Synthesis of Novel Chiral 7-Amide Substituted-4-androstene-3,17-dione Derivatives

A series of novel 7-amide substituted-4-androstene-3,17-dione derivatives(8αa 8αh or 8βa 8βh) was synthesized from the important intermediates 5 by N-acylation and acidic hydrolysis.Compounds 5α and 5β were obtained through the reaction sequence including acetalization,allylic oxidation,oximation and reduction.The structures of the target compounds were characterized by MS,1H NMR,13C NMR and HRMS spectra and their stereo configurations were identified through DEPT(distortionless enhancement by polarization ...     

LOCAL REGULARITY RESULT IN OBSTACLE PROBLEMS

We obtain a local regularity result for solutions to Kψ,θ-obstacle problem of A-harmonic equation divA(x,u(x),▽u(x))=0,where A:Ω× R×Rn → Rn is a Carath'eodory function satisfying some coercivity and growth conditions with the natural exponent 1pn,the obstacle function ψ≥0,and the boundary data θ∈W1,p(?).     

聚乙烯醇包埋龟裂链霉菌对水中Pb~(2 )吸附性能的研究

本文研究了聚乙烯醇包埋龟裂链霉菌菌丝体的包埋条件及包埋后对水中Pb2 的吸附作用。结果表明,包埋比例为3/1（W/W）,聚乙烯醇浓度为10%,海藻酸钠浓度0.2%,在含2?Cl2饱和硼酸溶液中固化24h是包埋反应的最佳条件。包埋后的饱和吸附量可达73.0mg/g,比未包埋龟裂链霉菌下降 47.1% 。pH值对吸附量的影响较包埋前下降。升高温度有利于吸附。     

RP(j)×CP(k)上向量丛的全Stiefel-Whitney类

本文利用Steenrod上同调运算及吴公式决定了RP(j)×CP(k)上的向量丛的全Stiefel-Whitney类的可能的形状．     

Gluon saturation and net-proton spectra in relativistic nucleus-nucleus collisions

By means of the AKK08 fragmentation function, the net-proton transverse momentum (pT) spectra in A+A collisions are studied with two phenomenological models based on the Color Glass Condensate formalism. After a χ² analysis of the experimental data from BRAHMS, the normalization constant C is extracted at RHIC energies of √sNN=62.4 and 200 GeV, and the theoretical results of the net-proton pT spectra at selected rapidities are also given. It is shown that the theoretical results are in good agreement with the experimental data. Finally, assuming the constant C should have an exponent dependence of √sNN, we also predict the theoretical results of net-proton pT spectra at LHC energies of √sNN=2.76, 3.94, and 5.52 TeV.     

中草药中微量锗和钼的同时测定

本文采用硅藻土 TBP反相萃取层析 分光光度法同时测定了中草药中的锗和钼的含量 ,获得了锗、钼含量较高的中草药。中草药样品经处理、消化后 ,用盐酸将试样中HCl浓度调至 6mol·L-1,加入以负载有磷酸三丁酯 (TBP)的烷基化硅藻土做固定相的层析柱。用 4mol·L-1盐酸以 0 5mL·min-1的流速洗脱锗 ,苯基荧光酮 CTMAB分光光度法测定锗 ,Ge PF CTMAB络合物的λmax=5 10nm ,摩尔吸收系数ε510 =1 6 7× 10 -5L·mol-1·cm-1。用 0 5mol·L-1盐酸以 0 5mL·min-1的流速洗脱钼 ,苯基荧光酮 CTMAB分光光度法测定钼 ,Mo PF CTMAB络合物的λmax=5 2 5nm ,摩尔吸光系数ε52 5=1 16× 10 -5L·mol-1·cm-1。该方法可对样品中的锗和钼同时测定 ,简便易行 ,具有较高的灵敏度 ,而且能有效地避免共存离子的干扰。     

微光像增强器噪声功率谱测试研究

在微光像增强器成像中 ,迭加在图像上的时空域噪声 ,不仅限制系统可工作的最低照度 ,而且使显示图像有随机蠕动颗粒闪烁的外观。适用的噪声性能测试分析技术则可为改善已有系统的成像质量、研制新型高性能的微光成像器件与系统提供必要的基础和客观依据。通过用CCD对像增强器噪声功率谱的测试发现像增强器噪声主要集中在低频部分 ,高频段的噪声近似为白噪声。     

Non-isothermal Kinetics of the Dehydration Process of Na_2MoO_4·2H_2O

Introduction In the field of thermal analysis kinetics, there have been many kinetic models and methods of processing the corresponding data, which can depict the most probable kinetic mechanism of solid state reactions, such as the method combining differential and integral methods,1-6 the method combining isothermal and non-isothermal processes7,8 and method of TA curve shape,9,10 and so on. Recently, based on the predeces-sor抯 work, a more complete kinetic method of process-ing thermal ana…     

具有双曲不变集系统的极限跟踪性

本文证明了Riemann流形上的微分同胚f在其双曲不变集附近具有相对于C1小扰动一致的极限 跟踪性.还证明了如果f是C1-结构稳定的,则,具有极限跟踪性.     

没有Lipschitz假设的-半压缩映象的不动点与-强拟增生算子方程解的逼近(英文)

设X为实一致光滑Banach空间,T:D(T)■X→X为-半压缩映象且在它的不动点q处是局部有界的.本文证明了Mann迭代与Ishikawa迭代过程强收敛于T的唯一不动点q.几个相关的结果处理(?)-强拟增生算子方程的解的迭代构造.本文所得到的结果扩展并推广了Xu和Roach,Zhou和Jia等人的相应结果.