نتایج جستجو برای: optical density ratios

تعداد نتایج: 772017  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید بهشتی 1386

چکیده ندارد.

ژورنال: مجله دندانپزشکی 2002
طلایی پور, احمدرضا, باشی زاده فخار, حوریه , دباغی, آرش ,

Nowadays, bone mass estimation, through imaging methods, is widely used in metabolic diseases diagnosis and treatment. One of these methods is called "optical densitometry" which estimates bone density by measuring the intensity of the transmitted light on different parts of a radiographic image. Digital radiography systems act similarly by determining grey levels of the image. The aim of this ...

Journal: :مهندسی متالورژی و مواد 0
نگار عباسی اول خدیجه فرجام حسین آقاجانی

in this study, the effect of grain size on nitrogen diffusion into ck45 has been investigated. in order to obtain different grain sizes, samples were annealed and normalized at various temperatures and durations.the grain size was determined with clemex vision software. then, the specimens were exposed to dc plasma nitriding treatment and again analyzed by optical microscope ,scanning electron ...

Journal: :The British journal of radiology 2007
K M Blackmore J A Knight R Jong L Lilge

Risk assessment by parenchymal density pattern, a strong physical indicator of future breast cancer risk, is available with the onset of mammographic screening programmes. However, due to the use of ionizing radiation, mammography is not recommended for use in younger women, thereby rendering risk assessment unattainable at an earlier age. Visible and near infrared light was used on 292 women w...

Journal: :Monthly Notices of the Royal Astronomical Society 2023

ABSTRACT We present the first results from an imaging and a spectroscopic survey of optical emission associated with supernova remnant (SNR) G107.5−1.5. discovered diffuse filamentary G107.5−1.5 using 1.5- 1-m telescopes. The emissions North-East (NE) North-West (NW) regions show structure, while South-East (SE) East (E) structure. From long-slit spectra, we found [S ii]/H α > 0.5 for SE...

2003
J. Ferreira

We investigate the emissivity properties of the main near-IR transitions of the Fe ion in the conditions prevailing in the inner regions of jets from young stars, based on a simplified 16-level atom model. We present new diagnostic diagrams involving prominent near-IR line ratios that allow us to constrain the electronic density, temperature, and Fe gas phase abundance ratio, independently of t...

Journal: :Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 2000

Journal: :International Journal of Electrical and Computer Engineering 2022

In this paper, the bandwidth density of misaligned free space optical interconnects (FSOIs) system with and without coding under a fixed bit error rate is considered. particular, we study effect using correction codes various codeword lengths on misalignment tolerance FSOIs in presence higher order modes. Moreover, paper demonstrates use fill factor detector array as design parameter to optimiz...

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