Materials Literature
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The microstructure, martensitic transformation temperatures and shape memory properties of Co-Si binary alloys were investigated by means of optical and transmission electron microscopy, differential scanning calorimetry and a shape memory test. The ε martensite phase with a hexagonal close-packed (hcp) structure was…
The direct synthesis of phenol by hydroxylation of benzene with hydrogen peroxide over a vanadium substituted heteropolymolybdic acid catalyst was investigated at 70 ?C. Hydrogen peroxide was used as the oxidant while 36 wt.% acetic acid was employed as the solvent. After 100 minutes, the selectivity for phenol was 93…
A solid membrane of poly(2-ethylhexyl methacrylate-co-vinylpyridine) containing photochromic 6′-nitrospiropyran was prepared. In the rubbery copolymer membrane (Tg = −9 °C), the merocyanine (MC) form of the spiropyran isomerized into the spiro (SP) form by thermal decay after irradiation with UV light. The resulting d…
The present international socio-economic drive for renewable energy use for sustainable development with environmental protection directs attention to hydrogen as energy carrier. Hydrogen production and storage, and fuel cell (FC) technologies have been intensively worked on in Europe including European Commission (EC…
Abstract The state and dispersion of Pt supported on MFI catalysts with different contents have been studied using Fourier transform infrared (FTIR) spectroscopy. Experimentally predicted Pt‐containing complexes were simulated by density functional theory (DFT) for CO frequency shift estimation and determination of th…
The macrosegregation process takes place during typical solidification of alloys. Fractions of alloy components in a liquid and solid sub-domains are time-dependent and determined by the course of border lines on the equilibrium diagram. From the mathematical point of view, the process is described by a system of part…
わが国では, 昭和63年に世界に先駆けて原子力委員会による「群分離・消滅処理技術研究開発長期計画」(通称 : オメガ計画) が策定され, 分離変換技術の研究開発が進められてきた。この間, 分離変換技術の導入については様々な提案がなされている。しかし, その導入効果については, 長寿命核種の半減期短縮や, 高レベル放射性廃棄物 (HLW) の毒性低減などが主張されているのみであった。分離変換技術の研究開発を将来の実用化に向けて促進するには, 燃料サイクルや廃棄物処理・処分の安全性, 経済性, 社会的受容性などに関わる具体的な利点を示していく必要がある。そのためには, 関連する幅広い専門分野の研究者・技術者が協力して, 定量的・客観的…
We take advantage of the precise determination of the crystallographic structure of complex magnetic systems with localized moments to calculate their exchange interaction values using ab initio methods. The magnetic interactions are mapped onto a Heisenberg model whose exchange interaction terms are fitted to first-p…
In this research work, an attempt has been made to study the behavior of medium voltage stator bar specimens that are subjected to steep-front pulse voltage waveforms by using infrared thermography. In this regard, an accelerated aging test is developed by using electrical and thermal stress conditions. The test condi…
We review recent research activities on catalyst-free growth of ZnO nanorods and their nanodevice applications. Since ZnO nanomaterials add excellent chemical sensing characteristics due to their large surface-to-volume ratio to intrinsic ZnO properties including semiconducting and piezoelectric properties, a wide dir…
The first example of supramolecular metallomesogens derived from palladium complexes exhibiting columnar phase is reported, and the formation of the mesophase is induced by H-bonding in a tetrameric assembly.
Applications of ultrasound in cleaning industry and biomedical field are owed to acoustic cavitations. To investigate behaviors of acoustic cavitations, a standing wave field of piston ultrasonic radiation was set up in this paper. And the behaviors of acoustic bubbles in this standing wave field were studied experime…
First-principles electronic structure calculations have been performed for defect and magnetic structures in FeCo. The compositional dependence curves both of formation energies and lattice parameters are obtained by calculations employing supercells of various sizes. The vacancy formation energies are calculated with…
The electron and hole conductivity of solid solutions was measured by dc polarization method using a modified Hebb–Wagner's ion blocking cell at 973, 1073, 1173, and as a function of oxygen partial pressure. All measured data were fitted to the sum of the electron conductivity having a dependence and the hole conducti…
Novel piezoelectric actuators (stack actuator and flextensional actuator) and ultrasonic motors are presented for cryogenic actuations utilizing the excellent cryogenic properties of recently invented single crystal piezoelectrics (PMN‐PT and PZN‐PT crystals). Single crystal piezoelectrics exhibit large increases in s…
The present paper reports the preparation of non-oxide ceramic fibers through the Polymer-Derived Ceramics (PDCs) route. The poly[B-(methylamino)borazine]-derived boron nitride (BN) ceramic fibers and modified C-B-C-bridged polysilazanes-derived silicoboron carbonitride (SiBCN) ceramic fibers were used as models. The…
Based on the molecular dynamics method and improved reactive empirical bond order potential, Green-Kubo function is used to calculate the thermal conductivity of carbon nanotube. The overlapping method is used which shortens the simulation time greatly. The result shows that the most significant contribution to the th…
Ceria (CeO 2 ) nanowires have been successfully synthesized by a sonochemical method in ambient air and alkali aqueous solution from CeO 2 nanoparticles without using any templates. The results showed that both alkali concentration and ultrasonic irradiation played critical roles in the formation of the nanowires. The…
Purpose: The purpose of this procedure is to standardize the procedure for the X-ray diffraction measurements of lattice parameters and crystallite sizes of carbon materials. This specification is expected to be used to characterize the structure not only in research laboratories but also in companies producing and us…
Linear acoustic pressure field is obtained by solving the homogenous Helmholtz equation using FEMLAB package (COMSOL Multi-physics 3.2b). The pressure field is used to calculate the collapse pressure of the transient cavitation bubbles by using the cavity cluster approach (1). The regions where the local pressure exce…