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2016 Tungsten Concentrate: Stable But Slightly Tight Supply, Demand Gradually Recovers, Price Bottoms Up
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《China Nonferrous Metals Monthly》 2017年第4期1-4,共4页
In 2016,China’s tungsten concentrate output declined,domestic and foreign downstream enterprises’tungsten raw material stocks were at a historical low,and the current market supply is stable but slightly tight;outpu... In 2016,China’s tungsten concentrate output declined,domestic and foreign downstream enterprises’tungsten raw material stocks were at a historical low,and the current market supply is stable but slightly tight;output of carbide alloy and other downstream products increased,while that of some elementary 展开更多
关键词 down Demand Gradually Recovers Price Bottoms Up Stable But Slightly Tight Supply tungsten Concentrate high THAN
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Calculation of hydrogen and helium concentrations for CSNS target 被引量:1
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作者 潘冬冬 梁泰然 +1 位作者 殷雯 姚泽恩 《Chinese Physics C》 SCIE CAS CSCD 2016年第3期140-146,共7页
The China Spallation Neutron Source(CSNS) is driven by protons whose energies are about 1.6 GeV.At such high energies, the spallation neutrons lead to the formation of large amounts of helium, hydrogen and new heavi... The China Spallation Neutron Source(CSNS) is driven by protons whose energies are about 1.6 GeV.At such high energies, the spallation neutrons lead to the formation of large amounts of helium, hydrogen and new heavier species in the form of transmutation products. These hydrogen, helium and transmutation products have a critical effect on the mechanical properties on the one hand and exacerbate the displacement radiation damage on the other hand. In this paper, the background hydrogen/helium concentrations and the maximum hydrogen/helium concentrations near cracks in a tungsten target for CSNS have been calculated at temperatures of 100 and 300 by applying a theoretical model. For the CSNS tungsten target plate, we find the maximum hydrogen concentration near the tips of cracks ranges from 3.0×10^(-2)–2×10^(-1), which exceeds the hydrogen background concentration by 1.2–1.8 times; the maximum helium concentration near the tips of cracks ranges from 3.0×10^(-4)- 1.2×10^(-3), which exceeds the helium background concentration by 2- 4 times; the maximum hydrogen/helium concentration increases with the increase of the transfer length across the surfaces of the target and it decreases with the increase of temperature. 展开更多
关键词 CSNS hydrogen concentration helium concentration tungsten target
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