Article
Energy & Fuels
Bartlomiej Bajan, Joanna Lukasiewicz, Agnieszka Poczta-Wajda, Walenty Poczta
Summary: The projected increase in global population necessitates an increase in food production, with a high reliance on energy. The energy return on investment (EROI) is an important indicator for energy efficiency, showing that underdeveloped regions have high EROI but insufficient food production, while highly developed regions have low EROI but strong food self-sufficiency.
Article
Computer Science, Artificial Intelligence
Osama Elsayed Abdelaziem, Ahmed Ahmed Gawish, Sayed Fadel Farrag
Summary: This study proposes a reference dataset for evaluating novelty detection algorithms in oilfields, and validates the reliability of the dataset by comparing it with real oilfield data. Additionally, the study investigates the role of statistics in optimizing the selection of outliers cut-off threshold, providing a foundation for a completely automated approach.
EXPERT SYSTEMS WITH APPLICATIONS
(2023)
Article
Ecology
O. Fullana Llinas, E. Tello Aragay, Mas Ivan Murray, G. Jover-Avella, J. Marull Lopez
Summary: This article analyzes the socioecological transition of an agroecosystem in Mallorca over a period of 150 years, from traditional organic farming to a fossil fuel-based system of agriculture. The shift in ownership of land and livestock, as well as the adoption of Green Revolution techniques, led to changes in productivity and sustainability of the agricultural system. Ultimately, the integration of agriculture into the tourist economy presented challenges to the reproduction of traditional biocultural landscapes.
ECOLOGICAL ECONOMICS
(2021)
Review
Green & Sustainable Science & Technology
David J. Murphy, Marco Raugei, Michael Carbajales-Dale, Brenda Rubio Estrada
Summary: This article introduces the concepts of net energy and Energy Return on Investment (EROI), and points out the lack of methodological consistency in various papers, leading to inaccurate comparisons across technologies. The authors provide a literature review and harmonization of EROI values to ensure accurate comparisons of thermal fuels and electricity production technologies.
Article
Geosciences, Multidisciplinary
Linqiang Wu, Tao Zhang, Hongtao Zhang, Yuzhang Sui, Xinghe Yu, Miao Miao
Summary: This study utilizes a new hybrid method based on the discounted cash flow (DCF) method and the energy return on investment (EROI) method to estimate the economic production rate of natural gas hydrate (NGH) exploitation in different gas price scenarios. The results show that key factors, such as the number of wells, gas-water ratio, and gas price, have a significant effect on the economic production rate.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Multidisciplinary Sciences
Aljosa Slamersak, Giorgos Kallis, Daniel W. O' Neill
Summary: Achieving the Paris Agreement requires massive deployment of low-carbon energy, but the transition itself may consume energy and result in substantial carbon emissions. Research finds that the transition will decrease the available net energy and increase the carbon emissions from the energy system.
NATURE COMMUNICATIONS
(2022)
Article
Green & Sustainable Science & Technology
Yi-Li Lin, Nai-Yun Zheng, Hsueh-Chien Wang
Summary: This study investigates the dewatering and reuse of activated sludge for solid biofuel. The results show that the combination of low H2O2 dose and pulse ultrasonication followed by torrefaction achieved zero-waste and promoted the release of protein and carbohydrate content in the supernatant. The biochar produced had lower greenhouse gas emissions and higher energy return on investment than burning coal. The proposed technology is environmentally and economically friendly and has potential practical applications in sludge disposal and renewable energy production.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Thermodynamics
Hareb Al-Jabri, Probir Das, Shoyeb Khan, Mohammad AbdulQuadir, Mehmoud Ibrahim Thaher, Kent Hoekman, Alaa H. Hawari
Summary: This study investigates the key factors and energy consumption of five promising marine microalgae biomass in the production of biofuel, and compares their energy balance and emission reduction potential. The results show that Tetraselmis has the greatest potential, with high energy surplus and emission reduction effect.
Article
Business, Finance
Lihua Qian, Qing Zeng, Xinjie Lu, Feng Ma
Summary: This paper investigates the value of global tail risk for oil return prediction and finds that the World Fear index performs well in predicting oil returns, especially during recessions, providing new insights for the oil market.
FINANCE RESEARCH LETTERS
(2022)
Article
Agronomy
Enric Tello, Vera Sacristan, Jose R. Olarieta, Claudio Cattaneo, Joan Marull, Manel Pons, Simone Gingrich, Fridolin Krausmann, Elena Galan, Ines Marco, Roc Padro, Gloria I. Guzman, Manuel Gonzalez de Molina, Geoff Cunfer, Andrew Watson, Joshua Macfadyen, Eva Frankova, Eduardo Aguilera, Juan Infante-Amate, Alexander Urrego-Mesa, David Soto, Lluis Parcerisas, Jerome Dupras, Lucia Diez-Sanjuan, Jonathan Caravaca, Laura Gomez, Onofre Fullana, Ivan Murray, Gabriel Jover, Xavier Cusso, Ramon Garrabou
Summary: Early energy analyses of agriculture showed a decrease in energy returns on energy invested in industrial farming compared to traditional organic agricultural systems. Recent studies indicate some improvement in energy returns due to efficiency gains. However, most agricultural energy studies have only focused on external input, neglecting the role of internal biomass flows from livestock and forestry. This study synthesizes the findings from 82 farm systems in North America and Europe from 1830 to 2012, highlighting the changing energy profiles in agroecosystems, including livestock and forestry. The results reveal a trend towards lower external returns, little or no increase in internal returns, and minimal improvement in total returns.
AGRONOMY FOR SUSTAINABLE DEVELOPMENT
(2023)
Article
Thermodynamics
Yi-Li Lin, Nai-Yun Zheng
Summary: This study found that the torrefaction temperature had a greater influence on the torrefied biomass than the torrefaction times, increasing the torrefaction temperatures and times resulted in biochar with comparable atomic ratios to lignite, with Passiflora edulis shells exhibiting higher thermal stability than Mangifera indica seeds.
Article
Agriculture, Multidisciplinary
Javier Baudracco, Belen Lazzarini, Noelia Rossler, Laura Gastaldi
Summary: This study investigated four strategies to double milk production in Argentina's grazing dairy systems. The results showed that intensification can increase milk production, but it requires higher capital investment and involves greater economic risks.
AGRICULTURAL SYSTEMS
(2022)
Article
Environmental Sciences
Wonsik Kim, Toshichika Iizumi, Nanae Hosokawa, Masahiro Tanoue, Yukiko Hirabayashi
Summary: Considering the rise in wet extremes due to climate change, it is important to assess the impact of floods on crop production in order to manage flood risks in agriculture effectively. A global calculation of inundation areas' return periods was conducted to analyze flood-induced crop yield changes, revealing significant yield losses for soy, rice, wheat, and maize. These losses amount to a total production loss of 5.5 billion dollars during the 1982-2016 period. This study provides valuable information for flood risk management in agriculture, but further research is needed to address the study's limitations.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Economics
Libo Yin, Sen Yang
Summary: This paper aims to increase understanding of the impact of oil price returns on fixed investment of Chinese non-financial listed companies. The empirical results show that oil price returns have a significant and negative predictive power for firm's fixed investment. Other main findings include the robustness of this effect across different oil shocks and sources, the heterogeneity of this effect across industries and industrial layers, and the combination of changes in demand stimulation and cost pressures contributing to the asymmetric impacts of oil price returns throughout the distribution.
Article
Energy & Fuels
Marco Vittorio Ecclesia, Joao Santos, Paul E. Brockway, Tiago Domingos
Summary: The declining EROIs of energy sources imply a decrease in the efficiency of extracting and producing energy globally. This study introduces a new societal EROI measure that takes into account a broader range of energy sources and the influence of imported and exported energy. Using Portugal as a case study, the new EROI is found to be considerably lower but stable, indicating its independence from economic growth. The declining societal EROI at the final stage emphasizes the importance of producing new and more efficient energy converting capital for a successful transition to renewables.