103 resultados para tr SEIRAS
em Chinese Academy of Sciences Institutional Repositories Grid Portal
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Measurement while drilling (MWD) has become a popular survey technology to monitor directional data, drilling data, formation evaluation data and safety data in the world. And closed loop drilling shows promise in recent years. Obviously, the method of tr
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This book elucidates the methods of molecular gas dynamics or rarefied gas dynamics which treat the problems of gas flows when the discrete molecular effects of the gas prevail under the circumstances of low density, the emphases being stressed on the basis of the methods, the direct simulation Monte Carlo method applied to the simulation of non-equilibrium effects and the frontier subjects related to low speed microscale rarefied gas flows. It provides a solid basis for the study of molecular gas dynamics for senior students and graduates in the aerospace and mechanical engineering departments of universities and colleges. It gives a general acquaintance of modern developments of rarefied gas dynamics in various regimes and leads to the frontier topics of non-equilibrium rarefied gas dynamics and low speed microscale gas dynamics. It will be also of benefit to the scientific and technical researchers engaged in aerospace high altitude aerodynamic force and heating design and in the research on gas flow in MEMS
| [1] Molecular structure and energy states | (21) | tr><tr> | tr><tr> | [2] Some basic concepts of kinetic theory | (51) | tr><tr> | tr><tr> | [3] Interaction of molecules with solid surface | (131) | tr><tr> | tr><tr> | [4] Free molecular flow | (159) | tr><tr> | tr><tr> | [5] Continuum models | (191) | tr><tr> | tr><tr> | [6] Transitional regime | (231) | tr><tr> | tr><tr> | [7] Direct simulation Monte-Carlo (DSMC) method | (275) | tr><tr> | tr><tr> | [8] Microscale slow gas flows, information preservation method | (317) | tr><tr> | tr><tr> | [App. I] Gas properties | (367) | tr><tr> | tr><tr> | [App. II] Some integrals | (369) | tr><tr> | tr><tr> | [App. III] Sampling from a prescribed distribution | (375) | tr><tr> | tr><tr> | [App. IV] Program of the couette flow | (383) | tr><tr> | tr><tr> | Subject Index | (399) | tr> |
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本书为祝贺郑哲敏先生八十华诞的学术报告会的文集，其中收录邀请报告12篇，定向征文58篇。这些论文涉及爆炸力学、岩土力学、冲击力学、材料力学性能、生物力学、物理力学、海洋工程力学、环境流体力学等几大方面，绝大多数为论文作者科研项目的最新成果。
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序 | 洪友士; | tr> <tr align="left" height="40" valign="middle"> |
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内禀Deborah数在破坏现象中的意义 | 白以龙;汪海英; | tr> <tr align="left" bgcolor="#e9ffff" height="40" valign="middle"> |
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爆炸波在混凝土夹层结构中传播特性分析 | 段祝平; | tr> <tr align="left" height="40" valign="middle"> |
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海洋内波与海洋工程 | 李家春;程友良;范平; | tr> <tr align="left" bgcolor="#e9ffff" height="40" valign="middle"> |
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郑哲敏先生为推动我国力学和技术科学发展所作的贡献 | 谈庆明; | tr> <tr align="left" height="40" valign="middle"> |
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开发深海资源的海底空间站技术 | 曾恒一; | tr> <tr align="left" bgcolor="#e9ffff" height="40" valign="middle"> |
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微系统动力学研究的一些新进展 | 赵亚溥; | tr> <tr align="left" height="40" valign="middle"> |
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爆炸近区空气冲击波规则反射和非规则反射 | 周丰峻;陈叶青;任辉启; | tr> <tr align="left" bgcolor="#e9ffff" height="40" valign="middle"> |
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椭圆函数的精细积分算法 | 钟万勰;姚征; | tr> <tr align="left" height="40" valign="middle"> |
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量子蒙特卡罗法的研究 | 孙祉伟; | tr> <tr align="left" bgcolor="#e9ffff" height="40" valign="middle"> |
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拟Hamilton系统随机平均法在活性布朗粒子动力学研究中的应用 | 朱位秋;邓茂林; | tr> <tr align="left" height="40" valign="middle"> |
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二个二阶张量的各向同性标量函数的广义坐标 | 王文标;段祝平; | tr> <tr align="left" bgcolor="#e9ffff" height="40" valign="middle"> |
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弹性杆轴向碰撞波动问题理论分析 | 马炜;刘才山;黄琳; | tr> <tr align="left" height="40" valign="middle"> |
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两个可变形结构的相互碰撞——模型与验证 | 余同希;阮海辉; | tr> <tr align="left" bgcolor="#e9ffff" height="40" valign="middle"> |
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结构动力计算中自由度减缩方法概述 | 刘彬;丁桦;梁乃刚; | tr> <tr align="left" height="40" valign="middle"> |
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弹塑性系统动力行为探讨 | 杨桂通; | tr> <tr align="left" bgcolor="#e9ffff" height="40" valign="middle"> |
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SINGULARITY THEORY ON BUCKLING OF COMPRESSIBLE ELASTIC SLENDER RODS | 张义同;谢宇新; | tr> <tr align="left" height="40" valign="middle"> |
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GCr15钢超高周疲劳断口观察与裂纹起源分析 | 周承恩;洪友士; | tr> <tr align="left" bgcolor="#e9ffff" height="40" valign="middle"> |
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纳米尺度毛细作用学——纳米物理力学的新领域 | 朱如曾; | tr> <tr align="left" height="40" valign="middle"> |
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METALLIC CELLULAR SOLIDS UNDER IMPACT LOADING | H.Zhao;S.Abdennadher;I.Elnasri; | tr> |
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Adiabatic shear localization is a mode of failure that occurs in dynamic loading. It is characterized by thermal softening occurring over a very narrow region of a material and is usually a precursor to ductile fracture and catastrophic failure. This reference source is the first detailed study of the mechanics and modes of adiabatic shear localization in solids, and provides a systematic description of a number of aspects of adiabatic shear banding. The inclusion of the appendices which provide a quick reference section and a comprehensive collection of thermomechanical data allows rapid access and understanding of the subject and its phenomena. The concepts and techniques described in this work can usefully be applied to solve a multitude of problems encountered by those investigating fracture and damage in materials, impact dynamics, metal working and other areas. This reference book has come about in response to the pressing demand of mechanical and metallurgical engineers for a high quality summary of the knowledge gained over the last twenty years. While fulfilling this requirement, the book is also of great interest to academics and researchers into materials performance.Table of Contents
| 1 | Introduction | 1 | tr><tr id="yui_3_7_3_1_1356267270901_1334">1.1 | What is an Adiabatic Shear Band? | 1 | tr><tr id="yui_3_7_3_1_1356267270901_1336">1.2 | The Importance of Adiabatic Shear Bands | 6 | tr><tr id="yui_3_7_3_1_1356267270901_1338">1.3 | Where Adiabatic Shear Bands Occur | 10 | tr><tr id="yui_3_7_3_1_1356267270901_1340">1.4 | Historical Aspects of Shear Bands | 11 | tr><tr id="yui_3_7_3_1_1356267270901_1422">1.5 | Adiabatic Shear Bands and Fracture Maps | 14 | tr><tr id="yui_3_7_3_1_1356267270901_1565">1.6 | Scope of the Book | 20 | tr><tr id="yui_3_7_3_1_1356267270901_1569">2 | Characteristic Aspects of Adiabatic Shear Bands | 24 | tr><tr id="yui_3_7_3_1_1356267270901_1593">2.1 | General Features | 24 | tr><tr id="yui_3_7_3_1_1356267270901_1573">2.2 | Deformed Bands | 27 | tr><tr id="yui_3_7_3_1_1356267270901_1591">2.3 | Transformed Bands | 28 | tr><tr id="yui_3_7_3_1_1356267270901_1589">2.4 | Variables Relevant to Adiabatic Shear Banding | 35 | tr><tr id="yui_3_7_3_1_1356267270901_1575">2.5 | Adiabatic Shear Bands in Non-Metals | 44 | tr><tr>3 | Fracture and Damage Related to Adiabatic Shear Bands | 54 | tr><tr>3.1 | Adiabatic Shear Band Induced Fracture | 54 | tr><tr>3.2 | Microscopic Damage in Adiabatic Shear Bands | 57 | tr><tr>3.3 | Metallurgical Implications | 69 | tr><tr>3.4 | Effects of Stress State | 73 | tr><tr>4 | Testing Methods | 76 | tr><tr>4.1 | General Requirements and Remarks | 76 | tr><tr>4.2 | Dynamic Torsion Tests | 80 | tr><tr>4.3 | Dynamic Compression Tests | 91 | tr><tr id="yui_3_7_3_1_1356267270901_1605">4.4 | Contained Cylinder Tests | 95 | tr><tr id="yui_3_7_3_1_1356267270901_1607">4.5 | Transient Measurements | 98 | tr><tr>5 | Constitutive Equations | 104 | tr><tr>5.1 | Effect of Strain Rate on Stress-Strain Behaviour | 104 | tr><tr>5.2 | Strain-Rate History Effects | 110 | tr><tr>5.3 | Effect of Temperature on Stress-Strain Behaviour | 114 | tr><tr id="yui_3_7_3_1_1356267270901_1609">5.4 | Constitutive Equations for Non-Metals | 124 | tr><tr id="yui_3_7_3_1_1356267270901_1611">6 | Occurrence of Adiabatic Shear Bands | 125 | tr><tr>6.1 | Empirical Criteria | 125 | tr><tr>6.2 | One-Dimensional Equations and Linear Instability Analysis | 134 | tr><tr>6.3 | Localization Analysis | 140 | tr><tr>6.4 | Experimental Verification | 146 | tr><tr>7 | Formation and Evolution of Shear Bands | 155 | tr><tr>7.1 | Post-Instability Phenomena | 156 | tr><tr>7.2 | Scaling and Approximations | 162 | tr><tr>7.3 | Wave Trapping and Viscous Dissipation | 167 | tr><tr>7.4 | The Intermediate Stage and the Formation of Adiabatic Shear Bands | 171 | tr><tr>7.5 | Late Stage Behaviour and Post-Mortem Morphology | 179 | tr><tr>7.6 | Adiabatic Shear Bands in Multi-Dimensional Stress States | 187 | tr><tr>8 | Numerical Studies of Adiabatic Shear Bands | 194 | tr><tr id="yui_3_7_3_1_1356267270901_1613">8.1 | Objects, Problems and Techniques Involved in Numerical Simulations | 194 | tr><tr>8.2 | One-Dimensional Simulation of Adiabatic Shear Banding | 199 | tr><tr>8.3 | Simulation with Adaptive Finite Element Methods | 213 | tr><tr>8.4 | Adiabatic Shear Bands in the Plane Strain Stress State | 218 | tr><tr id="yui_3_7_3_1_1356267270901_1615">9 | Selected Topics in Impact Dynamics | 229 | tr><tr id="yui_3_7_3_1_1356267270901_1617">9.1 | Planar Impact | 230 | tr><tr>9.2 | Fragmentation | 237 | tr><tr>9.3 | Penetration | 244 | tr><tr>9.4 | Erosion | 255 | tr><tr>9.5 | Ignition of Explosives | 261 | tr><tr>9.6 | Explosive Welding | 268 | tr><tr>10 | Selected Topics in Metalworking | 273 | tr><tr>10.1 | Classification of Processes | 273 | tr><tr>10.2 | Upsetting | 276 | tr><tr>10.3 | Metalcutting | 286 | tr><tr>10.4 | Blanking | 293 | tr><tr>Appendices | 297 | tr><tr>A | Quick Reference | 298 | tr><tr>B | Specific Heat and Thermal Conductivity | 301 | tr><tr id="yui_3_7_3_1_1356267270901_1619">C | Thermal Softening and Related Temperature Dependence | 312 | tr><tr id="yui_3_7_3_1_1356267270901_1623">D | Materials Showing Adiabatic Shear Bands | 335 | tr><tr id="yui_3_7_3_1_1356267270901_1628">E | Specification of Selected Materials Showing Adiabatic Shear Bands | 341 | tr><tr id="yui_3_7_3_1_1356267270901_1630">F | Conversion Factors | 357 | tr><tr id="yui_3_7_3_1_1356267270901_1632">References | 358 | tr><tr id="yui_3_7_3_1_1356267270901_1634">Author Index | 369 | tr><tr id="yui_3_7_3_1_1356267270901_1636">Subject Index | 375 | tr>
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本书收录关于力学领域的论文301篇。内容包括：回顾20世纪力学在中国的发展，描绘了2000年中国和世界在力学各主要领域的发展现状；展望力学在21世纪的发展方向，探论新世纪中可能面临的新的重大力学等问题。
| 前言 | 白以龙;杨卫; | tr><tr height="40" align="left" valign="middle"> | | 力学学科《学科发展与优先领域战略研究报告》 | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 世纪之交对力学的回顾、展望和想象 | 白以龙; | tr><tr height="40" align="left" valign="middle"> | | 计算流体力学中发展物理分析的几个问题 | 张涵信;李沁;宗文刚;张来平; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 非对称Riccati方程基于本征解的分析解 | 钟万勰; | tr><tr height="40" align="left" valign="middle"> | | 实验固体力学近几年的概况 | 伍小平; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | HIGHER-ORDER COHESIVE ELASTICITY THEORIES OF FRACTURE | Anna Vainchtein; | tr><tr height="40" align="left" valign="middle"> | | 疲劳短裂纹群体损伤随机特征研究 | 洪友士;郑亮;乔宇; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 半浮区热毛细对流及其不稳定性机理 | 胡文瑞;唐泽眉; | tr><tr height="40" align="left" valign="middle"> | | ZONAL AND CORRELATION ANALYSIS IN SWEPT SHOCK/BOUNDARY LAYER INTERACTIONS | 邓学蓥; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 经典约束系统动力学的研究进展 | 梅凤翔; | tr><tr height="40" align="left" valign="middle"> | | 复杂系统的非线性动力学问题 | 陆启韶; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 时滞受控系统动力学研究进展 | 胡海岩;王在华; | tr><tr height="40" align="left" valign="middle"> | | 力学与航天器工程 | 马兴瑞;苟兴宇;周志成; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 采矿工程中的力学问题与分析 | 谢和平; | tr><tr height="40" align="left" valign="middle"> | | CHALLENGING PROBLEMS IN FAILURE ANALYSIS OF DUAL-PHASE MATERIALS: CYCLIC MICRO-PLASTICITY AND SMALL FATIGUE CRACK TIP BEHAVIOR | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 力学与国防科技 | 周丰峻; | tr><tr height="40" align="left" valign="middle"> | | 流体力学和气动热弹性力学新一代反命题的研究 | 刘高联; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 含灰气体近壁区流动及传热增强机制分析 | 王柏懿;戚隆溪;王超;江先金; | tr><tr height="40" align="left" valign="middle"> | | 三维定常、二维非定常分离模式及准则研究 | 吕志咏; | tr>
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本书收录会议论文60篇。
本书内容大体分为三类。一类着重介绍了钱学森先生的风范，他的爱国主义，他的勤奋好学，他的治学精神和治学态度，他在学术上的重大贡献以及他的科学思想。第二类是介绍在他的领导或影响下，五十年来我国力学研究取得的成就及进一步的进展。第三类涉及我国力学界正在开展的其他方面的学术研究进展。我们的共同目的是继承优良传统，开拓我国力学在新世纪的发展。
读者对象：力学、航空航天、机械等领域的工程技术人员，研究人员。
| 会议论文 | tr><tr>tr> |
| 学习钱学森先生技术科学思想的体会 | 郑哲敏; | tr><tr height="40" align="left" valign="middle"> | | 国家目标与技术科学——钱学森的力学研究所建所思想 | 吴承康; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 钱学森和中国空气动力研究与发展中心 | 焦安昌;钮颂镛; | tr><tr height="40" align="left" valign="middle"> | | 钱学森教授与近代力学教育 | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 钱学森开创的物理力学之路 | 朱如曾; | tr><tr height="40" align="left" valign="middle"> | | 工程结构优化设计 | 钱令希; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 压电类智能材料与结构的力学分析 | 余寿文;沈亚鹏;匡震邦; | tr><tr height="40" align="left" valign="middle"> | | 一般力学(动力学、振动与控制)研究动态与发展趋势 | 黄文虎;胡超; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 力学系统控制的几个问题 | 黄琳; | tr><tr height="40" align="left" valign="middle"> | | 与物理分析相结合的计算流体力学 | 张涵信;庄逢甘; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 烧蚀防热的非线性气固耦合 | 姜贵庆; | tr><tr height="40" align="left" valign="middle"> | | 湍流的复杂系统论 | 佘振苏;程雪玲; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 纳米力学进展 | 杨卫;郑泉水;方岱宁;黄克智; | tr><tr height="40" align="left" valign="middle"> | | 从简单系统的定量分析到复杂巨系统的综合集成 | 庄逢甘;黄志澄; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 关于力学研究的方法论问题 | 童秉纲; | tr><tr height="40" align="left" valign="middle"> | | 哈密顿原理中时端条件的处理方法及其推广 | 刘高联; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | ASYMMETRIC VORTEX FLOW OVER SLENDER BODIES | 罗时钧; | tr><tr height="40" align="left" valign="middle"> | | 亚、超声喷管中声传播的数值模拟 | 高军辉;李晓东; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 格子Boltzmann数值流体力学 | 冯士德;毛江玉;任荣彩; | tr><tr height="40" align="left" valign="middle"> | | 微型飞行器的仿生流体力学——昆虫产生高升力的机理 | 孙茂;唐剑; | tr>
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郑哲敏文集 |  | tr>
 | tr><tr style="height: 25px">会议论文 | tr><tr>tr> |
| 冯元桢先生贺信 | tr><tr height="40" align="left" valign="middle"> | | A Similarity Law for Stressing Rapidly Heated Thin-Walled Cylinders | H. S. TSIEN;C. M. CHENG; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | ANALYSIS OF PIPE VIBRATIONS WITH INTERNAL FLUID FLOW | tr><tr height="40" align="left" valign="middle"> | | PROBLEMS IN HYDRO-ELASTICITY | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 关于工程地震的若干问题 | 郑哲敏; | tr><tr height="40" align="left" valign="middle"> | | 平板在流体作用下的振动 | 郑哲敏; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | VIBRATION OF PANEL IN THE PRESENCE OF A FLUID | tr><tr height="40" align="left" valign="middle"> | | 悬臂梁在一侧受有液体作用时的自由振动 | 郑哲敏;马宗魁; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 爆炸成形模型律 | 郑哲敏; | tr><tr height="40" align="left" valign="middle"> | | 水中击波入射于平板时空化的形成及其作用 | 郑哲敏; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 球壳的变形计算和能量准则 | 郑哲敏;孙同坤;孙国芳; | tr><tr height="40" align="left" valign="middle"> | | 关于地下爆炸计算模型的一个建议 | 郑哲敏;解伯民; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 破甲过程初步分析及一些基础知识 | 中国科学院力学研究所二室四组; | tr><tr height="40" align="left" valign="middle"> | | 破甲过程初步分析及一些基础知识(续) | 中国科学院力学研究所二室四组; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 破甲机理的力学分析及简化模型(681破甲机理课题进展报告) | 郑哲敏;谈庆明; | tr><tr height="40" align="left" valign="middle"> | | 关于射流侵彻的几个问题 | 郑哲敏; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 聚能射流的稳定性问题 | 郑哲敏; | tr><tr height="40" align="left" valign="middle"> | | 连续介质力学与断裂 | 郑哲敏; | tr><tr height="40" align="left" valign="middle" bgcolor="#e9ffff"> | | 一种非局部弹塑性连续体模型与裂纹尖端附近的应力分布 | 虞吉林;郑哲敏; | tr><tr height="40" align="left" valign="middle"> | | 受压固、气两相介质一维膨胀运动 | 谈庆明;丁雁生;郑哲敏; | tr> |
| 页码： | [1] [2] [3] [4] | tr>
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通过气体交换、荧光猝灭动力学以及反射光谱等技术研究了两个青稞（Hordeum vulgare L.）品种的光合特性及激发能分配。结果表明，青稞的光饱和点1000 μmol m-2 s-1左右。在0～500 μmol m-2 s-1的光强范围里，青稞叶片的光呼吸(Pr)随着光强升高而增加;光强超过500 μmol m-2 s-1以后，光呼吸变化不明显。光呼吸占总光合的比例(Pr/Pm)随光强增强下降。随着光强增强，PSⅡ有效光化学量子效率（Fv′/Fm′），PSⅡ反应中心的实际光化学量子效率（ΦPSⅡ），光化学猝灭系数（qP）不断降低而青稞叶片的非光化学猝灭(NPQ)不断升高，说明越来越多的光能以热耗散的形式耗散掉。光谱分析表明△PRI 随着青稞叶片暴露于光下的时间迅速增大。因此，我们认为光呼吸不是青稞主要的光破坏防御机制，依赖叶黄素循环的热耗散可能是田间青稞耗散过剩光能的主要途径。 通过气体交换、荧光猝灭动力学等技术研究了四种乔木在拉萨和那曲的光合特性及激发能分配。结果表明，四种乔木藏川杨（Populus szechuanica var. tibetica schneid.），银白杨（Populus alba L.），左旋柳(Salix paraplesia var. subintegra C. Wang et P. Y. Pu)，墨竹柳(Salix maizhokunggarensis N. Chao)在拉萨市的光合速率（Pn），叶片气孔导度（Gs），蒸腾速率（Tr）均显著高于那曲。藏川杨和墨竹柳的光下实际光化学效率（ΦPSⅡ）在拉萨显著高于那曲，银白杨和左旋柳的光下实际光化学效率在拉萨和那曲没有显著差异。四种乔木开放反应中心激发能捕获效率（Fv′/Fm′）和天线热耗散（1－Fv′/Fm′）在拉萨和那曲的差异不显著。测量光合时的气温（Tair）拉萨显著高于那曲，除墨竹柳外叶温（Tleaf）也显著高于那曲，墨竹柳的上述两参数在两地间无显著差异。除藏川杨外其余三种乔木在拉萨的胞间二氧化碳浓度（Ci）显著高于那曲，气孔限制值(Ls)显著低于那曲，藏川杨的上述两指标在两地间无显著差异。除墨竹柳外，其余三种乔木在两地的光合（Pn）与叶温（Tleaf）成显著正相关。对银白杨和左旋柳来说，低叶温通过降低气孔导度（Gs）从而降低胞间二氧化碳浓度（Ci）是造成那曲光合低的主要因素之一。对于墨竹柳来说，可能有其他非温度的环境条件影响其气孔导度进而造成气孔限制。此外，叶温可能主要通过非气孔限制来影响藏川杨的光合速率。因此，我们认为在西藏地区不同乔木对海拔高度的响应机制可能不同，但具体机制还需要进一步研究。
Resumo:
A nerve growth factor (NGF) was isolated from the venom of Chinese cobra (Naja naja ntr a) by ion exchange chromatography, gel filtration and fast protein liquid chromatography (FPLC). The N-terminal sequence of 22 amino acid residues was identical with other NGFs previously purified from the venom of the same genus. The NGF monomer molecular weight was estimated to be 13 500 by reducing SDS-PAGE and the isoelectric point was determined to be 7.2 by isoelectric focusing electrophoresis. NGF improved the epididymal sperm motility of male rats and increased the pregnancy rate and fetus number of mated female rats. The serum levels of luteinizing hormone (LH) and follicle stimulating hormone (FSH) of male rats administrated NGF + gossypol was lower than that of male rats administrated gossypol. Histological sections of testes and epididymides showed that NGF reduced the destructive effects of gossypol on rat testes. (C) 1999 Elsevier Science Inc. All rights reserved.
Resumo:
To obtain a more complete understanding of the evolutionary history of the leaf-eating monkeys we have examined the mitochondrial genome sequence of two African and six Asian colobines. Although taxonomists have proposed grouping the "odd-nosed" colobines
Resumo:
Evidence of incongruence between mitochondrial and nuclear gene trees is now becoming documented with increasing frequency. Among the Old World monkeys, this discordance has been well demonstrated in the Cercopithecinae, but has not yet been investigated
Resumo:
外实验表明，薯蓣提取物(DE)、三七皂甙(PNS)和灯盏素(EBF)3种物质中，除了DE与
EBF的伍用对复钙时间和Tr有明显的延长作用外(P
Resumo:
膜污染是限制膜生物反应器(MBR)应用和发展的瓶颈。为此,选择污泥浓度、膜通量(JV)、曝气量(Q气)、抽吸/停抽时间(tR/tS)、反应器升流区与降流区面积之比(Ar/Ad)进行正交试验,开展了MBR操作条件的优化研究。结果表明,溶解性胞外多聚物是导致膜污染形成和发展的主要物质,其中蛋白质/多糖值与膜压差上升速率存在线性关系;较佳的操作参数为:MLSS=7g/L,JV=10 L/(m2.h),Q气=6 m3/h,tR/tS=4 min/1 min,Ar/Ad=1.7。
