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Search Results: 1 - 10 of 297463 matches for " J. Sandweiss "
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Review of Speculative "Disaster Scenarios" at RHIC
R. L. Jaffe,W. Busza,J. Sandweiss,F. Wilczek
Physics , 1999, DOI: 10.1103/RevModPhys.72.1125
Abstract: We discuss speculative disaster scenarios inspired by hypothetical new fundamental processes that might occur in high energy relativistic heavy ion collisions. We estimate the parameters relevant to black hole production; we find that they are absurdly small. We show that other accelerator and (especially) cosmic ray environments have already provided far more auspicious opportunities for transition to a new vacuum state, so that existing observations provide stringent bounds. We discuss in most detail the possibility of producing a dangerous strangelet. We argue that four separate requirements are necessary for this to occur: existence of large stable strangelets, metastability of intermediate size strangelets, negative charge for strangelets along the stability line, and production of intermediate size strangelets in the heavy ion environment. We discuss both theoretical and experimental reasons why each of these appears unlikely; in particular, we know of no plausible suggestion for why the third or especially the fourth might be true. Given minimal physical assumptions the continued existence of the Moon, in the form we know it, despite billions of years of cosmic ray exposure, provides powerful empirical evidence against the possibility of dangerous strangelet production.
Observing Spontaneous Strong Parity Violation in Heavy-Ion Collisions
A. Chikanian,L. E. Finch,R. S. Longacre,J. Sandweiss,J. H. Thomas
Physics , 2001, DOI: 10.1103/PhysRevC.65.014908
Abstract: We discuss the problem of observing spontaneous parity and CP violation in collision systems. We discuss and propose observables which may be used in heavy-ion collisions to observe such violations, as well as event-by-event methods to analyze the data. Finally, we discuss simple monte-carlo models of these CP violating effects which we have used to develop our techniques and from which we derive rough estimates of sensitivities to signals which may be seen at RHIC.
First CytoJournal Peer-Reviewer's Retreat in 2006 – Open access, peer-review, and impact factor
Shidham Vinod B,Sandweiss Lynn,Atkinson Barbara F
CytoJournal , 2006, DOI: 10.1186/1742-6413-3-5
Abstract: CytoJournal organized its first Peer-Reviewer's Retreat of 2006 during the United States and Canadian Academy of Pathology Annual Meeting at Atlanta on Feb 12, 2006. The major topics discussed were open access, peer review, and impact factors. Representative participants volunteered to join the task force to prepare an instructional guide for peer-reviewing cytopathology manuscripts. Concern about the impact factor for CytoJournal was discussed. A feedback to its readers and authors was recommended. Impact factor calculation needs at least three years of journal statistics. It is only possible after two years from the time a journal is first accepted by Thomson-ISI for citation tracking. CytoJournal is still too new for an impact factor to be calculated. However, general progress of CytoJournal suggests an encouraging pattern for high impact factor.
Nucleus-Nucleus Bremsstrahlung from Ultrarelativistic Collisions
Sangyong Jeon,Joseph Kapusta,Alexei Chikanian,Jack Sandweiss
Physics , 1998, DOI: 10.1103/PhysRevC.58.1666
Abstract: The bremsstrahlung produced when heavy nuclei collide is estimated for central collisions at the Relativistic Heavy Ion Collider. Soft photons can be used to infer the rapidity distribution of the outgoing charge. An experimental design is outlined.
Expression of Interest for a Comprehensive New Detector at RHIC II
P. Steinberg,T. Ullrich,M. Calderon,J. Rak,S. Margetis,M. Lisa,D. Magestro,R. Lacey,G. Paic,T. Nayak,R. Bellwied,C. Pruneau,A. Rose,S. Voloshin,H. Caines,A. Chikanian,E. Finch,J. W. Harris,M. Lamont,C. Markert,J. Sandweiss,N. Smirnov
Physics , 2005,
Abstract: There are compelling physics questions to be addressed by a new comprehensive detector at a future, high-luminosity RHIC II collider. These form the basis for this Expression of Interest. What precisely are the properties of the strongly-coupled Quark Gluon Plasma (sQGP)? Can a more weakly interacting QGP state be formed and investigated at RHIC? How do particles acquire mass and what is the effect of chiral symmetry restoration on hadronization in a dense medium? What is the chiral structure of the QCD vacuum and its influence on and contributions of different QCD vacuum states to the masses of particles? Is there another phase of matter at low Bjorken-x, i.e. the Color Glass Condensate (CGC)? If present, what are its features and how does it evolve into the QGP? If not, are parton distribution functions understood at low Bjorken-x and can they describe particle production? What are the structure and dynamics inside the proton, including parton spin and orbital angular momentum? What are the contributions of gluons and the QCD sea to the polarization of the proton? What is the flavor-dependence? Are there tests for new physics beyond the Standard Model from spin measurements at RHIC II (such as parity-violating interactions)? We propose that a new comprehensive detector system is needed for RHIC II to address these questions adequately and in an effective way.
Identification of High $\rm p_{\perp}$ Particles with the STAR-RICH Detector
STAR-RICH Collaboration,:,A. Braem,D. Cozza,M. Davenport,G. De Cataldo,L. Dell Olio,D. DiBari,A. DiMauro,J. C. Dunlop,E. Finch,D. Fraissard,A. Franco,J. Gans,B. Ghidini,J. W. Harris,M. Horsley,G. J. Kunde,B. Lasiuk,Y. Lesenechal,R. D. Majka,P. Martinengo,A. Morsch,E. Nappi,G. Paic,F. Piuz,F. Posa,J. Raynaud,S. Salur,J. Sandweiss,J. C. Santiard,J. Satinover,E. Schyns,N. Smirnov,J. Van Beelen,T. D. Williams,Z. Xu
Physics , 2002,
Abstract: The STAR-RICH detector extends the particle identification capapbilities of the STAR experiment for charged hadrons at mid-rapidity. This detector represents the first use of a proximity-focusing CsI-based RICH detector in a collider experiment. It provides identification of pions and kaons up to 3 GeV/c and protons up to 5 GeV/c. The characteristics and performance of the device in the inaugural RHIC run are described.
P16 and Ki67 Immunostains Decrease Intra- and Interobserver Variability in the Diagnosis and Grading of Anal Intraepithelial Neoplasia (AIN)
Ann E. Walts, Juan Lechago, Bing Hu, MaryBeth Shwayder, Lynn Sandweiss and Shikha Bose
Clinical Medicine Insights: Pathology , 2012,
Abstract: Background: Significant variation is reported in the diagnosis of HPV-associated AIN. We previously observed that bandlike positivity for p16 in >90% of contiguous cells coupled with Ki67 positivity in >50% of lesional cells is strongly associated with high grade AIN. This study was undertaken to determine if addition of p16 and Ki67 immunostaining would reduce inter- and intraobserver variability in diagnosis and grading of AIN. Design: H&E stained slides of 60 anal biopsies were reviewed by three pathologists and consensus diagnoses were achieved: 25 negative, 12 low (condyloma and/or AIN I) and 23 high (9 AIN II and 14 AIN III) grade lesions. The H&E stained slides were diagnosed independently by three additional (“participant”) pathologists. Several weeks later they re-examined these slides in conjunction with corresponding p16 and Ki67 immunostains. Results: Addition of p16 and Ki67 immunostains reduced intra- and interobserver variability, improved concurrence with consensus diagnoses and reduced two-step differences in diagnosis. Negative and high grade AIN diagnoses showed the most improvement in concurrence levels. Conclusion: Addition of p16 and Ki67 immunostains is helpful in the diagnosis and grading of AIN.
Search for stable Strange Quark Matter in lunar soil
Ke Han,Jeffrey Ashenfelter,Alexei Chikanian,William Emmet,Evan Finch,Andreas Heinz,Jes Madsen,Richard Majka,Benjamin Monreal,Jack Sandweiss
Physics , 2009, DOI: 10.1103/PhysRevLett.103.092302
Abstract: We report results from a search for strangelets (small chunks of Strange Quark Matter) in lunar soil using the Yale WNSL accelerator as a mass spectrometer. We have searched over a range in mass from A=42 to A=70 amu for nuclear charges 5, 6, 8, 9, and 11. No strangelets were found in the experiment. For strangelets with nuclear charge 8, a concentration in lunar soil higher than $10^{-16}$ is excluded at the 95% confidence level. The implied limit on the strangelet flux in cosmic rays is the most sensitive to date for the covered range and is relevant to both recent theoretical flux predictions and a strangelet candidate event found by the AMS-01 experiment.
Search for Charged Strange Quark Matter Produced in 11.5 A GeV/c Au + Pb Collisions
E864 Collaboration,T. A. Armstrong,K. N. Barish,S. J. Bennett,A. Chikanian,S. D. Coe,T. M. Cormier,R. Davies,G. DeCataldo,P. Dee,G. E. Diebold,C. B. Dover,P. Fachini,L. E. Finch,N. K. George,N. Giglietto,S. V. Greene,P. Haridas,J. C. Hill,A. S. Hirsch,R. A. Hoversten,H. Z. Huang,B. Kim,B. S. Kumar,T. Lainis,J. G. Lajoie,R. A. Lewis,Q. Li,B. Libby,R. D. Majka,M. G. Munhoz,J. L. Nagle,I. A. Pless,J. K. Pope,N. T. Porile,C. A. Pruneau,M. S. Z. Rabin,A. Raino,J. D. Reid,A. Rimai,F. S. Rotondo,J. Sandweiss,R. P. Scharenberg,A. J. Slaughter,G. A. Smith,P. Spinelli,B. K. Srivastava,M. L. Tincknell,W. S. Toothacker,G. Van Buren,W. K. Wilson,F. K. Wohn,E. J. Wolin,Z. Xu,K. Zhao
Physics , 1997, DOI: 10.1103/PhysRevLett.79.3612
Abstract: We present results of a search for strange quark matter (strangelets) in 11.5 A GeV/c Au+Pb collisions from the 1994 and 1995 runs of experiment E864 at Brookhaven's AGS. We observe no strangelet candidates and set a 90% confidence level upper limit of approximately 3x10**-8 per 10% central interaction for the production of |Z|=1 and |Z|=2 strangelets over a large mass range and with metastable lifetimes of about 50 ns or more. These results place constraints primarily on quark-gluon plasma based production models for strangelets.
El Ni?o Impact on Mollusk Biomineralization–Implications for Trace Element Proxy Reconstructions and the Paleo-Archeological Record
Alberto Pérez-Huerta, Miguel F. Etayo-Cadavid, C. Fred T. Andrus, Teresa E. Jeffries, Clifton Watkins, Shane C. Street, Daniel H. Sandweiss
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0054274
Abstract: Marine macroinvertebrates are ideal sentinel organisms to monitor rapid environmental changes associated with climatic phenomena. These organisms build up protective exoskeletons incrementally by biologically-controlled mineralization, which is deeply rooted in long-term evolutionary processes. Recent studies relating potential rapid environmental fluctuations to climate change, such as ocean acidification, suggest modifications on carbonate biominerals of marine invertebrates. However, the influence of known, and recurrent, climatic events on these biological processes during active mineralization is still insufficiently understood. Analysis of Peruvian cockles from the 1982–83 large magnitude El Ni?o event shows significant alterations of the chemico-structure of carbonate biominerals. Here, we show that bivalves modify the main biomineralization mechanism during the event to continue shell secretion. As a result, magnesium content increases to stabilize amorphous calcium carbonate (ACC), inducing a rise in Mg/Ca unrelated to the associated increase in sea-surface temperature. Analysis of variations in Sr/Ca also suggests that this proxy should not be used in these bivalves to detect the temperature anomaly, while Ba/Ca peaks are recorded in shells in response to an increase in productivity, or dissolved barium in seawater, after the event. Presented data contribute to a better understanding of the effects of abrupt climate change on shell biomineralization, while also offering an alternative view of bivalve elemental proxy reconstructions. Furthermore, biomineralization changes in mollusk shells can be used as a novel potential proxy to provide a more nuanced historical record of El Ni?o and similar rapid environmental change events.
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