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Jul 20, 2013
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A. E. Koudou; P. Vallois
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We define Letac-Wesolowski-Matsumoto-Yor (LWMY) functions as decreasing functions from $(0,\infty)$ onto $(0,\infty)$ with the following property: there exist independent, positive random variables $X$ and $Y$ such that the variables $f(X+Y)$ and $f(X)-f(X+Y)$ are independent. We prove that, under additional assumptions, there are essentially four such functions. The first one is $f(x)=1/x$. In this case, referred to in the literature as the Matsumoto-Yor property, the law of $X$ is generalized...
Source: http://arxiv.org/abs/1203.0381v1
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Jul 20, 2013
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A. M. Marino; J. B. Clark; Q. Glorieux; P. D. Lett
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We show that it is possible to use the spatial quantum correlations present in twin beams to extract information about the shape of a mask in the path of one of the beams. The scheme, based on noise measurements through homodyne detection, is useful in the regime where the number of photons is low enough that direct detection with a photodiode is difficult but high enough that photon counting is not an option. We find that under some conditions the use of quantum states of light leads to an...
Source: http://arxiv.org/abs/1203.0577v1
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Jul 20, 2013
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Aaron Roth; Grant Schoenebeck
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We consider the problem of conducting a survey with the goal of obtaining an unbiased estimator of some population statistic when individuals have unknown costs (drawn from a known prior) for participating in the survey. Individuals must be compensated for their participation and are strategic agents, and so the payment scheme must incentivize truthful behavior. We derive optimal truthful mechanisms for this problem for the two goals of minimizing the variance of the estimator given a fixed...
Source: http://arxiv.org/abs/1203.0353v1
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Sep 23, 2013
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Adrian Arancibia; Mikhail S. Plyushchay
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We study supersymmetric structure of the self-isospectral crystalline chains formed by N copies of the mutually displaced one-gap Lame systems. It is generated by the N(N-1) integrals of motion which are the first order matrix differential operators, by the same number of the nontrivial second order integrals, and by the N third order Lax integrals. We show that the structure admits distinct alternatives for a grading operator, and in dependence on its choice one of the third order matrix...
Source: http://arxiv.org/abs/1111.0600v4
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Jul 20, 2013
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Ai Min Chen; Sam Young Cho; Mun Dae Kim
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Single-step implementations of multi-qubit gates are generally believed to provide a simpler design, a faster operation, and a lower decoherence. For coupled three qubits interacting with a photon field, a realizable scheme for a single-step Toffoli gate is investigated. We find that the three qubit system can be described by four effective modified Jaynes-Cummings models in the states of two control qubits. Within the rotating wave approximation, the modified Jaynes-Cummings models are shown...
Source: http://arxiv.org/abs/1203.0374v1
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Jul 20, 2013
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Alan J. Cain; Victor Maltcev
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This paper shows that a finitely presented monoid with linear Dehn function need not have a regular cross-section, strengthening the previously-known result that such a monoid need not be presented by a finite complete string rewriting system, and contrasting the fact that finitely presented groups with linear Dehn function always have regular cross-sections.
Source: http://arxiv.org/abs/1203.0473v1
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Sep 23, 2013
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Alekh Agarwal; Miroslav Dudík; Satyen Kale; John Langford; Robert E. Schapire
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Contextual bandit learning is a reinforcement learning problem where the learner repeatedly receives a set of features (context), takes an action and receives a reward based on the action and context. We consider this problem under a realizability assumption: there exists a function in a (known) function class, always capable of predicting the expected reward, given the action and context. Under this assumption, we show three things. We present a new algorithm---Regressor Elimination--- with a...
Source: http://arxiv.org/abs/1202.1334v2
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Jul 20, 2013
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Alex Brik; Jeffrey B. Remmel
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This paper introduces an extension of Answer Set Programming called Preference Set Constraint Programming which is a convenient and general formalism to reason with preferences. PSC programming extends Set Constraint Programming introduced by Marek and Remmel (Marek and Remmel 2004) by introducing two types of preference set constraint atoms, measure preference set constraint atoms and pre-ordered preference set constraint atoms, which are extensions of set constraint atoms. We show that the...
Source: http://arxiv.org/abs/1203.0587v1
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Jul 20, 2013
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Alexander Dunford; Christopher A Watson; Robert Connon Smith
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We present Roche tomograms of the secondary star in the dwarf nova system RU Pegasi derived from blue and red arm ISIS data taken on the 4.2-m William Herschel Telescope. We have applied the entropy landscape technique to determine the system parameters and obtained component masses of M1 = 1.06 Msun, M2 = 0.96 Msun, an orbital inclination angle of i = 43 degrees, and an optimal systemic velocity of gamma = 7 km/s. These are in good agreement with previously published values. Our Roche...
Source: http://arxiv.org/abs/1203.0487v1
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Oct 24, 2014
10/14
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Alvarsson, Alexandra; Sandgren, Buster; Wendel, Carl; Alvarsson, Michael; Brismar, Kerstin
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This article is from Cardiovascular Diabetology , volume 11 . Abstract Background: Lower extremity amputations are costly and debilitating complications in patients with diabetes mellitus (DM). Our aim was to investigate changes in the amputation rate in patients with DM at the Karolinska University Hospital in Solna (KS) following the introduction of consensus guidelines for treatment and prevention of diabetic foot complications, and to identify risk groups of lower extremity amputations that...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3362773
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Sep 23, 2013
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Amy McQuillan; Suzanne Aigrain; Stephen Roberts
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We investigate the variability properties of main sequence stars in the first month of Kepler data, using a new astrophysically robust systematics correction, and find that 60% of stars are more variable then the active Sun. We define low and high variability samples, with a cut corresponding to twice the variability level of the active Sun, and compare the properties of the stars belonging to each sample. We show tentative evidence that the more active stars have lower proper motions and may...
Source: http://arxiv.org/abs/1111.5580v2
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Oct 24, 2014
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Andersson, Neil; Paredes-Solis, Sergio; Milne, Deborah; Omer, Khalid; Marokoane, Nobantu; Laetsang, Ditiro; Cockcroft, Anne
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This article is from BMJ Open , volume 2 . Abstract Objectives: To study prevalence at two time points and risk factors for experience of forced or coerced sex among school-going youth in 10 southern African countries. Design: Cross-sectional surveys, by facilitated self-administered questionnaire, of in-school youth in 2003 and 2007. Setting: Schools serving representative communities in eight countries (Botswana, Lesotho, Malawi, Mozambique, Namibia, Swaziland, Zambia and Zimbabwe) in 2003...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3293138
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Jul 20, 2013
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Andrei Khrennikov; Elemer E. Rosinger
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Motivated by the novel applications of the mathematical formalism of quantum theory and its generalizations in cognitive science, psychology, social and political sciences, and economics, we extend the notion of the tensor product and entanglement. We also study the relation between conventional entanglement of complex qubits and our generalized entanglement. Our construction can also be used to describe entanglement in the framework of non-Archimedean physics. It is also possible to construct...
Source: http://arxiv.org/abs/1203.0412v1
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Jul 20, 2013
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Anthony Hartin
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The strength of the electromagnetic fields in the bunch collision at a linear collider will have a significant effect, yielding large numbers of beamstrahlung photons and associated coherent pair production. These effects are limited in the proposed ILC beam parameters which limit the strength of the bunch field to $\Upsilon_{\text{ave}}=0.27$. The CLIC 3 Tev design by comparison has a $\Upsilon_{\text{ave}}=3.34$ yielding huge number of coherent pairs. In terms of the precision physics...
Source: http://arxiv.org/abs/1203.0045v2
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Jul 20, 2013
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Ardavan Oskooi; Pedro A. Favuzzi; Yoshinori Tanaka; Hiroaki Shigeta; Yoichi Kawakami; Susumu Noda
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We present a general framework for the design of thin-film photovoltaics based on a partially-disordered photonic crystal that has both enhanced absorption for light trapping and reduced sensitivity to the angle and polarization of incident radiation. The absorption characteristics of different lattice structures are investigated as an initial periodic structure is gradually perturbed. We find that an optimal amount of disorder controllably introduced into a multi-lattice photonic crystal...
Source: http://arxiv.org/abs/1203.0363v1
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Jul 20, 2013
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Arnaud Debussche; Marco Romito
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We prove three results on the existence of densities for the laws of finite dimensional functionals of the solutions of the stochastic Navier-Stokes equations in dimension 3. In particular, under very mild assumptions on the noise, we prove that finite dimensional projections of the solutions have densities with respect to the Lebesgue measure which have some smoothness when measured in a Besov space. This is proved thanks to a new argument inspired by an idea introduced in Fournier and...
Source: http://arxiv.org/abs/1203.0417v1
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Jul 20, 2013
07/13
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Ayesha Asloob Qureshi
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In this paper we study ideals generated by quite general sets of 2-minors of an $m \times n$-matrix of indeterminates. The sets of 2-minors are defined by collections of cells and include 2-sided ladders. For convex collections of cells it is shown that the attached ideal of 2-minors is a Cohen--Macaulay prime ideal. Primality is also shown for collections of cells whose connected components are row or column convex. Finally the class group of the ring attached to a stack polyomino and its...
Source: http://arxiv.org/abs/1203.0407v1
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Jul 20, 2013
07/13
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Ayesha Asloob Qureshi
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In this paper we consider Hibi rings and Rees rings attached to a poset. We classify the ideal lattices of posets whose Hibi relations are indispensable and the ideal lattices of posets whose Hibi relations form a quadratic Groebner basis with respect to the rank lexicographic order. Similar classifications are obtained for Rees rings of Hibi ideals.
Source: http://arxiv.org/abs/1203.0438v1
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Jul 20, 2013
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B. Olmos; R. González-Férez; I. Lesanovsky; L. Velázquez
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We investigate the dynamics of a strongly interacting spin system that is motivated by current experimental realizations of strongly interacting Rydberg gases in lattices. In particular we are interested in the temporal evolution of quantities such as the density of Rydberg atoms and density-density correlations when the system is initialized in a fully polarized state without Rydberg excitations. We show that in the thermodynamic limit the expectation values of these observables converge at...
Source: http://arxiv.org/abs/1203.0385v1
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Oct 28, 2014
10/14
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Baronti, Federico; Fantechi, Gabriele; Roncella, Roberto; Saletti, Roberto
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This article is from Sensors (Basel, Switzerland) , volume 12 . Abstract An electronic meter to measure surface seawater density is presented. It is based on the measurement of the difference in displacements of a surface level probe and a weighted float, which according to Archimedes’ law depends on the density of the water. The displacements are simultaneously measured using a high-accuracy magnetostrictive sensor, to which a custom electronic board provides a wireless connection and power...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3376632
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Sep 18, 2013
09/13
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Belle Collaboration; Y. Sato; H. Yamamoto; H. Aihara; D. M. Asner; V. Aulchenko; T. Aushev; T. Aziz; A. M. Bakich; V. Bhardwaj; B. Bhuyan; M. Bischofberger; A. Bondar; A. Bozek; M. Bračko; T. E. Browder; P. Chang; P. Chen; B. G. Cheon; K. Chilikin; R. Chistov; I. -S. Cho; K. Cho; S. -K. Choi; Y. Choi; J. Dalseno; Z. Doležal; Z. Drásal; S. Eidelman; D. Epifanov; J. E. Fast; V. Gaur; N. Gabyshev; Y. M. Goh; B. Golob; J. Haba; T. Hara; K. Hayasaka; H. Hayashii; Y. Horii; Y. Hoshi; W. -S. Hou;...
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We report a measurement of the CP-violation parameter sin2$\phi_1$ at the $\Upsilon(5S)$ resonance using a new tagging method, called "$B$-$\pi$ tagging." In $\Upsilon(5S)$ decays containing a neutral $B$ meson, a charged $B$, and a charged pion, the neutral $B$ is reconstructed in the $J/\psi K_S^0$ CP-eigenstate decay channel. The initial flavor of the neutral $B$ meson at the moment of the $\Upsilon(5S)$ decay is opposite to that of the charged $B$ and may thus be inferred from the...
Source: http://arxiv.org/abs/1201.3502v3
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Sep 24, 2013
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Bengt Eliasson; Padma Kant Shukla
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We present a nonlinear theory for relativistic X-ray free electron lasers in the quantum regime, using a collective Klein-Gordon (KG) equation (for relativistic electrons), which is coupled with the Maxwell-Poisson equations for the electromagnetic and electrostatic fields. In our model, an intense electromagnetic wave is used as a wiggler which interacts with a relativistic electron beam to produce coherent tunable radiation. The KG-Maxwell-Poisson model is used to derive a general nonlinear...
Source: http://arxiv.org/abs/1112.5558v2
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Jul 20, 2013
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Bernard Teissier
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This note presents three resonances in commutative algebra and analytic geometry of the concept of Lojasiewicz inequality. The first is the interpretation in complex analytic geometry of the best possible exponent for a function g with respect to an ideal I at a point of a reduced complex space X as the inclination of a edge of a Newton polygon associated to the dicritical components of as log resolution of I. The second calls attention to recent results which show that some rational numbers...
Source: http://arxiv.org/abs/1203.0480v1
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Oct 28, 2014
10/14
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Bhandarwar, Ajay H; Tayade, Mukund B; Borisa, Ashok D; Kasat, Gaurav V
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This article is from Journal of Minimal Access Surgery , volume 9 . Abstract Mesenteric cysts are rare abdominal tumours. They are found in the mesentery of small bowel (66%) and mesentery of large intestine (33%), usually in the right colon. Very few cases have been reported of tumours found in mesentery of descending colon, sigmoid or rectum. Mesenteric cysts do not show classical clinical findings and are detected incidentally during imaging due to absent or non-specific clinical...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3630717
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Oct 27, 2014
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Bhattacharjee, Suchandra; Chatterjee, Saurabh; Jiang, JinJie; Sinha, Birandra Kumar; Mason, Ronald P.
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This article is from Nucleic Acids Research , volume 40 . Abstract Oxidative stress-related damage to the DNA macromolecule produces lesions that are implicated in various diseases. To understand damage to DNA, it is important to study the free radical reactions causing the damage. Measurement of DNA damage has been a matter of debate as most of the available methods measure the end product of a sequence of events and provide limited information on the initial free radical formation. We report...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3384307
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Sep 24, 2013
09/13
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Bogdan Teaca; Alejandro Banon Navarro; Frank Jenko; Stephan Brunner; Laurent Villard
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The nature of the nonlinear interactions in gyrokinetic (GK) turbulence, driven by an ion-temperature gradient instability, is investigated using numerical simulations of single ion species plasma in three-dimensional flux tube geometry. To account for the level of separation existing between scales involved in an energetic interaction, the degree of locality of the free energy scale flux is analyzed employing Kraichnan's infrared (IR) and ultraviolet locality functions. Due to the nontrivial...
Source: http://arxiv.org/abs/1202.6160v2
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Oct 27, 2014
10/14
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Bourquin, Celine; Stiefel, Friedrich; Berney, Alexandre; Singy, Pascal
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This article is from BMC Medical Education , volume 12 . Abstract Background: This exploratory study investigated the motives of medical students (N = 63) for using indirect questions of the type I don't know if [you have already heard about chemotherapies], I don't know how [you are], or I don't know what [you do for a living] in simulated patient interviews during a communication skills course. Methods: I don't know questions (IDK-Qs) were observed during the initial evaluation of students'...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3310746
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Oct 25, 2014
10/14
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Burkart, Anna D.; Xiong, Bo; Baibakov, Boris; Jimenez-Movilla, Maria; Dean, Jurrien
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This article is from The Journal of Cell Biology , volume 197 . Abstract After fertilization, the metalloendoprotease ovastacin is released by cortical granule exocytosis and cleaves the zona pellucida glycoprotein ZP2, an essential step to block sperm binding to an already fertilized egg.
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3317803
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Jul 20, 2013
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C. C. Worley; P. L. Cottrell
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Medium-resolution (R~6,500) spectra of 97 giant stars in the globular cluster 47 Tucanae (47 Tuc) have been used to derive the C and N abundance sensitive index, deltaC, and to infer abundances of several key elements, Fe, Na, Si, Ca, Zr and Ba for a sample of 13 of these stars with similar Teff and log g. These stars have stellar properties similar to the well-studied 47 Tuc giant star, Lee 2525, but with a range of CN excess (deltaC) values which are a measure of the CN abundance. The deltaC...
Source: http://arxiv.org/abs/1203.0554v1
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Sep 23, 2013
09/13
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C. D. Hamley; C. S. Gerving; T. M. Hoang; E. M. Bookjans; M. S. Chapman
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Using squeezed states it is possible to surpass the standard quantum limit of measurement uncertainty by reducing the measurement uncertainty of one property at the expense of another complementary property. Squeezed states were first demonstrated in optical fields and later with ensembles of pseudo spin-1/2 atoms using non-linear atom-light interactions. Recently, collisional interactions in ultracold atomic gases have been used to generate a large degree of quadrature spin squeezing in...
Source: http://arxiv.org/abs/1111.1694v2
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Oct 27, 2014
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Chai, Yun-Jing; Cui, Cheng-Bin; Li, Chang-Wei; Wu, Chang-Jing; Tian, Cong-Kui; Hua, Wei
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This article is from Marine Drugs , volume 10 . Abstract A new approach to activate silent gene clusters for dormant secondary metabolite production has been developed by introducing gentamicin-resistance to an originally inactive, marine-derived fungal strain Penicillium purpurogenum G59. Upon treatment of the G59 spores with a high concentration of gentamicin in aqueous DMSO, a total of 181 mutants were obtained by single colony isolation. In contrast to the strain G59, the EtOAc extracts of...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3347015
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Jul 20, 2013
07/13
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Charles Delorme; Guillermo Pineda-Villavicencio
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In 1855 H. J. S. Smith proved Fermat's Two Squares using the notion of palindromic continuants. In this paper we extend Smith's approach to proper quadratic form representations in some commutative Euclidean rings, including rings of integers and rings of polynomials over fields of characteristic different from 2. While our results are natural extensions of Smith's approach and are unlikely to be new, we believe our presentation is new.
Source: http://arxiv.org/abs/1203.0347v1
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Jul 20, 2013
07/13
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Charles Fefferman; C. Robin Graham
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Direct proofs are given of Juhl's formulae for GJMS operators and Q-curvatures starting from the original construction of GJMS.
Source: http://arxiv.org/abs/1203.0360v1
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Oct 28, 2014
10/14
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Chen, Guifang; Ni, Shengfa; Zhu, Sha; Yang, Jinghua; Yin, Yongmei
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This article is from International Journal of Molecular Sciences , volume 13 . Abstract Gamma glutamyl transpeptidase (GGT) is a transferase, which is of great importance in sustaining intracellular cysteine and glutathione levels. The abnormal expression of GGT is significantly associated with features of many metabolic syndromes (e.g., hepatocellular carcinoma). Therefore, it is essential to develop methods to detect GGT so as to monitor the physiological or pathological phenomena related to...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3317688
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Oct 27, 2014
10/14
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Chinnusamy, Palanivelu; Ahluwalia, Jasmeet Singh; Palanisamy, Senthilnathan; Seshiyer, Rajan Pidigu
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This article is from Journal of Minimal Access Surgery , volume 9 . Abstract INTRODUCTION:: Surgery has the potential to remove the entire hydatid cyst and can lead to complete cure. Presence of hydatid cysts in multiple abdominal organs imposes special challenges for laparoscopic management. The patient position and port placement for one organ may not be adequate for other and proper exposure in hydatid cyst is of paramount importance to prevent spillage and complete removal of the cyst....
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3673583
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Oct 28, 2014
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Chisholm, Dan; Saxena, Shekhar
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This article is from BMJ : British Medical Journal , volume 344 . Abstract Objective To assess the comparative costs and effects of interventions to combat five neuropsychiatric conditions (schizophrenia, bipolar disorder, depression, epilepsy, and heavy alcohol use).Design Cost effectiveness analysis based on an epidemiological model.Setting Two epidemiologically defined World Health Organization sub-regions of the world: countries in sub-Saharan Africa with very high adult and high child...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3292519
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Jul 20, 2013
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Chiung-Yuan Lin; Jheng-Lian Li; Yao-Hsien Hsieh; B. A. Jones
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We report the ab initio study of rare-earth adatoms (Gd) on an insulating surface. This surface is of interest because of previous studies by scanning tunneling microscopy showing spin excitations of transition metal adatoms. The present work is the first study of rare-earth spin-coupled adatoms, as well as the geometry effect of spin coupling, and the underlying mechanism of ferromagnetic coupling. The exchange coupling between Gd atoms on the surface is calculated to be antiferromagnetic in a...
Source: http://arxiv.org/abs/1203.0418v1
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Sep 18, 2013
09/13
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Chris. J. Oates; Steven. M. Hill; Sach Mukherjee
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Recently, Li et al. (Bioinformatics 27(19), 2686-91, 2011) proposed a method, called Differential Equation-based Local Dynamic Bayesian Network (DELDBN), for reverse engineering gene regulatory networks from time-course data. We commend the authors for an interesting paper that draws attention to the close relationship between dynamic Bayesian networks (DBNs) and differential equations (DEs). Their central claim is that modifying a DBN to model Euler approximations to the gradient rather than...
Source: http://arxiv.org/abs/1201.3380v2
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Sep 23, 2013
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Christine Bessenrodt; Stephanie van Willigenburg
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In this paper we classify all Schur functions and skew Schur functions that are multiplicity free when expanded in the basis of fundamental quasisymmetric functions, termed F-multiplicity free. Combinatorially, this is equivalent to classifying all skew shapes whose standard Young tableaux have distinct descent sets. We then generalize our setting, and classify all F-multiplicity free quasisymmetric Schur functions with one or two terms in the expansion, or one or two parts in the indexing...
Source: http://arxiv.org/abs/1105.4212v2
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Sep 23, 2013
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Christophe Gissinger
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We present a new chaotic system of three coupled ordinary differential equations, limited to quadratic nonlinear terms. A wide variety of dynamical regimes are reported. For some parameters, chaotic reversals of the amplitudes are produced by crisis-induced intermittency, following a mechanism different from what is generally observed in similar deterministic models. Despite its simplicity, this system therefore generates a rich dynamics, able to model more complex physical systems. In...
Source: http://arxiv.org/abs/1109.6569v2
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Jul 20, 2013
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Claude Duhr
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We show how the Hopf algebra structure of multiple polylogarithms can be used to simplify complicated expressions for multi-loop amplitudes in perturbative quantum field theory and we argue that, unlike the recently popularized symbol-based approach, the coproduct incorporates information about the zeta values. We illustrate our approach by rewriting the two-loop helicity amplitudes for a Higgs boson plus three gluons in a simplified and compact form involving only classical polylogarithms.
Source: http://arxiv.org/abs/1203.0454v1
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Jul 20, 2013
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Corinna Cortes; Mehryar Mohri; Afshin Rostamizadeh
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This paper presents new and effective algorithms for learning kernels. In particular, as shown by our empirical results, these algorithms consistently outperform the so-called uniform combination solution that has proven to be difficult to improve upon in the past, as well as other algorithms for learning kernels based on convex combinations of base kernels in both classification and regression. Our algorithms are based on the notion of centered alignment which is used as a similarity measure...
Source: http://arxiv.org/abs/1203.0550v1
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Jul 20, 2013
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Costantino Sigismondi
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The Jesuit scientist Christopher Clavius (1538-1612) has been the most influential teacher of the renaissance. His contributions to algebra, geometry, astronomy and cartography are enormous. He paved the way, with his texts and his teaching for 40 years in the the Collegio Romano, to the development of these sciences and their fruitful spread all around the World, along the commercial paths of Portugal, which become also the missionary paths for the Jesuits. The books of Clavius were translated...
Source: http://arxiv.org/abs/1203.0476v1
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Jul 20, 2013
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Cyril Branciard; Nicolas Brunner; Harry Buhrman; Richard Cleve; Nicolas Gisin; Samuel Portmann; Denis Rosset; Mario Szegedy
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Entanglement appears under two different forms in quantum theory, namely as a property of states of joint systems and as a property of measurement eigenstates in joint measurements. By combining these two aspects of entanglement, it is possible to generate nonlocality between particles that never interacted, using the protocol of entanglement swapping. We show that even in the more constraining bilocal scenario where distant sources of particles are assumed to be independent, i.e. to share no...
Source: http://arxiv.org/abs/1203.0445v1
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Sep 23, 2013
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D. Aasen; Stefano Chesi; W. A. Coish
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We study the influence of spin-orbit interactions on quasiparticle dispersions in two-dimensional electron and heavy-hole liquids in III-V semiconductors. To obtain closed-form analytical results, we restrict ourselves to spin-orbit interactions with isotropic spectrum and work within the screened Hartree-Fock approximation, valid in the high-density limit. For electrons having a linear-in-momentum Rashba (or, equivalently, Dresselhaus) spin-orbit interaction, we show that the screened...
Source: http://arxiv.org/abs/1110.6661v2
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Jul 20, 2013
07/13
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D. Kozieł-Wierzbowska; M. Jamrozy; S. Zola; G. Stachowski; A. Kuźmicz
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We announce the discovery of a unique combination of features in a radio source identified with the merger galaxy CGCG 292-057. The radio galaxy both exhibits a highly complex, X-like structure and shows signs of recurrent activity in the form of double-double morphology. The outer lobes of CGCG 292-057 are characterized by low radio power, P_{1400MHz} \simeq 2 * 10^{24} W\Hz^{-1}, placing this source below the FRII/FRI luminosity threshold, and are highly polarized (almost 20 per cent at 1400...
Source: http://arxiv.org/abs/1203.0538v1
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96
Jul 20, 2013
07/13
by
D. Reitz; A. Rauschenbeutel
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A double-helix optical trapping potential for cold atoms can be straightforwardly created inside the evanescent field of an optical nanofiber. It suffices to send three circularly polarized light fields through the nanofiber; two counterpropagating and far red-detuned with respect to the atomic transition and the third far blue-detuned. Assuming realistic experimental parameters, the transverse confinement of the resulting potential allows one to reach the one-dimensional regime with cesium...
Source: http://arxiv.org/abs/1203.0499v1
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43
Sep 23, 2013
09/13
by
D. Samart; Y. Yan; Th. Gutsche; Amand Faessler
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Partial decay widths of various decay channels of the X(1835) are evaluated in the 3P0 quark model, assuming that the X(1835) is a nucleon-antinucleon bound state. It is found that the decays to rho+rho, omega+omega and pion+a0(1450) dominate over other channels, and that the product branching fractions of J/psi to pion+pion+eta and J/psi to pion+pion+eta' are in the same order. We suggest that the X(1835) may be searched in the pion+a0(1450) channel.
Source: http://arxiv.org/abs/1202.5862v2
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39
Oct 24, 2014
10/14
by
Damman, Peter; Kikkert, Wouter J; Woudstra, Pier; Kuijt, Wichert J; Grundeken, Maik J D; Harskamp, Ralf E; Baan, Jan; Vis, Marije M; Henriques, Jose P S; Piek, Jan J; van Straalen, Jan P; Fischer, Johan C; Tijssen, Jan G P; de Winter, Robbert J
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This article is from BMJ Open , volume 2 . Abstract Objective: To evaluate gender differences in the prognostic value of renal function for mortality in ST-segment elevation myocardial infarction (STEMI) patients undergoing primary percutaneous coronary intervention (PPCI). Design: Prospective single-center cohort. Setting: Single tertiary referral center in Amsterdam, The Netherlands. Patients consecutive STEMI patients undergoing PPCI (1412 men and 558 women). Main outcome measure: The...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3293134
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54
Sep 23, 2013
09/13
by
Dariusz Chruściński; Gniewomir Sarbicki
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Exposed positive maps in matrix algebras define a dense subset of extremal maps. We provide a sufficient condition for a positive map to be exposed. This is an analog of a spanning property which guaranties that a positive map is optimal. We analyze a class of decomposable maps for which this condition is also necessary.
Source: http://arxiv.org/abs/1111.2012v2
