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Bohdan Paczyński
Bohdan Paczyński or Bohdan Paczynski (8 February 1940 – 19 April 2007) was a Polish astronomer notable in the theory of the stellar evolution, accretion discs, and gamma ray bursts. Life Paczyński was born on 8 February 1940 in Vilnius, Lithuania, to a lawyer and a teacher of Polish literature. In 1945 his family chose to leave for Poland and settled in Kraków, and then in 1949 in Warsaw. At the age of 18, Paczyński published his first scientific article in ''Acta Astronomica''. Between 1959 and 1962 he studied astronomy at the University of Warsaw. Two years later he received a doctorate under the tutelage of Stefan Piotrowski and Włodzimierz Zonn. In 1962 Paczyński became a member of the Centre of Astronomy of the Polish Academy of Sciences, where he continued to work for nearly 20 years. In 1974 he received habilitation and in 1979 became a professor. Thanks to his works on theoretical astronomy, at the age of 36 he became the youngest member of the Polish Academy o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vilnius
Vilnius ( , ; see also other names) is the capital and largest city of Lithuania, with a population of 592,389 (according to the state register) or 625,107 (according to the municipality of Vilnius). The population of Vilnius's functional urban area, which stretches beyond the city limits, is estimated at 718,507 (as of 2020), while according to the Vilnius territorial health insurance fund, there were 753,875 permanent inhabitants as of November 2022 in Vilnius city and Vilnius district municipalities combined. Vilnius is situated in southeastern Lithuania and is the second-largest city in the Baltic states, but according to the Bank of Latvia is expected to become the largest before 2025. It is the seat of Lithuania's national government and the Vilnius District Municipality. Vilnius is known for the architecture in its Old Town, declared a UNESCO World Heritage Site in 1994. The city was noted for its multicultural population already in the time of the Polish–Lithuanian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marian Smoluchowski Medal
The Marian Smoluchowski Medal is a Polish annual science award conferred by the Polish Physical Society (''Polskie Towarzystwo Fizyczne, PTF'') for contributions in the field of physics. Description The medal was established in 1965 and is the highest award presented by the Polish Physical Society. It was named in honour of physicist Marian Smoluchowski (1872 – 1917). It is awarded to scientists whose work significantly contributed to the advancement of one of the branches of physics irrespective of the scientific degree, place of work or nationality of the laureate. It can be given for a single published work or as a lifetime achievement award. It is conferred by the Awards Committee of the Polish Physical Society, currently, no more than once a year. Laureates The list of scientists awarded with Marian Smoluchowski Medal: * Iwo Białynicki-Birula (2021) * Józef Spałek (2019) * Jerzy Lukierski (2017) * Henryk Szymczak (2015) *not awarded (2014) * Jan Misiewicz (2013) * Doug ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caltech
The California Institute of Technology (branded as Caltech or CIT)The university itself only spells its short form as "Caltech"; the institution considers other spellings such a"Cal Tech" and "CalTech" incorrect. The institute is also occasionally referred to as "CIT", most notably in its alma mater, but this is uncommon. is a private university, private research university in Pasadena, California. Caltech is ranked among the best and most selective academic institutions in the world, and with an enrollment of approximately 2400 students (acceptance rate of only 5.7%), it is one of the world's most selective universities. The university is known for its strength in science and engineering, and is among a small group of Institute of Technology (United States), institutes of technology in the United States which is primarily devoted to the instruction of pure and applied sciences. The institution was founded as a preparatory and vocational school by Amos G. Throop in 1891 and began ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gazeta Wyborcza
''Gazeta Wyborcza'' (; ''The Electoral Gazette'' in English) is a Polish daily newspaper based in Warsaw, Poland. It is the first Polish daily newspaper after the era of "real socialism" and one of Poland's newspapers of record, covering the gamut of political, international and general news from a liberal perspective. History and profile The ''Gazeta Wyborcza'' was first published on 8 May 1989, under the rhyming masthead motto, "''Nie ma wolności bez Solidarności''" ("There's no freedom without Solidarity"). The founders were Andrzej Wajda, Aleksander Paszyński and Zbigniew Bujak. Its founding was an outcome of the Polish Round Table Agreement between the communist government of the People's Republic of Poland and political opponents centred on the Solidarity movement. It was initially owned by Agora SA. Later the American company Cox Communications partially bought the daily. The paper was to serve as the voice of the Solidarity movement during the run-up to the 198 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acta Astronomica
''Acta Astronomica'' is a quarterly peer-reviewed scientific journal covering astronomy and astrophysics. It was established in 1925 by the Polish astronomer Tadeusz Banachiewicz. Initially, the journal published articles in Latin, later English, French, and German were added as allowed journal languages. Nowadays, all papers are published in English. The journal is published by Copernicus Foundation for Polish Astronomy and the editors-in-chief are M. Jaroszyński and Andrzej Udalski (University of Warsaw). Abstracting and indexing This journal is indexed in Current Contents/Physical, Chemical & Earth Sciences, the Science Citation Index Expanded, and Scopus. According to the ''Journal Citation Reports'', the journal has a 2019 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Warsaw
Warsaw ( pl, Warszawa, ), officially the Capital City of Warsaw,, abbreviation: ''m.st. Warszawa'' is the capital and largest city of Poland. The metropolis stands on the River Vistula in east-central Poland, and its population is officially estimated at 1.86 million residents within a greater metropolitan area of 3.1 million residents, which makes Warsaw the 7th most-populous city in the European Union. The city area measures and comprises 18 districts, while the metropolitan area covers . Warsaw is an Alpha global city, a major cultural, political and economic hub, and the country's seat of government. Warsaw traces its origins to a small fishing town in Masovia. The city rose to prominence in the late 16th century, when Sigismund III decided to move the Polish capital and his royal court from Kraków. Warsaw served as the de facto capital of the Polish–Lithuanian Commonwealth until 1795, and subsequently as the seat of Napoleon's Duchy of Warsaw. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kraków
Kraków (), or Cracow, is the second-largest and one of the oldest cities in Poland. Situated on the Vistula River in Lesser Poland Voivodeship, the city dates back to the seventh century. Kraków was the official capital of Poland until 1596 and has traditionally been one of the leading centres of Polish academic, economic, cultural and artistic life. Cited as one of Europe's most beautiful cities, its Old Town with Wawel Royal Castle was declared a UNESCO World Heritage Site in 1978, one of the first 12 sites granted the status. The city has grown from a Stone Age settlement to Poland's second-most-important city. It began as a hamlet on Wawel Hill and was reported by Ibrahim Ibn Yakoub, a merchant from Cordoba, as a busy trading centre of Central Europe in 985. With the establishment of new universities and cultural venues at the emergence of the Second Polish Republic in 1918 and throughout the 20th century, Kraków reaffirmed its role as a major national academic and a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Repatriation Of Poles (1944-1946)
{{Disambiguation ...
Repatriation of Poles can refer to: *Repatriation of Poles (1944–1946) *Repatriation of Poles (1955–1959) See also *Expulsion of Poles (other) Expulsion of Poles can refer to: * Expulsion of Poles by Germany in the 19th and 20th centuries * Expulsion of Poles by Nazi Germany (1939–1944) See also Polish population movements from the USSR: * Polish population transfers (1944–1946) * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polish Literature
Polish literature is the literary tradition of Poland. Most Polish literature has been written in the Polish language, though other languages used in Poland over the centuries have also contributed to Polish literary traditions, including Latin, Yiddish, Lithuanian, Russian, German and Esperanto. According to Czesław Miłosz, for centuries Polish literature focused more on drama and poetic self-expression than on fiction (dominant in the English speaking world). The reasons were manifold but mostly rested on the historical circumstances of the nation. Polish writers typically have had a more profound range of choices to motivate them to write, including past cataclysms of extraordinary violence that swept Poland (as the crossroads of Europe), but also, Poland's collective incongruities demanding an adequate reaction from the writing communities of any given period.Czesław Miłosz ''The History of Polish Literature.''Google Books preview. ''University of California Press'', Berke ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gamma Ray Burst
In gamma-ray astronomy, gamma-ray bursts (GRBs) are immensely energetic explosions that have been observed in distant galaxies. They are the most energetic and luminous electromagnetic events since the Big Bang. Bursts can last from ten milliseconds to several hours. After an initial flash of gamma rays, a longer-lived "afterglow" is usually emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, microwave and radio). The intense radiation of most observed GRBs is thought to be released during a supernova or superluminous supernova as a high-mass star implodes to form a neutron star or a black hole. A subclass of GRBs appear to originate from the merger of binary neutron stars. The sources of most GRBs are billions of light years away from Earth, implying that the explosions are both extremely energetic (a typical burst releases as much energy in a few seconds as the Sun will in its entire 10-billion-year lifetime) and extremely rare (a few per galaxy per milli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Accretion Disc
An accretion disk is a structure (often a circumstellar disk) formed by diffuse material in orbital motion around a massive central body. The central body is typically a star. Friction, uneven irradiance, magnetohydrodynamic effects, and other forces induce instabilities causing orbiting material in the disk to spiral inward towards the central body. Gravitational and frictional forces compress and raise the temperature of the material, causing the emission of electromagnetic radiation. The frequency range of that radiation depends on the central object's mass. Accretion disks of young stars and protostars radiate in the infrared; those around neutron stars and black holes in the X-ray part of the spectrum. The study of oscillation modes in accretion disks is referred to as diskoseismology. Manifestations Accretion disks are a ubiquitous phenomenon in astrophysics; active galactic nuclei, protoplanetary disks, and gamma ray bursts all involve accretion disks. These disks ver ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stellar Evolution
Stellar evolution is the process by which a star changes over the course of time. Depending on the mass of the star, its lifetime can range from a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the age of the universe. The table shows the lifetimes of stars as a function of their masses. All stars are formed from collapsing clouds of gas and dust, often called nebulae or molecular clouds. Over the course of millions of years, these protostars settle down into a state of equilibrium, becoming what is known as a main-sequence star. Nuclear fusion powers a star for most of its existence. Initially the energy is generated by the fusion of hydrogen atoms at the core of the main-sequence star. Later, as the preponderance of atoms at the core becomes helium, stars like the Sun begin to fuse hydrogen along a spherical shell surrounding the core. This process causes the star to gradually grow in size, passing throug ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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