Berkelium Element Facts - Atomic Number 97 or Bk

Berkelium is one of the radioactive synthetic elements made in the cyclotron at Berkeley, California and the one that honors the work of this lab by bearing its name. It was the fifth transuranium element discovered (following neptunium, plutonium, curium, and americium). Heres a collection of facts about element 97 or Bk, including its history and properties: Element Name Berkelium Atomic Number 97 Element Symbol Bk Atomic Weight 247.0703 Berkelium Discovery Glenn T. Seaborg, Stanley G. Thompson, Kenneth Street, Jr., and Albert Ghiorso produced berkelium in December 1949 at the University of California, Berkeley (United States). The scientists bombarded americium-241 with alpha particles in a cyclotron to yield berkelium-243 and two free neutrons. Berkelium Properties Such a small quantity of this element has been produced that very little is known about its properties. Most of the available information is based on predicted properties, based on the elements location on the periodic table. It is a paramagnetic metal and has one of the lowest bulk modulus  values of the actinides. Bk3 ions are fluorescent at 652 nanometers (red) and 742 nanometers (deep red). Under ordinary conditions, berkelium metal assumes hexagonal symmetry, transforming to a face-centered cubic structure under pressure at room temperature, and an orthorhombic structure upon compression to 25 GPa. Electron Configuration [Rn] 5f9  7s2 Element Classification Berkelium is a member of the actinide element group or transuranium element series. Berkelium Name Origin Berkelium is pronounced as  BURK-lee-em. The element is named after Berkeley, California, where it was discovered. The element californium is also named for this lab. Density 13.25 g/cc Appearance Berkelium has a traditional shiny, metallic appearance. It is a soft, radioactive solid at room temperature. Melting Point The melting point of berkelium metal is  986  Ã‚ °C. This value is below that of neighbor element curium  (1340  Ã‚ °C), but higher than that of californium  (900  Ã‚ °C). Isotopes All of the isotopes of berkelium are radioactive. Berkelium-243 was the first isotope to be produced. The most stable isotope is berkelium-247, which has a half-life of 1380 years, eventually decaying into americium-243 via alpha decay. About 20 isotopes of berkelium are known. Pauling Negativity Number 1.3 First Ionizing Energy The first ionizing energy is predicted to be about 600 kJ/mol. Oxidation States The most common oxidation states of berkelium are 4 and 3. Berkelium Compounds Berkelium chloride (BkCl3) was the first Bk compound produced in sufficient quantity to be visible. The compound was synthesized in 1962 and weighed approximately 3 billionths of a gram. Other compounds which have been produced and studied using x-ray diffraction include berkelium oxychloride, berkelium fluoride (BkF3), berkelium dioxide (BkO2), and berkelium trioxide (BkO3). Berkelium Uses Since so little berkelium has ever been produced, there are no known uses of the element at this time aside from scientific research. Most of this research goes toward the synthesis of heavier elements. A 22-milligram sample of berkelium was synthesized at Oak Ridge National Laboratory and was used to make element 117 for the first time, by bombarding the berkelium-249 with calcium-48 ions at the Joint Institute for Nuclear Research in Russia. The element does not occur naturally, so additional samples must be produced in a lab. Since 1967, just over 1 gram of berkelium has been produced, in total. Berkelium Toxicity The toxicity of berkelium has not been well-studied, but its safe to assume it presents a health hazard if ingested or inhaled, due to its radioactivity. Berkelium-249 emits low-energy electrons and is reasonably safe to handle. It decays in alpha-emitting californium-249, which remains relatively safe for handling, but does result in free-radical production and self-heating of the sample. Berkelium Fast Facts Element Name: BerkeliumElement Symbol: BkAtomic Number: 97Appearance: Silvery metalElement Category: ActinideDiscovery: Lawrence Berkeley National Laboratory (1949) Sources Emsley, John (2011). Natures Building Blocks: An A-Z Guide to the Elements. New York, NY: Oxford University Press. ISBN 978-0-19-960563-7.Peterson, J. R.; Fahey, J. A.; Baybarz, R. D. (1971). The crystal structures and lattice parameters of berkelium metal. J. Inorg. Nucl. Chem. 33 (10): 3345–51. doi:10.1016/0022-1902(71)80656-5Thompson, S.; Ghiorso, A.; Seaborg, G. (1950). The New Element Berkelium (Atomic Number 97). Physical Review. 80 (5): 781. doi:10.1103/PhysRev.80.781Thompson, Stanley G.; Seaborg, Glenn T. (1950). Chemical Properties of Berkelium. OSTI Technical Report doi:10.2172/932812

Walt Disney Company’s Yen Financing Case Essay - 4601 Words

Introduction: The Walt Disney Company is the largest media conglomerate in the world and is headquartered in Burbank, California, USA. It was established by Walt and Roy Disney in 1923. Since its inception, Disney has grown vastly so that operational areas now include theme parks, motion pictures, television dramas and consumer products. In 1955, the most charming place in the world was ‘Disneyland’ was open for the public. The idea was to create a magical place for the whole family. Ever since then, Disneyland theme parks have been growing and today Walt Disney Company owns 14 theme parks in the world. In Film Industry, Disney mainly focused on children; however the films produced by Disney under touchstone label were focused†¦show more content†¦And the ratio of debt to total capitalization jumped from 20% to 43%. Japanese Royalties Situation With the opening of Tokyo Disneyland in April 1983 and the inflow of yen royalty receipts, the Walt Disney want to increase the assets and decrease debt, they realized they had an opportunity to use the yen royalties from Japan to pay down some of their debt: * In 1984 the average exchange rate is 347.30 JPY/US$ * The royalties of Disneyland Tokyo of JPY 8 billion was equivalent to US $ 33,712,600 * This represents 11.58% (=33,712,600 / 291,033,000) of 1984 operating income before corporate expenses, a percentage which is more common to grow, since Disney itself will probably not grow as rapidly as its JPY royalties * In Figure 5, only 21.47% of all debts has a maturity greater than 2 years * The JPY has also depreciated to disrupt Disney’s financial plan for its large, long-term construction, expansion, production, and development. * Disney transferred Yen to USD from the 2nd quarter of 1984 through the first quarter of 1985, because the JPY recei pts are a huge amount of money. * However, it has appreciated in the quarter since then. 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Career Episode †Civil Free Essays

Career Episode 3 a) Introduction This career episode describes my working activity from September till October 2xxx. I was working as a group leader at the design of water-supply and sewerage works and networks of the FFF Bauxite Mine and of a town situated in Komi Autonomous Republic. b) Background. We will write a custom essay sample on Career Episode – Civil or any similar topic only for you Order Now After reviewing the background data I had to define water-supply sources, to calculate water consumption for domestic, industrial and fire safety purposes of the mine industrial area and the town. I also had to estimate sewage runoff and to select appropriate water and sewerage works. I had to foresee the measures devoted to environmental protection. As usual I closely collaborated with relative specialists- prospecting specialists, electrical engineers, water engineers and metallurgical specialists. For this design I carried out all the necessary calculations, developed the principal main water-supply and sewerage works schemes, water consumption and water removal balance schemes. All the calculations were carried out on a computer. While I was working on the project I took part in the negotiations with the customer, where we discussed the engineering and environmental protection problems. After completing my work I gave the explanatory note to my customer for approval. c) Personal workplace activity. For this design I studied a lot of materials which contained the information about hydrological, geological and climatic parameters of the designed industrial site area. I analysed accounts of preliminary and detailed groundwater prospecting for household water-supply. The careful study of this information made it possible for me to offer the disposition of water-intake works ( artesian wells ) not at the place recommended at the reliminary prospecting. That fact excluded the possibility of chemical and bacterial contamination of the water supply source. I carried out the calculations of water consumption for domestic, industrial and fire safety needs. On the basis of these calculations I developed the water-supply scheme. This scheme was as follows: Water from the water-intake wells is distributed by the pumps to the regulating reservoirs intended for the water collectin g before the pumping station of the second raising. The pumps at the pumping station of the second raising discharge water from the regulating reservoirs to the reservoirs where fire-proof, emergency and controlling reserve of water is kept. From the reservoirs the water flows under gravity to the circular network. I made provision for a special installation of the regulating valves with the electric drive in the wells near the tanks in order to pass the fire safety reserve of water. In this project I made an important decision regarding environmental protection. I offered to disinfect potable water at the bactericidal plants. Besides, I foresaw the reserved disinfection of water with the solution of natrium hypochlorite obtained from the solution of salt in the electrolyses. For this design we (my group under my direction) worked out the borders of sanitary protection zones for water-supply sources and water storage tanks. We kept in view the further development of our object. We also included all the sanitary steps around the zone territory according to the construction standards and rules. On the industrial areas of the mine I designed the recycling water supply systems for a diesel power station, for a crushed stone factory and for a car-washer. I estimated and selected the following works and networks of the recycling water supply systems: recycling water-supply pumping stations, water-cooling towers, car-washer sewage water treatment plants, recycling water pipe-lines. These recycling water supply systems allowed to reduce fresh water consumption. The recycling water supply systems make 92 percent of the whole mine water-supply in this design. I also calculated the following sewerage systems: household, industrially-storm and industrial ones. For the household sewerage system I estimated and selected sewerage pumping stations, domestic sewage treatment plants, sewerage networks. At the disposal works waste water passes step by step the intake chamber, the racks, the grit catchers and then enters the mixing chamber. The aluminium sulphate solution and chlorine water are fed there to improve oxidising of ammonia nitrogen. Then sewage enters the sedimentation tank, where settling takes place to separate the main part of pollutants. In order to remove residual organic pollutants and unsettled suspended matter the further sewage treatment goes on by the oxidation on the surface of the pores filter bed. Treated sewage water enters the contact chamber for the disinfection. In my explanatory note I gave the description of all the sewerage works and represented the tables of pollutants concentrations in household sewage before and after the purification. I also represented the results of the suspended matter and biological oxygen demand ( BOD ) sewage purification degree design taking into account the process of the mixing with water of the river, in which sewage is discharged after purification. Disposal works which I have selected ensure household sewage purification up to the maximum concentration limits that in turn permit to discharge sewage into basins important for fish industry. I also made provision for storm water treatment. Storm water full of black oil from the territory of lubricating materials storehouse, from a car park and garage, sewage from the repair shops enter the storm water treatment plants. Here sedimentation and purification take place on the filters. After purification storm water isn’t discharged into the basin but it is utilised in the hydraulic ash removal system of the boiler house and partly used to fill the recycling water supply systems of HPP ( heating power plant ). I also designed the second sewage utilisation for the industrial sewerage system. Sewage from the hydro-washing of the floors of crushed stone factory and of grinding-sorting factory enters the pumping station and then the sewage flows to the ash dump of HPP to fill the recycling water supply systems. In this project I had to solve the problem of the FFF bauxite mine quarry water treatment working together with the water engineer and the specialist of our institute scientific research department. I provided for the sewage treatment and the sewage discharge into the river belonging to the fish-industry basins of the extra quality, where the pollutants content was carefully controlled by the present legislation. The mine quarry water is a mixture of treated industrial water and water pumped from the mine underground roadways. The water is generally polluted by the suspended matter and the oil products. First the quarry water flows into the sedimentation tank. In the sedimentation tank the averaging of seasonal movements of water consumption and the partial suspended matter sedimentation takes place. To achieve the required purification degree I developed the process flow sheet with the reagent water treatment and the following filtration. The flow sheet includes: The suspended matter treatment in the sedimentation tank with natrium aluminate as a coagulant. Filtration. The pollutants content after the purification meets the specifications of the maximum permissible concentrations of the controlled components for fishing basins. To achieve the required purification degree I provided for the centralised control of the process, the automatic adjustment of the parameters and the analytic control of the quality of influents and effluents. To ensure reliable work and optimal sanitary-engineering conditions all the reservoirs equipment is provided by the special devices. These devices give warning signals if the limiting value is achieved. All the equipment and all the pipe-lines which are exposed to the aggressive medium acting are protected by the special corrosion proof coverage. d) Summary. In this design many tasks and problems were accomplished. They are closely connected with water-supply, water draining, sewage treatment, environmental protection of the designed object. Developing this design, I managed to apply all my knowledge and skills of a construction engineer. The design was approved and co-ordinated by the customer. How to cite Career Episode – Civil, Papers