Published in Korean Journal of Chemical Engineering
High-pressure thermogravimetric analyzer was employed to investigate the effects of pressure on the thermal decomposition process, which is the very first step in most coal utilizing processes, and pyrolyzates from TGA were analyzed by on-line GC/MS. Results showed that pyrolysis of coal with steam under high-pressure conditions exhibited a slower ...
In this paper we report the synthesis of highly conducting doped hydrogenated micro-crystalline silicon films, prepared by Cat-CVD deposition using silane and trimethyl boron (TMB) with hydrogen dilution at substrate temperatures as low as 110°C, having a conductivity of approximately 1 Ω−1 cm−1. All the films are microcrystalline and show the char...
Diamond films with dominant (100) texture were grown with a temperature gradient across the Si (100) substrates using hot filament chemical vapor deposition technique. Deposition was carried out with 0.8% CH4 in balance hydrogen at an average substrate temperature of 880°C. The deposition pressure was varied between 20-120 torr. Films were characte...
The phenomenon of ratchetting is defined as constant accumulation of plastic strain or deformation under combined steady state and cyclic loading. It can reduce the fatigue life or can cause failure of piping components or systems subjected to seismic or other cyclic loads. The uniaxial ratchetting characteristics of SA333 Gr.6 steel have been inve...
The self-supported diamond sheets were deposited at various deposition pressure (Pd) using HFCVD technique. The sheets were characterized using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM). XRD shows the growth of cubic diamond. This is confirmed by Raman spectroscopy showing a sharp line at 1332 cm−1 in all the s...
Earth-retaining structures constitute an important topic of research in civil engineering, more so under earthquake conditions. For the analysis and design of retaining walls in earthquake-prone zones, accurate estimation of dynamic earth pressures is very important. Conventional methods either use pseudo-static approaches of analysis even for dyna...
Insertion profiles of antitubercular drugs isoniazid (INH), rifampicin (RFM) and ethambutol (ETH) into dipalmitoylphosphatidylcholine (DPPC) membrane models were evaluated by Langmuir monolayer technique. Maximum drug insertion into DPPC monolayer was observed with rifampicin with a surface pressure increase (Δπmax) in the range of 21-33 mN/m depen...
A P-layer can be formed on a SiC wafer surface by using multiple Al ion implantations and post-implantation annealing in a low pressure CVD reactor. The Al depth profile was almost box shaped with a height of1×1019cm-3 and a depth of550 nm. Three different annealing processes were developed to protect the wafer surface. Variations in RMS roughness ...
A series of transition films from amorphous to microcrystalline silicon was successfully prepared by very high frequency plasma enhanced chemical vapor deposition(VHF-PECVD).Effects of gas pressure on the microstructure, photoelectric and transport properties of the films were investigated.The results indicate that increase of gas pressure improve ...
This paper investigates experimentally and numerically pressure effects on soot production and radiative heat transfer in non-buoyant opposed-flow flames spreading over wires coated by Low Density PolyEthylene (LDPE). Experiments, conducted in parabolic flights, consider pressure levels ranging from 50.7 kPa to 121.6 kPa and an oxidizer flowing par...
