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Wisconsin Manuscripts Collection
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by Wisconsin Historical Society
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A collection of websites created by or related to the subjects of Wisconsin manuscript collections held by the Wisconsin Historical Society's Library-Archives and other websites about other subjects of interest to Wisconsin.
Flooved
by David Lippman;Jeff Eldridge;Mike Kenyon;Lawrence Morales;Melonie Rasmussen
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Topics: Maths, Mathematics
Source: http://www.flooved.com/reader/3501
Flooved
by Peter M. Neumann
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These notes are intended as a rough guide to the eight-lecture course Introduction to Pure Mathematics which is a part of the Oxford 1st-year undergraduate course for the Preliminary Examination in Mathematics. Please do not expect a polished account. They are my personal lecture notes, not a carefully checked textbook. Nevertheless, I hope they may be of some help.
Topic: Maths
Source: http://www.flooved.com/reader/1056
Arxiv.org
by Ankur Sinha; Pekka Malo; Timo Kuosmanen
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Variable selection is recognized as one of the most critical steps in statistical modeling. The problems encountered in engineering and social sciences are commonly characterized by over-abundance of explanatory variables, non-linearities and unknown interdependencies between the regressors. An added difficulty is that the analysts may have little or no prior knowledge on the relative importance of the variables. To provide a robust method for model selection, this paper introduces a technique...
Source: http://arxiv.org/abs/1203.6276v2
Arxiv.org
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In a seminal paper of 2005, Nualart and Peccati discovered a surprising central limit theorem (called the "Fourth Moment Theorem" in the sequel) for sequences of multiple stochastic integrals of a fixed order: in this context, convergence in distribution to the standard normal law is equivalent to convergence of just the fourth moment. Shortly afterwards, Peccati and Tudor gave a multidimensional version of this characterization. Since the publication of these two beautiful papers,...
Source: http://arxiv.org/abs/1203.4147v3
Flooved
by Peter Ouwehand
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These notes are for a short course in set theory at the undergraduate level at Stellenbosch University. No pretense at orignality is claimed. Though ampli�ed by material from a number of additional sources, the debt to the �rst few chapters of the book Set Theory, by Thomas Jech, Springer 2003, should be easily discernible.
Topics: Maths, Logic, Numbers and Set Theory, Set Theory, Mathematics
Source: http://www.flooved.com/reader/3368
Arxiv.org
by Yongji Wang; Xiaofeng Liao; Hu Wu; Jingzheng Wu
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Recommender systems require their recommendation algorithms to be accurate, scalable and should handle very sparse training data which keep changing over time. Inspired by ant colony optimization, we propose a novel collaborative filtering scheme: Ant Collaborative Filtering that enjoys those favorable characteristics above mentioned. With the mechanism of pheromone transmission between users and items, our method can pinpoint most relative users and items even in face of the sparsity problem....
Source: http://arxiv.org/abs/1203.5415v1
Internet Archive Presents
by Internet Archive
movies

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Internet Archive meeting to consider TV news research service experiment May 25, 2012 Internet Archive, 300 Funston Ave. San Francisco, CA 94118 Schedule 8:00 a.m. continental breakfast 9:00 a.m. welcoming remarks and tour of Internet Archive 10:00 a.m. participant 5-minute presentations of compelling uses cases 12:30 p.m. lunch 1:30 p.m. remaining presentations consideration of value propositions and compelling use cases 2:30 p.m. topic-specific break-out groups discussions 3:30 p.m....
Topics: television news, newscast, research, Internet Archive, Brewster Kahle, Roger Macdonald, Alexis...
Arxiv.org
by Hiroshi Miki; Satoshi Tsujimoto; Luc Vinet; Alexei Zhedanov
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Quantum state transfer in a triangular domain of a two-dimensional, equally-spaced, spin lat- tice with non-homogeneous nearest-neighbor couplings is analyzed. An exact solution of the one- excitation dynamics is provided in terms of 2-variable Krawtchouk orthogonal polynomials that have been recently defined. The probability amplitude for an excitation to transit from one site to another is given. For some values of the parameters, perfect transfer is shown to take place from the apex of the...
Source: http://arxiv.org/abs/1203.2128v2
Arxiv.org
by Andreas U. Schmidt; Andreas Leicher; Yogendra Shah; Inhyok Cha
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The establishment of trust relationships to a computing platform relies on validation processes. Validation allows an external entity to build trust in the expected behaviour of the platform based on provided evidence of the platform's configuration. In a process like remote attestation, the 'trusted' platform submits verification data created during a start up process. These data consist of hardware-protected values of platform configuration registers, containing nested measurement values,...
Source: http://arxiv.org/abs/1007.0642v4
The collisional rates associated with the isotropic velocity moments $$ and the anisotropic moments $$ and $$ are exactly derived in the case of the inelastic Maxwell model as functions of the exponent $r$, the coefficient of restitution $\alpha$, and the dimensionality $d$. The results are applied to the evolution of the moments in the homogeneous free cooling state. It is found that, at a given value of $\alpha$, not only the isotropic moments of a degree higher than a certain value diverge...
Source: http://arxiv.org/abs/1107.0280v3
Arxiv.org
by Axel Brandenburg; Koen Kemel; Nathan Kleeorin; Igor Rogachevskii
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To understand the basic mechanism of the formation of magnetic flux concentrations, we determine by direct numerical simulations the turbulence contributions to the mean magnetic pressure in a strongly stratified isothermal layer with large plasma beta, where a weak uniform horizontal mean magnetic field is applied. The negative contribution of turbulence to the effective mean magnetic pressure is determined for strongly stratified forced turbulence over a range of values of magnetic Reynolds...
Source: http://arxiv.org/abs/1005.5700v4
Arxiv.org
by L. Jilkova; G. Carraro; B. Jungwiert; I. Minchev
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NGC 6791 is a unique stellar system among Galactic open clusters being at the same time one of the oldest open clusters and the most metal rich. Combination of its properties is puzzling and poses question of its origin. One possible scenario is that the cluster formed close to the Galactic Center and later migrated outwards to its current location. In this work we study the cluster's orbit and investigate the possible migration processes which might have displaced NGC 6791 to its present-day...
Source: http://arxiv.org/abs/1203.0546v2
Arxiv.org
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Motivated by recent observations of non-zero $\theta_{13}$ from the Daya Bay and RENO experiments, we propose a renormalizable neutrino model with $A_4$ discrete symmetry accounting for deviations from the tri-bimaximal mixing pattern of neutrino mixing matrix indicated by neutrino oscillation data. In the model, the light neutrino masses can be generated by radiative corrections, and we show how the light neutrino mass matrix can be diagonalized by the Pontecorvo-Maki-Nakagawa-Sakata mixing...
Source: http://arxiv.org/abs/1203.4185v3
Arxiv.org
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We study the asymptotic behavior of a diffusion process with small diffusion in a domain $D$. This process is reflected at $\partial D$ with respect to a co-normal direction pointing inside $D$. Our asymptotic result is used to study the long time behavior of the solution of the corresponding parabolic PDE with Neumann boundary condition.
Source: http://arxiv.org/abs/1203.5092v2
Arxiv.org
by Tanmoy Bhattacharya; Rajan Gupta; Anosh Joseph; Huey-Wen Lin; Saul D. Cohen
texts

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The standard model weak interactions can be described by four-fermion V-A operators at low energies. New physics at the TeV scale can, however, generate the other Lorentz structures. In this talk, we review the constraints on such interactions from nuclear and hadronic decays, as well as from collider searches. Currently the most stringent bounds come from the analysis of the 0+ to 0+ nuclear and the pi to e nu gamma radiative pion decays. In the near future, the ultracold neutron beta decay...
Source: http://arxiv.org/abs/1203.6843v1
Arxiv.org
by Pierre-Emmanuel Caprace; Nicolas Monod
texts

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Consider a proper cocompact CAT(0) space X. We give a complete algebraic characterisation of amenable groups of isometries of X. For amenable discrete subgroups, an even narrower description is derived, implying Q-linearity in the torsion-free case. We establish Levi decompositions for stabilisers of points at infinity of X, generalising the case of linear algebraic groups to Is(X). A geometric counterpart of this sheds light on the refined bordification of X (\`a la Karpelevich) and leads to a...
Source: http://arxiv.org/abs/1203.1058v1
Flooved
by Barbara Illowsky;Susan Dean
texts

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The textbook was developed over several years and has been used in regular and honors-level classroom settings and in distance learning classes. This textbook is intended for introductory statistics courses being taken by students at two� and four�year colleges who are majoring in fields other than math or engineering. Intermediate algebra is the only prerequisite. The book focuses on applications of statistical knowledge rather than the theory behind it.
Topics: Maths, Mathematics
Source: http://www.flooved.com/reader/3483
Arxiv.org
by Simon Barthelmé; Nicolas Chopin
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Many models of interest in the natural and social sciences have no closed-form likelihood function, which means that they cannot be treated using the usual techniques of statistical inference. In the case where such models can be efficiently simulated, Bayesian inference is still possible thanks to the Approximate Bayesian Computation (ABC) algorithm. Although many refinements have been suggested, ABC inference is still far from routine. ABC is often excruciatingly slow due to very low...
Source: http://arxiv.org/abs/1107.5959v2
Arxiv.org
texts

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We study C*-algebras associated with subsemigroups of groups. For a large class of such semigroups including positive cones in quasi-lattice ordered groups and left Ore semigroups, we describe the corresponding semigroup C*-algebras as C*-algebras of inverse semigroups, groupoid C*-algebras and full corners in associated group crossed products. These descriptions allow us to characterize nuclearity of semigroup C*-algebras in terms of faithfulness of left regular representations and amenability...
Source: http://arxiv.org/abs/1203.0021v2
Arxiv.org
texts

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In this paper, an analytical method that solves the forward displacement problem of several common spherical parallel manipulators (SPMs) is presented. The method uses the the quaternion algebra to restate the problem as a system of four quadrics in four variables and uses an algebraic geometry result by Dixon from 1908 to solve. In addition, a case study is presented for a specific SPM.
Source: http://arxiv.org/abs/1203.6023v1
Arxiv.org
by Arash Azarfar; Jean-François Frigon; Brunilde Sansò
texts

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The popularity of opportunistic spectrum access (OSA), implemented by cognitive radios (CRs), necessitates that these networks should be able to provide service differentiation for different classes of traffic. One of the classic schemes for such a goal is through priority queueing. As link interruptions in OSA networks are frequent, we discuss in this paper four priority queueing disciplines in the presence of interruptions: preemptive-resume, non-preemptive, exceptional non-preemptive and...
Source: http://arxiv.org/abs/1203.6413v1
Arxiv.org
by Hao Wang; Jerome P. Reiter
texts

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When releasing data to the public, data stewards are ethically and often legally obligated to protect the confidentiality of data subjects' identities and sensitive attributes. They also strive to release data that are informative for a wide range of secondary analyses. Achieving both objectives is particularly challenging when data stewards seek to release highly resolved geographical information. We present an approach for protecting the confidentiality of data with geographic identifiers...
Source: http://arxiv.org/abs/1203.4122v1
Arxiv.org
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Graphene can at present be grown at large quantities only by the chemical vapor deposition method, which produces polycrystalline samples. Here, we describe a method for constructing realistic polycrystalline graphene samples for atomistic simulations, and apply it for studying their mechanical properties. We show that cracks initiate at points where grain boundaries meet and then propagate through grains predominantly in zigzag or armchair directions, in agreement with recent experimental...
Source: http://arxiv.org/abs/1203.4196v3
Community Texts
by Stephen Mason
texts

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Stephen Mason is a leading authority on electronic signatures and electronic evidence, having advised global corporations and governments on these topics. He is also the founder and editor of the international open source journal the Digital Evidence and Electronic Signature Law Review . Stephen is an Associate Research Fellow at the IALS. This fourth edition of the well-established practitioner text sets out what constitutes an electronic signature; the form an electronic signature can take;...
Topic: electronic signature
Flooved
by Prof. Joseph Fields
texts

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f(x). However, many of the functions of importance both within mathematics itself as
Topics: Maths, Mathematics
Source: http://www.flooved.com/reader/3477
We study two initial value problems of the linear diffusion equation and a nonlinear diffusion equation, when Cauchy data are bounded and oscillate mildly. The latter nonlinear heat equation is the equation of the curvature flow, when the moving curves are represented by graphs. By using an elementary scaling technique, we show some formulas for space-time behavior of the solution. Keywords: scaling argument, self-similar solution, nonstabilizing solution, nontrivial dynamics, nontrivial...
Source: http://arxiv.org/abs/1203.4315v1
Arxiv.org
by Karen L. Collins; Ann Trenk
texts

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Nordhaus and Gaddum proved, for any graph G, that the chromatic number of G plus the chromatic number of G complement is less than or equal to the number of vertices in G plus 1. Finck characterized the class of graphs that satisfy equality in this bound. In this paper, we provide a new characterization of this class of graphs, based on vertex degrees, which yields a new polynomial-time recognition algorithm and efficient computation of the chromatic number of graphs in this class. Our...
Source: http://arxiv.org/abs/1203.5765v1
Arxiv.org
by Paul Gassiat; Fausto Gozzi; Huyên Pham
texts

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We consider an illiquid financial market with different regimes modeled by a continuous-time finite-state Markov chain. The investor can trade a stock only at the discrete arrival times of a Cox process with intensity depending on the market regime. Moreover, the risky asset price is subject to liquidity shocks, which change its rate of return and volatility, and induce jumps on its dynamics. In this setting, we study the problem of an economic agent optimizing her expected utility from...
Source: http://arxiv.org/abs/1107.4210v2
Arxiv.org
texts

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We prove a structure theorem for topologically recurrent real skew product extensions of distal minimal compact metric flows with a compactly generated Abelian acting group (e.g. $\Z^d$-flows and $\R^d$-flows). The main result states that every such extension apart from a coboundary can be represented by a perturbation of a so-called Rokhlin skew product. We obtain as a corollary that the topological ergodic decomposition of the skew product extension into prolongations is continuous and...
Source: http://arxiv.org/abs/1005.1221v2
Arxiv.org
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Given a divisor $D$ on a tropical curve $\Gamma$, we show that reduced divisors define an integral affine map from the tropical curve to the complete linear system $|D|$. This is done by providing an explicit description of the behavior of reduced divisors under infinitesimal modifications of the base point. We consider the cases where the reduced-divisor map defines an embedding of the curve into the linear system, and in this way, classify all the tropical curves with a very ample canonical...
Source: http://arxiv.org/abs/1007.5364v2
Arxiv.org
by T. Le Bertre; L. D. Matthews; E. Gérard; Y. Libert
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We report the detection of the HI line at 21 cm in the direction of alpha Ori with the Nancay Radiotelescope and with the Very Large Array. The observations confirm the previous detection of HI emission centered on alpha Ori, but additionally reveal for the first time a quasi-stationary detached shell of neutral atomic hydrogen ~4 arcmin. in diameter (0.24 pc at a distance of 200 pc). The detached shell appears elongated in a direction opposite to the star's space motion. A simple model shows...
Source: http://arxiv.org/abs/1203.0255v1
Arxiv.org
by E. Chmielewska; M. Tomczak
texts

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We present the results of the first attempt of statistical research devoted to the association between X-ray Plasma Ejections (XPEs) and prominences. For this aim, we compared contents of a catalogue of XPEs, observed by the Soft X-ray Telescope onboard Yohkoh, to H$\alpha$ reports from the Solar-Geophysical Data. We found that only less than one third of XPEs shows a low-temperature counterpart. A modest connection between hot and cool plasma motions in the corona is also supported by by a...
Source: http://arxiv.org/abs/1203.0783v1
Arxiv.org
by Eliyahu Osherovich; Michael Zibulevsky; Irad Yavneh
texts

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In this work we develop an algorithm for signal reconstruction from the magnitude of its Fourier transform in a situation where some (non-zero) parts of the sought signal are known. Although our method does not assume that the known part comprises the boundary of the sought signal, this is often the case in microscopy: a specimen is placed inside a known mask, which can be thought of as a known light source that surrounds the unknown signal. Therefore, in the past, several algorithms were...
Source: http://arxiv.org/abs/1203.0879v1
Arxiv.org
by A. A. Grinyuk; H. Jung; G. I. Lykasov; A. V. Lipatov; N. P. Zotov
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We found the parameterization of the unintegrated gluon distribution from the best description of the LHC data on the inclusive spectra of hadrons produced in $pp$ collisions at the mid-rapidity region and small transverse momenta. It is different from the one obtained within perturbative QCD only at low intrinsic transverse momenta $k_t$. The application of this distribution to analysis of the $e-p$ DIS allows us to get the results which do not contradict the H1 and ZEUS data on the structure...
Source: http://arxiv.org/abs/1203.0939v1
Arxiv.org
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This paper is dedicated to the proof of new maximal regularity results involving Besov spaces for the heat equation in the half-space or in bounded or exterior domains of R^n. We strive for time independent a priori estimates in regularity spaces of type L^1(0,T;X) where X stands for some homogeneous Besov space. In the case of bounded domains, the results that we get are similar to those of the whole space or of the half-space. For exterior domains, we need to use mixed Besov norms in order to...
Source: http://arxiv.org/abs/1203.1129v1
Arxiv.org
by David Ariza-Ruiz; Laurentiu Leustean; Genaro Lopez-Acedo
texts

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Firmly nonexpansive mappings play an important role in metric fixed point theory and optimization due to their correspondence with maximal monotone operators. In this paper we do a thorough study of fixed point theory and the asymptotic behaviour of Picard iterates of these mappings in different classes of geodesic spaces, as (uniformly convex) $W$-hyperbolic spaces, Busemann spaces and CAT(0) spaces. Furthermore, we apply methods of proof mining to obtain effective rates of asymptotic...
Source: http://arxiv.org/abs/1203.1432v3
Arxiv.org
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We study the magnetic properties of topological insulators doped with isoelectronic magnetic impurities. We obtain that at zero temperature the impurities order ferromagnetically, but when raising the temperature the topological insulator undergoes a first order phase transition to a spin density wave phase before the system reaches the paramagnetic phase. The origin of this phase is the non-trivial dependence of the topological insulator spin susceptibility on the momentum. We analyze the...
Source: http://arxiv.org/abs/1203.1436v2
Arxiv.org
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The observed prevalence of oscillatory signals in the spectroscopy of biological light-harvesting complexes at ambient temperatures has led to a search for mechanisms supporting coherent transport through larger molecules in noisy environments. We demonstrate a generic mechanism supporting long-lasting electronic coherence up to 0.3 ps at a temperature of 277 K. The mechanism relies on two properties of the spectral density: (i) a large dissipative coupling to a continuum of higher-frequency...
Source: http://arxiv.org/abs/1203.1485v3
Arxiv.org
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In this paper, coordinated beamforming based on relaxed zero forcing (RZF) for K transmitter-receiver pair multiple-input single-output (MISO) and multiple-input multiple-output (MIMO) interference channels is considered. In the RZF coordinated beamforming, conventional zero-forcing interference leakage constraints are relaxed so that some predetermined interference leakage to undesired receivers is allowed in order to increase the beam design space for larger rates than those of the...
Source: http://arxiv.org/abs/1203.1758v2
Arxiv.org
by Di Zhou; Gregorio D'Agostino; Antonio Scala; H. Eugene Stanley
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It was recently recognized that interdependencies among different networks can play a crucial role in triggering cascading failures and hence system-wide disasters. A recent model shows how pairs of interdependent networks can exhibit an abrupt percolation transition as failures accumulate. We report on the effects of topology on failure propagation for a model system consisting of two interdependent networks. We find that the internal node correlations in each of the two interdependent...
Source: http://arxiv.org/abs/1203.0029v2
Arxiv.org
by Risheng Liu; Zhouchen Lin; Fernando De la Torre; Zhixun Su
texts

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Subspace clustering and feature extraction are two of the most commonly used unsupervised learning techniques in computer vision and pattern recognition. State-of-the-art techniques for subspace clustering make use of recent advances in sparsity and rank minimization. However, existing techniques are computationally expensive and may result in degenerate solutions that degrade clustering performance in the case of insufficient data sampling. To partially solve these problems, and inspired by...
Source: http://arxiv.org/abs/1203.2210v2
Arxiv.org
by Miguel Moscoso; Alexei Novikov; George Papanicolaou; Lenya Ryzhik
texts

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We present an ordinary differential equations approach to the analysis of algorithms for constructing $l_1$ minimizing solutions to underdetermined linear systems of full rank. It involves a relaxed minimization problem whose minimum is independent of the relaxation parameter. An advantage of using the ordinary differential equations is that energy methods can be used to prove convergence. The connection to the discrete algorithms is provided by the Crandall-Liggett theory of monotone nonlinear...
Source: http://arxiv.org/abs/1203.2309v1
Arxiv.org
by Rodrigo de Abreu; Vasco Guerra
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A simple and effective approach to thermodynamics is suggested, which solves the major difficulties in the traditional presentation of the subject. The internal energy is introduced from the behavior of deformable bodies, whereas the importance of keeping in mind the microscopic picture is emphasized. A straightforward model is used to show that the internal energy depends on the volume and entropy, from where the relationship between mechanics and thermodynamics is immediate, mechanics...
Source: http://arxiv.org/abs/1203.2294v1
Arxiv.org
by Anna Ferré-Mateu; Alexandre Vazdekis; Ignacio Trujillo; Patricia Sánchez-Blázquez; Elena Ricciardelli; Ignacio G. de la Rosa
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We characterize the kinematics, morphology, stellar populations and star formation histories of a sample of massive compact galaxies in the nearby Universe, which might provide a closer look to the nature of their high redshift (z > 1.0) massive counterparts. We find that nearby compact massive objects show elongated morphologies and are fast rotators. New high-quality long-slit spectra show that they have young mean luminosity-weighted ages ( < 2Gyr) and solar metallicities or above...
Source: http://arxiv.org/abs/1203.2623v1
Arxiv.org
by Eun Jung Kim; Daniel Goncalves
texts

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In the Permutation Constraint Satisfaction Problem (Permutation CSP) we are given a set of variables $V$ and a set of constraints C, in which constraints are tuples of elements of V. The goal is to find a total ordering of the variables, $\pi\ : V \rightarrow [1,...,|V|]$, which satisfies as many constraints as possible. A constraint $(v_1,v_2,...,v_k)$ is satisfied by an ordering $\pi$ when $\pi(v_1)
Source: http://arxiv.org/abs/1203.2801v1
Arxiv.org
by M. V. Ioffe; E. V. Krupitskaya; D. N. Nishnianidze
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Recently, a new quantum model - two-dimensional generalization of the Scarf II - was completely solved analytically by SUSY method for the integer values of parameter. Now, the same integrable model, but with arbitrary values of parameter, will be studied by means of supersymmetrical intertwining relations. The Hamiltonian does not allow the conventional separation of variables, but the supercharge operator does allow, leading to the partial solvability of the model. This approach, which can be...
Source: http://arxiv.org/abs/1203.3076v1
Arxiv.org
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In this paper, some new inequalities of the Hermite-Hadamard type for h-convex functions via Riemann-Liouville fractional integral are given.
Source: http://arxiv.org/abs/1203.3318v1
Arxiv.org
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In this note, we study the Martin boundary of the simple random walk on an example of directed graph. More precisely, the Martin boundary is shown to be trivial, i.e. there is no non-constant positive harmonic functions. The proof involves fine estimates of the Green function which are summarized in this note.
Source: http://arxiv.org/abs/1203.3314v1
Arxiv.org
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Let $S$ be a polynomial algebra over a field. We study classes of monomial ideals (as for example lexsegment ideals) of $S$ having minimal depth. In particular, Stanley's conjecture holds for these ideals. Also we show that if Stanley's conjecture holds for a square free monomial ideal then it holds for all its trivial modifications.
Source: http://arxiv.org/abs/1203.3319v1
Arxiv.org
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Interval translation maps (ITMs) are non-invertible generalizations of interval exchanges (IETs). The dynamics of finite type ITMs is similar to IETs, while infinite type ITMs are known to exhibit new interesting effects. In this paper, we prove the finiteness conjecture for the ITMs of three intervals. Namely, the subset of ITMs of finite type is open, dense, and has full Lebesgue measure. For this, we show that any ITM of three intervals can be reduced either to a rotation or to a double...
Source: http://arxiv.org/abs/1203.3405v3
Arxiv.org
by Evan Ranken; Parampreet Singh
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We investigate the dynamics of single and multiple scalar fields with exponential potentials, leading to power-law and assisted inflation, in loop quantum cosmology. Unlike in the classical theory, dynamical trajectories in loop quantum cosmology are generically non-singular, with a big bounce replacing classical big bang in the Planck regime. Post bounce, after a phase of super-inflation, dynamical trajectories evolve towards the classical attractor in the inflationary scenarios. Depending on...
Source: http://arxiv.org/abs/1203.3449v2
Arxiv.org
by Peiji Chen; Wenjing Ma; Srinath Mandalapu; Chandrashekhar Nagarajan; Jayavel Shanmugasundaram; Sergei Vassilvitskii; Erik Vee; Manfai Yu; Jason Zien
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A large fraction of online display advertising is sold via guaranteed contracts: a publisher guarantees to the advertiser a certain number of user visits satisfying the targeting predicates of the contract. The publisher is then tasked with solving the ad serving problem - given a user visit, which of the thousands of matching contracts should be displayed, so that by the expiration time every contract has obtained the requisite number of user visits. The challenges of the problem come from (1)...
Source: http://arxiv.org/abs/1203.3593v1
Arxiv.org
by Martin R. Hediger; Luca De Vico; Allan Svendsen; Werner Besenmatter; Jan H. Jensen
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We present a fast computational method to efficiently screen enzyme activity. In the presented method, the effect of mutations on the barrier height of an enzyme-catalysed reaction can be computed within 24 hours on roughly 10 processors. The methodology is based on the PM6 and MOZYME methods as implemented in MOPAC2009, and is tested on the first step of the amide hydrolysis reaction catalyzed by Candida Antarctica lipase B (CalB) enzyme. The barrier heights are estimated using adiabatic...
Source: http://arxiv.org/abs/1203.2950v3
Arxiv.org
by Itai Benjamini; Nicolas Curien; Agelos Georgakopoulos
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It is shown that if a planar graph admits no non-constant bounded harmonic functions then the trajectories of two independent simple random walks intersect almost surely.
Source: http://arxiv.org/abs/1203.4002v2
Arxiv.org
by Michael Menzel; Rajiv Ranjan
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Cloud computing is the latest computing paradigm that delivers hardware and software resources as virtualized services in which users are free from the burden of worrying about the low-level system administration details. Migrating Web applications to Cloud services and integrating Cloud services into existing computing infrastructures is non-trivial. It leads to new challenges that often require innovation of paradigms and practices at all levels: technical, cultural, legal, regulatory, and...
Source: http://arxiv.org/abs/1203.3997v1
Arxiv.org
by Mark Hindmarsh; Ippocratis D. Saltas
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We explore the cosmological dynamics of an effective f(R) model constructed from a renormalisation group (RG) improvement of the Einstein--Hilbert action, using the non-perturbative beta functions of the exact renormalisation group equation. The resulting f(R) model has some remarkable properties. It naturally exhibits an unstable de Sitter era in the ultraviolet (UV), dynamically connected to a stable de Sitter era in the IR, via a period of radiation and matter domination, thereby describing...
Source: http://arxiv.org/abs/1203.3957v1
The first measurement of neutron emission in electromagnetic dissociation of $^{208}$Pb nuclei at the LHC is presented. The measurement is performed using the neutron Zero Degree Calorimeters of the ALICE experiment, which detect neutral particles close to beam rapidity. The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at $\sqrt{s_{\rm NN}}$ = 2.76 TeV with neutron emission are $\sigma_{\rm single\ EMD} = 187.4\pm0.2$ (stat.) $^{+13.2}_{-11.2}$ (syst.)...
Source: http://arxiv.org/abs/1203.2436v2
Arxiv.org
by Yeow-Khiang Chia; Rajiv Soundararajan; Tsachy Weissman
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We consider the problem of estimating a signal corrupted by independent interference with the assistance of a cost-constrained helper who knows the interference causally or noncausally. When the interference is known causally, we characterize the minimum distortion incurred in estimating the desired signal. In the noncausal case, we present a general achievable scheme for discrete memoryless systems and novel lower bounds on the distortion for the binary and Gaussian settings. Our Gaussian...
Source: http://arxiv.org/abs/1203.4311v1
Arxiv.org
by K. Miyamoto; A. Kimura; T. Okuda; H. Miyahara; K. Kuroda; H. Namatame; M. Taniguchi; S. V. Eremeev; T. V. Menshchikova; E. V. Chulkov; K. A. Kokh; O. E. Tereshchenko
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Helical spin textures with the marked spin polarizations of topological surface states have been firstly unveiled by the state-of-the-art spin- and angle-resolved photoemission spectroscopy for two promising topological insulators Bi$_2$Te$_2$Se and Bi$_2$Se$_2$Te. The highly spin-polarized natures are found to be persistent across the Dirac point in both compounds. This novel finding paves a pathway to extending their utilization of topological surface state for future spintronic applications.
Source: http://arxiv.org/abs/1203.4439v1
Arxiv.org
by N. Xu; T. Qian; P. Richard; Y. -B. Shi; X. -P. Wang; P. Zhang; Y. -B. Huang; Y. -M. Xu; H. Miao; G. Xu; G. -F. Xuan; W. -H. Jiao; Z. -A. Xu; G. -H. Cao; H. Ding
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We report a systematic angle-resolved photoemission spectroscopy study on Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ for a wide range of Ru concentrations (0.15 $\leq$ \emph{x} $\leq$ 0.74). We observed a crossover from two-dimension to three-dimension for some of the hole-like Fermi surfaces with Ru substitution and a large reduction in the mass renormalization close to optimal doping. These results suggest that isovalent Ru substitution has remarkable effects on the low-energy electron excitations, which...
Source: http://arxiv.org/abs/1203.4699v1
Arxiv.org
by J. R. Rizzo; A. Pedreira; M. Gutiérrez; I. Sotuela; J. R. Larrañaga; L. Ojalvo; M. Franco; J. Cernicharo; C. García Miró; J. M. Castro Cerón; T. B. H. Kuiper; M. Vázquez; J. Calvo; A. Baquero
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The antennas of NASA's Madrid Deep Space Communications Complex (MDSCC) in Robledo de Chavela are available as single-dish radio astronomical facilities during a significant percentage of their operational time. Current instrumentation includes two antennas of 70 and 34 m in diameter, equipped with dual-polarization receivers in K (18 - 26 GHz) and Q (38 - 50 GHz) bands, respectively. We have developed and built a new wideband backend for the Robledo antennas, with the objectives (1) to...
Source: http://arxiv.org/abs/1203.4622v1
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by Thomas Dahms; Judith Lehnert; Eckehard Schöll
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We investigate the stability of synchronized states in delay-coupled networks where synchronization takes place in groups of different local dynamics or in cluster states in networks with identical local dynamics. Using a master stability approach, we find that the master stability function shows a discrete rotational symmetry depending on the number of groups. The coupling matrices that permit solutions on group or cluster synchronization manifolds show a very similar symmetry in their...
Source: http://arxiv.org/abs/1203.4916v2
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by Daniel Butter; Sergei M. Kuzenko; Ulf Lindstrom; Gabriele Tartaglino-Mazzucchelli
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There exist two superspace approaches to describe N=2 supersymmetric nonlinear sigma models in four-dimensional anti-de Sitter (AdS_4) space: (i) in terms of N=1 AdS chiral superfields, as developed in arXiv:1105.3111 and arXiv:1108.5290; and (ii) in terms of N=2 polar supermultiplets using the AdS projective-superspace techniques developed in arXiv:0807.3368. The virtue of the approach (i) is that it makes manifest the geometric properties of the N=2 supersymmetric sigma-models in AdS_4. The...
Source: http://arxiv.org/abs/1203.5001v3
Arxiv.org
by J. Tomaschko; S. Scharinger; V. Leca; J. Nagel; M. Kemmler; T. Selistrovski; D. Koelle; R. Kleiner
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Even after 25 years of research the pairing mechanism and - at least for electron doped compounds - also the order parameter symmetry of the high transition temperature (high-Tc) cuprate superconductors is still under debate. One of the reasons is the complex crystal structure of most of these materials. An exception are the infinite layer (IL) compounds consisting essentially of CuO2 planes. Unfortunately, these materials are difficult to grow and, thus, there are only few experimental...
Source: http://arxiv.org/abs/1203.5237v1
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by Frederic Campana; Fei Wang; De-Qi Zhang
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We prove two results about the natural representation of a group G of automorphisms of a normal projective threefold X on its second cohomology. We show that if X is minimal then G, modulo a normal subgroup of null entropy, is embedded as a Zariski-dense subset in a semi-simple real linear algebraic group of real rank < 3. Next, we show that X is a complex torus if the image of G is an almost abelian group of positive rank and the kernel is infinite, unless X is equivariantly non-trivially...
Source: http://arxiv.org/abs/1203.5665v1
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by Itsuhiro Kakeya; Yuta Omukai; Minoru Suzuki; Takashi Yamamoto; Kazuo Kadowaki
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Terahertz radiation from the mesa structures of Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ is detected in samples with thin electrodes $ < 100$ nm. In samples with thick electrodes $\simeq$ 400 nm, neither radiations nor voltage jumps in current-voltage characteristics are detected. This suggests that the thin electrode helps excite the Josephson plasma oscillation as a result of the poor heat flow through the electrode. The shielding effect by the electrode is not essential. We consider that the...
Source: http://arxiv.org/abs/1203.5635v1
Arxiv.org
by Xiao-Xiong Zeng; Xian-Ming Liu; Wen-Biao Liu
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The recent speculation of Maggiore that the periodicity of a black hole may be the origin of the area quantization law is confirmed. We exclusively utilize the period of motion of an outgoing wave, which is shown to be related to the vibrational frequency of the perturbed black hole, to quantize the horizon areas of a Schwarzschild black hole and a Kerr black hole. It is shown that the equally spaced area spectrum for both cases takes the same form and the spacing is the same as that obtained...
Source: http://arxiv.org/abs/1203.5947v2
Arxiv.org
by John King Gamble; Mark Friesen; S. N. Coppersmith; Xuedong Hu
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We study the dephasing of two-electron states in a single quantum dot in both GaAs and Si. We investigate dephasing induced by electron-phonon coupling and by charge noise analytically for pure orbital excitations in GaAs and Si, as well as for pure valley excitations in Si. In GaAs, polar optical phonons give rise to the most important contribution, leading to a typical dephasing rate of ~5.9 GHz. For Si, intervalley optical phonons lead to a typical dephasing rate of ~140 kHz for orbital...
Source: http://arxiv.org/abs/1203.6332v2
Arxiv.org
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The three traditional failure classes are system, media, and transaction failures. Sometimes, however, modern storage exhibits failures that differ from all of those. In order to capture and describe such cases, single-page failures are introduced as a fourth failure class. This class encompasses all failures to read a data page correctly and with plausible contents despite all correction attempts in lower system levels. Efficient recovery seems to require a new data structure called the page...
Source: http://arxiv.org/abs/1203.6404v1
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We study the multiplicities of Young modules as direct summands of permutation modules on cosets of Young subgroups. Such multiplicities have become known as the p-Kostka numbers. We classify the indecomposable Young permutation modules, and, applying the Brauer construction for p-permutation modules, we give some new reductions for p-Kostka numbers. In particular we prove that p-Kostka numbers are preserved under multiplying partitions by p, and strengthen a known reduction given by Henke,...
Source: http://arxiv.org/abs/1203.6370v1
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by J. J. R. M. van Heugten; Shaoyu Yin; H. T. C. Stoof
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The temperature dependence of the thermodynamic potential of quantum chromodynamics (QCD), the specific heat, and the quark effective mass are calculated for imbalanced quark matter in the limit of a large number of quark flavors (large-$N_F$), which corresponds to the random phase approximation. Also a generalization of the relativistic Landau effective-mass relation in the imbalanced case is given, which is then applied to this thermodynamic potential.
Source: http://arxiv.org/abs/1203.6573v1
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Numerical integration of ODEs by standard numerical methods reduces a continuous time problems to discrete time problems. Discrete time problems have intrinsic properties that are absent in continuous time problems. As a result, numerical solution of an ODE may demonstrate dynamical phenomena that are absent in the original ODE. We show that numerical integration of system with one fast rotating phase lead to a situation of such kind: numerical solution demonstrate phenomenon of scattering on...
Source: http://arxiv.org/abs/1203.4113v1
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Gaussian mixtures are a common density representation in nonlinear, non-Gaussian Bayesian state estimation. Selecting an appropriate number of Gaussian components, however, is difficult as one has to trade of computational complexity against estimation accuracy. In this paper, an adaptive Gaussian mixture filter based on statistical linearization is proposed. Depending on the nonlinearity of the considered estimation problem, this filter dynamically increases the number of components via...
Source: http://arxiv.org/abs/1203.6750v1
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by Koji Hashimoto; Norihiro Iizuka
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Robustness of the Luttinger theorem for fermionic liquids is examined in holography. The statement of the Luttinger theorem, the equality between the fermion charge density and the volume enclosed by the Fermi surface, can be mapped to a Gauss's law in the gravity dual, a la Sachdev. We show that various deformations in the gravity dual, such as inclusion of magnetic fields, a parity-violating theta-term, dilatonic deformations, and higher-derivative corrections, do not violate the holographic...
Source: http://arxiv.org/abs/1203.5388v2
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by Serge F. Timashev; Oleg Yu. Panischev; Yuriy S. Polyakov; Sergey A. Demin; Alexander Ya. Kaplan
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We apply flicker-noise spectroscopy (FNS), a time series analysis method operating on structure functions and power spectrum estimates, to study the clinical electroencephalogram (EEG) signals recorded in children/adolescents (11 to 14 years of age) with diagnosed schizophrenia-spectrum symptoms at the National Center for Psychiatric Health (NCPH) of the Russian Academy of Medical Sciences. The EEG signals for these subjects were compared with the signals for a control sample of chronically...
Source: http://arxiv.org/abs/1107.1884v3
Arxiv.org
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The Caccetta-Haggkvist conjecture made in 1978 asserts that every orgraph on n vertices without oriented cycles of length
Source: http://arxiv.org/abs/1107.2247v2
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by Pascal O. Vontobel
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It has recently been observed that the permanent of a non-negative square matrix, i.e., of a square matrix containing only non-negative real entries, can very well be approximated by solving a certain Bethe free energy function minimization problem with the help of the sum-product algorithm. We call the resulting approximation of the permanent the Bethe permanent. In this paper we give reasons why this approach to approximating the permanent works well. Namely, we show that the Bethe free...
Source: http://arxiv.org/abs/1107.4196v3
Flooved
by Prof. John Erdman
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The current set of notes is an activity-oriented companion to the study of real analysis. It is intended as a pedagogical companion for the beginner, an introduction to some of the main ideas in real analysis, a compendium of problems I think are useful in learning the subject, and an annotated reading/reference list
Topics: Maths, Mathematics
Source: http://www.flooved.com/reader/3485
Flooved
by William F. Trench
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The book is designed to �ll the gaps left in the development of calculus as it is usually presented in an elementary course, and to provide the background required for insight into more advanced courses in pure and applied mathematics.
Topics: Real Numbers, Analysis, Mathematics
Source: http://www.flooved.com/reader/3549
Flooved
by Prof. Jim Hefferon
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on functions involving a single independent variable and a single dependent variable. For
Topics: Maths, Mathematics
Source: http://www.flooved.com/reader/3490
Arxiv.org
by Animashree Anandkumar; Daniel Hsu; Sham M. Kakade
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Mixture models are a fundamental tool in applied statistics and machine learning for treating data taken from multiple subpopulations. The current practice for estimating the parameters of such models relies on local search heuristics (e.g., the EM algorithm) which are prone to failure, and existing consistent methods are unfavorable due to their high computational and sample complexity which typically scale exponentially with the number of mixture components. This work develops an efficient...
Source: http://arxiv.org/abs/1203.0683v3
Arxiv.org
by P. Plochocka; O. Portugall; P. Y. Solane; E. Gheeraert; L. Ranno; E. Bustarret; N. Bruyant; I. Breslavetz; D. K. Maude; H. Kanda; G. L. J. A. Rikken
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A magneto-optical study of the 1.4 eV Ni color center in boron-free synthetic diamond, grown at high pressure and high temperature, has been performed in magnetic fields up to 56 T. The data is interpreted using the effective spin Hamiltonian of Nazar\'e, Nevers and Davies [Phys. Rev. B 43, 14196 (1991)] for interstitial Ni$^{+}$ with the electronic configuration $3d^{9}$ and effective spin $S=1/2$. Our results unequivocally demonstrate the trigonal symmetry of the defect which preferentially...
Source: http://arxiv.org/abs/1203.0913v1
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by Miklós Arató; László Martinek
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The use of bonus-malus systems in compulsory liability automobile insurance is a worldwide applied method for premium pricing. If certain assumptions hold, like the conditional Poisson distribution of the policyholders claim number, then an interesting task is to evaluate the so called claims frequency of the individuals. Here we introduce 3 techniques, two is based on the bonus-malus class, and the third based on claims history. The article is devoted to choose the method, which fits to the...
Source: http://arxiv.org/abs/1203.0900v1
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by Eric Beutner; Henryk Zähle
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We derive a new representation for U- and V-statistics. Using this representation the asymptotic distribution of U- and V-statistics can be derived by a direct application of the Continuous Mapping Theorem. That novel approach not only encompasses most of the results on the asymptotic distribution known in literature, but also allows for the first time a unifying treatment of non-degenerate and degenerate U- and V-statistics. Moreover, it yields a new and powerful tool to derive the asymptotic...
Source: http://arxiv.org/abs/1203.1112v3
Arxiv.org
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The World Wide Web currently evolves into a Web of Linked Data where content providers publish and link data as they have done with hypertext for the last 20 years. While the declarative query language SPARQL is the de facto for querying a-priory defined sets of data from the Web, no language exists for querying the Web of Linked Data itself. However, it seems natural to ask whether SPARQL is also suitable for such a purpose. In this paper we formally investigate the applicability of SPARQL as...
Source: http://arxiv.org/abs/1203.1569v2
Arxiv.org
by W. Ebeling; W. D. Kraeft; G. Röpke
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The quantum statistical treatment of the Rutherford model, considering matter as a system of point charges (electrons and nuclei) is analyzed. First, in the historical context, the solutions of different fundamental problems, such as the divergence of the partition function, elaborated by Herzfeld, Planck, Brillouin and Rompe - most of the relevant papers published in the Annalen der Physik, are discussed. Beyond this, the modern state of art is presented and new results are given which...
Source: http://arxiv.org/abs/1203.1708v1
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by Aldo Conca; Satoshi Murai
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We study the module of Koszul cycles $Z_t(I,M)$ of a homogeneous ideal $I$ in a polynomial ring $S$ with respect to a graded module $M$. Under mild assumptions on the base field we prove that the regularity of $Z_t(I,S)$ is a subadditive function of the homological position t when I is 0-dimensional. For Borel-fixed ideals $I$ and $J$ we prove that the regularity of $Z_t(I,S/J)$ is bounded above by $t(1+\reg I)+\reg S/J$.
Source: http://arxiv.org/abs/1203.1783v1
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by Greg Aloupis; Erik D. Demaine; Alan Guo
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We prove NP-hardness results for five of Nintendo's largest video game franchises: Mario, Donkey Kong, Legend of Zelda, Metroid, and Pokemon. Our results apply to Super Mario Bros. 1, 3, Lost Levels, and Super Mario World; Donkey Kong Country 1-3; all Legend of Zelda games except Zelda II: The Adventure of Link; all Metroid games; and all Pokemon role-playing games. For Mario and Donkey Kong, we show NP-completeness. In addition, we observe that several games in the Zelda series are...
Source: http://arxiv.org/abs/1203.1895v1
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We introduce the concept of an electromagnetotoroid in astrophysics, and explore its role in polar jets. This model represents the onset of Abraham's force driven by some external source, for example, the infall of gas towards a star. The Abraham's force term is analogous to the Magnus force, and thus represents the formation of electromagnetic vortex structures in the fabric of space-time. In principle, the proposed toroidal field structure can also provide force spaceship propulsion.
Source: http://arxiv.org/abs/1203.1881v1
Arxiv.org
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The concepts of Feynman integrals in white noise analysis are used to realize the Feynman integrand for a charged particle in a constant magnetic field as a Hida distribution. For this purpose we identify the velocity dependent potential as a so called generalized Gauss kernel.
Source: http://arxiv.org/abs/1203.0089v1
Probabilistic models require the notion of event space for defining a probability measure. An event space has a probability measure which ensues the Kolmogorov axioms. However, the probabilities observed from distinct sources, such as that of relevance of documents, may not admit a single event space thus causing some issues. In this article, some results are introduced for ensuring whether the observed prob- abilities of relevance of documents admit a single event space. More- over, an...
Source: http://arxiv.org/abs/1203.2569v1
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We reprove the Lefschetz trace formula for Lubin-Tate spaces, based on the locally finite cell decompositions of these spaces obtained by Fargues, and Mieda's theorem of Lefschetz trace formula for certain open adic spaces (\cite{Mi1} theorem 3.13). This proof is rather different from those of Strauch in \cite{St} (theorem 3.3.1) and of Mieda in \cite{Mi1} (example 4.21), and is quite hopeful to generalized to some other Rapoport-Zink spaces as soon as there exist suitable cell decompositions....
Source: http://arxiv.org/abs/1203.2539v2
Arxiv.org
by Roberto Robles; Mikaël Kepenekian; Serge Monturet; Christian Joachim; Nicolás Lorente
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We evaluate the electronic, geometric and energetic properties of quasi 1-D wires formed by dangling bonds on Si(100)-H (2 x 1). The calculations are performed with density functional theory (DFT). Infinite wires are found to be insulating and Peierls distorted, however finite wires develop localized electronic states that can be of great use for molecular-based devices. The ground state solution of finite wires does not correspond to a geometrical distortion but rather to an antiferromagnetic...
Source: http://arxiv.org/abs/1203.2548v1
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by J. Konarzewski; M. Żynel
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We show that Euclidean geometry in suitably high dimension can be expressed as a theory of orthogonality of subspaces with fixed dimensions and fixed dimension of their meet.
Source: http://arxiv.org/abs/1203.2664v1
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by M. Buric; M. Dimitrijevic; V. Radovanovic; M. Wohlgenannt
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We study quantization of a gauge analogon of the Grosse-Wulkenhaar model: we find divergent one-loop contributions to the 1-point and 2-point Green functions. We obtain that five counterterms are necessary for renormalization and that all divergences are logarithmic.
Source: http://arxiv.org/abs/1203.3016v1
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We present a model based on the flavour group S3 X Z3 X Z6 to explain the main features of fermion masses and mixing. In particular, in the neutrino sector the breaking of the S3 symmetry is responsible for a naturally small r=\Delta m^2_sol/\Delta m^2_atm and suitable next-to-leading order corrections bring \theta 13 at the level of ~ 0.13, fully compatible with the recent Daya Bay result. In the quark sector, the model accommodates the different mass hierarchies in the up and down quark...
Source: http://arxiv.org/abs/1203.3126v1
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by Masato Hisakado; Shintaro Mori
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In this paper, we discuss a voting model with two candidates, C_0 and C_1. We consider two types of voters--herders and independents. The voting of independents is based on their fundamental values; on the other hand, the voting of herders is based on the number of previous votes. We can identify two kinds of phase transitions. One is an information cascade transition similar to a phase transition seen in Ising model. The other is a transition of super and normal diffusions. These phase...
Source: http://arxiv.org/abs/1203.3274v3
Arxiv.org
by B. Langerock; E. García-Toraño Andrés; F. Cantrijn
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In this paper, some new aspects related to Routh reduction of Lagrangian systems with symmetry are discussed. The main result of this paper is the introduction of a new concept of transformation that is applicable to systems obtained after Routh reduction of Lagrangian systems with symmetry, so-called magnetic Lagrangian systems. We use these transformations in order to show that, under suitable conditions, the reduction with respect to a (full) semi-direct product group is equivalent to the...
Source: http://arxiv.org/abs/1203.3302v2
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by Hugh T. Philipp; Kartik Ayyer; Mark W. Tate; Veit Elser; Sol M. Gruner
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Single-particle imaging experiments of biomolecules at x-ray free-electron lasers (XFELs) require processing of hundreds of thousands (or more) of images that contain very few x-rays. Each low-flux image of the diffraction pattern is produced by a single, randomly oriented particle, such as a protein. We demonstrate the feasibility of collecting data at these extremes, averaging only 2.5 photons per frame, where it seems doubtful there could be information about the state of rotation, let alone...
Source: http://arxiv.org/abs/1203.3353v1