测算和加大电动振动台随机激振力方法的研究

在深入分析影响电动振动台随机激振力的诸因素及其测算理论的基础上，文章提出了通过实测电动振动台正弦态功率放大器最大输出电压，电流和振动台随机态阻抗，估算电动振动台随机激振力的方法，同时阐明了加大电动振动台随机激振力的技术途径，具有重要实际应用价值。     

实施振动试验的若干技术准备探讨

安全、正确地实施振动试验涉及到振动台能力、环境参数、试验夹具、试验方法等诸多方面。本文就试验参数的换算，振动台的选择、试验夹具的设计、试验系统的信号归一和匹配等技术准备对于确保试验达到预期效果的重要性进行了论述和分析。     

电动振动台台面加速度失真度的分析

通过对影响电动振动台失真度因素的定性分析，得出影响失真度的理论依据，提出降低电动振动台台面加速度失真度的措施，供设计电动振动台及使用电动振动台者参考。     

水下振动台关键技术的研究

本文从理论和实践两方面分析研究了水下振动台的若干关键技术问题,主要包括运动部件的设计、冷却系统的设计、密封系统的设计、压力平衡系统的设计等。解决了水下振动台设计所存在的难题。     

针对大型振动试验辅助支撑系统的结构设计与技术改进

对振动台辅助支撑系统进行了结构改进,增加了空气弹簧和导向轴。并且针对偏心问题,采用多个气源对不同位置分布的空气弹簧施加不同的气压进一步增强振动台的抗倾覆能力。建立了一套可以应用于轨道交通等大型设备的具有较大承载能力(14 t),较大抗倾覆能力的振动台辅助支撑系统。     

采用电动振动台实施冲击试验的若干问题探讨

采用电动振动台实施冲击试验是计算机引入试验控制在技术上的一次飞跃，它具有试验参数准确，易于控制，使振动台一机多用的特点，本文就电动振动台用于冲击试验的技术基础、试验软件、实施框图，试验对振动台设备参数的要求等作了详细的阐述和分析，对于指导该项技术的实施具有积极的意义。     

液压振动台第一个谐振频率的计算

本文给出了液压振动台第一个谐振频率的正确计算方法.否定了“国产液压油用在振动台系统中其体积弹性模量只能取6000～7000bar”的观点.     

低频振动试验装置精度指标的检测

叙述低频振动试验装置精度指标的检测系统以及主要精度和辅助精度指标的检测。 在环境振动试验、结构动力响感试验、低频传感器及测振仪标定等许多方面,经常使用各种低频激振设备,如机械式振动台、电液式振动台、低频电动式振动台及激振器等等。要使这类设备满足国内外有关试验标准的要求,要得到可靠一致的产品试验结果,就必须定期对于振动试验装置和精度指标进行检测,以使振动台有一定的精度保证。鉴于目前这方面的资料较少,所以本文仅根据实际工作中的一些经验和体会,对于工作频率范围低于200H_2的低频振动台精度指标的检测方法作一简要介绍,供有关人员参考和讨论。     

离心场环境下液压振动台试验设备的研制

本文主要介绍了离心机液压振动台系统的设计思想、构成和工作原理以及主要技术指标、特点和意义.     

改造电动式振动台是最经济的更新方式

以改造老型号Ｄ－３５０电动式振动台为具体例子，说明改造老式的电动振动台是一种最省钱的更新方式。     

底泥的氮、磷释放及其微生物影响的研究

氮和磷在自然界的循环已经引起了人们的关注,一方面因为氮和磷是生态系统中必不可少的营养元素,另一方面过剩的氮和磷会导致水域的富营养化 ,从而使生态平衡遭受破坏.本文综述了水体沉积物中氮和磷受微生物作用进行释放的影响,以及国内外的研究历史和现状.总结了氮磷微生物代谢的特点,并阐述了与传统认识相区别的最新发现和思想.本文试图从理论上说明微生物的氮磷释放机理,通过生物化学和分子动力的角度解释了细菌对氮磷的吸收和释放,即质子动势理论和Pho调控理论.目前,这一领域研究的热点是为了特殊的使用用途对于高效微生物的分离鉴别和组合培养,和对氮磷代谢的影响因素.     

DECISION-MAKING PROCESS ON THE DANUBE AND THE PLATTE1

ABSTRACT: Two case studies highlighting the institutional arrangements and decision-making processes used to attempt to allocate water on large scale river systems in two countries are presented. In both cases the implementation of river plans has been blocked by conflicts between those who wish to use water for irrigation, hydropower, or municipal purposes and those who wish to maintain instream flows for fish and wildlife. To date conflict has blocked the implementation of a large hydropower scheme on the Danube River, downstream from Vienna, Austria, and the construction of municipal and agricultural projects, as well as the relicensing of an existing hydropower facility on the Platte River in Nebraska. Analysis of the decision-making processes and institutional settings of both cases led to the identification of problem areas and development of recommendations that would support the achievement of compromise solutions for management.     

THE STATE PETROLEUM ENTERPRISE AND THE TRANSFER OF TECHNOLOGY

This article examines the potential of State Petroleum Enterprises in the developing countries for taking a lead in transfer of technology. After examining the reasons behind the growing demands for technology transfer, the paper defines the content of this technology and the means by which it can be transferred. In spite of reluctance on the part of the developed nations and the multinational oil companies to part with petroleum technology without an economic or political concession from the developing countries, much of this technology is either in the public domain or for sale by small speciality companies. The Enterprises can buy this technology and they can contract with specialty firms for operation with their countries. Of foremost importance is the education of nationals and development of indigenous group familiar with the scientific basis and specific techniques of petroleum technology.     

TEMPERATURE AND THE PRODUCTIVITY-LIGHT RELATIONSHIP1

ABSTRACT: Seventy-three in situ primary productivity experiments over a six-month period in hypereutrophic Onondaga Lake near Syracuse, New York, demonstrated variations in the light saturation parameter, I_p, which in part describes the interaction between productivity and light. Substantial variations in I_p were observed (coefficient of variation = 60 percent). Variations in I_p were significantly correlated (greater than 99 percent confidence level) with temperature (°C). An Arrhenius-type relationship (I_p= 1.312 × 1.088 (^T-20)) accounted for approximately 37 percent of the variation in I_p and may be appropriate for other systems dominated by green algae.     

RECREATION AND THE OHIO RIVER1

ABSTRACT: The use of the Ohio River for recreational purposes is increasing. While documentation of the real-time use of the river for recreation is sparse, inferences are made from the availability of mooring facilities. The location of the facilities, the economic advantages of Ohio River recreation, and the hazards to such recreation coincide at the four major urban centers. Future use plans for the Ohio River must consider recreation among the multiple uses of this river.     

WATER AND THE ENERGY CRISIS1

ABSTRACT: Water and energy are inextricably bound. Energy is consumed and sometimes produced by every form of water resources system. Opportunities for future development and production of energy resources abound as well as those for significant reductions in energy consumption through wise water development and management. Technological, political, social, economic and environmental factors interrelate in the energy-water mix. The role of the water resources planner will have to be expanded to include assessment of water-energy impacts in addition to traditional planning considerations. An energy conservation account may well have to be added to the dimensions of national economic development and environmental quality in water resources planning. Ways must be found to reduce amounts and rates of water used and energy consumed through new manufacturing processes, improved irrigation practices, better management, new or altered social-political-economic arrangements and other procedures. To do this will require setting priorities and making difficult management decisions. The water fraternity can play a major role in alleviating the energy crisis we now face.     

SiC工业生产中的环境问题及其防治对策

分析了ＳｉＣ材料工业生产中突出的环境问题及其产生过程和原因，总结了相应的防治对策，并结合当前研究提出了综合治理的新设想。