Materials Literature
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Ecoregional differences in geology and hydrology may affect physical and chemical conditions in streams and, consequently, the species composition of algal assemblages. Stresses resulting from human disturbance, however, may constrain species membership in algal assemblages and reduce regional diversity. We expected t…
A new strategy for the simultaneous modeling of molecular weight distribution (MWD) and degree of branching distribution (DBD) for such branched polymers as bimodal low-density polyethylene is presented, based on the Galerkin h−p finite element package P redici, a commercial code. The key problem of how to address a b…
The nucleation of calcium phosphate crystals from a weakly supersaturated calcium phosphate solution on the surface of polyelectrolyte multilayers was investigated in dependence on the chemical nature of the outermost layer. Scanning angle reflectometry was used to follow in situ the initial stages of the nucleation k…
A series of azobenzene-containing side chain liquid crystalline polymers with various spacer lengths ( p X MAN, where X, the number of methylene units, varies from 4 to 12) have been synthesized and characterized. Phases and aggregation have been studied by UV−visible spectroscopy as a function of temperature. Polariz…
Male 5-week old ICR mice were examined for the effect of feeding silk protein, sericin on colon carcinogenesis. In experiment 1, mice were fed the diets supplemented with 1.5% or 3% sericin for five weeks, and given weekly injections of 1,2-dimethylhydrazine (DMH) for the initial three weeks. Supplemental sericin caus…
Static and molecular dynamics simulations have been used with different types of interatomic potentials to investigate the structure, properties and stability of self-interstitial atom (SIA) clusters produced during irradiation. In α-iron (Fe), faulted clusters of <110> dumbbells are unstable for all the potentials. T…
Proline residues are known to perturb the structure of helices by introducing a kink between the segments preceding and following the proline residue. The distortion of the helical structure results from the avoided steric clash between the ring of the proline at position (i) and the backbone carbonyl at position (i -…
X-ray radiation damage of a lysozyme single crystal by an intense monochromatic beam from a third-generation radiation source at the Advanced Photon Source has been studied. The results show that primary radiation damage is linearly dependent on the X-ray dose even when the crystal is at cryogenic temperatures. The ex…
Diamond is an exceptionally radiation-hard material, but the main mechanisms by which lattice damage results from irradiation of high-energy particles and photons are not well understood. Models of radiation damage in diamond have been built up for both electron and gamma irradiation using Monte Carlo computer simulat…
The electronic structure of carbon nitride $({\mathrm{CN}}_{x})$ film produced by low-energy ion implantation has been studied by N 1s near-edge x-ray-absorption fine structure (NEXAFS). The NEXAFS spectra of ${\mathrm{CN}}_{x}$ film have shown three sharp ${\mathrm{\ensuremath{\pi}}}^{\mathrm{*}}$ and one broad ${\ma…
The effects of Mo and Pd segregation on the cohesion of the Fe $\ensuremath{\Sigma}3(111)$ grain boundary are investigated by using the first-principles full-potential linearized augmented-plane-wave total-energy--atomic-force method with the generalized gradient approximation. Based on the Rice-Wang model, our total…
An ultrafast response of a silver nanoparticle system, as fast as 360 fs, was observed in a femtosecond optical-Kerr-shutter experiment. The ultrafast response is attributed to a self-diffraction of a pump pulse due to transient grating. We estimated χ (3) of the silver nanoparticle system to be 1.5 × 10 -7 esu in the…
There is increasing evidence that entropy can induce microphase separation in binary fluid mixtures interacting through hard particle potentials. One such phase consists of alternating two-dimensional liquidlike layers of rods and spheres. We study the transition from a uniform miscible state to this ordered state usi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTManganese Oxide Thin Films with Fast Ion-Exchange PropertiesOscar Giraldo, Stephanie L. Brock, William S. Willis, Manuel Marquez, Steven L. Suib, and Stanton ChingView Author Information Department of Chemistry, University of Connecticut, U-60 55 North Eagleville Rd.,…
Rietveld quantitative X-ray diffraction analysis of the fly ash Standard Reference Materials (SRMs) issued by the National Institute of Standards and Technologies was performed. A rutile ( TiO 2 ) internal standard was used to enable quantitation of the glass content, which ranged from 65% to 78% by weight. The GSAS R…
An effective way to design well-fitting products is to analyse human body forms and to classify them into several groups. In the present study, a new method is proposed to analyse human body forms using the FFD (Free Form Deformation) technique. The FFD method is a way to deform the shapes of object smoothly by moving…
We have found giant negative magnetoresistance in the one-dimensional conductor $\mathrm{TPP}[\mathrm{Fe}(\mathrm{Pc})(\mathrm{CN}{)}_{2}{]}_{2}$ below 50 K. The reduction of the resistance is larger in the field perpendicular to the one-dimensional axis than parallel to the axis. The magnetic susceptibility shows ani…
Synthetic polymers and co-polymers are described, to be used as carriers of reporter groups for gamma-, magnetic resonance (MR), and computed tomography (CT) imaging. Those compounds include polychelating and amphiphilic polymers and serve as key components of various contrast agents. Single terminus-activated polyche…
Attaching branched alkyl chains directly to the phenyl ring of substituent R in hexaalkynylbenzene (see picture) proved to be the key in the synthesis of the first room-temperature discotic nematic liquid crystals. A liquid crystal device having discotic nematic liquid crystals shows advantages over conventional devic…
The site preference and magnetic properties of Zn-Zr substituted BaM ferrite ${\mathrm{BaFe}}_{12\ensuremath{-}x}{\mathrm{Zn}}_{x/2}{\mathrm{Zr}}_{x/2}{\mathrm{O}}_{19}$ nanoparticles with $x=0--1.6$ have been studied using M\"ossbauer spectra and magnetic measurement. The results show that the magnetizations and magn…