320 research outputs found
Dissociative electron attachment to the H2O molecule. I. Complex-valued potential-energy surfaces for the 2B1, 2A1, and 2B2 metastable states of the water anion
We present the results of calculations defining global, three-dimensional
representations of the complex-valued potential-energy surfaces of the doublet
B1, doublet A1, and doublet B2 metastable states of the water anion that
underlie the physical process of dissociative electron attachment to water. The
real part of the resonance energies is obtained from configuration-interaction
calculations performed in a restricted Hilbert space, while the imaginary part
of the energies (the widths) is derived from complex Kohn scattering
calculations. A diabatization is performed on the 2A1 and 2B2 surfaces, due to
the presence of a conical intersection between them. We discuss the
implications that the shapes of the constructed potential-energy surfaces will
have upon the nuclear dynamics of dissociative electron attachment to H2O.
This work originally appeared as Phys Rev A 75, 012710 (2007). Typesetting
errors in the published version have been corrected here.Comment: Corrected version of PRA 75, 012710 (2007
OPTIMIZATION OF A PULTRUSION PROCESS USING FINITE DIFFERENCE AND PARTICLE SWARM ALGORITHMS
Idiopathic Pulmonary Fibrosis (IPF) incidence and prevalence in Italy
Background: Studies of Idiopathic Pulmonary Fibrosis (IPF) epidemiology show regional variations of
incidence and prevalence; no epidemiological studies have been carried out in Italy. Objective: To determine incidence
and prevalence rates of IPF in the population of a large Italian region.Methods: in this cross-sectional study
study data were collected on all patients of 18 years of age and older admitted as primary or secondary idiopathic
fibrosing alveolitis (ICD9-CM 516.3) to Lazio hospitals, from 1/1/2005 to 31/12/2009, using regional hospital
discharge, population and cause of death databases. Reporting accuracy was assessed on a random sample of hospital
charts carrying the ICD9-CM 516.3, 516.8, 516.9 and 515 codes, by reviewing radiology and pathology
findings to define cases as IPF âconfidentâ, âpossibleâ or âinconsistentâ. Results: Annual prevalence and incidence
of IPF were estimated at 25.6 per 100,000 and 7.5 per 100,000 using the ICD9-CM code 516.3 without chart
audit while they were estimated at 31.6 per 100,000 and at 9,3 per 100,000 for the IPF âconfidentâ definition after
hospital chart audit. Conclusion: The data provide a first estimate of IPF incidence in Italy and indicate that incidence
and prevalence in southern European regions may be similar to those observed in northern Europe and
North America. (Sarcoidosis Vasc Diffuse Lung Dis 2014; 31: 191-197
Going, Going, Gone: A Feminist Bourdieusian Analysis of Young Women's Trajectories in, Through and Out of Physics, Age 10â19
This chapter draws on longitudinal interview data collected from seven young woman in England who were tracked from age 10â19 and who had all expressed an aspiration at age 16 to study Advanced level (A level) physics. Applying a feminist Bourdieusian conceptual lens, we explore their trajectories in, through and out of physics: from Danielle, who is denied entry to A level physics; to Victoria and Thalia, who are debarred from the course before completion; to Davina, Kate and Mienie, who complete the A level but who choose not to pursue the subject further; and finally Hannah, who goes on to study physics at university. Attention is drawn to the pedagogic work conducted by the field of physics, notably the cultivation of habitus and hexis through the bodies, minds and identities of the young women, and its stringent gate-keeping practices, which ensure the reproduction of the elite status of the field and the simultaneous disadvantaging of women
Recommended from our members
Disorientating, fun or meaningful? Disadvantaged families' experiences of a science museum visit
It is widely agreed that there is a need to increase and widen science partici- pation. Informal science learning environments (ISLEs), such as science museums, may provide valuable spaces within which to engage visitorsâyet the visitor profile of science museums remains narrow. This paper seeks to understand the experiences of socially disadvantaged families within such spaces. Using a Bourdieusian analytic lens, we analyse qualitative data from a small study conducted with ten parents and ten children from an urban school who visited a large science museum. Data includes pre- and post-interviews, audio recordings and visit fieldnotes. We characterised familiesâ experiences as falling into three discourses, as âdisorientatingâ, âfunâ or âmeaningfulâ visits. Analysis identifies how the familiesâ experiences, and the likelihood of deriving science learning from the visit, were shaped through interactions of habitus and capital. Implications for improving equity and inclusion within ISLEs are discussed
Recommended from our members
Minority ethnic students and science participation: a qualitative mapping of achievement, aspiration, interest and capital
In the UK, the âleaky pipelineâ metaphor has been used to describe the relationship between ethnicity and science participation. Fewer minority ethnic students continue with science in post-compulsory education, and little is known about the ways in which they participate and identify with science, particularly in the secondary school context. Drawing on an exploratory study of 46 interviews and 22 h of classroom observations with British students (aged 11â14) from Black Caribbean, Bangladeshi, Pakistani, Indian and Chinese ethnic backgrounds, this paper identified five âtypesâ of science participation among minority ethnic students. The five types of science participation emerged from an analysis of studentsâ science achievement, science aspiration, science interest and science capital. The characteristics of the five types are as follows: Science adverse students have no aspirations towards science and lacked interest, achievement and capital in science. Science intrinsic students have high science aspirations, interest and capital but low science attainment. Students who are science intermediate have some aspirations, interest and capital in science, with average science grades. Science extrinsic students achieve highly in science, have some science capital but lacked science aspirations and/or interest. Science prominent students are high science achievers with science aspirations, high levels of interest and capital in science. The findings highlight that minority ethnic students participate in science in diverse ways. Policy implications are suggested for each type as this paper provides empirical evidence to counter against public (and even some academic) discourses of minority ethnic students as a homogeneous group
Why do students in STEM higher education programmes drop/opt out?:explanations offered from research
Desempenho de hĂbridos de linhagens parcialmente endogĂąmicas de milho em regiĂ”es dos estados de Roraima e Minas Gerais
An examination of Melodyâs identities, contexts, and learning in a US science classroom: implications for science education of Asian transnational students
Relative Unidirectional Translation in an Artificial Molecular Assembly Fueled by Light
- âŠ