比表面积和孔径分布测定与计算方法的改进

本文比较了BET多层吸附模型, Pickett有限层吸附模型以及Dubinin微孔填充模型, 并在此基础上, 假定多层吸附和微孔填充两种过程同时发生, 导出一个修正的吸附方程式, 并说明修正后的方程具有较大的适用性和准确性, 在孔径分布的测定中, 用H2替代He作为载气, 大大降低测定成本, 应用微机实现数据运算过程微机化和结果的图谱化, 大大缩短处理时间。     

气相色谱吸附过程的热力学函数变化及规律探讨 II: 吸附熵变的计算方程与硅胶对直链烷的吸附

本文从吸附平衡的定义导出一个较为合理的方程, 并据此计算了9个有机化合物在硅胶表面吸附过程的焓变和熵变, 所得结果进一步验证了热力学补偿效应、同系物碳数关系和等热力学等规律.     

Inheriting Conformal and Special Conformal Killing Vectors in String Cosmology

In this paper we study the consequences of the existence of conformal and special conformal Killing vectors (CKV, SCKV) for string cloud and string fluid in the context of general relativity. The inheritance symmetries of the string cloud and string fluid are discussed. Einstein's field equations have been solved for static spherically symmetric space-time with cloud and fluid of strings source via CKV.     

线性变位极谱研究 V:碲的吸附电流方程式

The mechanism of the electroreduction of Te(IV) has been studied, it is (TeO3)2- + 3H2O + 4e = (Teads)0 + 6OH- (1) (Teads)0 + H2O + 2e = (Hte)- + OH- (Teads)0 + 2e = Te2- The reaction scheme can generally be expressed as follows: ACcordingly, the equation of adsorptive current is give: i = 0.629 n2**2F**i/RT \n\(D0)1/2m2/3t7/6 \Pn\/(1+\Pn\)**2 (C0)* where \Pn\ = bAtA,7exp n2F/RT (E-E0)/& When \Pn\ = 1 the current reaches the maximum, ip = 0.157 n2**2F**2/RT \n\(D0)1/2m2/3t7/6(C0)* This equation shows that the peak current ip is proportional to m2/3t7/6, the ratio of potential change v and the concentration of the substance O being reduced. The half wave width, w1/2, can be obtained from the equation (6) in the form of the following expression W1/2 = 3.52RT/n2F The theoretical conclusions are in good agreement with experimental data for the adsorptive wave of tellurium in 0.25M NH3-NH4cl solution. The diffusion coefficient value determined agrees with that obtained by other polarographic method reported in the literature.     

二元及三元离子交换体系的统计热力学

本文用统计热力学方法对二元及三元离子交换体系进行了研究,得到了修正选择系数与交换剂组成关系的理论表达式,并得到二元交换体系的交换剂组分活度系数与组成的关系式,即Kielland公式。     

On a Static Solution of the Einstein Equation with Incoming and Outgoing Radiation

The Einstein equation with T = k k + where k, l are null is considered with spherical symmetry and staticity. The solution has a naked singularity and is not asymptotically flat. However, it may be interpreted as an envelope for any static spherical body making it more massive. Such an interpretation and some of its implications are detailed.     

Killing Pairs in Flat Space

In this paper the integrability conditions for Killing pairs in flat spaces are investigated and it is shown that only trivial Killing pairs exist.     

Evolution of Thin-wall Configurations ofTexture Matter

We consider the matter of global textures withinthe frameworks of a perfect fluid model in generalrelativity. We examine thermodynamical properties oftexture matter in comparison with radiation fluid and bubble matter. Then we study dynamics ofthin-wall selfgravitating texture objects, and show thatclassical motion can be elliptical (finite), parabolicalor hyperbolical. It is shown that total gravitational mass of neutral textures in equilibrium equalszero, as was expected. Finally, we carry out theWheeler-DeWitt minisuperspace quantization of thetheory, obtain exact wave functions and discrete spectra of bound states with provision for spatialtopology.     

Application of Halpin–Tsai equation to microfibril reinforced polypropylene/poly(ethylene terephthalate) composites

While the main goal of the first part of this study was to check the applicability of the Tsai–Hill equation to a polymer-polymer microfibril reinforced composite (MFC), in which the reinforcing elements represented microfibrils with a diameter around 1–3 μm and aspect ratio of about 100, in the present paper a similar goal involves the Halpin–Tsai equation. In addition, using compatibilised blends an attempt is made to shed light on the mechanism of the microfibril formation during drawing of isotropic polymer blends. For this purpose, injection moulded dog-bone test samples of blends of polypropylene/poly(ethylene terephthalate) (PP/PET) (60/40 wt%) have been prepared starting from highly drawn bristles, also from blends containing 0–9 wt% compatibiliser (ethylene-glycidyl methacrylate). The MFC structure of the test sample is established by X-ray and scanning electron microscope (SEM) analyses. The tensile data are compared with those predicted according to the Halpin–Tsai equation. It is shown that the predicted values are slightly higher than the measured ones and this finding is explained by the presence of a compatibiliser resulting in much lower aspect ratios of the microfibrils. The suggested mechanism of the microfibril formation is based on the coalescence of the individual elongated spheres during drawing. The SEM observations also show that the compatibilised blends contain much shorter microfibrils because the compatibiliser prevents the coalescence process.