Infrared Evidence for Collagen Structures
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Industrial Diamond Substitutes: I, Physical and X‐Ray Study of Hafnium Carbide
A study of hard materials in an effort to find possible substitutes for industrial diamonds led to research on hafnium carbide. This compound was prepared from a mixture of hafnium dioxide and lampblack in a carbon resistance furnace by solid‐state reaction or from a melt. Some factors affecting the combined carbon co…
O3-MONOACETYLMORPHINE
ADVERTISEMENT RETURN TO ISSUEArticleNEXTO3-MONOACETYLMORPHINELLEWELLYN H. WELSHCite this: J. Org. Chem. 1954, 19, 9, 1409–1415Publication Date (Print):September 1, 1954Publication History Published online1 May 2002Published inissue 1 September 1954https://pubs.acs.org/doi/10.1021/jo01374a001https://doi.org/10.1021/jo0…
Sensitivity--a criterion for the comparison of methods of test
In the evaillation of mall Y methods of test, t h e t \\'O usual cri tena-precision and aCCl!racy-are inwmcient.Accuracy is only applica ble wh ere compari sons with a standard can be made.Pr ec i ~ion, when interpreted as d egree of r ep roducibiltty, is ]Jot necessarily a measu r e of merit, becallse a me thod may b…
The Use of Iodine Adsorption as a Measure of Cellulose Fiber Crystallinity
Cotton Cellulose 1, 2, 3, 4 Buthanetetracarboxylic Acid (BTCA) Crosslinking Monitored by some Physical—chemical Methods
Cation Distribution and g Factors of Certain Spinels Containing Ni++, Mn++, Co++, Al+++, Ga+++, and Fe+++
X-ray measurements on NiOAl2O3, MnOAl2O3, and CoOAl2O3 show that the Ni spinel is almost completely inverted, the Mn partially so, and the Co compound almost completely normal. This information combined with the magnetic susceptibility vs temperature data yields a g-value of approximately 4.0 for both tetrahedrally co…
Theorie der Kristallplastizität
Es werden die Grundzüge einer Theorie der Kristallplastizität gegeben, die in wesentlichen Punkten von den bisherigen Theorien abweicht. Die kritische Schubspannung wird nicht, wie üblich, als kritische Länge von Frank-Read-Quellen, sondern als Wirkung der Spannungsfelder der im Kristall als Netzwerk vorhandenen Verse…
Ultrasonic Cavitation Thresholds in Water
The temperature dependence of the minimum sound pressure needed to produce cavitation in gassy water has been measured over a range of 0 to 30°C. Both plane progressive and focused waves of frequency one megacycle per second were used. The cavitation pressure threshold Pc is not a linear function of temperature, and i…
The Crystallographic Aspect of the Mechanical Twinning in Metals
In order to investigate twinning dislocations of metals, a simple crystallographical calculation is done, assuming that atomic movements are periodic as the twinning plane moves, that there is no diffusion, and that atoms come to new twin lattice sites from the most neighbouring original lattice sites of them. The she…
Solute Redistribution by Recrystallization
The time-dependent diffusion equation is solved using transformation calculus to obtain the solute concentration in a solvent after a segregating liquid-solid interface is passed through the material. The results are presented in graphical and tabular form for typical experimental conditions and compared with previous…
INFRARED STUDY OF THE N—OH GROUP IN ALPHA AND BETA OXIMES
The O—H bending and N—O stretching vibrations were studied in four pairs of isomeric oximes. A band at 1265 cm. −1 , characteristic of the solution spectra of the α oximes, is identified with the O—H bending mode. Tentative assignments for the N—O stretching vibration both in solid and solution spectra are advanced. T…
The Crystal Structure of Isonicotinic Acid Hydrazide1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal Structure of Isonicotinic Acid Hydrazide1L. H. JensenCite this: J. Am. Chem. Soc. 1954, 76, 18, 4663–4667Publication Date (Print):September 1, 1954Publication History Published online1 May 2002Published inissue 1 September 1954https://pubs.acs.org/doi/10.1021/ja0…
Über heterotype Mischphasen bei Seltenerdoxyden. II. Die Oxydsysteme des Cers und des Praseodyms
Abstract Die Phasenverhältnisse der Ceroxyde zwischen CeO 2 und Ce 2 O 3 und der Praseodymoxyde zwischen PrO 2 und Pr 2 O 3 werden durch Röntgenuntersuchungen bestimmt. Beide Oxydsysteme erweisen sich in der Zahl der beobachteten drei Phasen als völlig übereinstimmend und hinsichtlich der Ausdehnung dieser Phasen als…
Macro-ions. IV. The Ionic Strength Dependence of the Molecular Properties of Sodium Carboxymethylcellulose
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacro-ions. IV. The Ionic Strength Dependence of the Molecular Properties of Sodium CarboxymethylcelluloseNathaniel S. Schneider and Paul DotyCite this: J. Phys. Chem. 1954, 58, 9, 762–769Publication Date (Print):September 1, 1954Publication History Published online1 May 200…
The Inorganic Composition of the Blood of Mytilus Edulis and Anodonta Cygnea
ABSTRACT Analyses have been made of the inorganic constituents of the blood of Mytilus edulis and Anodonta cygnea. Mytilus blood resembles sea water in total concentration and composition, but has greater concentrations of calcium, potassium and total carbon dioxide. Anodonta blood has a very low total concentration o…
Motion of Individual Domain Walls in a Nickel-Iron Ferrite
Samples have been cut from single crystals of the nickel-iron ferrite (NiO)0.75(FeO0.25Fe2O3in such a way that they contain one and only one movable ferromagnetic domain wall. The viscous damping coefficient for this wall, which is a measure of the losses associated with domain wall motion in this material, has been m…
POLYPEPTIDES. II. THE CONFIGURATION OF POLYMERS OF γ-BENZYL-L-GLUTAMATE IN SOLUTION1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPOLYPEPTIDES. II. THE CONFIGURATION OF POLYMERS OF γ-BENZYL-L-GLUTAMATE IN SOLUTION1Paul Doty, A. M. Holtzer, J. H. Bradbury, and E. R. BloutCite this: J. Am. Chem. Soc. 1954, 76, 17, 4493–4494Publication Date (Print):September 1, 1954Publication History Published online1 Ma…
A Study of the Impact of Spheres on Plates
Measurements of the coefficient of restitution have been made for the impact of steel balls on plates of glass and plastics. The times of contact have also been measured. The coefficient of restitution is found to be a function of the size of the specimen as well as of its elastic and anelastic properties. The variati…
Effect of Rheological Behavior on Thermal Stresses
Since the conventional elastic analysis of thermal stress problems coupled with limiting creep rates and time-dependent fracture stresses as (inelastic) design criteria, results in design procedures for thermal stresses (in heat exchangers, nuclear reactors, flight structures at supersonic speeds, etc.) of considerabl…
Structure and Properties of Solid Surfaces.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Properties of Solid Surfaces.Paul H. EmmettCite this: J. Am. Chem. Soc. 1954, 76, 17, 4498–4499Publication Date (Print):September 1, 1954Publication History Published online1 May 2002Published inissue 1 September 1954https://pubs.acs.org/doi/10.1021/ja01646a086…