Materials Literature
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A dense alumina‐silicon carbide (Al 2 O 3 –SiC) nanocomposite was synthesized in situ from the reaction of mullite, aluminum, and carbon by reactive hot pressing (RHP). Transmission electron microscopy investigation showed that in situ ‐formed, nanometer‐sized SiC particles were mainly entrapped in the matrix grains,…
Abstract SER(R)S spectra with high signal intensity of Nile Blue A sulfate and 1,1′‐diethyl‐2,2′‐cyanine iodide present in low concentration (≤0.05 µ M ) can be recorded by employing certain silver sols in the absence of any chloride and without highly aggregated particles. The sols have been prepared by reduction of…
The synthesis, catalytic properties, UV-visible spectra and electrochemistry of β-pyrrole brominated porphyrins are summarized in this brief review. The effect of the Br substituents of the porphyrin ring on the redox behavior, and on axial CO or pyridine binding to the porphyrins is also discussed.
Photonic crystals, frequency-selective surfaces, gratings, and many so-called metamaterials are composed of periodic arrangements of objects. Such an arrangement of objects quickly forms a periodic waveguide. In this paper, we investigate a number of properties of the eigenmodes in general periodic waveguides using th…
The output force–strain relationship typical of the performance of Terfenol-D transducers under varied operating conditions is examined to study transducer blocked-force characteristics. The design and construction of a transducer for testing under controlled thermal, magnetic and mechanical load conditions are descri…
Abstract This paper describes a rare occurrence of nontronite associated with sulfide-bearing felsic metavolcanics, providing evidence of colloidal deposition in open spaces as result of a low-temperature water-rock interaction. Microbotryoidal masses of green nontronite with impurities of kaolinite, illite, barite, a…
The Rákos-stream is a small stream near Budapest (Hungary). The water of the stream is considerably polluted with communal and industrial wastewaters. In May and September 2001 benthic diatom samples were collected along the stream, in May from the surface of available water plants and gravel. In September samples fro…
Abstract The tensile properties of cross‐linked and uncross‐linked composite films (thickness ∼20–35 μm) prepared from Hydroxypropylcellulose (HPC) with incorporation of microcrystalline cellulose fibers (Avicel) were studied. The concentration of fibers in the composites ranged from 0 to 30 w/w% and cross‐linked comp…
Water-soluble porphyrins tend to form self-aggregates under certain conditions. The structure of the self-aggregate (H-type dimer, H-type higher aggregate, or J-aggregate) sensitively depends on the structure of the peripheral substituents at the meso-positions of the porphyrin. Water-soluble porphyrins also form rela…
In order to investigate transient space charge phenomena, it is essential that the space charge profile be observed at a high repetition rate. We have developed a new space charge measurement system using the pulsed electroacoustic (PEA) method, which can measure the space charge profiles every 10 /spl mu/s. It employ…
The ability of three-way catalysts (TWCs) to effectively remove CO and NO x from the exhaust is directly controlled by the air-fuel ratio at which the accompanying engine is operated. In a stoichiometric engine, small variations in the air-fuel ratio have large effects on the catalyst performance. These effects includ…
Abstract The effect of fluoride ion concentration and pH on the corrosion behavior of TCA (60 Ti 10 Ag 30 Cu), which is a new Ti alloy with low melting point, pure Titanium (Ti), and TAV (TiAl6V4) was examined using open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) at different potentials.…
The objective of this study was to determine some of the properties of experimental particleboard panels made from black locust (Robinia pseudoacacia L.). The furnish contained soundwood, partially decayed wood, branchwood, and bark that was mixed at different ratios and used to manufacture 30 panels. Modulus of elast…
We report the first systematic study of H 2 O speciation in dacitic melt with total dissolved H 2 O ranging from 1.4 to 2.6 wt%. Samples were heated in a one-atmosphere tube furnace at 480-590 °C for certain durations and then quenched in water or air. Species concentrations were measured with Fourier transform infrar…
Abstract It is shown that sol‐gel alumina calcined at 400 0 C is a very efficient catalyst for the epoxidation of cyclohexene and cyclooctene with aqueous 70 wt % hydrogen peroxide. The overall yield per g of catalyst was 0.28 mol of cyclohexene oxide in 5 cycles of 450 min each and 0.43 mol of cyclooctene oxide in 4…
Microscale Laser Shock Peening (LSP) is a technique that can be potentially applied to manipulate the residual stress distributions in metal film structures and thus improve the reliability of micro-devices. This paper reports high-spatial-resolution characterization of shock treated copper thin films on single-crysta…
The optical power spectrum of a signal externally modulated using a Mach-Zehnder modulator is calculated analytically. Optical power spectra are calculated for binary signals for which the drive signal has either raised-cosine or Bessel-filtered pulse shape as well as for duobinary signals created by Bessel filtering.…
Abstract Coordination-organized porphyrin dimers of 5,15-bis[2-(allyloxycarbonyl)ethyl]- and bis[3-(allyloxy)propyl]-20-(1-methyl-2-imidazolyl)porphyrinatozinc were covalently linked by an intramolecular olefin metathesis reaction in excellent yields (93–98%). It was found that the yields of the intramolecular metathe…
For many, the thought of terrorists detonating a dirty bomb--a radiological dispersal device--is frightening. However, the radiation health risks from such an occurrence are small. For most people directly involved, the exposure would have an estimated lifetime health risk that is comparable to the health risk from sm…
Abstract A novel cyan‐bridged macrocyclic nickel complex [{NiL 1 }{Fe(bipy)(CN) 4 }]2·5H 2 O 1 (L 1 = 3,10‐dimethyl‐1,3,6,8,10,12‐hexaazacyclotetradecane, bipy = 2,2‐bipyridine) was synthesized and structurally characterized. The complex exhibits one‐dimensional zigzag chain structures. Each ferrous(II) ion connects t…