Jul 5, 2009

Fourier Acoustics: Sound Radiation and Nearfield Acoustical Holography

Fourier Acoustics: Sound Radiation and Nearfield Acoustical Holography
By Earl G. Williams

Publisher: Academic Press
Number Of Pages: 306
Publication Date: 1999-06-16
ISBN-10 / ASIN: 0127539603
ISBN-13 / EAN: 9780127539607
Binding: Hardcover


Intended a both a textbook and a reference, Fourier Acoustics develops the theory of sound radiation uniquely from the viewpoint of Fourier Analysis. This powerful perspective of sound radiation provides the reader with a comprehensive and practical understanding which will enable him or her to diagnose and solve sound and vibration problems in the 21st Century. As a result of this perspective, Fourier Acoustics is able to present thoroughly and simply, for the first time in book form, the theory of nearfield acoustical holography, an important technique which has revolutionised the measurement of sound. Relying little on material outside the book, Fourier Acoustics will be invaluable as a graduate level text as well as a reference for researchers in academia and industry.

Key Features
* The physics of wave propogation and sound vibration in homogeneous media
*Acoustics, such as radiation of sound, and radiation from vibrating surfaces
*Inverse problems, such as the theory of nearfield acoustical holography
*Mathematics of specialized functions, such as spherical harmonics

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Jul 1, 2009

2009 June Currency Review

2009 ခုႏွစ္ ဇြန္လ အတြင္းမွာ စကၤာပူေဒၚလာနဲ႕ ျမန္မာေငြ လဲလွယ္ႏံႈး တစ္လလံုး ပ်မ္းမွ် 762.6 က်ပ္ ေပါက္ခဲ႕ၿပီး ဇြန္လ 28 ရက္ေန႕မွာ အျမင္႕ဆံုး 785 က်ပ္ ထိ ေပါက္ခဲ႕ၿပီး၊ ဇြန္လ 8 ရက္နဲ႕ 9 ရက္ေန႕ေတြမွာ အနိမ္႕ဆံုး 745 က်ပ္ ေပါက္ခဲ႕ပါတယ္။

2009 ခုႏွစ္ ဇြန္လ အတြင္းမွာ အေမရိကန္ ေဒၚလာနဲ႕ စကၤာပူေဒၚလာ လဲလွယ္ႏံႈး တစ္လလံုး ပ်မ္းမွ် 1.451919 ေပါက္ခဲ႕ၿပီး ဇြန္လ 15 ေန႕မွာ အျမင္႕ဆံုး 1.46109 ထိ ေပါက္ခဲ႕ၿပီး၊ ဇြန္လ 2 ရက္ေန႕မွာ အနိမ္႕ဆံုး 1.43804 ေပါက္ခဲ႕ပါတယ္။

ျမန္မာေငြနဲ႕ စကၤာပူ ေဒၚလာ လဲလွယ္ႏံႈးကို ေမာင္လူေအး Sidebar ထဲက အခ်က္အလက္ေတြနဲ႕ ျပဳစုၿပီး အေမရိကန္ ေဒၚလာနဲ႕ စကၤာပူေဒၚလာ လဲလွယ္ႏံႈးကိုေတာ႕ http://www.exchange-rates.org ကေန ရယူပါတယ္ဗ်ား။


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