Attenuation of ultrasonic noise in the 10–16 kHz frequency range by earplugs
نویسندگان
چکیده
منابع مشابه
A New High Frequency Grid Impedance Estimation Technique for the Frequency Range of 2 to150 kHz
Grid impedance estimation is used in many power system applications such as grid connected renewable energy systems and power quality analysis of smart grids. The grid impedance estimation techniques based on signal injection uses Ohm’s law for the estimation. In these methods, one or several signal(s) is (are) injected to Point of Common Coupling (PCC). Then the current through and voltage of ...
متن کاملNoise attenuation and proper insertion of earplugs into ear canals.
OBJECTIVES The study was done to determine whether the noise attenuation attained with the use of earplugs can be improved by teaching the proper insertion of earplugs to users. METHODS Fifty-four randomly selected male subjects were divided into an untrained group (25 persons) and a trained group (29 persons). The trained group was given a lecture on earplug insertion and allowed to practise...
متن کامل[Assessment of the impulse noise attenuation by earplugs in metalworking processes].
BACKGROUND The aim of the study was to answer the question of whether earplugs provide sufficient protection in the exposure to impulse noise generated during metalworking processes. MATERIAL AND METHODS The noise generated by die forging hammer and punching machine was characterized. Using an acoustic test fixture, noise parameters (LCpeak, LAmax) under 24 earplugs, foam, winged and no-roll,...
متن کاملstudy of cohesive devices in the textbook of english for the students of apsychology by rastegarpour
this study investigates the cohesive devices used in the textbook of english for the students of psychology. the research questions and hypotheses in the present study are based on what frequency and distribution of grammatical and lexical cohesive devices are. then, to answer the questions all grammatical and lexical cohesive devices in reading comprehension passages from 6 units of 21units th...
The Calibration of Hydrophones by a Novel Optical Technique in the Frequency Range 10 Khz to 600 Khz
This paper presents a technique for the absolute calibration of hydrophones using a novel optical method. The method uses a thin, optically reflecting membrane suspended in the acoustic field to allow optical measurement of the acoustic particle velocity using a Doppler interferometer. The hydrophone under test is then substituted for the pellicle, and the hydrophone response to the known acous...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Medycyna Pracy
سال: 2018
ISSN: 0465-5893,2353-1339
DOI: 10.13075/mp.5893.00721