¿Por qué deben conservarse bajas las temperaturas de la molienda?
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Ábacos de composición potencial y de fusión del clínker
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Sulphate attack on brickwork
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Infrared spectra of crystalline polysaccharides. V. Chitin
Abstract The polarized infrared spectra of crab chitin crystallites, blowfly larval cuticle, lobster tendon, and partially deacetylated lobster chitin have been studied. In addition, the spectra of amorphous deacetylated chitin, deuterated lobster chitin and crystalline N ‐acetylated chitohexaose were obtained and ana…
Note on the Paramagnetic Resonance of Iron in Glass
Fe+ + + and Fe+ + ions in glass have been studied by means of paramagnetic resonance. The correlation of the Fe+ + + concentration with an intense resonance at g=4.27 shows the resonance is due to Fe+ + +. A theory is proposed explaining the observed g value and the implications for the atomic surroundings of Fe+ + +…
The flow of polycrystalline metals under simple shear. II
Abstract The flow of lead of different purities under conditions of simple shear has been investigated over a wide range of strain, at different stresses, and mostly at a temperature in the neighbourhood of 27 °C. The phenomena have been studied both with unchanged direction of stress and with the direction of stress…
Adsorption and oxide formation on aluminium films
Abstract Type I aluminium films deposited at 0 °C were of relatively low area, ca. 1000 cm2, stable and with a certain porosity since CO uptake was proportional to film weight. Thus a film area could be determined from its weight, since at saturation CO molecules occupy 0·75 of the total surface area given by the B.E.…
Photoconductivity of Cuprous Oxide in Relation to Its Other Semiconducting Properties
It is shown that at least two of the three known peaks in the photoconductivity versus wavelength curve of ${\mathrm{Cu}}_{2}$O are strongly dependent on the oxygen content of the material. The peak near 600 m\ensuremath{\mu} can be shifted from shorter to longer wavelengths by exposing the sample to relatively low ox…
The Geochemistry of Scapolite Part I. Previous Work and General Mineralogy
The literature on the mineralogy and petrology of the scapolite family is reviewed. The general formula was examined in the light of 126 analyses from the literature, together with 9 new analyses. Of these 135 analyses, refractive indices were available for 64. Sixty-four of the analyses were rejected as unsatisfactor…
Beitrag zur Systematik der Korrosion der Metalle im Erdreich. III. Kupfer und Kupferlegierungen
Abstract Elektrochemische Laboruntersuchungen an einem einfachen Modellsystem ergaben, daß für das Verhalten des Kupfers und der Kupfer‐Legierungen im Erdreich zwei Einflüsse: Sättigungszustand und p H ‐Wert des Bodens maßgebend sind. Auf Grund der einfachen Darstellung des Verhaltens des Kupfers und der Kupfer‐Legier…
What is ferromagnetic resonance?
It is pointed out that two distinct resonance effects take place in ferrite samples at microwave frequencies, ferromagnetic resonance and an effect due to the shape of the specimen. The latter effect is called Kittel resonance in this paper. It is commonly supposed that the two effects are the same, but it is shown th…
Adsorption of Hydrolyzed Polyacrylonitrile on Kaolinite
Abstract Adsorption experiments were conducted by mixing homoionic kaolinite and C 14 -labeled hydrolyzed polyacrylonitrile (HPAN) in water and solutions of electrolytes. Langmuir type adsorption isotherms resulted. Exchange cations on kaolinite increased adsorption in approximately the same order as such cations redu…
The Effect of Guanidine Hydrochloride on Crystalline Pepsin
In a previous communication, it was shown that on prolonged exposure to urea at temperatures above 20" pepsin is irreversibly inactivated (1).The loss of activity is most marked in the pH range of 4.6 to 5.6 and is always accompanied by the formation of nonprotein material that originates from autodigestion of the pro…
Structural changes in collagen. The action of alkalis and acids in the conversion of collagen into eucollagen
substrate during the reaction; wavelength, 284 mu (or within the range 284-290 mu); initial substrate concentration, within the range 0 1-0 3 mg./ml.; slit width as narrow as possible. The final decision on slit width will depend on the conditions of the experiment and the sensitivity and stability of the spectrophoto…
Notes- Epoxidation of Cinnamaldehyde by Alkaline tert-Butyl Hydroperoxide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNotes- Epoxidation of Cinnamaldehyde by Alkaline tert-Butyl HydroperoxideGeorge PayneCite this: J. Org. Chem. 1960, 25, 2, 275–276Publication Date (Print):February 1, 1960Publication History Published online12 March 2003Published inissue 1 February 1960https://doi.org/10.102…
Phase-Contrast Observations on Streptomyces coelicolor
SUMMARY: Observations on living colonies of Streptomyces coelicolor strain A3(2) growing on cellophan films were made by phase-contrast microscopy. Particular attention was paid to the mode of origin of the aerial mycelium. It was shown conclusively that aerial hyphae can originate as simple branches of the substrate…
Orientation and Packing of Aliphatic Chain Molecules on Montmorillonite
Abstract Aliphatic chain molecules may be adsorbed on montmorillonite surfaces with the zigzag of their carbon chain either parallel or perpendicular to the surface. These orientations are designated α II and α I , respectively. Fourier syntheses have too few terms to distinguish clearly between these orientations. Th…
Halloysite and Gibbsite Formation in Hawaii
Abstract Desilication and removal of bases from the basalitic rocks of the Hawaiian Islands produces large amounts of halloysite and gibbsite, together with variable quantities of allophane and nontronite, iron and titanium oxides, and amorphous mineral and gel material. The nature and relative abundance of intermedia…
Time-Dependent Internal Friction in Aluminum and Magnesium Single Crystals
Magnesium and aluminum single crystals subjected to varying amounts of oscillatory strain of audio frequency have been investigated by measuring the strain amplitude-dependent complex dynamical-mechanical modulus at audio frequencies as a function of temperature and time. If the amplitude of the applied excitation exc…
Double-Quantum Electron Spin Resonance Transitions of Nickel in Magnesium Oxide
Received 21 December 1959DOI:https://doi.org/10.1103/PhysRevLett.4.128©1960 American Physical Society