نتایج جستجو برای: barrier detector

تعداد نتایج: 148196  

ژورنال: سنجش و ایمنی پرتو 2019

Analyzes of environmental samples regarding their radioactivity is of important concern for health purposes. We need standard sources to determine radioactive components and their activities. These sources are usually produced regarding type of the sample. One of the fundamental and precise tools to recognize radioactive materials and their activities is HPGe detector. To reach this goal, the d...

1998
T. Azuma Y. Yamazaki K. Komaki M. Torikoshi A. Kitagawa E. Takada T. Murakami

We observed resonant coherent excitation (RCE) of 1s electron to nˆ 2 states in Ar17‡ through measurements of the survived fraction of 390 MeV/u hydrogen-like Ar17‡ channeled in a Si crystal. We adopted a totally depleted Si surface barrier detector as a target crystal as well as a probe of the energy deposition. The charge state of emerged ions was measured by a combination of a charge separat...

2016
C. H. Li O. M. J. van ‘t Erve Y. Y. Li L. Li B. T. Jonker

The surface states of 3D topological insulators (TIs) exhibit a helical spin texture with spin locked at right angles with momentum. The chirality of this spin texture is expected to invert crossing the Dirac point, a property that has been experimentally observed by optical probes. Here, we directly determine the chirality below the Dirac point by electrically detecting spin-momentum locking i...

Journal: :international journal of agricultural science, research and technology in extension and education systems 0
maryam omidi najafabadi department of agricultural extension and education, science and research branch, islamic azad university, tehran, iran mahsa rami department of agricultural extension and education, science and research branch, islamic azad university, tehran, iran

according to statistics released by agricultural insurance fund (aif) less than 4 million acres out of 90 million acres has been covered by pastures insurance. this observation along with several facts motivated authors to study possible barriers which pastures insurance has been encountered in practice. the research population included all the experts in agricultural insurance fund. small popu...

1996
G. Bazán A. O. Orlov G. L. Snider

We perform measurements on an AlGaAs/GaAs double-quantum-dot structure, where dots are separated by an opaque barrier and each dot conductance is measured independently and simultaneously. We measure the Coulomb blockade oscillations ~CBOs! for each dot when the structure is configured for one and two dots. When configured as a single-dot device, we sweep the backgate and observe different CBO ...

1999
C. W. Tipton R. C. Hoffman D. N. Robertson M. A. Quijada

The realization of a commercially viable, thin-film uncooled pyroelectric detector has been the focus of research for several years. As part of this effort, we show that a conventional metallic electrode system (typically Pt) can be replaced with a conductive oxide such as LaxSr(1–x)CoO3 (LSCO). In addition to being crystallographically compatible with the lead-based, pyroelectric oxides such a...

Journal: :international journal of occupational hygiene 0
mohammad reza monazzam occ. hyg. dep, school of public health, tehran university of medical sciences, tehran, iran yiu wai lam school of computing, science & engineering, university of salford, sallford, uk.

t-shape profile barriers are one of the most successful barriers among many different profiles. it has been shown that using welled diffusers on the top of t-shaped barriers makes a reactive barrier that shows better performance than that of any other used profile barriers compared with their equivalent absorbent barrier. the contribution of the top surface of reactive t-profile barriers to the...

2002
Michael Steiner R. W. Rendell

It is predicted by Schrödinger's equation that entanglement will occur in the interaction between detector and particle. We provide an analysis of the entanglement using the Gurvitz model of double-dot and detector. New results on entangled doubled-dots are provided as well as implications on Quantum Information processing. The prediction of entanglement under Schrödinger evolution is apparent ...

Journal: :Biosensors & bioelectronics 2011
Yongki Choi Siu-Tung Yau

Detection of analytes on the zepto-molar (10(-21) M) level has been achieved using a field-effect bio-detector. By applying a gating voltage to enzymes immobilized on the working electrode of the detector, amplification of the biocatalytic current was observed. The amplification is attributed to the modification of the tunnel barrier between the enzyme and the electrode by the gating voltage-in...

Journal: :Optics express 2012
Nan-Wei Chen Jin-Wei Shi Hsuan-Ju Tsai Jhih-Min Wun Fong-Ming Kuo Jeffery Hesler Thomas W Crowe John E Bowers

A 25 Gbits/s error-free on-off-keying (OOK) wireless link between an ultra high-speed W-band photonic transmitter-mixer (PTM) and a fast W-band envelope detector is demonstrated. At the transmission end, the high-speed PTM is developed with an active near-ballistic uni-traveling carrier photodiode (NBUTC-PD) integrated with broadband front-end circuitry via the flip-chip bonding technique. Comp...

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