Influencia de la cocción y enfriamiento del clinker de cemento portland sobre su estructura
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Materials Literature
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Autogenous healing of cement paste
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Plasticidad de las materias primas y de las pastas cerámicas
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Low-Temperature Deformation of Copper Single Crystals
Single crystals of copper were deformed at 4.2°K and 77.3°K. At 4.2°K, after a large strain produced by normal slip, jerky flow (discontinuous slip) occurs. From the study of reactor irradiated crystals, it was deduced that a packet of 30 slip lines, each containing 104 dislocations, was released to form each jerk of…
Scattering by an Inhomogeneous Solid. II. The Correlation Function and Its Application
Experiments on the angular intensity distribution of x-rays scattered by porous materials (hole structures) in the range of small angles are described. It is shown that the scattering can be characterized by an exponential correlation function in the case of a distribution of holes of random shape and size in solid; a…
BETA-PROPIOLACTONE IN STERILIZATION OF VACCINES, TISSUE GRAFTS, AND PLASMA
• Beta-propiolactone seems to be a superior sterilizing agent for biologicals because of its capacity to inactivate a wide variety of bacteria, fungi, and viruses. At the same time, this chemical has a minimal effect on proteins, avoiding final neutralization, and produces relatively nontoxic end products. The rapid p…
Magnetic Properties of Neodymium Single Crystals
Magnetic measurements have been made on single crystals of neodymium which were grown by the Bridgman technique. At 20.4\ifmmode^\circ\else\textdegree\fi{}K and above, the susceptibility obtained with the field perpendicular to the ${c}_{0}$ axis of the hexagonal crystal is greater than that obtained with the field pa…
Magnetic Properties of Perovskites Containing Strontium I. Strontium-Rich Ferrites and Cobaltites
Magnetic susceptibilities and electrical conductivities of (La, Sr)(Fe/Co)O x samples sintered in vacuo or in oxygen stream are measured here. Samples containing tetravalent magnetic ions in general have Curie contants smaller than those containing only trivalent ions. This fact and the high conductivity in the former…
The Thermal Decomposition of Methyl n-Butyl Ketone1,2
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Decomposition of Methyl n-Butyl Ketone1,2William T. Barry Jr. and W. D. WaltersCite this: J. Am. Chem. Soc. 1957, 79, 9, 2102–2108Publication Date (Print):May 1, 1957Publication History Published online1 May 2002Published inissue 1 May 1957https://pubs.acs.org/do…
The Corrosion Resistance of Ductile Iron In Sea Water and Petroleum Tanker Services
Laboratory data are given which compare the corrosion resistance of gray iron, steel and ductile iron in sea water and various acid solutions of different concentrations. Data also are presented to show the performance of ductile iron when used for product lines on petroleum tankers. Of particular interest is informat…
The thermal expansion of solids
The assumptions involved in two well-known formulae due to Grüneisen are investigated and with these assumptions an explicit formula for the volume of a solid as a function of temperature is derived. Application is made to the case of KCl and the results compared with experiment with a view to deciding whether defects…
Homogeneous Decomposition of Hydrogen Peroxide Vapor
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomogeneous Decomposition of Hydrogen Peroxide VaporCharles N. Satterfield and Theodore W. SteinCite this: J. Phys. Chem. 1957, 61, 5, 537–540Publication Date (Print):May 1, 1957Publication History Published online1 May 2002Published inissue 1 May 1957https://pubs.acs.org/do…
POLYPEPTIDES. Xa. ADDITIONAL COMMENTS OF THE AMINE-INITIATED POLYMERIZATION
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPOLYPEPTIDES. Xa. ADDITIONAL COMMENTS OF THE AMINE-INITIATED POLYMERIZATIONPaul Doty and R. D. LundbergCite this: J. Am. Chem. Soc. 1957, 79, 9, 2338–2339Publication Date (Print):May 1, 1957Publication History Published online1 May 2002Published inissue 1 May 1957https://pub…
Fast Neutron Effects in Tetragonal Barium Titanate
Tetragonal BaTiO3 is transformed into cubic BaTiO3 as a result of irradiation with fast neutrons at a temperature of approximately 100°C. Sufficient atomic displacements are produced by bombardment with an integrated fast neutron flux of 1.8×1020 n/cm2 so that tetragonal single crystals (c0=4.0349 A and a0=3.9923 A) e…
Paramagnetic Resonance Absorption in Gadolinium Trichloride
The paramagnetic resonance spectrum in crystals of GdCl 3 diluted with LaCl 3 and CeCl 3 has been examined. The splitting of the ground level 8 S 7,2 of Gd 3+ in zero magnetic field is small, and has a remarkable temperature dependence. A theory to account for the experimental results is developed, and it is shown tha…
Dissipation of Energy by 2.5–10 kev Electrons in Al2O3
Measurements have been made of the energy distribution of electrons penetrating thin samples of Al2O3. The observations were made using a 127° electrostatic analyzer. These results allow a determination of the dissipation of electron energy with depth when 2.5–10 kev electrons strike Al2O3. Results obtained indicate t…
The Spectrochemical Analysis of Corrosion Products on Lead Sheath of Cables
A procedure for the spectrochemical analysis of lead samples, such as corrosion products of lead sheath is described. The powdered material is buffered with germanium dioxide and graphite powder and the resultant mixture pelletized. Multisource type discharges are used. Desired elements can be measured over a wide ran…
Structure of 2,1,3-Benzoselenadiazole and Its Derivatives. I. Ultraviolet-Visible Absorption Spectra1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of 2,1,3-Benzoselenadiazole and Its Derivatives. I. Ultraviolet-Visible Absorption Spectra1EUGENE SAWICKI and ALBERT CARRCite this: J. Org. Chem. 1957, 22, 5, 503–506Publication Date (Print):May 1, 1957Publication History Published online1 May 2002Published inissue…
Thermodynamics of the Zr-ZrO2 System : The Dissociation Energies of ZrO and ZrO2
A mass spectrometric analysis of vapors effusing from a Knudsen cell containing either solid ZrO2 or a mixture of Zr and ZrO2 powders has been employed to determine the vapor pressures, and hence the heats of sublimation of these species. Combined with published thermodynamic data, these results yield 7.8±0.2 ev and 1…
Electrical Properties of Arc-Evaporated Carbon Films
Uniform thin films of carbon in the thickness range 100 to 2300 A have been prepared by arc-evaporation in vacuum. Evaporation rates were about 50 A/sec. The electrical properties of these films suggest that unannealed arc-evaporated carbon had less long-range order and was, therefore, more truly amorphous in structur…