14,941 research outputs found
Late cretaceous extensional tectonics and associated igneous activity on the northern margin of the Gulf of Mexico Basin
Major, dominantly compressional, orogenic episodes (Taconic, Acadian, Alleghenian) affected eastern North America during the Paleozoic. During the Mesozoic, in contrast, this same region was principally affected by epeirogenic and extensional tectonism; one episode of comparatively more intense tectonic activity involving extensive faulting, uplift, sedimentation, intrusion and effusion produced the Newark Series of eposits and fault block phenomena. This event, termed the Palisades Disturbance, took place during the Late Triassic - Earliest Jurassic. The authors document a comparable extensional tectonic-igneous event occurring during the Late Cretaceous (Early Gulfian; Cenomanian-Santonian) along the southern margin of the cratonic platform from Arkansas to Georgia
Analyticity of the SRB measure for a class of simple Anosov flows
We consider perturbations of the Hamiltonian flow associated with the
geodesic flow on a surface of constant negative curvature. We prove that, under
a small perturbation, not necessarely of Hamiltonian character, the SRB measure
associated to the flow exists and is analytic in the strength of the
perturbation. An explicit example of "thermostatted" dissipative dynamics is
constructed.Comment: 23 pages, corrected typo
Optimal fidelity of teleportation of coherent states and entanglement
We study the Braunstein-Kimble protocol for the continuous variable
teleportation of a coherent state. We determine lower and upper bounds for the
optimal fidelity of teleportation, maximized over all local Gaussian operations
for a given entanglement of the two-mode Gaussian state shared by the sender
(Alice) and the receiver (Bob). We also determine the optimal local
transformations at Alice and Bob sites and the corresponding maximum fidelity
when one restricts to local trace-preserving Gaussian completely positive maps.Comment: 10 pages, 2 figure
Evanescent single-molecule biosensing with quantum limited precision
Sensors that are able to detect and track single unlabelled biomolecules are
an important tool both to understand biomolecular dynamics and interactions at
nanoscale, and for medical diagnostics operating at their ultimate detection
limits. Recently, exceptional sensitivity has been achieved using the strongly
enhanced evanescent fields provided by optical microcavities and nano-sized
plasmonic resonators. However, at high field intensities photodamage to the
biological specimen becomes increasingly problematic. Here, we introduce an
optical nanofibre based evanescent biosensor that operates at the fundamental
precision limit introduced by quantisation of light. This allows a four
order-of-magnitude reduction in optical intensity whilst maintaining
state-of-the-art sensitivity. It enable quantum noise limited tracking of
single biomolecules as small as 3.5 nm, and surface-molecule interactions to be
monitored over extended periods. By achieving quantum noise limited precision,
our approach provides a pathway towards quantum-enhanced single-molecule
biosensors.Comment: 17 pages, 4 figures, supplementary informatio
Collisions of boosted black holes: perturbation theory prediction of gravitational radiation
We consider general relativistic Cauchy data representing two nonspinning,
equal-mass black holes boosted toward each other. When the black holes are
close enough to each other and their momentum is sufficiently high, an
encompassing apparent horizon is present so the system can be viewed as a
single, perturbed black hole. We employ gauge-invariant perturbation theory,
and integrate the Zerilli equation to analyze these time-asymmetric data sets
and compute gravitational wave forms and emitted energies. When coupled with a
simple Newtonian analysis of the infall trajectory, we find striking agreement
between the perturbation calculation of emitted energies and the results of
fully general relativistic numerical simulations of time-symmetric initial
data.Comment: 5 pages (RevTex 3.0 with 3 uuencoded figures), CRSR-107
Standard Model Top Quark Asymmetry at the Fermilab Tevatron
Top quark pair production at proton-antiproton colliders is known to exhibit
a forward-backward asymmetry due to higher-order QCD effects. We explore how
this asymmetry might be studied at the Fermilab Tevatron, including how the
asymmetry depends on the kinematics of extra hard partons. We consider results
for top quark pair events with one and two additional hard jets. We further
note that a similar asymmetry, correlated with the presence of jets, arises in
specific models for parton showers in Monte Carlo simulations. We conclude that
the measurement of this asymmetry at the Tevatron will be challenging, but
important both for our understanding of QCD and for our efforts to model it.Comment: 26 p., 10 embedded figs., comment added, version to appear in PR
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Microwave Heating of Lunar Simulants JSC-1A and NU-LHT-3M: Experimental And Theoretical Analysis
Intelligences in Strategic Issues Management: Challenging the Mutually Beneficial Relationships Paradigm
Mutually beneficial relationships (MBRs), a concept used to conceptualize public relations processes and outcomes, has been featured relatively uncritically for many years. This normative concept became an elixir for collective problem solving and shared decision making. Careful consideration of highly contested issues reveals evidence that within-group MBRs can prevent overarching solutions, decisions between issue groups, and can constitute stalemating or hegemonic tribalism. Strategic issues management (SIM) provides decision-making intelligences by which conflict between businesses and other members of society can be understood and resolved. Issue advocates' adversarial strategies can frustrate any society's ability to solve problems and make meaningful decisions, even when parties share a common motivating value. Stalemated public policy interpretations create sores that cannot heal; complex problems cannot be solved. Thus, MBRs are not the promised panacea or even a normative approach. Within-group MBRs can prevent between-group MBRs. An ethically engaged and rhetorically astute SIM process offers a constructive alternative to understanding complex, contested issues and offering informed problem resolution. Relationships do not have to be mutually beneficial to be included within the realm of public relations. In fact, relationships can span a continuum while still warranting and requiring the attentions, expertise, and activities of public relations. As long as ethical standards are maintained, those relationships can exist in whatever form is most intelligent for the handling of issues. In that view, public relations truly joins strategic management
Legislative/judicial interaction: do court ideologies constrain legislative action?
This paper seeks to contribute to our understanding of the degree of success enjoyed by bills in state legislatures. More specifically, we propose a model of bill success that includes a measure of judicial preferences such that we can ascertain the extent to which judicial ideology and perceived judicial climate constrain legislative behavior. We argue that liberal bills are less likely to be enacted in states where the court of last resort is also liberal as opponents will be concerned that the high court will read the legislation too expansively. There is, thus, additional incentive to mobilize to prevent passage of liberal bills in these states
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