نتایج جستجو برای: white beam
تعداد نتایج: 292567 فیلتر نتایج به سال:
A complete noise analysis of a two-beam photopyroelectric ~thermal-wave! destructive interferometric sensor instrument is presented and compared to its single-beam, noninterferometric counterpart. The noise analysis is performed using a Green-function formalism applied to experimental observations. The instrumental background noise contribution from the detector and the amplifier is separated f...
We observe the rotational Doppler shift of an orbital angular momentum (OAM)-carrying white-light beam after it is backscattered from a rotating object. Unlike the well known linear shift, this rotational shift is independent of the optical frequency, and hence each spectral component of the scattered light is shifted by the same value. Consequently, even a white-light source can give rise to a...
Initial operating experience with the SLAC electron-positron storage ring SPEAR is described. A single-beam coherent instability, which can be suppressed either by control of the ring chromaticity or by feedback, has been observed. A second single-beam coherent instability has been observed at currents around 50 mA and is not yet understood. Current-dependent bunch lengthening and widening have...
We study destriping as a map-making method for temperature-and-polarization data for cosmic microwave background observations. We present a particular implementation of destriping and study the residual error in output maps, using simulated data corresponding to the 70 GHz channel of the Planck satellite, but assuming idealized detector and beam properties. The relevant residual map is the diff...
A number of field experiments measuring the fluctuating intensity of a laser beam propagating along horizontal paths in the maritime environment is performed over sub-kilometer distances at the United States Naval Academy. Both above the ground and over the water links are explored. Two different detection schemes, one photographing the beam on a white board, and the other capturing the beam di...
I12 is the Joint Engineering, Environmental and Processing (JEEP) beamline, constructed during Phase II of the Diamond Light Source. I12 is located on a short (5 m) straight section of the Diamond storage ring and uses a 4.2 T superconducting wiggler to provide polychromatic and monochromatic X-rays in the energy range 50-150 keV. The beam energy enables good penetration through large or dense ...
شته مومی کلم، brevicoryne brassicae یکی از آفات مهم با طیف میزبانی وسیع می باشد که به گیاهان تیره چلیپائیان خسارت می زند. در این بررسی، جدول باروری شته مومی کلم روی هشت رقم کلم گل (smilla, snow mystique, white cloud, buris, galiblanka, snow crown, sg,tokita) در شرایط آزمایشگاهی با دمای 1±25 درجه سلسیوس و رطوبت نسبی 5±60 درصد و دوره نوری 16 ساعت روشنایی و 8 ساعت تاریکی انجام شد. نرخ ذاتی افزایش ...
The cumulative achievements in the fields of science and technology have allowed us to substantially approach solution phase problem optics. Among all phasometric methods, single-beam methods are most promising, since they more variable versatile. Single-beam based either on analysis intensity distribution, as is conducted by interferometers wavefront sensors, or transformation into an distribu...
Integrating and differentiating matrices allow the numerical integration and differentiation of functions whose values are known at points of a discrete grid. Previous derivations of these matrices have been restricted to one-dimensional grids or to rectangular grids with uniform spacing in at least one direction. The present work develops integrating and differentiating matrices for grids with...
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