检索结果-南通市图书馆

Enhancement of comprehensive properties of Nb-Si based in-situ composites by Ho rare earth doping

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第9期43卷 4508-4520页

作者： Wei Wei Qi Wang Rui-Run chen Chao-Wen Zheng Yan-{1. Su National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China

This study examines the microstructure,mechanical properties(with a focus on room-temperature toughness),and oxidation resistance of Ho-doped NbDSi based in-situ *** base alloy consists of the coarse primary Nb_(5)Si_(3.phase and the Nb_(5)Si_(3.+Nbss(Nb solid solution)eutectic *** doping influences the solidification *** the Ho doping is higher than0.2 at%,the alloys transform into eutectic *** can be solid-solved in trace amounts in the Nbss ***,most of Ho forms a stable Ho oxide phase,which alleviates oxygen contamination problem to some ***,the interface separation between Ho oxide and other phases reduces the plastic deformation ***,with 0.4 at%Ho doping,the K_(Q)value is1..03.MPa·m^(1.2),which is 3..1.higher than that of the base *** strength of the Ho-doped alloys does not deteriorate with an increase in ***,the large network-like Ho_(2)O_(3.in the 0.8Ho alloy causes a decrease in toughness and *** addition,the Ho oxide phase effectively blocks the inward oxygen *** 0.8 at%Ho doping,the oxidation mass gain per unit area is 1..1. mg·cm^(2),which is 3..7%lower than that of the base alloy.

关键词： Nb-Si based composites Rare earth elements Ho Microstructure Properties

THE KINETIC STUDIES ON THE PHOTOISOMERIZATION OF 1.2-DISUBSTITUTED ETHYLENES

在线全文

学校读者我要写书评

暂无评论

chinese Chemical Letters 1993年第4期4卷 335-338页

作者： Ling Jiang chenG~(1,2) qing Qi chen~1 Han cheng YUAN~3.Jin Shi MA~1 Bao Zhen YAN~3.Guang Zhi XU~2 1 institute of Photographic Chemistry,chinese academy Of sciences,Beijing 100101 2 institute of Chemistry,chinese academy of sciences,Beijing 100080{13.Department of Applied Chemistry,Beijing institute of Chemical Technology,Beijing 100029

An NMR study on the kinetics of photoisomerization of some important 1.2-disubstituted ethylenes are presented in this study.

关键词： THE KINETIC STUDIES ON THE PHOTOISOMERIZATION OF 1.2-DISUBSTITUTED ETHYLENES than line

Climatic envelope of evergreen sclerophyllous oaks and their present distribution in the eastern Himalaya and Hengduan Mountains

在线全文

学校读者我要写书评

暂无评论

Journal of Systematics and Evolution 2009年第3期47卷 183-190页

作者： 1.2qing-Song YANG 1.en-Yun {1. 1.2Ke XIA 1.he-Kun ZHOU 1.Key Laboratory of Biodiversity and Biogeography, Kunming institute of Botany,{3., Kunming 650204, china) 2(Graduate University of{3., Beijing 1.0049, china) (Graduate University of chinese academy of sciences Beijing 100049 China)

Evergreen sclerophyllous oaks (the E.S. oaks, Quercus section Heterobalanus) are the dominant species of the local ecosystem in the eastern Himalaya and the Hengduan Mountains, southwest china. In this study, we document the climatic envelope of the seven E.S. oak species and examine the relationships between climate and their distribution. This was done using a principal components analysis (PCA) and multiple regression analysis (MRA) of nine climatic indices. The main climatic envelope of the E.S. oaks were: mean temperature of the warmest month (MTW)=1..0-1..5 ℃, warmth index (WI) ={1..2-88.9 ℃ month, annual biotemperature (BT)=-6.9--0.3.℃, coldness index (CI)=-3..4- -1..1.℃ month, mean temperature of the coldest month (MTC)=-3.7-3.0 ℃ and annual precipitation (AP)=701.897 mm at the lower limits; and MTW=8.3.1..1.℃, WI=1..7-59.1.℃ month, BT=3.6-8.9 ℃, CI=-55.4--1..3.℃ month, MTC=8.3.1..1.℃ and AP=61.-81. mm at the upper limits. The climatic range of the E.S. oaks is wide and includes two climatic zones, the cool-temperature zone and the subpolar zone. The PCA and MRA results suggest that the thermal climate plays a major role and precipitation plays a secondary role in controlling the large-scale distribution of the E.S. oaks, except Quercus monimotricha. In thermal regimes, BT and/or MTW are most important for both lower and upper limits of the E.S. oaks. Furthermore, our results indicate that the upper distribution limits of the E.S. oaks are less determined by low temperatures and their duration (CI) than by other factors.

关键词： climatic indices distribution limits multiple regression analysis principal components analysis Quercus section Heterobalanus.

Photothermal properties of Cu@polycarbonate composites with strong localized surface plasmon resonances

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第9期17卷 8513-8520页

作者： Fengyi Wang Jiangling He Junshan Hu Zhihui chen Yumeng Shi {1.-Hua Xu SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Department of Chemistry National University of Singapore3 Science Drive 3Singapore 117543Singapore College of Materials Science and Engineering Sichuan UniversityChengdu 610065China

Copper is relatively low cost and highly abundant compared with the well-studied noble metals such as gold and ***,the poor plasmonic and high susceptibility towards oxidation limit the study of its optical properties and applications as ***,copper nanoparticles@polycarbonate(Cu@PC)composites were prepared by using a facile one-step solvothermal *** Cu@PC composites have strong localized surface plasmon resonances(LSPR)due to that the PC shell can induce the particles to form many-particles system with different particle numbers,which not only lead to overlap and hybridize of the LSPR modes,but also shift the LSPR away from the interband transitions,and the PC layer also prevents the oxidation of Cu *** photothermal conversion efficiency of Cu@PC composites reaches 41.1.under 808 nm continuous wave(CW)laser irradiation which is higher than previously reported Cu nanomaterials that have been ***,the composites also have high photothermal ***,interfacial evaporator is prepared by assembling the Cu@PC composites on scouring sponge as light absorption layer which has>92.8%absorption in entire solar spectrum *** seawater evaporation rate is 3.1.7 kg·m^(-2)·h^(-1.with a E_(evaporator)/E_(water)of *** high evaporation rate interfacial evaporator with low cost,simple,and scalable approach shows great application value in the field of photothermal evaporation.

关键词： Cu nanoparticles localized surface plasmon resonances(LSPR) photothermal interfacial evaporation

Compound extreme inundation risk of coastal wetlands caused by climate change and anthropogenic activities in the Yellow River Delta,china

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

Advances in Climate Change Research 2024年第1期15卷 134-147页

作者： Xiao-Li WANG Ai-qing FENG Xi-Yong HOU qing-chen CHAO Bai-Yuan SONG Yu-Bin {3. Qi-Guang WANG He XU Yu-Xin ZHANG Dong Li Li-Jie DONG Yu GUO CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China Shandong Key Laboratory of Coastal Environmental Processes Yantai 264003China china Meteorological Administration Key Laboratory for Climate Prediction Studies National Climate CentreBeijing 100081China Tongji Urban Planning Design Research institute Shanghai 200092China School of Geography and Tourism Qilu Normal UniversityJinan 250200China china Meteorological Administration Training Centre China Meteorological AdministrationBeijing 10008China University of chinese academy of sciences Beijing 100049China Marine Science and Technology College Zhejiang Ocean UniversityZhoushan 316022China

The coastal wetlands of the Yellow River Delta(YRD)in china are crucial for their valuable resources,environmental significance,and economic ***,these wetlands are also vulnerable to the dual threats of climate change and human *** substantial attention to the historical shifts in YRD's coastal wetlands,uncertainties remain regarding their future trajectory in the face of compound risks from climate change and anthropogenic *** on a range of remote sensing data sources,this study undertakes a comprehensive investigation into the evolution of YRD's coastal wetlands between 2000 and ***,the potential fate of coastal wetlands is thoroughly analyzed through the Land Use/Cover Change(LUCC)simulation using System Dynamic-Future Land Use Simulation(SD-FLUS)model and the extreme water levels projection integrated future sea-level rise,storm surge,and astronomical high tide in 203.,2050,and 2100 under scenarios of SSP1-2.6,SSP2-4.5,and *** revealed that YRD's coastal wetlands underwent a marked reduction,shrinking by 1688.72 km²from 2000 to *** decline was mostly attributed to the substantial expansion in the areas of artificial wetlands(increasing by 823.78 km2),construction land(increasing by 767.71 km²),and shallow water(increasing by 274.58 km²).Looking ahead to 203.-2100,the fate of coastal wetlands appears to diverge based on different *** the SSP1-2.6 scenario,the area of coastal wetland is projected to experience considerable *** contrast,the SSP5-8.5 scenario anticipates a notable decrease in coastal *** to the inundated area suffered from the current extreme water levels,the study projects a decrease of 6.8%-10.6%in submerged coastal wetlands by 203. and 9.4%-18.2%by 2050 across all *** 2100,these percentages are projected to decrease by 0.4%(SSP2-4.5)and 27.1%(SSP5-8.5),but increase by 3..7%(SSP1-2.6).Results suggest that coastal wetlands in th

关键词： Climate change Anthropogenic activities Compound extreme risk Coastal wetlands Yellow River Delta

Mechanical and Experimental Study of Sprinkling Water Cooling System on Roof of Shanghai Expo Theme Pavilion

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

湖南大学学报（自然科学版） 2009年第S1期36卷 156-159页

作者： ZHAO Hui-zhong1.HUANG chen1.LI Wei-xiang2,SHI Jin-yue2,TAO Si-yuan1.WANG Qian1.WANG Yu-{1.1.ZHANG Min3.1.College of Urban Construction and Environment Engineering,University of Shanghai for Science and Technology,Shanghai 200093.{3. 2.Architectural Design & Research institute of Tongji University,Shanghai 200092,{3. 3.College of Food Science Technology,Shanghai Ocean University,Shanghai 201.2}6,{3.) College of Urban Construction and Environment Engineering University of Shanghai for Science and Technology Shanghai 200093 China Architectural Design and Research institute Tongji University Shanghai 200092 China College of Food Science Technology Shanghai Ocean University Shanghai 201306 China

Based on the similarity theory,a scale effect model of the spraying water cooling system of Shanghai expo Theme Pavilion's roof was set *** to the typical weather conditions in Shanghai city,different models were analyzed on solar radiation,and different heat transfer amount was *** the following conclusions could be made:At the sunny day of summer in Shanghai,the temperature of inner roof with sprinkling system descended about 3.℃,and the air conditioning load of the whole Theme Pavilion descend more than 3.0 kW.

关键词： Shanghai expo large space atrium solar radiation roof sprinkling system similarity theory prototype

兔植入前移核胚中发育相关基因的差异表达分析

在线全文

学校读者我要写书评

暂无评论

生物化学与生物物理进展 2003年第5期30卷 813-818页

作者：李文雍齐冰王玉阁郁卫东杜淼陈清轩中国科学院遗传与发育生物学研究所

与早期胚胎发育相关的一些重要基因异常表达致使克隆胚细胞核的再程序化过程受阻,是导致动物克隆失败的重要原因.为了分离鉴定再程序化相关基因,我们改进了mRNA差异显示技术,成功地建立了单胚差示技术体系.以不同发育时期的兔克隆胚(M... 详细信息

与早期胚胎发育相关的一些重要基因异常表达致使克隆胚细胞核的再程序化过程受阻,是导致动物克隆失败的重要原因.为了分离鉴定再程序化相关基因,我们改进了mRNA差异显示技术,成功地建立了单胚差示技术体系.以不同发育时期的兔克隆胚(MⅡ卵、2细胞、4细胞、8～ 1.细胞克隆胚胎)为材料进行单胚差示,分离了 80个差异片段.经反向RNA印迹验证、亚克隆、序列分析及NCBIGenBank数据库检索,结果表明:A0 2 8片段与CstF{1.因有 9{1.的同源性,在早期胚胎发育过程中的表达有阶段特异性,该基因在兔克隆胚的早期发育过程中起重要作用.RNA印迹显示:该基因在所检测的组织中,只在卵巢中有表达.

关键词：差异表达分析发育相关基因兔克隆胚胎再程序化单胚差异显示技术

A compact multi-pixel superconducting nanowire single-photon detector array supporting gigabit space-to-ground communications

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第2期13卷 254-266页

作者： Hao Hao qing-Yuan Zhao Yang-Hui Huang Jie Deng Fan Yang Sai-Ying Ru Zhen {1. Chao Wan Hao {1. Zhi-Jian Li Hua-Bing Wang Xue-Cou Tu La-Bao Zhang Xiao-qing Jia Xing-Long Wu Jian chen Lin Kang Pei-Heng Wu Research institute of Superconductor Electronics(RISE) School of Electronic Science and EngineeringNanjing UniversityNanjingJiangsu 210023China Purple Mountain Laboratories NanjingJiangsu 211111China Hefei National Laboratory HefeiAnhui 230088China National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing 210023China

Classical and quantum space-to-ground communications necessitate highly sensitive receivers capable of extracting information from modulated photons to extend the communication distance from near-earth orbits to deep space *** achieve gigabit data rates while mitigating strong background noise photons and beam drift in a highly attenuated free-space channel,a comprehensive design of a multi-functional detector is *** this study,we present an innovative compact multi-pixel superconducting nanowire single-photon detector array that integrates near-unity detection efficiency(91.6%),high photon counting rate(1.61.Gcps),large dynamic range for resolving different photon numbers(1.24),and four-quadrant position sensing function all within one ***,we have constructed a communication testbed to validate the advantages offered by such an *** 8-PPM(pulse position modulation)format communication experiments,we have achieved an impressive maximum data rate of 1.5 Gbps,demonstrating sensitivities surpassing previous benchmarks at respective *** incorporating photon number information into error correction codes,the receiver can tolerate maximum background noise levels equivalent to 0.8 photons/slot at a data rate of 1.0 Mbps—showcasing a great potential for daylight operation ***,preliminary beam tracking tests were conducted through open-loop scanning techniques,which revealed clear quantitative dependence indicating sensitivity variations based on beam *** on the device characterizations and communication results,we anticipate that this device architecture,along with its corresponding signal processing and coding techniques,will be applicable in future space-to-ground communication tasks.

关键词： photon supporting correction

Research of Osteo-induced Rat Mesenchymal Stem Cells Seeding onβ-TCP/PLLA Porous Composite

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

生物医学工程学杂志 2005年第S1期22卷 141-142页

作者： Qiao-Feng WU~1.Yan-Juan TANG~1.Huai-qing {1.~(1.) Jiang WU~1.Guang-Fu YIN~21.institute of Biomedical Engineering, West {3. Medical Center of sichuan University, {1.du 61004.,{3.)2(institute of Material Science and Engineering, sichuan University, {1.du 61.065,{3.) institute of Biomedical Engineering West China Medical Center of Sichuan University Chendu 610041 China institute of Material Science and Engineering Sichuan University Chendu 610065 China

1.IntroductionPorous biodegradable synthetic materials such as β-tricalcium phosphate (β-TCP) and poly L-lactic acid(PLLA) are usually used in bone tissue ***, proper ratio, optimum pore size and porosity of the composites of β-TCP/PLLA are not very clear yet. In this study, we chose osteo-induced rat bone mesenchymal stem cells (rMSCs) as seeding cells, and cultured them on β-TCP/ PLLA scaffolds with different ratio, different pore size and different porosity. The aim is to investigate the optimum construction for supporting cell growth, proliferation and differentiation.

关键词： PLLA Cell MSCs TCP/PLLA Porous Composite Research of Osteo-induced Rat Mesenchymal Stem Cells Seeding on