相位交替组合脉冲NMR

用Wigner旋转矩阵和修改的Levenberg-Marquardt算法来描述优选相位交替组合π脉冲,编写了子程序DBCLSF和QRDCMP代表"IMSL"子程序库,解决非线性最小二乘法的问题.计算是在COMPAQ 586PC机上进行.可以发现,其优化结果同参考文献中用IBM/3600大型计算机的结果相同,优于其它现有的组合π脉冲.     

槲皮素-3-鼠李糖-(6-对羟基反式桂皮酰)葡萄糖甙1-2连接的NMR谱证据

用2D NMR技术研究了从银杏叶提取物中分离的一个黄酮双糖甙[槲皮素-3-鼠李糖-(6-对羟基反式桂皮酰)葡萄糖甙]的结构,对鼠李糖部分的¹H NMR,¹³C NMR化学位移进行了归属.¹³C化学位移和¹H NOE相关性都证明鼠李糖为1″-2″连接.     

高Tc超导谐振器微波特性研究

研究了高Ｔｃ超导谐振器的微波特性特别是表面电阻Ｒｓ和磁场穿透深度λ,给出了Ｒｓ随温度变化的曲线以及穿透深度的测量结果。实验中采用了由ＹＢａ２Ｃｕ３Ｏ７薄膜和蓝宝石片构成的平行板谐振器。     

纳米晶Si在高压下的电学性质与金属化相变

 在金刚石压砧装置上,采用电阻和电容测量方法,研究了粒径为15~18 nm和80 nm的纳米晶Si在室温下、24 GPa内的电阻、电容与压力的关系。实验结果表明,它们分别在19~17 GPa和14 GPa左右发生了金属化相变。     

超Ornstein-Uhlenbeck过程的占位时过程的绝对连续性

证明了分支特征为ψ（z)=z^2,底过程为d≤3的暂留Ornstein-Uhlenbeck（O．U．）过程的超过程Xt的占位时过程Y（t)=∫^t0Xsds关于Lebesgue测度绝对连续,且其密度过程Y（t,x)关于t≥0,x∈R^d联合连续。     

鲁西南地区红层软岩水岩作用特征与工程应用

鲁西南各断块盆地中广泛分布有侏罗、第三系的紫红色、杂色砂砾岩,岩石呈固结半固结状态,遇水后发生渗透、膨胀、崩解和软化等失稳现象,对煤矿建井及煤矿开采带来重大威胁。本文采用X衍射仪、扫描电镜、压汞仪及液压伺服机等手段进行了红层软岩的物质组成、微孔结构及渗透性的试验研究,探讨了红层软岩的渗透机理及遇水失稳机理,并结合实例进行了工程应用分析。     

A Series Piezoelectric Quartz Crystal Microbial Sensing Technique Used for Biochemical Oxygen Demand Assay in Environmental Monitoring

A new method for biochemical oxygen demand (BOD) determination, which combines the series piezoelectric quartz crystal (SPQC) technique with the growth of a microorganism is presented in this paper. This method needs no immobilization of bacteria and is simple and convenient. When a calibration technique was used for BOD analysis, the detection time was 2.5 h at 37°C. There was a good linear relationship between the frequency shift and BOD value in the range 2.2–11 mg/L and the regression equation was ΔF = 64.10 + 11.23[BOD]. The proposed method was compared with the conventional BOD₅ method. This method was more rapid than the BOD₅ method and the results obtained by the former were in good agreement with those obtained by the latter. The experimental conditions are also discussed in detail.     

N,N,N',N'-Tetrabutyladipicamide as a new extractant in toluene of nitric acid and uranium (VI)

N,N,N',N'-Tetrabutyladipicamide (TBAA) was used for the extraction of nitric acid and uranyl(II) ion from nitric acid media into toluene. The effects of nitric acid, uranyl(II) ion, and extractant concentration, temperature and back extraction on the distribution coefficient of uranyl(II) ion have been studied. The main adduct of TBAA and HNO₃ is TBAA·HNO₃ in 1.0 mol/l nitric acid solution. The 1:2:2 complex of uranyl(II) ion, nitrate ion and TBAA as extracted species is further confirmed by IR spectra of the extraction of uranyl(II) ion with TBAA. The values of the thermodynamic parameters have also been calculated.     

Densities and apparent molar volumes for aqueous solutions of HNO3−UO2(NO3)2 at 298.15 K

In order to obtain the exact information of atomic number density in the ternary system of HNO₃−UO₂(NO₃)₂−H₂O, the densities were measured with an Anton-Paar DMA60/602 digital density meter thermostated at 298.15±0.01 K. The apparent molal volumes for the systems were calculated from the experimental data. The present measured apparent molar volumes have been fitted to the Pitzer ion-interaction model, which provides an adequate representation of the experimental data for mixed aqueous electrolyte solutions up to 6.2 mol/kg ionic strength. This fit yields θ ^V , and ψ ^V , which are the first derivatives with respect to pressure of the mixing interaction parameters for the excess free energy. With the mixing parameters θ ^V , and ψ ^V , the densities and apparent molar volumes of the ternary system studied in this work can be calculated with good accuracy, as shown by the standard deviations.     

Canonical Symmetries in the Functional Formalism

Based on the phase-space generating functionalof the Green function, the canonical Ward identities(CWI) under local, nonlocal, and global transformationsin phase space for a system with a regular and singular Lagrangian have been derived. Therelation of global canonical symmetries to conservationlaws at the quantum level is presented. The advantage ofthis formulation is that one does not need to carry out the integration over canonicalmomenta in a phase-space path (functional) integral asin the traditional treatment in configuration space. Ingeneral, the connection between global canonicalsymmetries and conservation laws in classical theories isno longer preserved in quantum theories. Applications ofour formulation to the non-Abelian Chern-Simons (CS)theory are given, and new forms for CS gauge-ghost field proper vertices and the quantal conservedangular momentum of this system are obtained; thisangular momentum differs from the classical one in thatone needs to take into account the contribution of angular momenta of ghost fields.