natural convective heat transfer of nano-fluid in porous media is present in many advanced engineering applications. in this work, this problem has been computationally simulated, using lbm. the configuration used includes a cold exterior region and hot interior cylinders with one-, two-, or three-cylinder arrangements. however, the effective area for heat transfer has been kept the same for al...

Toshiki NIINO, Shunsuke OIZUMI and Kazuki SATO, Institute of Industrial Science, The University of Tokyo, Japan 4-6-1 Komaba Meguro Tokyo, 153-8505 Japan [email protected] ABSTRACT Reviewed, accepted September 10, 2008 Research is being performed on a laser sintering process in which inorganic filler is employed as porogen at a high content to fabricate highly porous three dimensional tis...

OBJECTIVES The purpose of this study was to analyze the behavior in water, related to mechanical properties, of experimental composites for dental restoration. METHODS The studied materials were composed of a visible-light-curing monomer mixture (Bis-GMA and TEGDMA or HEMA) and micrometric, nanometric or a mixture of both sizes hydroxyapatite particles as a reinforcing filler. Filler particle...

This paper presents results of porous Sic characterization using photoluminescence, Raman scattering and Atomic Force Microscopy. A comparative optical spectroscopy study on bulk Sic and porous Sic layers has shown a number of new features specific to nano-crystallite materials. The role of these effects on optical spectroscopy data in porous Sic accessed by photoluminescence and Raman scatteri...

A cooling system with impinging jets is used extensively in diverse engineering applications, such as solar panels, electronic equipments, battery thermal management, textiles and drying applications. Over the years many methods have been offered to increase effectiveness of design by different techniques. In one available methods, nano-jets are achieve a higher local average heat transfer coef...

In recent years, spinel-type compounds have attracted great interest because of their gem-like qualities. However, little is known of their gas sensing properties. We report, in this paper, on a self-assembly method to prepare porous ZnCo2O4 (ZCO) nano/microspheres by a facile one-step solvothermal process and subsequent annealing. Abundant techniques were used to characterize the morphology an...

: [email protected] .ac.cn (W. Han). Abstract The unique micro-sized (2–10 mm) Si/C composites consisting of 20 nm carbon coated secondary Si were synthesized from the abundant and low cost Al–Si alloy ingot by acid etching, ball-milling and carbonization procedure. The nano-porous Si/C composites provide a capacity of 1182 mAh g 1 at a current density of 50 mAg , 952 mAh g 1 at 200 mAg , 815 mAh g...

Electrocatalysis offers great promise for water purification but is limited by low active area and high uncontrollability of electrocatalysts. To overcome these constraints, we propose hybrid bulk electrodes synthesizing binding a Pd nanocatalyst (nano-Pd) to the via amyloid fibrils (AFs). The AFs template effective controlling nucleation, growth, assembly nano-Pd on electrode. In addition, thr...

A functional magnesium hydroxide/lignin hybrid system was prepared by grinding and mixing the pure precursors using a planetary ball mill. In addition, the thermal stability was assessed based on the total mass loss of the hybrid system within the temperature range of 30–1000 ◦C, which amounted to 38%. Moreover, the average particle size was at 4.9 μm as determined by the laser diffraction meth...