Resistencia química del hormigón. VII.-Acción del agua de mar artificial que fluye a través de un lecho de mortero fabricado con un cemento portland resistente al yeso
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Materials Literature
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Cenizas volantes y escorias en la industria futura
Resistencia química del hormigón. VIII.-Acción del agua de mar: Influencia de la adición de escoria a un cemento portland. Evolución de las resistencias mecánicas a flexotracción y del coeficiente de corrosión
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Empleo racional de los cementos para los diferentes tipos de obras
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Dependence of the Elongational Behavior of Polystyrene Melts on Molecular Weight and Molecular Weight Distribution
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation H. Münstedt; Dependence of the Elongational Behavior of Polystyrene Melts on Molecular Weight and…
Relativistic Charged Particle Identification by Energy Loss
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
On Predicting the Maximum Efficiency of Phosphor Systems Excited by Ionizing Radiation
A model allowing theoretical prediction of the maximum possible efficiency for any cathode‐ray or x‐ray phosphor is proposed, based on an earlier statistical analysis of e‐h pair generation by van Roosbroeck. The model is independent of the detailed band structure of a particular solid, and predicts the limiting yield…
On the formation and occurrence of saddle dolomite
Abstract Saddle dolomite is a variety of dolomite that has a warped crystal lattice; it is characterized by curved crystal faces and cleavage, and sweeping extinction. Perfect saddle forms have trigonal symmetry, with crystal elongation at high angles to the 'c' axis. Saddle dolomite occurs as both a void-filling ceme…
The quantitative analysis of surfaces by XPS: A review
Abstract A general framework is presented for the quantitative analysis of surfaces by X‐ray photoelectron spectroscopy (XPS or ESCA). The approach starts by considering analysis using reference data recorded on the same instrument and under identical conditions as the analysed sample. Matrix factors are evaluated and…
Electrical and optical properties of undoped and antimony-doped tin oxide films
Tin oxide films have been prepared on glass substrates by spray pyrolysis technique. The electrical and optical properties of undoped and antimony-doped tin oxide films have been studied. The temperature dependence of electron mobility has been analyzed to establish the electron conduction mechanism. Optical propertie…
A molecular beam study of the catalytic oxidation of CO on a Pt(111) surface
The oxidation of carbon monoxide catalyzed by Pt(111) was studied in ultrahigh vacuum using reactive molecular beam–surface scattering. Under all conditions studied, the reaction follows a Langmuir–Hinshelwood mechanism: the combination of a chemisorbed CO molecule and an oxygen adatom. When both reactants are at low…
Contact electrification
If two materials are brought into contact and then separated they are found to be charged; this is the phenomenon of ‘contact electrification’. The subject falls naturally into three divisions—electrification of metals by metals; of insulators by metals; and of insulators by insulators. The first of these is well unde…
Synthesis of Corroles and Octadehydrocorrins
A survey has been made of methods for the synthesis of corroles and their complexes with various metals, and also methods for the synthesis of metal complexes of 1,19-disubstituted octadehydrocorrins from biladienes, bilenes, and bilatrienes and of nickel complexes of 1-substituted octadehydrocorrins by the oxidative…
The effect of paramagnetic impurities on EPR linewidth in KMnF3. Experimental and theoretical studies
The EPR linewidth dependence on temperature and impurities concentration in KMn1-xMexF3 single crystals (where Me is Ni2+, Co2+, Fe2+) is investigated both experimentally and theoretically. The theoretical investigation is performed with the use of a nonequilibrium statistical operator method proposed by Zubarev (1971…
Macronet isoporous styrene copolymers: Unusual structure and properties
Abstract A systematic study of properties of macronet isoporous polymers of styrene offers the following model for their structure: A homogeneous loose highly crosslinked molecular network shrunk in the dry state and relaxed in the swollen one. This model allows to explain the considerable elasticity (changes in volum…
Nonlinear oscillations of non-spherical cavitation bubbles in acoustic fields
The nonlinear stability of gas bubbles in acoustic fields is studied using a multiple-scale type of expansion. In particular the development of a subharmonic or a synchronous perturbation to the flow is investigated. It is shown when an equilibrium non-spherical shape oscillation of a bubble is stable. If the amplitud…
Calcofluor White ST Alters the in Vivo Assembly of Cellulose Microfibrils
The fluorescent brightener, Calcofluor White ST, prevents the in vivo assembly of crystalline cellulose microfibrils and ribbons by Acetobacter xylinum. In the presence of more than 0.01 percent Calcofluor, Acetobacter continues to synthesize high-molecular-weight beta-1,4 glucans. X-ray crystallography shows that the…
Computational Methods for Profile Resolution and Crystallite Size Evaluation in Fibrous Polymers
X-ray diffraction patterns from fibres generally contain a few closely overlapping peaks, each broadened by the contributions of crystallite size, crystallite-size distribution, and lattice distortion. In order to achieve complete characterisation of a fibre by X-ray methods, it is first necessary to separate the indi…
Refinement of Cellulose and Chitin Structures
Abstract This paper is a review of x-ray diffraction work in the authors' laboratory to refine the structures of cellulose I and II, and α- and β-chitin, concentrating on the methods used to select between alternate models. Cellulose I is shown to consist of an array of parallel chains, and this conclusion is supporte…
Hall hysteresis loops in the vicinity of compensation temperature in amorphous HoCo films
Studies of the anomalous Hall hysteresis loop in the vicinity of Tcomp are carried out to explain whether or not it is caused by the composition gradient across the thickness in amorphous flash evaporated HoCo films. Domain structure appear, when they are magnetized reversal, in the inner as well as in the outer loops…