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Front form and point form formulation of predictive relativistic mechanics. Noninteraction theorems
(1986-02)
Article
Open AccessThe front form and the point form of dynamics are studied in the framework of predictive relativistic mechanics. The noninteraction theorem is proved when a Poincare-invariant Hamiltonian formulation with canonical position ... -
Homothetic motions and Newtonian cosmology
(2014-05-07)
Article
Restricted access - publisher's policyWe construct a homothetic covariant Newtonian gravitation theory which unifies inertial homothetic forces and gravitational fields. This is achieved through an equivalence principle based on a local homothetic frame of ... -
A conceptual discussion on electromagnetic units - Extending mechanical units towards a global system of units
(2014-05)
Article
Restricted access - publisher's policyA comparative review of the different systems of units that are most usual in electromagnetism leads to the proposal of a new system of units. In this system, the gravitational constant acquires the role of an interaction ... -
Una ojeada al terrorismo nuclear
(2013)
Article
Open Access -
Rigid motions and generalized Newtonian gravitation
(2013-08-01)
Article
Restricted access - publisher's policyIn an effort to contribute to a better understanding of General Relativity, here we lay the foundations of generalized Newtonian gravity, which unifies inertial forces and gravitational fields. We also formulate a kind ... -
Comparative study of three audio processors as environments for laboratory activities on wave physics and acoustics
(2013-08)
Article
Restricted access - publisher's policyAudio processors allow to implement laboratory activities specially on acoustics. We have evaluated three audio processors (Audacity, WaveLab, and Adobe Audition). Although an overall grade was also calculated as a ... -
Misconceptions about sound among engineering students
(2012)
Article
Open AccessOur first objective was to detect misconceptions about the microscopic nature of sound among senior university students enrolled in different engineering programmes (from chemistry to telecommunications). We sought to ... -
Refredament magnètic: ordre i desordre d'imants atòmics
(2011)
Article
Open AccessS’ha comprovat que la refrigeració magnètica que utilitza un sistema magnètic és energèticament eficient i competitiva amb la tecnologia refrigerant basada en la compressió de gasos en el rang de temperatures proper a ... -
Modelos mentales alternativos de los alumnos de segundo curso de Ingeniería sobre la ley de Coulomb y el campo eléctrico
(2010-05)
Article
Open AccessEl presente estudio tiene como objetivo identificar los modelos mentales que aplican los estudiantes al iniciar el segundo curso de ingeniería cuando utilizan la Ley de Coulomb y el concepto de campo eléctrico para interpretar ... -
Dielectric characterization of alcoholic beverages and solutions of ethanol in water under microwave radiation in the 1–20 GHz range
(2010-07)
Article
Restricted access - publisher's policy -
Magnetic susceptibility of sodium rare-rarth fluorites Na[sub 0.5 -- x]R[sub 0.5 + x]F[sub 2 + 2x] (R [equals sign] Dy, Ho, Er, Tm, Yb) and some ordered phases
(2001-05)
Article
Restricted access - publisher's policy—Magnetic properties of the nonstoichiometric phases with the fluorite-type “defect” structure Na 0.4 R 0.6 F 2.2 ( R = Ho, Er, Tm, Yb) and Na 0.35 Dy 0.65 F 2.3 have been studied as well as some ordered ... -
Audio processors as a learning tool for basic acoustics
(2009-01)
Article
Open AccessBasing on the audio processor Audacity, this paper presents the use of this kind of programs as a so called “hear-and-see” learning tool for basic acoustics. Some activities designed as laboratory experiments, which can ...
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