Materials Literature
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To clarify the mechanism of acicular ferrite formation in low carbon submerged arc weld metals of a Ti-B system with different aluminum contents, the lattice misfit between inclusion and acicular ferrite was investigated. The inclusions were directly sliced into thin foils by a focused ion beam device and crystallogra…
In this article, the rate of epoxy curing with two different accelerators, i.e., 1-imidazole (MI) and 1-dimethylbenzylamine (DMBA), is experimentally investigated. It has been found that the rate of MI-cured epoxy is higher than that of its DMBA-cured counterpart. Moreover, it has been observed that the Tg of MI-cured…
A total of 37 different soil samples and 22 air samples were collected from natural industrial sources. The air samples were collected at a height of 1 m above the ground on 10.4 cm diameter filter paper (with a desired collection efficiency) using a high-volume air sampler. The activity concentration levels of natura…
Parity‐violating electron scattering experiments aim to test the standard model of particle physics through precise low‐energy determinations of the weak mixing angle. These experiments require determination of the polarization of the incident electron beam to the 1% level or better. An example of this type of experim…
強制薄膜式リアクター（FTFR）を用いて，数～10 nmの銅フタロシアニン（Cu-Pc）ナノ粒子を作製するとともに粒子の表面処理を行った。手法には発煙硫酸に溶解させたCu-Pcを水に希釈することでCu-Pc粒子を析出させる方法を用いた。得られたCu-Pcナノ粒子の表面状態を，IRおよびXPSを用いて検討したところ，スルホ基の存在を確認した。さらにTOF-SIMSを用いてより詳細に検討したところ，Cu-Pcナノ粒子の表面にはスルホン化物が存在することを見いだした。さらに，表面にスルホ基が導入されたCu-Pcナノ粒子は有機溶媒中での分散性に優れていることを見いだした。これらの結果から，FTFRを用いるとCu-Pcナノ粒子の表面処理を均…
BaTiO3 - Ag composite nanopowders were synthesized via microemulsion mediated synthesis through the hydrolytic decomposition of mixed metal alkoxide solutions as precursor for the BaTiO3 and the reduction of silver nitrate in the presence of polyvinylpyrrolidone (PVP) as source for the Ag nanoparticles. The X-ray diff…
A remote welding machine for a DUPIC (Direct Use of spent PWR fuel In CANDU reactors) bundle fabrication was designed to establish the optimum welding processes in a hot cell environment. An initial investigation for hands-on fabrication outside the hot cell was performed in the consideration of the constraints of wel…
我が国にとって貴重な資源であるフッ素を，カルシウム吸収材を用いて排ガス中から乾式で再資源化する技術を開発している．カルシウム吸収材の種類，粒径，反応温度をパラメータとして，フロン分解ガスと低温で気固反応させる時の反応特性を調べた．HF濃度が約30%，HCl濃度が約15%の反応ガスをHCFC22の熱分解により得た．吸収材の粒径は1–2 mm，2–4 mmの2種類を用い，反応温度を473–673 Kの範囲で変化させた．この場合の空塔速度は4–6 cm/s，空間速度（SV）は1600–2300 h−1の範囲となる．各反応条件に対する炭酸カルシウムと酸化カルシウムのフッ素回収率は各吸収材の反応特性に大きく依存し，CO2の発生を伴うフッ素化…
Thermal conductivity of (5,5) and (3,3) carbon nanotubes with Stone-Wales (SW) defects is investigated by molecular dynamics simulation. Non-equilibrium molecular dynamics method is employed and the reactive empirical bond order potential is chosen. In the simulation, the temperature difference is given by applying th…
In the present study, multilayer TiN/CrN coatings at different bilayer thicknesses have been deposited on silicon (100) and 316 stainless steel substrates using reactive DC magnetron sputtering technique. Nanoindentation, nanoscratch and ball-on-disk tribometer tests were used to characterize the films. Nanoindentatio…
The multi-pulse orbits and chaotic dynamics of the simply supported laminated composite piezoelectric rectangular plates under combined parametric excitation and transverse loads are studied in detail. It is assumed that different layers are perfectly bonded to each other with piezoelectric actuator patches embedded.…
The structure of compact bone is heterogeneous and as such, is difficult to shape by cutting tools during clinical surgical practices. The structure of bone can have a devastating effect on the performance of the cutting tool unless it is coated with a thin solid film that is wear resistant. The paper investigates the…
Dynamic mechanical analysis (DMA) experiments have been performed on rigid polyurethane (PU) foams using a torsional rheometer. Circular disk samples were tested at several frequencies between 1-2,000 cpm and at temperatures between 25°C-150°C. The dynamic torsion tests were carried out in two phases. In the first pha…
Resumo: Este trabalho descreve as ações e os resultados alcançados na otimização do processo de obtenção do pré-polímero MetilAzoteto de Glicidila (GAP). Foram obtidas amostras de poliepicloridrina (PECH) utilizando três diferentes catalisadores, BF3, SnCl4.5H20 e SnCl4 anidro, sob diferentes condições e cada amostraf…
La production europeenne des esters methyliques d’huiles vegetales (EMHV), biocarburant destine a la consommation des moteurs diesel, est aujourd’hui en plein essor. Cet essor s’accompagne d’un accroissement des quantites disponibles de glycerol, principal sous-produit de fabrication de ce biocarburant. Dans ce contex…
Highly transparent, luminescent, chemically pure and biocompatible zinc oxide (ZnO) nanoparticles (NPs) without any surfactants were synthesized by liquid phase- pulsed laser ablation (LP- PLA) of sintered ZnO pellets. Transmission electron microscopic study confirms the formation of crystalline ZnO nanoparticles. The…
A study was conducted to examine the energy transfer from a reacted thermite placed on a steel target substrate. A high speed infrared camera captured a temporally evolving thermal distribution on the substrate, while the thermite, which was placed in a v-notch, self propagated. The thermite investigated for this expe…
In this paper, the fabrication method of high aspect ratio tapered structure is proposed by using chemically-amplified epoxy-based negative resist SU8. Proximity exposure technique is used from the backside of 150μm thick glass substrate to change the amount of exposure by using conventional mask. The amount of exposu…
Changes in the concentration of four polystyrene samples in solution in carbon tetrachloride caused by their interaction with mesoporous glass particles were measured at 298 K. Polystyrene samples with weight-average molecular weights of 8940, 57400, 187000, and 1500000 Da were used. One-constant Carman-Haul kinetic e…
Increase of power densities has become the primary constraint for semiconductor industry to sustain the Moore’s law for microprocessor evolution. Further development of packaging technology and advanced thermal interface materials (TIMs) requires both maximization of the total thermal throughput of the system and miti…