江西万安水利枢纽对赣江鲥繁殖的影响及其对策

赣江是长江鲥的主要繁殖场所。本文阐述了赣江鲥的生活习性和资源状况,针对万安水利枢纽水库的调度特性,分析了96m初期运行力案对赣江鲥繁殖活动的影响。认为在6月底以前,鲥产卵江段的水文要素没有显著改变,产卵活动不会受到危害;但7月初水库开始蓄水后,产卵必需的涨水条件难于满足,将严重影响鲥的繁殖,必须采取适当的措施加以补救.

藻类蛋白生产基地的平菇高产轮作研究

<正> 迄今尚未见将藻类生产与食用菌生产结合研究的报导。1983年以来,我们在研究发展藻类生物技术,进行藻类蛋白工厂化生产试验的同时,利用生产藻类蛋白的塑料大棚冬闲时间生产食用菌,连续五年获得平菇大面积高产丰收,取得显著效益。1987年平菇培养面积1680平方米,产菇42.1吨,产值5.31万元。同时,我们还发现藻类提取物与菌块提取物在分别促进菌、藻生长中的一些生物学作用。这里,将大棚生产平菇阶段的结果报导如下。材料与方法生产基地位于湖北省黄梅县境内,地处长江中游江汉平原东部。采用菌株系由平菇(Pleur

中华鲟鱼在葛洲坝坝下江段形成了新的产卵场

<正> 中国科学院水生生物研究所第一研究室鱼类生态的研究人员,于1982年11月1～2日(水温18～19℃),解剖了30尾从宜昌十里红江段刚捕起的铜鱼,发现其中14尾鱼的肠管中有中华鲟的卵,胚胎已发育到囊胚期和原肠期.据推算距受精时间约为17～25小时.11月5～6日在同一地点,又解剖到肠管中含有中华鲟卵的铜鱼7尾,卵子发育至卵裂期,距受精时间约数小时,可判定与11月1～2日所发现的鲟卵不是同批产出的.

可调三角形共轭振幅模板及其实现光纤光栅切趾的方法

本发明公开了一种用于光纤光栅切趾的可调三角形共轭振幅模板，其特征在于，包括一共轭振幅板(19)，上有正切趾光阑(17)和反切趾光阑(18)，该共轭振幅板(19)正面安装有上挡板(20)和下挡板(21)，上挡板(20)和下挡板(21)分别在上挡板导轨(25)和下挡板导轨(26)的导引下上下滑动，该共轭振幅板(19)背面安装有左栅长定位板(22)和右栅长定位板(23)，左栅长定位板(22)和右栅长定位板(23)在栅长定位板导轨(31)的导引下左右滑动。本发明同时公开了一种利用可调三角形共轭振幅模板实现光纤光栅切趾的方法。本发明适应性好，灵活性强，工艺简单。

Frequency mixing and phase detection functionalities of three-terminal ballistic junctions

Three-terminal ballistic junctions (TBJs) are fabricated from a high-mobility InP/In0.75Ga0.25As heterostructure by electron-beam lithography. The voltage output from the central branch is measured as a function of the voltages applied to the left and right branches of the TBJs. The measurements show that the TBJs possess an intrinsic nonlinearity. Based on this nonlinearity, a novel room-temperature functional frequency mixer and phase detector are realized. The TBJ frequency mixer and phase detector are expected to have advantages over traditional circuits in terms of simple structure, small size and high speed, and can be used as a new type of building block in nanoelectronics.

Silicon thin films prepared in the transition region and their use in solar cells

Diphasic silicon films (nc-Si/a-Si:H) have been prepared by a new regime of plasma enhanced chemical vapour deposition in the region adjacent of phase transition from amorphous to microcrystalline state. Comparing to the conventional amorphous silicon (a-Si:H), the nc-Si/a-Si:H has higher photoconductivity (sigma(ph)), better stability, and a broader light spectral response range in the longer wavelength range. It can be found from Raman spectra that there is a notable improvement in the medium range order. The blue shift for the stretching mode and red shift for the wagging mode in the IR spectra also show the variation of the microstructure. By using this kind of film as intrinsic layer, a p-i-n junction solar cell was prepared with the initial efficiency of 8.51 % and a stabilized efficiency of 8.01% (AM 1.5, 100 mw/cm(2)) at room temperature. (c) 2006 Published by Elsevier B.V.

半导体科学与技术

本书是在国家自然科学基金委员会信息科学部的支持下，邀请了三十余位工作在半导体研究领域第一线的知名专家撰写而成的。本书系统介绍了当前国际、国内半导体科学和技术各个领域，包括半导体材料的生长、物理问题、重要实验和理论结果、器件结构和应用等方面的基础知识、研究现状、发展趋势和有待解决的关键问题。 本书适合从事半导体研究和教学的大学教师、科技工作者、工程技术人员、研究生、本科生以及科技管理部门有关工作人员和管理专家阅读和参考。

Silicon thin films prepared in the transition region and their use in solar cells

Diphasic silicon films (nc-Si/a-Si:H) have been prepared by a new regime of plasma enhanced chemical vapour deposition in the region adjacent of phase transition from amorphous to microcrystalline state. Comparing to the conventional amorphous silicon (a-Si:H), the nc-Si/a-Si:H has higher photoconductivity (sigma(ph)), better stability, and a broader light spectral response range in the longer wavelength range. It can be found from Raman spectra that there is a notable improvement in the medium range order. The blue shift for the stretching mode and red shift for the wagging mode in the IR spectra also show the variation of the microstructure. By using this kind of film as intrinsic layer, a p-i-n junction solar cell was prepared with the initial efficiency of 8.51 % and a stabilized efficiency of 8.01% (AM 1.5, 100 mw/cm(2)) at room temperature. (c) 2006 Published by Elsevier B.V.

基于汽车检测线的实时网络监控系统

在介绍汽车检测线系统的基础上,探讨了实时网络监控在汽车检测线上的应用,为了克服检测过程存在较多人为因素的缺点和解决汽车检测场社会化引起的监管问题,提出了通过控制摄像头多角度拍摄监控照片对被检车辆进行身份认证的新方法,该方法可以方便异地监控端实时了解汽车检测线上的各类检测情况,并且有助于保证检测过程的真实有效性

野桂花的化学成分研究

首次从野桂花（Osmanthus yunnanensis Fr. P. S. Green）地上部分95%乙醇提取物中通过色谱分离得到20个化合物, 其中化合物20为新化合物。基于波谱数据它们被鉴定为(E)-阿魏酸二十烷基酯(1)、β-谷甾醇(2)、羽扇豆醇(3)、齐墩果酸(4)、7-oxo-β-sitosterol(5)、乙酰齐墩果酸(6)、(6′-O-palmitoyl)-sitosterol 3-O-β-D-glucoside(7)、rotundioic acid(8)、地榆糖甙Ⅱ(9)、27-O-(E)-对羟基肉桂酰-28-齐墩果酸(10)、27-O-(Z)-对羟基肉桂酰-28-齐墩果酸(11)、hycandinic acid ester(12)、绿原酸丁酯(13)、4,5-二咖啡酰奎尼酸丁酯(14)、4,5-dihydroxyprenyl caffeate(15)、28-O-β-D-glucopyranosyl rotundioic acid (16)、4-(6-O-caffeoyl-β-D-glucopyranosyloxy)-5-hydroxyprenyl caffeate (aohada-glycoside C, 17)、 4-β-D-glucopyranosyloxy-5-hydroxy-prenyl caffeate (aohada-glycoside A, 18)、β-胡萝卜甙(19)以及3-[O-β-D-(6-O-咖啡酰吡喃葡萄糖)]-甲基-2-烯-γ-内酯 (20)。化合物13、14、15和17有较强的α-葡萄糖甙酶抑制活性。当浓度为1 mg/ml时，它们对α-葡萄糖甙酶的抑制分别为61.5%、95.5%、72.1%、62.6%，活性高于阿卡波糖。 综述了木犀属植物化学成分及1993年以来苯丙素甙类化合物活性研究进展。 Twenty compounds were isolated from the 95% ethanol extract of the aerial parts of Osmanthus yunnanensis Fr. P. S. Green by chromatography for the first time. On the basis of spectral data, they were identified as (E)-ferulic acid eicosyl ester (1), β-sitosterol (2), lupenol (3), oleanolic acid (4), 7-oxo-β-sitosterol (5), acetyloleanolic acid (6), (6′-O-palmitoyl)-sitosterol 3-O-β-D-glucoside (7), rotundioic acid (8), ziyu glycosideⅡ (9), 3β-hydroxy-27-p-(E)-coumaroyloxy-olean-12-en-28-oic acid (10), 3β-hydroxy-27-p-(Z)-coumaroyloxyolean-12-en-28-oic acid (11), hycandinic acid ester (12), chlorogenic acid butyl ester (13), 4,5-di-O-caffeoylquinic acid butyl ester (14), 4,5-dihydroxyprenyl caffeate (15), 28-O-β-D-glucopyranosyl rotundioic acid (16), 4-(6-O-caffeoyl-β-D-glucopyranosyloxy)-5-hydroxyprenyl caffeate (aohada- glycoside C, 17), 4-β-D-glucopyranosyloxy-5-hydroxyprenyl caffeate (aohada- glycoside A, 18), β-daucosterol(19) and 3-[O-β-D-(6-O-caffeoylglucopyranosyl)]- methyl-2-en-γ-lactone (20). Compound 20 is a new one. Compounds 13, 14, 15 and 17 inhibit α-glucosidase with corresponding inhibitory rate of 61.5%, 95.5%, 72.1% and 62.6% at a concentration of 1 mg/ml, higher than acarbose. The chemical studies on Osmanthus genus and bioactivities of phenylpropanoid glycosides were summarized.