نتایج جستجو برای: echo g

تعداد نتایج: 470649  

2014
Robert Frost Peter Jezzard Gwenaëlle Douaud Stuart Clare David A. Porter Karla L. Miller

PURPOSE Readout-segmented echo-planar imaging (rs-EPI) can provide high quality diffusion data because it is less prone to distortion and blurring artifacts than single-shot echo-planar imaging (ss-EPI), particularly at higher resolution and higher field. Readout segmentation allows shorter echo-spacing and echo train duration, resulting in reduced image distortion and blurring, respectively, i...

Journal: :iranian journal of veterinary medicine 0
mojtaba alishahi associated professor, department of clinical sciences, faculty of veterinary medicine, shahid chamran university of ahvaz, ahvaz, iran zahra tulaby dezfuly faculty of veterinary medicine, shahid chamran university of ahvaz, ahvaz, iran takavar mohammadian faculty of veterinary medicine, shahid chamran university of ahvaz, ahvaz, iran

background: evaluation of herbicide pollution in aquatic environments needs the great concern and the most important echo-pollutant effects of herbicides are related to their effects on non target aquatic organisms. native fish can serve as a proper bio-indicator for evaluation  of pollution on aquatic ecosystems. objectives: to find environmentally friendly herbicides, in this study the acute ...

Journal: :iranian journal of medical physics 0
mahmood nazarpoor department of radiology, faculty of paramedicine, tabriz university of medical sciences, tabriz, iran

introduction contrast-enhanced fluid-attenuated inversion recovery (flair) is one of the mri sequences that can be used for detection and evaluation of pathological changes in the brain. in this work, we have studied the effect of different echo times (te) on the maximum relationship between signal intensity and concentration of the contrast agent using the flair sequence. materials and methods...

Journal: :iranian journal of medical physics 0
mohammad ali oghabian neuroimaging and analysis group, research center of molecular and cellular imaging, tehran university of medical sciences, tehran, iran

introduction echo-planar imaging (epi) is a group of fast data acquisition methods commonly used in fmri studies. it acquires multiple image lines in k-space after a single excitation, which leads to a very short scan time. a well-known problem with epi is that it is more sensitive to distortions due to the used encoding scheme. source of distortion is inhomogeneity in the static b0 field that ...

2017
Fenglu Ge Prashan Premaratne Jiangtao Xi

This paper presents a new approach for Stereophonic acoustic echo cancellation (SAEC), based on a combination of J-H network and the natural gradient algorithm. In the new approach for SAEC, Computer simulations show that echoes are significantly reduced. Disciplines Physical Sciences and Mathematics Publication Details Ge, F., Premaratne, P. & Xi, J. (2005). Stereophonic acoustic echo cancella...

Journal: :international journal of advanced design and manufacturing technology 0
mohammadmahdi amiri phd student center of excellence in precision dimensional measurement technology development institute (tdi), acecr, sharif university branch. tehran, iran. m. tabatabaee ghomi assistant professor center of excellence in precision dimensional measurement technology development institute (tdi), acecr, sharif university branch. tehran, iran. *corresponding author gh. liaghat full professor mechanical engineering department tarbiat modares university tehran, iran.

in this paper a new method for nondestructive testing or nondestructive evaluation is proposed for glass-epoxy composite. for this purpose, impact-echo is used to evaluate the properties of composite materials, detecting internal defects and thickness measurement. in the impact-echo method a steel ball impacts on a composite plate and generates stress waves or p-waves which will be transferred ...

Journal: :رادار 0
رضا منصوری رضا محسنی

one of the most common signals used for achieving high range resolution in radar is stepped-frequency signals. when a target is stationary in these radars, dft (discrete fourier transform) based processing is used to attain high range resolution profile (hrrp). however, in the case of moving target, due to spreading of the echo signal spectrum, dft based processing is not optimal and decreases ...

Journal: :Molecular genetics and metabolism 2010
Piers C A Barker Sara K Pasquali Stephen Darty Richard J Ing Jennifer S Li Raymond J Kim Stephanie DeArmey Priya S Kishnani Michael J Campbell

BACKGROUND Pompe disease (acid α-glucosidase deficiency) is one of several lysosomal storage diseases amenable to treatment with enzyme replacement therapy (ERT). While echocardiography (echo) has been the standard method to evaluate the cardiac response to ERT, cardiac magnetic resonance imaging (CMR) has the advantage of a better tissue definition and characterization of myocardial fibrosis. ...

بکرانی, مهدی , لطفی زاد, مجتبی ,

Stereophonic acoustic echo cancellation is one of the expanding areas in the field of the speech/multimedia communication systems. In a conventional stereophonic acoustic echo canceller, working in a stereo communication system, the existence of the strong cross-correlation between the input signals to the two channels has the problem of the low convergence speed of the weights of the adaptive ...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید