1,005 research outputs found
Remote MIB-item look-up service
Despite some deficiencies, the Internet management framework is widely deployed and thousands of management information base (MIB) modules have been defined thus far. These modules are used by implementers of agent software, as well as by managers and management applications, to understand the syntax and semantics of the management information that may be exchanged. At the manager's side, MIB modules are usually stored in separate files, which are maintained by the human manager and read by the management application. Since maintenance of this file repository can be cumbersome, management applications are often confronted with incomplete and outdated information. To solve this "meta-management" problem, this paper discusses the design of a remote look-up service for MIB-item definitions. Such a service facilitates the retrieval of missing MIB module definitions, as well as definitions of individual MIB-items. Initially the service may be provided by a single server, but other servers can be added at later stages to improve performance and prevent copyright problems. It is envisaged that vendors of network equipment will also install servers, to distribute their vendor specific MIB. The paper describes how the service, which is provided on a best effort basis, can be accessed by managers/management applications, and how servers inform each other about the MIB modules they support
The smallest bimolecular mass action reaction networks admitting AndronovâHopf bifurcation
We address the question of which small, bimolecular, mass action chemical reaction networks (CRNs) are capable of AndronovâHopf bifurcation (from here on abbreviated to âHopf bifurcationâ). It is easily shown that any such network must have at least three species and at least four irreversible reactions, and one example of such a network with exactly three species and four reactions was previously known due to Wilhelm. In this paper, we develop both theory and computational tools to fully classify three-species, four-reaction, bimolecular CRNs, according to whether they admit or forbid Hopf bifurcation. We show that there are, up to a natural equivalence, 86 minimal networks which admit nondegenerate Hopf bifurcation. Amongst these, we are able to decide which admit supercritical and subcritical bifurcations. Indeed, there are 25 networks which admit both supercritical and subcritical bifurcations, and we can confirm that all 25 admit a nondegenerate Bautin bifurcation. A total of 31 networks can admit more than one nondegenerate periodic orbit. Moreover, 29 of these networks admit the coexistence of a stable equilibrium with a stable periodic orbit. Thus, fairly complex behaviours are not very rare in these small, bimolecular networks. Finally, we can use previously developed theory on the inheritance of dynamical behaviours in CRNs to predict the occurrence of Hopf bifurcation in larger networks which include the networks we find here as subnetworks in a natural sense
The smallest bimolecular mass-action system with a vertical AndronovâHopf bifurcation
We present a three-dimensional differential equation, which robustly displays a degenerate AndronovâHopf bifurcation of infinite codimension, leading to a center, i.e., an invariant two-dimensional surface that is filled with periodic orbits surrounding an equilibrium. The system arises from a three-species bimolecular chemical reaction network consisting of four reactions. In fact, it is the only such mass-action system that admits a center via an AndronovâHopf bifurcation
A COMPUTER PROGRAM FOR SIMULATING SOME SIGNAL-TO-NOISE ENHANCEMENT METHODS USED IN HIGH PERFORMANCE INSTRUMENTS
A computer program for a personal computer was written to test seven noise filtering
methods with simulated signals buried in noise for education. The methods tested were as
follows: filtering by an RC network, accumulation, sampling with integration, smoothing by
Savitzky-Golay filter, combination of accumulation and Savitzky-Golay smoothing, combination
of integral sampling and Savitzky-Golay smoothing and filtering by Fourier
transformation. The two combined methods have yielded the best results
When are fish sources versus sinks of nutrients in lake ecosystems?
Animals can be important in nutrient cycling through a variety of direct and
indirect pathways. A high biomass of animals often represents a large pool of nutrients,
leading some ecologists to argue that animal assemblages can represent nutrient sinks within
ecosystems. The role of animals as sources vs. sinks of nutrients has been debated particularly
extensively for freshwater ïŹshes. We argue that a large pool size does not equate to a nutrient
sink; rather, animals can be nutrient sinks when their biomass increases, when emigration rates
are high, and/or when nutrients in animal carcasses are not remineralized. To further explore
these ideas, we use a simple model to evaluate the conditions under which ïŹsh are phosphorus
(P) sources or sinks at the ecosystem (lake) level, and at the habitat level (benthic and water
column habitats). Our simulations suggest that, under most conditions, ïŹsh are sinks for
benthic P but are net P sources to the water column. However, P source and sink strengths
depend on ïŹsh feeding habits (proportion of P consumed from the benthos and water
column), migration patterns, and especially the fate of carcass P. Of particular importance is
the rate at which carcasses are mineralized and the relative importance of benthic vs. pelagic
primary producers in taking up mineralized P (and excreted P). Higher proportional uptake of
P by benthic primary producers increases the likelihood that ïŹsh are sinks for water column P.
Carcass bones and scales are relatively recalcitrant and can represent a P sink even if ïŹsh
biomass does not change over time. Thus, there is a need for better documentation of the
fraction of carcass P that is remineralized, and the fate of this P, under natural conditions. We
urge a more holistic perspective regarding the role of animals in nutrient cycling, with a focus
on quantifying the rates at which animals consume, store, release, and transport nutrients
under various conditions
Lambda Polarization in Polarized Proton-Proton Collisions at RHIC
We discuss Lambda polarization in semi-inclusive proton-proton collisions,
with one of the protons longitudinally polarized. The hyperfine interaction
responsible for the - and - mass splittings gives
rise to flavor asymmetric fragmentation functions and to sizable polarized
non-strange fragmentation functions. We predict large positive Lambda
polarization in polarized proton-proton collisions at large rapidities of the
produced Lambda, while other models, based on SU(3) flavor symmetric
fragmentation functions, predict zero or negative Lambda polarization. The
effect of and decays is also discussed. Forthcoming
experiments at RHIC will be able to differentiate between these predictions.Comment: 18 pages, 5 figure
Metabolic sensitivity of pancreatic tumour cell apoptosis to glycogen phosphorylase inhibitor treatment
Inhibitors of glycogen breakdown regulate glucose homeostasis by limiting glucose production in diabetes. Here we demonstrate that restrained glycogen breakdown also inhibits cancer cell proliferation and induces apoptosis through limiting glucose oxidation, as well as nucleic acid and de novo fatty acid synthesis. Increasing doses (50-100 microM) of the glycogen phosphorylase inhibitor CP-320626 inhibited [1,2-(13)C(2)]glucose stable isotope substrate re-distribution among glycolysis, pentose and de novo fatty acid synthesis in MIA pancreatic adenocarcinoma cells. Limited oxidative pentose-phosphate synthesis, glucose contribution to acetyl CoA and de novo fatty acid synthesis closely correlated with decreased cell proliferation. The stable isotope-based dynamic metabolic profile of MIA cells indicated a significant dose-dependent decrease in macromolecule synthesis, which was detected at lower drug doses and before the appearance of apoptosis markers. Normal fibroblasts (CRL-1501) did not show morphological or metabolic signs of apoptosis likely due to their slow rate of growth and metabolic activity. This indicates that limiting carbon re-cycling and rapid substrate mobilisation from glycogen may be an effective and selective target site for new drug development in rapidly dividing cancer cells. In conclusion, pancreatic cancer cell growth arrest and death are closely associated with a characteristic decrease in glycogen breakdown and glucose carbon re-distribution towards RNA/DNA and fatty acids during CP-320626 treatment
Quark Distributions of Octet Baryons from SU(3) Symmetry
SU(3) symmetry relations between the octet baryons are introduced in order to
connect both the unpolarized and polarized quark distributions of the octet
baryons with those of the nucleon. Two different parametrizations of the
nucleon quark distributions are used. A new scenario of quark flavor and spin
structure of the is found and compared with two other models: a
perturbative QCD based analysis and a quark diquark model. The and
quarks inside the are predicted to be positively polarized at large
Bjorken variable in the new scenario. By using an approximate relation
connecting the quark fragmentation functions with the quark distributions, the
hadron polarizations of the octet baryons in -annihilation, polarized
charged lepton deep inelastic scattering (DIS) processes, and neutrino
(antineutrino) DIS processes are predicted. The predictions for
polarizations in several processes are compatible with the available data at
large fragmentation momentum fraction , and support the prediction of
positively polarized and quarks inside the at large .
Predictions for Drell-Yan processes from and beams on an
isoscalar target are also given and discussed.Comment: 29 latex pages, 16 figures, to appear in PR
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