检索结果-南通市图书馆

Effect of Wafer Size on the Film Internal Stress Measurement by Wafer Curvature Method

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2016年第1期31卷 93-99页

作者：江帆 chen shang 冷永祥 HUANG Nan Key Laboratory of Advanced Technologies of Materials Ministry of Education School of Materials Science and Engineering Southwest Jiaotong University Chengdu 610031 China National Key Laboratory for Surface Physics and Chemistry Mianyang 621907 China

Wafer curvature method has been applied to determine the internal stress in the films using Stoney＇s *** the film deposition,the wafer fixation on the sample holder will restrict the deformation of the rectangle-shaped wafer,which may result in the stress datum difference along length and width *** this paper,the effect of wafer size and the wafer fixation on the TiN film internal stress measured by wafer curvature method was *** rectangle-shaped wafers with different length/width ratios（L/W=1：1,2：1,3：1 and 4：1） were fixed as a cantilever *** the TiN films deposition,the profiles of the film/wafer were measured using a stylus profilometer and then the internal stress was calculated using the Stoney equation in the *** results showed that the fixed end of the wafers limited to some degree the curvature of the wafers along the width *** film internal stress measured by wafer curvature method,the wafer profile should be scanned along the length direction and the scan distance should be greater than or equal to half of wafer *** the length/width ratio of the wafer reached 3：1,the wafer curvature and the calculated stress were basically the same at different positions along the length *** film internal stress measured by wafer curvature method,it was recommended that the length/width ratio of wafer should be considered to be greater than or equal to 3：1,and the deformed profile was scanned along the length direction.

关键词： film internal stress wafer curvature method wafer size wafer fixation

Synthesis and characterization of Li_(1.3)Al_(0.3)Ti_(1.7)(PO_4)_3-coated LiMn_2O_4 by wet chemical route

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2009年第2期28卷 122-126页

作者： Wu Xianming Li Runxiu chen shang He Zeqiang Jishou Univ Coll Chem & Chem Engn Jishou 416000 Peoples R China

Li1.3Al0.3Ti1.7(PO4)3-coated LiMn2O4 was prepared by wet chemical route. The phase,surface morphology,and electrochemical properties of the prepared powders were characterized by X-ray diffraction,scanning electron micrograph,and galvanostatic charge-discharge experiments. Li1.3Al0.3Ti1.7(PO4)3-coated LiMn2O4 has similar X-ray diffraction patterns as LiMn2O4. The corner and border of Li1.3Al0.3Ti1.7(PO4)3-coated LiMn2O4 particles are not as clear as the uncoated one. The two powders show similar values of l...

关键词： lithium ion battery coating electrochemistry solid state electrolyte intercalation compounds

Optimization of Operation Strategies for a Combined Cooling, Heating and Power System based on Adiabatic Compressed Air Energy Storage

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2020年第5期29卷 1135-1148页

作者： chen shang ZHU Tong GAN Zhongxue ZHU Xiaojun LIU Liuchen School of Mechanical and Energy Engineering Tongji UniversityShanghai 201804China ENN Science and Technology Development Co. Ltd.Langfang 065000China

The fluctuations of renewable energy and various energy demands are crucial issues for the optimal design and operation of combined cooling,heating and power(CCHP)*** this paper,a novel CCHP system is simulated with advanced adiabatic compressed air energy storage(AA-CAES)technology as a join to connect with wind energy generation and an internal-combustion engine(ICE).The capital cost of utilities,energy cost,environmental protection cost and primary energy savings ratio(P E S R)are used as system performance *** fulfill the cooling,heating and power requirements of a district and consider the thermal-electric coupling of ICE and AA-CAES in CCHP system,three operation strategies are established to schedule the dispatch of AA-CAES and ICE:ICE priority operation strategy,CAES priority operation strategy and simultaneous operation *** strategy leads the operation load of AA-CAES or ICE to improve the energy supply efficiency of the ***,to minimize comprehensive costs and maximize the P E S R,a novel optimization algorithm based on intelligent updating multi-objective differential evolution(MODE)is proposed to solve the optimization *** the multi-interface characteristic and active management ability of the ICE and AA-CAES,the economic benefits and energy efficiency of the three operation strategies are compared by the simulation with the same system *** a typical summer day,the simultaneous strategy is the best solution as the total cost is 3643 USD and the P E S R is 66.1%,while on a typical winter day,the ICE priority strategy is the best solution as the total cost is 4529 USD and the P E S R is 64.4%.The proposed methodology provides the CCHP based AA-CAES system with a better optimized operation.

关键词： combined cooling heating and power(CCHP)system advanced adiabatic compressed air energy storage(AA-CAES) optimization

An enhanced influence of sea surface temperature in the tropical northern Atlantic on the following winter ENSO since the early 1980s

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2017年第2期10卷 175-182页

作者： chen shang-Feng WU Renguang Center for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China

Previous studies have revealed a connection between springtime sea surface temperature （SST） in the tropical northern Atlantic （TNA） and the succeeding wintertime El Nino-Southern Oscillation （ENSO）. The present analysis demonstrates that the linkage between springtime TNA SST and the following ENSO experiences an obvious interdecadal change around the early 1980s, with the connection being weak before but significant after. After the early 1980s, springtime positive TNA SST anomalies induce an anomalous cyclone over the northeastern subtropical Pacific and an anomalous Walker circulation with a descending branch over the tropical central-eastern Pacific. This leads to anomalous cold SST in the northeastern Pacific and an anomalous anticyclone over the western-central tropical Pacific, with anomalous easterlies to the equatorward side. As such, springtime TNA SST anomalies are followed by wintertime ENSO after the early 1980s. In contrast, before the early 1980s, anomalous cold SST in the northeastern Pacific and related anomalous easterlies over the western-central tropical Pacific are weak, corresponding to springtime positive TNA SST anomalies and resulting in a weak linkage between springtimeTNA SST and the succeeding wintertime ENSO. Further investigation implies that the change in the TNA SST-ENSO relationship is probably due to a change in springtime mean precipitation over the tropical Atlantic and South America.

关键词： Tropical northern Atlantic ENSO interdecadal change mean precipitation

Failure Mechanism and Material Requirements for Coal Lance in Blast Furnace

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2012年第4期19卷 11-16页

作者： XIONG Wei JIA Juan chen Jia-chao shang He-ming Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and Technology Wuhan 430081 Hubei China

Pulverized coal injection（PCI） is a key technology in modern ironmaking by blast furnace（BF） and the life of injection lance has a great influence on PCI operation and on normal running of blast *** is found that the main reasons for the failure of the lances are their outer surface oxidation and the inner surface erosion through monitoring some lances used in *** outer surface oxidation of the lances made of lCr18Ni9Ti is inevitable under high hot blast temperature condition through thermodynamics analysis.A mathematical model for calculating the temperature of common monocular coal lance had been developed according to the principles of mass and energy *** temperature and flow velocity of the hot blast would cause a rise in the lance *** influence of hot blast temperature is more *** lance temperature would decline when compressed air flux *** technology of dense phase pulverized coal is beneficial to extending lance’s life because decreasing solid-gas ratio would intensify erosion and burning *** anti-oxidation temperature of lance materials needs to be over 1000 ℃ for BF intensified *** order to increase the resistance to oxidation of the coal lance’s outer surface,oxidation-resistant steel or Al coating stainless steel is the appropriate material for BF *** the metal surface treatment technology to enhance the hardness of the coal lance’s internal surface could prolong the service life of coal lance

关键词： blast furnace coal lance failure mechanism material requirements

On the Relationship between the Northern Limit of Southerly Wind and Summer Precipitation over East China

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2015年第1期8卷 52-56页

作者： MEI Shuang-Li chen Wen chen shang-Feng Center for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

The relationship between the summer northernmost position of southerly wind and precipitation over East China is investigated. The northern limit of summer southerly wind index(INLSSW) over East China is defined as the latitude where the zonal-averaged(105–120°E)low-level meridional wind is equal to zero. Results show that there is a significant negative(positive) correlation between INLSSW and summer precipitation over the Yangtze River(North China) region. Thus, the proposed INLSSW may have implications for the prediction of summer precipitation anomalies in these regions. In positive INLSSW years, a cyclonic circulation anomaly is observed over the tropical western North Pacific and an anticyclonic circulation anomaly is seen over the subtropics of East China,accompanied by southerly anomalies over East *** leads to above-normal moisture penetrating into the northern part of East China. In addition, significant upward(downward) motion anomalies can be found over the North China(Yangtze River) region. As a result, there are significant positive(negative) precipitation anomalies over the North China(Yangtze River) region. Further examination shows that sea surface temperature anomalies over the tropical eastern Pacific and Indian Ocean both contribute to the formation of INLSSW-related circulation anomalies over the tropical western North Pacific.

关键词： northern limit of southerly wind precipitation Yan

Has the regional Hadley circulation over western Pacific during boreal winter been strengthening in recent decades?

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2018年第6期11卷 454-463页

作者： HUANG Ru-Ping chen shang-Feng chen Wen HU Peng Center for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Sciences College of Earth Sciences University of Chinese Academy of Sciences

Previous studies suggest a robust intensification of the zonally averaged hadley circulation(HC)during boreal winter in recent decades,but little is known regarding the regional *** study investigates long-term trends of the winter regional HC over the western pacific(WPHC)since 1979 using six reanalysis *** is found that there are large discrepancies in the long-term trends of WPHC intensity among the six ***,three of the six reanalyses(erainterim,20CR and CFSR)show no discernible long-term trends,whereas NCEP-1,NCEP-2 and JRA-55 display pronounced intensification *** in this study suggest that,although the warming trend of SST in the western tropical pacific identified in previous studies is robust,uncertainty remains regarding the long-term trends in the WPHC *** raises a question about the factors involved in changes of the WPHC intensity.

关键词： Regional Hadley circulation western Pacific long-term trend

Inducible overexpression of porcine homeobox A10 in the endometrium of transgenic mice

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2016年第6期15卷 1338-1344页

作者： LIN Rui-yi WU Di ZHAO Chang-zhi chen shang-shang XIAO Qian LI Xin-yun ZHAO Shu-hong Key Lab of Agricultural Animal Genetics Breeding and Reproduction Ministry of Education/The Cooperative Innovation Center for Sustainable Pig Production Huazhong Agricultural University Wuhan 430070 P.R China College of Animal Science and Technology Northeast Agricultural University Harbin 150030 P.R.China

Homeobox A10 （HOXA 10） is a well-known transcription factor that plays an important role in directing endometrial differ- entiation and establishing the conditions required for implantation. Interestingly, the expression level of HOXAIO may be associated with litter size. To study the effects of the porcine HOXAIO promoter fragment on the expression of HOXAIO gene in vivo, we generated a transgenic mouse model using pronuclear microinjection, and measured the expression of HOXAIO in the endometrium. There was no difference in the expression level of HOXAIO between transgenic and wild- type mice in the absence of hormone stimulation. However, following treatment with progesterone and estradiol benzoate, the expression level of HOXAIO was significantly increased in transgenic mice compared with that of wild-type mice. Fur- thermore, the litter size of transgenic females was larger than that of wild-type females （7.02±1.73 vs. 6.48＋1.85; P=0.14）. Moreover, the difference of litter size was greater in the later parities （7.33±1.62 vs. 6.37±2.02; P=0.08） compared with the first parity （6.76±1.81 vs. 6.61v1.67; P=0.77） between transgenic and wild-type mice. Therefore, our transgenic mouse model provides exciting insights regarding the actions of HOXAIO and its hormone-inducible promoter in vivo. The present study offers valuable proof of principle to develop transgenic pigs with a hormone-inducible promoter regulating HOXAIO to alter litter size.

关键词： porcine HOXA 10 transgenic mice endometrium

The Effect of Atomic Vacancies and Grain Boundaries on Mechanical Properties of GaN Nanowires

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第6期28卷 214-217页

作者： XIE Shi-Feng chen shang-Da SOH Ai-Kah Faculty of Materials Optoelectronics and PhysicsXiangtan UniversityHunan 411105 Department of Mechanical Engineering The University of Hong KongPokfulam RoadHong KongChina

Molecular dynamics simulations are carried out to investigate the influences of various defects on mechanical properties of wurtzite GaN nanowires by adopting the empirical Stillinger-Weber *** types of vacancies and grain boundaries are considered and the uniaxial loading condition is implemented along the[001]*** is found that surface defects have less impact on Young's moduli and critical stresses of GaN nanowires compared with random *** grain boundary normal to the axial direction of a nanowire would not significantly affect Young's moduli of ***,the inversion domain grain boundaries with and without wrong bonds would significantly lower Young's moduli of GaN *** addition,the inversion domain grain boundary affects the critical stress of GaN nanowires more than the grain boundary with interface normal to the axial direction of the nanowire.

关键词： nanowires grain boundary