THERMAL CONDUCTIVITY AND POROSITY CHARACTERIZATION OF CALCARENITES STONES USED IN HISTORICAL BUILDINGS

2020 ◽  
Vol 21 (2) ◽  
pp. 237-250
Author(s):  
Abderrahim Samaouali ◽  
Hanane Sghiouri El Idrissi ◽  
Younes El Rhaffari ◽  
Mohamed Hraita ◽  
Abdelkrim Moufakkir ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Historical Buildings ◽  
Porosity Characterization

Characterization of Interconnect Defects Using Scanning Thermal Conductivity Microscopy

2004 ◽  
Author(s):  
H.W. Ho ◽  
J.C.H. Phang ◽  
A. Altes ◽  
L.J. Balk
Keyword(s):  
Thermal Conductivity ◽  
Integrated Circuits ◽  
Large Scale

Abstract In this paper, scanning thermal conductivity microscopy is used to characterize interconnect defects due to electromigration. Similar features are observed both in the temperature and thermal conductivity micrographs. The key advantage of the thermal conductivity mode is that specimen bias is not required. This is an important advantage for the characterization of defects in large scale integrated circuits. The thermal conductivity micrographs of extrusion, exposed and subsurface voids are presented and compared with the corresponding topography and temperature micrographs.

Characterization of an Improved dc Plasma Excitation Source

1980 ◽  
Vol 34 (1) ◽  
pp. 24-30 ◽  
Author(s):  
G. N. Coleman ◽  
W. P. Braun ◽  
A. M. Allen
Keyword(s):  
Thermal Conductivity ◽  
Direct Current ◽  
Direct Evidence ◽  
Plasma Jet ◽  
Sample Introduction ◽  
Direct Current Plasma ◽  
Actual Mechanism ◽  
Improved Stability ◽  
Plasma Excitation

Several modifications of the direct current plasma jet have resulted in significantly enhanced analysis capabilities. Reducing the electrode angle, decreasing the aerosol chimney size, and operating in a diffuse mode with helium have provided improved stability, sensitivity, freedom from interferences, and detection limits. While the actual mechanism of the helium enhancement is not clear, no direct evidence was found which supports participation in the excitation step. Rather, improved desolvation, vaporization and possibly sample introduction result from the thermal conductivity of helium being much greater than that of argon.

Anisotropic Thermal Conductivity of a Si/Ge Quantum Dot Superlattice

2000 ◽  
Author(s):  
Theodorian Borca-Tasciuc ◽  
Weili Liu ◽  
Jianlin Liu ◽  
Kang L. Wang ◽  
Gang Chen
Keyword(s):  
Thermal Conductivity ◽  
Quantum Dots ◽  
Molecular Beam ◽  
Conductivity Measurements ◽  
Transport Models ◽  
3Ω Method ◽  
Superlattice Structure ◽  
Anisotropic Thermal Conductivity ◽  
Ge Quantum Dot

Abstract In this work, we present experimental results on the in-plane and cross-plane thermal conductivity characterization of a Si/Ge quantum-dots superlattice structure. The quantum-dots superlattice was grown by molecular-beam-epitaxy and self-organization. The anisotropic thermal conductivity measurements are performed by a differential two-wire 3ω method. The measured in-plane and cross-plane thermal conductivity values show a different temperature behavior. The results are compared and explained with heat transport models in superlattices.

Empirical Equilibrium Study on Rice Husk and Eggshells as Low Cost Bioadsorbent for the Methylene Blue Removal

2014 ◽  
Vol 699 ◽  
pp. 221-226
Author(s):  
Nurul Hanim Razak ◽  
Md. Razali Ayob ◽  
M.A.M. Zainin ◽  
M.Z. Hilwa
Keyword(s):  
Methylene Blue ◽  
Rice Husk ◽  
Low Cost ◽  
Agricultural Waste ◽  
Textile Wastewater ◽  
Blue Dye ◽  
Rice Husks ◽  
Equilibrium Study ◽  
Porosity Characterization

Eggshells and rice husk, two types of notable agricultural waste were used as bioadsorbent to remove Methylene Blue dye (MBD) in aqueous solution. This study was to investigate the performance of these two bioadsorbents in removing MBD. The removal percentage, adsorption capacity, and porosity characterization were examined. The method applied was a physical filtration. UV-VIS Spectrophotometer was used to determine the efficiency of the bioadsorbents in MBD adsorption. The highest removal percentage at the most concentrated MBD were 51% and 98% for eggshells and rice husks respectively. Meanwhile the characterization of rice husks pore size and volume proves that higher adsorptivity towards dye compares to eggshells porosity. It was concluded that the eggshells and rice husks bioadsorbents was successful to treat industrial textile wastewater with rice husks as the most efficient bioadsorbent in removing MBD.

Thermal conductivity characterization of in-situ fabricated polysilicon nanowires for uncooled thermoelectric infrared detectors

2015 ◽  
Author(s):  
Mohammad J. Modarres-Zadeh ◽  
Nahida Akhter ◽  
Ronald Hellmer ◽  
Michael Aragon ◽  
Reza Abdolvand
Keyword(s):  
Thermal Conductivity ◽  
Infrared Detectors

Evaluation of Thermal Characterization Techniques and Tools for Thermal Conductivity Measurement of Sub 100 Angstrom Thick Silicon Layers

2007 ◽  
Author(s):  
Keivan Etessam-Yazdani ◽  
Mehdi Asheghi
Keyword(s):  
Thermal Conductivity ◽  
Conductivity Measurement ◽  
Thermal Characterization ◽  
Phonon Transport ◽  
Thermal Conductivity Measurement ◽  
Great Success ◽  
Silicon Structures ◽  
Thin Silicon ◽  
20 Nm

Experimental measurement of thermal conductivity is considered the most reliable tool for the study of phonon transport in ultra-thin silicon structures. While there has been a great success in thermal conductivity measurement of ultra-thin silicon layers down to 20 nm over the past decade, it is not clear if the existing techniques and tools can be extended to the measurements of sun 100 Angstrom layers. In this paper, an analytical study of the feasibility of electrical Joule heating and thermometry in patterned metal bridges is presented. It is concluded that thermal conductivity of silicon layers as thin as 5 nm can be obtained (uncertainty 20%) by performing steady-state measurements using an on-substrate nanoheater structure. The thermal characterization of silicon layers as thin as 1 nm may be possible using frequency domain measurements.

scholarly journals Hygrothermal and Acoustical Performance of Starch-Beet Pulp Composites for Building Thermal Insulation

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1622 ◽  
Author(s):  
Hamzé Karaky ◽  
Chadi Maalouf ◽  
Christophe Bliard ◽  
Tala Moussa ◽  
Nadim El Wakil ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Potato Starch ◽  
Test Results ◽  
Optimal Composition ◽  
Green Composite ◽  
Co2 Gas ◽  
Acoustical Properties ◽  
Beet Pulp ◽  
Hygric Properties

This article deals with the elaboration and the characterization of an innovative 100% plant-based green composite made solely of beet pulp (BP) and potato starch (S). Using this type of material in insulation applications seems a good solution to reduce the CO2 gas emissions in building. The influence of the starch amount on composite characteristics was studied. Four mixtures were considered with different S/BP mass ratios (0.1, 0.2, 0.3 and 0.4). The physical properties of these materials were studied in terms of porosity, apparent and absolute densities, thermal conductivity, and hygric properties. The influence of humidity content on acoustical properties was studied as a function of frequency. Test results show a real impact of both starch and humidity contents on the hygrothermal and acoustical properties of the studied material due to the porosity. The composite with the lowest amount of starch (S/BP = 0.1) seems to be the optimal composition in terms of the hygrothermal and acoustical behaviors.

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