منابع مشابه
High Frequency Signal Attenuation through Materials
Due to the growth of high-frequency signal usage in recent years, limiting the coverage of these signals in the common household environment has become an issue. The paper proposes a set of simulations and measurements aiming to determine the attenuation of the GSM and Wi-Fi signals as they pass through different types of construction materials. Using MATLAB Simulink© and experimental studies u...
متن کاملHigh-frequency effective viscosity of hard-sphere suspensions.
• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website. • The final author version ...
متن کاملHigh-frequency viscosity of concentrated porous particles suspensions.
We determine the high-frequency limiting shear viscosity, eta(infinity), in colloidal suspensions of rigid, uniformly porous spheres of radius a as a function of volume fraction phi and (inverse) porosity parameter x. Our study covers the complete fluid-state regime. The flow inside the spheres is modeled by the Debye-Bueche-Brinkman equation using the boundary condition that fluid velocity and...
متن کاملHigh frequency attenuation measurements of lipid encapsulated contrast agents.
A number of recent studies have indicated the potential of ultrasound contrast agent imaging at high ultrasound frequencies. However, the acoustic properties of microbubbles at frequencies above 10 MHz remain poorly understood at present. In this study we characterize the high frequency attenuation properties of (1) BR14, (2) BR14 that has been mechanically filtered (1 and 2 microm pore sizes) ...
متن کاملHigh frequency skin ultrasonography in systemic sclerosis
Background: Systemic sclerosis is an autoimmune connective tissue disorder which is characterised by cutaneous and internal organ fibrosis. Raynaud’s phenomenon is the earliest feature and may precede the onset of the disease by months to years. The heart, lungs, gastrointestinal tract, kidneys and other organs may be involved. Our aim was to evaluate skin thickness and echogenicity in systemic...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1953
ISSN: 0001-4966
DOI: 10.1121/1.1917691