نتایج جستجو برای: background concentrations

تعداد نتایج: 1108431  

Journal: :تحقیقات علوم رفتاری 0
اسحق رحیمیان بوگر ضیاء قائم مقام فراهانی issac rahimian boogar zia ghaem-magham farahani

abstract aim and background: studying the role of background causes and biomarkers on early onset cardiovascular diseases' incidence as one important issue is need for prevention of these diseases. the purpose of this study was to identify the role of background factors and biomarkers for early onset cardiovascular diseases' incidence. methods and materials: in a descriptive study with cross-se...

2007
Alex Cao Abhilash K. Pandya Gulay K. Serhatkulu Rachel E. Weber Houbei Dai Jagdish S. Thakur Vaman M. Naik Ratna Naik Gregory W. Auner Raja Rabah Carl Freeman

1 Department of Pediatric Surgery, Children’s Hospital of Michigan, Detroit, MI 48201, USA 2 Department of Electrical & Computer Engineering, Wayne State University, Detroit, MI 48202, USA 3 Department of Physics, Wayne State University, Detroit, MI, 48202, USA 4 Department of Natural Sciences, University of Michigan-Dearborn, Dearborn, MI 48128, USA 5 Department of Pathology, Children’s Hospit...

Journal: :Environmental Health Perspectives 1989
B MacMahon

Three areas of activity in the field of low-level radiation epidemiology have been reviewed. They concern the questions of cancer risk related to antenatal X-ray exposure, occupational radiation exposure, and residence in areas of real or supposed increased levels of radiation. Despite the a priori unlikelihood of useful information developing from studies in any of these areas, such investigat...

Journal: :Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine 2010
Peder Kock Robert R Finck Jonas M C Nilsson Karl Ostlund Christer Samuelsson

A real time visualisation method, to be used in mobile gamma-spectrometric search operations using standard detector systems is presented. The new method, called deviation display, uses a modified waterfall display to present relative changes in spectral data over energy and time. Using unshielded (137)Cs and (241)Am point sources and different natural background environments, the behaviour of ...

2004
Brian Dalrymple

Previous articles have described a process for the elimination of background from fingerprint and other images by subtracting the background. Two options, f iltration and erasure, have been discussed. Channel subtraction, either in RGB (Red, Green, Blue) or HSI (Hue, Saturation, Intensity) mode, can also be effected with variable results. There exists a fourth option: substituting another item ...

2000
RICHARD C. HENRY

I review the nature of the diffuse cosmic ultraviolet background radiation. The ultraviolet background is the last frontier: all the other diffuse backgrounds have been examined, at least at some level. The ultraviolet background has only begun to be explored; it offers rich promise of new astrophysical knowledge.

Journal: :The British journal of ophthalmology 1973
R S Bartholomew

Pseudocapsular exfoliation occurs in most races and countries but appears to be particularly common in Norway and in the Eastern European and Mediterranean countries. It is rare in American Negroes, only two cases having been reported (Gradle and Sugar, 1947), and in Negroes in the West Indies (Connell, I970), and has not been reported in Negroes elsewhere outside South Africa (Bartholomew, I97...

1994
V. Barger R. J. N. Phillips D. Zeppenfeld

The distinct color ow of the qq ! qqH; H ! W + W ? process leads to suppressed radiation of soft gluons in the central region, a feature which is not shared by major background processes like t t production or q q ! W + W ?. For the leptonic decay of a heavy , it is shown that these backgrounds are typically accompanied by minijet emission in the 20{40 GeV range. A central minijet veto thus con...

2010
Qiuwei Hu Shutao Li Kexue He Hui Lin

Vehicle detection is an essential task in the intelligent transportation system, which will affects the performance of surveillance directly. This paper presents an approach to detect vehicle from a sequence of traffic images obtained from expressway scenes. Firstly, inter-frame difference method was used to choose some frames with small traffic flow, and then pixels detected as background are ...

Visual saliency is a cognitive psychology concept that makes some stimuli of a scene stand out relative to their neighbors and attract our attention. Computing visual saliency is a topic of recent interest. Here, we propose a graph-based method for saliency detection, which contains three stages: pre-processing, initial saliency detection and final saliency detection. The initial saliency map i...

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