Preparation and optical properties of solid solution semiconductor (Zn x Cd1−x S) doped silica glasses

Semiconductor(Zn_xCd_1−x S) doped silica glasses were prepared by Sol-Gel process andin situ growth technique. The structure of the materials was characterized by X-ray diffraction technique, the particle size of semiconductor crystallites from X-ray patterns was estimated less than 10 nm. From absorption spectra, it is obtained that the absorption edges shifted to short wavelength direction when Zn contents increased, and the absorption edge can be adjusted from 2.46 eV to 2.96 eV by controlling Zn contents. The third-order nonlinear optical susceptibility was studied at 532 nm with 8 ns pulse laser by degenerate four wave mixing (DFWM) technique.     

Comprehensive evaluation of mechanism of “chimney effect” using principles of magnetism, geochemistry and mineralogy

Study of forming mechanism of "chimney-effect" (CE) has important significance for basic theory and applications of non-seismic geophysical and geochemical methods locating oil/gas reservoirs. The theoretical basis of comprehensive evaluation of mechanism of CE using principles of magnetism, geochemistry and mineralogy has been reviewed, with the problems to be solved: (ⅰ) study for the relationship between process of oil/gas migration and geochemical field; (ⅱ) analysis of genesis of magnetic, geochemical and mineralogical anomaly; (ⅲ) interpretation of surface soil magnetism and geochemical anomaly combined with seismic data.     

Carbon isotope anomaly in marbles associated with eclogites from the Dabie Mountains

This is a report of carbon isotope anomaly in marbles associated with the UHP eclogites from the Dabie Mountains. The results place constraints on the degree of crust-mantle interaction during the UHP metamorphism.     

Research advances in gene therapy for Parkinson's disease

During the long period of time when people have been seeking for an effective therapeutic method for PD, the gene therapy has shown greater and greater advantages over other methods. It can be performed mainly in two ways: ex vivo and in vivo. With the former, TH gene as well as some neurotrophic factor genes (such as GDNF, BNDF genes) can be invited to some cell lines or primary cells thus forming engineered cells and then implanting them into brain. While with the latter, viral vectors including HSV-1, Ad, AAV that can be utilized to construct recombinant viruses, or non-virus vectors can be used to delived DNA into brain directly. The present review summarizes the recent research advances in the gene therapy for PD, and it is reasonable for us to predict a notable progress in prevention and treatment for PD in the next decade.     

Neuropeptide Y receptors in a protozoaStylonychia mytilus

Radio ligand binding assays(RLBA) were used to study neuropeptide Y (NPY) receptors in a protozoa Stylonychia mytilus. The experimental results showed that 2-3×10+3/mL Stylonychia cells incubated in Pringsheim solution which contained 3H-NPY could specifically bind 3H-NPY and concomitantly present saturable characteristic. This suggested that Stylonychia possessed some specific binding sites for NPY. Scatchard transformations of binding assay for the NPY receptors at 25℃ are compatible with the specific activity of 42.47 fmol/10+3 cells and the binding equilibrium constant of 0.113 nmol/L. The data of 125I-NPY binding assay to the membrane protein extract of Stylonychia indicated that there was a significant difference between the amount of total bound and nonspecific bound of 125I-NPY. This result indicated that NPY receptors were probably localized mainly on the cell membrane.     

Third-order optical nonlinearities for lanthanum (Ⅲ) complexes with 1,10-phenanthroline components

The nonlinear refractive indexes n 2 for the ethanol solutions of 1,10-phenanthroline (2.0×10 -3 mol·L -1), [bis(1,10-phenanthroline) lanthanum (Ⅲ)] nitrate (1.0×10 -3 mol·L -1), and [nitrato-fluoracil-bis (1,10-phenanthroline) lanthanum (Ⅲ)] nitrate (1.0×10 -3 mol·L -1) are first measured, the third-order nonlinear optical susceptibilities χ (3) and <γ> are calculated, and the mechanisms of the third-order optical nonlinearities enhanced by lanthanum (Ⅲ) are discussed preliminarily.     

十八烷基（2—亚硫酸）乙基二甲基铵的合成

由Ｎ,Ｎ－二甲基十八烷基胺和乙撑亚硫酸酯反应合成十八烷基（２－亚硫酸）乙基二甲基铵是一种新型的亚硫酸内酯型两性表面活性剂,经红外光谱和核磁共振谱分析,确定了该化合物的结构,该两性表面活性剂合成方法简单,原料易得,用途广泛,有发展前途。     

FMS装卸工作站研制中的工业造型设计

简单介绍了柔性加工系统的概念和组成,以及本系统中装卸工作站的要求。归纳了工业设计理论发展,充实,完善的过程,提出了现代工业设计应遵循工业设计三原则,针对不同产品,从里到外,从外到里,反复设计的观点。论述了这一设计理论在ＦＭＳ装卸工作站设计中的实践。最后说明实践成果。     

信息增长对科技馆藏书刊的新要求

分析了图书馆在科技信息日益增多环境下的馆藏书刊如何进行适时合理调整,以适应新形势的新要求,更好地为科研工作服务