检索结果-南通市图书馆

Elimination of polycyclic musks in sewage treatment plants in Northeastern China

在线全文

cnki会议

学校读者我要写书评

暂无评论

Elimination of polycyclic musks in sewage treatment plants i...

持久性有机污染物论坛2011暨第六届持久性有机污染物全...

作者： Ningzheng Zhu~1,Liyan Liu~1,Feng Liu~1,Yifan Li~(1,2*) (1 International Joint Research Centre for Persistent toxic Substances(IJRC-PtS),State Key Laboratory of Urban Water Resource and environment,harbin Institute of technology(hIt),harbin,150090, China 2 science and technology branch,environment canada,toronto,ontario m3h5t4,canada

*** At the end of 19 century,one kind of Nitro musks was first synthesized,after then,synthetic musks began to replace the natural musks,and now synthetic musks is widely used in our daily life. Synthetic musks include three kinds:nitro musks,polycyclic musks and macrocyclic *** 1996, polycyclic musks took about 70%amount of the total synthetic musks. Polycyclic musks were commonly found to be target compounds in sewage treatment plants(StP),

关键词：

Atmospheric concentration of PAhs at a rural site of northeast China

在线全文

cnki会议

学校读者我要写书评

暂无评论

Atmospheric concentration of PAHs at a rural site of northea...

持久性有机污染物论坛2008暨第三届持久性有机污染物全...

作者： WanLi mA~1 YiFan LI~(1,2*) DeZhi SUN~1 hong QI~1 (1 International Joint Research Centre for Persistent toxic Substances (IJRC-PtS),State Key Lab of Urban Water Resource and environment,harbin Institute of technology (hIt),harbin 150090,China 2 science and technology branch,environment canada,toronto,ontario m3h5t4,canada

＜正＞*** Polycyclic aromatic hydrocarbons（PAhs）emitted in the atmosphere originate mainly from anthropogenic sources,such as oil spills,wastewater,vehicle exhaust and industrial *** are formed as by-products of inc...

关键词：

Concentration of PAhs in indoor dust in China

在线全文

cnki会议

学校读者我要写书评

暂无评论

Concentration of PAHs in indoor dust in China

持久性有机污染物论坛2011暨第六届持久性有机污染物全...

作者： Feng Zhang~1,hong Qi~1,Wan-Li ma~1,Li-Yan Liu~1,Yi-Fan Li~(1,2,*) (1 International Joint Research Centre for Persistent toxic Substances(IJRC-PtS),State Key Laboratory of Urban Water Resource and environment,harbin Institute of technology(hIt),harbin,150090, China 2 science and technology branch,environment canada,toronto,ontario m3h5t4,canada.

＜正＞*** Polycyclic aromatic hydrocarbons（PAhs） are ubiquitous persistent organic pollutants（POPs） among the most frequently encountered indoor *** on indoor pollution are important since most people spend more than 80%of their time *** dust can be a significant source of human exposure to hazardous substances including PAhs through non-dietary ingestion and dermal *** have hypothesized that particulate matter may be more closely linked to health effects, especially chronic lung *** it is necessary to investigate concentrations and distributions of

关键词：

Flame Retardants in multimedia in Northeastern Chinese Daling River

在线全文

cnki会议

学校读者我要写书评

暂无评论

Flame Retardants in Multimedia in Northeastern Chinese Dalin...

持久性有机污染物论坛2011暨第六届持久性有机污染物全...

作者： Luo Wang~1,Ye-Qing Sun~1,hong-Liang Jia~1,Xian-Jie Liu~1,meng Yang~1,Wen-Jun hong~1, Yi-Fan Li~(1,2*) (1 International Joint Research Centre for Persistent toxic Substances(IJRC-PtS),Dalian maritime University,Dalian 116026,China 2science and technology branch,environment canada,toronto, ontario m3h5t4,canada

＜正＞*** Flame retardants are ubiquitous chemical in the environment due to its heavy application,such as electrical wires and cables,computer connectors and plastic roofing materials for more than four *** it can provide protection from fires,environmental concerns have arisen for some of them because of their widespread detection in the environment,persistence in sediment and bioaccumulation in *** of dechloranes in the environment are,however,relatively few. After the discovery of DP in air,sediment and fish samples in 2006 and Dec 602,603 and 604 in

关键词：

tensile deformation of fine-grained mg at 4K,78K and 298K

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of magnesium and Alloys 2024年第6期12卷 2534-2556页

作者： m.Walag A.Kula P.Noga t.tokarski G.Cios m.Niewczas AGh University of Krakow Faculty of Non-Ferrous MetalsKrakowPoland AGh University of Krakow Academic Centre for Materials and NanotechnologyKrakowPoland materials science and Engineering McMaster UniversityHamiltonCanada

the impact of grain size,ranging from 0.9μm to 9μm,on the mechanical properties of commercially pure mg is investigated at temperatures of 4K,78K,and *** mechanisms governing plastic flow are influenced by both grain size and *** 4K and 78K,dominant deformation modes in mg involve dislocation glide and extension twinning,regardless of grain *** interactions between basal and non-basal dislocations and dislocations with grain boundaries promote an unusually high rate of work hardening in the plastic regime,leading to premature *** yield stress follows the hall-Petch relationshipσ_(y)∼k/√d,with the slope k increasing with decreasing *** 298K,in addition to dislocation glide and twinning,grain boundary sliding(GBS)becomes significant in samples with grain sizes below 3μm,considerably enhancing the material’s *** activation provides an additional recovery mechanism for dislocations accumulating at grain boundaries,facilitating their absorption during sliding and *** ofσrelationship suggests that the basal slip is the dominant dislocation mode in mg at *** grain size suppresses dislocation activity and twinning and increases GBS,resulting in lowerandσ*** conventional deformation modes coupled with enhanced GBS yields stress softening,breaking down the hall-Petch relationship in mg below 3μm grain size,leading to an inverse hall-Petch *** work reports new data on the strength,ductility,work hardening and fracture behaviour,and their variations with mg grain size across different temperature regimes.

关键词： Polycrystalline mg mechanical properties Deformation mechanisms Work-hardening texture evolution Cryogenic temperatures hall-Petch relationship

Effect of Cooling Rate on morphology and Oxygen Permeability of Polypropylene

在线全文

学校读者我要写书评

暂无评论

International Journal of minerals,metallurgy and materials 1999年第3期13卷 219-223页

作者： Wei tian Raymond t. Whodhams(material science and Engineering School, University of science and technology Beijing, Beijing 100083, China)(Department of Chemical Engineering and Applied Chemistry University of toronto, toronto m5S IA4, canada) material science and Engineering School University of Science and Technology Beijing Beijing 100083 China Department of Chemical Engineering and Applied Chemistry University of Toronto Toronto Ont. M5S IA4 Canada

the influence of different cooling rates on the morphology and oxygen permeabilityr of polypropylene containing ferrocene has been investigated. the spherulitic crystalline size and structure, which can affect the oxygen permeability are dependent upon the heating temperature, annealing time and cooling rate. the modulus of the composite was measured b}' dynamic mechanical analysis.

关键词： polypropylene oxygen permeability cooling rate

Effects of topographic Slopes on hydrological Proecsses and Climate

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric sciences 2001年第5期18卷 733-741页

作者： Jinliang Liu Climate Processes and Earth Observation Division, meteorological Service of canada, 4905 Dufferin Street, Downsview, ontario m3h 5t4, canada han-Ru Cho Department of Atmospheric science, National Central University, Chungli 320, taiwan Climate Processes and Earth Observation Division Meteorological Service of Canada Downsview Canada National Central University Chungli Taiwan

Based on previous research results on river re-distribution models, a modification on the effects of topographic slopes for a runoff parameterization was proposed and implemented to the NCAR's land sur- face model (LSm). this modification has two aspects firstly, the topographic slopes cause outflows from higher topography and inflows into the lower topography points; secondly, topographic slopes also cause decrease of infiltration at higher topography and increases of infiltration at lower topography. then changes in infiltration result in changes in soil molsture, surface fluxes and then in surface temperature, and eventual- ly in the upper atmosphere and the climate. this mechanism is very clearly demonstrated in the point bud- gets analysis at the Andes mountains vicinities. Analysis from a regional scale perspective in the mackenzie GEWEX Study (mAGS) area, the focus of the ongoing Canadian GEWEX program, shows that the modi- fied runoff parameterization does bring significant changes in the regional surface climate more important- ly, detailed analysis from a global perspective shows many encouraging improvements introduced by the modified LSm over the original model in simulating basic atmospheric climate properties such as thermodynamic features (temperature and humidity). All of these improvements in the atmospheric climate simulation illustrate that the inclusion of topographic effects in the LSm can force the AGCm to produce a more realistic model climate.

关键词： hydrological processes Runoff,Parameterization topographic slope Climate model Land surface model

Oxygen Permeability of Polypropylene Containing Polyisobutene with magnesium Acetate

在线全文

学校读者我要写书评

暂无评论

International Journal of minerals,metallurgy and materials 2000年第2期14卷 118-121页

作者： Wei tian Raymond t. Woodhams(material science and Engineering School, University of science and technology Beijing, Beijing 100083, China)(Dept. of Chemical Engineering and Applied Chemistry, University of toronto, torono m5S IA4, canada) material science and Engineering School University of Science and Technology Beijing Beijing 100083 China Dept. of Chemical Engineering and Applied Chemistry University of Toronto Toronto Ont. M5S IA4 Canada

the oxygen permeabilities of polypropylene films are reduced by adding a minor percentage of a polyisobutene ionomer. the polyisobutene ionomers were prepared by in situ salt exchange of magnesium acetate with maleated polyisobutenes of commercially available low relative molecular mass. the more polar magnesiurn salts aided phase separaion during crystallization from the molten polypropylene mixtusre. Scanning electron microscope photographs revealed that the polyisobotene ionomer is largely concentratd in the amorphous regions between the polypropylene spherulites, where the ionomer tends to concentrate during crystallization. the influence of the polyisobutene ionomer on the oxygen permeability of polypropylene was found to be slightly dependent upon the relative molecular mass of the polyisobutene precursor. Under optimum conditions, the oxygen permeability of polypropylene is reduced by 20%with only 1% additive.

关键词： oxygen permeability polypropylene polyisobutene

Analysis theory of random energy of train derailment in wind

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4期53卷 751-757页

作者： ChEN RuiLin 1,2,3 , ZENG QingYuan 3 , hUANG YunQing 1 , XIANG Jun 3 , WEN Ying 3 , GUO XiaoGang 2 , YIN ChangJun 2 , DONG hui 2 & ZhAO Gang 4 1 hunan Key Laboratory for Computation and Simulation in science and Engineering, Xiangtan University, Xiangtan 411105, China 2 School of Civil Engineering & mechanics, Xiangtan University, Xiangtan 411105, China 3 School of Civil Architecture, Central South University, Changsha 410075, China 4 AmEC, toronto m5A5G7, canada hunan Key Laboratory for Computation and Simulation in science and Engineering Xiangtan University Xiangtan China School of Civil Engineering & mechanics Xiangtan University Xiangtan China School of Civil Architecture Central South University Changsha China AmEC Toronto Canada

Based on the analysis theory of random energy of train derailment, an analysis theory of random energy of train derailment in wind is suggested. two methods are proposed -the time domain method and the frequency domain method of analysis theory of random energy of train derailment in wind. the curves of σ pw -v under various wind speeds are obtained through the computation. the original curve of σ p -v is expanded, which turns the analysis theory of random energy of train derailment into the all-weather theory. train derailment condition has been established under wind action. the first and second criterions of train derailment have been proposed in light of wind action. the analysis of train derailment cases at home or abroad is made, in- cluding the first analysis of Xinjiang train derailment case encountered 13-level of gale, which explained the inevitability of train derailment. the analysis theory of random energy of train derailment in wind shows its validity and accuracy. the input energy σ pw of the transverse vibration of train-track(bridge)-wind system is linked to train speed. With the establishment of the analysis theory of random energy of train derailment in wind, It is likely to initiate an all-weather speed limit map for a train or any high-speed train.

关键词： train derailment analysis theory of random energy of train derailment analysis theory of random energy of train de- railment in wind train derailment condition in wind the criterion of train derailment in wind train derailment case