نتایج جستجو برای: peak frequency shift to lower frequencies2

تعداد نتایج: 10799248  

Journal: :The Journal of experimental biology 1994
T Yoshikawa S Mori A J Santiesteban T C Sun E Hafstad J Chen D B Burr

There is anecdotal evidence that bone strains may increase to the point that bone becomes susceptible to rapid failure when muscles become fatigued. To determine whether neuromuscular response could be a factor in accelerating bone failure, we tested the hypothesis that muscle fatigue causes a significant increase in peak principal and shear strains in bone. Ten adult foxhounds were subjected t...

2010
Michael Scharrer Heeso Noh Xiaohua Wu Mark A Anderson Alexey Yamilov Hui Cao Robert P H Chang

We report room temperature lasing in ZnO inverse opal photonic crystals in the near-ultraviolet (UV) frequency range. We observe random lasing due to disorder in the structures when the photonic pseudogaps are located away from the ZnO gain spectrum. Tuning the first ŴL-pseudogap to the gain peak leads to a five-fold reduction in lasing threshold and a frequency shift of the lasing modes due to...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس 1389

growing demands and requires of high data rate systems cause significant increase of high frequency systems for wideband communication applications. as mixers are one of the main blocks of each receivers and its performance has great impact on receiver’s performance; in this thesis, a new solution for ku-band (12-18 ghz) mixer design in tsmc 0.18 µm is presented. this mixer has high linearity a...

Journal: :Biometrics 2007
Nicoleta Serban

MICE--multiple-peak identification, characterization, and estimation--is a procedure for estimating a lower bound of the number of frequency peaks and for estimating the frequency peak parameters. The leading application is protein structure determination using nuclear magnetic resonance (NMR) experiments. NMR frequency data are multiple-peak data, where each frequency peak corresponds to two c...

Journal: :ارتقای ایمنی و پیشگیری از مصدومیتها 0
علی ارحمی دولت ابادی a arhamidoulatabadi دانشگاه علوم پزشکی شهید بهشتیسازمان اصلی تایید شده: دانشگاه علوم پزشکی شهید بهشتی (shahid beheshti university of medical sciences) کامران حیدری k hedari دانشگاه علوم پزشکی شهید بهشتیسازمان اصلی تایید شده: دانشگاه علوم پزشکی شهید بهشتی (shahid beheshti university of medical sciences) حمید رضا حاتم آبادی hr hatamabadi دانشگاه علوم پزشکی شهید بهشتیسازمان اصلی تایید شده: دانشگاه علوم پزشکی شهید بهشتی (shahid beheshti university of medical sciences) علی وفایی a vafaei دانشگاه علوم پزشکی شهید بهشتیسازمان اصلی تایید شده: دانشگاه علوم پزشکی شهید بهشتی (shahid beheshti university of medical sciences)

background and aim: motor vehicle accidents are common cause of mortality, morbidity and disability. human factors are principle cause for frequency of motor vehicle accident. in most studies, 52-40% lower limb injuries are trauma from a motorcycle accident. these accidents cause high financial cost and harm for society. materials and methods: in this study, patients with lower limb injuries re...

Journal: :iranian journal of applied animal science 2015
h. atashi

the aim of this study was to investigate the effect of milking frequency (three times daily vs. two times daily) on the lactation curve shape, partial and 305-d lactation performance in holstein dairy cows in iran. data from february 2000 to december 2012 comprising 217345 lactations on 141364 cows distributed in 324 herds collected by the animal breeding center of iran were used. the mean milk...

2002
Cheng Luo Muriel Médard

In wideband systems that decorrelate in time and frequency, capacity can be reached in the limit of infinite bandwidth by using impulsive frequency-shift keying with vanishingly small duty cycle. The richness of the codewords is then created through the large bandwidth. We show that frequencyshift keying with small duty cycle, using traditional random coding arguments, can achieve rates close t...

Journal: :Optics letters 2007
P Fendel S D Bergeson Th Udem T W Hänsch

We report a new absolute frequency measurement of the Cs 6s-8s two-photon transition measured using frequency comb spectroscopy. The fractional frequency uncertainty is 5x10(-11), a factor of 6 better than previous results. The comb is derived from a stabilized picosecond laser and referenced to an octave-spanning femtosecond frequency comb. The relative merits of picosecond-based frequency com...

Journal: :فیزیک زمین و فضا 0
سمیرا محمدی کارشناس ارشد ژئوفیزیک (لرزه شناسی)، دانشگاه آزاد اسلامی واحد ساوه، ایران حمیدرضا سیاه کوهی دانشیار، گروه فیزیک زمین، موسسه ژئوفیزیک دانشگاه تهران، ایران

obtaining a seismic section with high temporal and spatial resolution was always one of the goals of seismic data processors and interpreters. accurate estimation of the thicknesses of thin beds is an important tool in this regard. the basic problem is that the wavelength of the signal must be similar in dimention to that of the bed thinness. if it is much longer than the bed thinness, the dete...

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