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  • 1
    Electronic Resource
    Electronic Resource
    Design trade-offs in optoelectronic parallel processing systems using smart-SLMs (1992)
    Springer
    Optical and quantum electronics 24 (1992), S. S379 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Optoelectronic devices with free-space optical interconnections offer new possibilities in massively parallel processing. The trade-offs involved in system design and device selection for optoelectronic implementations are examined. System design trade-offs are approached from algorithmic and technological standpoints. From the algorithmic standpoint, new architectures based on expander graphs, that have been shown to provide low-contention fault-tolerant communication, are discussed. Optoelectronic systems which implement such random graphs can be folded to reduce the hardware cost or unfolded to increase bandwidth. They can also be partially folded by increasing the grain size or by reducing the randomness of the graph topology to reduce the complexity of the interconnection holograms. An optoelectronic and a VLSI implementation of a multistage interconnection network are compared from a technological standpoint. Physical design parameters, such as the chip size or the number of phase levels of the interconnection holograms, are related to the system design metrics such as bandwidth, volume, area and power. It is shown that the optoelectronic implementations have higher performance and are more cost-effective than VLSI implementations. These results are also used to provide general guidelines for device selection in the design of smart pixels/smart spatial light modulators based optoelectronic systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619508
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  • 2
    Electronic Resource
    Electronic Resource
    New self-align method for fabrication of 980 nm ridge waveguide laser diodes (1995)
    Springer
    Optical and quantum electronics 27 (1995), S. 447-451 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A novel self-align method has been developed for the fabrication of 980 nm ridge waveguide laser diodes. It utilizes the facts that (1) the thickness of photoresist on the ridge top is substantially less than that in its vicinity and (2) their respective exposure times differ accordingly. Except for replacing the second photolithographic step with a simple flood-exposure, the fabrication procedure is identical to that for conventional ridge waveguide laser diodes. No additional materials or processing steps are required. As a result, the laser fabrication is significantly simplified with excellent reproducibility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00563582
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  • 3
    Electronic Resource
    Electronic Resource
    The conversion of methane to ethylene and ethane with near total selectivity by low temperature (〈 610 ° C) oxydehydrogenation over a calcium-nickel-potassium oxide catalyst (1990)
    Springer
    Catalysis letters 6 (1990), S. 255-262 
    Details
    ISSN: 1572-879X
    Keywords: Total selectivity in methane conversion ; calcium-nickel-potassium oxide catalyst ; methane conversion to ethylene and ethane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The catalytic oxidative coupling of methane to C2, C3 and C4 paraffins and olefins has been accomplished with close to 100% selectivity at methane conversions of about 10% per pass. Essentially no carbon oxides are formed and the mechanism appears to be a surface catalyzed reaction. Temperatures of 〈 600 ° C are used and the presence of steam is important. The catalyst comprises a ternary mixture of calcium, nickel and potassium oxides. Method of preparation and composition of the catalyst are critical for its performance. Presence of a carbidic carbon on the catalyst surface may be important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00763991
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  • 4
    Electronic Resource
    Electronic Resource
    Direct mapping of insertion reaction dynamics: S(1D)+H2→SH+H (2000)
    Springer
    Applied physics 71 (2000), S. 627-633 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 30; 40; 80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The Doppler-selected time-of-flight method was applied to map out the differential cross sections of the title reaction at two collision energies in a crossed-beam experiment. Roughly symmetric and highly forward–backward peaking angular distributions were observed at both energies. Vibrational structures of the SH product were resolved from the velocity measurements of the counter-product H-atom. Most of the angle-integrated observables can readily be understood on statistical grounds, which suggests that statistics plays the dominant role in determining the outcomes of this prototypical insertion reaction. In terms of more detailed angle-specific reaction attributes, significant discrepancies from statistical considerations were revealed, indicative of some hidden dynamics being buried under the statistical factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400000386
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  • 5
    Electronic Resource
    Electronic Resource
    A coherent optical feedback system for optical information processing (1975)
    Springer
    Applied physics 8 (1975), S. 51-58 
    Details
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A unique optical feedback system for coherent optical data processing is described. With the introduction of feedback, the well-known transfer function for feedback systems is obtained in two dimensions. Operational details of the optical feedback system are given. Experimental results of system applications in image restoration, contrast control and analog computation are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00883670
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  • 6
    Electronic Resource
    Electronic Resource
    Accumulation of Tributyl- and Triphenyltin Compounds in Pacific Oyster, Crassostrea gigas, from the Chinhae Bay System, Korea (1998)
    Springer
    Archives of environmental contamination and toxicology 35 (1998), S. 41-47 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract. Butyl- and phenyltin residues were quantified in seawater and Pacific oyster (Crassostrea gigas) from the Chinhae Bay System, Korea. Butyltin compounds were detected in all the seawater and C. gigas samples, whereas phenyltin compounds were not detected in any seawater samples. Tributyltin (TBT) concentrations in seawater ranged 〈8–35 ng Sn L−1. TBT and triphenyltin (TPhT) concentrations in oysters ranged 95–885 and 155–678 ng Sn g−1, respectively. Spatial distribution of TBT was closely related to boating and dry-docking activities. However, spatial distribution of TPhT was not consistent with that of TBT. The estimated biological concentration factor (BCF) for TBT in C. gigas was about 25,000. Furthermore, 19 and 28% of total body burdens of TBT and TPhT were found in gonadal mass of C. gigas just prior to the spawning period, indicating that a proportional amount of TBT and TPhT would be released with a following reproductive process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002449900346
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  • 7
    Electronic Resource
    Electronic Resource
    Gradual downslope change in high-resolution acoustic characters and geometry of large-scale submarine debris lobes in Ulleung Basin, East Sea (Sea of Japan), Korea (1999)
    Springer
    Geo-marine letters 19 (1999), S. 254-261 
    Details
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A detailed analysis of high-resolution seismic data (Chirp, 2–7 kHz) in the Ulleung Basin reveals spatial variation in echo characteristics and geometry of large-scale debris lobes. In the proximal part, the debris lobes are dominated by hummocky surface echoes and gradually transitional downslope to seafloor-tangent hyperbolic and smooth prolonged bottom echoes, reflecting progressive decrease in size, spacing, and relief of surface forms. The strongly convex-upward upper surface with steep blunt margins in the proximal part is gradually transitional downslope to slightly convex- upward or nearly flat form with less blunt margins. The gradual downslope decrease in both scale and spacing of surface forms and convexity of upper surface within each debris lobe is suggestive of progressive dilution in flow concentration within a debris flow, probably due to mixing of ambient water and removal of suspended sediment by deposition during downslope movement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003670050116
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  • 8
    Electronic Resource
    Electronic Resource
    Uterine epithelial and eosinophil estrogen receptors in rats during the estrous cycle (1982)
    Springer
    Histochemistry and cell biology 74 (1982), S. 443-452 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the uterus of the adult female rats, the luminal epithelial cells and the eosinophil leukocytes are rich in cytoplasmic estrogen receptors. During the estrous cycle, the epithelial estrogen receptor concentration reaches its peak level, in proestrus, drops precipitously in estrus, and hits the trough, at metestrus. Repopulation of the cytoplasm with estrogen binding sites occurs during diestrus. This pattern of cyclic change is indicative of a rapid turnover of estrogen receptors in the epithelial cells and its regulation by endogenous estrogens. The concentration of estrogen receptors in the cytoplasm of the eosinophils does not appear to fluctuate during the cycle. But the intrauterine, distribution of these leukocytes is clearly cyclic in pattern, ostensibly influenced by estrogens. While progesterone binding activity is consistently demonstrated in tandem with estrogen receptors in the cytoplasm of the epithelial cells, it has not been observed in the eosinophil leukocytes. These findings support the claim that there are two estrogen receptor systems in the rat uterus, one mediating the intracellular events of the genomic response to estrogens, and the other being concerned with non-genomic responses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00496657
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  • 9
    Electronic Resource
    Electronic Resource
    Aldehyde as fixative for histochemical study of glutamic oxaloacetic transaminase (1968)
    Springer
    Histochemistry and cell biology 12 (1968), S. 341-344 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Several compounds of the aldehyde group have been tested as fixatives for histochemical localization of GOT activity in the rat kidney. A brief fixation of cryostat tissue sections in 1% glutaraldehyde results in well localized enzymatic activity which is not greatly further affected by an additional treatment in 4% formaldehyde.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00278306
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  • 10
    Electronic Resource
    Electronic Resource
    An improved procedure for plant regeneration from indica and japonica rice protoplasts (1995)
    Springer
    Plant cell reports 14 (1995), S. 515-519 
    Details
    ISSN: 1432-203X
    Keywords: Oryza sativa L. ; indica ; japonica ; protoplast culture ; feeder cells ; plant regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plant regeneration from protoplasts of two commercially cultivated Indian indica rice varieties, Pusa Basmati 1 and Java, has been accomplished by plating embryogenic cell suspension-derived protoplasts on the surface of filter membranes overlying agarose-embedded feeder cells of Lolium multltiflorum and Oryza ridleyi, combined with the use of a maltose-containing shoot regeneration medium. Embryogenic cell suspension cultures of Pusa Basmati 1 and Jaya were initiated from mature seed scutellum-derived calli in liquid R2 medium modified by the addition of 560 mg l−1 of proline and 1.0 % (w/v) maltose. In both varieties, protoplast plating efficiencies up to 0.4 % were obtained, depending on the nature of the feeder cells. L. multiflorum feeder cells induced a 6-fold higher plating efficiency than feeder cells of O. ridleyi. In combination, O. ridleyi and L. multiflorum feedercells further enhanced protoplast plating efficiency. Protoplast-derived cell colonies were not obtained from protoplasts of either indica varieties in the absence of feeder cells. MS-based medium containing kinetin (2.0 mg l−1) and α-naphthaleneacetic acid (0.5 mg 1−1), together with sucrose and maltose both at 1.5 % (w/v), induced green shoot regeneration in 44 % of protoplast-derived tissues, depending on the feeder cells used for protoplast culture. In both varieties, tissues obtained using O. ridleyi feeder cells were more morphogenic than tissues obtained using L. multiflorum feeder cells, either alone or in combination with cells of O. ridleyi. In the japonica rice variety Taipei 309, this new procedure resulted in a 30-fold increase in plant regeneration from protoplasts compared to previous published procedures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00232786
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