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Andreev Bay Nuclear Accident
The Andreev Bay nuclear accident (russian: Радиационная авария в губе Андреева) took place at Soviet naval base 569 in February 1982. Andreev Bay (see :simple:Andreeva Bay, Simple English Wikipedia) is a radioactive waste repository 55 km (34 mi) northwest of Murmansk and 60 km (37 mi) from the Norway, Norwegian border, on the western shore of the Zapadnaya Litsa River, Zapadnaya Litsa (Kola Peninsula). The repository entered service in 1961. In February 1982, a Nuclear and radiation accidents and incidents, nuclear accident occurred in which radioactive water was released from a pool in building #5. Cleanup of the accident took place from 1983 to 1989. About 700,000 tonnes (770,000 tons) of highly radioactive water leaked into the Barents Sea during that time. About 1,000 people took part in the cleanup effort. Vladimir Konstantinovich Bulygin, who was in charge of the naval fleet's radiation accidents, received the Hero of the Soviet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aufeis
Aufeis, ( ), (German for "ice on top") is a sheet-like mass of layered ice that forms from successive flows of ground or river water during freezing temperatures. This form of ice is also called overflow, icings, or the Russian term, naled. The term was first used in 1859 by Alexander von Middendorff following his observations of the phenomenon in northern Siberia. When thawed, ''aufeis'' leave footprints in the form of ''aufeis'' glades or, perhaps more accurately in tundra habitats, “''aufeis'' barrens, because of the near absence of vascular plants due to ice cover during much of the growing season. Etymology Aufeis literally translates from German to “on ice”. In 1859 the Baltic German scientist and explorer Alexander von Middendorff used this term to describe his observations of the phenomenon in northern Siberia.Ashton, George D. 1986. River and lake ice engineering. Chelsea, Michigan, USA: Book Crafters, Inc. It is also called ''overflow'', ''icings'', or the Rus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Critical Mass
In nuclear engineering, a critical mass is the smallest amount of fissile material needed for a sustained nuclear chain reaction. The critical mass of a fissionable material depends upon its nuclear properties (specifically, its nuclear fission cross-section), density, shape, enrichment, purity, temperature, and surroundings. The concept is important in nuclear weapon design. Explanation of criticality When a nuclear chain reaction in a mass of fissile material is self-sustaining, the mass is said to be in a ''critical'' state in which there is no increase or decrease in power, temperature, or neutron population. A numerical measure of a critical mass is dependent on the effective neutron multiplication factor , the average number of neutrons released per fission event that go on to cause another fission event rather than being absorbed or leaving the material. When ''k'' = 1, the mass is critical, and the chain reaction is self-sustaining. A ''subcritical'' mass ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dosimeter
A radiation dosimeter is a device that measures dose uptake of external ionizing radiation. It is worn by the person being monitored when used as a personal dosimeter, and is a record of the radiation dose received. Modern electronic personal dosimeters can give a continuous readout of cumulative dose and current dose rate, and can warn the wearer with an audible alarm when a specified dose rate or a cumulative dose is exceeded. Other dosimeters, such as thermoluminescent or film types, require processing after use to reveal the cumulative dose received, and cannot give a current indication of dose while being worn. Personal dosimeters The personal ionising radiation dosimeter is of fundamental importance in the disciplines of radiation dosimetry and radiation health physics and is primarily used to estimate the radiation dose deposited in an individual wearing the device. Ionising radiation damage to the human body is cumulative, and is related to the total dose received, f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human Decontamination
Human decontamination is the process of removing hazardous materials from the human body, including chemicals, radioactive substances, and infectious material. General principle People suspected of being contaminated are usually separated by sex, and led into a decontamination tent, trailer, or pod, where they shed their potentially contaminated clothes in a strip-down room. They then enter a wash-down room where they are showered. Finally, they enter a drying and re-robing room to be issued clean clothing, a jumpsuit, or other attire. Some more structured facilities include six rooms (strip-down, wash-down and examination rooms, for each of men's and women's side as per attached drawing). Some facilities, such as Modecs, and many others, are remotely operable, and function like "human car washes". Common lathering in soap, removes external dust that may contain radioisotopes. It is advised that when lathering, effort should be made not to spread potential dust that deposite ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Starshina 2nd Stage
2nd class (russian: Старшина́ второй статьи́, Starshiná vtoroy stat'í, lit=Older second article) is a rank used by the Russian Navy and a number of former communist state. The rank is a non-commissioned officer and is equivalent to Junior sergeant in armies and air forces. Within NATO forces, the rank is rated as OR-5 and is equivalent to Petty officer second class or Petty officer in English speaking navies. Russia The rank was introduced to the Soviet Navy 2 November 1940. In the navy of the Russian Federation there are four ranks in the petty officer´s career group, which means: * * * * ; Rank insignia '' Starshina 1st stage '' Insignia OR-5 AZE NAVY.svg, (Azerbaijani Navy) Bulgaria-Navy-OR-5.svg, (Bulgarian Navy) 03-RKN-CPL.svg, (Kazakh Naval Forces) RAF N R4-Starsh2st 2010–.svg, ( Russian Navy) blank.svg, (Turkmen Naval Forces) Ukraine-Navy-OR-3.svg, ( Ukrainian Navy) blank.svg, (Uzbek River Force) See also * Ranks and rank insignia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Starshina 1st Stage
1st class (russian: Старшина́ пе́рвой статьи́, Starshiná pérvoy stat'í, lit=Older first article) is a rank used by the Russian Navy and a number of former communist state. The rank is a non-commissioned officer and is equivalent to Sergeant in armies and air forces. Within NATO forces, the rank is rated as OR-6 and is equivalent to Petty officer first class in English speaking navies. Russia The rank was introduced to the Soviet Navy 2 November 1940. In the navy of the Russian Federation there are four ranks in the petty officer´s career group, which means: * * * * ; Rank insignia '' Starshina 1st stage '' Insignia OR-6 AZE NAVY.svg, (Azerbaijani Navy) Bulgaria-Navy-OR-6.svg, (Bulgarian Navy) 04-RKN-SGT.svg, ( Kazakh Naval Forces) RAF N R6-Starsh1st 2010–.svg, ( Russian Navy) blank.svg, (Turkmen Naval Forces) Ukraine-Navy-OR-4.svg, (Ukrainian Navy) 04.UZN-CPO.svg, (Uzbek River Force) See also * Ranks and rank insignia of the Red Army 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxy-fuel Welding And Cutting
Principle of burn cutting Oxy-fuel welding (commonly called oxyacetylene welding, oxy welding, or gas welding in the United States) and oxy-fuel cutting are processes that use fuel gases (or liquid fuels such as gasoline or petrol, diesel, bio diesel, kerosene, etc) and oxygen to weld or cut metals. French engineers Edmond Fouché and Charles Picard became the first to develop oxygen- acetylene welding in 1903. Pure oxygen, instead of air, is used to increase the flame temperature to allow localized melting of the workpiece material (e.g. steel) in a room environment. A common propane/air flame burns at about , a propane/oxygen flame burns at about , an oxyhydrogen flame burns at and an acetylene/oxygen flame burns at about . During the early 20th century, before the development and availability of coated arc welding electrodes in the late 1920s that were capable of making sound welds in steel, oxy-acetylene welding was the only process capable of making welds of exce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aerosol
An aerosol is a suspension of fine solid particles or liquid droplets in air or another gas. Aerosols can be natural or anthropogenic. Examples of natural aerosols are fog or mist, dust, forest exudates, and geyser steam. Examples of anthropogenic aerosols include particulate air pollutants, mist from the discharge at hydroelectric dams, irrigation mist, perfume from atomizers, smoke, steam from a kettle, sprayed pesticides, and medical treatments for respiratory illnesses. When a person inhales the contents of a vape pen or e-cigarette, they are inhaling an anthropogenic aerosol. The liquid or solid particles in an aerosol have diameters typically less than 1 μm (larger particles with a significant settling speed make the mixture a suspension, but the distinction is not clear-cut). In general conversation, ''aerosol'' often refers to a dispensing system that delivers a consumer product from a can. Diseases can spread by means of small droplets in the breath, so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heat-only Boiler Station
A heating plant, also called a physical plant, or steam plant, generates thermal energy in the form of steam for use in district heating applications. Unlike combined heat and power installations which produce thermal energy as a by-product of electricity generation, heating plants are dedicated to generating heat for use in various processes. Heating plants are commonly used at hospital or university campuses, military bases, office tower complexes, and public housing complexes. The plant will generate steam which is distributed to each building where it is used to make domestic hot water for human consumption, heating hot water in the case of hydronic heating systems, air conditioning through the use of absorption refrigeration units, air heating in HVAC units, humidification, industrial laundry systems, or sterilization at hospitals. The steam may be sold to each customer and billed through the use of a steam flow meter. They feature boilers, either water tube or fire tu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthquake
An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from those that are so weak that they cannot be felt, to those violent enough to propel objects and people into the air, damage critical infrastructure, and wreak destruction across entire cities. The seismic activity of an area is the frequency, type, and size of earthquakes experienced over a particular time period. The seismicity at a particular location in the Earth is the average rate of seismic energy release per unit volume. The word ''tremor'' is also used for non-earthquake seismic rumbling. At the Earth's surface, earthquakes manifest themselves by shaking and displacing or disrupting the ground. When the epicenter of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neutron
The neutron is a subatomic particle, symbol or , which has a neutral (not positive or negative) charge, and a mass slightly greater than that of a proton. Protons and neutrons constitute the nuclei of atoms. Since protons and neutrons behave similarly within the nucleus, and each has a mass of approximately one atomic mass unit, they are both referred to as nucleons. Their properties and interactions are described by nuclear physics. Protons and neutrons are not elementary particles; each is composed of three quarks. The chemical properties of an atom are mostly determined by the configuration of electrons that orbit the atom's heavy nucleus. The electron configuration is determined by the charge of the nucleus, which is determined by the number of protons, or atomic number. The number of neutrons is the neutron number. Neutrons do not affect the electron configuration, but the sum of atomic and neutron numbers is the mass of the nucleus. Atoms of a chemical element t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
