检索结果-南通市图书馆

ENERGY-LOSS FUNCTIONS DERIVED FROm REELS SPECTRA FOR ALUmINUm

在线全文

学校读者我要写书评

暂无评论

Acta metallurgica Sinica(English Letters) 2005年第3期18卷 217-222页

作者： Z.m.Zhang Z.J.Ding h.m.li K.Salma X.Sun R.Shimizu T.Koshikawa K.Goto StructureResearchLaboratoryandDepartmentofPhysics UniversityofScienceandTechnologyofChinaTheChineseAcademyofSciencesHefei230026China DepartmentofInformationScience OsakaInstituteofTechnologyOsaka573-0196Japan FundamentalElectronicsResearchInstitute OsakaElectro-CommunicationUniversityOsaka572-8530Japan DepartmentofSystemsEngineering NagoyaInstituteofTechnologyNagoya466-8555Japan

The effective energy loss functions for Al have been derived from differential i nverse inelastic mean free path based on the extended Landau approach. It has be en revealed that the effective energy loss function is very close in value to th e theoretical surface energy loss function in the lower energy loss region but g radually approaches the theoretical bulk energy loss function in the higher ener gy loss region. moreover, the intensity corresponding to surface excitation in e ffective energy loss functions decreases with the increase of primary electron e nergy. These facts show that the present effective energy loss function describe s not only surface excitation but also bulk excitation. At last, REELS spectra s imulated by monte Carlo method based on use of the effective energy loss functio ns has reproduced the experimental REELS spectra with considerable success.

关键词： effective energy loss function monte Carlo simulation extended Landau approach reflection electron energy loss spectro scopy Aluminum

Computation of Biobjective/Bidisciplinary Optimization

在线全文

学校读者我要写书评

暂无评论

Computation of Biobjective/Bidisciplinary Optimization

On the Generation of Strong Core Field Inside Flux Rope:2-D mhD and hall mhD Simulation

第十一届全国计算流体力学会议

作者： Z.Q.Zhu h.Y.Fu R.X.Yu h.m.li Beijing University of Aeronautics and Astronautics. Beijing 100083China

1 Introduction It is well known that a modern fighter should have high aerodynamic performance, i.e., highlift (C) and low drag (C), high C/C at subsonic speed and low drag at supersonic speed, ***, stealthy performance has also become one of the basic requirements to a modern fighter. Sothe task of a designer today is to shape the aircraft with not only the maximum aerodynamic efficiencybut also a low observability. Up to now, reducing radar cross section (RCS) is the most importantpart of low observable technique for a flight vehicle. These requirements derive the development ofmultiobjective (mO)/multidisciplinary (mD) optimization. The goal of mO/mD optimization is toobtain one of the needed pareto solution at a minimum computing expense. A computational study ofbiobjective (BO)/bidisciplinary(BD) optimization of airfoils and wings is given in the present paper.

关键词：

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

On the Generation of Strong Core Field Inside Flux Rope:2-D ...

扩散加权mRI鉴别卵巢交界性与恶性上皮性肿瘤:病理对照研究

中国空间科学学会空间物理学专业委员会第十五届全国日地空间物理学研讨会

作者： Y.Pang m.Zhou S.Y.huang X.h.Deng Z.G.Yuan X.J.Xu h.m.li D.D.Wang Institute of Space Science and Technology Nanchang University Institute of Astronomy Nanchang University School of Electronic and Information Wuhan University

2-D mhD and hall mhD simulations are carried out to study the generation of the enhancement of core field inside flux ***,we systemically investigate the growth of core fieldoyB,at the center of the flux rope(the O point),with or without hall *** contrary to previous simulation results[liu et al.,2009],we find that a nonlinear growth ofoyB,is simply due to the interaction between two reconnection jets ejected from two adjacent X lines,rather than the interaction between the hall effect and pre-existed guide *** develop a simple theoretical model to semi-quantitatively describe how such an interaction(between reconnection jets)causes the explosive growth ofoyB,.In addition,we also find that hall magnetic field can directly contributes to the enhancement ofoyB,via"re-reconnection"process in small scale flux rope and will lead to the saturated value ofoyB,slightly higher than those of large ones.

关键词：

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

国际医学放射学杂志 2014年第6期 600-601页

作者： S.h.Zhao J.W.Qiang G.F.Zhang F.h.ma S.Q.Cai h.m.li 成杰 Department of Radiology Jinshan HospitalFudan University

摘要目的探讨mR扩散加权成像(DWI)鉴别卵巢交界性与恶性上皮性肿瘤。方法回顾性研究共纳入48例病人共60个交界性上皮性卵巢肿瘤(BEOT),54例病人共65个

关键词：恶性上皮性肿瘤交界性卵巢性腺扩散加权 mRI

Prospects for a multi-TeV gamma-ray sky survey with the LhAASO water Cherenkov detector array

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2020年第6期44卷 123-132页

作者： F.Aharonian V.Alekseenko Q.An Axikegu L.X.Bai Y.W.Bao D.Bastieri9 X.J.Bi h.Cai Zhe Cao Zhen Cao J.Chang J.F.Chang X.C.Chang S.P.Chao B.m.Chen J.Chen L.Chen L.Chen m.L.Chen m.J.Chen Q.h.Chen S.h.Chen S.Z.Chen T.L.Chen X.L.Chen Y.Chen N.Cheng Y.D.Cheng S.W.Cui X.h.Cui Y.D.Cui B.Z.Dai h.L.Dai Z.G.Dai Danzengluobu B.D'Ettorre Piazzoli J.Fang J.h.Fan Y.Z.Fan C.F Feng L.Feng S.h.Feng Y.L.Feng B.Gao Q.Gao W.Gao m.m.Ge L.S.Geng G.h.Gong Q.B.Gou m.h.Gu Y.Q.Guo Y.Y.Guo Y.A.han h.h.he J.C.he m.heller S.L.he Y.he C.hou D.h.huang Q.L.huang W.h.huang X.T.huang h.B.hu S.hu h.Y.Jia K.Jiang F.Ji C.Jin X.L.Ji K.Levochkin E.W.liang Y.F liang Cheng li Cong li F.li h.li h.B.li h.C.li h.m.li J.li K.li W.L.li X.li X.R.li Y.li Z.li Z.li B.liu C.liu D.liu h.D.liu h.liu J.liu J.Y.liu m.Y.liu R.Y.liu S.m.liu W.liu Y.N.liu Z.X.liu W.J.Long R.Lu h.K.Lv B.Q.ma L.L.ma J.R.mao A.masood X.h.ma W.mitthumsiri T.montaruli Y.C.Nan P.Pattarakijwanich Z.Y.Pei B.Q.Qiao m.Y.Qi D.Ruffolo V.Rulev A.Sáiz L.Shao O.Shchegolev X.D.Sheng J.R.Shi Y.Stenkin V.Stepanov Z.B.Sun P.h.T.Tam Z.B.Tang W.W.Tian D.D.Volpe C.Wang h.Wang h.G.Wang J.C.Wang L.Y.Wang W.Wang W.Wang X.G.Wang X.Y.Wang X.J.Wang Y.D.Wang Y.J.Wang Y.N.Wang Y.P.Wang Z.Wang Z.h.Wang Z.X.Wang D.m.Wei J.J.Wei T.Wen C.Y.Wu h.R.Wu S.Wu W.X.Wu X.F.Wu G.m.Xiang G.Xiao G.G.Xin Y.Xing R.X.Xu L.Xue D.h.Yan C.W.Yang F.F.Yang L.L.Yang m.J.Yang R.Z.Yang S.B.Yang Y.h.Yao Z.G.Yao Y.m.Ye L.Q.Yin N.Yin X.h.You Z.Y.You Q.Yuan Y.h.Yu Z.J.Jiang h.D.Zeng T.X.Zeng W.Zeng Z.K.Zeng m.Zha B.B.Zhang h.m.Zhang h.Y.Zhang J.L.Zhang J.W.Zhang L.Zhang P.F.Zhang P.P.Zhang S.R.Zhang S.S.Zhang X.Zhang X.P.Zhang Yi Zhang Yong Zhang Y.F.g Zhang B.Zhao J.Zhao L.Zhao L.Z.Zhao F.Zheng Y.Zheng J.N.Zhou P.Zhou R.Zhou X.X.Zhou C.G.Zhu F.R.Zhu h.Zhu K.J.Zhu X.Zuo Institute of high Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China TIANFU Cosmic Ray Research Center ChengduShichuanChina University of Science and Technology of China 230026 HefeiAnhuiChina Tsinghua University 100084 BeijingChina National Astronomical Observatories Chinese Academy of Sciences100101 BeijingChina National Space Science Center Chinese Academy of Sciences100190 BeijingChina School of Physics Peking University100871 BeijingChina Center for Astrophysics Guangzhou University510006 GuangzhouGuangdongChina Sun Yat-sen University 519000 ZhuhaiGuangdongChina Shool of Physics and Technology Guangxi University530004 NanningGuangxiChina hebei Normal University 050024 ShijiazhuangHebeiChina School of Physics and Engineering Zhengzhou University450001 ZhengzhouHenanChina Nanjing University 210023 NanjingJiangsuChina Key Laboratory of Dark matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of Sciences210034 NanjingJiangsuChina Institute of Frontier and Interdisciplinary Science Shandong University266237 QingdaoShandongChina Shanghai Astronomical Observatory Chinese Academy of Sciences200030 ShanghaiChina School of Physical Science and Technology Southwest Jiaotong University610031 ChengduSichuanChina Sichuan University 610065 ChengduSichuanChina Key Laboratory of Cosmic Rays(Tibet University) Ministry of Education850000 LhasaTibetChina School of physics and technology Wuhan university430072 WuhanChina Yunnan University 650091 KunmingYunnanChina Yunnan Astronomical Observatories Chinese Academy of Sciences650216 KunmingYunnanChina Institute for Nuclear Research Russian Academy of SciencesMoscowRussia Département de Physique Nucléaire et Corpusculaire Facultéde SciencesUniversitéde GenéveGenevaSwitzerland Department of Physics Faculty of ScienceMahidol UniversityBangkokThailand Dublin Institute for Advanced Studies 31 Fitzwilliam PlaceDublin 2Ireland max-Planc

The Water Cherenkov Detector Array(WCDA) is a major component of the Large high Altitude Air Shower Array Observatory(LhAASO), a new generation cosmic-ray experiment with unprecedented sensitivity, currently under construction. WCDA is aimed at the study of TeV γ-rays. In order to evaluate the prospects of searching for TeV γ-ray sources with WCDA, we present a projection of the one-year sensitivity of WCDA to TeV γ-ray sources from TeVCat using an all-sky approach. Out of 128 TeVCat sources observable by WCDA up to a zenith angle of 45°, we estimate that 42 would be detectable in one year of observations at a median energy of 1 TeV. most of them are Galactic sources, and the extragalactic sources are Active Galactic Nuclei(AGN).

关键词： TeVγ-ray astronomy observational prospect LhAASO-WCDA

Towards high-performance,efficient and sustainable material processing technologies for aerospace applications

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2025年第1期38卷 1-2页

作者： Jun mA m.W.FU Stefania BRUSChI heng li State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Department of mechanical and Industrial Engineering Norwegian University of Science and TechnologyTrondheim 7491Norway Department of mechanical Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Department of Industrial Engineering University of PadovaPadova 35131Italy

The aerospace and aviation industry has long been at the forefront of materials and processing technologies,driven by its ongoing demand for lightweight,highly reliable,and durable *** manufacturing is a critical discipline that directly affects the performance,functionality,and safety of aircraft and aerospace *** meet the above-mentioned stringent requirements,advanced materials and cutting-edge processing technologies have evolved alongside aerospace innovations.

关键词： performance aviation mentioned

mossbauer,optical and structural properties of Fe^(3+) ion in borate glass

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

Journal of Rare Earths 2025年第1期43卷 162-170,I0006页

作者： Essam A.Elkelany hesham Y.Amin A.Samir m.m.EL-hady h.h.El-Bahnasawy moukhtar A.hassan Basic Science Department Faculty of EngineeringSinai UniversityAl-Arish45511Egypt School of Information and Electrical Engineering Hangzhou City UniversityHangzhou30015China State Key Laboratory of modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou310027China Basic Science Department Faculty of Engineering at ShoubraBenha University11629Egypt Physics Department Faculty of ScienceAl-Azhar University11884CairoEgypt

Lanthanum-bearing iron lithium borate glass is a quaternary system for oxide glasses and was prepared via the melt-quenching *** present article correlates the structure,optical,ligand field and m?ssbauer data on iron lithium borate glass co ntaining La^(3+).The density was measured,while the molar volume was *** physical parameters are *** increasing the La_(2)O_(3) content within the glass network,infrared spectra analysis reveals structural modifications such as the increase in BO_(4) units and the decline in both BO_(3) units and NBO bonds ***,optical absorption spectra were *** absorption spectra disclose a plethora of electronic transitions that are related to Fe^(3+)in tetrahedral and octahedral sites,however,Fe^(2+)phase is not observed in optical spectra,but it has a clear signature in m?ssbauer ***,the glass absorption edges undergo a clear blue shift,reflecting an increased band gap energy(1.96-2.28 eV).The decline in NBO bonds justifies this ***,the values of crystal field splitting are increased,while the values of Racah parameters are *** trend is justified by the decline in NBO bonds and increases electron localization around Fe cations.m?ssbauer spectra confirm the existence of Fe^(3+)in tetrahedral and octahedral sites,while Fe^(2+)exists in only a tetrahedral *** increasing La_(2)O_(3) content,the isomer shift of Fe^(3+)in tetrahedral sites changes to be 0.312-0.329 mm/s,while the isomer shift of octahedral Fe^(3+)is 0.424-0.456 mm/*** findings coincide with optical *** the isomer shift of tetrahedral Fe^(2+)is 0.902-0.911 mm/*** results of structural,optical and ligand field associated with m?ssbauer spectra open more vistas toward the utility of these samples in the optics realm.

关键词： Fe3+ions Rare-earth oxide mossbauer spectra ligand field parameters Optical properties

Combining slow-release fertilizer and plastic film mulching reduced the carbon footprint and enhanced maize yield on the Loess Plateau

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2025年第1期147卷 359-369页

作者： Xiaoqing han Pengfei Dang Lechen liao Fangqi Song miaomiao Zhang maoxue Zhang Guoqing li Shuyue Wen Ning Yang Xiping Pan Xiaofan Wang WenWang Xiaoliang Qin Charles O.Joseph Kadambot h.m.Siddique College of Agronomy Key Laboratory of Crop Physi-ecology and Tillage Science in Northwestern Loess PlateauNorthwest A&F UniversityYanglingShaanxi 712100China Department of Crop Sciences and Beekeeping Technology College of Agricultural Sciences and Food Technology University of Dar es SalaamMwalimu Julius Nyerere Mlimani CampusP.O.Box 35091Dar es SalaamTanzania College of life Science Yulin UniversityChongwen Road No.4YulinShaanxi719000China The UWA Institute of Agriculture and School of Agriculture&Environment The University of Western AustraliaPerth WA 6001Australia

Agricultural practices significantly contribute to greenhouse gas(GhG)emissions,necessitating cleaner production technologies to reduce environmental pressure and achieve sustainable maize *** film mulching is commonly used in the Loess Plateau *** slow-release fertilizers as a replacement for urea within this practice can reduce nitrogen losses and enhance crop *** these techniques represents a novel agricultural approach in semi-arid ***,the impact of this integration on soil carbon storage(SOCS),carbon footprint(CF),and economic benefits has received limited research ***,we conducted an eight-year study(2015-2022)in the semi-arid northwestern region to quantify the effects of four treatments[urea supplied without plastic film mulching(CK-U),slow-release fertilizer supplied without plastic film mulching(CK-S),urea supplied with plastic film mulching(Pm-U),and slow-release fertilizer supplied with plastic film mulching(Pm-S)]on soil fertility,economic and environmental *** results revealed that nitrogen fertilizer was the primary contributor to total GhG emissions(≥71.97%).Compared to other treatments,Pm-S increased average grain yield by 12.01%-37.89%,water use efficiency by 9.19%-23.33%,nitrogen accumulation by 27.07%-66.19%,and net return by 6.21%-29.57%.Furthermore,Pm-S decreased CF by 12.87%-44.31%and CF per net return by 14.25%-41.16%.After eight years,Pm-S increased SOCS(0-40 cm)by 2.46%,while Pm-U decreased it by 7.09%.These findings highlight the positive effects of Pm-S on surface soil fertility,economic gains,and environmental benefits in spring maize production on the Loess Plateau,underscoring its potential for widespread adoption and application.

关键词： Plastic film mulching Slow-release fertilizer maize grain yield Carbon footprint Economic benefits

Ti^(3+)/Ti^(4+)and Co^(2+)/Co^(3+)redox couples in Ce-doped Co-Ce/TiO2 for enhancing photothermocatalytic toluene oxidation

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

Journal of Environmental Sciences 2025年第3期149卷 164-176页

作者： Guanghui li Xiaolan li Xinhui hao Qiang li meng Zhang hongpeng Jia Xiamen Key Laboratory of materials for Gaseous Pollutant Control Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China CAS Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China

Cerium and cobalt loaded Co-Ce/TiO_(2)catalyst prepared by impregnation method was investigated for photothermal catalytic toluene *** on catalyst characterizations(XPS,EPR and h2-TPR),redox cycle between Co and TiO_(2)(Co^(2+)+Ti^(4+)↔Co^(3+)+Ti^(3+))results in the formation of Co^(3+),Ti^(3+)and oxygen vacancies,which play important roles in toluene catalytic oxidation *** introduction of Ce brings in the dual redox cycles(Co^(2+)+Ti^(4+)↔Co^(3+)+Ti^(3+),Co^(2+)+Ce4+↔Co^(3+)+Ce3+),further promoting the elevation of reaction sites *** full spectrum irradiation with light intensity of 580mW/cm^(2),Co-Ce/TiO_(2)catalyst achieved 96%of toluene conversion and 73%of CO_(2)yield,obviously higher than Co/P25 and Co/TiO_(2).Co-Ce/TiO_(2)efficiently maintains 10-hour stability test under water vapor conditions and exhibits better photothermal catalytic performance than counterparts under different wavelengths *** catalytic reaction displays improved activities compared with thermal catalysis,which is attributed to the promotional effect of light including photocatalysis and light activation of reactive oxygen species.

关键词： Photothermal catalysis Redox cycle Oxygen vacancy VOCs Titanium dioxide