Materials Literature
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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…
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.
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…
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…
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…
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…
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…
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…
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.
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.
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 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/…
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…
Using the embedded atom method interatomic potential, all Σ < 50 tilt boundaries for hcp Ti with [0001] orientation are calculated by the method of molecular statics. Based on the atomic positions analysis, the structural units of dislocation cores are indicated. It is found that the atoms at the interfaces tend to fo…
[V 14 O 36 F 4 ] 8- polyanions are built up from two trimers of three edge-sharing VO 5 F octahedra, two dimers of two square pyramids related by their basal plane, two VO 4 tetrahedra and two VO 4 F trigonal bipyramids; between them are intercalated water molecules and diprotonated amines which stabilize the structur…
The spinning of core-spun yarn on the ring frame is a technique used to upgrade the cotton yarn properties. In a core-spun yarn, a filament is covered by a staple fibre. In the current paper the structural and mechanical properties of core-spun yarns produced with a 2.2 tex monofilament core and a cotton wrap on a mod…
Water-insoluble porphyrins dissolve in aqueous solutions of amphiphilic polymers to give systems which mimic the action of peroxidase enzymes.
Colloidal suspensions of charge-stabilized polystyrene latex spheres in near-critical mixtures of 2,6-lutidine and water aggregate reversibly on the side of the coexistence curve rich in the nonpreferred liquid. We have used static light scattering and a Zimm analysis to determine the second virial coefficient ${\math…
Two dithiadiazolyl radicals of formula [F 2 C 6 H 3 CNSSN] ˙ were prepared and characterised by X-ray crystallography; in the solid state the 2′,3′-difluoro isomer forms discrete twisted dimers through a spin-paired singly occupied–singly occupied molecular orbital interaction with an intra-dimer S · · · S distance of…
Abstract Three novel unsymmetrical vanadyl dodecakis(2,2,2‐trifluoroethoxy)phthalocyaninates with nitro, amino or with no substitution were synthesized by a statistical condensation of 3,4,5,6‐tetrakis(2,2,2‐trifluoroethoxy)phthalonitrile with 4‐nitro, 4‐amino or 4‐unsubstituted phthalonitrile, and separated by common…