R. E. Halliwell

National Research Council Canada

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Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

J. D. Quirt

National Research Council Canada

T.R.T. Nightingale

National Research Council Canada

A. C. C. Warnock

National Research Council Canada

J. S. Bradley

University of York

John S. Bradley

Rady Children's Hospital-San Diego

R. R. Parsons

H3D (United States)

J.A. Birta

National Research Council Canada

Trevor Nightingale

National Research Council Canada

Mohamed A. Sultan

National Research Council Canada

T. D. Northwood

National Research Council Canada

Cooperative Institutions

National Research Council Canada

National Academies of Sciences, Engineering, and Medicine

Queen's University

Western University

University of British Columbia

Institute for Microstructural Sciences

University of Toronto

University of York

Higher Institute of Engineering

Cairo University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Ten years of newer auditorium acoustics measurements

The Journal of the Acoustical Society of America (1991)

J. S. Bradley R. E. Halliwell

This paper reviews progress in making newer types of auditorium acoustics measurements over the past 10 years. All of the newer measures require impulse responses to be obtained and the merits and limitations of various measurement approaches will be discussed including the type of source, receiver, and processing that is used. Objective descriptions and the subjective relevance of the various types of newer measures will be reviewed including both monaural and binaural quantities. Four generations of measurement systems will be described including the special problems associated with measuring inter-aural cross correlation coefficients. Finally the questions of accuracy and repeatability will be mentioned along with some discussion of future developments and problems to be solved.

Monaural

Repeatability

Impulse response

Relevance

10.1121/1.2029261

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Citations (3)

Absorption corrections for transmission loss measurements

The Journal of the Acoustical Society of America (1986)

A. C. C. Warnock R. E. Halliwell

Measurements of sound transmission loss made using nine different methods to estimate the effects of room absorption are reported. A single wall specimen was used in five different positions in the opening of a laboratory sound transmission loss test suite. Four different levels of room absorption were used. The conventional decay method is shown to work well in all cases, as does a method using a sound source with a known power to estimate the room absorption. A method using a sound-pressure level near the source and the room average, the near–far method, did not work as well.

Sound transmission class

Transmission loss

10.1121/1.394165

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Citations (0)

An acoustical round robin with a difference

The Journal of the Acoustical Society of America (1982)

R. E. Halliwell

Traditionally, an acoustical absorption round robin requires that a number of laboratories perform similar measurements on the same or nominally the same material and report the results to a coordinating body. Recently the Division of Building Research of the National Research Council Canada completed a different type of round robin, with absorption measurments being made on the same sample, using the same equipment, and performed by the same operators at a number of acoustical laboratories in Canada and the United States. This makes it possible to reduce the variability associated with different measurement procedures so that the variability due to room and diffuser geometry can be studied.

Diffuser (optics)

Sample (material)

Round robin test

Research council

10.1121/1.2019371

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Citations (0)

Photoluminescent studies of the condensed phase in phosphorus-doped silicon

Solid State Communications (1973)

R. E. Halliwell R. R. Parsons

10.1016/0038-1098(73)90573-5

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Citations (17)

Residential Planning with Respect to Road and Rail Noise

Noise Control Engineering (1979)

T. D. Northwood J. D. Quirt R. E. Halliwell

describe a procedure for providing adequate protection to housing from the noises of road and rail traffic.The method involves the establishment of criteria of acceptable noise, inside a building and in a sheltered outdoor space; prediction of the noise level at a proposed site, considering traffic flow parameters, barriers, topographical effects, and ground attenuation; and the design of a building to meet the noise criteria.77In planning residential development, one factor to consider is the potential exposure to high levels of noise from nearby roads or railways.This is an important concern to the eventual residents, and to the builders and regulatory agencies as well.One such agency is Central Mortgage and Housing Corporation, a Canadian government agency for funding housing construction.This article describes a guideline prepared

Roadway noise

10.3397/1.2832128

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Citations (2)

Bending and Tension Tests on Annealed and Cold-rolled Steel Sheet

George Gordon R. E. Halliwell J.L. Duncan

A sample of 0.8mm cold rolled, fully killed sheet was received from New Zealand Steel Ltd. in the as-annealed and in the temper rolled condition; these were tested in bending and in the tensile test. The as-annealed sheet had a yield point elongation of 5.5% and in bending an upper yield stress of 410 MPa. Temper rolling completely removed the effects of ageing and the yield stress in bending was reduced to 190 MPa. Cold rolling of the as-annealed sheet in the laboratory mill at the University of Auckland showed that for reductions with equivalent strain less than the yield point elongation of the as-annealed sheet, yield phenomena were not eliminated and the upper yield stress in bending remained high resulting in kinking in the bend test. It is not clear why thickness reductions in the laboratory mill that are large enough to be measured with certainty do not produce sufficient mobile dislocations in the sheet to remove yield effects. These results suggest that further studies should be performed on as-annealed and temper rolled sheet as well as sheet from the galvanizing line in order to provide more information on the effects of small plastic deformations on the mechanical behaviour of aged sheet and the elimination of yield point phenomena.

Elongation

Tension (geology)

Tensile testing

Source

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Citations (0)

Assessing electroacoustic systems with auditorium acoustics measures

The Journal of the Acoustical Society of America (1989)

J. S. Bradley R. E. Halliwell

Modern auditorium acoustics measures have been successfully used to objectively assess changes to auditoria. This paper reports the use of the same techniques to assess the acoustical changes introduced in halls by three types of electroacoustic systems. These were: a film sound system and two different room acoustics modification systems. The RAMSoft room acoustics measurement program was used with broadband exponential pulses as the source signal. The program calculates 12 different quantities in each of six octave bands and permits an evaluation in terms of the needs for both speech and music. While one of the room modification systems was not found to be very effective, the other produced considerable increases in reverberation along with some related effects. Repositioning of the film sound system loudspeakers was shown to improve the performance of the system. The results clearly demonstrate the value of objective evaluations of electroacoustic systems in rooms.

Room acoustics

Architectural acoustics

Sound reinforcement system

Electroacoustic music

10.1121/1.2026841

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Citations (0)

Sound transmission through gypsum board walls - Effect of shear membranes and framing details

Canadian acoustics (2001)

T.R.T. Nightingale R. E. Halliwell J. D. Quirt

An overview is given on trends observed in the sound transmission results from a research project that studied both sound and fire resistance of wall assemblies intended for multi-family residential buildings. Focus is on factors controlling airborne transmission and structure-related aspects.

Framing (construction)

Sound transmission class

Source

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Citations (0)

Fuzzwall: Blocking sound transmission above suspended ceilings

The Journal of the Acoustical Society of America (1988)

J. D. Quirt R. E. Halliwell

Interoffice partitions commonly stop at the suspended ceiling. The plenum space above the ceiling is used as an air-return for the ventilation system. Sound transmission through this space often limits interoffice speech privacy. This paper reports the performance of a barrier system intended to reduce sound transmission without preventing airflow. Fibrous absorptive material has been used as a barrier system. Dependence of the noise reduction on physical parameters (flow resistance, barrier thickness, density, etc.) and the effect of providing for airflow have been examined. Laboratory results and preliminary field test data will be presented.

Ceiling (cloud)

Plenum space

Sound transmission class

Soundproofing

Flow resistance

10.1121/1.2025436

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Citations (0)

The phase transitions near the melting point of sbCL3

Journal of Magnetic Resonance (1969) (1975)

R. J. C. Brown G.C Gillies R. E. Halliwell S. L. Segel

Laser linewidth

Endotherm

Differential thermal analysis

10.1016/0022-2364(75)90251-6

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Citations (1)