Materials Literature
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PURPOSE: To prospectively compare 0.1 mmol/kg doses of gadobenate dimeglumine and gadopentetate dimeglumine for contrast-enhanced MRI of brain lesions at 3 Tesla (T). MATERIALS AND METHODS: Forty-six randomized patients underwent a first examination with gadobenate dimeglumine (n = 23) or gadopentetate dimeglumine (n…
In this paper we study the propagation of light through an asymmetric array of dielectric multilayers built by joining two porous silicon substructures in a Fibonacci sequence. Each Fibonacci substructure follows the well-known recursive rule but in the second substructure dielectric layers A and B are exchanged. Even…
Silk fibroin (SF) microspheres were prepared by a water-in-oil emulsion solvent evaporation method without any surfactants. The water and oil phases were SF aqueous solution and paraffin, respectively. The SF microspheres with spherical shape and smooth surface were separated into the size ranges of < 80 μ m, 80–150 μ…
Solid meso-tetrakis(4-sulfonatophenyl)porphyrin (TPPS(4))-chitosan supramolecular complexes were prepared by addition of porphyrin to an aqueous solution of chitosan at pH values. The precipitates obtained were assigned as 1 (pH 6.8) and 2 (pH 2.5) and characterized by spectroscopic, thermal, and microscopic methods.…
The mechanism of rapid and selective heating of magnetic metal oxides under the magnetic field of microwaves which continues beyond the Curie temperature ${T}_{c}$ is identified by using the Heisenberg model. Monte Carlo calculations based on the energy principle show that such heating is caused by nonresonant respons…
A series of ethylene vinyl acetate (EVA) nanocomposites using four kinds of EVA with 40, 50, 60, and 70 wt% vinyl acetate (VA) contents and three different carbon-based nanofillers-expanded graphite (EG), multi-walled carbon nanotube (MWCNT), and carbon nanofiber (CNF) have been prepared via solution blending. The inf…
We report on the high-pressure synthesis of ${\text{BiMn}}_{7}{\text{O}}_{12}$, a manganite displaying a ``quadruple-perovskite'' structure. Structural characterization of single-crystal samples shows a distorted and asymmetrical coordination around the Bi atom due to presence of the $6{\text{s}}^{2}$ lone pair, resul…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Poly(ferrocenylsilane) Polyelectrolyte Hydrogels with Redox Controlled SwellingMark A. Hempenius*, Concetta Cirmi, Jing Song, and G. Julius VancsoView Author Information Faculty of Science and Technology, MESA+ Institut…
Hydrogen-free diamond-like carbon (DLC) films (both amorphous (a-C) and tetrahedral amorphous carbon (ta-C)) suffer high friction and severe wear losses when tested in inert and/or high vacuum environments. However, they provide anomalous superlow friction and wear coefficients in the presence of hydrogen gas, water v…
A detailed understanding of charge density and its origins during the electrospinning process is desirable for developing new electrospinnable polymer-solvent systems and ensuring mathematical models of the process are accurate. In this work, two different approaches were taken to alter the charge density in order to…
The $\ensuremath{\pi}$-electronic structure of graphene in the presence of a modulated electric potential is investigated by the tight-binding model. The low-energy electronic properties are strongly affected by the modulation period and potential strength. Such a potential could modify the energy dispersions, destroy…
Information on the potential and the field profile along a surface discharge is required for quantitatively discussing and clarifying the propagation mechanism. The sensing technique with a Pockels crystal has been developed for directly measuring the potential and electric field distribution on a dielectric material.…
Beam-surface scattering experiments and theoretical direct dynamics based on density functional theory calculations are used to investigate hyperthermal collisions between O((3)P) and highly oriented pyrolytic graphite (HOPG). The simulations suggest that the HOPG surface becomes functionalized with epoxide groups. In…
In the present work, porous silicon (PS) based Bragg reflectors are fabricated, and the reactive PS surface is passivated by means of thermal carbonization (TC) by acetylene decomposition. The gas sensing properties of the reflectors are studied with different gas compositions and concentrations. Based on the results…
PURPOSE: To examine the positive reporting bias regarding the link with gadolinium (Gd) exposure and nephrogenic systemic fibrosis (NSF) in patients with renal impairment. This link has impacted strongly the international radiology safety guidelines. We believe that positive reporting bias has prevailed in the literat…
We investigate the electronic band structure of an undoped graphene armchair nanoribbon. We demonstrate that such nanoribbon always has a gap in its electronic spectrum. Even if the parameters of the noninteracting Hamiltonian are fine tuned to a point where single-electron calculations predict a metallic dispersion,…
The metal−support interface is known to play a key role in many catalysis reactions. Using the microemulsion technique we report the preparation of a nanosized noble metal particle with an intimate contact with cerium oxide. The materials display better catalytic performance in the water−gas shift (WGS) reaction over…
Single-walled carbon nanotubes functionalized with generation ( n ) 0−2 dendritic poly(amidoamine) (denoted as SWNTs-G n -NH 2, n = 0, 1, or 2) were used as filler in thermosetting epoxy to prepare anisotropic microscale diameter fibers by reactive spinning. Dendritic poly(amidoamine) (PAMAM) was “grafted from” acid-m…
Type A gelatins were extracted from skins and bones of lizardfish and analyzed to determine their functional and chemical properties. Lizardfish skin gelatin had ash content of 2.2 +/- 0.3% while bone gelatin had ash content of 12.2 +/- 0.2%. Gel strength was 159.1 +/- 14 and 135 +/- 7.9 g, respectively, for skin and…
This paper reviews the current status of free-air ionization chamber standards for the determination of air kerma in low- and medium-energy x-rays. It describes the underlying definitions and concepts that permit the air kerma to be determined from a measurement of the charge produced in a free-air chamber. The most c…