نتایج جستجو برای: tissue mechanical and acoustical parameters

تعداد نتایج: 16962694  

2014
Jukka Liukkonen Juha Töyräs

Introduction: Quantitative high-frequency ultrasound has been successfully used for the evaluation of articular cartilage e.g. reveal osteoarthritis related changes. During the degenerative process mechano acoustical properties of cartilage change: surface roughness, collagen and proteoglycan contents, and the density are affected. These changes can be detected as changes in variation of ultras...

Journal: :journal of biomedical physics and engineering 0
a. norouzpour md, eye research center, khatam-al-anbia eye hospital, mashhad university of medical sciences (mums), mash- had, iran z. hooshyar msc, department of mechanical engineering, mechanical engineering college, shiraz univer- sity, shiraz, iran a. mehdizadeh md-phd, department of medical physics, school of medicine, shiraz university of medical sci- ences (sums), shiraz, iran university of mash- had, mashhad, iran

background: autoregulation of blood flow is a marvelous phenomenon balanc- ing blood supply and tissue demand. although many chemically-based explanations for this phenomenon have been proposed and some of them are commonly used today, biomechanical aspects of this phenomenon was neglected. the biomechanical aspect provides insights to us to model vessel diameter changes more precisely and comp...

2011
Jason R. Cook Richard R. Bouchard Stanislav Y. Emelianov

In both photoacoustic (PA) and ultrasonic (US) imaging, overall image quality is influenced by the optical and acoustical properties of the medium. Consequently, with the increased use of combined PA and US (PAUS) imaging in preclinical and clinical applications, the ability to provide phantoms that are capable of mimicking desired properties of soft tissues is critical. To this end, gelatin-ba...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مهندسی 1392

flow in natural river bends is a complex and turbulent phenomenon which affects the scour and sedimentations and causes an irregular bed topography on the bed. for the reason, the flow hydralics and the parameters which affect the flow to be studied and understand. in this study the effect of bed and wall roughness using the software fluent discussed in a sharp 90-degree flume bend with 40.3cm ...

Journal: :علوم و تکنولوژی پلیمر 0
فهیمه خیاطان شهریار حجتی امامی نرگس زارع مهرجردی حسین بهاروند

collagen is the major protein component of cartilage, bone, skin and connective tissue and constitutes the major part of the extracellular matrix. collagen type i has complex structural hierarchy, which consists of treepolypeptide α-chains wound together in a rod-like helical structure. collagen is an important biomaterial, finding many applications in the field of tissue engineering. it has be...

Journal: :Applied Acoustics 2022

There is a general lack of understanding on the accuracy theoretical and empirical models which can be used to predict acoustical properties unsaturated granular media. It also unclear how well these are suited for parameter inversion in application In this work three popular prediction available commercial software packages, e.g. COMSOL Multiphysics, invert key non-acoustical parameters two ty...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده مهندسی 1389

abstract type-ii fuzzy logic has shown its superiority over traditional fuzzy logic when dealing with uncertainty. type-ii fuzzy logic controllers are however newer and more promising approaches that have been recently applied to various fields due to their significant contribution especially when the noise (as an important instance of uncertainty) emerges. during the design of type- i fuz...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علوم بهزیستی و توانبخشی - دانشکده توانبخشی 1393

abstract objectives gradual increase length and complexity of utterance (gilcu) therapy method is a form of operant conditioning. this type of treatment is very precise and controlled that is done in 54 steps in 3 speech situations consisted of monologue, reading and conversation. this study aimed to examine the effects of gilcu treatment method on reduction of speech dysfluency of school-age...

Journal: :The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science 1920

2011
Monika BIĽOVÁ Ervin LUMNITZER

Acoustical parameters of porous materials give the necessary and important information for noise control engineers. Profound knowledge their physical characteristics enable an effective sound absorber material design. The theory of sound-absorbing materials has progressed considerably during the last decade. A noise control engineer with serious interest in sound absorbing technology is advised...

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