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Conditional mean convergence theorems of conditionally dependent random variables under conditions of integrability

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Frontiers of Mathematics in China 2015年第3期10卷 681-696页

作者： Xinghui wang shuhe HU Department of Statistics Anhui University Hefei 230601 China

We give the conditionally residual h-integrability with exponent r for an array of random variables and establish the conditional mean convergence of conditionally negatively quadrant dependent and conditionally negat... 详细信息

关键词： Conditional negatively quadrant dependent (NQD) random variable conditional negatively associated (NA) random variable conditional mean convergence conditionally residual h-integrability

High Temperature Creep and Fracture Behavior of a Directionally Solidified Ni-base Superalloy

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Journal of Materials Science & Technology 1998年第3期14卷 219-225页

作者： Yuan, Chao Guo, Jianting wang, shuhe Yang, Hongcai Acad Sinica Inst Met Res Shenyang 110015 Peoples R China Northeastern Univ Dept Mat Sci & Engn Shenyang 110006 Peoples R China

The tensile creep-fracture properties of DZ17G, a directionally solidified superalloy, were investigated at 830-900 degree C. The results show that all of the creep curves exhibit negligible primary creep, relatively little steady-state creep and dominant tertiary creep stage. The higher apparent activation energy for creep (540 kJ/mol) suggests that the creep is controlled by Orowan bowing process. A large ratio of the fracture time to the onset time of tertiary creep is the consequence of microstructure change, i.e., gamma ' particles oriented coarsening parallel to the applied stress axis. The creep fracture data follow the Monkman-Grant relationship. The transgranular fracture mechanism proposed on the basis of the metallographic examinations is the linkage of the creep cracks which initiate at the discontinuities with the microstructure (such as the cast porosity, and the carbide/matrix interface) and also at the specimen surface, that propagate along the gamma / gamma ' interface with perpendicular to the applied stress axis, and the process of crack propagation can be described by the Tien model. (Edited author abstract) 31 Refs.

关键词： Nickel alloys

CD103+ lung dendritic cells(LDCs)induce stronger Th1/Th17 immunity to a bacterial lung infection than CD11b^(hi) LDCs

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Cellular & Molecular Immunology 2018年第4期15卷 377-387页

作者： Sudhanshu Shekhar Ying Peng shuhe wang Xi Yang Department of Medical Microbiology Faculty of MedicineUniversity of ManitobaWinnipegMBCanada Department of Immunology Faculty of MedicineUniversity of ManitobaWinnipegMBCanada

Recent studies suggest differential roles for CD103+and CD11bhi lung dendritic cells(LDCs)in host defense against viral and bacterial *** this study,we examined the contribution of these LDC subsets in protective immunity to chlamydial lung infection using a Chlamydia muridarum mouse infection *** found that CD103+LDCs showed higher expression of costimulatory molecules(CD40,CD80 and CD86)and increased production of cytokines(IL-12p70,IL-10,IL-23 and IL-6)compared with CD11bhi LDCs,but the expression of programmed death-ligand 1(PD-L1)was similar between the two *** importantly,we found,in adoptive transfer experiments,that the mice receiving CD103+LDCs from Chlamydia-infected mice exhibited better protection than the recipients of CD11bhi LDCs,which was associated with more robust Th1/Th17 cytokine *** addition,in vitro experiments showed that CD103+LDCs induced stronger IFN-γand IL-17 responses,when cocutured with chlamydial antigen-primed CD4+T cells,than CD11bhi ***,the blockade of PD1 in the culture of CD4+T cells with either CD103+or CD11bhi LDCs enhanced production of IFN-γand *** conclusion,our data provide direct evidence that CD103+LDCs are more potent in promoting Th1/Th17 immunity to chlamydial lung infection than CD11bhi LDCs.

关键词： Chlamydia muridarum lung dendritic cell Th1/Th17 cells

新能源汽车企业研发投入对创新绩效的影响——基于政府补助的调节效应分析

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科技管理研究 2024年第7期44卷 43-52页

作者：李晓敏刘世哲王淑贺河南大学经济学院河南开封475004

为探索研发投入和政府补助两种因素交叉在一起时会对企业创新绩效产生怎样的影响,以2012—2019年中国79家新能源汽车上市公司为样本,实证分析新能源汽车企业研发投入对创新绩效的影响,重点探讨新能源汽车企业获得的政府补助对研发投入... 详细信息

为探索研发投入和政府补助两种因素交叉在一起时会对企业创新绩效产生怎样的影响,以2012—2019年中国79家新能源汽车上市公司为样本,实证分析新能源汽车企业研发投入对创新绩效的影响,重点探讨新能源汽车企业获得的政府补助对研发投入与创新绩效关系的调节效应。研究发现,新能源汽车企业研发投入显著提升创新绩效,该影响在产业链中下游、后补贴时代更显著;新能源汽车企业获得的政府补助对研发投入与创新绩效的关系存在负向调节效应,即二者交叉在一起时对企业的创新绩效产生挤出效应,且该挤出效应在国有企业、缺乏经验企业、后补贴时代更显著;进一步研究发现,企业研发投入对开发性创新绩效的影响更大,且政府补助的调节效应仅存在于研发投入对开发性创新绩效的影响中。据此,新能源汽车企业应根据自身条件合理配置研发投入与政府补助资源,以有效提升创新绩效。

关键词：研发投入政府补助挤出效应调节效应创新绩效

Behavior of Zr-Rich Phase in a Cast NiAl-33.5Cr-0.5Zr Alloy during Heat Treatment

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Journal of Materials Science & Technology 2001年第6期17卷 629-632页

作者： Hui LI, sJianting GUQ, Wanhui LAI and shuhe wang Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China [Manuscript received July 7, 2000, in revised form October 11, 2000] Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

There are many Zr particles in as-cast NiAl-33.5Cr-0.5Zr (at. pct) alloy, which usually exist at the edge of eutectic of beta -NiAl and cx-Cr. After air and furnace cooling solution treatments, far 1400 degreesC, 2 h and 1450 degreesC, 1 h, pure Zr phase remains in the furnace cooling (F.C.) state alloys and Ni2AlZr phase forms in the air cooling (A.C.) state alloys. During solution treatment at 1450 degreesC, bulk and 'fish bone' shape Zr-rich phases form respectively in F.C. and A.C. state alloys. A 'river' shape Ni2AlZr phase forms after 1450 C for 1h F.C. and 850 degreesC for 12 h, F.C.. The alloy has less pure Zr and Ni2AlZr phase after 1400 degreesC with both air and furnace cooling followed by 850 C and 950 C for 12 h, F.C. aging treatments, respectively. Additionally, there is a ternary eutectic of NiAlZr and a phase enriched Zr and Cr forms at the edge of the eutectic of beta -NiAl and alpha -Cr in the alloy treated at 1400 degreesC, 2 h, F.C. and 950 degreesC, 12 h, F.C.

关键词： NiAl Zr Behavior of Zr-Rich Phase in a Cast NiAl-33.5Cr-0.5Zr Alloy during Heat Treatment Cr Cast

YNi_5 PHASE AND ITS EFFECT UPON PROPERTIES OF Ni_3Al ALLOY

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Acta Metallurgica Sinica(English Letters) 1992年第3期5卷 183-187页

作者： wang shuhe GUO Jianting LI Hui SUN Chao TAN Minghui LAI Wanhui Institute of Metal Research,Academia Sinica,Shenyang,China Inst of Metal Research Acad Sinica Shenyang China

An additive of Y to Ni_3Al based alloy may form a phase YNi_5 which increases in amount with the increase of Y *** was found that the YNi_5 phase in Ni_3Al alloy could remarkably make its grains finer and its grain boundaries more crooked other than *** the Y con- tent≥0.1 wt-%,it occurs as solid solution state and is favorable to high temperature compressive properties and oxidation resistance of the *** Y≥0.3 wt-%,the forma- tion of YNi_5 is predominant in the shape of irregular strips inside Ni_3Al grains and along their grain *** seems to be quite harmful to high temperature strength,ductility and oxidation resistance of the alloy.

关键词： Ni_3Al YNi_5 phase Y compressive property oxidation resistance

Respective IL-17A production by γδ T and Th17 cells and its implication in host defense against chlamydial lung infection

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Cellular & Molecular Immunology 2017年第10期14卷 850-861页

作者： Hong Bai Xiaoling Gao Lei Zhao Ying Peng Jie Yang Sai Qiao Huili Zhao shuhe wang YiJun Fan Antony George Joyee Zhi Yao Xi Yang Department of Immunology Max Rady College of MedicineRady Faculty of Health SciencesUniversity of ManitobaWinnipegManitobaCanada R3E 0T5 Department of Immunology School of Basic Medical SciencesTianjin Medical UniversityTianjin Key Laboratory of Cellular and Molecular ImmunologyKey Laboratory of Educational Ministry of ChinaTianjin 300070China

The role of IL-17A is important in protection against lung infection with Chlamydiae,an obligate intracellular bacterial *** this study,we explored the producers of IL-17A in chlamydial lung infection and specifically tested the role of major IL-17A producers in protective *** found thatγδT cells and Th17 cells are the major producers of IL-17A at the early and later stages of chlamydial infection,*** ofγδT cells in vivo at the early postinfection(p.i.)stage,when mostγδT cells produce IL-17A,failed to alter Th1 responses and bacterial *** contrast,the blockade of IL-17A at the time when IL-17A was mainly produced by Th17(day 7 p.i.)markedly reduced the Th1 response and increased chlamydial *** data suggest that theγδT cell is the highest producer of IL-17A in the very early stages of infection,but the protection conferred by IL-17A is mainly mediated by Th17 *** addition,we found that depletion ofγδT cells reduced IL-1αproduction by dendritic cells,which was associated with a reduced Th17 *** finding is helpful to understand the variable role of IL-17A in different infections and to develop preventive and therapeutic approaches against infectious diseases by targeting IL-17A.

关键词： chlamydia IL-17A γδT cell infection Th17

Microstructure of the Ductile Phase in Intermetallic Compound Ni_(50)Al_(20)Fe_(30)

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Journal of Materials Science & Technology 1994年第5期10卷 341-346页

作者： Lianlong HE shuhe wang Jianting GUO and Hengqiang YE (Lab. of Atomic Imaging of Solids, Institute of Metal Research, Academia Sinica, Shenyang, 110015, China)(To whom correspondence should be addressed) Lab of Atomic Imaging of Solids Shenyang China

The microstructure of the single hot extruded and annealed Ni50Al20Fe30Y0.003 intermetallic compound alloys has been examined by means of high resolution electron microscopy (HREM). In these extruded and annealed alloys. the ductile phase is of a mixture of the disordered fcc γ matrix and or dered γ' precipitates. This fact well interprets the reason why the degree of annealing treatment can influence the strength and ductility of these alloys. The HREM observation revealed directly that there was some strain concentration at γ'-γ interfaces, due to the presence of more iron atoms in these two phases. The fixed orientation relationship between the γ phase and γ' precipitates was identified to be {001}γ||{00 }γ' and γ|| γ'

关键词： Fe Figure Microstructure of the Ductile Phase in Intermetallic Compound Ni Al

MICROSTRUCTURAL STUDIES OF ULTRAFINE IRON PARTICLES

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Acta Metallurgica Sinica(English Letters) 1990年第8期3卷 136-139页

作者： wang shuhe CAI Yuling AN Gang WEN Lishi ZHUANG Yuzhi Institute of Metal Research,Academia Sinica,Shenyang,China wang shuhe,Associate Professor,Institute of Metal Research,Academia Sinica,Shenyang 110015,China

The constitution,structure and surface state of the ultrafine iron particles prepared by gas evaporation technique have been investigated by means of X-ray analysis,high-reasolution electron microscopy(HREM)and electron spectroscopy for chemical analysis(ESCA).The results showed that the fine particles are spherical ones of～20 nm in diameter with α-Fe cores and covered by Fe_3O_4 fine crystalline layers of～4 nm thickness.

关键词： ultrafine particle microstructure high-resolution lattice image