Materials Literature
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The design of a double-negative metamaterial loaded microstrip transmission line (DNG MTM-TL) to tailor the propagation characteristics at S- and C-band frequencies is presented. Guided-wave propagation along this DNG MTM-TL was studied numerically. The scattering parameters of the DNG MTM-TL were obtained with Ansoft…
We will give a proof of the Gap Labeling Conjecture formulated by Bellissard, [3]. It makes use of a version of Connes ’ index theorem for foliations which is appropriate for foliated spaces, [11]. These arise naturally in dynamics and are likely to have further applications.
Abstract The thermal behavior of two clinoptilolites from an epiclastic and a pyroclastic deposit of central-northern Sardinia and of their exchanged forms (Li, Na, K, Cs, Mg, Ca, Sr and ammonium) were investigated by differential thermal analysis and thermogravimetry up to 1000°C. Their thermal stability was studied…
Abstract Bench scale performance based cone calorimeter investigations were conducted on glass fibre reinforced polyamide 66 (PA-66) and high impact polystyrene (HIPS) materials. Red phosphorus and magnesium hydroxide were used as fire retardants. Dilution, heat sink, barrier and charring mechanisms are considered to…
John R. Hughes, M.D., Thomas H. Brandon, Ph.D.; A softer view of hardening, Nicotine & Tobacco Research, Volume 5, Issue 6, 1 December 2003, Pages 961–962, http
The so-called direct solution of the powder diffraction pattern for a faulted layered crystal is discussed. It is shown how, in the general case, peak profiles can be split into a symmetric and an antisymmetric component. The relationships between peak profile parameters and the underlying faulting structure, as given…
Cure characteristics and physicomechanical properties of calcium carbonate,CaCO3, reinforced rubbers (NR, NBR) were studied. Minimum torque, maximumminimumtorque, cure rate and the scorch and cure time of the prepared rubbercompounds were assessed by using a Monsanto Oscillating Disc Rheometer (ODR-100). Stress and st…
Abstract Structural transformations between the different hydration states of three vermiculite samples from Sta. Olalla (Huelva, Spain), Paulistana (Piaui, Brasil) and West China, have been observed by X-ray diffraction at atmospheric pressure, P = 1.4 x 10 –2 mbar and P = 2.4 x 10 –4 mbar. The samples were studied i…
In the context of studies on long-time storage of irradiated spent fuel, molecular dynamics simulations have been carried out in order to understand the physical phenomena, on the atomic scale, linked to modifications and damage that the uranium dioxide structure undergoes during α-decay irradiation in repository cond…
Abstract This article provides a thorough analysis of the crystallization process of poly(butylene terephthalate) (PBT). Isothermal crystal growth rates have been experimentally measured between 459 and 491 K, and analyzed according to the Hoffman and Lauritzen theory. A II–III regime transition occurs at 484 K, accom…
This paper presents a new method of sizing the widths of the power and ground routes in integrated circuits so that the chip area required by the routes is minimized subject to electromigration and IR voltage drop constraints. The basic idea is to transform the underlying constrained nonlinear programming problem into…
Highly concentrated nanosized NiO particles have been prepared by means of vacuum evaporation of Ni on NH 2 -terminated poly(ethylene oxide) matrix film and subsequent purification by removal of a part of the matrix which was soluble in ethanol. TEM observation revealed that the purified composites contain uniformly d…
A novel, low‐temperature synthesis method for producing BaTiO 3 thin films patterned in the form of nano‐tubes (“honeycomb”) on Ti substrates is reported. In this two‐step method, the Ti substrate is first anodized to produce a surface layer (∼200–300‐nm thickness) of amorphous titanium oxide nano‐tube (∼100‐nm diamet…
The dc electrical conductivity of (100−x)Na2B4O7−xWO3 (x = 5, 15, 20 and 30 mol%) glasses is reported in the temperature range 323–473 K. The density and molar volume for these glasses are consistent with the ionic size, atomic weight and amount of different elements in the glasses. At high temperatures the Mott model…
A microcellular ceramic with cell densities >10 9 cells/cm 3 and cells <10 μm was made with a preceramic mixture of polycarbosilane and polysiloxane. The preceramic compact was saturated with gaseous CO 2 , a large number of cells were nucleated and grown by using a thermodynamic instability induced by a rapid p…
Abstract Published data of impact sensitivity of 33 polynitro compounds detected by sound were expressed as the drop energy, E dr , required for 50 percent initiation probability. A logarithmic relationship has been found between the E dr values and heats of fusion of the said compounds. The relationship has been foun…
We report the results of a series of density functional theory (DFT) calculations of the Mössbauer quadrupole splittings and isomer shifts in NO heme model compounds, together with the results of calculations of the Mössbauer quadrupole splittings, isomer shifts, and electron paramagnetic resonance hyperfine coupling…
High-quality phenyl-bridged organosilicas (p6mm) were prepared under acidic conditions using nonionic alkyl poly(oxyethylene) oligomers as structure-directing agents. In addition to the long-range order of the pore system, these materials exhibited a novel molecular order of the phenylene rings within the pore walls d…
The chalcogenide material used for phase-change applications in rewritable optical storage (Ge/sub 2/Sb/sub 2/Te/sub 5/) has been integrated with a 0.5-/spl mu/m radiation-hardened CMOS process to produce 64-Kbit memory arrays. On selected arrays, electrical testing demonstrated up to 100% memory cell yield, 100-ns pr…
To study the effect of oxygen partial pressure on grain growth in BaTiO 3 , TiO 2 ‐excess samples have been sintered in air with and without a prior H 2 heat treatment. Without prior H 2 treatment, abnormal grain growth occurs below and above the eutectic temperature ( T e ). An introduction of H 2 treatment before ai…