Calculation of a double reflector Cassegrain antenna by physical optics method with taking into account multiple reflections between the and subreflector was performed. It shown that convergence characteristics (gain, efficiency, side-lobe level) increase accounting is observed. To check same calculated electric field integral equation unknown surface currents on sub-reflector. The comparison s...

Discovering hidden details in historical paintings, such as pentimenti, can help reveal historical influences and changing intentions of an artist. Top-down photographs of visible light historical paintings do not capture much of the finer surface detail on the object being photographed. We present a technique using only visible light photography with a specially constructed octagonal reflector...

By harnessing both hypothetical, synthetic basin and gas hydrate (GH) system models real-world of well-studied salt diapir-associated GH sites at Green Canyon (Gulf Mexico) Blake Ridge (U.S. Atlantic coast), we propose demonstrate movement (and in particular, diapirism) to be a new mechanism for the recycling marine GH. At Canyon, example, show that by considering this newly proposed diapir-dri...

Developed and investigated are IR (850 nm) light-emitting diodes based on AlGaAs/Ga(In)As heterostructures grown by the MOCVD technique with multiple quantum wells in active region a double optical reflector consisted of multilayer Al 0.9 Ga 0.1 As/Al As Bragg heterostructure an Ag mirror layer. Light-emitting external efficiency EQE=37.5% at current densities greater than >10 A/cm 2 hav...

Scotia Sea and the Drake Passage is key towards understanding development of modern oceanic circulation patterns their implications for ice sheet growth decay. The sedimentary record southern basins documents regional tectonic, oceanographic climatic evolution since Eocene. However, a lack accurate age estimations has prevented calibration reconstructed history. upper was scientifically drilled...

A pseudo-line D-T neutron source has been developed with new experimental techniques. This line source was applied in sophisticated neutronics experiments for an annular blanket arrangement simulating the tokamak geometry, as a new series in the JAERI/USDOE collaborative experimental program on fusion neutronics. The source characteristics of the present line source and the measurements for an ...