Effect of Spherical Ni Powder on Microstructure of Secondary Carbon in MgO-C Refractories Matrix

In order to tackle the shortcomings of high brittleness,hard graphitization,and poor oxidation resistance resulted from carbonization of phenolic resin of Mg O- C refractories, effects of 2 mass% spherical Ni, and2 mass% spherical Ni plus 7. 5 mass% Al composite powder on microstructure of the secondary carbon in Mg O- C refractories matrix were investigated. The results show that a large number of carbon whiskers form after the carbonization of phenolic resin with Ni powder;in the Mg O- C refractories matrix with only Ni powder,the carbon microspheres form at all treatment temperatures and change slightly with the temperature rising;the carbon whiskers begin to generate in the specimens with composite powder at 1 000 ℃,the diameter of the carbon whiskers is about 0. 4- 0. 5 μm,and the length is about 3- 4 μm,and the formed carbon whiskers increase gradually with the temperature rising.     

Enhanced activity and stability of Cu-Mn and Cu-Ag catalysts supported on nanostructured mesoporous CeO2 for CO oxidation

Cu, Mn and Ag nanoparticles are loaded on nanostructured mesoporous CeO2 as catalysts for CO oxidation. The Cu/CeO2 catalyst exhibits an obvious deactivation after the stability test at 95 degrees C for 60 h. This is caused by carbon deposition as confirmed by FTIR spectroscopy, Raman spectroscopy and thermogravimetry-differential scanning calorimetry-mass spectroscopy (TG-DSC-MS) analysis. It is found that the Cu-Mn or Cu-Ag binary metal catalysts supported on the nanostructured CeO2 exhibit much improved activity and stability in CO oxidation. In ease case, carbon deposition is absent in the similar stability test, due to enhanced oxygen adsorption property.     

Corrective Plate With a Gradient Index Media in the Catadioptiric System

1IntroductionIthasbeenprovedthataradialgradientindexmediaplatehasthesameeffectasalens"'..Whenthethicknessoftheplateisextremelyhigh,andtheradiusisverysmall,itcanbeconsideredasanopticalwaveguide.Ithasalsobeenprovedthatalaminategradientindexmediaplatehassome…     

Control rod drive for high temperature gas cooled reactor

This control rod drive is developed for HTR-10 high temperature gas cooled test reactor.The stepmotor is prefered to improve positioning of the control rod and the scram behavior.The preliminary test in 1600170 ambient temperature shows that the selected stepmotor and transmission system can meet the main operation function requirements of HTR-10.     

Synthesis of highly concentrated,carrier free ^188Re—mercaptoacetyltriglycine

Chelation of ^188Re to compounds such as MAG3 will further reduce the radiation dose to the patient in case of balloon rupture through the rapid excretion from the body.In order to prepae highly concentrated,carrier free ^188Re-MAG3,Sbenzoyl mercaptoacetyltriglycine(S-Bz-MAG3) was synthesized.labeled with carrier free ^188Re.the overall yield of S-Bz-MAG3 is higher than those published in the literature,Dependence of the labeling yield of ^188Re-MAG3 upon concentrations of reducing agent,pH,reaction time,etc.was examined and optimum conditions were confirmed.The concentration procedure was succeeded with Sep-Pak C18 cartridge to obtain highly concentrated ^188Re-MAG3.In the case of optimun conditions.the labeling yield of 188Re-MAG3 was more than 98%.Radiochemical purity of ^188ReMAG3 was more than 92% after 24 hour storage at room temperature.     

Synthesis,labelling and animal experiments of the derivative of phenylpentadecanoic acid（CACPPA）

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内孔镀铬挂具的设计与应用

介绍了一种内孔镀铬挂具的设计，改变了常规设计模式，简化了挂具结构，开发了塑料布在绝缘装置上的应用。     

Effects of Fiber Volume Fraction on Transverse Tensile Properties of SiC/Ti-6Al-4V Composites

采用有限元法分析了在残余应力和外加横向载荷作用下纤维体积分数对SiC/Ti-6Al-4V复合材料横向拉伸行为的影响。通过弹簧连接纤维与基体界面的重合节点来模拟界面脱粘。结果表明,在界面结合强度一定时,界面脱粘应力(对应于应力-应变曲线上应变的跳跃)受0°方向界面径向残余应力影响较大;在界面脱粘先于基体屈服时,复合材料失效应力(对应于应力-应变曲线上的水平部分)主要取决于纤维体积分数,且体积分数越低,失效应力越高。