human activities in the fields of agriculture, municipal and industry introduce significant amounts of nutrients and organic materials into the rivers and streams resulting in their contamination. computer models such as qual2kw are used extensively for water quality management of rivers and streams. the qual2kw model is a one dimensional, non-uniform, steady water quality model, which has been...

The imaging of a small reflector embedded in a medium is a central problem in sensor array imaging. The goal is to find a reflector embedded in a medium. The medium is probed by an array of sources, and the signals backscattered by the reflector are recorded by an array of receivers. The responses between all pairs of source and receiver are collected so that the available information takes the...

The virtual reflector method simulates new seismic signals by processing traces recorded by a plurality of sources and receivers. The approach is based on the crossconvolution of the recorded signals and makes it possible to obtain the Green's function of virtual reflected signals as if in the position of the receivers (or sources) there were a reflector, even if said reflector is not present. ...

Composite Technology Development Inc. (CTD) is currently funded through the NASA Advanced Component Technology (ACT) program to develop an off-set fed, TEMBO continuous composite surface deployable reflector for earth science applications. This type of reflector will offer a parabolic surface with the accuracy needed for RF science measurements to Ka band and beyond, including a clean aperture ...

Commonly used direct rendering techniques simulate light transport for a complete scene, specified in terms of light sources, geometry, materials, participating media, etc. On the other hand, inverse rendering problems take as input a desired light distribution and try to find the unknown parts of the scene needed to get such light field. The latter kind, where inverse reflector design is inclu...

The dual polarized reflector antenna used for satellite communications consists of two reflectors; one reflector is solid, the other consists of metal grid. The structure is complicated and the bandwidth is narrow. This antenna structure can be simplified by removing the metal grid and using the solid reflector together with a thin electromagnetic band gap material pasted to the surface of the ...

Introduction. In some solar concentrating system applications, in which the incoming sunlight is augmented by using commercial flat plate reflectors placed on different sides of planar collector, it very important to choose optimum tilts boosters (attached edge-to-edge top and bottom collector) for each month, enhance their received irradiation over year southern Algeria. The novelty proposed w...

We consider reflector imaging in a weakly random waveguide. We address the situation in which the source is farther from the reflector to be imaged than the energy equipartition distance, but the receiver array is closer to the reflector to be imaged than the energy equipartition distance. As a consequence, the reflector is illuminated by a partially coherent field and the signals recorded by t...

Specification and analysis of complex systems can be approached top-down or bottom-up [11]. A top-down approach conceptualises a system using a global state and the behaviour represented using an aggregated macro-behaviour of the system elements. For example, the System Dynamics (SD) model [8] uses the concepts of stocks, flows, feedback loops and time delays. A top-down approach considers a re...

In order to extend the operation life of BN-600 reactor, it is necessary validate operability permanent reactor elements – including neutron reflector that operate under conditions with high damaging doses and temperatures. It can be done through irradiating metal simulating package inside a materials science assembly inserted in BN-600. The paper describes basic characteristics assembly, desig...