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Numerical simulation of a self-absorbing microbubble generator for a cyclonic-static microbubble flotation column

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Mining Science and Technology 2010年第1期20卷 88-92页

作者： LI Lin LIU Jiongtian WANG Lijun yu hesheng School of Chemical Engineering and Technology China University of Mining & Technology Xuzhou 221116 China School of Mechanical and Electrical Engineering China University of Mining & Technology Xuzhou 221116 China Schulich School of Engineering University of Calgary Calgary T2N1N4 Canada

The Cyclonic-Static Microbubble Flotation Column (FCSMC) is currently a widely used, novel type of flotation device. The self-absorbing microbubble generator is the core component of this device. The structure of the microbubble generator directly influences flotation column performance by affecting bubble size and distribution as well as gas holdup in the column. However, the complicated flow inside the generator results in high R&D costs and difficulty in testing. Thus, the CFD software, FLUENT, was used to simulate the gas-liquid two-phase flow inside a self-absorbing microbubble generator. The effect of area ratio, a key structural parameter, was studied in detail. Critical flow-field parameters including velocity, turbulent kinetic energy, minimum static pressure and gas holdup were obtained. The simulation results demonstrate that the optimum area ratio is 3.

关键词： self-absorbing microbubble generator flotation column two-phase flow numerical simulation

STATNet:One-stage coal-gangue detector based on deep learning algorithm for real industrial application

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Energy and AI 2024年第3期17卷 113-125页

作者： Kefei Zhang Teng Wang Xiaolin Yang Liang Xu Jesse Thé Zhongchao Tan hesheng yu Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education School of Chemical Engineering and TechnologyChina University of Mining and TechnologyXuzhouJiangsu 221116China Department of Mechanical&Mechatronics Engineering University of Waterloo200 University Avenue WestWaterlooOntario N2L 3G1Canada Lakes Environmental Research Inc. 170 Columbia St.W.Suite 1WaterlooOntarioN2L 3L3 Canada Eastern Institute for Advanced Study Eastern Institute of TechnologyNingboZhejiang 315200China Department of Energy and Power Engineering Tsinghua UniversityBeijing 100084China

Coal-gangue object detection has attracted substantial attention because it is the core of realizing vision-based intelligent and green coal separation. However, most existing studies have been focused on laboratory datasets and prioritized model lightweight. This makes the coal-gangue object detection challenging to adapt to the complex and harsh scenes of real production environments. Therefore, our project collected and labeled image datasets of coal and gangue under real production conditions from a coal preparation plant. We then designed a one-stage object model, named STATNet, following the “backbone-neck-head” architecture with the aim of enhancing the detection accuracy under industrial coal preparation scenarios. The proposed model utilizes Swin Transformer as backbone module to extract multi-scale features, improved path augmentation feature pyramid network (iPAFPN) as neck module to enrich feature fusion, and task-aligned head (TAH) as head module to mitigate conflicts and misalignments between classification and localization tasks. Experimental results on a real-world industrial dataset demonstrate that the proposed STATNet model achieves an impressive AP50 of 89.27 %, significantly surpassing several state-of-the-art baseline models by 2.02 % to 5.58 %. Additionally, it exhibits stronger robustness in resisting image corruption and perturbation. These findings demonstrate its promising prospects in practical coal and gangue separation applications.

关键词： Coal-gangue detection Swin transformer Impr oved path augmentation feature pyranid network Task-aligned head Object detection

NbN quantum dots anchored hollow carbon nanorods as efficient polysulfide immobilizer and lithium stabilizer for Li-S full batteries

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Journal of Energy Chemistry 2024年第1期88卷 260-271,I0007页

作者： Fei Ma Zhuo Chen Katam Srinivas Ziheng Zhang yu Wu Dawei Liu hesheng yu yue Wang Xinsheng Li Ming-qiang Zhu Qi Wu yuanfu Chen School of Integrated Circuit Science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and TechnologyChengdu 610054SichuanChina College of Science and Institute of Oxygen Supply Center of Tibetan Studies(Everest Research Institute)Tibet UniversityLhasa 850000TibetChina College of Mechanical and Electronic Engineering Northwest A&F UniversityXianyang 712100ShaanxiChina

The shuttle effect of lithium polysulfides(LiPSs)and uncontrollable lithium dendrite growth seriously hinder the practical application of lithium-sulfur(Li-S)*** simultaneously address such issues,monodispersed Nb N quantum dots anchored on nitrogen-doped hollow carbon nanorods(NbN@NHCR)are elaborately developed as efficient Li PSs immobilizer and Li stabilizer for high-performance Li-S full *** functional theory(DFT)calculations and experimental characterizations demonstrate that the sulfiphilic and lithiophilic NbN@NHCR hybrid can not only efficiently immobilize the soluble Li PSs and facilitate diffusion-conversion kinetics for alleviating the shuttling effect,but also homogenize the distribution of Li+ions and regulate uniform Li deposition for suppressing Li-dendrite *** a result,the assembled Li-S full batteries(NbN@NHCR-S||Nb N@NHCR-Li)deliver excellent long-term cycling stability with a low decay rate of 0.031%per cycle over 1000 cycles at high rate of 2 *** at a high S loading of 5.8 mg cm^(-2)and a low electrolyte/sulfur ratio of 5.2μL mg^(-1),a large areal capacity of 6.2 mA h cm^(-2)can be achieved in Li-S pouch cell at 0.1 *** study provides a new perspective via designing a dual-functional sulfiphilic and lithiophilic hybrid to address serious issues of the shuttle effect of S cathode and dendrite growth of Li anode.

关键词： Dual-functional host NbN quantum dots Shuttle effect Dendrite-free Li anode Li-S full batteries

TWO COMPONENT LDV SYSTEM WITH DUAL-DIFFERENTIAL ACOUSTO-OPTICAL FREQUENCY SHIFT AND ITS APPLICATIONS

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Acta Mechanica Sinica 1986年第1期2卷 81-92页

作者： Shen Xiong Zhang Jingyi Wang Zongsen yu hesheng (Department of Engineering Mechanics,Tsinghua University) 1. Department of Engineering Mechanics Tsinghua University Beijing China

This paper describes the main properties of the two component LDV systemdeveloped with the dual-differential frequency shift *** has the advantages ofmultiple functions,better *** high utilization of *** it offers as a completetechnique and method for measuring 2-D complex *** applying this system,2-D turbulentseparated flow measurements have been made in a duct with an asymmetrical suddenexpansion and in a wind tunnel flow over a 2-D *** Reynolds numbers were at 5900 and 4500respectively.

关键词： laser doppler velocimetry frequency shift two component

“双碳”背景下传统化石能源脱碳制氢增值化利用技术

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清华大学学报（自然科学版） 2023年第8期63卷 1226-1235页

作者：俞和胜祁海鹰谭忠超中国矿业大学化工学院徐州221116 清华大学能源与动力工程系北京100084 滑铁卢大学机械与机电工程系加拿大滑铁卢N2L3G1

碳达峰和碳中和战略目标对全球经济与社会发展意义非凡。能源动力行业是中国二氧化碳排放大户,也是构建新型能源系统与产业革命的主战场。日趋成熟的碳捕集、利用和封存(carbon capture, utilization and storage,CCUS)技术因高成本、... 详细信息

碳达峰和碳中和战略目标对全球经济与社会发展意义非凡。能源动力行业是中国二氧化碳排放大户,也是构建新型能源系统与产业革命的主战场。日趋成熟的碳捕集、利用和封存(carbon capture, utilization and storage,CCUS)技术因高成本、高能耗面临产业界的强大阻力,转变能源结构至关重要,然而中国的资源禀赋和能源现状决定未来一段时间仍将继续依赖传统化石燃料。该文分析了催化裂解技术、碳材料和氢气利用、燃氢发电等多项前沿技术的可行性,提出了一个实现化石燃料高效清洁利用的革命性技术路线,以期高效、低排放、低成本地制备氢气和高附加值的碳材料,实现基于燃氢轮机的零排放发电。该技术路线有望解决相关能源动力企业的碳排放技术与经济难题,助力“双碳”目标实现。

关键词：双碳能源动力脱碳制氢新能源系统

Recent advances in Fe-N-C single-atom site coupled synergistic catalysts for boosting oxygen reduction reaction

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Electron 2024年第1期2卷 1-38页

作者： Katam Srinivas Jian Zhen hesheng yu Dawei Liu Jian Zhen Ou Ming‐qiang Zhu yuanfu Chen School of Integrated Circuit Science and Engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengduSichuanChina College of Mechanical and Electronic Engineering Northwest A&F UniversityYanglingChina School of Engineering RMIT UniversityMelbourneVictoriaAustralia

Metal-air batteries,fuel cells,and electrochemical H_(2)O2 production currently attract substantial consideration in the energy sector owing to their efficiency and ***,their broader use is hindered by the complex oxygen reduction reaction(ORR)that occurs at cathodes and involves intricate electron *** the significant ORR performance of platinum-based catalysts,their high cost,operational limitations,and susceptibility to methanol poisoning hinder broader *** emphasizes the need for efficient nonprecious metal-based ORR electrocatalysts.A promising approach involves utilizing single-atom catalysts(SACs)featuring metal-nitrogen-carbon(M-N-C)coordination *** offer advantages such as optimal utilization of metal atoms,uniform active centers,precisely defined catalytic sites,and robust metal-support ***,the symmetrical electron distribution around the central metal atom of a single-atom site(M-N4)often results in suboptimal ORR *** challenge can be addressed by carefully tailoring the surrounding environment of the active *** review specifically focuses on recent advancements in the Fe-N4 environment within Fe-N-C *** highlights the promising strategy of coupling Fe-N4 sites with metal clusters and/or nanoparticles,which enhances intrinsic *** capitalizing on the interplay between Fe-N4 sites and associated species,overall ORR performance *** review combines findings from experimental studies and density functional theory simulations,covering synthesis strategies for Fe-N-C coupled synergistic catalysts,characterization techniques,and the influence of associated particles on ORR *** offering a comprehensive outlook,the review aims to encourage research into high-efficiency Fe single-atom sites coupled synergistic catalysts for real-world applications in the coming years.

关键词： electrocatalysis oxygen reduction reaction particle@Fe-N-C single-atom catalysts synergistic catalysts

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环鄱阳湖地域著名诗人行绩考论

鄱阳湖学刊 2014年第6期 99-105页

作者：余和生上饶师范学院文学与新闻传播学院

鄱阳湖以其迷人的魅力,赢得过众多诗人的缘情礼赞,形成了独特的鄱阳湖文学景观。这一遒拔劲秀的奇葩,虽常有人赏顾,却往往不得其宗。为了弥补这一遗珠之憾,我们有必要作一些发掘性的研究。其实,把历代著名诗人描写鄱阳湖的诗作汇聚起来... 详细信息

鄱阳湖以其迷人的魅力,赢得过众多诗人的缘情礼赞,形成了独特的鄱阳湖文学景观。这一遒拔劲秀的奇葩,虽常有人赏顾,却往往不得其宗。为了弥补这一遗珠之憾,我们有必要作一些发掘性的研究。其实,把历代著名诗人描写鄱阳湖的诗作汇聚起来,大可以演奏一部洋洋洒洒、气势恢宏的鄱阳湖之歌,还鄱阳湖应有的文学史地位。

关键词：环鄱阳湖地域历代著名诗人鄱阳湖文学

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犊牛腹泻病防治

畜牧兽医科学（电子版） 2021年第6期 101-102页

作者：于合生辽宁省抚顺市新宾满族自治县永陵动物卫生监督所抚顺113200

犊牛腹泻是一种常发病和高发病,其中以5~7日龄的哺乳阶犊牛发病率最高,表现为体温升高,腹部疼痛难忍,呼吸频率显著增加,机体严重腹泻脱水,甚至出现酸中毒,严重的会造成犊牛死亡,给养殖场带来巨大经济损失。临床上引起犊牛出现腹泻的原... 详细信息

犊牛腹泻是一种常发病和高发病,其中以5~7日龄的哺乳阶犊牛发病率最高,表现为体温升高,腹部疼痛难忍,呼吸频率显著增加,机体严重腹泻脱水,甚至出现酸中毒,严重的会造成犊牛死亡,给养殖场带来巨大经济损失。临床上引起犊牛出现腹泻的原因十分复杂,主要表现为养殖管理不当,卫生环境较差,饲料营养价值较差,牛群身体抵抗能力不足,各种病原微生物会趁机侵染。犊牛腹泻发生后,如果不能及时明确致病原,经常会造成防治方案缺乏针对性,不能起到很好的防治效果,患病牛在短时间内会加重症状引发死亡。该文主要探讨犊牛腹泻疾病的防治措施。

关键词：犊牛腹泻发生防治

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大数据革新高校“双创”教育实践难点研究

山东农业工程学院学报 2017年第5期34卷 171-174页

作者：宋玉范和生安徽警官职业学院政治学院安徽合肥230031 安徽大学社会与政治学院安徽合肥230039

社会已进入大数据时代,教育也必将受其影响并进行革新。大数据与高校双创教育实践的融合必要且意义重大。但在大数据视阈下,高校双创教育实践还存在诸多问题和难点,需要通过加大人才技术支持、提供体制机制支撑、构建完善制度保障、共... 详细信息

社会已进入大数据时代,教育也必将受其影响并进行革新。大数据与高校双创教育实践的融合必要且意义重大。但在大数据视阈下,高校双创教育实践还存在诸多问题和难点,需要通过加大人才技术支持、提供体制机制支撑、构建完善制度保障、共建共享生态环境等途径,来提高大数据时代高校双创教育实践的实效。

关键词：大数据高校双创教育实践难点