Materials Literature
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The effect of Cu and Zr on the microstructure and coercivity of Sm(CobalFe0.1CuyZrx)8.5 magnets has been studied using magnetometry and transmission electron microscopy. For Zr-free samples, when y=0.088, a cellular microstructure is not formed. Instead a rod-like 1:5 phase is observed, distributed in the 2:17 matrix…
1 More than 200 known species of Microturbellaria occur in running waters world-wide but discovery of many more is likely. Their population density varies greatly as a function of substratum, productivity, phenology and hydrology. The density may exceed 7 000 individuals m-2. The number of species in a single small sa…
MnZn ferrites with different composition have been synthesized by soft chemistry routes using oxalate precursors with the partial replacement of water by acetone as the solvent. Toroids were sintered at 1250 °C for 3 h in O2/N2 atmosphere. Sintering conditions significantly changed macroscopic characteristics as densi…
An analytic expression is given for the ballistic demagnetizing factors, D′, of the general rectangular prism, in which the field is averaged over the middle cross section of the prism, and for the “side” demagnetizing factor, D″, in which the averaging is over the edges of the prism. The demagnetizing fields are comp…
The influence of 200 keV electrons on the characteristic 7eV π—π∗ peak in polystyrene was investigated using electron energy-loss spectroscopy (EELS) in a scanning transmission electron microscope. π bond degradation is proportional to the total radiative dose. There is an apparent dependence on dose rate such that at…
An all solid inorganic thin film electrochromic display with the complementary structure of /ITO/WO/sub 3//LiNbO/sub 3//NiO/ITO/ was fabricated. The layers of the display were all prepared by reactive magnetron sputtering. Electrochromic property measurements were performed on each active layer as well as on the assem…
Magnetic properties of the intergranular phase in the bcc-Fe/NdFeB nanocomposite alloys containing Nb and Co were investigated with Mössbauer spectroscopy. The alloys were prepared with melt-spinning and post-annealing method. It is revealed that the intergranular phase is not amorphous as considered so far and consis…
The effect of changes in fiber structure on the mechanical properties of nonwoven composite with different punching densities was studied through the testing of tensile, bending, impact, compression after impact, fatigue, friction/wear and mode-I interlaminar fracture properties. The tensile strength and mode-I interl…
The feasibility of EVA/LLDPE films containing 1, 2 and 5% (w/w) K-sorbate to inhibit microbial growth and as a consequence prolong shelf-life of foods was investigated. Based on weight loss experiments it was shown that K-sorbate is very suitable for incorporation in LLDPE because of its heat stability during extrusio…
This paper presents the results of measurements of the principal electric permittivities ε ∥*(T, ω and ε⊥*(T, ω) and the viscosity for 4-(trans-4-n-hexylcyclohexyl)isothiocyanatobenzene (C6H13-CyHx-Bz-N=C=S, 6CHBT). In the nematic phase, the Miesowicz η2 viscosity coefficient was measured in a sample oriented due to t…
Abstract A liquid steadily fed onto a thin wire vertically held in a gas stream may flow down the wire, taking the form of a “string of beads,” which is a composite of teardrop‐shaped beads regularly aligned on the wire and thin cylindrical films each coating the portion of the wire between two neighboring beads. The…
We used an rf magnetron reactive sputtering method to prepare SrMoO3 thin film on a silica glass substrate and evaluated its optical properties. The reflectivity of the blue-colored film showed a cutoff due to plasmon at ∼1.7 eV. From a Kramers–Kronig analysis of the reflectivity, the spectral dependence of dielectric…
The effect of monovalent cation addition on the γ‐Al 2 O 3 ‐to‐α‐Al 2 O 3 phase transition was investigated by differential thermal analysis, powder X‐ray diffractometry, and specific‐surface‐area measurements. The cations Li + , Na + , Ag + , K + , Rb + , and Cs + were added by an impregnation method, using the appro…
A two-dimensional, lattice-Monte Carlo approach, based upon the energy minimization of an ensemble of electric dipoles, was developed to simulate ferroelectric domain behavior. The model utilizes a Hamiltonian for the total energy based upon electrostatic terms involving dipole–dipole interactions, local polarization…
Titanium diboride can be produced by ball‐milling a mixture of TiO 2 , B 2 O 3 , and Mg metal for between 10 and 15 h. The reaction was found to be completed during the milling with no evidence of residual Mg. The unwanted phase, MgO, was readily removed by leaching in acid. The leached powder obtained after 15 h mill…
The three-dimensional crystal structure of Serratia marcescens endonuclease has been refined at 1.1 A resolution to an R factor of 12.9% and an R(free) of 15.6% with the use of anisotropic temperature factors. The model contains 3694 non-H atoms, 715 water molecules, four sulfate ions and two Mg(2+)-binding sites at t…
Lorentz microscopy combined with conventional transmission electron microscopy were used to image the magnetic domains and microstructures of sintered Sm(CobalCuxFe0.06Zr0.03)z (0.088⩽x⩽0.128; 5.8⩽z⩽7.2) permanent magnets which were specifically designed for high temperature applications. The microstructural data were…
The mineralogical and chemical characteristics of saprolites and soils developed from granulitic, monzonitic, and charnockitic gneisses and mylonites of the Blue Ridge Mountains and western Piedmont foothills of central Virginia, were studied. Micromorphological, x‐ray diffraction (XRD), scanning electron microscopy (…
ZrO 2 powder is prepared by low‐temperature vapor‐phase hydrolysis of ZrCl 4 . TG‐DTA, XRD, Raman, BET, and TEM methods are used to investigate the particle size, phase composition, and agglomeration before and after heat treatment. The results show that the as‐prepared ZrO 2 powder is characterized by large surface a…
The decolorisation of reactive dyeing wastewater with ultraviolet radiation and ultrasonic vibration in the presence of hydrogen peroxide was investigated by a batch operation system. Kinetic studies of the reactive dye were conducted on the effects of pH and peroxide dosage, and the performance of ultrasonic vibratio…