化学还原新体系制备负载Ni-B非晶态催化剂及其催化加氢性能

化学还原新体系制备负载Ni-B非晶态催化剂及其催化加氢性能;共还原剂;非晶态合金;催化加氢     

padc-pd催化剂的制备及对heck反应的催化性能

padc;钯;负载型催化剂;heck反应     

Thermal conductivity of dielectric nanowires with different cross-section shapes

Non-equilibrium molecular dynamics simulations have been performed to investigate the effect of the cross-section shape on the thermal conductivity of argon nanowires. Some typical cross-section shapes, such as triangle, square, pentagon, hexagon and circle, are carefully explored. The simulation results show that with the same cross-sectional area of the regular polygons, the thermal conductivities decrease with the reduction of the sides of the polygons, and the thermal conductivity of the circular nanowire is larger than those of the other polygonal ones. Phonon gas kinetic theory is used to analyse the phonon transport in nanowires, and the concept of equivalent diameter is proposed to illustrate the characteristic dimension of the none-circular cross-section.     

Effects of a liquid lithium curtain as the first wall in a fusion reactor plasma

This paper explores the effect of a liquid lithium curtain on fusion reactor plasma, such curtain is utilized as the first wall for the engineering outline design of the Fusion Experimental Breeder （FEB-E）. The relationships between the surface temperature of a liquid lithium curtain and the effective plasma charge, fuel dilution and fusion power production have been derived. Results indicate that under normal operation, the evaporation of liquid lithium does not seriously affect the effective plasma charge, but effects on fuel dilution and fusion power are more sensitive. As an example, it has investigated the relationships between the liquid lithium curtain flow velocity and the rise of surface temperature based on operation scenario II of the FEB-E design with reversed shear configuration and high power density. Results show that even if the liquid lithium curtain flow velocity is as low as 0.5 m/s, the effects of evaporation from the liquid lithium curtain on plasma are negligible. In the present design, the sputtering of liquid lithium curtain and the particle removal effects of the divertor are not yet considered in detail. Further studies are in progress, and in this work implication of lithium erosion and divertor physics on fusion reactor operation are discussed.[第一段]     

有序介孔碳CMK-3微波负载NiO及其电容性能研究

微波法负载具有简便、快速、均匀的优点. 本文尝试以乙二醇为还原剂, Ni(Ac)₂为Ni源, 通过微波辐射负载及低温空气煅烧在CMK-3上形成NiO. 对样品进行X射线衍射(XRD)、透射电子显微镜(TEM)、N₂吸脱附等结构表征及循环伏安(CV)等电化学性能测试. 结果显示, 微波法并经低温空气煅烧后有序介孔碳CMK-3的小角XRD峰强度变弱、比表面积下降、孔容减小, 但却使其比电容从229.3 F/g提高到295.9 F/g, 大于文献报导中介孔碳负载MnO₂, RuO₂•xH₂O后的比电容值. 由此说明微波法是有效的负载方法, 具有较好的应用前景.     

对-叔丁基杯[4]芳烃衍生物自组装分子在声表面波传感器中检测有机磷

杯芳烃;自组装;分子印迹;声表面波传感器;甲基膦酸二甲酯;沙林;检测     

负载苯基荧光酮纤维富集-GFAAS法测定痕量锗

苯基荧光酮;负载纤维;富集;石墨炉原子吸收;锗     

Energy Spectrum of La3Lu2Ga3O12：Cr^3＋ and Its Pressure-Induced R-Line-Shift Reversal

By means of both the theory for pressure-induced Shifts （PS） of energy spectra and the theory for shifts of energy spectra due to electron-phonon interaction （EPI）, the normal-pressure energy spectra of α and β centers of Cr^3＋ ions for LLGG：Cr^3＋ and the PS＇s of R1 lines and U band of these centers have been calculated at 10 K, respectively. The total calculated results are in very good agreement with the experimental data. For LLGG：Cr^3＋, the pressureinduced low-high crystal-field transition and the reversal of R1-line PS take place. The pressure-dependent variation of Rmix^ei （2E - 4T2） [mixing-degree of （t2^2 （^3T1）e^4T2） and （t2^3 E） base-wavefunctions in the wavefunction of R1 state without EPI] plays a key role for the reversal of R1-line PS. The behavior of the pure electronic PS of R1 line is quite different from that of the PS of R1 line due to EPI. It is the combined effect of them that gives rise to the total PS of R1 line. The comparison between R1-line PS＇s of GSGG：Cr^3＋ and LLGG：Cr^3＋ has been made. It is found that a peak of R1-line PS appears at Rmix^ei （^2E - ^4T2） ≈ 0.08.     

水体中溶解氧对声致发光的影响

采用声源频率为1.1 MHz的超声波, 在温度为283～313 K的范围内引发水中的声致发光, 发现声致发光强度的对数lnI和水中的溶解(DO)的浓度之间呈线性关系。同时模拟了水中含有5种阴离子: Cl-, SO-₄, F-, NO-₃, HCO-₃时阴离子的存在对声致发光的影响, 发现上述5种阴离子对声致发光强度没有影响。     

以甲醇为燃料的中温固体氧化物燃料电池性能研究

制备了阳极负载型LDC-LSGM双层电解质薄膜电池.考察了单电池在分别使用甲醇和氢气两种燃料时,不同温度下的I～V性能.以甲醇为燃料,以空气为氧化剂时,800℃下的最大输出功率密度为1.07W/cm²,而使用氢气为燃料时,最大输出功率密度为1.54W/cm².通过交流阻抗研究了造成甲醇性能降低的可能原因.结果表明,以甲醇作为燃料时,单电池性能较氢气作为燃料时低.