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Influence of quarantine during the coronavirus disease 2019(COVID-19)pandemic on physical and psychosocial aspects:perceptions of 214 Brazilian athletes

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Global Health Journal 2023年第1期7卷 49-54页

作者： Eliane de Morais Machado Leonardo Luiz Barretti Secchi Paula Rezende Camargo luciana de michelis mendonca Physical Therapy department Universidade Federcd de Sao Carlos(UFSCar)Sao CarlosSP CEP 13565-905Brazil Physical Therapy department Universidade Federal de Minas Gerais(UFMG)Belo Horizonte MG CEP 31270-901Brazil

Background:Social distancing may affect athletes,training,causing negative effects on mental and physical ***:This study therefore aimed to characterize the perception of Brazilian athletes about their physical and psychosocial aspects,sleep quality and coping strategies during the quarantine of the coronavirus disease 2019(COVID-19)***:This was a cross-sectional study with online survey,performed with Brazilian athletes(amateur and professional)over 18 *** main outcomes measures assessed were physical and psychosocial aspects,sleep quality and coping ***:A total of 214 athletes were *** average weekly hours of training during the quarantine was 4.71±3.71 h,of which 64.5%athletes(138/214)were oriented by medical staff during *** 52.8%(113/214)of athletes,training intensity during the quarantine was different/very different from the intensity before the quarantine.79.4%athletes(170/214)reported moderate to extreme difficulties in keeping the same level of training during the quarantine.77.1%athletes(165/214)had moderate to extreme anxiety and each of the athletes had concern about his or her athletic career future,including return to the sport.72.9%athletes(156/214)reported change in sleep schedule during the quarantine ***:The quarantine period during COVID-19 pandemic negatively affected the athlete^perception about training routine,since athletes reported reduction in training hours and training ***,the athletes reported that they were moderately to extremely *** also had concerns about their career in the future,as well as concerns regarding return to sport.

关键词： Social isolation Performance Psychological aspects Sleep quality Sport

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Roasting and chlorine leaching of gold-bearing refractory concentrate:Experimental and process analysis

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International Journal of Mining Science and Technology 2013年第5期23卷 709-715页

作者： Ida de michelis Agostino Olivieri Stefano Ubaldini Francesco Ferella Francesca Beolchini Francesco Vegliò department of Chemistry Chemical Engineering and MaterialsUniversity of L’Aquila Institute of Environmental Geology and Geoengineering CNR Via Bolognola department of Marine Sciences Polytechnical University of MarcheVia Brecce Bianche

This paper deals with gold extraction from a refractory concentrate by chlorine *** process considers a pre-treatment of refractory materials by low temperature oxidation carried out with low oxygen *** oxidized material is treated by leaching with *** gold adsorption/reduction onto activated carbon,iron and base metals can be precipitated by *** tests show the necessity to carry out a thermal pre-treatment at least at 550°C to obtain a reduction of sulfur and mercury in the material(50%and 90%,respectively).Highest gold extraction yield(around 93%)is obtained in the leaching test performed with material sample treated at 650°*** result confrms the necessity to optimize the thermal pre-treatment to improve Au recovery and to reduce chlorine consumption.A comparison with conventional cyanidation confrms that chlorination could be an useful alternative:in fact,gold extraction yield is quite low:57%in non-pre-treated material and 25%in pre-treatment material.

关键词： Gold ores Refractory ores Leaching Chlorine

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Extraction of metals from automotive shredder residue: Preliminary results of different leaching systems

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Chinese Journal of Chemical Engineering 2015年第2期23卷 417-424页

作者： Francesco Ferella Ida de michelis Agostino Scocchera Mario Pelino Francesco Vegliò DIIIE-Dipartimento di Ingegneria Industriale dell' Informazione ed Economia Università degli Studi di L'Aquila

The study is focused on the extraction of valuable metals from automotive shredder residue(ASR)by different leaching ***,ASR samples were roasted at 600°C to simulate a thermal treatment *** water,citric and sulphuric acid were preliminarily investigated,thus two further full factorial systems entailing H2SO4–H2O2and H2SO4–H2O2–Fe3+were *** preliminary experimental results showed that0.1 mol·L-1H2SO4solution extracted 100%of Cu,Fe and Zn,whereas citric acid leached 100%of Zn and Pb,59%of Fe and 62%of Cu;whereas,H2SO4–H2O2and H2SO4–H2O2–Fe3+(Fenton's)leaching media showed that Cu,Fe and Zn can be extracted simultaneously and completely from the ASR ashes before final disposal.

关键词： ASR Vehicles Automotive Metals Leaching ANOVA

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低温间歇冷冻箱的模拟

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低温与特气 1990年第3期8卷 67-71页

作者： R.O.Reynoso A.de michelis 曹振连

给出了用简化数学模型评价间歇式冷冻箱的性能,与试验数据比较,结果令人满意。用该模型分析了各种操作因素对冷冻过程的影响。使用厂家认为这项模拟方法能够估算出产品冷冻速度,并计算冷冻箱中冷冻时间同消耗费用之间的关系。

关键词：冷冻箱低温间歇式模拟

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