Search results for " Push."
showing 10 items of 51 documents
Analytical prediction of the shear connection capacity in composite steel–concrete trussed beams
2016
Steel–concrete trussed composite beams are a particular types of composite girders constituted by a steel truss embedded in a concrete core. The truss is typically composed by a steel plate or a precast concrete slab working as bottom chord while coupled rebars are generally used to form the upper chord. Moreover, a system of ribbed or smooth steel rebars welded to the plate and forming the diagonals of the truss, works as web reinforcement. In the present study, the attention is focused on the evaluation of the shear resistance of the connection between bottom steel plate (the bottom chord) and concrete core through the diagonal bars of the truss developing a mechanical model able to accou…
The migrant crisis in the Mediterranean Sea: Empirical evidence on policy interventions
2021
Abstract This paper presents a novel set of empirical evidence to explore several hypotheses regarding the migrant crisis in the Mediterranean Sea. The political instability in transit countries, such as Libya, that made pre-existent repatriation policies ineffective, called for several search-and-rescue operations in the Mediterranean, which in turn have been wrongly accused of fostering illegal immigration and increasing deaths at sea. The empirical results show that the main determinants of the departures are several root causes at the departing African countries, underlining the importance of fighting human smuggling networks. The paper suggests a change in migration studies’ perspectiv…
A description based on languages of the final non-deterministic automaton
2014
The study of the behaviour of non-deterministic automata has traditionally focused on the languages which can be associated to the different states. Under this interpretation, the different branches that can be taken at every step are ignored. However, we can also take into account the different decisions which can be made at every state, that is, the branches that can be taken, and these decisions might change the possible future behaviour. In this case, the behaviour of the automata can be described with the help of the concept of bisimilarity. This is the kind of description that is usually obtained when the automata are regarded as labelled transition systems or coalgebras. Contrarily t…
Nonlinear Analysis of Reinforced Concrete Frames: Safety Evaluation and Retrofitting Techniques
Upper body strength endurance evaluation: A comparison between the handgrip strength and three body weight tests
2021
BACKGROUND: The hand-grip strength test has been widely adopted to evaluate upper limb strength. Other field based tests as push-ups and pull-ups are commonly used for the same purpose. It is however unclear if these may be used interchangeably for upper body strength evaluation. OBJECTIVE: The purpose of this investigation was to evaluate strength endurance of the upper body and understand which test could be the most appropriate for upper body evaluation. METHODS: Thirty-eight healthy young male participants were tested with three tests comprised of: 1) push-ups (PS), 2) pull-ups (PL) and 3) parallel dips (PD) performed to exhaustion. Grip strength (GS), total number of repetitions, time-…
The multiple slope discontinuity beam element for nonlinear analysis of RC framed structures
2018
The seismic nonlinear response of reinforced concrete structures permits to identify critical zones of an existing structure and to better plan its rehabilitation process. It is obtained by performing finite element analysis using numerical models classifiable into two categories: lumped plasticity models and distributed plasticity models. The present work is devoted to the implementation, in a finite element environment, of an elastoplastic Euler–Bernoulli beam element showing possible slope discontinuities at any position along the beam span, in the framework of a modified lumped plasticity. The differential equation of an Euler–Bernoulli beam element under static loads in presence of mul…
On the Size Complexity of Deterministic Frequency Automata
2013
Austinat, Diekert, Hertrampf, and Petersen [2] proved that every language L that is (m,n)-recognizable by a deterministic frequency automaton such that m > n/2 can be recognized by a deterministic finite automaton as well. First, the size of deterministic frequency automata and of deterministic finite automata recognizing the same language is compared. Then approximations of a language are considered, where a language L′ is called an approximation of a language L if L′ differs from L in only a finite number of strings. We prove that if a deterministic frequency automaton has k states and (m,n)-recognizes a language L, where m > n/2, then there is a language L′ approximating L such that L′ c…
THE RED PALM WEEVIL IN SICILY: THE INTRODUCTION AND SPREAD OF AN INVASIVE ALIEN SPECIES
2013
The red palm weevil (RPW), Rhynchophorus ferrugineus Olivier (Coleoptera: Curculionidae), is a pest from Southeast Asia accidentally introduced into North Africa and Europe two decades ago. In Sicily, RPW was recorded for the first time in 2005, then, in few years, it established becoming the most severe pest of ornamental palm species in urban, monumental and country areas. In this paper, we first report the history of its introduction and spread. Then, we reviewed the preventative and curative strategies that have been implemented with variable degrees of success in containing the invasive alien pest. Finally, we focus on the development of new strategies to detect early infestations and …
TELAI DISSIPATIVI IN ACCIAIO PER LA MITIGAZIONE DEL RISCHIO SISMICO DI SISTEMI MURARI DI INTERESSE STORICO
2011
Il lavoro riguarda la possibilità di impiego di dispositivi fluido viscosi per il miglioramento o l’adeguamento sismico di edifici in muratura appartenenti all’edilizia storico monumentale. In questi casi, per evidenti motivi legati alla tutela dei valori architettonici dell’opera, non è possibile adottare interventi di tipo tradizionale per il rinforzo statico della muratura (FRP, CAM). Una soluzione alternativa, di maggiore efficacia, può essere ottenuta attraverso l’inserimento di dispositivi fluido viscosi, con il risultato di aumentare la capacità dissipativa della struttura con conseguente riduzione della domanda di spostamento. A riguardo, si descrive una procedura, già proposta da a…