44 results on '"Haoxuan Yu"'
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2. Effect of biological shells aggregate on the mechanical properties and sustainability of concrete
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Xianpeng Wang, Haoxuan Yu, Fulong Li, Kovshar Sergey Nikolayevich, Haojue Yu, Leonovich Sergey Nikolaevich, and Wenbing Fan
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Aggregate concrete ,Shell aggregate ,Mechanical properties ,Carbon emission ,Economic analysis ,Medicine ,Science - Abstract
Abstract The recycling bio-waste shells problem has grown more and more serious in recent years and many efforts have been made to solve this problem. One possible solution is to put these bio-shells into concrete and recycle them as building materials using the aggregate matrix concrete approach. To verify the engineering feasibility, the mechanical properties of bio-shells aggregated concrete were invested via gradient substitution rates at 10%, 30%, and 50% with a total of 78 groups of specimens in this paper. Our results show that the mechanical properties of the concrete were enhanced in maximum flexural strength and maximum compressive. Economic performance was also analyzed and found that the costs of frame-shear structure, frame structure, and tube-in-tube structure were reduced by 10.2%, 10%, and 10.3%. The carbon environmental assessment also shows superiority in the carbon reduction of a single specimen with various rates of the shell. In summary, compared with ordinary concrete materials, it is very possible to use waste bio-shells as a substitute for aggregates to develop the sustainable recycling development of concrete materials.
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- 2024
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3. China's green building revolution: Path to sustainable urban futures
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Haoxuan Yu, Bodong Wen, Izni Zahidi, Chow Ming Fai, and Dag Øivind Madsen
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Green building practices ,Renewable energy integration ,Eco-friendly construction ,Urban energy efficiency ,Technology - Abstract
This paper critically examines the significant strides China has made toward sustainable urban development, emphasizing the evolution of green building practices since 2015. Through a detailed analysis of green building policies under China's 13th and 14th Five-Year Plans, as well as the General Code for Building Energy Conservation and Renewable Energy Utilization, this study highlights the progressive integration of sustainability in construction. Notable advancements include the implementation of stringent energy efficiency standards and the incorporation of renewable energy technologies, which have collectively shifted the paradigm of architectural practices in urban China. Moreover, the paper draws upon several case studies, such as the Shanghai Chenghuaxinyuan Project and Mini Sky City, to illustrate the tangible outcomes and the effectiveness of these policies in real-world settings. These examples not only demonstrate significant reductions in energy consumption and carbon emissions but also reflect the scalability and replicability of such initiatives in other urban contexts. Key findings suggest that China's proactive policy landscape has catalyzed a national movement towards environmentally responsible construction, setting a global benchmark for sustainable urban development. The paper argues that these policy-driven initiatives have important implications for practitioners, who are encouraged to adopt innovative construction technologies and sustainable practices. For policymakers, the study underscores the necessity of continuous support for research and development in green technology, coupled with robust regulatory frameworks to sustain momentum in the green building sector. Finally, the paper offers comprehensive recommendations aimed at enhancing the efficacy and adoption of green building practices, proposing that future policy directions should focus on integrating smart city technologies to further optimize energy use and urban sustainability.
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- 2024
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4. Reproductive toxicity and gene expression alterations in aquatic environments: Expanding the insights of the recent guppy study on PFAS exposure
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Haoxuan Yu
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Environmental sciences ,GE1-350 - Published
- 2024
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5. Elevating community well-being in mining areas: the proposal of the mining area sustainability index (MASI)
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Haoxuan Yu, Izni Zahidi, Chow Ming Fai, Dongfang Liang, and Dag Øivind Madsen
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Sustainable mining ,Green technologies ,Mining policy ,Environmental sciences ,GE1-350 ,Environmental law ,K3581-3598 - Abstract
Abstract In response to the urgent environmental and social challenges posed by mining operations, this paper introduces the Mining Area Sustainability Index (MASI), a novel framework aimed at transforming the mining sector towards sustainable practices. Mining activities have historically led to significant environmental degradation, including water contamination and habitat destruction, contributing to climate change and biodiversity loss. These activities also have profound social implications, such as displacing communities, endangering health, and distributing economic benefits inequitably, often leaving local communities in developing countries marginalized. Recognizing these challenges, this paper outlines the consolidation and standardization in sustainability reporting within the mining sector as a pivotal development. The introduction of international standards by the International Sustainability Standards Board (ISSB) and the European Union's European Sustainability Reporting Standards (ESRS) marks significant strides towards enhancing transparency, accountability, and sustainability across mining operations. Furthermore, the concept of double materiality, assessing both financial and social impacts of mining, represents an advancement in comprehending the broader societal impacts of mining alongside its environmental and economic effects. MASI emerges as a comprehensive tool designed to assess the sustainability of mining areas, offering a nuanced understanding of mining activities' impacts on local environments, societies, and economies. By focusing on localized, community-centric evaluations, MASI aims to fill existing gaps in sustainability assessment and provide a reference for local residents to gauge the sustainability of their surroundings. This framework advocates for a multidimensional approach to sustainability, encompassing ecological preservation, social welfare, and economic viability, urging a reimagined, sustainable future for mining communities.
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- 2024
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6. Can aerosol optical depth unlock the future of air quality monitoring and lung cancer prevention?
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Haoxuan Yu, Izni Zahidi, Chow Ming Fai, Dongfang Liang, and Dag Øivind Madsen
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Environmental health ,Air quality ,Remote sensing ,Public health ,Environmental sciences ,GE1-350 ,Environmental law ,K3581-3598 - Abstract
Abstract This “Policy Brief” explores the potential integration of Aerosol Optical Depth (AOD) into the United Kingdom’s air quality and public health monitoring frameworks, highlighting its potential to enhance existing air pollution control strategies. Amid growing concerns over air pollution’s impact on health, particularly the link between particulate matter and lung cancer, this brief presents a focused investigation into how AOD can be leveraged alongside traditional monitoring methods to provide a more nuanced understanding of air quality trends. By correlating AOD data with lung cancer incidence rates within the UK, the brief aims to uncover potential associations and inform public health decisions. Furthermore, it discusses the advantages and limitations of employing AOD in air pollution and respiratory disease monitoring, advocating for a strategic enhancement of the UK's air pollution monitoring efforts. This approach seeks to complement and refine current monitoring practices with advanced remote sensing techniques, aiming to inform policy innovations that prioritize environmental health and public welfare. Through a comprehensive review of existing data and policies, the brief underscores the urgency of adopting multidimensional air quality management strategies that respond to technological advancements and emerging public health needs.
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- 2024
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7. The critical role of energy transition in addressing climate change at COP28
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Haoxuan Yu, Bodong Wen, Izni Zahidi, Ming Fai Chow, Dongfang Liang, and Dag Øivind Madsen
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Renewable energy ,Technological innovation ,Economic investment ,International cooperation ,Technology - Abstract
The paper outlines the urgency and strategies for transitioning from fossil fuels to renewable energy discussed at the 2023 Climate Change Conference (COP28). It emphasizes the Paris Agreement's role and highlights the environmental harm of fossil fuels, advocating for sustainable alternatives like solar, wind, hydro, and geothermal power. This transition is crucial for reducing greenhouse gas emissions and promoting economic and health benefits. Key findings reveal advancements in renewable technologies, resulting in job creation, energy independence, and improved health due to reduced pollution. However, the transition faces challenges such as high initial costs and the need for advanced infrastructure, particularly in developing countries. The paper underscores the importance of sustainable mining for essential materials like lithium and cobalt, and references António Guterres's “five-point energy plan” as a strategic approach to address these issues. In conclusion, the paper stresses the necessity of global collaboration among governments, businesses, and civil societies. It asserts that the path to sustainable energy is rich with opportunities for innovation, growth, and equitable progress, providing a comprehensive roadmap for a feasible and just energy transition for all nations.
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- 2024
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8. Constructing the future: Policy-driven digital fabrication in China's urban development
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Haoxuan Yu, Bodong Wen, Izni Zahidi, Chow Ming Fai, and Dag Øivind Madsen
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Digital fabrication ,Construction policy ,Sustainable construction ,Building revolution ,Concrete building ,Technology - Abstract
Digital fabrication technologies, such as 3D printing and CNC (Computer Numerical Control) machining, are spearheading a transformative shift in urban development across China. This movement is underpinned by robust governmental support and attractive financial incentives, which are pivotal in fostering innovation within the realms of construction and architectural design. The integration of these cutting-edge technologies is poised to redefine conventional construction methodologies, promising unprecedented levels of efficiency and precision. This evolution extends beyond mere construction efficiency; it is instrumental in the emergence of smart cities, enhancing urban services and infrastructures and advancing sustainability goals. The deployment of digital fabrication techniques signifies a pivotal moment in China's urbanization journey, ushering in a new epoch where the dynamics of urban construction and design are fundamentally altered. This paradigm shift is anticipated to have profound implications for the future of urban development, offering exciting opportunities for innovation and sustainability. With digital fabrication at the helm, China is navigating towards a future where urban environments are not only more efficiently constructed but are also more responsive to the evolving needs and aspirations of their inhabitants. The result is a promising horizon for urban development, where the fusion of technology, sustainability, and smart urban planning paves the way for cities that are not only more livable but also emblematic of future-forward thinking and environmental stewardship.
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- 2024
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9. Sungai Lembing’s green tourism: Pioneering the future of resource-based urban renewal
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Haoxuan Yu, Ginura Gunaratna, Izni Zahidi, and Chow Ming Fai
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Science (General) ,Q1-390 - Published
- 2024
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10. Harvesting the Sky: A new horizon in photocatalytic hydrogen production
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Haoxuan Yu, Izni Zahidi, Chow Ming Fai, Dongfang Liang, and Dag Øivind Madsen
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Atmospheric water harvesting ,Covalent organic frameworks (COFs) ,Photocatalytic hydrogen production ,Technology - Abstract
In a groundbreaking advance for sustainable energy, a recent study unveils a transformative approach to hydrogen production, signaling a major shift in renewable energy. This study integrates one-dimensional covalent organic frameworks (COFs) with the innovative concept of harvesting atmospheric water, marking a significant stride in the quest for cleaner energy sources. It stands as the first successful integration of Atmospheric Water Harvesting (AWH) with photocatalysis, as well as the inaugural application of COFs in the photocatalytic evolution of hydrogen from water vapor. It envisions a future where our atmosphere becomes a vital, untapped reservoir for clean energy, merging cutting-edge science with a profound commitment to environmental sustainability. This breakthrough challenges conventional energy paradigms and opens up exciting possibilities for a world striving towards ecological balance and energy innovation.
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- 2024
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11. Mineral waste recycling, sustainable chemical engineering, and circular economy
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Haoxuan Yu, Izni Zahidi, Chow Ming Fai, Dongfang Liang, and Dag Øivind Madsen
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Waste recycling ,Mineral waste ,Chemical engineering ,Environment management ,Circular economy ,Technology - Abstract
The mineral processing industry is pivotal in natural resource extraction and historically contributes to environmental damages like land degradation and groundwater contamination. In the face of resource scarcity and environmental pollution, sustainable solutions are increasingly vital. The circular economy focuses on reusing, recycling, and reducing waste, which turns unwanted by-products into valuable assets. Sustainable chemical processes offer innovative solutions in waste material reclamation and integration into the production chain. These practices not only mitigate waste but also enable resource recovery, turning waste management costs into profits. Repurposing mineral waste reduces mining's environmental impact, lessens new mining needs, and yields economic advantages.
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- 2024
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12. Correction: Direct Regeneration of Spent Lithium-Ion Battery Cathodes: From Theoretical Study to Production Practice
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Meiting Huang, Mei Wang, Liming Yang, Zhihao Wang, Haoxuan Yu, Kechun Chen, Fei Han, Liang Chen, Chenxi Xu, Lihua Wang, Penghui Shao, and Xubiao Luo
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Technology - Published
- 2024
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13. Sustainable porous-insulation concrete (SPIC) material: recycling aggregates from mine solid waste, white waste and construction waste
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Haoxuan Yu, Izni Zahidi, and Dongfang Liang
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Environmental management ,Sustainable materials ,Composite materials ,Waste recycle ,Mining engineering. Metallurgy ,TN1-997 - Abstract
This study developed a sustainable concrete material called Sustainable Porous-Insulation Concrete (SPIC), using mine solid waste (tailings), construction waste (waste perlite particles), and white waste (EPS granules) as aggregates. Through thermal conductivity and compression strength experiments, micro-structure analysis, and toxic leaching experiments, it was found that SPIC has both excellent thermal insulation and good strength, making it a cost-effective and eco-friendly material. Potential applications of SPIC include thermal (acoustic) walls in buildings, insulated road foundations in permafrost areas, and backfill mining. Noteworthy, in the discussion section, we addressed the potential environmental impact of mine solid waste and highlighted the importance of its reuse. To facilitate the reuse of mine solid waste, we proposed a classification framework for mine solid waste based on the United Nations Framework Classification (UNFC). This framework provides a standardized approach for classifying mine solid waste based on its potential for reuse, which can help to promote sustainable and responsible resource management in the mining industry.
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- 2023
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14. Bubbles Management for Enhanced Catalytic Water Splitting Performance
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Zheng Zhang, Chen Gu, Kun Wang, Haoxuan Yu, Jiaxuan Qiu, Shiyan Wang, Longlu Wang, and Dafeng Yan
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water splitting ,high current densities ,improving catalytic performance ,modifying electrode-surface characteristics ,bubble management ,Chemical technology ,TP1-1185 ,Chemistry ,QD1-999 - Abstract
Water splitting is widely acknowledged as an efficient method for hydrogen production. In recent years, significant research efforts have been directed towards developing cost-effective electrocatalysts. However, the management of bubbles formed on the electrode surface during electrolysis has been largely overlooked. These bubbles can impede the active sites, resulting in decreased catalytic performance and stability, especially at high current densities. Consequently, this impediment affects the energy conversion efficiency of water splitting. To address these challenges, this review offers a comprehensive overview of advanced strategies aimed at improving catalytic performance and mitigating the obstructive effects of bubbles in water splitting. These strategies primarily involve the utilization of experimental apparatus to observe bubble-growth behavior, encompassing nucleation, growth, and detachment stages. Moreover, the review examines factors influencing bubble formation, considering both mechanical behaviors and internal factors. Additionally, the design of efficient water-splitting catalysts is discussed, focusing on modifying electrode-surface characteristics. Finally, the review concludes by summarizing the potential of bubble management in large-scale industrial hydrogen production and identifying future directions for achieving efficient hydrogen production.
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- 2024
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15. Vegetation as an ecological indicator in assessing environmental restoration in mining areas
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Haoxuan Yu, Izni Zahidi, and Ming Fai Chow
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Natural sciences ,Earth sciences ,Environmental science ,Ecology ,Science - Abstract
Summary: As global demand for natural resources escalates, the environmental impact stemming from resource extraction has risen to the forefront of contemporary discussions. This paper probed the potential of using vegetation cover as an ecological barometer to gauge the level of environmental damage and restoration in mining areas: a decline in vegetation cover may signify detrimental impacts from intense mining activities, while an increase may indicate effective local environmental stewardship. Therefore, this paper undertook an assessment and discussion of mining damage and environmental management at China’s Ta’ershan Mining Area since 2007, calculating and visualizing FVC (Fractional Vegetation Cover) of the Ta’ershan Mining Area to track changes in vegetation cover between 2007 and 2021. Changes in vegetation cover in the Ta’ershan Mining Area could act as a reflection of both mining-induced damage and subsequent successful environmental management by local authorities, providing a practical way to evaluate ecological effects in resource development.
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- 2023
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16. The Advanced Progress of MoS2 and WS2 for Multi-Catalytic Hydrogen Evolution Reaction Systems
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Haoxuan Yu, Mengyang Zhang, Yuntao Cai, Yanling Zhuang, and Longlu Wang
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two-dimensional transition-metal dichalcogenides ,structural engineering ,co-catalyst ,EY/TEOA system ,hydrogen evolution reaction ,Chemical technology ,TP1-1185 ,Chemistry ,QD1-999 - Abstract
Two-dimensional transition-metal dichalcogenides (TMDs) are considered as the next generation of hydrogen evolution electrocatalysts due to their adjustable band gap, near-zero Gibbs free energy, and lower cost compared to noble metal catalysts. However, the electrochemical catalytic hydrogen evolution performance of TMDs with two-dimensional properties is limited by innate sparse catalytic active sites, poor electrical conductivity, and weak electrical contact with the substrate. It remains challenging for the intrinsic activity of TMDs for electrocatalytic and photocatalytic hydrogen evolution reactions (HERs) to compete with the noble metal platinum. In recent years, significant development of transition metal chalcogenides, especially MoS2 and WS2, as catalysts for electrocatalytic and photocatalytic HERs has proceeded drastically. It is indispensable to summarize the research progress in this area. This review summarizes recent research results of electrocatalysts and photocatalysts for hydrogen evolution reactions based on two-dimensional materials, mainly including MoS2, WS2, and their compounds. The challenges and future development directions of two-dimensional hydrogen evolution reaction electrocatalysts and photocatalysts are summarized and prospected as well.
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- 2023
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17. Advantages of Backfill Mining Method for Small and Medium-Sized Mines in China: Safe, Eco-Friendly, and Efficient Mining
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Shuai Li, Peiyuan Zou, Haoxuan Yu, Boyi Hu, and Xinmin Wang
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environment ,green mining ,mining transformation ,mining engineering ,tailings utilization ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Despite China’s position as a global mining powerhouse, tens of thousands of small- and medium-sized mines (SM mines) within the country continue to pose potential safety hazards and environmental pollution risks. Only through the identification of suitable development paths can these mines improve their economic and environmental benefits, ultimately driving significant progress in China’s mining industry. Backfill mining, an environmentally friendly mining method, has emerged as a viable solution, offering the potential to ensure mining safety, reduce environmental pollution stemming from tailings stockpiles, and enhance ore resource recovery. This review article aims to provide researchers and readers with a comprehensive understanding of the current situation and challenges faced by SM mines in China. It explores the mining processes, technologies, and equipment commonly employed by these mines while addressing the specific problems and challenges they encounter. Furthermore, the article offers recommendations to guide the future development of SM mines. Additionally, the review examines the prospects and potential applications of backfill mining methods within the context of SM mines in China, emphasizing their role in promoting sustainable mining practices, environmental protection, and waste utilization. Ultimately, this comprehensive review article serves as a valuable resource, stimulating discourse and encouraging experts and scholars to further explore the unique challenges and opportunities associated with SM mines. By highlighting the significance of green mining practices, environmental protection, backfill mining, and waste utilization, the article aims to inspire innovative solutions and foster sustainable practices within the Chinese mining industry.
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- 2023
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18. Tailings Pond Classification Based on Satellite Images and Machine Learning: An Exploration of Microsoft ML.Net
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Haoxuan Yu and Izni Zahidi
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mine geology ,computational intelligence ,remote sensing ,environment management ,Mathematics ,QA1-939 - Abstract
Mine pollution from mining activities is often widely recognised as a serious threat to public health, with mine solid waste causing problems such as tailings pond accumulation, which is considered the biggest hidden danger. The construction of tailings ponds not only causes land occupation and vegetation damage but also brings about potential environmental pollution, such as water and dust pollution, posing a health risk to nearby residents. If remote sensing images and machine learning techniques could be used to determine whether a tailings pond might have potential pollution and safety hazards, mainly monitoring tailings ponds that may have potential hazards, it would save a lot of effort in tailings ponds monitoring. Therefore, based on this background, this paper proposes to classify tailings ponds into two categories according to whether they are potentially risky or generally safe and to classify tailings ponds with remote sensing satellite images of tailings ponds using the DDN + ResNet-50 machine learning model based on ML.Net developed by Microsoft. In the discussion section, the paper introduces the environmental hazards of mine pollution and proposes the concept of “Healthy Mine” to provide development directions for mining companies and solutions to mine pollution and public health crises. Finally, we claim this paper serves as a guide to begin a conversation and to encourage experts, researchers and scholars to engage in the research field of mine solid waste pollution monitoring, assessment and treatment.
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- 2023
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19. Effect of Flocculants Residue on Rheological Properties of Ultra-Fine Argillaceous Backfilling Slurry
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Shuai Li, Zheng Yu, Boyi Hu, Haoxuan Yu, and Xinmin Wang
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ultra-fine argillaceous backfilling slurry ,rheological properties ,flocculation residue ,slurry pipeline transportation ,flocculant network structure ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
Tailings concentration is indispensable for backfilling. Additionally, the residual flocculants in the concentration process affect the rheological properties of ultra-fine argillaceous backfilling slurry (e.g., viscosity and yield stress), resulting in a great effect on the fluidity and resistance of pipeline transportation. In this study, to explore the effect of flocculants residue on the rheological properties of the slurry, a series of rheological tests (constant shear rate test and variable shear rate test) were performed by changing the type, dosage, stirring time, temperature of flocculants addition and the amount of binder added. The results showed that the addition of flocculants increased the viscosity and yield stress of slurry. At a certain amount of flocculants additive, the flocculant network structure reached the best development state, which had a positive effect on increasing slurry viscosity and yield stress. As the stirring time increased, the scale of damage to the flocculant network structure became larger, which had a negative effect on increasing slurry viscosity and yield stress. Low temperature weakened the adsorption and bridging effect of polymeric chains, resulting in a poorly developed flocculant network structure, which had a negative effect on increasing slurry viscosity and yield stress. Caused by hydration products, the viscosity and yield stress of slurry with binder further increased. This study is significant for an in-depth study of the rheological and pipeline transport characteristics of ultra-fine argillaceous backfilling slurry, optimising the selection of flocculants for ultrafine particles, guiding backfill parameters and improving the reliability of pipeline transport.
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- 2022
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20. Sulfur Line Vacancies in MoS2 for Catalytic Hydrogen Evolution Reaction
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Meng Tang, Weinan Yin, Shijie Liu, Haoxuan Yu, Yuhao He, Yuntao Cai, and Longlu Wang
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sulfur line vacancies in MoS2 ,atomic structure ,MoS2 ,hydrogen evolution reaction ,Crystallography ,QD901-999 - Abstract
Defects in transition metal dichalcogenides play important roles in the field of the catalytic hydrogen evolution reaction (HER). However, the use of defective MoS2 as HER catalysts remains controversial because the types of defects are various, including zero-dimensional point defects, one-dimensional linear defects, and two-dimensional plane defects. Recently, novel structures of linear defects have drawn more and more attention, and it is necessary to explore their unique properties. This review focuses on the formation mechanism, fabrication method, accurate atomic structure, and catalytic hydrogen evolution mechanism of sulfur line vacancies in MoS2 as electrocatalysts. The structure–activity relationship between line defects and catalytic performance is discussed in detail. This will provide a route for the design of excellent catalysts by engineering line defects.
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- 2022
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21. The Recent Progress China Has Made in the Backfill Mining Method, Part III: Practical Engineering Problems in Stope and Goaf Backfill
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Haoxuan Yu, Shuai Li, and Xinmin Wang
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mining engineering ,stope and goaf backfill ,Mineralogy ,QE351-399.2 - Abstract
With the continuous innovation and development of science and technology, the mining industry has also benefited greatly and improved over time, especially in the field of backfill mining. Mining researchers are increasingly working on cutting-edge technologies, such as applying artificial intelligence to mining production. However, in addition, some problems in the actual engineering are worth people’s attention, and especially in China, such a big mining country, the actual engineering faces many problems. In recent years, Chinese mining researchers have conducted a lot of studies on practical engineering problems in the stope and goaf of backfill mining method in China, among which the three most important points are (1) Calculation problems of backfill slurry transportation; (2) Reliability analysis of backfill pipeline system; (3) Stope backfill process and technology. Therefore, this final part (Part III) will launch the research progress of China’s practical engineering problems from the above two points. Finally, we claim that Part III serves just as a guide to starting a conversation, and hope that many more experts and scholars will be interested and engage in the research of this field.
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- 2022
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22. Application of Numerical Simulation Methods in Solving Complex Mining Engineering Problems in Dingxi Mine, China
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Boyi Hu, Qinli Zhang, Shuai Li, Haoxuan Yu, Xinmin Wang, and Hao Wang
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numerical simulation ,underground mining ,backfill mining method ,high and steep slope ,Mineralogy ,QE351-399.2 - Abstract
In the mining industry, with numerical simulation analysis of stope roof stability, stope exposed area computation, and pillar buckling collapse simulation, backfill body creep damage mechanism research is becoming the most popular method in the field of backfill mining techniques. In this paper, we first summarized and analyzed the current application status and the existing problems of numerical simulation for solving mining engineering technical problems; then, based on the practical engineering problems of mining phosphate rock resources under high and steep rock slopes (HSRS), we carried out a true-3D numerical simulation study for different underground mining methods, to determine the appropriate mining method. Therefore, this paper, taking Dingxi Mine in China as an example, highlights the advantages of the backfill mining method with a high and steep slope; meanwhile, it also points out how to improve the accuracy of a numerical simulation and make it more consistent with the actual situation of the mining engineering application site. This paper only serves as a guide, in order to start a conversation, and we hope many more experts and scholars will become interested and engaged in this field of research.
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- 2022
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23. The Recent Progress China Has Made in the Backfill Mining Method, Part II: The Composition and Typical Examples of Backfill Systems
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Shuai Li, Zeming Zhao, Haoxuan Yu, and Xinmin Wang
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backfill mining method ,backfill systems ,typical application examples ,Mineralogy ,QE351-399.2 - Abstract
The backfill mining method is a widely used mining method in the major mines of China, which can maximize the recovery of mineral resources and protect the environment. Currently, major mines in China are starting to build backfill systems to apply the backfill mining method, therefore, Part II reviews the progress China has made on creating backfill systems, of which the main contents include: (1) Composition of the backfill system common in Chinese mines; (2) Typical examples of the backfill system in China. Finally, Part II serves as a guide to begin a conversation, and to encourage experts and scholars to engage in the research of this field.
- Published
- 2021
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24. The Recent Progress China Has Made in the Backfill Mining Method, Part I: The Theory and Equipment of Backfill Pipeline Transportation
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Haoxuan Yu, Shuai Li, and Xinmin Wang
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mining engineering ,green mining ,backfill ,Mineralogy ,QE351-399.2 - Abstract
The backfill mining method is one of the common methods of mine mining worldwide, due to its capacity to maximize the recovery of mineral resources and protect the underground and the surface environment. Similar to the developing conditions of China’s mining industry, China’s backfill mining technology started late, and the level of its equipment is weak, but its development is particularly rapid. Especially after entering the 21st century, China has paid more attention to mining safety, environmental protection, and the continuous implementation of resources development, China’s backfill mining method has increasingly improved, and the level of filling equipment has gradually reached the most advanced level worldwide, which means China has been making great progress in the equipment of backfill mining method, and in recent years, China has also made great progress in the theory of backfill pipeline transportation. Therefore, Part I mainly focuses on both the theory and equipment of backfill pipeline transportation and the recent progress China has made in is introduced in two sections as follows: (1) the theory of backfill pipeline transportation and (2) the equipment of the backfill mining method. Finally, the authors claim that this paper serves just as a guide, tossing out a brick to get a jade gem, and we hope many more experts and scholars will be interested and engage in the research of this field.
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- 2021
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25. Pre-Work for the Birth of Driver-Less Scraper (LHD) in the Underground Mine: The Path Tracking Control Based on an LQR Controller and Algorithms Comparison
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Haoxuan Yu, Chenxi Zhao, Shuai Li, Zijian Wang, and Yulin Zhang
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scraper (LHD) ,artificial intelligence ,path tracking ,mining engineering ,Chemical technology ,TP1-1185 - Abstract
With the depletion of surface resources, mining will develop toward the deep surface in the future, the objective conditions such as the mining environment will be more complex and dangerous than now, and the requirements for personnel and equipment will be higher and higher. The efficient mining of deep space is inseparable from movable and flexible production and transportation equipment such as scrapers. In the new era, intelligence is leading to the development trend of scraper (LHD), path tracking control is the key to the intelligent scraper (LHD), and it is also an urgent problem to be solved for unmanned driving. This paper describes the realization of the automatic operation of articulating the scraper (LHD) from two aspects, a mathematical model and trajectory tracking control method, and it focuses on the research of the path tracking control scheme in the field of unmanned driving, that is, an LQR controller. On this basis, combined with different intelligent clustering algorithms, the parameters of the LQR controller are optimized to find the optimal solution of the LQR controller. Then, the path tracking control of an intelligent LHD unmanned driving technology is studied, focusing on the optimization of linear quadratic optimal control (LQR) and the intelligent cluster algorithms AGA, QPSO, and ACA; this research has great significance for the development of the intelligent scraper (LHD). As mining engineers, we not only need to conduct research for practical engineering projects but also need to produce theoretical designs for advanced mining technology; therefore, the area of intelligent mining is the one we need to explore at present and in the future. Finally, this paper serves as a guide to starting a conversation, and it has implications for the development and the future of underground transportation.
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- 2021
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26. Missile: Fine-Grained, Hardware-Level GPU Resource Isolation for Multi-Tenant DNN Inference.
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Yongkang Zhang, Haoxuan Yu, Chenxia Han, Cheng Wang, Baotong Lu, Yang Li, Xiaowen Chu, and Huaicheng Li
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- 2024
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27. FaaSwap: SLO-Aware, GPU-Efficient Serverless Inference via Model Swapping.
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Minchen Yu, Ao Wang, Dong Chen, Haoxuan Yu, Xiaonan Luo, Zhuohao Li, Wei Wang 0030, Ruichuan Chen, Dapeng Nie, and Haoran Yang
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- 2023
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28. Directly upgrading spent graphite anodes to stable CuO/C anodes by utilizing inherent Cu impurities from spent lithium-ion batteries.
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Kechun Chen, Haoxuan Yu, Meiting Huang, Zhihao Wang, Yifeng Li, Lei Zhou, Liming Yang, Yufa Feng, Liang Chen, Lihua Wang, Longlu Wang, Chenxi Xu, Penghui Shao, and Xubiao Luo
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COPPER , *LITHIUM-ion batteries , *ANODES , *COPPER oxide , *GRAPHITE - Abstract
Reusing spent anodes is a pivotal step for recycling lithium-ion batteries (LIBs). However, it proves challenging to completely eliminate Cu impurities from spent graphite (SG), which hinders the effective recycling of spent anodes. In this paper, a straightforward air oxidation method is proposed to directly upgrade spent anodes into stable CuO/C anodes by harnessing the inherent Cu impurities in spent anodes. The air oxidation process not only repairs the SG to some extent but also generates uniformly dispersed CuO nanoparticles, which chemically bind with the repaired graphite (RG) through Cu–O–C bonds. The specific discharge capacity of the CuO/RG anode can reach as high as 647 mA h g−1 even after 500 cycles (at 372 mA g−1 ). In addition, this program is found to reduce energy consumption and greenhouse gas emissions by ∼80% compared to previously reported CuO/C production programs. Clearly, this approach provides a new direction for large-scale recycling of spent LIBs and low-cost production of high-performance CuO/C anodes. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
29. Spatiotemporal variation of vegetation cover in mining areas of Dexing City, China
- Author
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Haoxuan Yu, Izni Zahidi, Dongfang Liang, Liang, Dongfang [0000-0001-5639-7375], and Apollo - University of Cambridge Repository
- Subjects
China ,Environmental management ,Mining damage ,Mining engineering ,Remote sensing ,Cities ,Solid Waste ,Biochemistry ,Copper ,General Environmental Science ,Environmental Monitoring - Abstract
Dexing City is an important mining city in China, abounding in copper ore, lead ore, zinc ore, and other metal resources, and there are two large open-pit mines in its territory, Dexing Copper Mine and Yinshan Mine. The two open-pit mines have been expanding their mining production scale since 2005, with frequent mining activities; and the expansion of the pits and the discharge of solid waste will undoubtedly increase the land use and cause the destruction of vegetation. Therefore, we plan to visualize the change in vegetation cover in Dexing City from 2005 to 2020 and the expansion of the two open-pit mines by calculating changes of the Fractional Vegetation Cover (FVC) in the mining area using remote sensing technology. In this study, we calculated the FVC of Dexing City in 2005, 2010, 2015 and 2020 using data from NASA Landsat Database via ENVI image analysis software, plotted the FVC reclassified maps via ArcGIS, and conducted field investigations in the mining areas of Dexing City. In this way, we can visualize the spatial and temporal changes of vegetation cover in Dexing City from 2005 to 2020, and appreciate the situation of mining expansion and its solid waste discharge in Dexing City. The results of this study showed that the vegetation cover of Dexing City remained stable from 2005 to 2020, as the expansion of mining scale and mine pits was accompanied by active environmental management and land reclamation, setting a positive example for other mining cities.
- Published
- 2023
30. Environmental hazards posed by mine dust, and monitoring method of mine dust pollution using remote sensing technologies: An overview
- Author
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Haoxuan Yu and Izni Zahidi
- Subjects
Environmental Engineering ,Environmental Chemistry ,Pollution ,Waste Management and Disposal - Abstract
The over-exploitation of mineral resources has led to increasingly serious dust pollution in mines, resulting in a series of negative impacts on the environment, mine workers (occupational health) and nearby residents (public health). For the environment, mine dust pollution is considered a major threat on surface vegetation, landscapes, weather conditions and air quality, leading to serious environmental damage such as vegetation reduction and air pollution; for occupational health, mine dust from the mining process is also regarded as a major threat to mine workers' health, leading to occupational diseases such as pneumoconiosis and silicosis; for public health, the pollutants contained in mine dust may pollute surrounding rivers, farmlands and crops, which poses a serious risk to the domestic water and food security of nearby residents who are also susceptible to respiratory diseases from exposure to mine dust. Therefore, the second section of this paper combines literature research, statistical studies, and meta analysis to introduce the public mainly to the severity of mine dust pollution and its hazards to the environment, mine workers (occupational health), and residents (public health), as well as to present an outlook on the management of mine dust pollution. At the same time, in order to propose a method for monitoring mine dust pollution on a regional scale, based on the Dense Dark Vegetation (DDV) algorithm, the third section of this paper analysed the aerosol optical depth (AOD) change in Dexing City of China using the data of 2010, 2014, 2018 and 2021 from the NASA MCD19A2 Dataset to explore the mine dust pollution situation and the progress of pollution treatment in Dexing City from 2010 to 2021. As a discussion article, this paper aims to review the environmental and health risks caused by mine dust pollution, to remind the public to take mine dust pollution seriously, and to propose the use of remote sensing technologies to monitor mine dust pollution, providing suggestions for local governments as well as mines on mine dust monitoring measures.
- Published
- 2022
31. Mining waste: curb risks to people and the environment
- Author
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Haoxuan Yu
- Subjects
Multidisciplinary - Published
- 2023
32. Study on fatigue fracture of SW400 fine-grained high-strength steel T-lap joint
- Author
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Ge Jin, Yujing Chen, Guoshan Song, Qiuyue Fan, Haoxuan Yu, Guocheng Xu, and Desheng Xu
- Subjects
History ,Computer Science Applications ,Education - Abstract
The SW400 fine-grained high-strength steel T-lap joints were welded by submerged arc welding. The influence of welding technology on the geometrical characteristics of welds and fatigue performance of the joints were studied by radial fatigue test with different welding parameters. The numerical analysis was used to study the characteristics of the stress distribution. And the fatigue fracture morphology was analyzed by scanning electron microscope. The results show that with the increase of welding line energy, the thickness of the weld increased, and the propagation direction of the fatigue crack changed from the weld to the base metal. When the thickness was less than 4 mm, the high-stress region was in the area of the weld around the weld root, and the fatigue crack propagated to the weld. When the thickness was greater than 4.5 mm, the high-stress region of AE and AS were in the weld around the root, where the crack propagated to the weld, while in the middle of the weld high-stress region was in the area of base metal around the weld root, crack propagated to the base metal. With the increase in the thickness of the weld, the maximum mises stress decreased, and the crack propagation rate decreased. The time of crack initiation was very short, which occurred in the high-stress region of the weld root in the middle of the weld.
- Published
- 2023
33. Mining Method Optimization of Difficult-to-Mine Complicated Orebody Using Pythagorean Fuzzy Sets and TOPSIS Method
- Author
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Shuai Li, Qi Huang, Boyi Hu, Jilong Pan, Junyu Chen, Jianguo Yang, Xinghui Zhou, Xinmin Wang, and Haoxuan Yu
- Subjects
Renewable Energy, Sustainability and the Environment ,difficult-to-mine complicated orebody ,mechanized upward horizontal layering method ,Geography, Planning and Development ,mining method optimization ,Building and Construction ,multiple attribute decision making ,Management, Monitoring, Policy and Law ,Pythagorean fuzzy sets and TOPSIS method - Abstract
In Suichang gold mine, the altered rock type gold deposits were cut by faults and joint fissures, leading to complex resource endowment characteristics, large changes in occurrence, a serious complex of ore vein branches and great difficulty in mining. In order to select a suitable mining method for such a difficult and complicated orebody, a multi-factor and multi-index comprehensive evaluation system involving benefits, costs, safety and other aspects was constructed by using the Pythagorean fuzzy sets and TOPSIS method. Taking Suichang gold mine as an example, the weighted aggregation evaluation matrix was constructed, the closeness index of the four mining schemes were 0.8436, 0.3370, 0.4296 and 0.4334, and the mechanized upward horizontal layering method was determined as the optimal scheme. This method overcame the fuzzy comparison of economic and technical indicators directly, but converted them into corresponding fuzzy numbers to obtain accurate closeness index for optimization. The application of this method not only ensured a safe, efficient and environment-friendly mining effect, but also provided a reference for the optimization of the mining scheme of the severely branched composite orebody.
- Published
- 2023
34. The Recent Progress China Has Made in Green Mine Construction, Part I: Mining Groundwater Pollution and Sustainable Mining
- Author
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Shuai Li, Lifeng Yu, Wanjun Jiang, Haoxuan Yu, and Xinmin Wang
- Subjects
China ,Health, Toxicology and Mutagenesis ,Public Health, Environmental and Occupational Health ,Humans ,Environmental Pollutants ,green mining ,environment protection ,sustainability ,Environmental Pollution ,Groundwater ,Mining ,Water Pollutants, Chemical ,Environmental Monitoring - Abstract
With the development of technology, the concepts of “green” and “sustainable” have gradually been popularized in all walks of life. With the continuous development of the world mining industry, the efficiency of resource development in various countries has been improved, but mining activities and production will undoubtedly bring many environmental pollution problems. As a mining power, China is one of the first countries to put forward the concept of “green mining”. Over the years, as people emphasize safety and environmental protection, green mining technology has become the hot topic. At the same time, groundwater pollution caused by mining has become the focus of China’s “green mine construction”: with the continuous development of mining, mining activities and production will also undoubtedly bring significant environmental pollution. The environmental pollution of the mined area has a vital influence on the surrounding environment. The pollutants mainly come from mining operations and production of the mineral processing industry, including process wastewater, gas waste, smelting slag, etc., which are all acidic. Acid mine drainage (AMD) occurs in the process of mining production, due to the structure of minerals and the complex reactions between oxygen and minerals, and results in heavy metal ions leaching into groundwater. Once the groundwater is polluted, it will slowly flow to the surrounding area, resulting in the migration and diffusion of pollutants in the groundwater, affecting the surrounding rivers, farmland, and drinking water for residents. In recent years, environmental damage caused by groundwater pollution from underground mines in Shijiazhuang, China, and Selangor, Malaysia, has had a negative impact on rivers, farmland, and human health. At the same time, the paper introduces many key technologies of green mine construction, such as the backfill mining method. In cooperation with China Road & Bridge Corporation, this paper also introduces the progress in the reuse of mining waste, especially the use of mining waste as aggregate to prepare concrete materials for road and bridge construction. This information article introduces the development status of green mine construction in China and briefly reviews the key technologies of green mine construction in China.
- Published
- 2022
35. Coastal mining and its dynamics impacts on the estuary and coastal environments in Hainan Changjiang Coast
- Author
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Haoxuan Yu
- Published
- 2022
- Full Text
- View/download PDF
36. The Recent Progress China Has Made in the Backfill Mining Method, Part II: The Composition and Typical Examples of Backfill Systems
- Author
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Haoxuan Yu, Shuai Li, Xinmin Wang, and Zeming Zhao
- Subjects
Engineering ,business.industry ,backfill mining method ,InformationSystems_DATABASEMANAGEMENT ,Geology ,ComputingMilieux_LEGALASPECTSOFCOMPUTING ,typical application examples ,Geotechnical Engineering and Engineering Geology ,Mineralogy ,Mineral resource classification ,Field (computer science) ,ComputingMilieux_GENERAL ,Mining engineering ,backfill systems ,China ,business ,Composition (language) ,QE351-399.2 - Abstract
The backfill mining method is a widely used mining method in the major mines of China, which can maximize the recovery of mineral resources and protect the environment. Currently, major mines in China are starting to build backfill systems to apply the backfill mining method, therefore, Part II reviews the progress China has made on creating backfill systems, of which the main contents include: (1) Composition of the backfill system common in Chinese mines; (2) Typical examples of the backfill system in China. Finally, Part II serves as a guide to begin a conversation, and to encourage experts and scholars to engage in the research of this field.
- Published
- 2021
- Full Text
- View/download PDF
37. The Recent Progress China Has Made in the Backfill Mining Method, Part I: The Theory and Equipment of Backfill Pipeline Transportation
- Author
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Shuai Li, Haoxuan Yu, and Xinmin Wang
- Subjects
Brick ,Engineering ,business.industry ,Geology ,Mineralogy ,Geotechnical Engineering and Engineering Geology ,mining engineering ,Construction engineering ,Pipeline transport ,Mining industry ,green mining ,backfill ,China ,business ,QE351-399.2 - Abstract
The backfill mining method is one of the common methods of mine mining worldwide, due to its capacity to maximize the recovery of mineral resources and protect the underground and the surface environment. Similar to the developing conditions of China’s mining industry, China’s backfill mining technology started late, and the level of its equipment is weak, but its development is particularly rapid. Especially after entering the 21st century, China has paid more attention to mining safety, environmental protection, and the continuous implementation of resources development, China’s backfill mining method has increasingly improved, and the level of filling equipment has gradually reached the most advanced level worldwide, which means China has been making great progress in the equipment of backfill mining method, and in recent years, China has also made great progress in the theory of backfill pipeline transportation. Therefore, Part I mainly focuses on both the theory and equipment of backfill pipeline transportation and the recent progress China has made in is introduced in two sections as follows: (1) the theory of backfill pipeline transportation and (2) the equipment of the backfill mining method. Finally, the authors claim that this paper serves just as a guide, tossing out a brick to get a jade gem, and we hope many more experts and scholars will be interested and engage in the research of this field.
- Published
- 2021
- Full Text
- View/download PDF
38. Pre-Work for the Birth of Driver-Less Scraper (LHD) in the Underground Mine: The Path Tracking Control Based on an LQR Controller and Algorithms Comparison
- Author
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Shuai Li, Zijian Wang, Yulin Zhang, Chenxi Zhao, and Haoxuan Yu
- Subjects
Scheme (programming language) ,scraper (LHD) ,artificial intelligence ,path tracking ,mining engineering ,Computer science ,Chemical technology ,NASA Deep Space Network ,TP1-1185 ,Biochemistry ,Atomic and Molecular Physics, and Optics ,Field (computer science) ,Article ,Analytical Chemistry ,Scraper site ,Control theory ,Key (cryptography) ,Trajectory ,Electrical and Electronic Engineering ,Cluster analysis ,Instrumentation ,Algorithm ,computer ,computer.programming_language - Abstract
With the depletion of surface resources, mining will develop toward the deep surface in the future, the objective conditions such as the mining environment will be more complex and dangerous than now, and the requirements for personnel and equipment will be higher and higher. The efficient mining of deep space is inseparable from movable and flexible production and transportation equipment such as scrapers. In the new era, intelligence is leading to the development trend of scraper (LHD), path tracking control is the key to the intelligent scraper (LHD), and it is also an urgent problem to be solved for unmanned driving. This paper describes the realization of the automatic operation of articulating the scraper (LHD) from two aspects, a mathematical model and trajectory tracking control method, and it focuses on the research of the path tracking control scheme in the field of unmanned driving, that is, an LQR controller. On this basis, combined with different intelligent clustering algorithms, the parameters of the LQR controller are optimized to find the optimal solution of the LQR controller. Then, the path tracking control of an intelligent LHD unmanned driving technology is studied, focusing on the optimization of linear quadratic optimal control (LQR) and the intelligent cluster algorithms AGA, QPSO, and ACA; this research has great significance for the development of the intelligent scraper (LHD). As mining engineers, we not only need to conduct research for practical engineering projects but also need to produce theoretical designs for advanced mining technology; therefore, the area of intelligent mining is the one we need to explore at present and in the future. Finally, this paper serves as a guide to starting a conversation, and it has implications for the development and the future of underground transportation.
- Published
- 2021
39. The New Safety Trends: The Challenges through Industry 4.0
- Author
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Mario, Di Nardo, primary, Piotr, Borowski, additional, Gallab, Maryam, additional, Teresa, Murino, additional, and Haoxuan, Yu, additional
- Published
- 2022
- Full Text
- View/download PDF
40. The Recent Progress China Has Made in Green Mine Construction, Part II: Typical Examples of Green Mines
- Author
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Haoxuan Yu, Shuai Li, Lifeng Yu, and Xinmin Wang
- Subjects
China ,Coal ,green mining ,sustainability ,environment ,intelligent technology ,Health, Toxicology and Mutagenesis ,Public Health, Environmental and Occupational Health ,Environmental Pollution ,Coal Mining ,Mining - Abstract
This paper (Part II), right after the Part I, also as an information article, introduces the recent progress of “green mine construction” in China. China is a big country in resource exploitation, but there are serious problems such as hidden danger, environmental pollution and resource waste in the exploitation of mineral resources in China. Therefore, the promotion of “green” mining technology, the implementation of “green mine construction” and the promotion of small- and medium-sized mines to green non-waste mining mode transformation and upgrading are crucial measures on the road of China’s mining development, with very important practical significance. Therefore, this information paper of our Chinese mining research mainly reviews the key progress in the construction and development of green mines and introduces four typical green mine examples in China: (1) the mine with the best green environment in China: Jinhui Mining Co., Ltd., Jiuquan, Gansu Province; (2) the most advanced mine in China: Jinchuan Group Company, Jinchang, Gansu Province; (3) the oldest green mine in China: the Suichang gold mine, Lishui, Zhejiang Province; and (4) the most mechanized mine in China: the Pingshuo Coal Co., Ltd., Shuozhou, Shanxi Province. In the abstract, we claim that Part II serves as a guide to begin a conversation and to encourage experts and scholars to engage in the research of this field.
- Published
- 2022
41. The Recent Progress China Has Made in High-Concentration Backfill
- Author
-
Shuai Li, Zheng Yu, Haoxuan Yu, and Xinmin Wang
- Subjects
Renewable Energy, Sustainability and the Environment ,mining engineering ,backfill mining ,high-concentration backfill ,Geography, Planning and Development ,Management, Monitoring, Policy and Law - Abstract
With the development of science and technology, backfill technology has made continuous progress, and the traditional backfill method is no longer suitable for various complicated practical engineering situations. Therefore, researchers in the field of backfill mining have gradually shifted their research focus to the study of high-concentration backfill, and Chinese researchers are no exception. In order to solve the problems caused by the traditional backfill method, China began to vigorously develop high-concentration backfill in recent years, and achieved a lot of results. In this paper, some important achievements made by Chinese researchers on high-concentration backfill in recent years are reviewed; it also presents a summary report of the latest research results from several key laboratories across China. Therefore, this paper reviews the development progress of high-concentration backfill China has made, of which the main contents include: (1) research progress of the high-concentration backfill theory in China; and (2) research progress of high-concentration backfill equipment in China. Finally, we claim that this paper serves just as a guide to start a conversation, and we hope many more experts and scholars will be interested and engage in the research of this field.
- Published
- 2022
42. Effects of UIT on Microstructure and Properties of 441 Ferritic Stainless Steel Laser Welded Joint
- Author
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Caiyu Zhao, Qiuyue Fan, Haoxuan Yu, Hao Wang, and Desheng Xu
- Subjects
History ,Computer Science Applications ,Education - Abstract
Effects of UIT (Ultrasonic impact treatment) on the microstructure and properties of laser welded 1.5mm 441 ferritic stainless steel sheets were studied. Results indicate that the surface of the butt joint generated an ultrasonically induced strengthening layer after UIT. The average microhardness of the layer was increased by 18.1%. The tensile strength of the specimens was increased. Moreover, UIT can decrease the residual stress of welded specimens, the maximum longitudinal tensile stress in the central area was decreased by 78.4%, and the transverse residual stress was converted into compressive stress. The cupping value was increased from 34.5 mm to 37.0 mm following UIT. In addition, the fracture position was changed from the central weld to the edge weld of the cupping hemisphere. The mechanical properties were increased due to the generation of strengthening layers and the decrease of residual stress by UIT.
- Published
- 2022
43. A Novel Stacked Long Short-Term Memory Approach of Deep Learning for Streamflow Simulation
- Author
-
Haoxuan Yu, Vahid Shokri, Hadi Galavi, Adnan Dehghani, Sahar Mohsenzadeh Karimi, Majid Mirzaei, and Mehdi Sookhak
- Subjects
Soil and Water Assessment Tool ,Stochastic modelling ,Computer science ,Hydrological modelling ,Geography, Planning and Development ,TJ807-830 ,SLSTM ,Context (language use) ,Management, Monitoring, Policy and Law ,TD194-195 ,computer.software_genre ,Renewable energy sources ,Streamflow ,Range (statistics) ,SWAT ,GE1-350 ,SWAT model ,stochastic models ,Environmental effects of industries and plants ,Renewable Energy, Sustainability and the Environment ,machine learning ,hydrological modelling ,Environmental sciences ,Data mining ,Data pre-processing ,computer - Abstract
Rainfall-Runoff simulation is the backbone of all hydrological and climate change studies. This study proposes a novel stochastic model for daily rainfall-runoff simulation called Stacked Long Short-Term Memory (SLSTM) relying on machine learning technology. The SLSTM model utilizes only the rainfall-runoff data in its modelling approach and the hydrology system is deemed a blackbox. Conversely, the distributed and physically-based hydrological models, e.g., SWAT (Soil and Water Assessment Tool) preserve the physical aspect of hydrological variables and their inter-relations while taking a wide range of data. The two model types provide specific applications that interest modelers, who can apply them according to their project specification and objectives. However, sparse distribution of point-data may hinder physical models’ performance, which may not be the case in data-driven models. This study proposes a specific SLSTM model and investigates the SLSTM and SWAT models’ data dependency in terms of their spatial distribution. The study was conducted in the two distinct river basins of Samarahan and Trusan, Malaysia, with over 20 years of hydro-climate data. The Trusan basin’s rain gauges are scattered downstream of the basin outlet and Samarahan’s are located around the basin, with one station within each basin’s limits. The SWAT was developed and calibrated following its general modelling approach, however, the SLSTM performance was also tested using data preprocessing with principal component analysis (PCA). Results showed that the SWAT performance for daily streamflow simulation at Samarahan has been superior to that of Trusan. Both the SLSTM and PCA-SLSTM models, however, showed better performance at Trusan with PCA-SLSTM outperforming the SLSTM. This demonstrates that the SWAT model is greatly affected by the spatial distribution of its input data, while data-driven models, irrespective of the spatial distribution of their entry data, can perform well if the data adequacy condition is met. However, considering the structural difference between the two models, each has its specific application in a water resources context. The study of catchments’ response to changes in the hydrology cycle requires a physically-based model like SWAT with proper spatial and temporal distribution of its entry data. However, the study of a specific phenomenon without considering the underlying processes can be done using data-driven models like SLSTM, where improper spatial distribution of data cannot be a restricting factor.
- Published
- 2021
44. Catalytic 4-exo-dig carbocyclization for the construction of furan-fused cyclobutanones and synthetic applications
- Author
-
Kemiao Hong, Yi Zhou, Haoxuan Yuan, Zhijing Zhang, Jingjing Huang, Shanliang Dong, Wenhao Hu, Zhi-Xiang Yu, and Xinfang Xu
- Subjects
Science - Abstract
Abstract Cyclobutanone is a strained motif with broad applications, while direct assembly of the aromatic ring fused cyclobutanones beyond benzocyclobutenone (BCB) skeletons remains challenging. Herein, we report a Rh-catalyzed formal [3+2] annulation of diazo group tethered alkynes involving a 4-exo-dig carbocyclization process, providing a straightforward access to furan-fused cyclobutanones. DFT calculations disclose that, by comparison to the competitive 5-endo-dig process, 4-exo-dig carbocyclization is mainly due to lower angle strain of the key sp-hybridized vinyl cationic transition state in the cyclization step. Using less reactive catalysts Rh2(carboxylate)4 is critical for high selectivity, which is explained as catalyst-substrate hydrogen bonding interaction. This method is proved successful to direct access previously inaccessible and unknown furan-fused cyclobutanone scaffolds, which can participate in a variety of post-functionalization reactions as versatile synthetic blocks. In addition, preliminary antitumor activity study of these products indicates that some molecules exhibite significant anticancer potency against different human cancer cell lines.
- Published
- 2023
- Full Text
- View/download PDF
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