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Spectroscopic studies of radiative transitions and upconversion characteristics of Er^3+ ions in simple pseudoternary fluoride glasses MF_n–BaF_2–YF_3 (M: Zr, Hf, Al, Sc, Ga, In, or Zn)

Setsuhisa Tanabe、Kazuki Takahara、Masahide Takahashi 等 4 位作者1995-05-01Journal of the Optical Society of America B

Optical properties of Er3+ -doped fluoride glasses in the pseudoternary systems MFn–BaF2–YF3, where M is Zr, Hf, Al, Sc, Ga, In, or Zn, were investigated, and the variation of the local structure was discussed. Of the three Judd–Ofelt Ωt parameters (t = 2, 4, 6) that dominate the f–f transition probabilities of Er3+ i…

Luminescence Properties of Advanced MaterialsGlass properties and applicationsSolid State Laser Technologies

Electrochemistry and Spectroelectrochemistry of .sigma.-Bonded Iron(III) Porphyrins with Nonplanar Porphyrin Rings. Reactions of (OETPP)Fe(R) and (OETPP)FeCl, Where R = C6H5, C6F4H, or C6F5 and OETPP Is the Dianion of 2,3,7,8,12,13,17,18-Octaethyl-5,10,15,20- tetraphenylporphyrin

Karl M. Kadish、Eric Van Caemelbecke、Francis D’Souza 等 7 位作者1995-05-01Inorganic Chemistry

A variety of nonplanar σ-bonded phenyl- and (fluorophenyl)iron(III) porphyrins are characterized as to their electrochemical and spectroscopic properties in nonaqueous media. The investigated compounds are represented as (OETPP)Fe(R), where R = C6H5, C6F4H, or C6F5 and OETPP is the dianion of 2,3,7,8,12,13,17,18-octae…

Electrochemical sensors and biosensorsPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms

Calculation of phase diagrams not requiring the derivatives of the Gibbs energy demonstrated for a mixture of two homopolymers with the corresponding copolymer

Roland Horst1995-05-01Macromolecular Theory and Simulations

Abstract A method is presented which allows the calculation of phase diagrams (spinodal, binodal and tie lines) on the basis of the Gibbs energy of mixing Δ G . No derivatives of Δ G with respect to the composition variables are required. This method is particularly useful in cases where the composition dependence of…

Polymer crystallization and propertiesAdvanced Polymer Synthesis and CharacterizationBlock Copolymer Self-Assembly

Measurements of Refractive Indexes and Factors Affecting Dispersion in Oxide Glasses

Shigeru Fujino、Hiromichi Takebe、Kenji Morinaga1995-05-01Journal of the American Ceramic Society

Accurate refractive indexes of oxide glasses—silica, silicate, borate, aluminate, tellurite, antimonate, and heavy metal gallate glasses—are presented in the wavelength range 0.265 to 1.710 μm. Factors affecting the refractive index dispersion are discussed by using the single‐oscillator Drude‐Voigt equation. The valu…

Luminescence Properties of Advanced MaterialsGlass properties and applicationsMineralogy and Gemology Studies

Upconversion Luminescence in Er3+-Doped RbGd2Cl7 and RbGd2Br7

Toni Riedener、Karl W. Kraemer、Hans U. Guedel1995-05-01Inorganic Chemistry

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUpconversion Luminescence in Er3+-Doped RbGd2Cl7 and RbGd2Br7Toni Riedener, Karl Kraemer, and Hans U. GuedelCite this: Inorg. Chem. 1995, 34, 10, 2745–2752Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 May 1995https://pu…

Luminescence Properties of Advanced MaterialsPerovskite Materials and ApplicationsOptical properties and cooling technologies in crystalline materials

New Polyoxypregnane Ester Derivatives from Leptadenia hastata

Rita Patrizia Aquino、Cosimo Pìzza、Nunziatina De Tommasi 等 4 位作者1995-05-01Journal of Natural Products

Following the characterization of polyoxypregnane esters and esterified glycosides from the less polar extracts of Leptadenia hastata, 34 new congeners have been isolated from the more polar extracts. They possess sarcostin or deacetylmetaplexigenin as the aglycons and acetyl, benzoyl, cinnamoyl, nicotinoyl, and m-hyd…

Cancer Treatment and PharmacologyPhytochemistry and Bioactive Compounds

Exchange Alternation and Single-ion Anisotropy in The Antiferromagnetic Heisenberg Chain S = 1. Magnetic and Thermal Properties of the Compound Ni2(EDTA).cntdot.6H2O

J.J. Borrás-Almenar、Eugenio Coronado、Jacques Curély 等 4 位作者1995-05-01Inorganic Chemistry

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange Alternation and Single-ion Anisotropy in The Antiferromagnetic Heisenberg Chain S = 1. Magnetic and Thermal Properties of the Compound Ni2(EDTA).cntdot.6H2OJ. J. Borras-Almenar, E. Coronado, J. Curely, and R. GeorgesCite this: Inorg. Chem. 1995, 34, 10, 2699–2704Pub…

Magnetism in coordination complexesAdvanced NMR Techniques and ApplicationsInorganic Chemistry and Materials

Infrared corrected Sellmeier coefficients for potassium titanyl arsenate

D. L. Fenimore、Kenneth L. Schepler、Uma Ramabadran 等 4 位作者1995-05-01Journal of the Optical Society of America B

KTA is a crystallographic isomorph of KTP that shows promise for nonlinear frequency generation throughout the 1–5-μm region. We present updated Sellmeier coefficients for KTA based on measurements of the refractive index in the 0.4–3.6-μm region. Predictions of phase-matching behavior by means of these coefficients a…

Crystal Structures and PropertiesPhotorefractive and Nonlinear OpticsSolid-state spectroscopy and crystallography

DIATOMS IN SEDIMENT CORES FROM THE MESOHALINE CHESAPEAKE BAY, U.S.A.

Sherri R. Cooper1995-05-01Diatom Research

Diatoms were extracted from subsampled sections of four dated sediment cores collected in the mesohaline Chesapeake Bay, U.S.A. Over 400 species in 76 genera were identified. A complete list of the species identified from the cores is given, together with information on their relative abundance. Forty-six of the more…

Marine and coastal ecosystemsAquatic Ecosystems and Phytoplankton DynamicsDiatoms and Algae Research

Synthesis, Crystal Structure, and Properties of a New Imidazolate-Bridged Copper-Zinc Heterobinuclear Complex with Triethylenetetramine Ligands

Zong‐Wan Mao、Ming-Qin Chen、Xiangshi Tan 等 5 位作者1995-05-01Inorganic Chemistry

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Crystal Structure, and Properties of a New Imidazolate-Bridged Copper-Zinc Heterobinuclear Complex with Triethylenetetramine LigandsZong-Wan Mao, Ming-Qin Chen, Xiang-Shi Tan, Jie Liu, and Wen-Xia TangCite this: Inorg. Chem. 1995, 34, 11, 2889–2893Publication Date…

Metal-Organic Frameworks: Synthesis and ApplicationsMetal complexes synthesis and propertiesMagnetism in coordination complexes

NO Reduction by Activated Carbons. 5. Catalytic Effect of Iron

María José Illán Gómez、Á. Linares-Solano、Ljubis̆a R. Radović 等 4 位作者1995-05-01Energy & Fuels

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNO Reduction by Activated Carbons. 5. Catalytic Effect of IronM. Jose Illan-Gomez, Angel Linares-Solano, Ljubisa R. Radovic, and Concepcion Salinas-Martinez de LeceaCite this: Energy Fuels 1995, 9, 3, 540–548Publication Date (Print):May 1, 1995Publication History Published o…

Catalytic Processes in Materials ScienceCatalysis and Hydrodesulfurization StudiesNanomaterials for catalytic reactions

Characterization of muconate and chloromuconate cycloisomerase from Rhodococcus erythropolis 1CP: indications for functionally convergent evolution among bacterial cycloisomerases

Inna P. Solyanikova、O. V. Mal’tseva、Martin Vollmer 等 5 位作者1995-05-01Journal of Bacteriology

Muconate cycloisomerase (EC 5.5.1.1) and chloromuconate cycloisomerase (EC 5.5.1.7) were purified from extracts of Rhodococcus erythropolis 1CP cells grown with benzoate or 4-chlorophenol, respectively. Both enzymes discriminated between the two possible directions of 2-chloro-cis, cis-muconate cycloisomerization and…

Pancreatic function and diabetesEnzyme Structure and FunctionBiochemical and Molecular Research

Instrumentation and dosimeter‐size artifacts in quantitative thermoluminescence dosimetry of low‐dose fields

Ali S. Meigooni、Vivek Mishra、Harish Panth 等 4 位作者1995-05-01Medical Physics

Thermoluminescence dosimetry is extensively used for quantitative dose measurements in various irradiation fields such as dosimetry of brachytherapy sources. In this application, small doses on the order of 0.5 cGy must be accurately measured, which requires careful control of instrumentation, energy-dependence, and n…

Luminescence Properties of Advanced MaterialsCatalytic Processes in Materials ScienceRadiation Effects and Dosimetry

Comment on ‘‘Particle-size effects on the value ofTCofMnFe2O4: Evidence for finite-size scaling’’

P. J. van der Zaag、V.A.M. Brabers、M.T. Johnson 等 5 位作者1995-05-01Physical review. B, Condensed matter

We show that a nonequilibrium cation distribution is the likely explanation for the 47-K rise in the Curie temperature of ultrafine ${\mathrm{MnFe}}_{2}$${\mathrm{O}}_{4}$ particles found by Kulkarni et al. This nonequilibrium cation distribution is argued to be caused, in part, by oxidation of ${\mathrm{Mn}}^{2+}$ to…

Multiferroics and related materialsMagnetic Properties and Synthesis of FerritesIron oxide chemistry and applications

The Molten Helix: Effects of Solvation on the .alpha.- to 310-Helical Transition

Mark L. Smythe、Shawn E. Huston、Garland R. Marshall1995-05-01Journal of the American Chemical Society

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Molten Helix: Effects of Solvation on the .alpha.- to 310-Helical TransitionMark L. Smythe, Shawn E. Huston, and Garland R. MarshallCite this: J. Am. Chem. Soc. 1995, 117, 20, 5445–5452Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Publ…

Solidification and crystal growth phenomena

Velocity of Sound and Elastic Properties of Li2O-B2O3 Glasses

Masao Kodama、Toru Matsushita、Seiji Kojima1995-05-01Japanese Journal of Applied Physics

Ultrasonic velocity in glasses denoted by the composition formula x 2 Li 2 O·(1- x 2 ) B 2 O 3 ( x 2 is the mole fraction) is measured over the composition range 0≤ x 2 ≤0.28 at 10 MHz and 298 K by the ultrasonic pulse-echo overlap method. The elastic property of the glasses is analyzed in terms of the three structura…

Glass properties and applicationsPhotonic Crystals and ApplicationsPhase-change materials and chalcogenides

Unusual finite size effects in the Monte Carlo simulation of microphase formation of block copolymer melts

Uwe Micka、Kurt Binder1995-05-01Macromolecular Theory and Simulations

Abstract Extensive Monte Carlo simulations are presented for the Fried‐Binder model of block copolymer melts, where polymer chains are represented as self and mutually avoiding walks on a simple cubic lattice, and monomer units of different kind (A, B) repel each other if they are nearest neighbors (ε AB > 0). Choo…

Theoretical and Computational PhysicsRheology and Fluid Dynamics StudiesBlock Copolymer Self-Assembly

High-pressure laser spectroscopy ofCr3+:Gd3Sc2Ga3O12andCr3+:Gd3Ga5O12

U. Hömmerich、Kevin L. Bray1995-05-01Physical review. B, Condensed matter

We report on the effect of high pressure on the room-temperature emission spectra and lifetimes of ${\mathrm{Cr}}^{3+}$:GSGG (${\mathrm{Gd}}_{3}$${\mathrm{Sc}}_{2}$${\mathrm{Ga}}_{3}$${\mathrm{O}}_{12}$) and ${\mathrm{Cr}}^{3+}$:GGG (${\mathrm{Gd}}_{3}$${\mathrm{Ga}}_{5}$${\mathrm{O}}_{12}$). In both systems we observ…

Luminescence Properties of Advanced MaterialsGlass properties and applicationsSolid State Laser Technologies

Grain Growth of ZnO in ZnO‐Bi 2 O 3 Ceramics with TiO 2 Additions

H. Suzuki、Richard C. Bradt1995-05-01Journal of the American Ceramic Society

Grain growth of ZnO in liquid‐phase‐sintered ZnO‐Bi 2 O 3 ceramics containing systematic additions of TiO 2 to the 0.55 wt% level has been studied for flring in air from 900° to 1400°C. The Bi 2 O 3 melts during flring, and then the TiO 2 dissolves into the Bi 2 O 3 ‐rich liquid. The TiO 2 initially reacts with the Bi…

ZnO doping and propertiesAdvanced ceramic materials synthesisCatalytic Processes in Materials Science

Optimized binary, phase-only, diffractive optical element with subwavelength features for 155 μm

Zhiping Zhou、Timothy J. Drabik1995-05-01Journal of the Optical Society of America A

We report the use of rigorous coupled-wave diffraction analysis in conjunction with the simulated annealing optimization method for performing optimal design of binary-level surface-relief diffractive elements with subwavelength, submicrometer features that exhibit quasi-linear-phase transmittance. An element designed…

Photonic and Optical DevicesPhotonic Crystals and ApplicationsOptical Coatings and Gratings