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Experimental and numerical studies on interactions of a spherical flame with incident and reflected shocks

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Acta Mechanica Sinica 2009年第2期25卷 173-179页

作者： Mingyue gui Baochun Fan gang Dong Jingfang Ye State Key Laboratory of Transient Physics Nanjing University of Science and Technology210094 Nanjing China State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology 100081 Beijing China

Observations are presented from experiments and calculations where a laminar spherical CH4/air flame is perturbed successively by incident and reflected shock waves. The experiments are performed in a standard shock tube arrangement, in which a high-speed shadowgraph imaging system is used to record evolutions of the flame. Numerical simulations are conducted by using second-order wave propagation algorithms, based on two-dimensional axisymmetric Navier-Stokes equations with detailed chemical reactions. Qualitative agreements are obtained between the experimental and numerical results. Under actions of incident shock waves, Richtmyer-Meshkov instability responsible for the flame deformation is induced in the flame, and the distoned flame takes a barrel shape. Then, under subsequent actions of the shock wave reflected from a planar wall, the flame takes an inclined non-symmetrical kidney shape in a symmetric cross section, which means a mushroom-like shape of the flame comes finally into being. The vorticity direction in the ring cap has been altered by the reflected shock＇s action, which makes the head of the mushroom-like flame extend quickly to the side wall.

关键词： Shock-flame interaction Flame instability -Vorticity Shock reflection

Acoustic topological adiabatic passage via a level crossing

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Science China(Physics,Mechanics & Astronomy) 2021年第4期64卷 2-9页

作者： Ya-Xi Shen Long-Sheng Zeng zhi-Guo Geng De-gang Zhao Yu-gui Peng Jie Zhu Xue-Feng Zhu School of Physics and Innovation Institute Huazhong University of Science and TechnologyWuhan 430074China Department of Mechanical Engineering Hong Kong Polytechnic UniversityHong KongChina Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China

Stimulated adiabatic passage has been extensively studied to achieve robust and selective population transfer in quantum systems. Recently, the quantum-classic analogy has been rapidly developing and can be considered responsible for the implementation of the adiabatic transfer of sound energy in cavity chain systems. In this article, we investigate the adiabatic transfer of sound energy between two topological end states in the Su-Schrieffer-Heeger(SSH) cavity chain, which can be considered to be the acoustic analog of the quantum chirped-pulse excitation. The topological adiabatic passage in SSH cavity chain has two categories. When the single-cavity resonance frequencies on the sublattices A and B in the SSH cavity chain do not switch their spectrum positions, the topologically protected adiabatic evolution results in the returning passage of the sound excited in one end cavity. When a level crossing with single-cavity resonance frequencies on the sublattices A and B exhibits switch in the frequency spectrum, acoustic energy is observed to be topologically pumped between the two end cavities of the SSH chain.

关键词： acoustic adiabatic passage topological end state level crossing

Highly Stretchable and Conductive Hybrid Fibers for High-performance Fibrous Electrodes and All-solid-state Supercapacitors

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Chinese Journal of Polymer Science 2020年第5期38卷 531-539,I0007页

作者： gui-Qing Wu Xin-Yu Yang Jia-Hui Li Nan Sheng Cheng-Yi Hou Yao-gang Li Hong-zhi Wang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China School of Materials Science and Engineering Nanyang Technological University639798Singapore

The development of lightweight,flexible,and stretchable energy storage systems is essential for state-of-the-art electronic *** propose a new and broad strategy to fabricate a stretchable and conductive GO/CNTs-TPU fiber electrode by direct wet spinning,from which a flexible fibrous supercapacitor is *** fibrous electrode exhibits a high strength of 11.68 MPa,high conductivity of 342 S/cm,and high specific capacitances(21.8 mF/cm,36.45 F/cm^3,and 95 F/g).The specific capacitance of the assembled all-solid-state hybrid fiber-shaped supercapacitor reaches 14.3 F/cm^*** 5000 charge-discharge cycles,97%of the capacitance of the hybrid supercapacitor is *** high-strength electrochemical electrode materials could be potential candidates for applications in practical and large-scale energy storage systems and textile clothes.

关键词： Graphene Carbon nanotubes Thermoplastic polyurethane Supercapacitor Flexibility

Interleukin- 13 interferes with activation-induced t-ce apoptosis by repressing p53 expression

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Cellular & Molecular Immunology 2016年第5期13卷 669-677页

作者： Li Yang Ling-zhi Xu zhi-Qiang Liu gui Yang Xiao-Rui Geng Li-Hua Mo zhi-gang Liu Peng-Yuan Zheng Ping-Chang Yang Department of Gastroenterology the Zhengzhou People's Hospital Zhengzhou China Department of Gastroenterology the Fifth Affiliated Hospital of Zhengzhou University Zhengzhou China Shenzhen Key Laboratory of Allergy and Immunology Shenzhen University School of Medicine and State Key Laboratory of Respiratory Disease for Allergy at Shenzhen University Shenzhen China ENT Institute of Shenzhen University Longgang Central Hospital Shenzhen China

The etiology and the underlying mechanism of CD4＋ T-cell polarization are unclear. This study sought to investigate the mechanism by which interleukin （IL）-13 prevents the activation-induced apoptosis of CD4＋ T cells. Here we report that CD4＋ T cells expressed IL-13 receptor a2 in the intestine of sensitized mice. IL-13 suppressed both the activation-induced apoptosis of CD4＋ T cells and the expression of p53 and FasL. Exposure to recombinant IL-13 inhibited activation-induced cell death （AICD） along with the expression of p53, caspase 3, and tumor necrosis factor-a in CD4＋ T cells. Administration of an anti-lL-13 antibody enhanced the effect of specific immunotherapy on allergic inflammation in the mouse intestine, enforced the expression of p53 in intestinal CD4＋ T cells, and enhanced the frequency of CD4＋ T-cell apoptosis upon challenge with specific antigens. In summary, blocking IL-13 enhances the therapeutic effect of antigen-specific immunotheraov by regulating aDoptosis and thereby enforcing AICD in CD4＋ T cells.

关键词： activation-induced cell death apoptosis interleukin 13 T lymphocytes Th2 polarization

Delayed Fracture Resistance and Mechanical Properties of 30MnSi High Strength Steel

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Journal of Iron and Steel Research International 2009年第3期16卷 49-54页

作者： XIAO gui-zhi DI Hong-shuang The State Key Laboratory of Rolling Technology and Automation Northeastern UniversityShenyang 110004 Liaoning China

To investigate the effect of heat treatment on mechanical properties and delayed fracture resistance of high strength steel,30MnSi prestressed concrete （PC） steel bars are quenched and tempered. Tensile results show that,after 950 ℃ quenching and about 430 ℃ tempering,30MnSi PC steel bars have superior mechanical properties and delayed fracture resistance. Microstructural observation shows that 30MnSi steel bar is mainly composed of fine tempered sorbite （troostite） with carbide distributed along the lath martensite boundaries. It can be concluded that thermal refining is an effective way to improve mechanical properties and delayed fracture resistance of 30MnSi PC steel bar.

关键词： delayed fracture quenching tempering mechanical property PC steel bar

Visible Light-Mediated Construction of Sulfonated Dibenzazepines

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Chinese Journal of Chemistry 2021年第8期39卷 2220-2226页

作者： Chuan-Hua Qu gui-Ting Song Jian-Hua Ou Dian-Yong Tang zhi-gang Xu Zhong-Zhu Chen College of Pharmacy National&Local Joint Engineering Research Center of Targeted and Innovative TherapeuticsChongqing Key Laboratory of Kinase Modulators as Innovative MedicineChongqing University of Arts and SciencesChongqing 402160China

A new method to access sulfonated dibenz[b,e]azepines via visible-light photoredox catalysis is *** ying inexpe nsive and commercially available sulfonyl chlorides to form the sulfonyl radicals enables the alkyne addi... 详细信息

关键词： Photocatalysis Sulfonated dibenzazepines Radical reactions Ugi reaction Annulation

InCl_3·4H_2O Catalyzed Aldol Condensation of Cycloalkanones with Aromatic Aldehydes

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Chinese Chemical Letters 2001年第10期12卷 859-860页

作者： gui Sheng DENG Tie gang REN College of Chemistry and Chemical Engineering Hunan Normal UniversityChangsha 410081

InCl34H2O catalyzes the cross-aldol condensation of cycloalkanones with aromatic aldehydes in sealed tube under solvent free condition to afford an efficient method for the synthesis of a, a-bis(substituted)benzyliden... 详细信息

关键词： Aldol condensation cycloalkanone indium trichloride catalysis.

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股骨近端良性肿瘤及瘤样病变的外科治疗

中国血液流变学杂志 2016年第2期26卷 202-206页

作者：周立宇杨同其张志刚吴贵忠杨惠林徐明苏州大学附属第一医院骨科江苏苏州215006

目的探讨股骨近端良洼肿瘤及瘤样病变的手术切除及骨修复重建方法。方法对2013年01月—2015年06月共收治的35例股骨近端良性肿瘤及瘤样病变的外科治疗及疗效进行回顾性分析，疾病种类主要包括纤维结构不良，单纯性骨囊肿等。给予病灶彻... 详细信息

目的探讨股骨近端良洼肿瘤及瘤样病变的手术切除及骨修复重建方法。方法对2013年01月—2015年06月共收治的35例股骨近端良性肿瘤及瘤样病变的外科治疗及疗效进行回顾性分析，疾病种类主要包括纤维结构不良，单纯性骨囊肿等。给予病灶彻底刮除及植骨，并采用不同的重建方式，其中单纯肿瘤刮除6例，髓内固定4例，髓外固定20例，人工关节置换5例。结果所有患者均获得随访，时间10一32个月，平均20．2个月。患者切口均一期愈合，元感染，未见复发及骨折，未见股骨头囊性变及坏死，无内固定松动失效。末次随访MSTS93评分26～30分，平均28．08分。结论依据股骨近端良性肿瘤及瘤样病变发生的部位、范围、生物学特性、股骨近端的生物力学及全身综合情况选择合适的重建方式，

关键词：股骨近端良性肿瘤及瘤样病变外科治疗

Canopy gap characteristics and spatial patterns in a subtropical forest of South China after ice storm damage

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Journal of Mountain Science 2020年第8期17卷 1942-1958页

作者： LIU Feng YANG zhi-gao ZHANG gui College of Science Central South University of Forestry and TechnologyChangsha 410004China Key Laboratory for Digital Dongting Lake basin of Hunan Province Central South University of Forestry and TechnologyChangsha 410004China

The divergent gap characteristics and spatial patterns of canopy gaps created by natural or artificial disturbances can exert a dominant influence on forest structure and ***,little research has been conducted on the effects of ice storm damage on canopy gaps in subtropical mature forests of South *** this study,one semi-natural site was dominated by a broad-leaf forest and two managed sites were representative of plantations with coniferous *** on airborne laser scanning data and field evidence across sites,statistical analyses were used to examine gap characteristics following ice storms of moderate *** Ripley’s K-function analysis was applied to test gap spatial patterns at a range of scales,and spatial point pattern analysis was used to quantitate the relative importance of specific influences on patterns of gap *** results revealed that the average gap size was 75.7 m^2 and that 12.2 gaps occurred per *** gaps were single-tree fall *** addition to more gaps,the mean gap size was smaller and the shape was more complex in the semi-natural site than in two managed *** differences in gap characteristics were observed among snapped,uprooted,snag,and artificial gap damage *** generally showed a clustered distribution at large scales(e.g.70 m),whereas spatial patterns varied with gap damage types at different *** occurrence of gaps was strongly related to slope and topographic position at the semi-natural site,whereas slope,stem density,and human accessibility(proximity to pathways)were the most important factors affecting gap occurrence at the managed *** suggest that gap-based silvicultural treatments and natural disturbances regimes conjoin,highlighting interactions with other factors such as microsite conditions,non-tree vegetation and more.

关键词： Canopy gap Disturbance Spatial point pattern Influence factors Silviculture