196,634 research outputs found
A novel algorithm for detecting the drowsiness onset in real-time
No full textTrafc accidents due to drivers falling asleep while driving is an important cause of death,
and effective techniques for coping with this phenomenon are needed. In this paper we present a simple,
yet effective algorithm, based on heart rate variability analysis. Results of the experimental validation are
reported: two test sessions were performed, one in domestic environments and one in realistic driving
environments by using a dynamic driving simulator. The results conrm the results obtained in the previous
work (Groppo et al., 2020), and the capability of the proposed algorithm in predicting sleep while driving
using a physiological signal that can be collected at the wrist of the driver
I depositi quaternari di Borzano, Rio Groppo e Toscanella. Paleosuoli, sedimenti, Industrie
No full textVengono presentati i depositi quaternari di Borzano, Rio Groppo e Toscanella, presso il limite meridionale della Valle del Po, in Emilia-Romagna. Sono oggetto di analisi le caratteristiche geostratigrafiche, pedologiche, sedimentologiche e delle industrie litiche rinvenut
Zanthoxylum asiaticum (L.) Appelhans, Groppo & J. Wen
No full textZanthoxylum asiaticum (L.) Appelhans, Groppo & J.Wen — Habit: Liana or shrub. Habitat: LMWF, LMDF; up to 2 800 m. Distribution: I. Voucher: Burguret Track, Alt. 2 392 m, 7 Feb. 2015, SAJIT 003103 (HIB). References: Fries (1923b), Bussmann (1993), Bussmann & Beck (1995a, 1998).Published as part of Zhou, Ya-Dong, Mwachala, Geoffrey, Hu, Guang-Wan & Wang, Qing-Feng, 2022, Annotated checklist of the vascular plants of Mount Kenya, East Africa, pp. 1-108 in Phytotaxa 546 (1) on pages 60-61, DOI: 10.11646/phytotaxa.546.1.1, http://zenodo.org/record/655046
History of the morphological characters 11 and 13 traced onto the majority-rule consensus tree from Bayesian analysis of the combined molecular data:
No full text<p>A. character 11, with photo of flower of <i>Almeidea rubra</i> (by M. Groppo), showing free petals; B. character 13, with photo of the flower of <i>Almeidea albiflora</i> (by M. Groppo), showing filaments free from the petals.</p
EMPIRICAL ESSAYS IN DEVELOPMENT ECONOMICS
No full textIn developing countries, where formal credit and insurance markets are incomplete or non-existent, households use informal mechanisms to increase their consumption, savings and insurance possibilities. This dissertation studies two of these informal devices: participation in Rotating Savings and Credit Associations (roscas), and internal migration. I mainly follow an empirical approach, using the Indonesia Family Life Survey dataset (IFLS).
In particular, I analyze the effect of mothers’ participation in roscas on children secondary or tertiary school enrollment: taking into account the endogeneity of maternal participation in roscas, I find that maternal participation significantly increases the probability of children’s school enrollment. The results show a negative correlation between the unobservables determining rosca participation and the unobservables determining schooling. This can be interpreted as evidence that in households that are more vulnerable to shocks, mothers invest less in their children’s education, while increasing their participation in roscas, as an insurance and savings device.
The subsequent chapter analyzes the determinants of internal migration in Indonesia, distinguishing between ‘individual migration’ and ‘family migration’, where the first relates to movements which individuals undertake alone, while the latter indicates movements they undertake with their families. The estimates, performed on men and women samples separately, highlight that individual and family migration have very distinct determinants. For instance, an increase in household wealth (proxied by the value of land owned) does not influence the probability of individual migration, while significantly reducing the probability of family moves. The results also show that, among men, individuals whose households have intermediate levels of income are less likely to move alone, compared to those in the extreme of the households' income distribution. This is consistent with the predictions of the New Economics of Labour Migration.
The final chapter (joint with M. Mendola, Università degli Studi di Milano Bicocca) studies the impact of internal migration on the consumption growth of origin households. We are able to disentangle the impact of current and return migration, while taking into account the endogeneity of internal migration. We find that having current internal migrants does not exert a statistically significant impact on origin households’ consumption growth, while having return internal migrants significantly reduces per capita consumption growth at origin. The IFLS data suggest that the negative effect of return migration on consumption growth is likely to be explained by a lower income potential of returning migrants with respect to current migrants and non-migrants
Hybrid synchronous motor-alternator with dual AC/DC excitation system for shipboard generation and propulsion applications
No full textState-of-the-art ships focus on enhancing vessel performance, lower emissions, optimize space on board and save fuel. This paper describes an innovative marine solution in which the same electric machine can be operated as a conventional shaft generator and also as a variable speed propulsion motors. The distinctive design (patent pending) consists of a special synchronous machine provided with two separate exciters (one AC and the second DC) each capable to energize the same main rotor field through two independent rotating rectifiers. Whilst the conventional PTO/PTI systems may use the synchronous machine in a very narrow speed range - the presence of the independent AC exciter allows to energize the main field from zero rpm. The propeller can therefore be fully electrically operated. The dual-excitation arrangement is described in the paper highlighting its benefits compared to the conventional design. Numerical simulations are presented to assess the possible electromagnetic interactions between the two coaxial rotating excitation systems. Extensive testing campaign validated the design expectations
M. Kalbus on An American in Hitler’s Berlin (C. Collomp and B. Groppo, eds)
No full textCollomp, Catherine and Bruno Groppo. Eds and Introduction. An American in Hitler’s Berlin: Abraham Plotkin’s Diary, 1932-33. Urbana and Chicago: University of Illinois Press, at Urbana and Chicago, 2009. xiii-xlix + pp 272. ‘Why is there no socialism in the United States?’ is a question that has interested quite a few European observers of the American scene – most notably the German sociologist Werner Sombart. ‘Why is there socialism in Germany?’ and ‘what does it look like?’ are questions ..
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