by Dan Fang  and Sri Narayan

Received: 25 May 2021;  Published: 13 August 2021;  doi: 10.21926/jept.2103038

Direct methanol oxidation catalysts Pt1-x-Tax (0

by Ganisetti Vijay Kumar  , Min-Ze Lu  and Chang-Ming Liaw

Received: 02 May 2021;  Published: 11 August 2021;  doi: 10.21926/jept.2103037

The development of high-efficiency motor drives for various applications is important in the industry 4.0 era, especially for their extensive application to electric vehicles (EVs). In this study, a position sensorless EV synchronous reluctance motor (SynRM) drive has been developed, which exhibits good driving performance and efficiency over a wide speed and load range. To solve the key problems popularly encountered in the existing approaches, the high-frequency injection (HFI) scheme based on q-axis injection ha [...]

by Ali Aldubaisi  and Jorge Valenzuela

Received: 26 April 2021;  Published: 04 August 2021;  doi: 10.21926/jept.2103036

Aging models are important input into wind farm maintenance and financial viability models. Aging of wind turbines depends on many factors, including both ambient and usage conditions. This paper presents a virtual age based maintenance model for wind turbines considering the effect of wind speed and ambient air temperature on turbine aging. Two maintenance thresholds (i.e., corrective threshold and preventive threshold) and three repair actions (i.e., unscheduled corrective, scheduled corrective and preventive act [...]

by Ganga R. Neupane  , Amrit Kaphle  , David N. Mcllroy  , Elena Echeverria  , Prasanna Sankaran  and Parameswar Hari

Received: 12 May 2021;  Published: 04 August 2021;  doi: 10.21926/jept.2103035

Iron doped ZnO (Fe-ZnO) nanoparticles were synthesized using two techniques that are economical as well as scalable to yield tunable properties of nanoparticles for facilitating down conversion in an absorbing layer of a solar cell. To evaluate the suitability of Fe-ZnO nanoparticles prepared by two deposition methods, we present a comparison of optical, electrical, and structural properties of Fe-ZnO using several experimental techniques. Structural properties were analyzed using transmission electron microscopy a [...]

by Syed Ali Muslim

Received: 05 February 2021;  Published: 19 July 2021;  doi: 10.21926/jept.2103034

This article offers the summary of detailed literature review on the state of the art of simulation tools for building energy and power system research. The fundamental capabilities required for building energy and power system analysis tools are outlined. A comparative review of different energy simulation tools is presented, along with the summary of their strengths and weaknesses. A review of energy simulation tool rankings using evidence-based research is presented. A novel aspect of this article is the investi [...]

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 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 [...]

by Shih-Ang Hsu

Received: 13 December 2020;  Published: 06 July 2021;  doi: 10.21926/jept.2103031

In September 2020 Hurricane Sally affected the north central Gulf of Mexico. Making use of the anemometers data available at 4 oil rigs over the affected region, it is found that, when the atmospheric stability was near-neutral, the gust factor (G) decreases linearly with height from approximately 1.28 at 35m above the sea surface to 1.18 at 160 m. In other words, G decreases linearly at the rate around 8% per 100 m from the typical hub height to beyond common hub height. Based on the linear equation found in this [...]

by Aditya Sharma  , Opeyemi Bello  , Catalin Teodoriu  and Hamidreza Karami

Received: 15 February 2021;  Published: 30 June 2021;  doi: 10.21926/jept.2102030

The Industry 4.0 is here, and advanced technologies are widely available for domains such oil and gas which are traditionally slow in adopting extreme new technologies. This paper presents the design architecture and implementation of effective data acquisition (DAQ) and monitoring system applied to an experimental sucker rod pumping unit for both event occurrence and educational purpose using latest technological advancements and industry 4.0 principles. The designed framework allows control and monitoring of anal [...]

by Kenji Morita  and Bun Tsuchiya

Received: 26 March 2021;  Published: 24 June 2021;  doi: 10.21926/jept.2102029

In this review, various studies on the Li depth profiles of metal/electrolyte/metal capacitors and batteries of Au/LCO/LATP/Pt, LCO/LiPON/Si, and LMO/LiPON/NbO with different metal electrodes at both sides (by bias; LCO =LiCoO2, LATP =Li3.1Al0.86Ti1.14Ge1.27P1.73O12, LMO =LiMn2O4, NbO = Nb2O5) using the in-situ reflection ERD (ERD) technique with 9MeV O+4 ion beam and transmission ERD (TERD) technique with 5MeV He+2 ion beam, respectively, are described. For capacitors, the transport fraction of Li-ion in the elect [...]