1,318 research outputs found
Quantum Hypergraph States
We introduce a class of multiqubit quantum states which generalizes graph
states. These states correspond to an underlying mathematical hypergraph, i.e.
a graph where edges connecting more than two vertices are considered. We derive
a generalised stabilizer formalism to describe this class of states. We
introduce the notion of k-uniformity and show that this gives rise to classes
of states which are inequivalent under the action of the local Pauli group.
Finally we disclose a one-to-one correspondence with states employed in quantum
algorithms, such as Deutsch-Jozsa's and Grover's.Comment: 9+5 pages, 5 figures, 1 table, published versio
Exploratory Analysis of Functional Data via Clustering and Optimal Segmentation
We propose in this paper an exploratory analysis algorithm for functional
data. The method partitions a set of functions into clusters and represents
each cluster by a simple prototype (e.g., piecewise constant). The total number
of segments in the prototypes, , is chosen by the user and optimally
distributed among the clusters via two dynamic programming algorithms. The
practical relevance of the method is shown on two real world datasets
Energetics of running in top-level marathon runners from Kenya
On ten top-level Kenyan marathon runners (KA) plus nine European controls (EC, equivalent to KA), we measured maximal oxygen consumption ( ) and the energy cost of running (C r) on track during training camps at moderate altitude, to better understand the KA dominance in the marathon. At each incremental running speed, steady-state oxygen consumption ( ) was measured by telemetric metabolic cart, and lactate by electro-enzymatic method. The speed requiring provided the maximal aerobic velocity (v max). The energy cost of running was calculated by dividing net by the corresponding speed. The speed at lactate threshold (v ÎAN) was computed from individual LĂąb versus speed curves. The sustainable fraction (F d) at v ÎAN (F ÎAN) was computed dividing v ÎAN by v max. The F d for the marathon (F mar) was determined as F mar=0.92 F ÎAN. Overall, (64.9±5.8 vs. 63.9±3.7mlkgâ1minâ1), v max (5.55±0.30 vs. 5.41±0.29msâ1) and C r (3.64±0.28 vs. 3.63±0.31Jkgâ1mâ1) resulted the same in KA as in EC. In both groups, C r increased linearly with the square of speed. F ÎAN was 0.896±0.054 in KA and 0.909±0.068 in EC; F mar was 0.825±0.050 in KA and 0.836±0.062 in EC (NS). Accounting for altitude, running speed predictions from present data are close to actual running performances, if F ÎAN instead of F mar is taken as index of F d. In conclusion, both KA and EC did not have a very high , but had extremely high F d, and low C r, equal between them. The dominance of KA over EC cannot be explained on energetic ground
Limits on the Non-Standard Interactions of Neutrinos from Colliders
We provide an effective Lagrangian analysis of contact non-standard
interactions of neutrinos with electrons, which can be effectively mediated by
extra particles, and examine the associated experimental limits. At present,
such interactions are strongly constrained only for : the bounds are
loose for and absent for . We emphasize the unique role
played by the reaction in providing direct
constraints on such non-standard interactions.Comment: 15 LaTeX pages, 6 postscript figures, uses epsfig. New discussion on
bounds from reactor anti-neutrino scattering off electrons; minor changes. To
appear on Phys. Lett.
Clinical signs and occurrence of antibodies anti-Chlamydophila abortus in ovines of Sao Paulo and Minas Gerais
A Chlamydophila abortusi, anteriormente conhecida como Chlamydia psittaci sovovar 1, Ă© uma bactĂ©ria Gram negativa, intracelular obrigatĂłria. Esse micro-organismo Ă© frequentemente encontrado em distĂșrbios reprodutivos em ovinos, bovinos e caprinos, sendo o aborto epizoĂłtico dos bovinos e o aborto enzoĂłtico dos ovinos e caprinos as manifestaçÔes mais importantes. Considerando-se o pouco material literĂĄrio a respeito da clamidofilose no Brasil, a pesquisa teve como objetivo determinar a presença de anticorpos fixadores de complemento anti-Chlamydophila abortusi, correlacionando os resultados obtidos com achados no exame clĂnico e histĂłrico dos animais, alĂ©m de alteraçÔes nos Ăndices zootĂ©cnicos, em especial na esfera reprodutiva, tais como alto Ăndice de repetição de cio, nĂșmero elevado de abortamentos, elevado nĂșmero de natimortos, entre outros. Foram testadas para prova de fixação do complemento 220 amostras de soro de ovinos, de 26 propriedades, distribuĂdas em 19 municĂpios, com relato de manifestação reprodutiva, obtendo-se 19,55% (43/220) de testes positivos para Chlamydophila abortusi, com ocorrĂȘncia de foco constatada de 61,53%. No geral, a titulação de anticorpos encontrada foi baixa, com tĂtulo nĂŁo superior a 64. A frequĂȘncia de manifestação reprodutiva mais observada foi o aborto, representando 65,12% (28/43) do nĂșmero total de animais soropositivos, seguido de repetição de cio juntamente com nascimento de cordeiro fraco, com frequĂȘncia de 6,98% (3/43) e, por fim, morte neonatal com 4,65% (2/43), sendo que nĂŁo houve associação significativa entre animais que foram positivos ao teste e a esses fatores.The Chlamydophila abortus was previously known as Chlamydia psittaci sorovar 1, it is a Gram negative and obligate intracellular bacteria. This microorganism is frequently related with reproductive manifestation in ovines, goats and bovines. The major manifestation are Enzootic abortion in bovines and enzootic abortion in small ruminants. There are few literary material about clamidofilosis in Brazil, so the present research had the objective to determine the presence of complement fixing antibodies anti-Chlamydophila abortus, correlating the results with the clinical examination and historical of the animals, besides variation in the zootecnic index, especially in the reproductive characters like high index of cio repetition, high abortion number, high neonatal mortality number etc. It was tested for the complement fixation test 220 serum ovine samples, from 26 properties, distributed in 19 cities, with historical of reproductive manifestation. It was found 19.55% (43/220) of positive tests to Chlamydophila abortus, obtaining 61.53% of focus occurrence. In the study low antibodies titers were found, not superior of 64. Abortion was the major reproductive manifestation observed, expressing 65.12% (28/43) of the total number animals serum positive, followed by estrus repetition and weak lamb born, with a frequency of 6.98% (3/43) and, lastly, neonatal mortality death with 4.65% (2/43). No significant association was observed between serum positivity and these factors
The Out-of-Equilibrium Time-Dependent Gutzwiller Approximation
We review the recently proposed extension of the Gutzwiller approximation, M.
Schiro' and M. Fabrizio, Phys. Rev. Lett. 105, 076401 (2010), designed to
describe the out-of-equilibrium time-evolution of a Gutzwiller-type variational
wave function for correlated electrons. The method, which is strictly
variational in the limit of infinite lattice-coordination, is quite general and
flexible, and it is applicable to generic non-equilibrium conditions, even far
beyond the linear response regime. As an application, we discuss the quench
dynamics of a single-band Hubbard model at half-filling, where the method
predicts a dynamical phase transition above a critical quench that resembles
the sharp crossover observed by time-dependent dynamical mean field theory. We
next show that one can actually define in some cases a multi-configurational
wave function combination of a whole set of mutually orthogonal Gutzwiller wave
functions. The Hamiltonian projected in that subspace can be exactly evaluated
and is equivalent to a model of auxiliary spins coupled to non-interacting
electrons, closely related to the slave-spin theories for correlated electron
models. The Gutzwiller approximation turns out to be nothing but the mean-field
approximation applied to that spin-fermion model, which displays, for any
number of bands and integer fillings, a spontaneous symmetry breaking
that can be identified as the Mott insulator-to-metal transition.Comment: 25 pages. Proceedings of the Hvar 2011 Workshop on 'New materials for
thermoelectric applications: theory and experiment
Clinical signs and occurrence of antibodies anti-Chlamydophila abortus in ovines of SĂŁo Paulo and Minas Gerais
A Chlamydophila abortus, anteriormente conhecida como Chlamydia psittaci sovovar 1, Ă© uma bactĂ©ria Gram negativa, intracelular obrigatĂłria. Esse micro-organismo Ă© frequentemente encontrado em distĂșrbios reprodutivos em ovinos, bovinos e caprinos, sendo o aborto epizoĂłtico dos bovinos e o aborto enzoĂłtico dos ovinos e caprinos as manifestaçÔes mais importantes. Considerando-se o pouco material literĂĄrio a respeito da clamidofilose no Brasil, a pesquisa teve como objetivo determinar a presença de anticorpos fixadores de complemento anti-Chlamydophila abortus, correlacionando os resultados obtidos com achados no exame clĂnico e histĂłrico dos animais, alĂ©m de alteraçÔes nos Ăndices zootĂ©cnicos, em especial na esfera reprodutiva, tais como alto Ăndice de repetição de cio, nĂșmero elevado de abortamentos, elevado nĂșmero de natimortos, entre outros. Foram testadas para prova de fixação do complemento 220 amostras de soro de ovinos, de 26 propriedades, distribuĂdas em 19 municĂpios, com relato de manifestação reprodutiva, obtendo-se 19,55% (43/220) de testes positivos para Chlamydophila abortus, com ocorrĂȘncia de foco constatada de 61,53%. No geral, a titulação de anticorpos encontrada foi baixa, com tĂtulo nĂŁo superior a 64. A frequĂȘncia de manifestação reprodutiva mais observada foi o aborto, representando 65,12% (28/43) do nĂșmero total de animais soropositivos, seguido de repetição de cio juntamente com nascimento de cordeiro fraco, com frequĂȘncia de 6,98% (3/ 43) e, por fim, morte neonatal com 4,65% (2/43), sendo que nĂŁo houve associação significativa entre animais que foram positivos ao teste e a esses fatores.The Chlamydophila abortus was previously known as Chlamydia psittaci sorovar 1, it is a Gram negative and obligate intracellular bacteria. This microorganism is frequently related with reproductive manifestation in ovines, goats and bovines. The major manifestation are Enzootic abortion in bovines and enzootic abortion in small ruminants. There are few literary material about clamidofilosis in Brazil, so the present research had the objective to determine the presence of complement fixing antibodies anti-Chlamydophila abortus, correlating the results with the clinical examination and historical of the animals, besides variation in the zootecnic index, especially in the reproductive characters like high index of cio repetition, high abortion number, high neonatal mortality number etc. It was tested for the complement fixation test 220 serum ovine samples, from 26 properties, distributed in 19 cities, with historical of reproductive manifestation. It was found 19.55% (43/220) of positive tests to Chlamydophila abortus, obtaining 61.53% of focus occurrence. In the study low antibodies titers were found, not superior of 64. Abortion was the major reproductive manifestation observed, expressing 65.12% (28/43) of the total number animals serum positive, followed by estrus repetition and weak lamb born, with a frequency of 6.98% (3/43) and, lastly, neonatal mortality death with 4.65% (2/43). No significant association was observed between serum positivity and these factors
Full configuration interaction calculation of BeH adiabatic states
An all-electron full configuration interaction (FCI) calculation of the adiabatic potential energy curves of some of the lower states of BeH molecule is presented. A moderately large ANO basis set of atomic natural orbitals (ANO) augmented with Rydberg functions has been used in order to describe the valence and Rydberg states and their interactions. The Rydberg set of ANOs has been placed on the Be at all bond distances. So, the basis set can be described as 4s3p2d1f/3s2p1d(Be/H)+4s4p2d(Be). The dipole moments of several states and transition dipole strengths from the ground state are also reported as a function of the RBeâH distance. The position and the number of states involved in several avoided crossings present in this system have been discussed. Spectroscopic parameters have been calculated from a number of the vibrational states that result from the adiabatic curves except for some states in which this would be completely nonsense, as it is the case for the very distorted curves of the 3s and 3pâmath states or the double-well potential of the 4pâmath state. The so-called âD complexâ at 54â050âcmâ1 (185.0ânm) is resolved into the three 3d substates (math,math,math). A diexcited valence state is calculated as the lowest state of math symmetry and its spectroscopic parameters are reported, as well as those of the 2âmath (4d) state The adiabatic curve of the 4âmath state shows a swallow well at large distances (around 4.1âĂ
) as a result of an avoided crossing with the 3âmath state. The probability that some vibrational levels of this well could be populated is discussed within an approached LandauâZerner model and is found to be high. No evidence is found of the E(4sÏ) math state in the region of the âD complexâ. Instead, the spectroscopic properties obtained from the (4sÏ) 6âmath adiabatic curve of the present work seem to agree with those of the experimental F(4pÏ) math state. The FCI calculations provide benchmark results for other correlation models for the open-shell BeH system and evidence both the limitations and capabilities of the basis [email protected] [email protected]
Light inactivation of water transport and proteinâprotein interactions of aquaporinâKiller Red chimeras
Aquaporins (AQPs) have a broad range of cellular and organ functions; however, nontoxic inhibitors of AQP water transport are not available. Here, we applied chromophore-assisted light inactivation (CALI) to inhibit the water permeability of AQP1, and of two AQP4 isoforms (M1 and M23), one of which (M23) forms aggregates at the cell plasma membrane. Chimeras containing Killer Red (KR) and AQPs were generated with linkers of different lengths. Osmotic water permeability of cells expressing KR/AQP chimeras was measured from osmotic swellingâinduced dilution of cytoplasmic chloride, which was detected using a genetically encoded chloride-sensing fluorescent protein. KR-AQP1 red fluorescence was bleached rapidly (âŒ10% per second) by wide-field epifluorescence microscopy. After KR bleaching, KR-AQP1 water permeability was reduced by up to 80% for the chimera with the shortest linker. Remarkably, CALI-induced reduction in AQP4-KR water permeability was approximately twice as efficient for the aggregate-forming M23 isoform; this suggests intermolecular CALI, which was confirmed by native gel electrophoresis on cells coexpressing M23-AQP4-KR and myc-tagged M23-AQP4. CALI also disrupted the interaction of AQP4 with a neuromyelitis optica autoantibody directed against an extracellular epitope on AQP4. CALI thus permits rapid, spatially targeted and irreversible reduction in AQP water permeability and interactions in live cells. Our data also support the utility of CALI to study proteinâprotein interactions as well as other membrane transporters and receptors
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