Effective Maxwell's equations in general periodic microstructures

We study the time harmonic Maxwell equations in a meta-material consisting of perfect conductors and void space. The meta-material is assumed to be periodic with period $\eta > 0$; we study the behaviour of solutions $(E^{\eta}, H^{\eta})$ in the limit $\eta \to 0$ and derive an effective system. In geometries with a non-trivial topology, the limit system implies that certain components of the effective fields vanish. We identify the corresponding effective system and can predict, from topological properties of the meta-material, whether or not it permits the propagation of waves

Basis for the Management of Schistocerca cancellata (Orthoptera: Acrididae)

The locust species Schistocerca cancellata Serville, endemic to South America, is known for its ability to form dense swarms, which reach the status of agricultural pest for several crops in southern South America. This article aimed to gather more accurate information about the history, biology, ecology, and control of S. cancellata, because of the 2021 invasions, which threatened to invade the Brazilian territory. During outbreak periods, swarms consume any available vegetation in the occurrence areas of Argentina, Brazil, Paraguay, Uruguay, Chile, and Bolivia. These invasions have been well documented in history, since they left deep marks wherever they went, especially in Argentina, which to this day represents the country that most accounted for agricultural losses from outbreaks. economy’s main current means of control are based on pesticides, whose chemical composition induces a series of damages to health, the environment, and consequently the ecosystem. Knowing about the biological processes of this locust is an important factor in understanding how swarms form, as well as controlling them. The intergovernmental coalition shows positive results in monitoring and controlling the swarms, which, even demonstrating stability, remain under constant surveillance by competent bodies.EEA FamailláFil: Birkhan, Júlia. Universidade Federal de Pelotas. Instituto de Biologia. Departamento de Ecologia, Zoologia e Genética. Laboratório de Ecologia de Insetos; BrasilFil: Carrizo, Beatriz Noemi. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Famaillá; ArgentinaFil: Socias, Guillermina. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Salta; Argentina.Fil: Costa, Maria Kátia Matiotti da. Pontifícia Universidade Católica do Rio Grande do Sul. Faculdade de Biociências. Departamento de Biodiversidade e Ecologia; BrasilFil: Costa, Maria Kátia Matiotti da. Museu de Ciências e Tecnologia (Porto Alegre). Laboratório de Entomologia; BrasilFil: Guedes, Jerson Carus. Universidade Federal de Santa Maria. Centro de Ciências Rurais. Departamento de Defesa Fitossanitária; BrasilFil: Garcia, Flávio Roberto Mello. Universidade Federal de Pelotas. Instituto de Biologia. Departamento de Ecologia, Zoologia e Genética. Laboratório de Ecologia de Insetos; Brasi

Cultura política de la democracia en Perú y en las Américas, 2014 : gobernabilidad democrática a través de 10 años del Barómetro de las Américas

El presente estudio es parte de un programa de investigaciones que el Proyecto de Opinión Pública de América Latina (LAPOP) viene llevando a cabo desde hace más de dos décadas. LAPOP es un consorcio de instituciones académicas y de investigación en las Américas, con sede central en Vanderbilt University, en Estados Unidos. En el proyecto LAPOP participan más de 30 instituciones de toda la región, cuyos esfuerzos tienen el propósito de producir estudios científicos, objetivos e independientes de opinión pública. Dichas investigaciones se enfocan principalmente en la medición de actitudes y comportamientos políticos relacionados con la democracia y la calidad de vida

Male genitalia morphology and dichotomous key of the Neotropical genera of Abracrini (Orthoptera: Acrididae: Ommatolampidinae) grasshoppers

Costa, Maria Kátia Matiotti Da, Carvalho, Gervásio Silva, Zefa, Edison (2022): Male genitalia morphology and dichotomous key of the Neotropical genera of Abracrini (Orthoptera: Acrididae: Ommatolampidinae) grasshoppers. Zootaxa 5159 (3): 383-392, DOI: https://doi.org/10.11646/zootaxa.5159.3.

Análise cladística e biogeográfica dos gêneros do grupo Sitalces (Orthoptera, Acrididae, Abracrini) Cladistic and biogeographic analysis of the genera of the group Sitalces (Orthoptera, Acrididae, Abracrini)

Uma análise cladística do relacionamento entre as espécies sul-americanas do grupo Sitalces (Sitalces Stål, 1878, Eusitalces Bruner, 1911, Parasitalces Bruner, 1911, Psilocirtus Bruner, 1911, Liebermannacris Costa & Carvalho, 2006, Robustusacris Costa & Carvalho, 2006, Arimacris Costa & Carvalho, 2006, Salvadoracris Costa & Carvalho, 2006 e Caruaruacris Costa & Carvalho, 2006) é apresentada. A análise incluiu 14 espécies com três grupos-externos e 34 caracteres morfológicos. A monofilia do grupo é suportada por três sinapomorfias com índices de consistência e retenção de 100%: prozona maior que a metazona, borda posterior do pronoto não angulada e placa supranal mais curta em relação aos cercos. A análise resultou em um único cladograma: (P. olivaceus (E. vittatus (L. dorsualis; L. punctifrons) (R. balzapambae (A. trinitatis (S. nigritus; C. bivittatus) (S. volxemi (P. vulneratus; P. sexnotata)))))). Comentários biogeográficos são apresentados e relacionados com padrões pré-estabelecidos.A cladistic analysis of the relationships among the species of the South American genera of the group Sitalces (Sitalces Stål, 1878, Eusitalces Bruner, 1911, Parasitalces Bruner, 1911, Psilocirtus Bruner, 1911, Liebermannacris Costa & Carvalho, 2006, Robustusacris Costa & Carvalho, 2006, Arimacris Costa & Carvalho, 2006, Salvadoracris Costa & Carvalho, 2006 and Caruaruacris Costa & Carvalho, 2006) is presented. The analysis included 14 species with three outgroups and 34 morphological characters. The monophyly of the group is supported by three sinapomorphies with 100% consistency and retention indices: prozona larger than the metazona, posterior border of the pronotum not angulated and supranal plate shorter than cerci. The analysis resulted in a single cladogram: (P. olivaceus (E. vittatus (L. dorsualis; L. punctifrons) (R. balzapambae (A. trinitatis (S. nigritus; C. bivittatus) (S. volxemi (P. vulneratus; P. sexnotata)))))). Biogeographic comments are presented and related with pre-established standards

Faunistic analyses of grasshoppers (Orthoptera, Acridoidea) in a florest fragment near the Uruguay River, Chapecó, Santa Catarina, Brazil

The objective of the work was to describe the grasshopper community (Orthoptera and Acridoidea) through the analysis of the fauna, in the Lajeado Monte Alegre region, on the bank of the Uruguay River, in the town of Chapecó, Santa Catarina. The collections were carried out on weekly basis, from October 2001 to September 2002, with the use of ground traps, buttnets, insect umbrellas and collections from leaves. The rates of abundance, frequency, constancy, dominance and diversity were measured. In total, 713 acridoids were collected, corresponding to 18 species, 17 genera, and 3 families. From the Acrididae family 13 species were sampled: Abracris flavolienata, Allotruxalis strigata, Amblytropidia sola, Amblytropidia sp., Cylindrotettix chacoensis, Dichroplus misionensis, Eurotettix lilloanus, Metaleptea brevicornis adspersa, Orphulella punctata, Parorphula graminea, Rhammatocerus brunneri, Ronderosia bergi and Schistocerca flavofasciata. From the Romaleidae family, 4 species: Staleochlora viridicata, Chromacris speciosa, Zoniopoda tarsata and Xyleus discoideus. From the Tridactylidae family, 2 unidentified nymphs were collected. The dominant species was A. strigata

FIGURE 17 in Sperberacris, a new Neotropical genus of Gomphocerinae (Orthoptera:Acridoidea Acrididae) from State of Alagoas, Brazil with chromosome complement

FIGURE 17. Map of geographical distribution of Sperberacris muriciensis n. sp. in Brazil.Published as part of Costa, Maria Kátia Matiotti Da, Fernandes, Anelise, Acosta, Riuler Corrêa & Zefa, Edison, 2023, Sperberacris, a new Neotropical genus of Gomphocerinae (Orthoptera:Acridoidea Acrididae) from State of Alagoas, Brazil with chromosome complement, pp. 73-80 in Zootaxa 5228 (1) on page 79, DOI: 10.11646/zootaxa.5228.1.4, http://zenodo.org/record/752410