船用往复泵管路减振技术研究

船舶往复式水泵管路振动一直是国内有待解决的难题，本文在分析往复式舱底泵管路振动产生机理的基础上，针对往复式水泵管路振动特性，运用近年来研制的一些新型管路减振元件，如袖套式挠性接管、管路消振器、管路流体压力蓄能器等，对往复式水泵管路振动进行试验研究，为管路减振设计提供了有意义的参考依据。     

PERFORMANCE ANALYSIS OF SECOND-ORDER STATISTICS FOR CYCLOSTATIONARY SIGNALS

Introduction　　 In natural and man- made signals,there existwidely a special kind of non- stationary signal,forwhich the statistics,correlation function or higher-order statistics,vary not only with time but alsowith multiple incommensurate periods ( periodicallyor polyperiodically) .The random signal,such ascommunication,radar,telemetry,sonar,etc andthe data thatsubjectto seasonal and rhythmic vari-ations,such as hydrologic,oceanic,climatic,ex-hibit periodically the time- varying characteris…     

工务调度信息管理系统的探讨

通过对上海铁路局阜阳工务段调度工作职责范围、日常工作、工作流程的调查分析,提出了铁路工务调度管理工作中需要解决的问题,针对存在问题,对建立工务调度信息管理系统进行探讨.……     

多功能水净化器的研制

随着人民生活水平的不断提高,居民对家庭用水的水质量要求也在不断的提高,但是由于多种原因,我国自来水网提供的水质还达不到直接饮用的水平,水中杂质多,另外由二次污染引起的细菌和微生物比较多,因而对人的健康损害很大,所以人们喝的水要经过再次的杀菌和过滤才能被饮用。另外,蔬菜瓜果上存在的农药残留物对人体健康的危害也缺乏方便有效的去除方法。为了解决以上难题,本研究组作了深入探讨,获得了较为理想的结果,且以此原理设计了适合进入家庭使用的多功能净水器。该仪器能同时满足人们的饮用水和洗涤用水的需要,其中用于洗涤的水可以用来杀灭被洗物上的细菌和病毒,还可以分解蔬菜瓜果上存在的农药残留,也可以呵护人的皮肤。     

数值波浪水槽在半圆堤波浪力计算中的应用

以N-S方程为控制方程,以k-ε模型为紊动封闭模型,采用VOF方法重构自由表面,建立了垂向二维数值波浪水槽。模拟了规则波与半圆堤的作用过程,结果表明,单点数模波压力过程与物模实测结果符合良好。研究中发现,数模计算中若堤后计算区域设置过短,堤上越浪可以引起堤后水量累积和水位上升现象,从而造成堤身背浪面压强总体增大,由此算得的防波堤总水平波浪力最大值偏小16%~20%。提出了将堤后计算区域延长到4~5倍波长的办法,计算结果表明,堤身背浪面压强上升及堤身总水平力下降现象基本消失。     

Growth of urban transportation: Peoples republic of China

The Peoples Republic of China, with its great urban populations, is finding it necessary to develop a range of strategies to deal with increasing demand for goods and people movement, increasing motorization and the increasing congestion that results from the increasing travel demand. This paper discusses strategies being adopted in two northern cities, Changchun and Shenyang. Both transit and roadway programs are examined for Changchun. Problems and successes of a new toll road are examined for Shenyang. Sustained infrastructure investment is essential to assure the necessary mobility for economic growth.     

江淮气旋大风预报研究

江淮气旋大风预报研究的结果表明：气旋大风的预报实际上就是冷空气南下造成地面加压与气旋东移造成地面降压，这两个因素所造成气压梯度发展变化地以预报。还介绍用天气学原理建立的大风预报模式，以及用数理统计方法判别有无强风的预报，经过历史拟合和试报，在预报气旋大风中有一定的准确性。     

Transit assignment under crowded conditions

This paper presents a transit assignment algorithm for crowded networks. Both congestion in vehicles and queuing at stations are explicitly taken into account in predicting passenger flows for a fixed pattern of origin-destination trip demands. The overflow effects due to insufficient capacity of transit lines are considered to be concentrated at transit stations, while the in-vehicle congestion effects (or discomforts) are considered to be dependent on in-vehicle passenger volume. Overflow delay at a transit station is dependent on the number of excess passengers required to wait for the next transit car. We use a logit model to determine the split between passengers that chose to wait for the next transit car and passengers that chose to board on the alternative transit lines. The proposed algorithm predicts how passenger will choose their optimal routes under both queuing and crowded conditions.     

烟大火车渡船方案设计两种推进装置的比较

烟大线火车渡船可以采用常规柴油机推进或柴油机电力推进。通过对两种推进方式在可靠性、冗余性、机动性、先进性以及经济性方面进行分析与比较后，选用第三代，即吊舱式柴油机电力推进装置。它的设计和建造是我院、我国造船史上一件大事。     

船舶力控减摇鳍系统建模与仿真

针对海浪的随机干扰、船舶模型的不确定性和控制器输出约束，采用升力反馈控制的全新方法，建立系统数学模型，运用H∞控制理论考虑混合灵敏度S／KS问题设计了控制器，对混合灵敏度S／KS问题模型、权函数的选择等问题进行了研究，同时结合具有实船，利用MFC和OpenGL三维图形库，建立了在微机上实现交互式实时控制、同时显示直观的实时多媒体动画的力控减摇鳍仿真系统，给出了仿真结果，并对仿真结果进行了分析