纳米修饰玻碳电极阳极示差脉冲伏安法测定盐酸异丙嗪

将亲脂性纳米材料单层地修饰于玻碳电极表面,在pH=7.3的磷酸盐缓冲溶液中,于0.0～1.0V(vsSCE)范围内对盐酸异丙嗪进行阳极示差脉冲伏安分析,在0.57V(vsSCE)处出现一灵敏的盐酸异丙嗪氧化峰.该峰电流可用于定量测定6.0×10-8～5.4×10-6mol·L-1浓度范围内的盐酸异丙嗪,检出限为2.0×10-8mol·L-1.与裸玻碳电极相比,由于表面MPCs(monolayerprotectedclusters)的疏水性,纳米修饰玻碳电极既可富集异丙嗪分子以提高检测的灵敏度,又能显著减少水溶性物质如抗坏血酸等的干扰,而且检测时无需除氧.实验对pH、MPCs组装时间、富集电位及时间、扫描速率等条件进行了优化.     

CDMA中的多用户检测技术及研究动态

多用户检测是解决DS—CDMA系统中MAI的关键技术。在介绍MUD原理的基础上,对现有一些算法的性能、特点和不足进行了分析,并指出了多用户检测的发展方向。     

固体-液体-基底结构中裂纹形貌形成机制

试验发现，在固体膜-液体膜-基底结构中，若固体薄膜具有受压的本征应力，往往会发生开裂破坏，且裂纹呈现正弦波浪状或分叉状,采用细观力学的方法，研究产生此种开裂现象的机制．首先假设两种不同的固体薄膜变形单元，并通过能量的方法研究，结果表明，这两种不同的变形模式单元能同时通过不同的排列，组合成复杂的图纹．以变形模式为基础，给出了固体薄膜中微缺陷扩展成裂纹的准则，解释了产生上述裂纹形貌的机制．最后讨论了裂纹起始时间的预测问题．     

为建设环境友好型社会打造舆论基础

我国环境新闻报道的现状 高度工业文明的发展加剧了人类生存环境的变化，1972年6月5日，联合国召开第一次人类环境会议．并把每年的这一天定为“世界环境日”，这次会议标志着全人类对环境问题的觉醒，从此，环境保护成为公众关注的热点。新闻媒体作为信息捕捉和传播的载体，在这方面的敏感不可或缺，因而环境新闻报道与环境记者群体也随之发展壮大。     

Research on Chinese Visible Human Project

" Visible Human Project (VHP)" was initiated by US National Library of Medicine in 1989, and in August 1991, the library signed a contract with Health Science Center of the University of Colorado to formally carry out the project. Accordingly, research team at the University of Colorado collected a structural data set of human body after obtaining successive sectional images. A digital image data set of a complete human male cadaver was acquired and made available for public use in November 1994, which aroused worldwide enthusiasm in this field, and remarkable social and economic benefit has been gained. Thereafter, some countries initiated their visible human project one after another. Korea started 5-year" Visible Korean Human (VKH)" project (Mar. 2000-Feb. 2005) in 2000, and the first data set derived from a patient with cerebroma was acquired in 2001. China began its project in 1999. The first data set of Chinese visible human was obtained at The Third Military Medical University in October 2002. Be     

MAP kinase specifically mediates the ABA-induced H<Subscript>2</Subscript>O<Subscript>2</Subscript> generation in guard cells of<Emphasis Type="Italic">Vicia faba</Emphasis> L.

The plant hormone abscisic acid (ABA) is involved in regulating adverse physiological processes, including stomatal closure, seed development and germination, and mediating many environmental stress responses, such as drought, salinity and extreme temperatures[1,2]. In re-sponse to various stress stimuli, ABA synthesis is in-creased in plant cells, which triggers a series of physio-logical responses to adapt the stress conditions[1—3]. For example, under water deficit, ABA acts directly on…     

Star pattern recognition method based on neural network

Star sensor is a sensitive instrument for determina-tion of a spacecraft attitude with high accuracy. The in-strument can determine the spacecraft 3-axis attitude through the recognition of observed stars. It measures star magnitude and star coordinates in the spacecraft coordi-nate frame. The measures are then compared with a refer-ence star catalog to obtain the attitude information of the spacecraft[1,2]. The purpose of star pattern recognition is to identify the corresponding relations bet…     

Electrofusion of tobacco protoplasts in space

Electrofusion of plant cell protoplasts is a techniqueto induce fusion between protoplasts by the reversibleelectric breakdown of their plasma membranes. This method is reliable and not toxic compared with chemicalfusion. Some somatic plant cell hybrids have been suc-cessfully produced by this method[1—5]. However, it is notwidely applied in agriculture due to the low yield of vi-able hybrids[6]. The reasons resulting in the low yield ofhybrids might be as the followings: (1) different densit…     

Effects of the rare earth ions on bone resorbing function of rabbit mature osteoclasts<Emphasis Type="Italic">in vitro</Emphasis>

The osteoclast plays initiating and vanguard roles in the course of bone remodeling. The resorption and formation of bone is the basic clues of bone remodeling, which results from the mutual dependent functions of osteoclasts and osteoblasts. When the osteoclasts are activated, the bone resorption function is increased. The excess bone resorption leads to osteoporosis, characterized by formation of many hollows, lacunae and tunnels on the bone surface or in depth[1,2]. The differentiation, pro…     

Synthesis,crystal structure of a novel yttrium (Ⅲ) coordination compound supported by typical plenary Dawson cluster

Asarichanddiverseclassofinorganicclustersytems,thepolyoxometalateions,whicharecharacterizedbyfascinatingstructural,electrochemical,catalytic,manetic,medicinal,andphotophysicalproperties,havebeenfoundtobeextremelyversatileinorganicbuildingblocksinthefieldsofdesigningandassemblingmolecule-basedmaterials[1].Basedoncoordinationcapabilityofthesufaceoxygenatoms(bridgingorterminaloxygenatoms)ofthepolyoxoanions,novelcomplexeswithadiscretecluter,1D,2Dor3Dstructurescanbesynthesizedthroughmetalunitsbeing…