Results overview: Found 8 records in 0.02 seconds.
Articles, 8 records found
Articles 8 records found  
1.
18 p, 281.7 KB Periodic orbits of the planar anisotropic Manev problem and of the perturbed hydrogen atom problem / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Yuan, Pengfei (Southwest University. School of Mathematics and Statistics (China))
In this paper we use the averaging theory for studying the periodic solutions of the planar anisotropic Manev problem and of two perturbations of the hydrogen atom problem. When a convenient parameter is sufficiently small we prove that for every value e∈ (0, 1) a unique elliptic periodic solution with eccentricity e of the Kepler problem can be continued to the mentioned three problems.
2019 - 10.1007/s12346-019-00322-y
Qualitative Theory of Dynamical Systems, Vol. 18, Issue 3 (December 2019) , p. 969-986  
2.
10 p, 4.7 MB Phonon engineering in isotopically disordered silicon nanowires / Mukherjee, Samik (Polytechnique Montréal. Département de génie physique) ; Givan, U. (Max-Planck-Institut für Mikrostrukturphysik) ; Senz, S. (Max-Planck-Institut für Mikrostrukturphysik) ; Bergeron, A. (Polytechnique Montréal. Département de génie physiquel) ; Francoeur, S. (Polytechnique Montréal. Département de génie physique) ; De La Mata, Maria (Institut Català de Nanociència i Nanotecnologia) ; Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia) ; Sekiguchi, T. (Keio University. Department of Applied Physics and Physico-Informatics) ; Itoh, K.M. (Keio University. Department of Applied Physics and Physico-Informatics) ; Isheim, D. (Northwestern University. Department of Materials Science and Engineering) ; Seidman, D.N. (Northwestern University. Department of Materials Science and Engineering) ; Moutanabbir, Oussama (Polytechnique Montréal. Département de génie physique)
The introduction of stable isotopes in the fabrication of semiconductor nanowires provides an additional degree of freedom to manipulate their basic properties, design an entirely new class of devices, and highlight subtle but important nanoscale and quantum phenomena. [...]
2015 - 10.1021/acs.nanolett.5b00708
Nano letters, Vol. 15, issue 6 (Oct. 2015) , p. 3885-3893  
3.
20 p, 411.5 KB The symmetric periodic orbits for the two-electron atom / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Tonon, Durval José. (University of Goiás (Brasil). Institute of Mathematics and Statistics of Federal)
We analyse the existence of periodic symmetric orbits of the classical helium atom. The results obtained shows that there exists six families of periodic orbits that can be prolonged from a continuum of periodic symmetric orbits. [...]
2018 - 10.1007/s11005-018-1056-1
Letters in mathematical physics, Vol. 108, issue 8 (2018) , p. 1851-1871  
4.
4 p, 307.5 KB Hydrogen desorption in SiGe films : a diffusion limited process / Vizoso San Segundo, Jesús (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica) ; Suñé, Jordi, 1963- (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica) ; Martín, Ferran, (Martín Antolín) (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica) ; Nafría i Maqueda, Montserrat (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica) ; American Physical Society
A model to explain the hydrogen desorption kinetics in SiGe alloys is presented. This is an extension of a previous desorption model of hydrogen from Si, that considers the presence of three dimer types in the surface in which hydrogen atoms tend to pair before the desorptionreaction. [...]
1997 - 10.1063/1.118429
Applied physics letters, Vol. 70, Issue 24 (June 1997) , p. 3287-3289  
5.
4 p, 445.8 KB Nanocalorimetric analysis of the ferromagnetic transition in ultrathin films of nickel / Lopeandía Fernández, Aitor (Universitat Autònoma de Barcelona. Departament de Física) ; Pi, F. (Pi i Vila, Francesc) (Universitat Autònoma de Barcelona. Departament de Física) ; Rodriguez-Viejo, Javier (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We report on in situheat capacity measurements (370-800K) using quasiadiabatic ultrafast differential scanning nanocalorimetry in thin films(1-200nm) of Nigrown by electron beam evaporation. The heat capacity shows a broad peak with a rounded maximum that is attributed to the decrease of long-range interactions in the ferromagnetic to paramagnetic phase transition of Ni. [...]
2008 - 10.1063/1.2901166
Applied physics letters, Vol. 92, Issue 12 (March 2008) , p. 122503  
6.
10 p, 152.6 KB Anàlisi dels llibres de text del pare Vitoria com a exemple de la incorporació progressiva de les innovacions científiques al camp docent / Marzàbal Blancafort, Ainoa (Universitat Autònoma de Barcelona. Departament de Didàctica de la Matemàtica i de les Ciències Experimentals)
This article is an analysis of one of the textbooks written and used by Eduardo Vitoria in the Institut Químic de Sarrià during the first half of 20th century, in a context where the learning of chemistry was based on experimentation, and where we could see a great effort to incorporate as quickly as possible the scientific innovations relative to the atomic model.
2008
Actes d'Història de la Ciència i de la Tècnica, Vol. 1, Núm. 2 (2008) , p. 59-67  
7.
5 p, 241.6 KB La reacción química : descripciones e interpretaciones de los alumnos de liceo / Chastrette, M. ; Franco, M.
We have carried out a piece of research about the assimilation of the chemical reaction by secondary students, based on the study of their spontaneous descriptions of the process, their ability to explain it in corpuscular terms and of correctly applying the law of matter preservation. [...]
1991
Enseñanza de las ciencias, V. 9 n. 3 (1991) p. 243-247  
8.
18 p, 2.4 MB Atomismo versus energetismo : controversia científica a finales del siglo XIX / Moreno González, Antonio
Los aprendizajes sobre la naturaleza atómica de la materia, en los niveles primarios, secundarios y también universitarios, son equívocos, porque están centrados sólo en la evolución de los modelos atómicos a lo largo de la historia, como si desde el origen de los tiempos nadie hubiera puesto en entredicho esa naturaleza corpuscular. [...]
Learning on the atomic nature of matter is often equivocal in primary, secondary and universities too, due to the fact that they are focused on the evolution of the diverse atomic models throughout history, as if no one had ever questioned the corpuscular nature at stake. [...]

2006
Enseñanza de las ciencias, V. 24 n. 3 (2006) p. 411-428  

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