检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

安全原理在高校实验室安全管理中的应用

中国现代教育装备 2023年第17期 46-48,64页

作者：赵宏亮康智勇孙啸涛高敏北京工商大学国有资产管理处北京100048

安全生产管理是一门跨自然科学和社会科学的综合性边缘学科,随生产的发展而发展。高校是我国科技创新发展的前沿阵地,实验室是高校孕育创新的沃土。近年来,随着我国科研能力不断增强、科研投入不断增大,高校科研活动的前沿性、创新性以... 详细信息

安全生产管理是一门跨自然科学和社会科学的综合性边缘学科,随生产的发展而发展。高校是我国科技创新发展的前沿阵地,实验室是高校孕育创新的沃土。近年来,随着我国科研能力不断增强、科研投入不断增大,高校科研活动的前沿性、创新性以及实验人员的流动性、复杂性对实验室安全管理提出了更高的要求。从事故致因和安全原理出发,讨论了系统原理、人本原理、预防原理、强制原理等安全原理在高校实验室安全管理中的应用,有助于提升高校实验室安全管理水平。

关键词：高等学校实验室安全管理安全原理

Depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 335-345页

作者： Feng Zhang Chenyang Zhang Linlin Wu Wei sun Hongliang Zhang Jianhua Chen Yong Pei Songjiang Li Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization Hunan International Joint Research Center for Efficient and Clean Utilization of Critical Metal Mineral ResourcesSchool of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China State Key Laboratory of Mineral Processing Beijing General Research Institute of Mining&MetallurgyBeijing 100160China Hunan Provincial Key Laboratory of Micro&Nano Materials Interfaces Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Department of Chemistry Xiangtan UniversityXiangtan 411105China China Railway Resource Group Co.Ltd Beijing 102300China

The depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite still lacked in-depth ***,the depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite was further systematically investigated with experiments and density functional theory(DFT)*** X-ray photoelectric spectroscopy(XPS)results,DFT calculation results,and frontier molecular orbital analysis indicated that sulfite ions were difficult to be adsorbed on sphalerite surface,suggesting that sulfite ions achieved depression effects on sphalerite through other non-adsorption ***,the oxygen content in the surface of sphalerite treated with sulfite ions in creased,which enhanced the hydrophilicity of the sphalerite and further increased the difference in hydrophilicity between sphalerite and ***,sulfite ions were chelated with lead ions to form PbSO_(3)in *** hydrophilic PbSO_(3)was more easily adsorbed on sphalerite than *** interaction between sulfite ions and lead ions could effectively inhibit the activation of *** addition the UV spectrum showed that after adding sulfite ions,the peak of perxanthate in the sphalerite treated xanthate solution was significantly stronger than that in the galena with xanthate solution,indicating that xanthate interacted more readily with sulfite ions and oxygen mo lecules within the sphalerite system,leading to the formation of ***,sulfite ions hardly depressed the flotation of ga lena and could promote the flotation of galena to some *** study deepened the understanding of the depression mechanism o sulfite ions on sphalerite and Pb^(2+)activated sphalerite.

关键词： sphalerite galena sulfite ion density functional theory depression mechanism

Fluorinated poly(p-triphenylene isatin) anion exchange membranes based on hydrophilic hydroxyl side chain modulation for fuel cells

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 702-709页

作者： Yiman Gu Yanchao Zhang Zhanyu Li Yijia Lei Baozeng sun Xiaoyu Yu Zhe Wang College of Chemistry and Life Science Changchun University of Technology College of Chemical Engineering Changchun University of Technology School of Materials Science and Engineering Changchun University of Technology Key Laboratory of Advanced Functional Polymer Membrane Materials of Jilin Province

The development of alkaline fuel cells is moving forward at an accelerated pace,and the application of ether-free bonded polymers to anion exchange membranes （AEMs） has been widely ***,the question of the“trade-off”between AEM ionic conductivity and dimensional stability remains *** strategy of inducing microphase separation to improve the performance of AEM has attracted much attention recently,but the design of optimal molecular structures is still being ***,this work introduced different ratios of 3-bromo-1,1,1-trifluoroacetone （x=40,50,and 60） into the main chain of poly（p-terphenylene isatin）.Because fluorinated groups have excellent hydrophobicity,hydrophilic hydroxyl-containing side chains are introduced to jointly adjust the formation of phase separation *** results show that PTI-PTF50-NOH AEM with the appropriate fluorinated group ratio has the best ionic conductivity and alkali stability under the combined effect of *** has an ionic conductivity of 133.83 mS cm-1at 80°*** addition,the OH-conductivity remains at 89%of the initial value at 80°C and 3 M KOH for 1056 h of *** cell polarization curve based on PTI-PTF50-NOH shows a power density of 734.76 mW cm-2at a current density of 1807.7 mA cm-2.

关键词： Anion exchange membranes Poly(p-terphenylene isatin) Hydrophilic-hydrophobic phase separation Fluorinated group

A Novel Model for Describing Rail Weld Irregularities and Predicting Wheel-Rail Forces Using a Machine Learning Approach

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2025年第1期142卷 555-577页

作者： Linlin sun Zihui Wang Shukun Cui Ziquan Yan Weiping Hu Qingchun Meng State Key Laboratory of High-Speed Railway Track System China Academy of Railway Sciences Corporation LimitedBeijing100081China Railway Engineering Research Institute China Academy of Railway Sciences Corporation LimitedBeijing100081China School of Aeronautic Science and Engineering Beihang UniversityBeijing100191China

Rail weld irregularities are one of the primary excitation sources for vehicle-track interaction dynamics in modern high-speed *** can cause significant wheel-rail dynamic interactions,leading to wheel-rail noise,component damage,and *** researchers have employed the vehicle-track interaction dynamic model to study the dynamic interactions between wheel and rail induced by rail weld geometry ***,the cosine wave model used to simulate rail weld irregularities mainly focuses on the maximum value and neglects the geometric *** this study,novel theoretical models were developed for three categories of rail weld irregularities,based on measurements of the high-speed railway from Beijing to *** vertical dynamic forces in the time and frequency domains were compared under different running *** forces generated by the rail weld irregularities that were measured and modeled,respectively,were compared to validate the accuracy of the proposed ***,based on the numerical study,the impact force due to rail weld irrregularity is modeled using an Artificial Neural Network(ANN),and the optimum combination of parameters for this model is *** results showed that the proposed model provided a more accurate wheel/rail dynamic evaluation caused by rail weld irregularities than that established in the *** ANN model used in this paper can effectively predict the impact force due to rail weld irrregularity while reducing the computation time.

关键词： Rail weld irregularity high-speed railway vehicle-track coupled dynamics wheel/rail dynamic vertical force artificial neural networks

基于无线传感网络通信技术的变电站运行环境感知方法

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

通信电源技术 2024年第18期41卷 195-197页

作者：刘迎新孙晓韬李珍姚力军王梅娜国网甘肃省电力公司兰州倚能电力(集团)有限公司甘肃兰州730070 国网天水供电公司甘肃天水741000 国网甘肃省电力公司发展事业部(经济技术研究院) 甘肃兰州730050 甘肃农业大学甘肃兰州730070 大唐甘肃发电有限公司碧口水力发电厂甘肃陇南746412

变电站内部环境复杂多变,关键设备密集,导致环境感知受限,覆盖率偏低。因此,提出基于无线传感网络通信技术的变电站运行环境感知方法。通过部署AM2302温湿度传感器和CC2530芯片的无线节点,结合ZigBee技术和频分复用,构建稳定、低功耗网... 详细信息

变电站内部环境复杂多变,关键设备密集,导致环境感知受限,覆盖率偏低。因此,提出基于无线传感网络通信技术的变电站运行环境感知方法。通过部署AM2302温湿度传感器和CC2530芯片的无线节点,结合ZigBee技术和频分复用,构建稳定、低功耗网络,实现变电站环境参数的实时感知、数据传输及全方位监测。实验结果表明,感知方法能够显著提升感知区域覆盖率,实现全面准确感知。

关键词：无线传感网络无线通信技术变电站运行环境感知方法

Influence of introducing Zr,Ti,Nb and Ce elements on externally solidified crystals and mechanical properties of high-pressure die-casting Al–Si alloy

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 147-153页

作者： Junjie Li Wenbo Yu Zhenyu sun Weichen Zheng Liangwei Zhang Yanling Xue Wenning Liu Shoumei Xiong Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Traffic&Transportation Engineering Central South UniversityChangsha 410075China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

High pressure die casting(HPDC)AlSi10Mn Mg alloy castings are widely used in the automobile *** can optimize the mechanical properties of castings through heat treatment,while the release of thermal stress arouses the deformation of large integrated ***,the development of non-heat treatment Al alloys is becoming the hot *** addition,HPDC contains externally solidified crystals(ESCs),which are detrimental to the mechanical properties of *** achieve high strength and toughness of non-heat treatment die-casting Al-Si alloy,we used AlSi9Mn alloy as matrix with the introduction of Zr,Ti,Nb,and *** influences on ESCs and mechanical properties were systematically investigated through three-dimensional reconstruction and thermodynamic *** results reveal that the addition of Ti increased ESCs'size and porosity,while the introduction of Nb refined ESCs and decreased ***,large-sized Al_3(Zr,Ti)phases formed and degraded the mechanical *** introduction of Ce resulted in the poisoning effect and reduced mechanical properties.

关键词： aluminium alloy high-pressure die-casting externally solidified crystals non-heat treatment

Deep insight into the charge transfer interactions in 1,2,4,5-tetracyanobenzene-phenazine cocrystal

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第10期32卷 3007-3010页

作者： Hongnan Wu Yajing sun Lingjie sun Liwei Wang xiaotao Zhang Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin UniversityTianjin 300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207China Institute of Molecular Aggregation Science of Tianjin University Tianjin 300072China

A new charge transfer cocrystal of 1,2,4,5-tetracyanobenzene(TCNB)-phenazine(PTC)was prepared by solvent evaporation *** donor and acceptor molecules of cocrystal are stacked face to face with a mixed-stacking,implying a strong charge transfer(CT)interactions in the cocrystal *** spectroscopic studies,single-crystal X-ray diffraction structure,density functional theory(DFT)and Hirschfield surfaces calculations are carried out to explore the relationship between structure and properties of cocrystal system,which show that the intermolecular interactions in PTC are stronger than those of single components,leading to the stability and photophysical behaviors of cocrystal different from their constitute *** study will be helpful for the design and preparation of multifunctional cocrystal materials.

关键词： Cocrystal Charge transfer 1,2,4,5-Tetracyanobenzene Phenazine Solvent evaporation method

基于LabVIEW和Matlab的滚动轴承故障监测与诊断

在线全文

学校读者我要写书评

暂无评论

青岛大学学报（工程技术版） 2017年第3期32卷 56-61页

作者：孙晓涛高军伟毛云龙张彬董宏辉青岛大学自动化与电气工程学院山东青岛266071 北京交通大学轨道交通控制与安全国家重点实验室北京100044

针对轨道车辆滚动轴承故障的多发性和重要性,本文基于虚拟仪器技术,通过LabVIEW以及Matlab来编程操作,设计了一种滚动轴承故障监测与诊断系统,通过传感器采集振动信号,经过信号调理模块对信号进行相应的滤波放大处理,再通过数据采集卡NI... 详细信息

针对轨道车辆滚动轴承故障的多发性和重要性,本文基于虚拟仪器技术,通过LabVIEW以及Matlab来编程操作,设计了一种滚动轴承故障监测与诊断系统,通过传感器采集振动信号,经过信号调理模块对信号进行相应的滤波放大处理,再通过数据采集卡NI9215输入到实时控制器CompactRIO中,CompactRIO则通过控制器面板上的RJ-45以太网端口,使用以太网连接控制器至上位机,上位机采用LabVIEW编程,将数据传送给上位机进行数据的显示存储与处理分析,然后调用Matlab,该系统通过小波包变换提取轴承的故障特征向量,再利用RBF径向基函数神经网络对故障类型进行诊断分析。分析结果表明,该系统能够及时、准确的实现振动信号采集和分析、信号传输、故障诊断等功能,拥有灵活、易用的人机交互界面,实现了软、硬件资源的良性共享,具有较好的实用价值。

关键词：滚动轴承 LabVIEW Matlab 数据采集故障诊断

Flexible molecules dedicate to release strain of inverted inorganic perovskite solar cell

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 87-93页

作者： Hongrui sun Sanlong Wang Pengyang Wang Yali Liu Shanshan Qi Biao Shi Ying Zhao Xiaodan Zhang Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage Center State Key Laboratory of Photovoltaic Materials and CellsNankai University Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Haihe Laboratory of Sustainable Chemical Transformations Engineering Research Center of Thin Film Photoelectronic Technology of Ministry of Education Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)

The tensile strain in inorganic perovskite films induced by thermal annealing is one of the primary factors contributing to the inefficiency and instability of inorganic perovskite solar cells （IPSCs）,which reduces the defect formation ***,a flexible molecule 5-maleimidovaleric acid （5-MVA） was introduced as a strain buffer to release the residual strain of *** anhydride and carboxyl groups in 5-MVA interact strongly with the uncoordinated Pb2+through Lewis acid-base reaction,thus tightly“pull”the perovskite *** in-between soft carbon chain increased the structural flexibility of CsPbI2.85Br0.15perovskite materials,which effectively relieved the intrinsic internal strain of CsPbI2.85Br0.15,resisted the corrosion of external strain,and also reduced the formation of defects such as VIand *** addition,the introduction of 5-MVA improved crystal quality,passivated residual defects,and narrowed energy level ***,power conversion efficiency （PCE） of NiOxbased inverted IPSCs increased from 19.25% to 20.82% with the open-circuit voltage enhanced from 1.164 V to 1.230 *** release of strain also improved the stability of CsPbI2.85Br0.15perovskite films and devices.

关键词： Inverted inorganic perovskite solar cells Flexible molecules Strain release Crystallization Energy barrier High PCE