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Djordje Stanojević
Djordje M. Stanojević also spelled Đorđe Stanojević (7 April 1858–24 December 1921) was a Serbian physicist, astronomer and professor and rector at the University of Belgrade. He is credited with the introduction of the first electric lighting and the construction of the first Teslian polyphase hydroelectric power plants in Serbia. Biography He was born on 7 April 1858 in Negotin, where he finished four grades of elementary school and a four-grade lower high school. He finished the upper grades of the grammar school in Belgrade, then in 1877, he enrolled in the Department of Natural Sciences and Mathematics at the Faculty of Philosophy in Belgrade. In those years, as a high school student, he wrote his first professional works. In 1881, he graduated from the Grande école in Belgrade and Professor Kosta Alković kept him as an assistant trainee at the Department of Physics. In the same year, he was in Paris for the first international exhibition on electricity. He remain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Negotin
Negotin ( sr-cyrl, Неготин, ; ) is a town and municipality located in the Bor District of Southern and Eastern Serbia, eastern Serbia. It is situated near the borders between Serbia, Romania and Bulgaria. It is the judicial center of the Bor District. The population of the town is 14,647, while the municipality has a population of 28,261 (2022 census). History Name The etymology of the town's name is unclear, and there are a few possibilities as to its background: # The Romance languages, Romance name origin thesis, such as the ''merchant place'' (cf. Romanian "negoț" or Spanish "negocios"), and the fact that Negotin is in a region with the presence of a significant Romanians, Romanian minority, similar to its namesake Negotino in North Macedonia with an Aromanians, Aromanian presence. # There is also the Slavonic languages, Slavonic origin hypothesis:, Proto-Slavonic "''něga''" (нѣгa) means "care" and the suffix "-ota//-otina" means "the action undergone or carried o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Max Planck Institute For Meteorology
The Max Planck Institute for Meteorology (''Max-Planck-Institut für Meteorologie''; MPI-M) is an internationally renowned institute for climate research. Its mission is to understand Earth's changing climate. Founded in 1975, it is affiliated with the Max Planck Society and the University of Hamburg, and is based in Hamburg's district of Eimsbüttel. Its founding director was the Nobel laureate Klaus Hasselmann. The current managing director is Bjorn Stevens. Organization and Research The MPI-M comprises three departments and hosts independent research groups. They also conduct work with national and international partners. Departments: * Climate Physics - investigates how water in the atmosphere, on the land surface, and as exchanged with the ocean, influences Earth’s climate, and its response to perturbations * Climate Dynamics - aims to understand global climate dynamics with a focus on exploring the mechanisms that govern large-scale climate change patterns across var ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Belgrade
Belgrade is the Capital city, capital and List of cities in Serbia, largest city of Serbia. It is located at the confluence of the Sava and Danube rivers and at the crossroads of the Pannonian Basin, Pannonian Plain and the Balkan Peninsula. The population of the Belgrade metropolitan area is 1,685,563 according to the 2022 census. It is one of the Balkans#Urbanization, major cities of Southeast Europe and the List of cities and towns on the river Danube, third-most populous city on the river Danube. Belgrade is one of the List of oldest continuously inhabited cities, oldest continuously inhabited cities in Europe and the world. One of the most important prehistoric cultures of Europe, the Vinča culture, evolved within the Belgrade area in the 6th millennium BC. In antiquity, Thracians, Thraco-Dacians inhabited the region and, after 279 BC, Celts settled the city, naming it ''Singidunum, Singidūn''. It was Roman Serbia, conquered by the Romans under the reign of Augustus and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
French Academy Of Sciences
The French Academy of Sciences (, ) is a learned society, founded in 1666 by Louis XIV at the suggestion of Jean-Baptiste Colbert, to encourage and protect the spirit of French Scientific method, scientific research. It was at the forefront of scientific developments in Europe in the 17th and 18th centuries, and is one of the earliest Academy of Sciences, Academies of Sciences. Currently headed by Patrick Flandrin (President of the academy), it is one of the five Academies of the . __TOC__ History The Academy of Sciences traces its origin to Colbert's plan to create a general academy. He chose a small group of scholars who met on 22 December 1666 in the King's library, near the present-day Bibliothèque nationale de France, Bibliothèque Nationale, and thereafter held twice-weekly working meetings there in the two rooms assigned to the group. The first 30 years of the academy's existence were relatively informal, since no statutes had as yet been laid down for the ins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astrophysics
Astrophysics is a science that employs the methods and principles of physics and chemistry in the study of astronomical objects and phenomena. As one of the founders of the discipline, James Keeler, said, astrophysics "seeks to ascertain the nature of the heavenly bodies, rather than their positions or motions in space—''what'' they are, rather than ''where'' they are", which is studied in celestial mechanics. Among the subjects studied are the Sun ( solar physics), other stars, galaxies, extrasolar planets, the interstellar medium, and the cosmic microwave background. Emissions from these objects are examined across all parts of the electromagnetic spectrum, and the properties examined include luminosity, density, temperature, and chemical composition. Because astrophysics is a very broad subject, ''astrophysicists'' apply concepts and methods from many disciplines of physics, including classical mechanics, electromagnetism, statistical mechanics, thermodynamics, quantum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sahara
The Sahara (, ) is a desert spanning across North Africa. With an area of , it is the largest hot desert in the world and the list of deserts by area, third-largest desert overall, smaller only than the deserts of Antarctica and the northern Arctic. The name "Sahara" is derived from , a broken plural form of ( ), meaning "desert". The desert covers much of North Africa, excluding the fertile region on the Mediterranean Sea coast, the Atlas Mountains of the Maghreb, and the Nile, Nile Valley in Egypt and the Sudan. It stretches from the Red Sea in the east and the Mediterranean in the north to the Atlantic Ocean in the west, where the landscape gradually changes from desert to coastal plains. To the south it is bounded by the Sahel, a belt of Tropical and subtropical grasslands, savannas, and shrublands, semi-arid tropical savanna around the Niger River valley and the Sudan (region), Sudan region of sub-Saharan Africa. The Sahara can be divided into several regions, including ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Infrared
Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves. The infrared spectral band begins with the waves that are just longer than those of red light (the longest waves in the visible spectrum), so IR is invisible to the human eye. IR is generally (according to ISO, CIE) understood to include wavelengths from around to . IR is commonly divided between longer-wavelength thermal IR, emitted from terrestrial sources, and shorter-wavelength IR or near-IR, part of the solar spectrum. Longer IR wavelengths (30–100 μm) are sometimes included as part of the terahertz radiation band. Almost all black-body radiation from objects near room temperature is in the IR band. As a form of EMR, IR carries energy and momentum, exerts radiation pressure, and has properties corresponding to both those of a wave and of a particle, the photon. It was long known that fires e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thermal Radiation
Thermal radiation is electromagnetic radiation emitted by the thermal motion of particles in matter. All matter with a temperature greater than absolute zero emits thermal radiation. The emission of energy arises from a combination of electronic, molecular, and lattice oscillations in a material. Kinetic energy is converted to electromagnetism due to charge-acceleration or dipole oscillation. At room temperature, most of the emission is in the infrared (IR) spectrum, though above around 525 °C (977 °F) enough of it becomes visible for the matter to visibly glow. This visible glow is called incandescence. Thermal radiation is one of the fundamental mechanisms of heat transfer, along with conduction and convection. The primary method by which the Sun transfers heat to the Earth is thermal radiation. This energy is partially absorbed and scattered in the atmosphere, the latter process being the reason why the sky is visibly blue. Much of the Sun's radiation tra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Eclipses
A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby obscuring the view of the Sun from a small part of Earth, totally or partially. Such an alignment occurs approximately every six months, during the eclipse season in its new moon phase, when the Moon's orbital plane is closest to the plane of Earth's orbit. In a total eclipse, the disk of the Sun is fully obscured by the Moon. In partial and annular eclipses, only part of the Sun is obscured. Unlike a lunar eclipse, which may be viewed from anywhere on the night side of Earth, a solar eclipse can only be viewed from a relatively small area of the world. As such, although total solar eclipses occur somewhere on Earth every 18 months on average, they recur at any given place only once every 360 to 410 years. If the Moon were in a perfectly circular orbit and in the same orbital plane as Earth, there would be total solar eclipses once a month, at every new moon. Instead, because the Moon's orbit is t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petrovsk, Saratov Oblast
Petrovsk (; ) is a town in Saratov Oblast, Russia, located on the Medveditsa River (left tributary of the Don) northwest of Saratov, the administrative center of the oblast. It had a population of History Petrovsk is an old merchant city, founded by the personal decree of Peter the Great in 1698 to protect the region from the raids of the Crimean Tatars, and also "so that from now on, free people do not come to the roundabout cities and do not repair any ruin ...". According to legend, the founder personally visited the city in 1707. The construction of the Petrovsk fortress was of great importance for its time, since a land road from Tsaritsyn to Moscow lay from Saratov through Atkarsk and Penza, and the sparsely populated banks of the Medveditsa abounded with robber bands that robbed those who passed along the road. A fortified guard line with settlements began from Petrovsk. The fortress itself had a 4-sided shape, it was surrounded by double oak walls with 8 towers covere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pulkovo Observatory
The Pulkovo Astronomical Observatory (), officially named the Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo, is the principal astronomical observatory of the Russian Academy of Sciences. It is located 19 km south of Saint Petersburg on Pulkovo Heights above sea level. It is part of the UNESCO World Heritage Site Historic Centre of Saint Petersburg and Related Groups of Monuments. It was formerly known as the Imperial Observatory at Pulkowo. Early years The observatory was opened in 1839. Originally, it was a brainchild of the German/Russian astronomer Friedrich Georg Wilhelm von Struve, who would become its first director (in 1861, his son Otto Wilhelm von Struve succeeded him). The architect was Alexander Bryullov. The observatory was equipped with state-of-the-art devices, one of them being the a aperture refractor, one of the largest refractors in the world at that time (see Great Refractor). In 1885, the observatory was equipped wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Greenwich Observatory
The Royal Observatory, Greenwich (ROG; known as the Old Royal Observatory from 1957 to 1998, when the working Royal Greenwich Observatory, RGO, temporarily moved south from Greenwich to Herstmonceux) is an observatory situated on a hill in Greenwich Park in south east London, overlooking the River Thames to the north. It played a major role in the history of astronomy and navigation, and because the Prime Meridian passed through it, it gave its name to Greenwich Mean Time, the precursor to today's Coordinated Universal Time (UTC). The ROG has the IAU observatory code of 000, the first in the list. ROG, the National Maritime Museum, the Queen's House and the clipper ship '' Cutty Sark'' are collectively designated Royal Museums Greenwich. The observatory was commissioned in 1675 by King Charles II, with the foundation stone being laid on 10 August. The old hilltop site of Greenwich Castle was chosen by Sir Christopher Wren, a former Savilian Professor of Astronomy; as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
