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Switchable shape memory polymer bio-inspired adhesive and its application for unmanned aerial vehicle landing

Chinese Journal of Aeronautics 2024年第3期37卷 380-390页

作者： Qingsong HE Zefang ZHAO Qiyun ZHONG Siyuan liu Kai DENG yongqi liu Ning ZHANG Zijie ZHAO Fengjiang ZHAN Jianfeng ZHAO Jiangsu Provincial Key Laboratory of Bionic Functional Materials College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory of Advanced Technology for Small and Medium-Sized UAV Ministry of Industry and Information TechnologyUnmanned Aerial Vehicles Research InstituteNanjing University of Aeronautics and AstronauticsNanjing 210016China State Key Laboratory of Mechanics and Control of Aerospace Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Functional Morphology and Biomechanics Institute of ZoologyKiel UniversityKiel 24098Germany

Controlled and switchable adhesion is commonly observed in biological *** recent years,many scholars have focused on making switchable bio-inspired ***,making a bio-inspired adhesive with high adhesion performance and excellent dynamic switching properties is still a challenge.A Shape Memory Polymer Bio-inspired Adhesive(SMPBA)was successfully developed,well realizing high adhesion(about 337 kPa),relatively low preload(about90 kPa),high adhesion-to-preload ratio(about 3.74),high switching ratio(about 6.74),and easy detachment,which are attributed to the controlled modulus and contact area by regulating temperature and the Shape Memory Effect(SME).Furthermore,SMPBA exhibits adhesion strength of80–337 kPa on various surfaces(silicon,iron,and aluminum)with different roughness(Ra=0.021–10.280)because of the conformal contact,reflecting outstanding surface *** finite element analysis verifies the bending ability under different temperatures,while the adhesion model analyzes the influence of preload on contact area and ***,an Unmanned Aerial Vehicle(UAV)landing device with SMPBA was designed and manufactured to achieve UAV landing on and detaching from various *** study provides a novel switchable bio-inspired adhesive and UAV landing method.

关键词： Bio-inspired adhesive Shape memory polymers Switchable adhesive Unmanned aerial vehicle Landing

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Online Capacitor Voltage Transformer Measurement Error State Evaluation Method Based on In-Phase Relationship and Abnormal Point Detection

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Smart Grid and Renewable Energy 2024年第1期15卷 34-48页

作者： yongqi liu Wei Shi Jiusong Hu Yantao Zhao Pang Wang College of Railway Transportation Hunan University of Technology Zhuzhou China Wasion Group Co. Ltd. Changsha China

The assessment of the measurement error status of online Capacitor Voltage Transformers (CVT) within the power grid is of profound significance to the equitable trade of electric energy and the secure operation of the power grid. This paper advances an online CVT error state evaluation method, anchored in the in-phase relationship and outlier detection. Initially, this method leverages the in-phase relationship to obviate the influence of primary side fluctuations in the grid on assessment accuracy. Subsequently, Principal Component Analysis (PCA) is employed to meticulously disentangle the error change information inherent in the CVT from the measured values and to compute statistics that delineate the error state. Finally, the Local Outlier Factor (LOF) is deployed to discern outliers in the statistics, with thresholds serving to appraise the CVT error state. Experimental results incontrovertibly demonstrate the efficacy of this method, showcasing its prowess in effecting online tracking of CVT error changes and conducting error state assessments. The discernible enhancements in reliability, accuracy, and sensitivity are manifest, with the assessment accuracy reaching an exemplary 0.01%.

关键词： Capacitor Voltage Transformer Measurement Error Online Monitoring Principal Component Analysis Local Outlier Factor

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A novel traditional Chinese medicine combination for radiation

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Radiation Medicine and Protection 2024年第1期5卷 37-42页

作者： Ming Shang Yicheng Ke Jiangyun liu Zhifei Cao Liying Zhang Wenyang Zhang Weiwei Pei Guangming Zhou yongqi liu Provincial-Level Key Laboratory for Molecular Medicine of Major Diseases and the Prevention and Treatment with Traditional Chinese Medicine Research in Gansu Colleges and Universities Gansu University of Chinese MedicineLanzhou 730000China School of Radiation Medicine and Protection Medical College of Soochow UniversitySuzhou 215123China Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions Suzhou 215123China College of Pharmaceutical Sciences Soochow UniversitySuzhou 215123China Department of Pathology The Second Affiliated HospitalMedical College of Soochow UniversitySuzhou 215123China

Objective:To formulate an efficacious radioprotective combination of Chinese medicines with minimal ***:Aqueous and alcoholic extracts from 38 traditional Chinese herbs were *** produce drugcontaining sera,rats received six doses of each extract via oral gavage at 12-h ***,human lung epithelial BEAS-2B cells were cultured in these drug-containing *** cell viability was assessed after different doses of irradiation to identify the radioprotective effects of Chinese herbal *** efficacy of a selected Chinese herbal extract combination was further confirmed through cell viability analysis via in vitro colony formation and survival rate assessments in C57BL/6 mice ***:Extracts from Angelicae Sinensis Radix(ASR;two extracts),Citri Reticulatae Pericarpium(CRP),Platycladi Cacumen(PC),Schisandrae chinensis Fructus(SF),Scutellariae Radix(SR),and Glycyrrhizae Radix et Rhizome(GRR)demonstrated radioprotective *** combination of the seven Chinese herbal extracts notably increased the survival and viability of the BEAS-2B cells exposed to varying doses of ***,the group of mice receiving Chinese medicine combination and irradiation exhibited prolonged survival after exposure to 6.5 Gy Xrays with a median survival of(14=2)d compared to(11=2)d in the irradiated group without the herbal ***,the Chinese medicine combination group displayed a significantly higher 28 d survival rate(30%)compared to the irradiation-only group(16.6%,P<0.05).Conclusion:The novel combination of Chinese herbal extracts from ASR,CRP,PC,SF,SR,and GRR has the potential for radiation protection applications.

关键词： Radiation protection Acute radiation syndrome Chinese medicine Drug-containing serum

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大型交流励磁变速抽水蓄能机组技术特征与研制框架

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电网技术 2024年第6期48卷 2366-2375,I0036页

作者：陈龙翔乐振春刘永奇国家电网有限公司北京市西城区100031

交流励磁变速抽水蓄能是国际上应用最广泛成熟的变速机组技术路线,是中国抽水蓄能发展需要重点攻克的关键技术。当前,国内大型交流励磁变速抽水蓄能技术自主化工程研制和应用仍处于起步阶段,从电机设计、变频系统设计到机网协调控制策... 详细信息

交流励磁变速抽水蓄能是国际上应用最广泛成熟的变速机组技术路线,是中国抽水蓄能发展需要重点攻克的关键技术。当前,国内大型交流励磁变速抽水蓄能技术自主化工程研制和应用仍处于起步阶段,从电机设计、变频系统设计到机网协调控制策略等方面关键技术都亟待突破。为进一步攻克交流励磁变速抽水蓄能关键技术、理清研发重点,该文首先从抽水蓄能技术基本原理出发,概括不同抽水蓄能技术路线的特点和适用条件。然后,重点分析了交流励磁变速抽水蓄能机组的技术特征,提出了交流励磁变速发电电动机、水泵水轮机、变频器等核心装备的研制框架和重点。最后,给出交流励磁变速机组研制的思考和总体方法。

关键词：抽水蓄能变速机组交流励磁技术特征装备研发重点

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基于激光熔覆的缸套表面梯度材料制备及其摩擦学性能研究

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表面技术 2024年第7期53卷 40-47页

作者：刘永琪袁成清饶响郭智威武汉理工大学交通与物流工程学院武汉430063 武汉理工大学水路交通控制全国重点实验室武汉430063 国家水运安全工程技术研究中心可靠性工程研究所武汉430063

目的研究功能梯度材料对缸套表面的抗磨减摩作用,提升缸套-活塞环配副的摩擦学性能。方法通过激光打标机在缸套表面制备具有30°角规则纹理排布的凹槽,在凹槽内采用同轴送粉的方式熔覆镍含量不同的铁基粉末,分析熔覆合金层的金相组织,... 详细信息

目的研究功能梯度材料对缸套表面的抗磨减摩作用,提升缸套-活塞环配副的摩擦学性能。方法通过激光打标机在缸套表面制备具有30°角规则纹理排布的凹槽,在凹槽内采用同轴送粉的方式熔覆镍含量不同的铁基粉末,分析熔覆合金层的金相组织,并利用往复式摩擦磨损试验机研究在一定载荷压力下功能梯度材料缸套的摩擦学性能。结果熔覆层金相组织呈现梯度排布,熔覆层与基体材料分子原子交互扩散形成良好的冶金结合。牌号为350、镍质量分数为4.2%、铁质量分数80%的粉末所制备的功能梯度材料,减摩效果最为明显,相比未经处理的对照组,平均摩擦因数降幅为25.4%,且该组在试验中接触电阻的平均值最大,相比对照组提升了63.45%。牌号为330、镍质量分数为9%、铁质量分数为70%的粉末制备的缸套,表面支撑指数最高为0.78,相比于未处理的对照组,增幅达到35%,且试验组活塞环经摩擦后,磨损量均小于对照组。结论制备了30°角分布的功能梯度材料,能使得缸套-活塞环摩擦学系统在工作过程中摩擦副的润滑油膜厚度更厚,且在运行过程中更稳定,以减少摩擦力和降低摩擦因数。同时,增强其支撑能力和储存润滑油的能力,使所制备的缸套摩擦因数显著降低。牌号为350的材料,改善摩擦学性能的效果最优。

关键词：功能梯度材料缸套-活塞环激光熔覆摩擦特性金相组织

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Global Dynamics for an HIV Infection Model with Crowley-Martin Functional Response and Two Distributed Delays

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Journal of Systems Science & Complexity 2018年第2期31卷 385-395页

作者： liu yongqi WU Chunsong College of Applied Mathematics Beijing Normal University Zhuhai 519087 China College of Mathematics and Information Science Henan Normal University Xinxiang 453007 China.

In this paper, an HIV dynamics model with two distributed intracellular delays incorporating Crowley-Martin functional response infection rate is investigated. The authors take into account multiple stage disease transmission and the latently infected cells（not yet producing virus） in our system. The authors consider nonnegativity, boundedness of solutions, and global asymptotic stability of the system. By constructing suitable Lyapunov functionals and using the Lyapunov-La Salle invariance principle, the authors prove the global stability of the infected（endemic） equilibrium and the diseasefree equilibrium for time delays. The authors have proven that if the basic reproduction number R_0 is less than unity, then the disease-free equilibrium is globally asymptotically stable, and if R_0 is greater than unity, then the infected equilibrium is globally asymptotically stable. The results obtained show that the global dynamic behaviors of the model are completely determined by the basic reproduction number R_0 and that the time delay does not affect the global asymptotic properties of the model.

关键词： Crowley-Martin functional response distributed delays global stability analysis HIV model.

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混合改进麻雀算法解决柔性车间调度问题

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建模与仿真 2024年第4期13卷 4912-4926页

作者：刘泳棋刘媛华上海理工大学管理学院上海

针对柔性作业车间调度问题(flexible job shop scheduling problem,FJSP),提出一种混合改进麻雀算法对其求解,旨在求得最小最大完工时间。首先,采用基于极限调度完工时间最小化的工序机器双层编码方式初始化,解决FJSP离散化问题;其次,... 详细信息

针对柔性作业车间调度问题(flexible job shop scheduling problem,FJSP),提出一种混合改进麻雀算法对其求解,旨在求得最小最大完工时间。首先,采用基于极限调度完工时间最小化的工序机器双层编码方式初始化,解决FJSP离散化问题;其次,用多种策略改进麻雀算法,在跟随者阶段采用LEVY飞行、自适应参数调整进行改进,跟随者阶段融入鲸鱼螺旋狩猎行为,并采用柯西扰动等方法提高求解质量,加大勘测搜索空间;然后,引入遗传算子加强算法跳出局部最优的能力;最后,根据标准算例数据和实际车间生产数据对算法进行仿真模拟,证明了应用混合改进麻雀算法在求解FJSP问题的可行性、优越性和高效性,助力车间的智能化管控。

关键词：混合改进麻雀算法柔性车间调度问题遗传算法鲸鱼优化算法 LEVY飞行策略柯西扰动

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静电发射器对微米级金属单颗粒的供应特性研究

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推进技术 2024年第9期45卷 174-183页

作者：王旭王天龙刘永祺徐旭杨庆春北京航空航天大学宇航学院北京100191 北京航空航天大学沈元学院北京100191

为了对静电发射器的单颗粒供应特性进行系统性的研究,搭建了一套运动粒子可视化观测系统,并针对不同极板间电场强度、载气流量、几何结构和粒子直径条件下的发射器单颗粒供应特性进行了详细的研究分析。结果表明:利用静电场弥散颗粒群后... 详细信息

为了对静电发射器的单颗粒供应特性进行系统性的研究,搭建了一套运动粒子可视化观测系统,并针对不同极板间电场强度、载气流量、几何结构和粒子直径条件下的发射器单颗粒供应特性进行了详细的研究分析。结果表明:利用静电场弥散颗粒群后,通过极低流量载气进行输运的颗粒发生装置可以稳定且连续的出射微米级金属单颗粒。通过提高电场强度、载气流量和扩大出口孔径,能够有效缩短粒子的出射时间间隔。其中极板间电场强度在影响粒子出射时间间隔上占主导地位,并且两者间具有较好的线性关系。在本文测试范围内,通过改变电场强度可以实现出射粒子平均时间间隔在180~1 100 ms内线性可调,同时单颗粒率保持在80%以上。为了稳定和高效的为燃烧试验供应单颗粒,建议粒子发射器的出口孔径不宜小于0.5 mm,载气流量不宜超过16 ml/min。

关键词：静电发射器颗粒弥散单颗粒供应特性金属燃料静电场

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Selective preparation of light aromatic hydrocarbons from catalytic fast pyrolysis vapors of coal tar asphaltene over transition metal ion modified zeolites

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Chinese Journal of Chemical Engineering 2021年第7期34卷 275-287页

作者： yongqi liu Qiuxiang Yao Ming Sun Xiaoxun Ma School of Chemical Engineering Northwest UniversityInternational Science&Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon ResourcesChemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei EnergyShaanxi Research Center of Engineering Technology for Clean Coal ConversionCollaborative Innovation Center for Development of Energy and Chemical Industry in Northern ShaanxiXi’an 710069China

The catalytic cracking of coal tar asphaltene(CTA)pyrolysis vapors was carried out over transition metalion modified zeolites to promote the generation of light aromatic hydrocarbons(L-ArHs)in a pyrolysisgas chromatography/mass spectrometry(Py-GC/MS)micro-reactor *** effects of ultra stable Y(USY),Co/USY and Mo/USY on the selectivity and yield of L-ArHs products and the extent of deoxygenation(Edeoxygenation),lightweight(Elightweight)from CTA pyrolysis volatiles were *** showed that the yields of L-ArHs are mainly controlled by the acid sites and specific surface area of the catalysts,while the deoxygenation effect is determined by theirs pore *** Eligltweight of CTA pyrolysis volatiles over USY is 9.65%,while the Edeoxygenation of CTA pyrolysis volatiles over Mo/USY reaches 20.85%.Additionally,the modified zeolites(Mo/USY and Co/USY)exhibit better performance than USY on L-ArHs production,owing to the synergistic effect of metal ions(Mo,Co)and acid sites of *** with the non-catalytic fast pyrolysis of CTA,the total yield of L-ArHs obtained over USY(4032 mg·kg^(-1)),Co/USY(4363 mg·kg^(-1))and Mo/USY(4953 mg·kg^(-1))were increased by 27.03%,38.19%and 54.78%,***,the possible catalytic conversion mechanism of transition metal ion(Co and Mo)modified zeolites was proposed based on the distribution of products and the characterizations of catalysts.

关键词： Coal tar asphaltene Transition metal ion modification Deoxygenation Lightweight Light aromatic compounds

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乡村振兴背景下黑龙江省农业发展中投融资问题研究

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经济研究导刊 2024年第8期 35-38页

作者：刘从敏刘永旗时怡哈尔滨商业大学哈尔滨150028

黑龙江省是农业大省。党的十九大提出了乡村振兴战略。要大力发展现代化农业和农村就离不开大量生产要素的投入,尤其是长期和大规模的资金投入。近年来,黑龙江省乡村振兴投融资规模不断扩大,新兴投资主体不断增多,投融资模式不断创新,... 详细信息

黑龙江省是农业大省。党的十九大提出了乡村振兴战略。要大力发展现代化农业和农村就离不开大量生产要素的投入,尤其是长期和大规模的资金投入。近年来,黑龙江省乡村振兴投融资规模不断扩大,新兴投资主体不断增多,投融资模式不断创新,但金融支持体系仍不够完善,社会资金难以注入,金融服务水平有待提高,农业缺乏稳定的资金支持,且监管不足。通过对当前黑龙江省乡村振兴投融资中所面临的问题进行分析,探究新型乡村振兴投融资体系路径选择,以推动黑龙江省农业和农村以及相关产业的全面可持续发展。

关键词：投融资乡村振兴黑龙江省

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