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Energies, Volume 12, Issue 7

April-1 2019 - 224 articles

Cover Story: Optimizing the reactant gas supply and product water removal in hydrogen fuel cells leads to higher performance and efficiency. This work investigates the interaction between water and gas in a fuel cell using porous metal foam as a flow-field in a numerical and ex-situ study, demonstrating the importance of surface tension, the contact angle and pore size. View this paper.
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Articles (224)

  • Article
  • Open Access
12 Citations
5,323 Views
15 Pages

3D Imaging of Geothermal Faults from a Vertical DAS Fiber at Brady Hot Spring, NV USA

  • Whitney Trainor-Guitton,
  • Antoine Guitton,
  • Samir Jreij,
  • Hayden Powers and
  • Bane Sullivan

11 April 2019

In March 2016, arguably the most ambitious 4D (3D space + over time) active-source seismic survey for geothermal exploration in the U.S. was acquired at Brady Natural Laboratory, outside Fernley, Nevada. The four-week experiment included 191 vibrosei...

  • Article
  • Open Access
11 Citations
4,724 Views
20 Pages

Implementation of User Cuts and Linear Sensitivity Factors to Improve the Computational Performance of the Security-Constrained Unit Commitment Problem

  • Cristian Camilo Marín-Cano,
  • Juan Esteban Sierra-Aguilar,
  • Jesús M. López-Lezama,
  • Álvaro Jaramillo-Duque and
  • Walter M. Villa-Acevedo

11 April 2019

Power system operators must schedule the available generation resources required to achieve an economical, reliable, and secure energy production in power systems. This is usually achieved by solving a security-constrained unit commitment (SCUC) prob...

  • Article
  • Open Access
40 Citations
5,005 Views
19 Pages

Multi-Agent-Based Data-Driven Distributed Adaptive Cooperative Control in Urban Traffic Signal Timing

  • Haibo Zhang,
  • Xiaoming Liu,
  • Honghai Ji,
  • Zhongsheng Hou and
  • Lingling Fan

11 April 2019

Data-driven intelligent transportation systems (D2ITSs) have drawn significant attention lately. This work investigates a novel multi-agent-based data-driven distributed adaptive cooperative control (MA-DD-DACC) method for multi-direction queuing str...

  • Article
  • Open Access
2 Citations
4,698 Views
20 Pages

A Loss-Free Resistor-Based Versatile Ballast for Discharge Lamps

  • Hugo Valderrama-Blavi,
  • Antonio Leon-Masich,
  • Carlos Olalla and
  • Àngel Cid-Pastor

11 April 2019

This paper presents a versatile ballast for discharge lamps, whose operation is based on the notion of a loss-free resistor (LFR). The ballast consists of two stages: (1) a boost converter operating in continuous conduction mode (CCM) and exhibiting...

  • Article
  • Open Access
1 Citations
3,478 Views
21 Pages

Shales Leaching Modelling for Prediction of Flowback Fluid Composition

  • Andrzej Rogala,
  • Karolina Kucharska and
  • Jan Hupka

11 April 2019

The object of the paper is the prediction of flowback fluid composition at a laboratory scale, for which a new approach is described. The authors define leaching as a flowback fluid generation related to the shale processing. In the first step shale...

  • Article
  • Open Access
7 Citations
3,468 Views
13 Pages

11 April 2019

Contactless capacitive (open-air) sensors are applied to monitor overvoltages near overhead line terminations at a substation or at the transition from underground cables to overhead lines. It is shown that these sensors, applied in a differentiating...

  • Article
  • Open Access
12 Citations
4,660 Views
22 Pages

11 April 2019

Enhanced heat transfer surfaces allow more energy-efficient, compact and lightweight heat exchangers. Within this study, a method for comparing different types of enhancement and different geometries with multiple objectives is developed in order to...

  • Article
  • Open Access
45 Citations
6,873 Views
18 Pages

LCA-Based Comparison of Two Organic Fraction Municipal Solid Waste Collection Systems in Historical Centres in Spain

  • Jara Laso,
  • Isabel García-Herrero,
  • María Margallo,
  • Alba Bala,
  • Pere Fullana-i-Palmer,
  • Angel Irabien and
  • Rubén Aldaco

11 April 2019

Municipal solid waste (MSW) collection is an important issue in the development and management of smart cities, having a significant influence on environmental sustainability. Door-to-door and pneumatic collection are two systems that represent a way...

  • Article
  • Open Access
16 Citations
4,350 Views
17 Pages

A Single-Phase Buck and Boost AC-to-AC Converter with Bipolar Voltage Gain: Analysis, Design, and Implementation

  • Naveed Ashraf,
  • Tahir Izhar,
  • Ghulam Abbas,
  • Valentina E. Balas,
  • Marius M. Balas,
  • Tsung-Chih Lin,
  • Muhammad Usman Asad,
  • Umar Farooq and
  • Jason Gu

10 April 2019

In this research, a new single-phase direct AC-to-AC converter, operating in buck and boost mode, with a bipolar voltage gain, is proposed. The operation is accomplished through high frequency direct and indirect PWM control of a single switch with l...

  • Article
  • Open Access
43 Citations
3,844 Views
16 Pages

10 April 2019

Taking gob-side entry retaining with large mining height (GER-LMH) of the 4211 panel in the Liujiazhuang coal mine as the engineering background, a numerical simulation was conducted to study the surrounding rock deformation, stress, and plastic zone...

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Energies - ISSN 1996-1073