饱和软基爆炸排水机理的初步研究

在现场实验研究的基础上，提出了饱和两相介质在爆炸动载下排水固结机理的一维简化模型。数值计算结果表明在强动载作用下，土层中两相介质由于运动惯性不同，两者会出现分离运动，土体的排水速度与两相介质的运动有关。动载作用后两相介质仍具有较大的惯性，继续排水，这与静载下是不同的。土中孔隙压力的变化与两相介质运动有关，计算值与实测值在量级上有可比性。

Beam conditions for radiation generated by an electromagnetic J 0-correlated Schell-model source

Based on the 2 x 2 (electric field) cross-spectral density matrix, a model for an electromagnetic J(0)-correlated Schell-model beam is given that is a generalization of the scalar J(0)-correlated Schell-model beam. The conditions that the matrix for the source to generate an electromagnetic J(0)-correlated Schell-model beam are obtained. The condition for the source to generate a scalar J(0)-correlated Schell-model beam can be considered as a special case. (C) 2008 Optical Society of America

横斑腹小—新亚种—杂斑腹小xiao(xiao形目: chixiao科)

在横断山区鸟类考察中,发现采自四川宝兴县硗碛和雅江县八角楼的两号小xiao属标本与原记录的一些种类有显著差异,而与该属的横斑腹小xiao相 似。但该标本与横斑腹小xiao原亚种区别亦明显,如:腹部呈斑杂状,横斑不规整;喉部、前颈和颈侧不为白色;第1枚初级飞羽显著较6、7故为短。这些特 征有似于种级的分化,但因资料尚不完备,故暂以横斑腹小xiao的一新亚种报道,命名为杂斑腹小xiao以示区别。图2参10

Enhanced protection against oxidative stress in an astaxanthin-overproduction Haematococcus mutant (Chlorophyceae)

Many unicellular green algae can become yellow or red in various natural habitats due to mass accumulation of a secondary carotenoid, such as lutein, or astaxanthin. The accumulation of secondary carotenoids is generally thought to be a survival strategy of the algae under photo-oxidative stress or other adverse environmental conditions. The physiological role of the carotenoids in stress response is less well understood at the subcellular or molecular level. In this study, a stable astaxanthin overproduction mutant (MT 2877) was isolated by chemical mutagenesis of a wild type (WT) of the green microalga Haematococcus pluvialis Flotow NIES-144. MT 2877 was identical to the WT with respect to morphology, pigment composition, and growth kinetics during the early vegetative stage of the life cycle. However, it had the ability to synthesize and accumulate about twice the astaxanthin content of the WT under high light, or under high light in the presence of excess amounts of ferrous sulphate and sodium acetate. Under stress, the mutant exhibited higher photosynthetic activities than the WT, based on considerably higher chlorophyll fluorescence induction, chlorophyll autofluorescence intensities, and oxygen evolution rates. Cell mortality caused by stress was reduced by half in the mutant culture compared with the WT. Enhanced protection of the mutant against stress is attributed to its accelerated carotenogenesis and accumulation of astaxanthin. Our results suggest that MT 2877, or other astaxanthin overproduction Haematococcus mutants, may offer dual benefits, as compared with the wild type, by increasing cellular astaxanthin content while reducing cell mortality during stress-induced carotenogenesis.

光纤耦合用多根输出光纤头

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运算构造和检验系统FC的设计和实现

运算构造和检验系统ＦＣ（ｆｕｎｃｔｉｏｎｃｏｎｓｔｒｕｃｔｏｒ）是形式规约获取系统ＳＡＱ（ｓｐｅｃｉｆｉｃａｔｉｏｎａｃｑｕｉｓｉｔｉｏｎ）的一个子系统．在ＳＡＱ系统中，运算用于表示规约的语义．ＦＣ提供了对运算的交互式归纳定义方式和运算的施用，支持运算的联立递归定义．详细介绍ＦＣ的功能、结构和实现技术，并讨论了下一步的改进方向．

Impact of wide bandgap p-type nc-Si on the performance of a-Si solar cells

This paper reports the impact of a wide bandgap p-type hydrogenated nanocrystalline silicon (nc-Si:H) on the performances of hydrogenated amorphous silicon (a-Si:H) based solar cells. The player consists of nanometer-sized Si crystallites and has a wide effective bandgap determined mainly by the quantum size-confinement effect (QSE). By incorporation of this p-layer into the devices we have obtained high performances of a-Si:H top solar cells with V-infinity=1.045 V and FF=70.3 %, and much improved mid and bottom a-SiGe:H cells, deposited on stainless steel (SS) substrate. The effects of the band-edge mismatch at the p/i-interface on the I-V characteristics of the solar cells arc discussed on the bases of the density-functional approach and the AMPS model.

科尔沁沙地丘间低地植物种间关联研究

丘间低地植物种间关联研究有助于阐述丘间低地植物种间替代的机制。丘间低地面积对植物种间关联关系的影响、沙丘固定对丘间低地植物种间关联关系的影响研究对沙区植被恢复和植物多样性保护具有重要意义。但是，目前还未发现相关研究报道。 作者以科尔沁沙地为研究对象，选择流动沙丘区和固定沙丘区丘间低地面积系列，通过将植物划分为沙生植物、沼泽-草甸植物和草原植物三种生态组群，运用χ2检验和AC关联系数对植物的种间关联关系进行了分析。在流动沙丘区，随丘间低地面积的增大，沙生植物之间的关联性从正关联转变为负关联。当丘间低地面积小于0.5ha时，所有沙生植物之间都呈正关联；当丘间低地面积大于2ha时，所有沙生植物都呈负关联。大部分沙生植物与沼泽-草甸植物之间呈强烈的负关联。在固定沙丘区，随丘间低地面积的增大，草原植物之间种间关联表现为关联性从正关联转变为负关联；或始终呈正关联，但关联强度逐渐减小。大部分草原植物与沼泽-草甸植物之间呈强烈的负关联。不管在流动沙丘区还是在固定沙丘区，随丘间低地面积的增大，|AC| ≤ 0.3的种对数占所有种对数的百分比增大，|AC| ≥ 0.7的种对数占所有种对数的百分比减小。当丘间低地面积相同时，固定沙丘区丘间低地中|AC| ≤ 0.3的种对数占所有种对数的百分比小于流动沙丘区，|AC|≥ 0.7的种对数占所有总对数的百分比大于流动沙丘区。 本研究表明：1）丘间低地面积增大导致种间关系松散；2）沙丘固定导致丘间低地植物种间关系更加紧密。

三体核力重排项的同位旋效应

在同位旋相关的Brueckner理论框架内,研究了三体核力重排贡献对同位旋对称势及其动量相关性和密度依赖性的影响,特别是研究了三体核力重排效应对于非对称核物质中质子和中子有效质量同位旋劈裂的影响.结果表明:三体核力重排效应对质子和中子单核子势均具有排斥性,而且其贡献随动量和密度增加而迅速增大.在低密度区域,三体核力重排贡献对同位旋对称势的影响相当小,然而随着密度的升高,三体核力重排效应的贡献显著增强.在高密度区域,三体核力重排效应使得同位旋对称势明显增大,而且当密度足够高时,三体核力重排贡献甚至导致对称势的动量相关性质发生改变.三体核力的重排效应对核子有效质量同位旋依赖性的影响是使高密度丰中子核物质中质子-中子有效质量同位旋劈裂的幅度显著减小.

香港暴雨中心迁移与滑坡位置关系分析

香港地区每年均有一定数量的滑坡灾害发生,诱发滑坡灾害的主要因子是强降水,即暴雨。暴雨过程中,降水强度的时空分布存在一定差异性,这种降水强度的时空与滑坡灾害的时空分布存在一定的联系。以香港地区1992年5月8日暴雨为例,以30min为时间间隔,分析了暴雨中心时空变动与滑坡事件时空分布及出现频率之间的关系,发现空间上滑坡均出现在暴雨中心或暴雨中心的边沿地区;时间上滑坡事件出现在暴雨中心出现或上一阶段时间内;并且降水的强度与滑坡的出现频率也有一定关系。

一种炭织物分子筛及其制备方法

一种炭织物分子筛其性能为比表面积：３００～１０００ｍ↑［２］／ｇ；微孔率：０．７ｍｍ以下的微孔率大于６０％；孔容积：０．１５－０．３５ｍｌ／ｇ，该分子筛是采用有机纤维或其织物为原料进行炭化后用水蒸气作为活性剂，再进行活化处理制得的。本发明具有丰富的微孔，吸、脱附快，分离得到的甲烷气纯度超过９６％。