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Insight into the change in carbon structure and thermodynamics during anthracite transformation into graphite

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International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 162-172页

作者： tian Qiu Jian-guo Yang Xue-jie bai National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China

The thermodynamic and kinetic mechanisms of Taixi anthracite during its graphitization process were *** understand the variation trends of carbon arrangement order,microcrystal size,and graphitization degree against temperature during the graphitization process,a series of experiments were performed using Raman spectroscopy and X-ray diffraction(XRD).Subsequently,the influencing factors of the dominant reaction at different temperatures were analyzed using thermodynamics and *** results showed that the graphitization process of Taixi anthracite can be divided into three stages from the perspective of reaction thermodynamics and *** played a crucial role in the formation and growth of a graphitic ***,multivariate mechanisms coexisted in the graphitization *** ultrahigh temperatures,the defects of synthetic graphite could not be completely eliminated and perfect graphite crystals could not be *** low temperatures,the reaction is mainly controlled by dynamics,while at high temperatures,thermodynamics dominates the direction of the reaction.

关键词： anthracite graphitization thermodynamics kinetics

Conceptual design and configurations selection of S/H-UAVs based on Q-rung dual hesitant double layer FQFD

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Chinese Journal of Aeronautics 2024年第9期37卷 193-205页

作者： Dun YANG Li LIU Wencan bai Weiyong tian School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

For the conceptual design phase of Unmanned Aerial Vehicles(UAVs),a process for conceptual design and configuration selection of Solar/Hydrogen powered UAVs(S/H-UAVs)is *** design requirements of S/H-UAVs were analyzed *** proposed process used Fuzzy Quality Function Deployment(FQFD)to establish logical and quantitative ***,in order to appropriately describe the hesitancy of experts while making decision,it used Q-Rung Dual Hesitant Fuzzy Sets(QRDHFS)to score the *** addition,a decision-making framework is proposed to perform a logical selection of typical layouts based on defuzzi-fication method and Technique for Order Preference by Similarity to the Ideal Solution(TOPSIS).The present process has been applied for S/*** resulting set of design requirements con-sists of three categories:Mission Requirements(MRs),Engineering Characteristics(ECs)and Tech-nical Indicators(TIs).Four typical layouts of S/H-UAVs were sorted and *** performance of four typical layouts were evaluated and the Strut-Braced Wing(SBW)with external hydrogen storage was selected as the best layout for S/H-UAVs.

关键词： Hybrid powered UAV Conceptual design Q-Rung Dual Hesitant Fuzzy Set(QRDHFS) Quality function deployment Strut-braced wing

Detrital zircon U-Pb dating in the southern Hefei Basin: Evidence for exhumation of HP-UHP rocks of the Dabie Orogen

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Science China Earth Sciences 2020年第7期63卷 954-968页

作者： Yongsheng WANG Qiao bai Ziqiang tian Hui DU School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China

The Hefei Basin of eastern China developed in response to uplift of the Dabie Orogen,and zircon dating can be used to assess the exhumation history of the *** were collected from samples of the Lower Jurassic Fanghushan Formation and Middle Jurassic Sanjianpu Formation in the southern Hefei Basin,and mica-quartz schist and biotite granite gneiss from the Susong Complex of the Dabie *** zircon U-Pb dating was undertaken using laser ablation-inductively coupled plasma-mass *** detrital zircons from conglomerates of the Fanghushan Formation and from clasts within the conglomerates have age-frequency distributions with the main clusters between 2.0 and 1.8 Ga,similar to age data of the Susong *** the other hand,the zircons of the Fanghushan Formation do not show the age cluster at 1000–900 Ma that characterizes zircons in the underlying metasediments of the lower Paleozoic Foziling Group.A cluster of Triassic zircon ages also appears in the arkosic sandstones of the Fanghushan *** data indicate that the provenance of the Fanghushan Formation was a mixture of high-pressure(HP)and ultrahigh-pressure(UHP)Triassic metamorphic rocks,Paleozoic magmatic rocks,and the Susong Complex,but not the lower Paleozoic Foziling Group even though it directly underlies the sediments of the Hefei *** samples from the Sanjianpu Formation show zircon age clusters at 797 and 791 Ma(middle Neoproterozoic)and 226 Ma(Triassic),and again,these are markedly different from the age clusters that characterize the Foziling *** seems,therefore,that despite the Foziling Group being at the surface in the underwater depositional area of the Hefei Basin,it was not exposed in the source area of the Hefei basinal sediments during the Jurassic,and there are two possible reasons for ***,the exhumation of the Dabie Orogen was directed partly towards the north,in the process of which some of the Foziling Group was ***,the Susong Compl

关键词： Dabie Orogen Exhumation of HP-UHP rocks Hefei Basin Lower-Middle Jurassic Zircon dating

Numerical Simulation of Dilute Phase Transportation in Pulse Riser

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China Petroleum Processing & Petrochemical Technology 2021年第4期23卷 130-140页

作者： An Xiaoxi Yang ze Qiao Yingyun tian Yuanyu Key Laboratory of Low Carbon Energy and Chemical Engineering Shandong University of Science and TechnologyQingdao 266590 State Key Laboratory of Heavy Oil Processing China University of PetroleumQingdao 266580

To study the hydrodynamic characteristics of gas-solid-phase flow in a pulse riser,a dense discrete particle model considering particle collisions and solid volume fraction is *** core-annular flow in the enlarged-diameter section of the pulse riser is described,which can be destroyed with a high superficial gas *** particle trajectory crossing effect and particle-particle and particle-wall collisions in the reduced-diameter section of the pulse riser can also destroy the core-annular flow and enhance the gas-solid *** solid volume fraction exhibits an S-type distribution at different solid mass *** distribution of axial velocity,radial velocity,and relative slip velocity is investigated by analyzing the simulated results at different pulse riser diameter ratios.A suitable pulse riser diameter ratio can improve the performance of the pulse riser.

关键词： numerical simulation fluidized bed entrained flow bed pyrolysis-gasification

lncRNA-TNFRSF13C调控miR-1246对牙周细胞低氧诱导因子1α的作用

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中国组织工程研究 2025年第5期29卷 928-935页

作者：白静张雪任燕李月辉田晓宇唐山中心医院口腔科河北省唐山市063000 唐山市丰润区人民医院河北省唐山市063000 开滦(集团)有限责任公司唐家庄医院河北省唐山市063000 遵化市人民医院河北省遵化市064200

背景:LncRNA-TNFRSF13C是B细胞发育和功能中的一个重要因子,在牙周炎患者牙周组织中高表达,但具体机制还不清楚。目的:探讨lncRNA-TNFRSF13C调控miR-1246对牙周细胞低氧诱导因子1α的作用机制。方法:人牙周膜细胞经过脂多糖处理后分为7... 详细信息

背景:LncRNA-TNFRSF13C是B细胞发育和功能中的一个重要因子,在牙周炎患者牙周组织中高表达,但具体机制还不清楚。目的:探讨lncRNA-TNFRSF13C调控miR-1246对牙周细胞低氧诱导因子1α的作用机制。方法:人牙周膜细胞经过脂多糖处理后分为7组:A组(无转染的人牙周膜细胞株)、B组(人牙周膜细胞株转染TNFRSF13C NC-siRNA)、C组(人牙周膜细胞株转染TNFRSF13C-siRNA)、D组(人牙周膜细胞株转染miR-1246 mimics)、E组(人牙周膜细胞株转染miR-1246 siRNA)、F组(人牙周膜细胞株转染TNFRSF13C-siRNA+miR-1246 mimics)及G组(人牙周膜细胞株转染TNFRSF13C-siRNA+miR-1246 siRNA)。采用qRT-PCR检测各组细胞lncRNA-TNFRSF13C、miR-1246相对表达;CCK-8检测细胞活性;流式细胞仪检测细胞凋亡率;免疫印迹检测细胞中低氧诱导因子1α、血管内皮生长因子蛋白的表达;Pearson分析lncRNA-TNFRSF13C与miR-1246相关性,双荧光素酶分析靶向关系。结果与结论:①A、B两组人牙周膜细胞活性、凋亡率及蛋白指标比较差异均无显著性意义(P>0.05),与B组相比,C组细胞活性升高、凋亡率及低氧诱导因子1α、血管内皮生长因子蛋白降低(P<0.05),与C组相比,D组细胞活性降低,凋亡率及低氧诱导因子1α、血管内皮生长因子蛋白均升高(P<0.05),D组相比,E组细胞活性升高(P<0.05),F组细胞活性低于E组,E、F组细胞凋亡率降低(P<0.05),与F组相比,G组细胞活性升高、凋亡率及低氧诱导因子1α、血管内皮生长因子蛋白降低(P<0.05)。②lncRNA-TNFRSF13C与miR-1246呈现正相关(P<0.05)。③TNFRSF13C-siRNA组与TNFRSF13C-NC组在miR-1246-wt荧光活性降低(P<0.05);与miR-1246-NC组相比,miR-1246 mimics组低氧诱导因子1α-wt、血管内皮生长因子-wt荧光活性升高(P<0.05)。④结果说明,下调lncRNA-TNFRSF13C对脂多糖处理的牙周细胞具有促进活性、降低凋亡的作用,同时也可抑制低氧诱导因子1α、血管内皮生长因子的表达,其机制与调控miR-1246活性相关。

关键词：牙周炎牙周膜细胞脂多糖炎症 miR-1246 lncRNA-TNFRSF13C

A Multi Moving Target Recognition Algorithm Based on Remote Sensing Video

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Computer Modeling in Engineering & Sciences 2023年第1期134卷 585-597页

作者： Huanhuan Zheng Yuxiu bai Yurun tian School of Information Engineering Yulin UniversityYulinChina ZTE Communication Co. Ltd.Xi’anChina

The Earth observation remote sensing images can display ground activities and status intuitively,which plays an important role in civil and military ***,the information obtained from the research only from the perspective of images is limited,so in this paper we conduct research from the perspective of *** present,the main problems faced when using a computer to identify remote sensing images are:They are difficult to build a fixed regular model of the target due to their weak moving ***,the number of pixels occupied by the target is not enough for accurate ***,the number of moving targets is large at the same *** this case,the main targets cannot be recognized *** paper studies from the perspective of Gestalt vision,transforms the problem ofmoving target detection into the problem of salient region probability,and forms a Saliency map algorithm to extract moving *** this basis,a convolutional neural network with global information is constructed to identify and label the *** the experimental results show that the algorithm can extract moving targets and realize moving target recognition under many complex conditions such as target’s long-term stay and small-amplitude movement.

关键词： Deep learning remote sensing images moving target recognition salient

Model Implementation and Analysis of a True Three-dimensional Display System

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Computer Systems Science & Engineering 2021年第12期39卷 403-414页

作者： Ye tian Yang Yang Han Yang ze Ji Changchun University of Science and Technology Changchun130022China Tsinghua University Beijing100084China Academy of Military Sciences Beijing100166China Cardiff University CardiffCF243AAUK

To model a true three-dimensional(3D)display system,we introduced the method of voxel molding to obtain the stereoscopic imaging space of the *** the distribution of each voxel,we proposed a four-dimensional(4D)Givone–Roessor(GR)model for state-space representation—that is,we established a local state-space model with the 3D position and one-dimensional time coordi-nates to describe the ***,we extended the original elementary operation approach to a 4D condition and proposed the implementation steps of the realiza-tion matrix of the 4D GR ***,we described the working process of a true 3D display system,analyzed its real-time performance,introduced the fixed-point quantization model to simplify the system matrix,and derived the conditions for the global asymptotic stability of the system after ***,we provided an example to prove the true 3D display system’s feasibility by *** GR-model-representation method and its implementation steps proposed in this paper simplified the system’s mathematical expression and facilitated the microcon-troller software ***-time and stability analyses can be used widely to analyze and design true 3D display systems.

关键词： True 3D display system method of voxel molding(MVM) Givone-Roessor(GR)model asymptotic stability Bounded-Input Bounded-Output(BIBO)stability real-time display

有限元分析技术在膝关节生物力学应用中的特点与优势

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中国组织工程研究 2025年第15期29卷 3253-3261页

作者：郭欢萱康志杰白小龙田晓燕金凤内蒙古医科大学附属医院影像诊断科内蒙古自治区呼和浩特市010010 内蒙古医科大学研究生院内蒙古自治区呼和浩特市010010

背景:有限元分析是一种先进的计算机工程技术,利用数学近似的方法对真实人体进行模拟,可以真实反映膝关节结构内部的生物力学特征,为理解膝关节疾病发病机制、优化手术方案以及开发新型植入材料提供了有效的工具。目的:对膝关节有限元... 详细信息

背景:有限元分析是一种先进的计算机工程技术,利用数学近似的方法对真实人体进行模拟,可以真实反映膝关节结构内部的生物力学特征,为理解膝关节疾病发病机制、优化手术方案以及开发新型植入材料提供了有效的工具。目的:对膝关节有限元模型的建立及其在膝关节疾病研究中的应用进行综述,并展望了未来的发展趋势。方法:第一作者于2024年4月以“Finite Element Analysis,FEA,knee joint,Finite Element Model,Knee Biomechanics,Knee Osteoarthritis,Knee Prosthesis,Knee Ligaments,Meniscus”为英文检索词在PubMed和EI数据库进行检索,以“有限元分析,有限元模型,膝关节,生物力学,骨关节炎,计算模型,膝关节假体,膝关节韧带,半月板”为中文检索词在中国知网和万方数据库进行检索,最终纳入75篇文献进行分析。结果与结论:①有限元分析法利用医学影像数据获得三维人体模型,将复杂的人体关节结构简化为有限且相互连接的单元,通过对模型施加外部载荷,直观地显示膝关节内部的应力分布。②研究者通过有限元分析深入研究膝关节在不同工况下的内部应力和应变分布,可发现膝关节内部载荷分配平衡改变时,关节软骨的过度载荷及部分区域的负荷下降,这种长期异常应力会引起软骨变形和磨损,最终缺失,对于理解生物力学因素如何引起膝关节退行性变至关重要。③有研究通过有限元分析评估膝骨关节炎患者采用太极拳、步态调整等物理治疗方法的效果,结果显示这些治疗方法减少了软骨的过度负荷,为临床治疗提供了科学理论依据。④临床医生通过有限元分析在手术前进行三维重建、数据测量和模拟手术,能够优化手术治疗策略;此外,还可以通过模拟不同假体的力学特征,改进假体的形状、材料和固定方式,减少患者的并发症,提高患者的治疗效果。⑤人工智能与有限元分析相结合使得有限元模型的构建更为精确和易于操作,极大提高了临床医生医疗实践的效率和患者的治疗效果。⑥有限元分析仅是数字化的模拟,与真实物理状态仍存在一定差异。

关键词：膝关节关节软骨半月板生物力学有限元分析有限元模型膝骨关节炎关节置换人工智能综述

Prospective Roles of Scanning Photoelectrochemical Microscopy in Microbial Hybrid Photosynthesis

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Chinese Journal of Chemistry 2022年第24期40卷 3013-3016页

作者： Xiaochun tian Rui bai Feng Zhao CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamenFujian361021 China

Microbial hybrid photosynthesis has attracted great interests in recent years since it integrates the advantages of natural and artificial photosynthesis for solar-to-chemical conversion. Coupling a light source with scanning electrochemical microscopy, scanning photoelectrochemical microscopy (SPECM) shows great potential in investigating the interfacial reactions of microbial hybrid photosynthesis. In this Emerging Topic, the potential roles of SPECM in revealing biotic–abiotic interfacial electron transfer mechanisms and calculating electrode process kinetics are proposed for hybrid photosynthesis, and this will also inspire the applications of SPECM in the fields including biomineralization, photocatalytic-biodegradation and microbial photoelectrochemical systems.

关键词： Electron transfer Interfaces Photosynthesis Scanning electrochemical microscopy Scanning photoelectrochemical microscopy Semi-artificial photosynthesis