Materials Literature
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Strength degradations of porous silicon carbide hot gas filters bonded with clay and calcium carbonate are investigated in the simulated condition of the pressurized fluidized bed combustion (PFBC). Thermal cycling, static fatigue, thermal shock, and hot corrosion tests are conducted to differentiate the independent p…
Some of the practical limitations of conventional electrical method for measurement of Partial Discharge (PD), especially at site, have lead to the development of alternate methodologies. Acoustic emission (AE) technique is one among them. PD detection based on AE technique is gaining importance due to the advantages…
We designed and synthesized new SmA* liquid crystals with different molecular architectures based on the chiral mesogen MR11, which was unsubstituted, or attached at one end and at both ends of a trisiloxane segment in the monosubstituted MSi3-MR11 and disubstituted DSi3-MR11 siloxanes, respectively. We studied the cr…
To confirm the applicability of thermally induced ultrasound emission from nanocrystalline porous silicon (nc-PS) devices as directional sound emitter, the radiation pattern of one-dimensionally arrayed nc-PS device have been investigated. The nc-PS emitter is fabricated on a p-type Si substrate by conventional electr…
Non- and grain-oriented electrical steels were tested in an Epstein frame. The materials were magnetised under sinusoidal flux waveform at 20, 50 and 150 Hz. Loss was separated into hysteresis, eddy current and excess loss components. The relationship between the hysteresis angle, additional loss factor and the magnet…
A kind of medical collagen was prepared by hydrogel formation method. Chemical and physical properties were investigated by FTIR, amino acid analysis, SDS-PAGE, carbohydrate content analysis, heavy metal content analysis. Degradation experiments in vivo and subsequent histological investigations were carried out to ev…
Beam steering liquid crystal devices employed in telecommunication networks suffer from high crosstalk. This is due to the limited resolution arising from the finite extent of the liquid crystal elastic deformation and the electric field fringing. In this paper we show how non-periodic phase elements (holograms) can r…
<abstract language="eng">Aluminum oxide was dispersed on a commercial silica gel surface, using successive grafting reactions. The reaction products were characterized by N2 adsorption-desorption isotherms, scanning electron microscopy and infrared spectroscopy. The progressive incorporation of aluminum, up to 5.5% (w…
The molar (K(C)(o/w)) and rational (K(X)(o/w)) partition coefficients in the octanol/buffer, i-propyl myristate/buffer, chloroform/buffer, and cyclohexane/buffer systems were determined for acetanilide and phenacetin at 25.0, 30.0, 35.0, and 40.0 degrees C. In all cases except for cyclohexane, the K(C)(o/w) and K(X)(o…
Liquefied benzylated wood based Polyurethanes (PUs) are synthesized with excess toluene diisocyanate (TDI), isophorone diisocyanate (IPDI) and hexamethylene diisocyanate (HDI). Four polyethylene glycols (PEG) of molecularweight 400, 600, 1000 and 2000 are mixed with liquefied wood using dibasic ester (DBE) as liquefac…
Density Functional (B3LYP/LANL2DZ) calculations for ammonia metal clusters were done in order to obtain bond lengths, M-N stretching vibrational modes, binding energies, Mulliken atomic charges and adiabatic ionization potentials. The results indicate that copper atom forms stronger bonds with ammonia than silver or g…
Abstract Pulsed and continuous‐wave (CW) lasers were compared as excitation sources for surface‐enhanced resonance Raman scattering (SERRS). CW excitation provided SERRS spectra with a greater signal‐to‐noise ratio and more sensitive detection by a factor of ∼50 compared with the high peak power, low repetition rate p…
Abstract CP (Cetylpyridinium)-exchanged smectite was manufactured by the cationic exchange reaction of Na-smectite with CP. The adsorption behaviour shows a typical L-type isotherm representing continuous and stable adsorption in excess of twice the cation exchange capacity of CP. CP-smectite shows a strong interlayer…
Martensitic phase transformation from the β to the α'' phase (and vice versa ) in a TiNbAl alloy system has been studied by ultrasound spectroscopy. Resonance frequencies and corresponding internal frictions are measured from ambient temperature to 12 K by electromagnetic acoustic resonance (EMAR) and resonant ultraso…
Novel photochromic chemosensors for alkali-, alkali-earth and d-metal cations were synthesized and their photochemical and complexing properties investigated with the use of UV/vis, IR, 1H/7Li NMR spectroscopy and quantum chemical calculations – DFT(B3LYP/6-31G).
Abstract We report here the first electrochemical method to prepare a roughened gold substrate with bimetallic silver and gold nanoparticles. First, a silver substrate was roughened by a triangular‐wave oxidation–reduction cycle in 0.1 N HCl aqueous solutions. Silver‐containing complexes were found in the solution aft…
We have proposed two methods for measuring liquid crystal response times using a microwave resonance method and an optical transmitted light measurement method. In this paper, the response time characteristics for the paralleled nematic and twisted nematic liquid crystal layer structures were investigated by using two…
The temperature dependence of the piezoelectric properties of0.67Pb(Mg 1/3 Nb 2/3 )O 3 -0.33PbTiO 3 and 0.955Pb(Mg 1/3 Nb 2/3 )O 3 -0.045PbTi03 single crystals, respectively grown by Bridgman and modified Bridgman method was investigated. Due to their low rhombohedral to tetragonal transition temperature (T n = 90°C a…
The corrosion of carbon steel in contact with synthetic calcareous natural waters containing sulphate ions was investigated. Since the diffusion process is a determining factor in the corrosion kinetics through the reduction of dissolved oxygen, use was made of a rotating disc electrode. The development of the open ci…
Die bei thermischen und katalytischen Spaltprozessen anfallenden n-Butengemische werden u. a. als Edukt für Verfahren der Oligomerisierung eingesetzt. Dabei entstehen beim Einsatz von Festkörpersäurekatalysatoren Oligomerisate mit hohen Anteilen an verzweigten Olefinen, die nach Stabilisierung als Vergaserkraftstoff-…