检索结果-南通市图书馆

Acta Mathematicae Applicatae Sinica 2024年第3期40卷 823-839页

作者： kai-ming YANG Yong-jiang GUO School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China

For a 2-station and 3-class reentrant line under first-buffer first-served(FBFS)service discipline in light traffic,we firstly construct the strong approximations for performance measures including the queue length,workload,busy time and idle time *** on the obtained strong approximations,we use a strong approximation method to find all the law of the iterated logarithms(LILs)for the above four performance measures,which are expressed as some functions of system parameters:means and variances of interarrival and service times,and characterize the fluctuations around their fluid approximations.

关键词： reentrant line queueing network FBFS service discipline strong approximation LIL Brownian motion

Conductance Oscillations in Spin Field-Effect Transistors

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第4X期46卷 743-748页

作者： JIANG kai-ming ZHENG Zhi-ming XING Ding-Yu National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093China

Ballistic spin transport in spin field-effect transistors is studied by taking into account the Rashba spinorbit coupling, interracial scattering, and band mismatch. It is shown that the spin conductance oscillation with the semiconductor channel length is a superimposition of the Rashba spin precession and spin interference oscillations. They have different oscillation periods π/κR and π/κ with κR the Rashba wavevector and κ the Fermi wavevector of the semiconductor channel, and play different parts of slow and rapid oscillations, depending upon the relative magnitude of π/κR and π/κ. Only at κ = κR does the spin conductance exhibit oscillations of a single period. Two types of different behaviors of the tunnelling magnetoresistance are discussed.

关键词： spin field-effect transistors Rashba spin-orbit coupling

Contrasting Impacts of South and North Tropical Indian Ocean Sea Surface Temperature Anomalies on East Asian Summer Climate

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2015年第6期8卷 327-332页

作者： HU kai-ming State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics & Center for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Sciences

Using observational data and model simulations,the author find that the North Indian Ocean(NIO)sea surface temperature(SST)anomalies can trigger an eastward atmospheric Kelvin wave propagating into the equatorial western Pacific,inducing an anomalous anticyclone over the subtropical Northwest Pacific(NWP)and resulting in prominent summer climate anomalies in the East Asia-Northwest Pacific(EANWP)***,the response of tropospheric temperatures and atmospheric Kelvin waves to the South Indian Ocean(SIO)SST anomalies is weak;as a result,the impact of the SIO SST anomalies on the EANWP summer climate is *** contrasting impacts of NIO and SIO SST anomalies on the EANWP summer climate is possibly due to the different mean state of SSTs in the two *** summer,the climatological SSTs in the NIO are higher than in the SIO,leading to a stronger response of atmospheric convection to the NIO SST anomalies than to the SIO SST ***,compared with the SIO SST anomalies,the NIO SST anomalies can lead to stronger tropospheric air temperature anomalies and atmospheric Kelvin waves to affect the EANWP summer climate.

关键词： Indian Ocean Northwest Pacific anticyclone East As

Development of a prognostic prediction model based on microRNA-1269a in esophageal cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2021年第8期13卷 943-958页

作者： Yong Yu kai-ming Ren Department of Ophtalmology Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina Department of Thoracic Surgery Shengjing Hospital of China Medical UniversityShenyang 110004China

BACKGROUND Esophageal cancer(ESCA)is a heterogeneous cancer with variable outcomes that are challenging to ***(miR)-1269a is a newly discovered noncoding RNA that shows promising prognostic prediction in other cancers,but its clinical value in ESCA remains *** To explore the relationship between miR-1269a and its clinical value and to develop a nomogram to succinctly display this *** We analyzed the expression of miR-1269a in 125 ESCA tissue samples with complete clinical data and 52 normal tissue *** determined the prognostic value of miR-1269a for overall survival(OS)and cancer-specific survival(CSS)and evaluated the association between miR-1269a and clinical variables including tumor location,histologic grade,metastatic stage,and American Joint Committee on Cancer(AJCC)stage using multivariate Cox ***,we developed a nomogram for OS and CSS based on miR-1269a expression using age and AJCC stage and assessed its prognostic *** Gene Ontology and Kyoto Encyclopedia of Gene and Genomes analyses,we predicted the target genes of miR-1269a and analyzed their potential function in caner *** The expression of miR-1269a was significantly higher in ESCA patients than healthy *** with high expression of miR-1269a showed poor prognosis in OS and CSS,suffered increased rates of low differentiation and metastasis,and exhibited tumor stage T3+T4,positive lymph stage,and AJCC stage III+*** area under the receiver operating characteristic curve of miR-1269a was 0.716 for OS and 0.764 for *** Cox analysis revealed that AJCC stage and miR-1269a were independent factors for OS and *** with age,we constructed a nomogram for prognostic ***,our nomogram showed excellent predictive performance for OS and CSS after 3 years and 5 years and was easy to ***,the functional analysis suggested that miR-1269a was mostly involved in the P

关键词： MicroRNA-1269a Esophageal cancer Prognosis Overall survival Cancerspecific survival

Grain refinement in the coarse-grained region of the heat-affected zone in low-carbon high-strength microalloyed steels

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2010年第6期17卷 737-741页

作者： Ran Wei Cheng-jia Shang kai-ming Wu International Research Institute for Steel Technology Wuhan University of Science and Technology Wuhan 430081 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

The microstructural features and grain refinement in the coarse-grained region of the heat-affected zone in low-carbon high-strength microalloyed steels were investigated using optical microscopy, scanning electron microscopy, and electron backscattering dif- fraction. The coarse-grained region of the heat-affected zone consists of predominantly bainite and a small proportion of acicular ferrite. Bainite packets are separated by high angle boundaries. Acicular ferrite laths or plates in the coarse-grained region of the heat-affected zone formed prior to bainite packets partition austenite grains into many smaller and separate areas, resulting in fine-grained mixed microstruc- tures. Electron backscattefing diffraction analysis indicates that the average crystallographic grain size of the coarse-grained region of the heat-affected zone reaches 6-9 μm, much smaller than that of anstanite grains.

关键词： microalloyed steels welding grain refinement bainite acicular ferrite

Variability Analysis for a Two-station Queueing Network in Heavy Traffic with Arrival Processes Driven by Queues

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2024年第2期40卷 445-466页

作者： Jian CAO Yong-jiang GUO kai-ming YANG School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China

The law of the iterated logarithm(LIL)for the performance measures of a two-station queueing network with arrivals modulated by independent queues is developed by a strong approximation *** convenience,two arrival processes modulated by queues comprise the external system,all others are belong to the internal *** is well known that the exogenous arrival has a great influence on the asymptotic variability of performance measures in *** the considered queueing network in heavy traffic,we get all the LILs for the queue length,workload,busy time,idle time and departure processes,and present them by some simple functions of the primitive *** LILs tell us some interesting insights,such as,the LILs of busy and idle times are zero and they reflect a small variability around their fluid approximations,the LIL of departure has nothing to do with the arrival process,both of the two phenomena well explain the service station’s situation of being busy all the *** external system shows us a distinguishing effect on the performance measures:an underloaded(overloaded,critically loaded)external system affects the internal system through its arrival(departure,arrival and departure together).In addition,we also get the strong approximation of the network as an auxiliary result.

关键词： two-station queueing network the law of the iterated logarithm(LIL) strong approximation fluid approximation

Epidemiology of liver cirrhosis and associated complications:Current knowledge and future directions

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2022年第41期28卷 5910-5930页

作者： Yuan-Bin Liu ming-kai Chen Department of Gastroenterology Renmin Hospital of Wuhan UniversityWuhan 430000Hubei ProvinceChina

Cirrhosis causes a heavy global *** this review,we summarized up-todate epidemiological features of cirrhosis and its *** epidemiological studies reported an increase in the prevalence of cirrhosis in 2017 compared to in 1990 in both men and women,with 5.2 million cases of cirrhosis and chronic liver disease occurring in *** caused 1.48 million deaths in 2019,an increase of 8.1%compared to ***-adjusted life-years due to cirrhosis ranked 16th among all diseases and 7th in people aged 50-74 years in *** global burden of hepatitis B virus and hepatitis C virus-associated cirrhosis is decreasing,while the burden of cirrhosis due to alcohol and nonalcoholic fatty liver disease(NAFLD)is increasing *** described the current epidemiology of the major complications of cirrhosis,including ascites,variceal bleeding,hepatic encephalopathy,renal disorders,and *** also summarized the epidemiology of hepatocellular carcinoma in patients with *** the future,NAFLD-related cirrhosis will likely become more common due to the prevalence of metabolic diseases such as obesity and diabetes,and the prevalence of alcohol-induced cirrhosis is *** altered epidemiology should be clinically noted,and relevant interventions should be undertaken.

关键词： Causes Cirrhosis Complications Cost Epidemiology Burden Feature

Formation Energies and Electronic Structures of Native Defects in GaN

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1996年第11期13卷 867-869页

作者： XIE Jian-jun ZHANG kai-ming XIE Xi-de Department of Physics Fudan UniversityShanghai 200433

The electronic structures and the formation energies of native point defects in cubic GaN have been studied via the linear muffin-tin orbital *** results show that the nitrogen vacancy is the dominant defect in the intrinsic cubic *** the antisites and interstitial defects,it is found that a tetrahedral interstitial nitrogen atom surrounded by four Ga atoms NTGa is most easily formed,and the formation energy of NGaNGa antisite is much less than that of GaN *** changes of the density of states due to the introduction of defects are discussed.

关键词： GaN method cubic

Pricing in combinatorial double auction-based grid allocation model

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2009年第3期16卷 59-65页

作者： LI Li LIU Yuan-an LIU kai-ming MA Xiao-lei YANG ming Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

This article proposes a novel grid resource allocation model, in which the users and the grid service providers participate in the combinatorial double auction for the resource allocation. To obtain the detailed resource allocation status and the price information, a novel pricing algorithm is designed for the allocation model. Simulation results demonstrate that the proposed algorithm completes the resource allocation and pricing efficiently, and exhibits incentive compatible characteristic. Moreover, users with the higher average price and providers with the lower average price get compensation during the pricing process.

关键词： grid combinatorial double auction resource allocation pricing

Zr-Ti-Al-Fe-Cu bulk metallic glasses for biomedical device application

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第5期40卷 1239-1246页

作者： kai-ming Han Hui Jiang Ying-Min Wang Jian-Bing Qiang College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Materials Modification(Ministry of Education) Dalian University of TechnologyDalian 116024China

A series of Zr_(63.5-x)Ti_(x)Al_(9)Fe_(4.5)Cu_(23)(x=0,1.5,3.0,4.5,6.0;at%) bulk metallic glasses(BMGs) were designed and produced by means of copper mold suction *** effect of Ti addition on the glass-forming ability(GFA) and mechanical properties of Zr_(63.5-x)Ti_(x)Al_(9)Fe_(4.5)Cu_(23) alloys was first *** glassforming ability and room-temperature plasticity of BMGs increase first and then reduced with Ti content *** x=3.0,the Zr_(60.5)Ti_(3)Al_(9)Fe_(4.5)Cu_(23) BMG showed a critical glass formation diameter of 10 mm and excellent room-temperature compressive plasticity(εP=4.7%) by using the samples with dimensions of Φ3 mm × 6 ***,the BMG also showed better biocompatibility and biocorrosion resistance compared with Ti6 A14 V *** the imitated human body condition,the corrosion current density(Icorr) of BMG was 6.61 × 10^(-10) A·cm^(-2),which is two orders of magnitude lower than that of conventional Ti6Al4V ***,the CCD-986 sk cell viabilities are,respectively,65.4% and 46.6% on the BMG and Ti6 A14 V alloy,indicating better biocompatibility of *** Zr_(60.5)Ti_(3)Al_(9)Fe_(4.5)Cu_(23) BMG with larger GFA,excellent mechanical properties,biocompatibility and biocorrosion resistance is considered as a potential material in biomedical device fields.

关键词： Bulk metallic glasses Biomedical material Mechanical property Biocompatibility