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  • 1
    Electronic Resource
    Electronic Resource
    Temperature dependence of the harmonic distortion in InGaAsP distributed feedback lasers (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 6661-6666 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements are reported of the second-harmonic distortion in 1.3-μm InGaAsP distributed feedback lasers operating at different temperatures. A minimum of the second-harmonic distortion exists at a particular bias current when the laser is operating at low temperature (10 °C). The minimum shifts to a higher bias current when the operating temperature is raised. At an even higher temperature, the minimum dissappears. A temperature-dependent model of the second-harmonic distortion, based on an equivalent circuit analysis, is presented to explain the experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345100
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  • 2
    Electronic Resource
    Electronic Resource
    Boron delta-doped Si metal semiconductor field-effect transistor grown by molecular-beam epitaxy (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 1363-1365 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A working p-type Si metal semiconductor field-effect transistor structure, utilizing a boron delta-doped layer as the conducting channel, has been successfully fabricated. Based on Hall measurements, a hole mobility of 120 (180) cm2 V−1 s−1 at 300 (77) K has been obtained. The sheet carrier density of the delta layer was estimated to be about 1.8×1012 cm−2. It is shown that the delta field-effect transistor exhibits an extrinsic transconductance of 640 μS/mm for a gate length of 5 μm, and a high gate to drain breakdown voltage ((approximately-greater-than)18 V). By reducing the gate length to 1 μm, a transconductance of up to 3.2 mS/mm is expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110769
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  • 3
    Electronic Resource
    Electronic Resource
    Investigations of laser array for parallel optical data link applications (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 130-132 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Very low threshold (Ith∼1 mA) lasers emitting near 1.3 μm have been fabricated using multiquantum-well active region, short cavity length, and high reflectivity facet coatings. A laser-array transmitter utilizing these lasers can be operated without prebias and has negligible timing skew for 1 Gb/s operation. No crosstalk is observed when adjacent elements of the laser array are modulated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108251
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of ZrO2 on the texturing and properties of melt-processed Y1Ba2Cu3O7−δ (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 2306-2308 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The addition of ZrO2 is found to be very effective as the nucleation sites to promote the oriented growth of Y1Ba2Cu3O7−δ (YBCO) during peritectic solidification. Extended regions of well- textured YBCO grains with superior superconducting properties of the YBCO bulk are readily obtained by a single-step melt process at much lower process temperatures. At 77 K, the platelike Josephson weak-link behaviors observed in pure melt-processed YBCO have been effectively eliminated, indicating that the coherency between the spherulitic superconducting YBCO grains may have been greatly improved by ZrO2 additions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111652
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  • 5
    Electronic Resource
    Electronic Resource
    10 GHz bandwidth monolithic p-i-n modulation-doped field effect transistor photoreceiver (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2115-2116 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A photoreceiver circuit using an InGaAs p-i-n photodiode and InGaAs/InAlAs pseudomorphic modulation-doped field effect transistor (MODFET) based preamplifier has been fabricated. The 18 μm diam photodiode has a bandwidth of 29 GHz and the ft and fmax of the MODFET are 26 and 30 GHz, respectively. The photoreceiver circuits have bandwidths of 10 GHz and 17 dB gain. The sensitivity at 2.5 Gb/s is −26.4 dBm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110557
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  • 6
    Electronic Resource
    Electronic Resource
    MICROSCOPIC FAILURE MECHANISMS OF AN UNIDIRECTIONAL GLASS FIBER COMPOSITE (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 14 (1991), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract— The tensile failure mechanisms and the effects of manufacture flaws on the tensile behavior of an unidirectional composite (E-glass fiber/epoxy matrix) were investigated. Macroscopic failure processes were determined by an enhanced X-ray radiography technique and microstructural changes analysed by both optical and scanning electron microscopy. An axisymmetric finite element model was developed for analysing the microstress distributions in the composite containing broken fibers in order to determine the effect of local fiber volume fraction on the local failure process. Finally, the measurement of the volume fraction distribution of fiber misalignment was carried out and a simple analytical model was proposed to interpret the fiber misalignment effect. A correlation between the fiber misalignment distribution in the specimens and their tensile strengths was obtained statistically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1991.tb00670.x
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  • 7
    Electronic Resource
    Electronic Resource
    Tc-99m HMPAO labelled WBCs in the detection of occult sepsis in the intensive care unit (1992)
    Springer
    Intensive care medicine 18 (1992), S. 15-19 
    Details
    ISSN: 1432-1238
    Keywords: Tc-99m HMPAO labelled WBCs ; Occult sepsis ; Intensive care unit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In a retrospective study involving 25 patients with occult sepsis in the ICU of Taichung Veterans General Hospital, the sensitivity and specificity of the new diagnostic method, Tc-99m HMPAO labelled white blood cells (WBCs) scan, were compared with other evaluating methods including clinical information, radiograph, ultrasound, bacterial culture, operative findings and pathological report. It was found that Tc-99m HMPAO labelled WBCs scans gave a sensitivity of 96.0%, a specificity of 84.4% and an overall accuracy of 87.3%, as well as the probable causes of false positive and false negative diagnoses were discussed. In conclusion, Tc-99m HMPAO labelled WBCs scans provide a reliable method for imaging of occult sepsis in the ICU.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01706420
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  • 8
    Electronic Resource
    Electronic Resource
    Relationships between coronary artery dilatation and severity of carditis detected by two-dimensional echocardiography and [99mTc] HMPAO-labeled white blood cell heart scan in children with Kawasaki disease (1994)
    Springer
    Pediatric radiology 24 (1994), S. 41-44 
    Details
    ISSN: 1432-1998
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Forty-one children (15 girls, 26 boys; ages 3.0±2.1 years) with Kawasaki disease (KD) were included in our study. The diameters of a total of 82 coronary arteries (CA), comprising 41 left (LCA) and 41 right (RCA), were computed by two-dimensional echocardiography (2D-Echo). If the diameter of the CA was≥20 mm, it was considered as dilated. The severity of the carditis was evaluated by [99mTc] HMPAO-labeled white blood cell (WBC) heart scans (Tc-WBC) carried out in all cases. On the basis of the results the children were divided into three groups. Group A children had the most severe carditis where the heart uptake was greater than the bone uptake; 11 of 32 (34.3%) of the CA in 16 cases were dilated. Group B had carditis of medium severity where the heart uptake was equal to the bone uptake; 11 of 28 (39.3%) of the CA in 14 cases were dilated. Group C had mild carditis where the heart uptake was less than the bone uptake; 9 of 22 (40.9%) of the CA in 11 cases were dilated. There were no significant differences among the three groups (p=0.87 by a chi-squared test). We conclude that no definite relationship exists between the severity of carditis and the dilatation of the CA in children with KD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02017659
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  • 9
    Electronic Resource
    Electronic Resource
    Phytophthora cinnamomi in Shanghai and its possible origin (1992)
    Springer
    Mycopathologia 120 (1992), S. 29-32 
    Details
    ISSN: 1573-0832
    Keywords: Phytophthora cinnamomi ; mating type ; baiting ; origin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Camellia leaves were most effective for recoveringPhytophthora cinnamomi from soils followed by azalea leaves and cedar needles. A total of 131 isolates ofP. cinnamomi was obtained from soils and roots collected in Shanghai. Among them 125 were A1 and 6 were A2 type. There was little variation in morphological and physiological characteristics among 82 isolates tested. It is suggested that the fungus may have been a recent settler in Shanghai.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00578499
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  • 10
    Electronic Resource
    Electronic Resource
    Approximate ground state of the Lipkin model hamiltonian in density-matrix formalism (1991)
    Springer
    The European physical journal 339 (1991), S. 341-348 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.−n ; 24.10.Cn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A method for finding the ground state of a many-body system, which is consistent with the truncation scheme used in the time-dependent density-matrix formalism of Wang and Cassing, is presented and applied to the Lipkin model. It is found that the method gives better ground states than the Hartree-Fock approximation. However, they significantly differ from the exact ground states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01560635
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