Materials Literature
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Abstract The anionic ring‐opening polymerization of L‐lactide was initiated by dipotassium‐poly‐isobutylene‐alcoholate telechelic polymer to yield poly( L ‐lactide)‐ block ‐polyisobutylene‐ block ‐poly( L ‐lactide) triblock copolymer, a partially biodegradable thermoplastic elastomer. The pure triblock copolymer was o…
The intrinsic 1.9-eV photoluminescence band (the R band) in neutron-irradiated synthetic silica glass has been studied using site-selective photoluminescence excitation in the 2.0 eV absorption band and transient spectral hole-burning techniques. The measurements of the low-energy wing of the zero-phonon line intensit…
The effects of atomic-scale voids on the strength and mechanical behavior of aluminum at zero temperature are investigated using the total-energy pseudopotential method. A series of calculations are performed in which the defective system is extended by a small increment and then is relaxed to its ground state configu…
Structure factors for synthetic yttrium orthoferrite, YFeO 3 , measured with MoKα (λ = 0.71073 A) X-radiation and using a smaller crystal with focused λ = 0.75 A synchrotron radiation are broadly consistent. Approximate symmetry in concordant difference densities indicates that cations deform the electron density more…
This study was conducted to determine water sorption isotherms of cellulose‐based films made from methyl cellulose (MC) and hydroxypropyl cellulose (HPC), and to evaluate the effect of plasticizer concentration and temperature on water vapor permeability coefficient in those films. the equilibrium moisture contents of…
A new technique for producing hollow shell laser fusion fuel capsules has been developed that starts with a depolymerizable mandrel. In this technique we use poly(α-methylstyrene) (PAMS) beads or shells as mandrels which are overcoated with plasma polymer. The PAMS mandrel is thermally depolymerized to gas phase monom…
Amorphous carbon films grown by low-energy mass-selected ion-beam deposition have been characterized by inelastic and elastic electron scattering. Films were grown using deposition energies from 10 up to 2000 eV. Most samples were deposited at room temperature with a few deposited at elevated substrate temperatures. T…
An increasingly urgent topic for the realization of densely packed (mixed signal) integrated circuits is prevention of cross-talk via the substrate. This paper proposes a Boundary Element Method (BEM) for calculating an admittance matrix for the substrate in order to analyze the parasitic coupling during layout verifi…
Dendritic chromatophores that contained blue pigmentary organelles were found in the bluish parts of the skin of two callionymid species, the mandarin fish, Synchiropus splendidus, and the psychedelic fish, S. picturatus. We named these novel cells “cyanophores” and the organelles “cyanosomes”. In response to various…
We present results from a Monte Carlo study of polymer adsorption from solution at a solid-liquid interface, in the limit of infinitely large adsorption energy. We study the kinetics of adsorbed layer formation for both the cases of end-functionalized chains and homopolymers. In the former case, the adsorbed layer is…
The temperature dependence of 〈111〉 tilt grain boundaries with angles of misorientation of 38·2° and 40·5° was investigated in bicrystals of both pure (99·999%) Al and the same Al doped with 10ppmGa in the temperature regime between 400 and 580°C. The grain boundary mobility for the investigated grain boundaries over…
Shape memory alloys (SMA) are a class of materials proposed to be used as actuator elements in smart structures. They undergo a reversible martensitic phase transformation during thermal cycling. In this work, 55-nitinol (55% nickel-45% titanium shape memory alloy) was investigated to determine the effect of training…
Toxic and/or carcinogenic consequences may result from metal ion substitution for the Zn-(II) in transcription factors containing zinc fingers, and the small Cys-rich metal-binding protein metallothionein (MT) may play a role in this metal substitution. To begin to evaluate this hypothesis, with regard to the carcinog…
SUMMARY The L 3 to L 2 white‐line intensity ratios of Mn in solid solution in yttria‐stabilized zirconia and in Mn oxide standards are measured using different approaches. We show that the L 3 /L 2 ratio alone cannot be used as a means of deducing the oxidation state and that a combined analysis of this ratio and the…
The UvrABC endonuclease from Escherichia coli repairs damage in the DNA by dual incision of the damaged strand on both sides of the lesion. The incisions are in an ordered fashion, first on the 3'-side and next on the 5'-side of the damage, and they are the result of binding of UvrC to the UvrB-DNA preincision complex…
Abstract Creep and differential scanning calorimetry (DSC) measurements have been used to study the physical aging behavior of a polyetherimide. Isothermal aging temperatures ranged from 160°C to T g with aging times ranging from 10 min to 8 days. The only measurable effect of physical aging on the short‐time creep cu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-Assembled Monolayer Coatings on Nanosized Magnetic Particles Using 16-Mercaptohexadecanoic AcidQingxia Liu and Zhenghe XuCite this: Langmuir 1995, 11, 12, 4617–4622Publication Date (Print):December 1, 1995Publication History Published online1 May 2002Published inissue 1…
A combined theoretical/experimental study of the heat transfer in thermoelectric shape memory alloy (SMA) actuators is undertaken in this paper. A one-dimensional model of a thermoelectric unit cell with a SMA junction is developed first and the transient temperatures in the SMA are evaluated for different applied ele…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConductivity In Redox Modified Conducting Polymers. 2. Enhanced Redox Conductivity in Ferrocene-Substituted Polypyrroles and PolythiophenesGianni Zotti, Sandro Zecchin, Gilberto Schiavon, Anna Berlin, Giorgio Pagani, and Augusto CanavesiCite this: Chem. Mater. 1995, 7, 12, 2…
Abstract Chromium (III) 2p photoelectron spectra show strong satellites on the high‐binding‐energy side of the main photoelectron peaks. In the case of Cr 2p spectra, the satellite of the Cr 2p 3/2 peak strongly overlaps the Cr 2p 1/2 peak. As a result, a virtual three‐peak spectrum is obtained. In order to analyse th…