نتایج جستجو برای: radial array
تعداد نتایج: 193863 فیلتر نتایج به سال:
نیاز روز افزون صنعت به استفاده از قطعاتی با هندسه ی پیچیده مانند سطوح قالب ها و پره های توربین، منجر به پیشرفت هایی در زمینه ی تکنولوژی های جدید طراحی و ساخت این نوع قطعات گردیده است. محققین از روش های مختلفی برای ساخت سریع و با راندمان بالای این سطوح استفاده کردند. از جمله ی این روش ها استفاده از استراتژی های مناسب مسیر ابزار است. استراتژی های فرزکاری علاوه بر زمان تولیدی بر روی نیروهای ماشینک...
the need for clean groundwater resources to have sustainable development in a country is undoubted. due to the importance and high quality of karstic waters in supplying water in iran especially in shahrood city, it is attempted in this research work to recognize and explore karstic waters in southwest of tepal area, shahrood. for this purpose, integration of the results obtained from the metho...
ABSTRACT Despite being designed as an interferometer, the MeerKAT radio array (a Square Kilometre Array pathfinder) can also be used in autocorrelation (‘single-dish’) mode, where each dish scans sky independently. Operating this mode allows extremely high survey speeds to achieved, albeit at significantly lower angular resolution. We investigate recovery of baryon acoustic oscillation (BAO) sc...
Axial symmetry in x-ray radiation of wire-array z pinches is important for the creation of dynamic hohlraums used to compress inertial-confinement-fusion capsules. We present the first evidence that this symmetry is directly correlated with the magnitude of the negative radial electric field along the wire surface. This field (in turn) is inferred to control the initial energy deposition into t...
We have used the Very Long Baseline Array to measure the trigonometric parallax of several member stars of the Orion Nebula Cluster showing non-thermal radio emission. We have determined the distance to the cluster to be 414 ± 7 pc. Our distance determination allows for an improved calibration of luminosities and ages of young stars. We have also measured the proper motions of four cluster star...
The concept of optical phase discontinuities is applied to the design and demonstration of aberration-free planar lenses and axicons, comprising a phased array of ultrathin subwavelength-spaced optical antennas. The lenses and axicons consist of V-shaped nanoantennas that introduce a radial distribution of phase discontinuities, thereby generating respectively spherical wavefronts and nondiffra...
nanobumps and (d,e) gold nanocones using focused azimuthal (a,d) and radial polarizations (b,e). Representative top-view scanning electron microscopy (SEM) images of (c) gold nanobumps from the same array and (f) corresponding gold nanocones. Insets (d-f) correspond to SHG and SEM images of a gold nanorod on the same substrate. SECOND-HARMONIC GENERATION MICROSCOPY OF INDIVIDUAL METAL NANOPARTI...
This paper review the historical background of noninvasive blood pressure measurement methods with their accuracies achieved and explains the requirements for common national and international standards of accuracy. Also are shortly described the development of blood pressure measurement system and a method, named electronic palpation method (EP), suitable for the long-term measurement of heart...
In this paper, the Radial Strain (RS) and Strain Rate (SR) was calculated using tagged MRI (tMRI) data. Using tagged magnetic resonance imaging (tMRI), the left ventricle short axis of five healthy adults (three men and two women) and four healthy male rats was imaged during diastolic and systolic phases on the mid-ventricle level. The RS and radial SR of the left ventricle were calculated at t...
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