Materials Literature
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Abstract Neu dargestellt wurden die Oxide RbLiZnO 2 (A) und RbLiZn 2 O 3 (B) in Form farbloser Einkristalle durch Tempern entsprechender Gemenge der binären Oxide. Beide Zincate kristallisieren tetragonal, A: Raumgr. I4/mmm, Z = 2, a = 351,84(4), c = 1153,3(2) pm; B: Raumgr. P4 2 /mnm, Z = 4, a = 1 033,8(1), c = 342,8…
ESR spectra are reported for frozen CH2Cl2/ClCH2CH2Cl solutions of 14 low-spin manganese(II) cations: [(η5-C5H5)Mn(CO)L2]+, L = 1/2 Ph2PCH2CH2PPh2(dppe), 1/2 Me2PCH2CH2PMe2(dmpe), 1/2 Ph2PCH2PPh2(dppm), PMe3, PPh3; [(η5-MeC5H4)Mn(CO)dppe]+; [(η5-6-exo-PhC6H6)Mn(CO)L2]+, L = 1/2 dppe, 1/2 dmpe, PMe3; [(η5-6-exo-PhC6HMe…
Analysis of the various models for the local field shows that most of them give similar Lorenz—Lorentz formulae for nematic liquid crystals. They differ only in the way they define parameters such as the structural anisotropy. Because of the arbitrariness of the model parameters, the structural anisotropy values in th…
The crystal structures of the complexes [Co(OH2)5][Cu(cdta)]·H2O (5), [Zn(OH2)4][Zn(cdta)(OH2)]·4H2O (6), and [Zn0.7Co0.3(OH2)4][Zn0.3Co0.7(cdta)(OH2)]·4H2O (7)(cdta =trans-cyclohexane-1,2-diamine-NNN′N′-tetra-acetate) have been determined by X-ray methods. They crystallize in space groups Pbc21, P21/n, and P21/n resp…
The effect of oxides and oxide glasses on the oxidation of AlN powder and substrate was studied by thermogravimetric analysis, supplemented by XRD, optical microscopy, and EPMA. The oxidation behavior of powder mixtures of AlN and oxides or glass frits in air was dependent on the oxide species. Oxides were divided int…
Water vapor transport through rigid polyurethane and polyisocyanurate foams was investigated using three test methods—two under isothermal conditions and one in the presence of a thermal gradient. All three methods yielded water vapor transmission coefficients of the materials. It is observed that the magnitude of the…
Discussion and closures to above titled paper published October, 1988, 427–436.
Critical conditions to repassivate growing crevice corrosion in terms of electrode potential, ER, temperature, TR, and NaCl concentration, CNacl, R, were determined for metal/metal-crevice of ASTM Grade 12 (G 12 Ti) and Ti-x (=0?2%)Ni-y(=0?0.4%) Mo alloys.G 12 Ti with 0.8%Ni and 0.3% Mo has more noble ER values than c…
The structures of calcium salts of the erbium(III) and neodymium(III) chelates of the calcium-selective octadentate ligand egta4–[H4egta = 3,12-bis(carboxymethyl)-6,9-dioxa-3,12-diazatetradecanedioic acid] have been determined, in order to identify the structural changes that occur in a calcium-selective binding site…
Magnetic measurements, with particular emphasis on finite cylinders of iron in the form of whiskers, are interpreted with regard to magnetostatic effects. Demagnetizing fields are calculated using various degrees of approximation. In the cases considered the magnetostatic effects are dominant over other contributions…
A multiaxial theory of creep deformation for particle-strengthened metal-matrix composites is derived. This derivation is based on the observation that there are two major sources of creep resistance in such a system. The first, or metallurgical effect, arises from the increased difficulty of dislocation motion in the…
Abstract The mechanism of the thermal behaviour of Na‐magadiite at a temperature range from 293–573 K was developed based on X‐ray diffraction, DTA, DTL, Q‐TG, and gravimetric measurements. A structure model (B RANDT et al.) previously proposed was additionally used. It is possible to show that there probably is a con…
The effects of underrib configuration on the flashover voltage of contaminated HVDC (high-voltage direct-current) insulators are analyzed. Mathematical models are developed to characterize the behavior of multiple discharges sustained along a contaminated surface. The effectiveness of the insulator leakage length is i…
Polymeric blends of lignin with ethyl cellulose (EC) and cellulose acetate/butyrate (CAB) were prepared by solution casting from dioxane. Fracture surface analysis by scanning electron microscopy revealed phase separation when the lignin content exceeded 10% for blends with EC and 5% in the CAB system. While this phas…
The mechanical properties of fabric longitudinal extension and compression, shear and bending have an important influence on the performance of fabrics during tailoring and also on the performance of garments during use. Fabrics are overfed or underfed in tailoring during the sewing operations in such a way that longi…
Abstract Quantitative mineral analysis is necessary if highly accurate estimates of mineral types and proportions in a bulk rock are required to evaluate or predict the properties or behavior of that rock. In this chapter, “highly accurate” is defined as within 3% absolute or 10% relative (±10% of the amount of a give…
ABSTRACT A kinetic compensation effect was observed for acid‐catalyzed hydrolysis of a series of disaccharides. Twelve data sets for acid hydrolysis of three disaccharides reported in the literature were analyzed and compensation parameters were determined. The results are well described by following empirical compens…
Abstract This paper provides a summary of four EPRI‐sponsored contracts that studied the physico‐chemical characteristics and thermal and electrical behavior of unaged and service‐aged crosslinked polyethylene (XLPE)—insulated cables, and sections of the insulation obtained from this extruded cable. It has been demons…
The effect of quench rate in terms of the circumferential wheel speed and temperature of the melt when ejected on crystallographic orientation were studied for Nd-Fe-B melt-spun magnets. It was found that the temperature of the melt (T/sub m/) is the dominant parameter affecting the preferred orientation of the tetrag…
—The interfacial reactions of galvanized steel with a poly(vinyl chloride) adhesive formulated with epoxy resin and dicyandiamide have been studied using X-ray photoelectron spectroscopy (XPS). The dicyandiamide was observed to segregate partially to the adhesive/substrate interface. A small amount of amine hydrochlor…