Search results for "Conventional"
showing 10 items of 361 documents
Comparative in vitro study of the accuracy of impression techniques for dental implants: Direct technique with an elastomeric impression material ver…
2019
Background The aim of this study was to compare a conventional technique (elastomeric impression material - EIM) and a digital technique (scanner digital model – SDM) on a six-analog master model (MM) to determine which was the most exact. Material and Methods Twenty impressions were taken of a master model (EIM) and twenty scanned impressions (SDM) (True Definition). A coordinate measuring machine (CMM) was used to measure the distances between adjacent analogues (1-2, 2-3, 3-4, 4-5, 5-6), intermittently positioned analogues (1-4, 3-6) and the most distal (1-6). Reference values were established from the master model, which were compared with the two impression techniques. The significance…
Estudio de la eficacia escolar en centros educativos de primaria mediante el uso de Modelos Jerárquicos Lineales
2021
espanolINTRODUCCION. Se presenta un estudio censal sobre la eficacia escolar en los centros educativos de primaria de la comunidad autonoma de La Rioja, un analisis secundario de una evaluacion diagnostica (ED) previa en esa comunidad. Se valoro el impacto de variables contextuales en los rendimientos de las asignaturas evaluadas no usando las puntuaciones medias brutas obtenidas en la ED, sino las puntuaciones medias ajustadas una vez controlado el efecto de variables contextuales. METODO. El control se realizo por modelizacion estadistica multinivel con modelos jerarquicos lineales en dos niveles: estudiantes y centros. Los residuos de los modelos se usaron como criterio de eficacia escol…
The Effect of Nonlinear Response of the Primary System in Nonconventional TMDs
2023
Tuned Mass Dampers (TMD) have been widely used in the passive vibration control of engineering structures, both under wind and seismic loads. Under wind loads, a proper frequency tuning ensures a significant response reduction of the primary structure. While under wind loads the structure is likely to remain in the elastic range of behaviour, when large earthquakes occur it can experience inelastic deformations and damage, with a consequent de-tuning effect. In this paper, nonconventional TMDs with large mass ratios, realized through Interstory Isolation Systems (IIS), are considered and the influence of the inelastic behaviour of the primary system on the overall structure response is anal…
Effectiveness of isolated vertical extension of masonry buildings as nonconventional TMD
2023
In this paper, the strategy of Intermediate Isolation System (IIS) is proposed for the vertical extension of an aggregate of masonry buildings located in Pozzuoli, south Italy. The effectiveness of IIS working as a nonconventional Tuned Mass Damper (TMD) for the existing construction is assessed in terms of reduction of seismic demand and damage in the masonry structure undergoing inelastic deformation under seismic input. For this aim, a general step-by-step procedure is first defined and then applied to the case study building. In particular, the characterization of dynamic behaviour and seismic capacity of the building aggregate is first addressed through modal and push over analyses. El…
Estimation of Air Pollutant Emissions in “Turbo” and in Conventional Roundabouts
2013
The road pollutant emissions, above all in urban context, are correlated to many infrastructural parameters and to traffic intensity and typology. The research work on road junction geometry, carried out in European research centres, has recently allowed to design new road intersection types which are of undoubted interest, especially in terms of traffic functionality and safety, like the turbo roundabouts (in which right-turn manoeuvres do not conflict with the circulating flow). The main objective of this paper is to propose a model for the estimation the performances and the pollutant emissions into turbo roundabouts. A comparative analysis between conventional roundabout and turbo round…
Trajectory tracking for a Non-Conventional UAV
2008
The aim of the present paper is the design of a flight control system for a Tandem – Canard UAV, useful in the whole flight envelope, both Out of Ground Effect (OGE) and In Ground Effect (IGE) conditions. Because of the particular arrangement of the studied aircraft, a general mathematical model has been built in order to obtain non-linear analytical equations for longitudinal aerodynamic coefficients both in OGE and in IGE flight. So the dynamic behaviour of the UAV may be studied during every flight phases i.e. in the whole range of altitude. To consider the strong variation of aerodynamic parameters due to the ground effect presence, a robust control technique (LQG/LTR) has been used to …
Rule of Recognition, Convention and Obligation. What Shapiro Can Still Learn From Hart’s Mistakes
2012
Shapiro works out a version of legal positivism, taking as its starting point Hart’s practice theory of law. Some serious limits of Hart’s practice theory of norms concern the conception of legal obligation and normativity of law. In this chapter, I analyze the limits of Hart’s conception of legal normativity and I appraise whether the planning theory of law indicates the correct direction for overcoming them. To anticipate the conclusion, my effort is to show that Shapiro replicates Hart’s mistakes on these subject matters. This chapter is divided into three main sections. First, I will present briefly a critical reconstruction of Hart’s conception of normativity, a reconstruction which is…
Rules, Conventionalism and Normativity: Some Remarks Starting from Hart
2014
The paper deals with the “conventionalist turn” in legal positivism in relation to the matter of the duty to obey the law and legal normativity. In this respect, conventionalist legal positivism is worth considering (a) because it offers an explanation of legal normativity partly different vis-a-vis previous ones and (b) because it tries to preserve the autonomy of legal obligation from moral obligation and coercion, respectively. Here I will only focus on legal conventionalism as sketched out by Hart in the Postscript. Indeed, Hart’s conventionalism comes up against problems which to some extent also affect other distinguished versions of legal conventionalism like, for example, those work…
The Third Theory of Legal Objectivity
2013
The question of the objectivity of law rotates around the determination of the status of the norms that constitute the major premise of the practical syllogism representing the formal scheme of the justification of judicial decisions. Those who deny the objectivity of law believe that the existence and meaning of legal norms depend on the opinion of judges and jurists considered individually. The different versions of the objectivity of law reject this sceptical conclusion. The strongest versions of objectivity accepted by the different doctrines of natural law presuppose metaphysical realism and rule out the idea that what seems correct to someone can determine what is effectively correct;…
An immense task: Hart sull'obbligo di obbedire al diritto
2012
The topic of legal normativity absorbed Hart until the last years of his life. This paper offers a diachronic analysis of Hart’s perspective on the obligation to obey the law. The aim is to show that, at least as regards the justification of the obligation to obey the law, Hart’s former attempt to maintain the autonomy of law from morality and coercion is not convincing and that the “conventionalist turn” sketched in the Postscript leads to a dead end. Therefore, to give up the autonomy of legal obligation from moral obligation seems the only way forward, being aware that this move does not imply the abjuration of legal positivism.