Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
We present an analytical formulation that shows the negative refraction of propagating waves and the growth of evanescent waves within a negative refractive index (NRI) lens made of a periodically L, C loaded transmission-line (TL) network, referred to as the dual-TL structure. A transformation known as the "array sca…
Silica-supported silver nanocomposites were synthesized by rf sputtering of Ag from Ar plasmas. Depositions were performed on amorphous silica substrates at temperatures as low as 60 °C. As a general rule, a careful choice of the synthesis conditions allowed the obtainment of Ag/SiO2 nanosystems with well-tailored che…
Methods of suppressing decreased conductivity in 8 mol% Y 2 O 3 ‐stabilized–92 mol% ZrO 2 (8YSZ) with aging were investigated. Different amounts of Sc 2 O 3 were doped into 8YSZ. The electrochemical properties of Sc 2 O 3 ‐doped 8YSZ were measured, and the microstructural and local structural changes were characterize…
Airdecking is used in mining for two quite different applications. One is to enhance the fragmentation by amplifying the induced fracturing and the second is for pre-split blasting in which the borehole fracturing is reduced. This paper deals with the first of these effects. A forth coming paper will describe pre-spli…
geology, crystal structure, sulfosalts, complex sulfides
The thermal conductivity of polycrystalline Al‐doped ZnO was controlled through the fabrication of nanostructured polycrystalline materials, by hot‐pressing nanosized Zn 1– x Al x O ( x = 0.01, 0.02) particles, which were synthesized by a coprecipitation and spray‐drying method. This process resulted in an improved th…
Metal and metal-oxide based nanosystems are intriguing candidates for a plethora of advanced applications thanks to their diversified chemico-physical properties, that can be further tailored by the use of proper synthesis procedures. Among the different preparation techniques, chemical vapor deposition (CVD), rf sput…
α(6 H )‐ and β(3 C )‐SiC powders were sintered with the addition of AlB 2 and carbon. α‐SiC powder could be densified to ∼98% of the theoretical density over a wide range of temperatures from 1900° to 2150°C and with the additives of 0.67–2.7 mass% of AlB 2 and 2.0 mass% of carbon. Sintering of the β‐SiC powder requir…