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两种圆柱形货物装箱问题研究

通化师范学院学报 2024年第6期45卷 25-32页

作者：贾春玉郭美芳广东培正学院管理学院广东广州510830

两种圆柱形货物装箱问题是复杂的NP难问题,现有解法对问题的描述多数为奇数层和偶数层,以及每层摆放个数,需要向上或向下取整确定相关数值,很难构建数学模型进行精确求解和提高优化程度.现有解法多数是启发式、递归式智能搜索法等.这些... 详细信息

两种圆柱形货物装箱问题是复杂的NP难问题,现有解法对问题的描述多数为奇数层和偶数层,以及每层摆放个数,需要向上或向下取整确定相关数值,很难构建数学模型进行精确求解和提高优化程度.现有解法多数是启发式、递归式智能搜索法等.这些方法虽然能解决许多装箱或下料问题,但相对复杂、繁琐,不易掌握和实际运用.为了克服这些问题,该文提出一种新的简便解法,该解法一方面对问题进行重新描述,分为对齐层、压缝单数层和双数层,便于构建数学模型.另一方面根据剩余尺寸上限,缩小变量取值范围,使问题规模急剧缩小,可有效运用线性规划求解这类问题.新解法相对简单,易于掌握,优化程度高.

关键词：两种圆柱形货物装箱问题新的简便解法优化程度

Flight dynamics modeling of a small ducted fan aerial vehicle based on parameter identifcation

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Chinese Journal of Aeronautics 2013年第6期26卷 1439-1448页

作者： Wang Zhengjie Liu Zhijun Fan Ningjun guo meifang School of Mechatronical Engineering Beijing Institute of Technology North Institute for Science & Technical Information

This paper presents a simple and useful modeling method to acquire a dynamics model of an aerial vehicle containing unknown parameters using mechanism modeling,and then to design different identifcation experiments to identify the parameters based on the sources and features of its unknown *** on the mathematical model of the aerial vehicle acquired by modeling and identifcation,a design for the structural parameters of the attitude control system is carried out,and the results of the attitude control flaps are verifed by simulation experiments and flight tests of the aerial *** of the mathematical simulation and flight tests show that the mathematical model acquired using parameter identifcation is comparatively accurate and of clear mechanics,and can be used as the reference and basis for the structural design.

关键词： Aerodynamics Experimental aerodynamics Flight vehicle design Multidisciplinary design optimization Structural design

Research progress of MOF-based materials in the photocatalytic CO_(2)reduction

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Carbon Resources Conversion 2024年第1期7卷 103-121页

作者： Qian Su Qingjie guo Haiquan Wang meifang Liu Cheng Zuo College of Chemistry&Chemical and Environmental Engineering Weifang UniversityWeifangPeople’s Republic of China State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuanPeople’s Republic of China

Photocatalytic technology could utilize solar energy to reduce CO_(2)into high-value-added fossil fuels,providing promising solutions for global energy and environmental ***-organic frameworks(MOFs)are a class of crystalline porous solids with high porosity and flexible ***-based photocatalysts have excellent CO_(2)capture ability,photochemical and structural characteristics and have shown infinite development potential in CO_(2)***,in practical large-scale applications,MOF-based photocatalysts still have some urgent problems to be solved,such as high composite rate of photogenerated carriers,limited response range to visible spectrum,poor photocatalytic activity and weak reduction *** paper introduces series of MOF-based photocatalysts,including pure MOF materials,compounds,and derivatives,were reviewed based on recent *** was placed on the modification strategy of photocatalysts,the photocatalytic reaction’s key physical and chemical parameters,and the mechanism of synergistic improvement of chemical fuel *** and most importantly,the future development trends and prospects of MOF-based catalysts for photocatalytic CO_(2)reduction were discussed.

关键词： Photocatalysis Metal-organic frameworks Rational design CO_(2)reduction

Innovations in metallurgical and materials processes:advancing liquid theory and honoring ***-jie guo's contributions to physical chemistry in metallurgy

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Journal of Iron and Steel Research International 2024年第1期31卷 1-2页

作者： Shuai Liu Jing guo Han-jie guo School of Artificial Intelligence Beijing Technology and Business UniversityBeijing100048China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China

Spanning three decades,***-jie guo's research group has dedicated itself to exploring the fundamental theories and practical applications of physical chemistry within the realm of *** under the assumption that molecul... 详细信息

关键词： chemistry liquid complexes

表征聚乙烯化学组成分布的热梯度相互作用色谱技术的综述

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石油化工 2013年第4期42卷 463-467页

作者：张京春郭梅芳中国石化北京化工研究院北京100013

综述了分析聚乙烯化学组成分布的热梯度相互作用色谱(TGIC)技术。介绍了TGIC技术的实验方法和影响TGIC实验的因素。借用现有的结晶淋洗分级仪、石墨材料色谱柱和通用的检测器就可建立TGIC实验装置。TGIC技术可用于在较大的共聚单体含量... 详细信息

综述了分析聚乙烯化学组成分布的热梯度相互作用色谱(TGIC)技术。介绍了TGIC技术的实验方法和影响TGIC实验的因素。借用现有的结晶淋洗分级仪、石墨材料色谱柱和通用的检测器就可建立TGIC实验装置。TGIC技术可用于在较大的共聚单体含量范围内建立对乙烯共聚物的分析方法。对由微观结构接近的聚合物组成的共混物,用TGIC进行分析可以不受共结晶的影响而得出可靠结果。TGIC技术还可与升温淋洗分级或结晶淋洗分级技术相结合,提高分析聚烯烃的分辨率。

关键词：热梯度相互作用色谱共聚物共混物共聚单体含量分析

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抗冲共聚聚丙烯组成分析研究进展

合成树脂及塑料 2016年第3期33卷 84-88页

作者：刘宣伯郭梅芳中国石油化工股份有限公司北京化工研究院北京市100013

综述了采用分级方法对聚丙烯抗冲共聚物组成进行分析的研究进展。基于结晶能力的分级方法只对可结晶组分有分级效果。其中,升温淋洗分级法分级机理简单,可用于试样的分析和制备,但耗时较长;结晶分级法仅需结晶步骤,所需实验时间短;结晶... 详细信息

综述了采用分级方法对聚丙烯抗冲共聚物组成进行分析的研究进展。基于结晶能力的分级方法只对可结晶组分有分级效果。其中,升温淋洗分级法分级机理简单,可用于试样的分析和制备,但耗时较长;结晶分级法仅需结晶步骤,所需实验时间短;结晶淋洗分级法利用动态结晶原理,所需实验时间更短,分级效果更好。基于相互作用的分级方法不受组分结晶性的限制,应用范围更广。其中,溶剂梯度相互作用色谱法对多种试样有较好的分级效果,但需要使用多种溶剂;温度梯度相互作用色谱法使用单一溶剂,可以与多种检测器联用,进而获得更加丰富的实验数据;交叉分级法将各种分级方法与体积排除色谱法相结合,能够获得更加全面的信息。

关键词：聚丙烯抗冲击分级组成分析

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文化产业金融创新的新思路

开放导报 2013年第5期 102-105页

作者：张扬郭梅芳深圳大学广东深圳518060 广州大学广东广州511442

产业金融创新的系统性风险、文化产业的自然属性及发展现状,共同构成了面向文化产业进行金融创新的风险所在。提高文化产品的可定价性及可交易性有利于规避创新风险,产业内部结构调整、构建文化科技金融体系与文化金融市场创新是可行的... 详细信息

产业金融创新的系统性风险、文化产业的自然属性及发展现状,共同构成了面向文化产业进行金融创新的风险所在。提高文化产品的可定价性及可交易性有利于规避创新风险,产业内部结构调整、构建文化科技金融体系与文化金融市场创新是可行的对策思路。

关键词：文化产业金融创新风险

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结晶分级和分析型升温淋洗分级表征聚烯烃

石油化工 2010年第10期39卷 1166-1170页

作者：黄红红魏东郭梅芳中国石油化工股份有限公司北京化工研究院北京100013

用结晶分级(CRYSTAF)法和分析型升温淋洗分级(A-TREF)法对几种聚烯烃试样的分子链结构进行了表征,研究了降温速率对分级结果的影响,比较和分析了两种分析方法的适用性。实验结果表明,为消除相对分子质量对分级结果的影响,对于聚乙烯试样... 详细信息

用结晶分级(CRYSTAF)法和分析型升温淋洗分级(A-TREF)法对几种聚烯烃试样的分子链结构进行了表征,研究了降温速率对分级结果的影响,比较和分析了两种分析方法的适用性。实验结果表明,为消除相对分子质量对分级结果的影响,对于聚乙烯试样,A-TREF法应选用小于0.1℃/min的降温速率,而CRYSTAF法则可选用较快的降温速率(0.1～0.2℃/min);对于聚丙烯试样,CRYSTAF法和A-TREF法均可选用0.1～0.2℃/min的降温速率。两种分析方法对同一个试样有相似的级分分布曲线。实验结果还表明,聚烯烃试样的CRYSTAF曲线和A-TREF曲线有一定的指纹特性,结合甲基检测器的信息,两种分级方法还可用于共混聚烯烃的分离和鉴定。

关键词：结晶分级升温淋洗分级聚乙烯聚丙烯聚烯烃表征

Emerging direct current triboelectric nanogenerator for high-entropy mechanical energy harvesting

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Science China(Technological Sciences) 2024年第5期67卷 1297-1316页

作者： CHEN Jie guo RuiLong guo HengYu College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 401331China Department of Applied Physics Chongqing UniversityChongqing 401331China

In the era of the Internet of Things(IoT),the provision of sustainable power to distributed,mobile,and low-power-consumption electronic devices is a critical *** overcome this challenge,the triboelectric nanogenerator(TENG),a highly efficient high-entropy mechanical energy harvesting device,was developed in *** device enables the direct conversion of irregular and low-frequency mechanical energy into pulsed alternating current(AC)***,the incompatibility of most electronic devices with AC signals necessitates rectifier circuits or generators that deliver direct current(DC)*** recent years,DC-TENGs have undergone extensive development,achieving significant milestones in various application fields while also facing crucial challenges that require *** this review,three categories of DC-TENG devices with distinct operating mechanisms are comprehensively explored:multiphase coupling,mechanical rectification,and air *** typical structures and working mechanisms are thoroughly discussed,and specific output performance limitations,along with corresponding optimization strategies,are ***,the applications of DC-TENGs in various scenarios are ***,the challenges faced by DC-TENGs and potential solutions are analyzed to guide further advancements in this technology.

关键词： TENG direct current working mechanisms output performance limitations optimization strategies