Search results for "Principle"
showing 10 items of 1023 documents
Resolvent estimates for the magnetic Schrödinger operator in dimensions ≥2
2020
It is well known that the resolvent of the free Schrödinger operator on weighted L2 spaces has norm decaying like λ−12 at energy λ . There are several works proving analogous high frequency estimates for magnetic Schrödinger operators, with large long or short range potentials, in dimensions n≥3 . We prove that the same estimates remain valid in all dimensions n≥2 . peerReviewed
Influence on self-efficacy of the degree of authenticity of the inquiry carried out in two secondary school science projects
2021
Las creencias sobre la propia capacidad para llevar a cabo con exito una tarea concreta (autoeficacia) influyen en la implicacion y la motivacion hacia dicha tarea. En las ultimas decadas se ha incrementado el foco de atencion hacia estas creencias en el area de ciencias no solo como uno de los predictores mas consistentes del desempeno real del alumnado, sino por la existencia de desigualdades sistematicas en la autoeficacia de chicos y chicas. Aunque el Aprendizaje Basado en Proyectos (ABP) en el aula de ciencias posee diversas caracteristicas que potencialmente pueden contribuir a la mejoria de la autoeficacia en ciencias del alumnado, las evidencias entre la relacion de los elementos de…
THE VALIDATION OF A SELF-ASSESSMENT TOOL FOR THE TEACHER'S PRACTICES THAT EMBRACES THE NEURO-EDUCATIONAL APPROACH
2021
This contribution intends to present a study and research path that, starting from the theoretical framework of neuro-education, has led to the identification of five indicators (transversal area, socio-emotional-affective area, cognitive area, linguistic-communicative area, praxico-motor) on the basis of which a neuro-evaluation tool for teachers was built and validated: Self-assessment questionnaire of neuro-didactic and educational practices for teachers. Neuroscientific research is offering numerous points of reflection-action on the functioning of the brain and on how to modify the teaching and the educational proposal to improve the performance and growth of the person. However, the p…
A Variationally Consistent Time Modelling of Elastic-Plastic Constitutive Equations
1991
A general energy-based time discretization method for evolutive analysis is presented. Most known time integration procedures (mid-point rule, backward difference, etc.) are shown to be particular cases of it. For space continuous systems, a sequence of weighted boundary value problems of deformation-theory plasticity are obtained, each characterizable by a number of variational principles useful for finite element discretization.
A closed-form solution for natural frequencies of thin-walled cylinders with clamped edges
2016
Abstract This paper presents an approximate closed-form solution for the free-vibration problem of thin-walled clamped–clamped cylinders. The used indefinite equations of motion are classic. They derive from Reissner׳s version of Love׳s theory, properly modified with Donnell׳s assumptions, but an innovative approach has been used to find the equations of natural frequencies, based on a solving technique similar to Rayleigh׳s method, on the Hamilton׳s principle and on a proper constructions of the eigenfuctions. Thanks to the used approach, given the geometric and mechanical characteristics of the cylinder, the model provides the natural frequencies via a sequence of explicit algebraic equat…
Risks Associated with the Use of Garcinia as a Nutritional Complement to Lose Weight
2021
Nowadays, obesity is one of the great nutritional problems facing public health. The prevalence of this pathology has increased in a worrying way over recent years, currently reaching epidemic proportions. In this context, nutritional supplements are presented as a therapeutic alternative to which more and more people are turning to. Nutritional supplements to lose weight based on the Garcinia plant, specifically on Garcinia cambogia, are commonly used. The active principle of this plant to which these properties have been attributed, is hydroxycitric acid (HCA). The aim of the present review is to gather reported data concerning the effectiveness of nutritional supplements based on Garcini…
Le forme della sostenibilità
2021
Riflettere sulla sostenibilità vuol dire soffermarsi sulle ragioni all’origine dell’architettura, sulle modalità in cui stiamo sulla terra, sul rapporto con i luoghi, sul modo in cui costruiamo. Il pensiero sostenibile, dunque, deve partire da quei principi atemporali ai quali il progetto contemporaneo deve rispondere con soluzioni precise, in relazione alle necessità dell’abitare in questo tempo e in questi luoghi. Le forme della sostenibilità sono gli specifici esiti architettonici in risposta a un sistema complesso e variabile di questioni ambientali (la natura, il carattere dei luoghi in cui si insedia, la natura dei suoli, il paesaggio con cui si confronta), costruttive (la tradizione …
Pensare in bianco. Progettare in bianco
2018
A partire da tre esempi di architetture bianche contemporanee, il contributo ne propone una lettura di continuità con la tradizione mediterranea e con la più recente eredità dell’architettura moderna. Emergono alcuni elementi comuni tra le opere, sintomatici di una più ampia tendenza contemporanea che mira al recupero dei caratteri della mediterraneità.
Android tool to evaluate grounding resistance
2015
In the absence of sources of rapidly varying field, the study of the potential distribution determined, in a linear medium, by a geometrically complex grounding may be conducted by applying the method of superposition of the effects, known as method of subareas of Maxwell. Such approach can be usefully employed in an educational tool intended for students of electrical engineering.
Learning problem solving skills from demonstration: An architectural approach
2011
We present an architectural approach to learning problem solving skills from demonstration, using internal models to represent problem-solving operational knowledge. Internal forward and inverse models are initially learned through active interaction with the environment, and then enhanced and finessed by observing expert teachers. While a single internal model is capable of solving a single goal-oriented task, it is their sequence that enables the system to hierarchically solve more complex task. Activation of models is goal-driven, and internal ”mental” simulations are used to predict and anticipate future rewards and perils and to make decisions accordingly. In this approach intelligent …