检索结果-南通市图书馆

A wideband fast multipole boundary element method for half-space/plane-symmetric acoustic wave problems

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2013年第2期29卷 219-232页

作者： Chang-Jun zheng hai-Bo Chen Lei-Lei Chen Department of Modern Mechanics University of Science and Technology of China

This paper presents a novel wideband fast multipole boundary element approach to 3D half-space/planesymmetric acoustic wave *** half-space fundamental solution is employed in the boundary integral equations so that the tree structure required in the fast multipole algorithm is constructed for the boundary elements in the real domain ***,a set of symmetric relations between the multipole expansion coefficients of the real and image domains are derived,and the half-space fundamental solution is modified for the purpose of applying such relations to avoid calculating,translating and saving the multipole/local expansion coefficients of the image *** wideband adaptive multilevel fast multipole algorithm associated with the iterative solver GMRES is employed so that the present method is accurate and efficient for both lowand high-frequency acoustic wave *** for exterior acoustic problems,the Burton-Miller method is adopted to tackle the fictitious eigenfrequency problem involved in the conventional boundary integral equation *** on the implementation of the present method are described,and numerical examples are given to demonstrate its accuracy and efficiency.

关键词： Helmholtz equation·Boundary element method·Half-space/plane-symmetric problem·Wideband fast multipole method·Noise barrier

In silico screening of Chinese herbal medicines with the potential to directly inhibit 2019 novel coronavirus

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Medicine 2020年第2期18卷 152-158页

作者： Deng-hai Zhang Kun-lun Wu Xue Zhang Sheng-qiong Deng Bin Peng Shanghai Health Commission Key Lab of Artificial Intelligence(AI)-Based Management of Inflammation and Chronic Diseases Sino-French Cooperative Central LabShanghaiPudong Gongli HospitalSecondary Military Medical UniversityShanghai 200135China Department of Traditional Chinese Medicine Shanghai Pudong Gongli HospitalSecondary Military Medical UniversityShanghai 200135China Department of Research Affair Management Shanghai Pudong Gongli HospitalSecondary Military Medical UniversityShanghai 200135China

Objective: In this study we execute a rational screen to identify Chinese medical herbs that are commonly used in treating viral respiratory infections and also contain compounds that might directly inhibit 2019 novel coronavirus(2019-nCoV), an ongoing novel coronavirus that causes ***: There were two main steps in the screening process. In the first step we conducted a literature search for natural compounds that had been biologically confirmed as against sever acute respiratory syndrome coronavirus or Middle East respiratory syndrome coronavirus. Resulting compounds were cross-checked for listing in the Traditional Chinese Medicine Systems Pharmacology *** meeting both requirements were subjected to absorption, distribution, metabolism and excretion(ADME) evaluation to verify that oral administration would be effective. Next, a docking analysis was used to test whether the compound had the potential for direct 2019-nCoV protein *** the second step we searched Chinese herbal databases to identify plants containing the selected compounds. Plants containing 2 or more of the compounds identified in our screen were then checked against the catalogue for classic herbal usage. Finally, network pharmacology analysis was used to predict the general in vivo effects of each selected ***: Of the natural compounds screened, 13 that exist in traditional Chinese medicines were also found to have potential anti-2019-nCoV activity. Further, 125 Chinese herbs were found to contain 2 or more of these 13 compounds. Of these 125 herbs, 26 are classically catalogued as treating viral respiratory infections. Network pharmacology analysis predicted that the general in vivo roles of these26 herbal plants were related to regulating viral infection, immune/inflammation reactions and hypoxia ***: Chinese herbal treatments classically used for treating viral respiratory infection might contain direct anti-2019-nCoV compounds.

关键词： 2019-nCoV Wuhan coronavirus Drugs Chinese herbal Pneumonia Natural compounds Molecular docking Network pharmacology

Isolated hepatic tuberculosis associated with portal vein thrombosis and hepatitis B virus coinfection:A case report and review of the literature

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第30期9卷 9310-9319页

作者： Shu-Mei zheng Ning Lin Shan-Hong Tang Jia-Yi Yang hai-qiong Wang Shu-Lan Luo Yong Zhang Dong Mu Department of Gastroenterology and Hepatology The General Hospital of Western Theater CommandChengdu 610083Sichuan ProvinceChina Department of Clinical Nutrition The General Hospital of Western Theater CommandChengdu 610083Sichuan ProvinceChina School of Medical Imaging Nanjing Medical UniversityNanjing 211166Jiangsu ProvinceChina

BACKGROUND While tuberculosis(TB)itself is a common disease,isolated TB of the liver is a rare *** involvement of the liver is more commonly a part of a disseminated disease of the hepatic *** contrast,isolated hepatic TB spread through the portal vein from the gastrointestinal tract is seldom encountered in clinical practice,with only a few sporadic cases and short series available in the current *** complications,such as portal vein thrombosis(PVT),have rarely been reported *** SUMMARY A 22-year-old man was hospitalized with complaints of a 3-mo history of fever and weight loss of approximately 10 *** had a 10-year hepatitis B virus(HBV)infection in his medical ***-enhanced computed tomography(CECT)confirmed hepatosplenomegaly,with hypodensity of the right lobe of the liver and 2.1 cm thrombosis of the right branch of the portal vein.A liver biopsy showed epithelioid granulomas with a background of caseating *** staining showed acid-fast bacilli within the *** patient was diagnosed with isolated hepatic TB with ***-TB therapy(ATT),including isoniazid,rifapentine,ethambutol,and pyrazinamide,was *** with ATT,the patient was treated with entecavir as an antiviral medication against HBV and dabigatran as an *** remained asymptomatic,and follow-up sonography of the abdomen at 4 mo showed complete resolution of the *** Upon diagnosis of hepatic TB associated with PVT and HBV coinfection,ATT and anticoagulants should be initiated to prevent subsequent portal *** therapy against HBV should also be administered to prevent severe hepatic injury.

关键词： Hepatic tuberculosis Portal vein thrombosis Hepatitis B virus Case report

Upconversion Luminescence of SrTiO3：Er^3＋ Ultrafine Powders Produced by 785 nm Laser

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 Journal of Chemical Physics 2008年第3期21卷 233-238页

作者： hai Guo Yan-min Qiao Ju-fang zheng Lei-hong Zhao Department of Physics Zhejiang Normal University Jinhua 321004 China Zhejiang Key Laboratory for Reactive Chemistry on 5olicl Surfaces Institute of Physical Chemistry Zhejiang Normal University Jinhua 321004 China

Er^3＋ doped SrTiO3 ultrafine powders were prepared by solid state reaction in a molten NaCl flux. The structural properties were characterized by X-ray diffraction, field emission scanning electron microscopy, and Fourier transform infrared spectroscopy. The Stokes emission spectra of Er^3＋ in SrTiO3：Er^3＋ ranging from green to near infrared region were investigated under 514.5 nm laser excitation. The green and red upconverted luminescence spectra of Er^3＋ were measured under excitation into the 419/2 level by 785 nm laser. The upconversion mechanisms were studied in detail through laser power dependence and Er^3＋ ion concentration dependence of upconverted emissions, and results show that excited state absorption and energy transfer process are the possible mechanisms for the upconversion. The upconversion properties indicate that SrTiO3：Er^3＋ may be used in upconversion phosphors.

关键词： SrTiO3 Upconversion luminescence Excited state absorption Energy transfer

Tunable luminescence and energy transfer in Y_(2)BaAl_(4)SiO_(12):Tb^(3+),Eu^(3+)phosphors for solid-state lighting

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

Journal of Rare Earths 2021年第3期39卷 284-290,I0002页

作者： Jie Wang Xiusha Peng Danzhao Cheng Zhigang zheng hai Guo Department of Physics Zhejiang Normal UniversityJinhua 321004China

Single-phase Y_(2)BaAl_(4)SiO_(12):Tb^(3+),Eu^(3+)phosphors with adjustable luminescence were successfully prepared by high-temperature solid-state reaction *** structural,luminescent properties and ene rgy transfer(ET) process of Y_(2)BaAl_(4)SiO_(12):Tb^(^(3+)),Eu^(3+)phosphors were syste matically analyzed with the help of X-ray diffraction(XRD),scanning electron microscopy(SEM),excitation spectra,emission spectra and photoluminescence decay *** luminescence ranging from green through yellow and definitively to red can be achieved by elevating amounts of Eu^(3+)ions in Tb^(3+),Eu^(3+)co-doped ***,the ET mechanism and efficiency were also analyzed and the maximum ET efficiency is 67%.All the results show that Y_(2)BaAl_(4)SiO_(12):Tb^(3+),Eu^(3+)phosphors can be used in solid-state lighting.

关键词： Single-phase phosphors Y_(2)BaAl_(4)SiO_(12) Energy transfer Rare earths

ReCSA:a dedicated sort accelerator using ReRAM-based content addressable memory

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2023年第2期17卷 1-13页

作者： Huize LI hai JIN Long zheng Yu HUANG Xiaofei LIAO National Engineering Research Center for Big Data Technology and System Services Computing Technology and System LabClusters and Grid Computing LabSchool of Computer Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China

With the increasing amount of data,there is an urgent need for efficient sorting algorithms to process large data *** sorting algorithms have attracted much attention because they can take advantage of different hardware's *** the traditional hardware sort accelerators suffer“memory wall”problems since their multiple rounds of data transmission between the memory and the *** this paper,we utilize the in-situ processing ability of the ReRAM crossbar to design a new ReCAM array that can process the matrix-vector multiplication operation and the vector-scalar comparison in the same array *** this designed ReCAM array,we present ReCSA,which is the first dedicated ReCAM-based sort *** hardware designs,we also develop algorithms to maximize memory utilization and minimize memory exchanges to improve sorting *** sorting algorithm in ReCSA can process various data types,such as integer,float,double,and *** also present experiments to evaluate the performance and energy efficiency against the state-of-the-art sort *** experimental results show that ReCSA has 90.92×,46.13×,27.38×,84.57×,and 3.36×speedups against CPU-,GPU-,FPGA-,NDP-,and PIM-based platforms when processing numeric data *** also has 24.82×,32.94×,and 18.22×performance improvement when processing string data sets compared with CPU-,GPU-,and FPGA-based platforms.

关键词： ReCAM parallel sorting architecture design processing-in-memory

Digitizer of astronomical plates at Shanghai Astronomical Observatory and its performance test

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2017年第3期17卷 67-76页

作者： Yong Yu Jian-hai Zhao zheng-Hong Tang zheng-Jun Shang Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China

Before CCD detectors were widely employed in observational astronomy, the main method of detection was the use of glass astrophotographic plates. Astronomical plates have been used to record information on the position and activity of celestial bodies for more than 100 years. There are about 30 000 astronomical plates in China, and the digitization of astronomical plates is of great significance for permanent preservation and to make full use of these valuable observation data. A digitizer with high precision and high measuring speed is a key piece of equipment for carrying out the task of dig- itizing these astronomical plates. A digitizer for glass astrophotographic plates was developed jointly by Shanghai Astronomical Observatory and Nishimura Co., Ltd of Japan. The digitizer＇s hardware was manufactured by Nishimura Co., Ltd, and the performance test, error corrections as well as image pro- cessing of the digitizer were carried out by Shanghai Astronomical Observatory. The main structure and working mode of the digitizer are introduced in this paper. A performance test shows that brightness uniformity of illumination within the measuring area is better than 0.15%, the repeatability of digitized positions is better than 0.2 μm and the repeatability of digitized brightness is better than 0.01 instrumen- tal magnitude. The systematic factors affecting digitized positions, such as lens distortion, the actual optical resolution, non-linearity of guide rails, non-uniformity of linear motors in the mobile platform, deviation of the image mosaic, and non-orthogonality between the direction of scanning and camera lin- ear array, are calibrated and evaluated. Based on an astronomical plate with a size of 300 mm × 300 mm, which was digitized at different angles, the conversion residuals of positions of common stars on dif- ferent images were investigated. The results show that the standard deviations of the residuals are better than 0.9μm and the residual distribution is al

关键词： astrometry - instrumentation detectors - methods data analysis - techniques imageprocessing

A review on liquid sloshing hydrodynamics

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2021年第6期33卷 1089-1104页

作者： Jin-hai zheng Mi-An Xue Peng Dou Yu-meng He Key Laboratory of Coastal Disaster and Protection of Ministry of Education Hohai UniversityNanjing 210024China College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210024China

Liquid sloshing in tanks is a very complex nonlinear free surface fluid flow problem,which must be considered in most of the marine engineering problems such as naval architecture,offshore engineering and so *** liquid sloshing in large containers can damage the tank structure due to the direct liquid impacting *** also affects the capsizing process of the liquid cargo *** works on mitigating sloshing by using all kinds of the baffles were thus followed with *** layers with thinner thickness were shown to reduce the sloshing load of water in *** sloshing characteristics in tanks with different sizes were different,therefore,scaling effect of sloshing should also be *** in a tank can also be used as tuned liquid dampers(TLDs)to dampen wind,wave and flow-induced motions of floating or fixed marine *** paper present an overview on recent advances of liquid sloshing hydrodynamics including sloshing mitigation by using anti-sloshing baffle,layered fluids sloshing,scaling effect of sloshing and TLDs.

关键词： Sloshing mitigation layered fluids sloshing scaling effect of sloshing tuned liquid damper

Shadow glass transition as a thermodynamic signature of β relaxation in hyper-quenched metallic glasses

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

National Science Review 2020年第12期7卷 1896-1905页

作者： Qun Yang Si-Xu Peng zheng Wang hai-Bin Yu Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and Technology Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University

One puzzling phenomenon in glass physics is the so-called ’shadow glass transition’ which is an anomalous heat-absorbing process below the real glass transition and influences glass ***,it has yet to be entirely characterized,let alone fundamentally *** calorimetry detects it in limited heating ***,with the chip-based fast scanning calorimetry,we study the dynamics of the shadow glass transition over four orders of magnitude in heating rates for 24 different hyper-quenched metallic *** present evidence that the shadow glass transition correlates with the secondary(β)relaxation:(i) The shadow glass transition and the β relaxation follow the same temperature–time dependence,and both merge with the primary relaxation at high temperature.(ii) The shadow glass transition is more obvious in glasses with pronounced β relaxation,and vice versa;their magnitudes are proportional to each *** findings suggest that the shadow glass transition signals the thermodynamics of β relaxation in hyper-quenched metallic glasses.

关键词： metallic glass secondary relaxation shadow glass transition fast scanning calorimetry