亲水有机相-含盐水两相体系的形成机理与分相能力

亲水有机相-含盐水两相体系的形成机理与分相能力;亲水有机相;含盐水相;两相体系;分相机理;分相能力     

硬质合金CVD金刚石涂层工具衬底前处理技术研究

本研究采用KOH:K3[Fe(CN)6]:H2O和H2SO4:H2O2两种溶液浸蚀硬质合金衬底,分别选择刻蚀WC和Co.并在浸蚀过的硬质合金衬底上,用强电流直流伸展电弧等离子体CVD法沉积金刚石涂层.研究表明,两步混合处理法不仅可以有效的去除硬质合金基体表面的钴,而且,还可显著粗化硬质合金衬底.因此,提高了金刚石薄膜的质量和涂层的附着力.     

Waveguides induced by grey screening solitons

We investigate the properties of waveguides induced by one-dimensional grey screening solitons in biased photorefractive crystals. The results show that waveguides induced by grey screening solitons are always of single mode for all intensity ratios, i.e. the ratios between the peak intensity of the soliton and the dark irradiance. Our analysis indicates that the energy confined near the centre of the grey soliton and the propagation constant of the guided mode of the waveguide induced by the grey screening soliton increase monotonically with intensity ratio increasing. On the other hand, when the soliton greyness increases, the energy confined near the centre of the grey soliton and the propagation constant of the guided mode of the waveguide induced by the grey screening soliton decrease monotonically. Relevant examples are provided where photorefractive crystal is of the strontium barium niobate type.     

Modulation instability of quasi-plane-wave optical beams in biased photorefractive-photovoltaic crystals

We investigate the modulation instability of quasi-plane-wave optical beams in biased photorefractive－photovoltaic crystals by globally treating the space-charge field. The modulation instability growth rate is obtained, which depends on the external bias field, on the bulk photovoltaic effect, and on the ratio of the optical beam's intensity to that of the dark irradiance. Our analysis indicates that this modulation instability growth rate is identical to the modulation instability growth rate studied previously in biased photorefractive－nonphotovoltaic crystals when the bulk photovoltaic effect is negligible for shorted circuits, and predicts the modulation instability growth rate in open- and closed-circuit photorefractive－photovoltaic crystals when the external bias field is absent.     

以肿瘤凋亡相关蛋白和基因为靶的小分子*

细胞凋亡的调控作为治疗肿瘤的新兴手段,近年来受到广泛关注。本文对细胞凋亡途径中的重要靶点,包括Bcl-2,IAP,p53等的结构及作用机制作了较详尽的阐述,并且总结了针对上述不同靶点的对细胞凋亡进行调控的化学小分子的研究。在对这些研究现状进行分析的基础上,对该研究领域下一步的发展方向提出了我们的观点。     

空间充气展开结构动态分析研究进展

空间充气展开结构是一种以薄膜材料为主构建而成的新型结构, 可用于构建大型的天线、太阳能集中器、太阳帆等空间结构, 为空间结构的大型化提供了一条有效的解决途径.其动态特性是充气展开结构设计过程中必须考虑的问题, 动态分析测试技术一直是充气展开结构研究过程中的关键问题, 由于充气展开结构在材料、结构形式及工作环境等方面的特殊性, 使得其动态分析和测试技术出现了很多新的问题.目前充气展开结构动态分析的研究方法主要集中在两个方面:实验研究和数值模拟.实验研究主要是针对充气薄膜结构的特点, 由接触式的测试手段向非接触式的测试手段发展, 但实验研究在真空和微重力环境的模拟上面临着很大的问题.数值模拟研究可以有效的模拟结构在真空和微重力环境下的动态行为, 并可分析重力、空气和褶皱等因素对结构振动特性的耦合影响.本文综述了空间充气展开结构动态分析的实验研究和数值研究的发展和现状, 并讨论了其中存在的问题, 在此基础上指出了该项研究的发展趋势.      

First-principles calculations of structure and high pressure phase transition in gallium nitride

The phase transitions of semiconductor GaN from the Wurtzite (WZ) structure and the zinc-blende (ZB) structure to the rocksalt (RS) structure are investigated by using the first-principles plane-wave pseudopotential density functional method combined with the ultrasoft pseudopotential scheme in the generalized gradient approximation (GGA) correction. It is found that the phase transitions from the WZ structure and the ZB structure to the RS structure occur at pressures of 46.1 GPa and 45.2 GPa, respectively. The lattice parameters, bulk moduli and their pressure derivatives of these structures of GaN are also calculated. Our results are consistent with available experimental and other theoretical results. The dependence of the normalized formula-unit volume $V/V_{0 }$ on pressure $P$ is also successfully obtained.     

Grey screening-photovoltaic soliton-induced waveguides

This paper shows that waveguides induced by grey screening-photovoltaic solitons are always single mode for all intensity ratios, which are the ratio between the peak intensity of the soliton and the dark irradiance. It finds that the confined energy near the centre of the grey soliton and the propagation constant of the guided mode increase monotonically with increasing intensity ratio. On the other hand, when the soliton greyness increases, the confined energy near the centre of the grey soliton and the propagation constant of the guided mode reduce monotonically. When the bulk photovoltaic effect is neglected for short circuits, these waveguides become waveguides induced by grey screening solitons. When the external bias field is absent, these waveguides become waveguides induced by grey photovoltaic solitons.[第一段]     

高氮化合物及其含能材料*

高氮含能化合物及其含能材料是新型含能材料领域的研究热点之一。相比于传统的含能材料,高氮含能材料具有很多优异或独特的理化性能和爆轰性能。本文综述了新型高氮化合物及其含能材料的研究进展,介绍了国内外近十年来众多研究小组的相关工作,重点阐述了四嗪、四唑和呋咱3大类高氮含能化合物的合成、性能及应用研究进展。结合作者的研究工作,进一步探讨了高氮含能化合物在钝感高能炸药、推进剂和新型气体发生剂等含能材料领域中的应用前景。     

4-羟基苯乙烯基吡啶为HRP底物的酶荧光免疫传感体系测定布氏杆菌抗体

本文合成了一种新型辣根过氧化物酶（HRP）荧光底物—4-羟基苯乙基吡啶（pHSP）,并首次将它运用于酶联荧光免疫传感体系。对pHSP化学性质的研究证实,pHSP在空气中较稳定,对HRP、H2O2的荧光响应性能优于传统HRP荧光底物如对羟苯乙酸、Amplex Red和佳味醇等。pHSP本身只有极弱的荧光,在HRP催化下可被 H2O2氧化成二聚体产物,该二聚体在300 nm的激发光下能发射波长为437 nm的强荧光,并且反应体系的荧光增加与HRP量在一定浓度范围内成线形相关。根据此原理,建立了兔布氏杆菌抗体的酶联荧光传感分析新方法。运用制备的传感装置测定兔布氏杆菌抗体的线形范围为110-5 1.6 10-3 g/L,抗体检出限为110-5 g/L,相对标准偏差为4.1%（n=11）。 pHSP的二聚体产物水溶性很低,利用设计的装置较好地解决了传统测定溶液体系方法灵敏度打折的问题。