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  • 1
    Electronic Resource
    Electronic Resource
    Measurement of intersubband absorption in multiquantum well structures with monolithically integrated photodetectors (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4361-4363 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Intersubband absorption in GaAs/AlGaAs multiple quantum wells (MQW) is measured using a novel integrated detector-waveguide structure. The responsivity spectra of MQW infrared photodetectors is demonstrated to follow exactly the intersubband absorption spectra at various temperatures and bias. The blue shift of the bound-to-continuum state intersubband absorption peak with lowering of temperature is observed to track the change of the conduction-band offset. The absorption peak showed only a slight Stark shift since the field in the wells is small in these narrow-well/thick-barrier structures and partly screened by the high doping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346075
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  • 2
    Electronic Resource
    Electronic Resource
    High sensitivity low dark current 10 μm GaAs quantum well infrared photodetectors (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 851-853 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By increasing the quantum well barrier width, we have dramatically reduced the tunneling dark current by an order of magnitude and thereby significantly increased the blackbody detectivity D@B|BB. For a GaAs quantum well infrared detector having a cutoff wavelength of λc=10.7 μm, we have achieved D*BB =1.0×1010 cm (Hz)1/2/W at T=68 K, a temperature which is readily achievable with a cryogenic cooler.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102682
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  • 3
    Electronic Resource
    Electronic Resource
    Diode-pumped Nd:YAG laser intensity noise suppression using a current shunt (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 1346-1349 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A current shunt actuator has been used to stabilize the intensity of a 10 W cw Nd3+:YAG laser. The current shunt developed exhibited a better actuator response than the pump diode current adjust actuator provided with the laser. Using the current shunt actuator, the relative intensity noise was suppressed from ∼10−51 / Hz to below ∼5 × 10−71 / Hz. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1334627
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  • 4
    Electronic Resource
    Electronic Resource
    Analysis of the dark current in doped-well multiple quantum well AlGaAs infrared photodetectors (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 5656-5658 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the origin of the dark current in λ=8 μm peak wavelength 40-A(ring) GaAs/300-A(ring) Al0.3 Ga0.7 As multiple quantum well photodetectors. By carefully controlling the experimental conditions we have measured the dark current for temperatures in the range 4–120 K. The experimental characteristics are explained by thermionic emission for low biases and tunneling for high biases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343630
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  • 5
    Electronic Resource
    Electronic Resource
    Oxygen and water vapor absorption of radio waves in the atmosphere (1957)
    Springer
    Pure and applied geophysics 37 (1957), S. 127-144 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Calculated values of the gaseous atmospheric absorption are presented for the frequency range 100 to 50,000 Mc at elevations above ground up to at least 130,000 feet, for average conditions during February and August at Bismarck, N. D. and Washington, D. C. Total radio path absorptionsare presented for tropospheric forward scatter communication links for distances of 100, 300 and 1000 miles. The total path absorptions were calculated by summing the absorption contributed by each portion of the atmosphere traversed by a radio ray passing from a 60 foot parabolic antenna resting on the ground to the scattering center and then to a similar receiving antenna. A correlation of total path absorption with the surface value of absolute humidity is developed, thus providing estimates of the range of absorption values in different geographic areas. Maps of average absolute humidity for the world are presented. Previous work on rain absorption is then combined with the present study to provide estimates of the radio power loss due to absorption expected to be exceeded 1 per cent of the time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01988856
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  • 6
    Electronic Resource
    Electronic Resource
    Selection for yield and yield components in the early generations of a potato breeding programme (1986)
    Springer
    Theoretical and applied genetics 73 (1986), S. 218-222 
    Details
    ISSN: 1432-2242
    Keywords: Solanum tuberosum ; Selection efficiency ; Potato breeding ; Yield ; Yield components
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A number of unselected potato (Solanum tuberosum L.) clones were grown at two locations (a seed site and a ware site) in three consecutive years. The repeatability of total yield and yield components in the first two clonal years was compared with the same characters recorded in the third clonal year. Selection for yield in the first clonal year was only marginally more effective than a random reduction in number of genotypes, while selection in the second clonal year appeared to be somewhat more effective as judged by performance in the third clonal year. The inefficiency of selection in the first clonal year was ascribed, at least in part, to the inaccuracy of yield assessment as well as the “carry-over” effect of the mother tubers. Correlations of total yield were higher between different years in the same location than between different locations. Selection under growing conditions suitable for production of seed tubers tended to result in selection of early maturing clones which would not necessarily be optimal for ware growing conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00289277
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  • 7
    Electronic Resource
    Electronic Resource
    Grain isozyme and ribosomal DNA variability in Hordeum spontaneum populations from Israel (1992)
    Springer
    Theoretical and applied genetics 84 (1992), S. 313-322 
    Details
    ISSN: 1432-2242
    Keywords: Hordeum ; Grain ; Isozymes ; Ribosomal DNA ; Genetic adaptation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Grain isozyme and ribosomal DNA (rDNA) variability was examined in Hordeum spontaneum populations sampled from 27 geographical sites in Israel. Considerable phenotypic variability was observed with variants of ADH1, EST3, EST10, BMY1 and WSP detected, which are not available in the H. vulgare gene pool. Seven new rDNA phenotypes were detected in the H. spontaneum populations. Shannon's index of diversity was used to partition the total phenotypic variation into between and within population components. Most of the variation occurred between H. spontaneum populations. The distribution of both grain isozyme and rDNA phenotypes was non-random and correlated with a range of ecogeographical factors. In particular, the G phenotype of BMY1 was restricted to the Negev Desert and Dead Sea regions of Israel. Over 78% of the variation in the frequency of this particular phenotype could be explained by the number of rainy days per year and mean temperature in January. This suggests that variation at this locus or at loci linked to it may be of adaptive significance and of value in the introgression of genes controlling abiotic stress tolerance from H. spontaneum into the H. vulgare gene pool.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229489
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  • 8
    Electronic Resource
    Electronic Resource
    Skin layer effects on the diffusion of carbon tetrachloride into injection moulded polypropylene studied by 1H NMR microimaging (1996)
    Springer
    Journal of materials science 15 (1996), S. 1108-1110 
    Details
    ISSN: 1573-4811
    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
    URL: http://dx.doi.org/10.1007/BF00539951
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  • 9
    Electronic Resource
    Electronic Resource
    A possible mechanism of length activation in insect fibrillar flight muscle (1984)
    Springer
    Journal of muscle research and cell motility 5 (1984), S. 387-397 
    Details
    ISSN: 1573-2657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary When insect fibrillar flight muscle is stretched it becomes more active, as indicated by an increase in oscillatory work output and ATPase activity. Using glycerol-extracted muscle it is demonstrated that this effect is periodic with a repeat of around 3% length change, independent of temperature and ionic strength. This corresponds to 38 nm per half sarcomere, the same repeat as the actin helix. Since there is also a period of 38 nm in the myosin helix the periodic change of activity with muscle length could be caused by filament sliding. This may be the basis of the mechanism of length activation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00818257
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  • 10
    Electronic Resource
    Electronic Resource
    Elliptic solutions of ℂP n-1 models and their properties (1982)
    Springer
    The European physical journal 15 (1982), S. 51-59 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new family of elliptic solutions in the general charge sector of ℂP n-1 model is proposed. Forn=2 these solutions interpolate between merons and arbitrary instantons; forn≧3 the situation is less clear. Various properties are investigated, both in Euclidean and Minkowski space. The solutions are found to interact through a potential rising more slowly than logarithmic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01573425
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