نتایج جستجو برای: attenuation relationships

تعداد نتایج: 275770  

2014
Amanda Phelan

Public health nurses in Ireland are charged with conducting a home visit to every postnatal mother within 48 hours of hospital discharge. This represents the beginning of a long-term relationship, not only with the mother and newborn child but also with the family. This article fundamentally demonstrates the essential work of the public health nurse in promoting the health of the baby within a ...

2011
Daniel V. Moik Reinhard Fässler Angelika Vollmar Vaibhao C. Janbandhu

Ehrenwörtliche Versicherung Diese Dissertation wurde selbständig, ohne unerlaubte Hilfe erarbeitet. III Für meine Frau, meine Tochter, und meine ganze Familie. This thesis founds on the following manuscripts, which are referred to as Moik et al. 2011a or b, respectively. (2011). Loss of migfilin expression has no overt consequences on murine development and homeostasis, J Cell Sci124, 414-21. R...

1996
Nicolas W. Martin

Some experimental results measuring P-wave phase velocity and seismic attenuation in laboratory under dry and water-saturated conditions at ultrasonic frequencies and atmospheric pressure on sandstone samples of the Milk River Formation in the Writingon-Stone Provincial Park (WOSPP), southern Alberta, are presented and are correlated with petrophysical data obtained from these samples as clay c...

M. Amoui, M. Hosntalab, M.R. Teimoori Sichani, Sh. Akhlaghpoor,

Background: In this study, Quantitative 32P bremsstrahlung planar and SPECT imaging and consequent dose assessment were carried out as a comprehensive phantom study to define an appropriate method for accurate Dosimetry in clinical practice. Materials and Methods: CT, planar and SPECT bremsstrahlung images of Jaszczak phantom containing a known activity of 32P were acquired. In addition, Phanto...

C. Olaru, G.V. Ormenisan, M. Zadehrafi, S.A. Ciobanu,

Background: Lead glass has a wide variety of applications in radiation protection. This study aims to investigate some characteristics of lead glass such as the γ-ray energy-dependent mass and linear attenuation coefficients, the half-value layer thickness, and the absorbed dose distribution for specific energy. Materials and Methods: The attenuation parameters of different lead glass types aga...

Journal: :iranian journal of radiation research 0
a. vahidian kamyad department of mathematic, ferdowsi university, mashad, iran m.h. noori eskandari department of mathematic, ferdowsi university, mashad, iran m. naji midani department of medical physics, mashad university for medical sciences, mashad, iran m. hajizadeh saffar department of medical physics, mashad university for medical sciences, mashad, iran

background: photon attenuation as an inevitable physical phenomenon influences on the diagnostic information of spect images and results to errors in accuracy of quantitative measurements. this can be corrected via different physical or mathematical approaches. as the correction equation in mathematical approaches is nonlinear, in this study a new method of linearization called ‘piece wise line...

2014
G. A. Abers K. M. Fischer G. Hirth D. A. Wiens T. Plank B. K. Holtzman C. McCarthy E. Gazel

Seismic attenuation measurements provide a powerful tool for sampling mantle properties. Laboratory experiments provide calibrations at seismic frequencies and mantle temperatures for dry meltfree rocks, but require 10210 extrapolations in grain size to mantle conditions; also, the effects of water and melt are not well understood. At the same time, body wave attenuation measured from dense bro...

ژورنال: سلامت کار ایران 2015

Background and aims:  X-band microwave with 8-12.5 frequency range has various applications such as air control traffic, navy communication and etc. Uncontrolled exposure with microwave can lead to adverse effect on workers. Application of the shielding is superior control for prevention of microwave exposure.The aim of this study is production a new electromagnetic shielding for exposure contr...

Dariyush Shahbazi-Gahrouei Ehsan Khodamoradi Kourosh Ziaie Zahra Shahi

  Introduction:  The use of radioactive iodine (131I) has become an important adjunct to the treatment of thyroid cancer and hyperthyroidism. Salivary gland has the ability to concentrate radioactive iodine under normal circumstances. Salivary gland dysfunction and dry mouth are the common side effectsof high-dose radioiodine therapy. The purposeof this stu...

2007
Hamza Güllü Ergun Erçelebi

This paper presents an application of neural network approach for the prediction of peak ground acceleration (PGA) using the strong motion data from Turkey, as a soft computing technique to remove uncertainties in attenuation equations. A training algorithm based on the Fletcher–Reeves conjugate gradient back-propagation was developed and employed for three sample sets of strong ground motion. ...

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