Materials Literature
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In situ Raman scattering measurements have been obtained for vitreous ${\mathrm{ZnCl}}_{2}$ compressed isothermally to 25 GPa. The Raman spectra indicate that, in contrast to other tetrahedral framework glasses, when compressed at room temperature glassy ${\mathrm{ZnCl}}_{2}$ crystallizes to the high-pressure ${\mathr…
Two previously unreported low-temperature structures of chlorine on silver(111) are discussed: the sharp Ag(111)−(√3 × √3)R30°−Cl, which disorders above 195 K and a split spot pattern assigned as Ag(111)−(13 × 13)−Cl. The latter surface is also disordered at room temperature and gives a diffuse pattern reminiscent of…
X-ray photoelectron spectra are reported for ordered and disordered chain conformations of poly(ethylene glycol) and poly(tetramethylene glycol). Both polymers show a conformational dependent intensity change at the top of the (C 2s + O 2s) band of the valence level spectrum, which is interpreted as due to changes in…
A prototype oxide thermoelectric element has been fabricated for the first time, for the application of power generation at high temperatures in air. Sintered bodies of Li 0.025 Ni 0.975 O(p-type) and Ba 0.4 Sr 0.6 PbO 3 (n-type) were directly joined under the uniaxial pressure of 4 MPa at 1123 K for 10 h in air. The…
Low-temperature vesuvianites crystallize in the two space groups P4/n or P4nc due to different arrangements of Ca-dodecahedra and M 2+,3+ square pyramids that form strings along the fourfold axes. Long-range ordered vesuvianites of acentric P4nc symmetry may have the same diffraction symmetry as centrosymmetric disord…
Abstract— Recently, it was found that some materials doped with rare‐earth ions show bright and long‐lasting phosphorescence. They do not include radioactive elements and can be safely used as luminous paints for use in the dark. Some of them are better than the traditional zinc sulfide doped with copper (ZnS:Cu). The…
Thin films of phenylphosphine oxide-containing polymers were exposed to low Earth orbit aboard a space shuttle flight (STS-85) as part of flight experiment designated Evaluation of Space Environment and Effects on Materials (ESEM). This flight experiment was a cooperative effort between the NASA Langley Research Cente…
The strength of yams spliced under different conditions is investigated. Statistical models that help predict the strength of the splices under different splicing and yarn parameters are established, and the optimum splicing conditions (optimizing both the splicer and the yam parameters) are investigated. The results…
The lamellar phase in diblock copolymer systems appears as a result of a competition between molecular and entropic forces, which selects a preferred periodicity of the lamellae. Grain boundaries are formed when two grains of different orientations meet. We investigate the case where the lamellae meet symmetrically wi…
The interaction domain for cytochrome c on the cytochrome bc(1) complex was studied using a series of Rhodobacter sphaeroides cytochrome bc(1) mutants in which acidic residues on the surface of cytochrome c(1) were substituted with neutral or basic residues. Intracomplex electron transfer was studied using a cytochrom…
We present results of Monte Carlo simulations for dilute to concentrated solutions of athermal, homogeneous dendritic polymers. The dendritic polymers are composed of tangent hard-spheres and vary from generation 0 to generation 5. These simulations investigate the effect of hyperbranching on the structure and thermod…
Normal coordinate analyses for 2-, 3- and 4-acetylpyridine and acetophenone were carried out employing a systematic procedure based on a modified valence force field that is comparable to those used previously for different aromatic molecules. The general valence force fields (GVFF) were determined using a set of 41 p…
We report the detailed temperature variation of the dielectric constant across the nematic-isotropic transition in both the normal and UV-irradiated states of a commercially available room temperature nematic mixture (E7 from E-Merck) doped with a small quantity (4.5 mol %) of a liquid crystalline azo compound. The ph…
A cube-shaped cluster, TiRu3S4, is derived from the selective combination of hetero- and homodinuclear fragments TiRuS2 and Ru2S2, respectively (see scheme). The clusters exhibit a fluxional, temperature-dependant behavior, ascribed to the proximity of Ru centers. [Ru]=Cp*Ru, [Ti]=CpTi.
New types of crystal structures with new physical properties such as energy harvesting can be engineered by exploiting the potentiality of chiral recognition. In the proposed strategy one takes advantage of the possibility that in true racemates one enantiomeric component in the crystal packing may be replaced by a di…
In this paper, effects of rotor abnormalities such as broken squirrel-cage bars, broken cage connectors and airgap eccentricity on ohmic and core losses of induction motors are presented. In this investigation, a comprehensive time-stepping coupled finite element-state space (TSCFE-SS) model was fully utilized to comp…
Hard lead zirconate titanate (PZT) and PZT/Al 2 O 3 composites were prepared and the alternating‐electric‐field‐induced crack growth behavior of a precrack above the coercive field was evaluated via optical and scanning electron microscopy. The crack extension in the 1.0 vol% Al 2 O 3 composite was significantly small…
Copper has received considerable attention during the past few years because of its low electrical resistivity, high melting temperature, and high electromigration resistance. Since electrochemical plating has several advantages compared to physical vapor deposition and chemical vapor deposition due to its low cost an…
Conductive polymer composites showing large positive temperature coefficient (PTC) are made of semi-crystalline polymer as an insulator and a conducting filler, whose concentration is close to the critical volume fraction. In this study, the resistivity and PTC behavior of high density polyethylene (HDPE) filled with…
Laser-ablated copper atoms react with NO molecules in excess neon and argon during condensation to form the CuNO and Cu(NO) 2 complexes as major products and Cu(NO) 2 (NO)* as a minor product. In addition, the CuNO + cation and Cu(NO) 2 - anion are also formed. The product absorptions are identified from isotopic shif…