检索结果-南通市图书馆

直接血管成形术中行冠状动脉内血栓抽吸切除术对ST段抬高型前壁心肌梗死患者左室重构的影响

世界核心医学期刊文摘（心脏病学分册） 2006年第11期2卷 47-47页

作者： De Luca L. Sardella G. davidson c.J. 杜媛 Department of cardiovascular and Respiratory Sciences La Sapienza University Policlinico Umberto I Viale del Policlinico 155 00100 Rome Italy Dr.

Objective: To evaluate prospectively the impact on left ventricular(LV) remodelling of an intracoronary aspiration thrombectomy device as adjunctive therapy in primary percutaneous coronary intervention(PcI) in patients with anterior ST elevation myocardial infarction(STEMI). Methods: 76 consecutive patients with anterior STEMI(65.3(11.2) years, 48 men) were randomly assigned to intracoronary thrombectomy and stent placement(n=38) or to conventional stenting(n=38) of the infarct related artery. Each patient underwent transthoracic echocardiography immediately after PcI and at six months. At the time of echocardiographic control, major adverse cardiovascular events(MAcE) in terms of death, new onset of myocardial infarction, and hospitalisation for heart failure were also evaluated. Results: After a successful primary PcI, patients in the thrombectomy group achieved a higher rate of post-procedure myocardial blush grade 3(36.8%v 13.1%, p=0.03) and effective ST segment resolution at 90 minutes(81.6%v 55.3%, p=0.02). Six months after the index intervention, 19 patients(26.8%) developed LV dilatation, defined as an increase in end diastolic volume(EDV) ≥20%: 15 in the conventional group and four in the thrombectomy group(p=0.006). Accordingly, at six months patients treated conventionally had significantly higher end systolic volumes(82(7.7) ml v 75.3(4.9) ml, pctomy. No differences in cumulative MAcE were observed(10.5%in the conventional group v 8.6%in the thrombectomy group, not significant). conclusion: compared with conventional stenting, adjunctive aspiration thrombectomy in successful primary PcI seems to be associated with a significantly lower incidence of LV remodelling at six months in patients with anterior STEMI.

关键词：前壁心肌梗死 ST段抬高左室重构血管成形术切除术梗死相关动脉经胸超声心动图收缩末容积舒

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

Study on the early surface films formed on Mg-Y molten alloy in different atmospheres

引用

Journal of Magnesium and Alloys 2015年第3期3卷 173-179页

作者： A.R.Mirak c.J.davidson J.A.Taylor cAST cRc School of Mechanical and Mining EngineeringThe University of QueenslandBrisbaneQLD 4072Australia cAST cRc CSIRO Materials Science and EngineeringP.O.Box 883KenmoreQLD 4069Australia

In the present study,the non-isothermal early stages of surface oxidation of liquid Mg-1%Y alloy during casting were studied under UPH argon,dry air,and air mixed with protective fluorine-bearing *** chemistry and morphology of the surface films were characterized by SEM and EDX *** results indicate a layer of smooth and tightly coherent oxidation film composed of MgO and Y_(2)O_(3) formed on the molten Mg-Y alloy surface with 40-60 nm thickness under dry air.A dendritic/cellular microstructure is clearly visible with Y-rich second phases gathered in surface of the melt and precipitated along the grain/cell boundaries under all gas *** fluorine-bearing gas mixtures,the surface film was a mixed oxide and fluoride and more even;a flat and folded morphology can be seen under SF6 with oxide as dominated phase and under 1,1,1,2-tetra-fluoroethane,a smooth and compact surface film uniformly covering the inner surface of the bubble with equal oxide and fluoride thickness,which results in a film without any major ***_(2) phase appears to be the key characteristic of a good protective film.

关键词： Mg-Y alloy SEM EDX Early surface film Oxidation Fluoridation

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

Synthesis of a copper(Ⅱ) oxide–montmorillonite composite for lead removal

引用

International Journal of Minerals,Metallurgy and Materials 2019年第7期26卷 803-810页

作者： davidson E. Egirani Nanfe R. Poyi Napoleon Wessey Faculty of Science Niger Delta University Wilberforce Island Nigeria Nigerian Institute of Mining and Geosciences Jos Nigeria

The synthesis of a copper(II) oxide–montmorillonite composite and its application in the removal of lead(II) ions in solution were investigated. The Acros Organics (AcOR) montmorillonite was activated using potassium hydroxide solution. The activated AcOR montmorillonite was titrated with copper(II) nitrate solution to produce the copper(II) oxide–montmorillonite composite. Adsorption experiments were conducted using batch-mode techniques under reducing conditions at ambient temperature. The reaction mechanism indicated a higher proton coefficient, greater intraparticle diffusion, and higher mass transfer rates compared with those achieved with bare montmorillonite. The intraparticle diffusion constant derived from the slope was 2.93^-3 (mg·g^–1·min^–0.5), and the intercept c was 9.86,≠ 0. In the presence of a cuO coating, the adsorption efficiency was 85.55% at pH 4 and 89.62% at pH 7. Therefore, the copper(II) oxide-montmorillonite composite, as a novel adsorbent with a very high adsorption capacity, exhibited substantially enhanced adsorption of Pb^2+ ions compared with bare montmorillonite.

关键词： activation adsorption kinetics aging coatings copper oxide montmorillonite

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

Magnetic resonance studies of a gas-solids fluidised bed:Jet-jet and jet-wall interactions

引用

Particuology 2010年第6期8卷 617-622页

作者： Meenal Pore Daniel J.Holland Thusara c.chandrasekera christoph R.Müller Andrew J.Sederman John S.Dennis Lynn F.Gladden John F.davidson Department of chemical Engineering and Biotechnology University of CambridgePembroke StreetCambridgeCB2 3RAUK Department of Mechanical and Process Engineering ETH ZurichSonneggstrasse 38092 ZurichSwitzerland

Magnetic resonance imaging （MRI） gave images of air jets from orifices in the distributor plate of a bed of poppy seeds. Attention focused on two features：（1） The interaction between nearby vertical jets from two, three or four orifices; （2） Wall effects, where one or more orifices created vertical jets near the vertical wall of the cylinder containing the particle bed. The results show that nearby jets are mutually attracted. Likewise a jet near a wall bends out of the vertical, towards the wall, For multiple adjacent jets, the jet lengths show dependence on orifice layout： the lengths are in reasonable agreement with published measurements, by other methods, for single jets. The MRI gives three-dimensional images of the single jets and of multiple jets, separate or merging.

关键词： Fluidised bed MRI Jets Distributor design

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

粉末冶金Al-5.6Zn-2Mg合金在热压缩过程中加工硬化特性及本构模型的比较（英文）

引用

Journal of central South University 2024年第2期 346-368页

作者： KATIKA Harikrishna DAMODA R.K. davidson M.J. SEETHARAM R. KASAGANI Veera Venkata Nagaraju Department of Mechanical Engineering National Institute of Technology Department of Mechanical Engineering The Indian Institute of Information Technology Design and Manufacturing

在300～5000℃、应变速率为0.1～0.0001 s-1的条件下,在万能试验机上对Al-5.6Zn-2Mg铝合金进行热压缩试验,以确定动态再结晶开始时的加工硬化速率曲线σc(εc)以及关键特征σc(εc)、σp(εp)和σss与Z系数之间的相关性。使用了四个本... 详细信息

在300～5000℃、应变速率为0.1～0.0001 s-1的条件下,在万能试验机上对Al-5.6Zn-2Mg铝合金进行热压缩试验,以确定动态再结晶开始时的加工硬化速率曲线σc(εc)以及关键特征σc(εc)、σp(εp)和σss与Z系数之间的相关性。使用了四个本构模型,Arrhenius模型、改进的Johnson-cook模型(MJc)、改进的Zerilli-Armstrong模型(MZA)和开发的人工神经网络(ANN)。结果表明,ANN型模型和Arrhenius模型的相对误差的绝对平均值最低,分别为0.486%和3.36%,MZA型模型和MJc型模型的相对误差的绝对平均值较高,分别为8.84%和3.93%。由于Arrhenius模型能够处理各种因素之间的非线性关系,因此它被认为是最合适的预测模型,但在材料性质未知或实验数据有限的情况下,MJc模型可能是一种更简单的替代方法。MZA模型不适合估计热压缩时的流变应力。此外,训练最好的神经网络模型的预测性能最好,相对误差的绝对平均值为0.486%,R值为0.99。

关键词：加工硬化速率曲线本构建模热压缩 EBSD分析流变曲线

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

Time for a reset and recalibration: Healthcare in the post cOVID era

引用

International Journal of Nursing Sciences 2021年第2期8卷 143-144页

作者： Patricia M.davidson Michelle Patch Johns Hopkins School of Nursing 525 N.Wolfe StreetBaltimoreMD21205USA

Severe Acute Respiratory Syndrome coronavirus 2(SARS-coV-2),the virus that causes coronavirus disease 2019(c0VID-19),has changed the world forever,accelerating a myriad of ***-19 has sent shock waves around the world and there is almost no dimension of our lives that has not been touched by the pandemic's *** society has been ravaged by pandemics over centuries,it is the 1918 influenza pandemic that provides us with recent learning and guideposts for what the future will look like[1].

关键词： Acute cOV calibration

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

100-Gb/s undersea transmission with high spectral efficiency using pre-filtered QPSK modulation format

引用

chinese Optics Letters 2010年第9期8卷 831-836页

作者： J.-X. cai Y. cai c. R. davidson D. G. Foursa A. Lucero O. Sinkin W. Patterson A. Pilipetskii G. Mohs Neal S. Bergano Tyco Electronics Subsea communications LLc ("TE Subcom" formerly known as ~co Telecommunications (US) Inc.) 250 Industrial Way West Eatontown NJ 07724 USA

We provide a review of our recent 100-Gb/s, high spectral efficiency （SE） experiment targeting transoceanic and regional undersea transmission distances. We demonstrated that simple pre-filtering at the transmitter together with a maximum a posteriori probability （MAP） detection algorithm can significantly improve SE. We transmitted 96×100-Gb/s pre-filtered polarization division multiplexed return-to-zero quadrature phase shift keyed （PDM-RZ-QPSK） channels with 300% SE over 10608 km using 52-km spans of 150-μm 2 fiber and simple single-stage erbium-doped fiber amplifiers （EDFAs）. We also achieved 400% SE over 4368 km using similar techniques.

关键词： Bit error rate Erbium doped fiber amplifiers Modulation Optical signals Quadrature phase shift keying Signal processing

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

ASIA AND THE DISPERSAL OF PRIMATES

引用

地质学报 1925年第2期 136-196页

作者： davidson BLAcK Department of Anatomy P. U. M. c

INTRODUcTION. A great deal of attention has recently been paid to problems pertaining to the biological and geological history of Asia and in no part of the continent has a knowledge of its fauna and structure both past and present been advanced more widely during the past decade than in that comprising china and Mongolia. This fortunate circumstance has not been brought about

关键词： fauna fossil genera continent Tertiary numerous circumstance Middle Permian Himalayan

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

PRELIMINARY NOTIcE OF THE DIScOVERY OF AN ADULT SINANTHROPUS SKULL AT cHOU KOU TIEN

引用

地质学报 1929年第3期 214-218+220-246页

作者： davidson BLAcK cenozoic Laboratory Geological Survey of china

On the second of December 1929 Mr. W. c. Pei of the staff of the cenozoic Laboratory of the Geological Survey of china, while excavating a sheltered recess of the main deposit (Locality 1) at chou Kou Tien, discevered... 详细信息

关键词： PRELIMINARY NOTIcE OF THE DIScOVERY OF AN ADULT SINANTHROPUS SKULL AT cHOU KOU TIEN

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

NOTIcE OF THE REcOVERY OF A SEcOND ADULT SINANTHROPUS SKULL SPEcIMEN

引用

地质学报 1930年第2期 97-101页

作者： davidson BLAcK cenozoic Research Laboratory of the Geological Survey of china

During the latter part of October 1929 Mr. W. c. Pei recovered in situ from the chou Kou Tien deposit a worn adult Sinanthropus tooth, the site of this discovery being designated in Teilhard and Young’s preliminary

关键词： NOTIcE OF THE REcOVERY OF A SEcOND ADULT SINANTHROPUS SKULL SPEcIMEN

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

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：