نتایج جستجو برای: molar refractivity

تعداد نتایج: 37619  

Journal: :Complexity 2022

To avoid exorbitant and extensive laboratory experiments, QSPR analysis, based on topological descriptors, is a very constructive statistical approach for analyzing the numerous physical chemical properties of compounds. Therefore, we presented some new entropy measures which are sum neighborhood degree vertices. Firstly, made partition edges benzene derivatives neighboring vertices then comput...

Journal: :Applied sciences 2022

In this paper, a method for estimating atmospheric refractivity from sea and land clutters is proposed. To estimate the refractivity, clutter power spectrums based on an artificial tri-linear model are calculated using Advanced Refractive Prediction System (AREPS) simulator. Then, again obtained measured data AREPS actual operation, spectrum reflectivity can be replaced with real-time collected...

Journal: :journal of dental school, shahid beheshti university of medical sciences 0
حسن علی شفیعی hassan ali shafiee dental school, shahid beheshti university of medical sciences, tehran- iran.دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی مرتضی قنبرزاده morteza ghanbarzadeh محمدرضا نخستین mohammadreza nakhostin dental school, shahid beheshti university of medical sciences, tehran- iran.دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی مسعود سیفی massoud seifi dental school, shahid beheshti university of medical sciences, tehran- iran.دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی

objective: the present study assessed the association of size, axial angulation, developmental stage and bud position of the mandibular third molar with the second molar impaction in patients with mandibular second molar impaction. methods: in this descriptive-analytical study (case-control design), dental records of 5,420 patients in the age range of 12-15 years who underwent orthodontic treat...

Journal: :Journal of Applied Meteorology and Climatology 2011

2005

The paper describes possibilities of refractive index height profile estimations using field measurement at a receiver site of a terrestrial point-to-point link in terms of angleof-arrival (AOA) spectra. Several refractivity models based on orthogonal function set are introduced to improve the estimation accuracy.

1999
X. Zou F. Vandenberghe B. Wang M. E. Gorbunov Y.-H. Kuo S. Sokolovskiy J. C. Chang J. G. Sela R. A. Anthes

The development of small, high-performance instruments to receive Global Positioning System (GPS) signals has created an opportunity for active remote sounding of the Earth’s atmosphere by radio occultation techniques. A prototype demonstration of this capability has been provided by the GPS Meteorology (GPS/MET) experiment. Although it was shown that high vertical resolution profiles of atmosp...

Journal: :The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science 1917

Journal: :Progress In Electromagnetics Research B 2011

Journal: :The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2015

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