检索结果-内蒙古大学图书馆

research on Weight-on-bit Self-adjusting Dual-diameter PDC Bit Design and Effect Evaluation Utilizing Stress-Releasing Effect of Rock at Bottomhole

引用

Arabian Journal for Science and Engineering 2021年第7期46卷 6925-6937页

作者： Hu, Huaigang Guan, Zhichuan Wang, Bin Lu, Baoping Chen, Weiqing Xu, Yuqiang Liu, Yongwang CNPC Engineering Technology R&D Company Limited Beijing China China University of Petroleum (East China) Qingdao China Shandong Ultra-Deep Drilling Process Control Tech R&D Center Qingdao China Qingdao Refining and Chemical Co. LTD Qingdao China Sinopec Research Institute of Petroleum Engineering Beijing China King Fahd University of Petroleum and Minerals (KFUPM) Dhahran Saudi Arabia

Rock-breaking efficiency is not so satisfied using the conventional PDC bit, especially in the hard, soft–hard interbedded, and strong abrasive formations in ultra-deep wells. A method is proposed to make full use of stress-releasing effect at bottomhole, thereby improving the rock-breaking efficiency, and a supporting weight-on-bit (WOB) self-adjusting dual-diameter PDC bit (WSDB) has been invented. The WSDB can dynamically adjust the depth-of-cut control characteristics, which could improve the rate of penetration (ROP) while mitigating the stick–slip vibration caused by the rapid change of depth of cut. The stress field of the rock at the bottomhole is calculated with a numerical method, and the working mechanism of the bit is analyzed. The application effect of the WSDB is evaluated through laboratory tests preliminarily. The results show that the stress concentration area on the shoulder of the reaming bit is decreased obviously and a larger stress unloading area emerges in the intersection between reaming and pilot bit. Thus, mechanical specific energy (MSE) can be greatly reduced when the reaming bit drills into this section. Indoor tests show that the maximum ROP of WSDB can be reached up to 70% higher compared to the conventional PDC bit, and higher ROP could be obtained with a relatively lower bit torque. With drilling parameters greater than the critical revolution and WOB, the reduction in MSE can be reached up to 36% during the rock-breaking process. Making further efforts into the optimization of bit structure to reduce the vibration intensity is expected to achieve more improved bit performance.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Advances in Z-scheme and S-scheme heterojunctions for photocatalytic and photoelectrocatalytic H 2 O 2 production

引用

Chinese chemical Letters 2025年

作者： Xibao Li Yiyang Wan Fang Deng Yingtang Zhou Pinghua Chen Fan Dong Jizhou Jiang National-Local Joint Engineering Research Center of Heavy Metal Pollutants Control and Resource Utilization Nanchang Hangkong University Nanchang 330063 China Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control National Engineering Research Center for Marine Aquaculture Marine Science and Technology College Zhejiang Ocean University Zhoushan 316004 China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 611731 China School of Materials Science and Engineering State Key Laboratory of Green and Efficient Development of Phosphorus Resources Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education Key Laboratory of Green Chemical Engineering Process of Ministry of Education Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Novel Catalytic Materials of Hubei Engineering Research Center Wuhan Institute of Technology Wuhan 430205 China

Photocatalytic and photoelectrocatalytic H 2 O 2 production has been identified as a significant pathway within environmental pollution control, green energy, medical treatment, sterilization and disinfection. However, conventional single-material photocatalysts struggle to fulfill the stringent criteria of high efficiency, stability, cost-effectiveness, and responsiveness to visible light. The elevated recombination rates of photogenerated charge carriers, coupled with the suboptimal utilization of visible light, have collectively constrained the photocatalytic and photoelectrocatalytic H 2 O 2 production. Heterojunction catalysts for the production of H 2 O 2 has become a focal point of research. This review commences by elucidating the fundaments underlying the photocatalytic and photoelectrocatalytic H 2 O 2 production. Subsequently, it delineates the distinctive electron transfer mechanisms of Z-scheme and S-scheme heterojunctions, which exhibit enhanced efficiency in the photocatalytic and photoelectrocatalytic H 2 O 2 production, along with a summary of strategies for the improvement of photocatalyst and photoelectrocatalyst performance. Furthermore, this review also outlines the latest fabrication strategies, state-of-the-art in-situ characterization techniques, machine learning and density functional theory (DFT) simulations for Z-scheme or S-scheme catalysts for the photocatalytic and photoelectrocatalytic H 2 O 2 production, and briefly describes the multifunctional applications in H 2 O 2 production. Ultimately, the review contemplates the prospective developmental trajectories and application potential of these heterojunction configurations for the photocatalytic and photoelectrocatalytic H 2 O 2 production.

关键词：

来源：评论

学校读者我要写书评

暂无评论

H_2/CO_2 Gas Transport Performance in Poly(Ethylene Oxide) Reverse-selective Membrane with Star-like Structures

引用

Journal of Wuhan University of Technology(Materials Science) 2019年第1期34卷 195-200页

作者： ZHAO Hongyong DING Xiaoli State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membrane Tianjin Polytechnic University Tianjin Key Laboratory of Hollow Fiber Membrane Materials and Processes Tianjin Polytechnic University School of Environmental and Chemical Engineering Tianjin Polytechnic University Institute of Separation Material and Process Control School of Material Science and EngineeringTianjin Polytechnic University

A series of poly(ethylene oxide)(PEO) membranes with star-like structures for CO_2/H_2 separation were prepared by the photo-polymerization method. The structure of PEO membrane was characterized by Fourier transform infrared spectroscopy(FTIR). The thermal property and inter-segmental distance of polymer chain were investigated by differential scanning calorimetry and wide-angle X-ray diffraction, respectively. The density was determined by hydrostatic weighing method. The gas permeability, solubility and diffusivity of CO_2 and H_2 were investigated in the star-like PEO membranes. The relationship between gas permeation performances and physical properties was also discussed. The membrane exhibits outstanding CO_2 permeability(about 9.7×10^(-11) cm^3(STP) cm/cm^2/s/Pa) and CO_2/H_2 selectivity(about 11) compared with other membranes.

关键词： hydrogen purification reverse-selective membrane poly(ethylene oxide) star-like structure

来源：评论

学校读者我要写书评

暂无评论

Removal of arsenic contaminants using a novel porous nanoadsorbent with superior magnetic recovery

引用

chemical Engineering Science: X 2020年 8卷

作者： Lin, Sen Jin, Junjie Sun, Shuying Yu, Jianguo National Engineering Research Center for Integrated Utilization of Salt Lake Resources East China University of Science and Technology Shanghai China State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and Technology Shanghai China Shanghai Institute of Pollution Control and Ecological Security Shanghai China

Novel porous and magnetic iron oxide nanoparticles (PMNPs) with good magnetic properties were synthesized through a simple sol–gel method and exhibited excellent adsorption performance for aqueous arsenic contaminants as well as magnetic recoverability. Hysteresis loop analysis confirmed that the PMNPs were typical superparamagnetic material with a ultrahigh magnetic saturation (Ms) of 94.77 emu/g, which allowed their quick and complete recovery even under magnetic fields less than 0.25 T. The kinetics and isotherms results confirmed that adsorption equilibrium could achieved in 30 min and the saturated adsorption capacities for As(III) and As(V) exceeded 0.64 and 0.76 mmol/g at 30 °C. The effects of initial pH and diverse co-existing ions demonstrated that the optimal conditions for arsenic removal were closely related to the PMNPs surface charge distribution and the electron density of As(III) and As(V). In addition, after 10 adsorption–desorption cycles, PMNPs still held more than 80% of the primal arsenic adsorption capacities. © 2020

关键词： Adsorption

来源：评论

学校读者我要写书评

暂无评论

Enhanced Photocatalytic Co2 Reduction to Ch4 Using Rgo Supported and AU Coated Tio2 Nanotube Arrays (Tntas)

SSRN

引用

SSRN 2023年

作者： Hossen, Md. Arif Khatun, Fatema Muhammad, Aamina Din Aziz, Azrina Abd Leong, Kah Hon Sim, Lan Ching Ikreedeegh, Riyadh Ramadhan Lihua, Wu Monir, Minhaj Uddin Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Pahang Gambang26300 Malaysia Center for Environmental Science & Engineering Research Chittagong University of Engineering and Technology Chattogram4349 Bangladesh Faculty of Civil Engineering Technology Universiti Malaysia Pahang Pahang Gambang26300 Malaysia Department of Environmental Engineering Faculty of Engineering and Green Technology Universiti Tunku Abdul Rahman Kampar Perak 31900 Malaysia Department of Chemical Engineering Lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul Rahman Selangor Kajang43200 Malaysia Department of Analysis and Quality Control Sarir Oil Refinery Arabian Gulf Oil Company Benghazi Libya School of Chemical and Energy Engineering Universiti Teknologi Malaysia Johor Johor Bahru81310 UTM Malaysia Kuantan Sunny Scientific Collaboration Sdn. Imbi Plaza Jalan Imbi Bhd. Suites 7.23 7th Floor Kuala Lumpur55100 Malaysia Department of Petroleum and Mining Engineering Jashore University of Science and Technology Jashore7408 Bangladesh

Photocatalytic CO2 reduction into hydrocarbon fuels is one of the most efficient processes since it serves as a renewable energy source while also lowering atmospheric CO2 levels. The development of appropriate materials and technology to attain greater yield in CO2 photoreduction is one of the key issues facing the 21st century. This study successfully fabricated novel ternary reduced graphene oxide/Au-TiO2 nanotube arrays (RGO/ Au-TNTAs) photocatalyst to promote CO2 photoreduction to *** light responsive RGO/ Au-TNTAs composite were synthesized by facile electrochemical deposition of Au nanoparticles (NPs) and immersion of RGO nanosheets onto TNTAs. Under the source of visible light, the maximum yield of CH4 was attained 35.13 ppm/cm2 for RGO/Au-TNTAs composite photocatalyst after 4 h, which was much higher than that of pure TNTAs, Au-TNTAs and RGO-TNTAs. The CO2 photoreduction of RGO/Au-TNTAs composite has been improved due to combined effects of Au NPs and RGO. Due to its surface plasmonic resonance mechanism, Au NPs plays a crucial role as a photosensitizer for the absorption of visible light. Additionally, the middle RGO layers serve as effective electron transporters, facilitating better separation of electron-hole pairs. The newly constructed composite would be a promising photocatalyst for future photocatalytic applications in other fields. © 2023, The Authors. All rights reserved.

关键词： Carbon dioxide

来源：评论

学校读者我要写书评

暂无评论

Implementing urban agriculture as nature-based solutions in China: Challenges and global lessons

Soil and Environmental Health

引用

Soil and Environmental Health 2024年第1期2卷

作者： Zhu, Zhe Chan, Faith Ka Shun Li, Gang Xu, Mengxia Feng, Meili Zhu, Yong-Guan Key Laboratory of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China Department of Chemical and Environmental Engineering University of Nottingham Ningbo China Ningbo 315100 China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control CAS Haixi Industrial Technology Innovation Center in Beilun Ningbo 315830 China School of Geographical Sciences University of Nottingham Ningbo China Ningbo 315100 China Water@Leeds School of Geography University of Leeds Leeds LS2 9JT United Kingdom Research Base for Shenzhen Municipal Policy & Development Southern University of Science and Technology Shenzhen 518000 China New Materials Institute University of Nottingham Ningbo China Ningbo 315100 China Key Laboratory for Carbonaceous Wastes Processing and Process Intensification of Zhejiang Province University of Nottingham Ningbo China Ningbo 315100 China State Key Lab of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Urban agriculture, the cultivation, processing and distribution of plants and animals within urban or suburban boundaries, is becoming an increasingly relevant strategy to enhance food safety for urban residents. With the rapid urbanization in the past decades, three forms of urban agriculture have emerged in China: small-scale, capital-intensive, and tourism-type. Each form presents unique benefits and challenges, and their development has been largely shaped by the local socio-economic context and government policies. The benefits of urban agriculture are numerous including the improvement of community cohesion, promotion of physical health, enhancement of environmental sustainability, and creation of new economic opportunities. However, it also faces many challenges such as land availability, capital shortage, market access, and governmental support. This review summarized the benefits of urban agriculture and its current limitations and challenges, and proposed strategies to overcome these hurdles in China based on successful examples in the Global North. Four specific recommendations were provided to promote urban agriculture in China: integration of urban agriculture into cities, solutions for land and resource use, government support and reactions, as well as planning and regulations. Adoption these recommendations is expected to result in healthier cities and a more robust agricultural system in China. © 2024 The Author(s)

关键词： Environmental health Environmental sustainability Food security Global North Green city One health Urban farming Urban planning

来源：评论

学校读者我要写书评

暂无评论

The effect of ion exchange membranes on the bipolar membrane electrodialysis of ammonium chloride wastewater

引用

IOP Conference Series: Earth and Environmental Science 2021年第1期675卷

作者： Ya Li Wei Li Shaoyuan Shi Xinmin Wu College of Chemical Engineering Beijing Institute of Petro-Chemical Technology Beijing 102617 China National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Beijing Engineering Research Center of Process Pollution Control Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China

The different bipolar membranes and their configurations with monopolar ion exchange membranes from different manufacturers such as FAB-FBM-FKB, AHA-(BP-1E)- CMB, and JAM-(BMP-1)-JCM are used in the bipolar membrane electrodialysis (BMED) of simulated NH4Cl wastewater to examine the effect of membrane properties on the generation of HCl and NH3H2O. The results indicated that the configuration of AHA-(BP-1E)-CMB presented the promising performance among all the ion exchange membranes according to the generated acid and base concentration. And the configuration of FAB-FBM-FKB presented the expected performance on the membrane stack voltage, energy consumption, current efficiency of the BMED system. The stability of different ion exchange membranes in strong acid and base solution were investigated further by the analyses of SEM, contact angle and membrane resistance. It was found that the membranes AHA and FKB had better chemical stability than other membranes.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Recent advancements and challenges in emerging applications of biochar-based catalysts

引用

Biotechnology Advances 2023年 67卷 108181页

作者： Yuan, Xiangzhou Cao, Yang Li, Jie Patel, Anil Kumar Dong, Cheng-Di Jin, Xin Gu, Cheng Yip, Alex C.K. Tsang, Daniel C.W. Ok, Yong Sik Ministry of Education of Key Laboratory of Energy Thermal Conversion and Control School of Energy and Environment Southeast University Nanjing210096 China Korea Biochar Research Center APRU Sustainable Waste Management Program & Division of Environmental Science and Ecological Engineering Korea University Seoul02841 Korea Republic of Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China Institute of Aquatic Science and Technology College of Hydrosphere National Kaohsiung University of Science and Technology Kaohsiung81157 Taiwan Department of Marine Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung81157 Taiwan State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China Department of Chemical and Process Engineering University of Canterbury Christchurch New Zealand Research Centre for Resources Engineering towards Carbon Neutrality The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong

The sustainable utilization of biochar produced from biomass waste could substantially promote the development of carbon neutrality and a circular economy. Due to their cost-effectiveness, multiple functionalities, tailorable porous structure, and thermal stability, biochar-based catalysts play a vital role in sustainable biorefineries and environmental protection, contributing to a positive, planet-level impact. This review provides an overview of emerging synthesis routes for multifunctional biochar-based catalysts. It discusses recent advances in biorefinery and pollutant degradation in air, soil, and water, providing deeper and more comprehensive information of the catalysts, such as physicochemical properties and surface chemistry. The catalytic performance and deactivation mechanisms under different catalytic systems were critically reviewed, providing new insights into developing efficient and practical biochar-based catalysts for large-scale use in various applications. Machine learning (ML)-based predictions and inverse design have addressed the innovation of biochar-based catalysts with high-performance applications, as ML efficiently predicts the properties and performance of biochar, interprets the underlying mechanisms and complicated relationships, and guides biochar synthesis. Finally, environmental benefit and economic feasibility assessments are proposed for science-based guidelines for industries and policymakers. With concerted effort, upgrading biomass waste into high-performance catalysts for biorefinery and environmental protection could reduce environmental pollution, increase energy safety, and achieve sustainable biomass management, all of which are beneficial for attaining several of the United Nations Sustainable Development Goals (UN SDGs) and Environmental, Social and Governance (ESG). © 2023 The Authors

关键词： Biodiversity

来源：评论

学校读者我要写书评

暂无评论

A Multi-Echelon Supply Chain Model for Sustainable Electricity Generation from Municipal Solid Waste

引用

IFAC-PapersOnLine 2019年第1期52卷 610-615页

作者： M. Mohammadi S-L. Jämsä-Jounela I. Harjunkoski Research Group of Process Control and Automation Department of Chemical and Metallurgical Engineering School of Chemical Engineering Aalto University FI-00076 Espoo Finland ABB Corporate Research Center Germany Wallstadter Str. 59 68526 Ladenburg Germany

This paper addresses a mixed integer linear programming model for the optimal utilization of municipal solid waste in a multi-echelon supply chain network. The model focuses on tactical and operational level decisions including the supply, production, and distribution. It aims to maximize the annual net profit by optimizing the choice of waste-to-energy technologies through observing the related capacity and environmental constraints and market demands. The proposed sustainable waste management model not only reduces the burden on the environment, but also optimally distributes the solid waste through the system and converts it into electricity, thus contributing towards energy supply. Sensitivity analyses are conducted to investigate the effects of changes in waste separation rate, energy conversion rate, and energy efficiencies on the system performance and on the environment. The model is solved using GAMS/CPLEX.

关键词： municipal solid waste waste management waste-to-energy sustainability supply chain management mixed integer linear programming

来源：评论

学校读者我要写书评

暂无评论

Corrigendum to Press perturbations of microplastics and antibiotics on freshwater micro-ecosystem: Case study for the ecological restoration of submerged plants [Water research, Volume 226, November 2022, 119248]

引用

Water research 2023年 229卷

作者： Siyu Zhang Hao Wang Miaomiao Liu Hongwei Yu Jianfeng Peng Xiaofeng Cao Raf Dewil Chunrong Wang Ruiping Liu Mohammadreza Kamali Jiuhui Qu Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China School of Chemical and Environmental Engineering China University of Mining and Technology (Beijing) Beijing 100083 China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Process and Environmental Technology Lab Department of Chemical Engineering KU Leuven J. De Nayerlaan 5 B-2860 Sint-Katelijne-Waver Belgium

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：