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Permeability evolution and gas flow in wet coal under non-equilibrium state:Considering both water swelling and process-based gas swelling

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International Journal of Mining Science and Technology 2023年第5期33卷 585-599页

作者： Zhiyong Xiao gang Wang Changsheng Wang Yujing Jiang Feng Jiang chengcheng Zheng Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and TechnologyQingdao 266590China College of Civil Engineering Fujian University of TechnologyFuzhou 350118China c State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266590China

Accurate knowledge of gas flow within the reservoir and related controlling factors will be important for enhancing the production of coal bed *** present,most studies focused on the permeability evolution of dry coal under gas adsorption equilibrium,gas flow and gas diffusion within wet coal under the generally non-equilibrium state are often ignored in the process of gas *** this study,an improved apparent permeability model is proposed which accommodates the water and gas adsorption,stress dependence,water film thickness and gas flow *** the process of modeling,the water adsorption is only affected by water content while the gas adsorption is time and water content dependent;based on poroelastic mechanics,the effective fracture aperture and effective pore radius are derived;and then the variation in water film thickness for different pore types under the effect of water content,stress and adsorption swelling are modeled;the flow regimes are considered based on Beskok’s ***,after validation with experimental data,the proposed model was applied to numerical simulations to investigate the evolution of permeability-related factors under the effect of different water *** gas flow in wet coal under the non-equilibrium state is explicitly revealed.

关键词： Gas flow Apparent permeability Water film Adsorption Non-equilibrium state

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Fabrication of commercial pure Ti by selective laser melting using hydride-dehydride titanium powders treated by ball milling

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Journal of Materials Science & Technology 2019年第2期35卷 322-327页

作者： Wei Xu Shiqi Xiao Xin Lu gang Chen chengcheng Liu Xuanhui Qu Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing Key Laboratory for Advanced Powder Metallurgy and Particulate Materials Beijing Laboratory of Metallic Materials and Processing for Modern Transportation

Micro-fine sphericalpowders are recommended for selective laser melting(SLM). However, they are mostly expensive due to the complex manufacturing technique and low yield. In this paper, using lowcost treated hydride-dehydride(HDH) Ti powders, commercial pure Ti(CP-Ti) was successfully fabricated by SLM. After 4-h milling, the resulting powders become near-spherical with no obvious angularity, and have optimal flowability with the apparent density of 1.64 ± 0.02 g/cm^3, tap density of 2.10 ± 0.04 g/cm^3,angle of repose 40.11?±0.09?, and Carr's index of 77.74 ± 0.15. The microstructure was determined with full acicular martensitic β phase. The CP-Ti can achieve superior mechanical properties with the ultimate tensile strength of 876.1 ± 20.5 MPa and elongation of(14.7 ± 0.5)%, which exhibit distinctly competitive compared to the as-cast CP-Ti or Ti-6 Al-4 V. Excellent mechanical properties together with its low-cost make SLM-fabricated CP-Ti from modified HDH Ti powders show promising applications.

关键词： Selective laser melting Hydride-dehydride powders Titanium Microstructure Mechanical properties

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1981—2019年华北平原农田土壤有机碳储量的时空变化及影响机制

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生态学报 2022年第23期42卷 9560-9576页

作者：张婧婷石浩田汉勤逯非徐希燕刘迪刚诚诚方善民秦小羽潘乃青王思远中国科学院生态环境研究中心北京100085 奥本大学林业与野生生物科学学院国际气候与全球变化研究中心奥本36849 中国科学院大气物理研究所北京100029 西北农林科技大学水土保持研究所杨凌712100

农业土壤具有可观的固碳及减碳潜力,有助于减缓人类温室气体排放导致的气候变化。为了更好地了解华北平原土壤有机碳储量动态及其驱动因子,结合荟萃分析、随机森林机器学习模型和卫星遥感数据,研究了1981—2019年间中国华北平原农田土... 详细信息

农业土壤具有可观的固碳及减碳潜力,有助于减缓人类温室气体排放导致的气候变化。为了更好地了解华北平原土壤有机碳储量动态及其驱动因子,结合荟萃分析、随机森林机器学习模型和卫星遥感数据,研究了1981—2019年间中国华北平原农田土壤有机碳储量的时空变化及其驱动因子。结果表明,1981—2019年间华北平原0—20 cm农田土壤有机碳储量约为(523.10±79.36)Tg C((14.56±1.66)Mg C/hm^(2)),并以5.94 Tg C/a(0.12 Mg C hma)的年固持速率稳步增长,占比约为中国农田每年新增土壤有机碳的23.3%。其中,常规农田管理措施,包括无机肥施用、有机肥施用和秸秆还田,对土壤有机碳增长的贡献平均为25.1%,即1.49 Tg C/a(0.03 Mg C hma)。相比对照组,氮磷钾无机肥施用可提高22.7%—26.0%的土壤有机碳固定速率,有机肥可提高48.3%,秸秆还田可提高23.4%。同时,上述常规农田管理措施对土壤有机碳的积累作用受到土壤本身理化性质的调控,在温度和降水较高的气候条件下更显著。值得注意的是,无论是无机肥施用、有机肥施用还是秸秆还田,当投入量超过农作物和土壤微生物对碳和养分的需求时,土壤有机碳累积速率会显著下降。这也导致2000年后土壤有机碳固持速率明显减缓,由9.4 Tg C/a下降为3.5 Tg C/a。总的来说,过去几十年农田管理措施的改进显著提高了华北平原农田土壤有机碳的增加速率,而未来华北平原农田系统固碳潜力仍然可观,但亟待明确在保证粮食产量的同时不同气候和土壤环境条件下最佳固碳所需的化肥、有机肥和秸秆投入量。

关键词：土壤有机碳荟萃分析随机森林模型华北平原农田管理措施

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Personalized Federated Learning for Heterogeneous Residential Load Forecasting

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Big Data Mining and Analytics 2023年第4期6卷 421-432页

作者： Xiaodong Qu chengcheng Guan gang Xie Zhiyi Tian Keshav Sood Chaoli Sun Lei Cui the Shanxi Key Laboratory of Advanced Control and Equipment Intelligence Taiyuan University of Science and TechnologyTaiyuan 030024China the Faculty of Engineering and Information Technology University of Technology SydneyUltimo 2007Australia the Centre for Cyber Security Research and Innovation Deakin UniversityMelbourne 3125Australia the School of Computer Science and Technology Taiyuan University of Science and TechnologyTaiyuan 030024China

Accurate load forecasting is critical for electricity production,transmission,and *** learning(DL)model has replaced other classical models as the most popular prediction ***,the deep prediction model requires users to provide a large amount of private electricity consumption data,which has potential privacy *** nodes can federally train a global model through aggregation using federated learning(FL).As a novel distributed machine learning(ML)technique,it only exchanges model parameters without sharing raw ***,existing forecasting methods based on FL still face challenges from data heterogeneity and privacy ***,we propose a user-level load forecasting system based on personalized federated learning(PFL)to address these *** obtained personalized model outperforms the global model on local ***,we introduce a novel differential privacy(DP)algorithm in the proposed system to provide an additional privacy *** on the principle of generative adversarial network(GAN),the algorithm achieves the balance between privacy and prediction accuracy throughout the *** perform simulation experiments on the real-world dataset and the experimental results show that the proposed system can comply with the requirement for accuracy and privacy in real load forecasting scenarios.

关键词： load forecasting personalized federated learning differential privacy

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An injectable and coagulation-independent Tetra-PEG hydrogel bioadhesive for post-extraction hemostasis and alveolar bone regeneration

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Bioactive Materials 2024年第7期37卷 106-118页

作者： gang He Yiwen Xian Huajun Lin chengcheng Yu Luyuan Chen Zhihui Chen Yonglong Hong Chong Zhang Decheng Wu Guangdong Provincial Key Laboratory of Advanced Biomaterials Department of Biomedical EngineeringSouthern University of Science and TechnologyNo.1088 Xueyuan AvenueNanshan DistrictShenzhenGuangdong518055China Department of Maxillofacial Surgery Shenzhen HospitalSouthern Medical UniversityNo.1333 New RoadBaoan DistrictShenzhenGuangdong518101China

Effective control of post-extraction hemorrhage and alveolar bone resorption is critical for successful extraction socket treatment,which remains an unmet clinical ***,an injectable Tetra-PEG hydrogel that possesses rapid gelation,firm tissue adhesion,high mechanical strength,suitable degradability,and excellent biocompatibility is developed as a sutureless and coagulation-independent bioadhesive for the management of extraction *** results demonstrate that the rapid and robust adhesive sealing of the extraction socket by the Tetra-PEG hydrogel can provide reliable protection for the underlying wound and stabilize blood clots to facilitate tissue *** vivo experiments using an anticoagulated rat tooth extraction model show that the hydrogel significantly outperformed clinically used cotton and gelatin sponge in hemostatic efficacy,wound closure,alveolar ridge preservation,and in situ alveolar bone *** evaluations reveal the mechanisms for accelerated bone repair through suppressed long-term inflammation,elevated collagen deposition,higher osteoblast activity,and enhanced ***,our study highlights the clinical potential of the developed injectable Tetra-PEG hydrogel for treating anticoagulant-related post-extraction hemorrhage and improving socket healing.

关键词： Hydrogel bioadhesives Hemostatic hydrogels Alveolar ridge preservation Alveolar bone regeneration Blood clots

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Electromagnetic Performance Analysis of Flux-Switching Permanent Magnet Tubular Machine with Hybrid Cores

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CES Transactions on Electrical Machines and Systems 2020年第1期4卷 43-52页

作者： Shaopeng Wang chengcheng Liu Youhua Wang gang Lei Youguang Guo Jianguo Zhu State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology and Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei ProvinceHebei University of TechnologyTianjin300130China School of Electrical and Data Engineering University of Technology SydneyNSW 2007Australia school of electrical and information engineering University of SydenyNSW 2007Australia

The performance of traditional flux switching permanent magnet tubular machine(FSPMTM)are improved by using new material and structure in this *** existing silicon steel sheet making for all mover cores or part of stator cores are replaced by soft magnetic composite(SMC)cores,and the lamination direction of the silicon steel sheet in stator cores have be *** eddy current loss of the machine with hybrid cores will be reduced greatly as the magnetic flux will not pass through the silicon steel sheet *** order to reduce the influence of end effect,the unequal stator width design method is *** the new design,the symmetry of the permanent magnet flux linkage has been improved greatly and the cogging force caused by the end effect has been *** 2-D and 3-D finite element methods(FEM)are applied for the quantitative analysis.

关键词： Flux switching permanent magnet tubular machine soft magnetic composite(SMC) hybrid cores unequal width stator finite element method(FEM).

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Approach for Time Series Prediction Based on Empirical Mode Decomposition and Extreme Learning Machine

Approach for Time Series Prediction Based on Empirical Mode ...

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第30届中国控制与决策会议

作者： Tian Zhongda Mao chengcheng Wang gang Ren Yi College of Information Science and Engineering Shenyang University of Technology

In order to improve the prediction accuracy of time series, a prediction method based on empirical mode decomposition and extreme learning machine is proposed. Through empirical mode decomposition, original time series can be decomposed into different frequency components. The components after decomposing remove the long correlation, prominent and the different local characteristics of time series, which can reduce the non-stationary of time series. Different extreme learning machine is introduced to prediction each component with different frequencies. The prediction value of each component is superimposed to obtain the final prediction result. Two typical time series include Lorenz chaotic time series and network traffic time series are chosen as the simulation object. Simulation results show that the prediction method in this paper has a good performance with smaller prediction error.

关键词： Time series Prediction Empirical mode decomposition Extreme learning machine

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Development of a New Flux Switching Transverse Flux Machine with the Ability of Linear Motion

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CES Transactions on Electrical Machines and Systems 2018年第4期2卷 384-391页

作者： chengcheng Liu Shaopeng Wang Youhua Wang gang Lei Youguang Guo Jianguo Zhu State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology and Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei ProvinceHebei University of TechnologyTianjin300130China School of Electrical and Data Engineering University of Technology SydneyNSW 2007Australia school of electrical and information engineering University of SydenyNSW 2007Australia

This paper proposes a new rotary flux switching transverse flux machine with the ability of linear motion(FSTFMaLM),in which both the stator and the rotor cores are made by using soft magnetic composite(SMC)*** the special design pattern,for the rotary motion model,the proposed machine can combine both the advantages of the flux switching permanent magnet machine(FSPMM)and the transverse flux machine(TFM).It can output with relatively high torque density,and as there is no windings or the magnets on the rotor cores,the proposed machine can operate in the high speed region to improve the output *** the adoption of the SMC materials,the manufacturing of this machine can be quite *** stacking the rotor core together and prolong it with the determined length in the axial direction,in addition with the special control algorithm,the proposed machine can have the ability of the linear *** this paper,the operation principle of this machine has been explained and the design methods are also *** seek the better performance,the main dimension of the machine is optimized,and for the performance evaluation,the finite element method(FEM)is *** proposed machine can be used for the electric driving systems,robotic systems or other applications where the linear motion ability is required.

关键词： Flux switching linear motion high torque density soft magnetic composite(SMC) transverse flux machine

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从“学者”到“参谋”:社科院专家的治学范式转变

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图书馆论坛 2021年第10期41卷 38-48页

作者：吕诚诚李刚南京大学信息管理学院南京大学中国智库研究与评价中心

社科院既是哲学社会科学界“五路大军”之一,也是智库界五大主体之一,社科院专家的“参谋”角色正是在这种独特的身份演进中逐渐得到认可。这一现象也是社科院专家从传统治学范式转变为支撑科学决策体系的现代治学范式的体现。但在角色... 详细信息

社科院既是哲学社会科学界“五路大军”之一,也是智库界五大主体之一,社科院专家的“参谋”角色正是在这种独特的身份演进中逐渐得到认可。这一现象也是社科院专家从传统治学范式转变为支撑科学决策体系的现代治学范式的体现。但在角色转变过程中,社科院专家面临来自政府机构、社会组织、公众等利益相关者对其多重角色期望和角色扮演的压力,难免因角色固化、角色冲突和角色迷茫影响“参谋”职能的发挥。文章从角色理论视角出发,剖析社科院专家从学者型向参谋型转变过程中面临的角色期望和角色扮演,以及社会角色期望与实际角色扮演之间产生的偏差——角色困境,重新对角色进行建构,以期为中国特色哲学社会科学研究者寻求新的身份认同提供有益见解。文章倡导社科院专家重构自我学术生态,转变传统治学范式,践行“三力”要求,即学术治学理念和家国情怀的“坚守力”,找准角色定位;积极应对多种角色期望的“适应力”,增进角色认同;努力实现“四个转变”的“突破力”,完成角色学习,从而多方位多角度地为服务政府公共决策提供强有力的社科力量,当好参谋助手。

关键词：社会科学院治学范式角色理论参谋智囊团

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Fenton破解污泥减量化效果研究

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水处理技术 2019年第6期45卷 101-105页

作者：孟程程薛罡东华大学

利用Fenton试剂氧化破解剩余污泥,在序批式活性污泥法反应器(SBR)中,通过正交实验确定Fenton破解污泥的优化参数.结果表明,在污泥初始pH为3,H2O2和Fe2+投加量分别为5mL/L、0.25g/L,反应时间为90min时,Fenton氧化破解效果最佳,污泥上清液... 详细信息

利用Fenton试剂氧化破解剩余污泥,在序批式活性污泥法反应器(SBR)中,通过正交实验确定Fenton破解污泥的优化参数.结果表明,在污泥初始pH为3,H2O2和Fe2+投加量分别为5mL/L、0.25g/L,反应时间为90min时,Fenton氧化破解效果最佳,污泥上清液中SCOD和TN、NH3-N、多聚糖、蛋白质的质量浓度分别增至1.461g/L和99.5、30.3、137.5、256.3mg/L.将SBR的剩余污泥进行Fenton氧化处理并回流,表观污泥产率从对照组的0.4g/g降低到了0.23g/g,产泥量减少42.2%.Fenton破解污泥回流对SBR的SCOD和TN去除效果无明显影响,增强了TP的去除,对NH3-N去除略有降低.可为Fenton破解剩余污泥回流至SBR实现污泥减量提供基础依据.

关键词： Fenton破解序批式活性污泥法反应器污泥减量

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