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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric surgery international 10 (1995), S. 481-484 
    ISSN: 1437-9813
    Keywords: Anorectal malformations ; Vestibuloanorectal fistula ; Perineal canal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Seven girls with a congenital H-type fistula between the vestibule of the vagina and the anorectum are reported. The anus was normally placed in all cases, with the fistula opening into the anterior wall of the lower bowel at the level of the anorectal junction 2–2.5 cm above the anal verge. All seven children underwent surgical repair using a midline perineal approach, a preliminary sigmoid colostomy having been performed in five cases. Satisfactory postoperative results were obtained in six patients. The anatomy and surgical management of this condition are discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of medicinal chemistry 38 (1995), S. 1295-1308 
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Growth and change 28 (1997), S. 0 
    ISSN: 1468-2257
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Economics
    Notes: This paper evaluates the influence of residential density on commuting behavior across U.S. cities while controlling for available opportunities, the technology of transportation infrastructure, and individual socio-economic and demographic characteristics. The measures of metropolitan and local density are addressed separately. It is suggested that metropolitan residential density serves principally as a surrogate for city size. Markets react to high interaction costs found in large cities by raising density rather than density being a cause of those high costs. Local residential density measures relative location (accessibility) within the metropolitan region as well as indexing the level of congestion. Regressions are conducted to predict commuting time, speed, and distance, by mode of travel on a cross-section of individuals nationally and city by city. The results indicate that residential density in the area around the tripmaker's home is an important factor: the higher the density the lower the speed and the shorter the distance. However, density's effect on travel time is ambiguous; speed and distance are offsetting effects on time. The paper suggests a threshold density at which the decrease in distance is overtaken by the congestion effects, resulting in a residential density between 7,500 and 10,000 persons per square mile (neither the highest nor lowest) with the shortest duration auto commutes.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Langmuir 11 (1995), S. 2504-2507 
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2524-2526 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a scheme for the coherent detection of freely propagating continuous-wave terahertz radiation using electro-optic detection. The terahertz radiation is generated by photomixing two single-mode laser diodes in an antenna fabricated on low-temperature-grown GaAs. This radiation is detected using the electro-optic effect in 〈110〉 ZnTe. In contrast to typical terahertz detection techniques, this is a frequency-domain measurement that relies on coherent up-conversion of the terahertz field combined with optical homodyning to suppress background noise. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 2460-2470 
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nonpenetrative thermal convection at Ra=2×107 in a water layer of large-aspect ratio has been studied using Particle Image Velocimetry (PIV) to measure two-dimensional velocity vectors in a vertical plane. A sequence of 117 PIV photographs has been obtained with sufficient time separation between photographs to ensure statistical independence at least for the turbulent motions with time scales on the order of z*/w*. The grid spacing of the resulting velocity fields is adequate to resolve the smallest structures in the flow. Results include the development of motion with the onset of heating. The data set, obtained for fully developed turbulent flow, has been analyzed to obtain mean and rms velocities, vertical velocity skewness, two-point correlations, and stochastic estimates of velocity fields conditioned upon one and two-point events. A significant result is the absence of a discernible large scale circulation or mean flow with length scale on the order of the horizontal dimension of the fluid layer. Instead, the two-point correlations and stochastic estimates reveal the presence of roll cells whose horizontal length scale is equal to the layer depth. The measured values of vertical velocity skewness are in agreement with atmospheric measurements and large eddy simulations. The overall physical interpretation of the data suggests a seemingly chaotic and disordered motion, underlying which is a roll-cell mode with unit aspect ratio, punctuated by plumes emanating from the lower boundary. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 83-86 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We measured the polarization dependence of the Bragg diffraction efficiency of a crystalline colloidal array and compared the experimental results to that predicted by theory. The diffraction efficiency for π polarized light decreases to zero for an incidence angle of 45° to the diffracting planes. Our experimental diffraction and transmission results quantitatively agree with the predictions of dynamical diffraction theory. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 746-748 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the application of optical second-harmonic generation to the measurement of ultrafast electrical pulses. The technique relies on the sensitivity of the second-harmonic response to electric fields in centrosymmetric materials. Electrical pulses propagating on a silicon-based coplanar transmission line have been characterized with subpicosecond time resolution and 100 mV/(square root of)Hz sensitivity. We have measured the bias dependence of the second harmonic intensity over a 20 V range and have used this data to calibrate the transient response. The observed full-width at half maximum response time of the SHG waveform is ∼1 ps, which is consistent with the value obtained from an electronic cross-correlation measurement. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2321-2323 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a scheme for exploiting the nonresonant second-order nonlinearities in electro-optic media to extend the bandwidth of coherent spectroscopy in the far-infrared using ultrafast laser pulses. Using optical rectification and electro-optic sampling in 〈110〉 ZnTe for the generation and coherent detection of freely propagating THz radiation, respectively, we have demonstrated spectral sensitivity beyond 3 THz. This was accomplished by achieving phase matching for both optical rectification and electro-optic sampling over a broad range of THz frequencies. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 150-152 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the demonstration of an electro-optic sampling technique that allows for the detection of freely propagating terahertz radiation. Coherent sampling is performed in a poled polymer device that is physically separated from the emitter. The poling electrodes in the sampling element are found to have an integrating effect on the incident terahertz field. The shot noise limited minimum detectable field in the polymer is 100 (mV/cm)/(square root of)Hz. We discuss methods by which the sensitivity may be significantly enhanced. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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