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  • 1
    Electronic Resource
    Electronic Resource
    Gain and kinetics characteristics of carbon dioxide (12CO2 and 13CO2) pulsed lasers (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 1145-1148 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100340a025
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of the vibration-translation transfer rate on laser-induced frequency chirp in a long-pulse CO2 laser (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2086-2088 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A frequency sweeping (chirping) mechanism governed by the lasing gas pressure and composition has been observed in a long-pulse TE CO2 laser for the first time. The mechanism was detected in heterodyned data obtained from photomixing the pulsed laser output with a cw local oscillator. A theory has been developed which links this chirp-governing mechanism to the vibration-translation (V-T) transfer rate from the lower laser level to the ground state. This new theory extends the existing theories on chirp in pulsed CO2 lasers into the long-pulse regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102980
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  • 3
    Electronic Resource
    Electronic Resource
    A microcomputer-based solid-state nuclear track image analyzer (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 771-778 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A microcomputer-based image processing system has been developed to use with solid-state nuclear track detectors for number counting, area measurement, and location identification. The image digitizer is designed to interface with a microcomputer and a standard black and white TV camera for data acquisition. A spatial dependent segmentation algorithm is proposed for track identification under nonuniform illumination and the low track-pixel population conditions. The system has been tested using Lexan samples irradiated by a Cf-252 spontaneous fission source. The counting accuracy is approximately 3% with a long term stability of 5%. Efficiency calibration was performed using samples with track densities up to 104/mm2. Results indicate that the proposed track identification scheme tends to reduce the track overlap effect and the system behaves as a nonparalyzable counting system. For track densities below 3000/mm2, either a paralyzable or a nonparalyzable counter model can be established with an accuracy better than 0.5%. For track densities below 1500/mm2, the track registration efficiency is in good agreement with manual counting results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141017
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Observation of quantum confinement effects in strained Si0.84Ge0.16/Si quantum wells at room temperature (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 2713-2715 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the first study of quantum confinement shifts of energy gap in strained Si0.84Ge0.16/Si quantum wells at room temperature by photothermal deflection spectroscopy (PDS) technique. The experimental results obtained from the amplitude and phase of the PDS signal are in good agreement with quantum well subband calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109241
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  • 5
    Electronic Resource
    Electronic Resource
    Physical mapping of four RAPDs in the B chromosome of maize (1997)
    Springer
    Theoretical and applied genetics 94 (1997), S. 534-538 
    Details
    ISSN: 1432-2242
    Keywords: Key words Zea mays ; B chromosome ; RAPD ; B-A translocation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Four DNA fragments were amplified specifically from the B chromosome by PCR using random 10-base oligonucleotides as primers. The location of the fragments in the B chromosome was determined based on whether or not they were amplified from the hypo- ploid DNA generated by four B-A translocations, three of which break in the proximal euchromatic region and the fourth in the distal one-third of the heterochromatic region on the B long arm. Since the hypoploid DNA carries the portion of the B chromosome distal to the breakpoint of a translocation, the presence of a fragment in the hypoploid DNA, but not in the control (which is devoid of any B chromatin), indicates that the fragments is located in the B region distal to the breakpoint in the B long arm. Two fragments were mapped to the euchromatic region and two others to either the distal portion of the euchromatic region or the proximal two-thirds of the heterochromatic region. These fragments in turn mapped three B-A translocations whose breakpoints were located in the euchromatic region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050448
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  • 6
    Electronic Resource
    Electronic Resource
    Multielement NAA for the characterization of Saudi Arabian rocks (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 109 (1987), S. 201-211 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The instrumental neutron activation analysis technique (INAA) was used in the qualitative and quantitative analysis of 48 geological samples from the Umm Al-Birak area in the Kingdom of Saudi Arabia. The samples were properly prepared together with their standards and simultaneously irradiated in a neutron flux of 2.4 ·1012 n·cm−2 s−1 in the reactor facilities of the National Tsing Hua University (THOR) in Taiwan. Gamma-spectra from the high resolution Ge(Li) detector were analyzed using the BRUTAl code. As a result of the analysis of the geological samples, 20 trace elements were identified qualitatively and quantitatively. These elements are: Co, Cr, Eu, Fe, Hf, K, La, Lu, Na, Rb, Sc, Sm, Ta, Tb, Th, U, Yb, Zn and Zr. The concentrations of these elements have been used in the investigations of the geochemistry of the Umm Al-Birak microgranite site using the BMDP computer code of the Ministry of Petroleum and Mineral Resources. This investigation showed that the high grade area is a differentiated rock that crystallized in a late stage of the Umm Al-Birak microgranite area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02117536
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of uranium and thorium concentrations in integrated circuit packaging materials (1989)
    Springer
    Journal of radioanalytical and nuclear chemistry 137 (1989), S. 341-350 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The purpose of the present research is to find a suitable technique to measure trace amount of uranium and thorium and to determine the surface α-flux in silicon compound /SiO/ used for fabrication of integrated circuit packaging materials. Among several commonly-used detecting techniques, it was found that neutron activation analysis /NAA/ was most promising. The results from NAA show a large difference in uranium and thorium concentrations when cadmium and boron carbide shields are used, whereas α-flux measurements show a low α-activity, which corresponds to the trace amount of uranium and thorium expected to be present in these materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02162462
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