串接型三能级原子的感应极化

从求在双频场作用下的三能级原子系统的哈密顿量的本征函数和本征值出发,导出系统随时间的演化规律.从而得出宏观极化的表示式.计算了极化的频谱分布和它们的相对强度.     

Hq^p（p≥1,q〉1）空间中多项式最佳逼近的逆定理

本文在文献[2]、[3]、[4]的基础上研究 H_q~p(p≥1,q>1)空间中的 Bernstein型不等式及多项式最佳逼近的逆定理.     

不锈钢中痕量氢的热抽取高频放电光电光谱测定

装配了一台热抽取高频放电光电测氢装置,建立了不锈钢中痕量氢的热抽取高频放电光电测定方法。该装置简易价廉,检测限和准确度可与RH-1型定氢仪媲美。     

BENZODIAZEPINE RECEPTORS IN ISOLATED ADRENAL GLOMERULOSA CELLS

In our experiments the isolated rat adrenal glomerulosa cells displayed perlpheral-type benzodiazepine receptors, which could bind to [~3H] PKl1195 with an apparent equilibrium dissociation constant (KD) of 9.4±2.8 nmol/L and a maximal binding capacity (B_(max)) of 5.6q-1.8 pmol/10~6 cells. The effects of five ligands: PKl1195, Ro5--4846, flunitrazepam, diazepam and clonazepam on aldosterone secretion responses of isolated glomerulosa cells to anglotensin Ⅱ or extracellular potassium ions were observed. The logarithm of EO_(50) for these ligands as stimulators was well correlated with the logarithm of their Ki value for [~3H] PK11195 binding, suggesting that the stimulative effects might be mediated by the benzodiazepine receptor in isolated glomerulosa cells.     

Catalytic Kinetics of the Schiff Base Metal Complexes Bearing Side Chain of Cyclic morpholine in Carboxylic Ester Hydrolysis

It has been reported that two Schiff base transition metal complexes bearing the side chain of the morpholine ring were synthesized and characterized, and two complexes with the same base agent but different metal ions were used as a simulant hydrolase in the catalytic hydrolysis of p-nitrophenyl picolinate in this paper. The mechanism of PNPP catalytic hydrolysis is proposed and supported by the results of the spectral analysis and the kinetic calculation. A kinetic mathematical model, applied to the calculation of the kinetic and thermodynamics parameters of PNPP catalytic hydrolysis, has been established on the foundation of the mechanism proposed. The result of the study shows that the two complexes have a good catalytic activity in PNPP catalytic hydrolysis, and the rate of the PNPP catalytic hydrolysis was increased with the increase of the pH values in the buffer solution and affected by the polarization effect of metal ion of the complexes.     

灵猫香酮及其同系物的气相色谱研究

商品灵猫香(非洲大灵猫Virerra zibetha所产)主含灵猫香酮(9-顺-环十七烯酮),及少量环十六、十七烷酮、6-顺-环十七烯酮和9-顺-环十九烯酮。我国小灵猫(Vivarricula indica Desmarest)所产灵猫香中大环酮组份尚未见报导。本文采用PEG-20M(Z′=368)与SE-30(Z′=44)的混合固定液分离环十五烷酮与麝香酮(3-甲基环十五烷酮)及环十七烷酮与环十七烯酮二个物质对,便于灵猫香和麝香在同一     

N-羟基邻苯二甲酰亚胺引发的聚乙烯熔融接枝反应

研究了N-羟基邻苯二甲酰亚胺(NOP)用于引发4种卤胺类前驱单体包括甲基丙烯酰胺(MA)、N-叔丁基丙烯酰胺(N-t-BuA)、马来酰亚胺(MI)和N,N-二烯丙基三聚氰胺(NDAM)与线性低密度聚乙烯(LLDPE)的熔融接枝聚合反应,并将其与工业上普遍应用的有机过氧化物(过氧化二异丙苯,DCP)引发法作对比。在接枝效率方面,NOP的引发效率与单体的分子结构和投料量密切相关。这4种单体中,N-t-BuA的接枝效率最高,与DCP法的差异在2.5%~16.0%之间;MI的接枝效率最低,比DCP法低55%。在副反应控制方面,实时扭矩、凝胶含量和熔融指数测试证实NOP引发体系中聚乙烯交联副反应程度明显低于DCP,接枝反应更加可控。     

巨磁致伸缩合金Tb-Dy-Fe近似单晶颗粒在磁场中的取向

主要研究了TbxDy1-xFey(0.27≤x≤0.50,y≈1.95)退火合金粉末的近似单晶颗粒,在磁场中的取向情况,及其与成分x,颗粒的粒度,有机胶比,取向场,取向温度等之间的关系.观察到在x为0.295与0.33之间,取向效果有很大的差异.并对取向效果与上述各因素之间的关系进行了讨论.     

卵类糖蛋白手性柱拆分钙离子拮抗剂尼卡地平对映体

研究了在卵类糖蛋白（OCCHI）手性柱上影响钙离子拮抗剂尼卡地平对映体拆分的主要因素，建立了尼卡地平对映体的拆分方法。氨丙基硅胶在0．2moL／L磷酸钠缓冲液（pH6．6）中与OGCHI反应，制备的固定相装填于10cm不锈钢柱中，用高效液相色谱法拆分尼卡地平对映体。优化的色谱条件为：0．05moL／L磷酸钠缓冲液（pH5．5）-甲醇（65：35），流速0．2mL／min，紫外检测波长236nm，柱温：25℃。在此条件下，尼卡地平对映体可得到良好分离。通过改变有机改性剂的种类和比例、流动相的pH值、缓冲溶液的浓度以及流速等色谱条件，确定了影响尼卡地平对映体拆分的主要因素。     

运动合成与分解实验的改进

普通高中课程标准实验教科书物理必修2第4页关于质点在平面内的运动的演示实验,利用了一根玻璃管、红蜡、水来演示蜡块的运动,笔者发现此实验效果不佳,原因有二:一是画蜡块运动轨迹不能"定格";二是蜡块的合速度与分速度不能定量的测出.