Time Horizon and Cooperation in Continuous Time

When subjects interact in continuous time, their ability to cooperate may dramatically increase. In an experiment, we study the impact of different time horizons on cooperation in (quasi) continuous time prisoner's dilemmas. We find that cooperation levels are similar or higher when the horizon is deterministic rather than stochastic. Moreover, a deterministic duration generates different aggregate patterns and individual strategies than a stochastic one. For instance, under a deterministic horizon subjects show high initial cooperation and a strong end-of-period reversal to defection. Moreover, they do not learn to apply backward induction but to postpone defection closer to the end.

Systematics, bionomy, and metamorphosis of Coleoptera (Insecta): Papers celebrating the 80th birthday of Cleide Costa - Foreword from the editors

We present a brief biography of Dr. Cleide Costa, eminent entomologist from Museu de Zoologia da Universidade de São Paulo (MZUSP). She has been dedicating the last six decades to the study of adults and immatures of Coleoptera. Dr. Costa is the pioneer in collecting and rearing immature beetles in Brazil, being responsible for establishing the most extensive Latin American collection of reared immatures Coleoptera. We discuss central aspects of her personal history, as well as career landmarks and achievements. A compilation of taxa introduced to science by her, taxa named in her honor, and a full list of her scientific, educational and cultural production are provided in chronological order. More than a biographical account, this publication is an acknowledgment of Dr. Cleide Costa’s legacy to entomology

Larva of Atractocerus Brasiliensis (Lepeletier & Audinet-Serville, 1825) (Lymexylidae, Atractocerinae)

The larva of Atractocerus brasiliensis (Lepeletier & Audinet-Serville, 1825), collected for the first time in Pinus oocarpa Schiede ex Schltdl. (Pinaceae) is described and illustrated. Until now, for Lymexylidae, only the larva of Melittomma sp. (Melittomminae) was known from the neotropical region (Brazil). Biological notes, a comparison with the description of A. brevicornis, the type-species of the genus (recorded from Africa and Madagascar), and history of the known lymexylid larvae are also included.A larva de Atractocerus brasiliensis (Lepeletier & Audinet-Serville, 1825), coletada pela primeira vez em Pinus oocarpa Schiede ex Schltdl. (Pinaceae) é descrita e ilustrada. Até o momento, em Lymexylidae, apenas a larva de Melittomma sp. (Melittomminae) era conhecida do Brasil. Notas biológicas, uma comparação com a descrição de A. brevicornis, a espécie-tipo do gênero (da África e Madagascar) e o histórico das larvas de limexilídeo conhecidas também estão incluídos

First instar larva of Atractocerus brasiliensis (Lepeletier & Audinet-Serville, 1825) (Lymexylidae, Atractocerinae)

A larva de primeiro instar de Atractocerus brasiliensis (Lepetelier & Audinet-Serville, 1825) do estado de Goiás, Brasil, e criada em laboratório, é descrita e ilustrada. Esta é a segunda espécie com larva de primeiro instar conhecida para o gênero e a terceira para a família. Comparações com a larva madura dessa espécie e com as demais larvas de primeiro instar conhecidas são apresentadas. Ilustrações das larvas de primeiro instar e madura também são incluídas.The first instar larva of Atractocerus brasiliensis (Lepetelier & Audinet-Serville, 1825) from state of Goiás, Brazil, and reared in laboratory, is described and illustrated. This is the second species with known first instar larva for the genus and the third for the family. Comparisons with mature larva of this species and with the other known first instar larvae are presented. Illustrations of first instar and mature larvae are also included

Morphology of the adult and immatures of a striking new species of leaf-mining Brachys Dejean from Brazil (Buprestidae, Agrilinae)

Adult and immature stages of a new species, Brachys cleidecostae sp. nov., are described and illustrated. This species represents the first leaf-mining buprestid with two broad, prominent horn-like apophyses on vertex, resembling broad horns. The material was collected within unusual shaped leaf mines in Alibertia sessilis (Vell.) K. Schum (Rubiaceae), a native species from Brazilian Savanna (Cerrado). This is the first record of Brachys associated with a host plant of family Rubiaceae

Structured mesh generation and numerical analysis of a scroll expander in an open-source environment

The spread of the organic rankine cycle applications has driven researchers and companies to focus on the improvement of their performance. In small to medium-sized plants, cyanthe expander is the component that has typically attracted the most attention. One of the most used types of machine in this scenario is the scroll. Among the other methods, numerical analyses have been increasingly exploited for the investigation of the machine's behaviour. Nonetheless, there are major challenges for the successful application of computational fluid dynamics cyan(CFD) to scrolls. Specifically, the dynamic mesh treatment required to capture the movement of working chambers and the nature of the expanding fluids require special care. In this work, a mesh generator for scroll machines is presented. Given few inputs, the software described provides the mesh and the nodal positions required for the evolution of the motion in a predefined mesh motion approach. The mesh generator is developed ad hoc for the coupling with the open-source CFD suite OpenFOAM. A full analysis is then carried out on a reverse-engineered commercial machine, including the refrigerant properties calculations via CoolProp. It is demonstrated that the proposed methodology allows for a fast simulation and achieves a good agreement with respect to former analyses

Not So Fun City

This article posits that the destruction of the South Bronx during the 1960s and 1970s was municipally approved across several mayoral administrations, most notably the term of John Lindsay who coined the catch phrase “Fun City,” referring to New York City on the first day of a transit strike. The author outlines several books and articles that detail the destruction caused by fires and city planning decisions that adversely affected White ethnic and neighborhoods of color in the South Bronx. Media portrayals during this period were used to stereotype certain areas of the Bronx which in turn allowed city planners to advocate for their destruction. During this period there was a massive out-migration of Bronxites adding to the urban swirl. In the end the people who live in these maligned areas are ultimately blamed for the destruction of their neighborhoods even though the City of New York and its consultants made decisions that allowed it to happen. The role of the RAND corporation and Fire Commissioner John O’Hagan figure prominently in this narrative

Concourse Dreams: A Bronx Neighborhood And Its Future

This master\u27s thesis focuses on the West Bronx recent past and illustrates what upward mobility meant for the Grand Concourse neighborhood populated with second generation immigrant groups at the beginning of the 20th century, including Jewish, Italian and Irish people. Later, most of the same area became a slum at the hands of city planners, New York City administration, and negative media portrayals. Race and ethnicity became even more talked about when non-white immigrants and migrants began moving to the Grand Concourse in huge numbers after World War Two.Through a celebrated Bronx past before 1950 and eventually the sensational media portrayals of the 1970s, the best residential and civic architecture in America stood sentry over the Grand Concourse. This thesis will also illustrate the remarkable changes and investments being made in the Bronx during the current decade as exemplified by the new Yankee Stadium and Bronx Terminal Market. The future of this neighborhood is also discussed by four informed and involved community residents

Full 3D numerical analysis of a twin screw compressor by employing open-source software

The push for having more reliable and efficient positive displacement machines (both compressors and expanders) for vapor compression and power generation (e.g., ORCs) applications has moved researchers to an always more spread employment of computational fluid dynamics (CFD). In particular, twin screw compressors, because of their high efficiency compared to other compressor types, have received interest over the last years. The numerical analysis of such machines is challenging: the deforming working chambers are very difficult to be correctly replicated. The relative motion of the rotors and the variation of the gaps during machine operation are few of the major difficulties in implementing reliable CFD models. A custom mesh generation algorithm is therefore often required for sumulating the machine operation. In this work, SCORG-V5.2.2 was used to generate the meshes of the deforming domain around rotating parts of the machines. The open-source software OpenFOAM-v1606+ is then employed to compute the flow field associated with the operation of the twin screw. The coupling of the two tools has been carried out in this work, applying the methodology to a twin screw machine