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  • 1
    Language: English
    In: The Journal of the Acoustical Society of America, 05/2017, Vol.141(5), pp.3928-3928
    Description: The ASTM standard E90 defines the measurement of transmission loss, equivalent to the sound reduction index defined in ISO 10140. ASTM E90 and ISO 10140 specify requirements for the laboratory, the test procedure and conditions, and for preparation and mounting of the specimen under test. Despite the strict requirements in ISO 10140 and the somewhat less strict requirements in ASTM E90, transmission loss results for nominally identical specimens often vary if measured in different laboratories, and sometimes even if measured again in the same laboratory. In practice, there are many factors that affect the repeatability or reproducibility of a transmission loss test for a given specimen. This presentation will not attempt to systematically cover all different sources of uncertainty, but instead will highlight some practical issues commonly encountered in laboratory transmission loss tests. Examples will be presented for a number of issues, including the effect of leakage through the specimen under test, the effect of varying temperature and humidity in the test chambers, and the effect of re-using gypsum board.
    Keywords: 3rd Joint Meeting Of The Acoustical Society Of America And The European Acoustics Association;
    ISSN: 0001-4966
    Source: CrossRef
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  • 2
    Language: English
    In: The Journal of the Acoustical Society of America, 09/2015, Vol.138(3), pp.1758-1758
    Description: The proposed 2015 edition of the National Building Code of Canada sees a major change in sound insulation requirements. Instead of prescribing requirements for the separating assembly only (in terms of STC values), the Code now sets requirements for the sound insulation performance of the complete system (in terms of Apparent Sound Transmission Class (ASTC) values), including flanking sound transmission. The National Research Council Canada is actively supporting the change in the Code by conducting various projects with industry associations from different construction sectors, in order to provide tools, guidance, and the necessary data for compliance. This presentation focuses on a joint project between the National Research Council Canada and the Canadian Concrete Masonry Producers Association. In the project, the direct and flanking sound transmission in concrete masonry and hybrid building systems were investigated. For masonry walls in combination with concrete floors, the ASTC values were calculated according to ISO 15712-1. For masonry walls in combination with wood joist floors, the ASTC values were measured according to ISO 10848. Furthermore, the effect of linings on concrete masonry walls was investigated. This presentation will provide an overview of each of these issues, including results and recommendations.
    Keywords: Program Abstracts Of The 170th Meeting Of The Acoustical Society Of America;
    ISSN: 0001-4966
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  • 3
    Language: English
    In: The Journal of the Acoustical Society of America, 05/2017, Vol.141(5), pp.3479-3479
    Description: With the 2015 National Building Code now in effect in Canada, predicting the apparent sound insulation in buildings from laboratory measurements is becoming increasingly relevant for architects and designers. In North America, the apparent sound insulation is classified in terms of Apparent Sound Transmission Class (ASTC). The ASTC rating includes both the transmission through the separating assembly and the transmission via flanking paths. The National Research Council Canada has published a number of guideline documents that detail the calculation procedure for ASTC and provide the required laboratory data for various construction types. In NRC Research Report RR-335, “Apparent Sound Insulation in Cross-Laminated Timber Buildings” the focus is on buildings which are constructed from cross-laminated timber (CLT) panels. Measurements of the direct sound insulation of CLT panels and the vibration attenuation at their junctions were conducted at the NRC in recent years. The report RR-335 describes how to combine the relevant data to obtain estimates of the apparent transmission loss and the ASTC rating for a given CLT construction. This presentation will present highlights of the report and demonstrate the use of the Simplified Method and the Detailed Method to calculate the ASTC rating.
    Keywords: 3rd Joint Meeting Of The Acoustical Society Of America And The European Acoustics Association;
    ISSN: 0001-4966
    E-ISSN: 15208524
    Source: CrossRef
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  • 4
    Language: English
    In: The Journal of the Acoustical Society of America, 09/2015, Vol.138(3), pp.1757-1757
    Description: The proposed 2015 edition of the National Building Code of Canada sees a major change in sound insulation requirements. Instead of prescribing requirements for the separating assembly only (in terms of STC values), the Code now sets requirements for the sound insulation performance of the complete system (in terms of Apparent Sound Transmission Class (ASTC) values), including flanking sound transmission. The National Research Council Canada is actively supporting the change in the Code by conducting various projects with industry associations from different construction sectors, in order to provide tools, guidance, and the necessary data for compliance. This presentation provides an overview of the new requirements and of the different paths to compliance. Furthermore, various projects conducted at the National Research Council Canada to support the Code change are presented, including tools and guidance to help practitioners. Detailed descriptions of two of the projects are given in two complementary presentations.
    Keywords: Program Abstracts Of The 170th Meeting Of The Acoustical Society Of America;
    ISSN: 0001-4966
    Source: CrossRef
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  • 5
    Language: English
    In: The Journal of the Acoustical Society of America, 04/2016, Vol.139(4), pp.2013-2013
    Description: The 2015 edition of the National Building Code of Canada (NBCC) specifies sound insulation requirements between dwelling units in terms of Apparent Sound Transmission Class (ASTC). The ASTC includes both the direct sound transmission through the separating element between adjacent rooms as well as the sound transmission via flanking paths. One of the ways to establish compliance with the NBCC involves a calculation procedure based on ISO 15712-1, in which the flanking sound transmission is predicted from the measured sound transmission through individual building elements combined with the attenuation at their junction. The calculation can be performed in third-octave bands (“Detailed Method”) or using single-number ratings such as the STC (“Simplified Method”). This presentation will describe the two calculation procedures, before focusing on the differences between. In extended studies at the National Research Council Canada, it was found that the simplified method sometimes leads to misleading results. An alternative method for calculating the ASTC of walls with linings was proposed, which ensures that the simplified method yields more conservative results than the detailed method. To achieve the best possible estimate of the sound insulation performance of buildings systems with linings, the detailed method should be used.
    Keywords: Program Abstracts Of The 171st Meeting Of The Acoustical Society Of America;
    ISSN: 0001-4966
    Source: CrossRef
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  • 6
    Language: English
    In: The Journal of the Acoustical Society of America, 09/2018, Vol.144(3), pp.1813-1813
    Description: It has long been established that correlation-based measurement techniques, using, e.g., maximum length sequences and swept sines, outperform classical methods based on random Gaussian noise. Among the advantages of these modern techniques are better rejection of background noise and reduced measurement duration to achieve similar or better precision. These advantages are especially interesting in room and building acoustics, where many measurement positions typically have to be covered and background noise is often an issue, especially when measuring sound transmission loss or velocity level differences. Unfortunately, there is currently no provision in the ASTM standards on room and building acoustics that would allow the use of these modern measurement methods. To demonstrate the advantages of these methods, this contribution will present an example of measurements of the apparent sound transmission loss, i.e., measurements of sound pressure level differences and reverberation times. In addition to the standardized measurements according to ASTM E336, all measurements were repeated with maximum length sequences and swept sines. The results will be compared and the advantages of the modern techniques will be highlighted.
    Keywords: 176th Meeting Of The Acoustical Society Of America, 2018 Acoustics Week In Canada;
    ISSN: 0001-4966
    Source: CrossRef
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  • 7
    Language: English
    In: Cancer Research, 04/15/2010, Vol.70(8 Supplement), pp.3615-3615
    ISSN: 0008-5472
    E-ISSN: 1538-7445
    Source: CrossRef
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  • 8
    Language: English
    In: The Journal of the Acoustical Society of America, 09/2018, Vol.144(3), pp.1802-1802
    Description: The communication performance of three general service respirators was evaluated. The evaluation procedure followed a NIOSH standard test procedure which is based on a modified rhyme test (MRT), wherein human participants are placed in a controlled acoustic environment and are asked to read out lists of test words. The number of words correctly identified by a listener panel when the talker is wearing the respirator is compared to the number of words correctly identified without the respirator, giving an overall performance rating. During the implementation of the experimental procedure, it was noted that the NIOSH test procedure is ambiguous on a number of potentially significant acoustical issues, e.g., the reverberation time of the test environment, the background noise spectrum at the listener position, and the talker voice level. This talk will present details of the study and discuss the relevant issues related to speech intelligibility testing of respirators that were evaluated as part of this project.
    Keywords: 176th Meeting Of The Acoustical Society Of America, 2018 Acoustics Week In Canada;
    ISSN: 0001-4966
    Source: CrossRef
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  • 9
    Language: English
    In: PLoS ONE, Nov 12, 2014, Vol.9(11)
    Description: Background Recent genome-wide association studies revealed the rs12979860 single nucleotide polymorphism (SNP) of the IL28B gene (CC genotype) to be the strongest pre-therapeutic predictor of therapy response to interferon alpha in patients with chronic hepatitis C infection. The favorable CC genotype is associated with significantly higher rates of sustained virologic response. No data exist on the role of IL28B polymorphism in interferon therapy of diseases other than viral hepatitis. Methods A retrospective study involving 106 patients with melanoma who received low- or high-dose interferon therapy was performed. The CC and non-CC genotype of IL28B rs12979860 SNP were correlated with progression-free and overall survival. Results 44 (41.5%) patients were CC and 62 (58.5%) non-CC. There was no statistically significant difference in age at diagnosis, melanoma type or localization, Breslow level or AJCC stage between CC and non-CC patients. During the observation period (6.43#177;4.66 years) disease progression occurred in 36 (34%) patients after 5.5#177;4.3 years. 43.2% (19) of patients with CC and 27.4% (17) of patients with non-CC genotype were affected (p = 0.091). Disease progression was more frequent in patients on high dose interferon therapy and with a worse AJCC stage. Conclusion In contrast to classical risk factors like tumor thickness and clinical stage, IL28B polymorphism was not associated with progression-free or overall survival in patients with melanoma treated with interferon alpha.
    Keywords: Genomics -- Health Aspects ; Biological Response Modifiers -- Health Aspects ; Interferon Alpha -- Health Aspects ; Single Nucleotide Polymorphisms -- Health Aspects ; Medical Research -- Health Aspects ; Hepatitis C -- Genetic Aspects ; Hepatitis C -- Drug Therapy ; Hepatitis C -- Development And Progression ; Hepatitis C -- Health Aspects ; Melanoma -- Genetic Aspects ; Melanoma -- Drug Therapy ; Melanoma -- Development And Progression ; Melanoma -- Health Aspects ; Biological Products Industry -- Health Aspects
    ISSN: 1932-6203
    Source: Cengage Learning, Inc.
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  • 10
    Language: English
    In: PLoS ONE, Nov 12, 2014, Vol.9(11)
    Description: Background Recent genome-wide association studies revealed the rs12979860 single nucleotide polymorphism (SNP) of the IL28B gene (CC genotype) to be the strongest pre-therapeutic predictor of therapy response to interferon alpha in patients with chronic hepatitis C infection. The favorable CC genotype is associated with significantly higher rates of sustained virologic response. No data exist on the role of IL28B polymorphism in interferon therapy of diseases other than viral hepatitis. Methods A retrospective study involving 106 patients with melanoma who received low- or high-dose interferon therapy was performed. The CC and non-CC genotype of IL28B rs12979860 SNP were correlated with progression-free and overall survival. Results 44 (41.5%) patients were CC and 62 (58.5%) non-CC. There was no statistically significant difference in age at diagnosis, melanoma type or localization, Breslow level or AJCC stage between CC and non-CC patients. During the observation period (6.43#177;4.66 years) disease progression occurred in 36 (34%) patients after 5.5#177;4.3 years. 43.2% (19) of patients with CC and 27.4% (17) of patients with non-CC genotype were affected (p = 0.091). Disease progression was more frequent in patients on high dose interferon therapy and with a worse AJCC stage. Conclusion In contrast to classical risk factors like tumor thickness and clinical stage, IL28B polymorphism was not associated with progression-free or overall survival in patients with melanoma treated with interferon alpha.
    Keywords: Genomics – Health Aspects ; Biological Response Modifiers – Health Aspects ; Interferon Alpha – Health Aspects ; Single Nucleotide Polymorphisms – Health Aspects ; Medical Research – Health Aspects ; Hepatitis C – Genetic Aspects ; Hepatitis C – Drug Therapy ; Hepatitis C – Development and Progression ; Hepatitis C – Health Aspects ; Melanoma – Genetic Aspects ; Melanoma – Drug Therapy ; Melanoma – Development and Progression ; Melanoma – Health Aspects ; Biological Products Industry – Health Aspects
    ISSN: 1932-6203
    Source: Cengage Learning, Inc.
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