The spatial association of numbers and mathematical symbols

The "SNARC effect" refers to the finding that people respond faster to small numbers with the left hand and to large numbers with the right hand. This effect is often explained by hypothesizing that numbers are represented from left to right in ascending order (Mental Number Line). However, the SNARC effect may not depend on quantitative information, but on other factors such as the order in which numbers are often represented from left to right in our culture. Four experiments were performed to test this hypothesis. In the first experiment, the concept of spatial association was extended to nonnumeric mathematical symbols: the minus and plus symbols. These symbols were presented as fixation points in a spatial compatibility paradigm. The results demonstrated an opposite influence of the two symbols on the target stimulus: the minus symbol tends to favor the target presented on the left, while the plus symbol the target presented on the right, demonstrating that spatial association can emerge in the absence of a numerical context. In the last three experiments, the relationship between quantity and order was evaluated using normal numbers and mirror numbers. Although mirror numbers denote quantity, they are not encountered in a left-to-right spatial organization. In Experiments 1 and 2, participants performed a magnitude classification task with mirror and normal numbers presented together (Experiment 1) or separately (Experiment 2). In Experiment 3, participants performed a new task in which quantity information processing was not required: the mirror judgment task. The results show that participants access the quantity of both normal and mirror numbers, but only the normal numbers are spatially organized from left to right. In addition, the physical similarity between the numbers, used as a predictor variable in the last three experiments, showed that the physical characteristics of numbers influenced participants' reaction times.

Synergies among safety and security in the prevention of major accidents related to dangerous substances

Historical evidence shows that chemical, process, and Oil&Gas facilities where dangerous substances are stored or handled are target of deliberate malicious attacks (security attacks) aiming at interfering with normal operations. Physical attacks and cyber-attacks may generate events with consequences on people, property, and the surrounding environment that are comparable to those of major accidents caused by safety-related causes. The security aspects of these facilities are commonly addressed using Security Vulnerability/Risk Assessment (SVA/SRA) methodologies. Most of these methodologies are semi-quantitative and non-systematic approaches that strongly rely on expert judgment, leading to security assessments that are not reproducible. Moreover, they do not consider the synergies with the safety domain. The present 3-year research is aimed at filling the gap outlined by providing knowledge on security attacks, as well as rigorous and systematic methods supporting existing SVA/SRA studies suitable for the chemical, process, and Oil&Gas industry. The different nature of cyber and physical attacks resulted in the development of different methods for the two domains. The first part of the research was devoted to the development and statistical analysis of security databases that allowed to develop new knowledge and lessons learnt on security threats. Based on the obtained background, a Bow-Tie based procedure and two reverse-HazOp based methodologies were developed as hazard identification approaches for physical and cyber threats respectively. To support the quantitative estimation of the security risk, a quantitative procedure based on the Bayesian Network was developed allowing to calculate the probability of success of physical security attacks. All the developed methods have been applied to case studies addressing chemical, process and Oil&Gas facilities (offshore and onshore) proving the quality of the results that can be achieved in improving site security. Furthermore, the outcomes achieved allow to step forward in developing synergies and promoting integration among safety and security management.

Il giudizio di buona fede sull'attività della pubblica amministrazione

L’applicazione del principio di buona fede oggettiva all’attività della pubblica amministrazione, sia contrattuale che provvedimentale, è attualmente fuori discussione, tuttavia i limiti e le modalità attraverso cui questo principio si articola sono ancora oggetto di dibattito dottrinale e giurisprudenziale, in particolare modo per quanto riguarda l’istituto della responsabilità precontrattuale della p.a. Tale ultimo istituto è oggetto di uno specifico approfondimento, che tenterà di analizzare i principali punti cruciali del dibattito: la tutela del legittimo affidamento del privato durante le trattative instaurate con la p.a., la natura giuridica della responsabilità precontrattuale e questioni di stampo più processuale, come il riparto di giurisdizione tra giudice ordinario e amministrativo. Al fine poi di comprendere pienamente le funzioni svolte dal principio di buona fede nell’ambito delle attività pubbliche, sia contrattuali che autoritative, la ricerca si è concentrata anche sulle diverse interpretazioni che gli studiosi del diritto hanno attribuito oggi al giudizio di buona fede, inteso sia come principio civile contrattuale che come nuovo principio amministrativo costituzionalmente orientato. Nel proseguo della dissertazione, infatti, si cerca di valutare l’applicabilità del giudizio di buona fede da un punto di vista interdisciplinare, civile e amministrativo, allo scopo di dimostrare come tale principio sia riuscito lentamente a pervadere anche la materia amministrativa, condizionando in senso garantista non solo il dictum giurisprudenziale, ma anche l’intervento normativo del legislatore.