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AMBIENT TEMPERATURE MERCURY ZINC TELLURIDE PHOTODETECTORS CAN ACHIEVE DETECTIVITY HIGHER THAN 1*108 cmHz1/2W-1 AT 10.6μm

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AMBIENT TEMPERATURE MERCURY ZINC TELLURIDE PHOTODETECTORS CA...

International Conference on Millimeter Wave and far-Infrared Technology

作者： jozef piotrowski Microslaw Grudzien Institute of Plasma Physics and Laser Hicrofusion P. O. Box 49 00-908 Warsaw 49 Poland Vigo Ltd. P. O. Box 45 00-908 Warsaw 49 Poland

＜正＞ Ambient temperature 10.6μm HgZnTe photoconductors are reported. The calculations show that the figure of merit of this material for ambient temperature long-wavelength photoconductors is higher compared to the...

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新一代近室温光电探测器(上)

红外 1996年第3期17卷 15-22页

作者： jozef piotrowski 李玲

红外光电探测器的主要缺点是需要进行致冷,以便抑制会导致噪声的自由载流子的热产生。本文将讨论在不进行低温致冷条件下工作的红外光电探测器,提高其性能的新的方法,包括器件的最佳设计、采用把光电探测器光学浸没到高折射率的透镜中... 详细信息

红外光电探测器的主要缺点是需要进行致冷,以便抑制会导致噪声的自由载流子的热产生。本文将讨论在不进行低温致冷条件下工作的红外光电探测器,提高其性能的新的方法,包括器件的最佳设计、采用把光电探测器光学浸没到高折射率的透镜中以及光学共振腔。然而,另一种十分有发展前景的方法是用电荷载流子使半导体耗尽而抑制自由载流子的热产生,这种热产生是受俄歇机制控制的。利用排斥效应、提取效应以及磁集中效应能够实现静态耗尽。把不同的方法组合起来最终将使我们能够在非致冷条件下实现红外探测器的近背景限光电探测(near-BLIP)性能。

关键词：半导体红外探测器非平衡近室温光电探测器

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设计师仍然喜欢选择碲镉汞

红外 1998年第5期19卷 1-7页

作者： jozef piotrowski 贡树行波兰华沙市VIGO系统开发部

1.引言在过去的三十多年中,碲镉汞(Hg_(1-x)Cd_xTe)已经成为制造中波和长波(λ=3～30μm)红外光电探测器的最重要的半导体材料。在硅和砷化镓以后,碲镉汞就是最重要的半导体之一。就已知材料而言,还没有那一种能在基本性能和可塑性上... 详细信息

1.引言在过去的三十多年中,碲镉汞(Hg_(1-x)Cd_xTe)已经成为制造中波和长波(λ=3～30μm)红外光电探测器的最重要的半导体材料。在硅和砷化镓以后,碲镉汞就是最重要的半导体之一。就已知材料而言,还没有那一种能在基本性能和可塑性上超过它。而且,Hg_(1-x)CdxTe的晶格参数几乎恒定不变,这对于根据复式异质结结构来制造新的器件尤其重要。最初,Hg_(1-x)CdxTe的成功仅仅是因为利用组分X=0.

关键词：碲镉汞红外探测器红外材料半导体

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