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Interactions Due To Time Harmonic Inclined Load In Micropolar Thermoelastic Medium Possesing Cubic Symmetry Without Energy Dissipation

A study of high-energy milling for the production of sintered PrFeB magnets

Sintered Pr16Fe76B8 magnets have been produced using the hydrogen decrepitation (HD) process and high-energy planetary ball milling. Investigations have been carried out to evaluate the influence of the milling speed and time. The best magnetic properties obtained were Br = (1020 ± 20) mT, µ0iHc = (1420 ± 30) mT and (…

Chemical changes of titanium and titanium dioxide under electron bombardment

The electron induced effect on the first stages of the titanium (Ti0) oxidation and titanium dioxide (Ti4+) chemical reduction processes has been studied by means of Auger electron spectroscopy. Using factor analysis we found that both processes are characterized by the appearance of an intermediate Ti oxidation state…

Magnetic properties of Pr-Fe-Co-B bonded HDDR magnets with alloying additions

Microstructures and magnetic properties of Pr-Fe-Co-B bonded magnets were investigated. The magnets can be represented by the formulae, Pr14Fe63.9Co16B6M 0.1 (M = Ti, V, Cr, Ni, Zr, Nb or Mo), Pr14Fe63.8Co16B6Nb 0.1T0.1 (T/= Al, Si, P, Cu or Ga) and Pr14Fe63.6Co16B6Nb 0.1R0.3 (R = Gd, Tb or Dy). The effects of additio…

Cyclic oxidation resistance of rare earth oxide gel coated Fe-20Cr alloys

Rare earths (RE) have been used to increase high temperature oxidation resistance of chromium dioxide and alumina forming alloys. The RE can be added as elements (or oxides) to the alloys or applied as an oxide coating to the alloy surface. RE oxide gels, obtained by the sol-gel technique, were used to coat Fe-20Cr sp…

High temperature oxidation resistance of rare earth chromite coated Fe-20Cr and Fe-20Cr-4Al alloys

Doped lanthanum chromite has been used in solid oxide fuel cell (SOFC) interconnects. The high costs involved in obtaining dense lanthanum chromite have increased efforts to find suitable metallic materials for interconnects. In this context, the oxidation behavior of lanthanum chromite coated Fe-20Cr and Fe-20Cr-4Al…

Characterization of PVDF/HAP composites for medical applications

Biomaterials (composites and blends) play a major role in the health of modern society. This paper reports on the preparation and characterization of polyvinylidene fluoride (PVDF) and hydroxyapatite (HAP) composites, analyzing the incorporation of HAP in PVDF and investigating their mechanical properties and cytotoxi…

Analysis of Superplastic Deformation of AZ31 Magnesium Alloy

AZ31 is a magnesium alloy possessing good mechanical properties, which makes it particularly attractive for automotive applications. Yet, in order to advance the utilization of this alloy, a broad database of its superplastic behavior is needed. This work presents the results of a comprehensive study on the elevated t…

Photoluminescence from Silicon Quantum Dots in Si Quantum Dots/Amorphous SiC Superlattice

We prepared size-controlled silicon quantum dots superlattices (Si-QDSLs) by thermal annealing of stoichiometric hydrogenated amorphous silicon carbide (a-SiC:H)/silicon-rich hydrogenated amorphous silicon carbide (a-Si 1+ x C:H) multilayers. Transmission electron microscope (TEM) observation revealed that silicon qua…

A Molecule-Based 1:2 Digital Demultiplexer

A trichromophoric molecule consisting of a porphyrin linked to both a dihydropyrene and a dihydroindolizine-type photochrome, in combination with a third harmonic generating crystal, functions as a 1:2 digital demultiplexer with photonic inputs and outputs. Each of the two photochromes may be cycled independently betw…

Influence of Citric Acid on the Properties of Glycerol‐plasticized dry Starch (DTPS) and DTPS/Poly(lactic acid) Blends

Abstract In the presence of citric acid (CA), one‐step extrusion processing is used to prepare poly(lactic acid)/thermoplastic dry starch (PLA/DTPS) blends (50/50, %, w/w) in a single‐screw extruder. The rheological study proves that CA decreases the viscosity of both DTPS and of DTPS/PLA blends. The low viscosity inc…

Synthesis of gold nano-plates by mercaptide thermolysis in poly(vinyl acetate)

Triangular gold nano-plates have been synthesized by thermal decomposition of Au(I) dodecyl-mercaptide (i.e., AuSC12H25) dissolved in poly(vinyl acetate). Such special shape was achieved because of the ability of polymer side-groups (i.e., the acetate groups) to be selectively absorbed on the most acid faces of the gr…

Complexes of heavy metals with nitrogen containing copolymers - electrochemical and physicomechanical properties

Metal complexes were synthesized on the basis of the copolymers of radiation grafted poly-4-vinylpyridine onto polyethene and polytetrafluoroethene. The formation of the complexes was carried out in solutions of the following salts: FeCl3•6H2O, CoCl2•6H2O, VOSO4•5H2O, Na2MoO 4•2H2O and Na2WO4•2H2O. The introduction of…

Microhardness investigation on thin films of virgin and electrically aged pure PVF and isomorphic polyblends of PVF/PVDF

Replacement of conventional materials by polymeric materials (blends/composites) with improved mechanical performance is of immense importance for modern technology. Blending of fluoro polymers can contribute to such synergistic properties. PVDF, as a semi-crystalline fluoro polymer, has been blended with PVF fluoro p…

ROOT-FINDING ALGORITHM FOR UNIVARIATE POLYNOMIALS WITH COEFFICIENTS FROM K[X,Y]

Deterministic polynomial-time root-finding algorithm for univariate polynomials with coefficients from k[x,y] where k is a field of any characteristic is constructed. Our algorithm can be viewed as an extension of the Roth-Ruckenstein's root-finding algorithm to polynomials from k[x,y][T].

REGISTRAR OF KINEMATICAL PARAMETERS OF ELECTRICAL MACHINES WITH SEPARATE ARCHITECTURE OF SYSTEM SOFTWARE

Describing digital measurement device of kinematical parameters of electrical machines of technological equipment. The measurement device was worked out on base of modern microcontroller with realization of principle of separate architecture of system software.

LAW AND POSTMODERNISM'S DISCOURS: THE DUALITY OF EXPLANATION OF THE MODERN SOCIAL WORLD

In clause polemic of the author with philosophy of a postmodernism concerning understanding of a category of the law is stated. Subject of polemic is denying by postmodernists of the social law, or «the great legend» as they name any generalization, called to explain the world acts. The author specifies theoretical de…

DESCISION MAKING ON A COMBINE HARVESTER'S TECHNOLOGICAL ADJUSTMENT ON THE BASIS OF FUZZY LOGIC CONCLUSION

The mechanism of expert system's fuzzy logic conclusion for decision making on technological adjustment of a combine harvester is considered.

ON THE PROGRAM MODULE REALIZATION OF SUDAN DETERMINED DECODER FOR REED-SOLOMON CODES

The program module of Sudan determined list decoder for Reed-Solomon codes is developed. The block diagram and program realization of decoder are constructed. A part of the realization is based on the effective factorization algorithm of Roth-Ruckenstein.

TECHNIQUE OF DEFINITION OF POTENTIALS OF THE ZERO CHARGE OF METALS ON SIZE OF WEAR PROCESS AT POLARIZATION WITH SIMULTANEOUS ULTRASONIC INFLUENCE

The technique of definition of potentials of a zero charge of metals on size of wear process is developed at polarization with simultaneous ultrasonic influence in a regular one-, two-nuclear spirits and glycerin.