Materials Literature
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Polygalacturonic acid, calcium polygalacturonate, and samples of two cotton varieties are subjected to elevated temperatures for varying increments of time. The galacturonic acid residues of the heat-treated samples are quantified by digestion with pectinase along with EDTA, and the resultant solutions are analyzed by…
This paper reports on measurements of the acoustic, magnetic, and electrical properties and on an x-ray microprobe analysis of a La 0.825 Sr 0.175 MnO 3 single-crystal sample. The acoustic studies were made with a pulsed acoustic spectrometer operating on a 770-MHz carrier. The studies revealed anomalies in the dampin…
Abstract The basic principles of small-angle neutron scattering and the two-phase model, frequently used for the interpretation of scattering data, are presented. Some studies on phase separation in alloy single crystals serve to illustrate the possibilities of the method. Small-angle neutron scattering of Ni-rich Ni—…
In many applications of polymers, impact performance is a primary concern. Impact tests experimentally performed on molding prototypes yield useful data for a particular structural and impact loading case. But, it is generally not practical in terms of time and cost to experimentally characterize the effects of a wide…
One of the gaps of the modern solar-terrestrial physics is an absence of the permanent space monitoring of the soft X-ray and extreme ultraviolet radiation from the full disk of Sun. The permanent Solar Patrol at the main part of the ionizing radiation spectra 0.8-115 (119) nm does not exist. These measurements are ve…
The objective of this work was to examine the calcium concentration in the shells of naturally infected individuals of Lymnaea stagnalis. Calcium concentration in the water of lakes and in snail shells was examined by the EDTA method. Calcium concentration in the shells of infected snails was found to be higher than t…
Ferroelectric properties of ion-cosubstituted BIT thin films, (Bi4.00 − yLny)4-δ (Ti3.00-xXx)3O12 (BLnTX), with various lanthanoid (Ln: e.g., La3+, Nd3+, Pr3+, Sm3+) and higher-valent ions (X: e.g., V5+, Nb5+, Ta5+, W6+) were investigated to determine the optimum condition of the ion-cosubstitution. Ion-substituted BI…
The pyrolysis of polymethylsilane (PMS) in an argon gas environment with a flow rate of 1 L/min was investigated as a standard pyrolytic process, and the investigation showed SiSi network formation at 573 K. Subsequently, various condensed PMS resins were prepared by adjusting pre‐heat‐treatment or reflux conditions i…
Abstract A tailor‐made autoclave setup for simultaneous acoustic irradiation and hydrogenation was used in the hydrogenation of fatty acids and carbohydrates. The aim was not to perform actual sonochemistry but to retard deactivation of the catalyst by means of acoustic irradiation. The catalyst used was a Raney nicke…
Achiral multi-block liquid crystals are not expected to form polar domains. Recently, however, films of nanoaggregates formed by multi-block rodcoil molecules were identified as the first example of achiral single-component materials with macroscopic polar properties. By solving an Ising-like model with dipolar and as…
Large area volume phase holographic (VPH) gratings have been made for use in spectrographs attached to large telescopes and for scanning LIDAR systems. Examples of the transmitted wavefronts, the spectral efficiency measurements and other parameters such as uniformity, scatter, absorption and Q have been gathered and…
Serine hydroxymethyltransferase (SHMT), a pyridoxal 5'-phosphate (PLP)-dependent enzyme, catalyses the transfer of the hydroxymethyl group from serine to tetrahydrofolate to yield glycine and N (5), N (10)-methylenetetrahydrofolate. An analysis of the known SHMT sequences indicated that several amino acid residues wer…
A memory function equation and scaling relationships were used for the physical interpretation of the Cole-Cole exponent. The correspondence between the relaxation time, the geometrical properties, the self-diffusion coefficient and the Cole-Cole exponent was established. Using this approach the dielectric relaxation…
A series of Z type hexaferrite samples with composition Ba3CoxZn2 -xFe24O41 (x varying from 0·0 to 2·0 in steps of 0·4) were prepared by a citrate sol-gel process. Samples were characterised by TG-DSC, X-ray diffraction, and scanning electron microscopy. Complex permittivity and permeability, and dielectric and magnet…
The crystal structure of cafetite, ideally Ca[Ti 2 O 5 ](H 2 O), (monoclinic, P2 1 /n, a = 4.9436(15), b = 12.109(4), c = 15.911(5) Å, b = 98.937(5)°, V = 940.9(5) Å 3 , Z = 8) has been solved by direct methods and refined to R 1 = 0.057 using X-ray diffraction data collected from a crystal pseudo-merohedrally twinned…
Pb(Zr,Ti)O3 (PZT) thin films were deposited onto Pt/TiO2/SiO2/Si substrates with different-types of TiO2 layers by liquid delivery MOCVD at 550°C. Three kinds of TiO2 adhesion layers were examined: 200 oriented TiO2 with rutile structure, 103 oriented TiO2 with anatase structure and randomly oriented TiO2 which consis…
Benchmark solutions in Computational Fluid Dynamics are necessary for testing and for the verification of newly developed algorithms and codes. For flows involving heat transfer coupled to solid-liquid phase change and convection in the melt, such benchmark solutions do not exist. A set of benchmark problems has recen…
Abstract The urea method was applied to deposit a nickel–calcium catalyst inside porous filter discs to develop a gas cleaning technique involving the combined removal of tars and particles from hot biomass gasification gas. Some catalytic filter discs were tested in typical filtration conditions for the decomposition…
Ce 0.8 Gd 0.2 O 1.9 solid ionic conductors have been prepared by techniques involving polymeric precursors: the Pechini and the amorphous citrate techniques. The aim of this work is to determine among these techniques the most suitable to obtain solid solutions with high chemical homogeneity and high sinterability. Th…
This paper proposes a new membrane stress based model to predict the draping of woven fabrics over irregular surfaces. It has been well established that pure shear is the main mechanism allowing a woven fabric to conform to double curvature shapes. Although the kinematic drape models developed on this principle serve…