نتایج جستجو برای: spectral performance
تعداد نتایج: 1196317 فیلتر نتایج به سال:
In recent days, the Worldwide Interoperability for Microwave Access (WiMAX) technology has widely used for wireless mobile devices such as handsets, notebook PCs and so on. In addition, Multi-antenna systems for handsets such as diversity and Multiple-input Multiple-out (MIMO) applications has developed, which are seen as the potential technologies for enhancing the performance and capacity wit...
Various types of large area silicon microstrip detectors were fabricated for development of radiation-tolerant detectors operational in the LHC ATLAS SCT. The detectors were irradiated with 12-GeV protons at KEK to fluences of 1.7×10 and 4.2×10 protons/cm. Irradiated samples include n-on-n detectors with 4 kΩ cm bulk resistivity and p-on-n detectors with 1 kΩ cm and 4 kΩ cm bulk resistivities. ...
The designers of a mobile cellular system must evaluate the possible configurations of the system components and their characteristics in order to develop a system with greater efficiency. The useful parameters to estimate performances of the system are voice quality, frequency spectrum efficiency and grade of service (GOS). In this study, a scheme proposed to reduce the lost calls and interrup...
let x be an n-square complex matrix with the cartesian decomposition x = a + i b, where a and b are n times n hermitian matrices. it is known that $vert x vert_p^2 leq 2(vert a vert_p^2 + vert b vert_p^2)$, where $p geq 2$ and $vert . vert_p$ is the schatten p-norm. in this paper, this inequality and some of its improvements ...
Hyper-Spectral Imaging sensor (HSI) aboarded on the HJ-1A (The Small Satellite Constellation for Environment and Disaster Monitoring) was launched Sep. 6, 2008, in China. HSI covers the spectral range from 450 nm to 950 nm, with average spectral resolution 4nm[1]. Spectral calibration is one of the key performance parameters of hyper-spectral imaging sensor, the decline of spectral performance ...
in the present study, a spectral finite element method is developed for free and forced transverse vibration of levy-type moderately thick rectangular orthotropic plates based on first-order shear deformation theory. levy solution assumption was used to convert the two-dimensional problem into a one-dimensional problem. in the first step, the governing out-of-plane differential equations are tr...
This paper describes a new design of standard agarose gel electrophoresis procedure for nucleic acids analysis. The electrophoresis was improved by using the real-time spectral analysis of the samples to increase its performance. A laser beam illuminated the analysed sample at wavelength with the highest absorption of gel components. Thus, DNA band is detected well before it may exits a gel pla...
Two different classes of quality measures are discussed and compared: absolute and relative measures. The relative class to which the prediction error belongs has many different approximations and equivalents, like the spectral distortion and the likelihood ratio. This measure is based on time series theory and can be written as a relative error in the frequency domain. It is useful in many app...
Stephen Guattery Gary L. Miller Abstract Computing graph separators is an important step in many graph algorithms. A popular technique for computing graph separators involves spectral methods. However, there is not much theoretical analysis of the quality of the separators produced by spectral methods; instead it is usually claimed that such methods \work well in practice." We present an initia...
We describe the development and implementation of a spectral element code for multimillion gridpoint simulations of incompressible ows in general two-and three-dimensional domains. Parallel performance is present on up to 2048 nodes of the Intel ASCI-Red machine at Sandia.
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