221 research outputs found

    Spin nematic order in antiferromagnetic spinor condensates

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    Large spin systems can exhibit unconventional types of magnetic ordering different from the ferromagnetic or N\'eel-like antiferromagnetic order commonly found in spin 1/2 systems. Spin-nematic phases, for instance, do not break time-reversal invariance and their magnetic order parameter is characterized by a second rank tensor with the symmetry of an ellipsoid. Here we show direct experimental evidence for spin-nematic ordering in a spin-1 Bose-Einstein condensate of sodium atoms with antiferromagnetic interactions. In a mean field description this order is enforced by locking the relative phase between spin components. We reveal this mechanism by studying the spin noise after a spin rotation, which is shown to contain information hidden when looking only at averages. The method should be applicable to high spin systems in order to reveal complex magnetic phases.Comment: published versio

    Effect of live yeast (Saccharomyces cerevisiae) administration on apparent digestibility of horses

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    Six mares were divided into two groups of three subjects each in a crossover design on the basis of body weight and age: Control(C)fedabasaldiet,Treatment(T)fedabasaldietand2 Control (C) fed a basal diet, Treatment (T) fed a basal diet and 2 2 g/head/d of live yeast ((S. cerevisiae 4.6x1010 CFU/day).Theexperimentaldesignwasdividedintotwo ).Theexperimentaldesignwasdividedintotwo . The experimental design was divided into two periods named period 1 and period 2 respectively of 35d each, and consisting of 3 different phases. Dur- ing each period all animals were subject to an adaptation phase of 14d (phase1); during phase 2 (18d) and phase 3 live yeast was administered (T) or not (C). Phase 3 consisted in a three days individual fecal collection period all the groups, in order to determine dry matter, organic matter, crude protein, crude fat, NDF and ADF apparent digestion rates using acid insoluble ash (AIA) as internal marker (Bergero et al., 2005). Results obtained evidenced as the administration of S. cerevisiae to mature horses resulted in increased digestibility of dry matter, organic matter, NDF, and ADF

    Pr√°cticas transformistas en el documental latinoamericano reciente: usos de la voz y flujos musicales

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    El presente trabajo pretende ser unaporte al trazado de una cartograf√≠atorcida, a la construcci√≥n de un mapade la geograf√≠a audiovisual sexodisidenteen el cine documental deLatinoam√©rica, luego de d√©cadas deuna artiller√≠a audiovisual altamentetransf√≥bica. En el cortometrajedocumental La Otra (1989), deLucrecia Martel, se puede visibilizarun momento central del trayectohacia una visibilidad trans ennuestra cinematograf√≠a. En esetrabajo estudiantil de la directoraobservamos algo inusual para el cinedocumental local y para los estudiosteatrales latinoamericanos: el foco enlas pr√°cticas transformistas.Nuestro primer esbozo de estemapa se extiende temporalmentedesde 1989 hasta 2017 y estableceun recorrido por Argentina, M√©xico,Venezuela, Cuba y Per√ļ. Este corpusinicial lo conforman, adem√°s deltrabajo de Martel, los siguientescortometrajes: Es mi vida (el arte dela transformaci√≥n) (Espinoza, 1995);Perra (Navarro, Plaza y Gonz√°lez,2011); El Arte de La Transformaci√≥n(Uzcategu√≠ y Castillo, 2016) y Nebulah(Montoro, 2017).Reivindicando un posicionamientoespec√≠fico dentro del campo delcine documental, y construyendoun archivo desviado del canon,proponemos aqu√≠ una mirada quereflexione sobre los usos de la voz ylos flujos musicales en las pr√°cticasdrag presentadas en los films, lascuales desde hace d√©cadas batallancontra la transfobia a√ļn vigente enlas sociedades occidentales e inclusovisible en el discurso esgrimido porsus propixs art√≠fices.O presente trabalho tem como objetivo contribuir para o tra√ßado de uma cartografia torcida, para a constru√ß√£o de um mapa da geografia audiovisual dissidente de sexo no cinema documental da Am√©rica Latina, ap√≥s d√©cadas de uma artilharia audiovisual altamente transf√≥bica. No curta-metragem document√°rio La Otra (1989), de Lucrecia Martel, um momento central da jornada pode ser tornado vis√≠vel para a visibilidade trans em nossa cinematografia. Nesse trabalho estudantil da diretora, observamos algo incomum no cinema documental local e nos estudos de teatro latinoamericanos: o foco em pr√°ticas drag. Nosso primeiro esbo√ßo deste mapa se estende temporariamente de 1989 a 2017 e estabelece um tour pela Argentina, M√©xico, Venezuela, Cuba e Peru. Esse corpus inicial √© composto, al√©m do trabalho de Martel, pelos seguintes curtas-metragens: Es mi vida (el arte de la transformaci√≥n) (Espinoza, 1995); Perra (Navarro, Plaza y Gonz√°lez, 2011); El Arte de La Transformaci√≥n (Uzcategu√≠ y Castillo, 2016) e Nebulah (Montoro, 2017). Reivindicando um posicionamento espec√≠fico no campo do cinema documental e construindo um arquivo desviado do c√Ęnone, propomos aqui um olhar que reflete sobre os usos dos fluxos de voz e musical nas pr√°ticas drag apresentadas nos filmes, que v√™m lutando h√° d√©cadas contra a transfobia ainda em vigor nas sociedades ocidentais e at√© vis√≠vel no discurso exercido por seus pr√≥prixs arquitetxs.to the layout of a crooked cartography, to the construction of a map of the sexual dissident audiovisual geography in Latin America‚Äôs documentary filmmaking, after many decades of highly transphobic audiovisual imagery. In the documentary short film La otra (Lucrecia Martel 1989), we find a fundamental moment of the journey towards trans* visibility in Argentinian cinematography. In Martel‚Äôs student work, we observe something unusual for local documentary film and for Latin-American theater studies: the focus on drag performances. Our first outline of this map extends from 1989 to 2017 and establishes a trail from Argentina, Mexico, Venezuela, Cuba, and Peru. This initial corpus consists of, in addition to Martel‚Äôs work, by the following short films: Es mi vida (el arte de la transformaci√≥n) (Espinoza, 1995); Perra (Navarro, Plaza and Gonz√°lez, 2011); El Arte de La Transformaci√≥n (Uzcategu√≠ and Castillo, 2016), and Nebulah (Montoro, 2017). By claiming a specific positioning within the field of documentary cinema and building an archive that deviates from the canon, we put forward a perspective that reflects on the uses of the voice and musical flows in the drag performances presented in the films, performances that for decades have battled against transphobia, which is still active in Western societies and also present in some of the films‚Äô protagonists‚Äô own discourse.Fil: Invernizzi, Agostina Andrea. Universidad de Buenos Aires. Facultad de Filosof√≠a y Letras; Argentina. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas; ArgentinaFil: Lozano, Ezequiel. Universidad de Buenos Aires. Facultad de Filosof√≠a y Letras; Argentina. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas; Argentin

    Female to What the Fuck (FTWTF)

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    Crítica del film Female to what the fuck (Katharina Lampert y Cordula Thym, 2015).Fil: Invernizzi, Agostina Andrea. Universidad de Buenos Aires. Facultad de Filosofía y Letras. Instituto de Literatura Hispanoamericana; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Piedras, Pablo. Universidad de Buenos Aires. Facultad de Filosofía y Letras. Instituto de Literatura Hispanoamericana; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

    Il Syllabus nelle discipline motorie e sportive. Obiettivi formativi e risultati di apprendimento. Problemi e prospettive The Syllabus in motor and sports disciplines. Educational objectives and learning outcomes. Problems and perspectives

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    L’Educazione fisica, le attività motorie e lo sport, nelle Università italiane, sono ambiti disciplinari presenti nei corsi triennali di laurea in Scienze delle attività motorie e sportive e nei corsi biennali di laurea magistrali, successivi al percorso formativo degli ex Istituti Superiori di Educazione Fisica (I.S.E.F.). I piani di studio dei corsi di laurea prevedono una struttura multi-inter-disciplinare in cui sono presenti, in particolare, due settori scientifico-didattici, definiti di base e caratterizzanti, denominati metodi e didattiche delle attività motorie e metodi e didattiche delle attività sportive. Nell’ambito di ciascun settore sono compresi diversi insegnamenti ciascuno con una propria struttura disciplinare, valenze formative e vincoli epistemologici, peculiari metodologie di ricerca, caratterizzanti il profilo professionale dello studente. Gli obiettivi del seguente contributo riguardano una duplice prospettiva: analizzare la struttura dei settori disciplinari Metodi e Didattiche delle attività motorie e Metodi e Didattiche delle attività sportive e dei relativi contenuti essenziali e caratterizzanti; orientare la definizione del Syllabus necessario a definire chiaramente, per ciascun insegnamento, obiettivi e competenze attese, contenuti e metodi didattici, durata e modalità di valutazione, con particolare riferimento al settore concorsuale denominato Didattica, Pedagogia Speciale e Ricerca educativa (11D/2), al fine di condividere con gli studenti e gli stakeholder il processo didattico ed il profilo professionale in uscita. Si presentano qui i contenuti essenziali dell’insegnamento di Teoria e Metodologia del Movimento Umano, compreso nel ssd M-EDF/01- Metodi e Didattiche delle Attività Motorie. I rapporti tra settori scientifico-disciplinari e settori concorsuali, in Italia, costituiscono un snodo essenziale ed ineludibile per superare ogni possibile antitesi scientifica e metodologica, per condividere e definire i rapporti tra i temi della didattica e della ricerca, le strategie per promuovere l’evoluzione delle conoscenze e delle competenze in uscita dello Studente. Il contributo scaturisce dal bisogno di definire e condividere il core curriculum dei suddetti settori scientifico-disciplinari in ambito didattico e pedagogico, individuando altresì relazioni interdisciplinari e metodologie della ricerca.Physical education, physical activities and sport, in Italian universities, are disciplinary areas present in the three-year degree courses in Sciences of motor and sports activities and in the two-year master’s degree courses, following the training course of the former Higher Education Institutes Physics (I.S.E.F.). The study plans of the degree courses provide a multi-inter-disciplinary structure in which there are, in particular, two scientific-didactic sectors, defined as basic and characterizing, called methods and didactic of motor activities and methods and didactic of sporting activities. Within each sector there are different courses, each with its own disciplinary structure, educational values and epistemological constraints, peculiar research methodologies, characterizing the student’s professional profile. The objectives of the following contribution concern a twofold perspective: to analyze the structure of the disciplinary sectors of motor and sports activities and of the related essential and characterizing contents; orient the definition of the Syllabus necessary to clearly define, for each course, the expected objectives and skills, contents and teaching methods, duration and evaluation methods, with particular reference to the competition sector called Didactics, Special Pedagogy and Educational Research (11D / 2), in order to share the educational process and the outgoing professional profile with students and stakeholders. Here we present the essential contents of the teaching of Theory and Methodology of Human Movement, included in the ssd M-EDF / 01- Methodsand Didactics of Motor Activities. The relationships between scientific-disciplinary sectors and competition sectors, in Italy, constitute an essential and unavoidable junction to overcome any possible scientific and methodological antithesis, and to share and define the relationships between the themes of teaching and research, the strategies to promote the evolution of the student’s outgoing knowledge and competencies. The contribution stems from the need to define and share the core curriculum of the aforementioned scientific-disciplinary sectors in the didactic and pedagogical field, also identifying interdisciplinary relationships and research methodologies

    Approximate characterization of large Photovoltaic power plants at the Point of Interconnection

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    The aim of the present article is that of proposing a calculation procedure to assess electric quantities at the Point of Interconnection (POI) of large PhotoVoltaic (PV) power plants on the basis of rated data and main design elements of the plant itself. The quantities of inters are active and reactive power available at the POI in order to extrapolate the power plant capability starting from the capabilities of PWM inverters. The procedure also allows evaluating the POI voltage variations, an important element due to the increasing requirements for renewable generation units to participate in voltage regulation. The main interest in such a methodology lays in its simplicity of application, that allows avoiding the usage of dedicated software for load flow calculations, and flexibility, that makes it suitable for the support of the bidding and pre-design phase of large photovoltaic power plants

    Design and commissioning of a thermal stability test-rig for mixtures as working fluids for ORC applications

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    A novel test-rig for studying the thermal stability of mixtures as working fluids for ORC applications was designed and commissioned at the Laboratory of Compressible-fluid dynamics for Renewable Energy Applications (CREA) of Politecnico di Milano, in collaboration with the University of Brescia. The set-up is a standard one, in which a vessel containing the fluid under scrutiny is placed in a vertical oven for ~ 100 hours at a constant temperature T = Tstress. During the test, the pressure P is monitored to detect thermal decomposition of the fluid. After the test, the vessel is placed in a controlled thermal bath, where the pressure is measured at different value of the temperature T, with T < Tstress and T < Tc (Tc critical temperature). The resulting isochoric pressure-temperature dependence is compared to that obtained before the fluid underwent thermal stress. If departure from the initial fluid behavior is observed, significant thermal decomposition occurred and a chemical analysis of the decomposition products is carried out using gas chromatography and mass spectroscopy. The novelty of the set-up is the possibility of taking samples of both liquid and vapor phases of the fluid, a capability that was introduced to study thermal decomposition of mixtures, whose composition depends on the pressure and temperature, as well as to capture the more volatile products of thermal decomposition of pure fluids and mixtures. Preliminary experimental results are reported for the pure siloxane fluid MDM (Octamethyltrisiloxane, C8H24O2Si3)

    Acute effects of a combat sport environment on self-control and pain perception inhibition: a preliminary study in a new ecological framework

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    Intense sports activities affect cognitive, perceptual, and physiological domains, possibly concurring in reducing pain perception and anxiety. Within a framework for a new socio-ecological narrative that considers opposition (such as fighting) and collaboration (cooperative learning) as carriers of self-control and pain perception inhibition, we investigated the acute effects of a judo-specific session on cognitive (inhibitory control and simple reaction time), perceptual (pain and fatigue), affective (anxiety) and physiological (hormone profile) domains. Eleven male black belt judokas (age 39.0 ¬Ī 13.9 years; training experience: 23.2 ¬Ī 14.4 years) were recruited and tested before and after judo randori and resting sessions. Inhibitory control and simple reaction time were assessed via the Flanker task and clinical reaction time test, pain and fatigue were assessed using Borg‚Äôs category-ratio scale (CR-10), and the state‚Äďtrait anxiety inventory Y-1 test assessed anxiety. Glucose, insulin, cortisol, creatinine, and irisin levels were measured. Cognitive performance, perception of fatigue and physiological variables increased after randori bouts, while pain decreased. Inhibitory control, perception of pain, perception of fatigue and glucose, cortisol, and creatinine significantly differed (p &lt; 0.05) between randori and resting sessions. A high-intensity randori may induce acute beneficial effects on cognitive, perceptual, and physiological domains. Further studies should compare the results with the outcomes from a collaborative and non-agonist environment and confirm the socio-ecologic framework

    Rectus Femoris Characteristics in Post Stroke Spasticity: Clinical Implications from Ultrasonographic Evaluation

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    In stroke survivors, rectus femoris (RF) spasticity is often implicated in gait pattern alterations such as stiff knee gait (SKG). Botulinum toxin type A (BoNT-A) is considered the gold standard for focal spasticity treatment. However‚ÄĒeven if the accuracy of injection is crucial for BoNT-A efficacy‚ÄĒinstrumented guidance for BoNT-A injection is not routinely applied in clinical settings. In order to investigate the possible implications of an inadequate BoNT-A injection on patients' clinical outcome, we evaluated the ultrasound-derived RF characteristics (muscle depth, muscle thickness, cross-sectional area and mean echo intensity) in 47 stroke survivors. In our sample, we observed wide variability of RF depth in both hemiparetic and unaffected side of included patients (0.44 and 3.54 cm and between 0.25 and 3.16 cm, respectively). Moreover, our analysis did not show significant differences between treated and non-treated RF in stroke survivors. These results suggest that considering the inter-individual variability in RF muscle depth and thickness, injection guidance should be considered for BoNT-A treatment in order to optimize the clinical outcome of treated patients. In particular, ultrasound guidance may help the clinicians in the long-term follow-up of muscle quality
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