Materials Literature
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In a interesting letter, Xiao et al. interpreted experimental results on the failure of nanotube bundles using Weibull Statistics. The prediction of the force versus strain curve was smooth. Nevertheless, abrupt jumps in the force were clearly observed experimentally, corresponding to the failure of subbundles. Accord…
The formation mechanism of spheroidal graphite (S.G.) in high purity Ni–C and Ni–C–Mg alloys cooled ultra-rapidly from the liquid state at four different rates (Exp. 1–Exp. 4) was investigated. The cooling rate increased from 2×104 to 5×105 (K/s) in the order of the experimental number. Contrary to the previous result…
Within the action COST 539 - ELENA our contribution was aimed at studying solution based approaches for the morphology control of BaTiO3 particulates. Initially, our kinetic analysis and systematic structural and morphological studies, demonstrated that during hydrothermal synthesis from layered titanate nanotubes (Ti…
Micro and nano fabricated bio-systems and bio-devices can be produced once compatible processes for the integration of biomaterials and micro and nano systems are developed. Here, we demonstrate the integration of Alzheimer’s β-amyloid peptide nanofibers with metalized electrodes. The metalized electrodes and Alzheime…
ZnO thin films were deposited on polyethersurfone (PES) substrates by atomic layer deposition (ALD). We investigated the effects of O2plasma pretreatment from 0 W to 100 W before the ZnO growth. When the plasma power was increased, the PET substrate surface roughness was also increased. However, the surface roughness…
In the present study, thermal behaviour and microstructure of the TeO2–WO3 system have been investigated. Different compositions of (1� x)TeO2 – xWO3 system (x = 0.02, 0.05, 0.15, 0.25 and 0.40 in molar ratio) were prepared. The samples waited at 750°C in a platinum crucible for 30 min and then quenched in a water bat…
この論文は酸化チタン触媒活性中心の分子モデルを提唱し，このモデルが酸化チタン触媒作用の本質を表しているかについて，水分解反応のシミュレーションによって示す．分子モデルのHOMOが活性中心のチタン原子と酸素原子から構成されていることが示された．次に水分子を分子モデルに吸着させた後，水を強制的に解離し反応のエネルギー極小経路を探索した．水分子は活性中心のチタン原子直上に吸着し，吸着した水分子の水素原子は最終的に隣接する活性中心チタン原子上に移動するが，直接移動するのではなく隣接する酸素原子上を経由して移動することがわかった．隣接チタン原子上に移動した水素原子は水分子におけるイオン結合的状態からラジカル結合的状態に変化し，水素原子の還元…
We apply a novel method of a spectral interferometry combined with NSOM in the spatiotemporal characterization of femtosecond localized plasmon at metal nanostructures to control over localized plasmon spatiotemporally.
A rigorous coupled-wave model describing the diffraction characteristics of transverse-magnetic (TM) waves by a concentric-circular metal grating (CCMG) operating within terahertz regime is presented. The high-order diffracted cylindrical waves are taken into account by expanding the TM field as infinite spatially har…
The development of X100, 13mm thick, on coil at ArcelorMittal is on schedule. Different steel compositions grouped in different categories A, C, D with various alloying contents and carbon equivalents have been tested by means of appropriate laboratory simulations. From these simulations, two different concepts have b…
Particular geometries and loading conditions may have important effects on the stress fields of a given component promoting complex triaxial stress states and modifying the hydrostatic stress level. The yield condition of a ductile material is represented by the von Mises stress. However, the triaxial stress states ha…
Les rejets des usines de pâtes à papier ont une composition assez diverse et présentent une grande menace environnementale. L’épuration des eaux résiduaires alcalines de fabriques de pâte et papier pose, actuellement, un problème très ardu à résoudre. Un des aspects les plus intéressants de ce procédé, outre son prix…
The effect of in‐situ N‐ion irradiation on the recombination dynamics of GaInNAs/GaAs semiconductor saturable absorber mirrors has been studied. The samples were fabricated by molecular beam epitaxy using a radio frequency plasma source for nitrogen incorporation in the absorber layers as well as for the irradiation.…
中性子回折を用いて代表的マルチフェロイック物質RMnO3とRMn2O5の磁気構造の研究が行われてきた。単結晶を用いた磁気構造解析により両物質が強誘電相でサイクロイド型磁気構造を持つことが明らかにされた。更に電場下での偏極中性子回折によりサイクロイドの回転方向と自発電気分極の方向が一対一対応していることも見出された。これによりサイクロイド型磁気秩序が直接的に自発電気分極を創出していることが実験的に証明された。
The anchoring and orientation of liquid crystal (LC) molecules are influenced by several parameters. This paper presents theoretical work that aims to explain how surface changes and potential due to corrosion, affect the LC orientation and anchoring. This work is done with a view of enabling the design and developmen…
It is shown that the optical properties of metallic nano-apertures on dielectric substrates exhibit dramatically different behaviors than apertures immersed in dielectrics and scale with refractive index more complicatedly than predicted by analytical models.
A new type of lithography that uses an electron beam to spark a chemical reaction could provide a way to build incredibly tiny transistors, which the chipmaking industry will require in a few years. Researchers from Taiwan and the University of California, Berkeley, say they've made static RAM that anticipates 16-nano…
We present an analytic form for the field dependence of terms in the FRINGE Zernike polynomial expansion for optical systems that are not rotationally symmetric, but, contain optical surfaces are that are rotationally symmetric.
An electrodynamical approach is suggested for the problem of arbitrarily incident wave diffraction by a system of periodic strips near a screened anisotropic (plasma-like) medium. The medium possesses full anisotropy. The six components of the system reflection field have been analytically obtained.
A simple route of external mechanical force is presented for enhancing the electrical properties of polymer nanocomposite consisted of nanowires. By dispersing ZnO nanowires in polymer solution and drop casting on substrates, nanocomposite transistors containing ZnO nanowires are successfully fabricated. Even though t…