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  • 2005-2009  (3)
  • 1985-1989  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Some global properties and invariance of bundle metrics in the Kaluza–Klein scheme (1988)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 29 (1988), S. 2641-2652 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: It is shown that the transition functions that give the global structure of the fiber bundle play an important role in the construction of the metric. The invariance properties of this metric under general gauge transformations are discussed and it is found that the usual requirement of a gauge-invariant metric leads to severe constraints on the gauge fields. To avoid them, it is shown that the metric should instead be covariant with respect to these transformations. Moreover the existence of global actions that are essential in the context of the consistency problem is also discussed. The presence of such actions is studied in both the principal and their associated bundles. In the case of a homogeneous bundle with G/H as the typical fiber, it is shown that a "spliced'' bundle with G×N(H)/H as the structure group has to be used. The unified space is then taken as the bundle space of its associated bundle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528055
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  • 2
    Electronic Resource
    Electronic Resource
    The propagator in the generalized Aharonov–Bohm effect (1988)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 29 (1988), S. 1154-1157 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The nonrelativistic propagator is derived by formulating the generalized Aharonov–Bohm effect, valid for any gauge group in a general multiply connected manifold, as a gauge artifact in the universal covering space. The loop phase factors and the free homotopy propagators arise naturally. An explicit expression for the propagator when there are two solenoids present is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527957
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Nonabelian progressive waves (1985)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 26 (1985), S. 841-844 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: We present two families of nonabelian wave solutions of the Yang–Mills field equations, some of the previous known solutions occur as special cases of our solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.526576
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Analytic solutions of the SU(3) Yang–Mills field equations with external sources (1988)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 29 (1988), S. 220-223 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: For external sources specified in the radial gauge frame, it is demonstrated how the SU(3) Yang–Mills field configuration can be constructed from the SU(2) solutions. This is explicitly illustrated for the type-II solutions that exhibit the bifurcation phenomenon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528177
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  • 5
    Electronic Resource
    Electronic Resource
    A spectrum converter dye for enhancement of blue-green laser efficiency (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 3414-3416 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to enhance the efficiency of a blue-green laser through spectrum conversion of the pumping light, a converter dye BBQ was mixed in the laser dye solutions. The laser was pumped with a plasma radiation source. The increase of laser output over the maximum obtainable from the pure dye operation was better than 80% for the dye mixture of LD490+BBQ or coumarin 503+BBQ. The estimated enhancement calculated by a simple spectrum conversion model agrees well with the experimental results. The enhancement is mainly effected by irradiance in the UV from the pumping source, the fairly good match of the fluorescence band of converter dye with the absorption band of the laser dye, and the lack of the overlap of the fluorescence band of the laser dyes with the triplet–triplet absorption band of the converter dye used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337639
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    A new nuclear magnetic resonance imaging technique for unambiguous unidirectional measurement of flow velocity (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 1256-1262 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new nuclear magnetic resonance (NMR) flow-velocity-imaging method applied to the study of the fluid dynamics is introduced. In the proposed technique, a selection gradient is used for the phase encoding, and since the selection gradient is relatively small compared with the conventional gradient for phase encoding it allows the measurement of high-velocity flow. To obtain the phase-velocity relationship, the Bloch equation is solved numerically and establishes the quantitative phase-velocity relationship of the flow under the slice selection gradient and echo radio frequency pulse. The flow effect compensation in the directions other than the slice selection direction is achieved by applying additional flow coding gradients similar to the conventional flow phase coding. The experimental NMR flow images obtained with the new technique are compared with the velocity measurements made with a laser Doppler velocimeter, and are found to be in close agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337347
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  • 7
    Electronic Resource
    Electronic Resource
    Novel self-aligned W/TiN/TiSi2 contact structure for very shallow junctions and interconnections (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1672-1674 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This letter describes a novel structure for very large scale integrated contact and interconnect technology that involves selective deposition of W on self-aligned TiN/TiSi2. The TiN layer serves to protect reaction between WF6 and TiSi2 and underlying Si during W deposition as well as to promote adhesion of W layer and minimize contact resistance. The selective deposition of W on TiN, very difficult with conventional hydrogen reduction process, is accomplished by employing a recently developed silane reduction process. The structure prevents silicon consumption leading to the encroachment commonly found in tungsten deposited directly on silicon in very shallow junctions. It is demonstrated that such a structure results in low contact resistance and junction leakages and is applicable to subhalf-micron devices. Tungsten with low resistivity of 8–9 μΩ cm can be achieved at room temperature with the resulting drop by a factor of 3–4 at liquid-nitrogen temperature making the structure more attractive for low-temperature application.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101300
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Identification of QTLs for domestication-related and agronomic traits in an Oryza sativa×O. rufipogon BC1F7 population (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 124 (2005), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Asian cultivated rice was domesticated from the wild rice, Oryza rufipogon and throughout the domestication process, a wide range of morphological and physiological changes altered the ancestral form. This study was conducted to identify the genetic basis of changes associated with the domestication process. An recombinant Inbred line (RIL) population consisting of 120 lines was developed from a cross between the Juponica cultivar.‘Hwayeongbyeo’and a presumed wild progenitor. O. rufipogon Griff. Acc.01944. The population was genotyped with 124 simple sequence length repeat (SSR) markers, providing an average interval size of 15 cM, and also evaluated for 20 traits related to domestication and agricultural performance. A total of 63 quantitative trait locus (QTLs) and one locus associated with qualitative variation for pericarp coloration were identified using single point and composite interval analysis. The number of QTLs per trait ranged from one to seven. Phenotypic variation associated with each QTL ranged from 3.7 to 40.4%. with an average of 15.3%. The results indicated that most domestication-related traits clustered in chromosomal blocks, and the positions of many of these clusters were consistent with those reported in previous studies and with skewed segregation ratios in these BC1,F7 RILs. For 13 (20.6%) of the QTLs identified in this study. the O. rufipogan -derived allele contributed a desirable agronomic effect despite the overall undesirable characteristics of the wild phenotype. Favourable alleles from O. rufipogan were detected for panicle length, spikelets per panicle, days to heading and leaf discoloration associated with cold stress. When compared with previous studies involving interspecific crosses, it can be concluded that O. rufipogon is useful as a source of valuable alleles for rice improvement and that many of the introgressed regions contain genes that have a favourable impact on phenotype in different genetic backgrounds and different environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.2005.01092.x
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  • 9
    Electronic Resource
    Electronic Resource
    Interface interaction in two-phase gas-non-Newtonian liquid flow (1987)
    s.l. : American Chemical Society
    Industrial & engineering chemistry research 26 (1987), S. 2522-2528 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie00072a024
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  • 10
    Electronic Resource
    Electronic Resource
    Factitious panniculitis masquerading as pyoderma gangrenosum (2005)
    Oxford, UK : Blackwell Science Ltd
    Clinical and experimental dermatology 30 (2005), S. 0 
    Details
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We report a case of factitious panniculitis masquerading as florid pyoderma gangrenosum in a 35-year-old woman. At presentation, she had tender, ecchymotic plaques over the lower trunk and limbs, and several biopsies showed active lobular panniculitis. However, the extensive ulceration that ensued was clinically persuasive for pyoderma gangrenosum. We elected to treat the inflammatory element symptomatically with a range of topical and systemic medications including clobetasol propionate, tacrolimus 0.1% ointment, prednisolone, dapsone, cyclosporin A and mycophenolate mofetil, none of which effected an improvement. The possibility of a factitious aetiology had been suspected from the outset, and when signs of clinical depression emerged, antidepressant therapy was initiated and the ulcers were encased in fibreglass casts. Within a short period, healing commenced and slowly progressed with scar formation. In retrospect, we consider the diagnosis to have been factitious panniculitis on the basis of strong circumstantial evidence and the disparity between the histological and clinical features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2230.2004.01713.x
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