Materials Literature
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The deformation produced by point loading on the cleaved basal surfaces of graphite crystals has been studied in the scanning electron microscope. The experiments were of two types, viz. sliding and static contact. In the first a small tungsten stylus (tip radius ∼ 1 μm) was slid on the graphite surface inside the sca…
Preliminary to detailed amino acid sequence analysis of the peptide α1‐CB7 from calf skin collagen, the chymotryptic, tryptic and thermolytic peptides were isolated and their positions in the intact chain determined. The collagenase derived peptides α1(78), α1(125) and α1(78)‐CBN were also used as source of peptides a…
Abstract Unstable carbonyl ion Ag(CO)n+ was prepared from Ag2O, Ag2SO4 or AgClO4 and carbon monoxide in H2SO4 or H2SO4–SO3 solution. The value of ″n″ was 0∼ 2.0 at −10∼30°C, under CO pressure of 1∼19 atm.
To determine the effect of various impurities on the thermoluminescent properties of lithium borate, 60 phosphors were initially prepared which were individually doped with three different concentrations of manganese, cobalt, magnesium silver or one of 15 rare earth elements. Silver and manganese were the only impurit…
Abstract Shubnikov‐de Haas experiments were performed between 1.8 and 4.2 K on n‐Bi 2 Te 3 single crystals with carrier concentrations between 1.4 × 10 18 and 8.4 × 10 19 cm −3 .In addition the magneto‐Seebeck effect was measured between 20 and 100 K in transverse magnetic fields up to 6 T (60 kG). The Hall effect and…
Visible absorption features in (Mg, Fe) ${\mathrm{Al}}_{2}$${\mathrm{O}}_{4}$ are assigned to spin-forbidden electronic transitions on tetrahedral ${\mathrm{Fe}}^{2+}$. Values of the Racah parameters $B$ and $C$ are fitted to the observed spectrum. The spin-allowed transitions indicate an appreciable nonionic characte…
Four different theories predicting the burst strength of longitudinally slit pressurized fabric cylinders are compared with tests of warp cylinders having various diameters and lengths, containing slits of various lengths and widths. The fabric used was a neoprene-coated Dacron polyester with a warp strength of about…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal electron paramagnetic resonance study of a trigonal vanadium tris(dithiolate) complexWhei Lu Kwik and Edward I. StiefelCite this: Inorg. Chem. 1973, 12, 10, 2337–2342Publication Date (Print):October 1, 1973Publication History Published online1 May 2002Publishe…
Using long-wavelength ($\ensuremath{\lambda}\ensuremath{\sim}2.4$ \AA{}) neutrons, diffraction patterns of ErFe${\mathrm{O}}_{3}$ were taken at 140, 4.2, and 1.5\ifmmode^\circ\else\textdegree\fi{}K. Two possible structures for the ${\mathrm{Fe}}^{3+}$ spin system at 1.5\ifmmode^\circ\else\textdegree\fi{}K were found t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysicochemical and biological studies on the metal-induced conformational change in troponin A. Implication of carboxyl groups in the binding of calcium ionWilliam D. McCubbin and Cyril M. KayCite this: Biochemistry 1973, 12, 21, 4228–4232Publication Date (Print):October 1,…
Variations in Auger electron signal intensities with changing primary electron angle of incidence have been correlated with the Kikuchi display from a Si (111) surface. From this correlation a qualitative depth distribution of the carbon contaminant is inferred.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadiation chemistry of aqueous solutions of simple RCN [hydrogen or alkyl cyanide] compoundsI. Draganic, Z. Draganic, Lj. Petkovic, and A. NikolicCite this: J. Am. Chem. Soc. 1973, 95, 22, 7193–7199Publication Date (Print):October 1, 1973Publication History Published online1…
Metavariscite, AlPO 4.2H 2O, monoclinic, P2 1/ n, a=5.178 (2), b=9.514 (2), c=8.454 (2) Aring, beta=90.35 (2)deg, Z=4, Dm=2.54, Dx=2.535 g cm -3. PO 4 tetrahedra share vertices with four AlO 4(OH 2) 2 octahedra and vice versa. With Al...O distances of 1.892 (2) and 1.953 (2) Aring the two waters coordinate the aluminu…
The multiple α absorption of bulk-crystallized polyethylene (PE) was separated into the α1 and the α2 absorptions on the assumption that this α2 absorption is associated with shear deformation of lamellar crystals, i.e., has the same characteristics as in single crystal mats. The separated α1 mechanism is related to t…
Abstract The fracture surface of notched impact specimens of polycarbonate tested in the range 130°C to −196°C have been studied by use of optical microscopy and scanning electron microscopy. The morphological features associated with the initiation and propagation of fracture have been determined and interpreted in t…
Magnetic susceptibilities have been measured in the temperature region 1.7–60°K both parallel and perpendicular to the chemical chain on single crystals of Cu(pyrazine)(NO3)2. It has been shown that there is qualitative disagreement between experiment and theory if the appropriate equations derived for the Ising model…
Abstract Dynamic x‐ray diffraction and dynamic birefringence techniques are employed to determine the nature of the molecular motions associated with the α mechanical loss processes for low‐density polyethylene. The results indicate that the low‐temperature part of this loss (designated α 1 ) is associated with an int…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton nuclear magnetic resonance line widths and spin relaxation in paramagnetic metalloporphyrins of chromium(III), manganese(III), and iron(III)Gerd N. La Mar and F. Ann. WalkerCite this: J. Am. Chem. Soc. 1973, 95, 21, 6950–6956Publication Date (Print):October 1, 1973Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCopper(II) and vanadyl complexes of binucleating ligands. Magnetic exchange interactions propagated through an extensive organic systemElvira F. Hasty, Therese J. Colburn, and David N. HendricksonCite this: Inorg. Chem. 1973, 12, 10, 2414–2421Publication Date (Print):October…
The $4{f}^{1}\ensuremath{\rightarrow}5{d}^{1}$ transitions of ${\mathrm{Ce}}^{3+}$, ${E}_{u}^{\ensuremath{'}\ensuremath{'}}(^{2}F_{\frac{5}{2}})\ensuremath{\rightarrow}{U}_{g}^{\ensuremath{'}}(^{2}T_{2g})$ and ${E}_{u}^{\ensuremath{'}\ensuremath{'}}(^{2}F_{\frac{5}{2}})\ensuremath{\rightarrow}{E}_{g}^{\ensuremath{'}\e…