Influencia de la dosificación en cemento sobre la corrosión de armaduras, negras y galvanizadas provocado por lo penetración de Cl- en el mortero
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Materials Literature
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Resistencia química del hormigón. XI.- Contribución al estudio del sistema: cemento P-450-Y hidratado-agua desionizada
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Resistencia química del hormigón. XII.- Influencia de la adición de escoria a un cemento portland. Estudio por DRX del sistema cemento 3/escoria-agua potable filtrada
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8º Congreso Internacional de la Química de los Cementos Comité Científico Euro-Asiático 1ª Reunión del 14 de Septiembre de 1981 en París
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The theoretical and microdosimetric basis of thermoluminescence and applications to dosimetry
This review deals with the following subjects: general characteristics of TL materials (including: LiF; Li 2 B 4 O 7 ; BeO); TL dose response and TL models (including: dependence of f(D) on impurity composition; supralinearity of individual glow peaks); ionising radiation dosimetry (including: dose response; cavity th…
Nonstoichiometry in Undoped BaTiO 3
Equilibrium electrical conductivity data for large‐grained, poly crystalline, undoped BaTiO 3 , as a function of temperature, 750° to 1000°C, and oxygen partial pressure, 10 −20 < P O2 <10 −1 MPa, were quantitatively fit to a defect model involving only doubly ionized oxygen vacancies, electrons, holes, and acci…
Studies on Bound Water of Cellulose by Differential Scanning Calorimetry
The crystallization and melting of adsorbed water on cellulose samples such as cotton, kapok, linen, jute, various rayons, and wood cellulose have been studied using a differential scanning calorimeter (DSC). Two exothermic peaks of crystallization of adsorbed water on the cellulose samples are observed. One is a shar…
Layered synthetic microstructures as Bragg diffractors for X rays and extreme ultraviolet: theory and predicted performance
Recent developments in thin film technology have made possible the construction of multilayered thin film structures that act as efficient Bragg diffractors for x rays and extreme ultraviolet (EUV) radiation. These structures (which we term layered synthetic microstructures or LSMs) are analogous to multilayer interfe…
A Critical Evaluation of Indentation Techniques for Measuring Fracture Toughness: II, Strength Method
An examination is made of the sharp‐indentation technique of strength‐test precracking for toughness evaluation. The experimental approach follows that proposed by other workers but the theoretical analysis contains one vital new feature; the residual‐stress term discussed in Part I of this study is now introduced exp…
Mechanism and parameters of the quenching of luminescence of rare-earth ions by hydroxyl impurity groups in laser phosphate glass
An experimental study was made of the parameters and mechanism of the quenching of the luminescence of rare-earth ions by hydroxyl groups. This was done for nine transitions. The permissible concentration of the OH groups were found for laser glasses intended for different applications.
Antiferrodistortive Jahn-Teller ordering in KDy(MoO4)2
KDy(MoO 4 ) 2 is known to undergo a structural phase transition at 14.3K. Spectroscopic and magnetic studies of the behaviour of this compound at low temperatures have revealed some striking properties which suggest that the phase transition is of the Jahn-Teller type and that ordering occurs in an antiferrodistortive…
Bond-Length Change as a Tool to Determine Charge Transfer and Electron-Phonon Coupling in Graphite Intercalation Compounds
A theory is formulated that explains the observed bond-length change in graphite intercalation compounds in terms of the charge transfer $f$. The values of $f$ obtained via the bond-length changes are in good agreement with those derived with other methods. The present analysis also provides information on the electro…
The observation of a sharp peak in the deep-level photoconductivity spectrum of GaAs(Cr) due to the Cr2+(5T2-5E) 'intracentre' transition
The 0.82 eV intracentre transition of Cr 2+ ( 5 T 2 to 5 E) in GaAs is observed as a very sharp peak in the low-temperature photoconductivity response. The dependence of the photoconductivity on temperature and electric field is discussed and a comparison is made with the corresponding line in absorption. The results…
Neutron diffraction study of the incommensurate magnetic phase of Ni0.92Zn0.08Br2
The magnetic structure of Ni 0.92 Zn 0.08 Br 2 has been studied by single-crystal neutron diffraction as a function of temperature down to 4.2K and in magnetic fields along (110) up to 3 T. From T N =48.0+or-0.5K to T IC =21.0+or-0.5K the magnetic structure is a collinear easy-plane metamagnetic one like NiCl 2 . Belo…
Fluoride-glass-cladded optical fibres for mid-infra-red ray transmission
Cladded-type fluoride glass fibres with a transmission loss of 0.1 dB/m at 2.5 μm and 0.3 dB/m at 3.6 μm, respectively, were fabricated by a novel casting method. Relative refractive-index differences between core and cladding ranging from 0.17% to 0.33% were obtained using BaF2-GdF3-ZrF4-AlF3 glasses as core and clad…
Mean spherical approximation for a model liquid metal potential
The solution of the Ornstein-Zernike equation for a direct correlation function c(x) with damped oscillations and a hard core condition imposed upon the total correlation function h(x) has been proposed by Cummings as a means of treating a simple model potential for liquid metals in the mean spherical approximation [1…
Multivalency of the partitioning species in quantitative affinity chromatography. Evaluation of the site-binding constant for the aldolase-phosphate interaction from studies with cellulose phosphate as the affinity matrix
Theory is presented which describes the competitive interaction of a multivalent solute with a univalent ligand and an affinity matrix. The formulation accounts for cross-linking interactions of the multivalent solute, and of its complexes with ligand, with matrix interaction sites in terms of two site-binding constan…
Selective modification of aspartic acid-101 in lysozyme by carbodiimide reaction
A general procedure which selectively introduced a nucleophilic group at a particular location in the active site of lysozyme has been developed. The coupling of hen egg white lysozyme with amine nucleophiles by 1-ethyl-3-[3-(dimethylamino)propyl]carbodiimide hydrochloride (EDC) was studied at pH 5 and room temperatur…
Effect of macromolecular crowding upon the structure and function of an enzyme: glyceraldehyde-3-phosphate dehydrogenase
The specific activity of rabbit muscle glyceraldehyde-3-phosphate dehydrogenase (GAPD) has been measured as a function of GAPD concentration in the absence and presence of 18 g/dL ribonuclease A. The specific activity of GAPD at fixed concentration has been measured as a function of the concentration of added ribonucl…
Faulted structure in the FeCr σ-phase
Faulted structures in the FeCr σ-phase are observed in lattice images by the use of a high resolution transmission electron microscope and local atomic arrangements near the faults are deduced from the images. The faults can be divided into two classes from a structural point of view. A fault lying in the (110) plane…