Hydrogen‐Assisted Failure of Alloys X‐750 and 625 Under Slow Strain‐Rate Conditions
This chapter contains sections titled: Introduction Experimental Procedures Results and Discussion Conclusions Acknowledgements
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Growth and silica content of the diatoms Thalassiosira weissflogii and Navicula salinarum at different salinities and enrichments with aluminium
The dependence of the cellular (biogenic) and frustule-associated (mineralized) silica content of the diatoms Navicula salinarum and Thalassiosira weissflogii on salinity and aluminium conditions was studied in order to make it possible to manipulate silicification in vitro and maximize it to levels required for physi…
Studies of the potato microstructure during blanching
The texture changes during the initial phase of blanching of potatoes, carrots and green peas at different blanching times (0–240 s) and temperatures (85 °C, 95 °C, 100 °C) were investigated. The breaking force (N) was determined by compression or Back extrusion tests with an Instron texture tester. Electronmicroscopi…
Modeling of the Rim Effect on Thermal Behavior of High-Burnup UO2Fuel
A model for rim porosity that takes into account the effect of overpressurization on rim pores is proposed for high-burnup UO2 fuel. It is based on the assumption that all the fission gases produced are retained in rim pores, and the threshold pellet average burnup required for the formation of the rim region is 40 MW…
Darstellung und Eigenschaften von Tetra(n-butyl)ammonium-cis-diacidooxophthalocyaninato( 2-)niobaten(V) und -tantalaten(V); Kristallstruktur von (nBu4N)CIS[Nb(F)2Opc2-]
Tetra(n-butyl)ammonium ds-diacidooxophthalocyaninato(2-)niobates(V) and -tantalates(V), ( n Bu 4 N) cis [M(X) 2 Opc 2- ] (M = Nb, Ta; X = F, Cl, NCS, N 3 ), are obtained by the reaction of cis [M(Cl) 3 pc 2- ] or cis [M(Cl}Opc 2- ] (M = Nb, Ta) with the respective tetra(n-butyl)ammonium salt. ( n Bu 4 N) cis [Nb(F) 2…
The Crystal Structure and Magnetic Properties of CuII-NiII Heterodinuclear Complex with N,N′-Bis(2-pyridyl-ethyl)-oxamide Dianion
Abstract A new CuII-NiII heterodinuclear complex [Cu(PEoxd)Ni(bpy)2](ClO4)2·1/2H2O has been synthesized and its structure determined by single crystal X-ray analysis. Crystal data: space group P21/c with a = 9.226(2) Å, b = 30.857(6) Å, c = 14.241(3) Å, and β = 97.36(3)°, V = 4021(2) Å3, Z = 4. Magnetic measurement in…
Mechanism of the Curie-Weiss Law in Ferroelectrics
A simple double-well potential model is established. It shows that the nature of the low-frequency dielectric constant in ferroelectrics is the additional hopping of the off-center ions in multi-site potential. The co-operative effect causes the fact that the Curie-Weiss law is obeyed. The mechanism of the molecular f…
Thermoluminescence of LiF Thin Films
The TL dosimetric properties of the LiF thin films produced on aluminium and stainless steel substrates has been investigated. The influence of some deposition parameters and thermal annealing on the film TL response was studied. The films were irradiated with a 60Co source with doses from 0.2 to 100 Gy. The films' TL…
Nucleation of nanocracks by a quasicleavage process in a dislocation-free zone
The initiation and propagation of nanometre-scale cracks has been investigated in detail using dislocation modelling and in situ transmission electron microscopy (TEM) observations for the intermetallic compound Fe3Al under mode I loading. A discrete dislocation model is proposed to assess quasistatic equilibrium, emi…
Space Charge Polarization by Ions in a Liquid Crystal Material
The complex dielectric constant of a liquid crystal material, 4-cyano-4′-alkyl-biphenyl (5CB), in a low frequency region was measured by taking the thickness of a specimen as parameter. The results were analyzed by introducing an equivalent circuit of a novel concept by taking two kinds of contributions into account:…
Determination of Nonlinear Hyperpolarizability of Bent-Shaped Molecules using Hyper-Rayleigh Scattering
The first-order hyperpolarizability β was determined for bent-shaped molecules P-8-PIMB and P-8-O-PIMB using the Hyper Rayleigh scattering method. βs of these materials were found to be relatively large, about 30×10−30 esu. These results are consistent with the second-harmonic generation experiments performed in their…
Coarsening of a three-dimensional reconstructed foam under Surface Evolver
It is well known that the software Surface Evolver (SE) models the geometry of minimal surface area structures such as a foam. Here we have modelled with SE the gas-diffusion phenomenon responsible for the coarsening of liquid foams. We took as an initial condition, a real reconstructed foam obtained by optical tomogr…
Superelasticity and Shape Memory Effect in Copper Base Alloys
Among the copper base shape memory alloys the most popular are CuZnAl alloys which however show several features like: tendency to stabilisation, limitation of the effect to low temperatures, lattice defects multiplication after numerous cycling and low decomposition temperatures. This defines the directions of invest…
Darstellung und Kristallstruktur von Hexacaesium-hexatelluridodigermanat( III) (Cs6Ge2Te6)
The new compound hexacaesium hexatellurido digermanate(III), Cs 6 Ge 2 Te 6 , has been prepared by reacting the elements in a stoichiometric ratio at 923 K in an evacuated silica glass tube. The title compound crystallizes as black columns and is isostructural to K 6 G e 2 Te 6 (C2/c, a = 17.027(2), b = 14.237(1), c =…
Anomalous Electric Conductivity in Amphiphilic Smectic Liquid Crystals with Terminal Diol-Groups
Conductivity measurements on a smectic liquid crystal with terminal diol-groups are reported. The average conductivity in the liquid crystalline state exceeds the conductivity of the isotropic melt by a factor of 2. This strongly unusual behaviour supports the assumption of fast protonic conductivity in smectic diols,…
Mechanism of exciplex formation between Cu-porphyrin and calf-thymus DNA as revealed by saturation resonance Raman spectroscopy
The excited-state complex (exciplex) formation that results from the photoinduced interaction of water-soluble cationic copper(II) 5,10,15,20-tetrakis[4-(N-methylpyridyl)]porphyrin [Cu(TMpy-P4)] with calf-thymus DNA has been studied in detail by resonance Raman (RR) spectroscopy using both ∼10 ns and ∼50 ps laser puls…
Raman spectroscopic study of uridine nucleotides: structural information and conformational features
Raman spectra of the sodium salts of uridine and deoxyuridine monophosphoric acid, Na2(3′-UMP)·4H2O, Na2(5-UMP)·7H2O and Na2(5′-dUMP)·5H2O, and the cadmium salt, [Cd(5′-UMP)(H2O)2]·2H2O, were examined. Several spectral differences were observed owing to nucleoside conformational differences in the uridine residue. The…
Determination of Stability Constants of Metal Complexes by Capillary Electrophoresis
Abstract The stability constants of several divalent first row transition and trivalent lanthanide metal complexes were determined by capillary electrophoresis (CE) methods. Four different approaches, i.e. direct formation, ligand exchange, metal exchange and metal‐ligand double exchange were developed. To verify if t…
Polymerization of lactams, 94. Formation of cyclic oligomers in anionic polymerization of 6-hexanelactam
HPLC analysis of the methanol-extractable fractions of polymers was used to study the formation of cyclic oligomers during the non-activated anionic polymerization of 6-hexanelactam initiated by sodium or magnesium salt of 6-hexanelactam and ethylmagnesium bromide at 190°C. It was demonstrated that the nature of the c…
A Combined Method Based on Rubbing and UV-Irradiation for Preparing Stable Alignment-Layers with High Pretilt Angles
A novel two-step method combining rubbing and UV-irradiation based on ladderlike polysilsesquioxanes (LPS) containing cinnamate and azobenzene side chains was developed to obtain alignment layers which features a high surface pretilt angle and good stability. At the first step, a low pretilt angle of 1–3° was generate…