检索结果-南通市图书馆

Sensitivity of green and blue-green algae to methyl tert-butyl ether

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2009年第4期21卷 514-519页

作者： CHEN Jianmeng ma jianyi CAO Wei WANG Pinwei TONG Senmiao SUN Yizhao College of Biological and Environmental Engineering Zhejiang University of Technology Hangzhou 310032 China School of Forestry and Biotechnology Zhejiang Forestry College Linan 311300 China

The toxicity of methyl tert-butyl ether （MTBE） to Chlorella ellipsoidea and Aphanizomenon flos-aquae was tested and assessed for a 15-d incubation with concentrations of MTBE from high （2.00×10^4 mg/L） to low （2 mg/L）. The results showed that the toxicity was low when the concentration of MTBE was in the range 1.00× 10^4-2.00× 10^4 mg/L （the greatest inhibition of growth-rate was 70%-71%, occurred during the day 1-5）. Low concentrations （2-500 rag/L） stimulated algal growth up to the greatest effect of 85%-200% when the concentration of MTBE was 50-100 mg/L during day 3-5. The toxicity of MTBE （72-120 h EC50） was 6.65×10^3-9.58×10^3 mg/L for C. ellipsoidea and that is 1.14× 10^4-2.00× 10^4 mg/L for A. floc-aquae. We found that the toxicity and ecological risk of MTBE for the algal community structure were low and the toxicity was influenced by the duration time of the test.

关键词： methyl tert-butyl ether toxicity green algae ecological risk cyanobacteria

Thermodynamics for nonequilibrium solvation and numerical evaluation of solvent reorganization energy

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2008年第12期51卷 1246-1256页

作者： LI XiangYuan WANG JingBo ma jianyi FU KeXiang HE FuCheng College of Chemical Engineering Sichuan UniversityChengdu 610065China

This work presents a thermodynamic method for treating nonequilibrium solvation. By imposing an extra electric field onto the nonequilibrium solvation system, a virtual constrained equilibrium state is prepared. In this way, the free energy difference between the real nonequilibrium state and the con-strained equilibrium one is simply the potential energy of the nonequilibrium polarization in the extra electronic field, according to thermodynamics. Further, new expressions of nonequilibrium solvation energy and solvent reorganization energy have been formulated. Analysis shows that the present formulations will give a value of reorganization energy about one half of the traditional marcus theory in polar solvents, thus the explanation on why the traditional theory tends to overestimate this quantity has been found out. For the purpose of numerical determination of solvent reorganization energy, we have modified Gamess program on the basis of dielectric polarizable continuum model. Applying the procedure to the well-investigated intramolecular electron transfer in biphenyl-androstane-naphthyl and biphenyl-androstane-phenanthryl systems, the numerical results of solvent reorganization energy have been found to be in good agreement with the experimental fittings.

关键词： nonequilibrium solvation constrained equilibrium solvent reorganization energy numerical evaluation

Polybenzimidazole functionalized electrolyte with Li-wetting and self-fluorination functionalities for practical Li metal batteries

在线全文

学校读者我要写书评

暂无评论

Infomat 2022年第5期4卷 174-186页

作者： Dongjiang Chen Yuanpeng Liu Chuan Xia Yupei Han Qingwei Sun Xuchang Wang Wei Chen Xian Jian Weiqiang Lv jianyi ma Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbinChina School of Physics University of Electronic Science and Technology of ChinaChengduChina School of materials and Energy University of Electronic Science and Technology of ChinaChengduChina Institute of Atomic and Molecular Physics Sichuan UniversityChengduSichuanChina

Rough Li plating,low ionic conductivity,and low thermal stability of conventional electrolytes post-primary challenges for achieving reliable high-capacity rechargeable lithium batteries,for which lithiummetal is frequently proposed as themost promising anode *** low-polarity commercial polypropylene/polyethylene separators fail to support the application of high-energy-density Li anodes due to their rigid physicochemical properties and the high reactivity of Li metal,leading to fatal dendrite formation and vigorous exothermic reaction with ***,we develop a Li-wetting,flame-retardant binary polymer electrolyte by functionalizing poly(vinylidene fluoride)(PVDF)separators with nonflammable polybenzimidazole(PBI)to build safe room-temperature solid-state electrolyte membranes.A dendrite-free LiFePO4 cell with the solid polymer electrolyte(SPE)delivers a discharge capacity of 127 mah g^(-1) at 25℃ with a capacity retention of 87.5%after 500 cycles at 0.5℃(0.15 ma cm^(-2)).Phase-field simulations and density functional theory calculations demonstrate that the negatively charged benzimidazole chains of PBI own superior affinity to lithium bis(trifluoromethanesulfonyl)imide(LiTFSI),and shares overlapping electron density with Li anode,giving rise to accelerated Li^(+)conduction at room temperature and uniform Li electrodeposition at the electrolyte/Li metal *** SPE is also flame-retardant since heat-resistant polytetrafluoroethylene and a dense,heat-blocking graphitized carbon layer are formed in intense heat throughdehydrogenation/fluorination of PVDF under the catalysis of Lewis base imidazole rings and the decomposition of benzimidazole rings in *** such fire-resistant mechanism is ever reported in conventional electrolytes.

关键词： flame-retardant properties Li metal polybenzimidazole solid polymer electrolyte uniform Li deposition

Synergistic effects on iodine release in potassium iodide solution by combination of ultrasound and visible light irradiations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Acoustics 2008年第2期27卷 169-180页

作者： ma Chunying XU jianyi LIU Xiaojun Key Lab of Modern Acoustics and Institute of Acoustics Nanjing University Nanjing 210093

Iodine release in potassium iodide solution has been investigated under the irradiations of ultrasound and visible light respectively and simultaneously. We have observed that the amount of iodine liberated under the combined irradiation of ultrasound and visible light is larger than the sum of that under the respective irradiations of ultrasound and visible light, indicating a synergistic effect of ultrasound and visible light irradiations. Based on the investigation of the reaction kinetics of iodine liberated, we have ascribed the synergistic effect to the perfect stirring of the photochemical reactor induced by the applying simultaneous ultrasound. The ideal stirring can result in the homogenization of the primary light effect in the whole reaction medium, which induces the acceleration of the photochemical reaction. On behavior of our knowledge, there are few reports on the investigations of utilizing the combination of ultrasonic energy and light energy to accelerate the reaction yield and rate as well as the kinetics of the reaction.

关键词： Synergistic effects on iodine release in potassium iodide solution by combination of ultrasound and visible light irradiations

Artificially physical disturbance on a "natural model" of chemical reactions

在线全文

学校读者我要写书评

暂无评论

Artificially physical disturbance on a "natural model" of ch...

中国化学会第29届学术年会

作者： Lindong Zou Jun Wang Quan Zhu jianyi ma Institute of Atomic and Molecular Physics Sichuan University School of Science Sichuan University of Science and Engineering School of Aeronautics & Astronautics Sichuan University

The study of gas-phase reaction dynamics has advanced to four-atom reactions.A combination of a calculation of full dimensional quantum dynamics and an accurate potential energy surface（PES）always shows a detailed mechanism of the experimental *** general,an exact quantum dynamics simulation needs a PES with spectral accuracy,but the error of the PES is inevitable in practical *** order to getting the response behavior of the dynamics properities for a certain distribance on the PES,quantum dynamics calculations and a 2D model PES are adopted in this *** surprisingly,the rate constant is sensitive to the distribance near the reaction barrier and the minimum energy path,but insensitive to the distribance in the other *** important and straightforward aspect is restated in this work,in the quantum dynamics simulation,adding an artificially disturbance on an accurate PES will help us to understand a given kind of the reaction deeply,and the accurate PES for a real system is a natural model for chemical reactions.

关键词： quantum dynamics potential energy surface physical disturbance natural model

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

透射式GaAs光电阴极研究

光电子技术 2010年第2期30卷 76-79页

作者：马建一孙键中国电子科技集团公司第五十五研究所南京210016

介绍了透射式GaAs光电阴极部件的制作技术和Cs、O激活机理;对Cs、O激活的GaAs光电阴极测试结果进行了分析,并指出了存在的问题和原因;讨论了提高GaAs光电阴极灵敏度的重要途径;提出了GaAs光电阴极灵敏度提高的技术方法以及进一步研究的... 详细信息

介绍了透射式GaAs光电阴极部件的制作技术和Cs、O激活机理;对Cs、O激活的GaAs光电阴极测试结果进行了分析,并指出了存在的问题和原因;讨论了提高GaAs光电阴极灵敏度的重要途径;提出了GaAs光电阴极灵敏度提高的技术方法以及进一步研究的方向。

关键词：透射式GaAs阴极铯氧激活光电灵敏度热清洗光谱响应曲线

在线全文

学校读者我要写书评

暂无评论

24种除草剂对蛋白核小球藻生长的效应

环境化学 2000年第6期19卷 518-522页

作者：马建义陈杰浙江省化工研究院暨国家南方农药创制中心浙江基地杭州310023

本文研究了9种不同作用机制的15类24种除草剂对蛋白核小球藻(Chlorellapyrenoidosa)的96h生长抑制急性毒性.急性毒性试验表明,24种除草剂对蛋白核小球藻的毒性都很高,比较而言,激素型除草剂毒性较低,光合作用抑制除草剂的毒性最高,其它... 详细信息

本文研究了9种不同作用机制的15类24种除草剂对蛋白核小球藻(Chlorellapyrenoidosa)的96h生长抑制急性毒性.急性毒性试验表明,24种除草剂对蛋白核小球藻的毒性都很高,比较而言,激素型除草剂毒性较低,光合作用抑制除草剂的毒性最高,其它类型居中.

关键词：除草剂急性毒性蛋白核小球藻生长生物监测

在线全文

学校读者我要写书评

暂无评论

生物质气化液对小麦生长及土壤酶的影响

重庆理工大学学报（自然科学） 2019年第10期33卷 180-184页

作者：唐玲涵马建义浙江农林大学林业与生物技术学院

研究了由农林废物资源生产的生物质气化液对植物生长及土壤中酶活性的影响。研究结果为开发生物质气化液的新用途提供理论依据。以小麦根长、茎长、根数和发芽率为指标研究了在体积分数为0.25%、1.25%、2.5%、5%情况下,3种生物质气化液... 详细信息

研究了由农林废物资源生产的生物质气化液对植物生长及土壤中酶活性的影响。研究结果为开发生物质气化液的新用途提供理论依据。以小麦根长、茎长、根数和发芽率为指标研究了在体积分数为0.25%、1.25%、2.5%、5%情况下,3种生物质气化液(竹醋液、木醋液和秸秆醋液)对小麦苗期生长影响以及对土壤中脲酶、蛋白酶、蔗糖酶的活性影响和抑制率。结果表明:低浓度生物质气化液有利于小麦的生长,并对土壤中的3种酶活性有积极的影响;而高浓度的生物质气化液对小麦生长与土壤酶活性提高却有消极影响;在相同的浓度下生物质气化液对小麦生长的抑制作用影响程度为:竹醋>木醋>秸秆醋,对土壤酶活性抑制率的影响程度为:脲酶>蛋白酶>蔗糖酶;低体积分数0.25%的处理有利于小麦的生长和3种酶活性的提高。虽然1.25%体积分数的生物质气化液对小麦生长具有负面影响,但对3种土壤酶的活性却有一定的提高作用。

关键词：竹醋木醋秸秆醋小麦生长土壤酶活性

在线全文

学校读者我要写书评

暂无评论

沈阳枢纽实现客货分线运行设计方案的研究

中国铁路 2007年第3期 60-62页

作者：马建义刘铁丰沈阳中铁铁道勘察设计院工程师辽宁沈阳110013

为配合哈大客运专线引入沈阳枢纽,解决货运列车穿行市区、客货共线交叉干扰严重的矛盾,在分析沈阳枢纽运输组织现状及主要存在问题的基础上,设计了修建沈阳枢纽东北环线、实现客货分线运行的方案。沈阳枢纽东北环线建成后,可有效疏解沈... 详细信息

为配合哈大客运专线引入沈阳枢纽,解决货运列车穿行市区、客货共线交叉干扰严重的矛盾,在分析沈阳枢纽运输组织现状及主要存在问题的基础上,设计了修建沈阳枢纽东北环线、实现客货分线运行的方案。沈阳枢纽东北环线建成后,可有效疏解沈阳西站至沈吉线、沈阳东站的货运车流与客车共线运行的问题,减轻货车穿越沈阳市区造成的交通干扰,减缓以客运为主的沈阳北站的运营压力。

关键词：沈阳枢纽客贷分线东北环线车流径路