Full Aero-elastic Bridge Model Design of Long Span Arch Bridge

Aero-elastic model design is the precondition of full bridge aero-elastic model tunnel tests. The full aero-elastic bridge model design of long span arch bridge is discussed. The effect on the model design of different transverse rod space and bend stiff is analyzed in detail. Different scheme need to be designed according to the transverse rod stiff. Considering the changing section dimensional arches, the method of projecting the spatial arches to the plane arches, then designing the plane arches, at last projecting the plane arches to the spatial arches is proposed at first. The results show that the method is effective.     

地下滴灌灌水器出口正压试验研究

通过试验 ,研究了灌水器类型、流量、工作压力和土壤初始含水量对地下滴灌灌水器出口正压的影响规律。结果表明 :灌水器埋入土壤后 ,其出流由于受土壤等因素的限制 ,在灌水器出口处产生了一定的正压 ,该正压随着灌水历时的延长而增大。影响地埋灌水器出口正压的主要因素是灌水器的额定流量和土壤初始含水量     

铰链密封式传动滚子链的道路试验研究

通过30000km道路行驶试验研究表明，密封滚子链的磨损形式，对销轴和套筒而言是以疲劳磨损为主,伴随有粘着磨损与磨粒磨损；对链板和O形圈而言主要是疲劳磨损，并且O形圈的磨损要比链板的磨损严重得多。销轴和套筒表层磨损后产生了循环硬化特性，有利于提高其铰链副的耐磨性。     

Suitability of Multi-Agent Simulations to study irrigated system viability: application to case studies in the Senegal River Valley

It is assumed that Agent-Based Modeling is a useful technique for water management issues. In particular, it may provide a suitable framework for representing irrigated systems. The objective of this paper is to demonstrate its potential for a specific use: research on irrigated systems’ viability in the Senegal River Valley. The main assumption to be verified is that Multi-Agent Systems constitute a suitable architecture to study theoretically irrigated systems’ viability using simulations. By using Multi-Agent Systems, virtual irrigated systems can be designed that might then be used as virtual laboratories. These virtual labs constitute an alternative when real labs cannot exist for some reason.

In this paper we report on experiments we have conducted using such virtual labs for exploring an Agent-Based Model through the simulation of scenarios. A scenario is defined as a triplet: an environment, a set of individual rules, a set of collective rules. It is evaluated according to the longevity of the irrigated system. An index is defined, based on the ratio of long-enduring simulations among a set of repetitions of a given scenario. Even if simulation results display significant diversity for a given scenario due to random factors in the processes simulated, the ratio of long-enduring simulations is repeatable. This entails to explore the overall behavior of the virtual irrigated system and to build theories concerning the viability of Senegalese irrigated systems. An example is given showing the need for strong coherence for a given environment among individual rules and collective rules.     

基于Visual C++MSComm通讯控件的排种器实验台变频调速系统设计

介绍了排种器试验台变频调速系统的系统组成,以及实现计算机与变频器之间串行通讯的硬件构成及程序设计方法, 以此实现了计算机与变频器的串行通讯。利用本系统可以满足排种器实验台对计算机控制的速度实时调节的要求。     

1994-2009年我国检验医学论文的文献计量学研究

以中国知网CNKI数据库为数据源,通过关键词途径检索,获得1994-2009年我国公开发表的检验医学论文1 211篇。利用SPSS13.0统计软件对论文进行分析,内容包括文献的增长规律及主题内容分布。分析表明,我国检验医学论文的分布呈现指数曲线型增长趋势,其函数表达式为Y=32.657e^0.268x;我国检验医学研究主要集中在《微生物学及检验》课程的教学方法与管理研究等5个主要方面。     

Experiences derived from the Carabid Beetle Laboratory Test

The Carabid Beetle Laboratory Test using Poecilus cupreus (L.) was developed for the assessment of effects of pesticides on beneficial arthropods and is now available as an official guideline published by the BBA and the IOBC for the registration of pesticides. In this contribution some of the experiences in performing the test are summarized. In total, 126 compounds (mainly herbicides) were tested in 190 test runs (including water controls). In this acute laboratory test, the three parameters mortality, behaviour and feeding rate are investigated. Due to experiences with other ecotoxicological tests a one-way Analysis of Variance or ANOVA, followed by a Bonferroni Test, was used for the statistical evaluation of the feeding rates. The results presented here show that a statistical evaluation of the feeding data is possible and that this parameter is useful for the assessment of side-effects of chemicals for these predatory arthropods. In testing the reference substance pyrazophos (formulation: ‘Afugan’ 294 g litre⁻¹ EC) the mortality varied considerably. It is proposed that at a given value (30%) for effects on the mortality and the feeding rate, a test substance should be tested in a semi-field or field situation.