Materials Literature
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The case study on cooling pipe of pre-cooler, which had been used on a verification test of 70 MPa hydrogen station, was carried out. Cooling pipe consisted of main pipe, mechanical joint pipe and mechanical joint. Main pipe and mechanical joint pipe were joined by TIG welding. Chemical composition analysis, microstru…
トリアジン骨格を有する三官能性モノマーと1,2,4,5-テトラフルオロベンゼンおよび1,3,5-トリフルオロベンゼンの直接的アリール化重縮合をN,N-ジメチルアセトアミド中あるいはトルエン中でそれぞれの最適反応条件において行うことにより，含トリアジン–フルオロアレーンネットワークポリマーの合成を行った．得られた高分子はあらゆる溶媒に不溶であることから，固体NMR法により構造解析を行った．各ネットワークポリマーの窒素吸脱着測定を行ったところ，それぞれにおいてマイクロ孔を有する共役系マイクロポーラスポリマー(CMP)であることがわかった．興味深いことに，モノマーの組合せのみならず，反応に用いる溶媒によって得られるネットワークポリマーの…
The purpose of this study is to develop a method for quantifying the fluidity of flowable resin composites using determinations of yield stress. Five commercially available composites (AliteFlo LV, Flow-it ALC, Venus flow, Tetric N-flow, Revolution Formula2) were investigated. Yield stress values were obtained by plot…
パラジウム(Pd)触媒クロスカップリング反応は，π共役系高分子合成法の発展に寄与してきた．たとえば，アレーン(Ar)間の炭素–炭素(C-C)結合形成反応であるStilleクロスカップリング(Ar-SnR3+Br-Ar)や鈴木–宮浦クロスカップリング(Ar-BR2+Br-Ar)は，多彩なπ共役系高分子設計を実現してきた．一方，直接的(C-H)アリール化と呼ばれる炭素–水素(C-H)結合の切断を伴うクロスカップリング反応(Ar-H+Br-Ar)は従来法と比べて試薬の入手が容易であり，原子利用効率が高く，有機金属副生成物が生成しないなどの利点をもつことで，π共役系高分子合成法として近年注目されている．しかし，反応効率，反応位置選択性，モ…
Separation of CO2 using adsorption and membrane separations can be performed under moderate conditions for carbon capture and release processes. Although porous media work well for this purpose, these novel materials must be fabricated with high CO2 separation ability. We propose the use of nanoscale BaTiO3 crystals a…
Co-rich Nd-Fe-B nanocomposite ribbons with Tb substituted have been fabricated by single roller melt spinning technique of Nd4-xTbxFe83.5Co5Cu0.5Nb1B6 (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) alloys in an argon (Ar) atmosphere at a circumferential speed of 40 m/s. According to the differential scanning calorimeter (DSC) trac…
In this work, the effect of BaTiO3 (BT) addition on structural, dielectric and electrical properties of CaCu3Ti4O12 (CCTO) ceramic was investigated.Ceramic samples with the chemical formula (1-x)CaCu3Ti4O12 -xBaTiO3, (1-x)CCTO-xBT, (x = 0.00, 0.10, 0.20, 0.30, 0.50 and 1.00) were synthesized by solid state route.The s…
New generation superalloys based on Ni intermetallics exhibit high thermomechanical stability at high temperatures and are widely used in modern industry. The production of such materials by self-propagating high-temperature synthesis (SHS) has an advantage over traditional metallurgical production methods due to reac…
Utility of hetero-polyacid salt based composite cation exchanger polyaniline-zirconium telluro tungstate (PANI-ZrTeW) synthesised by co-precipitation method as solid acid catalyst for sucrose inversion was analysed. Ion exchange capacity, pH titration, thermal stability were investigated to explore ion exchange behavi…
This paper presents experimental results of vertical loading using an atomic force microscope (AFM) performed on a thin film consisting of nickel helical nanoelements (nanosprings) formed by glancing angle deposition (GLAD) technique. As a helical element has large reversible deformation limit in general, a characteri…
The CO2, air, oxygen and special gases effluence and contamination in compressed gas cylinders during storage and transportation resulting into localised pitting corrosion of the storage and conveying metal is a major challenge in oil and gas sector. In an attempt to address this, the inhibition influence of Ketoconaz…
大気中光電子収量分光法は，試料にエネルギーを変えながら紫外線を照射し，放出される光電子数をオープンカウンターで測定する手法である．オープンカウンターは大気中で動作するので，大気中での物質の電子状態を反映した結果が得られる．近年，著者らは，大気中におけるその場観察の新たな可能性を引き出すことに取り組んできた．本総合論文では，最近の成果である，1）金属表面の仕事関数のその場観察，2）飲料の光電子放出特性，について紹介したい．
A new simultaneous measurement method for the measurement of the three thermoelectric properties with a film-type thermocouple probe was proposed. Seebeck coefficient was measured using the steady-state condi-tion of the differential method. The electrical resistivity was measured us-ing the four-probe method and the…
Here we report the preparation of nitromercurated styrene butadiene rubber (NMSBR)/silver doped zinc oxide nanocomposite by inexpensive and ecofriendly two roll mill mixing. The composites were characterized by UV, FTIR, XRD, SEM, TGA and conductivity measurements. UV and FTIR spectrum indicated the interfacial intera…
The thermoelectric effect, i.e., appearance of thermally stimulated current and voltage during uniform heating in a temperature range from 30 to 250°C, is studied. It is shown that greatest values of the current and voltage appear when maximum band gap difference is observed.
FM-52M, a kind of filler metal matched for Inconel 690, is widely applied in critical components of nuclear power plant. In this work, the effect of the microstructure refinement of FM-52M was studied through pulse TIG welding. First, a serial of bead welds under different welding parameters were conducted to elucidat…
本文利用第一性原理对单个Si原子掺杂石墨烯结构的电子性质进行了计算模拟研究。结果表明，该体系的原子间杂化成键状态倾向于sp2-sp3混合杂化，原子排列出现了褶皱，石墨烯原有的空间反演对称性破缺，使得石墨烯能带结构中的狄拉克锥的零能隙打开。通过投影能带发现，掺杂Si原子在狄拉克锥附近的贡献较小，其主要影响是改变体系的杂化成键状态使体系几何结构发生改变，进而导致体系的电子性质发生变化。 By using first principle calculations, we have investigated electronic properties of single Si atom doped graphene. The result…
The magneto-dielectric properties of ferromagnetic-ferroelectric (FM-FE) composites synthesized by using Mn-Zn ferrite and BaTiO3 (BTO) nanoparticles are reported in this work. The X-ray diffraction analysis of the composites show the existence of FM and FE phases. The field emission scanning electron micrographs (FES…
Organizational-and-technological design is considered to be a significant section of structural design in terms of its content and complexity. The processes of formating and automating the organizational and technological documentation in construction have their own specific features. In recent years leading Western a…
Natural fiber reinforced composites (NFRC) are used in several applications because of their good specific properties, eco-friendly characteristic and low cost. Moreover, due to the viscoelastic behavior of natural fibers, NFRC could present high damping capacity that is an important characteristic required in several…