检索结果-南通市图书馆

heat transport in horizontally periodic and confined Rayleigh-Bénard convection with no-slip and free-slip plates

在线全文

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2022年第2期12卷 104-110页

作者： Maojing Huang xiaozhou he School of Mechanical Engineering and Automation Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

We report the results of the direct numerical simulations of two-dimensional Rayleigh-Bénard convection(RBC)in order to study the influence of the periodic(PD)and confined(CF)samples on the heat transport *** numerical study is conducted with the Rayleigh number(Ra)varied in the range 10^(6)≤Ra≤10^(9) at a fixed Prandtl number Pr=4.3 and aspect ratio Γ=2 with the no-slip(NS)and freeslip(FS)*** exists a zonal flow for Ra≥3×10^(6) with the free-slip plates in the periodic *** all the other cases,the flow is the closed large-scale circulation(closed LSC).The striking features are that the heat transport Nu is influenced and the temperature profiles do not be influenced when the flow pattern is zonal flow.

关键词： Rayleigh-Bénard convection Zonal flow Temperature profile Turbulence

A model for universal spatial variations of temperature fluctuations inturbulent Rayleigh-Bénard convection

在线全文

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2021年第2期11卷 102-104页

作者： xiaozhou he Eberhard Bodenschatz Guenter Ahlers School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518055China Max Planck Institute for Dynamics and Self Organization D-37073 GöttingenGermany International Collaboration for Turbulence Research Institute for Nonlinear Dynamics University of GöttingenD-37073 GöttingenGermany Laboratory of Atomic and Solid-State Physics and Sibley School of Mechanical and Aerospace Engineering Cornell UniversityIthacaNY 14853USA Department of Physics University of CaliforniaSanta BarbaraCA 93106USA

We propose a theoretical model for spatial variations of the temperature varianceσ2(z,r)(z is the dis-tance from the sample bottom and r the radial coordinate)in turbulent Rayleigh-Bénard convection(RBC).Adapting the“attached-eddy”modelofshearflowtothe plumesofRBC,wederivedanequationforσ2 which is based on the universal scaling of the normalized RBC temperature *** equation in-cludes both logarithmic and power-law dependences on z/λth,whereλth is the thermal boundary layer *** equation parameters depend on r and the Prandtl number Pr,but have only an extremelyweak dependence on the Rayleigh number Ra Thus our model provides a near-universal equation for thetemperature variance profile in turbulent RBC.

关键词： Rayleigh-Bénard convection Temperature variance profile Attached-eddy Law of wall

Vertical multiple-layer structure of temperature and turbulent diffusivity in the South China Sea

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2022年第10期41卷 14-21页

作者： Xin he Changrong Liang Yang Yang Guiying Chen Xiaodong Shang xiaozhou he Penger Tong State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou510301China University of Chinese Academy of Sciences Beijing100049China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China Institution of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou510301China Institute of Deep-Sea Science and Engineering Chinese Academy of SciencesSanya572000China School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen518055China Department of Physics Hong Kong University of Science and TechnologyHong Kong999077China

We report field measurements of vertical profiles of the turbulent diffusivity and temperature at different stations in the South China Sea(SCS).Our study shows that the measured turbulent diffusivity follows a power-law distribution with a varying exponent in water *** multiple-layer scaling regimes were also observed from the temperature *** turbulent diffusivity and temperature fluctuations,the vertical structure of temperature was ***,we discussed the temperature profiles in each layer.A constant function of a dimensionless temperature profile was found in water layers that have identical turbulence *** results reveal the multiple-layer structure of temperature in the *** study contributes to the understanding of the vertical structure of multiple layers in the SCS and provides clues for exploring the physical mechanism for maintaining the temperature structure.

关键词： temperature profile turbulent diffusivity South China Sea multiple layers

Logarithmic temperature profiles in turbulent thermal convection

在线全文

学校读者我要写书评

暂无评论

Logarithmic temperature profiles in turbulent thermal convec...

中国力学大会-2015

作者： he xiaozhou Max Planck Institute for Dynamics and Self Organization

This talk presents an analogous"Law of the Wall"for the temperature near a heated(or cooled)plate in turbulent Rayleigh-Benard convection(RBC).The experiment was conducted for the Rayleigh-number range l×l0

关键词：

Local Microenvironment Determines the Immunosuppressive Effect of Tolerogenic Bone Marrow-derived Dendritic Cells Pulsed by Liver X Receptor Agonist

在线全文

cnki会议

学校读者我要写书评

暂无评论

Local Microenvironment Determines the Immunosuppressive Effe...

第十三届全国免疫学学术大会

作者： Haiyan Xu xiaozhou he Renfang Xu Third Affiliated Hospital of Soochow University

Backgrounds: In our previous study, we showed that mice bone-marrow-derived dendritic cells pulsed by liver X receptor agonist-T0901317 developed tolerogenic characteristics, and they were thereafter designated as *** the present study, we further investigated the suppressive effect of T-tDCs and explored its underlying ***: T-tDCs were generated as described in our previous *** distribution of T-tDCs in vivo was analyzed, and the different amounts of T-tDCs cells were intravenously injected twice into the skin transplanted mice *** status of allografts was evaluated 8, 9, 11, and 14 days after *** specimens were analyzed by fluorescent multiple immunohistochemistry, real-time PCR, immunoblotting, ELISA and mixed lymphocyte ***: T-tDCs could migrate into peripheal lymphoid organs, skin, and *** rejection scores significantly decreased in the medium density(MD) and high density(HD) treatment groups 9 and 14 days after *** results showed that TGF-b1 levels in the skin allografts of HD groups and the IL-10 levels in the HD and low density(LD) treatment grous significantly increased, although serum TGF-b1 levels in the MD and HD groups markedly ***4FoxP3 Treg frequency in LD and HD groups significantly *** results of mixed lymphocyte reaction suggested the TGF-b1 and IL-10 that were secreted by T-tDCs are involved in the observed suppressive *** is thus a candidate receptor of the LXR agonist-T0901317, and the NF-kB and PI3K signaling pathways participate in the inhibition of ***: The local environment of skin allografts, high levels of TGF-b1, IL-10, and Treg frequency are fundamental mechanisms utilized by T-tDCs in eliciting their suppressive effects.

关键词： Tolerogenic dendritic cells Liver X receptor Transform growth factor-b1 Interleukin-10

Test of the anomalous scaling of passive temperature fluctuations in turbulent thermal convection

在线全文

cnki会议

学校读者我要写书评

暂无评论

Test of the anomalous scaling of passive temperature fluctua...

中国力学大会——2013

作者： Tong Penger he xiaozhou Shang Xiaodong Department of Physics Hong Kong University of Science and Technology Max Planck Institute for Dynamics and Self Organization D-37073 GottingenGermany State Key Laboratory of Tropical Oceano South China Sea Institute of OceanologyCHinese Academy of Sciences

The scaling properties ofthe temperature structure function (SF)and temperature-velocity cross-structure function(CSF) are investigated in turbulent Rayleigh-Benard *** measured SFs and CSFs are found to exhibit good scaling in space and time and a good agreement between the CSF exponents and the thermal dissipation exponents is observed,confirming that the anomalous scaling of passive temperature fluctuations in turbulent convection is indeed caused by the spatial

关键词：

The Abnormal High Expression of B Cell Activating Factor Belonging to TNF Superfamily (BAFF) and Its Potential Role in Kidney Transplant Recipients

在线全文

cnki会议

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2008年第6期5卷 465-470页

作者： Haiyan Xu xiaozhou he Qing Liu Yingdi Chen Yibei Zhu Dan Shi Xueguang Zhang The Third Affiliated Hospital of Soochow University Department ofUrology Medicine Changzhou Jiangsu China The First Affiliated Hospital of Soochow University 135 Clinical KeyLaboratory of Jiangsu Province Biotechnology Institute Laboratory SuzhouJiangsu China

B cell activating factor belonging to TNF superfamily （BAFF） is a critical regulator of B cell maturation and survival In this present study, the expression characteristic of BAFF in kidney transplantation recipients was investigated, its potential significance was analyzed and peripheral blood of follow-up kidney transplant recipients was studied. Flow cytometric assay results showed that, cell-surface BAFF was significantly highly expressed on peripheral CD3＋ T lymphocytes in 〉 5 yrs group of kidney transplant recipients, compared with other groups （p 〈 0.05）. BAFF expression could be found on CD4＋ T cells and CD8＋ T cells. The BAFF mRNA levels in peripheral mononuclear cells were consistent with the protein levels. However, serum soluble BAFF levels were inter- individually different in each group. Stratified by renal function, it was found that cell-surface BAFF levels were significantly higher in those with abnormal renal function, compared with recipients with normal renal function （p 〈 0.05）. ELISA assay results showed that expression levels of cell surface BAFF were significantly correlated with anti-HLA I ＆ II antibodies. These results indicate that BAFF may be involved in the development of graft-loss and influences the long-time outcome of kidney allografl, likely mediated by interfering with immune response. Cellular ＆ Molecular Immunology. 2008;5（6）：465-470.

关键词： BAFF expression renal allograft rejection

Test of the anomalous scaling of passive temperature fluctuations in turbulent Rayleigh Benard convection with spatial inhomogeneity

在线全文

学校读者我要写书评

暂无评论

Test of the anomalous scaling of passive temperature fluctua...

中国力学大会-2015

作者： Tong Penger he xiaozhou Shang Xiaodong Department of Physics Hong Kong University of Science and Technology Max Planck Institute for Dynamics and Self Organization State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of Sciences

The scaling properties of the temperature structure function(SF)and temperature-velocity cross-structure function(CSF)are investigated in turbulent Rayleigh-Benard convection(RBC).The measured SFs and CSFs exhibit good scaling in space and time and the resulting SF and CSF exponents are obtained both at the centre of the convection cell and near the sidewall.

关键词：

Aspect-ratio dependence of the transition to the ultimate regime

在线全文

cnki会议

学校读者我要写书评

暂无评论

Aspect-ratio dependence of the transition to the ultimate re...

中国力学大会-2015

作者： he xiaozhou Bodenschatz Eberhard Ahlers Guenter Max Planck Institute for Dynamics and Self Organization Department of Physics University of California

We report recent measurements of dimensionless heat transfer,the Nusselt number Nu,in turbulent Rayleigh-Benard convection(RBC)of three cylindrical samples with the aspect ratio(diameter/height)Γ=1.00,0.50 and *** samples have the same diameter of 1.1 m but di erent *** experiment were conducted in a Dressure vessel known as the"Uboot

关键词：