by Nikolai A. Zarkevich

Received: 30 September 2019;  Published: 06 January 2020;  doi: 10.21926/jept.2001001

Most power plants produce electricity by converting a mechanical motion into alternating current (AC). Photovoltaic solar panels convert an electromagnetic flux of light into direct current (DC). In general, electric energy can be harvested from a flux in the environment or from a change of the environment itself. One can produce electricity from mechanical, chemical, thermal, electromagnetic (light), or another physical flux, or from a change of temperature, chemical composition, or a physical field: gravitationa [...]

by Cenk Temizel  , Hakki Aydin  , F. Bahar Hosgor  , Cengiz Yegin  and C. Shah Kabir

Received: 25 September 2022;  Published: 28 January 2023;  doi: 10.21926/jept.2301004

In recent years, the oil and gas sector has been moving towards green production methods to achieve net-zero emission goals. Governments and corporations have started large-scale initiatives to deploy advanced technologies to reduce carbon footprints and prevent global warming. Herein, we have explored the emerging techniques and methods used in reducing the effects of gas emissions in the oil and gas industry. The transition process from hydrocarbons to renewable energy resources, including solar thermal applicati [...]

by Hironori Takagi  , Koichi Kakimoto  , Daishuke Mori  , Sou Taminato  , Yashuo Takeda  , osamu yamamoto  and Nobuyuki Imanishi

Received: 12 January 2021;  Published: 24 February 2021;  doi: 10.21926/jept.2101010

The demand for high energy density rechargeable batteries beyond lithium-ion batteries has increased for electric vehicles. In the present study, a novel high energy density rechargeable aqueous lithium battery was proposed. The battery was composed of a lithium metal anode, a lithium-stable non-aqueous electrolyte, a water-stable lithium-ion conducting solid electrolyte of Li1.4Al0.4Ge0.2Ti1.4(PO4)3-epoxy-TiO2 separator, and a hydroquinone sulfonic acid (HQS)/benzoquinone sulfonic acid (BQS) redox couple in an aqu [...]

by Chenchang Li  , Jianqiang Hu  , Jie Yu  , Jieci Xue  , Runze Yang  , Yijie Fu  and Bo Sun

Received: 23 April 2021;  Published: 15 July 2021;  doi: 10.21926/jept.2103033

Due to the uncertainty and volatility of wind speed, its natural output power also exhibits strong volatility. In order to avoid the negative effects of the excessive fluctuation of the output power of wind turbines in the wind farm and the power grid, it is very important to accurately predict and reasonably plan and control the output power of the wind farm. Model predictive control (MPC) is a type of advanced control method that can deal with a multi-input multi-output nonlinear system. Compared to the tradition [...]

by Anna Castaldo  , Emilia Gambale  and Giuseppe Vitiello

Received: 19 January 2021;  Published: 02 April 2021;  doi: 10.21926/jept.2102015

This study deals with the production of zinc silicate thin films employing a solid-state reaction at temperatures ranging from 300 °C to 560 °C, to develop new inorganic, n-type materials with seemingly incompatible properties as low work function, high mobility, and high visible transmittance. Depending on a careful reaction control, zinc silicates can preserve reagents (silicon and/or ZnO) as nanoaggregate guests, exhibiting tunable light absorption and emission properties that make them useful for differ [...]

by Lucy Wyatt

Received: 24 November 2020;  Published: 22 January 2021;  doi: 10.21926/jept.2101005

This paper presents the case for the use of HF radar to provide wave, current and wind measurements and maps during the surveying, resource and impact assessment, construction, maintenance and performance assessment phases of an offshore fixed or floating wind farm or other marine renewable project. The data presented are from the Celtic Sea which is currently the focus of a lot of offshore wind interest. The data are from a dual radar system deployed at the Wave Hub site off the Cornwall coast since 2011, a single [...]

by Fabien Leurent

Received: 10 March 2022;  Published: 18 July 2022;  doi: 10.21926/jept.2203025

The carbon footprint of motorized transport modes per unit length traveled encompasses the unit share of the vehicle lifetime emissions, that of the transport infrastructure, and those of the motor energy, considered both from “well to tank” and from “tank to wheel”. In the active modes of transport, i.e., walking and cycling, the counterpart of motor energy is human energy, which is associated with two kinds of carbon flows: the carbon footprint of food intake, – which we call the Food to Body component – and the [...]

by Samuel Cruz-Manzo

Received: 31 July 2020;  Published: 24 November 2020;  doi: 10.21926/jept.2004017

In this study, uncertainties during the assessment of the electrochemical impedance spectrum of the polymer electrolyte fuel cell (PEFC) attributed to inductive artefacts at high frequencies and inductive loops at low frequencies as well as oxygen diffusion time constant are discussed. A validated impedance model represented as an equivalent electrical circuit of a PEFC allowed the simulation of the effect of inductive artefacts, inductive loops and oxygen diffusion time constant on electrochemical impedance spectr [...]

by Antonio Vázquez-López  , Marina García-Carrión  , Erlend Hall  , Anisa Yaseen  , Ilknur Kalafat  , María Taeño  , Junjie Zhu  , Xinyu Zhang  , Elif Arici  , Omer Suat Taskin  , David Maestre  , Emilio Nogales  , Pedro Hidalgo  , Julio Ramírez-Castellanos  , Bianchi Méndez  , Neslihan Yuca  , Smagul Karazhanov  , Erik S. Marstein  and Ana Cremades

Received: 09 November 2020;  Published: 08 May 2021;  doi: 10.21926/jept.2102020

Hybrid composites based on inorganic nanomaterials embedded into a polymer matrix have were synthesized and characterized. Oxide semiconductor nanoparticles (SnO, SnO2, TiO2, Ga2O3, and NiO) and Si nanoparticles were employed as inorganic counterparts in the hybrid composite, while a conductive polymer (PEDOT:PSS) with diverse additives was used as the organic matrix. The composites were spin-coated on Si or glass substrates. The potential use of these materials in photovoltaic devices to improve Si surface passiva [...]

by Xiuhui Tang  , Daming Zhang  and Hua Chai

Received: 19 May 2021;  Published: 08 July 2021;  doi: 10.21926/jept.2103032

In AC microgrid systems, technical issues resulting from the power control effect are the power control method efficiency and the filter resonance since voltage-frequency interference and filtering resonance may cause significant control input reduction and oscillation. A simple and robust solution is to regulate active power flow by adding an optimal passive damping resistor. The optimal LCL filter parameterization process in this paper provides an innovative approach to obtain the optimal quality factor and the o [...]