Ning Jia¹, Xiangnan Wang^1,*, Linsheng Han², Hainan Xia¹

Energy Engineering, Vol.122, No.6, pp. 2389-2400, 2025, DOI:10.32604/ee.2025.064891 - 29 May 2025

Abstract With the depletion of fossil fuels and increasing environmental concerns, the development of renewable energy, such as wave energy, has become a critical component of global energy strategies. However, challenges persist in the field testing methodologies for wave energy converters (WECs). In this paper, a numerical wave field of the Dawanshan Island Sea Area in Zhuhai City is constructed based on the MIKE21 SW wave model and by using an NCEP wind field driving model. In conjunction with the IEC-62600-100 standard, by taking site testing of the “Wanshan” wave energy converter on which a sea… More >

Danijel Pavković^*, Pietro Kristović, Mihael Cipek, Dragutin Lisjak

Energy Engineering, Vol.122, No.5, pp. 1669-1696, 2025, DOI:10.32604/ee.2025.061916 - 25 April 2025

Abstract In deep drilling applications, such as those for geothermal energy, there are many challenges, such as those related to efficient operation of the drilling fluid (mud) pumping system. Legacy drilling rigs often use paired, parallel-connected independent-excitation direct-current (DC) motors for mud pumps, that are supplied by a single power converter. This configuration results in electrical power imbalance, thus reducing its efficiency. This paper investigates this power imbalance issue in such legacy DC mud pump drive systems and offers an innovative solution in the form of a closed-loop control system for electrical load balancing. The paper… More > Graphic Abstract

Xiaojuan Yu¹, Chao Liu^1,*, Quan Hua², Xiaohui Wang², Yongbin Li¹

Journal of Renewable Materials, Vol.10, No.10, pp. 2607-2621, 2022, DOI:10.32604/jrm.2022.019091 - 08 June 2022

Abstract With the growing level of awareness and increasing demand for environmental protection, timber pile revetments with significant ecological effects have experienced increasingly wide application in China. The current timber pile revetment system has two problems: continuous dense piles have high construction costs and require large timber consumptions, while the discrete pile-bamboo fence systems have poor retaining effects. Considering these problems, an original revetment structure form is proposed: a discrete pile-mulberry straw arch structure. To investigate the mechanical properties of the mulberry straw, some mechanical tests are conducted on mulberry straw and its arch structure. It… More > Graphic Abstract