Materials Literature
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ABSTRACT An alternative form, y = An mc e −cn , of the lactation model of Wood, y = An b e −cn , is suggested. The new parameter, m, is the time required to achieve maximum milk yield. The correlations between non-linear parameters are reduced.
Abstract A simple procedure is described for the rapid, quantitative analysis of dicyandiamide in epoxy resins and epoxy resin prepregs. High performance liquid chromatography is used to analyze for dicyandiamide and to investigate the solubility behavior of dicyandiamide and 3‐( p ‐chlorophenyl)‐1,1‐dimethylurea (Mon…
Measurements of the magnetic susceptibility ($\ensuremath{\chi}$) using low-field electron spin resonance over the temperature range $30 \mathrm{mK}<T<300 \mathrm{K}$ are reported for a polycrystalline sample of quinolinium-di-tetracyanoquinodimethanide, as well as over a more limited range in $T$ for two other…
Abstract Copolymers of styrene with vinylphenyl trifluoromethyl carbinol, p ‐vinylphenyl trifluoromethyl carbinol, vinylphenyl hexafluorodimethyl carbinol, and p ‐vinylphenol are conditionally compatible with poly(ethylene oxide), depending on their composition and blending ratios, whereas copolymers of styrene and vi…
The brittle fracture behavior of round-notched poly(methyl methacrylate), poly(vinyl chloride), and polystyrene bars has been studied at varying temperatures and bending rates. Brittle fracture originating from internal crazes occurs in a restricted range of temperature. When the plastic deformation zone at the tip of…
High-resolution x-ray measurements (error \ensuremath{\sim}200-400 ppm) of smectic layer spacing $d$ of six homologs (TB3A-TB8A) of terephthal-bis-($4n$)-butylaniline (TBBA) have been made as a function of temperature. In the smectic-$C$ phase, the exponent of the tilt angle for TB3A and TBBA has a value close to $\fr…
A survey of the instabilities of switching voltage regulators with different types of current-mode controllers (including LC3or constant-hysteresis; MC2or constant-frequency and constant off-time versions) is presented. Apart from the well-known open-loop oscillation of the constant frequency regulator above 50% duty…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmination of .pi.-allylpalladium chloride complexes. A mechanistic studyBjorn Åkermark, Gunilla Åkermark, Louis S. Hegedus, and Krister ZetterbergCite this: J. Am. Chem. Soc. 1981, 103, 11, 3037–3040Publication Date (Print):June 1, 1981Publication History Published online1 M…
A systematic comparative study of several series of chemically neighbouring compounds apt to give a reentrant mesomorphism is proposed. Experimental data concerning the various reentrant phases are summed up. From these observations various factors favourable to the occurence of the reentrance are revealed. Thus, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanisms of thermal decomposition of diethylbis(triethylphosphine)platinum(II)Thomas J. McCarthy, Ralph G. Nuzzo, and George M. WhitesidesCite this: J. Am. Chem. Soc. 1981, 103, 12, 3396–3403Publication Date (Print):June 1, 1981Publication History Published online1 May 200…
A method is described for measuring the mass/length or mass of molecular assemblies by comparative electron scattering in the STEM. Standard particles whose mass is well established (e.g. TMV or fd bacteriophage) are deposited on the electron microscope grid together with the sample to be measured. Images containing a…
The luminescence properties of the Bi 3+ ion as an activator in the series of compounds and vary considerably with the host lattice composition. The Stokes shift of the emission varies from 1500 cm −1 in the case of to 12,800 cm −1 in the case of . The large variation of the position of the emission band is ascribed t…
Raman scattering and optical depolarization measurements have been employed in investigations of the phase transition induced by the substitution of lithium for potassium in KTa${\mathrm{O}}_{3}$ to form ${\mathrm{K}}_{1\ensuremath{-}x}{\mathrm{Li}}_{x}\mathrm{Ta}{\mathrm{O}}_{3}$. Lithium concentrations as high as 5.…
Abstract Various microwave plasma treatments were applied to Kevlar in the form of multifilament fabric and single fiber. Plasma‐modified fabrics were used to construct two‐ply laminates using a triazine resin adhesive. Very significant increases in the bond strength of laminates may be attributed to the plasma treatm…
We present a method for measuring linear electrooptic coefficients involving comparative measurement of interferometric phase-modulation indices at wavelength λ = 6328 Å. The accuracy of the method (8–16%) varies according to the crystalline quality. We have investigated a new nonlinear crystal, 3-methyl 4-nitropyridi…
We present a novel electrostatic, energy-dispersive particle analyzer whose astigmatism can be used to measure the polar angle distribution of charged particles originating in a sample spot, in a multichanneling mode. The analyzer consists of a toroidal prism and a truncated conical lens, both coaxial on an axis throu…
Abstract A new series of aromatic‐aliphatic polyesters of general structure: magnified image R 1 = terphenyl, biphenyl, stilbene R 2 = (CH 2 ) n ; CH 2 C(Me) 2 CH 2 ;CH 2 ;C(Et) 2 CH 2 ; (CH 2 CH 2 O) n CH 2 CH 2 has been synthesised. The existence of thermotrpic liquid crystalline phases has been shown…
Abstract Details of the thermal behavior, including transition temperatures, transition heats and transition entropies, are reported for three series of nematic liquid‐crystalline “backbone” polyesters having the general structure magnified image All polysters described above were examined by differential scanning cal…
A relationship Is(φ) that is valid for arbitrary temperatures T ≲ Tc and thicknesses of d of the N layer is established for clean SNS sandwiches in the case when the Fermi velocities of the normal (vN) and the superconducting (vs) metals are related by the strong inequality vN ≪ vs. Dependences of the critical current…
The performance of insulators as determined by artificial tests for various contaminant levels at voltage levels ranging from 200 to 1000 kV dc are presented along with comparisons to field measurements. Included are the effects of polarity, insulator shed design, insulator spacing, and uniform and non-uniform contami…