PAUTOVITE, CsFe2S3, A NEW MINERAL SPECIES FROM THE LOVOZERO ALKALINE COMPLEX, KOLA PENINSULA, RUSSIA
Pautovite, the cesium-dominant analogue of rasvumite and picotpaulite, is a new mineral species found in the Palitra peralka-
Materials Literature
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Development of EBC for Silicon Nitride
Various coating methods of EBC layer for silicon nitride were discussed. High density EBC layer was successfully coated by different techniques such as sputtering, sol-gel and reaction sintering methods. Water vapor corrosion and recession mechanisms of Lu2Si2O7 which is a potential material for EBC were discussed. Th…
Liquid Crystal Digital Beam Steering Device Based on Decoupled Birefringent Deflector and Polarization Rotator
We describe digital beam deflectors (DBDs) based on liquid crystals. Each stage of the device comprises polarization rotator and birefringent prism deflector. We used prisms made of the uniaxial smectic A (SmA) liquid crystal and a solid yttrium orthovanadate crystal. SmA prisms have high birefringence and can be cons…
Theoretical nonlinear optics equivalence between mesoionic and polyenic bridges in push-pull compounds
In this work we report a semiempirical investigation with the purpose of establishing an equivalence in terms of the value of the first static hyperpolarizability, beta(0), of push-pull compounds of the type electron-acceptor(A) - bridge - electron-donor(D), either formed by polyenic bridges or by mesoionic bridges, k…
Vitamins: Potential inhibitors for nickel in acidic media
Corrosion of Ni in 1N HNO 3 has been investigated in the presence of Vitamins B 1 , B 6 and C. Galvanostatic study carried out at a temperature range of 308 K to 328 K revealed a very high inhibition efficiency of these additives. The I% varied in the range of 99·1–99·7% for 10 −2 M concentration of Vitamin B 1 , 43·7…
Alumina/Alumina and Alumina‐Zirconia/Alumina‐Zirconia Joints Through Glass Interlayers, Microstructure, Mechanical Properties and Residual Stresses
As alternative to traditional joining methods, Ca‐Al silicate glasses were used to self‐bond alumina and alumina‐zirconia ceramics under different processing conditions. Microstructures, mechanical properties and residual stress studies have shown glassy interlayer characteristics to be correlated with the chemistry o…
Switching Processes and Formation of the Stable Artificial Domain Structure in Ferroelectric LaBGeO5
The processes of polarization switching in LaBGeO 5 (LBGO) crystals are studied in details for the triangle and pulse electric field in the wide temperature range from room temperature (RT) to Tc = 530°C. It is revealed that the temperature dependence of a coercive field (f = 0.1 Hz) has an exponential form and this f…
Investigation on Mechanical Compatibility Matching for Biomedical Titanium Alloys
The effects of alloying elements such as Mo, Sn, Zr, Nb, deforming-rate, solid solution and aging treatment on mechanical property and microstructure of near βtype biomedical Ti alloys based on Ti-Nb-Zr system were studied. The Influential factors and their solution were discussed to keep matching of strength, elastic…
Photochromic Dynamics of Salicylidene Aniline in Solid State by Using Femtosecond Transient Absorption Spectroscopy
This paper reports the dynamics of the photochromic reaction of crystalline N-(3,5-di-tert-butylsalicyliden)-4-aminopyridine which can be applied for nonlinear optical photoswitches. The transient absorption spectra of the microcrystalline powder were measured by femtosecond diffuse reflectance spectroscopy and compar…
Mechanical properties of N,N,N-trimethylchitosan chloride films
Films of chitosan and N,N,N-trimethylchitosan were cast from aqueous solutions. Chitosan was dissolved in 1% acetic acid while deionized water was the solvent for N,N,N-trimethylchitosan chloride. The resulting films presented different mechanical behaviors as evaluated by DMTA. The film of chitosan exhibited an elast…
Mesogenic Schiff's base ester with chloroethyl tail
Two new mesogenic homologous series of Schiff's base ester with chloroethyl tail having the following general formula have been synthesized. The molecular structures of the synthesized compounds were characterized by the standard spectroscopic methods and elemental analysis. The mesomorphic behaviour of these new Schi…
Characterization of Maleic Acid/Anhydride Copolymer Films by Low-Rate Dynamic Liquid−Fluid Contact Angle Measurements Using Axisymmetric Drop Shape Analysis
Thin films of alternating maleic acid/anhydride copolymers (poly(octadecene-alt-maleic acid/anhydride), POMA; poly(propene-alt-maleic acid/anhydride), PPMA; poly(styrene-alt-maleic acid/anhydride), PSMA) were studied to unravel the influence of the comonomer characteristics in the backbone on the surface-energetic pro…
Electrical Conductivity of Polymer Composites Filled with Metal
Conductive polymer composites filled with conductive filler particles exhibit a positive temperature coefficient (PTC) effect. It is desirable to develop these composites with a low resistivity at room temperature and a high resistivity after polymer melting. We evaluated the relationships between the PTC properties o…
Synthesis, characterization and fluorescence properties study of meso-tetrakis(1-arylpyrazole-4-yl)porphyrins
Five new meso-tetrakis(1-arylpyrazol-4-yl)porphyrins were synthesized to investigate their fluorescence properties. Preparation of these porphyrins was carried out by cyclization of tetramethoxypropane with substituted phenylhydrazine, followed by formylation to give the corresponding aldehydes, which reacted with pyr…
Preparation of Dense Nanocrystalline Silicon Carbide Ceramics by Sinter Forging in the Presence of a Liquid Phase
Dense SiC materials from ultrafine starting powders may be obtained with very limited grain growth if uniaxial hot pressing with concurrent lateral flow of the sample is applied. This process, termed sinter forging, allows to decouple the kinetics of densification and grain growth owing to the elimination of the large…
Application of genetic algorithms in knitting technology
The paper presents an original software, Knitting Machine Simulator (KMS), developed to design and to optimize a knitting machine's cam profiles. The program applies a genetic algorithm over a real-time knitting machine simulation in order to test the generated cam profiles.
Quantitative Electron Diffraction Data of Amorphous Materials
A method has been developed to obtain quantitative electron diffraction data up to a value of Q = 20 Å −1 of the modulus of the scattering vector. The experiments were performed on a commercially available transmission electron microscope equipped with a so-called omega energy filter. An analytical multiple scattering…
Modeling of magnetostriction in particulate composite materials
By combining a magnetostrictive material with a polymer or a metal, the magnetostrictive composites can have a reasonably large magnetostriction response for various sensor and actuator applications. In this paper, a relatively simple model for studying the magnetostrictively induced deformation behavior of magnetostr…
Wilfoside K1N isolated from Cynanchum wilfordii inhibits angiogenesis and tumor cell invasion
Wilfoside K1N is a polyoxypregnane glycoside isolated from Cynanchum wilfordii (Asclepiadaceae). Polyoxypregnane glycosides are associated with cellular immunity and anti-tumor activity, and increase the cytotoxicity of many anti-cancer drugs showing multidrug resistant activity on tumor cells. In the present study, w…
Corrosion inhibition of pure nickel by some phosphonium compounds in acid medium
The inhibition of corrosion of nickel in H 2 SO 4 solution in presence of some phosphonium inhibitors at different concentrations and temperatures is investigated. The inhibition efficiency increases with increasing inhibitor concentrations. Polarization studies indicate that the compounds used are all mixed inhibitor…