نتایج جستجو برای: سیگنالهای uhf
تعداد نتایج: 2607 فیلتر نتایج به سال:
This paper presents indoor propagation measurements for a radiating cable in the UHF band, from 800 MHz to 2.5 GHz, in order to analyse the behaviour of such device for the integration of various wireless technologies. The measurements showed a different behaviour in the received power in contrast with a particular propagation model of radiating cables, which was reported in the literature. The...
Let A be a simple separable unital C*-algebra satisfying the UCT, and assume that A has finite decomposition rank. Let Q denote the UHF algebra with K0(Q) = Q. Then A⊗Q can be tracially approximated by unital Elliott-Thomsen algebras, and therefore A ⊗ Z is an ASH algebra (hence classifiable), where Z is the Jiang-Su algebra.
در این پایان نامه ابتدا با مفهوم اگزواسکلتون ها آشنا شده و پس از آن به بررسی تاریخچه ربات های توانبخشی پایین تنه می پردازیم، سپس مبانی عملکردی آن ها را مرور خواهیم کرد. در ادامه طرحی برای ربات پوششی پایین تنه ارائه شده است که دارای 5 درجه آزادی برای هر پا (مدل rprpr) و دارای قابلیت تنظیم برای افراد بیمار با یک میزان تغییر در سایز و قد آن ها بر اساس میزان اندازه های استاندارد را دارد. سپس به بر...
Experimental research on the influence of temperature on the discharge signal of void defects in GIS
Temperature is an important environmental factor during the operation of gas-insulated switchgear (GIS), affecting evaluation results GIS equipment to increase risk power system. However, influence temperature on partial discharge detection signal still unclear. Aimed at common void defects in GIS, law change number ultrahigh-frequency (UHF) pulses, UHF amplitude, characteristic value map, and ...
Magnetic resonance imaging (MRI) at ultra-high fields (UHF), such as 7 T, provides an enhanced signal-to-noise ratio and has led to unprecedented high-resolution anatomic images and brain activation maps. Although a variety of radio frequency (RF) coil architectures have been developed for imaging at UHF conditions, they usually are specialized for small volumes of interests (VoI). So far, whol...
Investigation of inertia-gravity waves in the upper troposphere/lower stratosphere over northern Germany observed with collocated VHF/UHF radars A. Serafimovich, P. Hoffmann, D. Peters, and V. Lehmann Institute of Atmospheric Physics, Kühlungsborn, Germany Meteorological Observatory, Lindenberg, Germany Received: 6 July 2004 – Accepted: 20 July 2004 – Published: 5 August 2004 Correspondence to:...
Empirical propagation loss models play a crucial role in wireless communication system with their cost-effectiveness and simplicity. In this letter, we present mathematical characterization of the Federal Communication Commission (FCC) F(50,50) curve for Very High Frequency (VHF) Ultra (UHF) band. The proposed empirical model is based on novel step-wise fitting FCC signal strength data. intende...
Specht's Theorem states that two matrices A and B in M n ( C ) are unitarily equivalent if only tr w , ? = for all words x y non-commuting variables . In this article we examine to what extent trace condition characterises approximate unitary equivalence uniformly hyperfinite (UHF) -algebras. particular, show given elements a b of the universal UHF-algebra Q which generate -algebras satisfying ...
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