小型柴油机的排放及控制技术

柴油机排放控制的重点是氮氧化物(NOx)和颗粒物(PM)两种污染物,控制技术措施主要分为机内净化和机外净化方法。以385T型柴油机为例,重点讨论了小型柴油机通过燃烧、喷油、配气系统和机体结构参数优化设计等机内净化技术,可满足国二或国三以上排放标准。随着国四排放法规的逐步实施,必须结合排气后处理技术,可采取的技术路线有"优化燃烧+选择性催化还原(SCR)"和"EGR+柴油颗粒过滤器(DPF)"控制方法。     

车辆排放污染的综合控制

随着我国汽车保有量急剧的增加，车辆排放污染已成为亟待解决的重要课题，控制排放污染是一个大型的系统工程，本从车辆、道路交通环境、交通管理三个方面论述了对排放污染的综合控制。     

摩托车尾气排放与降低排放措施的探讨

本述了摩托车由于大多采用二冲程和在城市保有量的迅速增加，已成为危害城市环境质量的主要污染源之一，分析了我国摩托车排放标准的特点并与国外标准进行了对比，探讨了现阶段降低擅有害气体排放的可行对策，提出了采用催化转化技术的“净化消声器”是新生产车或在用车排放达标的优选装置。     

车辆使用特性与排放特性的关系研究

除行驶里程外,其他一些因素也会导致在用车辆排放特性变差.本文分析了影响车辆排放特性的因素并采取必要措施对其进行控制.对注册日期相近但使用工况不同的在用车,利用实验获取排放特性的有关数据,并利用数理统计及灰色系统理论进行分析研究.结果显示,在各影响因素中,行驶里程、维护保养、驾驶习惯等是排放特性的重要影响因素,而且长期不使用或一般在市内行驶的在用车也会导致其排放特性变差.该研究为正确使用车辆,使在用车的排放特性在使用周期内始终保持其应有的水平,减少排放污染提供了实验和理论依据.     

对从源头防止和控制污染排放问题的调研与思考

在当前城市的快速发展中,各种污染也随之出现,而污水和生活垃圾尤为突出。文章对南昌市当前工业和城镇生活污水排放、生活垃圾处理状况进行了调研分析,对相关生活污水、垃圾处理政策和对防止和控制污染排放进行一些分析与建议。     

味精生产的污染排放分析与治理研究

以沈阳某味精生产厂为例，对味精生产从水体、大气进行了污染分析。研究结果表明，味精生产中污染排放能够达到国家的相关标准。     

《茂名市工业污染物排放标准》修订探讨

茂名市工业污染物地方排放标准是1981年底完成的,在防治污染和改善城市环境质量上起了重要的作用。随着工业的迅速增长,地方排放标准的不足之处也显现出来,特别是没有包括炼油厂的重要污染物,因此,严格标准控制污染是必要的。文中提出了地方排放标准修订的内容和方法。     

对中学化学实验室污染减排措施的探究

一说起污染,人们首先想到的就是各种化工厂如印染厂、水泥厂、酸化工厂排放的废弃物,汽车排放的尾气等等,却忽略了学校的化学实验室这么一个污染场所,随着教育的不断发展及新课程改革的全面实施,中学活动与探究实验在不断地增多,实验后产生的污染物的量也在增加,虽然中学化学实验室每次排放污染物的量并不多,相对于工业排污量来说还是很小,但日积月累,对师生身心健康的影响是不容忽视的,给环境造成的负担也是不容忽视的,所以对于实验室污染采取措施已是刻不容缓。     

中国经济发展与环境污染关系的实证研究

本文首先运用对中国工业部门污染排放总量与排放强度的测定，把工业部门分为重污染行业、中等污染行业和轻污染行业，以期对经济可持续发展和产业结构调整提供参考。接着，本文根据环境库兹涅茨曲线理论，对中国工业三废排放与经济发展的关系进行实证研究。     

北京市实验室VOCs排放水平及控制对策

为掌握和了解北京市实验室VOCs排放状况,对不同类型、典型的实验室进行现场取样调研和问卷调查,获取实验室有机溶剂使用情况和规律;基于物料衡算法初步确定不同类型实验室VOCs排放因子;开展了实验室VOCs排放现场监测,初步识别了实验室VOCs排放水平。基于当前实验室有机废气的产生环节和状况,有针对性地提出VOCs污染控制技术对策,为环境主管部门制定相关控制对策提供参考和支撑。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.