Low temperature scattering with the R-matrix method: the Morse potential

Experiments are starting to probe collisions and chemical reactions between atoms and molecules at ultra-low temperatures. We have developed a new theoretical procedure for studying these collisions using the R-matrix method. Here this method is tested for the atom -- atom collisions described by a Morse potential. Analytic solutions for continuum states of the Morse potential are derived and compared with numerical results computed using an R-matrix method where the inner region wavefunctions are obtained using a standard nuclear motion algorithm. Results are given for eigenphases and scattering lengths. Excellent agreement is obtained in all cases. Progress in developing a general procedure for treating ultra-low energy reactive and non-reactive collisions is discussed.Comment: 18 pages, 6 figures, 3 tables, conferenc

Determination of Lightning Currents from Far Electromagnetic Fields: Effect of a Strike Object

We discuss in this paper the influence of the presence of an elevated strike object on the peak of the lightning return stroke current determined from remote field measurements. We develop analytical expressions relating the lightning return stroke channel-base current and the far electromagnetic field for different specific cases, namely, (1) ground-initiated return strokes (classical transmission line (TL) model), (2) ground-initiated return strokes including possible reflections at ground level, (3) tall strike objects for which the current's zero-to-peak time is smaller than the travel time along the object, and (4) electrically short strike objects. It is shown that for tall structures, the field enhancement relative to a return stroke initiated at ground level is expressed through a factor equal to ktall = [1 + c / v (1 - 2 ρt)] / (1 - ρt), where v and c are the return stroke front speed and the speed of light in vacuum, respectively, and ρt is the top reflection coefficient. For very short towers and/or very slow return stroke current wavefronts, when the condition tf very much greater than h / c applies, expressions relating the far electromagnetic field and the return stroke current were also derived. For case (2), return strokes initiated at ground level, the field enhancement relative to a return stroke initiated at ground level, case (1), is expressed through a factor equal to kshort = (1 + (c / v) ρch - g) / (1 + ρch - g), where ρch-g represents the reflection coefficient between the lightning channel and the grounding impedance

Clinical forensic medicine in emergency departments: a pilot study of a forensic training and evaluation of its effectiveness in an Italian hospital

Because emergency departments are often the first point of contact for victims of violence, it is critical to provide the appropriate treatment in compliance with all necessary medicolegal precautions. For this reason, a randomized controlled trial was conducted at the Policlinico Hospital of Milan (Italy) in which an intervention group (12 physicians) received a 6-h course on clinical forensic medicine and their performance in medicolegal procedures in claimed cases of violence was compared with that of a control group (13 physicians) by means of a 16-item assessment scale over the 3 months before and the 3 months after the course. Overall, 195 medical records were included in the statistical analysis. Out of these cases, 105 occurred before the course (60 analyzed by the control group and 45 by the intervention group) and 90 occurred after the course (45 analyzed by the control group and 45 by the intervention group). The results showed that the overall mean score of physicians who participated to the course increased from 14.0 (IQR 7.0) to 19.0 (IQR 8.0) with a p-value < 0.0001 and that the comparison between the intervention group and the control group after the course was 19.0 (IQR = 8.0) and 14.0 (IQR = 7.0), respectively, with a p-value < 0.0001. The improvement was very little and below the expectations pointing out that educational courses, although they can be a first step towards raising the ED physicians’ awareness of clinical forensics, may not be enough and that more structured training and new strategies should be implemented

Toward detection of electron-hole pair excitation in H-atom collisions with Au(111): Adiabatic molecular dynamics with a semi-empirical full-dimensional potential energy surface.

We report an analytic potential energy surface (PES) based on several hundred DFT energies for H interacting with a Au(111) surface. Effective medium theory is used to fit the DFT data, which were obtained for the Au atoms held at their equilibrium positions. This procedure also provides an adequate treatment of the PES for displacements of Au atoms that occur during scattering of H atoms. The fitted PES is compared to DFT energies obtained from ab initio molecular dynamics trajectories. We present molecular dynamics simulations of energy and angle resolved scattering probabilities at five incidence angles at an incidence energy, Ei = 5 eV, and at a surface temperature, TS = 10 K. Simple single bounce trajectories are important at all incidence conditions explored here. Double bounce events also make up a significant fraction of the scattering. A qualitative analysis of the double-bounce events reveals that most occur as collisions of an H-atom with two neighboring surface gold atoms. The energy losses observed are consistent with a simple binary collision model, transferring typically less than 150 meV to the solid per bounce

O Profmat E A Formação Do Professor De Matemática: Uma Análise Curricular A Partir De Uma Perspectiva Processual E Descentralizadora

This paper analyzes the PROFMAT curriculum from the procedural and decentralized perspective of Sacristán (1998, 2013), adopting as references researches which aim was to study the teacher's knowledge needed to teach mathematics in basic school. Therefore, we analyzed: the academic project of this course; textbooks belonging to "PROFMAT Collection" used in the disciplines; data from classroom observation, the national schedule of disciplines; questionnaires answered by academics; and classroom assessments. From the analysis we conclude that there is no close connection between the elements that make up the PROFMAT curriculum and its intended goals, since these goals are not consubstantiated in the teaching material used in the classes, or in the curriculum modeling process by teachers and its development in the classroom, nor in the curriculum "accomplished" and "evaluated" especially because PROFMAT curriculum phases are not directly related to the math teacher of basic education practice.305690692

Reimagining Masculinity : Models of Masculinities in Italian Cisgender and Transgender Emerging Adults

Masculinities are defined as the repository of cultural and personal meanings attributed to men and boys. According to literature, masculinity ideals have an impact on how men behave. The present study aims at investigating how emerging adults interpret the concept of masculinity and embody and enact it. We were interested in understanding whether trans masculine and cisgender emerging adults conceptualized masculinity differently or similarly and whether they adopted different or similar strategies to act it out. To this aim, we conducted 6 focus groups with trans masculine (N = 16) and cisgender (N = 15) young adults. During the focus groups, participants discussed their concept of masculinity and how they embody and perform masculinity. Results showed that both groups identified social and bodily aspects in their conceptualization of masculinity. Although to varying extents, emerging adults were able to identify the limits of traditional models of masculinity. In both groups, markers for being recognized and affirming masculinity were found at both the bodily and social levels. Some peculiarities of the trans experience involve recognition of the privilege associated with masculinity, medicalized transition in order to achieve certain masculine markers, and a shift in perspective following social recognition of masculine identity

A comunicação e o ato de aprender e ensinar em sala de aula: refletindo sobre a disciplina de teoria e prática pedagógica do curso de Licenciatura em Matemática da Universidade Estadual de MaringáCommunication and an act of learning and teaching in the classroom: reflection on a discipline of theory and pedagogical practice of a course in Mathematics Degree of the State University of Maringá

O presente trabalho apresenta parte de pesquisa que teve por objetivo investigar o discurso e as práticas pedagógicas desenvolvidas nas aulas de Teoria e Prática Pedagógica ofertadas aos alunos do curso de Licenciatura em Matemática da Universidade Estadual de Maringá – UEM, a fim de verificar: a) qual tem sido a contribuição destas disciplinas no processo de construção dos saberes docentes e no desenvolvimento de práticas mais comunicativas e reflexivas em sala de aula e b) como o discurso dos professores formadores influencia a prática dos futuros professores. Isto porque a construção do conhecimento apoia-se, de maneira primordial, no uso de práticas que possibilitem aos discentes tornar públicos seus pensamentos, suas ideias, bem como comparar, negociar e modificar suas representações, concepções e crenças.The present work presents a part of a research developed in the Theory and Pedagogical Practice classes of the Mathematics Degree course of the State University of Maringá - UEM, in order to verify: a) what has been the contribution of these disciplines in the process of knowledge construction Teachers and in the development of a more communicative and reflexive pedagogical practice in the classroom. Taking into account the issues established for this study we developed a qualitative research focusing aspects of discourse analysis. The observation and analysis of these practices shows that the predominance of teacher discourse often does not allow moments and / or activities that allow students to rethink about a more communicative and reflexive pedagogical practice to be developed in the classroom

Charge-based continuous model for long-channel Symmetric Double-Gate Junctionless Transistors

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