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Solar trough receiver with V-grooved light traps for efficiency improvement

Science China Technological Sciences 2025年第1期 146-156页

作者： Bin liU qing li Yu QIU School of Energy Science and Engineering Central South University

Parabolic trough collector is a promising technology for both domestic and industrial heat supplies. To enhance the collector efficiency, a modified trough receiver with dozens of V-grooved light traps incorporated into its lower-half absorber was introduced. For assessing the performance of this receiver, a solar-thermal-stress coupled model was established. Using this model, firstly, the effects of the V-grooved light traps were investigated. The results reveal that, compared to the conventional trough receiver, the modified trough receivers equipped with different traps can reduce their optical losses by 81.9–138.0 Wm-1（i.e., 15.0%–25.2%）, improving their optical efficiencies by 1.60%–2.69%. However, these traps also result in increased thermal loss from the receiver. Therefore, there is no single optimal modified trough receiver that consistently outperforms all other receivers across all possible conditions. Nonetheless, the MTR30-3 and MTR60-3 receivers emerge as the optimized choices due to their better solar-thermal performance. Subsequently, performance evaluation reveals that the two optimized receivers can enhance the receiver efficiencies within the typical solar irradiance range by 0.02%–2.65% and 0.05%–1.70% when the inlet fluid temperatures are below 488 and 523 K, respectively. Consequently, the collector efficiencies can be improved by 0.02%–2.49% and 0.05%–1.60%, respectively. Additionally, thermal stress analysis verifies that the two optimized receivers remain within safe limits under all typical conditions. Given that the heating temperature of a typical solar collector for domestic or industrial heat supply is typically below 523 K, the integration of the two optimized receivers has the capability to effectively enhance the overall collector efficiency.

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异构无人系统协同控制研究进展

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工程科学学报 2025年第1期47卷 66-78页

作者：郭兴李擎姚其家鲁小雅北京科技大学自动化学院北京100083 工业过程知识自动化教育部重点实验室北京100083

面对复杂化、多样化和立体化的任务需求,异构无人系统将空、地、海跨域优势互补,最大化提升系统各方面能力,为未来协同作战和智慧民生提供有力的技术保障.首先,梳理了国内外在跨域协同领域出台的推动性文件,介绍了异构无人系统在军用、... 详细信息

面对复杂化、多样化和立体化的任务需求,异构无人系统将空、地、海跨域优势互补,最大化提升系统各方面能力,为未来协同作战和智慧民生提供有力的技术保障.首先,梳理了国内外在跨域协同领域出台的推动性文件,介绍了异构无人系统在军用、科研院所和民用等三方面的实际应用.其次,针对异构无人系统关键技术之一的协同控制,分别阐述了异构无人系统协同控制在一致性、轨迹跟踪和编队‒合围等三方面的最新进展.此外,还特别讨论了在不同通信条件下协同控制所面临的挑战和解决方案.其中,由于一致性和轨迹跟踪存在上层控制理论性和下层控制可行性的区别,进一步从滑模控制、自适应控制、反步控制和自适应动态规划等四方面对轨迹跟踪研究展开阐述.然后,为了更好地促进异构无人系统协同控制在实际中的应用,通过总结前人相关工作,讨论了其在多约束控制与实时性、多任务切换控制和跨域通信下稳定性等三方面亟需解决的技术瓶颈.最后,综合异构无人系统协同控制研究现状和实际需求来看,指出了其在深度强化学习与分布式博弈、人机交互以及反群体智能等三方面的发展趋势.

关键词：异构无人系统协同控制跨域协同任务需求技术瓶颈

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主路式水肥一体机施肥系统的设计与试验

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农机化研究 2025年第2期47卷 68-74页

作者：李擎李家春熊贤沙蔡家斌贵州大学机械工程学院贵阳550025

针对现阶段水肥一体化设备存在施肥不均、自动化程度不高及滞后性严重的问题,根据现代化农业节水省肥和减少环境污染的灌溉要求,设计了一款可实现自动混肥、施肥、节水灌溉的主路式水肥一体化施肥机。根据液肥的EC和pH值调节过程的特点... 详细信息

针对现阶段水肥一体化设备存在施肥不均、自动化程度不高及滞后性严重的问题,根据现代化农业节水省肥和减少环境污染的灌溉要求,设计了一款可实现自动混肥、施肥、节水灌溉的主路式水肥一体化施肥机。根据液肥的EC和pH值调节过程的特点,开发了以SIEMENS S7-1200为核心的液肥控制系统硬件,并结合MatLab设计了以模糊PID为控制器的液肥EC和pH值控制系统。为验证施肥机在实际应用中的精确性和鲁棒性,设计了施肥系统动态调节性能试验,结果表明:在施肥阶段,模糊PID控制系统具有较短的稳态时间和较小的超调量,相比于PID控制系统,对EC和pH值进行调节的稳态时间分别减少了37.7%和52.1%,稳态超调量分别降低了1.2%和2.2%,可实现对混肥溶液进行迅速有效的调节,满足现代农业实际生产需要。

关键词：水肥一体化施肥机模糊PID 过程控制

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First flush of storm runoff pollution from an urban catchment in China

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Journal of Environmental Sciences 2007年第3期19卷 295-299页

作者： li li-qing YIN Cheng-qing HE qing-ci KONG ling-li State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Wuhan Research Institute of Environmental Science Wuhan 430015 China

Storm runoff pollution process was investigated in an urban catchment with an area of 1.3 km^2 in Wuhan City of China. The results indicate that the pollutant concentration peaks preceded the flow peaks in all of 8 monitored storm events. The intervals between pollution peak and flow peak were shorter in the rain events with higher intensity in the initial period than those with lower intensity. The fractions of pollution load transported by the first 30% of runoff volume （FF30） were 52.2%-72.1% for total suspended solids （TSS）, 53.0%-65.3% for chemical oxygen demand （COD）, 40.4%-50.6% for total nitrogen （TN）, and 45.8%-63.2% for total phosphorus （TP）, respectively. Runoff pollution was positively related to non-raining days before the rainfall. Intercepting the first 30% of runoff volume can remove 62.4% of TSS load, 59.4% of COD load, 46.8% of TN load, and 54.1% of TP load, respectively, according to all the storm events. It is suggested that controlling the first flush is a critical measure in reduction of urban stormwater pollution.

关键词： first flush stormwater pollution urban area rainfall pattem runoff

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Tuning metal-support interaction of Pt-based electrocatalysts for hydrogen energy conversion

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Science China Chemistry 2023年第12期66卷 3398-3414页

作者： Shenzhou li Tanyuan Wang qing li State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen 518000China

Pt-based electrocatalysts hold great promise for key electrocatalytic reactions in hydrogen-related energy conversion ***,the catalytic performance is significantly influenced by metal-support interactions(MSI)in the catalysts,making the tuning of MSI in Pt-based catalysts a highly intriguing research *** this review,the catalytic mechanism of Pt-based electrocatalysts is firstly ***,the effects of MSI on supported Pt electrocatalysts are summarized into four types:geometric effects,electronic effects,synergistic effects,and structural ***,the prospect of optimizing the performance of Pt-based electrocatalysts by engineering MSI is exhibited,with the aim of inspiring innovation and advancement of supported Pt catalysts,thereby facilitating the development and utilization of hydrogen energy.

关键词： metal-support interaction Pt-based catalysts electrocatalysis hydrogen evolution reaction oxygen reduction reaction

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跑台训练激活内源性神经干细胞促进小鼠脊髓损伤的修复

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中国组织工程研究 2025年第19期29卷 3976-3982页

作者：陈婵娟上官泽宇李琦哲谭伟李青贵州医科大学附属医院创伤骨科贵州省贵阳市550004 贵州医科大学临床医学院贵州省贵阳市550025

背景:跑台训练是促进脊髓损伤后运动功能恢复的有效方法之一,可以促进神经发生,但是不同强度跑台训练对脊髓内源性干细胞的激活作用尚不明确。目的:分析不同强度跑台训练对脊髓损伤后小鼠脊髓内源性神经干细胞的激活作用。方法:取雌性C5... 详细信息

背景:跑台训练是促进脊髓损伤后运动功能恢复的有效方法之一,可以促进神经发生,但是不同强度跑台训练对脊髓内源性干细胞的激活作用尚不明确。目的:分析不同强度跑台训练对脊髓损伤后小鼠脊髓内源性神经干细胞的激活作用。方法:取雌性C57BL/6J小鼠50只,采用随机数字表法分为对照组、脊髓损伤组及低、中、高强度运动组,每组10只。脊髓损伤组及低、中、高强度运动组利用钳夹法构建T10节段脊髓损伤模型,脊髓损伤后第7天,低、中、高强度运动组分别进行对应强度的跑台训练,3次/d,10 min/次,每周训练6次,连续训练28 d。跑台训练后3,7,14,21,28 d,采用BMS评分评估小鼠后肢运动功能;跑台训练后28 d,获取损伤区域脊髓组织,检测细胞激活标志物表皮生长因子受体、静止细胞标志物胶质纤维酸性蛋白、增殖标志物5-乙炔基-2-脱氧尿苷(EdU)表达,苏木精-伊红染色观察脊髓组织形态。结果与结论:①脊髓损伤各组小鼠BMS评分始终低于对照组(P<0.05);随着跑台训练时间的延长,脊髓损伤小鼠BMS评分逐渐升高,中强度运动组小鼠跑台训练后14,21 d的BMS评分高于脊髓损伤组及低、高强度运动组(P<0.05),中、高强度运动组小鼠跑台训练后28 d的BMS评分高于脊髓损伤组、低强度运动组(P<0.05)。②与对照组比较,脊髓损伤组表皮生长因子受体与EdU阳性细胞比例升高(P<0.05);与脊髓损伤组比较,低、中、高强度运动组表皮生长因子受体与EdU阳性细胞比例均升高(P<0.05),并且中强度运动组最高。与对照组比较,脊髓损伤组胶质纤维酸性蛋白阳性细胞比例升高(P<0.05);与脊髓损伤组比较,低、中、高强度运动组胶质纤维酸性蛋白阳性细胞比例降低(P<0.05),并且中强度运动组最低。③苏木精-伊红染色显示脊髓损伤组小鼠损伤区域形成大片空洞,不同强度跑台训练后脊髓损伤小鼠损伤区域空洞减小,并且中强度运动组减小最明显。④结果表明,低、中、高强度的跑台训练可通过激活内源性神经干细胞促进脊髓损伤小鼠运动功能的恢复,其中中强度运动训练的效果最明显。

关键词：脊髓损伤跑台训练脊髓神经干细胞脊髓内源性神经干细胞运动训练

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The Stability of Nontrivial Positive Steady States for the SKT Model with Large Cross Diffusion

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Acta Mathematicae Applicatae Sinica 2020年第3期36卷 657-669页

作者： qing li Qian XU College of Arts and Sciences Shanghai Maritime UniversityShanghai 201306China Institute of Fundamental and Interdisciplinary Sciences Beijing Union UniversityBeijing 100101China

This paper is concerned with the existence and stability of steady state solutions for the SKT biological competition model with *** applying the detailed spectral analysis and in virtue of the bifurcating direction to the limiting system as the cross diffusion rate tends to infinity,it is proved the stability/instability of the nontrivial positive steady states with some special bifurcating ***,the existence and stability/instability of the corresponding nontrivial positive steady states for the original cross-diffusion system are proved by applying perturbation argument.

关键词： spectral analysis stability cross-diffusion system

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Chinese Journal of Chemical Physics 2009年第1期22卷 13-18页

作者： Jian li Yan-qing Ni Yong-qing li Wei-li Wang Feng-cai Ma Department of Science Shenyang Institute of Aeronautical Engineering Shenyang 110036 China Department of Physics Liaoning University Shenyang 110036 China Department of chemistry University of Coimbra 3004-535 Coimbra Portugal School of Science Liaoning Technical University Fuxin 123000 China

To study theoretically the relationship between the integral interference angle and the scat- tering angle in collisional quantum interference, the integral interference angle of atom- ^2П[case（a）] diatomic molecules system is described. To simulate the experiment theoretically, the theoretical model on collision-induced rotational energy transfer in an atom- ^2П[case（a）]diatom system is presented based on the first order Born approximation taking into account of the long-range interaction potential. For the ^2П electronic state in the Hund＇s case（a） diatom, the degree of the interference is discussed. The interference angles of collision-induced rotational energy transfer of CN（A^2П） in Hund＇s case（a） with He, Ne, and Ar are calculated quantitatively. The key parameters in the determination of integral interference angles are obtained.

关键词： Collisional quantum interference Rotational energy transfer Interference angle

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Nagata-like theorems for almost Prfer v-multiplication domains

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Science China Mathematics 2013年第9期56卷 1773-1780页

作者： li qing College of Computer Science and Technology Southwest University for Nationalities

Let D be an integral domain and X an indeterminate over D . We show that if S is an almost splitting set of an integral domain D , then D is an APVMD if and only if both DS and DN(S) are APVMDs. We also prove that if {Dα}α∈I is a collection of quotient rings of D such that D=∩α∈IDα has finite character (that is, each nonzero d∈D is a unit in almost all Dα) and each of Dα is an APVMD, then D is an APVMD. Using these results, we give several Nagata-like theorems for APVMDs.

关键词： splitting set Nagata-like theorem almost Prüfer v-multiplication domain

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Cooling hot rolling steel strip using combined tactics

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Journal of University of Science and Technology Beijing 2008年第3期15卷 362-365页

作者： li Peng qing li Zhou Zhou School of Communication and Control Engineering Jiangnan University Wuxi 214122 China School of Information Engineering University of Science and Technology Beijing Beijing 100083 China

The coiling temperature control of a typical steel strip mill was investigated. Due to the high speed of a strip and complex circumstance, it is very hard to set up a cooling model with high accuracy. A simplified dynamic model was proposed, based on which a cooling control scheme with combined feedforward, feedback and adaptive algorithms was developed. Meanwhile, the genetic algorithms were used for the optimization of model parameters. Simulations with a model validated using actual plant data were conducted, and the results have confirmed the effectiveness of the proposed control methods. At last, a simulation system for coiling temperature control was developed. It can be used for new product trials and newcomer training.

关键词： coiling temperature temperature control feedforward feedback adaptive algorithm simulation

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