Materials Literature
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Graphene is a hexagonally bonded sheet of carbon atoms that exhibits superior transport properties with a velocity of 108cm∕s and a room-temperature mobility of >15000cm2∕Vs. How to grow gate dielectrics on graphene with low defect states is a challenge for graphene-based nanoelectronics. Here, we present the g…
We report on Coulomb blockade and Coulomb diamond measurements on an etched, tunable single-layer graphene quantum dot. The device consisting of a graphene island connected via two narrow graphene constrictions is fully tunable by three lateral graphene gates. Coulomb blockade resonances are observed and from Coulomb…
Disclinations were first observed in mesomorphic phases. They were later found relevant to a number of ill-ordered condensed-matter media involving continuous symmetries or frustrated order. Disclinations also appear in polycrystals at the edges of grain boundaries; but they are of limited interest in solid single cry…
Using first-principles calculations, we predict a novel stable boron sheet and boron nanotubes which show various electronic properties. The boron sheet is flat and has the structure that the two centers of each three hexagons in the hexagonal lattice are filled with additional atoms, which preserves the symmetry of t…
This paper presents a new artificial neural network approach based on loss separation model to compute power loss on different types of electrical steels. The network was trained by a Levenberg-Marquardt algorithm. The results obtained by using the proposed model were compared with a commonly used conventional model.…
Partial isothermal sections of the Al-Pd-Ru phase diagram at 1000 and 1100C are presented. The Al-Pd orthorhombic -phases dissolve up to ~15.5 at.% Ru, Al 13 Ru 4 <2.5 at.% Pd and Al 2 Ru up to 1 at.% Pd. Between 65 and 80 at.% of Al ternary quasiperiodic icosahedral phase and four cubic phases were revealed. An addit…
Advanced 700 ℃ class steam turbines require using Ni-based superalloys instead of conventional ferritic 12Cr steel which is insufficient in creep strength and oxidation resistance above 650 ℃. The superalloys, however, possess quite higher coefficient of thermal expansion (CTE) than the 12Cr steel. So far authors exam…
Present electrical devices have large calorific power, then improvement of heat dissipation has been a very important subject. We developed the novel epoxy resins which increased the thermal conductivity that has been a barrier to heat dissipation. The medium of thermal conduction for insulating resins is phonons. Pho…
The lecture will outline the selection of a cable system, from conductor, dielectric and protection system through to installation method and choice of accessories, identifying factors that will influence each choice. It will then indicate modern trends in on-line monitoring of cable systems for performance and integr…
Development of adhesive as well as anti-adhesive surfaces is necessary in various biomaterial applications. Cell behaviour on adhesive substrata is well documented, whereas very little is known abo...
This paper investigates the performance of conventional current transformer for online partial discharge detection in high voltage cables. It is based on the frequency response of such current transformers. The frequency behaviour was investigated using a simulation package (Powersim) by varying parameters including c…
This paper describes a novel method of nanowire assembly using a superhydrophobic surface as a template. Well-defined superhydrophobic structures on a template surface direct the site-specific self-assembly of nanowires due to interfacial tension in evaporation, enabling simple but highly-efficient and ordered assembl…
In this study molecular dynamic (MD) simulations are performed to study the interfacial thermal resistance between a nanofin and a working fluid. A (5, 5) carbon nanotube (CNT) of diameter 6.78 Å and various lengths are immersed in different fluids in these analyses. For this simulation the total numbers of the fluid…
Different multi-level [G2, G3, G2M(CC5)] and DFT-based (B3LYP, MPW1B95, and MPWB1K) techniques were tested for the calculations of the gas-phase formation enthalpy of nitrometanes as well as C-N bond dissociation energies of these species. The calculated values of the formation and reaction enthalpies were compared wi…
Modification of polymer surfaces by cold plasma processes is attracting a growing interest. Especially, the use of plasma gases such as N2, O2 or air, which are cheap and environmentally safe, is very attractive from an industrial point of view. The lifetime of atomic oxygen being very short, it is very difficult to o…
The elastic continuum model is resorted to study the lattice specific heat of individual crystalline silicon nanowires with 22 and 37 nm in diameter. Incorporating both longitudinal and transverse modes, a model based on the power-law phonon dispersion is developed to illustrate the characteristics of phonon density o…
溶液中の３価の金属イオンによるKDP(KH2PO4)結晶への成長速度抑制効果はよく知られている。この金属イオンが結晶表面に吸着するとき、結晶成長を阻害する。また、我々の最近の研究では、キレート剤の添加により、この金属イオンの成長速度抑制効果が緩和され、成長速度が回復することが知られている。しかし、これらのメカニズムは理論的に明らかにされていない。さらに、種々の染料がKDP飽和溶液に添加剤として加えられると、選択的に結晶の異なる面を着色する。この選択性や配向性も同様に未解明のままである。そこで、今まで実験的に知られているKDP結晶成長に関する各種添加剤の影響を計算化学によって明らかにし、静電ポテンシャルによってこれらの現象が説明でき…
For development of mixed conductors, we synthesized BaIn1-xMxO3-delta (M= Ti, V, Cr, Mn, Fe, Co, Ni, or Cu) by substitution of transition metals for indium. The BaIn1-xMxO3-delta has orthorhombic, tetragonal or cubic structure depending on the kind and amount of the transition metals at room temperature. The structura…
Frequency dependences of dielectric constant (epsilon r'), electrical conductivity and weight change were investigated for the perovskite-type oxide system BaCe1-xYxO3-delta (x=0.05~0.l5), which is a typical proton conductor. The sample with x=0.15 showed the maximum values in both proton conductivity and water conten…
The thermal properties of microelectromechanical systems (MEMS) devices are governed by the structure and composition of the constituent materials as well as the geometrical design. With the continued reduction of the characteristic sizes of these devices, experimental determination of the thermal properties becomes m…