Materials Literature
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Diffraction data from two non-isomorphous crystals (forms 1 and 2) of an artificial protein with a four-helix bundle motif, di-Co(II)-DF1-L13A, have been collected using synchrotron radiation. The phase of form 1 has been assigned using the group and minimal non-isomorphic supergroup relation between the space group o…
The very low temperature properties of two pyrochlore compounds, Yb2Ti2O7 and Gd2Sn2O7, were investigated using an ensemble of microscopic and bulk techniques. In both compounds, a first order transition is evidenced, as well as spin dynamics persisting down to the 20mK range. The transition however has a quite differ…
We derive an effective Hamiltonian for ${\rm Ga}_{1-x}{\rm Mn}_x {\rm As}$ in the dilute limit, where ${\rm Ga}_{1-x}{\rm Mn}_x {\rm As}$ can be described in terms of spin $F=3/2$ polarons hopping between the {\rm Mn} sites and coupled to the local {\rm Mn} spins. We determine the parameters of our model from microsco…
We perform a first principles calculation of the anomalous Hall effect in ferromagnetic bcc Fe. Our theory identifies an intrinsic contribution to the anomalous Hall conductivity and relates it to the k-space Berry phase of occupied Bloch states. The theory is able to account for both dc and magneto-optical Hall condu…
A unified approach for description of the anomalous critical current enhancement in dislocated, deoxygenated, and particle irradiated superconductors is proposed based on a novel concept of "active pinning" (pinning via external fields modified intrinsic Josephson junctions) and existence of various competitive forces…
Lennard-Jones glasses (made on a computer by quenching from liquid state coordinates) are studied in harmonic approximation. Vibrational eigenfrequencies and eigenvectors are found by exact diagonalization for models with periodic boundaries and N=(500, 2048, and 6980) atoms. We analyze the density of states, mobility…
The electronic structures of the localized $5f$ systems UTSn (T=Ni, Pd) have been investigated using photoemission spectroscopy (PES). The extracted U $5f$ PES spectra of UTSn (T=Ni, Pd) exhibit a broad peak centered at $\sim 0.3$ eV below $\rm E_F$ with rather small spectral weight near $\rm E_F$ (N$_f$($\rm E_F$)).…
The nano dimensions, graphitic surface chemistry and electronic properties of single walled carbon nanotubes make such a material an ideal candidate for chemical or biochemical sensing. Carbon nanotubes can be nondestructively oxidized along their sidewalls or ends and subsequently covalently functionalized with collo…
We have developed the large ampullate glands of the orb-web spider Nephila clavipes as a model system in which to study the production of a tissue-specific secretory protein. Through simple manipulations, the glands' fibroin production can be practically abolished and subsequently elicited into high levels of synthesi…
I Puente-Lee, P S Schabes-Retchkiman, J Rojas-García, L Ríos-Guerrero, R Herrera-Nájera; Morphology Of SBS–Modified Asphalt Using Low Vacuum SEM, Microscop
最近, 様々な優れた特性を持つ鋼材が開発されている. しかし, それらの鋼材は, 必ずしも橋梁の性能と適合したものになっているわけではない. 橋梁の性能に適合した鋼材を選定することができれば, 橋梁の性能向上のほか, 橋梁の建設コストを縮減することも可能になる.本論文では, 日本における高強度鋼材の開発と使用の歴史をレヴューしたうえで, 橋梁用鋼材として求められる性能をまとめ, その性能を満足する鋼材を橋梁用高性能鋼材BHS500, BHS500WおよびBHS700として提案する. BHS500およびBHS500Wについては, 各種特性試験を行って要求性能を満足することを確認するとともに, これらの鋼材を用いるとどの程度のコスト縮…
Abstract A reverse micelle-assisted route was reported to prepare ZnO nanorods from two different precursors, Zn(NH3)42+ and Zn(OH)42−, respectively. The reverse micelles were used as microreactors, which lead into anisotropic growth of ZnO crystals during a simple solvothermal process.
Abstract Metal complexes of a highly deformed 1,4,8,11,15,18,22,25-octaphenylphthalocyanine have been synthesized, and found to show various colors ranging from bright green, ocher, and red depending on the central metal employed.
Abstract The influence of the surface chemistry of the cellulose fiber and polymer matrix on the mechanical and thermal dynamic mechanical properties of cellulose‐fiber‐reinforced polymer composites was investigated. The cellulose fiber was treated either with a coupling agent or with a coupling‐agent treatment follow…
Abstract Thermotropic liquid‐crystalline (LC) semirigid polyesters based on three terphenyl analogues of 1,3,4‐thiadiazole (2,5‐diphenyl‐1,3,4‐thiadiazole)s (DPTD) linking undecamethyleneoxy chain at different substituted positions were synthesized from three disubstituted (4,4′‐, 3,4′‐, and 3,3′‐) dioxydiundecanols o…
Abstract In a differential absorption experiment the induced infrared transitions from the excitonic 1s to the 2p levels in Cu 2 O have been investigated. Intermediate densities of 1s excitons were created by cw‐laser excitation while the interexcitonic 1s to 2p transitions were probed simultaneously, using Fourier sp…
Abstract The synthesis and characterisation (X‐ray structure and magnetism) of metal complexes (Ni, Au) with the [Mn(Cp*) 2 ] + cation and the dmit 2− and dmid 2− ligands are reported. [Mn(Cp*) 2 ][Ni(dmit) 2 ] ( 1 ) and [Mn(Cp*) 2 ][Au(dmit) 2 ] ( 2 ) exhibit the same structural arrangement, built on stacks of [Ni(dm…
At high temperatures both the resistivity $(\ensuremath{\rho})$ and thermopower of ${\mathrm{La}}_{1\ensuremath{-}x}{M}_{x}{\mathrm{MnO}}_{3}$ $(M=\mathrm{Ba},$ Sr, Ca) single crystals can be described well by a small-polaron hopping model. The polaron binding energy decreases while the orbital ordering transition ${(…
Abstract Poly(diethylsiloxane) and its copolymers with various kinds of R 1 R 2 SiO (R 1 = R 2 = methyl or phenyl, or R 1 = methyl and R 2 = phenyl) units have been prepared by the equilibrium polymerization of cyclosiloxanes. All the polymers have been characterized by 1 H and 29 Si NMR, gel permeation chromatography…
Abstract A 2 NiMoO 6 (A = Sr, Ba) perovskites have been prepared in polycrystalline form by thermal treatment, in air, of previously decomposed citrate precursors. These materials have been studied by X‐ray (XRD) and neutron powder diffraction (NPD) data. At room temperature, the crystal structure is tetragonal, space…