Materials Literature
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Abstract Cellulose has been irradiated by ultraviolet light. The degradation was followed viscometrically and by weight loss measurements. The changes in the degree of Polymerization and weight of the irradiated material indicated that the degradation is random and follows first order kinetics. It is suggested that ch…
Direct measurements are reported of the dependence of the anisotropy torque on the orientation of an applied magnetic field in the $\mathrm{ac}$ and $\mathrm{bc}$ crystallographic planes of ferrimagnetic ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Ga}}_{2\ensuremath{-}x}{\mathrm{O}}_{3}$ for $x=1.11$. Temperatures betwe…
Paramagnetic resonance has been observed from both single ions and isolated pairs of ${\mathrm{Gd}}^{3+}$ in Eu${\mathrm{Cl}}_{3}$ at 77\ifmmode^\circ\else\textdegree\fi{}K and 25.6 GHz. The pair spectra were analyzed in the same way as those observed previously from ${\mathrm{Gd}}^{3+}$ in La${\mathrm{Cl}}_{3}$. The…
The absorption spectrum of samples of ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ doped with Ti, V, and Cr has been measured at 4.2\ifmmode^\circ\else\textdegree\fi{}K over the frequency range 5-120 ${\mathrm{cm}}^{\ensuremath{-}1}$ in applied magnetic fields up to 55 kOe. In ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$:Ti, absorp…
Five sharp lines in the optical absorption spectrum of antiferromagnetic ${\mathrm{Cr}}_{2}$${\mathrm{O}}_{3}$ are investigated, and the assignments of four of the lines as Frenkel exciton absorptions are discussed in detail. A previous exciton assignment of these lines is shown to be inconsistent with the results of…
It has been found that various properties of liquid metals are interpretable in terms of a hard-sphere model. Since electronic screening of pair interactions in metals leads to density-dependent hard-sphere diameters, we have examined the effect that this has on the thermodynamic equations. The virial equation is show…
Historically, man's efforts to resist the effects of corrosion can be traced back several hundred years. Sir Hugh Platt (1552–1611) noted that an ‘oily substance’ prevented iron work rusting. The famous Dr. Angus Smith (1817–1884) patented a technique for coating heated metal pipes with ‘coal oil’ to resist corrosion.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure, Properties, and Cross-linking Reactions of Poly(ester acetals)Robert W. LenzCite this: Macromolecules 1969, 2, 2, 129–136Publication Date (Print):March 1, 1969Publication History Published online1 May 2002Published inissue 1 March 1969https://pubs.acs.org/doi/10.1…
An adiabatiecopper ca l? rim e ter wa s used to determine th e heats of vul ca niza ti o n of pal e c re~e natura l rubber wIth s ulfur for mIxtures varying in com pos iti o n from 0 to 32 pe rce nt added s ulfur. The s id e rea ction that produces hydroge n s ulfide was avoided by us in " reacti on te mpe ratures nea…
Using as a base the Cd0‐B 2 O 3 ‐Si0 2 photoconducting glass previously found, various systematic substitutions and additions were made to determine their influence on the photoresponse of these glasses. Complete substitution of GeO 2 for SiO 2 led to the highest photocurrents observed in these glasses and to a shift…
Minimum-weight design of a portal frame for alternative loadings is discussed. A linear programming formulation is used. The concept of Foulkes mechanism as the necessary and sufficient condition for optimum is generalized for this class of problems.
Measurement of saturation magnetization and Curie temperature were made of the solid solutions (Fe1−yMny)1.67Ge for 0≤y≤0.4. The Curie temperature decreased linearly from 485° to 326°K while the saturation magnetization, in μβ per mole, decreased from 2.65 to 2.35 for y=0.2 and then increased up to 2.66 for y=0.4. The…
One of the unanswered questions in the study of fatigue is how cracks nucleate at stresses far below the static fracture strength. Previous theories show possible qualitative mechanisms that may operate in a crystal at room and low temperatures but none provides a quantitiative theory of this phenomenon. We show here…
The existing literature on UAl2-Al dispersions is surveyed and a comparison with similar data for UAl3-Al dispersions is attempted. The experimental work included the preparation of a practically single-phase UAl2 compound by induction-melting and its grinding to a predetermined particle size. The blending of UAl2 and…
It is demonstrated by means of freely corroding total immersion tests and anodic and cathodic polarization experiments, that small amounts of arsenic in solid solution in α-brass, effectively prevent dezincification even in the most agressive media. On the other hand, the addition of relatively large amounts of arseni…
The thermal diffusivity of the ThO2-UO2 system in solid solution was measured by laser pulse method at temperatures ranging from 20° to 500°C. Reproducibility of the data was confirmed to be within 3%. The compositions of the samples were ThO2, ThO2-1%UO2, ThO2-5%UO2 and ThO2-10%UO2. The thermal conductivity was calcu…
The effects of Y and Bi substitutions on spin reorientation in ErFeO3 have been studied through optical absorption and magnetization measurements. Below the reorientation temperature Tr, optical absorption lines from low-lying Er3+ levels show splittings of several cm−1. The splittings decrease above Tr. With addition…
The mature akinete coat of a Cylindrospermum species contains laminar layers, not present in immature akinetes, and a thickened intermediate layer.
The effect of micrestructure on the glass temperature Tg of poly (α-methyl styrene) has been investigated. It has been observed that Tg increases as the syndiotacticity of the molecule increases-thus Tg = 446 ± 2°K for polymer with 67% syndiotactic placements, while a value of Tg = 453 ± 2°K is found for a sample with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterpretation of the kinetics of thermogravimetric analysisEli S. Freeman and Benjamin CarrollCite this: J. Phys. Chem. 1969, 73, 3, 751–752Publication Date (Print):March 1, 1969Publication History Published online1 May 2002Published inissue 1 March 1969https://pubs.acs.org…