Materials Literature
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A division-of-amplitude photopolarimeter (DOAP) is described that uses a dielectric parallel-slab (PS) beam splitter that is coated with a high-reflectance metal on one side at oblique incidence. The instrument matrix of the PS DOAP is nonsingular, hence all four Stokes parameters can be measured simultaneously over a…
Improved nonlinear organic chromophores of varying conjugation length with either thiobarbituric acid or 3-dicyanomethylene-2,3-dihydrobenzothiophene-1,1-dioxide (FORON® Blue) acceptors have been synthesized and investigated for their nonlinear optical properties. Very large quadratic hyperpolarizabilities β(-2ω;ω,ω)…
Abstract We have measured Raman scattering and optical absorption spectra of layered β‐GeS 2 at pressures up to 15GPa. Frequency shifts of selected internal bond bending and stretching modes are discussed, and three external (rigid‐layer) modes are identified. Changes in the Raman spectra near 9 GPa clearly indicate a…
A hybrid multigroup/continuous-energy Monte Carlo algorithm is developed for solving the Boltzmann-Fokker-Planck equation. This algorithm differs significantly from previous charged-particle Monte Carlo algorithms. Most importantly, it can be used to perform both forward and adjoint transport calculations, using the s…
Abstract This paper describes the determination of accurate solubility parameters for nonpolar rubbers according to a GLC-method developed by Guillet. The data obtained provide a simple but meaningful thermodynamic characterization of the contribution of microstructure units and comonomers (styrene) in polydienes. On…
Measurements of the temperature-dependent resistivity of high-mobility GaAs/GaAlAs heterojunctions are used to measure the effective mass of Composite Fermions (CF). The CF effective mass is found to increase approximately linearly with the effective field up to effective fields of 14 T. Data from all fractions around…
Abstract The mechanism of biscitraconimides (BCI) as antireversion agents for sulfur vulcanized diene rubber was investigated choosing squalene as a model substrate. Curing of squalene with sulfur in the presence of accelerator, activator and BCI at 170°C gave BCI bridged adducts. The products were identified by spect…
Ecotin, a homodimeric protein composed of 142 residue subunits, is a novel serine protease inhibitor present in Escherichia coli. Its thermostability and acid stability, as well as broad specificity toward proteases, make it an interesting protein for structural characterization. Its structure in the uncomplexed state…
For an assembly of small noninteracting ellipsoidal particles the effect of the shape distribution function on light absorption is considered. Possible determinations of the function parameters from experimental absorption spectra are analyzed. Some features of the problem are discussed that are characteristic of asse…
The in vivo biocompatibility and biodegradation of cross-linked (co)polyethers with and without tertiary hydrogen atoms in the main chain and differing in hydrophilicity were studied by means of subcutaneous implantation in rats. After 4 days, 1 month, and 3 months postimplantation, the tissue reactions and interactio…
This proof-of-concept research describes a novel membrane-based, integrated absorber−reactor operat ing at ambient temperature and atmospheric pressure. It degrades volatile organic compounds (VOCs) in a gaseous stream by ozonation in an inert stagnant fluorocarbon (FC) phase having a high ozone solubility. This FC ph…
We report transport measurements with field and current parallel to the a axis (perpendicular to the conducting plane) in the organic superconductor \ensuremath{\kappa}--(BEDT-TTF${)}_{2}$Cu(NCS${)}_{2}$. The magnetoresistance displays a peak effect as a function of field and temperature with the peak fields increasin…
The p - n junction p-CuI/nano-porous n- made by coating CuI on a nano-porous film of n- does not show a photocurrent action spectrum corresponding to the bandgap excitation of . However, if the surface is lightly coated with the dye cyanidin the peak corresponding to bandgap excitation of is clearly manifested in addi…
Abstract Phosphate rock (PR), coal combustion by‐product (CCBP), limestone, and organic materials are promising amendments for low P, acid soils, and two or more of the amendments are commonly applied to improve crop yields in acid soil. However, the interactions between these amendments in acid soil are not fully und…
Per-N-tosylated 3,8-diaza-1,10-decanediamine (9), 4,9-diaza-1,12-dodecanediamine (spermine) (10) and 3,6,9,14,17,20-hexaaza-1,22-docosanediamine (11) were prepared by treating mono-BOC-protected, per-N-tosylated 1,2-ethanediamine (5), 1,3-propanediamine (6) and triethylenetetraamine (7), respectively, with 1,4-dibromo…
We report a theoretical study of various structures of chiral nematic liquid crystals, confined to submicrometer cylindrical cavities with tangential anchoring conditions. The Frank-Oseen free energy with additional surface energy terms is used to find nematic director fields, free energies, and stability diagrams of…
Abstract A series of smectic C * liquid‐crystalline (LC) block copolymers were successfully synthesized via the living anionic polymerization of polystyrene with optically active methacrylate monomers containing ( S )‐2‐methylbutyl 4‐(4‐hydroxyphenylcarbonyloxy)‐biphenyl‐4′‐carboxylate mesogens. These materials are th…
The effect of non-tetrahedral cations on the silicon–oxygen vibrational modes in complex silicates was modelled in a small-cluster approximation by introducing a shell containing first- and second-order neighbours of the peripheral oxygen atoms of the Si—O cluster. As an example, the proposed method was applied to stu…
To unravel the effects of the volume-excluding central core and the mesogenic pendant group on both the glass-forming ability and morphological stability of the thermally quenched glass, nine model compounds were synthesized that contain various nematogenic and cholesteryl pendant groups. The glass-forming ability of…
Abstract It is known that chromium influences the growth of an alumina oxide layer on β‐NiAl at high temperatures. It has been claimed that oxidized chromium will act as nuclei for the θ → α‐alumina phase transformation. This study presents RBS‐data on the presence of chromium in the oxide scale which tends to substan…