Statistical mechanical systems on complete graphs, infinite exchangeability, finite extensions and a discrete finite moment problem

We show that a large collection of statistical mechanical systems with quadratically represented Hamiltonians on the complete graph can be extended to infinite exchangeable processes. This extends a known result for the ferromagnetic Curie--Weiss Ising model and includes as well all ferromagnetic Curie--Weiss Potts and Curie--Weiss Heisenberg models. By de Finetti's theorem, this is equivalent to showing that these probability measures can be expressed as averages of product measures. We provide examples showing that ``ferromagnetism'' is not however in itself sufficient and also study in some detail the Curie--Weiss Ising model with an additional 3-body interaction. Finally, we study the question of how much the antiferromagnetic Curie--Weiss Ising model can be extended. In this direction, we obtain sharp asymptotic results via a solution to a new moment problem. We also obtain a ``formula'' for the extension which is valid in many cases.Comment: Published at http://dx.doi.org/10.1214/009117906000001033 in the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org

Triangle percolation in mean field random graphs -- with PDE

We apply a PDE-based method to deduce the critical time and the size of the giant component of the ``triangle percolation'' on the Erd\H{o}s-R\'enyi random graph process investigated by Palla, Der\'enyi and VicsekComment: Summary of the changes made: We have changed a remark about k-clique percolation in the first paragraph. Two new paragraphs are inserted after equation (4.4) with two applications of the equation. We have changed the names of some variables in our formula

Mineotaur: a tool for high-content microscopy screen sharing and visual analytics

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Laws relating runs, long runs, and steps in gambler's ruin, with persistence in two strata

Define a certain gambler's ruin process \mathbf{X}_{j}, \mbox{ \ }j\ge 0, such that the increments $\varepsilon_{j}:=\mathbf{X}_{j}-\mathbf{X}_{j-1}$ take values $\pm1$ and satisfy $P(\varepsilon_{j+1}=1|\varepsilon_{j}=1, |\mathbf{X}_{j}|=k)=P(\varepsilon_{j+1}=-1|\varepsilon_{j}=-1,|\mathbf{X}_{j}|=k)=a_k$, all $j\ge 1$, where $a_k=a$ if $0\le k\le f-1$, and $a_k=b$ if $f\le k<N$. Here $0<a, b <1$ denote persistence parameters and $f ,N\in \mathbb{N}$ with $f<N$. The process starts at $\mathbf{X}_0=m\in (-N,N)$ and terminates when $|\mathbf{X}_j|=N$. Denote by ${\cal R}'_N$, ${\cal U}'_N$, and ${\cal L}'_N$, respectively, the numbers of runs, long runs, and steps in the meander portion of the gambler's ruin process. Define $X_N:=\left ({\cal L}'_N-\frac{1-a-b}{(1-a)(1-b)}{\cal R}'_N-\frac{1}{(1-a)(1-b)}{\cal U}'_N\right )/N$ and let $f\sim\eta N$ for some $0<\eta <1$. We show $\lim_{N\to\infty} E\{e^{itX_N}\}=\hat{\varphi}(t)$ exists in an explicit form. We obtain a companion theorem for the last visit portion of the gambler's ruin.Comment: Presented at 8th International Conference on Lattice Path Combinatorics, Cal Poly Pomona, Aug., 2015. The 2nd version has been streamlined, with references added, including reference to a companion document with details of calculations via Mathematica. The 3rd version has 2 new figures and improved presentatio

Stability and Convergence of Product Formulas for Operator Matrices

We present easy to verify conditions implying stability estimates for operator matrix splittings which ensure convergence of the associated Trotter, Strang and weighted product formulas. The results are applied to inhomogeneous abstract Cauchy problems and to boundary feedback systems.Comment: to appear in Integral Equations and Operator Theory (ISSN: 1420-8989

First results from 2+1 dynamical quark flavors on an anisotropic lattice: light-hadron spectroscopy and setting the strange-quark mass

We present the first light-hadron spectroscopy on a set of $N_f=2+1$ dynamical, anisotropic lattices. A convenient set of coordinates that parameterize the two-dimensional plane of light and strange-quark masses is introduced. These coordinates are used to extrapolate data obtained at the simulated values of the quark masses to the physical light and strange-quark point. A measurement of the Sommer scale on these ensembles is made, and the performance of the hybrid Monte Carlo algorithm used for generating the ensembles is estimated.Comment: 24 pages. Hadron Spectrum Collaboratio

Piroszénsavdietilészter spektrofotometriás meghatározása

Die Verfasser arbeiteten ein direktes spektrophotometrisch.es analytisches Verfahren zur Bestimmung der Pyrolkohlensäurediäthylesterkonzentration in destilliertem Wasser aus. Sie stelten fest, dass im Absorptions spektrum des Pyrokohlensäurediäthylesters bei 1900 A° eine maximale Absorption auftritt. Die Pyrokohlensäurediäthylesterkonzentrationswerte im Bereich von 0—0,3% weisen einen linearen Zusammenhang mit den Extinktionswerten auf. Es wurde festgestellt, dass die Hydrolyse des Pyrokohlensäurediäthylesters eine Reaktion erster Ordnung ist. Aus den Resultaten der kinetischen Untersuchung des Zersetzungsvorganges wurde der Wert der Zersetzungsgeschwindigkeitskonstante К berechnet,, und auf Grund der Messresultate der Zersetzungsgeschwindigkeit hei 3, 20. 40, 60, 80, 100° 0 der Temperaturkoeffizient (Q10) der Zersetzungsgeschwindigkeit. A direct spectrophotometric analytical method was evolved by the* authors for the determination of the concentration of pyro carbonic acid diethylester in distilled water. They found that in the absorption spectrum of pyrocarbonic acid diethylester maximum absorption appears at 1900 A0 The values of the concentration of pyrocarbonic acid diethylester showed in the region 0—0,3% a linear correlation with extinction Values. The hydrolysis of pyrocarbonic acid diethylester proved to be a reaction of first order. From the results of the kinetical investigation of the decomposition process, the value of the rate constant К of the decomposition process was calculated. Further, the temperature coefficient (Q10) of the decomposition rate was calculated from the data of measurement of the decomposition rate at 3, 20, 40, 60, 80 and 100 °C. Les auteurs ont élaboré une méthode analytique directe spektrophotométrique pour l’estimation de la concentration de Tester diéthylique de Pacidé pyrocarbonique dans de l’eau distillée. Ils ont établi, que dans le spectre d’absorption de Pester diéthylique de Pacidé pyrocarbonique il se présente une absorption maximale a 1900. A°. Les valeurs de concentration de Pester diéthylique de Pacidé pyrocarbonique sont lineares aux valeurs d’extinction dans le domaine de 0—0,3%. Ils ont établi que l’hydrolyse de Pester diéthylique est un processus d°ordre de premiere reaction. Partant des résultats de l’étude cynétique du processus de décomposition ils ont calculé la constante de la vitesse de la décomposition K. Ils ont aussi calculé le coefficient thermique de la vitesse de décomposition en partant des observations faites a 3, 20, 40, 60, 80 et 10 C°