Reformulation of variational inequalities on a simplex and compactification of complementarity problems

Many variational inequality problems (VIPs) can be reduced, by a compactification procedure, to a VIP on the canonical simplex. Reformulations of this problem are studied, including smooth reformulations with simple constraints and unconstrained reformulations based on the penalized Fischer-Burmeister function. It is proved that bounded level set results hold for these reformulations under quite general assumptions on the operator. Therefore, it can be guaranteed that minimization algorithms generate bounded sequences and, under monotonicity conditions, these algorithms necessarily nd solutions of the original problem. Some numerical experiments are presented.

An extended query-the-user tool for expert systems

An extended version of HIER, a query-the-user facility for expert systems is presented. HIER was developed to run over Prolog programs, and has been incorporated to systems that support the design of large and complex applications. The framework of the extended version is described,; as well as the major features of the implementation. An example is included to illustrate the use of the tool, involving the design of a specific database application.

The reformulation of nonlinear complementarity problems using the Fischer-Burmeister function

A bounded-level-set result for a reformulation of the box-constrained variational inequality problem proposed recently by Facchinei, Fischer and Kanzow is proved. An application of this result to the (unbounded) nonlinear complementarity problem is suggested. © 1999 Elsevier Science Ltd. All rights reserved.

Optimization of query results in peer-to-peer database supported by semantics

The development of new technologies that use peer-to-peer networks grows every day, with the object to supply the need of sharing information, resources and services of databases around the world. Among them are the peer-to-peer databases that take advantage of peer-to-peer networks to manage distributed knowledge bases, allowing the sharing of information semantically related but syntactically heterogeneous. However, it is a challenge to ensure the efficient search for information without compromising the autonomy of each node and network flexibility, given the structural characteristics of these networks. On the other hand, some studies propose the use of ontology semantics by assigning standardized categorization of information. The main original contribution of this work is the approach of this problem with a proposal for optimization of queries supported by the Ant Colony algorithm and classification though ontologies. The results show that this strategy enables the semantic support to the searches in peer-to-peer databases, aiming to expand the results without compromising network performance. © 2011 IEEE.

Reformulation and a Lagrangian heuristic for lot sizing problem on parallel machines

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Allelopathic plants. 7. Sunflower (Helianthus annuus L.)

Sunflower is an annual dicotyledonous plant, herbaceous, erect and native of North America. It is thermo- and photo-insensitive, hence, can be grown round the year in sub-tropical and tropical countries. Only two spp. H. annuus and H. tuberosum are cultivated for food, remaining spp. are ornamentals, weeds and wild plants. However, H. annuus is allelopathic and inhibit the growth and development of other plants thus reducing their productivity. Much information is available about the allelopathic effects of sunflower crop on following crops in crop rotations. Although it is harmful to all crops, but, is less harmful to crops of Graminae family than other families. It seems that the harmful effects of sunflower in crop rotations are due to release and accumulation of root exudates during crop growth in soil. Soil incorporation of its fresh (green manure) or dry biomass in soil is inhibitory to both crops and weed spp. Several allelochemicals have been characterized from the H. annuus, which inhibit the seed germination and seedling growth of A. albus, A. viridis, Agropyron repens (Elymus repens), Ambrosia artemsiifolia, Avena fatua, Celosia crustata, Chenopodium album, Chloris barbara, Cynodon dactylon, D. sanguinalis, Dactyloctenium ageyptium, Digitaria ciliaris, Echinochloa crus-galli, Flaveria australasica, Parthenium hysterophorus, Portulaca oleracea, Sida spinosa, Trianthema portulacastrum, Veronica perisca the inhibitory effects of this crop may be used for weed management with less herbicides for sustainable agriculture.

A correção como procedimento de reformulação em chat educacional escrito em espanhol por brasileiros: tipos de operacionalização e marcas

O objetivo deste artigo foi analisar, nas interações realizadas por escrito dentro de um chat educacional, os tipos de operacionalização para o processo da correção - enquanto procedimento de reformulação, de acordo com a Perspectiva Textual-Interativa. O corpus, constituído por 31 sessões e por 17 participantes (1 professor e 16 alunos), mostrou a presença de quatro tipos de operacionalização da correção: autocorreção autoiniciada, autocorreção heteroiniciada, heterocorreção autoiniciada e heterocorreção heteroiniciada. O maior número de ocorrências foi o da autocorreção autoiniciada. Esse resultado sugere que: i) os participantes, nesse contexto, parecem se preocupar em preservar a auto-imagem, já que a correção não era essencial à compreensão do texto; ii) os escreventes conhecem as regras e, por isso, se monitoram; iii) a própria ferramenta chat contribui para a autocorreção autoiniciada; e iv) a preferência pela autocorreção autoiniciada parece evitar que o professor assuma o papel de corretor do curso de língua. Foram identificados, ainda, padrões de reformulação com e sem marcadores inscritos na materialidade do texto.

A organização do conhecimento arquivístico: perspectivas de renovação a partir das abordagens científicas canadenses

Desde o final do século XX, as novas formas de produção documental e as novas tecnologias de informação apresentadas à Arquivística têm levado os profissionais da informação a repensar os conceitos e princípios arquivísticos postulados nos antigos manuais da área. Nesse contexto, destaca-se a produção arquivística canadense, que transformou o país em solo fértil para as discussões que circundam a disciplina na contemporaneidade, representando muito bem as necessidades colocadas pelos novos meios de produção documental aos arquivistas na sociedade da informação, redescobrindo princípios e (re) definindo conceitos, métodos e critérios para a criação, manutenção e uso de documentos em meio tradicional e eletrônico. Foi notadamente na década de 1980, que um novo paradigma se enunciou na área e, a partir dele, três correntes emergiram: a Arquivística Integrada - enunciada pela Escola de Québec - que propõe a reintegração da disciplina por meio do ciclo vital dos documentos e uma possível aproximação com a Ciência da Informação, graças à incorporação do termo informação orgânica registrada, como substituição ao termo documento de arquivo; a Arquivística Funcional ou Pós-Moderna, enunciada por Terry Cook - que propõe uma renovação e reformulação dos princípios e conceitos originais da disciplina, adotando a corrente Pós-moderna como pano de fundo; e a Diplomática Arquivística, enunciada primeiramente na Itália por Paola Carucci, mas desenvolvida e reformulada na América do Norte por Luciana Duranti, que busca, por meio do estudo da Diplomática, estabelecer critérios para a crítica textual dos documentos contemporâneos, garantindo ao método diplomático um posto fundamental na Arquivística contemporânea. A vista de tais aspectos, analisa-se, comparativamente, o universo epistemológico dessas três abordagens arquivísticas canadenses, enquanto perspectivas emergentes para a construção de uma disciplina contemporânea, capaz de dar conta dos novos processos de produção, organização e uso da informação orgânica registrada.

Identification and expression analysis of microRNAs and targets in the biofuel crop sugarcane

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Morphohistological study of testicles of the Brazilian diplopod Pseudonannolene tricolor Brolemann, 1901 (Pseudonannolenidae, Pseudonannolenida)

:The morphology and histology of testicles of the Brazilian species of diplopod Pseudonannolene tricolor Brolemann, 1901 are presented. The study is based in testicular vesicles that show differentiated spermatozoa in their interior.

Profiling the Proteome of the Venom from the Social Wasp Polybia paulista: A Clue to Understand the Envenoming Mechanism

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Immunodominant Antigens of Leishmania chagasi Associated with Protection against Human Visceral Leishmaniasis

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Quantization rules for bound states in quantum wells

An algebraic reformulation of the Bohr-Sommerfeld (BS) quantization rule is suggested and applied to the study of bound states in one-dimensional quantum wells. The energies obtained with the present quantization rule are compared to those obtained with the usual BS and WKB quantization rules and with the exact solution of the Schrodinger equation. We find that, in diverse cases of physical interest in molecular physics, the present quantization rule not only yields a good approximation to the exact solution of the Schrodinger equation, but yields more precise energies than those obtained with the usual BS and/or WKB quantization rules. Among the examples considered numerically are the Poeschl-Teller potential and several anharmonic oscillator potentials. which simulate molecular vibrational spectra and the problem of an isolated quantum well structure subject to an external electric field.

Soliton parameters and chaotic sets

In this work we apply a nonperturbative approach to analyze soliton bifurcation ill the presence of surface tension, which is a reformulation of standard methods based on the reversibility properties of the system. The hypothesis is non-restrictive and the results can be extended to a much wider variety of systems. The usual idea of tracking intersections of unstable manifolds with some invariant set is again used, but reversibility plays an important role establishing in a geometrical point of view some kind of symmetry which, in a classical way, is unknown or nonexistent. Using a computer program we determine soliton solutions and also their bifurcations ill the space of parameters giving a picture of the chaotic structural distribution to phase and amplitude shift phenomena. (C) 2009 Published by Elsevier Ltd.

Influence of water level variation on biomass and chemical composition of the aquatic macrophyte Eichhornia azurea (Kunth) in an oxbow lake of the Rio Mogi-Guacu (São Paulo, Brazil)

The influence of water level variation (flood pulse) on the biomass and chemical composition of the aquatic macrophyte Eichhornia azurea, was investigated in a tropical oxbow lake of the Rio Mogi-Guacu, State of São Paulo, Brazil. The flood pulse causes an increase in total nitrogen content from 0.67 to 1.35 mg/L and total phosphorus content from 10.5 to 101.0 mu g/L of the water. This fertilization, associated with other factors, determines a typical seasonal variation in the biomass and chemical composition of the macrophyte.