626 research outputs found
Colour confinement and dual superconductivity of the vacuum - I
We study dual superconductivity of the ground state of SU(2) gauge theory, in
connection with confinement. We do that measuring on the lattice a disorder
parameter describing condensation of monopoles. Confinement appears as a
transition to dual superconductor, independent of the abelian projection
defining monopoles. Some speculations are made on the existence of a more
appropriate disorder parameter. A similar study for SU(3) is presented in a
companion paper.Comment: Some typos corrected, acknowledgements added; to appear on Phys. Rev.
Reasoning About a Service-oriented Programming Paradigm
This paper is about a new way for programming distributed applications: the
service-oriented one. It is a concept paper based upon our experience in
developing a theory and a language for programming services. Both the
theoretical formalization and the language interpreter showed us the evidence
that a new programming paradigm exists. In this paper we illustrate the basic
features it is characterized by
Conductance tomography of conductive filaments in intrinsic silicon-rich silica RRAM
We present results from an imaging study of filamentary conduction in silicon suboxide resistive RAM devices. We used a conductive atomic force microscope to etch through devices while measuring current, allowing us to produce tomograms of conductive filaments. To our knowledge this is the first report of such measurements in an intrinsic resistance switching material
High Performance Resistance Switching Memory Devices Using Spin-on Silicon Oxide
In this paper, we present high performance resistance switching memory devices (RRAM) with an SiO 2 -like active layer formed from spin-on hydrogen silsesquioxane (HSQ). Our metal-insulator-metal (MIM) devices exhibit switching voltages of less than 1 V, cycling endurances of more than 10 7 cycles without failure, electroforming below 2 V and retention time of resistance states of more than 10 5 seconds at room temperature. We also report arrays of nanoscale HSQ-based RRAM devices in the form of multilayer nanopillars with switching performance comparable to that of our thin film devices. We are able to address and program individual RRAM nanopillars using conductive atomic force microscopy. These promising results, coupled with a much easier fabrication method than traditional ultra-high vacuum based deposition techniques, make HSQ a strong candidate material for the next generation memory devices
A disorder parameter for dual superconductivity in gauge theories
Dual superconductivity in the confining phase of gauge theories is discussed
in terms of a disorder parameter which vanishes in normal phase and is
different from zero in the superconducting phase.Comment: 3 pages, 4 postscript figures, espcrc2, epsfig latex styles,
Contribution to Lat 97 Conference, Edinburg
Monopole Condensation and Color Confinement
New evidence is discussed of monopole condensation in the vacuum of SU(2) and
SU(3) gauge theories. Monopoles defined by different abelian projections do
condense in the transition to the confined phase and show the same behavior.
For SU(2) critical indices are determined by finite size scaling analysis and
the results agree with the 3d Ising Model, as expected.Comment: LATTICE98(confinement),3 pages,4 figure
Old subjects with sepsis in the emergency department: Trend analysis of case fatality rate
Background: The burden of sepsis represents a global health care problem. We aimed to assess the case fatality rate (CFR) and its predictors in subjects with sepsis admitted to a general Italian hospital from 2009 to 2016, stratified by risk score. Methods: We performed a retrospective analysis of all sepsis-related hospitalizations after Emergency Department (ED) visit in a public Italian hospital in an 8-year period. A risk score to predict CFR was computed by logistic regression analysis of selected variables in a training set (2009-2012), and then confirmed in the whole study population. A trend analysis of CFR during the study period was performed dividing patient as high-risk (upper tertile of risk score) or low-risk. Results: Two thousand four hundred ninety-two subjects were included. Over time the incidental admission rate (no. of sepsis-related admissions per 100 total admissions) increased from 4.1% (2009-2010) to 5.4% (2015-2016); P < 0.001, accompanied by a reduced CFR (from 38.0 to 18.4%; P < 0.001). A group of 10 variables (admission to intensive care unit, cardio-vascular dysfunction, HIV infection, diabetes, age 65 80 years, respiratory diseases, number of organ dysfunction, digestive diseases, dementia and cancer) were selected by the logistic model to predict CFR with good accuracy: AUC 0.873 [0.009]. Along the years CFR decreased from 31.8% (2009-2010) to 25.0% (2015-2016); P = 0.007. The relative proportion of subjects 6580 years (overall, 52.9% of cases) and classified as high-risk did not change along the years. CFR decreased only in low-risk subjects (from 13.3 to 5.2%; P < 0.001), and particularly in those aged 6580 (from 18.2 to 6.6%; P = 0.003), but not in high-risk individuals (from 69.9 to 64.2%; P = 0.713). Conclusion: Between 2009 and 2016 the incidence of sepsis-related hospitalization increased in a general Italian hospital, with a downward trend in CFR, only limited to low-risk patients and particularly to subjects 6580 years
The recent history of the Galapagos Triple Junction preserved on the Pacific plate
Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Earth and Planetary Science Letters 371-372 (2013): 6-15, doi:10.1016/j.epsl.2013.04.018.At the Galapagos triple junction, the Cocos and Nazca plates are broken by a succession of
transient rifts north and south of the Cocos-Nazca (C-N) Rift. Modeling has suggested that each
rift initiated at the East Pacific Rise (EPR), its location controlled by the distance of the C-N Rift
tip from the EPR. Evidence on the Pacific plate confirms that each transient rift formed a true
RRR triple junction with the EPR and clarifies the history of the region. At ~1.5 Ma the triple
junctions began jumping rapidly toward C-N Rift suggesting that the C-N Rift tip moved closer
to the EPR. Pacific abyssal hills became broad and shallow indicating enhanced magma supply
to the region. At ~1.4 Ma, the Galapagos microplate developed when extension became fixed on
the southern transient rift to form the South scarp of the future Dietz rift basin. Lavas flooded the
area and a Galapagos-Nazca magmatic spreading center initiated at the EPR. We suggest that a
hotspot was approaching the southern triple junction from the west. The hotspot crossed to the
Nazca plate ~1.25 Ma. Dietz seamount formed within the young spreading center, dikes intruded
Dietz rift basin, and eruptions built volcanic ridges. Since ~0.8 Ma magmatic spreading has
jumped northward twice, most recently to Dietz volcanic ridge. Amagmatic extension to the east
has formed the large North scarp of Dietz rift basin. Northward jumping of the southern triple
junction has maintained the microplate boundary close to the proposed hotspot.DKS was partially supported by NSF grant OCE-1028537, WZ by
NSF grant EAR-1056317, and LM by NSF grant OCE-1060878
Surface Phenomena Enhancing the Antibacterial and Osteogenic Ability of Nanocrystalline Hydroxyapatite, Activated by Multiple-Ion Doping
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