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  • 1
    Electronic Resource
    Electronic Resource
    Fiber Bragg Grating Sensor/Piezoelectric Actuator Hybrid System for Damage Detection in Composite Laminates (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 949-952 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, fiber Bragg grating (FBG) sensor and piezoelectric (PZT) actuator are used todevelop a hybrid system for the evaluation of delamination in glass fiber-reinforced epoxy (GF/EP)composite laminates. The surface-bonded PZT actuator generates ultrasonic Lamb wave in thecomposite laminates, while the FBG sensor, which is embedded in the composite laminates, capturesthe Lamb wave signal. Wavelet analysis is introduced to extract signal spectrographic characteristicsin the time-scale domain appropriately. Since the propagation characteristics of Lamb wave is alteredby the existence of damage in the composite laminates, delamination information can be obtainedfrom the received signal. With the assistance of a signal generation and an acquisition system, thismethodology enables active sensing and non-destructive evaluation of delamination in the compositelaminates. Experiments have been carried out with GF/EP composite beams to examine the feasibilityof the proposed detection technique. The acquired and processed Lamb wave signals corresponding todifferent delamination sizes are compared
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.949.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Altered brain response to verbal learning following sleep deprivation (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 403 (2000), S. 655-657 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The effects of sleep deprivation on the neural substrates of cognition are poorly understood. Here we used functional magnetic resonance imaging to measure the effects of 35 hours of sleep deprivation on cerebral activation during verbal learning in normal young volunteers. On the basis of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35001068
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  • 3
    Electronic Resource
    Electronic Resource
    Spiropiperidines as high-affinity, selective .sigma. ligands. (1992)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 35 (1992), S. 2033-2039 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00089a013
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of carbide nanorods (1995)
    [s.l.] : Nature Publishing Group
    Nature 375 (1995), S. 769-772 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Our preparation of carbide nanorods involves the reaction of carbon nanotubes with volatile metal or non-metal complexes (Fig. 1). The carbon nanotubes used in these vapour-solid reactions were obtained from metal-catalysed growth using ethy-lene and hydrogen6. This procedure yields relatively pure ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/375769a0
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of homologous recombination in cultured mammalian cells in transient expression and stable transformation assays (1986)
    Springer
    Somatic cell and molecular genetics 12 (1986), S. 63-72 
    Details
    ISSN: 1572-9931
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Recombination between plasmid molecules, each containing a nonoverlapping deletion mutation in the hamster adenine phosphoribosyltransferase gene, was measured after coinjection into rat cells. Using these two plasmids, as linear or circular molecules, the recombination efficiency was measured soon after injection in a transient expression assay or after selection for stable transformants. The transient assay revealed that linear molecules were a better substrate for recombination, with double strand breaks within the region of homology stimulating recombination more than breaks outside the region of homology. A 20 to 70-fold increase in the efficiency of recombination was observed when two linear molecules were coinjected as compared to two circular molecules. Linear molecules were found to not only stimulate recombination but also to facilitate stable integration of the recombinant molecule into the host genome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01560728
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of cell cycle position on transformation by microinjection (1985)
    Springer
    Somatic cell and molecular genetics 11 (1985), S. 43-51 
    Details
    ISSN: 1572-9931
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We have investigated the effect of cell cycle position on the efficiency of transformation by microinjection. Linear recombinant plasmids transform synchronized cells with similar frequencies following injections at all cell cycle stages, whereas supercoiled molecules show a decreased ability to generate transformants in early S phase. This inhibition is not due to an inability to transiently express a transferred gene, since cells at all stages of the cycle efficiently expressed a hamster adenine phosphoribosyltransferase gene introduced on a supercoiled plasmid. Southern transfer analyses of the cell cycle specific transformants revealed that tandem arrays of plasmids, integrated into the host chromosomes, could be generated at all cell cycle stages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01534733
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  • 7
    Electronic Resource
    Electronic Resource
    A refined model for performance analysis of output-buffered Banyan networks (2000)
    Springer
    Telecommunication systems 13 (2000), S. 393-411 
    Details
    ISSN: 1572-9451
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In this paper, a new analytical model for performance analysis of output-buffered Banyan networks is proposed. In this model, we consider not only the number of packets stored in a buffer, but also the state of the buffer's Head of Line (HOL) packet (“new” or “blocked”). Simulations are used to verify the model's accuracy. The analytical results show that the maximum throughput decreases when the switch size increases, and that the throughput increases as the buffer size increases. When the buffer size is large enough, say 10, the maximum throughput is close to saturation. The maximum normalized delay increases almost linearly with the increase in buffer size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019160510395
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  • 8
    Electronic Resource
    Electronic Resource
    Delay bounds for packet satellite protocols (1997)
    Springer
    Telecommunication systems 8 (1997), S. 277-291 
    Details
    ISSN: 1572-9451
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Two simple and tight delay lower bounds are derived for packet satellite protocols with memoryless packet arrival process and single copy transmission. One bound is for protocols with contention‐free reservation and the other is for protocols with contention‐based reservation. The derivation indicates that for minimum delay, a protocol should strive to maintain a balance between transmitting packets immediately and making reservations before transmissions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019169606393
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  • 9
    Electronic Resource
    Electronic Resource
    Learning approaches, study time and academic performance (1995)
    Springer
    Higher education 29 (1995), S. 329-343 
    Details
    ISSN: 1573-174X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract This study investigated the relationship between learning approach, time spent studying and grades awarded. A class of mechanical engineering students (N=34; male) were asked to keep an hour-by-hour study diary for one week. The Biggs' Study Process Questionnaire (SPQ) provided measures of these students' approach to study tasks. Use of a surface approach to learning was found to be positively correlated with both high attendance in class and greater hours of independent study time. The former is explained by the surface learner's need for the lecturer to define the course; the latter by the inefficiency of a surface approach. Poor grades in spite of long study hours mirror an inefficient surface approach. This finding suggests the need for individual study counselling. Case studies show that the use of a deep approach does not result in good grades unless accompanied by sufficient work. The diary method in conjunction with the SPQ appears to be a promising method for researching workload, study times and other related variables.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384497
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  • 10
    Electronic Resource
    Electronic Resource
    A method for preparation of etched collagen fibers that support neurite outgrowth (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 1 (1990), S. 225-232 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Use of collagenous substrates for growth of attachment-dependent and attachment-independent cells have been reported in the literature. Growth of fibroblasts and epithelial cells on collagen sponges and fibers has been previously studied in our laboratory. This article reports the result of studies of neurite outgrowth on etched collagen fibers in cell culture. Collagen fibers with a mean diameter of about 134 μm were etched on glass coverslips using a collagenase solution until individual fibrils of 1 μm in diameter were observed. The kinetics of etching were optimized at a calcium chloride concentration of 5 mM and a collagenase activity of 300 unit/mL. At room temperature an etching time of 10 h maximized the number of fibrils exposed per fiber. Cell culture studies on etched collagen fibers indicate that neurites from rat fetal cortical neurons elongate along the longitudinal axes of collagen fibrils. In some instances the cell body observed was not on top of the collagen fibrils but situated between two parallel fibrils. Results of these experiments indicate that growth of neurites along collagen fibrils in cell culture may be a useful model to evaluate neurite extension in the presence of neurotrophic factors as well as to study optimization of substrates for nerve regeneration.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770010305
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