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  • 1
    Electronic Resource
    Electronic Resource
    rf SQUID detector for single-ion trapping experiments (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4599-4604 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have designed and constructed a novel superconducting detector sensitive enough to detect the axial motion of a single, trapped ion. This detector employs a tuned, superconducting transformer matched to a rf SQUID (superconducting quantum interference device) to yield an effective current sensitivity of 2.7×10−15A/(Hz)1/2 at 160 kHz. To optimize the detection system, we have used existing small-signal equivalent circuit models, and thus have tested these models in a new regime. We include details of our superconducting circuitry and of the modifications required to stabilize the commerical SQUID controls at 160 kHz. Finally, we present typical detected signals from trapped ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340137
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  • 2
    Electronic Resource
    Electronic Resource
    Metabolites of bird's nest fungi-19 - New triterpenoid carboxylic acids from cyathus striatus and cyathus pygmaeus
    Amsterdam : Elsevier
    Tetrahedron 40 (1984), S. 2069-2082 
    Details
    ISSN: 0040-4020
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4020(01)88448-9
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  • 3
    Electronic Resource
    Electronic Resource
    Parameter optimization and optimal attitude response of a passive environmentally controlled space system (1975)
    Springer
    Celestial mechanics and dynamical astronomy 12 (1975), S. 231-249 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Optimal response criteria are developed for the passive attitude control of a composite spacecraft. The physical structure is uniquely different from multi-body systems in that the components are independently and passively stabilized, here the primary body is gravity oriented while the auxiliary body, through geometry selection, is aerodynamically controlled. The Routh-Hurwitz stability criterion is used to obtain the parameter bounds for stability about the preferred dynamic equilibrium position. Further, the least damped mode concept with respect to the roots of the characteristic equation is used to predict conditions for optimum performance. Numerically generated optimal response curves for a satellite in circular orbit show very rapid damping rates for large disturbances up to ten degrees. Under these conditions, and in the absence of external disturbances, course alignment was reached within several orbits and fine pointing accuracy attainable up to altitudes of 650 kilometers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01230215
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  • 4
    Electronic Resource
    Electronic Resource
    15-(para-[123I] iodophenyl) pentadecanoic acid obtained using mercuration and subsequent [123I] radioiodination (1989)
    Springer
    Journal of radioanalytical and nuclear chemistry 132 (1989), S. 377-385 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In an ongoing effort to obtain quantitative, rapid kit type labelling of [123I] radiopharmaceuticals, we have examined organomercury precursors of [123I] 15-(para-iodophenyl)-pentadecanoic acid (IPPA). Chloromercuri derivatives of phenyl pentadecanoic acid (PPA) and the PPA ethyl ester were obtained by mercuration utilizing mercuric trifluoroacetate in trifluoroacetic acid followed by treatment with acetic acid and hydrochloric acid. The most simple compound, chloromercuri PPA, proved insoluble at room temperature in the common solvents useful for radioiodination and purification. The study was extended in a systematic way to chloromercuri PPA ethyl ester and the acetoxy mercuri PPA ethyl ester. As expected, these two compounds posessed successively more useful ranges of solvent compatibility. Iodination and [123I] radioiodination were carried out with the three compounds of PPA. Chloromercuri PPA was dissolved with difficulty in acetic acid at 70°C and 71% radiochemical yield of [123I] IPPA was obtained during the course of a 5 minute reaction utilizing chloramine T. The chloromercuri PPA ethyl ester was dissolved in ethyl acetate/acetic acid (2/1 v/v) at room temperature and 87% radiochemical yield of [123I] IPPA was obtained following 10 minutes reaction. With the acetoxy mercuri PPA ethyl ester it was possible to conduct the radioiodination in ethanol again using chloramine T. A modest radiochemical yield (r. y.) (51%) of [123I] IPPA ethyl ester was obtained after 60 min. It was possible to enhance the radiochemical yield in the presence of lithium acetate (84% r. y.). The isomeric purity of the [123I] IPPA ethyl ester was unexpectedly high (99.9% para) when the radioiodination was conducted at room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02136097
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  • 5
    Electronic Resource
    Electronic Resource
    Book reviews (1992)
    Springer
    Chromatographia 33 (1992), S. 190-191 
    Details
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02275904
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  • 6
    Electronic Resource
    Electronic Resource
    Polymorphism in polymers. I. The equilibrium melting temperature of two crystalline modifications of trans-1,4-polyisoprene (1972)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 10 (1972), S. 1207-1219 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Dilatometric, calorimetric, and dissolution studies have been made of two crystalline modifications of trans-1,4-polyisoprene in order to determine their equilibrium melting temperatures. This parameter is of fundamental importance in the formal treatment of polymorphism in crystalline polymers. A consistent set of thermodynamic parameters has been derived for both crystalline modifications. The equilibrium melting temperature of the polymorph, which was previously observed to melt from carefully crystallized bulk material at 64°C, was calculated to be at least 82.4°C. The other form, which melts from the bulk at 74°C, has an equilibrium melting temperature of 79.5 ± 0.5°C. The trans-1,4-polyisoprene, crystallized by stirring n-butyl acetate solutions at 49°C, was found by x-ray diffraction to be in the first form and melts at 81.2 ± 0.5°C when very slow heating rates are applied. This melting temperature is very close to the independently derived equilibrium melting temperature and lends support to the possibility that extended chain crystals are present in these solution crystallized crystals. Using the newly found melting temperatures of the two crystalline modifications it can be derived from the free energies of fusion that the first crystalline form is more stable at temperatures above approximately 66°C, whereas the other form is more stable below this temperature.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1972.160100703
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  • 7
    Electronic Resource
    Electronic Resource
    Morphology of polyethylene crystallized by solution stirring (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 9 (1971), S. 531-541 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Dilatometric and calorimetric studies have been made of the fusion process of linear polyethylene crystallized by stirring xylene solutions at elevated temperatures. It is shown that the melting point of the crystals increases rapidly from 139.5°C to 145°C in the crystallization temperature range of 100-103°C and levels off to 146 ± 0.5°C, provided that very slow heating rates are employed. Stirrer-crystallized samples treated with fuming nitric acid show higher crystalline contents. Comparison of their enthalpies of fusion and melting points indicate that higher molecular order along the fiber axis is associated with higher crystallization temperatures. This is in general agreement with corresponding results of other modes of crystallization. The attack of fuming nitric acid on stirrer crystals is characterized by weight-loss curves similar to those of dilutesolution crystals and bulk polyethylene. The linear molecular weight dependence on time of exposure to nitric acid suggests that the oxidation proceeds mainly from the chain ends at a constant rate for samples stirred in the lower crystallization range, but an increased rate is observed for a sample stirred from xylene at 105°C. It is suggested that the lamellar overgrowths, most evident at low crystallization temperatures, are epitaxially attached to the fiber axis, whereas the smaller crossbandings observed at higher crystallization temperatures are possibly made up of elements of chains that are only partly incorporated in the highly ordered fibrous core.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.160090311
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  • 8
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    Isomer Shift and Magnetic Moment of the Long-Lived 1/2^{+} Isomer in _{30} ^{79} Zn_{49} : Signature of Shape Coexistence near ^{78} Ni (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-05-06
    Description: Author(s): X. F. Yang, C. Wraith, L. Xie, C. Babcock, J. Billowes, M. L. Bissell, K. Blaum, B. Cheal, K. T. Flanagan, R. F. Garcia Ruiz, W. Gins, C. Gorges, L. K. Grob, H. Heylen, S. Kaufmann, M. Kowalska, J. Kraemer, S. Malbrunot-Ettenauer, R. Neugart, G. Neyens, W. Nörtershäuser, J. Papuga, R. Sánchez, and D. T. Yordanov Two different experiments observe nuclei with excited nuclear states that differ in shape from their ground states, so called shape coexistence. These nuclei lie close to the neutron-rich doubly-magic 78 Ni region of the nuclear chart. [Phys. Rev. Lett. 116, 182502] Published Thu May 05, 2016
    Keywords: Nuclear Physics
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Book reviews (1992)
    Springer
    Details
    Publication Date: 1992-02-01
    Print ISSN: 0009-5893
    Electronic ISSN: 1612-1112
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 10
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    LiDAR-derived snowpack datasets from mixed conifer forests across the western U.S. (2014)
    Wiley
    Details
    Publication Date: 2014-03-04
    Description: Airborne-based Light Detection and Ranging (LiDAR) offers the potential to measure snow depth and vegetation structure at high spatial resolution over large extents and thereby increase our ability to quantify snow water resources. Here, we present airborne LiDAR data products at four Critical Zone Observatories (CZO) in the Western United States: Jemez River Basin, NM, Boulder Creek Watershed, CO, Kings River Experimental Watershed, CA, and Wolverton Basin, CA. We make publicly available snow depth data products (1-m 2 resolution) derived from LiDAR with an estimated accuracy of 〈30 cm compared to limited in situ snow depth observations.
    Print ISSN: 0043-1397
    Electronic ISSN: 1944-7973
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Wiley on behalf of American Geophysical Union (AGU).
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