NEW POINTS OF VIEW ON THE NONLOCAL FIELD THEORY AND THEIR APPLICATIONS TO THE FRACTURE MECHANICS (Ⅰ)──FUNDAMENTAL THEORY

In the linear nonlocal elasticity theory, the solution to the boundary-value problem of the crack with a constant stress boundary condition does not exist. This problem has been studied in this paper. The contents studied contain of examining objectivity of the energy balance, deducing the constitutive equations of nonlocal thermoelastic bodies, and determining nonlocal force and the linear nonlocal elasticity theory. Some new results are obtained. Among them, the stress boundary condition derived from the linear theory not only solves the problem mentioned at the beginning, but also contains the model of molecular cohesive stress on the sharp crack tip advanced by Barenblatt.     

关于非局部场论的几个新观点及其在断裂力学中的应用(Ⅰ)──基本理论部分

在线性非局部弹性理论中,具有均匀常应力边界的裂纹混合边界值问题的解是不存在的.本文从非局部场论的基本理论出发针对这一问题进行了研究.内容包括:对非局部能量守恒定律的客观性的考察,非局部热弹性体本构方程的推导,非局部体力的确定以及线性化理论,得到了一些新结果.其中,在线性化理论中所推出的应力边界条件不仅解决了本摘要开头所提到的问题,而且自然地包括了Barenblatt裂纹尖端的分子内聚力模型.     

几种对称镍卟啉配合物的合成、表征和电化学性质

卟啉试剂是一类重要的离子配位显色剂,在生物体中具有重要作用．作为自然界存在的金属卟啉之一,镍卟啉的电化学研究具有化学和生物学意义．四对羟基苯基卟啉合成已有不少报道［１,２］,但产率较低,只有１０％左右．Ｌｉｎｄｓｅｙ等发现用ＢＦ３作催化剂,在ＣＨ２Ｃ...     

铜铁试剂的交流示波极谱滴定法研究

提出了用交流示波极谱滴定法测定铜合金中的铜和测定铜铁试剂的方法。该法快速、准确、终点直观。测定了铜合金中的铜,变动系数0.07％～0.17％。考察了紫外光照射下铜铁试剂的动力学行为。     

钼（Ⅵ）—苦杏仁酸体系的吸附伏安行为

本文对Mo(Ⅵ)-苦杏仁酸体系的吸附伏安行为做了系统的研究。测定了吸附量与络合物的形成常数,在此基础上建立了钼的吸附溶出伏安法。     

线性非局部弹性理论的修正

本文通过考虑局部化残余力的影响对线性非局部弹性理论进行了修正，由修正后的理论所导出的应力边界条件包含了物体微观结构的长程力的作用，这个结果不仅解释了在裂纹混合边界值问题中线性非局部弹性理论方程的解在常应力边界条件下不存在的问题，而且可以自然地得到裂纹尖端的Ｂａｒｅｎｂｌａｔｔ分子内聚力模型。     

MIGDAL SCHEME FOR THE EFFECTIVE COUPLINGS OF POLYAKOV LOOPS

The Migdal renormalization group(MRG) procedure is applied to the finite temperature SU(2) lattice gauge theory.With its effective action form in terms of the Polyakov Zoop we an-alyse the strong and weak coupling approximations of the evolution of renormalized couplings.The distribution of renormalization group trajectory is obtained and the critical coupling is measured.     

关于线性非局部弹性理论的应力边界条件

应力边界条件的提法是线性非局部弹性理论尚未解决的一个理论问题。文中针对这一问题进行了研究，所导出的应力边界条件包含了物体微观结构的长程相互作用，这个结果不仅解释了在裂纹混合边界值问题中非线性局部弹性理论方程的解在常应力边界条件下不存在的问题，而且可以自然地得到裂纹尖端的分子内聚力模型。     

石墨炉原子吸收光谱法测定高温合金中镓

研究了普通石墨管、平台石墨管和涂钼普通石墨管对镓的测定性能.得出涂钼普通石墨管对镓的测定灵敏度和重现性均好于其他石墨管.从而建立了一种更为满意的石墨炉原子吸收测定高温合金中镓的新方法.     

Hollow mesoporous silica nanoparticles for intracellular delivery of fluorescent dye

In this study, hollow mesoporous silica nanoparticles (HMSNs) were synthesized using the sol-gel/emulsion approach and its potential application in drug delivery was assessed. The HMSNs were characterized, by transmission electron microscopy (TEM), Scanning Electron Microscopy (SEM), nitrogen adsorption/desorption and Brunauer-Emmett-Teller (BET), to have a mesoporous layer on its surface, with an average pore diameter of about 2 nm and a surface area of 880 m²/g. Fluorescein isothiocyanate (FITC) loaded into these HMSNs was used as a model platform to assess its efficacy as a drug delivery tool. Its release kinetic study revealed a sequential release of FITC from the HMSNs for over a period of one week when soaked in inorganic solution, while a burst release kinetic of the dye was observed just within a few hours of soaking in organic solution. These FITC-loaded HMSNs was also found capable to be internalized by live human cervical cancer cells (HeLa), wherein it was quickly released into the cytoplasm within a short period of time after intracellular uptake. We envision that these HMSNs, with large pores and high efficacy to adsorb chemicals such as the fluorescent dye FITC, could serve as a delivery vehicle for controlled release of chemicals administered into live cells, opening potential to a diverse range of applications including drug storage and release as well as metabolic manipulation of cells.