Materials Literature
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Intensities of X-ray diffraction from α-AgI at various temperatures were measured in the absolute scale by using a G–M counter spectrometer with the crystal monochromated Cu Kα radiation. Measurements of the specific heat and the thermal expansion were also performed. A drastic temperature dependence of the intensitie…
Short-time tensile tests were m ade at temperatures ranging from 75 0 to 1,700 0 F on high-purity nickel, copper, a 70-percent-nickel-30-percent-copper alloy, and a 70-percenteopper-3 0-percent-nickel alloy. The high-purity component metals and the two alloys were investigated in the initial conditions, as annealed fo…
Previous investigators have indicated that both small particles and the addition of certain oxides promote the sintering of alumina at temperatures below 1700°C. By utilizing combinations of oxides and small particle size, the sintering temperature of 96% alumina bodies was reduced in this investigation to the 1300° t…
It is shown that, provided the effective atomic number remains constant, there is a general relationship between the variation of scatter with density and the variation with geometry of the system. A simplified analysis of the scatter contribution in water equivalent bodies is presented. This analysis leads to the def…
The rates of thermal decomposition of hydrogen peroxide vapor were measured by the static method at low pressures (0.2 to 20 mm. Hg), over the temperature range 300°–600 °C., in carefully cleaned glass vessels. The reaction was of the first order with respect to time and the final products were only water and oxygen.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneral Basic Catalysis of Ester Hydrolysis and Its Relationship to Enzymatic Hydrolysis1Myron L. Bender and Byron W. TurnquestCite this: J. Am. Chem. Soc. 1957, 79, 7, 1656–1662Publication Date (Print):April 1, 1957Publication History Published online1 May 2002Published ini…
Abstract Specific heat measurements have been carried out on granular and annealed Marlex 50, a polyethylene polymerized at relatively low pressures, over the temperature range −25 to 150°C. Calculation of the crystallinity yields maximum values of 82.6 and 93.8% for the granular and annealed Marlex 50, respectively.…
TH• Spotted and Brown towhaas (Pipilo erytkropkthalmus and P. fusees) are common and widespread species in western North America.Both are mainly terrestrial, have similar body proportions, and are at present considered congeneric.In spite of their ready availability as objects for study, their foraging behavior has on…
On the basis of Langmuir's theory of collection efficiencies, a model is derived to explain the removal of radioactive particulate matter from the atmosphere by rain. In this connection, Langmuir's collection efficiencies are modified to take into account the density of the solid particles, and are adjusted to express…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFORMATION OF A THREE-STRANDED POLYNUCLEOTIDE MOLECULEG. Felsenfeld, David R. Davies, and Alexander RichCite this: J. Am. Chem. Soc. 1957, 79, 8, 2023–2024Publication Date (Print):April 1, 1957Publication History Published online1 May 2002Published inissue 1 April 1957https:/…
TOR momentum operators by applying projection operators and we form an orthogonal set.For the uniform solution, St=i+ (LkAtg kt+CC).k»0 Noting that the method has a variational aspect, L» need not be taken from the small-oscillation analysis but may be freely chosen to describe average largeamplitude effects.We obtain…
Abstract The fine structure of the tarso-metatarsus of avian embryos has been investigated by means of thin sections in the electron microscope. The morphological features of osteoblasts are similar to those of fibroblasts, and where the organic matrix is just being deposited, fibrogenesis is found to occur in intimat…
The infrared-absorption spectrum of BaTi${\mathrm{O}}_{3}$ has been measured for thin single crystals and for powder samples dispersed in pressed KBr disks. Absorption bands for single-crystal samples occur at 495 ${\mathrm{cm}}^{\ensuremath{-}1}$ and at ca 340 ${\mathrm{cm}}^{\ensuremath{-}1}$, arising from normal vi…
The structure of NiWO4 has been determined, using the Fourier difference method to locate the oxygen atoms. The structure is based on a distorted hexagonal close packing of oxygen atoms with Ni and W atoms each occupying one-fourth of the octahedral interstices. The Ni and W atoms lie off the centers of their respecti…
A new determination of the atomic structure of CaTiOa has been made. It is orthorhombic, with space group _Pcmn; atomic coordinates are given. Synthetic crystals are identical with the majority of natural perovskite specimens. Two of the modes of twinning reported by Bowman from optical analysis have been confirmed by…
SYNOPSIS Muds collected by immersing bakelite panels in four West African harbours were examined for diatoms. The flora was found to consist of 194 species, 13 being new to science.
The orientation of micelles in jute fiber of different varieties, both Tossa and White having different values of intrinsic strength and quality ratio, has been studied. The Hermans' orientation factor, average angle of orientation, and angle at 40% intensity of ten different samples of jute fibers have been determine…
Summary The cation‐exchange capacities of soil separates, isolated by the International soda method and decantation from five basaltic soil profiles were determined by the neutral normal ammonium‐acetate method of Schollenberger and Simon. The exchange capacities of the clays ranged from 41 to 60 m.e. per cent. The re…
Th e co rros ion of singl e crystals of high-puri ty aluminum i n strollg ac id and alkali media is di sclosed as an ordedy process, the rate of attack bein g de pendent on the ori ent ation of the corroding s L Ilface. For a 15-percen t N aOH solution , corrosion a pparent ly prog ressedby r evealin g facet surf3ces…
Oxides having the magnetoplumbite structure and a wide range of magnetic properties have been examined. The magnetic saturations of the compositions MIIFe12O19 can be lowered by replacing part of the iron with the ions Al3+, Ga3+, Mn3+, Cr3+, and Ge3+ amongst others. MII in the above formula can be Ba2+, Sr2+, or Pb2+…