نتایج جستجو برای: pfd

تعداد نتایج: 445  

Journal: :Ear and hearing 2009
Vasant K Dasika Lynne A Werner Susan J Norton Kaibao Nie Jay T Rubinstein

OBJECTIVES First, to establish the feasibility of the observer-based psychophysical procedure (OPP) in measuring sound detection in infant and toddler cochlear implant (CI) recipients. Second, to measure the psychometric function for detection (PFD) from individual subjects. Third, to determine whether reaction time (RT) provides information about the auditory sensitivity of young CI users. D...

2014
George R. Littlejohn Jessica C. Mansfield Jacqueline T. Christmas Eleanor Witterick Mark D. Fricker Murray R. Grant Nicholas Smirnoff Richard M. Everson Julian Moger John Love

Plant leaves are optically complex, which makes them difficult to image by light microscopy. Careful sample preparation is therefore required to enable researchers to maximize the information gained from advances in fluorescent protein labeling, cell dyes and innovations in microscope technologies and techniques. We have previously shown that mounting leaves in the non-toxic, non-fluorescent pe...

Journal: :Tissue engineering. Part A 2016
Aida Rodriguez-Brotons William Bietiger Claude Peronet Allan Langlois Jordan Magisson Carole Mura Cynthia Sookhareea Valerie Polard Nathalie Jeandidier Franck Zal Michel Pinget Séverine Sigrist Elisa Maillard

Transplantation of encapsulated islets in a bioartificial pancreas is a promising alternative to free islet cell therapy to avoid immunosuppressive regimens. However, hypoxia, which can induce a rapid loss of islets, is a major limiting factor. The efficiency of oxygen delivery in an in vitro model of bioartificial pancreas involving hypoxia and confined conditions has never been investigated. ...

Journal: :Applied psychophysiology and biofeedback 2004
Olafur S Palsson Steve Heymen William E Whitehead

This review aimed to critically evaluate the literature on the efficacy of biofeedback for functional anorectal disorders, rate these biofeedback applications according to established guidelines, and make recommendations for this field based on the literature. The Medline and PsychInfo databases were searched to obtain all papers published from 1975 to 2003 that included the terms "biofeedback"...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده برق و کامپیوتر 1391

گسترش نیازها، افزایش کاربران و معرفی سرویسهای جدید روش فعلی استفاده از فضای فرکانسی که مبتنی بر اختصاص ثابت فرکانس است را ناکارآمد می نماید. روش اختصاص فرکانس بصورت پویا می تواند سبب افزایش بازده در بکارگیری فضای فرکانسی شود. تکنولوژی رادیوی شناختی با ویژگی اصلی بکارگیری روش اختصاص پویای فرکانس، پاسخی برای حل این چالش است. این رادیو با جستجوی فضای فرکانسی اطراف خود باید از بخشهای خالی طیف به نح...

Journal: :Journal of Plankton Research 2021

Abstract Long-term (2004–2020) studies showed yearly summer/autumn blooms in the NE Black Sea dominated by large (cell volume > 5000 ?m3) diatoms (Pseudosolenia calcar-avis and Proboscia alata). This phenomenon is characterized high (>250 W m?2 photosynthetically active radiation, PAR) insolation, low phosphorus concentrations (to analytical zero). These contained >100 chlo...

2008
B. P. Garry K. M. Pierce J. V. O’Doherty

A completely randomised design experiment was conducted to determine if grouphoused grower-finisher pigs (43.9 to 95 kg) show differences in performance and nitrogen utilisation when provided with a single high lysine diet (11 g/kg) or with a mean lysine concentration of 9.5 g/kg, either as a single diet or as a series of two or four diets. Four hundred and forty pigs were assigned to four diet...

1998
Daniel A. Sims Jeffrey R. Seemann Yiqi Luo

Introduction The rate and extent of leaf thickness and area Leaves which develop at elevated CO2 concentrations are development are important determinants of whole often thicker than those on ambient 2 plants. In a plant photosynthetic capacity. The interactive effects study of four Populus clones, Radoglou and Jarvis (1990) of photon flux density (PFD), nitrogen supply and CO 2 found increases...

Journal: :Alzheimers & Dementia 2023

Background Prior cross-sectional studies have revealed decreased macular perfusion density (PFD) and increased peripapillary PFD in Parkinson’s disease (PD). We assess longitudinal rate of change retinal microvascular structural parameters PD vs controls with normal cognition. Method Subjects were imaged using Zeiss Cirrus HD-5000 AngioPlex. Those confounding medical or ocular comorbidities exc...

2001
Scott E. Meninger Michael H. Perrott

Techniques are proposed to dramatically reduce the impact of quantization noise in fractional-N synthesizers, thereby improving the existing tradeoff between phase noise and bandwidth that exists in these systems. The key innovation is the introduction of new techniques to overcome nonidealities in a phase-frequency detector (PFD)/digital-to-analog converter (DAC) structure, which combines the ...

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