightly, from their average equilibrium positions, causing dielectric polarisation. Because of Polarisation density, dielectric polarisation, positive charges are displaced in the direction of the field and negative charges shift in the direction opposite to the field. This creates an internal electric field that reduces the overall field within the dielectric itself. If a dielectric is composed of weakly Chemical bond, bonded molecules, those molecules not only become polarised, but also reorient so that their Symmetry axis, symmetry axes a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radium
Radium is a chemical element; it has chemical symbol, symbol Ra and atomic number 88. It is the sixth element in alkaline earth metal, group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is silvery-white, but it readily reacts with nitrogen (rather than oxygen) upon exposure to air, forming a black surface layer of radium nitride (Ra3N2). All isotopes of radium are radioactive, the most stable isotope being radium-226 with a half-life of 1,600 years. When radium decays, it emits ionizing radiation as a by-product, which can excite fluorescent chemicals and cause radioluminescence. For this property, it was widely used in Self-luminous paint, self-luminous paints following its discovery. Of the Radionuclide, radioactive elements that occur in quantity, radium is considered particularly Toxicity, toxic, and it is Carcinogen, carcinogenic due to the radioactivity of both it and its immediate decay product radon as well as its tendency to B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ions
An ion () is an atom or molecule with a net electrical charge. The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by convention. The net charge of an ion is not zero because its total number of electrons is unequal to its total number of protons. A cation is a positively charged ion with fewer electrons than protons (e.g. K+ (potassium ion)) while an anion is a negatively charged ion with more electrons than protons (e.g. Cl− (chloride ion) and OH− (hydroxide ion)). Opposite electric charges are pulled towards one another by electrostatic force, so cations and anions attract each other and readily form ionic compounds. Ions consisting of only a single atom are termed ''monatomic ions'', ''atomic ions'' or ''simple ions'', while ions consisting of two or more atoms are termed polyatomic ions or ''molecular ions''. If only a + or − is present, it indicates ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Triode Vacuum Tube Collection
Early may refer to: Places in the United States * Early, Iowa, a city * Early, Texas, a city * Early Branch, a stream in Missouri * Early County, Georgia * Fort Early, Georgia, an early 19th century fort Music * Early B, stage name of Jamaican dancehall and reggae deejay Earlando Arrington Neil (1957–1994) * Early James, stage name of American singer-songwriter Fredrick Mullis Jr. (born 1993) * ''Early'' (Scritti Politti album), 2005 * ''Early'' (A Certain Ratio album), 2002 * Early Records, a record label Other uses * Early (name), a list of people and fictional characters with the given name or surname * Early effect, an effect in transistor physics * Early, a synonym for ''hotter'' in stellar classification See also * * The Earlies, a 21st century band * Earley (other) * Earlie Earlie is a masculine given name which may refer to: * Earlie Fires (born 1947), American jockey * Earlie Thomas (1945–2022), American National Football League player * Earlie End ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Martin Luther University Of Halle-Wittenberg
Martin Luther University Halle-Wittenberg (), also referred to as MLU, is a public university, public research university in the cities of Halle, Saxony-Anhalt, Halle and Wittenberg. It is the largest and oldest university in the German State of Germany, state of Saxony-Anhalt. MLU offers German and international (English) courses leading to academic degrees such as Bachelor of Arts, BA, B.Sc., BSc, Master of Arts, MA, M.Sc., MSc, Doctorate, doctoral degrees, and habilitation. The university was created in 1817 through the merger of the University of Wittenberg (founded in 1502) and the University of Halle (founded in 1694). MLU is named after Protestant Reformation, Protestant reformer Martin Luther, who was a professor in Wittenberg. Today, the university campus is located in Halle, while ''Leucorea Foundation'' in Wittenberg serves as MLU's convention centre. History University of Wittenberg (''Universität Wittenberg'') was founded in 1502 by Frederick III, Elector of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stellenbosch University
Stellenbosch University (SU) (, ) is a public research university situated in Stellenbosch, a town in the Western Cape province of South Africa. Stellenbosch is the oldest university in South Africa and the oldest extant university in Sub-Saharan Africa, which received full university status in 1918. Stellenbosch University designed and manufactured Africa's first microsatellite, SUNSAT, launched in 1999. Stellenbosch is organised in 139 departments across 10 faculties offering bachelor's (Education in South Africa#Higher education and training system, NQF 7) to doctoral degrees (NQF 10) in the English and Afrikaans language. Across five campuses in the Western Cape, the university is home to 32,000 students. The students of Stellenbosch University are nicknamed "Maties". The term probably arises from the Afrikaans word "tamatie" (meaning tomato, and referring to the maroon sports uniforms and blazer colour). An alternative theory is that the term comes from the Afrikaans colloq ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Franschhoek
Franschhoek (; Afrikaans for "French Corner", Dutch spelling before 1947 ''Fransche Hoek'', French: ''Le Coin Français'') is a small town in the Western Cape Province and one of the oldest towns in South Africa. It was formerly known as Oliphants hoek (as there were vast groups of elephants roaming the valley). It is situated about from Cape Town, a 45-minute drive away. The whole area, including townships such as Groendal and suburbs such as Wemmershoek, has a population of slightly over 20,000 people while the town proper, known as Hugenote, has a population of around 1,000. Since 2000, it has been incorporated into Stellenbosch Municipality. In 2022, Franschhoek was mentioned in ''Time'' magazine as one of the top 50 places in the world to visit. History Franschhoek's original inhabitants are the Khoisan peoples. They are now mostly extinct, but their descendants continue to live in the area as mixed race (Khoisan and French/Dutch) people. In 1685, King Louis XIV bann ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
