Materials Literature
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Sol-gel method and successive thermal treatments in vacuum and nitrogen atmosphere were employed to synthesize magnetite nanoparticles isolate them with the aid of amorphous silica. Thermogravimetric and differential thermal analyses coupled with mass spectrometry, X-ray diffraction, transmission electron microscopy,…
Aligned carbon nanotubes were prepared by plasma-enhanced hot filament chemical vapor deposition using CH4, H2, and NH3 as reaction gases. It was investigated how different negative bias affects the growth of aligned carbon nanotubes. The results indicate that the average diameter of the aligned carbon nanotubes is re…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation C. H. Joshi, A. Mavanur, C.‐Y. Tai, Z.‐X. Han, A. J. Rodenbush, Y. Wong; Cryogenic Magnetostricti…
In this paper, charge storage and its dynamics in positively corona char ged polytetrafluoroethylene（PTFE） film electrets have been studied. It is foun d that from room temperature to 100℃ and from about 150℃, especially from 180 ℃ to higher temperatures, slow retrapping controls the transport of detrapped c h arge; h…
In modern microelectronics, where extreme miniaturization has led to feature sizes in the sub-micron and nanoscale range, Fourier diffusion has been found to be inadequate for the prediction of heat conduction. Over the past decade, the phonon Boltzmann transport equation (BTE) in the relaxation time approximation has…
In the document "Strategy of Nuclear Power Development in Russia for the First Half of XXI Century", approved by the Government of the RF, seawater desalination is considered as a prospective area of application of the small-sized nuclear power plants (SNPP). Taking into account vast water resources of Russia evenly d…
Positron annihilation spectroscopy (lifetime and Doppler broadening techniques), transmission Mössbauer spectroscopy, integral low-energy electron Mössbauer spectroscopy and transmission electron microscopy were applied to examine thermally treated reactor pressure vessel steels (RPV). The results of these methods obt…
A theory is presented for the application of Hill's matrix method to the calculation of the reflection and transmission spectra of multitone holographic interference filters in which the permittivity is modulated by a sum of repeating functions of arbitrary period. Such filters are important because they may have two…
Thermal history dependent primary dendrite spacing during directional solidification was investigated using a combined cellular automaton-finite difference model. This model simulates the key phenomena occurring during dendritic growth, including overgrowth and branching. The dependence of primary spacing upon the the…
The preparation of hybrid materials of poly(ethylene terephthalate) (PET) with montmorillonite (Mont) clay was investigated using anchor monomers, i.e. hydroxyethyl isonicotinamide (HENA) or hydroxypentyltrimethylammonium iodide (HPTA), which both have cationic substituents to adsorb onto clay surfaces and a hydroxyet…
A model for the combustion of methane-air mixtures in the presence of a catalyst in a packed-bed reactor has been developed. The one-dimensional model accounts for both gas-phase (homogeneous) and catalytic surface (heterogeneous) reactions. These reactions are modeled as single-step reactions of the Arrhenius type. H…
Optica Applicata, Vol. 34, 2004, nr 4, s. 551-561
New troponoid liquid crystals with a tropone terminal group were prepared. Tropon-4-yl 4-n-alkoxybenzoates (1T) had a monotropic smectic A phase. However the corresponding benzenoid derivatives (1B), tropolon-5-yl 4-n-alkoxybenzoates (2T), 2-methoxytropon-5-yl 4-n-alkoxybenzoates (3T), and tropon-2-yl 4-n-alkoxybenzoa…
The use of polymer microspheres for producing fine-cellular foams is a new development in rotational molding. In previous studies, some reduction in mechanical properties has been found due to the immiscibility between the polymer shell and the matrix polymer. Coupling agents can act as a molecular bridge at this inte…
A centrally loaded round panel test was used to characterize the fracture energy of FRC under low velocity impact loading. The specimens, with a diameter of 650 mm and a thickness of 60 mm, were cast using plain high strength concrete (HSC, f’c = ~80 MPa), steel fiber reinforced HSC and a synthetic fiber reinforced HS…
Driving down processing costs on military and commercial aerospace components is an unending quest for the process metallurgist. Concurrently, the integrity of the powder metal (PM) component must be maintained or improved in these high strength, high temperature, fatigue limited components. A unique processing route,…
Different low thermal expansion ceramics of Ca1-xSrxZr4(PO4)6 system with x = 0, 0.25, 0.5 and 0.75 were synthesized by the solid state reaction method. After several heat treatments finished products were obtained at 1300°C. These were characterized for phase purity by X-ray Diffractometry and IR Spectroscopy. Densif…
Sol-gel technique has been utilized to deposit heterostructured Ba0.5Sr0.5TiO3:MgO (BST:MgO) films with different BST/MgO layer sequences and thicknesses in order to achieve enhanced microwave properties. The correlation between the structure, microstructure, and the dielectric properties are presented. Eight element…
The three-dimensional X-ray diffraction (3DXRD) method is reviewed. The method is based on the use of high-energy X-rays from synchrotron sources and a ‘tomographic’ approach to diffraction. With 3DXRD the structure of the embedded grains within polycrystals or powders can be characterised non-destructively within mil…
The synthesis of a series of novel multipodes based on disc-shaped mesogens with a siloxane core is described. Their phase behaviour is characterised and compared to the liquid crystalline properties of the discotic molecules without the siloxane moieties. We observed that incorporation of the siloxane group results i…