Noise - 2,325 entries found

Your search criteria are

• Noise

1984

CIS 85-1868 Protection of workers against noise and vibration in the working environment. Code of practice
La protection des travailleurs contre le bruit et les vibrations sur les lieux de travail. Recueil de directives pratiques [in French]
Third impression with modifications of the English version of this code. The French and Spanish versions issued in 1977 remain unchanged (see CIS 77-1282). This code of practice was adopted by a meeting of experts convened by the ILO. Intended to provide guidance for governments, employers and workers, it sets out the principles that should be followed for the control of workplace noise and vibration, and contains the information required for the establishment of control programmes for individual plants. Definitions are followed by chapters devoted to: general principles; organising principles of prevention; noise measurement and assessment (hearing conservation, oral communications, fatigue, measuring instruments, instrument accuracy and calibration, recording of data); noise limit levels (hearing impairment, ultrasound and infrasound, fatigue and comfort, etc.); vibration measurement; vibration limits; whole-body vibration; identification of risk areas; noise and vibration control; new equipment; noise and vibration control in the working environment; protective equipment and reduction of exposure time; health supervision. Appendices: international standards; information on health hazards of noise, ultrasound, infrasound and vibration; maximum allowable levels of ultrasound; noise hazard contours; signs indicating noise zones, etc.
International Labour Office, 1211 Genève 22, Switzerland, 1984. 90p. Illus. Bibl. Price: CHF 17.50.

CIS 85-2020 Grubert K., Haering H.U., Marchand D., Muth S.
Tightly fitting enclosures of electric furnaces for fume and noise control; experience gained with two 50t arc and two 15t induction furnaces
Einsatz enger Elektroofen-Einhausungen zur Abgaserfassung und Lärmminderung; Betriebserfahrungen an zwei 50-t-Lichtbogen- und zwei 15-t-Induktionsöfen [in German]
Report on the design and operation of tightly fitting enclosures for existing electric furnaces in different steelworks. In addition to the smoke and dust control, the noise reduction was increased by supplemental sound isolating and absorbing materials in the enclosure. The noise reduction amounted to 15-20dB(A), thus achieving or falling below a desirable noise level of 90dB(A). Problems due to high gas temperatures and heat radiation are mentioned. The investment costs are 2/3 of the costs of direct extraction with roof hoods.
Stahl und Eisen, 1984, Vol.104, No.5, p.235-239. Illus. 8 ref.

CIS 85-1860 Gruhl S., Költzsch P.
Designing quiet machinery and equipment - Fluid acoustical calculations; fundamentals, data banks, exercises, solutions
Lärmarmes Konstruieren - Strömungsakustische Berechnungen; Grundlagen, Wissensspeicher, Übungsaufgaben, Lösungen [in German]
This manual contains 14 exercises devoted to problems of fluid-mechanical noise generation and noise control. The emphasis is on free-jet noise and rotor noise. The results predict the sound power of fluid noise sources and aid in the design of noise control measures. Theoretical fundamentals are included in an appendix to help the student understand the physical principles involved.
Zentralinstitut für Arbeitsschutz, Gerhart-Hauptmann-Str. 1, 8020 Dresden, German Democratic Repubic, 1984. 110p. 16 ref. Price: M.8.60.

CIS 85-1859 Maling, G.C.
Inter-noise 84: Proceedings
This collection contains abbreviated versions of the 299 papers presented at the 13th International Conference on Noise Control Engineering (Honolulu, Hawaii, USA, 3-5 Dec. 1984). Research papers are grouped under the headings: emission (noise sources); physical phenomena; noise control elements; vibration (generation, transmission, isolation and reduction); immission (physical aspects of environmental noise, effects of noise); analysis; requirements. Twenty-one countries are members of the Conference; the Proceedings give a particularly broad view of the state of noise control technology in Japan.
Noise Control Foundation, Arlington Branch, P.O. Box 3469, Poughkeepsie, NY 12603, USA, 1984. 2 vols. 1426p. Illus. Bibl. Price: US$65.00.

CIS 85-1858 Noweir M.H.
Noise exposure as related to productivity, disciplinary actions, absenteeism, and accidents among textile workers
This study was carried out on 2458 workers exposed to average noise levels ranging from 80 to 99dBA. Workers in high noise exposure areas (>90dB) had more disciplinary actions and absenteeism and less productivity than workers in low noise exposure areas (<90dB). Of all the aspects studied, work rule violations showed the greatest difference between the high and low noise work areas, followed by productivity and absenteeism. The beneficial effects of noise abatement programmes in the textile industry are discussed.
Journal of Safety Research, Winter 1984, Vol.15, No.4, p.163-174. 13 ref.

CIS 85-1705 Alvarez Pascual E.
Grain-crop harvesters: study of health and safety risks
Maquinaria para cosechar granos: estudio de los riesgos higiénicos y de seguridad [in Spanish]
Identification of the major risks of grain-crop harvesters (noise, dust and heat). Other aspects covered: accident causes; safety standards, devices and procedures; personal protective equipment; recommendations.
Salud y trabajo, July-Aug. 1984, No.44, p.47-56. Illus.

CIS 85-1730 Wagner C., Zimmer B.
Research into occupational medicine concerning bus and tram drivers
Professiografische Untersuchungen von Omnibus- und Strassenbahnfahrern [in German]
The aim of this research was to establish an ergonomic profile of bus and tram (streetcar) drivers. Particular attention was paid to noise, whole-body vibration, morbidity and smoking habits. There was no evidence for either harmful noise or for whole-body vibration exceeding permissible levels. In 600 drivers examined, there was a significantly raised incidence of respiratory diseases of diseases affecting the digestive system and of obesity. In addition, there was a high level of sickness absenteeism and a proportion of smokers considerably higher than average in the German Democratic Republic. Conclusions are presented for the occupational physician. Recommendations include the necessity for regular medical examinations.
Verkehrsmedizin und ihre Grenzgebiete, 1984, Vol.31, No.2, p.66-74. 29 ref.

CIS 85-1573 Jegaden D.
Noise aboard ships: its effects on the hearing of merchant seamen
Bruit à bord des navires: son retentissement sur la fonction auditive des marins de commerce [in French]
This study involved 222 seamen (132 of whom were engine-room workers), who spend several months every year at sea. A noise evaluation of ships has shown that important differences exist between engine rooms and other areas aboard. Audiometric examinations showed that engine-room workers, exposed throughout the day to noise levels above 90dB(A), suffered hearing impairment (with peak impairment at 4000Hz), while the other seamen, whose exposure was in the 60-85dB(A) range, suffered from premature presbycusis. The periodic nature of work aboard (3 months work/2 months vacation) and the retirement age (55 years) account for the fact that the hearing damage suffered by engine-room workers is limited, despite the very high levels of noise they are exposed to. Emphasis is on noise control aboard ships, on medical surveillance of workers at risk and on audiometric examinations of engine-workers every two years.
Archives des maladies professionnelles, 1984, Vol.45, No.5, p.345-349. Illus. 6 ref.

CIS 85-1269 Mayr W.
Noise and noise control
Lärm und Lärmbekämpfung [in German]
This information note covers all aspects of the noise problem: the physiology of hearing, measurement principles, personal hearing protection, noise control, technical aspects of acoustics, noise measurement, evaluation of acoustic power, noise propagation in industrial premises, enclosure, silencers and screens, practical measures against noise, the mechanism of noise generation, vibration control, design of industrial premises. Appended: legislation and standards in Austria.
Allgemeine Unfallversicherungsanstalt, Abteilung für Unfallverhütung und Berufskrankheitenbekämpfung, Adalbert-Stifter-Strasse 65, 1200 Wien, Austria, no date. 55p. Illus. 6 ref.

CIS 85-1265 Gamberale F., Goldstein M., Kjellberg A.
Development and testing of a new matching procedure for assessment of subjective qualities of sound and noise
Utveckling och prövning av en ny metod att mäta upplevelse av ljud och buller [in Swedish]
The loudness of sounds was assessed by 3 matching procedures, 2 of which correspond to methods which are commonly used at present. The 3rd, the successive adjustment procedure (SAP), presents reference and matching sounds repeatedly at short intervals, and the matching is performed in successive steps. The SAP was more accurate than the other 2 methods; the regression bias, which implies that low intensities are overestimated and high ones underestimated, was less with the SAP than with the other methods. The SAP results show that the dB(A) scale is unsuitable for estimating the loudness of low-frequency noise: when 31.5Hz sound was matched against 1000Hz sound, the dB(A) scale underestimated the loudness of the low-frequency sound.
Arbetarskyddsstyrelsen, Publikationsservice, 171 84 Solna, Sweden, 1984. 30p. Illus. 11 ref.

CIS 85-1264 Degraeve B.
Ultrasound
Les ultrasons [in French]
Analysis of the harmful effects of ultrasound in its most common industrial applications (thermoplastics welding, cleaning baths, non-destructive materials testing). Biological, physiological and hearing effects in man; measurement and permitted exposure levels; medical and technical preventive measures.
Prévention et sécurité du travail, 2nd quarter 1984, No.141, p.50-60. Illus. 10 ref.

CIS 85-1440 Vyščipan V.F., Bazovkin P.S.
Setting of permissible levels for combined exposure to noise and local vibration
K voprosu normirovanija kombinirovannogo dejstvija lokal'noj vibracii i šuma [in Russian]
A new method of mathematical modelling has been elaborated for determining permissible levels of noise and local vibration when they are combined. 3 physiological parameters (noise sensitivity, vibration sensitivity, flicker fusion frequency) were measured in volunteers simultaneously exposed to noise and local vibration. The proposed mathematical formula enables permissible levels to be determined for combined exposure to noise and local vibration.
Gigiena truda i professional'nye zabolevanija, Mar. 1984, No.3, p.1-4. 10 ref.

CIS 85-977 Shackleton S., Piney M.D.
A comparison of two methods of measuring personal noise exposure
A hand-held sound level meter (SLM) and repeat noise dosimetry were used to measure noise exposure of workers in a steel foundry. The exposure of 37% of the noise-exposed population was either unmeasurable or was significantly underestimated by the SLM method. The advantages and disadvantages of the 2 measurement methods are discussed.
Annals of Occupational Hygiene, 1984, Vol.28, No.4, p.373-390. Illus. 17 ref.

CIS 85-971
(Gosudarstvennyj komitet SSSR po standartam)
Soundproofed cabins - General requirements
Kabiny zvukoizolirujuščie - Obščie trebovanija [in Russian]
This standard (effective 1 Jan. 1985) applies to soundproofed cabins used for the protection against noise emitted by industrial equipment and processes. It makes a classification of the cabins and lays down isolation criteria and general requirements for the design of the cabins (size, shape, location of the windows, sound-absorbent lining, air conditioning, lighting, colours, cable entries, doors, etc.).
Izdatel'stvo standartov, Novopresnenskij per. 3, 123840 Moskva, USSR, 1984. 6p. Price: Rbl.0.05.

CIS 85-670 Cassano F., Elia G.
Possibilities and limitations of individual hearing protection: insert-type hearing protectors
Possibilità e limiti della protezione acustica individuale: gli inserti auricolari [in Italian]
The noise reduction capacity of 3 types of earplug (glass down, plastic foam, rigid) was tested against 12 types of industrial noise (sound level range 92.9-111.9dB(A)) at 9 frequencies (range: 125-8000Hz). The noise attenuation power of the rigid earplug was significantly less than that of the other two types. The reduction in perceived noise level rarely exceeded 15dB(A) for any of the earplugs.
Rivista di medicina del lavoro ed igiene industriale, Apr.-June 1984, Vol.8, No.2, p.95-108. Illus. 11 ref.

CIS 85-897 New information in the occupational field - Results of research that can be implemented in practice
Arbeitswissenschaftliche Erkenntnisse - Forschungsergebnisse für die Praxis [in German]
Data sheets issued as supplements to the series already abstracted under CIS 84-1794. These sheets contain practical results derived from research on: safety of lone workers; improvement in in-plant transportation within large firms; technical equipment for the shunting of rail vehicles; measurement and reduction of noise produced by woodworking machines (double-end profilers, spindle moulders, multi-side planing machines, belt sanders, drum sanders, bench-type circular saws, choppers, chippers, multiple-blade circular saws).
Bundesanstalt für Arbeitsschutz, Vogelpothsweg 50-52, 4600 Dortmund 1, Federal Republic of Germany, 1984. 11 data sheets, 8-10p. each. Illus. Bibl.

CIS 85-657 Delin C.O.
Noisy work and hypertension
112 men who worked in the engine rooms of ships (noise level 100-115dB) were studied over an 8-year period. No significant relation was found between the prevalence of hypertension and either length of exposure to noise or the presence of severe hearing damage. Since hypertension was related to overweight, it is suggested that exposure to high noise levels does not lead to hypertension.
Lancet, 20 Oct. 1984, Vol.2, No.8408., p.931. 9 ref.

CIS 85-655 Hohmann B.W.
Studies of the risk of hearing damage due to impulse noise
Untersuchungen zur Gehörschädlichkeit von Impulslärm [in German]
Doctoral dissertation on the sensitivity of the ear to impulse noise and on the methods necessary for assessing the risk of hearing damage. Contents: physiological and metrological fundamentals; measuring equipment and methods of evaluating results; results of measurements in Swiss industry; acoustic data on weapons and industrial noise sources; hearing damage due to impulse and continuous noise (analysis of 250,000 cases studied by the Swiss National Accident Insurance Fund); injury caused by civilian and military explosive devices and firearms. The data suggest: that the scaling factor for impulse noise given by the relevant DIN/VDI standard overestimates the risk of injury; that impulse noise louder than 125dB(A) can permanently damage the inner ear; that, for impulse noise of short duration, analyses in 1/3-octave and octave bands are most appropriate.
Schweizerische Unfallversicherungsanstalt, Luzern, Switzerland. Mitteilungen der Sektion Physik, No.17, Sep. 1984. 144p. 96 ref. Illus.

CIS 85-654 Sebestyén B.
Complex noise reduction in the control room of an electrical furnace
Elektrokemence vezérlőhelyiségének komplex zajcsökkentése [in Hungarian]
Description of a sound absorption installation used in steel mills, which reduces sound levels from 120dB(AI) near the electric furnaces to 68dB(AI) in the control room. The installation involves 90mm-thick panels attached to the walls, floor and ceiling of the control room. The panels consist of a layer of mineral wool sandwiched between grouted woodchip panels.
Munkavédelem, munka- és üzemegészségügy, 1984, Vol.30, No.4-6, p.59-63. Illus.

CIS 85-368 Miller M.H., Silverman C.A.
Occupational hearing conservation
This textbook provides a multi-disciplinary approach to occupational hearing conservation programmes. Contents: historical and legislative background to noise abatement; development and organisation of the occupational hearing conservation programme; engineering aspects of noise control; physical environment for the performance of basic and follow-up audiometric studies; calibration of instruments; auditory effects of noise exposure; medical management of ear disease in an adult, noise-exposed population; audiometric and audiological aspects; personal hearing protection and employee education programmes. Appendices cover measurement and classification criteria and legislation.
Prentice-Hall, Inc., Englewood Cliffs, NJ 07632, USA, 1984. 270p. Illus. Bibl. Index. Price: US$49.90.

CIS 85-367 Helmkamp J.C., Talbott E.O., Margolis H.
Occupational noise exposure and hearing loss characteristics of a blue-collar population
A cross-sectional study was conducted with 197 workers from a noisy plant in Pittsburgh, USA (≥89dBA), to fully assess noise exposure and hearing loss, incorporating information on duration of exposure, noise level, occupational and medical histories, audiometric evaluation and external noise sources. Recent use of ototoxic drugs, noisy hobbies, second jobs, military service, family history of hearing loss and ear-related problems did not have a significant effect on hearing levels at high frequencies, suggesting that the hearing losses observed in the study were of occupational origin.
Journal of Occupational Medicine, Dec. 1984, Vol.26, No.12, p.885-891. 31 ref.

CIS 85-366 Sataloff J., Sataloff R.T., Menduke H., Yerg R., Gore R.P.
Hearing loss and intermittent noise exposure
12,000 US workers were screened to find 295 who complied with strict criteria, the most important of which was intermittent noise exposure. Most of the subjects were exposed to jackhammer noise that peaked at about 118dBA. The study revealed a pattern of very severe hearing loss in high frequencies but relatively no or little loss in the lower frequencies. It is speculated that frequent rest periods permit the ear to protect itself from damage in the speech frequencies.
Journal of Occupational Medicine, Sep. 1984, Vol.26, No.9, p.649-656. 10 ref.

CIS 85-365 Soued A.
Noise in French weaving mills - Survey results
Le bruit dans les ateliers de tissage en France - Résultat d'enquêtes [in French]
Noise levels were measured in 35 weaving mills (approx. 4800 looms). The average sound level is everywhere over 92dB(A), showing practically no improvement over the past 10 years. This paper outlines objectives for loom manufacturers and users which, if reached, would reduce noise levels. Results of the survey are given in detail, classified by region.
Cahiers de notes documentaires - Sécurité et hygiène du travail, 4th quarter 1984, No.117, Note 1503-117-84, p.475-490. Illus. 2 ref.

CIS 85-364 Lahti T., Pekkarinen J., Starck J.
New noise level definition: acting on impulse
A study funded by the Academy of Finland has recommended that impulse noise be defined as noise for which the difference between the peak level on the A scale, L_AP, and the root-mean-square slow time-weighted level, L_AS, is equal to or greater than 15dB. This definition has been approved by an unidentified international symposium. The exposure of persons to impulse noise in various trades and the relation of the impulse noise to equivalent continuous noise are discussed.
Work Health Safety 1984, Institute of Occupational Health, Haartmaninkatu 1, 00290 Helsinki, Finland, no date, p.26-27. Illus.

CIS 85-363 Minter S.G.
Hearing conservation and noise control: A sound investment in employee health
The elements and conduct of cost-effective hearing conservation programmes in a power generation company, a petroleum company and a foundry division in the USA are described.
Occupational Hazards, July 1984, Vol.46, No.7, p.35-39. Illus.

CIS 85-352 Taylor B.A.
Contranoise - active noise control
Active noise control (ANC) is based on the active attenuation of a noise field by the generation and injection of an additional noise field which is everywhere in anti-phase and at the same power level, thereby cancelling the original noise. Two main approaches to this technique are described, with their advantages and limitations. The 1st method processes the original sound to generate a "contranoise". The other method is based on synchronised, synthesised ANC cancellation.Research projects in this field are considering the application of the ANC principles to exhaust systems of standby diesel generators and vibration-related problems.
Noise and Vibration Control Worldwide, Nov. 1984, Vol.15, No.9, p.256-259. Illus.

CIS 85-69 Cantineau A.
Noise in the working environment
Le bruit en milieu de travail [in French]
The first paragraphs deal with noise in general, with the human hearing system, and with occupational disorders caused by noise. Noise sources in the building industry and in civil engineering are discussed (e.g. noisy machinery), as are measuring instruments and the maximum permissible exposure to noise during the normal working day. Discussion of principal control measures and of relevant characteristics of materials used in construction.
Cahiers des Comités de prévention du bâtiment et des travaux publics, 1984, n°4, p.26-33. Illus.

CIS 85-68 McQueen D.H.
Noise control in steelworks
New techniques for noise control of electric arc and induction furnaces are presented, and new sound absorbing materials are suggested for use (ceramics, plastics and polymers).
Noise and Vibration Control Worldwide, May 1984, Vol.15, No.4, p.119-122. 4 ref.

CIS 85-67 Mustatea S.V.
A calculator program dealing with decibels
This programme designed for a TI-59 programmable calculator will perform octave band level combinations, addition or substraction of noise levels and calculation of L_eq and L_ex. The programme listing is given in full.
Noise and Vibration Control Worldwide, Mar. 1984, Vol.15, No.2, p.49-54. 3 ref.

CIS 85-64
(Hauptverband der gewerblichen Berufsgenossenschaften)
Noise
Lärm [in German]
These regulations apply to enterprises where workers are exposed to noise. Contents: responsibilities of employers for the reduction of noise, the provision of hearing protectors, the elimination of accident risks due to noise, warning signs for noisy areas, work restrictions.
Carl Heymanns Verlag KG, Gereonstrasse 18-32, 5000 Köln 1, Federal Republic of Germany, 1 Oct. 1984, 6+11p. Price: DM.1.60.

CIS 85-63 Habenstreit H.
Airborne and structure-borne noise emitted by gear transmissions
Luft- und Körperschall bei Zahnradgetrieben [in German]
To reduce noise, it is essential to calculate precisely the spectrum and power of the sound produced before machinery is designed. Part 1 of this article examines the basis for these calculations, the theory of how gear-transmission noise is produced, the acoustic principles involved, the characteristic noise levels and the measurement of airborne noise (particularly, by applying the coherence method). Part 2 deals with the possibilities of noise reduction during the design phase, especially by reducing the meshing noise. A modal analysis is given of the gearbox for a further reduction in noise levels.
Schweizerische technische Zeitschrift, 1984, No.20, p.18-23, and No.21, p.16-21. Illus. 12 ref.

CIS 85-62
International Non-ionizing Radiation Committee of the International Radiation Protection Association
Interim guidelines of human exposure to airborne ultrasound
These guidelines are primarily aimed at protecting against exposure from devices emitting ultrasounds. Adverse health effects have been reported only at frequencies below 100kHz and nearly all below 50kHz. The standard has therefore been limited to 1/3 octave bands with mid-frequencies ranging from 20 to 100kHz. Exposure limits are provided for workers and the general public. The rationale for the exposure limits and protective measures are also set out.
Health Physics, Apr. 1984, Vol.46, No.4, p.969-974. Bibl.

CIS 85-60 Körpert K., Raber A.
Evaluation of the proportion of overexposed workers and of the cost of total noise protection in Austrian enterprises
Abschätzung des Anteils überexponierter Arbeitnehmer und der Kosten für totalen Lärmschutz in österreichischen Betrieben [in German]
A theoretical model, described elsewhere, used to estimate the proportion of workers exposed to noise, is adapted to real conditions. The application of this model to Austrian data shows good agreement with the real situation, with deviations no greater than 3.8%. Using this model we obtain 2 to 7 billion Austrian Schillings (approx. US$100-350 million) as an estimate of the cost of reducing industrial noise levels to below 85dB(A).
Zeitschrift für Lärmbekämpfung, 1984, Vol.31, p.107-112. Illus. 7 ref.

CIS 85-58 Sinclair A., Smith T.A.
A three-frequency audiogram for use in industry
A 3-frequency hearing test (at 1, 2 and 4kHz) is suggested as adequate for audiometric screening of workers exposed to noise. Workers whose hearing threshold is above 20dB at any one of these frequencies can be considered to have "failed" the test. A comparison of this test with an 8-frequency test preceded by history and examination (done on 150 workers who "failed" the 3-frequency test) revealed a high degree of concordance between the results of the 2 tests.
British Journal of Industrial Medicine, Aug. 1984, Vol.41, No.3, p.401-405. Illus. 12 ref.

CIS 84-2089 Legislative and regulatory texts: conditions of work, occupational safety and health; prevention of technical hazards, fire, environmental protection, list of safety equipment suppliers
Textes législatifs et réglementaires: conditions de travail, sécurité, hygiène; prévention des risques techniques, incendie, protection de l'environnement, répertoire des fournisseurs de la sécurité [in French]
This special issue follows that of July-Aug. 1983 (CIS 83-2093). It provides a consolidation of OSH laws and regulations published in France between June 1983 and June 1984. The texts are grouped into: (A) Conditions of work, safety and health: occupational accidents, the workplace air, noise, OSH committees, lighting, training, institutions representing employees, rights of workers, occupational diseases, industrial medicne; (B) prevention of technical risks; agriculture, pressure vessels, construction, electricity, building site machinery, gas installations, lifting and handling, machines, radioactive substances, mines and quarries; ionising radiation, dangerous substances, aerial ropeways and cables, agricultural and forestry tractors; (c) fires; (D) protection of the environment; (E) measuring instruments, standardisation; safety equipment suppliers.
Revue de la sécurité, July-Aug. 1984, Vol.20, No.213, p.6-181. Illus.

CIS 84-1860 Hansen D.J.
Earplugs - A computer program for simulation of personal hearing protection devices
Written in Basic, this programme allows the user to compare the attenuation capabilities of any hearing protection device versus the environmental octave band analysis for a given workplace and provides a plot of the results. The programme listing is reproduced in its entirety.
American Industrial Hygiene Association Journal, Mar. 1984, Vol.45, No.3, p.154-155. 2 ref.

CIS 84-1569 Woodford C.M.
The effect of calibration tolerance values on obtained audiometric threshold: A hearing conservation perspective
Auditory threshold was assessed at 6 commonly used test frequencies (1000, 2000, 3000, 4000, 6000 and 8000Hz) and for frequencies just within calibration tolerances for frequencies above and below these. Observed differences of up to 23dB in obtained auditory threshold values resulted from variation in frequency within tolerances. These findings are discussed in terms of their importance in industrial hearing conservation.
American Industrial Hygiene Association Journal, Feb. 1984, Vol.45, No.2, p.110-116. 24 ref.

CIS 84-1568 Behar A., Plener R.
Noise exposure - Sampling strategy and risk assessment
Description of a procedure based on the NIOSH sampling protocol to assess the risk of hearing loss of a large population by measuring the noise exposure of statistically representative sample of this population. Different degrees of risk can be assessed as the percentage of workers with exposure <85dBA, >90dBA or between 85 and 90dBA.
American Industrial Hygiene Association Journal, Feb. 1984, Vol.45, No.2, p.105-109. 7 ref.

CIS 84-1565 Ferekidis E., Papafrangos K., Adamopoulos G., Pantazopoulos P.
New objective measuring method for testing hearing protectors
Eine neues objektives Messverfahren bei der Prüfung von Gehörschützern [in German]
In addition to comfort and worker acceptance, attenuation is a decisive property in the choice of hearing protectors. Attenuation of sound reaching one (test) ear can be determined by measuring the stapedius reflex of the other (reference) ear. This reflex is a movement of the eardrum caused by contraction of the muscles of the inner ear; it can be measured by plugging the reference ear with a pressure-sensing device. Results with and without various protective devices (medical cotton, glass fibre earplugs, wax earplugs) in the test ear showed that the threshold of the stapedius reflex increases with increasing attenuation, but also with the frequency of the applied sound (500-4000Hz). The advantages of the method are that it does not require judgements by the person being tested, and does not require expensive auxiliary facilities such as special testing chambers.
Zeitschrift für Lärmbekämpfung, 1984, Vol.32, No.3, p.63-66. Illus. 6 ref.

CIS 84-1563 Martin R.
Noise measurement, noise evaluation
Geräuschmessung, Geräuschbeurteilung [in German]
Review and analysis of international studies and standards published in 1983. Topics: standards and directives, noise-measuring instruments, methods of noise measurement (emission and immission), evaluation and effects of noise (harmful and irritant effects, auditory and extra-auditory effects).
VDI-Z, 1984, Vol.126, No.14, p.539-545. 70 ref.

CIS 84-1560 Reducing noise: Example of an engineering study on the soundproofing of an electric generator set
Réduire le bruit: un exemple d'étude pour l'insonorisation d'un groupe électrogène [in French]
A study on the soundproofing of a 250kVA emergency generator set, to reduce the noise in adjacent offices. The dimensions of the task were defined by setting a limit on tolerable noise and determining the intensity and sources of emitted noise. Soundproofing the generator room and equipping the engine of the generator set with a reactive muffler reduced the noise level by 17dB(A).
Revue de la sécurité, Jan.-Feb. 1984, Vol.20, No.208, p.38-43. Illus.

CIS 84-1501 Cocheo V., Valsecchi M., Peretti A., Coato F.
Fork lift trucks. Chemical pollution, noise, vibration
Chariots de manutention. Pollution chimique, bruit, vibrations [in French]
Report of a study on a selection of diesel and electric fork lift trucks, simulating current industrial practice. Description of the premises and tests; methods and test equipment; pollutants tested for (NO_x, carbon monoxide, aldehydes, total fumes, polycyclic aromatic hydrocarbons). Results: 1.Diesel trucks produce significant pollution; for an enclosed, non-ventilated area (1000m³) the maximum allowable concentrations of oxides of carbon and of total fumes were reached in less than an hour. 2. Diesel trucks are much more noisy than electric ones, with noise levels at low frequencies exceeding the NR 85 (ISO) curve. 3. For both types of truck, and depending on the type of tyres used, vibration levels can exceed permitted levels.
Cahiers de notes documentaires - Sécurité et hygiène du travail, 2nd quarter 1984, No.115, Note No.1474-115-84, p.159-168. Illus. 11 ref.

CIS 84-1476 Contemporary ergonomics 1984
Proceedings of the Ergonomics Society Conference held in Exeter, United Kingdom, 2-5 Apr. 1984. The papers presented cover: application of ergonomics; ergonomics and communication; selection and training; work physiology; human variability; ergonomics in product development; transport control; industrial noise.
Ergonomics, 1984, Supplement No.1 to Vol.27. 278p. Illus. Bibl.

CIS 84-1165 Industrial toxicology, effect of noise and the prevention of hearing damage
Industriële toxicologie, invloed van lawaai en preventie gehoorschade [in Dutch]
Reports of several Dutch institutions on their research activity in 1981 and their research proposals for 1982-1986: the Dutch industrial toxicology information system; literature surveys; studies on formaldehyde, acrylonitrile and brain cancer; biological monitoring of exposed workers and early diagnosis of health impairment (phenol, styrene, lead, cadmium; haematology); determination of vinyl chloride in air; industrial hygiene studies on lead and paints; biological monitoring of workers exposed to soluble chromates; detection of industrial carcinogens; toxicology of behaviour-modifying chemicals; determination of the effects of neurotoxic substances; extra-auditory effects of industrial noise; cutaneous absorption of chemicals; strategies for the measurement of atmospheric pollutants; measurement of total dust; passive samplers.
Directoraat-Generaal van de Arbeid, Balen van Andelplein 2, 2273 KH Voorburg, Netherlands, Mar. 1984. 50p. Illus.

CIS 84-940 Duclos J.C., Lafon J.C., Dubreuil C., Olivier P., Bergeret A.
Effect of occupational noise on maternity
Influence du bruit professionnel sur la maternité [in French]
Retrospective study of 192 records of a maternity ward (for the years 1979-1980) where the majority of women were workers, some of whom had been exposed to noise. The records of pregnancy, delivery and neonatal pathology showed no correlation between noise exposure and maternal or neonatal abnormalities, including auditory defects among the children.
Journal de toxicologie médicale, 1984, Vol.4, No.1, p.7-14. 7 ref.

CIS 84-665 Mätysalo S., Vuori J.
Effects of impulse noise and continuous steady state noise on hearing
The hearing effects induced by occupational exposure to various kinds of noise in Finnish industry were compared. 3 groups exposed to impulse noise for various lengths of time, 1 group exposed to continuous steady-state noise, and a control group were studied. The effects of exposure to impulse noise for up to 4 years and to continuous noise for approx. 5 years are the same (highest hearing threshold at 6000Hz symmetrically in both ears); exposure to impulse noise for 5-6 years can induce a permanent threshold shift at 4000Hz and 6000Hz; exposure to impulse noise for 7-10 years may result in permanently raised thresholds within the entire hearing range. The effects on the left and right ear were different.
British Journal of Industrial Medicine, Feb. 1984, Vol.41, No.1, p.122-132. Illus. 17 ref.

CIS 84-374 Probst W.
Noise reduction in workplaces with sound-absorbing plastic sheet
Lärmminderung an Arbeitsplätzen durch Absorber aus Kunststoff-Folie [in German]
Sound levels in factories were measured before and after installation of ceilings with plastic sound-absorbing elements. The measurements showed that noise reductions of >10dB(A) are attainable. A study of the effect of machine placement in the shops on the degree of noise reduction attainable by ceiling treatment gave results that differed with the geometry and acoustic topography of the room. A marked reduction in noise was seen in tiled workplaces in the food industry.
Zeitschrift für Lärmbekämpfung, 1984, Vol.31, No.1, p.15-20. Illus. 4 ref.

CIS 84-362 Gawron V.J.
Noise: Effect and aftereffect
Results of 2 experiments. In the 1st, 48 students completed 5 paper-and-pencil performance tests under noisy (85dBA) or quiet (45dBA) conditions. In the 2nd, 24 students filled out questionnaires rating their moods and reactions to the environment under the conditions of experiment 1. Noise had statistically verifiable effects and aftereffects on the subjective ratings of the subjects, but none on their performance.
Ergonomics, Jan. 1984, Vol.27, No.1, p.5-18. 48 ref.

CIS 84-356 Bitsch J., Roure L., Jacques J., Poirot R.
Pneumatic rammers with an "extension handle" - Study of vibration and noise reduction
Fouloirs pneumatiques à "manche allongé" - Etude de la réduction des vibrations et du bruit [in French]
A pneumatic rammer with acceptable vibration and noise levels was developed. This rammer would reduce the osteoarticular problems and hearing discomfort associated with such machines generally, without reducing its flexibility and compacting power. The prototype functioned with vibration levels of less than 15m/s² and noise levels below 85dB(A).
Cahiers de notes documentaires - Sécurité et hygiène du travail, 1st quarter 1984, No.114, Note No.1465-114-84, p.35-45. Illus. 16 ref.

CIS 84-355 Schommer A.
Noise reduction in machinery and equipment - Some examples
Réduction du bruit de machines et de matériels - Quelques exemples [in French]
Noise can be reduced by using "primary devices", which reduce noise production at the source, and "secondary devices", which reduce the transmission of noise. Practical applications of both types are shown for noise-reducing methods for fans, regulating valves (both "primary") and for electric motors, gas burners, earthmoving equipment, roller mills, fettling drums and vibrating chutes (all "secondary").
Cahiers de notes documentaires - Sécurité et hygiène du travail, 1st quarter 1984, No.114, Note No.1464-114-84, p.25-33. Illus. 9 ref.

1983

CIS 90-719 Noise Abatement (Hearing Conservation in Workplaces) Regulations 1983 [Australia - Western Australia]
Regulations issued under authority of the Noise Abatement Act 1972. Contents: measurement and evaluation of noise at workplaces; reduction of noise levels; reduction of noise exposure L_eq A8; site identification of noise hazards; suitable hearing protection; hearing tests and medical examinations; management of hearing conservation activities. In the schedules: forms used for the register of designated workers and the annual statistical summary of reference audiometry.
Government Gazette of Western Australia, 21 Oct. 1983, No.77, p.4237-4258.

< previous | 1... 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 ...47 | next >