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  • American Institute of Physics (AIP)  (5)
  • American Association for the Advancement of Science (AAAS)  (3)
  • 1985-1989  (8)
  • 1986  (8)
  • 1
    Electronic Resource
    Electronic Resource
    TMX-U computer system in evolution (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1880-1882 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Over the past three years, the total TMX-U diagnostic data base has grown to exceed 10 Mbytes from over 1300 channels; roughly triple the originally designed size. This acquisition and processing load has resulted in an experiment repetition rate exceeding 10 min per shot using the five original Hewlett–Packard HP-1000 computers with their shared disks. Our new diagnostics tend to be multichannel instruments, which, in our environment, can be more easily managed using local computers. For this purpose, we are using HP series 9000 computers for instrument control, data acquisition, and analysis. Fourteen such systems are operational with processed format output exchanged via a shared resource manager. We are presently implementing the necessary hardware and software changes to create a local area network allowing us to combine the data from these systems with our main data archive. The expansion of our diagnostic system using the parallel acquisition and processing concept allows us to increase our data base with a minimum of impact on the experimental repetition rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139159
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  • 2
    Electronic Resource
    Electronic Resource
    Infrared absorption spectrometer for liquid semiconductors (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1129-1131 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An infrared absorption spectrometer for use with high-temperature liquids is described. The system has been used for liquid semiconductors at temperatures up to 550 °C having absorption edges as low as 0.3 eV. The optical cell consists of a thin (100–600 μm) gasket of graphite foil sandwiched between two optical flat windows and equipped with a fluid reservoir and heating block. This design allows the use of any optical windows chemically compatible with the sample. We have used several infrared windows to measure the optical absorption edge in selenium, selenium–tellurium, and selenium–thallium alloys down to 0.2 eV. This represents an improvement in the previous range of measurement which has been limited by the 0.5-eV cutoff of fused quartz cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138668
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  • 3
    Electronic Resource
    Electronic Resource
    Band broadening of CH2 vibrations in the Raman spectra of polymethylene chains (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 3827-3839 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The isotropic and anisotropic linewidths of methylene vibrations in a homologous series of alkanes of increasing chain length have been measured in the liquid state as a function of temperature. The bandwidths of the CH2 symmetric stretching modes, which are in Fermi resonance with overtones of the CH2 bending vibrations, are temperature insensitive over a 200 K interval; this is best explained in terms of a vibrational dephasing mechanism (inhomogeneous broadening) for these modes. In contrast, for the bending and antisymmetric stretching vibrations, significant band broadening occurs over this same temperature interval. In addition, for these modes, both the absolute value of the bandwidth and the relative rate of increase of the bandwidth with increasing temperature, decrease with increasing chain length. These observations are consistent with a reorientational broadening mechanism as the principal bandwidth contribution for these vibrations. Hindered end-over-end rotation of the molecules, which contributes to the band broadening for very low molecular weight alkanes, rapidly becomes too slow to be observable on the time scale of the Raman experiment for the higher molecular weight alkanes and polyethylene. For longer chain lengths, torsional backbone motions coupled to the high frequency antisymmetric stretching modes can account for the breadth of the bands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450903
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  • 4
    Electronic Resource
    Electronic Resource
    The equation of state of dense argon: A comparison of shock and static studies (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 1028-1033 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: New static high pressure measurements for room temperature solid argon to 800 kbar are in excellent agreement with one predicted from a theoretical reduction of shock wave data. The results demonstrate the agreement between shock and static techniques even in cases where shock temperatures are extremely high and a large thermal correction is required to reduce the Hugoniot to an isotherm. The results suggest that solid argon may provide a useful static pressure standard up to about 3–4 Mbar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451346
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  • 5
    Electronic Resource
    Electronic Resource
    On the Compton defect (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 303-307 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Simple analytical formulas are given for Compton profiles obtained from an exact first Born approximation for K, L, and M subshells. Compton profile asymmetries and Compton defects are investigated and compared with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451656
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  • 6
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    High-pressure ruby and diamond fluorescence: observations at 0.21 to 0.55 terapascal (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-06-13
    Description: A diamond-anvil, high-pressure apparatus was used to extend the upper pressure limit of static laboratory experiments. Shifts of the R(1) strong fluorescent line of ruby were observed that correspond to static pressures of 0.21 to 0.55 terapascal (2.1 to 5.5 megabars) at 25 degrees C. Sensitive spectroscopic techniques in the pressure range 0.15 to 0.28 terapascal were used to observe ruby and diamond fluorescence separately; these two fluorescent emissions overlap strongly at high pressures. At pressures greater than approximately 0.28 terapascal, the diamond fluorescence diminished and the ruby fluorescence reappeared strongly. Pressure was determined by extrapolation of the calibrated shift of the ruby R(1) line.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xu, J A -- Mao, H K -- Bell, P M -- New York, N.Y. -- Science. 1986 Jun 13;232(4756):1404-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17828916" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    A blood vessel model constructed from collagen and cultured vascular cells (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-01-24
    Description: A model of a blood vessel was constructed in vitro. Its multilayered structure resembled that of an artery and it withstood physiological pressures. Electron microscopy showed that the endothelial cells lining the lumen and the smooth muscle cells in the wall were healthy and well differentiated. The lining of endothelial cells functioned physically, as a permeability barrier, and biosynthetically, producing von Willebrand's factor and prostacyclin. The strength of the model depended on its multiple layers of collagen integrated with a Dacron mesh.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weinberg, C B -- Bell, E -- New York, N.Y. -- Science. 1986 Jan 24;231(4736):397-400.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2934816" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aorta/anatomy & histology/cytology ; Blood Vessels/*anatomy & histology/physiology ; Cattle ; Cells, Cultured ; Collagen/*physiology ; Endothelium/anatomy & histology/cytology ; Microscopy, Electron, Scanning ; *Models, Cardiovascular ; Muscle, Smooth, Vascular/anatomy & histology/cytology ; Polyethylene Terephthalates
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 8
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    Purification and biochemical characterization of the promoter-specific transcription factor, Sp1 (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-10-03
    Description: The biochemical analysis of cellular trans-activators involved in promoter recognition provides an important step toward understanding the mechanisms of gene expression in animal cells. The promoter selective transcription factor, Sp1, has been purified from human cells to more than 95 percent homogeneity by sequence-specific DNA affinity chromatography. Isolation and renaturation of proteins purified from sodium dodecyl sulfate polyacrylamide gels allowed the identification of two polypeptides (105 and 95 kilodaltons) as those responsible for recognizing and interacting specifically with the GC-box promoter elements characteristic of Sp1 binding sites.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Briggs, M R -- Kadonaga, J T -- Bell, S P -- Tjian, R -- T32 ES07075/ES/NIEHS NIH HHS/ -- New York, N.Y. -- Science. 1986 Oct 3;234(4772):47-52.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3529394" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Chromatography, Affinity ; Chromatography, High Pressure Liquid ; Cricetinae ; Cricetulus ; DNA/metabolism ; DNA-Binding Proteins/*isolation & purification/metabolism ; Electrophoresis, Polyacrylamide Gel ; Gene Expression Regulation ; HeLa Cells/metabolism ; Humans ; Sp1 Transcription Factor ; Transcription Factors/*isolation & purification/metabolism ; Transcription, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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