植物开花光周期反应的分子调控机制

植物开花时间受到日照长短季节性变化的调节,拟南芥和水稻中与光周期反应相关基因的分离,使人们得以认识植物开花光周期反应的分子调控机制。植物感知日照长短的变化主要由CONSTANS(CO)基因的表达所控制。CO能够将光信号与生物钟信号整合,调节开花基因FLOWERING LOCUS T(FT)的表达,并最终控制植物的开花时间。本文对这一研究的最新进展进行了综述。     

Advances in Pharmacological Studies of Coptis Chinesis

A Coptis Chinesis is the dry rhizoma of ranunculaceous Coptis Chinesis Franch or Coptis deltoidea C. 7. Cheng et Hisao, or Coptis teeta Wall. It is the traditional Chinese herb, which is used in the contagious diseases. In recent years, its new pharmacological actions have been reported, which are antitumour, hypoglycemic response, immunoloregulation, improving the functions of cardiovascular. The important pharmacological functions of Coptis Chinesis are hypoglycemic response, improving the functions of cardiovascular, antitumour. With the deeply researching of Coptis Chinesis pharmacology, and the continuous founding of pharmacological mechanism, new preparation will be widely applied in the clinic.     

Model of Survivable Architecture

Critical information system in Interact is in face of increasingly security problems. More attention has been focused on the survivability of information system, which is the capability of system to continue its mission even in the presence of damage to the system. The authors first introduce the definition of survivability. According to four function properties of survivability, which are Resistance, Recognition, Recovery, and Adaption, the authors design a model of survivable system structure and then explain survivability requirement, survivability strategy in this model. Additionally, they provide possible technical solutions for the survivability of systems, categorized by different aspects of our survivability strategy.     

Suitability of Bi-linear Restoring Force Model in Earthquake Response Analysis

Based on the data of dynamic tests of small single-storey steel frames,the suitability of simplified hi-linear restoring force model in earthquake response analysis is discussed, and the Maximum displacement response MD, the sum of squares of the displacements in the whole vibrating history SSD, and the total dissipated energy EI are considered respectively as equivalent object.     

On Determinative Parameters of SDOF Systems in Elasto- plastic Earthquake Response

Parameters dominating elasto- plastic earthquake response of SDOF systems,relation between ground motion amplitude and elasto- plastic response of SDOF systems are presented in this paper.     

Application of Engineering WorkStation in Analysis of Truck Crashworthiness

This paper presents the basic equations and algorithm of vehicle crashworthinessbriefly.Take a light-truck for example,some applied problems in ustng Engineering WorkStationto analysis truck crashworthiness are discussed.A installation method of contact surface is intro-duced,Finally,a nurnerical simulation result is presented.     

Seismic Behavior of Asymmetric Building under Pushover Analysis

Pushover analysis is a tool to study the inelastic behavior of structures under strong seismic action. The 3D-pushover analysis was performed to analyze the inelastic lateral-torsional coupled response of multistory asymmetric structures. The symmetric frame and frame-wall systems were studied in this paper, and the capability curve of the top displacement and base shear,the story drift and the position of rotation center were compared with reference to corresponding symmetric structures. The characters of inelastic response of multistory asymmetric structures were found. The conclusion provides reference for performance-based seismic design of asymmetric structures.     

小麦花培材料的筛选和利用

花培育种是一条快速有效的育种途径，采用两种培养基对20个小麦组合材料进行花培分析，结果表明：小麦花培愈伤组织诱导培养基K优于C17，绿苗产率是C17的3.5倍多。不同基因型材料花药培养差异较大，筛选出一批不同类型的高培养力基因型材料，为有目的组配杂交组合提供依据，提高花培育种效率。     

摆动活齿传动系统扭转振动分析

建立了摆动活齿传动系统的扭转振动动力学模型，导出了该扭振系统的振动方程。系统动力学模型考虑了活齿传动双排结构中激波器、活齿、活齿架的转动惯量、时变啮合刚度、误差、阻尼等，因此，所建立的微分方程式是多自由度时变方程组，对此，采用四阶Runge-Kutta法对系统动态响应进行了求解。     

含间隙内燃机曲柄滑声机构动力学研究

考虑到含间隙运动副副元素的碰撞接触时的边界条件，采用非线性弹簧力和非线性阻尼描述副无素的碰撞接触过程，以此为基础建立了含间隙内燃机曲柄滑块机构的动力学模型；通过数值仿真研究了运动副间隙对机构动态特性的影响，并指出在机构高运转条件下，运动副元素存在连续变形接触现象。