广东闸坡潮间带大型底栖动物的群落特征

分析了广东省闸坡潮间带生物的种类组成、数量分布和生物多样性等特点。结果表明,该海域潮间带调查采获的潮间带生物标本共55科80种,以软体动物和甲壳类出现的种类最多,两者占了总种类数的85%,其中部分属经济价值较高的种类。潮间带生物总平均生物量为7 420.92 g/m2,总平均栖息密度为3 929.93 ind/m2。全年各类群生物中,平均生物量及栖息密度都以软体动物居首位。其Shannon-Weaner多样性指数(H)属中等水平,分布范围在1.657～4.226,平均为2.848;均匀度(J′)为0.390～0.721,平均为0.612;种类丰度(D)为2.062～4.234,平均为2.964。     

新课程背景下小学数学教学的几点感悟

新课程的实施给学校和教师提出了新的要求,带来了新的变化。新课程更好地体现了教师是学习活动的合作者、引导者、参与者,新课程提倡自主学习,让学生成为课堂的主角,促进学生个性全面发展。同时新课程更好地实现了教学价值评价标准的多元化。     

视障大学生意志力的培养与体育教学

残疾大学生的体育教育是有别于正常学生的具有自身特点的特殊教育过程,也是我国学校体育教育的有机组成部分。残疾人体育活动的心理特点所营造的是战胜和超越自我的环境和信念。本文主要通过体育锻炼对视障大学生的意志力和心理应付能力及自信心进行训练和培养。     

积极开展工程专业资格认证、大力提高工程硕士培养质量

本文首先进行背景介绍,并介绍了有关国内外开展工程领域专业资格认证的现状,进而提出了我国开展工程专业资格认证的基本思路和具体措施。     

自来水业价格规制改革中存在问题与对策

价格规制改革是我国自来水业规制改革的核心内容,目前仍存在着沓价低、水资源费和污水处理费征收不到位、计费方式单一、定价程序欠规范等问题,需要从完善全成本覆盖价格体系和污水处理费的征收制度、改革自来水计费方式、规范自来水业定价程序等方面进行改革,以推动自来水业规制改革健康、有序进行.     

Estimating Fatty Acid Composition of Infant Buccal Mucosal Cells by Capillary Gas Chromatography

Long chain polyunsaturated fatty adds, i. e., docosahexaenoic acid （DHA or C22 ： 6n - 3）, amchidonic acid （AA or C20 ： 4n -6） have been identified as essential fatty acids and play an important role in growth and development of infants. Measurement of fatty acid composition is usually by collection of blood, but to obtain blood in infants is difficult. Nowadays, the fatty acid composition can be estimated by collecting buccal mucosal cells, which can avoid repeated blood sampling. The of this paper is to compare the fatty acid composition of cheek cells with that of plasma and red blood cells （RBCs）. In this study, twenty-seven infants were enrolled, and buccal mucosal cells and blood samples were obtained from these infants of the same time. Fatty acid composition of buccal mucosal cells, plasma and RBCs were measured by capillary gas chromatography. The results show that the contents of AA and DHA in the buccal macosal cells are correlated well with that in the plasma [r=0.36 （P=0.042） and r =0.38 （P =0.033）, respectively]. The ratio of AA to DHA is 1.32% in buccal mucosal cells, 1.60% in plasma and 1.55% in RBCs and there are no significant differences among groups （P = 0.134）. It shows that the fatty acid composition in buccal macosal cells can reflect the fat nutrition status in infants and can be detected by capillary gas chromatography. Estimating fatty acid composition of buceal mucosal cells in infants by capillary gas chromatography is feasible, and because of its noninvasiveness, it can be suitable for nutrition research in infants.     

A New Method of Color Edge Detection Based on Local Structure Analysis

Human＇s real life is within a colorful world. Compared to the gray images, color images contain more information and have better visual effects. In today＇s digital image processing, image segmentation is an important section for computers to ＂understand＂ images and edge detection is always one of the most important methods in the field of image segmentation. Edges in color images are considered as local discontinuities both in color and spatial domains. Despite the intensive study based on integration of single-channel edge detection results, and on vector space analysis, edge detection in color images remains as a challenging issue.     

基于途径分析的L-苏氨酸发酵过程优化

以L-苏氨酸生产菌株TRFC为供试菌株,在拟稳态下基于途径分析对发酵过程作出理论分析,并对发酵过程进行优化.通过途径分析方法确定L-苏氨酸合成代谢途径的11种基本模型,其中模型1、3、4、6、9、11最高理论产率为86%.根据途径分析结果,提出L-苏氨酸产生菌的发酵控制策略,并进行摇瓶及发酵罐实验验证.结果表明:在添加葡萄糖酸钠发酵过程中,L-苏氨酸产量与葡萄糖为唯一碳源时相比反而降低;且充分供氧达20%时,代谢流大量涌入目的产物,L-苏氨酸产率最大.     

高寒地区混凝土重力坝温控防裂研究

针对雅鲁藏布江中游段特殊的高原气候条件,根据重力坝的施工进度计划,对混凝土重力坝施工期和运行期的温度场、应力场进行了动态的仿真计算.研究了在不同季节开始浇筑坝体混凝土时坝体约束区的应力场、施工期闸墩的应力场和冬季开始浇筑坝体的整体应力场;根据浇筑季节的不同、混凝土材料的不同、约束强弱的不同和经济实用的原则制定了相应的温控措施,保证坝体在施工期和运行期的安全.     

自来水业价格规制改革中存在问题与对策

价格规制改革是我国自来水业规制改革的核心内容,目前仍存在着沓价低、水资源费和污水处理费征收不到位、计费方式单一、定价程序欠规范等问题,需要从完善全成本覆盖价格体系和污水处理费的征收制度、改革自来水计费方式、规范自来水业定价程序等方面进行改革,以推动自来水业规制改革健康、有序进行.