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  • 1
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of RFe9Si2Cx compounds (R=Ce, Pr, Nd, Sm; x=0.5, 1.0, 1.5) (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 2852-2856 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A systematic investigation of crystallographic and intrinsic magnetic properties of the compounds RFe9Si2Cx (R=Ce, Pr, Nd, Sm; x=0.5, 1.0, 1.5) has been carried out. The lattice parameters a, c and the unit cell volumes increase with increasing C contents, resulting in the increases of Curie temperatures by about 100–150 K between x=0.5 and x=1.5. The saturation magnetization of RFe9Si2Cx (R=Pr, Nd, Sm) at 1.5 K passes through a maximum at x=1.0, and then decreases slightly. Meanwhile, the average iron moment μFe at 1.5 K is 1.57μB for x=1.0 and 1.63μB for x=1.5 in CeFe9Si2Cx compounds. SmFe9Si2Cx compounds have uniaxial anisotropy with the anisotropy fields HA estimated around 132 kOe at 1.5 K and 50 kOe at 300 K (x=1.5), respectively. First-order magnetization processes are observed in the NdFe9Si2Cx compounds and the first-order magnetization processes critical field Hcr is found to increase with x. In addition, the critical temperature for the onset of the first-order magnetization processes transition is around 90 K in the case of x=1.0. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1339211
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  • 2
    Electronic Resource
    Electronic Resource
    LOE 908: A Specific Blocker of Nonselective Cation Channel (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Cardiovascular drug reviews 18 (2000), S. 0 
    Details
    ISSN: 1527-3466
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1527-3466.2000.tb00033.x
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  • 3
    Electronic Resource
    Electronic Resource
    Flexural Creep of an in Situ-Toughened Silicon Carbide (2001)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 84 (2001), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Flexural creep behavior is reported for an in situ-toughened SiC between 1100° and 1500°C in four-point bending. The flexural creep rate of this SiC, sintered with aluminum, boron, and carbon (ABC-SiC), exhibits linear stress dependence, low apparent activation energy, and low incidence of cavitation and dislocation production. Most grain boundaries in this ceramic contain 1–5 nm intergranular films. The creep rate is consistent with a grain-boundary transport mechanism involving diffusion along the grain-boundary film-SiC interfaces. The microstructure and grain boundaries have been examined using transmission electron microscopy to assess possible changes during creep, particularly in relation to the applied stress direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2001.tb00952.x
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  • 4
    Electronic Resource
    Electronic Resource
    Secondary Phases in Hot-Pressed Aluminum-Boron-Carbon–Silicon Carbide (2001)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 84 (2001), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Silicon carbide hot-pressed with aluminum, boron, and carbon as sintering aids (ABC–SiC), was studied by transmission electron microscopy. Both grain-boundary films and inclusions were prevalent in this material. The present study characterized the inclusions located in triple-junctions, grain boundaries, and the interior of the SiC grains, with emphases on phases not scrutinized before. These inclusions were crystalline, in contrast to the amorphous grain-boundary films. Two dominant types of boron-free triple-junction phases containing Al(Si)-O-C-(S) and Al(Si)-O were identified, where sulfur was an unexpected contaminant, and silicon came from SiO2 or from dissolution of SiC. Boron-containing inclusions with a composition Al-O-B-C were frequently observed inside SiC grains. Although the boron-free aluminum-rich phases wet the grain boundaries completely and are, therefore, effective sintering additives, the boron-containing Al(Si)-O-B-C did not wet the grain boundaries. The structure and chemical composition of these boron-containing intragranular inclusions were determined, and their mechanism of formation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2001.tb00746.x
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  • 5
    Electronic Resource
    Electronic Resource
    Decreased Protein Levels of Nicotinic Receptor Subunits in the Hippocampus and Temporal Cortex of Patients with Alzheimer’s Disease (2000)
    Oxford UK : Blackwell Science Ltd
    Journal of neurochemistry 74 (2000), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Deficits of cortical nicotinic acetylcholine receptors (nAChRs) have been observed in Alzheimer’s disease (AD) by receptor binding assays. Little is known about the receptor subunit specificity influenced by AD, and it might be of importance for therapeutic strategies. In the present study, the protein levels of nAChR α3, α4, α7, and β2 subunits were investigated using western blot analysis on postmortem brains of patients with AD and age-matched controls. The results showed that in human postmortem brain samples, bands with molecular masses of 52, 42, and 50 kDa were detected by anti-α4, anti-α7, and anti-β2 antibodies, respectively. When anti-α3 antibody was used, one major band of 49 kDa and two minor bands of 70 and 38 kDa were detected. In AD patients, as compared with age-matched controls, the α4 subunit was reduced significantly by ∼35 and 47% in the hippocampus and temporal cortex, respectively. A significant reduction of 25% in the α3 subunit was also observed in the hippocampus and a 29% reduction in the temporal cortex. For the α7 subunit, the protein level was reduced significantly by 36% in the hippocampus of AD patients, but no significant change was detected in the temporal cortex. In neither the hippocampus nor the temporal cortex was a significant difference observed in the β2 subunit between AD patients and controls. These results reveal brain region-specific changes in the protein levels of the nAChR, α3, α4, and α7 subunits in AD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.2000.0740237.x
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  • 6
    Electronic Resource
    Electronic Resource
    High coercivity in mechanically milled ThMn12-type Nd–Fe–Mo nitrides (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 4022-4024 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Starting from carefully homogenized Nd10Fe90-yMoy (y=12, 10, 7) alloys and by appropriate mechanical milling, the as-milled microstructure consisting of a nanoscale mixture of severely distorted 1:12 phase and substitutional α-Fe-based solid solution was obtained. This kind of as-milled microstructure was thought to have a critical effect on the formation of iron-free nanocrystalline 1:12 phase during subsequent annealing. Upon nitrogenation, the sample of Nd10Fe78Mo12Nx exhibited a record-high coercivity of 13.1 kOe at 293 K. Measurements of initial magnetization curve and a family of demagnetization curves engendered under different maximum applied fields Hm were carried out, and the results revealed the domain-wall pinning at grain boundaries as the coercivity mechanism. A low Mo-content sample of Nd10Fe83Mo7Nx with iHc∼5.8 kOe, Br∼6.8 kG, and (BH)max∼7.0 MG Oe was made by optimizing the preparation conditions. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1322371
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  • 7
    Electronic Resource
    Electronic Resource
    The Economic Effects of Removing Barriers to Trade in Telecommunications (2004)
    Oxford, UK : Blackwell Publishing Ltd
    The @world economy 27 (2004), S. 0 
    Details
    ISSN: 1467-9701
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Law , Economics
    Notes: This paper quantifies the impact on the economies of the world of complete liberalisation of trade in a key services sector, telecommunications, using a global general equilibrium model. Barriers to trade in telecommunications are highest in developing regions and lowest in developed regions. The paper uses new estimates of these barriers for telecommunications. The results indicate that completely liberalising trade in telecommunications would benefit the world as a whole in terms of increased production by 0.1 per cent. Although the distribution of gains among regions is not even, most regions are projected to gain from liberalising trade in telecommunications. In general, the regions with the highest barriers benefit most. The analysis demonstrates that commercial presence of foreign firms via foreign direct investment is an important mode of delivering telecommunications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-9701.2004.00606.x
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  • 8
    Electronic Resource
    Electronic Resource
    Cloning, characterization and expression analysis of a sucrose synthase gene from tropical epiphytic orchid Oncidium Goldiana (2003)
    Oxford, UK : Munksgaard International Publishers
    Physiologia plantarum 118 (2003), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A full-length cDNA encoding sucrose synthase was isolated from the tropical epiphytic orchid Oncidium Goldiana. The cDNA is 2829 bp in length containing an open reading frame of 2447 bp encoding 816 amino acids with a predicted molecular mass of 93.1 kDa. The deduced amino acid sequence of O. Goldiana sucrose synthase (Osus) shares more than 80% identity with those from other monocotyledonous plants. The sucrose synthase gene was demonstrated to encode a functional sucrose synthase protein by expression as recombinant protein in Escherichia coli. The Osus mRNA is present in all the tissues analysed, with the highest levels in strong sinks such as developing inflorescence and root tips. Incubation with sucrose or glucose resulted in a significant increase in the steady-state Osus mRNA levels in root tips and mature leaves in a similar pattern to maize Sus1. Expression of the Osus mRNA in mature leaves was markedly enhanced by anaerobic conditions and elevated CO2. The expression pattern and regulation of the gene suggest that the sucrose synthase plays an important role in the growth and development of the tropical epiphytic orchid O. Goldiana.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1399-3054.2003.00129.x
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  • 9
    Electronic Resource
    Electronic Resource
    Activation of methane by size-selected iron cluster cations, Fen+ (n=2–15): Cluster-CHx (x=0–3) bond energies and reaction mechanisms (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 9747-9763 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The kinetic energy dependences of the reactions of Fen+ (n=2–15) with CD4 are studied in a guided ion beam tandem mass spectrometer over the energy range of 0–10 eV. All reactions exhibit thresholds and two main products, FenD+ and FenCD2+, are formed. These primary products decompose at higher energies to form secondary and higher order products, FenCD+, FenC+, Fen−1D+, Fen−1CD2+, Fen−1CD+, and Fen−1C+. The cross-section magnitudes for the dehydrogenation products, FenCD2+, are observed to vary considerably as a function of cluster size; subsequent dehydrogenation to form FenC+ becomes more facile for larger clusters. Thresholds for the various primary and secondary reactions are analyzed and bond energies for iron cluster cation bonds to C, CD, CD2, and CD3 are determined. As a function of cluster size, these bond energies rapidly reach relatively constant values, which are argued to lie close to bulk phase values. The relative magnitudes in these bond energies are consistent with simple bond order considerations. On the basis of this thermochemistry, we find that there are barriers to the primary dehydrogenation reactions for all the clusters, except n=3 and 4. Evidence that this barrier for n≥5 corresponds to the chemisorption step is discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1413983
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  • 10
    Electronic Resource
    Electronic Resource
    Reactions of Pt+ with H2, D2, and HD: Effect of lanthanide contraction on reactivity and thermochemistry (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 5565-5573 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A guided ion beam tandem mass spectrometer is used to examine the kinetic energy dependence of reactions of the third-row transition metal cation, Pt+, with molecular hydrogen and its isotopologs. A flow tube ion source produces Pt+ ions in its electronic ground state term and primarily in the lowest spin–orbit level. Corresponding state-specific reaction cross sections are obtained. Modeling of the endothermic reaction cross sections yields the 0 K bond dissociation energy of D0(Pt+–H)=2.81±0.05 eV (271±5 kJ/mol). The experimental thermochemistry is consistent with ab initio calculations, performed here and in the literature. Theory also provides the electronic structures of these species and is used to examine the reactive potential energy surfaces. Results from reactions with HD provide insight into the reaction mechanisms and indicate that the late metal ion, Pt+, reacts largely via a direct mechanism. Results for this third-row transition metal system are compared with the first-row and second-row congeners and found to have higher reactivity towards dihydrogen and stronger M+–H bonds. These differences can be attributed to lanthanide contraction and relativistic effects. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1456028
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