Stability of switching linear systems with switching signals driven by stochastic processes     

Alessandro N. Vargas  Constantin F. Caruntu  João Y. Ishihara 《Journal of The Franklin Institute》2019,356(1):31-41

This paper presents conditions to assure the exponential stability in probability for autonomous switching linear systems. The switching signal acting on the autonomous system produces intervals that follow independent, identically distributed stochastic processes—the stability then follows by verifying simple-to-check linear matrix inequalities.  相似文献   

Twiplomacy in the age of Donald Trump: Is the diplomatic code changing?     

Maja Šimunjak  Alessandro Caliandro 《The Information Society》2019,35(1):13-25

This study employs digital methods in conjunction with traditional content and discourse analyses to explore how the US President Donald Trump conducts diplomacy on Twitter and how, if at all, diplomatic entities around the world engage in diplomatic exchanges with him. The results confirm speculations that Trump’s diplomatic communication on Twitter disrupts traditional codes of diplomatic language but show little evidence that new codes of diplomatic interactions on social media are being constructed, given that other diplomatic entities around the world mostly remain within the confines of traditional notions of diplomacy in (not) communicating with Trump on Twitter.  相似文献   

The fortunes of modern oceanography     

Antonello  Alessandro 《Metascience》2021,30(3):451-454

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Giordano Bruno’s Renaissance philosophy     

Pietro Daniel Omodeo 《Metascience》2014,23(2):353-356

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Tales from three countries: reflections during COVID-19 for mathematical education in the future     

Krause  Christina M.  Di Martino  Pietro  Moschkovich  Judit N. 《Educational Studies in Mathematics》2021,108(1-2):87-104

How can school mathematics prepare citizens for a democratic society? Answers to this question are not static; they change as society and its problems change. The SARS-CoV-2 pandemic with its corresponding disease COVID-19 presents such a problem: what is needed to navigate this complex situation that involves, among other things, mathematics? Using the essay genre, we use three narratives from three countries—Italy, the USA (California), and Germany—to reflect on the goals of teaching mathematics during this crisis and examine aspects of each country’s standards for mathematics education. These three stories are framed by the authors’ backgrounds, experiences, interests, their country’s situation, and response to the pandemic. We first present the three narratives and then examine common issues across them that might provide insights beyond this current crisis, for preparing students to become active citizens. In particular, we focus on three issues: (1) developing a positive mindset toward mathematics to engage with and reflect on real-world problems, (2) improving interdisciplinary connections to the sciences to better understand how science professional practices and insights are similar or different from everyday practices, and (3) considering interpersonal and collective matters beyond the individual.

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The Development and Psychometric Properties of the Teacher Social Stress Scale-Student Related (TSS-Sr)     

Stefano Taddei  Bastianina Contena  Alessandro Pepe  Eva Venturini 《Scandinavian Journal of Educational Research》2019,63(2):272-284

Teacher burnout is a growing phenomenon that may dramatically reduce the quality of life of both teachers and students. Many studies have conceptualized teaching as a high-contact profession and, focusing on the emotional exhaustion dimension of burnout, they have highlighted the relation with students as a key dimension of teachers’ stress. This paper presents an original instrument (TSS-Sr) to measure teachers’ stress related to the interaction with their pupils. It provides the psychometric characteristic of this scale. Results support a model of measurement of teacher social stress based on four dimensions: verbal aggression, dislike students, awkward reactions, demanding requests. Implications about the use and the applications of this instrument are discussed.  相似文献   

Reduction of water evaporation in polymerase chain reaction microfluidic devices based on oscillating-flow   总被引：1，自引：0，他引：1  

Alessandro Polini  Elisa Mele  Anna Giovanna Sciancalepore  Salvatore Girardo  Adriana Biasco  Andrea Camposeo  Roberto Cingolani  David A. Weitz    Dario Pisignano 《Biomicrofluidics》2010,4(3)

Producing polymeric or hybrid microfluidic devices operating at high temperatures with reduced or no water evaporation is a challenge for many on-chip applications including polymerase chain reaction (PCR). We study sample evaporation in polymeric and hybrid devices, realized by glass microchannels for avoiding water diffusion toward the elastomer used for chip fabrication. The method dramatically reduces water evaporation in PCR devices that are found to exhibit optimal stability and effective operation under oscillating-flow. This approach maintains the flexibility, ease of fabrication, and low cost of disposable chips, and can be extended to other high-temperature microfluidic biochemical reactors.  相似文献   

Effect of contact and no-contact small-sided games on elite handball players     

Antonio Dello Iacono  Domenico Martone  Alessandro Moura Zagatto  Yoav Meckel  Mahmood Sindiani  Mirjana Milic 《Journal of sports sciences》2018,36(1):14-22

This study aimed to investigate the effect of contact (C-SSG) and no-contact (NC-SSG) handball small-sided games (SSGs) on motion patterns and physiological responses of elite handball players. Twelve male handball players performed 10 C-SSG and 10 NC-SSG while being monitored through the heart rate (HR) and rate of perceived exertion (RPE) as physiological responses and time-motion activities profile using video-match analysis. Both game conditions resulted in similar HR responses (P > 0.05), but the NC-SSG led to a higher RPE scores. The time-motion activity analysis featured NC-SSG with a greater amount of walking (855.6 ± 25.1 vs. 690.6 ± 35.2 m) and backward movements (187.5 ± 12.3 vs. 142.5 ± 8.7 m) combined with fast running (232.3 ± 8.5 vs. 159.7 ± 5.7 m) and sprinting (79.5 ± 4.7 vs. 39.7 ± 3.7 m) activities (P < 0.001). Conversely, C-SSG had a higher percentage of jogging and sideway movements associated with greater frequency of jumping (0.87 ± 0.09 vs. 0.31 ± 0.06 nr) and physical contact (1.82 ± 0.55 vs. 0.25 ± 0.03 nr) events (P < 0.001). No between-regimen differences were found for the number of throws (P = 0.745). In addition, the RPE was significantly correlated with fast running relative distances (r = 0.909, P < 0.001) and sprinting relative distances (r = 0.939, P < 0.001). In conclusion, this investigation showed that both C-SSG and NC-SSG in team handball can effectively represent specifically oriented exercises, according to the sport-task and the performance demands.  相似文献   

Comparing fictional,personal, and hypothetical narratives in primary school: story grammar and mental state language     

Emiddia Longobardi  Pietro Spataro  Marialuisa Renna  Clelia Rossi-Arnaud 《European Journal of Psychology of Education - EJPE》2014,29(2):257-275

The present study examined the use of narrative categories and mental state words in the fictional, personal, and hypothetical stories written by 150 children in the third, fourth, and fifth grades of primary school. There were three main results. First, children were better able to write fictional and hypothetical than personal stories, when considering the total number of narrative categories and the percentages of stories including at least one complete episode. Second, there was clear evidence of differentiation between the three tasks, both in terms of narrative categories and mental state language. Third, the use of mental state words correlated with the frequency of subordinate propositions and the number of narrative categories included in the stories. These findings support the hypothesis of a bidirectional interaction between lexical and syntactic development and suggest that narrative writing involves metalinguistic abilities directly related to the spontaneous use of psychological lexicon. Educational implications are discussed.  相似文献   

3-min all-out effort on cycle ergometer is valid to estimate the anaerobic capacity by measurement of blood lactate and excess post-exercise oxygen consumption     

Alessandro Moura Zagatto  Paulo Eduardo Redkva  Rodrigo Araújo Bonetti de Poli  Joel Abraham Martinez González  Jeniffer Zanetti Brandani  Thiago Penedo 《European Journal of Sport Science》2019,19(5):645-652

The purpose of this study was to investigate the use of a single 3-min all-out maximal effort to estimate anaerobic capacity (AC) through the lactate and excess post-exercise oxygen consumption (EPOC) response methods (AC_{[La^?]+EPOCfast}) on a cycle ergometer. Eleven physically active men (age?=?28.1?±?4.0?yrs, height?=?175.1?±?4.2?cm, body mass?=?74.8?±?11.9?kg and ?O_2max?=?40.7?±?7.3?mL?kg^?1?min^?1), participated in the study and performed: i) five submaximal efforts, ii) a supramaximal effort at 115% of intensity of ?O_2max, and iii) a 3-min all-out maximal effort. Anaerobic capacity was estimated using the supramaximal effort through conventional maximal accumulated oxygen deficit (MAOD) and also through the sum of oxygen equivalents from the glycolytic (fast component of excess post-exercise oxygen consumption) and phosphagen pathways (blood lactate accumulation) (AC_{[La^?]+EPOCfast}), while during the 3-min all-out maximal effort the anaerobic capacity was estimated using the AC_{[La^?]+EPOCfast} procedure. There were no significant differences between the three methods (p?>?0.05). Additionally, the anaerobic capacity estimated during the 3-min all-out effort was significantly correlated with the MAOD (r?=?0.74; p?=?0.009) and AC_{[La^?]+EPOCfast} methods (r?=?0.65; p?=?0.029). Therefore, it is possible to conclude that the 3-min all-out effort is valid to estimate anaerobic capacity in physically active men during a single cycle ergometer effort.  相似文献