检索结果-南通市图书馆

Advanced TEM Characterization for Single-atom Catalysts:from Ex-situ Towards In-situ

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2022年第5期38卷 1172-1184页

作者： wang guowei KE Xiaoxing SUI Manling Beijing Key Laboratory of Microstructure and Properties of Solids Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124P.R.China

Clean energy innovation has triggered the development of single-atom catalysts(SACs)due to their excellent catalytic activity,high tunability and low cost.The success of SACs for many catalytic reactions has opened a new field,where the fundamentals of catalytic property-structure relationship at atomic level await exploration,and thus raises challenges for structural characterization.Among the characterization techniques for SACs,aberration-corrected transmission electron microscopy(TEM)has become an essential tool for direct visualization of single atoms.In this review,we briefly summarize recent studies on SACs using advanced TEM.We first introduce TEM methods,which are particularly important for SACs characterization,and then discuss the applications of advanced TEM for SAC characterization,where not only atomic dispersion of single atoms can be studied,but also the distribution of elements and the valence state with local coordination can be resolved.We further extend our review towards in-situ TEM,which has increasing importance for the fundamental understanding of catalytic mechanism.Perspectives of TEM for SACs are finally discussed.

关键词： Single-atom catalyst Transmission electron microscopy(TEM) Scanning transmission electron microscopy(STEM) Electron energy loss spectroscopy(EELS) Energy dispersive X-ray spectroscopy(EDX) In-situ TEM

A review of research progress on continuous cropping obstacles

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

Frontiers of Agricultural Science and Engineering 2024年第2期11卷 253-270页

作者： Kunguang wang Qiaofang LU Zhechao DOU Zhiguang CHI Dongming CUI Jing MA guowei wang Jialing KUANG Nanqi wang Yuanmei ZUO College of Resources and Environmental Sciences State Key Laboratory of Nutrient Use and Management National Academy of Agriculture Green Development China Agricultural University College of Resources and Environmental Sciences Southwest University Yunnan ICL YTH Phosphate Research and Technology Co. Ltd.

Due to the increasing global population and limited land resources, continuous cropping has become common. However, after a few years of continuous cropping, obstacles often arise that cause soil degeneration, decreased crop yield and quality, and increased disease incidence, resulting in significant economic losses. It is essential to understand the causes and mitigation mechanisms of continuous cropping obstacles(CCOs) and then develop appropriate methods to overcome them. This review systematically summarizes the causes and mitigation measures of soil degradation in continuous cropping through a meta-analysis. It was concluded that not all continuous cropping systems are prone to CCOs. Therefore, it is necessary to grasp the principles governing the occurrence of diseases caused by soilborne pathogens in different cropping systems, consider plant–soil-organisms interactions as a system, scientifically regulate the physical and chemical properties of soils from a systems perspective, and then regulate the structure of microbial food webs in the soil to achieve a reduction in diseases caused by soilborne pathogens and increase crop yield ultimately. This review provides reference data and guidance for addressing this fundamental problem.

关键词： Continuous cropping obstacles rhizosphere regulation soil microecological environment

Influence of the Gaussian colored noise and electromagnetic radiation on the propagation of subthreshold signals in feedforward neural networks

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) 2021年第4期64卷 847-857页

作者： GE MengYan wang guowei JIA Ya Department of Physics Central China Normal UniversityWuhan 430079China

Iterative methods are used to simulate the in vitro feedforward neural networks in physiological experiments.Emissivity can be propagated to a minimum of ten groups.However,the discharge activity of each group will be more synchronized.The feedforward neural networks have a wide range of applications in machine learning,and the weight of synapses considerably influences the propagation of weak signals.Herein,we investigated the effect of Gaussian colored noise and electromagnetic radiation on the propagation of the subthreshold excitatory postsynaptic current signals in the input layer of the multilayer Izhikevich neural feedforward networks.In the absence of electromagnetic radiation,the excitatory postsynaptic current signal is stably propagated and amplified in multilayer feedforward neural networks under the optimal Gaussian colored noise strength or correlation time in the output layer of the network.Compared with the case in which there is no electromagnetic radiation,the presence of electromagnetic radiation slightly reduces the propagation of weak signals.Further,the time required to propagate the excitatory postsynaptic current signal to the output layer increases with the increasing feedback gain.The feedforward neural network considered in this study is a considerably simple model.More complex structures,such as backward connection and delayed feedback,can be observed in real biological systems.Hence,the next step will be to study more complex neural models with neuron models based on the physiological experimental data and compare them with real biological systems.Furthermore,the study of neural networks can be combined with an experimental study about the auditory nervous system of bats to understand the biological mechanism associated with the auditory system function of bats from two perspectives.

关键词： feedforward neural network colored noise electromagnetic radiation signal propagation

理解当地人对文化遗产旅游的支持意图:S-O-R理论视角

在线全文

学校读者我要写书评

暂无评论

Journal of Resources and Ecology 2024年第3期15卷 745-753页

作者：黄秋爱邹统钎王国为宋亮北京第二外国语学院旅游科学学院北京100024 丝绸之路国际旅游和文化遗产大学旅游学院撒马尔罕999033乌兹别克斯坦北京第二外国语学院中国文化和旅游研究院北京100024 中国中医科学院中医基础理论研究所北京100700

文化遗产旅游因其文化遗产的特殊性而逐渐受到人们的关注,而发展文化遗产旅游需要当地人的支持。在文章中,我们先引入了Stimulus-Organism-Response(S-O-R)理论,再提出关于主观规范、个人规范、当地人感知及其支持意图间关系的研究模型... 详细信息

文化遗产旅游因其文化遗产的特殊性而逐渐受到人们的关注,而发展文化遗产旅游需要当地人的支持。在文章中,我们先引入了Stimulus-Organism-Response(S-O-R)理论,再提出关于主观规范、个人规范、当地人感知及其支持意图间关系的研究模型。结果表明,主观规范显著影响当地人的感知(包括经济感知、文化感知和环境感知)和个人规范。另外,当地人的感知和个人规范也显著影响当地人对文化遗产旅游的支持意图。研究结果有助于我们更好地理解当地人对文化遗产旅游的支持意图的影响因素及影响机理,具有一定的理论意义和实践意义。

关键词：文化遗产旅游主观规范个人规范当地人的感知支持意图

Vertical 3D Nanostructures Boost Efficient Hydrogen Production Coupled with Glycerol Oxidation Under Alkaline Conditions

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2023年第10期15卷 609-621页

作者： Shanlin Li Danmin Liu guowei wang Peijie Ma Xunlu wang Jiacheng wang Ruguang Ma Key Laboratory of Advanced Functional Materials Ministry of EducationFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124People’s Republic of China The State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China School of Materials Science and Engineering Suzhou University of Science and Technology99 Xuefu RoadSuzhou 215011People’s Republic of China School of Materials Science and Engineering Taizhou UniversityTaizhou 318000People’s Republic of China Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials College of Materials Science and EngineeringNorth China University of Science and TechnologyTanshang 063210People’s Republic of China

Hydrogen production from electrolytic water is an important sustainable technology to realize renewable energy conversion and carbon neutrality.However,it is limited by the high overpotential of oxygen evolution reaction(OER)at the anode.To reduce the operating voltage of electrolyzer,herein thermodynamically favorable glycerol oxidation reaction(GOR)is proposed to replace the OER.Moreover,vertical Ni O flakes and NiMoNH nanopillars are developed to boost the reaction kinetics of anodic GOR and cathodic hydrogen evolution,respectively.Meanwhile,excluding the explosion risk of mixed H_2/O_(2),a cheap organic membrane is used to replace the expensive anion exchange membrane in the electrolyzer.Impressively,the electrolyzer delivers a remarkable reduction of operation voltage by 280 mV,and exhibits good long-term stability.This work provides a new paradigm of hydrogen production with low cost and good feasibility.

关键词： Hydrogen evolution reaction Glycerol oxidation reaction Oxygen evolution reaction Flow cell Nanostructure

基板预热温度对选区激光熔化AlSi9Mg1ScZr微观组织及力学性能的影响

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2024年第4期53卷 1075-1085页

作者：张璨王国伟朱京玺王利利沈显峰叶寒王超黄姝珂中国工程物理研究院机械制造工艺研究所四川绵阳621900 南昌大学先进制造学院江西南昌330031

研究了基板预热温度对选区激光熔化(SLM)制备AlSi9Mg1ScZr合金样品微观组织及力学性能的影响,在35、85、135℃3种不同基板预热温度下,制备了SLM样品并分别进行微观组织观察及性能测试。结果表明,基板预热温度设置为135℃时,由于基板预... 详细信息

研究了基板预热温度对选区激光熔化(SLM)制备AlSi9Mg1ScZr合金样品微观组织及力学性能的影响,在35、85、135℃3种不同基板预热温度下,制备了SLM样品并分别进行微观组织观察及性能测试。结果表明,基板预热温度设置为135℃时,由于基板预热温度和激光扫描热输入的共同影响,使合金在打印过程产生了原位时效效应,在保留细小枝晶和Si网格的同时促进了元素从过饱和固溶体中析出。相比基板预热35℃的样品,纳米尺度的Mg2Si相和Si相在α-Al基体及枝晶界析出的数量显著增加,起到了提高强度的作用;但微米尺度富Fe相的析出对塑性产生了负面影响。在基板预热温度设置为135℃时,制备的AlSi9Mg1ScZr合金在0°方向上屈服强度高达360 MPa、抗拉强度高达502 MPa、伸长率为7%;90°方向上屈服强度高达331 MPa、抗拉强度高达511 MPa、伸长率为5.4%。本研究通过提高基板预热温度,在SLM过程中实现了SLM样品的原位时效,改善了SLM制备AlSi9Mg1ScZr合金的微观组织,在不经过后续热处理的情况下,大幅降低了残余应力,得到了超高强度的AlSi9Mg1ScZr合金样品。

关键词：选区激光熔化 AlSi9Mg1ScZr合金基板预热微观组织力学性能

在线全文

学校读者我要写书评

暂无评论

上海大剧院:“东方舞台美学”定义艺术地标

艺术管理（中英文） 2024年第1期 131-138页

作者：王国伟宋子祺同济大学人文学院上海200092 同济大学建筑与城市规划学院上海200092

大剧院作为一座城市的“艺术地标”,一方面体现在由核心的地段位置、突出的建筑形象所传达的物理标识属性上;另一方面,则体现在剧院作为艺术创作与展演主体,通过内容策划能力、市场运营能力、教育传播能力,特别是其品牌影响力综合构建... 详细信息

大剧院作为一座城市的“艺术地标”,一方面体现在由核心的地段位置、突出的建筑形象所传达的物理标识属性上;另一方面,则体现在剧院作为艺术创作与展演主体,通过内容策划能力、市场运营能力、教育传播能力,特别是其品牌影响力综合构建的文化属性上。一座城市的艺术地标,代表着一个地方的文化高度和美学品位。从引进、参与制作,到主导创作,经过20年的努力,上海大剧院进入发展的新十年。“东方舞台美学”为第三个十年发展定位,包含秉持世界一流的制作水准,活化中国传统艺术的经典,原创高质量的剧目,向海内外市场输出高质量的中国风舞台艺术,最终建构东方美学的艺术品牌。这种建构路径,是一个融创作运营模式、舞台艺术实践和空间拓展方式三个维度为一体的系统工程。上海大剧院将由此彰显未来艺术地标的新属性,进而重塑城市文化的新形态。

关键词：上海大剧院 “东方舞台美学” 艺术地标

在线全文

学校读者我要写书评

暂无评论

油井内波纹板表面结垢规律及预测模型

石油机械 2024年第2期52卷 91-98页

作者：唐玉强冯进夏齐汪国威张慢来长江大学机械工程学院中国石油天然气集团有限公司采油采气重点实验室长江大学分室

针对油田开发过程中井下抽油泵结垢问题,采用波纹板作为泵前预结垢装置的结垢元件,分析其结垢规律。基于Kern-Seaton结垢速率模型,推导了结垢沉积的半经验公式;运用湍流-化学相互作用模型和DPM模型模拟了CaCO_(3)颗粒在管道内波纹板表... 详细信息

针对油田开发过程中井下抽油泵结垢问题,采用波纹板作为泵前预结垢装置的结垢元件,分析其结垢规律。基于Kern-Seaton结垢速率模型,推导了结垢沉积的半经验公式;运用湍流-化学相互作用模型和DPM模型模拟了CaCO_(3)颗粒在管道内波纹板表面的结垢过程,定量分析了温度、流速和颗粒质量浓度的倍数对结垢速率的影响规律;复配井下产出液,进行了室内结垢试验。试验结果表明:数值模拟和室内试验有着较好的一致性,温度上升颗粒质量浓度增加,对碳酸钙的结垢沉积具有促进作用;而流速的升高则能抑制碳酸钙的结垢沉积。在实际生产过程中,井内温度和结垢离子的质量浓度不可控,可以通过适当降低产出液的流速,增加波纹板表面的结垢量,以此达到减轻抽油泵结垢的目的。所得结论可为油田防垢、除垢提供理论依据和新思路。

关键词：波纹板沉积速率结垢理论数值模拟 CaCO_(3)结垢

单胞构型和结构参数对SLM成形梯度点阵结构压缩性能的影响

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2024年第4期53卷 1021-1031页

作者：张博王国伟孙明艳秦煜沈显峰王超黄姝珂方辉中国工程物理研究院机械制造工艺研究所四川绵阳621900 四川大学机械工程学院四川成都610065

梯度点阵结构由于压缩时具有优秀的吸能能力,目前常作为吸能组件被应用于航天、国防和医疗等领域。但随着现代工业的发展,工程领域对其压缩性能提出了更高的要求,为使其进一步优化,有必要探讨单胞构型、结构参数和压缩性能之间的关系。... 详细信息

梯度点阵结构由于压缩时具有优秀的吸能能力,目前常作为吸能组件被应用于航天、国防和医疗等领域。但随着现代工业的发展,工程领域对其压缩性能提出了更高的要求,为使其进一步优化,有必要探讨单胞构型、结构参数和压缩性能之间的关系。因此本研究通过选区激光熔化(selective laser melting,SLM)成形了2种梯度差的AlSi10Mg变杆径梯度体心立方(body-centered cubic,bcc)和金刚石(diamond,Diam)结构,结合有限元分析(finite element analysis,FEA)研究梯度差对压缩性能的影响,并对2种单胞构型进行对比。准静态单轴压缩实验的结果表明,在同相对密度下,当单胞构型相同时,随着梯度差的增加单位体积吸能量明显增加,而梯度差相同时,Diam梯度点阵结构的压缩模量、屈服强度、抗压强度和最大峰值应力均高于bcc,同时其单位体积吸能量和吸能效率也高于bcc。

关键词：选区激光熔化梯度点阵结构压缩性能有限元分析