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  Subjects -> ENVIRONMENTAL STUDIES (Total: 755 journals)
    - ENVIRONMENTAL STUDIES (690 journals)
    - POLLUTION (22 journals)
    - TOXICOLOGY AND ENVIRONMENTAL SAFETY (34 journals)
    - WASTE MANAGEMENT (9 journals)

ENVIRONMENTAL STUDIES (690 journals)            First | 1 2 3 4 5 6 7     

Journal of Environmental Education     Hybrid Journal   (3 followers)
Journal of Environmental Engineering and Landscape Management     Hybrid Journal   (6 followers)
Journal of Environmental Extension     Full-text available via subscription  
Journal of Environmental Health     Full-text available via subscription   (3 followers)
Journal of Environmental Law     Hybrid Journal   (16 followers)
Journal of Environmental Management     Hybrid Journal   (18 followers)
Journal of Environmental Management and Tourism     Open Access   (2 followers)
Journal of Environmental Planning and Management     Hybrid Journal   (16 followers)
Journal of Environmental Policy & Planning     Hybrid Journal   (19 followers)
Journal of Environmental Professionals Sri Lanka     Open Access  
Journal of Environmental Protection     Open Access   (5 followers)
Journal of Environmental Science and Health, Part A: Toxic/Hazardous Substances and Environmental Engineering     Hybrid Journal   (4 followers)
Journal of Environmental Science and Health, Part B: Pesticides, Food Contaminants, and Agricultural Wastes     Hybrid Journal   (8 followers)
Journal of Environmental Science and Natural Resources     Open Access   (2 followers)
Journal of Environmental Science and Technology     Open Access   (6 followers)
Journal of Environmental Sciences     Full-text available via subscription   (3 followers)
Journal of Environmental Statistics     Open Access   (2 followers)
Journal of Environmental Studies and Sciences     Partially Free  
Journal of Environmental Sustainability     Open Access  
Journal of Ethnic and Migration Studies     Hybrid Journal   (13 followers)
Journal of Exposure Science and Environmental Epidemiology     Hybrid Journal   (11 followers)
Journal of Freshwater Ecology     Hybrid Journal   (9 followers)
Journal of Great Lakes Research     Hybrid Journal   (7 followers)
Journal of Green Building     Full-text available via subscription   (6 followers)
Journal of Happiness Studies     Hybrid Journal   (11 followers)
Journal of Hazardous Materials     Hybrid Journal   (8 followers)
Journal of Health Management     Hybrid Journal   (8 followers)
Journal of Health Organisation and Management     Hybrid Journal   (4 followers)
Journal of Housing and the Built Environment     Hybrid Journal   (2 followers)
Journal of Human Behavior in the Social Environment     Hybrid Journal   (7 followers)
Journal of Industrial Ecology     Hybrid Journal   (13 followers)
Journal of Integrative Environmental Sciences     Hybrid Journal   (3 followers)
Journal of Intercultural Studies     Hybrid Journal   (7 followers)
Journal of Iron and Steel Research, International     Full-text available via subscription   (7 followers)
Journal of Leadership Studies     Hybrid Journal   (11 followers)
Journal of Lesbian Studies     Hybrid Journal   (2 followers)
Journal of Management and Sustainability     Open Access   (5 followers)
Journal of Material Cycles and Waste Management     Hybrid Journal   (3 followers)
Journal of Modern African Studies     Hybrid Journal   (8 followers)
Journal of Natural and Environmental Sciences     Open Access   (2 followers)
Journal of Natural Resources Policy Research     Hybrid Journal   (12 followers)
Journal of Natural Sciences Research     Open Access   (3 followers)
Journal of Near-Death Studies     Hybrid Journal   (3 followers)
Journal of Occupational and Environmental Hygiene     Hybrid Journal   (3 followers)
Journal of Operational Oceanography     Full-text available via subscription   (3 followers)
Journal of Organizational Behavior     Hybrid Journal   (17 followers)
Journal of Pharmacological and Toxicological Methods     Hybrid Journal   (3 followers)
Journal of Policy Analysis and Management     Hybrid Journal   (12 followers)
Journal of Popular Music Studies     Hybrid Journal   (8 followers)
Journal of Renewable and Sustainable Energy     Hybrid Journal   (12 followers)
Journal of Research in Forestry, Wildlife and Environment     Open Access  
Journal of Safety Engineering     Open Access   (3 followers)
Journal of Safety Research     Hybrid Journal   (4 followers)
Journal of School Violence     Hybrid Journal   (5 followers)
Journal of Southern African Studies     Hybrid Journal   (8 followers)
Journal of Sustainable Development     Open Access   (10 followers)
Journal of Sustainable Development Studies     Open Access   (7 followers)
Journal of Sustainable Society     Open Access   (6 followers)
Journal of the American Planning Association     Hybrid Journal   (19 followers)
Journal of the Atmospheric Sciences     Full-text available via subscription   (20 followers)
Journal of the IEST     Full-text available via subscription  
Journal of the North Atlantic     Full-text available via subscription   (1 follower)
Journal of Theological Studies     Open Access   (8 followers)
Journal of Tropical Ecology     Hybrid Journal   (8 followers)
Journal of Urban and Environmental Engineering     Open Access  
Journal of Vietnamese Environment     Open Access   (1 follower)
Julius-Kühn-Archiv     Open Access  
Kleio     Full-text available via subscription   (2 followers)
Knowledge Management Research & Practice     Hybrid Journal   (13 followers)
Koedoe : African Protected Area Conservation and Science     Open Access   (7 followers)
L1-Educational Studies in Language and Literature     Open Access   (2 followers)
Lake and Reservoir Management     Hybrid Journal   (4 followers)
Landscape Ecology     Hybrid Journal   (26 followers)
Landscapes     Hybrid Journal   (17 followers)
Large Marine Ecosystems     Full-text available via subscription   (1 follower)
Latin American and Caribbean Ethnic Studies     Hybrid Journal   (3 followers)
Latin American Journal of Management for Sustainable Development     Hybrid Journal  
Legal Studies     Hybrid Journal   (3 followers)
Leviathan : A Journal of Melville Studies     Full-text available via subscription  
Limnological Review     Open Access   (6 followers)
Living Reviews in Landscape Research     Open Access   (2 followers)
Local Environment: The International Journal of Justice and Sustainability     Hybrid Journal   (6 followers)
Low Carbon Economy     Open Access   (4 followers)
Luna Azul     Open Access  
M+A. Revista Electrónica de Medioambiente     Open Access  
Macquarie Journal of International and Comparative Environmental Law     Full-text available via subscription   (7 followers)
Madagascar Conservation & Development     Open Access  
Management International Review     Hybrid Journal   (5 followers)
Management of Environmental Quality: An International Journal     Hybrid Journal   (4 followers)
Marine Ecology     Hybrid Journal   (13 followers)
Marine Environmental Research     Hybrid Journal   (12 followers)
Marine Pollution Bulletin     Hybrid Journal   (11 followers)
Materials for Renewable and Sustainable Energy     Open Access   (7 followers)
Mathematical and Computational Forestry & Natural-Resource Sciences     Free  
Mathematical Population Studies: An International Journal of Mathematical Demography     Hybrid Journal   (2 followers)
Medieval Sermon Studies     Hybrid Journal   (5 followers)
Medio Ambiente y Urbanizacion     Full-text available via subscription  
Membranes     Open Access   (4 followers)
Midwest Studies In Philosophy     Hybrid Journal   (11 followers)
Mine Water and the Environment     Hybrid Journal   (6 followers)

  First | 1 2 3 4 5 6 7     

Noise Notes    [5 followers]  Follow    
  Full-text available via subscription Subscription journal
     ISSN (Print) 1475-4738
     Published by Multiscience Homepage  [31 journals]
  • Prediction of jet noise for realistic flow problems using large eddy
           simulation
    • Abstract: A systematic procedure is described to predict the noise emissions from realistic aero-propulsive jets. Large Eddy Simulation (LES) is used to compute the jet flowfield and coupled with the Ffowcs Williams and Hawkings (FW-H) equation for far-field noise predictions. A low-dissipation fifth-order upwind biased finite-volume reconstruction procedure is used along with selective fourth order inviscid flux blending. Higher order explicit time integrators are used for enhanced wave propagation. Also, non-contiguous block interfacing is employed to eliminate the traditional limitations of structured grid topologies for complex geometries. For simple jet configurations the LES/FW-H method is validated with University of Mississippi's National Center for Physical Acoustics (NCPA) experimental measurements. Four unique and more realistic applications are then shown. The first is a hot faceted jet with lobed corrugations, followed by an over-expanded military gas turbine engine exhaust with and without chevrons. Then a twin jet impinging on a jet blast deflector is shown, and lastly are two high aspect-ratio nozzles, one with and one without a bevel. The LES/FW-H methodology is shown to produce reasonable agreement with experimental measurements at modest grid resolutions. Details are discussed about the selected example problems highlighting the challenges associated with applying the tools to realistic geometries and jet configurations.
      Content Type Journal Article
      Category Research Article
      Pages 27-54

      DOI 10.1260/1475-4738.12.2.27

      Authors
      Neeraj Sinha, Combustion Research and Flow Technology, Inc., Pipersville, PA 18947 USA
      James P. Erwin, Combustion Research and Flow Technology, Inc., Pipersville, PA 18947 USA
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 12
      Journal Issue Volume 12, Number 2 / June 2013
      PubDate: Fri, 12 Jul 2013 15:35:52 GMT
       
  • A Comparison of Measurement Standard Methods for the Sound Insulation of
           Building Façades
    • Abstract: This paper focuses on the limits of measurement of the sound insulation of building façades at low frequencies. Three standard methods are compared mainly for the position of the equipment. In particular, the positions proposed by the international standard ISO 140-5 and the national standards ASTM E 966 (USA) and JIS A 1430 (Japan) are considered. The limits of measurement of the sound pressure level in front of the façade are investigated. Different placements of the external source and receiver are considered. Moreover, different placements of the receiver inside small rooms are compared by focusing on corner vs. center room positions. The uncertainties of room averaged sound pressure levels measured according to different standards are discussed. The problems of measurement of the reverberation time in small rooms and of sound insulation in irregular shaped rooms are introduced because these measurements present several critical challenges. Finally, suggestions to improve the future version of the ISO 140-5 are reported.
      Content Type Journal Article
      Category Research Article
      Pages 55-68

      DOI 10.1260/1475-4738.12.2.55

      Authors
      Umberto Berardi, Politecnico di Bari, via Orabona 4, Bari, I-70125, Italy
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 12
      Journal Issue Volume 12, Number 2 / June 2013
      PubDate: Fri, 12 Jul 2013 15:35:52 GMT
       
  • From the Ministries
    • Abstract: From the Ministries
      Content Type Journal Article
      Category Research Article
      Pages 69-72

      DOI 10.1260/1475-4738.12.2.69
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 12
      Journal Issue Volume 12, Number 2 / June 2013
      PubDate: Fri, 12 Jul 2013 15:35:52 GMT
       
  • Ground vibration induced by high-speed trains on bridge structures
    • Abstract: Ground vibration induced by high-speed trains can reach levels that cause annoyance to humans and interruption of sensitive instrumentation. To address this issue, the characteristics of ground vibration induced by Taiwan high-speed rail on bridge structures are evaluated using a wide range of field-measured data. The measurements for analysis consist of various foundation types, geological conditions, and train speeds. Both near-field vibration (25 m from track center) and far-field vibration propagation are evaluated. Specific influence factors for ground vibration assessment are also presented.
      Content Type Journal Article
      Category Research Article
      Pages 3-14

      DOI 10.1260/1475-4738.12.2.3

      Authors
      Yit-Jin Chen, Department of Civil Engineering, Chung Yuan Christian University, Chung-Li 32023, Taiwan
      Ting-Jui Chiu, Department of Civil Engineering, Chung Yuan Christian University, Chung-Li 32023, Taiwan
      Kuo-Yen Chen, Department of Civil Engineering, Chung Yuan Christian University, Chung-Li 32023, Taiwan
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 12
      Journal Issue Volume 12, Number 2 / June 2013
      PubDate: Fri, 12 Jul 2013 15:35:52 GMT
       
  • Helping sufferers to cope with noise using distance learning cognitive
           behaviour therapy
    • Abstract: Unresolved noise complaints cause considerable distress to sufferers, and a deterioration in quality of life as a consequence of failure to cope with the noise stress. The environmental noise control structure is directed towards higher frequency noises, which can be assessed by use of A-weighted measurements and this results in some low frequency noise problems receiving an inadequate evaluation. A number of countries now have limits for low frequency noise, but these are not yet well known or widely used. (Leventhall, 2009). Is there a solution to the problem of what can be done to help the small number of people who are adversely affected by perception of a low frequency noise, which it has not been possible to control? This paper describes how Cognitive Behaviour Therapy can be a solution.
      Content Type Journal Article
      Category Research Article
      Pages 15-26

      DOI 10.1260/1475-4738.12.2.15

      Authors
      Geoff Leventhall, Noise and Vibration Consultant
      Donald Robertson, CBT Practitioner
      Steve Benton, Westminster University
      Lyn Leventhall, E-Learning Consultant
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 12
      Journal Issue Volume 12, Number 2 / June 2013
      PubDate: Fri, 12 Jul 2013 15:35:51 GMT
       
  • Noise characteristics of twin-square slot jets
    • Abstract: Acoustic measurements have been undertaken on two different twin square jet topologies. OASPL, spectra, directivity measurement and shock-cell visualization have been conducted to evaluate twin square jets in different edge-vertex orientations. The results indicate that twin square jets effectively suppress noise up to 4 dB in terms of OASPL and 6 dB in terms of screech tonal SPL compared to an equivalent single circular jet. The study promises that twin-jet topology could serve as an effective tool for noise suppression.
      Content Type Journal Article
      Category Research Article
      Pages 47-64

      DOI 10.1260/1475-4738.12.1.47

      Authors
      V. Boopathi Sabareesh, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai - 600036, India
      K. Srinivasan, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai - 600036, India
      T. Sundararajan, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai - 600036, India
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 12
      Journal Issue Volume 12, Number 1 / March 2013
      PubDate: Tue, 14 May 2013 15:35:43 GMT
       
  • From the Ministries
    • Abstract: From the Ministries
      Content Type Journal Article
      Category Research Article
      Pages 65-68

      DOI 10.1260/1475-4738.12.1.65
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 12
      Journal Issue Volume 12, Number 1 / March 2013
      PubDate: Tue, 14 May 2013 15:35:43 GMT
       
  • A Consolidated Theory for Predicting Rain Noise
    • Abstract: This paper presents a theory for rain noise prediction, consolidating discussions of drop impact on a plate and resulting work on rain noise predictions that is found in the literature. An objective of the consolidated theory is a robust engineering model which does not rely on complex computational techniques or lengthy computer simulation. The model described is compared to measured data to establish accuracy and reliability.
      Content Type Journal Article
      Category Research Article
      Pages 3-26

      DOI 10.1260/1475-4738.12.1.3

      Authors
      Daniel Griffin, Marshall Day Acoustics, PO Box 5811 Wellesley Street, Auckland 1141, New Zealand
      Keith Ballagh, Marshall Day Acoustics, PO Box 5811 Wellesley Street, Auckland 1141, New Zealand
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 12
      Journal Issue Volume 12, Number 1 / March 2013
      PubDate: Tue, 14 May 2013 15:35:42 GMT
       
  • Comprehensive measurement in whole-body vibration
    • Abstract: Accurate measurements of human response to whole-body vibration are essential to any conclusions about the health risks, discomfort, and assessment of suspension systems in vibration environments. While accelerometers are traditionally considered the main measurement tools in whole-body vibration studies, their measurements become questionable when they are attached to inclined surfaces or when the motion has coupled components in multiple directions. Current measurement correction methodologies are subjective and limited to simple cases. A comprehensive correction methodology using inertial sensors was used in this work to quantify human response under single fore-aft, single-vertical, and multiple-axis whole-body vibration of twelve seated subjects with supported-backrest and unsupported-backrest upright posture. Vibration files of white noise random signals with frequency content of 0.5-12 Hz and vibration magnitude of 1.8 m/s2 RMS were used in the testing. The results have shown considerable differences in the transmissibility measurements without proper correction. The work presented has the potential to standardize experimentation in whole-body vibration and make measurements more accurate and defined across labs.
      Content Type Journal Article
      Category Research Article
      Pages 27-38

      DOI 10.1260/1475-4738.12.1.27

      Authors
      Jonathan DeShaw, Department of Civil and Environmental Engineering, College of Engineering, The University of Iowa, Iowa City, IA 52242, USA
      Salam Rahmatalla, Department of Civil and Environmental Engineering, College of Engineering, The University of Iowa, Iowa City, IA 52242, USA
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 12
      Journal Issue Volume 12, Number 1 / March 2013
      PubDate: Tue, 14 May 2013 15:35:42 GMT
       
  • Environmental noise impact on school students' academic achievements
    • Abstract: The aim of this paper is to investigate the relationships between environmental noise levels of schools and a set of academic achievement factors and also, to determine the noise exposure of schools. Secondary schools in Greater London were studied. Four academic achievement indicators were considered and five noise indicators were obtained after processing noise map data. The results show that in the studied schools, the environmental noise levels have almost no significant relationships with those academic achievement indicators. As expected, the secondary schools in Inner London are noisier than those in Outer London, with an average difference of 2dBA.
      Content Type Journal Article
      Category Research Article
      Pages 39-46

      DOI 10.1260/1475-4738.12.1.39

      Authors
      Hui Xie, School of Architecture, University of Sheffield, Western Bank, Sheffield, S10 2TN, United Kingdom
      Jian Kang, School of Architecture, University of Sheffield, Western Bank, Sheffield, S10 2TN, United Kingdom
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 12
      Journal Issue Volume 12, Number 1 / March 2013
      PubDate: Tue, 14 May 2013 15:35:42 GMT
       
  • Microphone array wind tunnel measurements of Reynolds number effects in
           high-speed train aeroacoustics
    • Abstract: The present study focuses on the Reynolds number dependence of high-speed train aeroacoustic sound sources. To cover a wide range of Reynolds numbers the experimental investigations are carried out on a 1: 25 scale-model of the high-speed train Inter City Express 3 by conducting microphone array measurements in two wind tunnels. The latter are the Aeroacoustic Wind tunnel (AWB) of the German Aerospace Center (DLR) in Brunswick, providing nearly perfect acoustical conditions, and the Cryogenic wind tunnel (DNW-KKK) of the DNW (German - Dutch wind tunnels) in Cologne, allowing measurements at higher Reynolds numbers. Two types of sound sources with different characteristics at Reynolds numbers of up to Re = 0.46 × 106 have been identified by measurements in the AWB. It was found, that the aeroacoustic noise from the bogie section is dominant for frequencies f < 5 kHz and can be characterised by cavity mode excitation. Further, the pantograph is the dominant sound source above f = 5 kHz with an Aeolian tone characteristic. Additional aeroacoustic measurements have been conducted in the cryogenic wind tunnel DNW-KKK in order to analyse the Reynolds number dependence of the noise generated at the first bogie, for higher Reynolds numbers of up to Re = 3.70 × 106. The DNW-KKK admits varying the Mach and Reynolds numbers independently. These measurements reveal only a weak Reynolds number dependence of the noise source generated at the first bogie.
      Content Type Journal Article
      Category Research Article
      Pages 35-62

      DOI 10.1260/1475-4738.11.4.35

      Authors
      Andreas Lauterbach, German Aerospace Center (DLR), Institute of Aerodynamics and Flow Technology Bunsenstrasse, 10, 37073 Göttingen, Germany
      Klaus Ehrenfried, German Aerospace Center (DLR), Institute of Aerodynamics and Flow Technology Bunsenstrasse, 10, 37073 Göttingen, Germany
      Sigfried Loose, German Aerospace Center (DLR), Institute of Aerodynamics and Flow Technology Bunsenstrasse, 10, 37073 Göttingen, Germany
      Claus Wagner, German Aerospace Center (DLR), Institute of Aerodynamics and Flow Technology Bunsenstrasse, 10, 37073 Göttingen, Germany
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 11
      Journal Issue Volume 11, Number 4 / December 2012
      PubDate: Tue, 19 Mar 2013 18:36:13 GMT
       
  • Questionnaire about Low Frequency Noise measurements in rooms
    • Abstract: Room modes at low frequencies generate large sound pressure level differences within enclosures. The resulting sound field is complicated and the sound pressure level measurements become very uncertain. Consequently, the measurements of environmental noise in dwellings, of occupational noise exposure, and of sound insulation of façades, are not accurate at low frequencies. A special measurement methodology exists in a few countries. Measurement methods aim to be accurate and reliable, but they can not determine, at the same time, both the existing and the experienced sound field. A questionnaire was created to gather opinions on how measurements should be performed from several experts with experience in low frequency noise measurements in rooms. Twenty-three experts took part in this survey. The results from the questionnaire are presented in this paper. Most participants considered it necessary to standardize a reliable measurement method, but there was no unanimity about what the method should be. The most controversial points of discussion were the locations where the measurements should be taken, and how the measured data should be analyzed. A brief discussion of these points is presented.
      Content Type Journal Article
      Category Research Article
      Pages 3-12

      DOI 10.1260/1475-4738.11.4.3

      Authors
      David Oliva, Finnish Institute of Occupational Health, Lemminkäisenkatu 14-18B, 20520, Turku, Finland
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 11
      Journal Issue Volume 11, Number 4 / December 2012
      PubDate: Tue, 19 Mar 2013 18:36:13 GMT
       
  • Airport noise insulation programs: The Spanish case
    • Abstract: Noise pollution around airports is one of the most important problems in environmental acoustics. The incessant development of modern societies is continuously increasing the demand for air transport, and airports have to grow to adapt their operational capacity to the new requirements. On the other hand, the economic activity related to airports is closely linked to the expansion of built-up areas around them. Consequently, two completely incompatible land uses are forced to coexist, causing airport capacity to remain limited while the inhabitants do not cease to be annoyed by aircraft noise. Although there are several international initiatives setting the focus on the reduction of noise at the source, people living in residential areas around airports need urgent solutions. Among others, the implementation of sound insulation programs is one of the most widely-adopted solutions worldwide, as it allows a reduction of sound levels in the interior of dwellings, while the operational capacity of the airport remains unaffected. The definition and application of a sound insulation program is a very complex process that needs to manage several opposing factors: health, annoyance, airport capacity, economic costs of insulation measures … In this paper we describe the case of Spanish airport insulation programs. We set the focus on a concise description of the full process, from the creation of noise maps, to the checking of installed soundproofing measures, as carried out by the Spanish administration. As a result of this process, thousands of dwellings and houses have been acoustically insulated to meet indoor noise comfort criteria in Madrid, Mallorca and Malaga airports, among others.
      Content Type Journal Article
      Category Research Article
      Pages 25-34

      DOI 10.1260/1475-4738.11.4.25

      Authors
      C. Asensio, Universidad Politécnica de Madrid (CAEND), c/ Serrano, 144 - 28006 Madrid - Spain
      I. Pavón, Universidad Politécnica de Madrid (CAEND), c/ Serrano, 144 - 28006 Madrid - Spain
      M. Recuero, Universidad Politécnica de Madrid (CAEND), c/ Serrano, 144 - 28006 Madrid - Spain
      M. Ausejo, Universidad Politécnica de Madrid (CAEND), c/ Serrano, 144 - 28006 Madrid - Spain
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 11
      Journal Issue Volume 11, Number 4 / December 2012
      PubDate: Tue, 19 Mar 2013 18:36:13 GMT
       
  • Sound Pressure Levels in Rooms: A Study of Steady State Intensity, Total
           Sound Level, Reverberation Distance, a New Discussion of Steady State
           Intensity and Other Experimental Formulae
    • Abstract: In this publication we include all, or almost all, the valid formulas of sound levels in different types of rooms. We will explain all the theoretical basis of each of them, starting with reflected intensity, both classical and revised theories, the total sound level and its uses in concert venues. We will also deal with empirical formulas mainly for classrooms, churches and religious buildings and industrial use. However, the main significance of this work is not only the wide range of formulas exposed but also that we have found the explanation of why the reverberation radius, or distance radius, cannot exist in the revised theory. This finding can help that the revised theory of M. Barron be slightly modified to apply it to any room for several uses, other than concerts
      Content Type Journal Article
      Category Research Article
      Pages 13-24

      DOI 10.1260/1475-4738.11.4.13

      Authors
      Higini Arau-Puchades, Arauacustica, C/Travessera de Dalt 118, 08024 Barcelona, Spain
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 11
      Journal Issue Volume 11, Number 4 / December 2012
      PubDate: Tue, 19 Mar 2013 18:36:13 GMT
       
  • From the Ministries
    • Abstract: From the Ministries
      Content Type Journal Article
      Category Research Article
      Pages 63-68

      DOI 10.1260/1475-4738.11.4.63
      Journal Noise Notes
      Print ISSN 1475-4738
      Journal Volume Volume 11
      Journal Issue Volume 11, Number 4 / December 2012
      PubDate: Tue, 19 Mar 2013 18:36:13 GMT
       
  • From the Ministries
    • Abstract: From the Ministries
      Content Type Journal Article
      Category Research Article
      Pages 71-74

      DOI 10.1260/1475-4738.11.1.71
      Journal Noise Notes

      Print
      ISSN 1475-4738
      Journal Volume Volume 11
      Journal Issue Volume 11, Number 1 / April 2012
      PubDate: Thu, 24 May 2012 20:33:00 GMT
       
  • Train Passengers Comfort with regard to Whole-Body Vibration
    • Abstract: A case study was conducted to evaluate passengers' comfort on the Tehran-Andimeshk train in Iran. Hence, based on a=0.05, 91 passengers were selected. Whole-body vibration transmitted to the passengers was measured according to ISO 2631-1-1997. The crest factors in the the majority of wagons were below the 19 dB according to ISO 2631-1-1997 hence, the equal acceleration levels of the wagons were taken into consideration. The statistical relationships between 15 psychological and physiological disorders with age, gender, number of the trips and Aeq (equivalent acceleration level) were studied based on the questionnaires. The results revealed no statistical relationships between the health symptoms and age. Conversely, there was a significant statistical relationship between fatigue and gender. Also, sleeplessness and hearing disorders bother the passengers during the trips based on statistical analysis. Moreover, there were statistical relationships between studying with headache and nausea with eating. In addition, despite all 15 symptoms bothering the passengers during the trips, there was only a significant statistical relationship between Aeq (equivalent acceleration level) and anger. Hence, more factors must be taken into consideration to find the other reasons of passengers discomfort during the trips.
      Content Type Journal Article
      Category Research Article
      Pages 49-60

      DOI 10.1260/1475-4738.11.1.49

      Authors
      P. Nassiri, Department of Occupational Health, The School of Public Health, Tehran University of Medical Sciences, P.O Box 6446-14155, Tehran, Iran
      A. R. Koohpaei, Department of Occupational Health, The School of Public Health, Tehran University of Medical Sciences, P.O Box 6446-14155, Tehran, Iran
      H. Zeraati, Department of Epidemiology and Biostatistics, The School of Public Health, Tehran University of Medical Sciences, Iran
      P. Jafari Shalkouhi, Department of Environmental Engineering, Graduate School of the Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran
      Journal Noise Notes

      Print
      ISSN 1475-4738
      Journal Volume Volume 11
      Journal Issue Volume 11, Number 1 / April 2012
      PubDate: Thu, 24 May 2012 20:33:00 GMT
       
  • Quantifying whole body vibration exposures in metropolitan bus drivers: an
           evaluation of three seats
    • Abstract: The objective of this study was to evaluate three seats amongst a population of metropolitan bus drivers as they drove a standardized test route including city streets, old and new freeways, and a street segment containing ten large speed humps. Three comparisons were made: 1) comparing seats made by different manufactures (Seat 1 and Seat 2), 2) comparing seats with a standard foam (Seat 2) and silicone foam (Seat 3) seat pans, and 3) comparing WBV exposures based on road types. Whole body vibration (WBV) exposures were measured using a tri-axial seat pan accelerometer and the attenuation capabilities of each seat were evaluated by comparing the vibrations measured at the floor and seat of the bus. There were significant WBV exposure differences between the various street types, which were shown across all seat types. The city street and older freeway segments had the highest WBV exposures with both segments producing WBV exposures slightly above the action limit for Vibration Dose Value (VDV(8)). Relative to Seat 2, Seat 1 performed better at attenuating impulsive and shock related WBV exposures, however, neither seat performed significantly better when Average Vibration (Aw(8)) and VDV(8) WBV exposures were compared. In addition, no performance differences were seen between the standard foam (Seat 2) and silicone foam (Seat 3) seat pans. This study provided a unique opportunity to explore WBV exposures among bus drivers and potential ergonomic interventions in the way of seat options to reduce WBV exposures and potentially reduce workplace injuries.
      Content Type Journal Article
      Category Research Article
      Pages 61-70

      DOI 10.1260/1475-4738.11.1.61

      Authors
      Ryan P. Blood, School of Public Health, Department of Environmental and Occupational Health Sciences, Ergonomics Research Laboratory, University of Washington, Seattle, WA 98105, USA
      Peter W. Johnson, School of Public Health, Department of Environmental and Occupational Health Sciences, Ergonomics Research Laboratory, University of Washington, Seattle, WA 98105, USA
      Journal Noise Notes

      Print
      ISSN 1475-4738
      Journal Volume Volume 11
      Journal Issue Volume 11, Number 1 / April 2012
      PubDate: Thu, 24 May 2012 20:33:00 GMT
       
  • Acoustics for Symphony Orchestras; Status After Three Decades of
           Experimental Research
    • Abstract: In 1978, one particular paper in JASA by Harold Marshall, D. Gottlob and H. Alrutz titled: "Acoustical conditions preferred for ensemble" inspired the author and other researchers to investigate the acoustic conditions experienced by musicians on concert hall stages. The research carried out since then has involved subjective assessment by musicians playing in simulated sound fields as well as in real halls; but also purely objective investigations have been reported. After one third of a century, it seems appropriate to summarize what we have learned and where we still need more knowledge. The paper will summarize major contributions to the field, discuss the differences in opinion in view of the limitations associated with different experimental approaches, and finally address the challenges related to meeting working environment requirements recently enforced by law in Europe for limiting the sound exposure levels of musicians.
      Content Type Journal Article
      Category Research Article
      Pages 3-26

      DOI 10.1260/1475-4738.11.1.3

      Authors
      Anders Christian Gade, Gade & Mortensen Akustik A/S, Copenhagen, Denmark
      Journal Noise Notes

      Print
      ISSN 1475-4738
      Journal Volume Volume 11
      Journal Issue Volume 11, Number 1 / April 2012
      PubDate: Thu, 24 May 2012 20:32:59 GMT
       
  • Evolution from ‘tabs’ to ‘chevron technology’ - a
           review
    • Abstract: ‘Chevrons’, a sawtooth pattern on the trailing edge of exhaust nozzles, are being implemented on modern jet engines. The technology reduces jet noise for ‘separate-flow’ nozzles used on newer jet aircraft engines. The purpose of this paper is to describe the development of this technology, starting with studies of ‘tabs’ in the 1980's and 1990's. The tabs, essentially chevrons with more aggressive penetration, were studied in those early years with a focus on mixing enhancement in jets. Observations from experimentalists in connection with mixing enhancement and plume signature reduction suggested that there might also be a noise benefit. In the mid-nineties, these devices, with mild penetration to minimize thrust loss, were first seriously explored for aircraft engine noise reduction purposes. Prompted by a strong need for jet noise reduction, the study became a joint NASA/industry effort that ultimately matured the chevron technology to production by mid-2000's. The process is an example of how fundamental studies over decades eventually migrate to application but often take a concerted effort.
      Content Type Journal Article
      Category Research Article
      Pages 27-48

      DOI 10.1260/1475-4738.11.1.27

      Authors
      K. B. M. Q. Zaman, NASA Glenn Research Center, Cleveland, OH 44135, USA
      J. E. Bridges, NASA Glenn Research Center, Cleveland, OH 44135, USA
      D. L. Huff, NASA Glenn Research Center, Cleveland, OH 44135, USA
      Journal Noise Notes

      Print
      ISSN 1475-4738
      Journal Volume Volume 11
      Journal Issue Volume 11, Number 1 / April 2012
      PubDate: Thu, 24 May 2012 20:32:59 GMT
       
 
 
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