检索结果-南通市图书馆

Validation of a Novel Meth.d for Cardiac Output Estimation by CT Coronary Angiograph.

Advances in Computed Tomograph. 2012年第2期1卷 11-16页

作者： hetal h. mehta Brian G. Ch.i Reza Sanai Raman S. Dusaj Amr Moh.en Ch.nlei Liang Jannet F. Lewis Robert K. Zeman Department of Mech.nical and Aerospace Engineering The George Washington University Washington DC USA Department of Medicine The George Washington University Washington DC USA Department of Radiology The George Washington University Washington DC USA

Background: Cardiac output can be estimated during retrospectively gated CT coronary angiograph. by anatomically determining left ventricular volumes;prospective triggering to minimize radiation precludes th.s meth.dology. We propose an alternative meth.d for cardiac output estimation based on preclinical models suggesting th.t cardiac output may be inversely related to contrast wash.ut from th. aortic root during timing bolus scanning, as measured by peak aortic root contrast attenuation. Meth.ds: 34 patients h.d CT coronary angiograph. timing bolus performed with.20 ml iodixanol at 5.5 ml/s followed by 20 ml normal saline at 5.5 ml/s th.ough.an 18-Ga antecubital cath.ter. Peak aortic root contrast attenuation was correlated to cardiac output calculated by ech.cardiograph. using h.art rate stroke volume from biplane Simpson’s ***: Mean age was 58 ± 13 years;body surface area, 2.0 ± 0.5 m2. 53% were women. Stroke volume, cardiac output and cardiac index were 67 ± 19 ml, 4.5 ± 1.6 L/min, and 2.2 ± 0.7 L/min/m2, respectively. Peak aortic root contrast attenuation was 207 ± 46 h. and correlated to cardiac output and cardiac index with.r = –0.64, p Conclusion: Th.s novel meth.d for cardiac output estimation by CTCA appears feasible. Th. CT ph.siologic parameters using th. timing test-bolus data moderately correlated with.ech.cardiograph.c assessment of cardiac output. Th. calculation of cardiac output adds important h.modynamic data to anatomic information provided by CTCA, and furth.r development of th.s meth.d may preserve assessment of left ventricular performance in prospective triggering.

关键词： Cardiac Output Coronary CT Angiograph. h.modynamics Prospective Triggering Validation

来源：

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

Effect of Tin Incorporation on Th.rmo-Mech.nical Properties of Glassy Se80Te20 Alloy

引用

Ch.nese Ph.sics Letters 2014年第3期31卷 115-117页

作者： h. Kumar A. Sh.rma N. mehta Department of Ph.sics Banaras Hindu University Varanasi 221005 India

We report an analysis on th. h.rdness beh.vior of glassy Se80？xTe20Snx alloy. Th. crucial th.rmo-mech.nical parameters （micro-h.rdness, volume and formation energy of micro-voids and th. modulus of elasticity） are examined. Th. results indicate th.t th. th.rmo-mech.nical parameters are ch.nged significantly after incorporation of Sn in glassy Se80Te20 alloy.

关键词： Alloys

来源：

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

New breakth.ough.Building non-markovian environments for single-qubit systems at any time interval

引用

Science Ch.na(Ph.sics,Mech.nics & Astronomy) 2025年

作者： h. Z. Sh.n Center for Quantum Sciences and Sch.ol of Ph.sics Northeast Normal University

Th. proposal of quantum simulation provides a h.gh.y effective approach.for experimental research.on open quantum systems. To date, numerous quantum simulation studies pertaining to open quantum systems h.ve been put forward,including Fanch.ni et al.’s simulation of a deph.sing noise ch.nnel utilizing an optical system[1], and Xiong et al.’s realization of a quantum simulation for a non-rotating-wave approximation noise ch.nnel, also leveraging an optical system[2].

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neuroinflammation as a th.rapeutic target in h.ntington's disease

引用

Neural Regeneration Research 2025年第3期20卷 817-818页

作者： Andrea Kwakowsky Th.lani h.Palpagama Center for Brain Research.and Department of Anatomy and Medical Imaging Faculty of Medical and Health SciencesUniversity of AucklandAucklandNew Zealand Ph.rmacology and Th.rapeutics School of MedicineGalway Neuroscience CentreUniversity of GalwayGalwayIreland

In 1872, George h.ntington presented h.s essay “On Ch.rea” to th. Meigs and Mason Academy of Medicine and, in doing so, detailed a disease th.t would later bear h.s name. h.ntington's disease(h.) is a genetic, neurodegenerative disease th.t manifests as th. loss of motor control,cognitive impairment,and mood and psych.atric ch.nges in paents.

关键词： h.ntington inflammation Medicine

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Glial response in th. midcingulate cortex in h.ntington’s disease

引用

Neural Regeneration Research 2025年第1期20卷 207-208页

作者： Th.lani h.Palpagama Andrea Kwakowsky Center for Brain Research.and Department of Anatomy and Medical Imaging Faculty of Medical and Health SciencesUniversity of AucklandAucklandNew Zealand Ph.rmacology and Th.rapeutics School of MedicineGalway Neuroscience CenterUniversity of GalwayGalwayIreland

h.ntington’s disease(h.)is a genetic disease ch.racterized by th. progressive degeneration of th. striatum and *** can present with.a variety of symptoms th.t can broadly be classified into motor symptoms,inclusive of ch.reatic movements and rigidity,mood and psych.atric symptoms,such.as depression and apath.,and cognitive symptoms,such.as cognitive *** causal mutation underlying h. results from an expansion of a CAG repeat sequence on th. IT15 gene,resulting in th. formation and accumulation of a mutant h.ntingtin protein.

关键词： h.ntington degeneration cortex

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Emission-Based Scatter Correction in SPECT Imaging

引用

Tsingh.a Science and Tech.ology 2010年第1期15卷 1-10页

作者： hetal Babla Rich.rd Conwell Digirad Corporation PowayCA 92064USA

Scatter correction in single ph.ton emission computed tomograph. （SPECT） h.s been focused on eith.r using multiple-window acquisition tech.ique or th. scatter modeling tech.ique in iterative image reconstruction. We propose a tech.ique th.t uses ：only th. emission data for scatter correction in SPECT. We assume th.t th. scatter data can be approximated by convolving th. primary data with.a scatter kernel followed by th. normalization using th. scatter-to-primary ratio （SPR）, Since th. emission data is th. superposition of th. primary data and th. scatter data, th. convolution normalization process approximately results in th. sum of th. scatter data and a convolved version of scatter data with.th. kernel. By applying a proper scaling factor, we can make th. estimation approximately equal to or less th.n th. scatter data anywh.re in th. projection domain. Ph.ntom and patient cardiac SPECT studies sh.w th.t using th. proposed emission-based scatter estimation can effectively reduce th. scatter-introduced background in th. reconstructed images. And additionally, th. computational time for scatter correction is negligible as compared to no scatter correction in iterative image reconstruction.

关键词： SPECT emission-based scatter correction iterative image reconstruction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparative ch.mical sensor for detection of ch.omium(Ⅵ) in aqueous solution

引用

Optoelectronics Letters 2025年第1期21卷 21-27页

作者： Sura h.AL-REKABI A.A.ALWAh.B Electrical Tech.ique Department Al Suwayrah Technical Institute Middle Technical University Laser and Optoelectronics Department University of Technology-Iraq

A process for purifying aqueous solutions containing h.avy and toxic metals such.as ch.omium（Cr） h.s been investigated. One of th. extremely h.rmful pollutants in rivers and seawater is th. h.avy metal ions due to th.ir direct impacts on h.man, animals and plants are h.xavalent Cr（Ⅵ）. Consequently, h.gh.y sensitive sensor to detect Cr is essential. Surface plasmon resonance（SPR） tech.ique h.s attracted h.ge research.interest in detecting h.avy metals specifically. In th.s study, th.ee types of prism-based SPR sensor, gold（Au）/silver（Ag）, Au/polyaniline（PANI） and Au/titanium dioxide（TiO2） nanostructured films, are investigated as potential sensing material to detect th. presence of Cr（Ⅵ） ions in water. Th. base Au layer with.th.ckness of 48.3 nm is deposited on a glass slide for all sensors. For Au/Ag, Au/PANI nanofibers and Au/TiO2sensor films, th. Cr（Ⅵ） concentration is varied from 1 ppm to 15 ppm with.sensitivity of 0.270 °ppm-1, 0.082 °ppm-1and 0.039 °ppm-1, respectively. Based on th.se results, th. Au/PANI nanofibers are th. most sensitive to Cr（Ⅵ） among th. tested sensing materials.

关键词： Titanium dioxide

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Does mesench.mal stem cell’s secretome affect spinal sensory circuits?Implication for pain th.rapies

引用

Neural Regeneration Research 2025年第1期20卷 181-183页

作者： Francesco Ferrini Esri h.Juárez Adalberto Merigh. Department of Veterinary Sciences University of TurinGrugliascoTOItaly Department of Psych.atry and Neuroscience UniversitéLavalQuébec CityQCCanada

Mesench.mal stem cells(MSCs)are multipotent adult stem cells of mesodermal origin th.t can be isolated from various tissues,including bone marrow,tooth.pulp,adipose tissue,and umbilical *** h.ve gained significant attention in regenerative medicine due to th.ir ability to modulate th. immune system and favor tissue *** enrich.th. medium in wh.ch.th.y are cultivated with.a broad range of bioactive molecules,including growth.factors,cytokines,ch.mokines,enzymes,nucleic acids,and extracellular vesicles th.t collectively compose th. MSC *** increasing number of pre-clinical studies suggest th.t delivering in vivo an MSC-conditioned medium(i.e.,th. medium collected from MSC cultures after at least 3 days of exposure)exerts neuroprotective and anti-inflammatory effects in a variety of neurological conditions.

关键词： protective clinical collective

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Management of alcoh.lic h.patitis:Current concepts

引用

World Journal of h.patology 2012年第12期4卷 335-341页

作者： hetal A Karsan Samir Parekh Atlanta Gastroenterology Associates Emory UniversityAtlantaGA 30342United States Emory University Liver Transplant Program AtlantaGA 30322United States

Alcoh.lic h.patitis is a devastating form of acute liver injury seen in ch.onic alcoh.l abusers with.significant morbidity and *** is a multisystem disease th.t is precipitated by ingesting large quantities of alcoh.l with.genetic and environmental factors playing a *** criteria h.ve been developed to predict disease severity and th.se criteria can serve as indicators to initiate medical *** th.rapy remains abstinence and supportive care,as continued alcoh.l abuse is th. most important risk factor for disease *** cornerstone of supportive care remains aggressive nutritional support,and alth.ugh.acute alcoh.lic h.patitis h.s been extensively studied,few specific medical th.rapies h.ve been *** remain th. most effective medical th.rapy available in improving sh.rt term survival in a select group of patients with.alcoh.lic h.patitis;h.wever,th. long-term outcome of drug th.rapies is still not entirely clear and furth.r clinical investigation is *** liver transplantation for acute alcoh.lic h.patitis h.ve demonstrated promising results,th.s practice remains controversial and h.s not been advocated universally,with.most transplant centers requiring a prolonged period of abstinence before considering *** liver support devices,alth.ugh.still experimental,h.ve been developed as a form of liver support to give additional time for liver *** h.ve th. potential for a significant th.rapeutic option in th. future for th.s unfortunately dreadful disease.

关键词： Alch.lic h.patitis Acute liver injury Abstinence Nutrition Corticosteroids Transplantation Extracorporeal liver support

来源：

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

Fractional delay compensated discrete-time SMC for networked control system

引用

Digital Communications and Networks 2017年第2期3卷 112-117页

作者： D.h. Sh.h.A.J. mehta Gujarat Tech.ological University Gujarat India Institute of Infrastructure Tech.ology Research.and Management Gujarat India

Time-varying network induced delay in th. communication ch.nnel severely affects th. performance of closed loop network control systems. In th.s paper, a novel idea of compensating th. fractional time varying communication delay in th. sliding Surface is presented. Th. fractional time delay in th. sensor to controller and controller to actuator ch.nnel is approximated using th. Th.ran approximation tech.ique to design th. sliding surface. A discrete-time sliding mode control law is derived using th. proposed surface th.t compensates fractional time delay in sensor to controller and controller to actuator ch.nnels for uncertain network control systems. Th. sufficient condition for closed loop stability of th. system is derived using th. Lyapunov function. Th. efficacy of th. proposed strategy is supported by th. simulation results.

关键词： Discrete-time sliding mode control Networked control Network delay

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：