Search results for "force"
showing 10 items of 3423 documents
A Non-Local Two Dimensional Foundation Model
2012
Classical foundation models such as the Pasternak and the Reissner models have been recently reformulated within the framework of non-local mechanics, by using the gradient theory of elasticity. To contribute to the research effort in this field, this paper presents a two-dimensional foundation model built by using a mechanically based non-local elasticity theory, recently proposed by the authors. The foundation is thought of as an ensemble of soil column elements resting on an elastic base. It is assumed that each column element is acted upon by a local Winkler-like reaction force exerted by the elastic base, by contact shear forces and volume forces due, respectively, to adjacent and non-…
Solution strategies for 1D elastic continuum with long-range interactions: Smooth and fractional decay
2010
Abstract An elastic continuum model with long-range forces is addressed in this study within the context of approximate analytical methods. Such a model stems from a mechanically-based approach to non-local theory where long-range central forces are introduced between non-adjacent volume elements. Specifically, long-range forces depend on the relative displacement, on the volume product between interacting elements and they are proportional to a proper, material-dependent, distance-decaying function. Smooth-decay functions lead to integro-differential governing equations whereas hypersingular, fractional-decay functions lead to a fractional differential governing equation of Marchaud type. …
Programmable assembly of peptide amphiphile via noncovalent-to-covalent bond conversion
2017
Controlling the number of monomers in a supramolecular polymer has been a great challenge in programmable self-assembly of organic molecules. One approach has been to make use of frustrated growth of the supramolecular assembly by tuning the balance of attractive and repulsive intermolecular forces. We report here on the use of covalent bond formation among monomers, compensating for intermolecular electrostatic repulsion, as a mechanism to control the length of a supramolecular nanofiber formed by self-assembly of peptide amphiphiles. Circular dichroism spectroscopy in combination with dynamic light scattering, size-exclusion chromatography, and transmittance electron microscope analyses r…
F4E load transfer procedure among finite element models different in topology or in discretization
2019
Abstract In this paper, a methodology developed in Fusion for Energy (F4E) for interpolating mechanical loads both between compatible (i.e. from solid to solid models different in discretization) and incompatible (e.g. from solid models to shell/beam models) FE models is described. This novel procedure is able of transferring a force vector field (i.e. Lorentz forces) from a three-dimensional solid mesh (e.g. electromagnetic model) onto a target mesh (e.g. mechanical model), being it either three-dimensional solid or simplified beam/shell model. This interpolation procedure is developed with the aim of preserving both the global and local mechanical equilibrium of the system in terms of res…
Highly Homogeneous 2D/3D Heterojunction Diodes by Pulsed Laser Deposition of MoS2 on Ion Implantation Doped 4H-SiC
2022
In this paper, 2D/3D heterojunction diodes have been fabricated by pulsed laser deposition (PLD) of MoS2 on 4H-SiC(0001) surfaces with different doping levels, i.e., n− epitaxial doping (≈1016 cm−3) and n+ ion implantation doping (>1019 cm−3). After assessing the excellent thickness uniformity (≈3L-MoS2) and conformal coverage of the PLD-grown films by Raman mapping and transmission electron microscopy, the current injection across the heterojunctions is investigated by temperature-dependent current–voltage characterization of the diodes and by nanoscale current mapping with conductive atomic force microscopy. A wide tunability of the transport properties is shown by the SiC surface dopi…
A method for evaluating rainfall kinetic power by a characteristic drop diameter
2019
Abstract Empirical relationships linking kinetic energy to rainfall intensity are commonly used to estimate rainfall erosivity. In this paper, using the drop-size distribution (DSD) proposed by Marshall and Palmer, a relationship for calculating the rainfall kinetic power was firstly deduced. This equation requires the simultaneous measurement of both the median volume diameter and the rainfall intensity and its application also reveals the drawback of needing the measurement of the whole DSD by an expensive disdrometric technique. Then, using a fictitious precipitation, which is both constituted by droplets having the same diameter (mean volume diameter) and having the same volume of the a…
Competencias personales y participativas vinculantes a la inserción laboral de los universitarios : Validación de una escala
2019
The big changes that take place in a social and productive context demand putting a set of competencies into action that relate to the same equation of training, orientation and employment are demanded. Faced with this growing commitment of employability, the aim of this paper is to describe the construction of a scale of competencies for university students on entering the workforce and analyze the validity of construct of said scale. 931 final year undergraduate students from the University of Murcia and the University of Granada participated. For the collection of information and analysis of the data, a mixed methodology was applied which allows, on the one hand, to design the scale of c…
Toward a Model of Workforce Training and Development
2019
In the modern, ever-changing world, both employers and employees are struggling in keeping their competitive advantage. Previous studies have recognised that both formal instruction and informal learning are needed to gain and maintain competence. The famous 70-20-10 model states that only 10 per cent of learning occurs during the formal instruction. The challenge for the organisations is how the formal instruction can and should be provided to employees. In this paper, we constructed a model of Workforce Training and Development (WOTRA), based on the current learning theories, modes, methods, and models. WOTRA can be used by both employers and employees to choose an adequate mix of learnin…
Medical workforce planning in a changing health context: Comparison between Italy and Europe
2019
An increasing need for healthcare workers as been estimated worldwide. To provide a comprehensive framework of the medical workforce in Italy, we investigated the post-lauream medical workforce training supply and demand. Further, a comparison of the medical workforce between Italy and other European Countries with a similar epidemiological and/or demographic context was performed. The distribution of pre-and post-lauream medical educational providers and post-lauream resources in place in Italy was analyzed among Italian macro-areas in the academic years 2015-2016, 2016-2017 and 2017-2018.Italy and the European countries in study were compared in term of post-lauream funding and number of …
Identità, valore, prezzo: nuove proposte di analisi e comparazione sul mercato degli schiavi a Napoli in età moderna
2017
International audience; This article aims at studying the formation process of personal identities of men forced to work at the oar in Naples at the end of the 16th century in comparison with the Kingdom of Valencia at the beginning of the 17th. At that time, Naples and Valencia were two of the most important slave markets as well as trading cities of the Spanish Empire. The research will take into account two types of sources that have remained largely unexplored by historiography to date, and especially a book dating back to 1585 detailing the biographies of 657 slaves. This will make it possible to focus in depth on slaves identities and in particular on the estimation process regarding …