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Search Results: 1 - 10 of 23361 matches for " Shiyu HE "
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The Impact of Policy Intervention on Regional Economic Growth in China  [PDF]
Lidan Yu, Shiyu Shang
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.912137
Abstract: As a grand policy of realizing the rapid development of the western region and narrowing the income gap between the western region and the eastern and central regions after China’s reform and opening up, it is of great practical significance to objectively study its policy effects. This paper uses the data of municipal districts in Chinese cities from 1997 to 2014 in China City Statistical Yearbook to evaluate the policy effect of the western development strategy by using the method of difference-in-difference propensity score matching (PSM-DID). The research results show that the western development policy has not improved the economic growth of the western region, but has negatively affected the economic growth of the western region. In addition, economic growth in the western region may be due to factors such as fixed asset investment, foreign direct investment, and higher education levels, etc. Therefore, the strategic direction of the development of the western region should focus on human capital investment, improve the market economy system, and strengthen exchanges and cooperation between regions in the future.
Thermoluminescence and thermally stimulated current of methyl silicone rubber induced by proton radiation
质子辐照甲基硅橡胶的热释光和热释电研究

ZHANG Lixin XU Zhou HE Shiyu,
张丽新
,徐洲,何世禹

材料研究学报 , 2004,
Abstract: 用空间辐照环境模拟设备对甲基硅橡胶进行了质子辐照.辐照能量为200keV,辐照剂量范围为1014~1016cm-2.用热发光和热激电流分析方法,研究了硅橡胶质子辐照前后载流子陷阱能级△E及载流子类型的变化规律结果表明:当辐照剂量小于1015cm-2时,△E下降;当辐照剂量超过1015cm-2后,△E上升硅橡胶原始样品中主要载流子类型是电子型.当质子辐照剂量超过5×1014cm-2后,主要载流子类型转变为空穴型.辐照剂量继续增加,载流子类型又有向电子型转变的趋势.
TENSILE PROPERTIES AND MICROSTRUCTURE OF AGED Ti-6Al-4V ALLOY SUBJECTED TO CYCLIC TEMPERATURE FIELD
循环温度场作用下时效态TC4合金的拉伸性能及组织

GENG Hongbin,HE Shiyu,LEI Tingquan,
耿洪滨
,何世禹,雷廷权

材料研究学报 , 1997,
Abstract: The thermal cycling tests between 77 and 623K were performed on the aged Ti-6Al-4V alloy and the tensile properties before and after thermal cycling were evaluated. The results show that the strength of the near-peak-aged alloy decreases and that of the over-aged changes little after 1000 thermal cycles. The ductility decreases and the dislocation density or amount of deformation twins and stacking faulty in the alloy increase after thermal cycling. The dominantly activated slip systems by thermal stress in 2 are {O110}2110], and the activated twins are{1011}.
IN SITU OBSERVATION OF THERMAL FATIGUE CRACK GROWTH IN 3Cr2W8V STEEL
3Cr2W8V钢热疲劳裂纹长大方式的原位观察

LIU Jianhong,HE Shiyu,YAO Mei,
刘剑虹
,何世禹,姚枚

金属学报 , 1992,
Abstract: The growing process of thermal fatigue cracking in 3Cr2W8V steel was observed under desk SEM fitted with self-made minisized device for thermal fatigue test. Before growing of thermal fatigue crack, the main crack tip reveals to blunt firstly, and some holes and uncontinuous microcracks occur in front of it. The growth is developed by bridging of main crack together with holes and microcracks.
THERMAL FATIGUE CRACKING IN STEEL 5CrMnMo
HE Shiyu LI Ying LIU Jianhong Harbin Institute of Technology,Harbin,China HE Shiyu,Faculty of Metal,Harbin Institute of Technology,Harbin,China,
HE Shiyu LI Ying LIU Jianhong Harbin Institute of Technology
,Harbin,China HE Shiyu,Faculty of Metal,Harbin Institute of Technology,Harbin,China

金属学报(英文版) , 1991,
Abstract: The thermal fatigue behaviour of steel 5CrMnMo after various heat treatments has been examined by means of Coffin-model and self-strained thermal fatigue testing machines.The thermal fatigue crack initiation and propagation have been observed under SEM and TEM. The majority of thermal fatigue cracks of the quenched samples initiated firstly at the grain boundaries and that of the quenched-tempered samples at the breakage interface of the car- bide and matrix.The thermal fatigue cracks of either quenched or quenched-tempered steel propagated mainly along the breakage interface of carbide and grain boundaries.
Damage Effect of Space Proton Irradiation with the Low Energy of 50~200 keV on Methyl Silicone Rubber
Damage Effect of Space Proton Irradiation with the Low Energy of 50-200 keV on Methyl Silicone Rubber

Lixin ZHANG,Chengmin WANG,Shiyu HE,
Lixin ZHANG
,Chengmin WANG and Shiyu HELaboratory of Space Materials and Environment Engineering,Harbin Institute of Technology,Harbin,ChinaElectric Engineering

材料科学技术学报 , 2004,
Abstract: The damage effects and mechanisms of proton irradiation with 50~200 keV energy to space-grade methyl silicone rubber was performed using a ground-based simulator for space irradiation environment. The changes in surface morphology, mechanical properties, cross-linking density, glass temperature, infrared attenuated total reflection spectrum, mass spectrum and pyrolysis gas chromatography-mass spectrum indicated that, under lower energy, the proton irradiation would induce cross-linking effect, resulting in an increase in tensile strengths and hardness of the methyl silicon rubber. However, after the irradiation of protons for more than 150 keV, the irradiation induced degradation,which decreased the tensile strengths and hardness, became a dominant effect. A macromolecular network destruction model for the silicone rubber radiated with the protons was proposed.
The thermal and electrical properties of the promising semiconductor MXene Hf2CO2
Xian-Hu Zha,Qing Huang,Jian He,Heming He,Junyi Zhai,Yue Wu,Joseph S. Francisco,Shiyu Du
Physics , 2015,
Abstract: In this work, we investigate the thermal and electrical properties of oxygen-functionalized M2CO2 (M = Ti, Zr, Hf) MXenes using first-principles calculations. Hf2CO2 is found to exhibit a thermal conductivity better than MoS2 and phosphorene. The room temperature thermal conductivity along the armchair direction is determined to be 86.25-131.2 Wm-1K-1 with a flake length of 5-100 um, and the corresponding value in the zigzag direction is approximately 42% of that in the armchair direction. Other important thermal properties of M2CO2 are also considered, including their specific heat and thermal expansion coefficients. The theoretical room temperature thermal expansion coefficient of Hf2CO2 is 6.094x10-6 K-1, which is lower than that of most metals. Moreover, Hf2CO2 is determined to be a semiconductor with a band gap of 1.657 eV and to have high and anisotropic carrier mobility. At room temperature, the Hf2CO2 hole mobility in the armchair direction (in the zigzag direction) is determined to be as high as 13.5x103 cm2V-1s-1 (17.6x103 cm2V-1s-1), which is comparable to that of phosphorene. Broader utilization of Hf2CO2 as a material for nanoelectronics is likely because of its moderate band gap, satisfactory thermal conductivity, low thermal expansion coefficient, and excellent carrier mobility. The corresponding thermal and electrical properties of Ti2CO2 and Zr2CO2 are also provided here for comparison. Notably, Ti2CO2 presents relatively low thermal conductivity and much higher carrier mobility than Hf2CO2, which is an indication that Ti2CO2 may be used as an efficient thermoelectric material.
Microstructural Evolution and Thermal Stability of Ultra-fine Grained Al-4Mg Alloy by Equal Channel Angular Pressing
Hongbin GENG,Subbong KANG,Shiyu HE,
Hongbin GENG
,Subbong KANG,Shiyu HE School of Materials Science and Engineering,Harbin Institute of Technology Harbin,China Korea Institute of Machinery and Materials,Sangnam Dong,Changwon,Kyungnam -,South Korea

材料科学技术学报 , 2004,
Abstract: Experiments were conducted to evaluate the grain refinement and thermal stability of ultra-fine grained Al-4Mg alloy introduced by equal-channel angular pressing (ECAP) at 473 K. The results show that the intensities of X-ray (111/222) and (200/400) peaks for the alloy processed by ECAP decrease significantly and the peak widths of half height become broadening compared with the corresponding value in the annealed alloy. The microstructure of 2 passes ECAPed alloy consists of both elongated and equiaxed subgrains. The residual strain in the alloy increases with increasing passes numbers, that appears as increasing dislocation density and lattice constant of matrix. An equiaxed ultra-fine grained structure of ~0.2μm is obtained in the present alloy after 8 passes. The ultra-fine grains are stable below 523 K, because the alloy retains extremely fine grain size of ~1μm after static annealing at 523 K for1 h.
Thermo-mechanical fatigue behavior of nickel-base powder metallurgy superalloy FGH96 under tension-tension loading

Yuli GU,Yuhuai HE,Shiyu QU,Guodong ZHANG,Fei ZHENG,Chunhu TAO Beijing Institute of Aeronautical Materials,Beijing,China,

金属学报(英文版) , 2010,
Abstract:
Diagnostic Study of Apparent Heat Sources and Moisture Sinks in the South China Sea and Its Adjacent Areas during the Onset of 1998 SCS Monsoon
Diagnostic Study of Apparent Heat Sources and Moisture Sinks in the South China Sea and its Adjacent Areas during the Onset of 1998 SCS Monsoon

Wang Shiyu,QianYongfu,
Wang Shiyu
,QianYongfu

大气科学进展 , 2000,
Abstract: The apparent heat sources (< Q1 >) and moisture sinks (< Q2 >) are calculated based on the reanalyzed data of the South China Sea Monsoon Experiment (SCSMEX) from May 1 to August 31, 1998. It is found that the formation and distribution of the atmospheric heat sources are important for the monsoon onset. The earlier onset of the SCS monsoon is the result of enduring atmospheric heating in the Indo-China Pe-ninsula and South China areas. The atmospheric heating firstly appears in the Indo-China Peninsula area and the sensible heat is the major one. The 30-50 day periodic oscillation of atmospheric heat sources be-tween the SCS area and the western Pacific warm pool has a reverse phase distribution before the middle of July and the low frequency oscillation of heat sources in SCS area has an obvious longitudinal propagation. The 30-50 day low frequency oscillation has vital modificatory effects on the summer monsoon evolution during 1998.
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