1) The document discusses different methods for calculating reverberation time in rooms and auditoriums, including based on room dimensions, materials, and total sound absorption.
2) It provides formulas for calculating reverberation time based on room volume, total absorption, and other factors. The optimal reverberation time for an auditorium with 5000 cubic meters volume is given as 0.8 seconds.
3) Different types of sound absorbing materials are described, including porous materials like fiberboards and mineral wools, non-perforated panel absorbers, and cavity/Helmholtz resonators. Examples and properties of each type are outlined.
“a science that deals with the production, control, transmission, reception, and effects of sound.”
it is the science of controlling sound within buildings.
Notes for Architecture 4th Year subject Services. The topic is about Acoustic, how does it work for different places, how we can treat spaces according to acoustic and for better acoustic
The behavior of sound in enclosed spaces is an important matter particularly in homes. It explains how the sound we listen gets colored causing distortion.
“a science that deals with the production, control, transmission, reception, and effects of sound.”
it is the science of controlling sound within buildings.
Notes for Architecture 4th Year subject Services. The topic is about Acoustic, how does it work for different places, how we can treat spaces according to acoustic and for better acoustic
The behavior of sound in enclosed spaces is an important matter particularly in homes. It explains how the sound we listen gets colored causing distortion.
The property of surface by which sound energy (kinetic energy) is converted into other form of energy, generally heat energy (due to friction) and get absorbed.
There is no royal road for making a particular room acoustically good. It mainly depends on the ideas of the engineer or the Architect. Each case is to be studied separately and after proper thinking and calculations, suitable materials may be specified.
WHAT IS ACOUSTICS? what is sound? AMPLITUDE AND VOLUME, FREQUENCY AND PITCH
LOUDNESS OR INTENSITY
LOUDNESS OR INTENSITY
LOUDNESS OR INTENSITY, TIMBRE
VELOCITY OF SOUND
AMPLITUDE
REFLECTION
Explains basics about sound and what classroom issues are present due to sound effects which causes problem for students to hear teacher properly.
Explains concept of reverberation and other issues and suggests about its solution for better classroom sound efficiency
An acoustic case study that covers a research of the project of "The Solaris and Leisure Centre, Estonia ", documenting through writings, sketches, acoustical information and photos. This would help to understand the various aspects of designing and constructing an auditorium keeping the acoustics in mind.
The property of surface by which sound energy (kinetic energy) is converted into other form of energy, generally heat energy (due to friction) and get absorbed.
There is no royal road for making a particular room acoustically good. It mainly depends on the ideas of the engineer or the Architect. Each case is to be studied separately and after proper thinking and calculations, suitable materials may be specified.
WHAT IS ACOUSTICS? what is sound? AMPLITUDE AND VOLUME, FREQUENCY AND PITCH
LOUDNESS OR INTENSITY
LOUDNESS OR INTENSITY
LOUDNESS OR INTENSITY, TIMBRE
VELOCITY OF SOUND
AMPLITUDE
REFLECTION
Explains basics about sound and what classroom issues are present due to sound effects which causes problem for students to hear teacher properly.
Explains concept of reverberation and other issues and suggests about its solution for better classroom sound efficiency
An acoustic case study that covers a research of the project of "The Solaris and Leisure Centre, Estonia ", documenting through writings, sketches, acoustical information and photos. This would help to understand the various aspects of designing and constructing an auditorium keeping the acoustics in mind.
Factors affecting acoustics of buildings and their remedies.Burhanuddin Kapadia
Acoustics plays an important role in the sound ergonomics
due to which sound can be distributed equally to entire hall.
the following slide gives an overview of the factors of acoustics and its remedies.
The Function and Principle of Sound absorbing Materials.pdfSINOYQX
Sound-absorbing materials can make any material absorb sound, but the degree of absorption is very different. Most of them are loose and porous materials, such as slag wool, blankets, etc., and their sound absorption mechanism is that sound waves go deep into the pores of the material. And the pores are mostly open holes that communicate with each other internally, which are subjected to friction and viscous resistance of air molecules, as well as mechanical vibration of fine fibers, so that sound energy is converted into heat energy.
How to Add Chatter in the odoo 17 ERP ModuleCeline George
In Odoo, the chatter is like a chat tool that helps you work together on records. You can leave notes and track things, making it easier to talk with your team and partners. Inside chatter, all communication history, activity, and changes will be displayed.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
MATATAG CURRICULUM: ASSESSING THE READINESS OF ELEM. PUBLIC SCHOOL TEACHERS I...NelTorrente
In this research, it concludes that while the readiness of teachers in Caloocan City to implement the MATATAG Curriculum is generally positive, targeted efforts in professional development, resource distribution, support networks, and comprehensive preparation can address the existing gaps and ensure successful curriculum implementation.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Dr. Vinod Kumar Kanvaria
Exploiting Artificial Intelligence for Empowering Researchers and Faculty,
International FDP on Fundamentals of Research in Social Sciences
at Integral University, Lucknow, 06.06.2024
By Dr. Vinod Kumar Kanvaria
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Normal Labour/ Stages of Labour/ Mechanism of LabourWasim Ak
Normal labor is also termed spontaneous labor, defined as the natural physiological process through which the fetus, placenta, and membranes are expelled from the uterus through the birth canal at term (37 to 42 weeks
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
2. Calculate the reverberation time (at 500hz) in a room of Length
10m Breadth 6m and a height of 4m. The room has 2 openings
fixed with wooden doors of area 2.1 sqm each. The longer walls
contain 3 glass windows each of length 2m and width 1.5m. One of
the smaller walls is treated with acoustic tiles and the flooring is
done using vinyl tiles.
Materials Sound absorption coefficient
Wall .02
Wood .15
Glass .2
Acoustic Tile .72
Vinyl Tile .05
3. An Auditorium with a volume of 5000 cum has an optimal Reverberation
time of 0.8 sec.
1) The sound absorption power in m2-sabins is
2) During a convocation program the sound absorption power is
further increased by 200 m2-sabins. Calculate the new RT.
4. Excessively long R.T. can be easily detected in an existing Auditorium by
simply listening, because speech will be probably unintelligible and
music un-enjoyable in such a room. However, if the acoustical
correction of such an existing Auditorium is in-evitable, the correct
steps to be taken cannot be based on listening experience, i.e.
subjective judgement alone.
The average absorption coefficient a can be obtained from the
following equation.
a = A/S
A = the total absorption
S = Total Surface area
5. R.T. = 0.16𝑉/𝐴 + xV
If a is less than 0.1 the below formula is used
R.T. is the reverberation time in seconds.
0.16 is a constant
V is the volume of the room in m3
A is the total absorption in m2 units.
x is air attenuation coefficient
8. • Basic acoustical characteristic of all porous materials is a cellular
network of minute interlocking pores.
• They convert the incident sound energy into heat energy by the
frictional and viscous resistance within these pores and by vibration of
their small fibres.
• Fibreboards, mineral wools, insulation blankets, etc. are some of the
examples
• Their sound absorption is more efficient at the high than at the low
frequencies.
• Their acoustical efficiency improves in the low frequency region with
increased thickness and if spaced away from their solid backing
Porous Materials
10. Non-perforated panel or Membrane absorbers
• Any impervious material, installed on a solid backing but separated from it
by an air space, will be set to vibration when struck by sound waves.
• The flexural vibration of the panel absorber will then absorb a certain
amount of the incident sound energy by converting it into heat energy.
• The theory of absorption provided by a vibrating panel is rather
complicated but it is a fair approximation to assume that maximum
absorption will occur in the region of the resonance frequency of the panel.
• The resonance frequency is normally at the lower end of the audio-
frequency range, therefore panel absorbers are efficient as low frequency
absorbers.
• Wood and hardboard panelling, gypsum boards, suspended plaster
ceilings, furred out plasters, rigid plastic boards, windows, glazing, doors,
wood floors and plat-forms, etc.
12. Cavity (or Helmholtz) resonators
• They consist of an enclosed body of air confined within rigid walls and
connected by a narrow opening(called the neck) with the surrounding
space in which the sound waves travel.
• A cavity resonator of this type will absorb maximum sound energy in the
region of its resonance frequency.
• An empty jar or bottle, also acts as a cavity resonator; however, its
maximum absorption is confined to a very narrow frequency band.
Cavity resonators can be applied
1. As individual units
2. As perforated panel resonators
3. As slit resonator panels.
Helmholtz resonators
14. Individual cavity resonators were used a very long time ago in
Scandinavian Churches. These resonators were made of empty clay
vessels, indifferent sizes, so that their effective absorption (at
resonance frequencies) was spread between100 and400 cps (low
frequencies).
In contemporary room acoustical practice their application is
restricted to particular cases when individual low frequency peaks
within an exceptionally long R.T. of a room have to be reduced
drastically, without affecting the R.T. at medium and high frequencies.
Perforated panels, spaced away from a solid backing, provide a widely
used practical application of the cavity resonator principle.
They contain a large number of necks , constituting the perforation of
the panel, thus functioning as an array of cavity resonators.
The perforations are usually circular, seldom slotted.
The air space behind the perforation forms the undivided body of the
resonator, separated into bays by horizontal and vertical elements of
the framing system.