Materials Literature
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To study in detail the nature of the advancing solid/liquid interface, thin specimens of the binary eutectic alloys Bi-Pb2 Bi and Bi-Sn were solidified at various low speeds (5.7–115 nm S−1) and quenched to form a representative interface for subsequent examination. Both eutectic alloys were found to be of the faceted…
The optical properties of amorphous-diamond films prepared by a mass-separated ion beam are studied and compared with the shape of the corresponding Raman spectra. The Raman measurements with moderate spatial resolution indicate that the films possess the sp3 fraction distributed along the film surface, the thinner ed…
A study has been done on the mechanical properties of poly vinyl chloride/ethylene vinylacetae (PVC/EVA) polymer blends filled with stearic acid coated calcium carbonate (Forcal-S). Both impact strength and stiffness of the composites are optimized by varying EVA and filler (Forcal-S) contents. The results show that t…
Oil-in-water emulsions stabilized by kaolinite clays were demulsified by the addition of fresh oil under the action of mixing in a continuous mixer−settler setup. The clays were treated with different concentration of asphaltenes, resulting in clays having different contact angles. It was found that the variation of t…
thin films prepared by a solution‐deposition process were formed at various annealing temperatures. P‐E hysteresis loops of the films exhibited well‐defined shapes, and the leakage current decreased with increasing annealing temperature except for one annealed at 750°C. The considerable amount of metallic Bi on the fi…
Using a continuum model of Ericksen and James, we compute a number of fine scale structures commonly observed as a result of martensitic phase transformations. Our results provide numerical validations of the Ericksen--James model. We show that care is needed in the discretization stage if spurious microstructures are…
A new reduced-order model (ROM) is proposed for the bulk-controller presented in Part I. This model considers convection in the melt based upon the assumption of an idealized flow geometry consisting of horizontal donuts and vertical tubes with radial and axial dispersion, respectively. Boundary and bulk layers are as…
Abstract The temperature dependences at 110 to 400 K of the : 1 H spin-lattice relaxation time (7\) of the phenethylammonium ion in phenethylammonium lead(II) halides, [C 6 H 5 CH 2 CH 2 NH 3 ] 2 PbX 4 (X = Cl, Br, I), revealed that this ion shows reorientation of the NH 3 moiety around the three-fold axis and torsion…
Transmission electron microscopy and scanning electron microscopy offer evidence that the purely chemical HF:HNO3:H2O “stain etch” used to form light-emitting porous silicon is actually composed of competing etches. A localized etch forms the porous nanostructure by propagation of a discrete reaction interface into th…
The mechanical response and failure behavior of Epon 828/T-403 epoxy were experimentally obtained over a strain rate range of 1.7 × 10−5 to 4.7 × 103 s−1 and a temperature range of −190 to 100°C. Compressive loads were applied in both uniaxial and multiaxial manners. A modified split Hopkinson pressure bar was employe…
Radiation-cooled rockets are used for a range of low-thrust propulsion functions, including apogee insertion, attitude control, and repositioning of satellites, reaction control of launch vehicles, and primary propulsion for planetary space- craft. The key to high performance and long lifetimes for radiation-cooled ro…
Electronic properties of passive layers grown anodically on Al 7075 (UNS A97075) in chromate and oxalate solutions during polarization at 500 mVSCE were investigated using electrochemical impedance spectroscopy (EIS). Impedance results were analyzed in terms of capacitance-vs-frequency plots during reverse polarizatio…
In the present work the effect of incident laser power on the Raman spectra of diamond isolated particles and continuous films deposited on silicon and glassy carbon (GC) substrates by the chemical vapor deposition method is investigated. It is shown that the Raman line position measured for diamond particles shifts t…
Abstract This paper analyses the causes of the premature failure call welded AISI 316L stainless steel (ss) pipes which formed part of a sea water cooling circuit. The service time of the pipes was 8 months. The laboratory tests carried out consisted of metallography tests, δ‐ferrite determination, intergranular corro…
A pressure-induced phase change in the title compound involving a Jahn−Teller switch is observed at an applied pressure of ∼200−250 bar at room temperature by both neutron diffraction and EPR spectroscopy. The transition reverses upon lowering the pressure with a hysteresis of about 100 bar. The single-crystal EPR spe…
This paper describes numerical analysis of the PHEBUS FP containment thermal-hydraulics. PHEBUS FP is an international project undertaken with the aim of evaluating the behavior of radioactive fission products released from a LWR pressure vessel into the containment vessel during a hypothetical severe accident. Six in…
The ferroelastic deformation of t ‐ZrO 2 , the microstructure of which was described in detail in Part I, was investigated by in situ deformation experiments in the high‐voltage electron microscope at 1150°3C. During the experiments those two domain variants with their c‐axes perpendicular to the [010] tensile directi…
Attempts were made to improve the adhesion and strength properties of a copper clad thermotropic liquid crystalline polymer (LCP) for use in advanced printed circuit board (PCB) applications, through manipulation of processing/laminating conditions. Two types of copper foil were investigated. Most significantly, it wa…
The crystal structure of form II of syndiotactic poly(1-butene) is presented. According to the present analysis, chains having a s (5/3)2 helical conformation are packed in a monoclinic unit cell with axes a = 15.45 Å, b = 14.36 Å, and c = 20 Å and with γ = 116° The crystalline density is 0.933 g/cm 3 with four chains…
Photoluminescence spectra of thin-film aluminium oxide samples on aluminium show spectral lines at ca. 330 and 420 nm that are attributed to the F + and F centers of aluminium oxide, respectively. Experimental results reveal that the F centers are responsible for the intrinsic cathodic luminescence of an oxide-covered…