水资源对我国工业发展的影响及对策建议

党的十六大提出了全面建设小康社会的奋斗目标,十六届三中全会又强调指出,要树立全面、协调、可持续的发展观,促进经济社会和人的全面发展.树立和贯彻科学的发展观,很重要的一个方面,就是要坚持人与自然的和谐,正确处理发展与资源、环境的关系.水是人类的生命线,因此,水不仅是重要的自然资源,而且是战略资源.     

因你，改变生活《移动信息》精品2010：因创新，改变生活2010年风云产品纵横评 战力全开2010年最强Aandroid旗舰大小拼

在过去的2010年里,你的生活发生了哪些变化？我们大家共同身处的通讯,数码行业又发生了哪些变化？时代不断前进,科技日新月益,每一天这个世界都在发生着或澎湃,或沉默的变化。因为创新,思考以及梦想,一切都在变得越来越美好,而你,正是这一切改变的源动力,有你,世不同,因你,改变生活。     

影响水价调整效果的经济分析

北京是水资源严重匮乏的城市,人均占有水资源量不足300m3,是国内人均的八分之一,世界人均的三十分之一.同时随着城市建设的发展,用水需求快速增长,加剧了供需矛盾.为缓解水资源紧张状况,用经济手段进行调控是抑制用水量增长的有效手段之一,其核心就是调整水价.而水资源作为商品,在市场经济的环境下,水价调整的效果究竟如何,在很大程度上取决于水资源的经济特性.本文试图以北京市水价体系为背景,对影响水价调整效果的经济因素进行初步的分析.     

节能环保厨具打造绿色品质生活——北京市警盾京西厨房设备有限公司

过去,人们一提起厨房,就会联想到弥漫的油烟,四溅的火星,满地的污水,和闷热的感觉,随着生活质量的不断提高,人们对健康、环保、节能的要求也越来越高.     

变频调速技术在注水系统的应用

油田注水系统中能耗费用占成本的50%～70%,水泵的能耗费用占总能耗费的90%以上.实际运行中,低压泵的效率大多数不足60%,高压泵的效率大多为80%,站的综合效率不足50%,存在着较大的能源浪费.应用变频调速技术,可以实现对注水系统泵类设备的电机转速调节,可实现稳压、稳流注水.同时安装软启动器,利用软启动器代替Y-△转换,设定合理的启动加速过程可使电机平稳加速启动,消除对电网的冲击和对设备的冲击,且不会造成压力、流量、流速的剧烈变化,对防止水击、喘振有利,可以有效延长管网、泵、阀的维修周期和寿命,提高变压器的启动能力.     

铝冶炼烟气净化余热利用技术的探讨

近十几年来,我国的铝冶炼工业迅速发展,为国民经济的增长做出了重要贡献.但在冶炼铝生产过程中,会产生大量有害烟气,这种气体严重危害人类的健康,破坏生态环境.由于受经济利益的驱动,环保领域和扩大产量方面的研究工作成果较多,降低能耗方面的研究尚待深入进行.以铝冶炼烟气净化余热利用技术为研究内容,通过建立烟气净化余热利用系统,解决铝冶炼生产过程中的能源利用问题,从而实现能源再生的目的.     

真空除氧冷凝系统技术改进

真空除氧冷凝系统原采用混合式冷凝器,给系统运行带来许多问题,重新设计计算后,系统改用表面式换热器,不但完全达到了原要求的工艺指标,而且,停用了新鲜水,回收了蒸汽的余热,改善了工人的劳动条件,取得了较好的经济效益和社会效益.     

谁玩好了,谁就成功了 游戏人间贾乃亮

iPhone 4不仅是一件时尚的饰品,用于衬托你的品味,你的格调,以及你的自我。更是以最顶尖的科技,诠释了自己,诠释了,何谓轻薄。     

复杂小断块油田烃类气体污染防治分析

复杂小断块油田,地质情况复杂,断层非常发育,区块多,断层多,含油面积相对较小,单元储量少,构造和油气分布却十分复杂;产能20万t/a以上规模的油田区块仅占少数,且这些油田也是由多层系组成,开发难度较大;经济效益较低,百万吨产能投资高;地面工程节能降耗环保的工艺、流程和设备开发较少,新技术研发投入较少,引进新工艺、新设备的能力较弱,对于伴生气的回收利用能力较弱,大量零散伴生气只能放空,给环境带来了污染,同时浪费了资源.江苏油田是典型的复杂小断块油田,下面我将结合江苏油田的实际情况,对复杂小断块油田烃类气体污染及防治措施进行初步分析.     

终点!中点?

<正>终点和中点,这两个词语仅仅相差一个字,而且不同的字其发音又相同,但两个词语表达的意思却完全不同。学生时代,几乎所有人都喜欢期终,而不喜欢期中,尽管期终必须经历一场大考,但仍不能改变我们的态度,因为前者连接着一个长长的无忧无虑的快乐的假期,而后者预示着我们又将开启一段新的艰苦的学习历程。仅仅还有两周时间,在关心全球应对气候变化的人们的眼里是短暂的,     

自然通风技术研究方法及工具

目前自然通风主要有三种研究方法:简单的理论分析法、实验法和数值模拟法。本文概括介绍了后两种方法的研究现状,并对它们进行了分析比较,提出各种方法的适用场合。在数值模拟法中还介绍了几种可用于分析自然通风系统的通风特性和热特性的常用工具软件,对各自工作原理和应用特点进行了比较,并对使用方法和应用场合提出了建议。     

Study of contact melting inside isothermally heated vertical cylindrical capsules

Close-contact melting processes of phase change material (PCM) inside vertical cylindrical capsule are studied. PCM are heated by the capsule isothermally at the bottom and side. The theoretical formulas of the melting rate and thickness of liquid layer during the heat transfer process are obtained by analysis, which are convenient for engineering predictions. Finally, the factors that affect melting are discussed, and conclusions are drawn.     

Potential method in the theory of thermoviscoelastic mixtures

In this article, the linear theory of binary thermoviscoelastic mixtures is considered and the basic boundary value problems (BVPs) of steady vibrations are investigated. Namely, the fundamental solution of the system of equations of steady vibrations is constructed explicitly and its basic properties are established. Green’s second and third identities are obtained and the uniqueness theorems for classical solutions of the internal and external basic BVPs of steady vibrations are proved. The surface and volume potentials are constructed and their basic properties are given. The determinants of symbolic matrices are calculated explicitly. The BVPs are reduced to the always solvable singular integral equations for which Fredholm’s theorems are valid. Finally, the existence theorems for classical solutions of the internal and external BVPs of steady vibrations are proved by the potential method and the theory of singular integral equations.     

质子交换膜燃料电池系统控制与应用现状

描述了质子交换膜燃料电池(PEMFC)系统的控制及其在中低功率领域中的应用现状。首先概述了过程模型和电压预测模型，对影响电堆性能的各参数进行分析。其次，从目前运用的简单控制方法、混合动力驱动、效率优化、故障容许等方面对PEMFC系统的分析与控制结构作了说明。然后介绍了PEMFC的几种具体应用。最后结合国内外的相关研究进展，提出了一些有待进一步研究的方向。     

US nuclear energy policy Provision of funds for decommissioning

The five recognized methods of decommissioning nuclear power plants are reviewed, and are linked with US nuclear regulatory policy. Although over 60 US nuclear reactors have been decommissioned since 1960, none have been large-scale commercial facilities. Costs of the decommissioning alternatives are estimated, but are acknowledged to be highly tentative and uncertain. Five methods of providing funds for decommissioning and the actual practices of US electric utilities are analysed in terms of the policy issues they present. Revenue bonding and sinking fund approaches are argued to be the soundest means to recover decomissioning uncertainties surrounding decommissioning are considered.     

无心感应熔铜、铝炉用耐火材料

介绍了熔炼铜、铝及其各自合金的无心感应炉用新型干式成型耐火材料的研制、性能和使用情况。该材料成本低,成型工艺简便,使用寿命长。     

二甲醚在能源行业应用前景综述

介绍了二甲醚（DME）的特点，结合我国能源结构的实际情况，详细论述了其在能源行业的应用前景，特别是替代民用LPG燃料和车用柴油燃料的应用前景，分析了基于DME为燃料相关系统的关键技术、应用前景及主要障碍。通过与柴油、LPG、天然气的物性对比，就二甲醚的推广所要解决的技术问题进行了分析，提出相关解决方案，并对二甲醚在燃料市场的应用方向进行了阐述。     

锅炉烟气脱硫技术进展

简要介绍了烟气脱硫技术的分类，以及几种主要的湿法、干法、半干法烟气脱硫技术的主要特点。对不同的烟气脱硫技术的优缺点也作了简单评述。同时概述了目前国内外烟气脱硫技术应用和开发进展情况，对我国烟气脱硫技术的发展提出了建议．     

Thermal buckling of temperature-dependent composite super elliptical plates reinforced with carbon nanotubes

In this work, the problem of thermal buckling of composite plates reinforced with carbon nanotubes (CNTs) is investigated. Distribution of CNTs as reinforcements through the thickness direction of the plate is assumed to be either uniform or functionally graded (FG). Properties of the reinforcement and matrix are both temperature dependent. Properties of the composite media are obtained according to a refined rule of mixture approach where the e?ciency parameters are introduced. The plate is in a super elliptical shape where the simple elliptical shape and rectangular shapes are obtained as especial cases. In these types of plates due to the round corners, stress concentration phenomenon is eliminated. Based on the Ritz method where the shape functions are of the polynomial type, the governing equations are obtained. These equations are solved using an iterative eigenvalue problem since the properties are temperature dependent. Numerical results are validated for the simple case of an isotropic plate. Novel numerical results are provided for plates reinforced with CNTs in different shapes, various volume fractions and different patterns of CNT distribution. It is shown that FG-X pattern of CNTs in matrix results in the maximum critical buckling temperature.     

Stochastic approach for daily solar radiation modeling

Mathematical modeling of solar radiation continues to be an important issue in renewable energy applications. In general, existing models are mostly empirical and data dependent. In this paper, a novel approach for solar radiation modeling is proposed and illustrated. The proposed application consists of hidden Markov processes, which are widely used in various signal processing topics including speech modeling with successful results. In the experimental work, mean of hourly measured ambient temperature values are considered as observations of the model, whereas mean of hourly solar radiation values are considered as the hidden events, which constitute the outcomes of the proposed mathematical model. Both solar radiations and temperatures are converted to quantized number of states. Finally, after a training stage that forms the transition probability values of the described states, the hidden Markov model parameters are obtained and tested. The tests are repeated for various numbers of states and observations are presented. Plausible modeling results with distinct properties in terms of accuracy are achieved.