Isospin Constraints on the Parametric Coupling Model for Nuclear Matter

We make use of isospin constraints to study the parametric coupling model and the properties of asymmetric nuclear matter. Besides the usual constraints for nuclear matter - effective nucleon mass and the incompressibility at saturation density - and the neutron star constraints - maximum mass and radius - we have studied the properties related with the symmetry energy. These properties have constrained to a small range the parameters of the model. We have applied our results to study the thermodynamic instabilities in the liquid-gas phase transition as well as the neutron star configurations.Comment: 11 pages, 10 figure

TORGA.net: the trans Portugal-Galicia communication network

The Trans Portugal Galicia Network Project, TORGA.net, was a proposal to the Program Interregional IIIA, Galicia – North of Portugal sub-program with the following partners: University of Minho, University of Vigo, Centro de Supercomputación de Galicia and the Centro de Computação Gráfica in Guimarães. It has as its main objective the creation of infrastructures and the organization and development of the space beyond borders. The project proposes to establish a broadband communication network with reduced operational costs that links the campuses of the Universities of Vigo and Minho, as well as their associated Technological Centers, which are the Supercomputación de Galicia and the Centro de Computação Gráfica in Guimarães. Using this telecommunications infrastructure, Access Centers will be installed in a Technology Access Grid, which will allow distance work sessions such as seminars, lessons, or discussion meetings.Momentan arbeiten die Bildungs-, Forschungs- und Entwicklungs- Einrichtungen von Galicien und dem Norden von Portugal nur gelegentlich und auf einzelne Projekte beschränkt zusammen, obwohl sich längst herausgestellt hat, welche Synergien aus dieser Kooperation entstehen. Auf Grund dessen sieht das Torga.net Projekt die Implementierung einer Breitband- Kommunikations-Infrastruktur vor. Diese wird die Problematik, die durch die geringe Zusammenarbeit beider Regionen entsteht, reduzieren und den Zugang und das Teilen von Wissen erleichtern. Aufbauend auf dieser Kommunikationsplattform sind Lösungen der kooperativen Arbeit vorgesehen. Videokonferenzen und E-Learning dienen dabei als Unterstützung für dieb Zusammenarbeit zwischen den Institutionen beiderseits der Grenzen.União Europeia (UE) - Interregional IIIA, Galicia – North of Portugal Program - Direcção-Geral do Desenvolvimento Regional Secretaria de Estado de Presupuestos y Gastos

Biodiversidade de sirfídeos em olivais da região de Mirandela (Nordeste de Portugal)

As larvas de sirfídeo têm potencial como agentes de luta biológica e no olival podem ser particularmente importantes como predadores naturais de algodão-daoliveira, Euphyllura olivina Costa (Hemiptera: Psyllidae) e de larvas da geração filófaga da traça-da-oliveira, Prays oleae Bernard (Lepidoptera: Yponomeutidae). Com o presente trabalho pretendeu-se conhecer a diversidade da sirfideofauna em olivais na zona de Mirandela (Trás-os-Montes). O trabalho de campo foi realizado em duas parcelas de um olival conduzido em Modo de Produção Biológico (Valbom-dos-Figos) e em três olivais conduzidos em Modo de Produção Integrada (Cedães, Paradela e Suçães). A amostragem decorreu de agosto a outubro de 2009, de abril a novembro de 2010 e de maio a novembro de 2011. Os sirfídeos foram recolhidos com recurso a: (1) garrafas Olipe, (2) rede entomológica e (3) armadilhas cromotrópicas amarelas. Todos os sirfídeos recolhidos foram levados para o laboratório, separados, conservados em álcool e identificados até à espécie. A riqueza específica para os sirfídeos capturados nas garrafas Olipe variou entre uma a três espécies em 2011, três e cinco em 2010 e quatro em 2009. A espécie mais abundante para os três anos de amostragem e neste tipo de armadilha foi Episyrphus balteatus (De Geer), com uma abundância relativa que variou entre 36,4 e 64,62%. Através da rede entomológica foi possível capturar quatro espécies, sendo Sphaerophoria scripta (L.) a espécie dominante com 72,7% de abundância relativa. As armadilhas cromotrópicas capturaram um número muito baixo de sirfídeos, mas uma das espécies capturadas foi única neste estudo, Myathropa florea (L.). Neste estudo foi possível registar um total de nove espécies pertencentes à sirfideofauna no olival transmontano

Syrphid community in organic olive groves: can morphospecies be used as surrogates for species?

Syrphids are known as biological control agents of hemipteran pests and, in the olive grove, several species have been identified as predators of Euphyllura olivina (Costa). The objectives of this work were: (1) to study the syrphid community in organic olive groves and (2) to test the potential for the use of syrphid morphospecies as a surrogate for species. The field work was conducted in two organic olive groves located near Mirandela (Northeast of Portugal). The sampling period occurred in two seasons, from the middle of August to the end of October 2009 and from the beginning of April to the end of July 2010. Syrphids adults were separated in morphospecies by a parataxonomist in accordance with their morphological differences. Then, the species were identified by a taxonomist. The number of individuals collected was 64 in 2009 and 27 in 2010, for a total of 91. The morphological identification showed the presence of 12 morphospecies that corresponded to six species: Episyrphus balteatus (De Geer) the most abundant with 51.7% of relative abundance, followed by Sphaerophoria scripta (L.) with 23.1% and Eupeodes corolla (Fabricius) with 18.6%. The proportion of correctly assigned morphospecies to taxonomic species was 3.3%. However, during the identification, a 93.4% splitting and a 3.3% lumping error occurred. This study showed that species identification was relatively difficult when based only on parataxonomic traits, requiring a careful examination of characteristics such as the size of the eyes and their hair, the form of the antennae, the humeral plate and the squama, as well as the femur color and the size of the bands on the abdomen

Measuring the Energy Efficiency of Evaporative Systems through a New Index - EvaCOP

Evaporative systems are probably the oldest technology for thermal comfort. However, they are still an essential technology in the food industry, environments for thermal comfort, and even for cooling data centers. Standards have been improved to compare the energy efficiency of this type of equipment. Using AHRI concepts with temperature data from the 29 most populous cities in the world, an EvaCOP index was created from temperatures that are easier to simulate than current parameters. The index parameters were tested in a laboratory located in Curitiba (Brazil). EvaCOP values of 45.58 and 25.77 W/W were found in the calculation in two different simulated equipment and compared with the compression cycle systems that in the most efficient machines is around 6.29 W/W.info:eu-repo/semantics/publishedVersio

Ecoenergetic Comparison of HVAC Systems in Data Centers

The topic of sustainability is of high importance today. Global efforts such as the Montreal Protocol (1987) and the Kigali Amendment (2016) are examples of joint work by countries to reduce environmental impacts and improve the level of the ozone layer, the choice of refrigerants and air conditioning systems, which is essential for this purpose. But what indicators are to be used to measure something so necessary? In this article, the types of air conditioning and GWP (Global Warming Potential) levels of equipment in the project phase were discussed, the issue of TEWI (Total Equivalent Warming Impact) that measures the direct and indirect environmental impacts of refrigeration equipment and air conditioning and a new methodology for the indicator was developed, the TEWI DC (DC is the direct application for Data Center), and using the formulas of this new adapted indicator it was demonstrated that the TEWI DC for Chicago (USA) was 2,784,102,640 kg CO2/10 years and Curitiba (Brazil) is 1,252,409,640 kg CO2/10 years. This difference in value corresponds to 222.30% higher annual emissions in Chicago than in Curitiba, showing that it is much more advantageous to install a Data Center in Curitiba than in Chicago in terms of environmental impact. The TEWI indicator provides a more holistic view, helping to combine energy and emissions into the same indicator.info:eu-repo/semantics/publishedVersio

Evaluation of the heat and energy performance of a datacenter by a new efficiency index: Energy Usage Effectiveness Design - EUED

Data Centers are growing steadily worldwide and they are expected to continue on growing up to 53% in 2020. Due to this growth the energy efficiency in this type of building is essential. There are methodologies to measure this efficiency; one example is PUE (Power Usage Effectiveness). The unit suggested for measuring efficiency at the design stage would be the EUED (Energy Usage Efficiency Design) with this will be used data to use "free cooling" and adiabatic system in some cases, a comparison will be made only considering the equipment in the worst situation. It also uses the study of enthalpy utilization as a new methodology to obtain the results. By doing so, differences were found, between cities than 1.21% of São Paulo in relation to Curitiba and 10.61% of Rio de Janeiro in relation to Curitiba. The indices obtained by applying the EUED index were 1.245 kW.kW- 1 for Curitiba, 1.260 kW.kW-1 for São Paulo and 1.377 kW.kW-1 for Rio de Janeiro, respectively, giving a difference of 16.86% for Curitiba of 16.19% for São Paulo and 10.31% for Rio de Janeiro in relation to PUE COA (Power Usage Effectiveness Constant Outdoor Air).info:eu-repo/semantics/publishedVersio

Refrigeration of COVID-19 Vaccines: Ideal Storage Characteristics, Energy Efficiency and Environmental Impacts of Various Vaccine Options

This article considers the ideal storage conditions for multiple vaccine brands, such as Pfizer, Moderna, CoronaVac, Oxford–AstraZeneca, Janssen COVID-19 and Sputnik V. Refrigerant fluid options for each storage condition, thermal load to cool each type of vaccine and environmental impacts of refrigerants are compared. An energy simulation using the EUED (energy usage effectiveness design) index was developed. The Oxford–AstraZeneca, Janssen COVID-19 and CoronaVac vaccines show 9.34-times higher energy efficiency than Pfizer. In addition, a TEWI (total equivalent warming impact) simulation was developed that prioritizes direct environmental impacts and indirect in refrigeration. From this analysis, it is concluded that the cold storage of Oxford–AstraZeneca, Janssen COVID-19 and CoronaVac vaccines in Brazil generates 35-times less environmental impact than the Pfizer vaccine.info:eu-repo/semantics/publishedVersio

Evaluation of the Thermal Performance and Energy Efficiency of CRAC Equipment through Mathematical Modeling Using a New Index COP WEUED

As the world data traffic increasingly grows, the need for computer room air conditioning (CRAC)-type equipment grows proportionally. The air conditioning equipment is responsible for approximately 38% of the energy consumption of data centers. The energy efficiency of these pieces of equipment is compared according to the Energy Standard ASHRAE 90.1-2019, using the index Net Sensible Coefficient Of Performance (NetSCOP). This method benefits fixed-speed compressor equipment with a constant inlet temperature air-cooled condenser (35 C). A new method, COP WEUED (COP–world energy usage effectiveness design), is proposed based on the IPLV (integrated part load value) methodology. The IPLV is an index focused on partial thermal loads and outdoor temperature data variation for air intake in the condenser. It is based on the average temperatures of the USA’s 29 major cities. The new method is based on the 29 largest cities worldwide and with datacenter- specific indoor temperature conditions. For the same inverter compressor, efficiencies of 4.03 and 4.92 kW/kW were obtained, using ASHRAE 90.1-2019 and the proposed method, respectively. This difference of almost 20% between methods is justified because, during less than 5% of the annual hours, the inlet air temperature in the condenser is close to the NetSCOP indication.Authors acknowledge Fundação para a Ciência e a Tecnologia (FCT—MCTES) for its financial support via the project UIDB/00151/2020 (C-MAST).info:eu-repo/semantics/publishedVersio