Materials Literature
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The absorption spectra, temperature dependence of light transmission, and dc resistivity of ${\mathrm{La}}_{0.92}{\mathrm{Ca}}_{0.08}\mathrm{Mn}{\mathrm{O}}_{3}$ single crystal are investigated. The volume of the metallic phase in insulating matrix is evaluated by analyzing the temperature dependence of the light abso…
We report near-edge absorption fine structure (NEXAFS) and UV photoemission spectroscopy (UPS) studies of aligned single-walled carbon nanotube films on Si(100) substrates. Orientation of the films was detected in the NEXAFS spectra, with the intensity of the π* core exciton at 284.4 eV showing a strong dependence on…
Cyclic oxothiomolybdates containing polyphosphate ions were prepared by simple reactions in aqueous medium of the corresponding polyphosphate ions and the cyclic precursor K(2)I(2)Mo(10)S(10)O(10)(OH)(10)(OH(2))(5).15H(2)O. K(5)[Cl(P(2)O(7)]Mo(12)S(12)O(12)(OH)(12)(H(2)O)(4)].22H(2)O (1) was isolated from concentrated…
The influence of uniaxial mechanical stress on the magnetization processes and energy losses in nonoriented Fe-Si steels is investigated under alternating and circular rotational flux. The advanced waveform control and measurement technique allow creating any kind of magnetic flux from alternating in all directions to…
Novel oxide dispersion strengthened (ODS) metals were synthesised by mechanical alloying (MA) and subsequent consolidation via hot pressing in protective argon atmosphere. The effect of dispersoid size and volume fraction on the electrical and mechanical properties is exemplified with Cr 2 O 3 , CaO and Y 2 O 3 as mod…
Abstract The effects of polyolefins composition, that is polyethylene (PE), polypropylene (PP) and a ethylene/propylene copolymer (EPM) of 45/55 monomer ratio, and of operating conditions (screw speed, throughput and screw configuration) on the grafting of maleic anhydride (MA) were investigated. Sampling devices loca…
Abstract Three new 2,5‐bis(1,3‐dithiolan‐2‐ylidene)‐1,3,4,6‐tetrathiapentalene (BDH‐TTP) radical cation salts with the photochromic nitroprusside anion have been synthesized: κ‐(BDH‐TTP) 4 [FeNO(CN) 5 ]·NB ( 1 ), κ‐(BDH‐TTP) 4 [FeNO(CN) 5 ] ( 2 ), and (BDH‐TTP) 2 [FeNO(CN) 5 ] ( 3 ). The salts were characterized by si…
Classical flame-retardant treatments for cellulosic materials are phosphorous-nitrogen-based compounds. In this work, cotton fabric is treated with different formulations based on diguanidine hydrogen phosphate (DGHP) or monoguanidine dihydrogen phosphate (MGHP), individually or in combination with a resin (melamine)…
Recently, a high value nonlinear parameter of liquid containing contrast agents (encapsulated microbubbles) has been reported by some measurements, however an effective way to study it theoretically has not been found so far. In this paper, an approach, based on the concept of the equivalent nonlinear parameter is pre…
For a large number (more than 60) of polyoxometalates (POM) of tungsten, molybdenum, and vanadium, the charges on metal cations of the coordination sphere have been calculated using the extended Hückel molecular orbital method, and obtained values are compared with the NMR chemical shifts of the corresponding nuclei.…
Abstract A new unsymmetrical chiral thioindigo dopant 6‐[( R , R )‐2,3‐difluorooct‐1‐yloxy]‐5′‐nitro‐6′‐[( R )‐2‐octyloxy]thioindigo ( 4 ) designed to photoinvert the sign of spontaneous polarization ( P S ) in a ferroelectric chiral smectic C (SmC*) liquid crystal was prepared using a synthetic approach previously de…
A new approach to the modification of carbon nanotubes with biomolecules for the development of nanoscale biosensors is presented. Alkaline phosphatase was immobilized on the surface of multi-wall carbon nanotubes utilizing a layer-by-layer methodology. Carbon nanotubes were incubated with streptavidin, resulting in t…
The optical, magnetooptical, and electric properties of epitaxial (La 1− x Pr x ) 0.7 Ca 0.3 MnO 3 films (0≤ x ≤1) grown by MOCVD on LaAlO 3 and SrTiO 3 substrates were studied. It is shown that the decrease in the average cation radius resulting from isovalent substitution of the Pr for La ions brings about a lowerin…
Nanostructured porous silica particles with sizes in the micrometer to sub‐micrometer range are of great interest due to their potential applications as catalyst supports and nanocomposite materials. However, if these particles are to be used in industry, a process must be developed to affordably produce them on a lar…
Ten virgin powder samples of poly(tetrafluoroethylene) (PTFE) were examined by differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS). The samples, prepared by emulsion or nanoemulsion polymerization, differed by average molecular weight and particle size. DSC was used to study the trends of th…
The dynamics of pitch jumps in cholesteric layers with a finite surface anchoring strength under variations in temperature is investigated theoretically. General expressions are presented that connect the dynamics of pitch jumps with the parameters that determine the process, such as the viscosity, the specific form o…
This paper is concerned with two-phase flow regimes and characteristics of coolant natural circulation around a reactor pressure vessel (RPV) in in-vessel retention (IVR) scenarios when the external vessel flooding is applied to arrest a hypothetical core melt accident. We focus on the AP1000 advanced plant design, an…
By using the time-resolved small-angle light scattering (TRSALS) technique, we present the real-time measurement of the physical gelation process for a crystalline polymer. To investigate the growth kinetics, a complete picture of the gel structural formation should be differentiated into the nucleation and growth of…
A survey of the published literature on undercooled metallic and oxide melts suggests that phase selection during solidification can be categorized as nucleation controlled or growth controlled. Common characteristics governing the phase-selection pathway have been identified for various alloy systems. It is recognize…
Al 2 O 3 reinforced by SiC whiskers (Al 2 O 3 /SiC‐W) was hot‐pressed to investigate the fatigue strength of crack‐healed specimens at high temperature. Semielliptical surface cracks of 100 μm surface length were introduced on each specimen surface. These specimens were crack‐healed at 1300°C for 1 h in air, and stati…