نتایج جستجو برای: pll

تعداد نتایج: 2263  

2003
B. LEVINE ANTONIO OJEDA

Previous studies on the genetic transmission of the capacity for an immune response have shown that there is a statistically significant relation between the abilities of parents and of offspring to respond to a given antigen (1-3). Mendelian genetic patterns were not observed, however, possibly because of the structural complexity of the immunizing antigens employed. Poly-L-aamino acids and ha...

2016
Li Cong Xin Li Tian Jin Song Yue Rui Xue

As the weak link in global navigation satellite system (GNSS) signal processing, the phase-locked loop (PLL) is easily influenced with frequent cycle slips and loss of lock as a result of higher vehicle dynamics and lower signal-to-noise ratios. With inertial navigation system (INS) aid, PLLs' tracking performance can be improved. However, for harsh environments with high dynamics and signal at...

ژورنال: :علوم و فناوری دریا 0
سید محمدرضا موسوی میرکلائی استاد دانشکده مهندسی برق، دانشگاه علم و صنعت ایران عبدالجبار کمالی دانشجوی کارشناسی ارشد دانشکده مهندسی برق، دانشگاه علم و صنعت ایران

gps دقیق ترین روش را برای ناوبری، اندازه گیری سرعت و تعیین مکان برای دریانوردان فراهم می کند. برای اندازه گیری دقیق فاز حامل سیگنال ها از حلقه قفل فاز (pll) استفاده می شود. حلقه کاستاس یکی از انواع pll است که به دلیل بار محاسباتی کم و ساختار و معماری ساده، آن یکی از پر استفاده ترین pllها در گیرنده gps شده است. نویز فاز و دینامیک بالا بر روی طراحی pll تاثیر می گذارد. برای ردیابی سیگنال های دینام...

2015
T. Flouri F. Izquierdo-Carrasco D. Darriba A.J. Aberer L.-T. Nguyen B.Q. Minh A. Von Haeseler A. Stamatakis

We introduce the Phylogenetic Likelihood Library (PLL), a highly optimized application programming interface for developing likelihood-based phylogenetic inference and postanalysis software. The PLL implements appropriate data structures and functions that allow users to quickly implement common, error-prone, and labor-intensive tasks, such as likelihood calculations, model parameter as well as...

Journal: :Carbohydrate polymers 2012
Marta Westwood Andrew R Kirby Roger Parker Victor J Morris

A quartz crystal microbalance with dissipation monitoring (QCMD) has been used to monitor the adsorption and structure of lysozyme monolayers and multilayers, and poly-L-lysine (PLL)-polygalacturonic acid (PGalA) multilayers at a solid-liquid interface using freshly-cleaved mica as a substrate. QCMD measurements were complemented with atomic force microscopy (AFM). AFM images revealed that lyso...

Journal: :The Journal of Experimental Medicine 1975
B R Bloom E Shevach

The question whether B lymphocytes are capable of being activated by antigen in the absence of functional T cells was investigated in a model that excludes participation of T cells by virtue of an immune response gene restriction. Strain 2 guinea pigs are capable of responding to immunization with DNP-PLL, whereas strain 13 animals are not. In the present experiments, animals of both strains we...

2016
Yuehua Zhang Wu Lei Yujuan Xu Xifeng Xia Qingli Hao

A novel, simple and selective electrochemical method was investigated for the simultaneous detection of dopamine (DA) and uric acid (UA) on a poly(l-lysine)/graphene oxide (GO) modified glassy carbon electrode (PLL/GO/GCE) by differential pulse voltammetry (DPV). The electrochemically prepared PLL/GO sensory platform toward the oxidation of UA and DA exhibited several advantages, including high...

Journal: :Energies 2023

The moving average filter-based phase-locked loop (MAF-PLL) can obtain grid synchronization signals accurately under adverse conditions with a large amount of harmonics due to the high filtering capability MAF. However, MAF-PLL cannot achieve fast dynamic response in case frequency drift, phase angle steps, and unbalanced voltage sag. MAF is essentially an FIR filter, its performance hard be ad...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی خواجه نصیرالدین طوسی 1390

در این پایان نامه یک سنتزکننده فرکانسی از نوع حلقه قفل فاز کسری-n با فرکانس خروجی 2.4 ghz تا 2.5 ghz طراحی و شبیه سازی شده است. در این pll از مدولاتور دیجیتال دلتا-سیگما برای ایجاد عدد کسری استفاده شده است. پهنای باند pll برابر با 60 khzانتخاب شده است. با طراحی بهینه برای قسمت فرکانس بالای تقسیم کننده فرکانسی، مقدار توان مصرفی آن به 4.37 mw کاهش داده شده است. این تقسیم کننده می تواند فرکانس ورو...

2006
DIARY R. SULAIMAN

This work concerns with the design and analysis of phase locked loops (PLLs). In the last decade a lot of works have been done about the analysis of PLLs. The phase locked loops are analyzed briefly, second order, third order, and fourth order. In practically the design of 1.3 GHz, 1.9V second order PLL is considered. SPICE simulation program results confirm the theory. Key-Words: Phase Locked ...

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