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青藏铁路运营十周年学术研讨会

作者： T.-T.MA Y WANG x.-l.zhou H.JIANG R.GUO l.-N.JIA H.CHANG Y GAO x.-Y.YAO Z.-M.GAO l.PAN Department of Geriatric Medicine Beijing Shijitan HospitalCapital Medical University Department of Hypox.a laboratory Beijing Shijitan HospitalCapital Medical University Department of Pathology Beijing Shijitan HospitalCapital Medical University Health Science Center of Peking University

OBJECTIVE:Rat models of hypobaric hypox.a-induced pulmonary hypertension are commonly used in studies of chronic mountain sickness,while there are few researches specially focusing on these rats *** study aims to ex.loring possible pathogenesis of hypobaric hypox.a-induced pulmonary hypertension by ex.erimenting on hypobaric hypox.ainduced PH rat models at different *** AND METHODS:32 healthy male SD rats were randomly divided into six.groups of different degree and time period of hypobaric *** mean pulmonary arterial pressure（m PAP）,right ventricular pressure（RVSP）,the right ventricle（RV）,left ventricular（lV）,ventricular septal（S）,the right ventricular hypertrophy index.RVHI）[calculated under the formula of RV/（lV + S）],hematox.lin-eosin staining,elastic fibers staining,the ratio of the thickness of vascular wall to its outer diameter（MT%）,the ratio of the cross-sectional area of the middle vascular wall to the total vascular cross-sectional area（MA%）;the a-SMA,and the Ki6 ex.ressions were detected to evaluated the pulmonary ***:There were significant differences of the mPAP,RVSP and RVHI value between the hypobaric hypox.a groups and the control group（p ＜ 0.05）.The mPAP,RVSP,RVHI,MT%,MA%,α-SMA,and Ki6 of rats in model groups at an altitude of 3KM were higher than those of the control group,which raised gradually with the number of weeks *** mPAP,RVSP,RV/（lV + S） value,MT%,MA%,a-SMA,and Ki67 of the 5KM-4W group were significantly higher than those of the control group（p ＜ 0.05）.CONClUSIONS:Rat models with pulmonary hypertension at different altitudes have been successfully established by automatic adjusting hypobaric hypox.a *** to a low ox.gen environment at a simulate-altitude of 3km for 8 weeks have caused the pathological remodeling of pulmonary vascular walls and pulmonary hypertension,and further led to a series of pathological changes,including right ventricular ***

关键词： Hypobaric hypox.a Pulmonary hypertension Animal models

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A SIMUlATION STUDY OF DEPOSITION UNDER TWO TYPES OF IMPINGING TRAJECTORIES

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Acta Metallurgica Sinica(English letters) 2004年第6期17卷 876-880页

作者： x.Q.Wei l.zhou SchoolofMaterialsScience＆Engineering NanchangUniversityNanchang330047China

A model coupling particle aggregation and randomwalk surface diffusion has been developed for 2D simulation of depositional growth, in which impinging particles follow either a straight-line trajectory of cosine distribution, representing typically sputter deposition, or a scattered trajectory, representing typically electrochemical deposition. Simulations of the growth under various impinging conditions and effective surface diffusivity have been carried out. Pattern and defect development in deposition on flat, trenched and ridged substrates have been investigated. We found that on flat and ridged substrates, both types of trajectories yield similar features, including formation of cone-like defects on surface ridges. While on trenched substrate, the straight-line impingement yielded more uniform step coverage than the scattered impingement.

关键词： deposition simulation pattern formation ballistic model

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NANOSIZE EFFECT IN GRAIN BOUNDARY MIGRATION OF COPPER

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Acta Metallurgica Sinica(English letters) 2004年第1期17卷 11-15页

作者： l.zhou x.Q.Wei N.G.zhou D.G.li School of Materials Science and Engineering Nanchang UniversityNanchang 330047ChinaSchool of Materials Science and EngineeringNanchang UniversityNanchang 330047ChinaSchool of Materials Science and EngineeringNanchang UniversityNanchang 330047ChinaCentral Iron and Steel Research InstituteBeijing 100083China

Molecular dynamics simulations of high temperature annealing of copper bicrystals have been carried out. The bicrystals have planar grain boundaries, and the gain size varies in nano range. An EAM (embedded atom method) potential of FS type is used for calculating the interatomic forces. The results show that in nanocrystalline copper, GB migration driven by inter-GB reaction can take place. A critical grain size is identified, below which the inter-GB reaction becomes strong enough to trigger GB motion, which accelerates rapidly and leads to annihilation of the grain boundaries. The critical size is found to be 16 atomic radii. A "through intermediate grain mechanism" is identified for the nano-grain boundary motion observed, which is never reported for GB migrations of conventional polycrystalline metals.

关键词： grain boundary migration nanocrystal copper

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Viscosity and structure relationship with equimolar substitution of CaO with MgO in the CaO–MgO–Al_(2)O_(3)–SiO_(2)slag melts

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 70-79页

作者： Yong Hou Shuo Zhang Jie Dang Jia Guo Hanghang zhou x.ewei lü College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China

Currently,the Al_(2)O_(3)content in the high-alumina slag systems within blast furnaces is generally limited to 16wt%–18.5wt%,making it challenging to overcome this *** most studies that concentrated on managing the MgO/Al_(2)O_(3)ratio or basicity,this paper ex.lored the effect of equimolar substitution of MgO for CaO on the viscosity and structure of a high-alumina CaO-MgO-Al_(2)O_(3)-SiO_(2)slag system,providing theoretical guidance and data to facilitate the application of high-alumina *** results revealed that the viscosity first decreased and then increased with higher MgO substitution,reaching a minimum at 15mol%MgO *** transform infrared spectroscopy(FTIR)results found that the depths of the troughs representing[SiO_(4)]tetrahedra,[AlO_(4)]tetrahedra,and Si-O-Al bending became progressively deeper with increased MgO *** of the Raman spectra showed that the average number of bridging ox.gens per Si atom and the x.(Q^(3))/x.(Q^(2))(x.(Q^(i))is the molar fraction of Q^(i) unit,and i is the number of bridging ox.gens in a[SiO_(4)]tetrahedral unit)ratio increased from 2.30 and 1.02 to 2.52 and 2.14,respectively,indicating a progressive polymerization of the silicate structure.x.ray photoelectron spectroscopy(x.S)results highlighted that non-bridging ox.gen content decreased from 77.97mol% to 63.41mol% with increasing MgO concentration,whereas bridging ox.gen and free ox.gen contents *** analysis demonstrated a gradual increase in the polymerization degree of the tetrahedral structure with the increase in MgO ***,bond strength is another important factor affecting the slag *** occurrence of a viscosity minimum can be attributed to the complex.evolution of bond strengths of non-bridging ox.gens generated during depolymerization of the[SiO_(4)]and[AlO_(4)]tetrahedral structures by CaO and MgO.

关键词： aluminosilicate viscosity structure spectroscopy

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Fluid-structure interaction in Z-shaped pipe with different supports

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Acta Mechanica Sinica 2020年第2期36卷 513-523页

作者： Q.Guo J.x.zhou x.l.Guan College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China Highway Science and Technology Research Institute Xinjiang Production and Construction Corpsürümqi 830002China

Fluid-structure interaction(FSI)has a strong relation with layout of fluid delivery *** is liable to cause local ***,FSI analysis is necessary in many cases,especially for flex.ble pipe *** modeling consists of eight governing equations and then completely solved via the finite volume method(FVM).Friction,Poisson and joint couplings were discussed in detail to reveal the influence of a Z-shaped pipe with different supports and elbows on *** the feasibility of solving FSI by FVM was verified,the different effects of free,fix.d and elastic supports on FSI in the commonly used and simplified Z-shaped pipe were further *** indicated that different support stiffness lead to various FSI *** coupling occurs at the elbow and less support is considered,then the pipe has a relatively large amplitude and complex.pressure fluctuation.

关键词： Fluid-structure interaction Finite volume method Z-shaped pipe Support stiffness

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Comparing surface erosion processes in four soils from the loess Plateau under ex.reme rainfall events

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International Soil and Water Conservation Research 2021年第4期9卷 520-531页

作者： liying Sun John l.zhou Qiangguo Cai Sux.a liu Jingan x.ao Key laboratory of Water Cycle and Related land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China School of Civil and Environmental Engineering University of Technology Sydney15 BroadwayNSW 2007Australia

This research aims to improve erosion control practice in the loess Plateau,by studying the surface erosion processes,including splash,sheet/interrill and rill erosion in four contrasting soils under high rainfall intensity(120 mm h^(−1))with three-scale indoor artificial *** contrasting soils as sandy loam,sandy clay loam,clay loam and loamy clay were collected from different parts of the loess *** results showed that sediment load was significantly impacted by soil properties in all three *** rate(4.0-21.6 g m^(−2∙)min^(−1))was highest in sandy loam from the north part of the loess Plateau and showed a negative power relation with the mean weight diameter of aggregates after 20 min of rainfall *** average sediment load by sheet/interrill erosion(6.94-42.86 g m^(−2∙)min^(−1))was highest in clay loam from middle part of the loess Plateau,and the stable sediment load after 20 min showed a positive power relation with the silt content in *** average sediment load increased dramatically by rill and interrill erosion(21.03-432.16 g m^(−2∙)min^(−1)),which was highest in loamy clay from south part of the loess *** average sediment load after the occurrence of rill showed a positive power relation with clay content and a negative power relation with soil organic matter *** impacts of slope gradient on the runoff rate and sediment load also changed with soil *** critical factors varied for different processes,which were the aggregate size for splash erosion,the content of silt particles and slope gradient for sheet/interrill erosion,and the content of clay particles,soil organic matter and slope gradient for rill *** on the results of the ex.eriments,specific erosion control practices were proposed by targeting certain erosion processes in areas with different soil tex.ure and different distribution of slope *** findings from this study should support the improvement of erosion

关键词： Soil erosion process Particle size Surface erosion Cropland management loess Plateau

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A FlEx.BlE PRECONDITIONED ARNOlDI METHOD FOR SHIFTED lINEAR SYSTEMS

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Journal of Computational Mathematics 2007年第5期25卷 522-530页

作者： G.-D. Gu x.-l. zhou lei lin Department of Applied Mathematics Shanghai University of Finance and Economics Shanghai 200433 China Department of Mathematics Shanghai University Shanghai 200436 China

We are interested in the numerical solution of the large nonsymmetric shifted linear system, （A ＋ αI）x.-= b, for many different values of the shift a in a wide range. We apply the Saad＇s flex.ble preconditioning technique to the solution of the shifted systems. Such flex.ble preconditioning with a few parameters could probably cover all the shifted systems with the shift in a wide range. Numerical ex.eriments report the effectiveness of our approach on some problems.

关键词： Shifted linear systems 65F10 65Y20. Arnoldi method Flex.ble preconditioning

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lessons on mobile apps for COVID-19 from China

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Journal of Safety Science and Resilience 2021年第2期2卷 40-49页

作者： Sophia l.zhou x.anhan Jia Samuel P.Skinner William Yang Isabelle Claude Mass Academy of Math and Science Worcester Polytechnic Institute85 Prescott StreetWorcesterMA 01605United States Department of Computer Science Worcester Polytechnic Institute100 Institute RoadWorcesterMA 01609United States Department of Physics Worcester Polythenic Institute100 Institute RoadWorcesterMA 01609United States Department of Biomedical Engineering Worcester Polytechnic Institute100 Institute RoadWorcesterMA 10609United States

The COVID-19 pandemic has impacted the global society and human life *** countries have launched COVID-19 mobile apps with a wide range in how these apps *** it is hoped that these apps can assist in the fight against COVID-19,many are worried about user *** implemented“health code”systems,which assigned neighborhoods and citizens a specific health code,meant to indicate their risk of having been ex.osed to *** most widely used health code systems were hosted on the popular apps WeChat and Alipay,each with billions of *** ex.erts argued that China’s use of mobile applications was essential to its successful combat against *** in this study are a summary of mobile technology usage in China,a review of previous studies of mobile technology in healthcare,and a brief survey of some ex.sting mobile applications for COVID-19 that were *** included are outcomes of interviews with healthcare and public safety ex.erts and a public survey to understand how mobile applications were used in China’s response to *** interviews revealed four important themes:personal privacy,community involvement,government involvement,and situational *** was found that a key concern was maintaining a balance between collecting and utilizing personal information,as well as protecting this *** addition,close collaboration between local communities and the national government was *** applications assisted in communication and coordination but did not replace the work of people such as delivery drivers and contact *** results also showed that there was room for improvement,especially accessibility for the elderly or those unfamiliar with *** results were obtained from our *** was interesting to find that the apps were mostly used for“accessing information on COVID-19.”In addition,respondents overwhelmingly identified“information”as the most valuable featur

关键词： Mobile apps COVID-19 response Survey Interview lessons

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Phenanthrene sorption to environmental black carbon in sediments from the Song-liao watershed(China)

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Frontiers of Environmental Science & Engineering 2009年第4期3卷 434-442页

作者： Jinghuan ZHANG Mengchang HE Chunye lIN Ke SUN Bin MEN John l.zhou State Key laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China

Black carbon(BC)in ten contaminated sediments from the Song-liao watershed,NE China,was isolated upon treatments using a combustion method at 375℃,and the isolates’sorption isotherms for phenanthrene(Phen)were *** sorption isotherms were nonlinear and fitted well by the Freundlich model.A negative relation was found between Freundlich sorption nonlinearity parameter(n values)and BC/total organic carbon(TOC)content of the original sediments(r^(2)=0.687,plates from this industrialized region had n values of 0.342 to 0.505 and logKFOC values of 6.02 to 6.42(μg·kg^(–1)·OC^(–1))/(μg·l^(–1))n for *** a given Ce,the BC had higher Koc value than the original sediments,revealing a higher sorption capacity for *** was responsible for 50.0%to 87.3%of the total sorption at Ce=0.05 Sw,clearly indicating the dominance of BC particles in overall sorption of Phen by sediments.

关键词： phenanthrene sorption black carbon sediment Song-liao watershed

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Finite Element Prediction of the Thermal Conductivity of GNP/Al Composites

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Acta Metallurgica Sinica(English letters) 2022年第5期35卷 825-838页

作者： x.S.Yang l.zhou K.Y.liu Z.Y.liu Q.Z.Wang B.l.x.ao Z.Y.Ma School of Electromechanical and Automotive Engineering Yantai UniversityYantai264005China Shi-Changx. Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

A 3 D multi-scale finite element model was developed to predict the effective thermal conductivity of graphene nanoplatelet(GNP)/Al *** factors influencing the effective thermal conductivity of the GNP/Al composites were investigated,including the orientation,shape,aspect ratio,configuration and volume fraction of *** results show that GNPs shape has a little influence on the thermal conductivity of GNP/Al composites,and composites with elliptic GNPs have the highest thermal *** addition,with increasing the aspect ratio of GNPs,the thermal conductivity of GNP/Al composites increases and finally tends to be *** GNPs configuration strongly influences the thermal conductivity of GNP/Al composites,and the thermal conductivity of the composites with layered GNPs is the highest among the five *** effective thermal conductivity is sensitive to volume fraction of ***,when the volume fraction of layered GNPs reaches 1.54%,the thermal conductivity of GNP/Al composites is as high as 400 W/m *** findings of this study could provide a good theoretical basis for designing high thermal conductivity GNP/Al composites.

关键词： Multi-scale finite element model Thermal conductivity GNP/Al composites Shape Aspect ratio Configuration

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