On knowledge and aesthetics: some learning experiences for a possible high school

El presente trabajo reporta parte de dos procesos de indagación sobre dos experiencias educativas: una escuela secundaria de la ciudad de Santa Fe y una propuesta lúdico–pedagógica dependiente del Ministerio de Innovación y Cultura de la Provincia de Santa Fe. Se consideran relevantes de ser estudiadas por los modos, disposiciones y decisiones que van desplegando con el sentido de habilitar prácticas de formación amplias. Ambas permiten pensar en la escuela secundaria desde recorridos inéditos que convocan sensibilidades, estéticas y saberes en procesos de subjetivación. Los dos estudios se sostienen en una perspectiva cualitativa en tanto se proponen comprender e interpretar la complejidad de sus objetos, antes que confirmar presupuestos y pretender explicaciones totalizantes. El artículo procura describir parte de la riqueza que implicaron estos recorridos. Para ello, una primera parte presenta el encuadre general y común que los vincula. Una segunda, describe particularidades, interrogantes y referentes categoriales centrales, así como los rasgos relevantes reportados en cada trabajo empírico. Finalmente, se comparten reflexiones construidas al calor de ambas experiencias de estudio, las que se proponen como posibles direcciones otras para la escuela secundaria.This paper reports part of two processes of inquiry about two educational experiences: a high school in the city of Santa Fe and a pedagogical proposal of the Ministry of Innovation and Culture of the Province of Santa Fe. They are considered relevant to be studied by the modes, dispositions and decisions that are deploying with the sense of enabling broad training practices. Both suggest the possibility of thinking in high school from unpublished tours that sensitivities, aesthetics and knowledge in processes of subjectivation. The two studies were held in a qualitative perspective as they intend to understand and interpret the complexity of their objects, rather than confirm budgets and claim totalizing. The article attempts to describe part of the wealth implied by these routes. To do this, the first part presents general and common frame which links them. A second one, describes particularities, questions and central categorical referents, as well as the relevant features reported in each empirical work. Finally, reflections built in the heat of both study experiences are shared, which are proposed as possible directions for the secondary school

The number of integer polynomials whose discriminants are divided by a large prime power

Сформулирована теорема о верхней оценке количества целочисленных полиномов с ограничением на дискриминанты

АЛГЕБРАИЧЕСКИЕ ЧИСЛА ВО МНОЖЕСТВАХ ДЕЙСТВИТЕЛЬНЫХ И КОМПЛЕКСНЫХ ЧИСЕЛ МАЛОЙ МЕРЫ ЛЕБЕГА

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Mechanochemical synthesis of multiferroic yttrium manganite

Multiferroic yttrium manganite (YMnO3) is known as a material that exhibits both ferromagnetic and ferroelectric properties making it interesting for various technological applications. In this work single-phased YMnO3 was prepared for the first time by mechanochemical synthesis in a planetary ball mill. The YMnO3 can be formed directly from the highly activated constituent oxides, Y2O3 and Mn2O3, after 60 min of milling time and subsequently grows during prolonged milling. The cumulative energy introduced into the system during milling for 60 min was 86 kJ/g. X-ray analysis indicates that the as-prepared samples crystallize majority with hexagonal (P63cm) and minorly with orthorhombic (Pnma) YMnO3 structure. The morphology, structure and chemical composition of the powder were investigated by SEM with EDS and TEM. The magnetic properties of the obtained YMnO3 powders were found to change as a function of milling time in a manner consistent with the variation in the nanocomposite microstructure

Information security: Listening to the perspective of organisational insiders

Aligned with the strategy-as-practice research tradition, this article investigates how organisational insiders understand and perceive their surrounding information security practices, how they interpret them, and how they turn such interpretations into strategic actions. The study takes a qualitative case study approach, and participants are employees at the Research & Development department of a multinational original brand manufacturer. The article makes an important contribution to organisational information security management. It addresses the behaviour of organisational insiders – a group whose role in the prevention, response and mitigation of information security incidents is critical. The article identifies a set of organisational insiders’ perceived components of effective information security practices (organisational mission statement; common understanding of information security; awareness of threats; knowledge of information security incidents, routines and policy; relationships between employees; circulation of stories; role of punishment provisions; and training), based on which more successful information security strategies can be developed

Protection of early phase hepatic ischemia-reperfusion injury by cholinergic agonists

BACKGROUND: Cytokine production is critical in ischemia/reperfusion (IR) injury. Acetylcholine binds to macrophages and inhibits cytokine synthesis, through the cholinergic anti-inflammatory pathway. This study examined the role of the cholinergic pathway in cytokine production and hepatic IR- injury. METHODS: Adult male mice underwent 90-min of partial liver ischemia followed by reperfusion. The AChR agonists (1,1-dimethyl-4-phenyl-L-pioperazinium-iodide [DMPP], and nicotine) or saline-vehicle were administered i.p. before ischemia. Plasma cytokine tumor necrosis factor (TNF)-α, macrophage inflammatory protein-2, and Interleukin-6 were measured. Liver injury was assessed by plasma alanine transaminase (ALT) and liver histopathology. RESULTS: A reperfusion time-dependent hepatocellular injury occurred as was indicated by increased plasma-ALT and histopathology. The injury was associated with marked elevation of plasma cytokines/chemokines. Pre-ischemic treatment of mice with DMPP or nicotine significantly decreased plasma-ALT and cytokines after 3 h of reperfusion. After 6 h of reperfusion, the protective effect of DMPP decreased and reached a negligible level by 24 h of reperfusion, despite significantly low levels of plasma cytokines. Histopathology showed markedly diminished hepatocellular injury in DMPP- and nicotine-pretreated mice during the early-phase of hepatic-IR, which reached a level comparable to saline-treated mice at late-phase of IR. CONCLUSION: Pharmacological modulation of the cholinergic pathway provides a means to modulate cytokine production and to delay IR-induced heaptocellular injury