منابع مشابه
channel estimation for mimo-ofdm systems
تخمین دقیق مشخصات کانال در سیستم های مخابراتی یک امر مهم محسوب می گردد. این امر به ویژه در کانال های بیسیم با خاصیت فرکانس گزینی و زمان گزینی شدید، چالش بزرگی است. مقالات متعدد پر از روش های مبتکرانه ای برای طراحی و آنالیز الگوریتم های تخمین کانال است که بیشتر آنها از روش های خاصی استفاده می کنند که یا دارای عملکرد خوب با پیچیدگی محاسباتی بالا هستند و یا با عملکرد نه چندان خوب پیچیدگی پایینی...
Absolute parameters of the eclipsing binary V 821 Cas from UBVRI light curves and radial velocities . ⋆ †
We present UBVRI photometric measurements and spectroscopic observations of the double-lined eclipsing binary V821Cas. The radial velocities were obtained by means of the cross-correlation technique. Simultaneous analyses of the multi-band light curves and RVs give the absolute parameters for the stars as: M1=2.05±0.07 M⊙, M2=1.63±0.06 M⊙, R1=2.31±0.03 R⊙, R2=1.39±0.02 R⊙, Teff1=9400±400 K, and...
متن کاملBinary Liquids under Absolute Negative Pressure
We would like to give a brief review concerning liquid-liquid equilibrium in binary liquid mixtures under absolute negative pressure. Although negative pressure states are metastable ones, they can be maintained long enough to make phase equilibrium measurements. Several phenomena concerning liquid-liquid equilibrium can be seen only – or can be seen better – under negative pressure; these are ...
متن کاملAbsolute Magnitude Calibration for the W Uma - Typecontact Binary Stars
Hipparcos parallax data for 19 contact binary stars of the W UMa-type (with M V < 0:25) are used to check the previous absolute-magnitude calibration of the form M V = M V (log P; B ? V), and to derive a new one. The new calibration covers the ranges 1:7 < M V < 5:5, and gives practically identical predictions for M V as the previous one, although it is based on entirely independent M V data, w...
متن کاملAripiprazole-Cyclodextrin Binary Systems for Dissolution Enhancement: Effect of Preparation Technique, Cyclodextrin Type and Molar Ratio
Objective(s): The aim of this work was to investigate the effect of the natural and the chemically modified form of cyclodextrins namely; β-cyclodextrin (β-CD) and hydroxypropyl-β-cyclodextrin (HP-β-CD) respectively on the solubility and dissolution rate of aripiprazole; an antipsychotic medication showing poor aqueous solubility. Materials and Methods: Phase solubility of ar...
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ژورنال
عنوان ژورنال: Astronomy and Astrophysics Supplement Series
سال: 1997
ISSN: 0365-0138,1286-4846
DOI: 10.1051/aas:1997367