نتایج جستجو برای: gpr wave

تعداد نتایج: 220482  

2015
Lawrence B. Conyers

An integrated approach to ground-penetrating radar interpretation should include not only the standard amplitude slice maps and isosurface renderings but also an analysis of individual reflection traces and adjusted and processed reflection profiles. Only when all those basic datasets are interpreted can the plethora of reflection features at various depths and locations within a grid be unders...

2011
Julien Minet Patrick Bogaert Marnik Vanclooster Sébastien Lambot

Ground penetrating radar (GPR) is an efficient method for soil moisture mapping at the field scale, bridging the scale gap between small-scale invasive sensors and large-scale remote sensing instruments. Nevertheless, commonly-used GPR approaches for soil moisture characterization suffer from several limitations and the determination of the uncertainties in GPR soil moisture sensing has been po...

Journal: :فیزیک زمین و فضا 0
بهرام جفرسته دانشجوی دکتری، گروه مهندسی معدن، دانشکده معدن، دانشگاه صنعتی اصفهان، ایران نادر فتحیان پور دانشیار، گروه مهندسی معدن، دانشکده معدن، دانشگاه صنعتی اصفهان، ایران سید حسن طباطبایی استادیار، گروه مهندسی معدن، دانشکده معدن، دانشگاه صنعتی اصفهان، ایران

ground penetration radar (gpr) as a nondestructive method for identifying underground objects has been successfully applied to different fields of science such as geotechnical investigations, oil and gas exploration, geology, pipe detection and archeology investigations. metallic and nonmetallic objects can be identified by this method.  the depth of penetration is dictated by the gpr antennas....

2001
ROSEMARY KNIGHT

Interpreters are routinely required to develop a continuous model of the subsurface through the integration of available data. One of the issues commonly encountered is how best to “fill in” the region between data points, or describe the region at a scale less than the scale of the sampling. We take this opportunity, as part of the Near-Surface Geophysics issue, to describe research currently ...

2014
P. A. Våland

where P is the transmitted power, τ is the integration time, Gt and Gr are the transmit and receive antenna gains, λ1 and λ2 are the longest and shortest wave lengths respectively, σ is the target radar cross section, R is the target range, k is Boltzmanns constant, T is the effective receiver noise temperature and B is the receiver bandwidth. In the case of GPR, the signal attenuation in the g...

2017
Qiang Li Chuan Lu Weixia Li Yuxian Huang Liang Chen

BACKGROUND/AIM The gamma-glutamyl transpeptidase-to-platelet ratio (GPR) is a novel serum model, which was reported more accurate than aspartate transaminase-to-platelet ratio index (APRI) and fibrosis index based on four factors (FIB-4) for diagnosing significant fibrosis and cirrhosis in HBV mono-infection in West Africa. We aimed to evaluate the diagnostic performance of GPR for liver fibros...

2007
Fawzy Abujarad

This thesis is concerned with detection logarithms of non-metallic anti-personnel (AP) land mines and the related signal processing using stepped-frequency ground penetrating radar (SF-GPR) technique. Modern land mines are essentially made out of plastic and ceramic materials. This makes their detection using GPR sensor almost impossible without proper signal processing. Many signal processing ...

2015
Allyson Kelley Jennifer Giroux Mark Schulz Bob Aronson Debra Wallace Ronny Bell Sharon Morrison

OBJECTIVE To compare American-Indian and Caucasian mortality rates from diabetes among tribal Contract Health Service Delivery Areas (CHSDAs) in the Great Plains Region (GPR) and describe the disparities observed. RESEARCH DESIGN AND METHODS Mortality data from the National Center for Vital Statistics and Seer*STAT were used to identify diabetes as the underlying cause of death for each deced...

2014
Ning Zhang Lina Pan

Public satisfaction measurement is the best way to evaluate the implementation effects of government process reengineering (GPR). The research on public satisfaction of electronic government is almost adapted from research on customer satisfaction, and is mainly about e-gov websites or various types of public services, while rare attention has been paid to the implementation results of GPR. Thi...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی خواجه نصیرالدین طوسی - دانشکده عمران 1389

دستگاه gpr(ground penetrating radar) بر اساس تئوری الکترومغناطیس عمل نموده و پروفیل‏هایی را از سطوح داخلی محیط برداشت شده ارایه می‏دهد . gpr شامل آنتن گیرنده و فرستنده است که آنتن فرستنده پالس الکترومغناطیس را در سطح زیرین زمین انتشار می‏دهد و سپس از روی سطوح مواد مختلف به دلیل اختلاف در ثابت دی‏الکتریک آن‏ها انعکاس می‏یابد. انرژی منعکس شده به طرف سطح زمین حرکت کرده و توسط آنتن گیرنده ثبت می‏گر...

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