检索结果-南通市图书馆

Biogas reco.ery from microwave heated sludge by anaerobic digestion

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(Technological sciences) 2010年第1期53卷 144-149页

作者： QIAO Wei1,WANG Wei2,ZHU CuiPing3 & ZHANG ZhongZhi1 1 co.lege of Chemical science and Engineering,china University of Petroleum,Beijing 102249,china 2 department of Environmental science and Engineering,Tsinghua University,Beijing 10084,china 3 J & K china Cleaning Energy technology co.ltd.,Beijing 100085,china 1. co.lege of Chemical science and Engineering China University of Petroleum Beijing 102249 China2. Department of Environmental Science and Engineering Tsinghua University Beijing 10084 China3. J & K China Cleaning Energy Technology Co. Ltd. Beijing 100085 China

Biogas generated from sewage sludge,livestock waste,and food waste by anaerobic digestion is a valuable renewable energy ***,co.ventional anaerobic digestion is not an efficient process.A long hydraulic retention time and low biogas reco.ery rate hinder the applications of those *** effective pretreatment method to destroy sludge microbial cells has been one of the major co.cerns regarding improvement of the biogas *** article focuses on the effects of microwave heating on sludge anaerobic *** suspended solid(VSS) and chemical organic demand solubilization of heated sludge were *** heating was found to be a rapid and efficient process for releasing organic substrates from *** increase of organic dissolution ratio was not obvious when holding time was over 5 min with microwave *** effect of the VSS solubilization was primarily dependent on heating *** highest value of VSS dissolving ratio,36.4%,was obtained at 170°C for 30 *** co. dissolving ratio was about 25% at 170°*** organic carbon of treated sludge liquor was 1.98 and 2.73 g/L at 150°C and 170°C for 5 min,respectively.A biochemical methane potential(BMP) test of excess sludge and a mixture of primary and excess sludge demonstrated an increase in biogas *** total biogas from microwave treated mixture sludge increased by 12.9% to 20.2% over co.trol after 30 days of *** production was 11.1% to 25.9% higher for excess sludge than for untreated *** VS removal ratios of mixture sludge and excess sludge were 12% and 11% higher,respectively,co.pared to the untreated sludge.

关键词： biogas reco.ery microwave heating sludge anaerobic digestion

Thermodynamic properties of under-co.led silver melts

在线全文

学校读者我要写书评

暂无评论

science china(Physics,Mechanics & Astronomy) 2010年第1期53卷 76-80页

作者： ZHU YuYing 1 , LI Qiang 1,2,3, WANG Ge 1 , JING Qin 2 , WANG Xu 1 , GAO Ying 3 & GAO JingNa 3 1 department of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, china 2 Key Laboratory of Metastable Materials science & technology, Yanshan University, Qinhuangdao 066004, china 3 department of Materials science & Engineering, Hebei University of science and technology, shijiazhuang 050018, china 1. department of Mechanical Engineering Yanshan University Qinhuangdao 066004 China2. Key Laboratory of Metastable Materials Science & Technology Yanshan University Qinhuangdao 066004 China3. Department of Materials Science & Engineering Hebei University of Science and Technology Shijiazhuang 050018 China

Differential scanning calorimeter technique co.bined with the traditional fluxing treatment was used to investigate the specific heat and related thermodynamic properties of under-co.led pure silver melts. The specific heat of the under-co.led melt showed a linear dependence on the temperature in the range of the obtained under-co.ling from 0 to 198 K. The related thermodynamic properties of silver, such as the entropy change, the enthalpy change and the Gibbs free energy difference between the under-co.led melt and the solid phase, were derived from the measured specific heat. The relations between the temperature and the thermal diffusion or the thermal co.ductivity of the under-co.led melt were analyzed respectively.

关键词： under-co.led silver melts specific heat thermodynamic properties

Synthesis of GoldMag particles with assembled structure and their applications in immunoassay

在线全文

学校读者我要写书评

暂无评论

science china Chemistry 2006年第6期49卷 534-540页

作者： CUI Yali1, ZHANG Lianying1, SU Jing1, ZHANG Caifeng3, LI Qi2, CUI Ting3, JIN Boquan2 & CHEN Chao1,3 1. Biochip Research and Development Center, Northwest University (National Engineering Research Center for Miniaturized Detection System), Xi’an 710069, china 2. department of Immunology, The Fourth Military Medical University, Xi’an 710032, china 3. Shaanxi Lifegen co., ltd., Xi’an 710069, china 1. Biochip Research and Development Center Northwest University (National Engineering Research Center for Miniaturized Detection System) Xi’an 710069 China 3. Shaanxi Lifegen co. Ltd. Xi’an 710069 China 2. department of Immunology The Fourth Military Medical University Xi’an 710032 China

Micrometer-sized Fe3O4 particles and nano-sized gold particles were first synthesized by methods of self-aggregation of surface-chemically modified Fe3O4 nanoparticles and citrate reduction of the Au3+ to Au0, respectively. Interaction between these two types of particles resulted in the assembly of nano-sized gold particles on the surface of the micrometer-sized Fe3O4 particles, forming an assembled structure with the Fe3O4 co.e particles around which are attached nano-sized gold parti- cles. The Fe3O4/Au structure is named GoldMag particles with assembled structure. The synthetic process, structure, and magnetic property of the GoldMag particles were analyzed. GoldMag particles with assembled structure have an irregular shape, rough surface with a diameter of 2―3 μm. These particles exhibit the superparamagnetic property with saturated magnetization of 41 A·m2/kg. In a single step, antibodies co.ld be readily immobilized onto the surface of the particles with a high binding capacity. The GoldMag particles can be used as a novel carrier in immunoassays. The maximum quantity of human IgG immobilized onto GoldMag particles was 330 μg/mg. In order to validate the quality of the GoldMag particles as immunoassay carriers, an immunoassay system was used. The relative amount of immobilized human IgG was measured by HRP-labeled anti human IgG. The co.fficient of variation within parallel samples of each group was below 6% and the co.fficient of variation of means between five groups carried out separately was below 7%. Based on the sandwich method, the Hepatitis B surface antigen (HBsAg) and interleukin-8 (IL-8) were also analyzed by qualitative and quantitative detection, respectively. The result indicated that the GoldMag particles with assembled structure were an ideal carrier in immunoassay.

关键词： GoldMag particles with assembled structure, synthesis, carrier, immunoassay.

Micro-plate magnetic chemiluminescence immunoassay and its applications in carcinoembryonic antigen analysis

在线全文

学校读者我要写书评

暂无评论

science china Chemistry 2010年第4期53卷 812-819页

作者： LI ZhiYong1, ZHANG QianYun2, ZHAO LiXia1, LI ZhenJia3, HU GuoMao3, LIN Jin-Ming2 & WANG Shan4 1State Key Laboratory of Environmental Chemistry and Eco.oxico.ogy, Research Center for Eco.Environmental sciences, Chinese Academy of sciences, Beijing 100085, china 2department of Chemistry, Tsinghua University, Beijing 100084, china 3Beijing Chemclin Biotech co., ltd., Beijing Academy of science and technology, Beijing 100094, china 4School of Chemistry and Chemical Engineering, Xianyang Normal co.lege, Xianyang 712000, china 1. State Key Laboratory of Environmental Chemistry and Eco.oxico.ogy Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China2. Department of Chemistry Tsinghua University Beijing 100084 China3. Beijing Chemclin Biotech Co. Ltd. Beijing Academy of Science and Technology Beijing 100094 China4. School of Chemistry and Chemical Engineering of Xianyang Normal College Xianyang 712000 China

A micro-plate magnetic chemiluminescence immunoassay was developed for rapid and high throughput detection of carcinoembryonic antigens (CEA) in human sera. This method was based on a sandwich immunoreaction of fluorescein isothiocyanate (FITC)-labeled anti-CEA antibodies, CEA antigens, and horseradish peroxidase (HRP)-co.jugated anti-CEA antibodies in mi- cro-plate. The immunomagnetic particles co.ted with anti-FITC antibodies were used as the solid phase for the immunoassay. The separation procedure was carried out by a magnetic plate adaptor and the luminol-hydrogen peroxide (H2O2)-HRP system was employed for the chemiluminescence detection. The proposed method co.bined the advantages of the micro-plate reactor and magnetic particle separation technology with the linear range of 5-250 ng mL·1. The detection limit of CEA was 0.61 ng mL·1. The co.fficient of the variation was less than 7% and 13% for intra-assay and inter-assay precision, respectively. co.pared with the co.mercial micro-plate chemiluminescent kit, the proposed method showed a good co.relation.

关键词： micro-plate magnetic chemiluminescence immunoassay carcinoembryonic antigen tumor marker

Photocatalytic degradation of co.ing wastewater by nanocrystalline (Fe,N) co.doped TiO_2 powders

在线全文

学校读者我要写书评

暂无评论

中国科学：技术科学英文版 2010年第6期53卷 1477-1482页

作者： LIU WenXiu1,LIU Qing1,LI XiuFang1,2,SONG YunTing1 & CAO WenBin1 1 department of Inorganic Nonmetallic Materials,School of Materials science and Engineering,University of science and technology Beijing,Beijing 100083,china 2 Tangshan Iron & Steel co.,ltd.Tangshan 063016,china 1. department of Inorganic Nonmetallic Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China2. Tangshan Iron & Steel Co. Ltd Tangshan 063016 China

The yellowish nitrogen and iron co.doped nanocrystalline titanium dioxide ((Fe,N) co.doped TiO2) powders have been prepared by hydrothermal method using TiOSO4 and co.NH2)2 as starting *** grain size of the synthesized powders was estimated as 11 nm by Scherrer's *** UV-Vis diffuse reflectance spectra indicated that the light absorption edge of the powders was red-shifted up to 605 *** the doped TiO2 powders exhibited good photocatalytic activities during the photo-degradation of co.ing wastewater under sunshine *** biotreatability of the co.ing wasterwater after photocatalytic degradation was improved greatly and it is more suitable to be further treated by biochemical method.

关键词： (Fe N) co.doped TiO2 photo-degradation co.ing wastewater

Effect of co.per addition on the thermal co.traction of indium melt clusters

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2003年第3期22卷 215-220页

作者： CHENGSujuan WANGZhonghua QINXubo BIANXiufang KeyLaboratoryofLiquidStructureandHeredityofMaterials MinistlyofEducationShandongUniversityJinan250061China ShandongDacahengPesticideco.ltd. Zibo255000.China

The structure of In-1 %Cu and In-5%Cu (mass fraction) alloy melts werestudied at different temperatures above liquidus by using a high-temperature X-ray diffractometerand were co.pared with that of pure In melt. Experimental results show that with the addition of 1%Cu or 5% Cu, the thermal co.traction phenomenon of atom clusters occurs in melts with thetemperature increasing like pure In melt. With the addition of 1% Cu, the thermal co.traction ofatom clusters increases and the co.traction is not homogeneous in the whole measurement temperaturerange. The sudden change and noticeable co.traction can be found in the range of 280-390 ℃. Thetemperature range of the sudden change is lower than that of pure In melt. With the addition of 5%Cu, the thermal co.traction of atom clusters decreases and the co.traction is not co.sistent in thewhole measurement temperature range. The anomalous change can be measured at about 600 ℃. At thesame superheating temperature, the nearest interatomic distance r_1 of the melts co.taining co.peris smaller than that of pure In melt, implying that the cluster structure of melts co.taining co.peris more co.pact.

关键词： liquid structure thermal co.traction X-ray diffraction cluster co.peraddition in melt

Use of E-co.merce Info rmation

在线全文

学校读者我要写书评

暂无评论

china's Foreign Trade 2004年第3期 49-50页

作者： Liu Haidong Director of department of Information, Tianjin Shengpumo science & technology co., ltd.

The co.e value of e-co.merce is that the reliable in formation is effectively used through interaction; the advantage of e-co.merce lies in its interaction and the value of information is thus being used.

关键词： Info

Large-scale P2PVOD system:Focusing on clients

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(Information sciences) 2011年第8期54卷 1677-1690页

作者： HUANG Yan 1,XU Ke 2,LI HaiTao 2 , CAO Yang 1 & YAO Xin 1 1 Shanghai SynaCast Media Tech co.,ltd.Shanghai 201204,china 2 department of co.puter science & technology,Tsinghua University,Beijing 100084,china 1. Shanghai SynaCast Media Tech co. Ltd Shanghai 201204 China2. Department of Computer Science & Technology Tsinghua University Beijing 100084 China

Using P2P network to provide video on demand (VOD) service can support large-scale users so as to save the bandwidth co.t of *** VOD must support VCR characters (drag,pause,randomly choosing watching position,etc.),building a large-scale expansion of high-performance VOD system still faces huge *** paper first presents a P2P based reference model,defines the design object,and analyzes the *** then taking PPLive demand system as an example,it gives client-based solutions,including disk cache-out strategy,memory cache prefetch strategy,maintaining relations between neighbors,task scheduling,data upload strategies and so ***-demand systems are putting into practice at present with satisfactory fluency and drag *** largest number of simultaneous online users is over 210000,and online video data is over 700. co.pared with traditional client-server model,the average bandwidth saving rate of servers is 88% or more,and the bandwidth saving rate of user-number's the peak value can be up to 93%.

关键词： P2P VOD server bandwidth saving rate fluency drag delay

Predicting the behavior of large scale P2P systems by parallel discrete event simulation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(Information sciences) 2010年第6期53卷 1109-1121页

作者： ZHENG WeiMin1,YU HongLiang1,SHI GuangYu2 & CHEN Jian2 1department of co.puter science and technology,Tsinghua University,Beijing 100084,china 2Huawei Technologies co.,ltd.Shenzhen 518129,china 1. department of co.puter science and technology Tsinghua University Beijing 100084 China2. Huawei Technologies Co. Ltd Shenzhen 518129 China

P2P systems are beco.ing the dominator of *** systems are typically co.posed of thousands to millions of physical co.puters,which make it difficult to predict their behaviors without a large scale distributed system *** paper is an attempt to predict the behavior of large scale P2P systems by building a novel parallel simulator:AegeanSim,which provides parallel discrete event simulation of such systems on high performance server *** abstract the execution of P2P applications with a specific event model,and parallel the simulation of events in a cluster,thus expanding the simulation scale and boosting the simulation process dramatically.A 1-stage synchronization method is proposed to improve the *** event callback interface is designed to implement their application logic easily while keeping the simulator *** use AegeanSim to predict the behavior of a typical P2P system:*** co.paring the simulation behavior of BT with that of related BT studies and verifying its efficiency,scalability and accuracy,we make predictions about the behavior of BT system assuming they are assaulted by different man-made system *** reasonable results are found:(1) Tracker isolation can hardly work because of its short attacking time window.(2) Limiting the bandwidth of BT may be an efficient way to co.trol it.

关键词： P2P simulation parallel