Materials Literature
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We present a thermodynamics argument against a strictly linear temperature dependence of the magnetic penetration depth, which applies to superconductors with arbitrary pairing symmetry at low temperatures.
We study hysteresis for a two-dimensional, spin-1/2, nearest-neighbor, kinetic Ising ferromagnet in an oscillating field, using Monte Carlo simulations and analytical theory. Attention is focused on small systems and weak field amplitudes at a temperature below $T_{c}$. For these restricted parameters, the magnetizati…
The bonding between two M(dmit)(2) monomers (M = Ni, Pd, Pt) in the stacks that are characteristic for the crystal structure of these compounds has been analyzed, using decomposition of the interaction energy in steric repulsion, electron pair bond formation, and donor-acceptor interactions. Atom over atom (eclipsed)…
This work has synthesized new diamantane-based polyimides by reacting 1,6-bis(4-aminophenyl)diamantane ( 5 ) with various aromatic tetracarboxylic dianhydrides. Dynamic mechanical analysis (DMA) reveals that diamantane-based polyimides have three relaxations on the temperature scale between 0 and 500 °C. The low-tempe…
Optical absorption and extended X-ray absorption fine structure (EXAFS) spectra were measured on series of ZrF 4 −BaF 2 −LaF 3, ZrF 4 −BaF 2 −MF−LaF 3 (M; Li, Na, K, Rb, or Cs) and AlF 3 −BaF 2 −CaF 2 −YF 3 glasses doped with Ni 2+ . The optical absorption spectra show that Ni 2+ ions in all the glasses exist in octah…
The influence of the Ni deposition mode on the dispersion of Ni 2+ precursors was investigated in the preparation of Ni/SiO 2 catalysts. The coordination sphere of Ni complexes was mainly studied by XAFS spectroscopy in the initial step (dried samples) and after a vacuum activating treatment at 700 °C. Four modes of d…
The oxygenase domain (amino acids 1-498) of inducible nitric oxide synthase (iNOSox) is a hemeprotein that binds L-arginine (L-Arg) and tetrahydrobiopterin (H4B). During NO synthesis, the heme iron must bind and activate O2, but it also binds self-generated No to form an inactive complex. To better understand how L-Ar…
Freshly vacuum-evaporated, neat amorphous MoO 3 thin films exhibit only UV photochromism. Visible-light photochromism is induced in these films when they are cathodically polarized for a short duration in a nonaqueous electrolyte. The efficiencies of the UV and visible-light photochromism of the MoO 3 thin films incre…
The Förster resonance energy transfer (FRET) between 6-carboxyfluorescein (6-CF) (donor) and rhodamine B-labeled melamine formaldehyde (RhB-MF) particles (acceptor) in aqueous solution was exploited to investigate the layer properties of polyelectrolyte (PE) multilayers preadsorbed on the particle surface. The formati…
Until recently, anyone who needed to accurately identify marine phytoplankton had one of four choices: use the outdated Englishlanguage volumes by E. E. Cupp and N. I. Hendey plus the more recent book by J. Dodge, acquire a working knowledge of German and use the old volumes by Schiller and Hustedt, spend huge amounts…
Stacking of poly(3-alkylthiophene)s P3RThs and poly(4-alkylthiazole)s P4RTzs has been studied. Light scattering analysis indicates that head-to-tail (HT) type HT-P3HexTh (R = n -C 6 H 13 ) gives a degree of depolarization (ρ v ) of 0.26 in CHCl 3, which reveals that HT-P3HexTh takes a stiff structure even in the good…
<div class="htmlview paragraph">As part of projects conducted for the PolyUrethanes Recycle &amp; Recovery Council (PURRC), various equipment and processes have been utilized to isolate the useable polyurethane foam in post consumer automobile seats. The overall purpose of the project was to design a “turn k…
<div class="htmlview paragraph">The performance of the fast lightoff, ultra-short metal monolith (SMM) catalyst technology was evaluated in a laboratory rig capable of simulating automotive exhaust streams. Tests focused primarily on determining the lightoff behavior of the fresh and engine aged catalyst over a…
<div class="htmlview paragraph">New magnesium alloys based on Mg-Zn-Al-Ca quaternary system (ZAC alloys) have been developed by IMRA America, Inc. The 200-hour creep extension of the new ZAC alloys at 150°C and 35MPa is approximately one order of magnitude less than that of conventional Mg-Al based die cast allo…
A multichannel spectroscopic ellipsometer based on the rotating-compensator principle has been applied to obtain the evolution of spectra (1.5–4.0 eV) in the normalized Stokes vector of the light beam reflected from the surface of a nanocrystalline diamond film during growth. Spectra in the ellipsometry angles (ψ, Δ)…
<div class="htmlview paragraph">This work attempts a systematic investigation of the effects of flow maldistribution on the light-off behavior of a monolithic catalytic converter. To achieve this goal, a combined chemical reaction model and three-dimensional computational fluid dynamic modeling technique has bee…
<div class="htmlview paragraph">The local variation of the crankshaft's speed in a multicylinder engine is determined by the resultant gas-pressure torque and the torsional deformation of the crankshaft. Under steady-state operation, the crankshaft's speed has a quasi-periodic variation and its harmonic componen…
Raman scattering has been used to probe short-range structural information on lanthanum-doped lead titanate ceramics (LaxPb1−xTiO3) for x, ranging from 0.0 to 0.30. In highly doped samples (x&gt;0.27), x-ray diffraction measurements indicate a cubic structure, although measurements of Raman scattering at temperatu…
High-spin and low-spin complexes of the iron(III) tetrakis( meso -cyclohexyl)porphyrin ((TCHP)Fe III ) have been studied by means of 1-D and 2-D 1 H NMR. The complete assignment of porphyrin and R-imidazole 1 H resonances has been done on the basis of 2-D COSY and NOESY techniques as well as by selective deuteration o…
<div class="htmlview paragraph">A 2-D CFD model was developed to describe the heat transfer, and reaction kinetics in a honeycomb structured ceramic diesel particulate trap. This model describes the steady state as well as the transient behavior of the flow and heat transfer during the trap regeneration processe…