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László Szebellédy
László Szebellédy (20 April 1901 – 23 January 1944) was a Hungarian chemist who contributed to electrochemistry with the development of Coulometric analytical techniques for detecting small quantities of chemicals with precision. He served as a professor at the Pázmány Péter University. Szebellédy was born in Rétság and went to the Pázmány Péter University where he studied pharmacy, and obtained a doctorate in 1926. He then joined as an assistant to Professor Lajos Winkler Lajos Winkler (May 21, 1863 – April 14, 1939) was a Hungary, Hungarian analytical chemist. He is best known today for his discovery of the Winkler method for the measurement of oxygen dissolved in water. Life Relatively little is in prin ... (1863–1939). In 1933 he became an assistant professor. He went to Zurich, Dresden and Leipzig, working at the laboratories of W. D. Treadwell, Max Le Blanc (1865-1943) and Wilhelm Böttger (1871–1949). In 1935-36 he taught chemical analysis and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrochemistry
Electrochemistry is the branch of physical chemistry concerned with the relationship between electrical potential difference, as a measurable and quantitative phenomenon, and identifiable chemical change, with the potential difference as an outcome of a particular chemical change, or vice versa. These reactions involve electrons moving via an electronically-conducting phase (typically an external electrical circuit, but not necessarily, as in electroless plating) between electrodes separated by an ionically conducting and electronically insulating electrolyte (or ionic species in a solution). When a chemical reaction is driven by an electrical potential difference, as in electrolysis, or if a potential difference results from a chemical reaction as in an electric battery or fuel cell, it is called an ''electrochemical'' reaction. Unlike in other chemical reactions, in electrochemical reactions electrons are not transferred directly between atoms, ions, or molecules, but via the af ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coulometry
Coulometry determines the amount of matter transformed during an electrolysis reaction by measuring the amount of electricity (in coulombs) consumed or produced. It can be used for precision measurements of charge, and the amperes even used to have a coulometric definition. However, today coulometry is mainly used for analytical applications. Coulometry is a group of techniques in analytical chemistry. It is named after Charles-Augustin de Coulomb. There are two basic categories of coulometric techniques. ''Potentiostatic coulometry'' involves holding the electric potential constant during the reaction using a potentiostat. The other, called ''coulometric titration'' or ''amperostatic coulometry'', keeps the current (measured in amperes) constant using an amperostat. Potentiostatic coulometry Potentiostatic coulometry is a technique most commonly referred to as "bulk electrolysis". The working electrode is kept at a constant potential and the current that flows through the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pázmány Péter Catholic University
Pázmány Péter Catholic University (PPCU) ( hu, Pázmány Péter Katolikus Egyetem (''PPKE'')) is a private university in and near Budapest, Hungary, belonging to the Catholic Church and recognized by the state. Founded in 1635, the PPCU is one of Hungary's oldest and most prestigious institutions of higher education. The Faculty of Theology was established by archbishop Péter Pázmány in Nagyszombat, the Kingdom of Hungary (today Trnava, Slovakia) in 1635. The university is located in two cities: the Rectors' Office, the Faculty of Theology, the Faculty of Law, the Faculty of Information Technology, and the Postgraduate Institute of Canon-Law are located in Budapest. The campus of the Vitéz János Faculty of Teaching is in Esztergom, just across the Esztergom Basilica. The Faculty of Humanities operated a campus in Piliscsaba, in the vicinity of Budapest from 1994 until end-2020, after which it relocated its departments and courses to Budapest. The university has sever ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rétság
Rétság is a small town in Nógrád county, in Hungary. Location Rétság is located north of Budapest on the E77 European main road, halfway between Vác and Balassagyarmat. The town is seated at the border of Cserhát and Börzsöny hills. Its location determines the function of the town. History The settlement was property of the Losonczy family in 1393, its name was Réthy Saag. The Ottoman conquest started in the middle of the 16th century (when castle Nógrád was captured by the Ottoman army) and lasted till the middle of the 17th century. During the Ottoman conquest Rétság became near totally desolated. Big landowners was in Rétság: Mehmed Daud 1562-1563, Ottoman from liva of Hussein pasha 1566-1567, Bosna Hassan 1583-1584, Gábor Lónyai 1656, Paul Sréter and his family 1770, widow count Mrs. Béla Benyovszky, Sándor Rosenbach, Frigyes Herzfeld in 1910. The St. Andrew Roman Catholic church was built in 1726. The railway connection and the railway station was b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lajos Winkler
Lajos Winkler (May 21, 1863 – April 14, 1939) was a Hungary, Hungarian analytical chemist. He is best known today for his discovery of the Winkler method for the measurement of oxygen dissolved in water. Life Relatively little is in print in English concerning the life of Lajos Winkler. Winkler studied science at the University of Budapest, Budapest University of Science, receiving his doctorate there in 1890, while working with Carl von Than. He stayed on to work as a lecturer, among other positions, and directed the Institute of Chemistry, starting in 1909, for more than 25 years. He is said to have published several hundred papers, to have helped found the ''Hungarian Journal of Chemistry'', and to have been a member of the Hungarian Academy of Sciences. See also the study of Vamos for more information and references. Dissolved oxygen Natural water contains molecular oxygen (O2), necessary for life in ponds, rivers, and so on. A common nineteenth-century test fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Max Le Blanc
Max Julius Louis Le Blanc (1865 – 1943) was a German physical chemist who worked in the field of electrochemistry, writing an influential textbook in 1895 on the subject which went through several editions. He was a professor at the Technical University of Karlsruhe, later at the Wilhelm Ostwald Institute at Leipzig. He is best known for inventing the hydrogen electrode used for pH measurements. In 1933 he was a signatory to the Vow of allegiance of the Professors of the German Universities and High-Schools to Adolf Hitler and the National Socialistic State. Life and work Le Blanc was born on 26 May 1865 in Barten, Kingdom of Prussia to builder Louis and his wife Marie Kickton and after studying at the Gymnasium in Rastenburg, he went to the universities at Tübingen and Berlin. His doctoral work of 1888 was on organic chemistry under August Wilhelm von Hofmann. He however moved to physical chemistry and worked under Wilhelm Ostwald at Leipzig from 1891. He worked in elec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Faraday's Laws Of Electrolysis
Faraday's laws of electrolysis are quantitative relationships based on the electrochemical research published by Michael Faraday in 1833. First law Michael Faraday reported that the mass (m) of elements deposited at an electrode is directly proportional to the charge (Q; SI units are ampere seconds or coulombs). \begin m &\propto Q \\ \implies \frac &= Z \end Here, the constant of proportionality, Z, is called the electro-chemical equivalent (e.c.e) of the substance. Thus, the e.c.e. can be defined as the mass of the substance deposited/liberated per unit charge. Second law Faraday discovered that when the same amount of electric current is passed through different electrolytes/elements connected in series, the mass of the substance liberated/deposited at the electrodes is directly proportional to their chemical equivalent/equivalent weight (E). This turns out to be the molar mass (M) divided by the valence (v) : m \propto E : E = \frac : \implies m_1 : m_2 : m_3 : ... ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1901 Births
Nineteen or 19 may refer to: * 19 (number), the natural number following 18 and preceding 20 * one of the years 19 BC, AD 19, 1919, 2019 Films * 19 (film), ''19'' (film), a 2001 Japanese film * Nineteen (film), ''Nineteen'' (film), a 1987 science fiction film Music * 19 (band), a Japanese pop music duo Albums * 19 (Adele album), ''19'' (Adele album), 2008 * ''19'', a 2003 album by Alsou * ''19'', a 2006 album by Evan Yo * ''19'', a 2018 album by MHD (rapper), MHD * ''19'', one half of the double album ''63/19'' by Kool A.D. * ''Number Nineteen'', a 1971 album by American jazz pianist Mal Waldron * XIX (EP), ''XIX'' (EP), a 2019 EP by 1the9 Songs * 19 (song), "19" (song), a 1985 song by British musician Paul Hardcastle. * "Nineteen", a song by Bad4Good from the 1992 album ''Refugee (Bad4Good album), Refugee'' * "Nineteen", a song by Karma to Burn from the 2001 album ''Almost Heathen''. * Nineteen (song), "Nineteen" (song), a 2007 song by American singer Billy Ray Cyrus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1944 Deaths
Events Below, the events of World War II have the "WWII" prefix. January * January 2 – WWII: ** Free France, Free French General Jean de Lattre de Tassigny is appointed to command First Army (France), French Army B, part of the Sixth United States Army Group in North Africa. ** Landing at Saidor: 13,000 US and Australian troops land on Papua New Guinea, in an attempt to cut off a Japanese retreat. * January 8 – WWII: Philippine Commonwealth troops enter the province of Ilocos Sur in northern Luzon and attack Japanese forces. * January 11 ** President of the United States Franklin D. Roosevelt proposes a Second Bill of Rights for social and economic security, in his State of the Union address. ** The Nazi German administration expands Kraków-Płaszów concentration camp into the larger standalone ''Konzentrationslager Plaszow bei Krakau'' in occupied Poland. * January 12 – WWII: Winston Churchill and Charles de Gaulle begin a 2-day conference in Marrakech ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
