Suitability of leguminous cover crop pollens as food source for the green lacewing Chrysoperla externa (Hagen) (Neuroptera: Chrysopidae).

Diversification of crops with species that provide suitable pollen for predators may reduce pest population on crops by enhancing predator effectiveness. In this paper we evaluated the suitability of leguminous cover crop pollens to the predatory green lacewing Chrysoperla externa (Hagen). The predator is commonly found in coffee agroecosystems and the plant species tested were pigeon pea and sunn hemp, which are used in organic coffee systems. Newly emerged females and males of C. externa were reared on diets containing pollen of pigeon pea, sunn hemp, or castor bean, used as a control. The reproductive success of C. externa was evaluated when females fed the pollen species and when honey was added to the diets, to verify the predator need for an extra carbohydrate source. Similar intrinsic growth rates were found for females fed on pigeon pea pollen and on sunn hemp pollen but these rates increased significantly when honey was added to the diets. Females fed with pigeon pea pollen plus honey and with sunn hemp pollen plus honey had higher intrinsic growth rates than those fed with castor bean pollen plus honey. Females fed on castor bean pollen only or on honey only, did not oviposit. Leguminous pollen species were equally suitable for C. externa especially when they were complemented with honey. The results suggest that to successfully enhance predator effectiveness, organic coffee plantation should be diversified with plant providing pollen in combination with plant providing nectar

Manipulation of Magnetic Skyrmions by Superconducting Vortices in Ferromagnet-Superconductor Heterostructures

Dynamics of magnetic skyrmions in hybrid ferromagnetic films harbors novel physical phenomena and holds promise for technological applications. In this work, we discuss the behavior of magnetic skyrmions when coupled to superconducting vortices in a ferromagnet-superconductor heterostructure. We use numerical simulations and analytic arguments to reveal broader possibilities for manipulating the skyrmion-vortex dynamic correlations in the hybrid system, that are not possible in its separated constituents. We explore the thresholds of particular dynamic phases, and quantify the phase diagram as a function of the relevant material parameters, applied current and induced magnetic torques. Finally, we demonstrate the broad and precise tunability of the skyrmion Hall-angle in presence of vortices, with respect to currents applied to either or both the superconductor and the ferromagnet within the heterostructure

Signature of the interaction between dark energy and dark matter in observations

We investigate the effect of an interaction between dark energy and dark matter upon the dynamics of galaxy clusters. This effect is computed through the Layser-Irvine equation, which describes how an astrophysical system reaches virial equilibrium and was modified to include the dark interactions. Using observational data from almost 100 purportedly relaxed galaxy clusters we put constraints on the strength of the couplings in the dark sector. We compare our results with those from other observations and find that a positive (in the sense of energy flow from dark energy to dark matter) non vanishing interaction is consistent with the data within several standard deviations.Comment: 13 pages, 3 figures; matches PRD published versio

Uma metodologia de apoio à seleção de softwares educativos para o ensino de matemática

En virtud del intenso desarrollo de productos de software educativos hoy, la selección de esos productos por los maestros ha se tornado una tarea cada vez más difícil. Argumentamos en este trabajo que mismo existiendo innúmeras estrategias de evaluación ellas no son efectivamente aplicadas para realizar una selección basada en la comparación de los rasgos de los productos de software evaluados. En este sentido, presentamos un nuevo abordaje para la evaluación de productos de software educativo. En este abordaje proponemos una metodología que tiene como objectivo principal permitir la selección de productos de software educativo que tengan rasgos funcionales semejantes, por medio del uso de métricas definidas por el propio evaluador y que son basadas en la teoría de los campos conceptuales y formalizadas utilizando la técnica de puntos de casos de uso.Em virtude ao intenso desenvolvimento de produtos de software educativo atualmente, a seleção desses produtos pelos professores tem se tornado uma tarefa cada vez mais difícil. Argumentamos nesse trabalho que mesmo existindo inúmeras estratégias de avaliação elas não são efetivamente aplicadas para realizar uma seleção baseada na comparação das características dos produtos de software avaliados. Nesse sentido, apresentamos uma nova abordagem para a avaliação de produtos de software educativo. Nessa abordagem propomos uma metodologia que tem como objetivo principal permitir a seleção de produtos de software educativo que possuam características funcionais semelhantes, através da utilização de métricas definidas pelo próprio avaliador e que são baseadas na teoria dos campos conceituais e formalizadas utilizando a técnica de pontos de casos de uso.Due to the intense product development educational software currently, the selection of these products by the teachers has become an increasingly difficult task. We argue in this paper that even though there are numerous assessment strategies they are not effectively applied to filter based on the comparison of the characteristics of software products evaluated. In this sense, we present a new approach for the evaluation of educational software products. In this approach we propose a methodology that aims to allow the selection of educational software products that have similar functional characteristics through the use of metrics defined by the evaluator itself and that are based on the theory of conceptual fields and formalized using the point technique use cases

The efficient and final causes of the spiritual power in the D. Friar Álvaro Pais’ sigth

In this study, based in the main political works of D. Fr. Alvarus Pelagius O. Min. (c. 1270- c.1350) we analyze his conception on the origin or efficient cause of the spiritual power and, also, his thought about the finality or final cause of the mentioned power. Referring to the first topic, the Bishop of Silves wants principally refutes some Marsilius of Padua’s thesis contained in the Second Dictio of his Defensor Pacis, completely different of the theology of the catholic priesthood and their hierarchic degrees and the Peter’s Primacy. With this purpose, ad litteram, he bases, between other sources, specially, in James’ of Viterbo OSA De regimine christiano (1301). Concerning the finality of the spiritual power, on the one hand, Alvarus supports the Church’s traditional thought about this matter and, the other hand, by consequence, as member and defender of the hierocratic thought, he defends the thesis according which, in the Societas Christiana, the priests, the bishops and, principally, the Roman Pontiff hold the most important position concerning the secular rulers.In this study, based in the main political works of D. Fr. Alvarus Pelagius O. Min. (c. 1270- c.1350) we analyze his conception on the origin or efficient cause of the spiritual power and, also, his thought about the finality or final cause of the mentioned power. Referring to the first topic, the Bishop of Silves wants principally refutes some Marsilius of Padua’s thesis contained in the Second Dictio of his Defensor Pacis, completely different of the theology of the catholic priesthood and their hierarchic degrees and the Peter’s Primacy. With this purpose, ad litteram, he bases, between other sources, specially, in James’ of Viterbo OSA De regimine christiano (1301). Concerning the finality of the spiritual power, on the one hand, Alvarus supports the Church’s traditional thought about this matter and, the other hand, by consequence, as member and defender of the hierocratic thought, he defends the thesis according which, in the Societas Christiana, the priests, the bishops and, principally, the Roman Pontiff hold the most important position concerning the secular rulers.Neste estudo, com base nos principais escritos políticos de D. Frei Álvaro Pais O. Min. (c. 1270- c.1350) analisamos sua concepção a respeito da origem ou causa eficiente do poder espiritual e, igualmente, seu pensamento no tocante à finalidade ou causa final do referido poder. Quanto ao primeiro tópico, o Bispo de Silves quer principalmente refutar algumas das teses de Marsílio de Pádua contidas na 2ª Parte do seu Defensor da Paz, completamente opostas à teologia do sacerdócio católico e seus graus hierárquicos e à do Primado Petrino. Para tanto, quase literalmente, haure-se, entre outras fontes, particularmente no De regimine christiano (1301) de Tiago de Viterbo OSA. Com respeito à finalidade do poder sacerdotal, de um lado, Álvaro sustenta a doutrina tradicional da Igreja a seu respeito e, de outro, em conseqüência, como partidário da hierocracia, defende a tese de que na, Societas Christiana, os detentores do poder espiritual, particularmente o Sumo Pontífice, ocupam uma posição mais eminente em relação aos governantes seculares

Origins of the Imperial and Secular Power according Ockham’s Political Thought

Neste artigo, fundamentado nos principais escritos de Guilherme de Ockham, O. Min. (c. 1285–1347), analisamos sua concepção a respeito das origens dos poderes imperial e secular. Ancorado no versículo paulino omnis potestas a Deo, mas ampliado, sed per homines e, igualmente, nas ideias dos confrades que o antecederam, os quais relacionaram entre si os conceitos proprietas e dominium, com vista a explicar as origens humanas dos mesmos, de um lado, ele rebate tanto a teoria hierocrata quanto a de Marsílio de Pádua, relativas ao tema em exame e, de outro, oferece sua contribuição ao mesmo, mediante a qual, nem o Império nem os Estados estão completamente subordinados à Igreja, nem esta está submissa ao poder terreno, porque, quanto às origens de ambos, a Igreja tem uma procedência divina e os Estados e o Império têm imediatamente uma origem humana e, ainda, porque nas esferas respectivas de atuação, os poderes espiritual e secular independem um do outro.In this article, based on the most important William of Ockham’s O. Min. (c. 1285 – 1347) writings, we analyze his ideias concerning the origins of the imperial and secular power. Founded in the Paul’s doctrine omnis potestas a Deo, but enlarged, per homines, and also on the ideas of his Franciscan brothers which lived before, which articulated the concepts of proprietas and domininum, in order to explain the human origins of the both, on the one hand, Ockham refuses not only the hierocratic theory, but also Marsilius of Padua thought about this subject, and, on the other hand, he offers his contribution for this subject, according with which, nor the Empire neither the Estates are completely subordinated to the Church, nor the Church is subordinated for the secular power, because, referring its origins, both, Church and Estates are different origins, the first has a divine proceeding, the others, are immediately a human provenance and, because, in its specific spheres of action the spiritual power and the secular power do not depend one of the other and vice versa.In this article, based on the most important William of Ockham’s O. Min. (c. 1285 – 1347) writings, we analyze his ideias concerning the origins of the imperial and secular power. Founded in the Paul’s doctrine omnis potestas a Deo, but enlarged, per homines, and also on the ideas of his Franciscan brothers which lived before, which articulated the concepts of proprietas and domininum, in order to explain the human origins of the both, on the one hand, Ockham refuses not only the hierocratic theory, but also Marsilius of Padua thought about this subject, and, on the other hand, he offers his contribution for this subject, according with which, nor the Empire neither the Estates are completely subordinated to the Church, nor the Church is subordinated for the secular power, because, referring its origins, both, Church and Estates are different origins, the first has a divine proceeding, the others, are immediately a human provenance and, because, in its specific spheres of action the spiritual power and the secular power do not depend one of the other and vice versa

Fischer-Tropsch synthesis in microchannels

Different metallic supports (aluminum foams of 40ppi, honeycomb monolith and micromonolith of 350 and 1180cpsi, respectively) have been loaded with a 20%Co-0.5%Re/γ-Al2O3 catalyst by the washcoating method. Layers of different thicknesses have been deposited onto the metallic supports. The catalytic coatings were characterized measuring their textural properties, adhesion and morphology. These structured catalysts have been tested in the Fischer-Tropsch synthesis (FTS) and compared with a microchannel block presenting perpendicular channels for reaction and cooling. The selectivity depends on the type of support used and mainly on the thickness of the layer deposited. In general, the C5+ selectivity decreased at increasing CO conversion for all of the systems (powder, monoliths, foams and microchannels block). On the other hand, the selectivity to methane increased with the thickness of the catalytic layer due to the higher effective H2/CO ratio over the active sites resulting from the higher diffusivity of H2 compared with CO in the liquid products filling the pores. The C5+ selectivity of the microchannels reactor is higher than that of the structured supports and the powder catalyst.Ministerio de Ciencia e Innovación MAT2006-12386-C05, ENE2009-14522-C0

Percepções de pacientes sobre catarata

OBJECTIVE: To identify in adult patients suffering from cataract the perceptions regarding the disease and its surgical treatment. MATERIALS AND METHODS: An exploratory survey was conducted among adult patients suffering from cataract and participating in a large-scale cataract management program at the University of São Paulo General Hospital in 2004. The interviews were conducted by research assistants previously trained to pose questions and record answers. RESULTS: The sample consisted of 170 men and women (43.5% and 56.5%, respectively), aged between 40 and 88 years. Of the 170 participants, 43.5% were from the State of São Paulo, 14.7% from the State of Bahia, 12.4% from the State of Minas Gerais, 5.9% from the State of Pernambuco, 1.8% from other countries, and the remaining 21.7% were from other Brazilian states. Of those who were actively working (n = 87), 43.7% had an occupational level corresponding to nonspecialized manual labor, 27.6% were in specialized manual labor jobs, 25.3% had routine nonmanual occupations, 1.1% supervised manual labor, and 2.3% had low-ranking supervision or inspection jobs over nonmanual occupations. Of those who were not actively working (n = 82), 53.6% were retired, 45.2% were housewives, and 1.2% were unemployed. Concerning conceptions about cataract, 79.0% referred to it as "a small skin fold that gradually covers the eye" and 32.4% mentioned, in addition, other conceptions. Concerning the cause, of the alternatives presented to them, 80% reported aging, 47.1% blamed "overusing the eyes in the workplace or at home", 7.1% believed they had cataract due to some kind of "spell." Of the associated answers, 94.1% referred to "blurred vision" in people suffering from cataract, 72.4% thought the person may become blind, and 66.5% believed that the patients suffering from cataract are depressed because they cannot see. Regarding surgery, 28.8% were afraid of undergoing surgery; of those, 16.3% cited with the fear of dying during surgery, 55.1% thought they might become blind, 40.8% believed the surgery would be painful, and 8.2% followed religious practices that do not permit surgery. CONCLUSION: Some misconceptions were identified, and the fear of blindness was the most mentioned reason for not seeking cataract surgery, which indicates the need for orientation.OBJETIVO: Identificar percepções de adultos portadores de catarata em relação à doença e ao tratamento cirúrgico. MATERIAIS E MÉTODOS: Foi realizada uma pesquisa exploratória entre pacientes adultos portadores de catarata presentes em mutirão em hospital universitário no ano de 2004. Auxiliares de pesquisa previamente treinados para formulação das questões e registros das respostas, encarregaram-se das entrevistas. RESULTADOS: A amostra foi composta por 170 sujeitos de ambos os sexos (43,5% do sexo masculino e 56,5% do sexo feminino) com idade entre 40 e 88 anos. Dos 170 participantes, 43,5% eram nascidos no estado de São Paulo, 14,7% na Bahia, 12,4% em Minas Gerais, 1,8% nasceram em outros paises e os demais sujeitos, em outros estados brasileiros.Da população ativa no mercado de trabalho (n=87), encontravam-se em nível de ocupação manual não especializada 43,7%; ocupação manual especializada 27,6%; ocupação de rotina não manual 25,3%; supervisão de trabalho manual 1,1%; posição baixa de supervisão ou inspeção , considerando ocupações não manuais,2,3 %. Entre a população inativa no mercado de trabalho (n=82), 53,6% eram aposentados, 45,2% donas de casa e 1,2% desempregados. Em relação a concepção sobre catarata, 79,0% referiram ser uma "pelezinha que vai cobrindo os olhos" e 32,4% além da "pelezinha", mencionaram outras concepções. Em relação a causa , entre as opções fornecidas, 80% relacionam a velhice; 47,1% "por usar muito as vistas no serviço ou em casa"; 7,1% acreditam que tem catarata devido a "mau olhado". Dentre as respostas associadas, 94,1% referiram que a "visão fica embaçada" na pessoa que tem catarata, 72,4% acham que a pessoa pode ficar cega e 66,5% acham que os portadores de catarata ficam com depressão por não enxergarem. Vinte e oito por cento tem medo de se submeter a cirurgia, desses, 16,3% atribuem ao fato de poderem morrer na cirurgia; 55,1% acham que podem ficar cego; 40,8% crêem que a cirurgia dói e 8,2% tem medo de operar pois a religião não permite. CONCLUSÃO: Foram evidenciados alguns conhecimentos incorretos, o medo de ficar cego se fez presente entre as razões para não operar a catarata, indicando necessidade de provimento de orientação

As implicações dos erros conceituais na aprendizagem da matemática

Este artigo trata das implicações dos erros conceituais no ensino da matemática, focando principalmente o seu aspecto genealógico, utilizado as suas características peculiares, onde todo trabalho que se desenvolve está diretamente ligado a filosofia e história da Matemática, Psicologia, Pedagogia e a própria Matemática. Desta forma, procura esclarecer algumas dificuldades de aprendizagens especificando as suas particularidades. Propõem meios de investigação, oferecendo informações pertinentes a cerca da metodologia utilizada em sala de aula, destacando principalmente a forma que o aluno aprende, e a forma como o professor ensina. Viabiliza que é importante o uso de uma prática pedagógica mais eficaz, ao qual o professor deve procurar ao máximo diversificar o exercício didático, de forma que este possa atingir a todos os discentes, de forma que a sua metodologia possa significar a ponte entre as dificuldades mencionadas e a aprendizagem. Dessa forma, procura-se amenizar as dificuldades existentes nos discentes de forma onde os mesmos possam utilizar os seus próprios erros como uma ferramenta de aprendizagem