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Konstantinos Fostiropoulos
Konstantinos Fostiropoulos is a Greek physicist who has been working in Germany in the areas nano-materials, solid-state physics, molecular physics, astrophysics, and thermodynamics. From 2003 to 2016 he has been founder and head of the ''Organic Solar Cells Group'' at the Institute Heterogeneous Materials Systems within the Helmholtz-Zentrum Berlin. His scientific works include novel energy materials and photovoltaic device concepts, carbon clusters in the Interstellar Medium, and intermolecular forces of real gases. In 1989 Fostiropoulos was the first to synthesize C60,"Dusty Objects in the Universe, September 1989, Capri, Italy", conference proceedings, page 89-93"Search for the UV and IR spectra of C60 in laboratory-produced carbon dust"/ref> a molecular carbon modification, in preparative amountsJournal of BGRCI, page 1"Fostiropoulos... konnte schließlich erstmals einige Gramm reines Fulleren herstellen."/ref> by a specifically developed vacuum process. After the discov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Krya Vrysi, Pella
Krya Vrysi ( el, Κρύα Βρύση, before 1927: Πλάσνα ''Plasna'') is a town and a former municipality in Pella (regional unit), Pella regional unit, Greece. Since the 2011 local government reform it is part of the municipality Pella (municipality), Pella, of which it is a municipal unit. The municipal unit has an area of 76.956 km2. It is located 75 km west of Thessaloniki and 2 km east of the Neolithic, Early Neolithic settlement of Nea Nikomedeia. History The town of Krya Vrysi, named ''Plasna'' before 1927, became an independent community in 1934, when it was separated from Esovalta, Valta. After the lake that covered the place was drained, the people had trouble finding drinkable water. When they found a source of cold, clear water, they called it "water from the ''Krya Vrysi'' (Cold Spring)", thus giving the town its name. The community Krya Vrysi became a municipality in 1990. The economy in the area is primarily based on agriculture with the farmers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interstellar Medium
In astronomy, the interstellar medium is the matter and radiation that exist in the space between the star systems in a galaxy. This matter includes gas in ionic, atomic, and molecular form, as well as dust and cosmic rays. It fills interstellar space and blends smoothly into the surrounding intergalactic space. The energy that occupies the same volume, in the form of electromagnetic radiation, is the interstellar radiation field. The interstellar medium is composed of multiple phases distinguished by whether matter is ionic, atomic, or molecular, and the temperature and density of the matter. The interstellar medium is composed, primarily, of hydrogen, followed by helium with trace amounts of carbon, oxygen, and nitrogen. The thermal pressures of these phases are in rough equilibrium with one another. Magnetic fields and turbulent motions also provide pressure in the ISM, and are typically more important, dynamically, than the thermal pressure is. In the interstellar medium, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bonn
The federal city of Bonn ( lat, Bonna) is a city on the banks of the Rhine in the German state of North Rhine-Westphalia, with a population of over 300,000. About south-southeast of Cologne, Bonn is in the southernmost part of the Rhine-Ruhr region, Germany's largest metropolitan area, with over 11 million inhabitants. It is a university city and the birthplace of Ludwig van Beethoven. Founded in the 1st century BC as a Roman settlement in the province Germania Inferior, Bonn is one of Germany's oldest cities. It was the capital city of the Electorate of Cologne from 1597 to 1794, and residence of the Archbishops and Prince-electors of Cologne. From 1949 to 1990, Bonn was the capital of West Germany, and Germany's present constitution, the Basic Law, was declared in the city in 1949. The era when Bonn served as the capital of West Germany is referred to by historians as the Bonn Republic. From 1990 to 1999, Bonn served as the seat of government – but no longer capital – ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sankt Augustin
Sankt Augustin ( Ripuarian: ''Sank Aujustin'') is a town in the Rhein-Sieg district, in North Rhine-Westphalia, Germany. It is named after the patron saint of the Divine Word Missionaries, Saint Augustine of Hippo (354-430). The Missionaries established a monastery near the current town centre in 1913. The municipality of Sankt Augustin was established in 1969, and on September 6, 1977 Sankt Augustin acquired town privileges (German: ''Stadtrechte''). Sankt Augustin is situated about eight km north-east of Bonn and three km south-west of Siegburg. Mayors *1969–1984: Karl Gatzweiler ( CDU) *1989–1994: Wilfried Wessel (CDU) *1994–1995: Anke Riefers (SPD) *1995: Hans Jaax (SPD) (temporary) *1995–1999: Anke Riefers (SPD) *1999–2020: Klaus Schumacher (CDU) *Since 2020: Max Leitterstorf (CDU) Twin towns – sister cities Sankt Augustin is twinned with: * Grantham, England, United Kingdom * Mevaseret Zion, Israel * Szentes, Hungary Government organizations * West Reg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karlsruhe
Karlsruhe ( , , ; South Franconian: ''Kallsruh'') is the third-largest city of the German state (''Land'') of Baden-Württemberg after its capital of Stuttgart and Mannheim, and the 22nd-largest city in the nation, with 308,436 inhabitants. It is also a former capital of Baden, a historic region named after Hohenbaden Castle in the city of Baden-Baden. Located on the right bank of the Rhine near the French border, between the Mannheim/ Ludwigshafen conurbation to the north and Strasbourg/Kehl to the south, Karlsruhe is Germany's legal center, being home to the Federal Constitutional Court (''Bundesverfassungsgericht''), the Federal Court of Justice (''Bundesgerichtshof'') and the Public Prosecutor General of the Federal Court of Justice (''Generalbundesanwalt beim Bundesgerichtshof''). Karlsruhe was the capital of the Margraviate of Baden-Durlach (Durlach: 1565–1718; Karlsruhe: 1718–1771), the Margraviate of Baden (1771–1803), the Electorate of Baden (1803–1806), th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mannheim
Mannheim (; Palatine German: or ), officially the University City of Mannheim (german: Universitätsstadt Mannheim), is the second-largest city in the German state of Baden-Württemberg after the state capital of Stuttgart, and Germany's 21st-largest city, with a 2020 population of 309,119 inhabitants. The city is the cultural and economic centre of the Rhine-Neckar Metropolitan Region, Germany's seventh-largest metropolitan region with nearly 2.4 million inhabitants and over 900,000 employees. Mannheim is located at the confluence of the Rhine and the Neckar in the Kurpfalz (Electoral Palatinate) region of northwestern Baden-Württemberg. The city lies in the Upper Rhine Plain, Germany's warmest region. Together with Hamburg, Mannheim is the only city bordering two other federal states. It forms a continuous conurbation of around 480,000 inhabitants with Ludwigshafen am Rhein in the neighbouring state of Rhineland-Palatinate, on the other side of the Rhine. Some northe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Distance Education
Distance education, also known as distance learning, is the education of students who may not always be physically present at a school, or where the learner and the teacher are separated in both time and distance. Traditionally, this usually involved correspondence courses wherein the student corresponded with the school via mail. Distance education is a technology mediated modality and has evolved with the evolution of technologies such as video conferencing, TV, and internet. Today, it usually involves online education and the learning is usually mediated by some form of technology. A distance learning program can be completely distance learning, or a combination of distance learning and traditional classroom instruction (called hybrid or Blended learning, blended). Other modalities include distance learning with complementary virtual environment or teaching in virtual environment (e-learning). Massive open online courses (MOOCs), offering large-scale interactive participation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
C60 Fullerene
Buckminsterfullerene is a type of fullerene with the formula C60. It has a cage-like fused-ring structure (truncated icosahedron) made of twenty hexagons and twelve pentagons, and resembles a soccer ball. Each of its 60 carbon atoms is bonded to its three neighbors. Buckminsterfullerene is a black solid that dissolves in hydrocarbon solvents to produce a violet solution. The compound was discovered in 1985 and has received intense study, although few real world applications have been found. Occurrence Buckminsterfullerene is the most common naturally occurring fullerene. Small quantities of it can be found in soot. It also exists in space. Neutral C60 has been observed in planetary nebulae and several types of star. The ionised form, C60+, has been identified in the interstellar medium, where it is the cause of several absorption features known as diffuse interstellar bands in the near-infrared. History Theoretical predictions of buckyball molecules appeared in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phthalocyanine
Phthalocyanine () is a large, aromatic, macrocyclic, organic compound with the formula and is of theoretical or specialized interest in chemical dyes and photoelectricity. It is composed of four isoindole units linked by a ring of nitrogen atoms. = has a two-dimensional geometry and a ring system consisting of 18 π-electrons. The extensive delocalization of the π-electrons affords the molecule useful properties, lending itself to applications in dyes and pigments. Metal complexes derived from , the conjugate base of , are valuable in catalysis, organic solar cells, and photodynamic therapy. Properties Phthalocyanine and derived metal complexes (MPc) tend to aggregate and, thus, have low solubility in common solvents. Benzene at 40 °C dissolves less than a milligram of or CuPc per litre. and CuPc dissolve easily in sulfuric acid due to the protonation of the nitrogen atoms bridging the pyrrole rings. Many phthalocyanine compounds are, thermally, very stabl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Organic Photovoltaic
An organic solar cell (OSC) or plastic solar cell is a type of photovoltaic that uses organic electronics, a branch of electronics that deals with conductive organic polymers or small organic molecules, for light absorption and charge transport to produce electricity from sunlight by the photovoltaic effect. Most organic photovoltaic cells are polymer solar cells. The molecules used in organic solar cells are solution-processable at high throughput and are cheap, resulting in low production costs to fabricate a large volume. Combined with the flexibility of organic molecules, organic solar cells are potentially cost-effective for photovoltaic applications. Molecular engineering (''e.g.,'' changing the length and functional group of polymers) can change the band gap, allowing for electronic tunability. The optical absorption coefficient of organic molecules is high, so a large amount of light can be absorbed with a small amount of materials, usually on the order of hundreds of nan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fullerene Chemistry
Fullerene chemistry is a field of organic chemistry devoted to the chemical properties of fullerenes. Research in this field is driven by the need to functionalize fullerenes and tune their properties. For example, fullerene is notoriously insoluble and adding a suitable group can enhance solubility. By adding a polymerizable group, a fullerene polymer can be obtained. Functionalized fullerenes are divided into two classes: exohedral fullerenes with substituents outside the cage and endohedral fullerenes with trapped molecules inside the cage. This article covers the chemistry of these so-called "buckyballs," while the chemistry of carbon nanotubes is covered in carbon nanotube chemistry. Chemical properties of fullerenes Fullerene or C60 is soccer-ball-shaped or ''Ih'' with 12 pentagons and 20 hexagons. According to Euler's theorem these 12 pentagons are required for closure of the carbon network consisting of ''n'' hexagons and C60 is the first stable fullerene because it i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harry Kroto
Sir Harold Walter Kroto (born Harold Walter Krotoschiner; 7 October 1939 – 30 April 2016), known as Harry Kroto, was an English chemist. He shared the 1996 Nobel Prize in Chemistry with Robert Curl and Richard Smalley for their discovery of fullerenes. He was the recipient of many other honors and awards. Kroto ended his career as the Francis Eppes Professor of Chemistry at Florida State University, which he joined in 2004. Prior to this, he spent approximately 40 years at the University of Sussex. Kroto promoted science education and was a critic of religious faith. Early years Kroto was born in Wisbech, Isle of Ely, Cambridgeshire, England, to Edith and Heinz Krotoschiner, his name being of Silesian origin. His father's family came from Bojanowo, Poland, and his mother's from Berlin. Both of his parents were born in Berlin and fled to Great Britain in the 1930s as refugees from Nazi Germany; his father was Jewish. Harry was raised in Bolton while the British authorities ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
