نتایج جستجو برای: reflectivity
تعداد نتایج: 6420 فیلتر نتایج به سال:
abstractthis study aimed to determine the relationship between l2 learners' autonomy and their cognitive style focusing on reflectivity. it was conducted with 140 iranian m.a. efl learners from department of english at islamic azad university of najafabad. in order to have a homogeneous sample, the second version of quick placement test (qpt) was administered. then, 85 lower and 50 higher profi...
Surface reflectivity effects on coherent backscattering have been studied by using variable-reflectivity mirrors at the sample surface. Photon-transport parameters obtained from coherent backscattering were found to be significantly improved by using current theoretical models for samples with high surface reflectivity.
A method for producing a radar-reflectivity map of the polar regions of the Moon or a planet from polar orbit with only the frequency shift of the reflected signals is described and simulated. A Radon transform of the reflectivity is obtained during multiple passes over the pole. Inversion of this Radon transform enables a map of radar reflectivity to be synthesized.
OBJECTIVE To study the characteristics of the reflectivity of the cystoid spaces and serous retinal detachment (SRD) on spectral-domain optical coherence tomography (SD-OCT) and the correlation with fluorescein findings in diabetic macular edema (DME). DESIGN Retrospective, observational, cross-sectional study. PARTICIPANTS Consecutive 134 eyes of 114 patients with clinically significant ma...
in this paper, the effects of reflected waves of the facets on the internal optical intensity of semiconductor dfb lasers are investigated. the uniformity of optical intensity along the cavity length is evaluated with flatness parameter. the dependence of this parameter on coupling coefficient, reflectivity and grating phase at the facets is also studied. this investigation shows that in some s...
When faced with a problem or choice, humans can use two different strategies: "cognitive reflectivity," which involves slow responses and fewer mistakes, or "cognitive impulsivity," which comprises of quick responses and more mistakes. Different individuals use these two strategies differently. To our knowledge, no study has directly investigated the brain regions involved in reflectivity-impul...
A major limitation of improved radar-based rainfall estimation is accurate calibration of radar reflectivity. In this paper, the authors fully automate a polarimetric method that uses the consistency between radar reflectivity, differential reflectivity, and the path integral of specific differential phase to calibrate reflectivity. Complete instructions are provided such that this study can se...
This paper investigates controlled elastic deflection of thin circular space reflectors using an inverse problem approach to non-linear thin membrane theory. When changing the surface reflectivity across the membrane, the distributed loads due to ambient solar radiation pressure can be manipulated optically, thus controlling the surface shape without using mechanical or piezo-electric systems. ...
Thin metal fiIrns (Cu, Au, Ni) on quartz glass were illuminated with nanosecond pulse.; of a frequency doubled Nd:YAG laser (A = 532 nm). The transient reflectivity behavlour was probed at the wavelength 633 nm, where these metals exhibit Drude-Iike optical behaviour: the reflectivity decreases with temperature in the solid and in the Iiquid state as well as at the solid-llquid phase transition...
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