J. Gjønnes、Vidar Hansen、B. S. Berg 等 8 位作者1998-05-01Acta Crystallographica Section A Foundations of Crystallography
Three-dimensional electron diffraction intensity data have been collected for the metastable alloy phase AlmFe by a precession technique. The structure model has been derived by Patterson and Fourier calculations and by the direct method using either maximum entropy and likelihood or the tangent formula; both were bas…
Aluminum Alloy Microstructure PropertiesElectron and X-Ray Spectroscopy TechniquesX-ray Diffraction in Crystallography
Oren Bogin、Moshe Peretz、Yael Hacham 等 7 位作者1998-05-01Protein Science
A comparison of the three-dimensional structures of the closely related mesophilic Clostridium beijerinckii alcohol dehydrogenase (CBADH) and the hyperthermophilic Thermoanaerobacter brockii alcohol dehydrogenase (TBADH) suggested that extra proline residues in TBADH located in strategically important positions might…
Protein Structure and DynamicsEnzyme Structure and FunctionBiochemical and Molecular Research
R. F. A. Jargelius‐Pettersson、Bruce G. Pound1998-05-01Journal of The Electrochemical Society
The role of Mo in the passivation of stainless steels was investigated using ac impedance spectroscopy. Six steels were examined: two ferritic (Fe‐20Cr) alloys containing 0 and 1% Mo and four austenitic (Fe‐20Cr‐25Ni) alloys containing 0, 1, 2, and 4.5% Mo. The experiments were performed in 1 M HCl and, in some cases,…
Corrosion Behavior and InhibitionHydrogen embrittlement and corrosion behaviors in metalsElectrodeposition and Electroless Coatings
Maher A. Alodan、William H. Smyrl1998-05-01Journal of The Electrochemical Society
Confocal laser scanning microscopy was used in an in situ fluorescence mode to investigate localized corrosion of aluminum alloys in the presence of 0.1 M KCl. Fluorescein dye was used to indicate pH changes and surface chemistry over and around the active sites. Al 6061 was found to have at least two kinds of inclusi…
Corrosion Behavior and InhibitionElectron and X-Ray Spectroscopy TechniquesAnodic Oxide Films and Nanostructures
P. Hansen、Detlev Hennings、Herbert Schreinemacher1998-05-01Journal of the American Ceramic Society
(Ba 1− x Ca x )(Ti 1− y Zr y )O 3 ceramics doped with various donors and acceptors were sintered in a reducing atmosphere and then annealed at different oxygen partial pressures. The dielectric maxima at the Curie point increased up to ∼30000 after reoxidation, depending on the grain size, the type of acceptor, and th…
Ferroelectric and Piezoelectric MaterialsMicrowave Dielectric Ceramics SynthesisDielectric properties of ceramics
Andrea Carfı́、E. Duée、Moreno Galleni 等 5 位作者1998-05-01Acta Crystallographica Section D Biological Crystallography
Class B beta-lactamases are wide spectrum enzymes which require bivalent metal ions for activity. The structure of the class B zinc-ion-dependent beta-lactamase from Bacillus cereus (BCII) has been refined at 1.85 A resolution using data collected on cryocooled crystals (100 K). The enzyme from B. cereus has a molecul…
Protein Structure and DynamicsAntibiotic Resistance in BacteriaEnzyme Structure and Function
You‐Lo Hsieh、Lisa A. Cram1998-05-01Textile Research Journal
The ability of six hydrolyzing enzymes to improve the hydrophilicity of several polyester fabrics is studied. Five of the six lipases improve the water wetting and absorbent properties of regular polyester fabrics more than alkaline hydrolysis under optimal conditions (3 N NaOH at 55°C for 2 hours). Compared to aqueou…
Microplastics and Plastic PollutionDyeing and Modifying Textile FibersTextile materials and evaluations
Mingjie Zhang、Guan‐Long Huang1998-05-01Biochemistry and Cell Biology
Calmodulin (CaM) is a primary Ca 2+ -binding protein found in all eukaryotic cells. It couples the intracellular Ca 2+ signal to many essential cellular events by binding and regulating the activities of more than 40 different proteins and enzymes in a Ca 2+ -dependent manner. CaM contains two structurally similar dom…
Protein Structure and DynamicsEnzyme Structure and FunctionNitrogen and Sulfur Effects on Brassica
Seong‐Hyeon Hong、Gary L. Messing1998-05-01Journal of the American Ceramic Society
Densification and anisotropic grain growth in diphasic‐gel‐derived, titania‐doped mullite were studied. Titania enhanced initial and intermediate stage densification in diphasic mullite gels by reducing the glass viscosity. Rodlike anisotropic mullite grains started to grow in titania‐doped diphasic mullite gels once…
Advanced ceramic materials synthesisIntermetallics and Advanced Alloy PropertiesAdvanced materials and composites
Junya Kondoh、Tsuyoshi Kawashima、Shiomi Kikuchi 等 5 位作者1998-05-01Journal of The Electrochemical Society
The causes of the decrease in electrical conductivity with aging in Y 2 O 3 ‐stabilized zirconia, an oxygen‐ion conductor, were studied. This study was carried out using the dc four‐probe technique for measuring electrical conductivity and the activation energy for the migration of oxygen ions. The results show that c…
Advancements in Solid Oxide Fuel CellsFuel Cells and Related MaterialsMetal Extraction and Bioleaching
Jae‐Hoon Kim、Satyendra Kumar、Sin‐Doo Lee1998-05-01Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
The influence of unpolarized and linearly polarized UV exposure on previously rubbed as well untreated thin polyimide (PI) alignment layers was studied. Optical retardation and surface morphology measurements were carried out to understand the nature of surface modification as a function of the polarization and the ex…
Liquid Crystal Research AdvancementsForce Microscopy Techniques and ApplicationsAdvanced Materials and Mechanics
A.A. Adly、Salwa K. Abd–El–Hafiz1998-05-01IEEE Transactions on Magnetics
The identification process of the classical Preisach-type hysteresis model reduces to the determination of the weight function of elementary hysteresis operators upon which the model is built. It is well known that the classical Preisach model can exactly represent hysteretic nonlinearities which exhibit wiping-out an…
Microstructure and Mechanical Properties of SteelsShape Memory Alloy TransformationsMagnetic Properties and Applications
T. Uchida、Kozo Kozawa、Tetsuya Sakai 等 7 位作者1998-05-01Molecular 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
Of 140 newly synthesized chalcone-analogous materials, 56 specimens were observed to be efficient for nonlinear optical second harmonic generation (SHG). The SHG efficiency of 3-(4-chlorophenyl)-1-(3-pyridyl)-2-propen-1-one is discussed on the basis of crystal structure and MO calculation. In this crystal, molecules a…
Synthesis and biological activityNonlinear Optical Materials ResearchPhotochemistry and Electron Transfer Studies
D. W. McCarthy、J. E. Mark、Dale W. Schaefer1998-05-01Journal of Polymer Science Part B Polymer Physics
Various synthetic protocols were used to prepare several classes of polysiloxane–silica filler systems. The structures of these fillers and their interactions with the polysiloxane matrices were studied using small-angle X-ray and neutron scattering. In addition, the mechanical properties of the composites were charac…
Polymer Nanocomposites and PropertiesSynthetic Organic Chemistry MethodsSilicone and Siloxane Chemistry
C. Serpico、C. Visone1998-05-01IEEE Transactions on Magnetics
A general neural approach to magnetic hysteresis modeling is proposed. The general memory storage properties of systems with rate independent hysteresis are outlined. Thus, it is shown how it is possible to build a neural hysteresis model based on feed-forward neural networks (NN's) which fulfills these properties. Th…
Neural Networks and ApplicationsForce Microscopy Techniques and ApplicationsMagnetic Properties and Applications
David J. Gosztola、Mark P. Niemczyk、Michael R. Wasielewski1998-05-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPicosecond Molecular Switch Based on Bidirectional Inhibition of Photoinduced Electron Transfer Using Photogenerated Electric FieldsDavid Gosztola, Mark P. Niemczyk, and Michael R. WasielewskiView Author Information Chemistry Division, Argonne National Laboratory Argon…
Porphyrin and Phthalocyanine ChemistryMolecular Junctions and NanostructuresPhotochemistry and Electron Transfer Studies
Takashi Kato、Takaaki Kutsuna、Kenji Hanabusa 等 4 位作者1998-05-01Advanced Materials
The formation of an anisotropic gel—a member of a new class of gel—is described. A structure is proposed for the liquid-crystalline gel (see also the cover of this issue), which was formed by the gelation of a room-temperature nematic liquid crystal, achieved by the self-aggregation of low-molecular-weight molecules t…
Liquid Crystal Research Advancements
Zexiang Shen、X. B. Wang、M. H. Kuok 等 4 位作者1998-05-01Journal of Raman Spectroscopy
The antiferroelectric to ferroelectric phase transition in NaNbO3 was investigated by Raman scattering between 295 and 10 K. The transition occurs at 185 K on cooling and the antiferroelectric and ferroelectric phases coexist at low temperature. The transition occurs at 210 K on heating and the relatively large hyster…
Ferroelectric and Piezoelectric MaterialsPhotorefractive and Nonlinear OpticsSolid-state spectroscopy and crystallography
Laurent M. Matuana、John J. Balatinecz、Chul B. Park1998-05-01Polymer Engineering and Science
Abstract The interface between plastic and wood fibers strongly influences the mechanical properties of a plastic/wood‐fiber composite. This paper presents a means for evaluating the effectiveness of surface treatment on the wood‐fibers in the PVC/wood‐fiber composites by investigating the adhesion between PVC and lam…
Mechanical Behavior of CompositesSurface Modification and SuperhydrophobicityPolymer crystallization and properties
David L. Brundrett、Elias N. Glytsis、Thomas K. Gaylord1998-05-01Optics Letters
Guided-mode resonant grating filters have numerous applications. However, in weakly modulated gratings designed for use at normal incidence, the filtering resonance of these subwavelength-period devices splits for angles of incidence that are even slightly off normal incidence. Strongly modulated gratings are designed…
Photonic and Optical DevicesPhotonic Crystals and ApplicationsOptical Coatings and Gratings