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In separate experiments, mature rats were either given a ration containing L. leucocephala leaf meal at 15% or 7 3% level, or dosed orally each day with water extract of the leaf meal before and during the breeding period. At the 15% level, the food intake of the rats was greatly reduced, and they showed general sympt…
The electrical conductivity of magnesium oxide single crystals has been measured for the first time in the temperature range 400-750°C. Results agree well with those obtained by other workers at higher temperatures and a single activation energy of about 2·8±0·1 ev seems to apply from 400 to 1800°C. Fields varying fro…
Change-transport phenomena in thin films of vanadium dioxide have been investigated. This paper presents conductivity, Hall coefficient, and thermoelectric power data for reactively sputtered vanadium dioxide thin films both above and below the metal-semiconductor transition. Measurements were made both on single-crys…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation E. D. Morris, Harold S. Johnston; Digital Phase Sensitive Detector. Rev Sci Instrum 1 April 1968;…
A semidestructive method has been developed for determining the principal residual stresses and directions in rectangularly orthotropic materials. The reduction equations are based upon a set of functions that describe the surface strain-relaxation field about a hole drilled to a limited depth into the material. Three…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMethanetetraboronic esterRichard B. Castle and Donald S. MattesonCite this: J. Am. Chem. Soc. 1968, 90, 8, 2194Publication Date (Print):April 1, 1968Publication History Published online1 May 2002Published inissue 1 April 1968https://pubs.acs.org/doi/10.1021/ja01010a057https:…
The fluorescence of Nb5+-activated antimonates is reported. A relation has been found between the position of the maximum of the excitation (and absorption) band of the niobate octahedra and the quenching temperature of their fluorescence. This result can be explained using a simple configuration-coordinate diagram. T…
Abstract The thermal and oxidative degradation of poly(phenylene sulfide) and perfluoropoly(phenylene sulfide) have been studied by a weight‐loss method. The products of breakdown in vacuum have also been analyzed. The poly(phenylene sulfide) is more thermally stable in inert and oxidizing atmospheres than the fully f…
Abstract The adhesion between a polymer and a solid substrate may be considered to be one type of complex liquid‐solid interaction. Relationships between surface wettability and bulk properties of liquidlike polymers are discussed. A new and direct empirical relationship between the glass temperature ( T g ) and criti…
A multilayer model of the interface between a solid and a regular solution has been developed by treating the solution phase in the grand canonical ensemble. The partition functions necessary for the evaluation of the grand partition function are obtained using either the quasi-chemical or Bragg-Williams approximation…
The Dorn method, most commonly used to measure the activation energy of creep, was used to study the initial stage of sintering uranium dioxide in hydrogen from 700° to 850°C. The activation energy was approximately 100 kcal/mole. This result agrees with the value determined from analysis of isothermal shrinkage curve…
Far-infrared spectra of imidazole, imidazole-d4, 1-methyl imidazole, and 1-methyl-d3 imidazole have been examined in the 300 − 33-cm− 1 range. Six of the nine infrared-active lattice modes of crystalline imidazole have been observed and assigned. A tentative assignment of these frequencies in terms of hydrogen-bond mo…
Magnetomechanical damping in ferromagnetic materials has its source in stress-driven irreversible movement of magnetic domain boundaries. The maximum damping is proportional to λsE/σi, where λs is the saturation magnetostriction, E is Young's modulus, and σi is the average internal stress opposing domain boundary moti…
The crystal structure of ceric ammonium nitrate, (NH^^Ce^O^)^, has been determined from three dimensional single-crystal X-ray dif fraction data collected by counter methods.The crystals are monoclinic, space group P2^/n with unit cell parameters a = 13.061± 0. 007, b = 6.842 ± 0. 004, c = 8. 183 ± 0. 004A, B = 91.34±…
A series of mixed metal oxides with perovskite-type structure, A 2 (FeMo)O 6-λ (where A=Ba, Sr and Ca), were synthesized. The ferrimagnetic Néel temperatures of Ba 2 (FeMo)O 6 , Sr 2 (FeMo)O 6 and Ca 2 (FeMo)O 6 , were respectively found to be 351°K, 450°K and 398°K, with the saturation moments of 3.6∼3.2 µ B . The Mö…
The optical properties of strongly absorbing uniaxial crystals are examined. Equations for the reflectances for the basal plane are derived. The angle of refraction is discussed and the absorption coefficient for the ordinary wave is derived. The reflectance equation is solved in a form suitable for computer calculati…
It is shown that there is a size below which a coherent spherical precipitate cannot maintain a dislocation loop at its interface. There is also a size above which the incoherent (i.e. dislocated) state is stable with respect to the coherent state. Experiments in the electron microscope show that there is indeed a siz…
Crevice corrosion of titanium in high temperature sodium chloride solutions was investigated, Corrosion occurred only in very restricted crevices and attack was greater the higher the salt concentration. It was shown that crevice corrosion occurs because of the development of a low ( ~1) pH in the solution within the…
The flow stress distribution below the surface of previously deformed large copper single crystals is obtained when these are sliced into smaller component crystals. It is found that a considerable flow stress gradient extends for a distance of about 2 mm below the surface, measured along the slip direction. Electron…
Electrolytic charging of hydrogen onto Type 304L stainless steel at room temperature and 100 C (212 F) induced partial transformation of the austenite to the same martensitic phases [α′(bcc) and ε (hcp)] as are formed by cold-working hydrogen-free austenite at low temperatures (-196 C) (-321 F). No evidence of a hexag…