نتایج جستجو برای: m distortion

تعداد نتایج: 578604  

Journal: :The Journal of chemical physics 1968
I Salmeen G Palmer

We have observed an anisotropic EPR spectrum in a frozen solution of the low-spin (~=i) ~e~op~tein ferricytochrome c. These results are interpreted in terms of the theory for ~e low-sp~ femc lon m an octahedral crystal field which is subject to an (axial) distortion along. the a:os perpendicu~r ~ the heme plane and a (rhombic) distortion in the plane of the heme, and a spm--{)rblt cons~t which ...

2000
A. J. S. Hamilton Max Tegmark Nikhil Padmanabhan

We present a state-of-the-art linear redshift distortion analysis of the recently published IRAS Point Source Catalog Redshift Survey (PSCz). The procedure involves linear compression into 4096 Karhunen-Loève (signal-to-noise) modes culled from a potential pool of ∼ 3× 10 modes, followed by quadratic compression into three separate power spectra, the galaxy-galaxy, galaxy-velocity, and velocity...

Journal: :Medical History 1981
Simon Schaffer

mendable enthusiasm and praiseworthy humility. His object has been to present to his fellow neurologists, especially those entering the speciality, certain topics that he judges to be important, interesting, and handleable. It is, therefore, necessary to realize at once that Dr. Spillane's book is not a history of neurology. It is a survey of selected subjects arranged chronologically, from Gal...

Journal: :The American Mathematical Monthly 2014
J. Scott Carter Daniel S. Silver Susan G. Williams

A knot is a circle smoothly embedded in 3-dimensional Euclidean space or its compactification, the 3-sphere. Two knots are regarded as the same if one can be smoothly deformed into the other.1 The mathematical theory of knots emerged from the smoky ruins of Lord Kelvin’s “vortex atom theory,” a hopelessly optimistic theory of matter of the nineteenth century in which atoms appeared as microscop...

2016
David Grant Taylor D. G. Taylor

There are parallels between the time distortion equations of General and Special Relativity. The time distortion in Special Relativity limits the “Real” velocity of a particle to the speed of light |c| by slowing the velocity of bosons/energy and increasing the mass of fermion||lepton (or matter) particles. In General Relativity, the gravitational slowdown of bosons/gravitons limits the escape ...

Journal: :IEEE Trans. Information Theory 1985
Chris Heegard Toby Berger

-The problem is considered of encoding a discrete memoryless source when correlated side information may or may not be available to the decoder. It is assumed that the side information is not available to the encoder. The rate-distortion function R( D,, D2) is determined where D, is the distortion achieved with side information and D, is the distortion achieved without it. A generalization is m...

2000
J. M. de la Rosa B. Pérez-Verdú A. Rodríguez-Vázquez

This paper analyses the transient behaviour of SwItched-current (SI) memory cells placed at the front-end of high-speed A/D interfaces. Based on the Volterra series method, the non-linear sampling process occurring in such cells is studied and closed-form expressions are obtained for the Total Harmonic Distortion (THD) and the intermodulation distortion. The analysis is extended to the case of ...

2009
V. Hoversten S. Arnstein D. Bridwell A. Bucher D. Falconer L. Greenspan

In many communication problems the source output is not simply one of M equally ly messages and the user is not merely interested in the probability that the received information is right or wrong. More generally, a source may have any probability distribution P(w) defined over its possible outputs, and the system performance may be measured by the average value of a distortion function d(wi, w...

2011
Zhexin Xu Lin Wang Kyung Sup Kwak Guanrong Chen

Designing a non-ideal delay line (DL) with phase distortion in a transmitted-reference ultra-wideband system (TR-UWB) with an autocorrelation receiver (AcR) is a great technical challenge. Differing from the currently empirical design method of DL, in this paper a semi-analytic approach is proposed through Gaussian approximation of the expression for conditional bit error rate (BER), based on i...

Journal: :iranian journal of medical physics 0
m. ashkanmehr m.sc. in nuclear engineering dept., islamic azad university, tehran, iran. n. riyahi alam associate professor, physics and biomedical engineering, tehran university of medical sciences, tehran, iran. research center for science & technology in medicine, imam khomeini hospital, tehran. iran. m.a. oghabian associate professor, physics and biomedical engineering, tehran university of medical sciences, tehran, iran. research center for science & technology in medicine, imam khomeini hospital, tehran. iran. a. ghasemzadeh m. sc. in research center for science & technology in medicine, imam khomeini hospital, tehran. iran. m. bakhtiary m. sc. in research center for science & technology in medicine, imam khomeini hospital, tehran. iran. h. ghanaati associate professor, radiology dept., medical imaging center, imam khomeini hospital, tehran university of medical sciences , tehran, iran.

introduction:  image  distortion  is  one  of  the  major  problems  of  magnetic  resonance  imaging  (mri) for use in 3dmri, velocity mri, fmri and radiotherapy treatment planning (rttp). it is  widely known that the most obvious effect of the inhomogenity of the magnetic fields and the  nonlinearity  of  the  gradient  is  the  geometric  distortion  of  mr  tomograms.  in  this  study,  the...

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