نتایج جستجو برای: frequency gradient

تعداد نتایج: 603720  

1993
Michael E. Goss

Volume visualization techniques extract and display structures from three dimensional arrays of sample values representing physical objects. The shading of surfaces of the structures to simulate natural lighting makes the features of these structures visible in images. An important step in the image rendering process is the determination of the orientation of an extracted surface in the form of...

2002
Igor Lubomirsky Tzu Yu Wang Franco DeFlaviis Oscar M. Stafsudd

We created a material with a composition gradient within each grain. Due to the graded composition the ceramic does not show a sharp change in dielectric constant near the relaxation frequency. Instead, we observe gradual decrease in dielectric constant with frequency, with the loss tangent remaining practically unchanged (below 0.02 everywhere within the frequency range 0.0003-3 GHz). The tuna...

2014
Zoë F. Mann Benjamin Thiede Weise Chang Jung-Bum Shin Helen L. May-Simera Michael Lovett Jeffrey T. Corwin Matthew W. Kelley

The auditory systems of animals that perceive sounds in air are organized to separate sound stimuli into their component frequencies. Individual tones then stimulate mechanosensory hair cells located at different positions on an elongated frequency (tonotopic) axis. During development, immature hair cells located along the axis must determine their tonotopic position in order to generate freque...

Journal: :AJNR. American journal of neuroradiology 1998
D A Finelli G C Hurst R P Gullapalli

PURPOSE We developed and evaluated clinically T1-weighted three-dimensional gradient-echo magnetization transfer (MT) sequences for contrast-enhanced MR imaging of the brain. METHODS A short-repetition-time, radio frequency-spoiled, 3-D sequence was developed with a 10-millisecond MT pulse at high MT power and narrow MT pulse-frequency offset, and the enhancing lesion-to-normal white matter b...

2005
Penny Hix

In this paper a gradient-based algorithm for finding spectral peak locations is presented. The algorithm makes use of gradient and acceleration locations in the spectrogram for locating the peaks. Use of frequency gradients and accelerations locate peaks. The results are then interpolated to yield a smooth peak envelope. The method is evaluated in the aurora framework. A first pass locates all ...

Journal: :Cell biology international 2002
Xinchen Zhang Husheng Zhang Congyi Zheng Chaoyang Li Xinsong Zhang Wei Xiong

Extremely low frequency (ELF) pulsed-gradient magnetic field (with the maximum intensity of 0.6-2.0 T, gradient of 10-100 T.M(-1), pulse width of 20-200 ms and frequency of 0.16-1.34 Hz treatment of mice can inhibit murine malignant tumour growth, as seen from analyses at different hierarchical levels, from organism, organ, to tissue, and down to cell and macromolecules. Such magnetic fields in...

2003
Saraju P. Mohanty N. Ranganathan Sunil K. Chappidi

We model the power fluctuation as cycle-to-cycle power gradient and minimize the mean of the power gradients using ILP. We propose scheduling schemes for three modes of datapath design : single supply voltage and single frequency (SVSF), multiple supply voltages and dynamic frequency clocking (MVDFC), and multiple supply voltages and multicycling (MVMC). Various experiments are conducted on sel...

Journal: :American journal of physiology. Gastrointestinal and liver physiology 2005
Geoffrey Boddy E E Daniel

Rhythmic contractions generating transit in the digestive tract are paced by a network of cells called interstitial cells of Cajal (ICC) found in the myenteric plexus (MP). ICC generate cyclic depolarizations termed "slow waves" that are passively transmitted to the smooth muscle to initiate contractions. The opening of l-Ca(2+) channels are believed to be primarily responsible for the influx o...

Journal: :Computer Physics Communications 2015
Xian-Ming Gu Markus Clemens Ting-Zhu Huang Liang Li

Frequency domain formulations of computational electromagnetic problems often require the solutions of complex-valued non-Hermitian systems of equations, which are still symmetric. For this kind of problems a whole class of sub-variant solver methods derived from the complex-valued Bi-Conjugate Gradient method is available. This class of methods contains established solution methods as the Conj...

Journal: :Journal of the experimental analysis of behavior 2001
J A Dinsmoor

A molecular analysis based on the termination of stimuli that are positively correlated with shock and the production of stimuli that are negatively correlated with shock provides a parsimonious count for both traditional discrete-trial avoidance behavior and the data derived from more recent free-operant procedures. The necessary stimuli are provided by the intrinsic feedback generated by the ...

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