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Durable poly(binaphthyl-co-p-terphenyl piperidinium)-based anion exchange membranes with dual side chains

Journal of Energy Chemistry 2024年第2期89卷 324-335,I0008页

作者： weiting gao Xuelang gao Qiugen Zhang Aimei Zhu Qinglin Liu Department of Chemical&Biochemical Engineering Fujian Provincial Key Laboratory of Theoretical and Computational ChemistryThe College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina Department of Chemistry Pohang University of Science and Technology(POSTECH)Pohang 790-784South Korea

Building well-developed ion-conductive highways is highly desirable for anion exchange membranes(AEMs).Grafting side chain is a highly effective approach for constructing a well-defined phaseseparated morphological structure and forming unblocked ion pathways in AEMs for fast ion *** of side chains can further enhance phase separation due to the superhydrophobic nature of fluorine ***,their electronic effect on the alkaline stability of side chains and membranes is rarely ***,fluorine-containing and fluorine-free side chains are introduced into the polyaromatic backbone in proper configuration to investigate the impact of the fluorine terminal group on the stability of the side chains and membrane *** poly(binaphthyl-co-p-terphenyl piperidinium)AEM(QBNp TP)has the highest molecular weight and most dimensional stability due to its favorable backbone arrangement among ortho-and meta-terphenyl based ***,by introducing both a fluorinated piperidinium side chain and a hexane chain into the p-terphenyl-based backbone,the prepared AEM(QBNp TP-QFC)presents an enhanced conductivity(150.6 m S cm^(-1))and a constrained swelling at 80℃.The electronic effect of fluorinated side chains is contemplated by experiments and *** results demonstrate that the presence of strong electro-withdrawing fluorine groups weakens the electronic cloud of adjacent C atoms,increasing OH^(-)attack on the C atom and improving the stability of piperidinium *** QBNp TP-QFC possesses a robust alkaline stability at 80℃(95.3%conductivity retention after testing in 2 M Na OH for 2160 h).An excellent peak power density of 1.44 W cm^(-2)and a remarkable durability at 80℃(4.5%voltage loss after 100 h)can be observed.

关键词： Anion exchange membranes Backbone structure Fluorinated side chain Alkaline stability

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A highly reliable embedding algorithm for airborne tactical network virtualization

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Journal of Systems Engineering and Electronics 2021年第6期32卷 1364-1374页

作者： MIAO Jingcheng LYU Na CHEN Kefan CHEN Zhuo gao weiting College of Information and Navigation Air Force Engineering UniversityXi’an 710077China Unit 94860 of the PLA Nanjing 210000China

The evolution of airborne tactical networks(ATNs)is impeded by the network ossification *** a solution,network virtualization(NV)can provide a flexible and scalable architecture where virtual network embedding(VNE)is a key ***,existing VNE algorithms cannot be optimally adopted in the virtualization of ATN due to the complex interference in aircombat *** this context,a highly reliable VNE algorithm based on the transmission rate for ATN virtualization(TR-ATVNE)is proposed to adapt well to the specific electromagnetic environment of *** algorithm coordinates node and link *** the node mapping,transmission-rate resource is firstly defined to effectively evaluate the ranking value of substrate nodes under the interference of both environmental noises and enemy ***,a feasible splitting rule is proposed for path splitting in the link mapping,considering the interference between wireless *** results reveal that our algorithm is able to improve the acceptance ratio of virtual network requests while maintaining a high revenue-to-cost ratio under the complex electromagnetic interference.

关键词： airborne tactical network(ATN) network virtualization(NV) resource allocation virtual network embedding(VNE) transmission rate

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Thermal effects on fracture toughness of cracked straight-through Brazilian disk green sandstone and granite

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第5期14卷 1447-1460页

作者： Lei Zhou weiting gao Liyuan Yu Zheming Zhu Jianxing Chen Xingkai Wang Key Laboratory of Deep Earth Science and Engineering Ministry of EducationSichuan UniversityChengdu610065China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan ProvinceSichuan UniversityChengdu610065China Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province Shaoxing UniversityShaoxing312000China

Cracked straight-through Brazilian disc(CSTBD) samples prepared using two rock materials were used for thermal treatment from room temperature to 700℃. Uniaxial splitting experiments were performed using an automatic electro-hydraulic servo press to study the evolution laws of physical and fracture properties of different deep rock materials under high-temperature geological conditions. The fracture characteristics were measured using an industrial camera and digital image correlation technology to analyze the effect of high temperature on fracture properties and failure modes of the CSTBD samples after different thermal treatments. The micro-damage properties of green sandstone and granite materials were obtained using a scanning electron microscope(SEM). The following conclusions were drawn from the test results:(1) With the increasing temperature, the fracture characteristics of green sandstone and granite change from brittle fracture to plasticity fracture, the longitudinal wave velocity of granite decreases sharply at 600℃, and the damage factor reaches 0.8748 at 700℃.(2) The fracture toughness of green sandstone and granite decreases with increasing temperature;however, the decreasing range of granite is larger than that of green sandstone.(3) As the temperature increases, the fracture morphologies of green sandstone and granite materials become rougher, whereas thermal damage cracks of granite and intergranular fractures inside sandstone as well as pores of sandstone increase.(4) The crack tip opening displacement and peak strain corresponding to peak load increase with the temperature.

关键词： High temperature Cracked straight-through Brazilian disc(CSTBD)sample Fracture toughnessm Scanning electron microscope(SEM)

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Parameter calibration of the tensile-shear interactive damage constitutive model for sandstone failure

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1153-1174页

作者： Yun Shu Zheming Zhu Meng Wang weiting gao Fei Wang Duanying Wan Yuntao Wang MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu610065China Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan ProvinceSichuan UniversityChengdu610065China Tianfu Engineering-oriented Numerical Simulation & Software Innovation Center Chengdu620107China

The tensile-shear interactive damage(TSID)model is a novel and powerful constitutive model for rock-like *** study proposes a methodology to calibrate the TSID model parameters to simulate *** basic parameters of sandstone are determined through a series of static and dynamic tests,including uniaxial compression,Brazilian disc,triaxial compression under varying confining pressures,hydrostatic compression,and dynamic compression and tensile tests with a split Hopkinson pressure *** on the sandstone test results from this study and previous research,a step-by-step procedure for parameter calibration is outlined,which accounts for the categories of the strength surface,equation of state(EOS),strain rate effect,and *** calibrated parameters are verified through numerical tests that correspond to the experimental loading *** between numerical results and experimental data indicates the precision and reliability of the calibrated *** methodology presented in this study is scientifically sound,straightforward,and essential for improving the TSID ***,it has the potential to contribute to other rock constitutive models,particularly new user-defined models.

关键词： Damage constitutive model Parameter calibration Rock modeling Sandstone Dynamic impact load Tensile-shear interactive damage(TSID)model

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Coupled GIMP and CPDI material point method in modelling blast-induced three-dimensional rock fracture

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International Journal of Mining Science and Technology 2022年第5期32卷 1097-1114页

作者： Duanying Wan Meng Wang Zheming Zhu Fei Wang Lei Zhou Ruifeng Liu weiting gao Yun Shu Hu Xiao MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065China Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan ProvinceSichuan UniversityChengdu 610065China State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resources and HydropowerSichuan UniversityChengdu 610065China College of Civil and Architecture Engineering Panzhihua UniversityPanzhihua 617099China

Three-dimensional rock fracture induced by blasting is a highly complex problem and has received considerable attention in geotechnical *** material point method is firstly applied to treat this challenging *** inherent weaknesses can be overcome by coupling the generalized interpolation material point(GIMP)and the convected particle domain interpolation technique(CPDI).For the media in the borehole,unchanged GIMP-type particles are used to guarantee a homogenous blast *** type particles are employed to avoid the fake numerical fracture near the borehole for the rock material.A blasting experiment using three-dimensional single-borehole rock was simulated to examine the applicability of the coupled model under realistic loading and boundary conditions.A good agreement was achieved between the simulation and experimental ***,the mechanism of three-dimensional rock fracture was *** was concluded that rock particle size and material parameters play an important role in rock *** reflected tensile waves cause severe damage in the lower part of the *** waves occur on the top face of the rock model to induce a hoop failure band.

关键词： Material point method(MPM) Convected particle domain interpolation (CPDI) Generalized interpolation material point (GIMP) Rock fracture Blast

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人工智能时代职业院校教师数字胜任力评价指标体系构建

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职业技术教育 2023年第2期44卷 74-79页

作者：高维婷河北工艺美术职业学院保定071000

人工智能时代下构建职业院校教师数字胜任力评价指标体系,是提升职业院校教师素养的必然要求,亦是打造智慧课堂的实然取向,更是制订数字教材质量标准的应然选择。基于现有教师数字胜任力相关研究成果,遵循科学性、合理性和创新性原则,... 详细信息

人工智能时代下构建职业院校教师数字胜任力评价指标体系,是提升职业院校教师素养的必然要求,亦是打造智慧课堂的实然取向,更是制订数字教材质量标准的应然选择。基于现有教师数字胜任力相关研究成果,遵循科学性、合理性和创新性原则,邀请企业数字化教育平台管理领域和职业教育领域的15名专家,采用问卷调查法和访谈法采纳专家意见,最终系统构建包含4个一级指标、15个二级指标以及55个三级指标的职业院校教师数字胜任力评价指标体系。基于该指标体系的方向指引性及职业院校教师数字胜任力实际,提出职业院校教师数字胜任力提升举措:应创设数字教学技能培训体系,夯实教师数字知识与技能;制订教育教学智能化实训方案,优化教师数字教学实践能力;搭建创新思维培育系统,锻造教师高阶数字思维能力;设立基础能力多方协同培育模式,升级教师基础数字认知。

关键词：人工智能时代教师数字胜任力评价指标体系职业院校

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低RCS目标检测的制导雷达波形优化方法

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华中科技大学学报（自然科学版） 2019年第2期47卷 41-46页

作者：翁木云郑家毅李伟高维廷空军工程大学信息与导航学院陕西西安710077

提出了一种基于局部最大势-相对熵(LMP-KLD)的制导雷达波形设计方法.该方法基于低雷达散射截面积(RCS)目标特性和压制干扰等条件,构建了局部最大势(LMP)检测器,推导了影响检测器性能的偏移系数,从相对熵(KLD)的角度分析了偏移系数,建立... 详细信息

提出了一种基于局部最大势-相对熵(LMP-KLD)的制导雷达波形设计方法.该方法基于低雷达散射截面积(RCS)目标特性和压制干扰等条件,构建了局部最大势(LMP)检测器,推导了影响检测器性能的偏移系数,从相对熵(KLD)的角度分析了偏移系数,建立偏移系数与KLD间的关系模型,然后利用极值点法在频域分配信号能量并确定发射信号频域表达式.仿真实验结果表明:当虚警概率为1×10-3时,通过波形优化算法设计的波形获得的检测概率比传统方法设计的波形提高了0.38.

关键词：波形设计制导雷达低雷达散射截面积目标干扰局部最大势检测

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动荷载下岩石裂纹动态扩展行为实验研究综述

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爆炸与冲击 2023年第8期43卷 1-27页

作者：高维廷朱哲明朱伟邹明四川大学建筑与环境学院深地科学与工程教育部重点实验室四川成都610065

岩石的动态裂纹扩展特性在岩石力学和岩石工程研究中具有重要意义。动荷载下岩石中裂纹的扩展行为是瞬间发生的,这对实验中测试和加载技术具有很大的挑战性。为综述动荷载下岩石材料裂纹扩展研究取得的丰硕成果,总结了岩石动态裂纹扩展... 详细信息

岩石的动态裂纹扩展特性在岩石力学和岩石工程研究中具有重要意义。动荷载下岩石中裂纹的扩展行为是瞬间发生的,这对实验中测试和加载技术具有很大的挑战性。为综述动荷载下岩石材料裂纹扩展研究取得的丰硕成果,总结了岩石动态裂纹扩展测试技术、实验设备和实验方法等方面的最新进展。首先,讨论了动态岩石裂纹扩展测试的各种测量技术(X射线计算机断层扫描技术、焦散线法、数字图像相关法、裂纹扩展计、导电碳膜测试方法、声发射);然后,以应变率为主线,从低到高依次总结了中低应变率、高应变率和超高应变率下岩石内裂纹动态扩展行为研究,系统讨论了落锤冲击装置、霍普金森压杆、爆炸实验中对裂纹扩展测试的实验方法和动态裂纹扩展特性,总结了不同应变率条件下岩石裂纹的起裂、扩展、止裂及动态断裂韧度等的演变规律。

关键词：岩石材料应变率动态测试动态加载裂纹扩展动态断裂韧度

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支持混合业务传输的蜂群无人机自组网多路访问控制协议

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兵工学报 2019年第4期40卷 820-828页

作者：刘炜伦张衡阳郑博高维廷空军工程大学信息与导航学院陕西西安710077

针对蜂群无人机自组网多优先级业务并行传输,以及高优先级业务低时延、高可靠的服务质量(QoS)需求,提出一种支持混合业务传输的多路访问控制(MAC)协议。该协议针对混合业务的QoS需求,对最高优先级业务采用多信道随机接入策略,其余优先... 详细信息

针对蜂群无人机自组网多优先级业务并行传输,以及高优先级业务低时延、高可靠的服务质量(QoS)需求,提出一种支持混合业务传输的多路访问控制(MAC)协议。该协议针对混合业务的QoS需求,对最高优先级业务采用多信道随机接入策略,其余优先级采用多信道忙闲接入策略,根据阈值和信道占用度对未超时分组的接入权限实时控制,并通过基于信道忙闲感知的多优先级退避机制,为各优先级业务提供了QoS保障能力。进一步综合运用排队理论、Markov建模、离散Laplace变换推导出了系统各项性能的数学表达式和各优先级业务信道接入阈值。仿真结果表明,该协议在重负载下能够有效保障高优先级业务低时延( 99%)的QoS需求及稳定的系统容量(> 10 Mbit/s),性能优于区分优先级自适应抖动的多信道MAC协议和基于传输时隙分配和即时访问的混合MAC协议。

关键词：蜂群无人机混合业务信道占用度阈值多路访部控制协议自组网退避

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基于时空图卷积网络的无人机网络入侵检测方法

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北京航空航天大学学报 2021年第5期47卷 1068-1076页

作者：陈卓吕娜陈坤张彦晖高维廷空军工程大学信息与导航学院西安710077

无人机网络相比地面网络具有节点快速移动、拓扑结构变换频繁和通信链路不可靠的特点,传统的针对地面网络的入侵检测方法难以适用。针对无人机网络的时空动态特性进行建模,提出了一种无人机网络的入侵检测方法———基于注意力机制的时... 详细信息

无人机网络相比地面网络具有节点快速移动、拓扑结构变换频繁和通信链路不可靠的特点,传统的针对地面网络的入侵检测方法难以适用。针对无人机网络的时空动态特性进行建模,提出了一种无人机网络的入侵检测方法———基于注意力机制的时空图卷积网络(ATGCN)。将图卷积网络和门控递归单元组合为时空图卷积网络,从复杂多变的数据中提取网络的时空演变特征,通过注意力机制提取和入侵检测最相关的特征,输入支持向量机进行分类预测。多个数据集的实验分析表明:所提方法能够适应无人机网络的动态性和不稳定性,相比传统检测方法准确率高且误报率低,具有良好的鲁棒性和适应性。

关键词：无人机网络入侵检测图卷积网络门控递归单元注意力机制

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