5,680 research outputs found
Spin polarized current and Andreev transmission in planar superconducting/ferromagnetic Nb/Ni junctions
We have measured the tunnelling current in Nb/NbO/Ni planar tunnel
junctions at different temperatures. The junctions are in the intermediate
transparency regime. We have extracted the current polarization of the
metal/ferromagnet junction without applying a magnetic field. We have used a
simple theoretical model, that provides consistent fitting parameters for the
whole range of temperatures analyzed. We have also been able to gain insight
into the microscopic structure of the oxide barriers of our junctions.%Comment: 12 pages, 6 figure
Molecular studies of the brazilian infectious bronchitis virus isolates.
Avian infectious bronchitis virus (IBV) isolates have been widely characterized by reverse transcription followed by polymerase chain reaction and DNA sequencing. In present study, these techniques were applied to three viral genomic regions comprising the complete and/or a partial S1 segment, S2 and nucleocapsid genes. DNA sequences from viral isolates obtained from 1972 to 1989 and from 2006 to 2008 were compared. High similarity (>90%) was observed among some of the genomic segments, including S1 hypervariable region, which could suggest a common origin or ancestry. DNA sequences from S2 and N protein genes obtained from different infected tissues of the same flock were analyzed, and a clear segregation between respiratory and intestinal tract was observed. Therefore, these data suggest cocirculation of more than one viral strain in the same flock. 57.1% of DNA sequences from the S1 complete segment samples, 53.3% from the S2 fragment and 62.5% from the partial N gene were found to be different from analyzed sequences from reference strains leading to the conclusion that parte of viral isolates included in this study may be considered region specific. Considering the simultaneous analysis of the three genes, a large IBV genetic profile was observed in both old and recent isolates groups. However, most prominent diversity between viral isolates was obtained in the period from 1972 and 1989, showing the presence of a large number of variants in the state of Minas Gerais before the official approval of vaccination (1980)
Leveraging Experiential Learning to Foster University Studentsâ Proficiency in Engaging with People with Disabilities
Study purpose. Inclusive education, acknowledged as a fundamental human right, is aimed at enhancing the participation of all students and mitigating social and educational exclusion. Physical Education is identified as a vital instrument that fosters specific training on disability and inclusion, thereby ameliorating attitudes towards disability. The objective of this study is to scrutinize the perception of experiential learning and inclusive physical activity among students.
Materials and methods. An inclusive physical activity program for students pursuing a degree in Early Childhood and Primary Education was designed. The program proposes five sessions of inclusive physical activity and accommodates 30 adult users with intellectual disability. To analyse the reliability and validity of a scale that measures studentsâ perception of experiential learning, descriptive statistics, reliability analysis, exploratory and confirmatory factor analysis were used to assess the effectiveness and inclusivity of the scale.
Results. The validity and reliability of a scale that facilitates the analysis of studentsâ perceptions of learning derived from inclusive experiences is presented and the results are adequate for its usability. In addition, it is shown that experiential learning increases the perception towards the acquisition of disability-related competences among university students.
Conclusions. This scale essentially allows a comprehensive analysis of studentsâ perception of learning that emerges from inclusive experiences. It is demonstrated that experiential learning enhances studentsâ perception regarding the attainment of competencies related to disability. These findings underscore the importance of inclusive learning experiences in the training of future educators
AnĂĄlisis de la relevancia y factibilidad de indicadores de calidad en las unidades de nutriciĂłn
IntroducciĂłn: La evaluaciĂłn de la calidad en las actividades
sanitarias exige la elecciĂłn de unos indicadores
acordes con los resultados que queremos medir. De todos
los posibles, debemos priorizar aquellos que nos permitan
obtener la informaciĂłn mĂĄs relevante sin sobrecargar el
trabajo habitual de nuestras Unidades.
Objetivo: Conocer la opiniĂłn de los socios de SENPE
respecto a la relevancia y la viabilidad del uso de una
selecciĂłn de indicadores de calidad para su aplicaciĂłn en
nutriciĂłn clĂnica.
MĂ©todos: Encuesta remitida mediante correo electrĂłnico
a los socios de SENPE solicitando a los mismos su
opiniĂłn sobre 12 indicadores de calidad, valorĂĄndose
cada uno en cuanto a su relevancia y factibilidad de la
aplicaciĂłn en su medio.
Resultados: Contestaron 40 encuestados de 40 centros
diferentes de 12 comunidades autĂłnomas. En general, los
indicadores fueron considerados mĂĄs relevantes que factibles.
Los indicadores mejor puntuados fueron: âidentificaciĂłn
en las bolsas de nutriciĂłn artificialâ, âposiciĂłn
semi-incorporada del paciente con nutriciĂłn enteral por
sonda nasogĂĄstricaâ y âprotocolos clĂnicos bĂĄsicosâ. Considerando
los indicadores por grupos (de estructura, proceso
o resultado) los mejor valorados fueron: âidentificaciĂłn
del paciente en las bolsas de nutriciĂłn artificialâ
(estructura), âposiciĂłn semi-incorporadaâ y âprotocolos
clĂnicos bĂĄsicosâ (proceso), y âcumplimiento del objetivo
calĂłricoâ (resultado).
ConclusiĂłn: Los resultados de la encuesta permiten
seleccionar indicadores prioritarios para su aplicaciĂłn en
las Unidades de NutriciĂłnIntroduction: The quality assessment in health activities
requires the choice of indicators in line with the
results we want to measure. Of all possible, we should prioritize
those that allow us to obtain the most relevant
information without overloading the regular work of our
units.
Objective: To determine the opinion of the members of
SENPE regarding the relevance and feasibility of using a
selection of quality indicators designed for use in clinical
nutrition.
Methods: E-mail survey sent to members of SENPE
asking them their views on 12 quality indicators, evaluating
each in terms of their relevance and feasibility of
implementation in their environment.
Results: 40 respondents answered from 40 centers in 12
different regions. In general, the indicators were considered
more relevant than feasible. The indicators best
rated were: âidentification in artificial nutrition bags,
âsemi-recumbent position in patient with nasogastric
tube feedingâ and âbasic clinical protocolsâ. Considering
the type of indicator: âpatient identification in the bags of
artificial nutrition (structure),â a semi-incorporated
âandâ basic clinical protocols (process), and âfulfillment
of the caloric goalâ (result).
Conclusion: The results of the survey can make a selection
of indicators that could be considered for first-line
introduction in a Nutrition Uni
Search for the standard model Higgs boson in the H to ZZ to 2l 2nu channel in pp collisions at sqrt(s) = 7 TeV
A search for the standard model Higgs boson in the H to ZZ to 2l 2nu decay
channel, where l = e or mu, in pp collisions at a center-of-mass energy of 7
TeV is presented. The data were collected at the LHC, with the CMS detector,
and correspond to an integrated luminosity of 4.6 inverse femtobarns. No
significant excess is observed above the background expectation, and upper
limits are set on the Higgs boson production cross section. The presence of the
standard model Higgs boson with a mass in the 270-440 GeV range is excluded at
95% confidence level.Comment: Submitted to JHE
Search for New Physics with Jets and Missing Transverse Momentum in pp collisions at sqrt(s) = 7 TeV
A search for new physics is presented based on an event signature of at least
three jets accompanied by large missing transverse momentum, using a data
sample corresponding to an integrated luminosity of 36 inverse picobarns
collected in proton--proton collisions at sqrt(s)=7 TeV with the CMS detector
at the LHC. No excess of events is observed above the expected standard model
backgrounds, which are all estimated from the data. Exclusion limits are
presented for the constrained minimal supersymmetric extension of the standard
model. Cross section limits are also presented using simplified models with new
particles decaying to an undetected particle and one or two jets
Search for anomalous t t-bar production in the highly-boosted all-hadronic final state
A search is presented for a massive particle, generically referred to as a
Z', decaying into a t t-bar pair. The search focuses on Z' resonances that are
sufficiently massive to produce highly Lorentz-boosted top quarks, which yield
collimated decay products that are partially or fully merged into single jets.
The analysis uses new methods to analyze jet substructure, providing
suppression of the non-top multijet backgrounds. The analysis is based on a
data sample of proton-proton collisions at a center-of-mass energy of 7 TeV,
corresponding to an integrated luminosity of 5 inverse femtobarns. Upper limits
in the range of 1 pb are set on the product of the production cross section and
branching fraction for a topcolor Z' modeled for several widths, as well as for
a Randall--Sundrum Kaluza--Klein gluon. In addition, the results constrain any
enhancement in t t-bar production beyond expectations of the standard model for
t t-bar invariant masses larger than 1 TeV.Comment: Submitted to the Journal of High Energy Physics; this version
includes a minor typo correction that will be submitted as an erratu
Combined search for the quarks of a sequential fourth generation
Results are presented from a search for a fourth generation of quarks
produced singly or in pairs in a data set corresponding to an integrated
luminosity of 5 inverse femtobarns recorded by the CMS experiment at the LHC in
2011. A novel strategy has been developed for a combined search for quarks of
the up and down type in decay channels with at least one isolated muon or
electron. Limits on the mass of the fourth-generation quarks and the relevant
Cabibbo-Kobayashi-Maskawa matrix elements are derived in the context of a
simple extension of the standard model with a sequential fourth generation of
fermions. The existence of mass-degenerate fourth-generation quarks with masses
below 685 GeV is excluded at 95% confidence level for minimal off-diagonal
mixing between the third- and the fourth-generation quarks. With a mass
difference of 25 GeV between the quark masses, the obtained limit on the masses
of the fourth-generation quarks shifts by about +/- 20 GeV. These results
significantly reduce the allowed parameter space for a fourth generation of
fermions.Comment: Replaced with published version. Added journal reference and DO
Measurement of the t t-bar production cross section in the dilepton channel in pp collisions at sqrt(s) = 7 TeV
The t t-bar production cross section (sigma[t t-bar]) is measured in
proton-proton collisions at sqrt(s) = 7 TeV in data collected by the CMS
experiment, corresponding to an integrated luminosity of 2.3 inverse
femtobarns. The measurement is performed in events with two leptons (electrons
or muons) in the final state, at least two jets identified as jets originating
from b quarks, and the presence of an imbalance in transverse momentum. The
measured value of sigma[t t-bar] for a top-quark mass of 172.5 GeV is 161.9 +/-
2.5 (stat.) +5.1/-5.0 (syst.) +/- 3.6(lumi.) pb, consistent with the prediction
of the standard model.Comment: Replaced with published version. Included journal reference and DO
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