Requisitos de estabilidad y de durabilidad de los áridos del hormigón
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Contribución al estudio de los reacciones de hidratación del cemento portland, por espectroscopio infrarroja Estudio de las fases sintetizadas del clínker de cemento portland
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Valoración del falso fraguado del cemento. Alcance de un método
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Tensión, deformación y fisurabilidad en el hormigón
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Durabilidad del hormigón
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Specimen replication for electron microscopy using x rays and x-ray resist
We point out the advantages of the use of x-ray resist as the recording medium in contact x-ray micrography, with subsequent viewing under the scanning electron microscope. Untreated specimens may be replicated with a resolution better than 100 nm. Photographs of latex spheres obtained by this technique are presented.
BRACKISH WATER AND FRESHWATER SPECIES OF THE DIATOM GENUS SKELETONEMA. II. SKELETONEMA POTAMOS COMB. NOV.1
SUMMARY Electron microscope investigations of the siliceous frustule show that the diatom described by Hustedt as Stephanodiscus subsalsus (A. Cleve) Hust. is not Skeletonema subsalsum (A. Cleve) Bethge (Melosira subsalsa A. Cleve) but is Microsiphona potamos Weber. This species is so similar to Skeletonema costatum (…
An experimental study of the kinetics of polymer crystallization during shear flow
Abstract Some principles of rheology are applied to the study of the shear‐induced crystallization of molten polymers. A new technique is described for measuring crystallization kinetics during isothermal flow at constant shear rate in a parallel plate rheometer. The crystallization rate is characterized by the time e…
A study of the motion of oil films on surfaces in air flow, with application to the measurement of skin friction
An oil film on a solid surface moves under the action of gravity or of the pressure gradient and skin friction resulting from the flow of air over the oil surface. Such oil flows are studied experimentally and theoretically. If the film is thin enough, the dominant force is the skin friction, and a simple relation is…
Structures of Two Crystalline Forms of Poly(butylene terephthalate) and Reversible Transition between Them by Mechanical Deformation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures of Two Crystalline Forms of Poly(butylene terephthalate) and Reversible Transition between Them by Mechanical DeformationMitsuru Yokouchi, Yoshio Sakakibara, Yozo Chatani, Hiroyuki Tadokoro, Tamotsu Tanaka, and Kentaro YodaCite this: Macromolecules 1976, 9, 2, 266…
Determination of the Structure of Cellulose II
The structure of regenerated cellulose is shown by x-ray diffraction to be comprised of an array of antiparallel chain molecules. The determination was based on the intensity data from rayon fibers and utilized rigid-body least-squares refinement techniques. The unit cell is monoclinic with space group P2(1) and dimen…
Can X-ray data distinguish bonding effects from vibrational smearing?
The frequent practice of combining X-ray and neutron diffraction for distinguishing vibrational smearing from charge deformation due to chemical bonding is neither necessary nor completely satisfactory. The two effects occur principally in distinct regions of real and reciprocal space. They can be distinguished by X-r…
Theoretical and experimental studies on one-dimensional magnetic systems
The present situation in theoretical and experimental studies on one-dimensional magnetic systems is fully discussed. Equal-time as well as the dynamic properties are included with an emphasis on the latter. Four model systems are examined in detail: TMMC (Heisenberg antiferromagnet), CsNiF3 (planar ferromagnet), CoCl…
Low-Energy Electrons and Surface Chemistry
Share Icon Share Twitter Facebook Reddit LinkedIn Reprints and Permissions Cite Icon Cite Search Site Citation G. Ertl, J. Küppers, Robert L. Park; Low‐Energy Electrons and Surface Chemistry. Physics Today 1 March 1976; 29 (3): 57. https://doi.org/10.1063/1.3023372 Download citation file: Ris (Zotero) Reference Manage…
Cleavage of type II and III collagens with mammalian collagenase: site of cleavage and primary structure at the amino-terminal portion of the smaller fragment released from both collagens
Collagenase cleavage of human Type II and III collagens has been studied using a highly purified preparation of rabbit tumor collagenase. Progress of the reactions in solution was followed by viscometry and the results indicated that under the conditions employed Type III collagen molecules were cleaved at approximate…
Optical studies of the 1.945 eV vibronic band in diamond
Abstract The 1.945eV band is the dominant end product of annealing radiation damage in diamonds containing isolated substitutional nitrogen atoms. In this paper uniaxial stress experiments are described which show the band to be a transition between A1 (ground) and E (excited) electronic states of a trigonal centre, t…
Band Structure and Optical Properties of Silicon Dioxide
The mixed-basis method has been used to compute the energy bands of an idealized $\ensuremath{\beta}$-cristobalite form of silicon dioxide. A direct-forbidden optical-absorption edge is predicted. Peaks in observed x-ray emission and optical-absorption spectra identified with critical points in the densities of states.
Free rotation of NO2 radicals in NaNO2 crystal
Infrared absorption spectra of ferroelectric NaNO2 crystals are obtained in the frequency range 700 to 950 cm−1 with polarized infrared rays. Periodic fine structures with spacing 4.35 cm−1 are observed for c-polarized rays in some of the specimens. These fine structures are attributed to the summation band of the v2…