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Assessment of left atrial appendage function by transesophageal echocardiography in patients two weeks after acute coronary syndromes

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Journal of Geriatric Cardiology 2005年第4期2卷 198-201页

作者： Grzegorz Piotrowski Zenon Gawor dariusz timler Jozef Tazbir District Specialistic Hospital by Miko aj Kopernik in ￡ód(z|') Poland

Background For many years in ischemic heart disease, ventricles rather than atria received attention so not much is known about left atrial function in left ventricular ischemia. Objective Our study aimed to evaluate left atrial appendage (LAA) function by means of biplane transesophageal echocardiography in patients ten days after acute coronary syndromes (ACS). Methods The study was performed on 16 adult patients (65.9±9.9 years old) in whom transesophageal echocardiography was done 10 days after ACS. The following left atrial appendage (LAA) planimetric parameters were analyzed: LAA transversal dimension, LAA longitudinal dimension,LAA maximal area, and LAA minimal area. LAA ejection fraction was calculated and analyzed. The following LAA Doppler parameters were analyzed: the peak LAA emptying and the peak LAA filling velocities. The control group consisted of 14 patients (43±14.6 years old) without cardiovascular diseases. Results Both LAA longitudinal dimension and LAA transversal dimension were significantly higher in patients with ACS than in control patients. The same was observed for LAA maximal area. Also LAA ejection fraction was higher in patients with ACS . LAA minimal area did not differ in the patients in either group. LAA peak emptying flow (LAAE) and LAA peak filling flow (LAAF) were significantly higher in patients of the study group than of the control group. Conclusion Our study shows that two weeks after acute coronary syndrome LAA as a reservoir as well as a pump works at a higher level than it does in the control group. (J Geriatr Cardiol 2005; 2(4):198-201)

关键词： left atrial appendage acute coronary syndromes transesophageal echocardiography

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QUANTUM-DOT CELLULAR AUTOMATA

QUANTUM-DOT CELLULAR AUTOMATA

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2004 7th International Conference on Solid-State and Integrated Circuits Technology（ICSICT 2004）

作者： Gregory L.Snider Alexei O.Orlov Ravi Kummamuru John timler Geza Toth Gary H.Bernstein Craig S.Lent Department of Electrical Engineering University of Notre DameNotre DameIN 46556

＜正＞An introduction to of quantum-dot cellular automata （QCA） is *** is a transistorless nanoelectronic computation paradigm that addresses the issues of device and power density which are becoming increasingly important in the electronics *** of CMOS is expected to come to an end in the next 10-15 years,with perhaps the most important limiting problem being the power density and the resulting heat generated. QCA offers the possibility of circuitry that dissipates many orders of magnitude less power than CMOS,is scalable to molecular dimensions,and provides the power gain necessary to restore signal *** cells are scalable to molecular dimensions and initial measurements have demonstrated single-electron switching within a molecule.

关键词： Quantum dots Quantum cellular automata Polarization Electrons FETs Stationary state Nanoscale devices Switches Power engineering computing Electronics industry

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傢具CAD真实感图形处理系统

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山东科学 1990年第3期3卷 51-55页

作者：龚斌李建苏光华邓博超山东大学山东省计算中心烟台木材工业公司

本文介绍了傢具CAD真实感图形处理中的一些方法。由于采用了改进的消隐算法、合理的光照模型和纹理模型、产生的图形真实感强,图形生成效率高,对提高傢具CAD系统的整体效益具有重要作用。

关键词：家具真实感图形 CAD

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