Materials Literature
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The calculation of matrix elements involving nonorthogonal orbitals is speeded up by recognizing the orthogonalities between orbitals, leading to generalized Slater rules. The block structure present in the overlap matrix makes an efficient evaluation of its cofactors possible. These cofactors are calculated per subbl…
Frozen biological specimens in t-butyl alcohol were examined under a low-vacuum environment in a "wet SEM" or "variable pressure SEM (scanning electron microscope)" equipped with a cooling stage and highly sensitive backscattered detector of the YAG type. After fixation with glutaraldehyde and osmium tetroxide, rat ti…
(1998). Surface hardening of iron-carbon alloys by arc quenching. Welding International: Vol. 12, No. 4, pp. 326-328.
The effect of the incorporation of poly(dimethyl siloxane) (PDMS) segments into a poly[N,N'-(p,p'-oxydiphenylene) pyromellitimide] (PMDA-ODA) polyimide backbone on the adhesion between PMDA-ODA polyimide and glass was investigated using X-ray photoelectron spectroscopy (XPS), infrared (IR) spectroscopy, contact angle…
The design, synthesis, structural and physical characterization and engineering, and the study of the electrical conductivity and the nonlinear optical properties of phthalocyanines and molecular substances related to them, such as subphthalocyanines, hemiporphyrazines and triazolephthalocyanines were reviewed.
Problems associated with the contamination of distinct diatom communities by live or dead frustules (valves) from adjacent communities are discussed.The importance of the recog) tion and discrete sampling of the numerous microhabitats in both freshwater and marine systems is stressed, Special comments are made concern…
Lithium ferrite nanocrystals were synthesized using polyethylene glycol as a protecting agent for colloidal particles via the sol-gel process. The microwave absorbing properties of lithium ferrite nanocrystals were investigated on the frequency range of 8.0-12.4 GHz using an HP-8410B network analyzer. The results show…
Eu3+ containing 3Na2O⋅42B2O3⋅55SiO2 (mol%) glass was isothermally heat-treated for phase separation. The photoluminescence (PL) behavior of Eu3+ was investigated. It was found that PL intensity of 5D0→7F2 transition of Eu3+ increases with evolution of phase separation. A maximum 6.5 times increment in the PL intensity…
The effect of addition of ternary elements, mainly In and Pd, on the phase fields of CuPt3 with the L12 type of ordered structure and CuPt with an L11 type of ordered structure in the Cu-Pt system has been investigated and the results compared with the substitution behaviour of the added elements and the electron-atom…
Foamed polymers are future materials with their wide application spheres. They can be used to enhance appearance as insulating structures or to save material costs. This study addresses all of these and concerns a new technology to produce foamed tubes and films. An entire blown film extrusion line was built up to ful…
Scanning electron microscopy and microprobe Auger electron spectroscopy were used for characterizing the morphology and the surface composition of voids in the bulk of icosahedral Al–Pd–Mn single-quasicrystals. The samples were prepared by in-situ cleavage fracture in the ultra-high vacuum. The void images could be ex…
The mechanisms of delamination of an epoxy coated steel system with various substrate non-rinse chromate treatments has been investigated by XPS and TOF-SIMS. First, the chromate surface before epoxy coating was investigated to establish the layer structure produced by the chromate treatments. The pre-treatment layer…
Neutral alkali metal salts of benzhydroxamic acids described in the literature are in fact acid salts; neutral salts rearrange to N,N′-diarylureas under mild conditions.
A stimulated Brillouin scattering phase-conjugate mirror with the organic nonlinear optical crystal deuterated l-arginine phosphate monohydrate has shown a reflectivity of more than 80% at 1064 nm. We demonstrate the correction of a deliberate aberration for a 10-Hz Nd:YAG laser by this crystal.
The excited-state relaxation dynamics and pathways of oxovanadyl(IV) tetraphenylporphyrin (OV IV TPP) have been investigated by nanosecond time-resolved and steady-state emission, transient absorption, and transient resonance Raman spectroscopies. At room temperature, the emission spectrum shows a single broad feature…
Alkaline earth doped lanthanum manganites (La 1-x M x MnO 3+δ , with M=Ca, Sr, Ba...) are attracting materials because of their peculiar properties displayed in giant magnetoresistance and electrocatalytic activity Classical synthesis routes of the material make use of solid state reaction, among suitable precursors,…
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Disk-shaped functionally graded materials of copper/alumina system have been fabricated by spark plasma sintering(SPS process. The graded layer consists of symmetrical compositional transition of Cu/Al2O3/Cu, which allows to achieve high heat conduction, electrical insulation and excellent in-plane electrical conducti…
Description Features the most current information on experimental and analytical research in key areas of composite technology. Leading experts in the field have presented 18 comprehensive, peer-reviewed papers covering the following major categories: Fatigue and Fracture-- 8 papers focus on microstructural effects, d…
The temperature dependent changes of logarithmic decrement δ and Young’s modulus E were measured for continuously cooled Mn74.8Cu19.2Ni4.0Fe2.0 and Mn72.4Cu20.0Ni5.6Fe2.0 (at%) alloys, after solid solution holding at 1173 K. Microstructure of those alloys, cooled to room temperature in different rates, was characteriz…