Materials Literature
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Density-functional simulations are used to calculate structural properties and high-symmetry phonons of the hypothetical cubic phase, the stable orthorhombic phase and an intermediate tetragonal phase of magnesium silicate perovskite. We show that the structure of the stable phase is well described by freezing in a sm…
Abstract A computer model was developed to calculate the heat release rate of aircraft cabin panels in the OSU calorimeter based on their thermophysical, thermochemical and geometrical properties. It calculates the temperature profile through the panel as a function of time and uses the measured kinetic constants of t…
A small-break loss-of-coolant accident experiment conducted at the PMK-2 integral test facility in Hungary is analyzed using the RELAP5/MOD3.1 thermal-hydraulic code. The experiment simulated a 7.4% break in the cold leg of a VVER-440/213-type nuclear power plant as part of the International Atomic Energy Agency’s Fou…
Abstract The deformation of three types of sulfone polymers—polysulfone (PSF), poly(ether sulfone) (PESF), and polyarylsulfone (PASF)—was performed with a mechanical testing system (MTS). The result and samples were studied using a transmission electron microscope (TEM), a dynamic mechanical analyzer (DMA), and a diel…
The simultaneous influences of elastic stress and ionic fields on switching in ferroelectric liquid crystals are considered. Experiments are performed which show that the combined influences can be quite complex. When a reset pulse is applied, it can enhance or decrease the previous ionic field, as well as change the…
Orientational order parameters (OOP) in the smectic C and nematic phases of heptyloxyazoxybenzene (HAB) have been determined from x-ray diffraction and refractive index studies. Order parameters determined from x-ray studies have been corrected for the random orientation of the director in a cone in the smectic C phas…
A zirconium alloy getter-based tritium monitoring and collection system has been designed, built, and subsequently operated for three years at the Idaho National Engineering Laboratory. The system is automated to provide separation of tritium from 41Ar, collection of tritium on an hourly basis, unloading of getters fo…
Abstract Die Natriumcobaltchalkogenide Na 6 CoS 4 und Na 6 CoSe 4 sind durch isolierte [CoX 4 ]‐Einheiten charakterisiert. Trotz der großen Abstände der magnetischen Zentren von über 6Å führen bei tiefen Temperaturen magnetische Wechselwirkungen zu dreidimensional geordneten Spinstrukturen, die über Neutronenbeugungsu…
Abstract The behavior of PVC plastisols during gelation and fusion was studied by the ATR‐FTIR technique (Attenuated Total Reflectance‐Fourier Transform Infrared Spectroscopy). DBP, DOP, and DIDP, three common phthalate plasticizers for PVC, were used in plastisols formulations. Three heating rates—5, 10 and 15°C/min—…
Abstract Durch Schmelzreaktionen von Alkalicarbonat mit Cobalt und Schwefel im Wasserstoffstrom gelang die Darstellung der Verbindungen K 9 Co 2 S 7 , Rb 9 Co 2 S 7 und Cs 9 Co 2 S 7 . Die Struktur der Kaliumverbindung konnte über röntgenographische Untersuchungen an Einkristallen bestimmt werden (Raumgruppe P2 1 3, Z…
It is commonly known that the magnetostriction of grain oriented silicon steel for electric transformers, is strongly influenced by applied stress on the steel as well as coating stress of the steel and is dominated exclusively by the formation of 90/spl deg/ domain walls. A new concept on a condition for the formatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of Antiferromagnetic Heteronuclear Thiolate- and Sulfide-Bridged Complexes. 4. Synthesis of Triangular Clusters with CrRe2 and Cr2Re CoresIgor L. Eremenko, Sergei Nefedov, Heinz Berke, Boris I. Kolobkov, and Vladimir M. NovotortsevCite this: Organometallics 1995, 1…
Thin In46Sb54 films were prepared on glass substrates via flash evaporation. Films of 1000 Å were deposited at room temperature. After 7 min of thermal annealing at 450 °C, an average grain size increased from 20 to 200 nm. Under exposure to Fraunhofer diffracted pulsed Nd-YAG laser beam, the films exhibited different…
Abstract The increase of transmission at discrete frequencies (bleaching bands) is observed in porous silicon platelets pumped by picosecond laser pulses. It is attributed to a saturation of optical transitions between the energy levels of electrons and holes spatially confined within quasi‐zero‐dimensional (quantum d…
Pitting potentials, , and protection potentials, , have been determined for α‐brass (33% Zn) using a cyclic polarization method. Increasing the F − concentration shifts the critical potential to more active values. The pitting potentials, , and protection potentials, , depend on the logarithmic concentration of F − io…
Several studies have suggested that grafts from membranous derived bone (e.g., calvarial grafts) retain their volume better than those from endochondral derived bone (e.g., iliac bone grafts). Increased osteogenesis in grafts of the former type has been offered as the explanation. However, simple volume measurements o…
High-brightness blue and green light-emitting diodes (LEDs) based on II–VI double heterostructures (DHs) have been successfully grown by molecular-beam epitaxy (MBE) on (100) ZnSe substrates. These LED structures consist of a 500–1000 Å thick active region of undoped blue-emitting Zn0.9Cd0.1Se/ZnSe multiple quantum we…
A double dislocation pole model is proposed for deformation twinning in f.c.c. lattice structures. Operation of the twinning source proposed occurs when the passing stress that poses a high energy barrier to the nucleation and growth of a twin is surmounted by thermal activation. Orowan stress barriers are also involv…
Abstract The linear viscoelastic behavior of commercial broad‐distribution polypropylenes is studied. The samples underwent different controlled peroxide degradation rates, so they exhibit different molecular distributions. The relaxation spectrum is obtained by assuming that it takes the shape of a Log‐Normal distrib…
Room-temperature green luminescence has been studied in laser-modified (darkened) CdS nanocrystals with the average radii a ranging above the exciton Bohr radius (from 3.3 nm to 100 nm). Under high picosecond-pulse excitation, the electron-hole plasma decay kinetics exhibited a decrease of lifetime with decreasing cry…