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RB-DEM Modeling and Simulation of Non-Persisting Rough Open Joints Based on the IFS-Enhanced Method

Computer Modeling in Engineering & Sciences 2024年第4期139卷 337-359页

作者： Hangtian song xudong Chen Chun Zhu Qian Yin Wei Wang Qingxiang Meng Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing210098China Research Institute of Geotechnical Engineering Hohai UniversityNanjing210098China School of Earth Sciences and Engineering Hohai UniversityNanjing210098China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China

When the geological environment of rock masses is disturbed,numerous non-persisting open joints can appear within it.It is crucial to investigate the effect of open joints on the mechanical properties of rock mass.However,it has been challenging to generate realistic open joints in traditional experimental tests and numerical simulations.This paper presents a novel solution to solve the problem.By utilizing the stochastic distribution of joints and an enhanced-fractal interpolation system(IFS)method,rough curves with any orientation can be generated.The Douglas-Peucker algorithm is then applied to simplify these curves by removing unnecessary points while preserving their fundamental shape.Subsequently,open joints are created by connecting points that move to both sides of rough curves based on the aperture distribution.Mesh modeling is performed to construct the final mesh model.Finally,the RB-DEM method is applied to transform the mesh model into a discrete element model containing geometric information about these open joints.Furthermore,this study explores the impacts of rough open joint orientation,aperture,and number on rock fracture mechanics.This method provides a realistic and effective approach for modeling and simulating these non-persisting open joints.

关键词： Non-persisting rough open joints stochastic distribution of joints enhanced-IFS method RB-DEM

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Effect of slag composition on corrosion resistance of high chromia refractory bricks for industrial entrained-flow gasifier

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Chinese Journal of Chemical Engineering 2023年第10期62卷 139-149页

作者： Jinghong Gao Weiguang Su xudong song Peng Lv Jun Yang Guangsuo Yu State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China Chinese Energy Ningxia Coal Industry Co. Ltd.Yinchuan 750021China Institute of Clean Coal Technology East China University of Science and TechnologyShanghai 200237China

The slag composition corresponding to different coals varies significantly,which directly affects the operation of industrial entrained-flow gasifier and the service life of refractory bricks.In this study,the corrosion resistance of several typical coal slags for gasification on high chromia refractory bricks was comparatively investigated by static laboratory crucible tests and thermodynamic simulations.The results demonstrated that the corrosion degree of high chromia refractory bricks by different coal slags was high-Ca/Na slag>high-Fe slag>high-Si/Al slag.The surface structure of the refractory was relatively flat after corrosion by high-Si/Al slag,and the primary corrosion reaction was the partial dissolution of the matrix by the slag.High-Fe slag was prone to the precipitation of iron phases as well as the formation of(Mg,Fe)(Al,Cr)_(2)O_(4)composite spinel layer at the slag/refractory interface.The high-Ca/Na slag was susceptible to react with the refractory to yield a low melting point phase,which led to the destruction of the matrix structure of the refractory and an isolated distribution of particles.In addition,the monoclinic ZrO_(2) in the refractory reacted with CaO in the slag to formed calcium zirconate,which loosened its phase toughening effect,was the primary factor that aggravated the refractory corrosion.

关键词： Entrained-flow gasifier Coal slag High chromia refractory Corrosion Permeation Viscosity

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Chimeric antigen receptor-immune cells against solid tumors: Structures, mechanisms, recent advances, and future developments

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中华医学杂志(英文版) 2024年第11期137卷 2023 Aug 28页

作者： Li xudong Li Wei Xu Linping song Yongping Department of Hematology The Affiliated Cancer Hospital of Zhengzhou University &amp Henan Cancer Hospital Zhengzhou Henan China Academy of Medical Sciences Zhengzhou University Zhengzhou Henan China Department of Hematology The First Affiliated Hospital of Zhengzhou University Zhengzhou Henan China

The advent of chimeric antigen receptor (CAR)-T cell immunotherapies has led to breakthroughs in the treatment of hematological malignancies. However, their success in treating solid tumors has been limited. CAR-natural killer (NK) cells have several advantages over CAR-T cells because NK cells can be made from pre-existing cell lines or allogeneic NK cells with a mismatched major histocompatibility complex (MHC), which means they are more likely to become an "off-the-shelf" product. Moreover, they can kill cancer cells via CAR-dependent/independent pathways and have limited toxicity. Macrophages are the most malleable immune cells in the body. These cells can efficiently infiltrate into tumors and are present in large numbers in tumor microenvironments (TMEs). Importantly, CAR-macrophages (CAR-Ms) have recently yielded exciting preclinical results in several solid tumors. Nevertheless, CAR-T, CAR-NK, and CAR-M all have their own advantages and limitations. In this review, we systematically discuss the current status, progress, and the major hurdles of CAR-T cells, CAR-NK cells, and CAR-M as they relate to five aspects: CAR structure, therapeutic mechanisms, the latest research progress, current challenges and solutions, and comparison according to the existing research in order to provide a reasonable option for treating solid tumors in the future.

关键词： Immunotherapy Chimeric antigen receptor-T cells Chimeric antigen receptor-NK cells Chimeric antigen receptor-macrophage Solid tumors

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Crystallization and viscosity-temperature characteristics during co-gasification of industrial sludge and coal

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Frontiers in Energy 2022年第6期16卷 1037-1047页

作者： Linmin ZHANG Bin LIU Juntao WEI xudong song Yonghui BAI Jiaofei WANG Ying ZHOU Huijun YANG Guangsuo YU State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China Joint International Research Laboratory of Biomass Energy and Materials Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesCollege of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China Institute of Coal Chemical Industry Technology Ningxia Coal Industry Co.Ltd.Yinchuan 750000China Institute of Clean Coal Technology East China University of Science and TechnologyShanghai 200237China

Co-gasification of industrial sludge(IS)and coal was an effective approach to achieve harmless and sustainable utilization of IS.The long-term and stable operation of a co-gasification largely depends on fluidity of coal-ash slag.Herein,the effects of IS addition on the crystallization and viscosity of Shuangmazao(SMZ)coal were investigated by means of high temperature stage coupled with an optical microscope(HTSOM),a scanning electron microscopy coupled with an energy dispersive Xray spectrometry(SEM-EDS),X-ray diffraction(XRD),a Fourier transform infrared spectrometer(FTIR),and FactSage software.The results showed that when the proportion of IS was less than 60%,with the addition of IS,the slag existed in an amorphous form.This was due to the high content of SiO_(2) and Al_(2)O_(3) in SMZ ash and blended ash,which had a high glass-forming ability(GFA).The slag formed at a high temperature had a higher polymerization degree and viscosity,which led to a decrease in the migration ability between ions,and ultimately made the slag difficult to crystallize during the cooling.When the proportion of IS was higher than 60%,the addition of IS increased the CaO and FeO content in the system.As network modifiers,CaO and FeO could provide O^(2−)at a high temperature,which reacted with silicate network structure and continuously destroyed the complexity of network structure,thus reducing the polymerization degree and viscosity of slag.At this time,the migration ability between ions was enhanced,and needle-shaped/rod-shaped crystals were precipitated during the cooling process.Finally,the viscosity calculated by simulation and Einstein-Roscoe empirical formula demonstrated that the addition of IS could significantly improve the fluidity of coal ash and meet the requirements of the liquid slag-tapping gasifier.The purpose of this work was to provide theoretical support for slag flow mechanisms during the gasifier slagging-tapping process and the resource treatment of industrial solid waste.

关键词： co-gasification industrial sludge crystallization viscosity mineral matter evolution

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Economics of energy storage technology in active distribution networks

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Journal of Modern Power Systems and Clean Energy 2015年第4期3卷 583-588页

作者： Jiongcong CHEN xudong song South China University of Technology Guangzhou 510640GuangdongChina Electric Power Research Institute of Guangdong Power Grid Co.Ltd. Guangzhou 510080GuangdongChina

An economic and environmental evaluation of active distribution networks containing lithium ion batteries(Li-ion),sodium sulfur batteries(NaS)and vanadium redox flow batteries(VRB)was carried out using the EnergyPLAN software.The prioritization schemes of the combination of energy storage systems and intermittent energy systems were studied technically and economically based on some specific situations of the grid integrated with wind power.The results suggest that the technical and economic optimal intermittent energy-storage capacity ratio was 2:1 in predetermined energy system scenarios.Liion batteries storage system performed the best in critical excess electricity production(CEEP)absorption,energy saving and emission reduction while NaS batteries storage system was the most competitive among the three due to its cheaper costs.

关键词： Active distribution networks Intermittent power sources Battery energy storage Economy Optimization

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材料表面微图案结构成型技术及其研究进展

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材料工程 2024年第4期52卷 87-101页

作者：裴云亮姚煜邹文俊彭进宋旭东河南工业大学材料科学与工程学院郑州450001 白鸽磨料磨具有限公司郑州450007

表面微图案结构成型技术作为实现材料表面纹理化并促进材料先进化、功能化的一种手段已经广泛应用到实际生产制造中。根据材料应用领域的差异,表面微图案成型的主要方法包括热压花、化学蚀刻、电火花加工、光刻和3D打印。本文综述了不... 详细信息

表面微图案结构成型技术作为实现材料表面纹理化并促进材料先进化、功能化的一种手段已经广泛应用到实际生产制造中。根据材料应用领域的差异,表面微图案成型的主要方法包括热压花、化学蚀刻、电火花加工、光刻和3D打印。本文综述了不同表面微图案结构成型技术及制备表面纹理化功能材料的基本原理,并列举其在光伏、电子信息、智能制造、超精密制造等领域的实际应用。总结了不同表面微图案结构成型技术的特点及适用范围,提出了实现材料表面纹理化和功能化所面临的关键问题,为表面微图案结构的微加工技术提供了一定参考。

关键词：微图案热压花蚀刻电火花加工光刻 3D打印

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电压控制型虚拟同步发电机的高频谐振特性分析与抑制策略

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华南理工大学学报（自然科学版） 2024年第2期52卷 50-61页

作者：李智刘明波刘辉宋鹏李旭东王帆华南理工大学电力学院广东广州510640 国网冀北电力有限公司电力科学研究院(华北电力科学研究院有限责任公司) 北京100045 国家电网公司风光储联合发电运行技术实验室北京100045 中广核新能源控股有限公司北京100071 北京电力交易中心有限公司北京100051

虚拟同步发电机(VSG)模拟同步发电机的运行机制,引入了有功调频和无功调压控制环节,与传统电流控制型变流器不同,是一种电压控制型策略。文中立足电压控制型虚拟同步发电机控制结构和网源协调特性,构建小信号分析模型,分析在不同控制参... 详细信息

虚拟同步发电机(VSG)模拟同步发电机的运行机制,引入了有功调频和无功调压控制环节,与传统电流控制型变流器不同,是一种电压控制型策略。文中立足电压控制型虚拟同步发电机控制结构和网源协调特性,构建小信号分析模型,分析在不同控制参数与电网参数场景下的振荡模态,进而掌握电压控制型虚拟同步发电机并网系统的高频谐振特性,并针对性提出高频谐振抑制策略。首先,分别建立电压控制型虚拟同步发电机、传统变流器各控制和电气环节的小信号分析模型,通过特征根分析方法,定量分析所有特征根的振荡模态和阻尼比,发现电压控制型虚拟同步发电机存在与传统变流器类似的高频振荡模态;同时分析虚拟同步发电机控制参数变化、电网强弱场景对其高频谐振阻尼作用机理。其次,基于电压控制型虚拟同步发电机控制策略,以有源阻尼方法为解决思路,提出基于电流内环前端通道引入虚拟阻抗控制策略的谐振抑制方法,抑制其高频谐振。最后,利用Matlab/Simulink仿真和RT-LAB控制器在环实验结果验证所提出的控制策略,结果表明虚拟阻抗控制环节起到有效正阻尼作用,相比于无源阻尼方法,在无需额外增加测点和外部控制量的情况下,电压控制型VSG网侧阻尼特性改善,暂态响应能力增强,高频失稳现象得到有效抑制。

关键词：虚拟同步发电机小信号模型特征根高频谐振虚拟阻抗

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基于自适应权重时间卷积网络的剩余使用寿命预测方法

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北京化工大学学报（自然科学版） 2024年第3期51卷 76-87页

作者：宋浏阳金烨郭旭东王华庆北京化工大学高端机械装备健康监控与自愈化北京市重点实验室北京100029 北京化工大学高端压缩机及系统技术全国重点实验室北京100029 长鑫集电(北京)存储技术有限公司北京100176

随着人工智能和大数据技术的发展,基于深度学习的高端装备剩余使用寿命预测技术倍受关注,准确的剩余使用寿命预测对于高端装备安全运行意义重大。大多数基于深度学习的预测方法在构建主体预测结构通常利用循环神经网络、长短期记忆网络... 详细信息

随着人工智能和大数据技术的发展,基于深度学习的高端装备剩余使用寿命预测技术倍受关注,准确的剩余使用寿命预测对于高端装备安全运行意义重大。大多数基于深度学习的预测方法在构建主体预测结构通常利用循环神经网络、长短期记忆网络和门控单元等手段,但存在并行计算能力较差、预测精度不足的问题。针对上述问题,提出一种基于自适应权重时间卷积网络的寿命预测方法。采用时间卷积网络搭建预测模型,利用空洞因果卷积和残差连接结构增强并行计算能力并避免信息泄露;构建基于自注意力机制的自适应权重模块,实现时序权重自动分配来提高预测精度;利用非对称损失函数增强提前预测倾向性,避免因滞后预测带来的安全和经济问题。选取发动机数据集和轴承数据集进行实验验证,结果表明,与其他深度学习方法相比,提出的自适应权重时间卷积网络提升了预测准确率并缩短了训练时间。

关键词：剩余使用寿命深度学习时间卷积网络自注意力机制

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经皮椎体成形术联合超声引导下竖脊肌平面阻滞在老年骨质疏松性椎体压缩骨折中的应用

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现代养生 2024年第1期24卷 19-22页

作者：宋旭东湖南省人民医院(湖南师范大学附属第一医院)疼痛科

目的探讨经皮椎体成形术（percutaneousvertebroplasty,PVP）联合超声引导下竖脊肌平面阻滞治疗老年骨质疏松性椎体压缩骨折（osteoporosis vertebral compression fracture,OVCF）的临床疗效。方法选取2021年1月-2022年12月湖南省人... 详细信息

目的探讨经皮椎体成形术（percutaneousvertebroplasty,PVP）联合超声引导下竖脊肌平面阻滞治疗老年骨质疏松性椎体压缩骨折（osteoporosis vertebral compression fracture,OVCF）的临床疗效。方法选取2021年1月-2022年12月湖南省人民医院（湖南师范大学附属第一医院）疼痛科诊断为OVCF住院患者60例，根据组间年龄、性别、体质量指数（BMI）以及累及节段等基线资料均衡可比的原则分为对照组（30例）和观察组（30例）。对照组行单纯PVP术，观察组采用PVP联合超声引导下竖脊肌平面阻滞。采集术前、术后3天、术后7天的视觉模拟评分量表（visualanalogscale,VAS）、Oswestry功能障碍指数（Oswestrydisabilityindex,ODI）以及脊柱活动度等数据。结果手术前，两组患者VAS评分比较，差异无统计学意义（P>0.05）；术后3～7天，两组患者VAS评分均明显降低；但观察组患者的VAS评分较对照组降低更明显，差异有统计学意义（P0.05）；术后3～7天，两组患者ODI均较术前明显降低，但观察组患者的ODI较对照组降低更明显，差异有统计学意义（P0.05）；术后3～7天，两组患者前屈活动度和后伸活动度均明显改善；但只有术后3天观察组患者的前屈活动度较对照组降低更明显，差异有统计学意义（P0.05）。治疗过程中，对照组和观察组未见明显相关不良反应。结论与单纯PVP术相比，PVP联合超声引导下竖脊肌平面阻滞在术后短期内能明显改善患者疼痛和日常生活能力。

关键词：经皮椎体成形术竖脊肌平面阻滞骨质疏松性椎体压缩骨折

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Physico-chemical structure evolution characteristics of coal char during gasification in the presence of iron-based waste catalyst

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International Journal of Coal Science & Technology 2020年第3期7卷 456-463页

作者： Xinsha Zhang xudong song Jiaofei Wang Weiguang Su Bing Zhou Yonghui Bai Guangsuo Yu State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan750021China CHN Energy Ningxia Coal Industry Co. Ltd.Yinchuan750000China Institute of Clean Coal Technology East China University of Science and TechnologyShanghai200237China

The present study aims to explore the physico-chemical structure evolution characteristic during Yangchangwan bituminous coal(YCW)gasification in the presence of iron-based waste catalyst(IWC).The catalytic gasification reactivity of YCW was measured by thermogravimetric analyzer.Scanning electron microscope–energy dispersive system,nitrogen adsorption analyzer and laser Raman spectroscopy were employed to analyze the char physico-chemical properties.The results show that the optimal IWC loading ratio was 5 wt%at 1000°C.The distribution of IWC on char was uneven and Fe catalyst concentrated on the surface of some chars.The specific surface area of YCW gasified semi-char decreased significantly with the increase of gasification time.i.e.,the specific surface area reduced from 382 m2/g(0 min)to 192 m2/g(3 min),meanwhile,the number of micropores and mesopores decreased sharply at the late gasification stage.The carbon microcrystalline structure of YCW gasified semi-char was gradually destroyed with the increase of gasification time,and the microcrystalline structure with small size was gradually generated,resulting in the decreasing order degree of carbon microcrystalline structure.IWC can catalyze YCW gasification which could provide theoretical guidance for industrial solid waste recycling.

关键词： Char structure Characteristic Iron-based waste catalyst Catalytic gasification

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