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  1. Article ; Online: A pulsed positronium beam using a positron buffer gas trap.

    Machacek, J R / Buckman, S J / Sullivan, J P

    The Review of scientific instruments

    2020  Volume 91, Issue 3, Page(s) 33311

    Abstract: We describe the operation of a pulsed positronium beam based on a two-stage buffer gas positron trap (BGT) or a Surko trap. The BGT allows the areal density and temporal spread of the positron beam to be tailored. This tailored positron beam is used to ... ...

    Abstract We describe the operation of a pulsed positronium beam based on a two-stage buffer gas positron trap (BGT) or a Surko trap. The BGT allows the areal density and temporal spread of the positron beam to be tailored. This tailored positron beam is used to form a positronium beam via charge exchange with an atomic or molecular gas. The resulting positronium beam is energy tunable, and the collimated beam relies on the angular differential positronium production cross section of the atomic or molecular gas used.
    Language English
    Publishing date 2020-04-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/1.5128012
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Bayesian Calibration of a Natural State Geothermal Reservoir Model, Krafla, North Iceland

    Scott, S. W. / O’Sullivan, J. P. / Maclaren, O. J. / Nicholson, R. / Covell, C. / Newson, J. / Guðjónsdóttir, M. S.

    Water resources research. 2022 Feb., v. 58, no. 2

    2022  

    Abstract: The Krafla area in north Iceland hosts a high‐temperature geothermal system within a volcanic caldera. Temperature measurements from boreholes drilled for power generation reveal enigmatic contrasts throughout the drilled area. While wells in the western ...

    Abstract The Krafla area in north Iceland hosts a high‐temperature geothermal system within a volcanic caldera. Temperature measurements from boreholes drilled for power generation reveal enigmatic contrasts throughout the drilled area. While wells in the western part of the production field indicate a 0.5–1 km thick near‐isothermal (∼210°C) liquid‐dominated reservoir underlain by a deeper boiling reservoir, wells in the east indicate boiling conditions extending from the surface to the maximum depth of drilled wells (∼2 km). Understanding these systematic temperature contrasts in terms of the subsurface permeability structure has remained challenging. Here, we present a new numerical model of the natural, pre‐exploitation state of the Krafla system, incorporating a new geologic/conceptual model and a version of TOUGH2 extending to supercritical conditions. The model shows how the characteristic temperature distribution results from structural partitioning of the system by a rift‐parallel eruptive fissure and an aquitard at the transition between deeper basement intrusions and high‐permeability extrusive volcanic rocks. As model calibration is performed using a Bayesian framework, the posterior results reveal significant uncertainty in the inferred permeability values for the different rock types, often exceeding two orders of magnitude. While the model shows how zones of single‐phase supercritical vapor develop above the deep intrusive heat source, more data from deep wells is needed to better constrain the extent and temperature of the deep supercritical zones. However, the model suggests the presence of a significant untapped resource at Krafla.
    Keywords Bayesian theory ; heat ; mathematical models ; permeability ; power generation ; research ; temperature ; uncertainty ; vapors ; water ; Iceland
    Language English
    Dates of publication 2022-02
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 5564-5
    ISSN 1944-7973 ; 0043-1397
    ISSN (online) 1944-7973
    ISSN 0043-1397
    DOI 10.1029/2021WR031254
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: School Health Problems Through the Years: Boston Public Schools, 1635-1935.

    Sullivan, J P

    American journal of public health and the nation's health

    2007  Volume 25, Issue 9, Page(s) 1001–1006

    Language English
    Publishing date 2007-10-25
    Publishing country United States
    Document type Journal Article
    ZDB-ID 121100-6
    ISSN 1541-0048 ; 0002-9572 ; 0090-0036
    ISSN (online) 1541-0048
    ISSN 0002-9572 ; 0090-0036
    DOI 10.2105/ajph.25.9.1001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Present Status of Safety Education in Some Representative School Systems.

    Sullivan, J P

    American journal of public health and the nation's health

    2007  Volume 28, Issue 10, Page(s) 1175–1184

    Language English
    Publishing date 2007-10-25
    Publishing country United States
    Document type Journal Article
    ZDB-ID 121100-6
    ISSN 1541-0048 ; 0002-9572 ; 0090-0036
    ISSN (online) 1541-0048
    ISSN 0002-9572 ; 0090-0036
    DOI 10.2105/ajph.28.10.1175
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: A comparison of experimental and theoretical low energy positron scattering from furan.

    Cheong, Z / Moreira, G M / Bettega, M H F / Blanco, F / Garcia, G / Brunger, M J / White, R D / Sullivan, J P

    The Journal of chemical physics

    2020  Volume 153, Issue 24, Page(s) 244303

    Abstract: This paper presents a joint experimental and theoretical study of positron scattering from furan. Experimental data were measured using the low energy positron beamline located at the Australian National University and cover an energy range from 1 eV to ... ...

    Abstract This paper presents a joint experimental and theoretical study of positron scattering from furan. Experimental data were measured using the low energy positron beamline located at the Australian National University and cover an energy range from 1 eV to 30 eV. Cross sections were measured for total scattering, total elastic and inelastic scattering, positronium formation, and differential elastic scattering. Two theoretical approaches are presented: the Schwinger multichannel method and the independent atom method with screening corrected additivity rule. In addition, our data are compared to corresponding electron scattering results from the same target with a number of significant differences observed and discussed.
    Language English
    Publishing date 2020-12-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/5.0027874
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Near-Threshold Ionization of Argon by Positron Impact.

    Babij, T J / Machacek, J R / Murtagh, D J / Buckman, S J / Sullivan, J P

    Physical review letters

    2018  Volume 120, Issue 11, Page(s) 113401

    Abstract: The direct single-ionization cross section for Ar by positron impact has been measured in the region above the first ionization threshold. These measurements are compared to semiclassical calculations which give rise to a power law variation of the cross ...

    Abstract The direct single-ionization cross section for Ar by positron impact has been measured in the region above the first ionization threshold. These measurements are compared to semiclassical calculations which give rise to a power law variation of the cross section in the threshold region. The experimental results appear to be in disagreement with extensions to the Wannier theory applied to positron impact ionization, with a smaller exponent than that calculated by most previous works. In fact, in this work, we see no difference in threshold behavior between the positron and electron cases. Possible reasons for this discrepancy are discussed.
    Language English
    Publishing date 2018-03-16
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.120.113401
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: The ethics and politics of abortion.

    Sullivan, J P

    Philosophy of the social sciences

    2001  Volume 17, Issue 3, Page(s) 413–425

    MeSH term(s) Abortion, Induced ; Abortion, Legal ; Attitude ; Beginning of Human Life ; Cultural Diversity ; Ethics ; Fetus ; Homicide ; Humans ; Individuality ; Life ; Moral Obligations ; Personhood ; Philosophy ; Politics ; Pregnancy ; Pregnant Women ; Public Policy ; Quality of Life ; Religion ; Social Responsibility ; Social Values ; Socioeconomic Factors ; Theology ; United States ; Value of Life
    Language English
    Publishing date 2001-09-17
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1494070-x
    ISSN 1552-7441 ; 0048-3931
    ISSN (online) 1552-7441
    ISSN 0048-3931
    DOI 10.1177/004839318701700307
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Book ; Conference proceedings: Amorphous and nanostructured carbon

    Sullivan, J.P

    symposium [held at the 1999 MRS Fall Meeting], held November 29 - December 2, 1999, Boston, Massachusetts, U.S.A

    (Materials Research Society symposium proceedings ; v. 593)

    2000  

    Event/congress MRS Fall Meeting (1999, 1999.11.29-12.02, BostonMass.) ; Symposium (1999.11.29-12.02, BostonMass.)
    Author's details ed.: J.P. Sullivan
    Series title Materials Research Society symposium proceedings ; v. 593
    Keywords Amorphous substances ; Carbon ; Nanostructured materials ; Tubes
    Language English
    Size XVII, 565 S
    Publisher Materials Research Society
    Publishing place Warrendale, Pa
    Document type Book ; Conference proceedings
    Note Includes bibliographical references and index
    ISBN 1558995013 ; 9781558995017
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  9. Article ; Online: Electron scattering from pyrazine: elastic differential and integral cross sections.

    Palihawadana, P / Sullivan, J P / Buckman, S J / Brunger, M J

    The Journal of chemical physics

    2012  Volume 137, Issue 20, Page(s) 204307

    Abstract: We report on new measurements for elastic electron scattering from pyrazine. Absolute differential cross sections (DCSs) at seven discrete energies in the range 3-50 eV, and over the scattered electron angular range 10°-129°, were determined using a ... ...

    Abstract We report on new measurements for elastic electron scattering from pyrazine. Absolute differential cross sections (DCSs) at seven discrete energies in the range 3-50 eV, and over the scattered electron angular range 10°-129°, were determined using a crossed electron-molecular beam spectrometer in conjunction with the well-established relative flow technique. Integral elastic cross sections were subsequently derived from those DCS data at each energy. Where possible comparison between the present results and those from sophisticated Schwinger multichannel and R-matrix computations is made, with generally quite good quantitative accord being found. Finally, in order to better study some of the rich resonance structure predicted by theory, results from elastic electron excitation functions are presented.
    Language English
    Publishing date 2012-11-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/1.4767570
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Infection control: it doesn't cost, it pays.

    Sullivan, J P

    CDS review

    1994  Volume 87, Issue 8, Page(s) 8–9

    MeSH term(s) Humans ; Infection Control/economics ; Infectious Disease Transmission, Patient-to-Professional/prevention & control ; Infectious Disease Transmission, Professional-to-Patient/prevention & control ; Practice Management, Dental ; United States ; United States Occupational Safety and Health Administration
    Language English
    Publishing date 1994-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 604568-6
    ISSN 0091-1666
    ISSN 0091-1666
    Database MEDical Literature Analysis and Retrieval System OnLINE

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