Materials Literature
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Synopsis Aromatic nitriles may be trimerized at moderate temperature and pressure with p-toluenesulfonic acid as catalyst. Studies were conducted to establish the effect of the reaction temperature, pressure, time, and catalyst concentration on yield of the trimerized product. Trimerization studies were also conducted…
Rotational hysteresis loss has been measured on small discs of approximately 4% silicon-iron single crystal with
The blending of traditional transformer design practice with the phenomenal speed and logic adaptability of a modem computer has lead to a greater insight into transformer design procedures. This is due in part to the ability of the computer to execute many cumbersome and reiterative calculations in a logical and step…
An equation for predicting the lea strength of ring-spun cotton yarns is evolved by correlating a function of the lea strength, namely. Bogdan's intrinsic-strength parameter, P, with an integrated fibre-quality index, Q, the regression coefficients being allowed to account for the effect of the spinning conditions. Th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structures of cis-bis(pentahaptocyclopentadienyl)tricarbonyl(triphenyl phosphito)diironF. A. Cotton, B. A. Frenz, and A. J. WhiteCite this: Inorg. Chem. 1974, 13, 6, 1407–1411Publication Date (Print):June 1, 1974Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton magnetic resonance studies of ligand-exchange equilibriums for dihalo- and diethoxybis(.beta.-diketonato)titanium(IV) complexesRobert C. Fay and R. Neil. LowryCite this: Inorg. Chem. 1974, 13, 6, 1309–1313Publication Date (Print):June 1, 1974Publication History Publis…
resistance in the higher dose range. Tertiary butanol can almost completely reverse the sensitization determined by Ag+. These results are consistent with the *OH radical theory of sensitization previously offered from this laboratory. In 02-saturated suspensions, Ag2S04 produces an over effect that is dependent on co…
Direct observations of grain-boundary ledges have been made in a number of metals and alloys by transmission electron microscopy. Grain-boundary ledges have been observed to be sources of dislocations, and emitted dislocations take on the appearance of pileups. It is suggested that, because of the dearth of observatio…
The spin density distribution in the ferromagnetic alloy FeB has been determined from neutron diffraction measurements. Features are: an aspherical distribution of magnetization density around the iron atoms. Particular features found in the study are a moment of 0.95 mu B associated with the iron atoms, an interactio…
Heat-capacity and entropy changes at the metal-insulator transitions have been measured on ${\mathrm{Ti}}_{4}$${\mathrm{O}}_{7}$ single crystals. The 130-K transition is related to a disordering of the ${\mathrm{Ti}}^{3+}$ and ${\mathrm{Ti}}^{4+}$ chains at the unit cell level. ${\mathrm{Ti}}^{3+}$ pairing occurs in t…
The strain rate dependence on dynamic crack propagation in viscoelastic solids was experimentally verified for PMMA by the velocity gauge method and fracture surface observation. It was found that the dependence was mainly due to the viscous term effect, and this was supported by the observation of deviation of the st…
The most common type of joint in large single-phase transformer cores is the 45° mitred overlap, but also important in smaller cores is the simpler butt and lap joint. The localized power loss and flux distribution has been measured in these two types of joint built from the same size and type of gain-oriented silicon…
High precision measurements of positron lifetimes in indium have been carried out at five temperatures in the range 83K to 405K. Constraint free analyses of the results clearly establish the multicomponent nature of the lifetime spectra and the fitness of the 'no escape' models of positron defect trapping phenomena. T…
Open-end, twistless, and ring yarns made from cotton and spun to different twists were knitted into single-jersey fabrics to assess their performance. Further tests at a given twist level for a range of polyester/cotton yarns were also included. A variety of yarn and fabric relaxations were used, and it was evident th…
Mathematical models for the monolith converter are developed and applied to the oxidation of carbon monoxide in automobile exhausts. The converter consists of an array of ducts with catalyst coating the walls. The exhaust gas flows axially through the ducts in laminar flow. Two models for this type of converter are pr…
An extensive study of the configurations 4 f N (5 d + 6 s ), using the methods of Racah, which included the configuration interaction for these two configurations and effective electrostatic parameters for the 4 f -5 d interaction leads to an improved agreement between observed and calculated energies for seven spectr…
A newly discovered diatom species, Skeletonema menzelii, has been isolated from the Western Sargasso Sea. In the light microscope it is distinguished from the closely related species S. costatum and S. tropicum by generally smaller cell size, fragility of the shells, shorter chain length, and irregular spacing of the…
Abstract The phosphorescence from the nylon polymers 6, 66, 11, and 12 has been studied from the aspects of excitation and emission wavelength location and of emission lifetime. In contrast to the other nylons, the 66 polymer exhibits two distinct phosphorescence bands, both of which are sensitive to thermal and photo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, chemistry, and structure of the lithium salt of the octamethyldimolybdate(II) ionF. A. Cotton, J. M. Troup, T. R. Webb, D. H. Williamson, and G. WilkinsonCite this: J. Am. Chem. Soc. 1974, 96, 12, 3824–3828Publication Date (Print):June 1, 1974Publication History…
The low power loss and high power threshold properties have been measured on a number of candidate ferrite phase-shifting materials. The low power loss is characterized by /spl mu//sub 0/'', the imaginary part of the diagonal component of the permeability tensor for the completely demagnetized state. /spl mu/sub 0/''…