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Bubnoff Unit
The Bubnoff unit (abbreviated B) is a unit of speed defined as 1 micron ( micrometer) per year. In other words, 1 B is equal to 1 meter in 1,000,000 years or 1 millimeter in 1 millennium. It was defined in 1969. The Bubnoff unit is employed in geology to measure rates of lowering of earth surfaces due to erosion and is named after the Russian (German-Baltic) geologist Serge von Bubnoff (1888–1957). An erosion speed of 1 B also means that 1 m3 of earth is being removed from an area of 1 km2 in 1 year. Compared to everyday phenomena, erosion is under most circumstances (excluding rapid events like landslides) an extremely slow process, calling for such a specialized unit. For instance, the current average rate of erosion over the Earth's landmasses has been estimated at 30 B (30 m in a million years). There are, however, great regional differences in erosion speed. As an extreme example, the watershed area of the Semani River in Albania Alba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micrometre
The micrometre (English in the Commonwealth of Nations, Commonwealth English as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American English), also commonly known by the non-SI term micron, is a unit of length in the International System of Units (SI) equalling (SI standard prefix "micro-" = ); that is, one millionth of a metre (or one thousandth of a millimetre, , or about ). The nearest smaller common SI Unit, SI unit is the nanometre, equivalent to one thousandth of a micrometre, one millionth of a millimetre or one billionth of a metre (). The micrometre is a common unit of measurement for wavelengths of infrared radiation as well as sizes of biological cell (biology), cells and bacteria, and for grading wool by the diameter of the fibres. The width of a single human hair ranges from approximately 20 to . Examples Between 1 μm and 10 μm: * 1–10 μm – length of a typical bacterium * 3–8 μm – width of str ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Infobase
Infobase is an American publisher of databases, reference book titles and textbooks geared towards the North American library, secondary school, and university-level curriculum markets. Infobase operates a number of prominent imprints, including Facts On File, Films for the Humanities & Sciences, Cambridge Educational, Ferguson Publishing, ''Vault Law'', Omnigraphics, and Chelsea House (which also serves as the imprint for the special collection series, "Bloom's Literary Criticism", under the direction of literary critic Harold Bloom). History Facts On File has been publishing books since 1941. It was owned by CCH from 1965 to 1993. The publisher publishes general reference and trade books. Facts On File acquired Ferguson Publishing, which specializes in career education works, in 2003. Chelsea House was founded in 1966. It is known for multi-volume reference works. The private equity firm Veronis Suhler Stevenson bought Facts on File and Chelsea House in 2005. Infobase bou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology
Geology (). is a branch of natural science concerned with the Earth and other astronomical objects, the rocks of which they are composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology. It is integrated with Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface and the processes that have shaped that structure. Geologists study the mineralogical composition of rocks in order to get insight into their history of formation. Geology determines the relative ages of rocks found at a given location; geochemistry (a branch of geology) determines their absolute ages. By combining various petrological, crystallographic, and paleontological tools, geologists are able to chronicle the geological history of the Earth as a whole. One aspect is to demonstrate the age of the Earth. Geology provides evidence for plate tectonics, the ev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Erosion
Erosion is the action of surface processes (such as Surface runoff, water flow or wind) that removes soil, Rock (geology), rock, or dissolved material from one location on the Earth's crust#Crust, Earth's crust and then sediment transport, transports it to another location where it is deposit (geology), deposited. Erosion is distinct from weathering which involves no movement. Removal of rock or soil as clastic sediment is referred to as ''physical'' or ''mechanical'' erosion; this contrasts with ''chemical'' erosion, where soil or rock material is removed from an area by Solvation, dissolution. Eroded sediment or solutes may be transported just a few millimetres, or for thousands of kilometres. Agents of erosion include rainfall; bedrock wear in rivers; coastal erosion by the sea and Wind wave, waves; glacier, glacial Plucking (glaciation), plucking, Abrasion (geology), abrasion, and scour; areal flooding; Aeolian processes, wind abrasion; groundwater processes; and Mass wastin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Serge Von Bubnoff
Sergius Nikolajewitsch von Bubnoff (15 July 1888 in Saint Petersburg – 16 November 1957 in Berlin) was a geologist and geotechnical engineer with Germano-Baltic ancestry who made important contributions to the rebuilding of geological research in East Germany after World War II. Starting in 1922, he was a professor at the University of Breslau. In 1929 he became a professor at the University of Greifswald and in 1950, he started his professorship at the Humboldt-University of Berlin. The Bubnoff unit, which is the unit of measure for the speed of geological processes, is named after him. Family Serge von Bubnoff was born in 1888 in Saint Petersburg (Russia) as the youngest son of Russian doctor, Nikolai Dementyevitch von Bubnoff (who would die a year later at the age of 52) and the German daughter of a businessman, Marie Henriette (née Türstig). His father worked as a military doctor and the personal physician of Prince Alexander von Oldenburg while his mother was an asso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landslides
Landslides, also known as landslips, rockslips or rockslides, are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, mudflows, shallow or deep-seated slope failures and debris flows. Landslides occur in a variety of environments, characterized by either steep or gentle slope gradients, from mountain ranges to coastal cliffs or even underwater, in which case they are called submarine landslides. Gravity is the primary driving force for a landslide to occur, but there are other factors affecting slope stability that produce specific conditions that make a slope prone to failure. In many cases, the landslide is triggered by a specific event (such as heavy rainfall, an earthquake, a slope cut to build a road, and many others), although this is not always identifiable. Landslides are frequently made worse by human development (such as urban sprawl) and resource exploitation (such as mining and deforestation). Land degradation frequ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drainage Basin
A drainage basin is an area of land in which all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, the drainage divide, made up of a succession of elevated features, such as ridges and hills. A basin may consist of smaller basins that merge at river confluences, forming a hierarchical pattern. Other terms for a drainage basin are catchment area, catchment basin, drainage area, river basin, water basin, and impluvium. In North America, they are commonly called a watershed, though in other English-speaking places, " watershed" is used only in its original sense, that of the drainage divide line. A drainage basin's boundaries are determined by watershed delineation, a common task in environmental engineering and science. In a closed drainage basin, or endorheic basin, rather than flowing to the ocean, water converges toward the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semani River
The Seman is a major river in western Albania. It is formed by the confluence of the rivers Devoll and Osum, a few km west of Kuçovë. It is long ( with its longest source river Devoll) and its drainage basin is . Its average discharge is . It meanders generally westwards through a flat lowland. Near Fier, the Seman receives the Gjanica from the left. It flows into the Adriatic Sea at the southern margin of the Divjakë-Karavasta National Park. Name In classical antiquity, the Seman River was known as the ''Apsus'', which is a derivative of the Indo-European root ''*ăp-'' "water, river". The Illyrian hydronym ''Apsus'', corresponds to ''Apsias'', a river name in southern Italy brought by Illyrian migrations (Iapygians The Iapygians or Apulians () were an Indo-European-speaking people, dwelling in an eponymous region of the southeastern Italian Peninsula named Iapygia (modern Apulia) between the beginning of the first millennium BC and the first century BC. The ...) in th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albania
Albania ( ; or ), officially the Republic of Albania (), is a country in Southeast Europe. It is located in the Balkans, on the Adriatic Sea, Adriatic and Ionian Seas within the Mediterranean Sea, and shares land borders with Montenegro to the northwest, Kosovo to the northeast, North Macedonia to the east and Greece to the south. With an area of , it has a varied range of climatic, geological, hydrological and morphological conditions. Albania's landscapes range from rugged snow-capped mountains in the Accursed Mountains, Albanian Alps and the Korab, Central Mountain Range, Albania#Skanderbeg Mountains, Skanderbeg, Pindus and Ceraunian Mountains, to fertile lowland plains extending from the Albanian Adriatic Sea Coast, Adriatic and Albanian Ionian Sea Coast, Ionian seacoasts. Tirana is the capital and largest city in the country, followed by Durrës, Vlorë, and Shkodër. Albania was inhabited by several List of Illyrian peoples and tribes, Illyrian tribes, among them the A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Donald Duff (geologist And Author)
Peter McLaren Donald Duff FRSE FGS (1927–1998) was a Scottish geologist and academic author. Life Duff was born in Edinburgh the son of the personnel officer to the London & North Eastern Railway. His early life was unsettled due to his father’s frequent job-related relocations. He eventually settled and his first fixed school was Edinburgh High School. A neighbour, Mary Noble FRSE, a plant pathologist, encouraged an interest in plants and agriculture, and on this basis, he entered the University of Edinburgh in 1944. However, he was called up to serve (in the Fleet Air Arm) soon thereafter and not demobbed until 1947. On his return to the University of Edinburgh, he instead decided to study geology, under Professor Arthur Holmes, graduating with a BSc in 1951. Holmes encouraged him to undertake a Ph.D., beginning by remapping Ben Hiant near Ardnamurchan. However, it was hard to surpass the original survey work by James Ernest Richey FRSE and Duff abandoned the project. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metre Per Second
The metre per second is the unit of both speed (a scalar (physics), scalar quantity) and velocity (a Vector (mathematics and physics), vector quantity, which has direction and magnitude) in the International System of Units (SI), equal to the speed of a body covering a distance of one metre in a time of one second. According to the definition of metre, is exactly \frac of the speed of light. The International System of Units, SI unit symbols are m/s, m·s−1, m s−1, or . Conversions is equivalent to: : = 3.6 kilometres per hour, km/h (exactly) : ≈ 3.2808 feet per second (approximately) : ≈ 2.2369 miles per hour (approximately) : ≈ 1.9438 knot (unit), knots (approximately) 1 feet per second, foot per second = (exactly) 1 miles per hour, mile per hour = (exactly) 1 kilometres per hour, km/h = (exactly) Relation to other measures The benz, named in honour of Karl Benz, has been proposed as a name for one metre per second. Although it has seen some suppor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
