Materials Literature
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We investigated the thermal characteristics of Cu/low-k interconnects to suppress the impact of Joule heating (JH) on electromigration. The thermal time constants in multilayered Cu/low-k interconnects were experimentally investigated for the first time on the basis of the transient thermal response. Furthermore, we a…
速度論に基づいた高pH溶液中へのCO2ガス溶解モデルを構築し，実験的・数値解析的な検証を行なった．アルカリとしてNaOHを用いた模擬細孔溶液，および固相物質としてCa(OH)2を加えた模擬細孔溶液中へのCO2の溶解に関して，構築した溶解速度モデルを適用して数値計算を行った結果，pH等の実験値の挙動を概ね再現することができた． 一方，気相に接する液相要素が瞬時にCO2の溶解平衡に達するとの仮定に基づいた平衡モデルと，溶解速度モデルとの数値計算結果の比較を行なった結果，気相のCO2濃度が低くなり実環境条件に近づくほど平衡モデルにおける仮定は成立しなくなり，実環境条件において CO2の溶解プロセスを律速しているのは拡散速度ではなく，溶解…
For the first time, we find that the dynamic antiferromagnetic phase present in CeFe2 gets stabilized with Ga and Si substitutions. We find that phenomena such as strain-induced first order jumps in the magnetization curves, asymmetry between the M-H curves during the increasing and decreasing field cycles, the envelo…
D.c. conductivity σ and thermal degradation measurements on PEDOT:PSS films of different thicknesses d = 50, 120 and 180 nm are reported. The experimental results are consistent with a hopping type carrier transport. For the films with thickness d = 50 nm, which consist of almost one single layer of PEDOT:PSS conducti…
Hydrogen peroxide was found to oxidize 1 -phenylethanol to acetophenone in acetonitrile homogeneous solution efficiently at room temperature in the presence of a dimeric complex of manganese (IV) [LMn(O) 3 MnL](PF 6 ) 2 (where L = 1,4,7-trimethyl-1,4,7-triazacyclononane) as the catalyst and oxalic acid as a co-catalys…
We derive error estimates for finite element discretizations of phase field models that describe phase transitions in nonisothermal mixtures. Special attention is paid to the applicability of the result for a large class of models with nonlinear constitutive relations and to an approach that avoids an exponential depe…
To develop hydrogen energy, it is important to understand the effects of hydrogen on mechanical properties in all applications — production, transportation, storage and fuel cells. Although a considerable amount of work has been carried out on hydrogen related embrittlement, there is comparatively less work on the eff…
In order to form the necessary data base on platinum and platinum metals, certain tests were carried out on platinum samples of different purity of 99.5%, 99.9% and 99.99%. The degree of cold deformation, annealing temperature and chemical assays were tested as well as their impact on the mechanical properties of plat…
Heterogeneous nucleation of water plays an important role in wide range of natural and industrial processes. Though heterogeneous nucleation of water is ubiquitous and everyday experience, spatial control of this important phenomenon is extremely difficult. Here we show, for the first time, that spatial control in the…
Spironaphthoxazines (SPO) are well-known photochromic compounds of interest from the viewpoint of fundamental elucidation of photochemical switches and potential applications in optical memories. This paper reports on the conductivity switches, viscosity switches, fluorescence switches and gel switches of SPO. In addi…
We have performed ESR measurements on a single crystal of the spin crossover complex [Mn III (taa)]. Symmetry lowering due to the Jahn-Teller effect in the High spin state of [Mn III (taa)] is detected by the ESR measurements. From the analysis based on a spin Hamiltonian, we discuss the distortion in the molecular st…
Fouling of processing equipment in general and food processing equipment in particular is a global issue that results in billions of dollars in clean-up and other related expenses such as loss in productivity, increased energy input, and pollution to the environment. Reports indicate that in the US alone total costs o…
Resumo: Embora a composição química seja a mesma, as propriedades físico-químicas dos polimorfos podem ser totalmente distintas, como, por exemplo, a condução ou não de eletricidade. Discute-se até mesmo a legalidade de reconhecê-los como produtos totalmente novos, dadas as características próprias que um polimorfo po…
In the present study, the effect of cobalt oxide on the densification of Al2O3-YAG composite nanopowder was investigated. An amorphous nanopowder was synthesized and crystallized to Al2O3-YAG after heat-treatment via a solid-state reaction. The average particle size of heat-treated powder at 800?C was about 80 nm. Cob…
Transient control is important for prolonging the life of SOFCs and broadening their applications. This paper develops an observer based method for transient control. The essential idea is to regulate the fuel cell current using the estimated state, incorporated within a steady-state invariant property of the SOFC. Th…
Within alumina particle suspension yttria precursor was precipitated with ammonium carbonate. Drying and calcination at 600?C resulted in the mixture of alumina and yttria particles, the latter being much finer than alumina particles. This mixture was additionally homogenized by short attrition milling in aqueous susp…
We measured the viscosity and the refractive index of the binary tellurite glasses and melts, (M2O-TeO2 M=Li, Na and K), and investigated the thermal and compositional dependences of the properties. It was found that the viscosity and the refractive index of the binary tellurite melts decreased with increasing tempera…
In order to remedy defects of thin electrolyte films, which significantly affect the power generation performance of solid oxide fuel cells (SOFCs), the effects of pre-sintering of raw material powder (8 mol % Y2O3-stabilized ZrO2: YSZ) on the properties of the electrolyte were investigated. After pre-sintering YSZ po…
This experiment aims to produce a free radical while annoying the oxidizing‐reducing reagent of the ammonium persulfate and the sodium bisulfite under nitrogen, then trigger copolymerization between modified‐mica and chitosan to prepare a variety of copolymers. This experiment also aims to study the related properties…
Torsion extrusion was carried out on Mg-3Al-1Zn-0.5Mn-1.5Ca (in mass%) alloy (AZ31+1.5Ca alloy). The annealed torsion-extruded AZ31+1.5Ca alloy exhibited higher elongation compared with the annealed extruded AZ31+1.5Ca alloy without torsion. The ductility enhancement was attributed to a unique texture with 〈10\\bar10〉…