A Method for Reducing Ground Reflection Effects from Acoustic Measurements PDF Download
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Author: Jere A. Noerager
Publisher:
ISBN:
Category : Absorption of sound
Languages : en
Pages : 78
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Book Description
The method involved placing foam blocks on the ground between sound source and receiver in an approximation of the wedges in an anechoic chamber. The tests were performed out of doors as a function of the receiver height and source-receiver separation distance. The spacing between blocks and the extent of ground covered were varied to estimate the optimum placement and minimum amount of foam treatment needed. Base-line tests without foam were also performed. It was found that the foam treatment reduced the amplitude of the peaks and valleys in the sound pressure spectra substantially. The foam was least effective at low frequency, especially for the low receiver height and for large source-receiver distances. Results from the base-line tests were compared with theoretically predicted results. These base-line test results were in reasonable agreement with those from theory.
Author: Jere A. Noerager
Publisher:
ISBN:
Category : Absorption of sound
Languages : en
Pages : 78
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Book Description
The method involved placing foam blocks on the ground between sound source and receiver in an approximation of the wedges in an anechoic chamber. The tests were performed out of doors as a function of the receiver height and source-receiver separation distance. The spacing between blocks and the extent of ground covered were varied to estimate the optimum placement and minimum amount of foam treatment needed. Base-line tests without foam were also performed. It was found that the foam treatment reduced the amplitude of the peaks and valleys in the sound pressure spectra substantially. The foam was least effective at low frequency, especially for the low receiver height and for large source-receiver distances. Results from the base-line tests were compared with theoretically predicted results. These base-line test results were in reasonable agreement with those from theory.
Author:
Publisher:
ISBN:
Category : Earthquake hazard analysis
Languages : en
Pages : 532
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Book Description
Author: Joanie Simon
Publisher: Page Street Publishing
ISBN: 1645672565
Category : Photography
Languages : en
Pages : 332
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Book Description
Shoot Stunning, Professional Food Photography that Looks Good Enough to Eat! Snapping unbelievably gorgeous food photos has never been simpler than with Picture Perfect Food, your all-in-one guide to delicious-looking images from prolific photographer and educator, Joanie Simon. Whether you’re an up-and-coming food blogger, looking to break into commercial photography or capturing food just for fun (and your Instagram account), this approachable collection of tutorials will have you taking tantalizing and tasty shots with every snap of the shutter. No matter if you’re using your phone, your fanciest DSLR or any camera in between, you’ll gain complete confidence as you expand your technical knowledge and grow your artistic eye, creating awe-inspiring images that dazzle the senses. With her cheerful teaching style, Joanie walks you through each element of a masterful food photo in chapters devoted to Camera Settings, Light and Shadow, Story, Props Styling, Composition, Food Styling and Finding Inspiration. Learn how to find the best light in your house for standout shots and to delve into the shadows to create a moody and mesmerizing atmosphere; discover how to compose the elements in your scenes through color theory and visual weight for unforgettable images that capture and hold the eye; and uncover the secrets of styling sensational salads and stunning soups and keeping your cool when shooting frozen foods, among other essential tricks of the trade. With camera in hand and Joanie’s expert guidance at your fingertips, tackle every photography challenge with confidence and take your food photos from meh to mouthwatering in no time.
Author: Robert G. Hamlin
Publisher: Business Science Reference
ISBN: 9781522561552
Category : Organizational behavior
Languages : en
Pages : 0
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Book Description
Without change, there can be no progress. To influence change, organizations attempt to harmonize internally and become accustomed to dealing with a variety of situations that may require a number of solutions. Evidence-Based Initiatives for Organizational Change and Development discusses what helps or hinders the organizational-change-and-development-related agency and provides practical insights and lessons to be learned from many reflections on evidence-based OCD practice. Featuring research on topics such as human resource development, organizational behavior, and management consultancy, this book is ideally designed for business academics, organizational change leaders, line managers, HRD professionals, OD/management consultants, and executive coaches seeking coverage on the implementation of OCD intervention strategies and the associated changes in management processes.
Author: Kurt R. Schuermann
Publisher: Westminster John Knox Press
ISBN: 9780664501495
Category : Religion
Languages : en
Pages : 152
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Book Description
Kurt Schuermann writes with humor and grace about the everyday happenings in a pastor's life. After being forced to purge his book collection by a move to a smaller office, Schuermann discovers a dark truth about himself: he is addicted to ten-step books. In this book he collects the things that he has found to be true since he threw away his collection of ten-step and how-to books. Topics of the fifty-two reflections include the minister's call, church-growth seminars, and the local church.
Author: Sean Arbabi
Publisher: Amphoto Books
ISBN: 0817400206
Category : Photography
Languages : en
Pages : 226
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Book Description
Exposure. It’s essential to producing high-quality photographs, but mastering exposure is difficult. At last there’s a BetterPhoto guide to exposure, packed with BetterPhoto’s signature assignments, diagrams, tips, and illustrations. It’s like a full-scale photography course between the covers of the book–all taught the BetterPhoto way, just like photographers learn at the top photography-instruction site on the web. There’s plenty of information here on both digital and film photography, discussing how different file formats affect exposure, how to adjust digital files, color correction, combining digital exposures, and much more. The author’s stunning full-color photographs make this hardworking guide as inspiring as it is instructive.
Author:
Publisher:
ISBN:
Category : Coasts
Languages : en
Pages : 994
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Book Description
Author: Hema Singh
Publisher: Cambridge University Press
ISBN: 1107092612
Category : History
Languages : en
Pages : 354
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Book Description
This book discusses the active and passive radar cross section (RCS) estimation and techniques to examine the low observable aerospace platforms. It begins with the fundamentals of RCS, followed by the dielectric, magnetic and metamaterials parameters of the constituent materials and then explains various methods and the emerging trends followed in this area of study. The RCS estimation of phased array including the mutual coupling effect is also presented in detail in the book. The active RCS reduction is carefully touched upon through the performance of phased arrays, sidelobe cancellers and mitigation of multipath effect. Providing information on various adaptive algorithms like least mean square (LMS), recursive least square (RLS) and weighted least square algorithms, the authors also mention the recent developments in the area of embedded antennas, conformal load bearing antenna, metamaterials and frequency selective surface (FSS) based RCS reduction.
Author: Wayne I. Klemetti
Publisher:
ISBN:
Category : Ionospheric electron density
Languages : en
Pages : 106
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Book Description
Low latitude observations of VLF/LF pulse reflections from the lower ionosphere obtained at nine locations to the east and west of a transmitter in southeastern Brazil are described. The data provide a variety of information on the reflection properties of the ionosphere below about 90 km altitude. Aspects of the data are presented in quasi-dimensional formats useful for identifying ionosphere structure and variability, and detailed analyses of portions of the data provided, which characterize the effective heights of the reflection coefficients of the ionosphere at noon and midnight, over a frequency range from 15 to 65 kHz. Electron density models of the ionosphere, derived from VLF/LF reflection data are also discussed. Keywords: VLF propagation; LF Propagation; Ionosphere reflectivity d region.
Author: U.S. Coast and Geodetic Survey
Publisher:
ISBN:
Category :
Languages : en
Pages : 998
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Book Description
