Instability and new phases of higher-dimensional rotating black holes

It has been conjectured that higher-dimensional rotating black holes become unstable at a sufficiently large value of the rotation, and that new black holes with pinched horizons appear at the threshold of the instability. We search numerically, and find, the stationary axisymmetric perturbations of Myers-Perry black holes with a single spin that mark the onset of the instability and the appearance of the new black hole phases. We also find new ultraspinning Gregory-Laflamme instabilities of rotating black strings and branes.Comment: 5 pages, 5 figures. The instability of the black hole is argued to appear at the second zero mode. The first zero mode is not associated to a new branch of black hole solution

On the derivation of class diagrams from use cases and logical software architectures

The transformation of user requirements into system requirements models can be achieved using the 4-Step Rule Set (4SRS) method that transforms UML use case diagrams into system-level object diagrams. These diagrams represent the logical architecture of the system, integrating the system-level entities, their responsibilities and the relationships among them. The logical architecture captures the system functional requirements and its nonfunctional intentionalities. Although contributing to the formalization of the design of software architectures, the 4SRS method needs to be extended in order to support the design of the database subsystems that may be considered pertinent within the specified logical architecture. This paper presents the extension of the 4SRS method to support the construction of the class diagram that complements the logical architecture, and shows, through the presentation of a demonstration case, the applicability of the proposed approach.(undefined

Sustainable Supply Chain in the Era of Industry 4.0 and Big Data: A Systematic Analysis of Literature and Research

Supply chain sustainability (SCS) in the age of Industry 4.0 and Big Data is a growing area of research. However, there are no systematic and extensive studies that classify the different types of research and examine the general trends in this area of research. This paper reviews the literature on sustainability, Big Data, Industry 4.0 and supply chain management published since 2009 and provides a thorough insight into the field by using bibliometric and network analysis techniques. A total of 87 articles published in the past 10 years were evaluated and the top contributing authors, countries, and key research topics were identified. Furthermore, the most influential works based on citations and PageRank were obtained and compared. Finally, six research categories were proposed in which scholars could be encouraged to expand Big Data and Industry 4.0 research on SCS. This paper contributes to the literature on SCS in the age of Industry 4.0 by discussing the challenges facing current research but also, more importantly, by identifying and proposing these six research categories and future research directions

A UML-based approach for modeling industrial control applications

The main purpose of the poster is to present how the Unified Modeling Language (UML) can be used for diagnosing and optimizing real industrial production systems. By using a car radios production line as a case study, the poster shows the modeling process that can be followed during the analysis phase of complex control applications. In order to guarantee the continuity mapping of the models, the authors propose some guidelines to transform the use cases diagrams into a single object diagram, which is the main diagram for the next phases of the development.This work has been partially funded by the Portuguese Science & Technology Foundation project PRAXIS/P/EEI/10155/1998, Recon gurable Embedded Systems: Development Methodologies for Real-Time Application

From business process modeling to data model : a systematic approach

Business process modeling and management approaches are increasingly used and disclosed between organizations as a means of optimizing and streamlining the business activities. Among the various existing modeling languages, we stress the Business Process Model and Notation (BPMN), currently in version 2.0. BPMN is a widespread OMG standard that is actually used either in academia and in organizations. BPMN enables business process modeling, but does not facilitate the modeling of the information infrastructure involved in the process. However, interest in the data and its preservation has increased in BPMN’s most recent version. The aim of this paper is to study BPMN 2.0, particularly on the usage and persistence of data, and present an approach for obtaining an early data model from the business process modeling, which may then be used as a starting data model in the software development process

Deriving software design models from a set of business processes

Requirements elicitation is a crucial activity and one of the first steps in software development process. A popular way to capture and describe requirements is through UML use case models. Transforming require- ment specifications into software design models is a complex and error prone software development activity. Software design usually involves several models, each one representing a different perspective. One of those perspectives is the data perspective which can be modeled using a data model. Although of the importance of this model, few works has been done to derive a data model from use case model. The 4SRS (4-Step Rule Set) method generates a logical architecture of a software-based system, based on a use case model. This paper proposes an approach to adapt and extend the 4SRS method in order to generate a data model supporting the generated logical architecture and the elicited requirements based in a set of business process models.This work has been supported by FCT - Fudação para a Ciência e Tecnologia in the scope of the project: PEst-UID/CEC/00319/201

Flutuações diárias na associação de peixes da praia de areia de Porto Pim, ilha de Faial, Açores

Os peixes da praia de areia de Porto Pim, Açores foram amostrados através de arrastos de rede (chinchorro) a intervalos de três horas durante um período de 24 horas nos meses de Agosto, Setembro e Outubro de 1989. A associação de peixes era dominada, em cada um dos meses, por três a quatro espécies (90-97% dos indivíduos). A maioria das espécies estavam representadas por formas juvenis. A variação entre meses do padrão diário pode explicar-se primariamente pelas mudanças no padrão de abundância das espécies dominantes. Ao longo dos três meses as variações na estrutura da associação implicaram mudanças no padrão diário. Muitas das espécies tinham um padrão de abundância definido, primariamente por ser ou diurno ou nocturno. Encontrou-se também um padrão de maré na estrutura da associação de peixes caracterizado por uma maior diversidade na maré baixa.ABSTRACT: The shallow-water fish assemblage at Porto Pim, Azores was sampled with a beach seine at three hour intervals over 24 h periods in August, September and October 1989. The fish assemblage was dominated by three to four species in each month (90-97% of numbers). Most species were present as juveniles. The variation in diel patterns between months could primarily be explained by changes in the pattern of abundance of dominant species. Over the three months seasonal changes in the assemblage structure caused changes in the diel pattern. Many of the species present had a definite pattern to their abundance being either primarily diurnal or nocturnal. There was also a tidal pattern to the assemblage structure which had a higher diversity at low water

Associações de peixes das zonas entre-marés da ilha do Faial, Açores

No presente artigo descrevemos as associações de peixes das poças do intertidal rochoso e do intertidal arenoso dos Açores. São treze as espécies que ocorrem nas poças do intertidal rochoso. Os blenídeos, com Parablennius sanguinolentus parvicornis, Coryphoblennius galerita e Lipophrys trigloides, constituem a família dominante de peixes residentes das poças do intertidal rochoso. A riqueza é maior no 3º trimestre, com 12 espécies, e menor no 1º trimestre com apenas oito espécies a ocorrerem nas poças. A diversidade é também superior no 3º trimestre. O pequeno grau de variação pode ser fundamentalmente atribuído à presença de espécies transientes e de juvenis que utilizam a costa durante as primeiras fases de desenvolvimento. São quinze as espécies que ocorrem na zona intertidal da praia arenosa de Porto Pim. A comunidade de peixes é aqui dominada por juvenis de espécies transientes. Não encontrámos espécies intertidais residentes. A riqueza e abundância são superiores no 3º e 4º trimestre devido ao recrutamento de juvenis, e à ocorrência de espécies migradoras e transientes.ABSTRACT: In the present paper we describe fish assemblages of rocky intertidal pools and intertidal areas of sandy beaches of the Azores. Blennies (Parablennius sanguinolentus parvicornis, Coryphoblennius galerita and Lipophrys trigloides) constitute the dominant resident fish family in the intertidal pools. Thirteen species were encountered in intertidal pools. Richness is higher in the 3rd quarter of the year with 12 species and lower in the 1st and 2nd quarters with 8 species occurring in the samples . Diversity is also higher in the 3rd quarter The small variation can mostly be attributed to transient species and juveniles using the shore as a nursery ground. Fifteen species occurred in the intertidal region of the protected shallow sandy beach of Porto Pim. This fish assemblage was dominated by juveniles of transient species. No resident species were present here. Richness and abundance were higher in 3rd and 4th quarters due to recruitment of juveniles, and the occurrence of migrant and transient species

A methodology for complex embedded systems design : Petri nets within a UML approach

This paper focus mainly on the analysis phase, describing a UML-based approach for designing complex embedded systems, and specifically the usefulness of using shobi-PN v2.0 specifications, a Petri net extension, for modelling the dynamic behaviour. A relative complex case study is used to show the usefulness of the suggested specification approach