Book Description
This digital document is a journal article from Building and Environment, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
The design of a building should cover necessary investigations to provide comfort conditions, in terms of physical properties such as light, sound and heat. The acoustical comfort conditions in an architectural space significantly depend on the sound insulation performance of the building envelope. The first step in providing a building envelope which will be sufficient in terms of sound insulation, is to select the wall materials having required sound transmission loss values. The aim of this paper is to present a graphic method to determine the required minimum sound reduction index (R"t"r) of building envelope components, depending on road traffic noise, room function and transparency ratio of the facade. ... Read more

Book Description
This digital document is an article from The Register-Guard (Eugene, OR), published by The Register Guard on May 12, 2004. The length of the article is 948 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.

Citation Details
Title: Forest Service again considers ban on gas-powered boats at Waldo Lake.(Environment)(Noise is the chief complaint as the government refloats an idea it dropped in 2001)
Publication: The Register-Guard (Eugene, OR) (Newspaper)
Date: May 12, 2004
Publisher: The Register Guard
Page: A1

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Product Description
This is a NAVAL POSTGRADUATE SCHOOL MONTEREY CA report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A982724. The abstract provided by the Pentagon follows: This thesis examines the performance of the waveforms specified by the IEEE 802.11a wireless local area network standard when the signal is transmitted over a Ricean fading channel with AWGN and pulsed noise interference. The pulsed interference is assumed to have constant average power and is either fading or nonfading. The probability of bit error is conditional on the received signal to noise power ratio, which is modeled as a random variable. The probability density function of this random variable is obtained either analytically or numerically for each modulation type, and the probability of bit error is evaluated as the expected value of the conditional probability. In one case, use is made of a new technique for the numerical inverse of the Laplace transform in order to evaluate numerically the signal to noise ratio probability density function. Due to the complexity of the analysis when both the signal and the interference are subject to Ricean fading, the analysis was simplified by assuming Ricean signal fading with Rayleigh interference fading and vice versa. The results of the analysis show that performance is affected by the degree of signal fading and also depends on the pulsed interference duty cycle. The signal to interference power ratio affects the way performance depends on these two factors. ... Read more

Book Description
This book contains 58 papers presented at the Fourth International Conference on Urban Transport and the Environment for the 21st Century, held in Lisbon, Portugal, August 31-September 1, 1998.

The latest in a highly successful series of conference proceedings on the topic, the book contains contributions from engineers, scientists and managers working in industry, research organizations and government on the development of new technologies, planning and management of urban transportation systems. The papers included represent studies from around the world covering the latest developments in urban transport research and its environmental aspects such as air and noise pollution, and economic and social impacts. ... Read more

Book Description
This digital document is an article from General Accounting Office Reports & Testimony, published by Thomson Gale on January 1, 2008. The length of the article is 575 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.

Citation Details
Title: Aviation and the Environment: Impact of Aviation Noise on Communities Presents Challenges for Airport Operations and Future Growth of the National Airspace System.
Author: Gale Reference Team
Publication: General Accounting Office Reports & Testimony (Report)
Date: January 1, 2008
Publisher: Thomson Gale
Volume: 2008Issue: 1Page: NA

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Product Description
This International Standard describes the determination of the acoustical quantities, especially the type and locations of sound pressure level measurements to be conducted, the time sampling and frequency analysis required and the special characteristics of the noise to be considered. The purpose is to allow an assessment of the noise in the working environment with respect to its various effects on the worker as a result of daily habitual exposure. This International Standard is intended to be used by appropriate authorities responsible for specifying and monitoring compliance with noise limits at the workplace and for deciding on the need for hearing conservation programmes and noise reduction measures. It does not by itself specify or recommend acceptable noise limits. The standard does not specify statistical sampling procedures to characterize the noise exposure of groups, although references to such procedures are included in the bibliography. The applications of the measurement results are described with respect to the effects of noise on hearing, interference with communication and other effects of noise. Special requirements for the description of infrasound and ultrasound exposure are included. Applications of the Standard to evaluate effects of the noise on health, working efficiency, well-being and the audibility of warning signals are summarized in Annex A. Annex B gives examples of equivalent continuous A-weighted sound pressure level calculations. Annex C discusses calculation of the rating level including tone and impulsive adjustment. Annex D specifies classes of accuracy for noise measurements. All the annexes are informative. ... Read more

Book Description
This digital document is a journal article from Building and Environment, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
A total of 14,235 noise levels measurements were utilized in developing statistical models that have the capability to predict different noise levels including: equivalent, maximum, or minimum noise level in terms of parameters affecting each level. Different parameters expected to have an effect on noise levels were collected. These parameters included traffic volume, composition of traffic, traffic speed, horn using effect, number of lanes, width of lanes, approach width, road slope, and pavement surface texture. The parameters affecting each noise level were selected based on simple correlation matrices, scatter plots, and statistical t-test. Different forms of models were evaluated for each noise level. The best model describing the relationship between each noise level and parameters affecting it are presented in this paper. The reliability of the nonlinear developed models were judged based on coefficient of multiple determination (R^2), the significance of each variable at @a-level of 0.05, and the standard error of the estimates. While the reliability of linear developed models were judged based on the general linear regression tests represented by F-value and t-value in addition to the coefficient of multiple determination (R^2), the significance of each variable at @a-level of 0.05, and the standard error of the estimates. Based on the analysis of the collected data, three groups of models were developed. The first group of models predicts the equivalent noise level in terms of traffic volume, traffic speed, distance, heavy vehicles and British Pendulum Number (BPN). The second group presents models that describe the relationships between maximum noise levels, heavy vehicles and use of horn. While, the third group presents minimum noise level prediction models in terms of BPN and lane width. A verification of the developed models was performed by comparing the predictive noise levels with those measured at different sites. Results of this verification indicated that the developed models were found to have good prediction capability. ... Read more