检索结果-南通市图书馆

Numerical study on cavity ignition process in a supersonic combustor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2020年第10期21卷 848-858页

作者： Yong-chao SUN Zun CAI Tai-yu WANG Ming-bo SUN Cheng GONG Yu-hui HUANG Science and Technology on Scramjet Laboratory College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410073China China Aerodynamics research and development center Mianyang 621000China

Large eddy simulations(LESs)of cavity ignition processes were performed in a 2 D ethylene-fueled supersonic combustor with a single rear-wall-expansion cavity based on *** ethylene combustion was modelled using a 35-step with 20-specie ethylene chemical mechanism,which had been validated by CHEMKIN *** effect on the ignition process of different ignition sites inside the cavity was then *** was found that the rear region of the cavity floor is an optimized ignition site where successful ignitions will be *** to different ignition behaviors,two flame extinguishing modes could be identified:blown-off extinguishing mode and flow dissipation extinguishing ***-off extinguishing mode mainly occurred after ignition near the cavity shear layer,in which the initial flame was blown off directly due to the high speed of the supersonic core *** dissipation extinguishing mode is likely to occur after ignition near the front and middle cavity floor as a result of severe turbulent dissipations and limited chemical *** study indicates that the movement routine of the initial flame is important for the ignition process,including both moving towards a favorable flow field and forming a large heat release region along the movement.

关键词： Ignition process Cavity Supersonic combustor Numerical study

Spontaneous apoptosis of cells in therapeutic stem cell preparation exert immunomodulatory effects through release of phosphatidylserine

在线全文

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2021年第8期6卷 2536-2549页

作者： Xuemei He Weiqi Hong Jingyun Yang Hong Lei Tianqi Lu Cai He Zhenfei Bi Xiangyu Pan Yu Liu Lunzhi Dai Wei Wang Canhua Huang Hongxin Deng Xiawei Wei Laboratory of Aging research and Cancer Drug Target State Key Laboratory of Biotherapy and Cancer CenterNational Clinical Research Center for GeriatricsWest China HospitalSichuan UniversityChengduSichuanPeople’s Republic of China Experimental Medicine center the Affiliated Hospital of Southwest Medical UniversityLuzhouSichuanPeople’s Republic of China

Mesenchymal stem cell(MSC)-mediated immunomodulation has been harnessed for the treatment of human diseases,but its underlying mechanism has not been fully *** cells,including apoptotic cells have immunomodulatory *** has been repeatedly reported that the proportion of nonviable MSCs in a MSC therapeutic preparation varied from 5-50%in the ongoing clinical *** is conceivable that the nonviable cells in a MSC therapeutic preparation may play a role in the therapeutic effects of *** found that the MSC therapeutic preparation in the present study had about 5%dead MSCs(DMSCs),characterized by apoptotic ***,1×10^(6) MSCs in the preparation contained about 5×10^(4) *** found that the treatment with even 5×10^(4) DMSCs alone had the equal therapeutic effects as with 1×10^(6) *** protective effect of the dead MSCs alone was confirmed in four mouse models,including concanavalin A(ConA)-and carbon tetrachloride(CCI4)-induced acute liver injury,LPS-induced lung injury and spinal cord *** also found that the infused MSCs died by apoptosis in ***,the therapeutic effect was attributed to the elevated level of phosphatidylserine(PS)upon the injection of MSCs or *** direct administration of PS liposomes(PSLs)mimic apoptotic cell fragments also exerted the protective effects as MSCs and *** Mer tyrosine kinase(MerTK)deficiency or the knockout of chemokine receptor C-C motif chemokine receptor 2(CCR2)reversed these protective effects of MSCs or *** results revealed that DMSCs alone in the therapeutic stem cell preparation or the apoptotic cells induced in vivo may exert the same immunomodulatory property as the'living MSCs preparation"through releasing PS,which was further recognized by MerTK and participated in modulating immune cells.

关键词： therapeutic protective preparation

In patients who had a stroke or TIA, enlarged perivascular spaces in basal ganglia may cause future haemorrhagic strokes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Stroke & Vascular Neurology 2024年第1期9卷 8-17,I0001-I0033页

作者： Yu Tian Mengxing Wang Yuesong Pan Xia Meng Xingquan Zhao Liping Liu Yongjun Wang Yilong Wang Department of Neurology Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Chinese Institute for Brain research BeijingChina National center for Neurological Diseases BeijingChina Advanced Innovation center for Human Brain Protection Capital Medical UniversityBeijingChina China National Clinical research center for Neurological Diseases BeijingChina

Introduction It remains unclear whether enlarged perivascular spaces(EPVS)predict poor clinical outcomes in patients with acute ischaemic stroke(AIS)or transient ischaemic attack(TIA).Method Data were obtained from the Third China National Stroke Registry *** estimated EPVS in basal ganglia(BG)and centrum semiovale(CSO)using a semiquantified scale(Grade from 0 to 4).Using Cox and logistic regression analyses,the associations of EPVS with 3-month and 1-year adverse outcomes(including recurrent stroke,ischaemic stroke,haemorrhagic stroke,combined vascular event,disability and mortality)were *** analyses of any association of cerebral small vessel disease at baseline and development of a small arterial occlusion(SAO)were *** Among 12603 patients with AIS/TIA,median age was 61.7±11.6 years,and 68.2%were *** adjusting for all potential confounders,frequent-to-severe BG-EPVS was associated with a decreased risk of recurrent ischaemic stroke(HR 0.71,95%CI 0.55 to 0.92,p=0.01)but an increased risk of haemorrhagic stroke(HR 1.99,95%CI 1.11 to 3.58,p=0.02)at 1 year after AIS/TIA,compared with none-to-mild *** with frequent-to-severe CSO-EPVS had a decreased risk of disability(OR 0.76,95%CI 0.62 to 0.92,p=0.004)and all-cause death(HR 0.55,95%CI 0.31 to 0.98,p=0.04)within 3-month but not 1-year follow-ups,compared with those with none-to-mild *** analyses showed that both BG-EPVS(HR 0.43,95%CI 0.21 to 0.87,p=0.02)and CSO-EPVS(HR 0.58,95%CI 0.35 to 0.95,p=0.03)were associated with a decreased risk of subsequent ischaemic stroke in patients with SAO during 1-year *** BG-EPVS increased the risk of haemorrhagic stroke in patients already with AIS/TIA within 1 ***,caution is recommended when selecting antithrombotic agents for secondary stroke prevention in patients with AIS/TIA and more severe BG-EPVS.

关键词： patients haemorrhagic prevention

development of a Simulation Package with Expert System for FMS in Windows Environment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Technology Letters 1996年第1期2卷 5-8页

作者：张浩 CIMS research center Tongji UniversityShanghai 200092P.R.China

This paper introduces the method of developing a simulation package with expert systemfor a flexible manufacturing system(FMS)in Windows environment and presents some sim-ulation results for real examples.

关键词： FMS Expert system Dynamic graphics simulation Object-oriented programming

Fast response CdS-CdSxTe(1-x)-CdTe core-shell nanobelt photodetector

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2018年第17期63卷 1118-1124页

作者： Mingwei Tang Pengfei Xu Zhong Wen Xing Chen Chenlei Pang Xuechu Xu Chao Meng Xiaowei Liu He Tian Nagarajan Raghavan Qing Yang Sate Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering Zhejiang University Hangzhou 310027 China The Fifth research Institute of Ministry of Industry and Information Technology (MIIT) Cuangzhou 510610 China center of Electron Microscopy. Zhejiang University Hangzhou 310027 China Engiaeering Product development (EPD) Pillar Singapore University of Technology and Design Singapore 487372. Singapore Collaborative Innovation center of Extreme Optics Shanxi University Taiyuan 030006 China

Quasi-one-dimensional semiconductor nanostructure-based photodetectors show high sensitivity but suffer from slow response speed due to surface reaction. Here, we report a fast-response CdS-CdSxTei-x-CdTe core-shell nanobelt photodetector with a rise time of 11 /.is, which is the fastest among CdS based photodetectors reported previously. The improved response speed is ascribed to the sup-pressed possibilities of surface reaction resulting from the core-shell structure and heterojunction among the CdS, CdSxTel-x and CdTe. The measured response spectrum of CdS-CdSxTe1-x-CdTe core-shell nano-belt photodetector covers a wide range from 355 to 785 nm. Moreover, high responsivity （1,520 A/W） and large 3 dB bandwidth （~22.9 kHz） are obtained along with the fast response, The high performance in responsivity, sensitivity, spectral response and photoresponse speed makes this device a promising candidate for practical application in optical sensing, communication and imaging.

关键词： CdS-CdSxTel-x-CdTe Core-shell Photodetector Fast response

Electronic, optical properties, surface energies and work functions of Ag_8SnS_6: First-principles method

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2015年第1期24卷 477-483页

作者：卢春林张林张云望刘慎业梅杨 Science and Technology on Plasma Physics Laboratory Research Center of Laser FusionChina Academy of Engineering Physics Jointment Laboratory for Extreme Conditions Matter Properties Southwest University of Science and Technology Research Center of Laser FusionChina Academy of Engineering Physics School of Physics and Electronic Engineering Mianyang Normal University

Ternary metal chalcogenide semiconductor Ag8 Sn S6, which is an efficient photocatalyst under visible light radiation,is studied by plane-wave pseudopotential density functional theory. After geometry optimization, the electronic and optical properties are studied. A scissor operator value of 0.81 e V is introduced to overcome the underestimation of the calculation band gaps. The contribution of different bands is analyzed by virtue of total and partial density of states. Furthermore, in order to understand the optical properties of Ag8 Sn S6, the dielectric function, absorption coefficient, and refractive index are also performed in the energy range from 0 to 11 e V. The absorption spectrum indicates that Ag8 Sn S6has a good absorbency in visible light area. Surface energies and work functions of（411）,（4 13）,（21 1）, and（112） orientations have been calculated. These results reveal the reason for an outstanding photocatalytic activity of Ag8 Sn S6.

关键词： density functional theory Ag8Sn S6 optical properties surface energy

Urokinase-type plasminogen activator is a modulator of synaptic plasticity in the central nervous system:implications for neurorepair in the ischemic brain

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration research 2020年第4期15卷 620-624页

作者： Manuel Yepes Division of Neuropharmacology and Neurologic Diseases Yerkes National Primate Research Center Department of Neurology Emory University School of Medicine Department of Neurology Veterans Affairs Medical Center

The last two decades have witnessed a rapid decrease in mortality due to acute cerebral ischemia that paradoxically has led to a rapid increase in the number of patients that survive an acute ischemic stroke with various degrees of ***,the lack of an effective therapeutic strategy to promote neurological recovery among stroke survivors has led to a rapidly growing population of disabled ***,understanding the mechanisms of neurorepair in the ischemic brain is a priority with wide scientific,social and economic *** ischemia has a harmful effect on synaptic structure associated with the development of functional *** agreement with these observations,experimental evidence indicates that synaptic repair underlies the recovery of neurological function following an ischemic ***,it has become evident that synaptic plasticity is crucial not only during development and learning,but also for synaptic repair after an ischemic *** plasminogen activating system is assembled by a cascade of enzymes and their inhibitors initially thought to be solely involved in the generation of ***,recent work has shown that in the brain this system has an important function regulating the development of synaptic plasticity via mechanisms that not always require plasmin ***-type plasminogen activator(uPA)is a serine proteinase and one of the plasminogen activators,that upon binding to its receptor(uPAR)not only catalyzes the conversion of plasminogen into plasmin on the cell surface,but also activates cell signaling pathways that promote cell migration,proliferation and *** role of uPA is the brain is not fully ***,it has been reported while uPA and uPAR are abundantly found in the developing central nervous system,in the mature brain their expression is restricted to a limited group of ***,following an ischemic injury to the mature brain the expressio

关键词： cerebral ischemia neurorepair plasminogen plasticity stoke synapse urokinase urokinase receptor

Transparent Access to Heterogeneous IoT Based on Virtual Resources

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第3期74卷 4983-4999页

作者： Wenquan Jin Sunhwan Lim Young-Ho Suh Chanwon Park Dohyeun Kim Big Data research center Jeju National UniversityJeju63243Korea Autonomous IoT research Section Intelligent Convergence Research LaboratoryElectronics and Telecommunications Research InstituteDaejeon34129Korea Department of Computer Engineering Jeju National UniversityJeju63243Korea

The Internet of Things(IoT)inspires industries to deploy a massive number of connected devices to provide smart and ubiquitous services to influence our daily *** computing leverages sufficient computation and storage at the edge of the network to enable deploying complex functions closer to the environment using Internet-connected *** to the purpose of the environment including privacy level,domain functionality,network scale and service quality,various environment-specific services can be provided through heterogeneous applications with sensors and actuators based on edge ***,for providing user-friendly service scenarios based on the transparent access to heterogeneous devices in edge computing,a consistent interface shall be provided to deliver services from edge computing to *** this paper,we propose transparent computing based on virtual resources to access heterogeneous IoT devices without considering the underlying network configuration at the edge of the *** supporting transparent access to different edge computing environments through a consistent interface,the virtual resource of edge gateway is proposed to bridge the Internet and devices which are deployed on the edge of the *** proposed edge gateway exposes the services of the Internet of Things devices to the Internet using virtual resources that represent the resources of physical *** virtual resources provide a consistent interface to enable clients to access devices in edge computing without considering underlying *** virtual resource is generated by the resource directory in the edge gateway through the registration of a *** on the device registration,the device information is stored in the gateway to link virtual resources and devices for translating messages according to the destination protocols and identifying physical devices that are represented by virtual ***,through collaboration with the serv

关键词： Internet of things edge computing edge gateway transparent computing virtualization resource directory virtual resource

research and Application on Platform Independent Automobile Remote Diagnosis Technology Based on Mobile Internent

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research and Application on Platform Independent Automobile ...