نتایج جستجو برای: equivalent sound level
تعداد نتایج: 1290264 فیلتر نتایج به سال:
Speech sounds are not always perceived in accordance with their acoustic-phonetic content. For example, an early and automatic process of perceptual repair, which ensures conformity of speech inputs to the listener's native language phonology, applies to individual input segments that do not exist in the native inventory or to sound sequences that are illicit according to the native phonotactic...
Research evidence suggests that annoyance, sleep disturbance and other health effects of road traffic noise exposure may be related to the level and number of noise events caused by traffic as well as to energy equivalent measures of exposure. Because measurements show that the variation in noise emission between vehicles within the same category can be considerable, it is essential that the in...
In this paper, we design, simulate, and build an ultrasonic heat generator. In thermoacoustics, heat generated by the passage of alternating current through a thin conductor produces a sound wave. In this method, unlike other methods of sound production, moving parts are not used to vibrate air molecules, and as a result, the frequency response of these generators is flatter than other sound ge...
SUMMARY This document describes the basis of the computer model currently used by the CAA to generate contour maps of aircraft noise exposure level around airports. Developed from the earlier Noise and Number Index (NNI) model, this now produces contours of Equivalent Sound Level (Leq) in dB(A). The main difference between the procedures used to compute these two noise indices lies in the algor...
The paper will introduce the advantages of using the Object-Oriented Model for conceptual modeling, as a kind of knowledge model to capture information system properties. Next, the paper will explain how to properly implement such a system description in an advanced ORACLE environment, using ORACLE v7 as server and Developer/2000 as execution model tool. The main contribution is the definition ...
background: noise is one of the most important harmful agents in work environment. noise pollution in oil refinery industries is related to workers' health. this study aimed to determine the overall noise pollution of an oil refinery operation and its frequency analysis to determine the control plan for a vent noise in these industries. methods: this experimental study performed in control unit...
We evaluated two hypothetical codes for sound-source location in the auditory cortex. The topographical code assumed that single neurons are selective for particular locations and that sound-source locations are coded by the cortical location of small populations of maximally activated neurons. The distributed code assumed that the responses of individual neurons can carry information about loc...
OBJECTIVES This study investigated the actual situation of noise and low-frequency sounds in firework events and their impact on pyrotechnicians. METHODS Data on firework noise and low-frequency sounds were obtained at a point located approximately 100 m away from the launch site of a firework display held in "A" City in 2013. We obtained the data by continuously measuring and analyzing the e...
This research aimed to investigate ESP oral reading miscues by 3 major groups reading three domain-specific texts from qualitative/quantitative, integrative and direct perspectives via Goodman’s Reading Miscue Inventory (2005, Y.M. Goodman). The three different domain-specific texts were justified as equivalent in terms of readability, vocabulary frequency, rhetorical organization, genre, level...
workplace factors such as sound must have the minimum impact on the operators of combine harvester, so that they can guide and control many functions of the combine. in this study, some factors affecting the noise generated by two combine harvesters john deere 1055 and sampo 3065 were evaluated. research factors were engine speed, gear ratios, type of operation and microphone distance. the resu...
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