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Friedrich Liebau
Friedrich Karl Franz Liebau (May 31, 1926 – 11 March 2011) was a German chemist, crystallographer, and mineralogist known for his research in silicates. Education and career Liebau was born on 31 May 1926, in Berlin. He grew up as the son of the upholsterer Otto Liebau and his wife Anna Liebau, née Hecklau, along with two sisters in Berlin. After graduating from high school, he was called up for military service and served in the war from 1944 to 1945. He experienced the end of the war with gunshot wounds in the hospital and thus escaped a longer period of imprisonment in Siberia. After World War II, Liebau studied chemistry at the Humboldt University of Berlin and later at the German Academy of Sciences at Berlin. He worked the supervision of Erich Thilo and received his diploma in 1951 with the thesis "''Über das Na2BeF4 und seine Beziehung zum Ca2SiO4''", and followed by his doctorate in 1956 with the doctoral thesis "''Über die Kristallstrukturen des (NaAsO3)x, der Hoch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silicate
A silicate is any member of a family of polyatomic anions consisting of silicon and oxygen, usually with the general formula , where . The family includes orthosilicate (), metasilicate (), and pyrosilicate (, ). The name is also used for any salt of such anions, such as sodium metasilicate; or any ester containing the corresponding chemical group, such as tetramethyl orthosilicate. The name "silicate" is sometimes extended to any anions containing silicon, even if they do not fit the general formula or contain other atoms besides oxygen; such as hexafluorosilicate . Most commonly, silicates are encountered as silicate minerals. For diverse manufacturing, technological, and artistic needs, silicates are versatile materials, both natural (such as granite, gravel, and garnet) and artificial (such as Portland cement, ceramics, glass, and waterglass). Structural principles In most silicates, a silicon atom occupies the center of an idealized tetrahedron whose cor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bond Valence Method
The bond valence method or mean method (or bond valence sum) (not to be mistaken for the valence bond theory in quantum chemistry) is a popular method in coordination chemistry to estimate the oxidation states of atoms. It is derived from the bond valence model, which is a simple yet robust model for validating chemical structures with localized bonds or used to predict some of their properties. This model is a development of Pauling's rules. Method The basic method is that the valence ''V'' of an atom is the sum of the individual bond valences ''v''i surrounding the atom: : V = \sum(v_\text) The individual bond valences in turn are calculated from the observed bond lengths. : v_\text=\exp \left( \frac \right) ''R''i is the observed bond length, ''R''0 is a tabulated parameter expressing the (ideal) bond length when the element ''i'' has exactly valence 1, and ''b'' is an empirical constant, typically 0.37 Å. Another formula for v_\text has also been used: : v_\text= \left ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Academic Staff Of The University Of Kiel
An academy (Attic Greek: Ἀκαδήμεια; Koine Greek Ἀκαδημία) is an institution of tertiary education. The name traces back to Plato's school of philosophy, founded approximately 386 BC at Akademia, a sanctuary of Athena, the goddess of wisdom and Skills, skill, north of Ancient Athens, Athens, Greece. The Royal Spanish Academy defines academy as scientific, literary or artistic society established with public authority and as a teaching establishment, public or private, of a professional, artistic, technical or simply practical nature. Etymology The word comes from the ''Academy'' in ancient Greece, which derives from the Athenian hero, ''Akademos''. Outside the city walls of Athens, the Gymnasium (ancient Greece), gymnasium was made famous by Plato as a center of learning. The sacred space, dedicated to the goddess of wisdom, Athena, had formerly been an olive Grove (nature), grove, hence the expression "the groves of Academe". In these gardens, the philos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Humboldt University Of Berlin Alumni
Humboldt may refer to: People * Alexander von Humboldt, German natural scientist, brother of Wilhelm von Humboldt * Wilhelm von Humboldt, German linguist, philosopher, and diplomat, brother of Alexander von Humboldt Fictional characters * Humboldt Fleisher, character in novel ''Humboldt's Gift'' * Wes Humboldt, character played by Mike O'Brien on ''Corner Gas'' Places Argentina * Humboldt, Argentina, a town in Santa Fe Province, Argentina Australia * Humboldt, Queensland, a locality in the Central Highlands Region Canada * Humboldt, Saskatchewan * Rural Municipality of Humboldt No. 370, Saskatchewan * Humboldt (federal electoral district), a former federal electoral district * Humboldt (provincial electoral district), a former Saskatchewan provincial electoral district United States * Settled places: ** Dewey-Humboldt, Arizona ** Humboldt, Illinois ** Humboldt, Iowa ** Humboldt, Kansas ** Humboldt, Minnesota ** Humboldt, Nebraska ** Humboldt, Ohio ** Humb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Crystallographers
German(s) may refer to: * Germany, the country of the Germans and German things **Germania (Roman era) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizenship in Germany, see also German nationality law **Germanic peoples (Roman era) *German diaspora * German language * German cuisine, traditional foods of Germany People * German (given name) * German (surname) * Germán, a Spanish name Places * German (parish), Isle of Man * German, Albania, or Gërmej * German, Bulgaria * German, Iran * German, North Macedonia * German, New York, U.S. * Agios Germanos, Greece Other uses * German (mythology), a South Slavic mythological being * Germans (band), a Canadian rock band * "German" (song), a 2019 song by No Money Enterprise * ''The German'', a 2008 short film * "The Germans", an episode of ''Fawlty Towers'' * ''The German'', a nickname for Congolese rebel André Kisase Ngandu See also * Germanic (disambiguat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1926 Births
In Turkey, the year technically contained only 352 days. As Friday, December 18, 1926 ''(Julian Calendar)'' was followed by Saturday, January 1, 1927 '' (Gregorian Calendar)''. 13 days were dropped to make the switch. Turkey thus became the last country to officially adopt the Gregorian Calendar, which ended the 344-year calendrical switch around the world that took place in October, 1582 by virtue of the Papal Bull made by Pope Gregory XIII. Events January * January 3 – Theodoros Pangalos declares himself dictator in Greece. * January 8 **Ibn Saud is crowned ruler of the Kingdom of Hejaz. ** Crown Prince Nguyễn Phúc Vĩnh Thuy ascends the throne as Bảo Đại, the last monarch of the Nguyễn dynasty of the Kingdom of Vietnam. * January 16 – A British Broadcasting Company radio play by Ronald Knox about workers' revolution in London causes a panic among those who have not heard the preliminary announcement that it is a satire on broadcasting. * January 21 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2011 Deaths
This is a list of lists of deaths of notable people, organized by year. New deaths articles are added to their respective month (e.g., Deaths in ) and then linked below. 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 Earlier years ''Deaths in years earlier than this can usually be found in the main articles of the years.'' See also * Lists of deaths by day * Deaths by year (category) {{DEFAULTSORT:deaths by year ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eifel
The Eifel (; , ) is a low mountain range in western Germany, eastern Belgium and northern Luxembourg. It occupies parts of southwestern North Rhine-Westphalia, northwestern Rhineland-Palatinate and the southern area of the German-speaking Community of Belgium. The Eifel is part of the Rhenish Massif; within its northern portions lies the Eifel National Park. The Eifelian stage in geological history is named after the region because rocks of that period reach the surface in the Eifel at the Wetteldorf Richtschnitt outcrop. The inhabitants of the Eifel are known as Eiflers or Eifelers. Geography Location The Eifel lies between the cities of Aachen to the north, Trier to the south and Koblenz to the east. It descends in the northeast along a line from Aachen via Düren to Bonn into the Lower Rhine Bay. In the east and south it is bounded by the valleys of the Rhine and the Moselle. To the west it transitions in Belgium and Luxembourg into the geologically related Ardenn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carl Hermann Medal
The Carl Hermann Medal is the highest award in the field of crystallography from the German Crystallographic Society. It is named after the German physicist and professor of crystallography Carl Hermann, who along with Paul Peter Ewald, created the Strukturbericht designation system for crystallographic prototypes. The medal is awarded annually during the annual meeting of the society Carl Hermann Medal recipients * 1996 Gerhard Borrmann * 1997 Hartmut Bärnighausen * 1998 Siegfried Haussühl * 1999 George Sheldrick * 2000 Heinz Jagodzinski * 2001 Theo Hahn, Hans Wondratschek * 2002 Friedrich Liebau Friedrich Karl Franz Liebau (May 31, 1926 – 11 March 2011) was a German chemist, crystallographer, and mineralogist known for his research in silicates. Education and career Liebau was born on 31 May 1926, in Berlin. He grew up as the son of ... * 2003 Hans-Joachim Bunge * 2004 Wolfram Saenger * 2005 Peter Paufler * 2006 Werner Fischer * 2008 Hans Burzlaff * 2009 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Crystallographic Society
The German Crystallographic Society (''Deutsche Gesellschaft für Kristallographie'', or DGK in German) is a non-profit organization based in Berlin. As a voluntary association of scientists working in crystallography or interested in crystallography and other people and institutions, its goal is to promote crystallography in teaching, research and industrial practice as well as in the public, in particular by fostering the exchange of experience and ideas as well as further education at national and international level Frame. Working groups are dedicated to specific areas of crystallography. The Society has just over 1000 members. Activities The DGK represents crystallography in national and international scientific institutions. In particular, the DGK is a member body of the International Union of Crystallography (IUCr) and the European Crystallographic Association (ECA). The DGK nominates candidates for the crystallographically relevant review boards of the German Research Fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
