1,721,013 research outputs found
Virtual society of IoT Robosats and emancipation of electrical utilization
No full textIoT can offer to each person monitored automata, robosats (robot satellites), as extension of the personal domain of action. These robosats can establish a virtual society of things in a connected dynamic system that is constitute 'virtual' structures of microsystem chains of many megawatts. Considering that the average use of household electricity reaches more than 20% of total energy consumes, the prospective influence of IoT on the electrical energy utilization can start an epochal evolution in the structure/operation of power systems. IoT can permit an efficient establishment of electrical microgrids and the pursuit of sustainability objectives. At this aim it is necessary a new approach and adequate regulatory changes
Integrated grounding systems: an unavoidable opportunity for users in urban and industrial areas
No full textIn the IEC approach, a global ground system by definition ensures the safety of interconnected MV / LV ground facilities, but the utility only can validate its existence. An integration between adjacent ground systems of users, such as in urban and industrial areas, assists to ensure that the safety conditions prescribed by the standards are met regardless of requiring recognition from the utility. This solution can contribute to promote the upgrade to the global ground system with the final adhesion of the utilities overcoming the problem of validating the global ground system and promoting the common interest of safety
"Energy castles" equalized to strategic structures for disaster recovery in emergency
No full textRural and marginal areas with a low density of buildings and facilities have generally an easily vulnerable service continuity. The earthquake of central Italy in the beginning of 20017 has claimed the need to construct structures equalized to strategic (SES) in emergency, such as schools, churches, hotels and residential sites. These buildings have to play the role of fortified structures and haven for the local community in vulnerable areas, similarly to the historical castles in Europe or the historical forts in USA. This paper highlights the need of organizing a disaster recovery plan (DRP) and a disaster recovery grid (DRG) for these vulnerable areas to build a structure with criteria adequate to the energetic performance in emergency exceeding the normal functions and it presents a case study of a school qualified as SES
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Utilization of Regenerative Energy by Ultracapacitor Sizing for Peak Shaving in STS Crane
No full textThis paper presents a strategy to avoid peak demand rising and energy management due to existing cranes at container terminals (CT). The new generation of the Ship to Shore (STS) cranes installed at the port of Long Beach (POLB) are equipped with the capabilities to absorb up to 90% of the regenerative energy (RE). Hence, a percent of RE is fed into the dc-bus in an STS Crane and deliver to the Ultracapacitor (UC) bank energy storage system (ESS). As an effective method, UC sizing is able to do the local peak shaving in each STS Crane and then with the remaining percent of the RE by the duty cycle coordination for the STS group Cranes the overall peak power minimization in point of delivery has been reviewed based on PSO algorithm. Results in MATLAB shows the two proposed methods can reduce the peak power demand and increase the percentage of the utilization energy factor (UEF) in STS cranes
A life loss tool for an optimal management in the operation of insulated power cables
No full textAn optimized system management of a power system must take care of the actual operational and energetic duty of the power system distribution, promoting a high efficiency of power cables and avoiding their excessive gap on load and gap on lifetime. A procedure based on the Arrhenius model of the Thermal Aging of Insulating Materials allows implementing a tool to calculate the life loss and the residual useful life for insulated power cables. The paper deals with simplified models to evaluate the power cable temperature behavior considering the load current variable in the time. The life loss analysis can be performed both “off-line”, based on the available circuit parameters and measurements, or “on-line” by appropriate control systems. Furthermore, the paper proposes a specific device to count the “life loss hours”. The employment of such tools supports the system operators to monitor the cables life loss in the effective installation conditions, to optimize their operation and maintenance and, possibly, to upgrade the efficiency of the distribution system
A technical first level for accident trials. How to make expert testimony truly count in court
No full textThis article deals with the known contrast between what might be called the certain logic required by judicial proceedings and the uncertain logic of engineering evaluation. For accident cases that require a risk assessment, this study offers a solution to adopt a division of accident-related trials into two different levels: 1) an engineering level, in which a technical analysis of the accident’s causes is performed, followed by 2) the traditional judicial level. A technical level might better support the formulation of a rational verdict by providing a more exhaustive analysis of an accident’s causation and the parties’ responsibilities. It might also provide criteria to improve safety and prevent accidents in the workplace and in the operation of electrical installations
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