General ray-tracing formulas for crystal
I develop a new method of ray tracing that can be used to analyze the refraction or reflection of rays by both uniaxial and biaxial crystals.
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Synthesis and NMR study of 9′‐substituted spiroindolinonaphthoxazine derivatives
Abstract A photochromic spiroindolinonaphthoxazine derivative, 1,3,3‐trimethyl‐9′‐hydroxy‐spiro[indoline‐2,3′(3 H )‐ naphtho[2,1‐ b ][1,4]oxazine] 3 was synthesized by condensation of 1,2,3,3‐tetramethylindolenium iodide 1 and l‐nitroso‐2,7‐dihydroxynaphthalene 2 . Further, two new derivatives, 5 and 7 , were prepared…
Complex permittivity of the deuterated and undeuterated proton glassRb1−x(NH4)xH2AsO4
Dielectric measurements have been performed in both the deuterated and undeuterated proton glass rubidium ammonium dihydrogen arsenate ${\mathrm{Rb}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$(${\mathrm{NH}}_{4}$${)}_{\mathit{x}}$${\mathrm{H}}_{2}$${\mathrm{AsO}}_{4}$ along the tetragonal a axis. Ammonium concentrations x…
Polarization study and crystal-field analysis of the laser-selective excitation spectra ofHo3+ions inCaF2andSrF2crystals
The polarized fluorescence of a total of 12 ${\mathrm{Ho}}^{3+}$ ion centers present in ${\mathrm{CaF}}_{2}$- and ${\mathrm{SrF}}_{2}$-type crystals and having a variety of ${\mathrm{Ho}}^{3+}$ ion symmetries has been analyzed to give possible model assignments. In contrast to the earlier results for ${\mathrm{SrF}}_{…
Enhanced oxygen precipitation in electron irradiated silicon
The precipitation of oxygen has been investigated for 2 MeV electron irradiated silicon samples, with irradiation doses 1015–1018 cm−2, at an annealing temperature of 900 °C for up to 444 h. The samples initially contained either different concentrations of the vacancy-oxygen (VO) center created at the irradiation, or…
Phase and crystallization behavior of solution‐blended poly(ether ether ketone) and poly(ether imide)
Abstract Results on solution‐blended poly(ether ether ketone) (PEEK) and poly(ether imide) (PEI) blends are reported. Dichloroacetic acid was used as the cosolvent for blending. PEEK and PEI are confirmed to be miscible in the melt. The glass transition, T g , behavior obeys the simple Fox equation or the Gordon‐Taylo…
Reduction of systemic exposure and toxicity of cisplatin by encapsulation in poly-lactide-co-glycolide.
The tissue distribution and normal tissue toxicity of cisplatin (cDDP) administered as poly-lactide-co-glycolide (PLAGA) microspheres, developed for loco-regional administration of cDDP to the liver, were studied in Wag/Rij rats. Venoportal administration of this formulation resulted in a reduction in total systemic a…
Creep of 6H α‐Silicon Carbide Single Crystals
The compressive creep behavior of single‐crystal 6H α‐SiC was measured for orientations parallel to and at 45° to [0001]. Deformation of the 45° orientation was dominated by basal slip. Steady‐state creep rates above 10 ‐7 /s were measured at temperatures as low as 800°C. An activation energy of 277 kJ/mol and a stres…
Electronic spectrum of allyl and allyl-d5 radicals: the B[12A1] .rarw. X[12A2], C[22B1] .rarw. X[12A2], and D[12B2] .rarw. X[12A2] band systems
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic spectrum of allyl and allyl-d5 radicals: the B[12A1] .rarw. X[12A2], C[22B1] .rarw. X[12A2], and D[12B2] .rarw. X[12A2] band systemsJoel A. Blush, David W. Minsek, and Peter ChenCite this: J. Phys. Chem. 1992, 96, 25, 10150–10154Publication Date (Print):December 1…
Liquid Wetting, Transport, and Retention Properties of Fibrous Assemblies: Part II: Water Wetting and Retention of 100% and Blended Woven Fabrics
The liquid wetting and retention properties of cotton, polyester, and their blends and other woven fabrics, each containing a single fiber type, were investigated using a previously established method. Several aspects of liquid retention properties of woven fabrics were discussed, i.e., distribution of liquid uptake,…
Perspectives on the production of polyhydroxyalkanoates in plants
Poly-β-hydroxybutyrate (PBH) was recently shown to be produced in genetically engineered plants which expressed the genes from Alcaligenes eutrophus responsible for the formation of PHB from acetoacetyl-CoA. The transgenic plants accumulated PHB as granules which were similar in size and appearance to the bacterial PH…
The Metallurgy of Gold
The discovery of gold about 7000 years ago together with that of its sister metals from group IB of the periodic table can be said to have laid the early foundations of metallurgy as a science and a technology. The attraction of the metal to man derives from its relative scarcity and high value, its excellent corrosio…
Prediction of the solubility of polar polymers by means of interfacial tension combining rules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrediction of the solubility of polar polymers by means of interfacial tension combining rulesC. J. Van Oss and R. J. GoodCite this: Langmuir 1992, 8, 12, 2877–2879Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 Dece…
Photophysics and photochemistry of 22.pi. and 26.pi. acetylene-cumulene porphyrinoids
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysics and photochemistry of 22.pi. and 26.pi. acetylene-cumulene porphyrinoidsDaniel O. Martire, Norbert Jux, Pedro F. Aramendia, R. Martin Negri, Johann Lex, Silvia E. Braslavsky, Kurt Schaffner, and Emanuel VogelCite this: J. Am. Chem. Soc. 1992, 114, 25, 9969–9978P…
Monte Carlo simulations of secondary electron emission from CsI, induced by 1–10 keV x rays and electrons
A model for electron transport and emission in CsI is proposed. It is based on theoretically calculated microscopic cross sections for electron interaction with the nuclear and the electronic components of the solid. A Monte Carlo program based on this model was developed to simulate secondary electron emission induce…
Terminal and segmental relaxations in epoxidized polyisoprene
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTerminal and segmental relaxations in epoxidized polyisopreneC. M. RolandCite this: Macromolecules 1992, 25, 25, 7031–7036Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December 1992https://pubs.acs.org/doi/10.1021/…
Toward a determination at near atomic resolution of two-dimensional crystal structures of amphiphilic molecules on the water surface: a study based on grazing incidence synchrotron x-ray diffraction and lattice energy calculations
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward a determination at near atomic resolution of two-dimensional crystal structures of amphiphilic molecules on the water surface: a study based on grazing incidence synchrotron x-ray diffraction and lattice energy calculationsFranck Leveiller, Didier Jacquemain, Leslie L…
Decomposition of X-Ray Diffraction Patterns: A Convenient Way to Describe Complex I/S Diagenetic Evolution
Abstract Decomposition of complex X-ray diffraction profiles is used on well characterized (image analysis of transmission electron micrographs, X-ray fluorescence chemical analyses) diagenetic samples from the Paris basin. The simultaneous occurrence of three “illitic” phases (mixed-layer illite/smectite or I/S, poor…
The continuing development of low-energy electron microscopy for characterizing surfaces
Instrumental aspects of low-energy electron microscopy are reviewed with a view toward the future evolution of this reemergent technology. Both elastically scattered and inelastically excited electrons in the 0–1000-eV range may be used to form direct rather than scanned images of surfaces in the 3–10-nm resolution ra…
Nonresonant-Type Third-order Nonlinearity of (PbO, Nb2O5)-TiO2-TeO2 Glass Measured by Third-Harmonic Generation
Nonresonant-type third-order nonlinearity of high refractive index PbO-TiO 2 -TeO 2 and Nb 2 O 5 -TiO 2 -TeO 2 glass has been evaluated by means of third-harmonic generation. The PbO-containing glass show higher χ (3) than Nb 2 O 5 -containing glass, and the largest χ (3) of 3.7×10 -12 esu is obtained for 10 mol%PbO-1…