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Constructal design of a rectangular porous fin considering minimization of maximum temperature difference and pumping power consumption

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Science China(Technological Sciences) 2024年第3期67卷 919-929页

作者： LIU XiaoYe FENG HuiJun chen Lingen ge YanLin Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan 430205China College of Power Engineering Naval University of EngineeringWuhan 430033China Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment Wuhan 430205China School of Mechanical&Electrical Engineering Wuhan Institute of TechnologyWuhan 430205China

A heat dissipation model of a rectangular porous fin is established based on constructal theory. First, the constructal design of rectangular porous fin is conducted by selecting a complex function minimization, which composed of linear weighting sum of maximum temperature difference and pumping power consumption, as optimization objective. Effects of gap height, air inlet velocity, total porous fin volume and porosity on the optimal constructs are investigated, respectively. The findings show that the complex function can attain its double minimum at a value of 0.802 when the fin length and number are optimized, and the corresponding optimal fin length and number are 8.01 mm and 10, respectively. In comparison to original design, the complex function and maximum temperature difference after twice optimization are decreased by 19.80% and 66.31%, ***, the comprehensive performance of porous fin is improved by simultaneously optimizing the fin length and number. The artificial neural network is applied to predict the fin performances, which is used to conduct multi-objective optimization based on NSGA-II algorithm. Optimal structure of porous fin for multiple requirements is gained by LINMAP and TOPSIS decisionmaking strategies. The findings in this study can serve as theoretical guides for fin thermal designs of electronic devices.

关键词： constructal theory rectangular porous fin pumping power consumption maximum temperature difference complex function multi-objective optimization

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电感耦合等离子体原子发射光谱法(ICP-AES)测定硅铝微粉中铍的含量

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云南冶金 2024年第3期53卷 155-160,170页

作者：杨艳辉廖仕英蒋娴芳陈怡君张杰陈格天齐锂业股份有限公司四川射洪629200 锂资源与锂材料四川省重点实验室四川射洪629200

采用电感耦合等离子体发射光谱法对硅铝微粉中铍元素的含量进行测定。本文采用氢氧化钠高温条件下对硅铝微粉样品进行熔融,确定了氢氧化钠的用量及熔融时间,确立了最佳试验条件,铝基体和硅基体对测定结果无干扰,但碱熔法带入了大量的钠... 详细信息

采用电感耦合等离子体发射光谱法对硅铝微粉中铍元素的含量进行测定。本文采用氢氧化钠高温条件下对硅铝微粉样品进行熔融,确定了氢氧化钠的用量及熔融时间,确立了最佳试验条件,铝基体和硅基体对测定结果无干扰,但碱熔法带入了大量的钠盐,故采用基体匹配标准曲线法,标准曲线的线性相关系数为0.9999;方法的精密度较好,相对标准偏差(n=11)小于3.00%;方法的灵敏度较高,检出限为0.02116μg/g;加标回收率为99.4%~103.67%。方法适用于硅铝微粉中铍元素含量范围为2.00~300.00μg/g的测定。

关键词：硅铝微粉铍电感耦合等离子发射光谱仪碱熔

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基于最小二乘法的Creo钣金件展开长度算法研究

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煤矿机械 2024年第2期45卷 22-24页

作者：马恒波陈戈凡乃峰宋灵修郑州煤矿机械集团股份有限公司郑州450016

对传统的钣金件展开长计算方法进行了分析,结合生产经验,从最小二乘法的角度对K因子进行了计算拟合,通过重新定义Creo的折弯余量表实现不同板厚、半径的K因子自动计算,进而实现展开长的自动计算,其计算过程高效,结果准确,在实际生产中... 详细信息

对传统的钣金件展开长计算方法进行了分析,结合生产经验,从最小二乘法的角度对K因子进行了计算拟合,通过重新定义Creo的折弯余量表实现不同板厚、半径的K因子自动计算,进而实现展开长的自动计算,其计算过程高效,结果准确,在实际生产中得到了良好的应用。

关键词：钣金展开长最小二乘法 K因子折弯余量表

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基于ROBOGUIDE的液压支架离线焊接程序研究

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煤矿机械 2024年第1期45卷 185-188页

作者：陈戈闫书廷凡乃峰段青辰郑州煤矿机械集团股份有限公司郑州450000

针对液压支架所具有的定制化产品特性而引出的焊接程序提前编制需求,基于发那科ROBOGUIDE离线编程软件,进行离线工作站建立、离线焊接程序编制、寻位方式优化以及现场实际验证的相关研究。

关键词：液压支架离线焊接程序 ROBOGUIDE 动态用户坐标系复合寻位

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有机胺类CO_(2)捕集吸收剂研究进展

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应用化工 2024年第1期53卷 172-177页

作者：张帅郅晓石信超房晶瑞曲齐齐马腾坤陈阁中国建筑材料科学研究总院有限公司绿色建筑材料国家重点实验北京100024

综述了有机胺类化学吸收剂的研究进展、性能评价指标、不同吸收剂的CO_(2)捕集机理、存在问题以及有机胺类CO_(2)捕集吸收剂的发展趋势。为了实现1.5℃温控目标及“碳中和”愿景,二氧化碳捕集、利用与封存技术的研发和应用愈发受到关注... 详细信息

综述了有机胺类化学吸收剂的研究进展、性能评价指标、不同吸收剂的CO_(2)捕集机理、存在问题以及有机胺类CO_(2)捕集吸收剂的发展趋势。为了实现1.5℃温控目标及“碳中和”愿景,二氧化碳捕集、利用与封存技术的研发和应用愈发受到关注。在众多碳捕集技术中,以有机胺类作为吸收剂的化学吸收法是研究最多、最为成熟的碳捕集技术,已在电力、水泥、化工等行业建成多项示范工程,有望实现电力和工业部门大规模CO_(2)减排。

关键词：碳捕集有机胺化学吸收相变催化

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NIR-IIb-triggered photodynamic therapy combined with chemotherapy platform based on rare-earth-doped nanoparticles

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Rare Metals 2024年第7期43卷 3220-3231页

作者： Zhuo Tu Yong Wan Juan ge chen-chen Li Tao Liang Zhen Li College of Health Science and Engineering College of Chemistry and Chemical EngineeringHubei University

Photodynamic therapy（PDT）,with high spatiotemporal selectivity,minimal side effects and less drug resistance,has emerged as a promising approach for the treatment of ***,inadequate penetration depth and poor efficacy seriously restrict its practical *** address these challenges,we developed a combined therapy platform（RENP@C/D-FA） based on rare-earth-doped nanoparticles（RENPs） with a structure of NaErF4:Tm（0.5%）@NaYF4,on which photosensitizer Ce6（chlorin e6） and chemo-therapeutic drug（DOX）(doxorubicin) were loaded by encapsulating with an amphiphilic polymer distearoyl phosphatidylethanolamine-polyethylene glycol-folic acid（DSPE-PEG-FA）.RENPs with NaErF4as the matrix possess multiple excitation/emission peaks,enabling activation of PDT under near-infrared-Ⅱb（NIR-Ⅱb,1500-1700 nm） excitation and luminescence imaging in NIR-Ⅱb region by absorbing 808 nm near-infrared ***,DOX can be selectively released in the acidic microenvironment of *** from the tumor targeting capability of folic acid,this platform can successfully ablate tumor cells and inhibit tumor growth by combining PDT and *** innovative approach holds great promise as a powerful tool for cancer treatment,showing the potential to revolutionize PDT.

关键词： Photodynamic therapy Rare-earth-doped nanoparticles NIR-IIb Chemotherapy Combined therapy

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Curved anisotropic polaritons

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Frontiers of physics 2024年第3期19卷 217-224页

作者： Tao Hou Yixiao ge Shuwen Xue Huanyang chen Department of Physics and Institute of Electromagnetics and Acoustics Xiamen UniversityXiamen 361005China Jiujiang Research Institute of Xiamen University Jiujiang 332000China

The curved surface has emerged as new research platform for understanding and manipulating novel electromagnetic behaviors in complex media. In this paper, we explore the anisotropic polaritons on the spherical surface based on Maxwell’s fish-eye metric through stereographic projection. Additionally, this phenomenon can be extended to spindle surface by conformal mapping. Our calculations and simulations demonstrate the elliptic and hyperbolic polaritons, excited by an electric dipole on the sphere, will self-focus or focus on the poles on the sphere affected by anisotropic permittivity. Furthermore, we reveal the optical singularity nature of the curved hyperbolic polaritons from the perspective of transformation optics by obtaining the equivalent optical refractive index profiles and the particle potential energy. Based on natural anisotropic materials and metamaterials, the curved polaritons have potential applications in curved surface focusing and chaos regulation. This work not only bridges the transformation optics and anisotropic polaritons at curved surface, but also provides a new route to surface optical field manipulation.

关键词： anisotropic polaritons transformation optics curved surface

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Energy budget of cold and hot gas-solid fluidized beds through CFD-DEM simulations

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Particuology 2024年第6期89卷 153-171页

作者： Lei Bi Yunpeng Jiao Chunjiang Liu Jianhua chen Wei ge School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

Direct energy budget is carried out for both cold and hot flow in gas–solid fluidization ***,the energy paths are proposed from thermodynamic *** consumption means total power input to the specific system,and it can be decomposed into energy retention and energy *** retention is the variation of accumulated mechanical energy in the system,and energy dissipation is the energy converted to heat by irreversible *** based on the Computational Fluid Dynamics-Discrete Element Method(CFD-DEM)framework,different energy terms are quantified from the specific flow elements of fluid cells and particles as well as their interactions with the *** order to clarify the energy budget,it is important to identify which system is studied:the particle-fluid system or the particle *** the cold flow,the total energy consumption of the particle sub-system can well indicate the onset of bubbling and turbulent,while the variation of local energy consumption terms can reflect the evolution of heterogeneous *** the hot flow,different heat transfer mechanisms are analyzed and the solver is modified to reproduce the experimental *** impact of the heat transfer mechanisms and heat production on energy consumption is also *** proposed budget method has proven to be energy-conservative and easy to conduct,and it is hopeful to be applied to other multiphase flow systems.

关键词： Energy budget Gas-solid fluidization CFD-DEM Regime transition Heat transfer mechanism

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Increasing grain weight and yield stability by increasing pre-heading non-structural carbohydrate reserves per spikelet in short-growth duration rice

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The Crop Journal 2023年第6期11卷 1912-1920页

作者： Xing Li Ruichun Zhang ge chen Jiaxin Xie Zhengwu Xiao Fangbo Cao Izhar Ali Anas Iqbal Abdul Wahab Min Huang Jiana chen Rice and Product Ecophysiology Key Laboratory of Ministry of Education for Crop Physiology and Molecular BiologyHunan Agricultural UniversityChangsha 410128HunanChina Hengyang Academy of Agricultural Sciences Hengyang 421101HunanChina Yueyang Academy of Agricultural Sciences Yueyang 414022HunanChina College of Agriculture Guangxi UniversityNanning 530004GuangxiChina State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources College of AgricultureSouth China Agricultural UniversityGuangzhou 510642GuangdongChina Shanghai Center for Plant Stress Biology CAS Center for Excellence in Molecular Plant SciencesChinese Academy of SciencesShanghai 200032China

Rice yield stability is a breeding goal,particularly for short-growth duration rice,but its underlying mechanisms remain *** an attempt to identify the relationship between yield stability and source–sink characteristics in short-growth duration rice,a field experiment was conducted at three sites(Yueyang,Liuyang,and Hengyang)in 2021 and *** study compared yield,yield components,source–sink characteristics,and their stability between two stable-yielding short-growth duration rice cultivars,Zhongzao 39(Z-39)and Lingliangyou 268(L-268),and two unstable-yielding short-growth duration rice cultivars,Zhongjiazao 17(Z-17)and Zhuliangyou 819(Z-819).The stability of agronomic parameters was represented by the coefficient of variation(CV).The respective CVs of yield in Z-17,Z-819,Z-39,and L-268 were 10.2%,10.1%,4.5%,and 5.7%in 2021 and 19.7%,15.0%,5.4%,and 6.5%in *** respective CVs of grain weight were 6.3%,5.7%,3.4%,and 4.5%in Z-17,Z-819,Z-39,and L-268 in 2021,and 8.1%,6.3%,1.5%,and 0.8%in *** mean source capacity per spikelet and pre-heading non-structural carbohydrate reserves per spikelet(NSC_(pre))were 7%–43%and7%–72%lower in Z-819 and Z-17than in L-268 and Z-39 in 2021 and *** mean quantum yield of photosystem II photochemistry of leaf,leaf area index,and specific leaf weight of L-268 and Z-39 were higher than those of Z-819 and Z-17 at the heading *** study suggests that high NSC_(pre),caused by great leaf traits before heading,increases source capacity per spikelet and its stability,thereby increasing the stability of grain weight and *** NSC_(pre)is critical for achieving grain weight and yield stability in short-growth duration rice.

关键词： Non-structural carbohydrate Short-growth duration rice Source-sink characteristics Yield stability

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以博物馆建设为载体推动中医药文化创造性转化、创新性发展调研情况分析

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世界中西医结合杂志 2024年第5期19卷 1036-1040,1046页

作者：杨荣臣胡广芹宋晨鸽尹素菊段昭思潘志航国家中医药博物馆北京100101 北京工业大学北京100124

近年来,党和国家领导人高度重视中医药事业发展,在新的历史阶段大力推进博物馆建设,既是贯彻落实党中央及国务院对中医药发展的具体行动,同时也是全面展现中华文明、推进中医药文化创造性转化与创新性发展、推动中医药走向世界的需要。... 详细信息

近年来,党和国家领导人高度重视中医药事业发展,在新的历史阶段大力推进博物馆建设,既是贯彻落实党中央及国务院对中医药发展的具体行动,同时也是全面展现中华文明、推进中医药文化创造性转化与创新性发展、推动中医药走向世界的需要。为全面了解博物馆,特别是中医药博物馆推进中医药文化创造性转化、创新性发展的现状及社会认知情况,国家中医药博物馆组织开展“以博物馆建设为载体推动中医药文化创造性转化、创新性发展”调研,通过实地考察及问卷调研相结合方式具体实施,并通过调研结果分析,总结归纳相关问题,提出对策与建议。

关键词：博物馆建设中医药文化创造性转化创新性发展调研

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