Hourly Economic Dispatch of Generation Sources Considering the Minimization of Active losses and Generation Costs

The increase of renewable sources in the electricity sector, especially wind and solar photovoltaic, has drawn attention to the need to develop new models for planning and operating the electrical system. In this sense, this paper presents a model for the hourly economic dispatch of electric energy produced by wind, hydraulic, solar, and thermal sources. For the proposed mathematical modeling, the AMPL software was used, and for solution, the Interior Point Method was used, with the Knitro solver. The simulations were carried out in an IEEE 30-bus test system, considering two objective functions, namely: (1) hourly minimization of active power losses and (2) hourly minimization of generation costs. The simulations were carried out for 24 hours a day and for each hour the amount of energy generated, energy losses and generation costs were determined. Constraints related to the power balance, bus voltage levels, transformer tap limits, power factor limits and generation limitations were considered. Regarding the generation data of the wind and solar plants, large plants connected to the Brazilian electrical system were considered. The model presented proved to be efficient in solving the problem presented

Slimmable Encoders for Flexible Split DNNs in Bandwidth and Resource Constrained IoT Systems

The execution of large deep neural networks (DNN) at mobile edge devices requires considerable consumption of critical resources, such as energy, while imposing demands on hardware capabilities. In approaches based on edge computing the execution of the models is offloaded to a compute-capable device positioned at the edge of 5G infrastructures. The main issue of the latter class of approaches is the need to transport information-rich signals over wireless links with limited and time-varying capacity. The recent split computing paradigm attempts to resolve this impasse by distributing the execution of DNN models across the layers of the systems to reduce the amount of data to be transmitted while imposing minimal computing load on mobile devices. In this context, we propose a novel split computing approach based on slimmable ensemble encoders. The key advantage of our design is the ability to adapt computational load and transmitted data size in real-time with minimal overhead and time. This is in contrast with existing approaches, where the same adaptation requires costly context switching and model loading. Moreover, our model outperforms existing solutions in terms of compression efficacy and execution time, especially in the context of weak mobile devices. We present a comprehensive comparison with the most advanced split computing solutions, as well as an experimental evaluation on GPU-less devices

Equilibrium and Disorder-induced behavior in Quantum Light-Matter Systems

We analyze equilibrium properties of coupled-doped cavities described by the Jaynes-Cummings- Hubbard Hamiltonian. In particular, we characterize the entanglement of the system in relation to the insulating-superfluid phase transition. We point out the existence of a crossover inside the superfluid phase of the system when the excitations change from polaritonic to purely photonic. Using an ensemble statistical approach for small systems and stochastic-mean-field theory for large systems we analyze static disorder of the characteristic parameters of the system and explore the ground state induced statistics. We report on a variety of glassy phases deriving from the hybrid statistics of the system. On-site strong disorder induces insulating behavior through two different mechanisms. For disorder in the light-matter detuning, low energy cavities dominate the statistics allowing the excitations to localize and bunch in such cavities. In the case of disorder in the light- matter coupling, sites with strong coupling between light and matter become very significant, which enhances the Mott-like insulating behavior. Inter-site (hopping) disorder induces fluidity and the dominant sites are strongly coupled to each other.Comment: about 10 pages, 12 figure

Emergence of classicality in small number entangled systems

We show the transition from a fully quantized interaction to a semiclassical one in entangled small number quantum systems using the quantum trajectories approach. In particular, we simulate the microwave Ramsey zones used in Rydberg atom interferometry, filling in the gap between the strongly entangling Jaynes Cummings evolution and the semiclassical rotation of the atomic internal states. We also correlate the information flowing with leaking photons to the entanglement generation between cavity field and flying atom and detail the roles played by the strong dissipation and the external driving force in preserving atomic coherence through the interaction.Comment: 4 pages, 6 figure

Cold-Formed Steel Lipped Channel Columns Undergoing Local-Distortional-Global Interaction: Experimental and Numerical Investigation

Experimental and numerical results concerning the post-buckling behavior and strength of fixed-ended cold-formed steel lipped channel columns experiencing interaction involving local, distortional and global buckling (i.e., stemming from the closeness between the critical buckling stresses associated with these three buckling mode types), are reported. After briefly addressing the column specimen geometry selection, the paper presents and discusses the results of an experimental investigation carried out at COPPE, Federal University of Rio de Janeiro (UFRJ, Brazil) and involving 16 columns − its output consists of steel material properties, initial imperfection measurements, equilibrium paths and failure loads/modes. Then, some test results are compared with the values yielded by the corresponding ABAQUS shell finite element simulations. Finally, the paper closes with a brief account of the considerations prompted by the available experimental and numerical ultimate load values, concerning the Direct Strength Method (DSM) design of columns affected by triple (local-distortional-global) mode interaction

COMFORT SEAT MODULE - FIRST CLASS COMFORT FOR ALL

The Comfort Seat Module (CSM) is a project developed in the scope of the EDAM focus area of the MIT – Portugal program, within the Product Design and Development course. The team members involved in the project come from several Engineering backgrounds and includes research students and engineering professionals, from different geographical origins. In this project the team had the purpose of designing and developing a solution, from idea into concept and then onto a valid product that could potentially be produced and even marketed. In parallel, the objective was to train the product development competences and team’s working skills as much as possible, considering the physical distance between the team members.info:eu-repo/semantics/publishedVersio

Obesity, diabetes and OSAS induce of sleep disorders: Exercise as therapy

Sleep is an integral part of good health. Sleep disorders and variations in sleep habits are associated with a low-grade inflammatory status, which may be either a cause or consequence of other conditions, including obesity, diabetes and cardiovascular disease. Several strategies are available to counteract these conditions including continuous positive airway pressure (CPAP), pharmacological and nutritional interventions, and even surgery. At present, our group is investigating the effect of chronic endurance exercise on sleep alterations

Predation on <i>Iguana iguana</i> (Squamata: Iguanidae) by <i>Boa constrictor </i>(Squamata: Boidae) in a fluvial island in the Amazonas river, Brazil, including a list of saurophagy events with Boa constrictor as predator

Predation events known as saurophagy occurs when lizards are involved as prey. Whether by cannibalism or saurophagy such events has been well documented in the last years. This paper report a predation event on Iguana iguana by Boa constrictor recorded in a fluvial island in the Amazonas River, Brazil. Also, provides a list of saurophagy events involving B. constrictor as predator. During a field trip we found an individual of B. constrictor in the process of ingesting a common green iguana (I. iguana), swallowing the headfirst on an upland forest. We found a total of eight lizards as prey of B. constrictor, belonging to three families: Iguanidae, Teiidae and Tropiduridae.Asociación Herpetológica Argentin

Predation on <i>Iguana iguana</i> (Squamata: Iguanidae) by <i>Boa constrictor </i>(Squamata: Boidae) in a fluvial island in the Amazonas river, Brazil, including a list of saurophagy events with Boa constrictor as predator

Predation events known as saurophagy occurs when lizards are involved as prey. Whether by cannibalism or saurophagy such events has been well documented in the last years. This paper report a predation event on Iguana iguana by Boa constrictor recorded in a fluvial island in the Amazonas River, Brazil. Also, provides a list of saurophagy events involving B. constrictor as predator. During a field trip we found an individual of B. constrictor in the process of ingesting a common green iguana (I. iguana), swallowing the headfirst on an upland forest. We found a total of eight lizards as prey of B. constrictor, belonging to three families: Iguanidae, Teiidae and Tropiduridae.Asociación Herpetológica Argentin