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近几年国际能源紧张的形势对我国能源供应的影响

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时代汽车 2024年第12期 37-39页

作者：梁峻豪海南热带海洋学院海南三亚572022

文章以疫情后几年时间,国际能源形势紧张的条件下,俄罗斯战略能源为研究背景,以中俄能源合作为研究对象,通过对相关学术文献的整理采用比较分析法以及理论联系实际等方法,阐述了中俄能源合作的历史进程,总结出近几年能源紧张的情形下对... 详细信息

文章以疫情后几年时间,国际能源形势紧张的条件下,俄罗斯战略能源为研究背景,以中俄能源合作为研究对象,通过对相关学术文献的整理采用比较分析法以及理论联系实际等方法,阐述了中俄能源合作的历史进程,总结出近几年能源紧张的情形下对中俄能源合作的积极影响和消极影响,并提出促进中俄能源发展的对策。通过分析,可知近几年来国际能源紧张形势带来的积极影响主要是使中俄能源合作的现实互补性提升,中俄能源合作领域扩大,中俄能源合作战略意义加强;消极影响是中俄能源合作环境不确定性增强,以及双方合作的潜在风险加剧。在近几年能源紧张的情况下,提出了促进中俄能源发展的对策:加强互信,优化能源合作环境;鼓励创新,丰富能源合作方式;注重沟通,完善能源合作机制。

关键词：能源危机中俄能源合作能源贸易

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基于三维点云的采后香蕉表征褐变定量评估方法

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华南农业大学学报 2024年第3期45卷 390-396页

作者：熊俊涛王雨杰洪丹梁俊浩黄启寅华南农业大学数学与信息学院广东广州510642

【目的】研究采后香蕉的表征褐变并评估其衰老程度对香蕉保鲜管理至关重要,本研究致力于解决传统人工测量香蕉表征褐变存在的劳动强度大、效率低下的问题。【方法】提出一种基于三维点云的采后香蕉表征褐变过程定量评估方法。首先利用... 详细信息

【目的】研究采后香蕉的表征褐变并评估其衰老程度对香蕉保鲜管理至关重要,本研究致力于解决传统人工测量香蕉表征褐变存在的劳动强度大、效率低下的问题。【方法】提出一种基于三维点云的采后香蕉表征褐变过程定量评估方法。首先利用三维扫描仪获取香蕉的三维点云模型,重构出香蕉的几何模型;然后使用欧式聚类对香蕉几何模型进行点云滤波降噪处理;再结合图像阈值分割法与散点轮廓算法(Alpha Shapes)求出香蕉的体积、表面积和黑斑面积;最后利用傅里叶函数对香蕉表面黑斑变化过程进行模拟,确定香蕉表征褐变过程的评估模型。设计本算法与溢水法测量实际香蕉体积、手绘测量面积的对比试验。【结果】拟合香蕉的生长函数,回归直线对观测值的拟合程度R2=0.9816>0.75,验证了算法的有效性。对比试验结果表明,本算法与实际测量值的平均相对误差小于1%,验证了该算法的准确性和可行性。【结论】本研究可为香蕉的保鲜管理提供数据及技术支撑。

关键词：三维点云数据拟合香蕉褐变保鲜

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Less is more: wiring-economical modular networks support self-sustained firing-economical neural avalanches for efficient processing

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National Science Review 2022年第3期9卷 19-31页

作者： junhao liang Sheng-Jun Wang Changsong Zhou Department of Physics Centre for Nonlinear Studies and Beijing-Hong Kong-Singapore Joint Centre for Nonlinear and Complex Systems (Hong Kong) Institute of Computational and Theoretical Studies Hong Kong Baptist University Department of Physics Shaanxi Normal University Department of Physics Zhejiang University Beijing Computational Science Research Center

The brain network is notably cost-efficient, while the fundamental physical and dynamic mechanisms underlying its economical optimization in network structure and activity have not been determined. In this study, we investigate the intricate cost-efficient interplay between structure and dynamics in biologically plausible spatial modular neuronal network models. We observe that critical avalanche states from excitation-inhibition balance under modular network topology with less wiring cost can also achieve lower costs in firing but with strongly enhanced response sensitivity to stimuli. We derive mean-field equations that govern the macroscopic network dynamics through a novel approximate theory. The mechanism of low firing cost and stronger response in the form of critical avalanches is explained as a proximity to a Hopf bifurcation of the modules when increasing their connection density. Our work reveals the generic mechanism underlying the cost-efficient modular organization and critical dynamics widely observed in neural systems, providing insights into brain-inspired efficient computational designs.

关键词： neural network cost efficiency critical avalanche modular network mean-field theory

碳纤维复合材料预制体针刺技术研究现状与思考

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化工新型材料 2024年第7期52卷 14-19页

作者：魏宇博贺辛亥程攀李彦璋梁军浩刘菲王强西安工程大学材料工程学院西安710048 西安市纺织复合材料重点实验室西安710048 陕西美兰德炭素有限责任公司西安710600

预制体作为复合材料的“增强骨架”,对复合材料的性能具有重要影响。而针刺工艺因其简单、快捷、低成本等优点逐渐成为制备预制体的主流技术。为了深入了解有关针刺技术、针刺预制体以及针刺复合材料的研究情况,介绍了针刺技术概况,论... 详细信息

预制体作为复合材料的“增强骨架”,对复合材料的性能具有重要影响。而针刺工艺因其简单、快捷、低成本等优点逐渐成为制备预制体的主流技术。为了深入了解有关针刺技术、针刺预制体以及针刺复合材料的研究情况,介绍了针刺技术概况,论述了针刺工艺参数、针刺预制体类型以及针刺复合材料的实验研究和理论建模方面的研究进展,并基于此分析了针刺技术未来的发展方向。

关键词：碳纤维复合材料预制体针刺工艺

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Dual Effects of Interfacial Interaction and Geometric Constraints on Structural Formation of Poly(butylene terephthalate)Nanorods

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Chinese Journal of Polymer Science 2022年第6期40卷 700-708页

作者： Kaichao Wang Ziwei Lai Jiaman Huang Haiying Li Ziying liang junhao liang Xing Ouyang Xiaoguang Li Yan Cao Institute for Advanced Study(IAS) Shenzhen UniversityShenzhen 518060China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518060China South China Advanced Institute for Soft Matter Science and Technology School of Molecular Science and EngineeringSouth China University of TechnologyGuangzhou 510640China

When the size of the material is smaller than the size of the molecular chain,new nanostructures can be formed by crystallizing polymers in nanoporous ***,the effect of pore wall and geometric constraints on polymer nanostructures remains *** this study,we demonstrate three new restricted nanostructures{upright-,flat-and tilting-ring}in polybutylene terephthalate(PBT)nanorods prepared from nanoporous *** dual effects of geometrical constraints and interfacial interactions on the formation of PBT nanostructures were investigated for the first time by using X-ray diffraction and Cerius^(2) modeling *** weak constraints,the interaction between pore wall and the PBT rings is dominant and the ring plane tends to be parallel to the pore wall and radiate outward to grow the upright-ring ***,in strong 2D confinement,a structural formation reversal occurs and geometrical constraints overpower the effect of pore *** tend to pile up vertically or obliquely along the long axis of the rod,so the flat-and tilting-ring crystals are predominate in the constrained *** principle,our study of the nanostructure formation based on the geometrical constraints and the pore wall interfacial effects could provide a new route to manipulate the chain assembly at the nanoscale,further improving the performance of polymer nanomaterial.

关键词： Cylindrical confinement Poly(butylene terephthalate) Nanorods Geometry constraints Interfacial interaction

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中西医结合康复对不完全性脊髓损伤的影响

长春中医药大学学报 2024年第6期40卷 655-659页

作者：陈罗西敬竹子刘付龙梁俊豪任凯四川省骨科医院康复科成都610041

目的探讨中西医结合康复对不完全性脊髓损伤(ISCI)患者的影响。方法选择64例不完全性脊髓损伤患者,采用随机数字表简单化分组法(余数法)分为观察组与对照组,各32例,对照组给予常规物理治疗+康复训练,观察组在对照组基础上联合针刺+中医... 详细信息

目的探讨中西医结合康复对不完全性脊髓损伤(ISCI)患者的影响。方法选择64例不完全性脊髓损伤患者,采用随机数字表简单化分组法(余数法)分为观察组与对照组,各32例,对照组给予常规物理治疗+康复训练,观察组在对照组基础上联合针刺+中医特色功能训练。通过评估美国脊柱损伤学会运动评分(ASIA-MS)、疼痛视觉模拟评分(VAS)、日常生活能力评分(ADL)、10 m最快步行速度测试(10MWT)、6 min步行耐力测试(6MWT)、计时起立-行走测试(TUGT)、Berg平衡量表(BBS)变化情况,分析2组康复效果。结果康复治疗4周时,观察组ASIA-MS、ADL评分高于对照组(P<0.05),VAS评分低于对照组(P<0.05);治疗4周、6周、8周时,观察组10MWT均低于对照组(P<0.05),6MWT均高于对照组(P<0.05);观察组治疗8周时TUGT低于对照组(P<0.05);观察组治疗8周、12周时BBS评分高于对照组(P<0.05)。结论中西医结合康复治疗有利于不完全性脊髓损伤神经再生修复,促进患者步行能力、平衡能力提升。

关键词：不完全性脊髓损伤康复中西医结合针刺中医特色功能训练步行能力

An ultra-thin piezoelectric nanogenerator with breathable,superhydrophobic,and antibacterial properties for human motion monitoring

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Nano Research 2023年第9期16卷 11612-11620页

作者： Wei Fan Cong Zhang Yang Liu Shujuan Wang Kai Dong Yi Li Fan Wu junhao liang Chunlan Wang Yingying Zhang School of Textile Science and Engineering Key Laboratory of Functional Textile Material and Product of the Ministry of EducationXi’an Polytechnic UniversityXi’an 710048China Department of Chemistry Tsinghua UniversityBeijing 100084China School of Chemistry Xi’an Jiaotong UniversityXi’an 710049China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 100083China Department of Materials University of ManchesterManchesterM139PLUK

Piezoelectric nanogenerators(PENGs)are promising for harvesting renewable and abundant mechanical energy with high *** to now,published research studies have mainly focused on increasing the sensitivity and output of *** technical challenges in relation to practicability,comfort,and antibacterial performance,which are critically important for wearable applications,have not been well *** overcome the limitations,we developed an all-nanofiber PENG(ANF-PENG)with a sandwich structure,in which the middle poly(vinylidene fluoride-co-hexafluoropropylene(P(VDF-HFP))/ZnO electrospun nanofibers serve as the piezoelectric layer,and the above and below electrostatic direct-writing P(VDF-HFP)/ZnO nanofiber membranes with a 110 nm Ag layer on one side that was plated by vacuum coating technique serve as the electrode *** the ANF-PENG only has 91μm thick and does not need further encapsulating,it has a high air permeability of 24.97 mm/*** nanoparticles in ANF-PENG not only improve the piezoelectric output,but also have antibacterial function(over 98%).The multifunctional ANF-PENG demonstrates good sensitivity to human motion and can harvest mechanical energy,indicating great potential applications in flexible self-powered electronic wearables and body health monitoring.

关键词： piezoelectric nanogenerator breathability super-hydrophobicity antibacterial performance wearable electronics

Micro-mechanical model for predicting the elasto-plastic behavior of composites based on secant formulation method

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Chinese Journal of Aeronautics 2021年第1期34卷 281-295页

作者： junhao liang Xinhai HE Wenlong TIAN School of Materials Science&Engineering Xi'an Polytechnic UniversityXi'an 710048China Shaanxi Key Laboratory of Surface Engineering and Remanufacturing Xi'an UniversityXi'an 710048China School of Mechanical Engineering Northwestern Polytechnical UniversityXi'an 710072China

To predict the Elasto-Plastic Behaviors(EPBs)of aligned inclusions reinforced composites,this paper develops an interpolative Mori-Tanaka/Double-Inclusion(MT-DI)homogenization model with the secant formulation,and gives the numerical implementation algorithms of the developed MT-DI model with the secant *** Finite Element(FE)homogenization method is implemented to provide the "exact" EPBs of the composites and thus validate the MT-DI model with the secant *** MT-DI model with the 2 nd-order secant formulation is validated to provide the more accurate predictions,while the MT-DI model with the 1 st-order secant formulation always gives the stiffer *** results show that using the macro-stress and macrostrain as the inputs,the MT-DI model with the secant formulation gives the identical *** predictions of the MT-DI model with the secant formulation vary between those of the MT and DI models with the secant ***,the MT-DI model with the secant formulation does not predict the accurate EPBs for the phases of the composites.

关键词： Elasto-plastic behavior FE homogenization Mean-field homogenization MT-DI model Secant formulation

碳纤维立体穿刺预制体成型技术发展现状与思考

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纺织器材 2024年第1期51卷 65-68页

作者：李彦璋贺辛亥程攀魏宇博梁军浩刘菲王强西安工程大学材料工程学院西安710048 西安纺织复合材料国家省级重点试验室西安710048 陕西美兰德新材料股份有限公司西安710600

为了推动碳纤维立体穿刺预制体成型技术的发展和应用,从穿刺机的性能优化、穿刺成型材料性能、高温下穿刺成型技术、穿刺成型技术仿真模拟等方面综合分析碳纤维立体穿刺预制体成型技术的研究现状,总结其关键特点和不足;分析碳纤维立体... 详细信息

为了推动碳纤维立体穿刺预制体成型技术的发展和应用,从穿刺机的性能优化、穿刺成型材料性能、高温下穿刺成型技术、穿刺成型技术仿真模拟等方面综合分析碳纤维立体穿刺预制体成型技术的研究现状,总结其关键特点和不足;分析碳纤维立体穿刺预制体成型技术在钢针阵列、自动化程度等方面存在的问题,并提出改进建议和思考。指出:碳纤维立体穿刺预制体成型技术可从减少钢针与布层间的相互损伤、提高穿刺效率、深入理论研究、针对异型立体织物的穿刺工艺优化、拓展应用领域等方面着手,加强设计优化和工艺改进,深入探索具体应用场景和改进方法,提高穿刺精度和产品质量。

关键词：碳纤维立体穿刺预制体成型钢针矩阵排布