The effects of acoustical ceiling panel type and penetrations forservices on vertical sound isolation inside buildings

2021 ◽  
Vol 150 (4) ◽  
pp. A248-A248
Author(s):  
Gary Madaras
Keyword(s):  
Panel Type ◽  
Vertical Sound

The effects of acoustical ceiling panel type and penetrations for services on vertical sound isolation inside buildings

2021 ◽  
Vol 263 (2) ◽  
pp. 4238-4245
Author(s):  
Gary Madaras
Keyword(s):  
Transmission Loss ◽  
Sound Intensity ◽  
Room Acoustics ◽  
Panel Type ◽  
Absorption Performance ◽  
Sound Transmission Class ◽  
The Individual ◽  
Sound Maps ◽  
Isolation Performance ◽  
Vertical Sound

Attenuation of sound transmitting between rooms oriented over one another inside buildings is studied. Transmission loss and sound transmission class were measured by an independent, accredited, acoustics laboratory with and without a variety of modular acoustic ceilings suspended under a baseline concrete floor structure. Ceiling panel material types include stone wool, fiberglass and mineral fiber. Ceilings were tested with and without the presence of service penetrations for supply air diffusers, return air grilles and light fixtures. Some ceilings were also scanned with a sound intensity probe and the resulting color sound maps are used as a supplemental method of evaluating both isolation and absorption performance of the individual components of the ceiling systems. Results show that while the effects of ceiling panel type on absorption performance, and thus room acoustics, is substantial, the material type and weight of the ceiling panels do not substantially affect the overall isolation performance of the floor-ceiling assembly.

ZIRCADYNE 706

Alloy Digest ◽  
1983 ◽  
Vol 32 (5) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Heat Exchangers ◽  
Heat Treating ◽  
Chemical Compositions ◽  
Chemical Processing ◽  
Lower Oxygen ◽  
Panel Type

Abstract ZIRCADYNE 706 is a zirconium-niobium (columbium) alloy containing 2-3% niobium. It is similar in chemical compositions (except for slightly lower oxygen) to Zircadyne 705 (Alloy Digest Zr-8, July 1982). Zircadyne 706 was developed specifically for severe forming applications such as panel-type heat exchangers. The corrosion resistance of Zircadyne 706 is identical to that of Zircadyne 705 but its tensile and yield strengths are slightly lower. It is recommended for chemical processing applications. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Zr-10. Producer or source: Teledyne Wah Chang Albany.

scholarly journals Prototype of the Near-Infrared Spectroscopy Expert System for Particleboard Identification

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Anna Sandak ◽  
Jakub Sandak ◽  
Dominika Janiszewska ◽  
Salim Hiziroglu ◽  
Marta Petrillo ◽  
...  
Keyword(s):  
Quality Control ◽  
Expert System ◽  
Near Infrared ◽  
System Development ◽  
Nir Spectroscopy ◽  
Original System ◽  
Adhesive System ◽  
Type Composition ◽  
Wide Range ◽  
Panel Type

The overall goal of this work was to develop a prototype expert system assisting quality control and traceability of particleboard panels on the production floor. Four different types of particleboards manufactured at the laboratory scale and in industrial plants were evaluated. The material differed in terms of panel type, composition, and adhesive system. NIR spectroscopy was employed as a pioneer tool for the development of a two-level expert system suitable for classification and traceability of investigated samples. A portable, commercially available NIR spectrometer was used for nondestructive measurements of particleboard panels. Twenty-five batches of particleboards, each containing at least three independent replicas, was used for the original system development and assessment of its performance. Four alternative chemometric methods (PLS-DA, kNN, SIMCA, and SVM) were used for spectroscopic data classification. The models were developed for panel recognition at two levels differing in terms of their generality. In the first stage, four among twenty-four tested combinations resulted in 100% correct classification. Discrimination precision with PLS-DA and SVMC was high (>99%), even without any spectra preprocessing. SNV preprocessed spectra and SVMC algorithm were used at the second stage for panel batch classification. Panels manufactured by two producers were 100% correctly classified, industrial panels produced by different manufacturing plants were classified with 98.9% success, and the experimental panels manufactured in the laboratory were classified with 63.7% success. Implementation of NIR spectroscopy for wood-based product traceability and quality control may have a great impact due to the high versatility of the production and wide range of particleboards utilization.

scholarly journals Heat and Velocity Parameters of a Non-Isothermal Flow Generated by a Double-Chamber Air Diffuser

2012 ◽  
Vol 7 (1) ◽  
pp. 23-32
Author(s):  
Hanna Klymenko
Keyword(s):  
Air Flow ◽  
Relative Length ◽  
Isothermal Flow ◽  
Panel Type ◽  
Double Chamber

Abstract Heat and velocity parameters of the non-isothermal flow generated by a source panel-type double-chamber air diffuser with four horizontal shelf pressure equalizers of optimal relative length at the mid-horizontal level and in the vertical axisymmetrical plane. Irregularity ratios of initial velocities and temperatures of the air flow under study have also been defined.

scholarly journals How the Post-Fracture Rehabilitation Choice Affects Brain Function in Older People?

2019 ◽  
Vol 9 (1) ◽  
pp. 34-43
Author(s):  
Noriko Mitsuboshi ◽  
Minoru Kouzuki ◽  
Shigeru Mochida ◽  
Kanehito Morimoto ◽  
Katsuya Urakami
Keyword(s):  
Spectral Analysis ◽  
Brain Function ◽  
Therapy Group ◽  
Power Spectral Analysis ◽  
Antioxidant Potential ◽  
Coherence Analysis ◽  
Power Spectral ◽  
Panel Type ◽  
Potential Methods ◽  
The Impact

Background: We investigated how the type of rehabilitation affects brain function and antioxidant potential. Methods: Twenty-eight patients hospitalized for fall-related fractures were assigned to either a physical therapy group or an occupational therapy group. Cognition was assessed using the Touch Panel-type Dementia Assessment Scale (TDAS) and oxidative stress with serum pentosidine levels. Spectral analysis and coherence analysis were also performed. Results: Changes in TDAS scores and serum pentosidine levels did not differ significantly between the 2 therapies. Power spectral analysis revealed a significant intergroup difference in δ waves. Coherence analysis showed significant intergroup differences in the activities of δ waves and β waves. Conclusions: Cognitive function and antioxidant potential did not differ between the 2 types of rehabilitation. However, the impact on cerebral neuronal activity may have differed.

Comparative Estimation of the Effect from Using Different Coolants in Panel-Type Radiators of Spacecrafts

2018 ◽  
Vol 65 (11) ◽  
pp. 825-832
Author(s):  
N. N. Volkov ◽  
L. I. Volkova ◽  
A. L. Grigor’ev ◽  
D. N. Il’mov ◽  
A. V. Karevskii ◽  
...  
Keyword(s):  
Panel Type
Sign in / Sign up

Export Citation Format

Share Document