7 research outputs found
L'enfant trouvé sous la toise
No full textColavolpe Isabelle. L'enfant trouvé sous la toise. In: Histoire, économie et société, 1987, 6ᵉ année, n°3. L'enfant abandonné. pp. 409-420
Princípios curriculares à luz da pedagogia histórico-crítica : as contribuições da obra de Dermeval Saviani
No full textO presente estudo, que tem como objeto de investigação a concepção de currículo na obra de
Dermeval Saviani, parte do pressuposto de que a educação tem um papel crucial no
desenvolvimento da humanidade: transmitir o legado histórico construído pelas gerações
precedentes às novas gerações. Considerando o grau de desenvolvimento da proposição
pedagógica histórico-crítica no quadro das ideias pedagógicas, seu caráter contra hegemônico
e a reconhecida importância que a obra de Dermeval Saviani ocupa no contexto educacional
brasileiro indagamos sobre a existência de uma concepção de currículo na obra deste autor.
Uma vez confirmada sua existência por meio da leitura preliminar da referida obra, objetivamos
identificar o grau de desenvolvimento desta concepção de currículo e quais as contribuições
(possibilidades) e os limites (realidade) para pensarmos o currículo da educação básica tendo
em vista a formação necessária à transição. Foram levantadas as seguintes hipóteses: 1) Existe
na obra de Dermeval Saviani elaborações acerca de uma concepção de currículo, que indicam
possibilidades reais para pensarmos o currículo da educação básica, objetivando a formação
necessária à transição para o socialismo haja vista que esta se situa no campo das teorias
educacionais críticas, de base teórica materialista histórica dialética, cuja tarefa é superar tanto
o poder ilusório (que caracteriza as teorias não-críticas) como a impotência (decorrente das
teorias crítico-reprodutivistas) das teorias educacionais; 2) Possivelmente a obra de Dermeval
Saviani contribui para que a discussão acerca do currículo da escola básica avance, pois, para a
análise do fenômeno educacional, o autor, vem historicamente considerando as questões
relativas à filosofia da educação, estrutura e política educacional, história da educação e teoria
pedagógica. Defendemos a tese que existe uma concepção de currículo na obra de Dermeval
Saviani e que esta indica possibilidades reais para pensarmos o currículo da escola básica na
perspectiva histórico-crítica, pois o autor analisa o fenômeno educacional considerando as
questões relativas à filosofia da educação, estrutura e política educacional, história da educação
e teoria pedagógica, fornecendo-nos, desta forma, uma sustentação consistente para o
enfrentamento do esvaziamento do currículo escolar na sociedade capitalista. Para alcançar o
objetivo proposto, nos valemos da teoria materialista histórico dialética, pois esta nos oferece
maiores possibilidades de apreender o real com radicalidade, se constituindo num instrumento
teórico para explicarmos a realidade e enfrentarmos as problemáticas que esta nos coloca.
Foram analisados 29 artigos, 06 livros e 07 capítulos de livro, no total 42 documentos
produzidos pelo autor. Foi possível sistematizar quadros representativos de uma dinâmica
curricular pautada na pedagogia histórico-crítica, aprofundando elementos acerca do trato com
o conhecimento, a organização escolar e normatização, especialmente no que diz respeito aos
princípios para a seleção e para o trato com o conhecimento nesta perspectiva.ABSTRACT
This study, which has object the investigation of curriculum conception in the academic
production of Dermeval Saviani, starts from the presupposition that education plays a crucial
role in the development of humanity: to transmit the historical legacy built by previous
generations to future generations. Considering the level of development of the historical-critical
pedagogical proposal in the context of pedagogical ideas, their character against hegemonic and
the recognized importance of the work of Dermeval Saviani occupies in the Brazilian
educational context seek to investigate the existence of a curriculum conception in the works
of this author, which once found through its preliminary reading, we tried to identify the level
of development of this curriculum design and what are the contributions (possibilities) and
limits (reality) to think the curriculum of basic education with a view to education needed to
transition. The following hypoteses were raised: 1) There is the work of Dermeval Saviani
elaborations about a curriculum conception that indicate real possibilities to think the
curriculum of basic education, aiming at the education necessary to transition to socialism given
that this lies between critical educational theories of historical materialist dialectic theoretical
base, whose task is to overcome both the illusory power (that characterizes the non-critical
theories) as the impotence (arising from critical-reproductivist theories) educational theories;
2) Possibly the work of Dermeval Saviani contributes to the discussion about the curriculum of
basic school advance because, for the analysis of the educational phenomenon, the author, has
historically considering the issues of educational philosophy, structure and educational politics,
history education and pedagogical theory. We defend the thesis that there is a curriculum
conception in the work of Dermeval Saviani and that this indicates real possibilities to think the
curriculum of basic school in the historical-critical perspectivebecause the author analyzes the
educational phenomenon considering questions relating to philosophy of education, structure
and educational politics, history of education and pedagogical theory, and in this way, a
consistent support for confronting the the school curriculum emptying in capitalist society. To
achieve the proposed objective, we base ourselves on historical materialist dialectic theory, as
this gives us greater possibilities of apprehending the real radically, constituting a theoretical
instrument for explain reality and face the problems that this puts us. Were analyzed 29 articles,
06 books and 07 book chapters, totaling 42 documents produced by the author. Was possible to
systematize representative frames of a dynamic curriculum backed up in the historical-critical
pedagogy, deepening elements on how to treat knowledge, school organization and
normatization, especially with regard to the principles for selection and to treat knowledge in
this perspective
Root nodule bacteria isolated from Lotus uliginosus for future use in phytostabilization of arsenic contaminated soils
No full textFunding Information: This work was supported by the cooperation project between Portugal and Argentina: 'The genus Lotus and their utilization for the restoration of soils contaminated with heavy metals. The biochemistry and their symbionts', FCT/DREBM 00264, Proc. 4.1.3 and also by the European project: 'Raising the bio-based industrial feedstock capacity of marginal Lands (Margin Up)', nº101082089. Publisher Copyright: © 2023 by the author(s).In recent decades there has been growing concern around heavy metals and metalloid contamination in soil. Arsenic (As) is a ubiquitous trace metalloid. The high levels of this metalloid in soils are a consequence of human activities and also from natural inputs. In general, the biodiversity of microorganisms and plants decreases drastically in contaminated soils. The knowledge that some leguminous plants, mainly certain species of Lotus, are growing well in such soils has attracted our attention for studying symbioses that are well adapted to harsh conditions. In this work we studied the rhizobial population existing in the root nodules of native Lotus uliginosus Sch. growing in a central region of Portugal. This legume grows in soils particularly affected by As due the discharge of industrial liquid effluents from fertilizer and chemical facilities. Diversity and tolerance to different concentrations of As of root nodule bacteria were studied. Our results showed that the symbioses between L. uliginosus and As tolerant Bradyrhizobium isolates were efficient when a nutrient medium containing high As concentrations was used. The present work highlights the capacity of L. uliginosus to grow and establish nitrogen-fixing symbioses in soils strongly contaminated with As and its potential for future use to promote vegetation cover to stabilize As contaminated soils.publishersversionpublishe
On the Achievable Rates of OFDM with Common Phase Error Compensation in Phase Noise Channels
No full textThis paper considers the problem of analytically assessing the maximum achievable rates (capacity) of orthogonal frequency division multiplexing (OFDM) transmissions when the receiver, for complexity reasons, only accounts for the common phase error (CPE) effect due to phase noise impairments with inter-carrier interference (ICI) treated as noise. By recognizing that the functional form of the CPE with respect to the phase noise realization is actually a free design parameter, determination of the capacity is posed as a functional optimization problem with respect to the, so-called, CPE function. A simple lower bound of the capacity is obtained, revealing the performance degradation due to the unknown CPE at the receiver, as well as the suboptimal performance achieved in severe phase noise conditions by the conventional CPE function that is routinely employed in previous works. The existence of an optimal number of subcarriers that balances the effects of the (unknown) CPE and ICI is highlighted and critical system design/operation issues, such as selection of the CPE function and effect of unknown channel on the achievable rate, are discussed. The analysis in this paper can be employed for determining the suitability of OFDM in phase noise channels and provides a tractable utility function for resource allocation purposes.Manuscript received October 7, 2016; revised February 10, 2017 and May 5, 2017; accepted May 6, 2017. Date of publication May 17, 2017; date of current version August 14, 2017. This research work was made possible by grant number NPRP 6-1326-2-532 from the Qatar National Research Fund, QNRF (a member of the Qatar Foundation, QF). The statements made herein are the sole responsibility of the authors. The associate editor coordinating the review of this paper and approving it for publication was G. Colavolpe. (Corresponding author: Stelios Stefanatos.) S. Stefanatos is with the Department of Digital Systems, University of Piraeus, 18534 Piraeus, Greece (e-mail: [email protected]).Scopu
