نتایج جستجو برای: medium distance 35
تعداد نتایج: 638962 فیلتر نتایج به سال:
How verbal and nonverbal visuoperceptual input connects to semantic knowledge is a core question in visual and cognitive neuroscience, with significant clinical ramifications. In an event-related functional magnetic resonance imaging (fMRI) experiment we determined how cosine similarity between fMRI response patterns to concrete words and pictures reflects semantic clustering and semantic dista...
This work provides a proof-of-concept for linear-position sensor using an ultrawideband (UWB) frequency-modulated continuous wave (FMCW) radar system operating at 126–182 GHz. It is the first to show environmental compensated and calibration-free distance measurements with micron accuracy medium range millimeter-wave (mmWave) technology. We addressed hardware imperfections, parameter estimation...
Magnetic inversion lines are generally constructed from line-of-sight magnetic field data which have been smoothed to reduce the resolution scale of the data. This eliminates the fine details of the magnetic inversion lines found in regions of strong magnetic field. The paper presents a new approach to constructing magnetic neutral lines, based on a distance transform, which aims to construct n...
The FemtoMAX beamline facilitates studies of the structural dynamics of materials. Such studies are of fundamental importance for key scientific problems related to programming materials using light, enabling new storage media and new manufacturing techniques, obtaining sustainable energy by mimicking photosynthesis, and gleaning insights into chemical and biological functional dynamics. The Fe...
OBJECTIVE Gamma camera nonuniformity can result in the presence of ring artifacts in reconstructed SPECT images. The objective of this study is to compare the relationship between ring artifact magnitude and image noise in tomographic images reconstructed using FBP and OSEM. METHODS A cylindrical phantom was filled with water and (99m)TC: Seven tomographic acquisitions were performed, with to...
پسماند چوبی درشت ) coarse woody debris ( یکی از اجزای مهم اکوسیستم جنگل است که نقش مهمی در فرآیندهای این اکوسیستم ایفا میکند. طی دهه اخیر توجه فراوانی به این جزء مهم بومسازگان توسط بوم- شناسان و جنگلشناسان شده است و روشهایی برای نمونهبرداری این جزء مهم اکوسیستم معرفی شده که همگی قطعات cwd را با احتمال نابرابر به عنوان نمونه انتخاب می نمایند. pds ( perpendicular distance sampling ،) dls ( dis...
A simple method for obtaining 1H–13C HETCOR solid-state NMR spectra reflecting only mediumand long-range 1H–13C correlation peaks is presented. By dephasing the magnetization of protons directly bonded to a 13C nucleus, the short-range correlation peaks, which contain limited structural information, can be cleanly suppressed without reducing the long-range cross peaks significantly. The resulti...
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