Integrability and Quantum Phase Transitions in Interacting Boson Models

The exact solution of the boson pairing hamiltonian given by Richardson in the sixties is used to study the phenomena of level crossings and quantum phase transitions in the integrable regions of the sd and sdg interacting boson models.Comment: 5 pages, 5 fig. Erice Conferenc

A theoretical description of energy spectra and two-neutron separation energies for neutron-rich zirconium isotopes

Very recently the atomic masses of neutron-rich Zr isotopes, from $^{96}$Zr to $^{104}$Zr, have been measured with high precision. Using a schematic Interacting Boson Model (IBM) Hamiltonian, the evolution from spherical to deformed shapes along the chain of Zr isotopes, describing at the same time the excitation energies as well as the two-neutron separation energies, can be rather well reproduced. The interplay between phase transitions and configuration mixing of intruder excitations in this mass region is succinctly addressed.Comment: Accepted in European Journal of Physics

Factores Asociados a la Gingivitis en Gestantes en una Población Desfavorecida

Objective: The objective was to determine the factors associated with gingivitis in pregnant women who come to the health center in the district of San José de Sisa.  Methodology: The research was of a basic type and the research design was non-experimental, descriptive, cross-sectional and correlational.  The population and sample was the same as the population, that is, 110 pregnant women from the District of San José de Sisa with a non-probabilistic sampling for convenience to which a questionnaire of 5 questions on oral hygiene habits and sociodemographic factors and a clinical evaluation to observe the gingival state were provided.  Results: The study revealed that the associated factors were socioeconomic status where it was found that 43.5% at the mean level had gingivitis with a p value = 0.002, with reference to the age group 48.2% with gingival disease were between 20 and 29 years old with a p value = 0.280; 43.6% of pregnant women with gingivitis reported brushing at least 2 times a day when obtaining a p =0.098, el 41.7% in the second trimester presented gingivitis with a p value = 0.004. When comparing the information of the degree of instruction it was found that pregnant women with gingivitis were found that 40% had only primary and 39.1% secondary, when obtaining a p value = 0.000.  Conclusions: It concluded that there is a significant relationship between gingivitis and socioeconomic status (p=0.002), with the trimester of pregnancy (p=0.004), and with the degree of education of the pregnant woman (p=0.000); but found no statistical relationship with the age group (p=0.280) or with oral hygiene habits (p=0.098).Objetivo: El objetivo fue determinar los factores asociados a la gingivitis en las gestantes que acuden al centro de salud del distrito de San José de Sisa. Metodología: La investigación fue de tipo básica y el diseño de investigación fue no experimental, descriptivo, transversal y correlacional. La población y muestra, fue la misma que la población es decir 110 gestantes del Distrito de san José de Sisa con un muestreo no probabilístico por conveniencia a las cuales se les brindó un cuestionario de 5 preguntas sobre hábitos de higiene oral y factores sociodemográficos y una evaluación clínica para observar el estado gingival. Resultados: El estudio revelo que los factores asociados fueron el estatus socioeconómico en donde se encontró que el 43,5% al nivel medio tenían gingivitis con un p valor =0,002, con referencia al grupo etario el 48,2% con enfermedad gingival tenían entre 20 y 29 años con un p valor =0,280; el 43,6% de gestantes con gingivitis refirió cepillarse por lo menos 2 veces al día al obtener un p=0,098, el 41,7% en el segundo trimestre presentó gingivitis con un p valor =0,004. Al cotejar la información del grado de instrucción se encontró que las gestantes con gingivitis se encontraron que 40% tenían sólo primaria y 39,1% secundaria, al obtener un p valor =0,000. Conclusiones: Concluyó que existe relación significativa entre gingivitis y el nivel socioeconómico (p=0,002), con el trimestre de embarazo (p=0,004), y con el grado de instrucción de la gestante (p=0,000); pero no encontró relación estadística con el grupo etario (p=0,280) ni con los hábitos de higiene oral (p=0,098)

Type O pure radiation metrics with a cosmological constant

In this paper we complete the integration of the conformally flat pure radiation spacetimes with a non-zero cosmological constant $\Lambda$, and $\tau \ne 0$, by considering the case $\Lambda +\tau\bar\tau \ne 0$. This is a further demonstration of the power and suitability of the generalised invariant formalism (GIF) for spacetimes where only one null direction is picked out by the Riemann tensor. For these spacetimes, the GIF picks out a second null direction, (from the second derivative of the Riemann tensor) and once this spinor has been identified the calculations are transferred to the simpler GHP formalism, where the tetrad and metric are determined. The whole class of conformally flat pure radiation spacetimes with a non-zero cosmological constant (those found in this paper, together with those found earlier for the case $\Lambda +\tau\bar\tau = 0$) have a rich variety of subclasses with zero, one, two, three, four or five Killing vectors

Accurate detection of uniparental disomy and microdeletions by SNP array analysis in myelodysplastic syndromes with normal cytogenetics.

Progress in the management of patients with myelodysplastic syndromes (MDS) has been hampered by the inability to detect cytogenetic abnormalities in 40-60% of cases. We prospectively analyzed matched pairs of bone marrow and buccal cell (normal) DNA samples from 51 MDS patients by single nucleotide polymorphism (SNP) arrays, and identified somatically acquired clonal genomic abnormalities in 21 patients (41%). Among the 33 patients with normal bone marrow cell karyotypes, 5 (15%) had clonal, somatically acquired aberrations by SNP array analysis, including 4 with segmental uniparental disomies (UPD) and 1 with three separate microdeletions. Each abnormality was detected more readily in CD34+ cells than in unselected bone marrow cells. Paired analysis of bone marrow and buccal cell DNA from each patient was necessary to distinguish true clonal genomic abnormalities from inherited copy number variations and regions with apparent loss of heterozygosity. UPDs affecting chromosome 7q were identified in two patients who had a rapidly deteriorating clinical course despite a low-risk International Prognostic Scoring System score. Further studies of larger numbers of patients will be needed to determine whether 7q UPD detected by SNP array analysis will identify higher risk MDS patients at diagnosis, analogous to those with 7q cytogenetic abnormalities

ONOMATOPOEIA: LIFE EXPERIENCES OF POETS ON EXPRESSING AGGRESSION

People engaged in writing and performing poetry as a way of expressing their emotions is a rising phenomenon. The study aimed to know the life experiences of poets in coping with aggression through poetry writing. As well as to know if there is a significant data that will prove the existence of the aggression that motivates poets to write. The study utilized the qualitative design it’s an inquiry process of understanding based on particular distinct methodological traditions on request that investigate a social or human problem, under the Qualitative design the researchers used the Case Study method The respondents of the study were two female and two male poetry writers, 18 years old and above and who writes poetry for at least 3 years, and has an average deviation / average score from the Buss-Perry Aggression test. The researchers conducted the study on different cities in the National Capital Region. The researchers were able to come up with the following themes; (1) Personal experiences (2) Social experiences (3) Coping mechanisms. These themes shows the lived experiences of the poets in dealing with aggression by using poetry as a mechanism in coping up with the different aspects of life that significantly contributes to their aggression. We recommend for future researchers to utilize different approaches and expand the scope of this research.&nbsp

Obtaining a class of Type O pure radiation metrics with a cosmological constant, using invariant operators

Using the generalised invariant formalism we derive a class of conformally flat spacetimes whose Ricci tensor has a pure radiation and a Ricci scalar component. The method used is a development of the methods used earlier for pure radiation spacetimes of Petrov types O and N respectively. In this paper we demonstrate how to handle, in the generalised invariant formalism, spacetimes with isotropy freedom and rich Killing vector structure. Once the spacetimes have been constructed, it is straightforward to deduce their Karlhede classification: the Karlhede algorithm terminates at the fourth derivative order, and the spacetimes all have one degree of null isotropy and three, four or five Killing vectors.Comment: 29 page