Materials Literature
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Immobilization of lactate dehydrogenase (LDH) has been carried out on electrochemically prepared polyaniline (PANI) films. The results of the photometric and amperometric response measurements conducted on such LDH/PANI electrodes show the response time as 90 s and shelf-life as about two weeks at 4–10 °C indicating t…
Bridging stresses that result both from elastic tractions and frictional interlocking in the wake of an advancing crack have been evaluated quantitatively via in situ Raman microprobe spectroscopy in a toughened Si 3 N 4 polycrystal. Crack opening displacement (COD) profiles of bridged cracks also have been measured q…
Polypeptide surfaces are regarded as key compounds; e.g. for the control of biomimetic steps in biomineralization processes. Here is described the application of microcontact printing in the patterning of gold surfaces with monolayers of an initiator, which was used to polymerize a thin layer of polypeptide. The Figur…
This study examines how the relative role of coalescence suppression and interfacial tension reduction influence the particle size at various levels of in situ compatibilization. The polymers studied are polyethylene terephthalate (PET) as matrix and a polypropylene (PP) as dispersed phase compatibilized by a triblock…
The electron-energy-loss near-edge structures (ELNES) of the B $K,$ C $K,$ and N $K$ ionization edges of different phases in the boron-carbon-nitrogen (B-C-N) system are calculated using a multiple scattering (MS) approach. A comparison of calculated and experimental spectra for cubic diamond, graphite, cubic $(c$-BN)…
A new photoswitchable peptide system composed of two flat, ring-shaped cyclic octapeptides with the sequence cyclo -[( l -Phe- d - Me N -Ala) 3 - l -Cys- d - Me N -Ala] tethered via an azobenzene moiety was investigated at the air−water interface, on mica, germanium, and quartz glass supports. Surprisingly, both the E…
PURPOSE: To estimate the toxicity and response rate of high-dose liposome-encapsulated doxorubicin (TLC D-99, Evacet, The Liposome Company Inc, Princeton, NJ) in patients with advanced breast cancer. PATIENTS AND METHODS: Fifty-two breast cancer patients with bidimensionally measurable metastatic disease and no prior…
The angular and velocity distributions of desorbing N2, N2O, and NO molecules were studied in the decomposition of NO and also N2O on a palladium (110) surface by means of angle-resolved thermal desorption combined with cross-correlation time-of-flight techniques. The results were quite similar in both cases although…
A long-standing goal of biomedical device development has been the generation of specific, desired host blood and tissue responses. An approach to meeting this design criteria is precise surface modification that creates micropatterns of distinct physicochemical character to direct cell adhesion and behavior. For this…
We have used a first-principles, density-functional-based method to calculate the electric polarizabilities and dipole moments for several low-energy geometries of Si clusters in the size range $10<~N<~20$. The polarizability per atom is found to be a slowly varying, nonmonotonic function of N. Over this size ra…
The rigid-rod model is capable of predicting several rheological features of rodlike polymers in the nematic phase. The model is formulated in terms of a nonlinear partial differential equation that describes the evolution of an orientational distribution function. The morphological properties and the rheological resp…
The endothermal steam reforming reaction of methane within the anode chamber of solid oxide fuel cell (SOFC) stack (internal reforming) is favorably applied to reduce cost and improve the thermal balance within the stack, This reaction, catalysed by the Ni/YSZ anode material (substrate), is very fast and influences th…
Atomic XAFS (AXAFS) offers die potential for a new tool to gain relatively detailed electronic structure and polarization information on systems, in-sit'u, that may not contain long range geometric order. We have shown previously that AXAFS can monitor ch_anges in die charge of less than 0.05e per surface Pt atom on a…
A novel tetrafunctional epoxy resin, namely N,N,N′N′-tetrakis(2,3-epoxypropyl)-4,4′-(1,4-phenylenedioxy)dianiline, has been synthesized. The curing kinetics has been studied by differential scanning calorimetry (DSC) using various amine curing agents. Thermal stabilities of the cured products have been investigated by…
A series of Ni/Al 2 O 3 –AlPO 4 catalysts has been prepared, thereby allowing the effect of nickel content and calcination temperature on the structural and catalytic activity of such solids to be investigated. The textural parameters of all the prepared samples were determined from nitrogen adsorption studies conduct…
XANES (X-ray absorption near edge structure) spectrum of an area of a few tens of square micrometers of MgO is measured with an EPMA (electron probe X-ray microanalyzer) using a novel method -EXEFS (extended X-ray emission fine structure) method -proposed by the present authors. The EXEFS method has the following six…
This paper presents the design, construction, and test results of an electromagnetic stress sensor. The sensor uses the reverse magnetostrictive effect found in high elastic limit steels such as those used in cables and in prestressed concrete. This effect is characterized by the variation in the steel's magnetic perm…
A theoretical model is developed according to which crystals formed in a glass-forming melt can exhibit a previously unreported growth behavior. After growing very fast in one or two directions, the growth stops due to changes in concentration and turns into dissolution. Along the other direction(s) the growth rate is…
This paper deals with the numerical analysis of electromechanical devices. The dynamic characteristics are described by Maxwell's equations, by the constitutive equations, and by the equations of motion. For the solution of the electromagnetic problem a comparison between the BEM-FEM coupling method and a pure FEM app…
The application of an evolution strategy for the optimal design of high voltage bushing electrodes in transformers is investigated. The convergence of calculation and the evolution principles are specially developed and some measures to accelerate the speed of the strategy are pointed out. The electrode of the bushing…