MOFs basados en CuII-PDC-bpe (PDC= 2,5-piridindicarboxilato, bpe= 1,2-di(4piridil)eteno): Cristaloquímica de redes 2D tipo Herringbone

Comunicación a congreso (póster): XXIV Simposio del Grupo Especializado de Cristalografía y Crecimiento Cristalino, GE3C. 23-26 de junio de 2014, Bilbao

Semblanzas Ictiológicas: Cecilia Yanina Di Prinzio

A través de esta serie intentaremos conocer diferentes facetas personales de los integrantes de nuestra “comunidad”. El cuestionario, además de su principal objetivo, con sus respuestas quizás nos ayude a encontrar entre nosotros puntos en común que vayan más allá de nuestros temas de trabajo y sea un aporte a futuros estudios históricos. Esperamos que esta iniciativa pueda ser otro nexo entre los ictiólogos de la región, ya que consideramos que el resultado general trascendería nuestras fronteras.

A dor que dói na escola: psicanálise e educação no século XXI

A presente pesquisa nasce da inserção de uma psicóloga em formação psicanalítica em escolas municipais da cidade do Rio de Janeiro. Nosso ponto de partida é a expansão dos diagnósticos de Déficit de Atenção e Hiperatividade em crianças em idade escolar e de Burnout em professores. O reconhecimento de que tais diagnósticos são nomes correntes na atualidade para nomear a dor que dói na escola permite que nos questionemos sobre as mudanças no campo da cultura e suas repercussões na tarefa educativa na escola. Para construirmos uma leitura sobre o mal-estar na escola em nossa época, recorremos à psicanálise enquanto instrumento primordial. Nossa investigação se inicia em Freud e suas diversas concepções de educação, desde a noção de moral sexual civilizada até admissão da educação enquanto uma tarefa necessária e impossível, causadora do mal-estar. Logo em seguida, abordamos a releitura de Freud feita por Lacan a partir da teoria dos discursos. Passamos, assim, à educação enquanto laço social. Verificamos o quanto Lacan avança ao distinguir o discurso do mestre como discurso de entrada na linguagem, a partir do qual os outros discursos são possíveis. O discurso do mestre escreve a operação permanente em toda civilização, sem que isso indique a imutabilidade do Outro. Ao nos indagarmos sobre a delimitação do Outro em nossa época, reconhecemos a importância do discurso da ciência e do capitalista, assim como o Outro nãotodo. Com essas chaves de leitura, questionamo-nos sobre o lugar da criança na cultura hoje e sobre os significantes-mestres das atuais políticas públicas para a educação, aproximando-nos do mal-estar na escola. Sustentados por essas ferramentas, terminamos por nos indagar sobre a prática da psicanálise nas instituições escolares, desvendando que a partir das (re)invenções da psicanálise, há na escola um lugar possível para o psicanalista.

Enzymatic activities in constructed wetlands and di-n-butyl phthalate (DBP) biodegradation

The bioaccumulation of phthalate acid esters (PAEs) from industrial products and their mutagenic action has been suggested to be a potential threat to human health. The effects of the most frequently identified PAE, Di-n-butyl phthalate (DBP), and its biodegradation, were examined by comparison of two small scale plots (SSP) of integrated vertical-flow constructed wetlands. The influent DBP concentration was 9.84 mg l(-1) in the treatment plot and the control plot received no DBP. Soil enzymatic activities of dehydrogenase, catalase, protease, phosphatase, urease, cellulase, beta-glucosidase, were measured in the two SSP after DBP application for 1 month and 2 months, and 1 month after the final application. Both treatment and control had significantly higher enzyme activity in the surface soil than in the subsurface soil (P < 0.001) and greater enzyme activity in the down-flow chamber than in the up-flow chamber (P < 0.05). In the constructed wetlands, DBP enhanced the activities of dehydrogenase, catalase, protease, phosphatase and inhibited the activities of urease, cellulase and beta-glucosidase. However, urease, cellulase, beta-glucosidase activities were restored 1 month following the final DBP addition. Degradation of DBP was greater in the surface soil and was reduced in sterile soil, indicating that this process may be mediated by aerobic microorgansims. DBP degradation fitted a first-order model, and the kinetic equation showed that the rate constant was 0.50 and 0.17 d(-1), the half-life was 1.39 and 4.02 d, and the r(2) was 0.99 and 0.98, in surface and subsurface soil, respectively. These results indicate that constructed wetlands are able to biodegrade organic PA-Es such as DBP. (c) 2005 Elsevier Ltd. All rights reserved.

Homogeneous Epitaxial Growth of N,N '-di(n-butyl)quinacridone Thin Films on Ag(110)

The structural evolution of the ordered N-N' dibutyl-substituted quinacridone (QA4C) multilayers (3 MLs) has been monitored in situ and in real time at various substrate temperatures using low energy electron diffraction (LEED) during organic molecular beam epitaxy (MBE). Experimental results of LEED patterns clearly reveal that the structure of the multilayer strongly depends on the substrate temperature. Multilayer growth can be achieved at the substrate temperatures below 300 K, while at the higher temperatures we can only get one ordered monolayer of QA4C. Two kinds of structures, the commensurate and incommensurate one, often coexist in the QA4C multilayer. With a method of the two-step substrate temperatures, the incommensurate one can be suppressed, and the commensurate, on the other hand, more similar to the (001) plane of the QA4C bulk crystal, prevails with the layer of QA4C increasing to 3 MLs. The two structures in the multilayers are compressed slightly in comparison to the original ones in the first monolayer.

基于IPv6的Winsock网络编程

介绍了下一代网络通讯协议IPv6 (Internet Protocol Version 6)的概况,阐述了IPv6下Winsock网络编程的基本步骤,并给出了Windows XP环境下利用Visual C++.net开发基于IPv6 的网络通讯程序的关键性程序代码。

Di-nuclear systems studied with the velocity filter SHIP

Various nuclear reactions like quasi-fission, fusion-fission or particle and cluster evaporation from excited compound nuclei were studied in heavy-ion reactions at the velocity filter SHIP of GSI. The velocity filter offers the possibility to detect all reaction products under zero degree relative to the beam direction. Together with the measurement of the product velocity distribution this allows for an identification of the underlying reaction mechanism. This article is focussed on reactions of Mg-25 and Ni-64 beams on Pb-206,Pb-207 targets at energies of 5.9 x A MeV and 8.7 x A MeV. Besides evaporation residues from Mg-25 + Pb-206 collisions we found evidence for rotation and quasi-fission of nuclear molecules formed in the entrance channel after the capture stage. The break-up of the systems showed a preferred clustering leading to isotopes in the region 84 <= Z <= 88 and 122 <= N <= 127 of the chart of nuclei.