Electron spectroscopic investigation of polymers and glasses
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Crystal structure of Ba2Li2/3Ti16/3O13
Single crystals of Ba2Li2/3Ti16/3O13 have been isolated and its crystal structure solved from X-ray diffraction data. The structure is similar to that of Ba2Ti6O13and Na2Ti6O13 [monoclinic, space group C2/m (no.12), a=15.171(13), b=3.8992(18), c=9.106(4) Å, β=98.64(6)°, Z=2], but one of the three independent octahedra…
Spectroscopic properties of nematic discotic phenylethynylbenzene derivatives: Symmetry effects
The spectroscopic properties of two phenylethynylbenzene derivatives capable of forming nematic discotic (N D ) liquid crystals are studied in solution and in their N D phase. Their electronic absorption spectra are analysed with the help of fluorescence anisotropy measurements and on the basis of a previous theoretic…
Mobile Equilibrium Method for Determining Composition and Stability Constant of Coordination Compounds of the Form M_mR_n
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Crystal structure of bis(tetraethylammonium) bis[4,5-disulfanyl-1,3-dithiol-2-onato(2−)]nickelate(II) and spectroscopic and electrical properties of related oxidized complexes
Bis(4,5-disulfanyl-1,3-dithiol-2-onato)nickelate anion complexes [Ni(C 3 S 4 O) 2 ] 2- were prepared. A single- crystal structure analysis has been performed for the bis(tetraethylammonium) salt 1: orthorhombic, space group I4(1)acd, Z = 8, a = b = 19.605(3), c = 16.217(5) Å. Full-matrix least-squares refinement based…
Studies of chemical hardness and chemical potential on isomers and hardness profiles of hydrogen-bonded systems
In the present investigation, chemical hardness and electronic chemical potential for isomers of different molecules were studied by taking into account the principle of maximum hardness. Different isomers of the molecules, XC(O)OX (X=F, Cl), C2H3NO, C2H2, and HCNC, were considered for the above investigation. In most…
Thermal Evolution Spectrum of Hydrogen from Low Carbon Steel Charged by Cathodic Polarization
The introduction of large amounts of hydrogen into low-carbon steel specimens by cathodic polarization produces hydrogen damage such as blisters, microcracks and dislocations. Hydrogen exists in the specimens as atoms dissolved in the iron lattice, as atoms trapped at lattice defects such as dislocations, and as gas p…
Production of Brominated Tiacumicin Derivatives.
Several novel tiacumicin derivatives containing bromine have been produced by the addition of inorganic bromine to the fermentation broth of Dactylosporangium aurantiacum subsp. hamdenensis. Structures were elucidated employing mass spectrometry and NMR spectroscopy. Antibacterial activity of the bromotiacumicins is c…
Solution of Low Frequency Complex Fields in Polluted Insulators by Means of the Finite Element Method
A method to calculate the low frequency complex electric field in polluted insulators is proposed. The method is based on a quasi-static approximation which permits the decoupling of Maxwell’s equations. The method is implemented numerically through the finite element technique by defining a complex functional.
Long Range Attraction in Water Vapor. Capillary Forces Relevant to “Polywater”
A long range attractive force occurs between freshly molten glass surfaces in water vapor. The attraction extends to distances of micrometers. The effect is more pronounced for low melting glasses with a high soda content. It is due to dissolution of the silica matrix components in vapor condensate which forms thick f…
Environmental Issues and Recycling. The Improvement of Soft Clayey Soil Utilizing Reducing Slag Produced from Electric Arc Furnace.
Although the slag, which is secondary product of steel production, has become to be utilized in many ways, the ratio of utilizing reducing slag produced from electric arc furnace is still low because of its swelling character, for instance. To utilize reducing slag produced from electric arc furnace for the improvemen…
On the systematics of phase equilibria in complex magnesium-rare earth systems: Gd-Y-Mg system
General properties of magnesium alloys with one or two different rare earth metals are briefly summarized and discussed. The regular trends observed in the intermediate phase formation are used to predict the characteristics of the room temperature isothermal section of the Gd-Y-Mg system. The partial experimental sec…
Evaluation Of Spherical Crystallization As A Particle Size Enlargement Technique For Aspirin
Spherical crystallization of asprin by solvent change methods was carried out in a crystallization system composed of acid buffer (pH 2.5), methanol and chloroform. The agglomerates contained salicylic acid less than the I.P. limits prescribed. Agglomeration process significantly improved the flow properties of the dr…
Modeling of Matrix Failure in Ceramic Matrix Composites
This paper investigates failure criteria used in modeling matrix failure in unidirectional and cross-ply laminates of ceramic matrix composites. In particular, the critical matrix strain energy (CMSE) criterion, as recently introduced by the authors, is examined in detail. In principle, a failure criterion, such as CM…
Heat treatment characteristics and mechanical properties of superlight Mg-Li-Al alloys.
Mg–17~21 mass%Li–7.2~12.4 mass%Al ternary alloys were melted in order to improve the specific strength, and their heat treatment characteristics and tensile properties were investigated. Specific gravity of investigated alloys is in the range between 1.20 and 1.34, which is lower than that of the conventional Mg–Li al…
Photo- and thermo-chromism of a ruthenium(II) complex and viologen-containing polymer film
A ruthenium(II) complex and a viologen-containing partially quaternized poly(1-vinylimidazole) film demonstrates both photochromism and thermochromism as a result of photosensitized and thermosensitized charge separations.
(BEDT-TTF)(F1TCNQ) and (BEDT-TTF)(F2TCNQ)x(TCNQ)1− x (x ca. 0.5): all-organic metals down to 2 K
Crystal structures and solid-state properties are reported for all-organic metals, (ET)(F1) and (ET)(F2) x (TCNQ) 1-x (x ca. 0.5), which are isostructural with each other and preserve metallic states down to 2 K.
Synthesis and crystal structure of zirconium tungstate ZrW2O7(OH,Cl)2·2H2 O
ZrW 2 O 7 (OH,Cl) 2 ·2H 2 O has been synthesised by refluxing, followed by hydrothermal crystallisation of amorphous zirconium tungstate gels in 1–8 m HCl. It is known that the amorphous Zr tungstate can be used as a gel-generator for production of the 188 Re medical radioisotope. The structure of ZrW 2 O 7 (OH,Cl) 2…
Long-term aging of Sm/sub 2/(Co,Fe,Cu,Zr)/sub 17/ permanent magnets at 300 and 400°C
Long-term aging experiments were carried out for Sm/sub 2/(Co,Fe,Cu,Zr)/sub 17/ permanent magnets at 300 and 400/spl deg/C and both traditional and application-oriented characterizations were performed. Results of application-oriented characterizations show that the maximum energy product of the magnet at 300/spl deg/…
Structural Change in Phosphorus-Bearing Dicalcium Silicates
Structures of (Ca2-x/2_??_x/2)(Si1-xPx)O4 crystals were examined as a function of x ranging from 0.03 to 0.40. All of the samples were heated at the stable temperature region of the α-phase and then quenched in water. The phase constitution at ambient temperature was classified into three categories according to the f…