Hydrochemistry Characteristics And Genesis Mode Of Hot Springs In The Luolou River Basin, Yunnan, China,
2024
Faculty of Geosciences and Environment Engineering, Southwest Jiaotong University, Chengdu 611756, China
Hydrochemistry Characteristics And Genesis Mode Of Hot Springs In The Luolou River Basin, Yunnan, China, Luo Huan, Liu Zhennan, Ma Yiqi, Zhang Yunhui, Tao Lanchu, Chen Qingsong, Fu Dunkai, Wu Xiangchuan
Coal Geology & Exploration
The hydrochemistry and genesis mechanism of thermal springs hold great significance for the exploitation and utilization of low to intermediate temperature geothermal resources. Under the influence of a concealed fault zone, thermal springs in the Luolou River basin, Yunnan Province, are distributed along both sides of valleys and exposed in Quaternary loose deposits and Permian basalt strata. It belongs to low to intermediate temperature thermal spring water, with temperatures ranging between 34.5 and 50.0℃, pH is between 7.62-9.73, TDS is between 262-702 mg/L. Based on the hydrochemical and isotopic tests of thermal spring samples and nearby cold water samples from …
A Joint Operation Mode Of Multi-Production Wells For Deep Geothermal Water Exploitation,
2024
Institute of Resources & Environment, Henan Polytechnic University, Jiaozuo 454000, China
A Joint Operation Mode Of Multi-Production Wells For Deep Geothermal Water Exploitation, Ping Yu, Li Fang, Ji Wenqing, Yuan Xiaoying, Qi Yufeng, Deng Xiaoying, Wang Xinyi
Coal Geology & Exploration
Deep geothermal water, a type of clean and low-carbon renewable energy, plays a significant role in achieving the goals of peak carbon dioxide emissions and carbon neutrality. However, its irrational exploitation will lead to many problems such as decreased water quantity, lowered water level, and low engineering benefits. Based on the available exploration data of geothermal wells in the urban area of Kaifeng City, Henan Province, this study constructed a hydrogeological model used to characterize the migration of geothermal water and a corresponding mathematical model, which was identified and verified using the Galerkin finite element method. Focusing on geothermal reservoirs …
Major Challenges Of Deep Geothermal Systems And An Innovative Development Mode Of Regs Integrated With Energy Storage,
2024
Institute of Subsurface Energy Systems, Clausthal University of Technology, Clausthal-Zellerfeld 38678, Germany
Major Challenges Of Deep Geothermal Systems And An Innovative Development Mode Of Regs Integrated With Energy Storage, Hou Zhengmeng, Wu Xuning, Luo Jiashun, Zhang Liehui, Li Zaoyuan, Cao Cheng, Wu Lin, Chen Qianjun
Coal Geology & Exploration
China has long been a global leader in the direct utilization of moderate- to low-temperature geothermal energy, in contrast to its sluggish progress in power generation using deep geothermal energy. Rocks in deep reservoirs exhibit decreased permeability under high-temperature and high-pressure conditions, necessitating the establishment of engineered geothermal system (EGS) for the exploitation of deep geothermal energy. In an EGS, hydraulic fracturing is employed for reservoir stimulation to create artificially enhanced geothermal reservoirs with higher permeability. The current techniques for deep geothermal reservoir stimulation are predominantly borrowed from hydraulic fracturing processes employed in the oil and gas sector, placing limitations …
Evaluating The Exploitation And Utilization Prospects Of Hot Dry Rock In Bohai Bay Basin: Understanding Based On Numerical Simulations For Exploitation Optimization,
2024
College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China; National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Evaluating The Exploitation And Utilization Prospects Of Hot Dry Rock In Bohai Bay Basin: Understanding Based On Numerical Simulations For Exploitation Optimization, Jiang Xiaoxue, Zhu Chuanqing, Ding Rui, Xie Fang, Qiu Nansheng
Coal Geology & Exploration
The Bohai Bay Basin, characterized by high terrestrial heat flow, formation temperatures average of 175℃ at a depth of 5000 m, and reservoirs with lithologies dominated by low-porosity and low-permeability metamorphic and igneous rocks, meets the requirements for the formation of hot dry rock (HDR) resources. Based on geothermal parameters such as terrestrial heat flow, rock thermal conductivity, and heat production rate, this study established a three-dimensional HDR exploitation model with thermo-hydro coupling using the COMSOL software. Furthermore, this study analyzed the effects of spacing between production and reinjection wells, reinjection and production rates, and well arrangement mode on the …
Influencing Patterns Of Multiple Factors On The Heat Transfer Performance Of Moderately Deep Geothermal Wells,
2024
CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China; CCTEG Xi’an Geothermal Energy Development Co., Ltd., Xi’an 712100, China
Influencing Patterns Of Multiple Factors On The Heat Transfer Performance Of Moderately Deep Geothermal Wells, Han Yongliang, Wang Kaipeng, Wang Yijie, Gou Li, Yang Yanbin, Lei Yanzi, Wu Fangli, Shen Hao
Coal Geology & Exploration
Vigorously promoting the technology for heating using moderately deep geothermal energy serves as an important measure for China’s pursuit of carbon neutrality and peak carbon dioxide emissions. A coaxial double-pipe heat transfer system for moderately deep geothermal wells can avoid damage to groundwater resources and the environment. Furthermore, the influencing factors of the wells exhibit complicated and nonlinear interactions. Based on the theoretical analysis and mathematical description of a moderately deep well with a coaxial double-pipe heat exchanger, this study established a layered heat transfer model for the geothermal well and verified its reliability. This study investigated a moderately deep …
Effects Of Fracture Distribution On Heat Extraction Through Co2-Egs,
2024
College of Civil Engineering, Guizhou University, Guiyang 550025, China
Effects Of Fracture Distribution On Heat Extraction Through Co2-Egs, Zhou Qing, Liao Jianxing, Xu Bin, Yao Liang, Zhou Haoyu, Zhao Quan
Coal Geology & Exploration
Geothermal energy, a promising source of renewable energy, has attracted considerable attention. In deep geothermal reservoirs, complex fracture networks formed by artificial stimulation provide predominant channels for heat extraction. Therefore, the spatial distribution of fractures directly affects the heat extraction efficiency. This study aims to explore the effects of different spatial distributions of fractures on the heat recovery performance. Based on the fracture network following a power-law distribution, this study systematically investigated the effects of the fracture network with different values of fracture length index (a) and density (β) on the heat recovery performance of a …
Statistical Analysis Of The Spatial Distribution And Genesis Of Lithium In Geothermal Water In The Yangbajing-Gulu Rift, Xizang,
2024
Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; School of Geoscience & Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Statistical Analysis Of The Spatial Distribution And Genesis Of Lithium In Geothermal Water In The Yangbajing-Gulu Rift, Xizang, Chen Yakui, Kong Yanlong, Duan Jiabin, Sun Wenjie, Cheng Yuanzhi
Coal Geology & Exploration
In the Yangbajing-Gulu rift, located in Xizang, the lithium concentration in geothermal water exceeds the average level of thermal springs in Xizang. However, the hydrochemical genesis of lithium in geothermal water in this rift remains controversial, and one primary reason for this is the unclear spatial distribution pattern of lithium. Common methods for analyzing spatial distribution patterns include Ordinary Kriging and CO-Kriging. Nevertheless, the former suffers low precision. For the latter, it is difficult to obtain suitable auxiliary variables. Given this, this study determined two auxiliary variables: (1) the Cl− concentration, a physicochemical parameter exhibiting the strongest correlation with …
Scientific Approach To Building A Highland Of Ecological Civilization In Xizang Of China,
2024
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610299, China
Scientific Approach To Building A Highland Of Ecological Civilization In Xizang Of China, Xiaodan Wang, Jianxin Zhang, Da Wei, Hui Zhao, Jiangtao Hong, Yuling Liang, Yahui Qi, Zhengrong Yuan
Bulletin of Chinese Academy of Sciences (Chinese Version)
Xizang, which plays an important barrier role in maintaining national ecological security, is a unique region that ensures China’s sustainable development and leads the construction of national ecological civilization. The Seventh Central Conference on the Work of Xizang has set clear goals and specific requirements for building an ecological civilization highland on the Qinghai-Xizang Plateau, which were identified as a new mission and task of Xizang government for environmental protection and sustainable development in the new era. Based on the previous research achievements about national ecological security barrier, this work further carried out the systematic study of ecological civilization highland …
Internal Logic And Policy Recommendations Of Big Data To Support High-Quality Development Of Modern Agricultural Industry,
2024
Institutes of Science and Development, Chinese Academy of Sciences, Beijing 100190, China; School of Public Policy and Management, University of Chinese Academy of Sciences, Beijing 100049, China
Internal Logic And Policy Recommendations Of Big Data To Support High-Quality Development Of Modern Agricultural Industry, Yingming Li, Zitong Wang, Mingyue Wang, Shiyi Liu
Bulletin of Chinese Academy of Sciences (Chinese Version)
Clarifying the internal logic of big data to support modern agricultural production is helpful to cultivate and develop new quality productive forces in agriculture. From the perspective of economics, this study proposes that the role of big data in modern agricultural production is mainly reflected in two levels. Firstly, it improves the total factor productivity of the traditional agricultural production function. Secondly, it changes the factor endowment structure of agricultural production and forms a new agricultural production function. Based on these, the realization form of big data to support modern agricultural production can be summarized as improving the efficiency of …
Strengthen Research On Environmental Control Technologies And Management Policies For Emerging Contaminants In China,
2024
Chongqing Key Laboratory of Interface Process and Soil Health, College of Resources and Environment, Southwest University, Chongqing 400716, China
Strengthen Research On Environmental Control Technologies And Management Policies For Emerging Contaminants In China, Ying Ma, Xiang Li, Yongming Luo
Bulletin of Chinese Academy of Sciences (Chinese Version)
The prevention and management of emerging contaminants (ECs) have become critical measures in China’s battle against environmental pollution. This study focuses on the environmental control technologies and policy governance related to emerging contaminants (ECs), analyzing their environmental pathways and challenges to public health, and highlighting advancements and limitations in current physical, chemical, and biological control technologies. Based on a comprehensive analysis of international policies and regulations on ECs control, the study identifies existing challenges and shortcomings in domestic management. Recommendations are proposed to enhance research on environmental control technologies and policies for ECs in China, aiming to provide insights for …
Development And Utilization Of Mineral Resources In The Arctic And China’S Strategic Countermeasures,
2024
Chinese Academy of Natural Resources Economics, Beijing 101149, China
Development And Utilization Of Mineral Resources In The Arctic And China’S Strategic Countermeasures, Yina Su
Bulletin of Chinese Academy of Sciences (Chinese Version)
There are abundant strategic mineral resources as oil, gas, iron ore, copper, and nickel in the Arctic region. If the Arctic routes can be opened in the future, they will become another important transportation channels connecting the Pacific and Atlantic Oceans, following the Panama Canal and the Suez Canal, which may reshape the world’s maritime trade and transportation pattern. With the development of science and technology, increase in mineral resources consumption and changes in the international environment, the strategic position of the Arctic region is increasingly elevated, and the United States, Russia and some other countries of the European Union …
Redesign And De Novo Design Of Circular Blue Bioindustry,
2024
Flinders University, Adelaide SA 5001, Australia; Marine Bioproducts Cooperative Research Centre, Adelaide SA 5067, Australia
Redesign And De Novo Design Of Circular Blue Bioindustry, Wei Zhang, Shufeng Zhang, Hantao Zhou, Minhan Dai
Bulletin of Chinese Academy of Sciences (Chinese Version)
The future marine bioindustry, which features advanced green intelligent biomanufacturing and high-value marine bioproducts, is a strategically emerging marine industry. This study proposes a new industrial development model for the circular blue bioindustry, founded on simultaneously optimizing the sustainable utilization of marine bioresources and protecting the ecological environment. Through in-depth analysis of the current situation, challenges, and potential development opportunities of the global and Chinese marine bioindustries underpinning sustainable development, theoretical framework, approaches and implementation pathways have been established to redesign the existing marine bioindustry and de novo design of the emerging marine bioindustry. Future key development priorities are suggested …
Program Requirements For Beef Cattle Certified As Usda Organic,
2024
University of Nebraska-Lincoln
Program Requirements For Beef Cattle Certified As Usda Organic, Carsten Loseke, Elliott James Dennis
Cornhusker Economics
This document provides an overview of the use and production of the USDA Certified Organic program for the beef cattle industry, with an emphasis on the state of Nebraska. We detail what cattle qualify, feed requirements, medical and health standards of cattle, and premiums paid by consumers for USDA certified organic products. All information is taken from the Organic Foods Production Act Provisions available in the Federal Register.
Households' Preferences For Alternative Renewable Energy Technologies: An Attribute-Based Choice Experiment Survey In Metro Manila, Philippines,
2024
Ateneo de Manila University
Households' Preferences For Alternative Renewable Energy Technologies: An Attribute-Based Choice Experiment Survey In Metro Manila, Philippines, Rosalina Palanca-Tan, Daniel Del Barrio Alvarez, Ruth S. Palanca, Nelson Matthew P. Tan, Gem B. Castillo, Dino Carlo A. Saplala, Nan Wang
Economics Department Faculty Publications
Using a choice-based conjoint analysis, we measured willingness to pay (WTP) for an increase in the share of specific Renewable Energy (RE) technologies, namely solar, wind, biomass, and small-scale hydropower. The study found that on average, Metro Manila (MM) households are WTP an additional 19.3% of their electricity bill for an additional 20% share of RE in electric power capacity that is sourced from solar power. The corresponding WTP for the other RE technologies are substantially lower - 11.9% for biomass, 10.5% for wind, and 9.8% for small-scale hydropower. The skewed preference for solar energy augurs well for the government's …
The Valuation Of Exit Option In A Lignite Mine Using Monte Carlo Simulation,
2024
University of Szczecin, Department of Banking and Finance, Poland
The Valuation Of Exit Option In A Lignite Mine Using Monte Carlo Simulation, Marcin Pawlak, Tomasz Wiśniewski
Journal of Sustainable Mining
This study aims to demonstrate the application of simulation techniques to the valuation of real options. The nature of the paper is methodological and empirical. The purpose of the valuation of the option to close a lignite mine in Poland is to demonstrate the methodology and advantages of employing Monte Carlo simulation in the valuation of real options. Close to actual numerical data reveals a complex optimization problem in the context of strategy selection by decision-makers. Numerous factors (extraction costs, reclamation costs, the write-off for the reclamation fund, etc.), their interpenetration and multilevel influence on the decision to close the …
Mathematical Model For The Management Of The Wave Processes In Three-Winding Transformers With Consideration Of The Main Magnetic Flux In Mining Industry,
2024
Lviv Polytechnic National University, 79013, L'vov, Stepana Bandera st., 12, Ukraine
Mathematical Model For The Management Of The Wave Processes In Three-Winding Transformers With Consideration Of The Main Magnetic Flux In Mining Industry, M. S. Seheda, O. S. Beshta, P. F. Gogolyuk, Yu. V. Blyznak, R. D. Dychkovskyi, A. Smoliński
Journal of Sustainable Mining
The aim of the work is to study the wave processes in three-winding power transformers caused by impulse overvoltage, to create an improved mathematical model for reproducing the process of distribution and transmission of the impulse in the windings of a three-winding power transformer. A mathematical model has been developed for the study of internal overvoltage in the windings of three-winding power transformers, based on the proposed substitute circuit of an infinitesimal element, taking into account the longitudinal and transverse inductive connections between the turns of the winding, the electromagnetic connections between the windings and the flux splitting from the …
The Effect Of Blasting Using Low-Density Emulsion Explosives,
2024
Faculty of Mining, Geology and Petroleum Engineering, Department of Mining Engineering and Geotechnical Engineering, University of Zagreb, Pierottijeva 6, 10000, Zagreb, Croatia
The Effect Of Blasting Using Low-Density Emulsion Explosives, Vinko Škrlec, Mario Dobrilović, Barbara Štimac Tumara, Vječislav Bohanek
Journal of Sustainable Mining
Low-density emulsion explosives are essentially blends of an emulsion matrix and a certain amount of gaseous phase inclusions acting as hot spots. With the addition of expanded polystyrene for gaseous sensibilization, the resulting explosive blend was developed to reduce peak values and pressure impulse of gaseous detonation products on surrounding rock. This resulted in a decrease in rock stress and a decrease in cracking zone width outside of the minefield boundary. The use of low-density emulsion explosives correlates with the decrease in the seismic effect of blasting, more precisely, the decrease of induced rock oscillation velocities. The low-density emulsion explosive …
Numerical Simulation On Effect Of Coal Pillar Width On Stability Of Retained Roadway: A Case Study Of Khe Cham Coal Mine, Vietnam,
2024
Faculty of Mining, Hanoi University of Mining and Geology, Vietnam
Numerical Simulation On Effect Of Coal Pillar Width On Stability Of Retained Roadway: A Case Study Of Khe Cham Coal Mine, Vietnam, Quang Phuc Le, Tien Dung Le
Journal of Sustainable Mining
When extracting coal seams in Vietnam underground mines, coal pillars are often left unmined for the protection of retained roadways in the longwall mining method. During longwall mining operations, coal pillars are often placed where high-stress concentrations occur in the abutment pressure zone of adjacent panels, especially when extracting seams under hard-to-cave main roof conditions. The instability of coal pillars under the loading of the main roof may cause the roadway to collapse, threatening the safe operation of a coal mine. This paper presents a detailed numerical investigation of the effect of coal pillar width on the stability of retained …
Assessing Compliance To Water Resources And Reconstruction Framework During Post-Conflict Reconstruction Borno State,
2024
National Institute For Policy And Strategic Studies Kuru Jos
Assessing Compliance To Water Resources And Reconstruction Framework During Post-Conflict Reconstruction Borno State, Muritala Olaniyi Oke Dr
Journal of African Conflicts and Peace Studies
Northeast and northwest of Nigeria have, as a result of activities of Boko Haram, bandit and kidnappers, had their public and private properties destroyed. Governments and other stakeholders, upon some successes of the military, have started post-conflict reconstruction to rebuild the war-torn urban and rural communities with the provision of water taking the center stage. This paper looks at the utilisation of Water Resources and a Reconstruction framework for integrating water projects into reconstruction processes. This paper rests on the argument that water projects during reconstruction should not be handled as “normal” water projects and that a more culturally and …
Fauna, Flora, And Land Cover Changes Over The Last Two Decades In The Mobile-Tensaw River Delta,
2024
University of South Alabama, Mobile, AL
Fauna, Flora, And Land Cover Changes Over The Last Two Decades In The Mobile-Tensaw River Delta, Gabriel De Oliveria, Steven R. Schultze, Guilherme Mataveli
Technical Reports
A technical report documenting ecosystem changes to the Mobile-Tensaw River Delta region due to urban expansion over approximately two decades (2001-2019).
