检索结果-南通市图书馆

Symmetry-driven half-integer conductance quantization in Cobalt–fulvalene sandwich nanowire

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2023年第1期9卷 314-321页

作者： zhuoling Jiang Kah-Meng Yam Yee Sin ang Na Guo Yongjie z.ang Hao Wang Chun z.ang Department of Physics and Centre for Advanced 2D Materials National University of SingaporeSingapore 117551Singapore Science Mathematics and Technology(SMT)ClusterSingapore University of Technology and DesignSingapore 487372Singapore Department of Chemistry National University of SingaporeSingapore 117543Singapore National University of Singapore Chongqing Research Institute 401123 ChongqingChina

Precise manipulation and monitoring spin transport in one-dimensional (1D) systems is a long-sought goal in the field of nano-spintronics. Based on first-principles calculations, we report the observation of half-integer conductance quantization in the Cobalt-fulvalene sandwich nanowire. Compared with a pure monatomic Cobalt wire, the introduction of fulvalene molecules leads to threeimportant features: Firstly, the strong coupling between the fulvalene and the Cobalt prevents the contamination of the ambientair, ensuring both chemical and physical stabilities;Secondly, the fulvalene symmetry-selectively filters out most of the d-typeorbitals of the Cobalt while leaving a single d-type orbital to form an open spin channel around the Fermi level, which offers amechanism to achieve the observed half-integer conductance;Thirdly, it maintains a superexchange coupling between adjacent Coatoms to achieve a high Curie temperature. Spin transport calculations show that this half-metallic nanowire can serve as a perfectspin filter or a spin valve device, thus revealing the potential of Cobalt-fulvalene sandwich nanowire as a promising building blockof high-performance spintronics technology.

关键词： sandwich coupling transport

Learners’motivational response to the Science,PE,&Me!curriculum:A situational interest perspective

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2021年第2期10卷 243-251页

作者： Senlin Chen Haichun Sun Xihe zhu ang Chen Catherine D.Ennis(Posthumous) School of Kinesiology Louisiana State UniversityBaton RougeLA 70803USA Department of Teaching and Learning University of South FloridaTampaFL 33620USA Department of Human Movement Sciences Old Dominion UniversityNorfolkVA 23529USA Department of Kinesiology University of North Carolina at GreensboroGreensboroNC 27402USA

Background:The Science,PE,&Me!(SPEM)curriculum is a concept-based physical education curriculum that offers students coherent educational experiences for constructing health-related fitness knowledge through movement *** purpose of this study was to evaluate students’motivational response to the SPEM curriculum from the situational interest ***:The study used a cluster randomized controlled design in which 30 elementary schools in one of the largest metropolitan areas in the eastern United States were randomly assigned to an experimental or comparison *** all students in the 3rd,4th,and 5th grades in the targeted schools were eligible to participate in the study,a random sample of students from the experimental(n=1749;15 schools)and comparison groups(n=1985;15 schools)provided ***’motivational response to the SPEM curriculum or comparison curriculum was measured using the previously validated Situational Interest *** were analyzed using structural mean ***:The results demonstrated that the experimental group(as reference group)showed significantly higher enjoyment(z=-2.01),challenge(z=-6.54),exploration(z=-12.195),novelty(z=-8.80),and attention demand(z=-7.90)than the comparison ***:The findings indicate that the SPEM curriculum created a more situationally interesting context for learning than the comparison physical education curriculum.

关键词： Constructivist learning theory Curriculum intervention Elementary physical education Learner motivation Structural mean modeling

Influence of angiotensin II on α₁-Adrenergic Receptors Function in Rat Aorta and Expression in Vascular Smooth Muscle Cells

在线全文

学校读者我要写书评

暂无评论

Journal of Biosciences and Medicines 2024年第4期12卷 123-134页

作者： Itzell Alejandrina Gallardo-Ortíz Juan Pablo de Jesús Benítez-Garrido Santiago C. Sigrist-Flores Juan Javier López-Guerrero Enrique Hong Rafael Villalobos-Molina Unidad de Biomedicina Facultad de Estudios Superiores Iztacala Universidad Nacional Aut&#243noma de M&#233xico Tlalnepantla M&#233xico Carrera de Enfermerí a Facultad de Estudios Superiores Iztacala Universidad Nacional Aut&#243noma de M&#233xico Tlalnepantla M&#233xico Departamento de Farmacobiologí a Centro de Investigaci&#243n and de Estudios Avanzados-IPN Ciudad de M&#233xico M&#233xico Carrera de Mé dico Cirujano Facultad de Estudios Superiores Iztacala Universidad Nacional Aut&#243noma de M&#233xico Tlalnepantla M&#233xico

angiotensin II (ang II) is the main mediator of the Renin-angiotensin-System acting on AT1 and other AT receptors. It is regarded as a pleiotropic agent that induces many actions, including functioning as a growth factor, and as a contractile hormone, among others. The aim of this work was to examine the impact of ang II on the expression and function of α1-adrenergic receptors (α1-ARs) in cultured rat aorta, and aorta-derived smooth muscle cells. Isolated Wistar rat aorta was incubated for 24 h in DMEM at 37˚C, then subjected to isometric tension and to the action of added norepinephrine, in concentration-response curves. ang II was added (1 × 10−5 M), and in some experiments, 5-Methylurapidil (α1A-AR antagonist), AH11110A (α1B-AR antagonist), or BMY-7378 (α1D-AR antagonist), were used to identify the α1-AR involved in the response. Desensitization of the contractile response to norepinephrine was observed due to incubation time, and by the ang II action. α1D-AR was protected from desensitization by BMY-7378;while RS-100329 and prazosin partially mitigated desensitization. In another set of experiments, isolated aorta-derived smooth muscle cells were exposed to ang II and α1-ARs proteins were evaluated. α1D-AR increased at 30 and 60 min post ang II exposure, the α1A-AR diminished from 1 to 4 h, while α1B-AR remained unchanged over 24 h of ang II exposure. ang II induced an increase of α1D-AR at short times, and BMY-7378 protected α1D-AR from desensitization.

关键词： angiotensin II α1D-AR α1-AR Expression Rat aorta Smooth Muscle Cells

Key emergency response technologies for abrupt air pollution accidents in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2023年第1期123卷 235-254页

作者： Jun Duan Shushuai Mao Pinhua Xie Jianlei Lang ang Li Jingjing Tong Min Qin Jin Xu zeya Shen Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHFIPSChinese Academy of SciencesHefei 230031China Key Laboratory of Beijing on Regional Air Pollution Control Faculty of Environment and LifeBeijing University of TechnologyBeijing 100124China School of Environmental Science and Optoelectronic Technology University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China Institutes of Physical Science and Information Technology Anhui UniversityHefei 230601China

Abrupt air pollution accidents can endanger people’s health and destroy the local ecological *** appropriate emergency response can minimize the harmful effects of accidents and protect people’s lives and *** paper provides an overview of the key emergency response technologies for abrupt air pollution accidents around the globe with emphasis on the major achievements that China has obtained in recent *** decades of effort,China has made significant progress in emergency monitoring technologies and equipment,source estimation technologies,pollutant dispersion simulation technologies and *** effective domestic emergency monitoring instruments(e.g.,portable DOAS/FT-IR systems,portable FID/PID systems,portable GC-MS systems,scanning imaging remote sensing systems,and emergency monitoring vehicles)had been developed which can meet the demands for routine emergency response activities.A monitoring layout technique combining air dispersion simulation,fuzzy comprehensive evaluation,and a post-optimality analysis was proposed to identify the optimal monitoring layout scheme under the constraints of limited monitoring *** source estimation technologies,including the forward method and the inversion method,have been established and evaluated under various ***-scale dynamic pollution dispersion simulation systems with high temporal and spatial resolution were further developed.A comprehensive emergency response platform integrating database support,source estimation,monitoring schemes,fast monitoring of pollutants,pollution predictions and risk assessment was developed based on the technical idea of"source identification-model simulation-environmental monitoring"dynamic interactive *** is expected that the emergency response capability for abrupt air pollution accidents will gradually improve in China.

关键词： Air pollution accidents Emergency response Emergency monitoring Source estimation Pollutant dispersion simulation

Understanding the structural evolution of Au/WO_(2.7) compounds in hydrogen atmosphere by atomic scale in situ environmental TEM

在线全文

学校读者我要写书评

暂无评论

Nano Research 2020年第11期13卷 3019-3024页

作者： Fei Hui Chong Li Yanhui Chen Chunhui Wang Jingping Huang ang Li Wei Li Jin zou Xiaodong Han Key Lab of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing100124China International Laboratory for Quantum Functional Materials of Henan School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou450001China School of Mechanical and Mining Engineering and Centre for Microscopy and Microanalysis The University of QueenslandSt LuciaQLD4072Australia

Hydrogen energy is a resuscitated clean energy source and its sensitive detection in air is crucial due to its very low explosive *** oxide decorated with noble metal nanoparticles has been used for the enhancement of gas detection and exhibits superior *** the intrinsic mechanism of the detection and the enhancement mechanism is thus becoming a fundamental issue for the further development of novel metal/oxide compound gas-sensing ***,the correlation between the microstructural evolution,the charge transport and the complex sensing process has not yet been directly revealed and its atomic mechanism is still *** this study,an Au/WO_(2.7) compound was synthesized and exhibited a strongly enhanced gas sensitivity to many reductive gases,especially ***-corrected environmental transmission electron microscopy was used to investigate the atomic-scale microstructural evolution in situ during the reaction between H_(2) and Au/WO_(2.7) *** and sintering processes of the Au particles on the WO_(2.7) surface were observed under heating and gaseous environments,and no injection of hydrogen atoms was *** principle calculations verified the swing and sintering processes,and they can be explained by the enhancement of H2 sensitivity.

关键词： in situ environmental TEM H2 sensing Au/WO_(2.7) gas-solid interface

A multiobjective evolutionary optimization method based critical rainfall thresholds for debris flows initiation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain Science 2020年第8期17卷 1860-1873页

作者： YAN Yan z.ang Yu HU Wang GUO Xiao-jun MA Chao Wang zi-ang z.ang Qun Key Laboratory of High-Speed Railway Engineering MOE/School of Civil EngineeringSouthwest Jiao tong UniversityChengdu 610031China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China School of Computer Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Key Laboratory of Mountain Surface Process and Hazards/Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China School of Soil and Water Conservation Beijing Forestry UniversityBeijing 100083China Sichuan Institute of Land and Space Ecological Restoration and Geological Hazard Prevention Chengdu 610081China

At present,most researches on the critical rainfall threshold of debris flow initiation use a linear model obtained through *** relatively weak fault tolerance,this method not only ignores nonlinear effects but also is susceptible to singular noise samples,which makes it difficult to characterize the true quantization relationship of the rainfall ***,the early warning threshold determined by statistical parameters is susceptible to negative samples(samples where no debris flow has occurred),which leads to uncertainty in the reliability of the early warning results by the regression *** overcome the above limitations,this study develops a data-driven multiobjective evolutionary optimization method that combines an artificial neural network(ANN)and a multiobjective evolutionary optimization implemented by particle swarm optimization(PSO).Firstly,the Pareto optimality method is used to represent the nonlinear and conflicting critical thresholds for the rainfall intensity I and the rainfall duration *** ANN is used to construct a dual-target(dual-task)predictive surrogate model,and then a PSO-based multiobjective evolutionary optimization algorithm is applied to train the ANN and stochastically search the trained ANN for obtaining the Pareto front of the I-D surrogate prediction model,which is intended to overcome the limitations of the existing linear regression-based threshold ***,a double early warning curve model that can effectively control the false alarm rate and negative alarm rate of hazard warnings are proposed based on the decision space and target space *** study provides theoretical guidance for the early warning and forecasting of debris flows and has strong applicability.

关键词： Debris flow Critical rainfall thresholds Multiobjective evolutionary optimization Artificial neural network Pareto optimality

Second-harmonic generation using d(33)in periodically poled lithium niobate microdisk resonators

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2020年第3期8卷 311-317页

作者： zHENzHONG HAO LI z.ang WENBO MAO ang GAO XIAOMEI GAO FENG GAO Fang BO GUOQUAN z.ang JINGJUN XU MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300457China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

A fabrication process allowing for the production of periodically poled lithium niobate(PPLN)photonic devices with any domain pattern and unit size down to 200 nm is developed by combining semiconductor fabrication techniques and piezo-force-microscopy tips *** on this fabrication process,PPLN microdisk resonators with quality factors of 8×10~4 were fabricated from a z-cut lithium niobate ***-harmonic generation(SHG)utilizing d(33)in the whole cavity was demonstrated in a PPLN microdisk with a 2μm-spatialperiod radial domain *** SHG conversion efficiency was measured to be 1.44×10^(-5)m W^(-1).This work paves the way to fabricate complex PPLN photonic devices and to obtain efficient nonlinear optical effects that have wide applications in both classical and quantum optics.

关键词： lithium harmonic niobate

Associations between PRF1 Ala91 Val polymorphism and risk of hemophagocytic lymphohistiocytosis: a meta-analysis based on 1366 subjects

在线全文

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2020年第6期16卷 598-606页

作者： Guang-Hua zhu Li-Ping z.ang zhi-Gang Li ang Wei Ying yang Yu Tian Hong-Hao Ma Dong Wang Xiao-Xi zhao Yun-ze zhao Na Li Wei Liu Tian-You Wang Rui z.ang Beijing Children's Hospital.Nanlishi Road No.56 Xicheng DistrictBeijingChina

Background Perforin(PRF1)gene mutation can cause the onset of hemophagocytic lymphohistiocytosis(HLH).It has reported that PRFl Ala91 Val polymorphism was related with HLH *** the meta-analysis,we aim to evaluate the association between PRF1 Ala91 Val polymorphism and HLH *** We accomplished a meta-analysis of six published case-control studies including 391 patients with HLH and 975 *** evaluated the quality of each study through Newcastle-Ottawa Scale(NOS).Data analysis was performed with Stata *** In general,all studies were of high quality(NOS score higher than 7).There were statistically significant between the PRFl Ala91 Val polymorphism and HLH risk though the pooled analysis[for Ala/Val ***/Ala:pooled odds ratio(OR)=3.22,95%confidence interval(Cl)1.08-9.56,P=0.035,random model;for Ala/Val+Val/Val ***/Ala:pooled OR=2.96,95%Cl 1.14-7.69,P=0.025,random model].Furthermore,sensitivity analysis also revealed a relationship between PRFl Ala91Val polymorphism and HLH risk(for Ala/Val ***/Ala:pooled OR=5.236,95%Cl 2.72-10.08,P<0.000,/2=12.1%,^heterogeneity=0-332;for Ala/Val+Val/Val ***/Ala,pooled OR=4.856,95%Cl 2.66-8.85,P<0.000,/2=5.9%,Pheterogeneity=0.373).Funnel plot and Egger’s test did not indicate obvious published bias(P=0.841 for Ala/Val ***/Ala;?=0.284 for Ala/Val+Val/Val ***/Ala).Conclusion This meta-analysis indicated that PRFl Ala91 Val polymorphism affects the factor for developing HLH and future studies of PRFl Ala91 Val on the onset of HLH will be guaranteed.

关键词： Ala91Val polymorphism Hemophagocytic lymphohistiocytosis PRFl

Nitrogen addition amplified water effects on species composition shift and productivity increase

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2021年第5期14卷 816-828页

作者： Xiaolin z.ang Muqier Hasi ang Li Yulian Tan Stefani Daryanto Lixin Wang Xueyao z.ang Shiping Chen Jianhui Huang State Key Laboratory of Vegetation and Environmental Change Institute of Botanythe Chinese Academy of SciencesBeijing 100093China College of Grassland Science Shanxi Agricultural UniversityTdigu 030801China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Departmcnt of Earth Sciences Indiana University Purdue University IndianapolisIndianapolisIN 46202USA

Aims Water and nitrogen(N)are two key resources in dryland ecosystems,but they may have complex interactive effects on the community structure and ecosystem *** future precipitation(rainfall vs snowfall)change will impact aboveground net primary production(ANPP)is far from clear,especially when combined with increasing N *** In this study,we investigated changes in community productivity,abundance and aboveground biomass of two dominant plant functional groups(PFGs),*** rhizome grasses(PR)and perennial bunchgrasses(PB)under the impacts of increased precipitation(rainfall vs snowfall)combined with N addition in a semiarid temperate *** Findings Summer rainfall augmentation marginally increased community ANPP,whereas it significantly increased the abundance and aboveground biomass of PR,but not those of *** rainfall addition increased the fraction of PR biomass(fPR)while decreased that of PB(fPB).Spring snow addition had no effect on aboveground biomass of either compositional PFG although it marginally increased community *** addition significantly increased community ANPP with greater increase in PR under summer rainfall addition,indicating strong interactive effects on community ANPP largely by enhancing PR *** also found a nonlinear increase in the positive effect of nitrogen addition on productivity with the increased precipitation *** findings indicate an amplified impact of precipitation increase on grassland productivity under the accelerated atmospheric N deposition in the future.

关键词： aboveground net primary production community structure temperate steppe nitrogen addition snow and water addition