Materials Literature
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Escherichia coli pyridoxine 5'-phosphate oxidase (ePNPOx) catalyzes the terminal step in the biosynthesis of pyridoxal 5'-phosphate (PLP) by the FMN oxidation of pyridoxine 5'-phosphate (PNP) or pyridoxamine 5'-phosphate (PMP), forming FMNH(2) and H(2)O(2). The crystal structure of ePNPOx is reported in a tetragonal u…
Diblock copolymers with different poly(<TEX>$\varepsilon$</TEX>-caprolactone) (PCL) block lengths were synthesized by ringopening polymerization of <TEX>$\varepsilon$</TEX>-caprolactone in the presence of monomethoxy poly(ethylene glycol) (mPEG-OH, MW 2000) as initiator. The self-aggregation behaviors of the diblock c…
The elastic and piezoelectric constants of tungsten bronze ferroelectric crystals (Sr0.7Ba0.3)2NaNb5O15 (SBNN70) and (Sr0.3Ba0.7)2NaNb5O15 (SBNN30) are determined by using the ultrasonic and resonance methods. The measured results show that these single crystals have larger dielectric constant and good piezoelectric p…
The determination of protein structures on a genomic scale requires both computing capacity and efficiency increases at many stages along the complex process. By combining bioinformatics workflow-management techniques, cluster-based computing and popular crystallographic structure-determination software packages, an e…
요 약.CRT나 EL용 발광소자로 이용되는 Thiogallate 형광체는 장파장 영역에서 높은 광발광(Photoluminescence) 특성을 지니고 있는 것으로 보고되었다.이들 형광체 중에서 Ei产가 도핑된 CaGa2S4 형광체를 독성의 H?S나 CS, 기체를 사용하지 않고 5% Hj/95%N2의 혼합기체를 이용해 단순한 공정으로 제조하였다.이렇게 제조된 형광체는 기존의 YAG:Ce3+ 형광체와 비교하여 발광효율이
We study the mutual interactions of simple parallel polymers within the framework of density-functional theory (DFT). As the conventional implementations of DFT do not treat the long-range dispersion [van der Waals (vdW)] interactions, we develop a systematic correction scheme for the nonlocal energy contribution of t…
Abstract A series of hybrid polyimide–silica hybrids films were prepared by a sol–gel process via the blending of tetrathoxysilane and a coupling reagent in a pyromellitic anhydride/4,4′‐oxydianiline (ODA) based poly(amic acid) solution in N , N ‐dimethylacetamide, the casting of the films, the evaporation of the solv…
Kinetics, Transport, and Structure in Hard and Soft Materials is the only single reference that discusses the connection between structure and mechanisms of atomic or molecular transport in different classes of materials, from metals and semiconductors to network glasses, polymers and supercooled liquids. Divided into…
The influence of oxygen and polymer concentration on the quenching of the photoluminescence (PL) from a water-soluble conjugated macromolecule, sodium poly[2-(3-thienyl)ethyloxy-4-butylsulfonate)] (PTE-BS), was investigated. The presence of oxygen in the polymer solution decreases the photoluminescence by 6.4%. The sh…
Equilibrium adsorption isotherms for low-volatile compounds are extremely difficult to measure. A simple technique using temperature programmed desorption (TPD) is proposed. It is demonstrated that the two parameters needed for constructing the Langmuir isotherm can be derived with data from the TPD technique alone. T…
We report on the spectroscopic investigation of ${\mathrm{Pr}}^{3+}$-doped binary, ternary, and quaternary fluoride compounds exhibiting photon cascade emission. Under vacuum-ultraviolet synchrotron excitation at wavelengths below 200 nm in the $4f5d$ bands of the ${\mathrm{Pr}}^{3+}$ ion the emission spectra show int…
Some operating buried transmission pipeline systems will develop unforeseen surface corrosion. Electrochemical corrosion behavior of low carbon line pipe steel in NS4 soil test solution has been investigated by EIS method. Corrosion phenomenon is accentuated by influence of such soils parameters as specific resistance…
Abstract A thin, highly crosslinked layer was grafted onto an alkyl thiol self‐assembled‐monolayer (SAM)‐coated gold surface with N,N ′‐methylene bisacrylamide (MBAA), a widely used crosslinker with two polymerizable groups, as the monomer. Surface‐initiated photografting copolymerization was achieved through the immo…
Nanometer-sized coaxial cables with a single-crystal ZnS core and a thin amorphous SiO2 shell were synthesized by simple thermal evaporation in vacuum. As-fabricated ZnS/SiO2 nanocables were studied using scanning electron microscopy, x-ray diffraction and transmission electron microscopy. The ZnS/SiO2 nanocables have…
Abstract Tri(acryloyloxyethyl)phosphate (TAEP) and di(acryloyloxyethyl)ethyl phosphate (DAEEP) were used as reactive‐type flame‐retardant monomers along with commercial epoxy acrylate and polyurethane acrylate oligomers in ultraviolet (UV)‐curable resins. The concentrations of the monomers were varied from 17 to 50 wt…
Abstract Organophilic montmorillonite (MMT) was prepared by ion exchange between Na + ions in the clay and twin benzyldimethyloctadecylammonium bromine cations in an aqueous medium. The organophilic MMT particles were easily dispersed and swollen in styrene monomer. Polystyrene–MMT nanocomposites were prepared by the…
We have investigated the absorption of cyclohexane vapor into polystyrene films and the resulting polymer interdiffusion that is enabled by this process. The swelling of films due to solvent absorption was relatively insensitive to the film thickness or polymer molecular weight but increased with increasing temperatur…
Magnetic nanobelts of iron-doped zinc oxide were fabricated by vapor–phase transport using zinc oxide, iron oxide, and graphite as source materials. The nanobelts grew mainly along [101¯0] orientation and enclosed by ±(0001) and ±(1¯21¯0) surfaces. The measurements of x-ray diffraction, energy-dispersive x-ray spectro…
We describe a nonpolarizing filter design at oblique incidence and a polarizing filter design at normal incidence that use a uniaxially anisotropic layer. The phase thicknesses and the optical admittances of the layers are compensated for by the birefringent properties of a thin film at oblique incidence. This concept…
In this paper we report the experimental observations of the effects of various surfactants on the oscillations of the ferroin-catalyzed Belousov-Zhabotinsky (BZ) reaction. The oscillations are followed by observing the change in absorbance at 510 nm due to ferroin in a well-stirred closed BZ reacting system. We have…