Francisco M. Romero、Raymond Ziessel、Michel Bonnet 等 9 位作者2000-02-01Journal of the American Chemical Society
A correlation between the magnetic properties and the crystal structure of the nitronyl nitroxide (NN) radical 2-(6-ethynyl-2-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (6-HC⋮CPyNN, 1 ) and its imino nitroxide analogue 2-(6-ethynyl-2-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl (6-HC⋮CPyIN, 2 ) has been…
Magnetism in coordination complexesMetal-Catalyzed Oxygenation MechanismsElectron Spin Resonance Studies
Gaetano Guerra、Giuseppe Milano、Vincenzo Venditto 等 6 位作者2000-02-01Chemistry of Materials
An inexpensive and reusable thermoplastic material that is promising in the field of chemical separations, and in particular of water and air purification from volatile organic compounds, is presented. This semicrystalline material based on syndiotactic polystyrene comprises a nanoporous crystalline phase where guest…
Mesoporous Materials and CatalysisMembrane Separation and Gas TransportCovalent Organic Framework Applications
Guoguang Lu2000-02-01Journal of Applied Crystallography
In order to facilitate the three-dimensional structure comparison of proteins, software for making comparisons and searching for similarities to protein structures in databases has been developed. The program identifies the residues that share similar positions of both main-chain and side-chain atoms between two prote…
Protein Structure and DynamicsMicrobial Metabolic Engineering and BioproductionEnzyme Structure and Function
Katsuaki Ono、Yoshio Saitō、Hirohumi Yura 等 7 位作者2000-02-01Journal of Biomedical Materials Research
A photocrosslinkable chitosan to which both azide and lactose moieties were introduced (Az-CH-LA) was prepared as a biological adhesive for soft tissues and its effectiveness was compared with that of fibrin glue. Introduction of the lactose moieties resulted in a much more water-soluble chitosan at neutral pH. Applic…
Electrospun Nanofibers in Biomedical ApplicationsPolymer Surface Interaction StudiesSurgical Sutures and Adhesives
Isabel Quijada‐Garrido、Miguel Fernández de Velasco-Ruiz、José Manuel Barrales‐Rienda2000-02-01Macromolecular Chemistry and Physics
Diffusion of erucamide (13-cis-docosenamide) [H3C— (—CH2—)11—HC=CH—(—CH2—)7—CO— NH2] (eru) in poly(laurolactam) (Nylon 12) (PA-12) has been studied in a temperature range from 343 to 353 K. In previous investigations on the diffusion of eru in isotactic poly(propylene) (i-PP) it was found that the diffusion took place…
Polymer crystallization and propertiesbiodegradable polymer synthesis and propertiesMembrane Separation and Gas Transport
Virginie Hornebecq、Catherine Elissalde、J.M. Réau 等 4 位作者2000-02-01Ferroelectrics
Ceramics belonging to the Pb5xK6(1−x)Li4(1−x)Ta10O30 solid solution were prepared and characterized by dielectric and a. c. impedance complex measurements. Two types of relaxations were observed: a relaxor behavior and an impedance relaxation. Characteristics of these two relaxations were studied and explained for a p…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesMicrowave Dielectric Ceramics Synthesis
C.N. Fredd、M.J. Miller2000-02-01OpenAlex
The successful matrix stimulation of carbonate reservoirs requires that live acid penetrate past the formation damage. Effective acid penetration is facilitated either by transport through natural fractures or the formation of dissolution channels (wormholes) during the acidizing process. The optimal formation of worm…
Hydrocarbon exploration and reservoir analysisCalcium Carbonate Crystallization and InhibitionCO2 Sequestration and Geologic Interactions
Valérie Vermylen、Philippe Lodéfier、Jacques Devaux 等 7 位作者2000-02-01Journal of Polymer Science Part A Polymer Chemistry
A low percentage of cyclic oligomers can be found in poly(ethylene terephthalate) (PET) from its synthesis onward. In this article, a cyclic-oligomer-free PET (COFP) obtained by solvent extraction was used to study the thermodynamics of the re-formation of cyclics from the melt. The cyclic-oligomer content re-increase…
Polymer crystallization and propertiesFiber-reinforced polymer compositesRecycling and Waste Management Techniques
Ben Niu、Takahisa Yoshimura、Akio Hirai2000-02-01Clays and Clay Minerals
Abstract Illitization of smectite during progressive burial diagenesis occurs differently in sandstone and mudstone, which are interbedded in the sedimentary sequence of the Niigata basin. Reaction progress of illitization of smectite via mixed-layer illite-smectite (I-S) in the mudstone is more complete than in the s…
Paleontology and Stratigraphy of FossilsClay minerals and soil interactionsIron oxide chemistry and applications
Dominique Housset、Farid Benabicha、V. Pichon-Pesme 等 8 位作者2000-02-01Acta Crystallographica Section D Biological Crystallography
The number of protein structures refined at a resolution higher than 1.0 A is continuously increasing. Subatomic structures may deserve a more sophisticated model than the spherical atomic electron density. In very high resolution structural studies (d < 0.5 A) of small peptides, a multipolar atom model is used to des…
Protein Structure and DynamicsMass Spectrometry Techniques and ApplicationsEnzyme Structure and Function
M. Graca H. Vicente、Kevin M. Smith2000-02-01Current Organic Chemistry
Porphyrins, usually as metal complexes of either iron or magnesium, are widely distributed in nature, and exist as the prosthetic groups in a wide variety of primary metabolites such as hemoglobins, myoglobins, cytochromes, catalases, peroxidases, chlorophylls, and bacteriochlorophylls. This article describes the curr…
Porphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation MechanismsPorphyrin Metabolism and Disorders
M. Nespolo、Atsuyasu Sato、Takeo Osawa 等 4 位作者2000-02-01Crystal Research and Technology
Synthesis of InGaZnO4 at 20Kb and 50Kb produced a single crystal and a twinned crystal respectively. The X�ray diffraction crystal structure refinement (R1 = 0.015 and 0.019 respectively) and the Charge Distribution analysis are reported. Space group is R3m; cell parameters in hexagonal axes are a = 3.2990(2)Å, c = 26…
ZnO doping and propertiesGas Sensing Nanomaterials and SensorsGa2O3 and related materials
Hamid Eskandari‐Naddaf、J.A. Nemes2000-02-01Journal of Composite Materials
A tensile version of the split Hopkinson bar, suitable for dynamic testing of laminated composite materials, is introduced. A pulse duration of 200-250 microseconds and peak strain rates of up to 350 s5l are obtained. Tests performed on a quasi-isotropic lay-up of graphite-epoxy show good repeatability. To determine t…
Energetic Materials and CombustionHigh-Velocity Impact and Material BehaviorElectromagnetic Launch and Propulsion Technology
N.K. Naik、Vijay Madhavan2000-02-01The Journal of Strain Analysis for Engineering Design
Twisted yarns are normally used for increasing the lateral cohesion of filaments and also for ease of handling. By twisting yarns, the microdamage can be localized, leading to possible increase in the failure strength of the yarns. In this paper, an analytical method is presented for predicting the elastic properties…
Mechanical Behavior of CompositesTextile materials and evaluationsStructural Analysis and Optimization
C. Benecke、Hubert Seiberle、Martin Schadt2000-02-01Japanese Journal of Applied Physics
We report on how to achieve and measure director tilt angle distributions θ( z ) in cross-linked nematic liquid crystal polymer (LCP) films by means of generalized anisotropic ellipsometry. LCP-alignment is made by linearly photopolymerized (LPP)-photo-alignment of LCP films on single substrates. For the first time ar…
Photonic and Optical DevicesLiquid Crystal Research AdvancementsOptical Polarization and Ellipsometry
Corinne Binet、Michel Mitov、Alain M. Böudet2000-02-01Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals
Due to the existence of a macroscopic helicoidal structure, cholesteric liquid crystals exhibit many remarkable properties like selective light reflections. Bragg reflections occur when the helix pitch is of the order of the wavelength of the incident light propagating along the helix axis. The wavelength bandwidth is…
Liquid Crystal Research AdvancementsPhotonic Crystals and ApplicationsPhase-change materials and chalcogenides
S. Vaidyanathan、V. Moorthy、T. Jayakumar 等 4 位作者2000-02-01Materials Science and Technology
The influence on the hysteresis loop and the magnetic Barkhausen emission (MBE) of microstructure within the case of different induction hardened carbon steel shafts has been studied. The hysteresis loop shows a distortion with a sudden reduction in the rate of magnetisation (dB/dH ) before approaching the maximum mag…
Microstructure and Mechanical Properties of SteelsMagnetic Properties and ApplicationsInduction Heating and Inverter Technology
Judit E. Puskás、LB Brister、Armin Michel 等 6 位作者2000-02-01Journal of Polymer Science Part A Polymer Chemistry
This article presents the first detailed account of the discovery that substituted epoxides can initiate the carbocationic polymerization of isobutylene. α-Methylstyrene epoxide (MSE), 2,4,4-trimethyl-pentyl-epoxide-1,2 (TMPO-1), 2,4,4-trimethyl-pentyl-epoxide-2,3 (TMPO-2), and hexaepoxi squalene (HES) initiated isobu…
Advanced Polymer Synthesis and Characterizationbiodegradable polymer synthesis and propertiesCarbon dioxide utilization in catalysis
Naohiko Yasuda、Hidehiro Ohwa、Motoyuki Kume 等 4 位作者2000-02-01Japanese Journal of Applied Physics
High-quality piezoelectric (1- x )Pb(In 1/2 Nb 1/2 )O 3 – x PbTiO 3 binary system single crystals near a morphotropic phase boundary were successfully grown by a conventional flux method using PbO–PbF 2 –B 2 O 3 flux. The largest crystal had dimensions of about 20 mm×10 mm×5 mm. The permittivity shows a shoulder at th…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesMicrowave Dielectric Ceramics Synthesis
Yann Garcia、Petra J. van Koningsbruggen、H. Kooijman 等 6 位作者2000-02-01European Journal of Inorganic Chemistry
A novel three-dimensional copper(II) compound of the formula [Cu3(btre)5(H2O)2](ClO4)6·H2O (btre = 1,2-bis(1,2,4-triazol-4-yl)ethane) has been synthesized. The structure has been solved at 150 K by single-crystal X-ray analysis. The compound [C30H44Cu3N30O2·6(ClO4)·H2O] crystallizes in the triclinic space group P1bar…
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes