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Strain Growth in Containment Vessels

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Transactions of Tianjin University 2006年第B09期12卷 193-198页

作者： dong q LI q M ZHENG J Y School of Mechanical Aerospace and Civil Engineering The University of Manchester PO Box 88 Manchester M60 1QD UK Institute of Chemical Machinery Zhejiang University Hangzhou 310027 China

Strain growth is a phenomenon observed in containment vessels subjected to internal blast loading. The elastic response of the vessel may become larger in a later stage compared to its response during the initial stage. The dynamic responses of infinitely long cylindrical containment vessels subjected to uniformly-distributed internal blast loading are studied using LS-DYNA. The development of bending modes and the interaction between the breathing mode and bending modes are observed. The methodology developed for dynamic elastic buckling analysis is employed to study the strain growth phenomenon in explosion containment vessels. It is shown that the dynamic instable vibration of a containment vessel is the basic mechanism of strain growth.

关键词： strain growth containment vessel dynamic response impulsive loading

A brief review：experimental investigation of zonal flows and geodesic acoustic modes in fusion plasmas

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Plasma Science and Technology 2018年第9期20卷 72-84页

作者： K J ZHAO J q dong J q LI L W YAN Southwestern Institution of Physics Chengdu 610041People＇s Republic of China

Zonal flows self-generated by turbulence play an important role in regulating turbulence,reducing transport level,and thus improve plasma confinement in fusion *** zonal flows and geodesic acoustic modes have been identified in various *** related issues,such as the poloidal and toroidal symmetries,coupling to turbulence,effects on turbulence and transport,nonlinear energy transfer between turbulence and zonal flows,dependence of the plasma parameters,roles in the confinement regime transitions etc are overviewed briefly in this *** interaction between zonal flows and magnetic islands is emphasized.

关键词： zona flow tokamak turbulence fusion plasma

MICROSTRUCTURAL STUDY OF Fe-Cr-Al/Al COMPOSITE COATINGS DURING OXIDATION AND SULFIDATION AT 900℃

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Acta Metallurgica Sinica(English Letters) 2007年第2期20卷 87-94页

作者： Z.L. Zhang D.Y. Li X.q. dong School of Material Science and Engineering Shenyang University of Technology Shenyang 110023 China

The microstructure of a composite coating system, which was composed of an inner layer of Fe-Cr-Al and an outer layer of aluminum, was studied after it was respectively oxidized and sulfurdized at elevated temperatures. Apart from the Al2O3 scale formed on the surface, the microstructure of the composite coatings exposed at 900℃ in air for 4h was a three-layer structure. The first layer consisted of a solid solution of Cr and Fe in α aluminum and an intermetallic compound FeAl3 while the second layer was a single phase of the aluminide and the third layer still remained the same appearance as the original Fe-Cr-Al coating. The microstructural observation of the specimen tested at 850-900℃ at low oxygen pressure and high sulfur pressure for 576h revealed that the surface coatings of the specimen had transformed into a duplex structure containing an outer layer and a thicker aluminide layer beneath. X-ray diffraction results showed that the out layer was composed of Al2S3 and Al2O3 and that AlCrFee was the main phase composition of the aluminide layer, with a few of Al2S3 and Al2O3 accompanied.

关键词： arc spray Fe-Cr-Al composite coating microstructure

Effects of Sheared Flow on Microinstabilities and Transport in Plasmas

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Plasma Science and Technology 2005年第1期7卷 2610-2614页

作者： H.Sanuki K.Itoh A.Fujisawa J.q.dong National Institute for Fusion Science Toki Gifu 509-5292 JapanNational Institute for Fusion Science Toki Gifu 509-5292 JapanNational Institute for Fusion Science Toki Gifu 509-5292 JapanSouthwestern Institute of Physics Chengdu 610041 China

Theoretical and experimental studies associated with electric field effectson the stability and transport are briefly surveyed. The effects of radial electric field on thesuppression and/or enhancement of various microinstabilities such as drift waves, flute mode andtemperature gradient modes are discussed. The suppression of flow shear on the electron temperaturegradient mode in plasmas with slightly hollow density profiles is investigated by solving thegyrokinetic integral eigenvalue equation. Comparison between theoretical predictions andexperimental observations based on the HIBP measurements with high temporal and spatial resolutionsis made in bumpy tori and heliotron (CHS) devices.

关键词： sheared flow microinstabilities transport bumpy tori heliotron

Simultaneous high-resolution x-ray backlighting and self-emission imaging for laser-produced plasma diagnostics using a two-energy multilayer Kirkpatrick–Baez microscope

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Matter and Radiation at Extremes 2022年第1期7卷 47-52页

作者： S.Z.Yi J.q.dong L.Jiang q.S.Huang E.F.Guo Wang Z.S. MOE Key Laboratory of Advanced Micro-Structured Materials No.1239 Siping RoadShanghai 200092China School of Physics Science and Engineering Tongji UniversityShanghai 200092China Shanghai Institute of Laser Plasma CAEPP.O.Box 919-988Shanghai 201800China

A simultaneous high-resolution x-ray backlighting and self-emission imaging method for laser-produced plasma diagnostics is developed in which two Kirkpatrick–Baez imaging channels for high-energy and low-energy diagnostics are constructed using a combination of multilayer mirrors in near-coaxial *** using a streak or framing camera placed on the image plane,both backlit and self-emission images of a laserproduced plasma with high spatial and temporal resolution can be obtained simultaneously in a single *** paper describes the details of the method with regard to its optical and multilayer design,assembly,and alignment *** addition,x-ray imaging results with a spatial resolution better than 5μm in the laboratory and experimental results with imploding capsules in the SG-III prototype laser facility are presented.

关键词： method. multilayer resolution

EFFECTS OF STRUCTURAL DIMENSIONS AND MATERIAL PROPERTIES ON THE BLAST LOADING AND DYNAMIC ELASTIC RESPONSE OF CONTAINMENT VESSELS

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EFFECTS OF STRUCTURAL DIMENSIONS AND MATERIAL PROPERTIES ON ...

Emission Characteristics and Axial Flame Temperature Distribution of a Circumferential Reverse Flow Combustor

The 7th International Conference on Shock and Impact Loads on Structures

作者： q.dong The University of Manchester United Kingdom q.M.Li~* The University of Manchester United Kingdom J.Y.Zheng Zhejiang University China

＜正＞The blast loading and dynamic elastic response of a containment vessel due to the internal detonation of a high explosive are studied in this *** on the parametric analyses on the structural dimensions and material properties of containment vessels,the interactions between the blast loading and dynamic elastic response of containment vessels are investigated in the primary-shock period and the shock-reflection *** is shown that the density and the thickness of the vessel may affect the peak overpressure in the primary-shock period while resonance or beating may happen when the frequency of the reflected shock waves is close to the frequency of the breathing mode in the shock-reflection *** addition,the ratio of thickness to radius is a very sensitive factor for affecting the occurrence of strain growth in containment *** effects of the thickness-toradius ratio on the degree of strain growth are examined to assist engineering design. The fundamental features of the dynamic elastic response of containment vessels are investigated through an elastic circular plane-strain ring subjected to internal blast loading（or an infinite cylindrical shell subjected to an internal linear blast loading along its axis） using the dynamic nonlinear finite element program LS-DYNA.

关键词： structural dimension material property blast loading dynamic elastic response containment vessel

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Journal of Energy and Power Engineering 2010年第7期4卷 9-14页

作者： C. dong q.L. Zhou X.G. Zhang P. Sun T.M. Xu S.E. Hui q.X. Zhao State Key Laboratory of Multiphase Flow in Power Engineering Xi ＇an Jiaotong University Xi ＇an 710049 China

In partially premixed combustion of gas turbine, the combustion temperature should be lowed in order to reduce NOx. One solution is lean premixed combustion. However, the problem is that large excess air ratio may make the combustion unstable. A novel combustor with circumferential reverse flow of fuel gas is proposed for settling this problem. A 10 kw furnace is established to test performance of this combustor. Three factors such as primary air ratio, position of secondary air, total excess air ratio are studied. The emission characteristics and axial flame temperature distribution are studied. Basing on experimental results, the axial flame temperature and NOr emission increase with primary air ratio and axial length of second stream, and decrease with total excess air ratio. When the total excess air ratio is larger than 1.05, the combustor presents a lower temperature field and much lower NOx emission （less than 10 ppm）.

关键词： Partially premixed combustor secondary air distributor NOx emission axial flame temperature experimentalinvestigation.

Association of N-terminal pro-brain natriuretic peptide with the severity of coronary artery disease in patients with normal left ventricular ejection fraction

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Chinese Medical Journal 2014年第4期127卷 627-632页

作者： Wu Nq Guo YL Li XL Liu J qing P Xu RX Zhu CG Jia Y J Liu G dong q Jiang LX Li J J Ma FL Division of Dyslipidemia State Key Laboratory of Cardiovascular Disease Fu Wai Hospital National Center for Cardiovascular Disease Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100037 China Department of Cardiology First Hospital of Hohhot Hohhot Inner Mongolia 010030 China

Backround N-terminal pro-brain natriuretic peptide （NT-proBNP） is a reliable predictor in acute coronary artery disease （CAD）. Little is known about patients with stable CAD, especially Chinese patients with CAD. The aim of the present study was to investigate the association of NT-proBNP levels with the severity of CAD in patients with normal left ventricular ejection fraction. Methods A total of 658 consecutive patients were divided into two groups based on angiograms： CAD group （n=484） and angiographic normal control group （n=174）. The severity of CAD was evaluated by modified Gensini score, and its relationship with NT-proBNP was analyzed. Results The prevalence of risk factors such as age, male gender, diabetes mellitus （DM）, dyslipidemia, smoking, and family history of CAD in the CAD group were higher than that in the control group. In multivariate regression model analysis, age, gender, and DM were determinants of the presence of CAD. NT-pro BNP was found to be an independent predictor for CAD （OR：1.66 （95% CI： 1.06-2.61）, P 〈0.05）. In a receiver operating characteristic （ROC）curve analysis, an NT-proBNP value of 641.15 pmol/L was identified as a cut-off value in the diagnosis or exclusion of CAD （area under curve （AUC）=0.56, 95% CI： 0.51-0.61）. Furthermore, NT-proBNP was positively correlated with Gensini score （r=0.14, P 〈0.001） in patients with CAD. Conclusion NT-proBNP was an independent predictor for Chinese patients with CAD, suggesting that the NT-proBNP level might be associated with the presence and the severity of CAD.

关键词： N-terminal pro-brain natriuretic peptide coronary artery disease risk factors modified Gensini score

The Research on Expression of Platelet Activation Markers and CD62P in Patients with Acute Cerebral Ischemic Stroke and Influence of Using of Anti-Platelet Drugs

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The Research on Expression of Platelet Activation Markers an...