The Low Energy Limit of the Chern-Simons Theory Coupled to Fermions

We study the nonrelativistic limit of the theory of a quantum Chern--Simons field minimally coupled to Dirac fermions. To get the nonrelativistic effective Lagrangian one has to incorporate vacuum polarization and anomalous magnetic moment effects. Besides that, an unsuspected quartic fermionic interaction may also be induced. As a by product, the method we use to calculate loop diagrams, separating low and high loop momenta contributions, allows to identify how a quantum nonrelativistic theory nests in a relativistic one.Comment: 18 pages, 8 figures, Late

DBT-5: An Open-Source TPC-E Implementation for Global Performance Measurement of Computer Systems

TPC-E is the new benchmark approved by the TPC council. It is designed to exercise a brokerage firm workload, which is representative of current On-Line Transaction Processing workloads. In this paper we present DBT-5, a fair usage open-source implementation of the TPC-E benchmark. In addition to reporting about the design and implementation of the tool, experimental results from a system running database engine are also described. The significance of this work is that it provides an environment where recent innovations in the OLTP workload field can be evaluated

Social wasps are effective biocontrol agents of key lepidopteran crop pests

Biocontrol agents can help reduce pest populations as part of an integrated pest management scheme, with minimal environmental consequences. However, biocontrol agents are often non-native species and require significant infrastructure; overuse of single agents results in pest resistance. Native biocontrol agents are urgently required for more sustainable multi-faceted approaches to pest management. Social wasps are natural predators of lepidopteran pests, yet their viability as native biocontrol agents is largely unknown. Here, we provide evidence that the social paper wasp Polistes satan is a successful predator on the larvae of two economically important and resilient crop pests, the sugarcane borer Diatraea saccharalis (on sugarcane Saccharum spp.) and the fall armyworm Spodoptera frugiperda (on maize Zea mays); P. satan wasps significantly reduce crop pest damage. These results provide the much-needed baseline experimental evidence that social wasps have untapped potential as native biocontrol agents for sustainable crop production and food security

On the finiteness of the noncommutative supersymmetric Maxwell-Chern-Simons theory

Within the superfield approach, we prove the absence of UV/IR mixing in the three-dimensional noncommutative supersymmetric Maxwell-Chern-Simons theory at any loop order and demonstrate its finiteness in one, three and higher loop orders.Comment: 9 pages, 2 figures, revtex

Comportamento fisiológico de sementes de açaí (Euterpe oleracea Mart.) submetidas à desidratação.

O presente trabalho, objetivando verificar os efeitos imediatos da desidratação sobre o comportamento fisiológico das sementes de açaí (Euterpe oleracea Mart.), utilizou lote oriundo de população de 25 progênies de meio-irmãos, pertencente à Coleção de Germoplasma da Embrapa Amazônia Oriental (Belém/PA). Anteriormente à secagem, foi determinado o grau de umidade das sementes e coletado o tratamento que continha o maior grau de umidade (45%). As demais sementes foram submetidas à secagem, em câmara com circulação de ar (30°C±2°C), visando à obtenção dos demais tratamentos com 39%, 33%, 27%, 22% e 15% de água. O efeito da desidratação sobre a qualidade das sementes foi avaliado através das seguintes determinações: grau de umidade, teste de germinação, índice de velocidade de emergência e emergência de plântulas. Foi verificado que desidratação até 39% de água não produz efeitos fisiológicos imediatos sobre as sementes de açaí; a partir de 33% de água, a dessecação favorece progressivamente a redução da germinação e, ao atingir 15% de água, a capacidade germinativa foi anulada.Trabalho também apresentado no 18º Congresso Brasileiro de Fruticultura, 2004, em Florianópolis