Materials Literature
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Stator winding vibration is the most common cause of unexpected failure of high-voltage (HV) generators. Stator bars are generally fixed in slots by using slot wedges and a side packing system. Loose slot wedges could result in excessive vibration of the stator bars, which would accelerate the deterioration of the gro…
The complex (nixantphos)Ir(cod)Cl·CH2Cl2(0.5C7H8) 3 has been synthesized and structurally characterized by NMR, IR, and single crystal X-ray diffraction. The coordination around Ir is trigonal bipyramidal with both P groups of the nixantphos bound in a bis-equatorial mode. The bis-chelating cod (C8H12) occupies the re…
The monosubstituted thioxopeptide Boc-Ala-Pro-psi(SCNH)-Aib-Ala-OMe is investigated by time-resolved UV-pump/IR-probe and IR-pump/IR-probe spectroscopy, steady-state FTIR-spectroscopy, and NMR-techniques. The compound has a high propensity to adopt a i-->i+3 hydrogen-bonded conformation. Time-resolved infrared measure…
The development of monodisperse crystalline particles in cordierite glass doped with Cr 3+ after a two-step heat treatment is elucidated by a combination of time-resolved small and wide angle x-ray scattering (SAXS/WAXS) experiments with electron microscopy. The effects of bulk and surface crystallization can clearly…
A series of poly(4-vinylpyridine)- b -poly(ε-caprolactone) (P4VP-PCL) diblock copolymers of different composition (namely, various nanostructured phases) were synthesized for hybridization with gold precursors. Interesting phase behavior of gold precursors/P4VP-PCL hybrids was found as evidenced by transmission electr…
A morphological transition of asymmetric poly(styrene- b -acrylic acid) (PS- b -PAA) films is observed by in situ scanning probe microscopy (SPM) in aqueous media. Upon initial exposure to buffer solution at pH 7.4, spherical PAA domains swell through a glassy PS surface layer to form negatively charged mushroom caps.…
The structure of polyelectrolyte multilayer films adsorbed onto either a per-protonated or per-deuterated 11-mercaptoundecanoic acid (h-MUA/d-MUA) self assembled monolayer (SAM) on gold was investigated in air using two surface vibrational spectroscopy techniques, namely, reflection absorption infrared spectroscopy (R…
We report that the thermal strain due to the thermal-expansion difference between a Mn film and a semiconductor substrate is strong enough to overcome the thermal energy for a paramagnetic (PM) state and also to break antiferromagnetic (AF) magnetic symmetry, inducing ferromagnetic (FM) ordering at high temperatures.…
Abstract Broad (Al,In)GaN laser diodes (LD) with ridge widths of some micrometers show up multi mode patterns. We analyze (Al,In)GaN LDs with different ridge widths in the UV and blue spectral regime simultaneously with temporal, spectral and spatial resolution in the near‐ and far‐field. We transform the laser beam o…
When concrete is sprayed during shotcreting, inevitably some material is lost due to rebound. The relative losses for coarse aggregates and fibers are higher than that for the rest, and therefore the composition of the material in-place is deficient in these phases. In order to compensate for such loss and indeed to m…
We report the synthesis and the characterization of ${\text{PrMn}}_{7}{\text{O}}_{12}$, a new manganite with multiple (quadruple) perovskite structure of general chemical formula: $A{A}_{3}^{\ensuremath{'}}{B}_{4}{\text{O}}_{12}$. This family of manganites is extremely interesting and is attracting a great attention;…
We report on shelled bubbles that can be manipulated with magnetic fields. The magnetic shell consists of self-assembled magnetic nanoparticles. The magnetic susceptibility of the bubbles is proportional to the surface area, ${\ensuremath{\chi}}_{b}=(9\ifmmode\pm\else\textpm\fi{}3\ifmmode\times\else\texttimes\fi{}{10}…
The magnetic and transport properties of bulk polycrystalline samples of double perovskite SrLaVMoO 6 have been investigated. Structural analyses have shown that the samples are almost in single phase with an ordered double perovskite structure. Magnetization versus temperature measurements have indicated that the SrL…
Abstract Thin palladium membranes of different thicknesses were prepared on sol‐gel derived mesoporous γ‐alumina/α‐alumina and yttria‐stabilized zirconia/α‐alumina supports by a method combining sputter deposition and electroless plating. The effect of metal‐support interface on hydrogen transport permeation propertie…
This paper presents vibration and position control of a flexible beam structure by adopting shape memory alloy (SMA) wire actuators. The governing equation of motion of the proposed flexible structure is obtained via Hamilton's principle. The dynamic characteristics of the SMA wire actuator are experimentally identifi…
Abstract Important physical properties such as yield strength, elastic modulus, and thermal conductivity depend on the material microstructure. Realization of optimal microstructures is important for hardware components in aerospace applications where there is a need to optimize material properties for improved perfor…
Closely packed carbon nanotube (CNT) bundles are expected to have higher conductivity than copper and could potentially replace copper for electrical and thermal conductors in IC chips. However, it is extremely difficult, if not impossible, to controllably grow closely packed CNT bundles. We report on a novel postgrow…
The phase transitions of α-calcium sulfate hemihydrate (α-HH) in KCl solutions were studied at (80 to 105) °C under atmospheric pressure in an attempt to estimate the metastability of α-HH and to sketch out the routes for α-HH’s hydration, dehydration, or recrystallization. The crystal water content and morphology of…
Telechelic star polymers are macromolecules with functionalized, mutually attractive end groups. We employ computer simulations on a lattice to investigate the phase behavior of trifunctional telechelic stars as a function of the fraction lambda of attractive terminal monomers. We find macrophase separation that disap…
The mechanistically diverse enolase superfamily is a paradigm for elucidating Nature's strategies for divergent evolution of enzyme function. Each of the different reactions catalyzed by members of the superfamily is initiated by abstraction of the alpha-proton of a carboxylate substrate that is coordinated to an esse…