Resonance and frequency-locking phenomena in spatially extended phytoplankton-zooplankton system with additive noise and periodic forces

In this paper, we present a spatial version of phytoplankton-zooplankton model that includes some important factors such as external periodic forces, noise, and diffusion processes. The spatially extended phytoplankton-zooplankton system is from the original study by Scheffer [M Scheffer, Fish and nutrients interplay determines algal biomass: a minimal model, Oikos \textbf{62} (1991) 271-282]. Our results show that the spatially extended system exhibit a resonant patterns and frequency-locking phenomena. The system also shows that the noise and the external periodic forces play a constructive role in the Scheffer's model: first, the noise can enhance the oscillation of phytoplankton species' density and format a large clusters in the space when the noise intensity is within certain interval. Second, the external periodic forces can induce 4:1 and 1:1 frequency-locking and spatially homogeneous oscillation phenomena to appear. Finally, the resonant patterns are observed in the system when the spatial noises and external periodic forces are both turned on. Moreover, we found that the 4:1 frequency-locking transform into 1:1 frequency-locking when the noise intensity increased. In addition to elucidating our results outside the domain of Turing instability, we provide further analysis of Turing linear stability with the help of the numerical calculation by using the Maple software. Significantly, oscillations are enhanced in the system when the noise term presents. These results indicate that the oceanic plankton bloom may partly due to interplay between the stochastic factors and external forces instead of deterministic factors. These results also may help us to understand the effects arising from undeniable subject to random fluctuations in oceanic plankton bloom.Comment: Some typos errors are proof, and some strong relate references are adde

Efficient Passive ICS Device Discovery and Identification by MAC Address Correlation

Owing to a growing number of attacks, the assessment of Industrial Control Systems (ICSs) has gained in importance. An integral part of an assessment is the creation of a detailed inventory of all connected devices, enabling vulnerability evaluations. For this purpose, scans of networks are crucial. Active scanning, which generates irregular traffic, is a method to get an overview of connected and active devices. Since such additional traffic may lead to an unexpected behavior of devices, active scanning methods should be avoided in critical infrastructure networks. In such cases, passive network monitoring offers an alternative, which is often used in conjunction with complex deep-packet inspection techniques. There are very few publications on lightweight passive scanning methodologies for industrial networks. In this paper, we propose a lightweight passive network monitoring technique using an efficient Media Access Control (MAC) address-based identification of industrial devices. Based on an incomplete set of known MAC address to device associations, the presented method can guess correct device and vendor information. Proving the feasibility of the method, an implementation is also introduced and evaluated regarding its efficiency. The feasibility of predicting a specific device/vendor combination is demonstrated by having similar devices in the database. In our ICS testbed, we reached a host discovery rate of 100% at an identification rate of more than 66%, outperforming the results of existing tools.Comment: http://dx.doi.org/10.14236/ewic/ICS2018.

Measurements of the Cross Section for e+e- -> hadrons at Center-of-Mass Energies from 2 to 5 GeV

We report values of $R = \sigma(e^+e^-\to {hadrons})/\sigma(e^+e^-\to\mu^+\mu^-)$ for 85 center-of-mass energies between 2 and 5 GeV measured with the upgraded Beijing Spectrometer at the Beijing Electron-Positron Collider.Comment: 5 pages, 3 figure

First Measurement of the Branching Fraction of the Decay psi(2S) --> tau tau

The branching fraction of the psi(2S) decay into tau pair has been measured for the first time using the BES detector at the Beijing Electron-Positron Collider. The result is $B_{\tau\tau}=(2.71\pm 0.43 \pm 0.55) \times 10^{-3}$, where the first error is statistical and the second is systematic. This value, along with those for the branching fractions into e+e- and mu+mu of this resonance, satisfy well the relation predicted by the sequential lepton hypothesis. Combining all these values with the leptonic width of the resonance the total width of the psi(2S) is determined to be $(252 \pm 37)$ keV.Comment: 9 pages, 2 figure

Measurement of the Inclusive Charm Cross Section at 4.03 GeV and 4.14 GeV

The cross section for charmed meson production at $\sqrt{s} = 4.03$ and 4.14 GeV has been measured with the Beijing Spectrometer. The measurement was made using 22.3 $pb^{-1}$ of $e^+e^-$ data collected at 4.03 GeV and 1.5 $pb^{-1}$ of $e^+e^-$ data collected at 4.14 GeV. Inclusive observed cross sections for the production of charged and neutral D mesons and momentum spectra are presented. Observed cross sections were radiatively corrected to obtain tree level cross sections. Measurements of the total hadronic cross section are obtained from the charmed meson cross section and an extrapolation of results from below the charm threshold.Comment: 11 pages, 13 figures. The top level tex file is paper.tex. It builds the paper from other tex files in this .tar and the .eps file

Observation of a New Charmed Strange Meson

Using the CLEO-II detector, we have obtained evidence for a new meson decaying to $D^0 K^+$. Its mass is $2573.2^{+1.7}_{-1.6}\pm 0.8\pm 0.5$ {}~MeV/$c^2$ and its width is $16^{+5}_{-4}\pm 3$~MeV/$c^2$. Although we do not establish its spin and parity, the new meson is consistent with predictions for an $L=1$, $S=1$, $J_P=2^+$ charmed strange state.Comment: 9 pages uuencoded compressed postscript (process with uudecode then gunzip). hardcopies with figures can be obtained by sending mail to: [email protected]

Measurement of the Total Cross Section for Hadronic Production by e+e- Annihilation at Energies between 2.6-5 Gev

Using the upgraded Beijing Spectrometer (BESII), we have measured the total cross section for $e^+e^-$ annihilation into hadronic final states at center-of-mass energies of 2.6, 3.2, 3.4, 3.55, 4.6 and 5.0 GeV. Values of $R$, $\sigma(e^+e^-\to {hadrons})/\sigma(e^+e^-\to\mu^+\mu^-)$, are determined.Comment: Submitted to Phys. Rev. Let

À quoi ressemble une approche de compétence culturelle dans les soins de santé mentale pour de jeunes autochtones du Nouveau-Brunswick?

Le besoin de soutien en santé mentale est criant chez les jeunes autochtones, pour qui les services sont inadéquats et peu accessibles (Boska et al., 2015; Kirmayer et al., 2000). En fait, plus de 50 % des jeunes autochtones âgés de 15 et 25 ans sont atteints de troubles de santé mentale au cours de leur vie, et le risque de tentatives de suicide est trois fois plus élevé chez les jeunes autochtones que chez les non-Autochtones (Dezetter et al., 2016). De plus, chez les jeunes autochtones, le minimum de soins adéquats pour traiter la dépression et l’anxiété n’est atteint que dans 28,3 % et 50,3 % des cas respectivement, de sorte que 9,5 % d’entre eux rapportent que leurs besoins en santé mentale ne sont pas comblés (Dezetter et al., 2016). Les populations autochtones ne font pas confiance aux professionnels de la santé, ils sont intimidés par l’approche occidentale des soins, et la peur d’être victimes de racisme et d’aliénation limite leur accès aux services comparativement aux non-Autochtones (Conseil canadien de la santé, 2012). Sans les soins et les ressources appropriés, les Autochtones risquent de recevoir un diagnostic tardif, de même qu’un pronostic moins encourageant, en plus de passer à côté des mesures préventives comme les tests de dépistage (Conseil canadien de la santé, 2012). Pour pallier les lacunes dans les soins de santé mentale, la compétence culturelle a été reconnue dans le système de santé comme une approche adaptée aux besoins culturels spécifiques de cette population minoritaire (Churchill et al., 2017; Conseil canadien de la santé, 2012). Cependant, les définitions de la compétence ne font pas consensus dans la littérature. De nombreux modèles cliniques ont été élaborés et évalués, mais les résultats d’études sont mitigés et les résultats ne sont pas probants pour ce qui est de l’influence de ces mesures proposées sur la réalité des jeunes autochtones. Le but de cette étude est de mieux comprendre la perspective des jeunes autochtones d’une région rurale et anglophone du Nouveau-Brunswick en matière de soins de santé mentale et de déterminer en quoi consiste une approche de compétence culturelle spécifique à ces jeunes. Des groupes de discussion ont été menés auprès de 12 jeunes des Premières Nations afin de discuter de leur parcours dans les soins de santé mentale, tout en saisissant ce qu’ils perçoivent comme étant aidant ou non dans les services offerts. Des intervenants de la communauté ont aussi été consultés afin de bien comprendre les enjeux soulevés par les jeunes. L’analyse qualitative des discussions met en évidence les lacunes dans les soins existants dans la province, ainsi que les aspects qui sont recherchés par les jeunes autochtones-----c’est-à-dire le contrôle sur leur gestion émotionnelle, la continuité de soins, la compétence, la confidentialité, ainsi que l’intégration de pratiques culturelles. Le discours des jeunes révèle que la compétence culturelle est insuffisante pour combler leurs besoins, et que la sécurité culturelle doit dorénavant être au cœur des services de santé mentale. Les implications théoriques et cliniques d’un modèle de sécurité culturelle sont discutées et des pistes de recherches futures sont proposées

Precision Measurement of the Ds∗+−Ds+D_s^{*+}- D_s^+ Mass Difference

We have measured the vector-pseudoscalar mass splitting $M(D_s^{*+})-M(D_s^+) = 144.22\pm 0.47\pm 0.37 MeV$, significantly more precise than the previous world average. We minimize the systematic errors by also measuring the vector-pseudoscalar mass difference $M(D^{*0})-M(D^0)$ using the radiative decay $D^{*0}\rightarrow D^0\gamma$, obtaining $[M(D_s^{*+})-M(D_s^+)]-[M(D^{*0})-M(D^0)] = 2.09\pm 0.47\pm 0.37 MeV$. This is then combined with our previous high-precision measurement of $M(D^{*0})-M(D^0)$, which used the decay $D^{*0}\rightarrow D^0\pi^0$. We also measure the mass difference $M(D_s^+)-M(D^+)=99.5\pm 0.6\pm 0.3$ MeV, using the $\phi\pi^+$ decay modes of the $D_s^+$ and $D^+$ mesons.Comment: 18 pages uuencoded compressed postscript (process with uudecode then gunzip). hardcopies with figures can be obtained by sending mail to: [email protected]