Numerical study of airflow and temperature variations inside car at different solar intensity angles

2022 ◽  
Author(s):  
Jinan Mahdi Hadi ◽  
Nazar Yasir Jasim ◽  
Muna Hameed Alturaihi ◽  
Laith Jaafer Habeeb
Keyword(s):  
Numerical Study ◽  
Temperature Variations ◽  
Solar Intensity

A 3D Numerical Study to Investigate the Effects of Temperature Variation and Residual Stresses in Representative Volume MEMS Elements

2010 ◽  
Author(s):  
A. R. Maligno ◽  
D. C. Whalley ◽  
V. V. Silberschmidt
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Residual Stresses ◽  
Numerical Study ◽  
Manufacturing Processes ◽  
The Finite Element Method ◽  
Physics Of Failure ◽  
Temperature Variations ◽  
Failure Initiation ◽  
Effects Of Temperature

The reliability of MEMS, and in particular of RF MEMES switches, might be increased by the use of a Physics of Failure (PoF) methodology. A numerical study, based on the finite element method (FEM), has been carried out to investigate the effects of temperature variations on failure (e.g. yielding of metals) onset within multilayered MEMS structures. Furthermore, the manufacturing processes of MEMS are the main sources of residual stresses development and they represent one of the most profound factors reducing the functionality and reliability of MEMS packages. Therefore, the effect of residual stresses on failure onset has been considered in these studies to examine their effects on MEMS reliability. Numerical results have shown that failure initiation is strongly influenced by the loading conditions (i.e. different range of temperatures), boundary conditions and finally by the presence of residual stresses.

scholarly journals Damage Localization of an Offshore Platform considering Temperature Variations

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Shuqing Wang ◽  
Min Zhang ◽  
Huajun Li
Keyword(s):  
Temperature Variation ◽  
Numerical Study ◽  
Offshore Platform ◽  
Structural Safety ◽  
Effect Of Temperature ◽  
Modal Parameters ◽  
Damage Localization ◽  
Offshore Structure ◽  
Modal Strain Energy ◽  
Temperature Variations

Modal parameters are sensitive indicators of structural damages. However, these modal parameters are sensitive not only to damage, but also to the environmental variations. Development of vibration based damage detection methodology which is robust to environmental variation is essentially important for the structural safety. The present paper utilizes a recently developed modal strain energy decomposition (MSED) method to localize the damage of an offshore structure. A progress of the present paper is to take the temperature variation into consideration and Monte Carlo simulation is introduced to investigate the effect of temperature variation on the robustness of damage localization. Numerical study is conducted on an offshore platform structure considering the temperature variation. Several damage cases, including single and double damage scenarios, are included to investigate the damage localization algorithm. Results indicate that the MSED algorithm is able to detect the damage despite the temperature variations.

Observations of the spatial structure of interstellar hydrogen

1967 ◽  
Vol 31 ◽  
pp. 45-46
Author(s):  
Carl Heiles
Keyword(s):  
High Resolution ◽  
Spatial Structure ◽  
Velocity Dispersion ◽  
Temperature Variations

High-resolution 21-cm line observations in a region aroundlII= 120°,b11= +15°, have revealed four types of structure in the interstellar hydrogen: a smooth background, large sheets of density 2 atoms cm-3, clouds occurring mostly in groups, and ‘Cloudlets’ of a few solar masses and a few parsecs in size; the velocity dispersion in the Cloudlets is only 1 km/sec. Strong temperature variations in the gas are in evidence.

Clean Electron Microscope Substrate Films Used for Micrometeorite Collection and Study

1967 ◽  
Vol 25 ◽  
pp. 366-367
Author(s):  
D. M. Davies ◽  
R. Kemner ◽  
E. F. Fullam
Keyword(s):  
Thin Film ◽  
Electron Microscope ◽  
High Altitude ◽  
Amyl Acetate ◽  
Temperature Variations ◽  
Film Forming ◽  
Film Specimen ◽  
Particulate Contaminants

All serious electron microscopists at one time or another have been concerned with the cleanliness and freedom from artifacts of thin film specimen support substrates. This is particularly important where there are relatively few particles of a sample to be found for study, as in the case of micrometeorite collections. For the deposition of such celestial garbage through the use of balloons, rockets, and aircraft, the thin film substrates must have not only all the attributes necessary for use in the electron microscope, but also be able to withstand rather wide temperature variations at high altitude, vibration and shock inherent in the collection vehicle's operation and occasionally an unscheduled violent landing.Nitrocellulose has been selected as a film forming material that meets these requirements yet lends itself to a relatively simple clean-up procedure to remove particulate contaminants. A 1% nitrocellulose solution is prepared by dissolving “Parlodion” in redistilled amyl acetate from which all moisture has been removed.

Numerical study of the low-frequency atomic dynamics in a Lennard-Jones glass

1998 ◽  
Vol 77 (2) ◽  
pp. 473-484 ◽  
Author(s):  
M. Sampoli, P. Benassi, R. Dell'Anna,
Keyword(s):  
Numerical Study ◽  
Low Frequency ◽  
Lennard Jones
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