Principios de la termofísica del horno vertical de cemento
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Materials Literature
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La carretera de hormigón
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Medidas de la estabilidad de la carcasa de los hornos de rotación "shell"
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Un método rápido para determinar la resistencia a los sulfatos de los cementos
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The crystal structure of Na2Ti3O7
The crystal structure of Na2Ti30 ~ has been determined, using single-crystal methods. The space group is P21/m, with the unit-cell dimensions a=8.571, b=3.804, c=9.135 _~, fl=101.57 .
The Efficiency of Production of Characteristic X-radiation in Thick Targets of a Pure Element
A simple theoretical expression is proposed for K quanta production in directions at large angles to the surface of a thick target, neglecting absorption. Direct and indirect production are calculated and the ratio of indirect to total production is shown to be in agreement with experimental results both in magnitude…
On the Mechanism of Cavitation Damage by Nonhemispherical Cavities Collapsing in Contact With a Solid Boundary
A perfect fluid theory, which neglects the effect of gravity, and which assumes that the pressure inside a cavitation bubble remains constant during the collapse process, is given for the case of a nonhemispherical, but axially symmetric cavity which collapses in contact with a solid boundary. The theory suggests the…
Dielectric and X-Ray Studies ofCaxBa1−xTiO3andCaxSr1−xTiO3
Ceramics of ${\mathrm{Ca}}_{x}{\mathrm{Ba}}_{1\ensuremath{-}x}\mathrm{Ti}{\mathrm{O}}_{3}$ and ${\mathrm{Ca}}_{x}{\mathrm{Sr}}_{1\ensuremath{-}x}\mathrm{Ti}{\mathrm{O}}_{3}$ have been prepared and their dielectric and structural properties investigated. Firing conditions were adjusted to obtain sharp x-ray back reflec…
RelativisticL-Shell Photoeffect
The expressions of the relativistic $L$ shell photoeffect differential and total cross sections, for the case of light elements, are established. Coulomb wave functions are used for the description of the electron states in the calculation of the matrix elements, but it is shown how the results should be corrected so…
Nature of the Ferroelectric Transition in Triglycine Sulfate
The occurrence of linewidth transitions in the proton magnetic resonance spectra of triglycine sulfate, selenate, and fluoberyllate at the corresponding Curie points demonstrates that the ferroelectric transitions in these crystals are connected with a rearrangement of the basic ionic units in the unit cell. The resul…
Behavior of Strongly Shocked Carbon
Evidence is given for the conversion of graphite to the diamond phase when it is subjected to strong, explosively generated shocks. The data lend support to a further conversion at still higher pressures to a new, higher density phase, presumably the closely-packed metallic liquid. (L.N.N.)
The crystal structure of myoglobin: Phase determination to a resolution of 2 Å by the method of isomorphous replacement
The method of multiple isomorphous replacement has been used to solve the structure of the protein myoglobin to a resolution of 2 A. EDSAC II has been programmed to calculate the phase angles, and the statistical treatment of errors proposed by Blow & Crick has been used throughout, leading not to the most probable el…
X-ray determination of crystallinity and diffuse disorder scattering
An X-ray method of crystallinity determination has been developed which takes into account the diffuse scattering due to thermal vibrations and lattice imperfections in the crystalline part of a substance. Application of the method to a series of polypropylene samples shows that this diffuse scattering is predominantl…
Twinning in graphite
Abstract A detailed investigation has been made of twins in graphite crystals. The twins are regions misoriented from the crystal by a rotation of 20° 48' about a direction in the basal plane. The twin boundaries are shown to be simple tilt boundaries of a particular angle. As well as twins, bend planes of varying ang…
Infrared spectra of cis and trans isomers of poly(1,4‐cyclohexylenedimethylene terephthalate)
Abstract Infrared spectra have been recorded for cis and trans isomers of poly (1,4‐cyclohexylenedimethylene terephthalate) (PCHDT). Infrared dichroisms were determined and band assignments were made. From spectra of polymers in both the crystalline and amorphous phases it was determined that the crystalline bands for…
Sulfide Stress Cracking of Steels For API Grade N-80 Tubular Products
A laboratory investigation was made of various factors affecting the sulfide stress cracking resistance of a C-Mn-Mo grade of steel commonly used for producing API Standard 5A, Grade N-80 tubular products. It was found that the sensitivity to sulfide stress cracking of this steel in the normalized condition was increa…
Ein experimenteller Beitrag zur Theorie des elektrischen Widerstandes der Metalle
Es wird eine Meßzelle beschrieben, mit der bei einem Druck von p ≦ 5·10 -9 Torr der elektrische Widerstand dünner, auf einem Glasträger aufgedampfter Alkalimetallschichten bei 90°K und 60°K in Abhängigkeit von der Schichtdicke gemessen wurde. An denselben Schichten wurde auch ihre Thermospannung gegen Platin als Bezug…
Gamma‐Ray Induced Coloring of Some Phosphate Glasses
The changes in gamma‐ray induced optical absorption in phosphate glasses resulting from changes in composition, conditions during melting, and additions of small amounts of some oxides are discussed. A resolution of the induced spectra showed that the observed absorption is due to the superposition of three bands at 2…
Ultrarotuntersuchungen über den Einbau von H in natürlichem Quarz
Abstract The IR absorption spectra of various quartz crystals have been investigated; besides the vibrations due to the SiO 2 ‐lattice, there are bands in the 7000, 5000, 3000 and 900 cm −1 regions which are due to lattice imperfections. Variations in intensity of several powers of ten have been observed from one crys…
X‐Ray diffraction studies of poly(1,4‐cyclohexylenedimethylene terephthalate)
Abstract X‐ray diffraction methods were employed to determine a‐triclinic unit cell that describes the crystal lattice of poly ( trans ‐1,4‐cyclohexylenedimethylene terephthalate) (PCHDT). The crystal density was calculated as 1.265 g./cc., assuming one polymer repeat unit per unit cell. The fiber repeat period. 14.2…