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  • Springer  (17)
  • American Physical Society (APS)
  • 1990-1994  (17)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 59 (1994), S. 541-543 
    ISSN: 1432-0630
    Keywords: 42.65.−k
    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 brief overview on second-harmonic generation and sum-frequency generation as surface analytical tools is given with a discussion on the intrinsic limitations of the techniques often encountered in the applications. The possibly of using nonlinear optical processes for surface studies has attracted increasing attention in recent years. Optical Second-Harmonic Generation (SHG) and Sum-Frequency Generation (SFG), in particular, have been well accepted as viable surface probes [1]. They have many advantages over the conventional techniques. By nature, they are highly surface-specific and has a submonolayer sensitivity. As coherent optical processes, they are capable of in-situ probing of surface in hostile environment as well as applicable to all interfaces accessible by light. With ultrafast pump-laser pulses, they can be employed to study surface-dynamic processes with a subpicosecond time resolution. These advantages have opened the door to many exciting research opportunities in surface science and technology. This paper gives a brief overview of this fast-growing new area of research.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 50 (1990), S. 535-539 
    ISSN: 1432-0649
    Keywords: 42.50 Md ; 68.35 Ja ; 82.20 Rp ; 82.80 Ch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss the possibility of observing photon echoes in the infrared range from a surface monolayer. Three different detection schemes are considered: direct infrared detection, external up-conversion, and in-situ up-conversion. The external up-conversion scheme appears most promising, while the in-situ up-conversion scheme has the advantage of being highly surface specific. Dephasing relaxations of surface vibrational excitations should be measurable.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-0727
    Keywords: diagnosis ; redundant memory ; repair ; WSI ; yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In this article, yield enhancement and manufacturing throughput of large repairable memories are analyzed. These objectives are met by repairability/unrepairability detection. Initially two new techniques for detection of memory chips with redundancy are presented. Initially, a heuristic, yet efficient approach is proposed. This first approach is based on finding a very good approximation to the minimum covering set. An algorithm, which executes in quadratic time with respect to the largest dimension of the memory, is presented. This algorithm is executed off-line, that is, when the memory has been fully diagnosed. New conditions for detection are presented and fully analyzed. These are based on a more accurate estimation of the regions of repairability and unrepairability. Hence, this results in a reduction of the uncertainty region, where the status of a memory cannot be established without executing a fully exhaustive search algorithm. The second approach to repairability/unrepairability detection is based on a more complex covering relationship, namely the generalized leading element. A model for manufacturing throughput of large repairable memories is presented. A new repair algorithm which utilizes a ternary tree approach, is also presented. This repair algorithm is perfect in the sense that it finds the optimal repair-solution (whenever one exists) after the memory has not been diagnosed unrepairable. Illustrative examples and simulation results show that considerable improvements for average and the worst-case analysis over existing techniques can be achieved.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1434-6079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent calculations of doubly-excited states for two and four-electron states in neutral atoms and ions are described. In particular the radiative properties of these states are considered. It is pointed out that some of these states live so long that triply-excited states perhaps can be formed in neutralisation processes at surfaces.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1572-8935
    Keywords: Fourtain flow ; Injection mold filling ; Finite element method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The viscous flow in the filling stage of injection molding can be described in terms of an one-dimensional fully developed main flow and a complex two-dimensional flow near the advancing front, which is often termed the ”fountain flow“. The transport characteristics in the front region of the mold flow are of increasing importance in injection process of composite materials such as resin injection molding (RIM). By using of finite element method, the simulation of non-isothermal viscous flow between two isothermal parallel plates with the generalized newtonian fluid is presented in detail. The ”un-folding” of the fluid particles towards the mold wall directly affects transport characteristics such as the distribution of temperature, the orientation and the concentration of molecule near the front in filling stage.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 76 (1994), S. 89-96 
    ISSN: 1573-5060
    Keywords: Indica rice ; Oryza sativa ; radiation mutagenesis ; thermo-sensitive male sterility ; pollen ; vigour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Male-sterile mutants were isolated from M2 and M3 generations of indica rice variety 26 Zhaizao, dry seeds of which had been exposed to 60Co-γ rays at a dose of 290 Gy. The mutants were planted in early season and ratooned in late season for two successive years for identification of fertility conversion in different growing seasons. One of the mutant lines was further observed in a growth chamber and in the field. Results showed that daily average temperature might be the major factor conditioning the male fertility conversion at a moderate daylength. The critical temperature for the male fertility conversion of the mutant grown under 12.5 h and 14.0 h daylength is about 23°C, below which the plant becomes completely male sterile. Its male fertility conversion character differs from other EGMS lines so far developed. The performance of the hybrids between the mutant and some other indica varieties demonstrated its good combining ability and its potential value in hybrid rice production. The obtained mutant line still sheds KI-stainable pollen grains under male sterilizing conditions. Nevertheless, pollen grains shed from the male sterile plants were much more vulnerable than from normal plants. At sucrose concentration below 1.5 M, the pollen grains from the mutant grown under male sterilizing conditions almost completely broke down, while above 1.5 M they became plasmolysed and shrunken. This is indicative of poor development of the membrane and walls of the pollen grains from the male sterile mutant, causing the pollen grains to be unfunctional. NBT test also clarified the abortion of the pollen grains from the mutant, which were formed in the male sterilizing environment.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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