Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Calmodulin (CaM) is a primary Ca 2+ -binding protein found in all eukaryotic cells. It couples the intracellular Ca 2+ signal to many essential cellular events by binding and regulating the activities of more than 40 different proteins and enzymes in a Ca 2+ -dependent manner. CaM contains two structurally similar dom…
Densification and anisotropic grain growth in diphasic‐gel‐derived, titania‐doped mullite were studied. Titania enhanced initial and intermediate stage densification in diphasic mullite gels by reducing the glass viscosity. Rodlike anisotropic mullite grains started to grow in titania‐doped diphasic mullite gels once…
The causes of the decrease in electrical conductivity with aging in Y 2 O 3 ‐stabilized zirconia, an oxygen‐ion conductor, were studied. This study was carried out using the dc four‐probe technique for measuring electrical conductivity and the activation energy for the migration of oxygen ions. The results show that c…
The influence of unpolarized and linearly polarized UV exposure on previously rubbed as well untreated thin polyimide (PI) alignment layers was studied. Optical retardation and surface morphology measurements were carried out to understand the nature of surface modification as a function of the polarization and the ex…
The identification process of the classical Preisach-type hysteresis model reduces to the determination of the weight function of elementary hysteresis operators upon which the model is built. It is well known that the classical Preisach model can exactly represent hysteretic nonlinearities which exhibit wiping-out an…
Of 140 newly synthesized chalcone-analogous materials, 56 specimens were observed to be efficient for nonlinear optical second harmonic generation (SHG). The SHG efficiency of 3-(4-chlorophenyl)-1-(3-pyridyl)-2-propen-1-one is discussed on the basis of crystal structure and MO calculation. In this crystal, molecules a…
Various synthetic protocols were used to prepare several classes of polysiloxane–silica filler systems. The structures of these fillers and their interactions with the polysiloxane matrices were studied using small-angle X-ray and neutron scattering. In addition, the mechanical properties of the composites were charac…
A general neural approach to magnetic hysteresis modeling is proposed. The general memory storage properties of systems with rate independent hysteresis are outlined. Thus, it is shown how it is possible to build a neural hysteresis model based on feed-forward neural networks (NN's) which fulfills these properties. Th…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPicosecond Molecular Switch Based on Bidirectional Inhibition of Photoinduced Electron Transfer Using Photogenerated Electric FieldsDavid Gosztola, Mark P. Niemczyk, and Michael R. WasielewskiView Author Information Chemistry Division, Argonne National Laboratory Argon…
The formation of an anisotropic gel—a member of a new class of gel—is described. A structure is proposed for the liquid-crystalline gel (see also the cover of this issue), which was formed by the gelation of a room-temperature nematic liquid crystal, achieved by the self-aggregation of low-molecular-weight molecules t…
The antiferroelectric to ferroelectric phase transition in NaNbO3 was investigated by Raman scattering between 295 and 10 K. The transition occurs at 185 K on cooling and the antiferroelectric and ferroelectric phases coexist at low temperature. The transition occurs at 210 K on heating and the relatively large hyster…
Abstract The interface between plastic and wood fibers strongly influences the mechanical properties of a plastic/wood‐fiber composite. This paper presents a means for evaluating the effectiveness of surface treatment on the wood‐fibers in the PVC/wood‐fiber composites by investigating the adhesion between PVC and lam…
Guided-mode resonant grating filters have numerous applications. However, in weakly modulated gratings designed for use at normal incidence, the filtering resonance of these subwavelength-period devices splits for angles of incidence that are even slightly off normal incidence. Strongly modulated gratings are designed…
New strategies are reported for assembling Au nanoparticles into coupled 1D arrays. The mehods employ porous filtration membranes as templates to entrap and align particles along the long axis of the pores. Following alignment, nanoparticles were linked by 1,6-hexanedithiol to make shorter linear nanoparticle arrays (…
Extension of the surface sol-gel process to form molecularly alternate metal oxide/polymer films is reported. The Figure is a schematic illustration of the chemical structure of TiO2/poly(acrylic acid) multilayers grown using this method. It is demonstrated that films can also be assembled using aluminum, zirconium, n…
Carbon formed from CO in CO 2 at around 500 °C deposited as nanotubes and encapsulating carbons on a supported Ni catalyst without H 2 or as filaments if H 2 was present. A thermodynamic model explains how hydrogen in low concentrations controls filament morphology and why equilibrium is shifted from that for graphite…
The syntheses, crystal structures, and physical properties of the series of radical salts made with bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF or ET) and monosubstituted α-Keggin polyoxoanions of formula [XZ(H 2 O)M 11 O 39 ] 5 - (XZM 11 = Si IV Fe III Mo 11, Si IV Cr III W 11, P V Co II W 11, P V Ni II W 11, P V…
The origin of the long-term gelation of clay suspensions was recently questioned. We have investigated this problem by looking at the chemical stability of the laponite solid particles as a function of the preparation, the long-term storage, and the age of the suspensions. Under ambient atmosphere, ${\mathrm{Mg}}^{2+}…
Excited-state energy migration among a collection of pigments forms the basis for natural light-harvesting processes and synthetic molecular photonic devices. The rational design of efficient energy-transfer devices requires the ability to analyze the expected performance characteristics of target molecular architectu…
The Hall resistivity ${\ensuremath{\rho}}_{H}$ and magnetoresistance of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ ${(T}_{c}=265$ K) have been measured at temperatures to 360 K in fields $H$ to 14 T. By comparing ${\ensuremath{\rho}}_{H}$ with the magnetization $M$, we have extracted the ano…