نتایج جستجو برای: coaxial

تعداد نتایج: 4934  

Journal: :Measurement Science and Technology 2018

2001
Walter Boyles

Broadcast is the most efficient means of delivering rich content to the consumer. Unicast pull is the most convenient method for the consumer to obtain rich content ondemand (any kind of content at any time). The inherent shared bandwidth nature of the Hybrid Fiber/Coax (HFC) network, coupled with advances in technology, allows the best attributes of both broadcast and unicast pull to be provid...

Journal: :IEEE Trans. Instrumentation and Measurement 2000
Randolph E. Elmquist

Coaxial straight-wire resistors have been constructed with the purpose of improving comparisons between resistors, capacitors, and inductors in the audio frequency range. The design is based on the principle that a coaxial line with a cylindrical shield can be described by relatively simple equationsfor the real and imaginary parts of the impedance. The resistors, with values above 100 n, will ...

Journal: :Optics letters 2002
Yong Xu Reginald K Lee Amnon Yariv

Using an asymptotic analysis, we analytically calculate the dispersion and the field distribution of guided modes in an all-dielectric coaxial fiber. We compare the analytical results with those obtained from numerical calculations and find excellent agreement between them. We demonstrate that both the Bragg reflection and the total internal reflection play important roles in providing confinem...

Journal: :Diagnostic and interventional radiology 2017
Çağlar Uzun Zehra Akkaya Ebru Düşünceli Atman Evren Üstüner Elif Peker Başak Gülpınar Atilla Halil Elhan Koray Ceyhan Kayhan Çetin Atasoy

PURPOSE We aimed to evaluate the diagnostic accuracy and safety of computed tomography (CT)-guided biopsy of pulmonary lesions with fine needle aspiration (FNA) using non-coaxial technique. METHODS We analyzed 442 patients who underwent CT-guided lung biopsy with FNA and non-coaxial technique to determine the diagnostic outcomes, complication rates, and independent risk factors for diagnostic...

2011
N. Wagner T. Sokoll O. Schimmer Norman Wagner

High-frequency electromagnetic (HF-EM) measurement techniques, e.g. dielectric spectroscopy, give inside into soil physical properties which are related to soil/water interactions such as the soil water characteristics. The open-ended coaxial line technique offers a non destructive determination of dielectric spectra of fine grained soil. In this study, a commercially available Agilent high tem...

Journal: :IEICE Transactions 2007
Chun-Ping Chen Deming Xu Zhewang Ma Tetsuo Anada

Two-Thickness-Method (TTM) based on an open-ended coaxial probe was investigated with an emphasis on uncertainty analysis to perfect this technique. Uncertainty equations in differential forms are established for the simultaneous measurement of complex electromagnetic (EM) parameters in the systematical consideration of various error factors in measurement. Worst-case differential uncertainty e...

Journal: :Nano letters 2012
Amr A E Saleh Jennifer A Dionne

Optical trapping using focused laser beams has emerged as a powerful tool in the biological and physical sciences. However, scaling this technique to nanosized objects remains challenging due to the diffraction limit of light and the high power levels required for nanoscale trapping. In this paper, we propose plasmonic coaxial apertures as low-power optical traps for nanosized specimens. The il...

Journal: :Physical chemistry chemical physics : PCCP 2015
Zhi-Feng Shi Yuan-Tao Zhang Xi-Jun Cui Shi-Wei Zhuang Bin Wu Xian-Wei Chu Xin Dong Bao-Lin Zhang Guo-Tong Du

Vertically aligned ZnO/MgO coaxial nanowire (NW) arrays were prepared on sapphire substrates by metal-organic chemical vapor deposition combined with a sputtering system. We present a comparative investigation of the morphological and optical properties of the produced heterostructures with different MgO layer thicknesses. Photoluminescence measurements showed that the optical performances of Z...

2010
B. Scharf

In two-dimensional electron gases confined to two coaxial tubes the “tube degree of freedom” can be described in terms of pseudospin-1/2 dynamics. The presence of tunneling between the two tubes leads to a collective oscillation known as pseudospin resonance. We employ perturbation theory to examine the dependence of the frequency of this mode with respect to a coaxial magnetic field for the ca...

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