نتایج جستجو برای: illuminators

تعداد نتایج: 127  

Journal: :Signal Processing 2014
Batu K. Chalise Yimin Zhang Moeness G. Amin Braham Himed

We propose efficient target localization methods for a passive radar system using time-of-arrival (TOA) information of the signals received from multiple illuminators, where the position of the receiver is subject to random errors. Since the maximum likelihood (ML) formulation of this target localization problem is a non-convex optimization problem, semi-definite relaxation (SDR)-based optimiza...

Journal: :Investigative ophthalmology & visual science 1980
H G Sperling

T:here appears in this issue an article by Calkins and Hochheimer (p. 1009) which presents evidence that light exposures from ophthalmoscopes, slit lamps, and overhead surgical lamps can present a hazard to the retinas of patients. Other studies have appeared recently which also indicate that ophthalmological diagnostic and treatment devices may be hazardous, on the basis of animal exposure eva...

2005
E. A. Widder B. H. Robison K. R. Reisenbichler S.H.D. Haddock

Observations of animals in the deep ocean typically require the use of bright lights that can damage eyes and disrupt normal behaviors. Although the use of infrared light is an effective means of unobtrusive observation on land, it is far less effective in the ocean where long wavelength light is rapidly attenuated by seawater. Here we describe in situ observations of the behavior of the sablef...

2012
Fung Jacky Wen Po Sheun Chung

The term “diffraction” has been defined by Sommerfeld as follows (E. Hecht, 2002): any deviation of light rays from rectilinear paths which cannot be interpreted as reflection or refraction. Diffraction is caused by the confinement of the lateral extent of a wave and is most importantly when that confinement is comparable in size to the wavelength of the radiation being used. The first accurate...

2012
Wen-Qin Wang

Bistatic synthetic aperture radar (BiSAR), operates with separate transmitter and receiver that are mounted on different platforms (Cherniakov & Nezlin, 2007), will play a great role in future radar applications (Krieger & Moreira, 2006). BiSAR configuration can bring many benefits in comparison with monostatic systems, such as the exploitation of additional information contained in the bistati...

2012
Yo Chan Kim Wan Chul Yoon

Although a few robots such as vacuum cleaning robots (Jones, 2006; Zhang et al., 2006), lawn mowing robots (Husqvarna; Friendlyrobotics), and some toy robots (Takara; Hasbro) have single functions or perform simple tasks, almost all other service robots perform diverse and complex tasks. Such robots share their work domains with humans, with whom they must constantly interact. In fact, the comp...

2016
Dominique Poullin

For now many years [1] [2], passive radars using transmitters of opportunity have been studied and their capabilities and limitations for detecting and localizing “classical” air targets are now quite well known. The most famous transmitters of opportunity considered are FM, DAB (Digital Audio Broadcasting), DVB (Digital Video Broadcasting) [3] and more recently, some studies are dealing with W...

Journal: :هنرهای تجسمی 0
عباس ایزدی دانشجوی کارشناسی ارشد صنایع دستی دانشگاه هنر محمدکاظم حسنوند تربیت مدرس

saqqā-ḵāna artists looked to cults, rituals, and visual elements of folk and local vernacular culture for inspiration. although many of these items appeared crude in their execution and lacked the artistic polish of artifacts made by professional calligraphers and painters, and were often created collaboratively as a kind of street art, their true significance was not lost to these artists. vie...

Journal: :هنرهای تجسمی 0
حبیب اله عظیمی کتابخانه ملی، دکترا

persian manuscripts were produced during the second century until the forth one in iran. iranians had experiences about painting in pre-islamic era, so they played an important role in creating art works such as miniature, illuminated pages in islamic civilization after the emergence of islam. in the first centuries of emerging islam, beautiful transcription, ornamentation of quran were honors ...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید

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