Pedro M. Tapia、Edward C. Theriot、Sherilyn C. Fritz 等 5 位作者2004-11-01Diatom Research
The taxonomie position of Cyclotella andina Theriot, Carney et Richerson, a tropical freshwater planktonic diatom originally identified from Lake Titicaca, is modified based on morphological characters. The presence of striae arranged in discrete fascicles on the valve- face, coupled with the placing of fiilto- and ri…
Paleontology and Stratigraphy of FossilsDiatoms and Algae ResearchAquatic Invertebrate Ecology and Behavior
H. Litaiem、Mohamed Dammak、L. Ktari 等 5 位作者2004-11-01Phase Transitions
Calorimetry, conductivity, IR and Raman studies of the two ionic-protonic conductors Rb2SeO4·Te(OH)6 (RbSeTe) and Rb1.12(NH4)0.88SO4·Te(OH)6 (RNST) have been recorded and analyzed. These compounds crystallize in the monoclinic system, the space groups being, respectively, P21/c and P21/a for (RbSeTe) and (RNST) with f…
Crystal Structures and PropertiesAdvanced NMR Techniques and ApplicationsSolid-state spectroscopy and crystallography
P. Suriyachi、Suda Kiatkamjornwong、Pattarapan Prasassarakich2004-11-01Rubber Chemistry and Technology
Abstract Graft copolymer of glycidyl methacrylate and styrene onto natural rubber latex was synthesized by emulsion polymerization using cumene hydroperoxide and tetraethylene pentamine as a redox initiator. The effects of initiator and monomer concentration, reaction temperature and time on grafting efficiency and mo…
Polymer Nanocomposites and Propertiesbiodegradable polymer synthesis and propertiesPolymer Nanocomposite Synthesis and Irradiation
W. M. M. Kessels、J. J. H. Gielis、I. M. P. Aarts 等 5 位作者2004-11-01Applied Physics Letters
Optical second harmonic generation (SHG) has been measured for plasma-deposited thin films of hydrogenated amorphous silicon (a-Si:H) at different polarization states for pump photon energies between 1.0 and 1.7eV. Distinct resonance peaks are observed in this energy range and it is shown that the SH signal originates…
Thin-Film Transistor TechnologiesSilicon Nanostructures and PhotoluminescenceSpectroscopy and Quantum Chemical Studies
D.K. Reinhard、T.A. Grotjohn、Michael Becker 等 6 位作者2004-11-01Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena
Thin diamond membranes and free-standing sheets are of interest for a variety of potential applications. This article describes the film nucleation, microwave plasma-assisted chemical-vapor-deposition synthesis, and subsequent processing steps required to make free-standing strong and flexible diamond foils of several…
Metal and Thin Film MechanicsDiamond and Carbon-based Materials ResearchAdvanced Surface Polishing Techniques
Hiroaki Tanaka、Koji Inaka、Shigeru Sugiyama 等 7 位作者2004-11-01Annals of the New York Academy of Sciences
It is expected that a protein depletion zone and an impurity depletion zone are formed around a crystal during protein crystal growth if the diffusion field around the crystal is not disturbed. The growth rate of the crystal may be decreased and the impurity uptake may be suppressed to result in highly ordered crystal…
Enzyme Structure and FunctionCrystallization and Solubility StudiesFreezing and Crystallization Processes
Chun Ho Tsang、Khian‐Hooi Chew、Yoshihiro Ishibashi 等 4 位作者2004-11-01Journal of the Physical Society of Japan
We studied the structure of interfaces in layered ferroclectrics comprising two different ferroelectric materials with first and/or second order transitions. The layered structure is described using the Landau-Ginzburg theory by including a bilinear coupling at the interface between the two neighboring layers. The int…
Ferroelectric and Piezoelectric MaterialsLiquid Crystal Research AdvancementsMaterial Dynamics and Properties
Maddalena Pizzotti、Elisabetta Annoni、Renato Ugo 等 9 位作者2004-11-01Journal of Porphyrins and Phthalocyanines
A multitechnique investigation of the determination of the order of magnitude of the second and third order NLO response of [5-[(4-dimethylaminophenyl)ethynyl]-15-[(4-nitrophenyl)ethynyl]-10,20-diphenylporphyrinato]nickel(II) (1) is reported with the aim to produce self consistent evidence for a significant NLO respon…
Porphyrin and Phthalocyanine ChemistryNonlinear Optical Materials ResearchPhotochemistry and Electron Transfer Studies
Balwant S. Chohan、Steven C. Shoner、Julie A. Kovacs 等 4 位作者2004-11-01Inorganic Chemistry
Oxidations of a trigonal-bipyramidal, high-spin Ni(II) dithiolate complex of a pentadentate, N3S2-donor ligand, N1,N9-bis(imino-2-mercaptopropane)-1,5,9-triazanonane) nickel(II), and the structurally analogous Zn(II) complex, lead to oxidations of the ligand. Oxidation of the Ni(II) complex with I2 produces a novel Ni…
Metal complexes synthesis and propertiesMagnetism in coordination complexesMetal-Catalyzed Oxygenation Mechanisms
L. B.、Ailing Ji、C. Liu 等 5 位作者2004-11-01Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena
We report a low temperature procedure for the fabrication of highly luminescent silicon nanoparticles in silicon-rich oxide films. A number density over 1012∕cm2 has been achieved for silicon particles of about 3nm in size by plasma-enhanced chemical vapor deposition at a substrate temperature of 30°C. Such deposits,…
Thin-Film Transistor TechnologiesSilicon Nanostructures and PhotoluminescenceNanowire Synthesis and Applications
Anatoly I. Dragan、Sergey A. Potekhin、Andrei Sivolob 等 5 位作者2004-11-01Biochemistry
Temperature-induced reversible unfolding and refolding of the three-stranded alpha-helical coiled coil, Lpp-56, were studied by kinetic and thermodynamic methods, using CD spectroscopy, dynamic light scattering, and scanning calorimetry. It was found that both unfolding and refolding reactions of this protein in neutr…
Protein Structure and DynamicsEnzyme Structure and FunctionSupramolecular Self-Assembly in Materials
Valery I. Levitas、Javad Hashemi、Yanzhang Ma2004-11-01Europhysics Letters (EPL)
One of the challenges in characterization of strain-induced transformations is to create uniform pressure. In this letter, conditions for nearly homogeneous pressure distribution are predicted and achieved experimentally. Compared to hydrostatic loading, plastic shear generally reduces the transformation pressure sign…
High-pressure geophysics and materialsDiamond and Carbon-based Materials ResearchBoron and Carbon Nanomaterials Research
Syeda Huma H. Zaidi、Kannan Muthukumaran、Shun‐ichi Tamaru 等 4 位作者2004-11-01The Journal of Organic Chemistry
1,9-Diacyldipyrromethanes are important precursors to porphyrins, yet synthetic access remains limited owing to (1) poor conversion in the 9-acylation of 1-acyldipyrromethanes and (2) handling difficulties because acyldipyrromethanes typically streak upon chromatography and give amorphous powders upon attempted crysta…
Porphyrin and Phthalocyanine ChemistryPhotodynamic Therapy Research StudiesLuminescence and Fluorescent Materials
E. Somma、Maria Rossella Nobile2004-11-01Journal of Rheology
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Elvira Somma, Maria Rossella Nobile; The linear viscoelastic behavior of a series of molecular we…
Liquid Crystal Research AdvancementsPolymer crystallization and propertiesPolymer Nanocomposites and Properties
E. Nes、Knut Marthinsen、Bjørn Holmedal2004-11-01Materials Science and Technology
The subgrain size and the spacing of high angle boundaries are important parameters used to describe the microstructure in metals deformed to large strains. How the flow stress depends on the boundary spacing is discussed here and it is argued that the best way this is treated is in the work hardening model developed…
Microstructure and mechanical propertiesMicrostructure and Mechanical Properties of SteelsMetallurgy and Material Forming
Thomas A. Godfrey、J. N. Rossettos、S. E. Bosselman2004-11-01Journal of Applied Mechanics
A simple micromechanical model is presented for predicting the onset of tearing at slitlike damage sites in biaxially stressed coated plain weave fabrics. The stress concentration in the first intact yarn at the slit tip is determined as a function of increasing loading, and predictions for the onset of tearing are ma…
Mechanical Behavior of CompositesTextile materials and evaluationsStructural Analysis and Optimization
J. Wang、Giti A. Khodaparast、Junichiro Kono 等 5 位作者2004-11-01Journal of Modern Optics
We use ultrafast optical techniques to investigate the dynamics of charge and spin carriers and coherent phonons as well as magnetic order in III-V ferromagnetic semiconductors. We observe a rich array of dynamical phenomena that are absent in traditional nonmagnetic semiconductors or metallic ferromagnets. Very short…
Semiconductor Quantum Structures and DevicesZnO doping and propertiesQuantum and electron transport phenomena
Vladimir A. Fonoberov、Alexander A. Balandin2004-11-01Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics
We derive analytically the interface and confined polar optical-phonon modes for spherical quantum dots with wurtzite crystal structure. While the frequency of confined optical phonons in zincblende nanocrystals is equal to that of the bulk crystal phonons, the confined polar optical phonons in wurtzite nanocrystals a…
ZnO doping and propertiesQuantum Dots Synthesis And PropertiesSilicon Nanostructures and Photoluminescence
Héctor Beltrán‐Mir、Eloísa Cordoncillo、Purificación Escribano 等 5 位作者2004-11-01Journal of the American Ceramic Society
Samples of composition Ba 1− x La x Ti 1− x /4 O 3 , x = 0, 0.003, 0.03, and 0.10, were prepared by an alkoxide sol–gel route with final firing of ceramics at 1100°C, 2 h in air. All samples showed bulk insulating behavior with no evidence of semiconductivity caused by either direct donor doping or oxygen loss.
Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsMicrowave Dielectric Ceramics Synthesis
T. Narasimhaswamy、K. S. V. Srinivasan2004-11-01Liquid Crystals
Novel thermotropic liquid crystals containing a terminal dimethylamino group were synthesized via a multi-step route. Three phenyl ring units linked with ester and azomethine groups constituted the mesogenic core. All the compounds were characterized by spectroscopic techniques, polarizing microscopy and differential…
Liquid Crystal Research AdvancementsPhotochemistry and Electron Transfer StudiesMolecular spectroscopy and chirality