检索结果-南通市图书馆

Impact of downwind sampling location and height on inverse-Gaussian dispersion modeling: A theoretical study

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 Agricultural and Biological Engineering 2012年第4期5卷 39-46页

作者： Heather w Jones Lingjuan wang-Li Behdad yazdani Boroujeni Department of Biological and Agricultural Engineering North Carolina State UniversityRaleighNC 27695-7625 USA

In the studies of fate and transport of air emissions from animal feeding operations,Gaussian based dispersion models have been commonly used to predict downwind pollutant concentrations through forward modeling approach,or to derive emission rates and emission factors through inverse dispersion modeling *** the Gaussian dispersion modeling process,downwind sampling location and sampling height could generate significant impact on accuracy of the model validation,or inverse modeling results based upon field *** study theoretically analyzed the impact of downwind locations and sampling height on Gaussian dispersion *** was discovered that the field sampling needs to be conducted at the locations beyond the plume touching-ground distance,at a downwind distance as short as 5 m for the case scenario with zero rise of emission plume under the atmospheric stability class C,or as long as 297 m for the case scenario with 15 m rise of emission plume under the atmospheric stability class *** order to measure the PM concentrations of the dispersion plume,the minimum sampling height at the locations within the plume touching-ground distance varied from ground level to as high as almost 14 m,whereas for the locations beyond the plume touching-ground distance,a sampling height of ground level would be acceptable.

关键词： animal feeding operations Gaussian dispersion modeling downwind distance downwind sampling location downwind sampling height

PROCOAGULANT EFFECTS OF THROMBOLyTICTHERAPy IN ACUTE MyOCARDIAL INFARCTION

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 Medical Sciences Journal 2002年第1期17卷 36-39页

作者： wang y Liu Q Zhu J yuan Z Ma X Department of Cardiology the First Hospital Xi''an Jiaotong University Xi''an 710061

To examine the procoagulant effects of thrombolytic agent on h emostasis and study the role of hemostatic markers as predictors of clinical outcomes. Methods. In the present study, eighteen patients with acute myocardial in farction(AMI) received 1.5 or 2.0 million U nonspecific urokinase(UK), or 70～80 mg fibrin specific recombinant tissue plasminogen activator(rt PA)and did not use heparin until 8 hours after intravenous injection of the above agents. Eig ht patients with AMI and without thrombolytic therapy were enrolled as controls. Coagulant and thrombolytic activity markers included thrombin antithrombin Ⅲ complex (TAT), D dimer, fibrinogen (Fg), FMPV/Amax. All markers were determined before,immediately,1,2,4 and 8 hours after the administration of thrombolytic a gents respectively. Results. Molecular marker of thrombin generation——TAT showed an activated coa gulant state immediately after thrombolytic therapy. Level of TAT showed no sign ificant changes between every two observed phases in controls. However, level of TAT increased significantly from 4.95±1.75μg/L ( 4.63±1.37μg/L) to 14.71±3 .31μg/L ( 14.25±2.53μg/L) before and immediately after administration of thro mbolytic agents UK(or rt PA). There was significant difference between level of serum TAT of patients with and without thrombolytic therapy (Pwer TAT level than those failing in thromb olytic therapy, and higher FMPV/Amax level than controls. D dimer, a surrogate of thrombolytic activity increased markedly and Fg significantly declined afte r thrombolytic therapy(Pysis induced by thrombolytic therapy. Both urokinase and rt PA had procoagul ant action. This transient activation of the coagulant system might contribute t o early reocclusion. These data provided the theoretical support for simultaneou s administration of antico

关键词： acute myocardial infarction thrombolysis urokinase rt PA

在线全文

学校读者我要写书评

暂无评论

耳聋基因TMC同源基因的重大研究进展

中国科学：生命科学 2018年第6期48卷 707-708页

作者：张伟胡宇飞清华大学生命科学学院北京100084

机械感受如触觉、听觉、本体感受等感觉信息对于调控生物体的行为具有至关重要的意义.近年来,越来越多的研究发现机械感受离子通道或蛋白对于维持机体正常生命活动极其重要.很多机械感受受体在体内分布广泛,在不同的组织中可发挥着不同... 详细信息

机械感受如触觉、听觉、本体感受等感觉信息对于调控生物体的行为具有至关重要的意义.近年来,越来越多的研究发现机械感受离子通道或蛋白对于维持机体正常生命活动极其重要.很多机械感受受体在体内分布广泛,在不同的组织中可发挥着不同的功能（如Nomp C与piezo）.在听觉传导中.

关键词：同源基因耳聋感觉信息体内分布生命活动离子通道感受机械

ON THE EFFECT OF THE NONPARALLELISM OF THE BOUNDARy LAyER FLOw OVER A FLAT PLATE ON ITS STABILITy CHARACTERISTICS

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 1986年第3期2卷 193-205页

作者： X.y.yu H.Zhou(Tianjin University) 1. Tianjin University Tianjin China

The effect of the nonparallelism of the boundary layer flow over a flat plate on its stabilitycharacteristics has been investigated by several authors,and it was claimed that the results of thetheoretical calculations are already in good agreement with the experimental ***,this is not *** this paper,this problem is reinvestigated,using two different *** is foundthat within the framework of linear theory,the theoretical results are in fact not in good agreement withthe experimental *** settle this problem,nonlinear effect must be taken intoconsideration.

关键词： stability neutral curve nonparallelism of the boundary layer flow quas-parallel flow

Design of precision acquisition system for precision power supply of photon source

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2021年第4期5卷 586-593页

作者： P.Liu F.L.Long y.Z.Du Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Purpose Photon source has developed to the fourth *** requirements for beam stability and power supply output current stability have been greatly *** this paper,a precision acquisition system is designed for improving the stability for power supply output *** The acquisition system consists of two parts,the analog to digital converter(ADC)system and the temperature control *** composition and software simulation analysis are given in this *** A prototype is made and *** test results showed that the acquisition system has an effective resolution of 15.5 bits,signal-to-noise ratio(SNR)of 98 dB,and integral nonlinearity(INL)of 86 *** internal temperature stable range is±0.06℃.Conclusions The acquisition system can fully meet the requirements of the developed photon source.

关键词： Photon source Beam stability High precision Digital temperature control SNR

A laterally graded junctionless transistor

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 Semiconductors 2014年第3期35卷 29-32页

作者： Punyasloka Bal Bahniman Ghosh Partha Mondal M.w.Akram Department of Electrical Engineering Indian Institute of Technology Kanpur Microelectronics Research Center 10100 Burnet Road University of Texas at Austin

This paper proposes a laterally graded junctionless transistor taking peak doping concentration near the source and drain region, and a gradual decrease in doping concentration towards the center of the channel to improve the I OFF and I ON/I OFF ratio. The decrease of doping concentration in the lateral direction of the channel region depletes a greater number of charge carriers compared to the uniformly doped channel in the OFF-state,which in turn suppresses the OFF state current flowing through the device without greatly affecting the ON state current.

关键词： junctionless field effect transistor laterally graded subthreshold slope

CONTACT MATERIALS FOR GaSb AND InSb: A PHASE DIAGRAM APPROACH

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2002年第2期15卷 143-148页

作者： K. w. Richter and H. Ipser Institut für anorganische Chemie, Universit?t wien w?hringerstrasse 42, A-1090 Vienna, Austria Institut für anorganische Chemie Universitat Wien Wathringerstrasse 42A-1090 ViennaAustria

The development of well defined and thermally stable ohmic contacts for Ⅲ- Ⅴ semi-conductors like InSb and GaSb is still a challenging problem in semiconductor devicetechnology. As device processing usually includes the exposure to elevated tempera-tures, interface reactions often occur during metallization and further heat *** is thus important to understand the respective phase equilibria of the involved el-ements. From the thermodynamic point of view, binary and ternary compounds inequilibrium with the respective compound semiconductor would be the best choice forcontact materials as these contacts will be stable even after long exposure to elevatedtemperatures. These possible candidates for contact materials may be directly obtainedfrom the phase *** the last years we investigated several phase diagrams of transition metals withGaSb and InSb. Experimental results in the systems Ga-Ni-Sb, Ga-Pd-Sb, Ga-Pt-Sb,In-Ni-Sb and In-Pd-Sb are summarized and are discussed in the context of contactchemistry.

关键词： contact material phase diagram GaSb InSb

HARDENING OF L1_2-ORDERED Co_3Ti By PRECIPITATION OF FCC-Co PHASE

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1998年第1期11卷 33-38页

作者： w.H.Tian S.L.Hu M.Nemoto Univ of Science and Technology Beijing Beijing China

The Co3 Ti phase hardens appreciably by the fine precipitation of disordered fcc Co-rich phase upon aging after quenching from solution annealing temperature. Transmission electron microscope (TEM)observations revealed that the precipitates are platelet in shape, lying nearly parallel to the {100} planes of the L12-ordered matrix, and perfectly coherent with the matrix lattice at the beginning of aging. The high temperature strength increases appreciably with the fine precipitation of disondered Co-rich phase over the whole temperature range investigated. TEM observations of the deformed alloys after underaging revealed that saperdislocations are pinned by precipitates indicating an attractive interaction between dislocations and precipitates.

关键词： Co_3 Ti age-hardening precipitate deformation mechanism microstructure

Vectorcardiographic QRS area as a predictor of response to cardiac resynchronization therapy

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2022年第1期19卷 9-20页

作者： Mohammed A Ghossein Antonius Mw van Stipdonk Frits w Prinzen Kevin Vernooy Department of Physiology Cardiovascular Research Institute Maastricht(CARIM)Maastricht UniversityMaastrichtThe Netherlands Department of Cardiology Cardiovascular Research Institute Maastricht(CARIM)Maastricht University Medical CenterMaastrichtThe Netherlands Department of Cardiology Radboud University Medical CentreNijmegenThe Netherlands

Cardiac resynchronization therapy(CRT)is a good treatment for heart failure accompanied by ventricular conduction *** ECG criteria in international guidelines seem to be suboptimal to select heart failure patients for *** criteria QRS duration and left bundle branch block(LBBB)QRS morphology insufficiently detect left ventricular activation delay,which is required for benefit from ***,there are various definitions for LBBB,in which each one has a different association with CRT benefit and is prone to subjective *** studies have shown that the objectively measured vectorcardiographic QRS area identifies left ventricular activation delay with higher accuracy than any of the current ECG ***,various studies have consistently shown that a high QRS area prior to CRT predicts both echocardiographic and clinical improvement after *** beneficial relation of QRS area with CRT-outcome was largely independent from QRS morphology,QRS duration,and patient characteristics known to affect CRT-outcome including ischemic etiology and *** top of QRS area prior to CRT,the reduction in QRS area after CRT further improves *** area is easily obtainable from a standard 12-lead ECG though it currently requires off-line *** applicability will be significantly improved when QRS area is automatically determined by ECG equipment.

关键词： ventricular synchronization conduction