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  • 1
    Electronic Resource
    Electronic Resource
    Low-temperature preparation of superconducting YBa2Cu3O7−δ films on Si, MgO, and SrTiO3 by thermal coevaporation (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 925-926 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We used simple thermal coevaporation of yttrium, barium, and copper in an oxygen atmosphere to produce thin films of the 90 K superconductor, YBa2Cu3O7−δ, on silicon, magnesium oxide, and strontium titanate. The films were deposited on 650 °C substrates and were superconducting when removed from the evaporator. A short post-anneal at 480 °C produced films on bare Si with transition temperatures (R=0) of 85 K. Films as thin as 0.13 μm, superconducting at 91 K (on MgO) and 89 K (on SrTiO3), were obtained with no post-anneal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100647
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  • 2
    Electronic Resource
    Electronic Resource
    Low-frequency noise reduction in SQUID measurements using a laser-driven superconducting switch. Part A: Direct input circuit switching (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 202-208 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe a technique for substantially decreasing the noise in SQUID measurement applications which are intrinsically low frequency or dc and thus fall below the 1/f knee in the SQUID noise energy spectrum. The technique involves reversing the SQUID input leads at a chopping frequency of ∼100 Hz using laser-driven switches which form a double-pole–double-throw network. For sufficiently low noise switching, the demodulate output no longer contains the SQUID low-frequency noise but rather noise at the SQUID white-noise floor. We present data demonstrating the low noise performance of a single laser switch, and include the electronics design required for the full implementation of the scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140461
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  • 3
    Electronic Resource
    Electronic Resource
    Absolute measurement of the diameter of a fused quartz hemisphere at 6 K (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 985-992 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have measured by interferometry the diameter of a fused-quartz hemispherical rotor to 200 nm, or an accuracy of 4 parts-per-million (ppm), at both room temperature and at liquid helium temperature. We placed the rotor in an optically contacted fused-quartz etalon, and used a continuous-wave dye laser to measure the lengths of the optical cavities. The laser frequency was referenced to Doppler-free absorption lines in molecular tellurium and molecular iodine. These measurements were done in order to determine the area of a superconducting ring used in a precision determination of h/me. Our results confirm earlier length measurements at room temperature performed by the National Bureau of Standards (NBS).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140291
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  • 4
    Electronic Resource
    Electronic Resource
    Incorporation of hyperfine probes into the thin-film superconductor YBa2Cu3O7−δ during deposition (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 3224-3226 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Radioactive 111In has been incorporated into oriented thin films of YBa2Cu3O7−δ during a thermal coevaporation process. The hyperfine technique of perturbed γγ-angular correlation spectroscopy shows that 60% of the indium substitutes at a single site in the superconductor. We obtain spectra with reasonable statistics from 2 mCi of starting material, about 1% of which is incorporated into the film. Other methods of incorporating indium into films and bulk YBa2Cu3O7−δ have often resulted in a significant amount of indium being incorporated into impurity phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110205
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  • 5
    Electronic Resource
    Electronic Resource
    Red electroluminescence from ZnGaS:Mn thin films (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2353-2355 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate color shifting from the yellow to the red in the electroluminescence from (ZnGa)S:Mn films. We observe threshold voltages down to about 35 V, extremely low for such devices. We discuss the materials characteristics of the phosphor films, and the potential for improvement of the luminous intensity of the devices. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125012
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  • 6
    Electronic Resource
    Electronic Resource
    Radio-frequency excitation of harmonic microwave radiation from a Penning reflex discharge (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1358-1366 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental results on multiple-harmonic emission at 8.8 GHz from a Penning reflex discharge (PRD) are reported. Observations of the frequency spectra of microwave emission showed copius harmonic generation of frequencies having two completely different origins: (1) spontaneously excited high harmonics of the electron cyclotron frequency and (2) high harmonics of the frequency of an injected signal independent of the magnetic field strength, a phenomenon reported here for the first time. For spontaneous harmonic emission there was a current threshold, whose magnitude depended on gas pressure and magnetic field strength. When a signal was injected, however, high harmonics (up to the 18th) could be seen at discharge currents well below this threshold value. Comparisons between the two types of radiation are made and discussion of possible mechanisms is provided. It is concluded that the coupling efficiency of the radio-frequency (rf)-excited emission is dependent on the relationship between the rf drive frequency and the electron cyclotron frequency. Finite Larmor radius effects may also influence this coupling. The plasma sheath size will also be a factor in the transfer of energy from the probe to the bulk plasma. Results which seek to elucidate these effects are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860925
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  • 7
    Electronic Resource
    Electronic Resource
    Feasibility of day case laparoscopic cholecystectomy in unselected patients (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 51 (1996), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The feasibility of clay ease laparoscopic cholecystectomy was assessed in unselected patients using a standard anaesthetic protocol. Postoperative pain and nausea were assessed at 6 and 24 h postoperatively (visual analogue scale, range 0-10). Thirty-two patients were studied (23 female. 9 male, mean age 49.6 years). The mean duration of surgery was 68 mitt. At 6 h after surgery, 10 patients (31%) had no pain at rest. For the group as a whole, the median pain score was 3 at rest (range 0-6), 4 on movement (0 9), and 5 on coughing (0 9) and eight patients (25%) were nauseated. At 24 It, 15 (46.9%) had no pain at rest. For the group as a whole, the median pain score was I at rest (0-7), 3 (0-6) on movement and 3 on coughing (0 9). The same eight patients were nauseated. Ten patients (31.3%) were judged fit for discharge at 6h, and 28 (87.5%) by 24h. There was no statistical difference in mean age or duration of surgery in those judged fit for early discharge compared to the study group as a whole. Nausea was an important factor in those unfit for discharge at 24 It. Selection criteria might improve these figures. Front the results of our study, 24 h admission is a more realistic goal and will be suitable for most patients requiring laparoscopic cholecystectomy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1996.tb14967.x
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  • 8
    Electronic Resource
    Electronic Resource
    DEVELOPMENT OF A NEW PRODUCT FOR THE CIVIL DEFENSE PROGRAM (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 35 (1970), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: SUMMARY– Development of a new cereal-based product—proposed as a replacement for existing rations now used in the Civil Defense Ration Program—is described. Major emphasis was placed on developing a product containing adequate amounts of protein (46 g/day vs 14 g/day for existing rations) and at a competitive cost. Selection of raw materials, nutritive value and processing conditions were developed to meet these and other criteria of the Office of Civil Defense. Major ingredients were whole wheat flour, casein and lard. The finished product cost was 20c/lb vs 23c/lb for the existing rations. Application of these efforts to other civilian areas is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1970.tb02005.x
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  • 9
    Electronic Resource
    Electronic Resource
    Polyphenoloxidase in Bartlett Pears (1964)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 29 (1964), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The characteristics of polyphenoloxidase in Bartlett pears were investigated. In a citrate-phosphate buffer containing 0.03M catechol as the substrate, activity of the pear polyphenoloxidase was greatest in the pH range 5.8-6.4, being optimum at pH 6.2. The Michaelis constant of the enzyme was 0.048M at pH 6.2 in a citrate-phosphate buffer. It was active only on phenolic compounds having an ortho-diphenolic configuration. Neither the meta- nor para-dihydroxy phenolic compounds nor phenol was attacked. The energy of activation for pear polyphenoloxidase on catechol was 4.9 kcal per mole. Oxygen was necessary for browning of catechol to take place in the presence of pear polyphenoloxidase, and the activity was greatly decreased when the concentration of oxygen in the reaction mixture was lowered. Diethyldithiocarbamate, a copper-chelating agent, and phloroglucinol, a competitive inhibitor, reduced browning markedly, but ascorbic acid was most effective of all. It was noted that ascorbic acid acts as an antioxidant rather than as a true enzyme inhibitor. Iodoacet-amide, a sulfhydryl inhibitor, had no effect on rate of browning. Methods for preventing brown discoloration in canned pears are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1964.tb00456.x
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  • 10
    Electronic Resource
    Electronic Resource
    Loenen, Johannes Hubertus Mathias Marie: De nous in het system, van Plato's philosophie : Amsterdam, Jasonpers, 1951 (1953)
    Cambridge : Cambridge University Press
    The @classical review 3 (1953), S. 156-158 
    Details
    ISSN: 0009-840X
    Source: Cambridge Journals Digital Archives
    Topics: Classical Studies
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0009840X0099591X
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