ELECTRICAL CONTROL SYSTEM ANALYSIS FOR THE MECHANICAL TRANSMISSING TEST BED

This paper analyzes and proves the seeking for projects of the test bed, the equivalent processing for the bi-electric machine set and the control and loading modts of the test bed. It also introduces briefly the features of the block diagram of the control system and gi.ves the test waveforms. Finely, it points out the problems to be further studied.     

Fast Animation Display of Large Structure with Multistep Modes

The method that the MASM assembler is interlaced to the MS-FORTRAM 5. 0 is used to store some step structural mode drawings in the designated disk file through their visiting VRAM,which are then restored in it when needed in order to realize the quick animation display of the mode. This method solves the problem of insufficient memories in storing multistep structural mode drowings with the ordinary method. As a functional modular of finite element analysis programs SAPS and ADINA transplanted to a microcomputer,the modular programed with the above method can quickly display the animation of large structure with multistep modes.     

“植物生长过程”教学模式实例探究

通过实例,创新性提出以"植物生长过程"的教学模式为主的"6个0.5"的校企合作模式,并就实施的目标、主要项目及其创新点与不足展开阐述。通过研究表明,要发挥新型的校企合作模式的作用,需要政府、企业及学校的"三元"合作。     

安吉县毛竹现代园区生产经营状况调查与分析

采用参与式农户评估方法(PRA)对安吉县毛竹现代园区进行调查,分析了农户生产经营方式的变迁。结果表明,当前农户收入方式正发生结构性变迁,传统的以经营竹林为主要收入来源的生产方式已逐渐向工资性和多种林业经营生产方式转变,农户兼业特征明显,农村劳动力明显不足;随着林权制度的改革与市场经济的发展,有效配置林地资源,实现林农生产经营的规模化、商品化和科技化,建设林业专业合作组织,提高林农自身组织化程度,是当前农户生产经营方式的主要发展趋势。     

大学生信息素养教育方式及方法探析

介绍了信息素养教育的内涵,探索性地总结提出了信息素养教育方式及方法。     

基于C/S架构的教学档案管理系统研究

随着教育改革的不断深入和发展,高校电子教学档案在教学管理工作中的作用和价值正日益显现出来。探索运用C/S模式研究教学档案管理系统,具有数据操纵能力强、处理数据量大的特点,可以确保数据的安全性。     

Rationale for a natural products approach to herbicide discovery

Weeds continue to evolve resistance to all the known modes of herbicidal action, but no herbicide with a new target site has been commercialized in nearly 20 years. The so-called 'new chemistries' are simply molecules belonging to new chemical classes that have the same mechanisms of action as older herbicides (e.g. the protoporphyrinogen-oxidase-inhibiting pyrimidinedione saflufenacil or the very-long-chain fatty acid elongase targeting sulfonylisoxazoline herbicide pyroxasulfone). Therefore, the number of tools to manage weeds, and in particular those that can control herbicide-resistant weeds, is diminishing rapidly. There is an imminent need for truly innovative classes of herbicides that explore chemical spaces and interact with target sites not previously exploited by older active ingredients. This review proposes a rationale for a natural-products-centered approach to herbicide discovery that capitalizes on the structural diversity and ingenuity afforded by these biologically active compounds. The natural process of extended-throughput screening (high number of compounds tested on many potential target sites over long periods of times) that has shaped the evolution of natural products tends to generate molecules tailored to interact with specific target sites. As this review shows, there is generally little overlap between the mode of action of natural and synthetic phytotoxins, and more emphasis should be placed on applying methods that have proved beneficial to the pharmaceutical industry to solve problems in the agrochemical industry.     

Why have no new herbicide modes of action appeared in recent years?

Herbicides with new modes of action are badly needed to manage the evolution of resistance of weeds to existing herbicides. Yet no major new mode of action has been introduced to the market place for about 20 years. There are probably several reasons for this. New potential products may have remained dormant owing to concerns that glyphosate-resistant (GR) crops have reduced the market for a new herbicide. The capture of a large fraction of the herbicide market by glyphosate with GR crops led to significantly diminished herbicide discovery efforts. Some of the reduced herbicide discovery research was also due to company consolidations and the availability of more generic herbicides. Another problem might be that the best herbicide molecular target sites may have already been discovered. However, target sites that are not utilized, for which there are inhibitors that are highly effective at killing plants, suggests that this is not true. Results of modern methods of target site discovery (e.g. gene knockout methods) are mostly not public, but there is no evidence of good herbicides with new target sites coming from these approaches. In summary, there are several reasons for a long dry period for new herbicide target sites; however, the relative magnitude of each is unclear. The economic stimulus to the herbicide industry caused by the evolution of herbicide-resistant weeds, especially GR weeds, may result in one or more new modes of action becoming available in the not too distant future.     

园林专业设计类课程交互式自主学习模式探讨——以园林茶室建筑设计课程教学为例

针对园林专业设计类课程的特点,以园林茶室建筑设计为例,通过交互式自主学习模式的运用,取得了较为明显的效果,主要表现在:激发了学生的学习兴趣,促进了学生综合能力的提高;激发学生的创作灵感,提高了学生设计能力;增加了学生的专业知识储备,促进了学习资源的共享等。     

贵州江口县生态农业体系的构建

以生物与环境协同进化原理、整体性原理、限制因子原理、食物链原理、生态位原理、效率协调统一原理为指导,应用生态学、生态经济学和循环经济学系统工程方法,对全球"人与生物圈"保护区梵净山山麓下的贵州省江口县生态农业体系提出若干构建模式,确立江口县生态农业未来发展的前沿理论。