Article
Engineering, Civil
Brytne K. Okuhata, Donald M. Thomas, Henrietta Dulai, Brian N. Popp, Jonghyun Lee, Aly El-Kadi
Summary: The geologically complex western aquifers of Hawai'i Island serve as the primary reservoir of fresh potable water for residents, yet the area's hydrogeologic characteristics are still not well understood. This study implemented a multi-tracer approach to estimate the apparent ages of groundwater in the West Hawai'i aquifers. The results showed the presence of both young and old groundwater, with important implications for groundwater management.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
N. Anilkumar, Babula Jena, Jenson V. George, M. Ravichandran
Summary: Recent studies have shown that Antarctic Bottom Water has become fresher, warmer, and thinner in recent years, potentially impacting global climate, overturning circulation, and the biogeochemical cycle.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Shaoqing Zhang, Liping Lei, Mengya Sheng, Hao Song, Luman Li, Kaiyuan Guo, Caihong Ma, Liangyun Liu, Zhaocheng Zeng
Summary: This study evaluates the consistency and uncertainty of four commonly used emission inventories in China using satellite observations and machine learning methods. The results show significant inconsistencies among these inventories, especially in areas with high emissions. The inventories tend to overestimate emissions in Chinese cities and slightly underestimate emissions in the USA. The study also finds that the uncertainty of emission inventories is higher in Asian countries compared to Europe and the USA.
Article
Geochemistry & Geophysics
Rodrigo Perez-Moreno, Martin Reich, Linda Daniele, Diego Morata, Sebastian Held, Jackie Kleinsasser
Summary: This study combined stable isotopes, anthropogenic tracers, and geochemical data to investigate the origin, residence times, and evolution of thermal waters in the Lonquimay-Tolhuaca Volcanic Complex in the southern Chilean Andes. The discharge temperature of thermal waters correlates directly with the age distribution of the water samples, indicating different residence times due to distinct subsurface circulation pathways.
APPLIED GEOCHEMISTRY
(2021)
Article
Oceanography
Weimin Wang, Minggang Cai, Peng Huang, Hongwei Ke, Mian Liu, Lihua Liu, Hengxiang Deng, Bojun Luo, Chunhui Wang, Xuehong Zheng, Wenquan Li
Summary: The study utilized CFC-12 and SF6 data to estimate the mean age of water in the northern South China Sea and explored oceanographic processes related to time. Significant differences in mean water ages were observed at different density levels on both sides of the Luzon Strait, showing distinct flow patterns and transit times. The research highlighted a strong correlation between temperature and apparent oxygen utilization rates, suggesting that climate change and ocean warming could have significant impacts on oxygen consumption in the ocean, warranting further investigation.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Engineering, Electrical & Electronic
Wenqiang Gao, Yang Cao, Yifei Wang, Capri Price, JoAnne Ronzello, Nenad Uzelac, Andres Laso, Mattewos Tefferi, Kennedy Darko
Summary: Recent studies have shown that C4F7N/CO2 gas mixture is a promising alternative to SF6 as an insulation gas in gas-insulated apparatuses. This study investigates the compatibility of different materials with the C4F7N/CO2 gas mixture during long-term thermal aging. The results indicate that while some materials are well compatible, others exhibit incompatibility, highlighting the importance of careful material selection in the application of alternative insulating gases.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Article
Biodiversity Conservation
Carlos Angulo-Preckler, Marta Turon, Kim Praebel, Conxita Avila, Owen S. Wangensteen
Summary: This study examined the molecular eukaryotic biodiversity patterns in shallow hard-bottom Antarctic benthic communities using community DNA metabarcoding. Polar ecosystems are highly vulnerable to climate change and benthic macroinvertebrate communities have shown rapid responses to various pressures. However, there is limited knowledge about the biodiversity of Antarctic benthos associated with hard-bottom habitats.
DIVERSITY AND DISTRIBUTIONS
(2023)
Article
Engineering, Electrical & Electronic
Feng Wang, Dexiong Hu, Lipeng Zhong, Jie Liu, She Chen, Nian Tang, Xingshuo Song
Summary: This article investigates the surface flashover characteristics of epoxy resin in HFO-1336mzz(E)/buffer-gas mixtures. It is found that more solid by-products are generated in HFO-1336mzz(E)/N-2 gas mixtures, resulting in lower tolerance compared to HFO-1336mzz(E)/CO2 gas mixtures. The surface flashover voltage of HFO-1336mzz(E)/CO2 gas mixtures increases with gas pressure or mixing ratio, and there is a positive synergistic effect between HFO-1336mzz(E) and CO2.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
Article
Engineering, Electrical & Electronic
Faisal Omar Bahdad, Lujia Chen, Prem Ranjan, Simon Rowland
Summary: This article provides an experimental study on the factors affecting the DC breakdown of electronegative gases. The results show that the breakdown voltages increase linearly with gap distance in quasi-uniform fields, with saturation in the positive polarity and a linear increase in the negative polarity. The 20% C3F7CN / 80% CO2 mixture shows potential as an alternative to SF6 in outdoor applications in hot-climate countries and indoor applications in cold-climate countries.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2022)
Article
Engineering, Electrical & Electronic
Juriy Pachin, Andreas Hoesl, Christian M. Franck, Siddharth Kumar, Tom Huiskamp, A. J. M. Pemen
Summary: The experimental results show that the proportion of N2O in N2O/CO2 mixtures is crucial for increasing the breakdown strength. By controlling the ratio of N2O in the mixtures, a higher electric strength can be achieved compared to synthetic air and SF6.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2021)
Article
Engineering, Electrical & Electronic
Ibrahim Iddrissu, Lujia Chen, Faisal Omar Bandad, John Dabin, Denis Joassin, Louis Maksoud, Yannick Kieffel
Summary: This study explores the technical feasibility of using a C3F7CN/CO2 gas mixture as a retro-filling solution for existing SF6-insulated accelerators. Experimental analysis shows that the C3F7CN/CO2 gas mixture has higher breakdown strength compared to SF6 under conditions of high field uniformity, while SF6 performs better in non-uniform field conditions. The results indicate that the C3F7CN/CO2 gas mixture may potentially be used as a replacement for SF6 in accelerators.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2021)
Proceedings Paper
Green & Sustainable Science & Technology
Hidir Duzkaya, Suleyman S. Tezcan, M. Sezai Dincer, Sebla Dincer
Summary: This study primarily calculates the electron swarm parameters and limit electric fields of SF6-Argon (Ar) and SF6-Carbon Dioxide (CO2) mixtures, and analyzes the synergy effect of these mixtures. The findings show a positive synergy effect that increases the dielectric strength for all SF6 ratios in both mixtures, with SF6-CO2 mixture exhibiting almost twice the synergy effect coefficient compared to SF6-Ar mixture. These results support the potential use of dilute and ultra-dilute SF6 added SF6-CO2 mixtures as insulators in GIS equipment.
2022 IEEE INTERNATIONAL CONFERENCE ON ENVIRONMENT AND ELECTRICAL ENGINEERING AND 2022 IEEE INDUSTRIAL AND COMMERCIAL POWER SYSTEMS EUROPE (EEEIC / I&CPS EUROPE)
(2022)
