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Experimental and numerical analysis of an air cleaner's acoustic performance
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作者 冯慧华 赵志芳 +1 位作者 左正兴 鲁守卫 《Journal of Beijing Institute of Technology》 EI CAS 2011年第4期478-482,共5页
To improve acoustic performance of an air cleaner system,both experimental and theoretical studies were carried out.The air cleaner's acoustic numerical model was built by finite element methods(FEM).Acoustic param... To improve acoustic performance of an air cleaner system,both experimental and theoretical studies were carried out.The air cleaner's acoustic numerical model was built by finite element methods(FEM).Acoustic parameters of filter paper imported in the FEM model were calculated according to experiential formulas.Based on the models,the cleaner's acoustic character of transmission loss(TL) was computed.To verify the numerical results,TL results of the real air cleaner with or without filter paper were tested by four-microphone transferring function method.The experimental results show that the filter paper influence acoustic performance of the air cleaner significantly,especially in mid and high frequency band,and should be considered in numerical simulation.Comparisons between experimental and numerical results show that the numerical model is accurate enough to be used in multi-scheme acoustic optimization.Based on our study,TL results of two schemes were calculated and analyzed,which is useful to the air cleaner's final design decision. 展开更多
关键词 air cleaner acoustic transmission loss impendence tube filter paper finite element methods(FEM)
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Research on Development Status and Countermeasures of Agricultural Cleaner Production
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作者 LU Shuang-feng,YUAN Jian-ping,WANG Peng,WANG Jun-guang,WANG Rui-qiang College of Geography and Tourism,Hainan Normal University,Haikou 571158,China 《Meteorological and Environmental Research》 CAS 2011年第5期45-49,共5页
In the study,the connotation and objectives of agricultural cleaner production were introduced firstly,and then the development status of agricultural cleaner production in China was analyzed,and the problems existing... In the study,the connotation and objectives of agricultural cleaner production were introduced firstly,and then the development status of agricultural cleaner production in China was analyzed,and the problems existing in the development of agricultural cleaner production were pointed out.From the strategy of agricultural sustainable development,the necessity and feasibility of implementing agricultural cleaner production in China were discussed.Finally,some related countermeasures were put forward according to the problems existing in the development of agricultural cleaner production,so as to provide theoretical references for the realization of agricultural sustainable development in China. 展开更多
关键词 Agricultural cleaner production Development status COUNTERMEASURES Sustainable development China
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Wireless Charger Design of Robot Vacuum Cleaners with Power Repeaters for High Compatibility
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作者 Anglin Li Dariusz Kacprzak Aiguo Patrick Hu 《Journal of Electromagnetic Analysis and Applications》 2022年第5期47-64,共18页
Curved coils constructed by flexible printed circuit board (PCB) or hand-wound Litz-wire have been steadily becoming popular due to its applicable potential on devices that have a curved body. Inductive Power Transfer... Curved coils constructed by flexible printed circuit board (PCB) or hand-wound Litz-wire have been steadily becoming popular due to its applicable potential on devices that have a curved body. Inductive Power Transfer (IPT) systems based on curved coils and flexible ferrite sheets may provide more flexible charging solutions for various electronic devices such as rice cookers and robot vacuum cleaners. Power repeaters are also used in IPT systems to extend wireless charging range by guiding magnetic fields to the receiving coil. The interaction of these three topics could be inspiring. In this paper, two adjustable power repeaters are applied to an IPT charging system with various curved receiving coils designed for vacuum cleaners. Two power repeaters share the identical structure as the Tx coil and could be rotated to mirror symmetrically. The input and output power are calculated by analyzing the equivalent circuit model. The self-inductance, mutual inductance, and coupling coefficient of the proposed system are obtained via finite element method simulation with variable rotating angles. Three typical IPT designs have also been simulated in ANSYS Maxwell and compared with the proposed magnetic design. The comparison indicates the enhancing feature of the passive power repeaters on coupling performance and the ability to guide the magnetic flux for better magnetic field coupling. Furthermore, two types of co-simulations defined by the power source via Simplorer are conducted to explore how much power could be transferred. The tuned system is shown to be able to provide about 32 W under 100 kHz operating frequency for charging the battery of a robot vacuum cleaner. The results from theoretical calculation and simulation align well with each other. 展开更多
关键词 Passive Power Repeaters Inductive Power Transfer Curved Coil Robot Vacuum cleaners
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Vector cleaner:一种新的去除测序目的基因载体序列的方法 被引量:2
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作者 赵汀 周宝良 《南京农业大学学报》 CAS CSCD 北大核心 2014年第4期9-14,共6页
Sanger测序法测序目的基因常包含有目的基因和载体序列,为了快速去除测序目的基因载体序列,提出了一种新的目的基因载体序列去除方法并开发了程序Vector cleaner。首先利用该程序批量读取引物信息和目的基因测序序列;其次,程序在所读取... Sanger测序法测序目的基因常包含有目的基因和载体序列,为了快速去除测序目的基因载体序列,提出了一种新的目的基因载体序列去除方法并开发了程序Vector cleaner。首先利用该程序批量读取引物信息和目的基因测序序列;其次,程序在所读取的引物序列上建立引物半长的滑动窗口来产生种子,通过计数种子与测序序列的匹配次数,定位引物位置和删除引物两侧的载体序列;最后,程序通过比较上游引物序列和其反向互补序列分别与测序序列匹配种子数,判断和转换正义链。使用Vector cleaner对12条GhVIN1基因测序序列进行去载体测试,并与Seqclean和SeqMan软件相比较。结果表明:Vector cleaner能有效去除棉花GhVIN1基因测序载体序列,识别并翻译反义链序列。与Seqclean和SeqMan软件相比较,Vector cleaner正确率高,敏感性强。Vector cleaner、SeqMan和Seqclean所测试序列的总序列数正确率分别为100%、100%和91.6%,总碱基正确率分别为99.90%、99.00%和94.33%。与同类软件比较,Vector cleaner更适合实验人员批量去除测序目的基因载体序列,具有准确率高、敏感性强、自动翻译反义链的特点。 展开更多
关键词 目的基因测序序列 载体序列去除 VECTOR cleaner PERL语言
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Energy Giant Expands Gas Output to Meet Growing Demand for Cleaner Fuel
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《China Oil & Gas》 CAS 2016年第3期41-44,共4页
China National Petroleum Corporation(CNPC),Asia’s biggest oil and gas producer,will increase its investment in natural gas exploration and production,pipeline construction and gas sales in the coming decade,betting b... China National Petroleum Corporation(CNPC),Asia’s biggest oil and gas producer,will increase its investment in natural gas exploration and production,pipeline construction and gas sales in the coming decade,betting big on the country’s thirst for the clean fuel.The stateowned company,which currently allocates 70 展开更多
关键词 CNPC Energy Giant Expands Gas Output to Meet Growing Demand for cleaner Fuel LNG
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China Tries to Tap Cleaner Energy
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《China Oil & Gas》 CAS 2001年第2期47-,共1页
关键词 China Tries to Tap cleaner Energy
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Hard Fight Gives Rise to Cleaner Market—An Interview with Mr.Zhang Xinjian on the Rectification of China's Audiovisual Market
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作者 StaffReporterLiShengxian 《China & The World Cultural Exchange》 2002年第5期4-6,共3页
Reporter: Deputy Director-General Mr. Zhang, I heard that the Motion Picture Association of America (MPAA) recently presented a complementary wood board to the Ministry of Culture of China. Could you tell the inside s... Reporter: Deputy Director-General Mr. Zhang, I heard that the Motion Picture Association of America (MPAA) recently presented a complementary wood board to the Ministry of Culture of China. Could you tell the inside story about it to our readers?Zhang Xinjian: On May 30, a delegation from MPAA led by its vice president paid a visit to my ministry and I had a talk with them on behalf of the Department of Cultural Market. During 展开更多
关键词 In ZHANG Hard Fight Gives Rise to cleaner Market An Interview with Mr.Zhang Xinjian on the Rectification of China’s Audiovisual Market
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A cleaner two-step synthesis of high purity diallyldimethylammonium chloride monomers for flocculant preparation 被引量:12
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作者 TIAN Bing-hui FAN Bin +1 位作者 PENG Xian-jia LUAN Zhao-kun 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2005年第5期798-801,共4页
In order to improve the flocculation efficiency of polydiallyldimethylammonium chloride(PDADMAC), high molecular weight PDADMAC should be prepared from high purity diallyldimethylammonium chloride(DADMAC) monomers... In order to improve the flocculation efficiency of polydiallyldimethylammonium chloride(PDADMAC), high molecular weight PDADMAC should be prepared from high purity diallyldimethylammonium chloride(DADMAC) monomers. In this paper, a cleaner method with microwave irradiation and alkali solidification was proposed for preparing high pure DADMAC by selective heating under low temperature, and the prepared high purity DADMAC is characterized using FTIR and atomic absorption spectrometry. The new method provides a solution to the key technical problem of PDADMAC synthesis. Comparing with the conventional methods, the results showed that the advantages of the novel synthesis include: (a) high purity DADMAC is improved from 57% to 71% ; (b) reaction time of tertiary amine preparation is shortened from 6 h to 7 min; (c) water instead of acetone was used as reaction medium; (d) toxic by-products, wastewater and waste gas are eliminated. Flocculant made from the synthesized high purity DADMAC monomers was proved more efficient in flocculation tests. 展开更多
关键词 diallyldimethylammonium chloride microwave irradiation FLOCCULANT cleaner process
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Virtual design and performance prediction of a silencing air cleaner used in an I.C.engine intake system 被引量:4
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作者 郝志勇 贾维新 方芳 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第10期1107-1114,共8页
This paper reports results of the authors’ studies on the virtual design method used in the development of low noise intake system of I.C. engine. The resulting high pass-by noise at level above the legislative targe... This paper reports results of the authors’ studies on the virtual design method used in the development of low noise intake system of I.C. engine. The resulting high pass-by noise at level above the legislative target at full throttle when engine speed was around 5200 r/min necessitated a BEM-aided redesign task, following the typical process of design and development of an intake system. During the initial design, based on the acoustic theory and the requirements (1. The air flux of the redesigned should equal to or exceed the value of the original flux; 2. The filtering area must not be degraded), and considering the constraint of space in the engine compartment, total volume and rough internal dimensions were determined. During the detailed design, the exact internal dimensions of the air cleaner were determined, and an effective method was applied to improve the acoustic performance at low frequency. The predicted sound power of the intake system indicated that the objective of reducing the overall engine noise by minimizing intake system noise was achieved. 展开更多
关键词 虚拟设计 声学性能 噪音抑制 边界元素法
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Design of policy mechanism to promote cleaner production in China
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作者 ZHANG Tian zhu(Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China. 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2001年第3期346-350,共5页
In order to promote cleaner production in China, a package of policy options was presented based on the identification of the barriers encountered in the CP demonstration project and the effectiveness and feasibility ... In order to promote cleaner production in China, a package of policy options was presented based on the identification of the barriers encountered in the CP demonstration project and the effectiveness and feasibility of policy options for the CP implementation were analyzed. Furthermore, the policy mechanism framework was given, which composes of compulsory, economic incentive, social pressure and supportive function. Finally, the implementation strategy of the policy mechanism, in which the emphasis will be changed from compulsory policy options towards economic and social pressure policy options, was proposed. 展开更多
关键词 cleaner production barrier identification policy mechanism China
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From Less or No Waste Manufacturing and Cleaner Production to Recycle Economy -- A Review on the Theoretical Research and Practice of Ecological Enterprises in China 被引量:2
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作者 LiuYong 《Ecological Economy》 2005年第2期32-39,共8页
Based on systematical research on the conception evolution of ecological enterprise, theoretical and practical development of constructing ecological enterprise, the paper makes conclusion that ecological enterprises ... Based on systematical research on the conception evolution of ecological enterprise, theoretical and practical development of constructing ecological enterprise, the paper makes conclusion that ecological enterprises are developing into a new stage in which governments are launching some pilot projects about constructing ecological enterprises. And after that, governments should make policies to spread construction of ecological enterprises, to construct ecological enterprises in legal system and conforming to the standard as soon as possibly. 5o that, the basic units of ecological economy that fit to the conditions of China will be set up. 展开更多
关键词 中国 少废无废工艺 清洁生产 循环经济 生态效益企业理论 企业管理
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Level and potential of cleaner production in Baosteel's sintering process
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作者 ZHOU Maojun WANG Yuefei 《Baosteel Technical Research》 CAS 2010年第2期36-39,共4页
It is necessary for the sintering process to carry out cleaner production, which is also of great significance to the iron and steel enterprises of a long-flow process. According to the cleaner production standard rec... It is necessary for the sintering process to carry out cleaner production, which is also of great significance to the iron and steel enterprises of a long-flow process. According to the cleaner production standard recently issued by China' s Ministry of Environmental Protection, the research detailed in this study has analyzed and estimated the level of cleaner production at Baosteel in the aspects of technical equipment, resource and energy utilization, product quality, emissions, recycling and environmental management, etc. The research also expatiated some effective measures with which cleaner production can be carried out in Baosteel's sintering process, and discovered some potential opportunities of cleaner production. 展开更多
关键词 SINTER cleaner production total energy consumption DISCHARGE
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IJCCE: A Communication Platform for Cleaner Production and Sustainability
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作者 Jianjun Zhang 《International Journal of Clean Coal and Energy》 2013年第4期55-57,共3页
IJCCE: A Communication Platform for Cleaner Production and
关键词 cleaner PRODUCTION and SUSTAINABILITY
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Can environmental regulations achieve both profitability and profit quality?A natural experiment based on the China Cleaner Production Standards
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作者 Bowen Sun Hongyi Li Xuesong Li 《Chinese Journal of Population,Resources and Environment》 2021年第1期65-81,共17页
Numerous studies evaluated the effects of end-of-pipe control environmental regulations(EER).However,few scholars discussed the effects of process management environmental regulations(PER),such as the China Cleaner Pr... Numerous studies evaluated the effects of end-of-pipe control environmental regulations(EER).However,few scholars discussed the effects of process management environmental regulations(PER),such as the China Cleaner Production Standards(CCPS)implemented by the country's Ministry of Ecology and Environment.Using data on China's manufacturing enterprises,this paper adopts the CCPS policies as quasi-natural experiments and uses differences-in-differences(DID)methods to analyze their effects on enterprise profitability and profit quality,respectively.The results show that:first,the CCPS significantly improve both profitability and profit quality;that is,the implementation of the environmental regulation policy plays a significant role in improving enterprise profit rates and cash flows.Second,for the profitability mediator effects,the short-term Porter effect of CCPS is not significant but shows the opposite during the lag period and significantly reduces the management cost and wage levels,comprehensively promoting enterprise profitability.Third,for the profit quality meditator effects,environmental regulations improve the enterprises'cash flow by reducing management costs and increasing government subsidies;however,its effect on bank credit subsidies is not significant.Fourth,for the moderator effects,the environmental regulations'effect on enterprises profitability and profit quality depends on the strategic interaction among local governments,the scale and ownership of the enterprise,and regional differences.That is,the strategic interaction weakens the effect of environmental regulations on enterprise performance.Environmental regulations have a stronger influence on profitability and profit quality for large-scale,state-owned,and coastal enterprises. 展开更多
关键词 Environmental regulations cleaner Production Standards China Industrial Enterprises Database Differences-in-differences(DID)
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Study on the evaluation system for the cleaner production of the mine 被引量:1
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作者 Chen Jianhong Wang Bin 《Ecological Economy》 2007年第1期29-39,共11页
It is important to establish the evaluation system of the cleaner production of the mining enterprise, which canprovide the technical support and guidance for the cleaner production evaluation and facilitating the pro... It is important to establish the evaluation system of the cleaner production of the mining enterprise, which canprovide the technical support and guidance for the cleaner production evaluation and facilitating the promotion ofcleaner productive techniques so as to realize the integration of economic development and environmental protection.This paper, according to the characteristic of mining and Analytic Hierarchy Process (AHP), establishes the evaluationindex system, puts forward the overall quantitative evaluation method based on Fuzzy Mathematics and the experts’experience, and establishes the evaluation system of cleaner production. The main problems in cleaner production of themine are analyzed by calculation, and some countermeasures and suggestions are proposed. 展开更多
关键词 矿业企业 清洁生产 评价系统 模糊评估
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IMPLEMENTATION OF CLEANER PRODUCTION STRATEGIES TOWARDS A SUSTAINABLE CITY
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作者 CHENJie 《Chinese Geographical Science》 SCIE CSCD 2004年第3期227-238,共12页
Rapid urbanization and growing size of cities will have an increasing impact on the global environment in the 21st century. As an engine of urban development to drive economic growth and technological innovations, ind... Rapid urbanization and growing size of cities will have an increasing impact on the global environment in the 21st century. As an engine of urban development to drive economic growth and technological innovations, industry has moved its focus from controlling environmental hazards to stimulating sustainable industrial development throughout the entire product lifecycle. These process- and technology-driven innovations for industrial production are prerequisites for enhancement of urban environment and sustainable development of cities. In this review, problems of environment and resources scarcity associated with rapid urbanization are demonstrated. And, on the basis of expatiations on the concepts and policies of the cleaner production(CP) and other similar initiatives with the goal of preventing pollution at the source and of managing the raw material more efficiently, two different ways to link the practice of cleaner production in industrial sector with performance of urban environment are discussed in detail. Then, the introduction, practice and legislation of CP strategies in China are outlined, and possibility for China to develop CPC (Cleaner Practices for Cities) approaches in the demonstration cities is discussed. Finally, some suggestions on implementation of CPC strategies are put forward. 展开更多
关键词 城市化 城市环境 城市发展 清洁生产
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Zigzag Cleaner,我的变身法宝
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作者 海韵 《电子制作.电脑维护与应用》 2005年第7期49-49,共1页
大家以前可能用过很多隐藏窗口的软件,如Watchcat,HideHelper等,它们一般都是通过热键来完成隐藏的。不过这样一来,使用次数过多也会引起老板的怀疑哦。与其每次都迅速地按下一个快捷键,还不如直接在电脑屏幕上进行操作,只用鼠标... 大家以前可能用过很多隐藏窗口的软件,如Watchcat,HideHelper等,它们一般都是通过热键来完成隐藏的。不过这样一来,使用次数过多也会引起老板的怀疑哦。与其每次都迅速地按下一个快捷键,还不如直接在电脑屏幕上进行操作,只用鼠标划个简单的英文“Z”字,你所有打开的窗口全部隐藏或最小化呢?感觉如何呢?是否和变身的“佐罗”一样呢? 展开更多
关键词 ZIGZAG cleaner 下载软件 系统托盘 QQ
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傻瓜化的系统清理工具 Wise Disk Cleaner
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《电脑知识与技术(经验技巧)》 2011年第10期15-15,共1页
Wise Disk Cleaner是一款完全免费、非常傻瓜化的系统清理工具,该工具使用操作非常简单,可以帮助大家快速找出电脑内无用文件并将它们快速删除以释放更多空间,即便是菜鸟用户也可以通过该工具轻松胜任系统清理操作!安装完成后,选择... Wise Disk Cleaner是一款完全免费、非常傻瓜化的系统清理工具,该工具使用操作非常简单,可以帮助大家快速找出电脑内无用文件并将它们快速删除以释放更多空间,即便是菜鸟用户也可以通过该工具轻松胜任系统清理操作!安装完成后,选择立即启动Wise Disk CleanerFree,用户可以看到初始显示的主程序界面是英文显示。 展开更多
关键词 系统清理工具 cleaner WISE DISK 使用操作 程序界面 用户
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Ashampoo Registry Cleaner 1.0
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《网管员世界》 2011年第6期122-122,共1页
运行平台:Windows2000/XP/2003/Vista 软件授权:商业软件/注册表工具 软件大小:13600KB 下载地址:ed2k://|file|%5B%E6%B3%A8%E5%86%8C%E8%A1%A8%E6%B8%85%E6%B4%81%E5%B7%A5%55%85%B7%5D.Adlampoo.... 运行平台:Windows2000/XP/2003/Vista 软件授权:商业软件/注册表工具 软件大小:13600KB 下载地址:ed2k://|file|%5B%E6%B3%A8%E5%86%8C%E8%A1%A8%E6%B8%85%E6%B4%81%E5%B7%A5%55%85%B7%5D.Adlampoo.Registry. 展开更多
关键词 网络管理 计算机网络 电子邮件 注册表清理工具 AshampooRegistry cleaner1.0
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Research Progress for Kitchen Cleaner
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作者 Tai Xiumei Xu Bin +4 位作者 Wu Jiren Tang Zhuhua Cheng Yan Si Zuoxue Hou Meifang 《China Detergent & Cosmetics》 2017年第2期61-65,共5页
The formation of kitchen greasy dirt was expounded, and the different types of kitchen cleaner and common products were introduced. At last, the development trend for kitchen cleaner was prospected.
关键词 厨房油污 清洁剂 产品介绍 设计方案
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