具有圆弧裂纹载流薄板的温度效应分析

给出含有圆弧裂纹的载流薄板在通入强大脉冲电流瞬间,裂纹尖端处温度场分布的复变函数解.该解是在首先求解通电瞬间,裂纹尖端处所形成的点热源功率的情况下得到的.它为进一步求解裂纹尖端处的应力场奠定了基础.文中给出的算例表明,适当控制通入的电流强度,可以达到有效控制裂尖熔化区尺寸以及形成焊口的目的.

延迟型毫微秒级高压脉冲驱动器

本发明涉及一种延迟型毫微秒级高压脉冲驱动器，包括脉冲信号源、高压充电驱动器和放电驱动器；其中高压充电驱动器包括上升沿成形器、上升沿高压驱动器；放电驱动器包括下降沿延迟成形器和下降沿驱动器；由脉冲信号源产生的脉冲信号分成两路，其中一路与高压充电驱动器相连，另一路与放电驱动器相连，充、放电驱动器的输出构成一个完整的高压脉冲信号至负载；本发明可在容性负载上瞬间建立和撤消高压、并使其调制的信号的频率、脉宽可调。

抗艾滋病的药物组合物及其应用

一种抗艾滋病的药物组合物，其中含有抗艾滋病有效量的式（Ⅰ） 化合物β－硝基苯乙烯及可药用载体和／或赋形剂。$上述药物组合物在制备逆转录酶抑制剂药物中的应用；上述药物组合物在制备抗艾滋病药物中的应用.

猕猴大脑神经元多单位电活动室外记录系统

本发明涉及一种猕猴大脑神经元多单位电活动室外记录系统，属神经电生理学领域。该系统由用螺钉固定在猕猴颅骨表面(17)上的微型记录平台(6)及微型记录平台(6)上的装置、通过电缆(5)连接的手提便携式仪器箱(11)组成；微型记录平台(6)上的装置包括微电极微型推进器(3)、分别与电缆(5)连接的动物行为记录摄像机(1)、微型视频眼动记录仪(2)和微电极放大器(4)；与电缆(5)连接的手提便携式仪器箱(11)包括四分频视信号合成仪(7)、主放大器(8)、八合一神经信号单片机处理系统(9)、8mm磁带记录仪(10)该系统具有可以高效地在室外、野外进行猕猴大脑神经元多单位放电记录的优点，还具有体积小、重量轻、抗干扰性强等优点。

水迷宫大鼠脑内记录神经元放电的装置

本发明涉及一种水迷宫大鼠脑内记录神经元放电的装置，属神经电生理学实验装置。该装置由固定在大鼠头上的微电极微推进器(2)，固定在微电极微推进器(2)的保护盒(12)上的前置放大器(3)，通过电缆(5)与前置放大器(3)的输出端相连的后置放大器(6)，与后置放大器(6)的输出端相连的滤波器(7)，分别与滤波器(7)和摄像镜头(1)连接的行为、电生理数据记录系统(8)组成。具有能够在大鼠进行水迷宫训练及测试的同时，记录并观察大鼠脑内相关神经元电活动情况，所用装置防水性能良好、抗干扰性强，结构轻便，实用性强等优点。

Intraspecific phylogeography of Carchesium polypinum (Peritrichia, Ciliophora) from China, inferred from 18S-ITS1-5.8S ribosomal DNA

Based on the variation of site 34, 46, 241, 305 and 322 in the 18S-ITS1 rDNA sequence, 19 Carchesium polypinum populations collected from eight provinces of China were separated into northern and southern population along the delineation between the Yangtze River and the Pearl River. This geographic distribution pattern of Carchesium polypinum maybe results from two factors: the vicariance resulting from the formation of the delineation between the Pearl River and the Yangtze River accompanied with the uplift of Qinghai-Xizang Plateau, and the different dispersal paths of C. polypinum affected by the climate.

Exogenous carbon acquisition of photosynthesis in Porphyra haitanensis (Bangiales, Rhodophyta) under emersed state

The photosynthetic performances of Porphyra haitanensis thalli were investigated in order to understand its mechanisms for exogenous carbon acquisition during emersion at low tide. The emersed photosynthesis was studied by altering the pH value in the water film on the thalli surface, treating them with carbonic anhydarase inhibitors (acetazolamide and 6-ethoxyzolamide), adjusting the CO2 concentrations in the air, and comparing the theoretical maximum CO2 supply rates within the adherent water film with the observed photosynthetic CO2 uptake rates. It was found that the principal exogenous inorganic carbon source for the photosynthesis of P. haitanensis during emersion was atmospheric CO2. The driving force of CO2 flux across the water film was the CO2 concentration gradient within it. Carbonic anhydrase accelerated both extracellular and intracellular CO2 transport. The emersed photosynthesis of P. haitanensis was limited by the present atmospheric CO2 level, and would be enhanced by atmospheric CO2 rise that would trigger global warming.

alr0117, a two-component histidine kinase gene, is involved in heterocyst development in Anabaena sp PCC 7120

Anabaena sp. PCC; 7120 was mutagenized by transposon Tn5-1087b, generating a mutant whose heterocysts lack the envelope polysaccharide layer. The transposon was located between nucleotides 342 and 343 of alr0117, a 918 bp gene encoding a histidine kinase for a two-component regulatory system. Complementation of the mutant with a DNA fragment containing alr0117 and targeted inactivation of the gene confirmed that alr0117 is involved in heterocyst development. RT-PCR showed that alr0117 was constitutively expressed in the presence or absence of a combined-nitrogen source. hepA and patB, the two genes turned on during wild-type heterocyst development, were no longer activated in an alr0117-null mutant. The two-component signal transduction system involving alr0117 may control the formation of the envelope polysaccharide layer and certain late events essential to the function of heterocysts.

New species of Doliodrilus and other Limnodriloidinae (Oligochaeta, Tubificidae) from Hainan and other parts of the north-west Pacific Ocean

Thirteen species of Limnodriloidinae (Tubificidae) are recorded from marine and brackish-water habitats of Hainan Island, southern China, including 11 species of Doliodrilus and two species belonging to Limnodriloides . Eight species are new to science: D. bisaccus sp. n. (types from Japan), D. longidentatus sp. n. (types from Hong Kong), D. ciliatus sp. n., D. adiacens sp. n., D. fibrisaccus sp. n. (also from Fiji), D. brachyductus sp. n., D. bidolium sp. n. and D. chinensis sp. n. In addition, material of D. puertoricensis Erseus and Milligan, 1988, from New Caledonia, is briefly described. This study shows that Doliodrilus is unexpectedly species-rich in Asian seas, in particular, around Hainan. Including an unnamed species from this island, the known members of this genus increase from three to 12.

一种制作白光发光二极管的方法

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High-temperature AlN interlayer for crack-free AlGaN growth on GaN

This paper presents a study of the transformation of high-temperature AlN (HT-AlN) interlayer (IL) and its effect on the strain relaxation of Al0.25Ga0.75N/HT-AlN/GaN. The HT-AlN IL capped with Al0.25Ga0.75N transforms into AlGaN IL in which the Al composition increases with the HT-AlN IL thickness while the total Ga content keeps nearly constant. During the HT-AlN IL growth on GaN, the tensile stress is relieved through the formation of V trenches. The filling up of the V trenches by the subsequent Al0.25Ga0.75N growth is identified as the Ga source for the IL transformation, whose effect is very different from a direct growth of HT-AlGaN IL. The a-type dislocations generated during the advancement of V trenches and their filling up propagate into the Al0.25Ga0.75N overlayer. The a-type dislocation density increases dramatically with the IL thickness, which greatly enhances the strain relaxation of Al0.25Ga0.75N. (c) 2008 American Institute of Physics.

The Kiloparsec-scale structure of 3C 286

We present radio images of the compact steep spectrum (CSS) quasar 3C 286 acquired with the Very Large Array (VLA) at 8.4 and 22.5 GHz. The source exhibits a two-sided core-jet structure with a bright central component and two extended components one to the east (P.A. 100degrees) and another to the southwest (P.A. -116degrees). From the compact core, an extension runs towards the southwest component up to similar to 0.7 arcsecond. The emission between the primary central component and the southwest component exhibits a knotty structure. A gradual change of the jet position angles from -135degrees to -120degrees in the inner southwest jet suggests a local bend. The position angle changes of the major eastern components E2 and E1 suggest that the eastern jet likely follows a curved trace. The bends in the jet trace may be associated with a relativistic precession or some interaction between the jet and the ambient matter. A mean spectral index of alpha(8.4)(22.5) similar to -0.76 (S-nu proportional to nu(alpha)) is estimated for the core component. Steep spectra are also obtained for the extended southwest component (2.6", P.A. -116degrees) and eastern component (0.8", P.A. 100degrees), with alpha(8.4)(22.5) similar to -0.88 and alpha(8.4)(22.5) similar to -1.79, respectively. The radio morphologies and spectral index distributions suggest that the core seen in our images is likely to be the beamed inner jet while the real nucleus is dimmed by it beaming away from us.