2,251 research outputs found
The U(1)-Higgs Model: Critical Behaviour in the Confinig-Higgs region
We study numerically the critical properties of the U(1)-Higgs lattice model,
with fixed Higgs modulus, in the region of small gauge coupling where the Higgs
and Confining phases merge. We find evidence of a first order transition line
that ends in a second order point. By means of a rotation in parameter space we
introduce thermodynamic magnitudes and critical exponents in close resemblance
with simple models that show analogous critical behaviour. The measured data
allow us to fit the critical exponents finding values in agreement with the
mean field prediction. The location of the critical point and the slope of the
first order line are accurately given.Comment: 21 text pages. 12 postscript figures available on reques
Motivaciones ocupacionales en adultos
Se intentó conocer las motivaciones ocupacionales en sujetos adultos de ambos sexos, cuyas edades fluctuaron entre los 20 y 50 años. Se trabajó con 150 sujetos; hombres y mujeres divididos equitativamente. Se aplicó el Cuestionario de
Motivaciones Ocupacionales (Faletty & Moreno, 1999) evaluando de manera individual a los sujetos. Analizamos en este artículo solamente los ítemes de este cuestionario en que se encontraron diferencias significativas entre hombres y mujeres
Empirical Relationship between Intra-Purine and Intra-Pyrimidine Differences in Conserved Gene Sequences
DNA sequences seen in the normal character-based representation appear to have a formidable mixing of the four nucleotides without any apparent order. Nucleotide frequencies and distributions in the sequences have been studied extensively, since the simple rule given by Chargaff almost a century ago that equates the total number of purines to the pyrimidines in a duplex DNA sequence. While it is difficult to trace any relationship between the bases from studies in the character representation of a DNA sequence, graphical representations may provide a clue. These novel representations of DNA sequences have been useful in providing an overview of base distribution and composition of the sequences and providing insights into many hidden structures. We report here our observation based on a graphical representation that the intra-purine and intra-pyrimidine differences in sequences of conserved genes generally follow a quadratic distribution relationship and show that this may have arisen from mutations in the sequences over evolutionary time scales. From this hitherto undescribed relationship for the gene sequences considered in this report we hypothesize that such relationships may be characteristic of these sequences and therefore could become a barrier to large scale sequence alterations that override such characteristics, perhaps through some monitoring process inbuilt in the DNA sequences. Such relationship also raises the possibility of intron sequences playing an important role in maintaining the characteristics and could be indicative of possible intron-late phenomena
Human resource allocation management in multiple projects using sociometric techniques
This article describes a new application of key psychological concepts in the area of Sociometry for the selection of workers within organizations in which projects are developed. The project manager can use a new procedure to determine which individuals should be chosen from a given pool of resources and how to combine them into one or several simultaneous groups/projects in order to assure the highest possible overall work efficiency from the standpoint of social interaction. The optimization process was carried out by means of matrix calculations performed using a computer or even manually, and based on a number of new ratios generated ad-hoc and composed on the basis of indices frequently used in Sociometry
The macroecology of phylogenetically structured hummingbird-plant networks
Aim To investigate the association between species richness, species' phylogenetic signal, insularity and historical and current climate with hummingbird-plant network structure. Location 54 communities along a c. 10,000 kilometer latitudinal gradient across the Americas (39ºN - 32ºS), ranging from sea level to c. 3700 m asl, located on the mainland and on islands, and covering a wide range of climate regimes. Methods We measured null-modeled corrected complementary specialization and bipartite modularity (compartmentalization) in networks of quantitative interactions between hummingbird and plant species. Using an ordinary least squares multi-model approach, we examined the influence of species richness, phylogenetic signal, insularity, and current and historical climate conditions on network structure. Results Phylogenetically-related species, especially plants, showed a tendency to interact with a similar array of partners. The spatial variation in network structure exhibited a constant association with species' phylogeny (R2=0.18-0.19). Species richness and environmental factors showed the strongest associations with network structure (R2=0.20-0.44; R2138 =0.32-0.45, respectively). Specifically, higher levels of complementary specialization and modularity were associated to species-rich communities and communities in which closely-related hummingbirds visited distinct sets of flowering species. On the mainland, warmer temperatures and higher historical temperature stability associated to higher levels of complementary specialization. Main conclusions Previous macroecological studies of interaction networks have highlighted the importance of environment and species richness in determining network structure. Here, for the first time, we report an association between species phylogenetic signal and network structure at macroecological scale. Specifically, null model corrected complementary specialization and modularity exhibited a positive association with species richness and a negative association with hummingbird phylogenetic signal, indicating that both high richness and high inter-specific competition among closely-related 150 hummingbirds exhibit important relationships with specialization in hummingbird-plant networks. Our results document how species richness, phylogenetic signal and climate associate with network structure in complex ways at macroecological scale
Search for Anomalous Couplings in the Higgs Sector at LEP
Anomalous couplings of the Higgs boson are searched for through the processes
e^+ e^- -> H gamma, e^+ e^- -> e^+ e^- H and e^+ e^- -> HZ. The mass range 70
GeV < m_H < 190 GeV is explored using 602 pb^-1 of integrated luminosity
collected with the L3 detector at LEP at centre-of-mass energies
sqrt(s)=189-209 GeV. The Higgs decay channels H -> ffbar, H -> gamma gamma, H
-> Z\gamma and H -> WW^(*) are considered and no evidence is found for
anomalous Higgs production or decay. Limits on the anomalous couplings d, db,
Delta(g1z), Delta(kappa_gamma) and xi^2 are derived as well as limits on the H
-> gamma gamma and H -> Z gamma decay rates
Nutrición enteral domiciliaria en España: registro Nadya del año 2011-2012
Objective: To describe the results of the home enteral
nutrition (HEN) registry of the NADYA-SENPE group in
2011 and 2012.
Material and methods: We retrieved the data of the patients
recorded from January 1st 2011 to December 31st 2012.
Results: There were 3021 patients in the registry
during the period from 29 hospitals, which gives 65.39 per
million inhabitants. 97.95% were adults, 51.4% male.
Mean age was 67.64 ± 19.1, median age was 72 years for
adults and 7 months for children. Median duration with
HEN was 351 days and for 97.5% was their first event
with HEN. Most patients had HEN because of neurological
disease (57.8%). Access route was nasogastric tube
for 43.5% and gastrostomy for 33.5%. Most patients had
limited activity level and, concerning autonomy, 54.8%
needed total help. Nutritional formula was supplied from
chemist’s office to 73.8% of patients and disposables,
when necessary, was supplied from hospitals to 53.8% of
patients. HEN was finished for 1,031 patients (34.1%)
during the period of study, 56.6% due to decease and
22.2% due to recovery of oral intake.
Conclusions: Data from NADYA-SENPE registry
must be explained cautiously because it is a non-compulsory
registry. In spite of the change in the methodology of
the registry in 2010, tendencies regarding HEN have been
maintained, other than oral routeObjetivos: Describir los resultados del registro de nutrición
enteral domiciliaria (NED) del grupo NADYASENPE
de los años 2011 y 12.
Material y métodos: Se recopilaron los datos introducidos
en el registro desde el 1 de enero de 2011 al 31 de diciembre
de 2012.
Resultados: Hubo 3021 pacientes en el registro durante
el periodo, procedentes de 29 hospitales, lo que da una
prevalencia de 65,39 casos por millón de habitantes.
97.95% fueron adultos, 51,4% varones. La edad media
fue 67,64 ± 19,1 años y la mediana 72 años para los adultos
y 7 meses para los niños. La duración media de la NED
fue 351 días y para el 97,5% fue el primer episodio con
NED. La mayoría de pacientes tenían NED por una enfermedad
neurológica (57,8%). La vía de acceso fue sonda
nasogástrica para el 43,5% y gastrostomía para el 33,5%.
La mayoría de pacientes tuvieron un nivel de actividad física
limitado y, respecto a la autonomía, 54,8% necesitaba
ayuda total. La fórmula de nutrición se suministró desde
las oficinas de farmacia para el 73,8% y los fungibles,
cuando fueron necesarios, desde los hospitales para el
53,8%. La NED se suspendió en 1.031 pacientes (34,1%)
durante el periodo de estudio, 56,6% debido a fallecimiento
y 22,2% debido a recuperación de la vía oral.
Conclusiones: Los datos del registro NADYA-SENPE
deben ser interpretados con precaución ya que se trata de
un registro voluntario. A pesar del cambio de metodología
del registro en 2010, las tendencias en NED se han mantenido,
salvo la importancia cuantitativa de la vía ora
Charge separation relative to the reaction plane in Pb-Pb collisions at TeV
Measurements of charge dependent azimuthal correlations with the ALICE
detector at the LHC are reported for Pb-Pb collisions at TeV. Two- and three-particle charge-dependent azimuthal correlations in
the pseudo-rapidity range are presented as a function of the
collision centrality, particle separation in pseudo-rapidity, and transverse
momentum. A clear signal compatible with a charge-dependent separation relative
to the reaction plane is observed, which shows little or no collision energy
dependence when compared to measurements at RHIC energies. This provides a new
insight for understanding the nature of the charge dependent azimuthal
correlations observed at RHIC and LHC energies.Comment: 12 pages, 3 captioned figures, authors from page 2 to 6, published
version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/286
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