نتایج جستجو برای: vertical spectrum

تعداد نتایج: 315953  

2003
Mark R. Schoeberl Anne R. Douglass Zhengxin Zhu Steven Pawson

[1] We use kinematic and diabatic back trajectory calculations, driven by winds from a general circulation model (GCM) and two different data assimilation systems (DAS), to compute the age spectrum at three latitudes in the lower stratosphere. The age spectra are compared to chemical transport model (CTM) calculations, and the mean ages from all of these studies are compared to observations. Th...

ژورنال: طب جنوب 2012
غزنوی, آیسان, نخستین, محمدرضا,

زمینه: رادیوگرافی نقش مهمی در تشخیص پوسیدگی‌های ثانویه دارد. که به‌عنوان یکی از مهم‌ترین دلایل تعویض ترمیم می‌باشد. هدف از این بررسی، ارزیابی دقت تشخیصی پوسیدگی‌های ثانویه ایجاد شده در مواد ترمیمی زیبایی مختلف با تغییر زاویه عمودی اشعه (IVA= Incidence Vertical Angle) X می‌باشد. مواد و روش‌ها: در این مطالعه in vitro، در 40 دندان مولر پوسیده کشیده شده انسان (extracted teeth) حفرات MOD تهیه شدند. ...

2009
Ross Tulloch K. Shafer Smith

The quasigeostrophic equations consist of the advection of linearized potential vorticity coupled with advection of temperature at the bounding upper and lower surfaces. Numerical models of quasigeostrophic flow often employ greater (scaled) resolution in the horizontal than in the vertical (the two-layer model is an extreme example). In the interior, this has the effect of suppressing interact...

1997
C Chicone Y Latushkin S Montgomery-Smith

The spectrum of the kinematic dynamo operator for an ideally conducting uid and the spectrum of the corresponding group acting in the space of continuous divergence free vector elds on a compact Rie-mannian manifold are described. We prove that the spectrum of the kinematic dynamo operator is exactly one vertical strip whose boundaries can be determined in terms of the Lyapunov-Oseledets expone...

Journal: :Quarterly Journal of the Royal Meteorological Society 2015

2002
D. Saumon

Carbon monoxide and ammonia have been detected in the spectrum of Gl 229B at abundances that differ substantially from those obtained from chemical equilibrium. Vertical mixing in the atmosphere is a mechanism that can drive slowly reacting species out of chemical equilibrium. We explore the effects of vertical mixing as a function of mixing efficiency and effective temperature on the chemical ...

Journal: :Physical review letters 2008
Tsin-Dong Lee Chih-Yao Chen Yuanyao Lin Ming-Chih Chou Te-Ho Wu Ray-Kuang Lee

We demonstrate chaotic mode lasing in vertical cavity surface emitting lasers at room temperature, with an open cavity confined laterally by the native oxide layer. Instead of introducing any defect mode, we show that suppression of lower-order cavity modes can be achieved by destroying vertical reflectors with a surface microstructure. Lasing on chaotic modes is observed directly through colle...

2011
Arthur B. Baggeroer Henrik Schmidt Edward K. Scheer

The objectives are i) to characterize the ambient noise field coherence for the data recorded on the North Pacific Acoustic Laboratory (NPAL) and ii) to apply broadband, full field processing to characterize the sources in the local environment. Coherence measurements based upon field data are fundamental to understanding how the various sources of the ambient noise superimpose and lead to both...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید