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Science China(Technological Sciences) 2023年第8期66卷 2332-2345页

作者： PAN XinYu yuan mengdi JU Xing XU Chao Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China

Due to the intermittency and indeterminacy of solar irradiance,balancing energy supply and load demand remains a *** paper proposed a switchable hybrid system that combines concentrating photovoltaic/concentrating solar power(CPV/CSP)technology with thermal energy storage(TES)to achieve flexible electricity and thermal generation by adjusting the incident solar flux of photovoltaic(PV).The hybrid system can directly transfer surplus solar energy into high-quality heat for storage using a rotatable PV/heat *** simulated results demonstrated that the hybrid system effectively improves power generation,optimally utilizes TES capacity,and reduces the levelized cost of electricity(LCOE).Over a selected seven-day period,the single-junction(1J)Ga As solar cells used in the hybrid system sustainably satisfied the load demand for more than five days without grid supplement,outperforming the CSP plant by an additional two *** hybrid system utilizing the 1J Ga As with the base configuration of solar multiple(SM)of 1.26 and TES capacity of 5 h improved the annual power production and renewable penetration(RP)by 20.8%and 24.8%compared with the conventional CSP plant,*** hybrid plant with monosilicon and a configuration of SM(1.8),PV ratio(1),and TES capacity(6 h)achieved an optimal LCOE of11.52$ct/k Wh and RP of 75.5%,which is 8.8%lower and 12.1%higher than the CSP plant,respectively.

关键词： concentrated photovoltaic concentrated solar power hybrid system flexible electricity/thermal ratio techno-economic analysis

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Experimental Study on the Molten Salt at Micron Scale during the Melting Process

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Journal of Thermal Science 2024年第1期33卷 70-85页

作者： TIAN Ziqian LIAO Zhirong XU Chao FANG Yongzhe JIANG Kaijun yuan mengdi Key Laboratory of Power Station Energy Transfer Conversion and System Ministry of Education of ChinaSchool of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China

The investigation of the melting behaviors of the molten salt at micron scale during the melting process is critical for explaining the solid-liquid phase transition *** this paper,a novel experimental system and analysis method were proposed to study the melting process with three heating rates in the range of1-10℃/min of the solar salt at micron *** solid-liquid boundary morphology and phase transition kinetics of molten salt particles were focused ***,the correlations between liquid fraction,temperature and time under different heating rates were *** solid-liquid boundary morphology was depicted by the visualized experimental set-up,and the instantaneous liquid volume fraction during the non-isothermal phase transition was ***,the correlation between temperature and liquid volume fraction was proposed to reveal the evolution of the solid-liquid boundary with temperature at different heating ***,the non-isothermal phase transition kinetic equation was established by introducing a constant parameter(V_(a,b)),and more kinetic parameters such as 1g V_(a,b) and-lg V_(a,b)/b were *** results showed that the exponent b is not sensitive to the heating rate with a range of 3-5 for solar salt ***,the heating rate influences the value of V_(a,b) and presents a positive ***,the non-isothermal phase transition kinetic equations at different heating rates in the range of 1-10℃/min can be quickly predicted by the proposed improved experimental test *** study could fill the research insufficiency and provide significant guidance for future research on the solid-liquid transition mechanism of molten salts at micron scale.

关键词： molten salt non-isothermal phase transition solid-liquid boundary morphology liquid volume fraction micron scale melting process

A Comprehensive Study of a Low-Grade Heat-Driven Cooling and Power System Based on Heat Current Method

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Journal of Thermal Science 2024年第4期33卷 1523-1541页

作者： ZHAO Tian XU Ronghong XIN Yonglin HE Kelun MA Huan yuan mengdi CHEN Qun School of Energy Storage Science and Engineering North China University of TechnologyBeijing100144China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering MechanicsTsinghua UniversityBeijing100084China

Combined cooling and power(CCP)system driven by low-grade heat is promising for improving energy *** work proposes a CCP system that integrates a regenerative organic Rankine cycle(RORC)and an absorption chiller on both driving and cooling fluid *** system is modeled by using the heat current method to fully consider nonlinear heat transfer and heat-work conversion constraints and resolve its behavior *** off-design system simulation is performed next,showing that the fluid inlet temperatures and flow rates of cooling water as well as RORC working fluid strongly affect system *** off-design operation even becomes infeasible when parameters deviate from nominal values largely due to limited heat transfer capability of components,highlighting the importance of considering heat transfer constraints via heat current *** optimization aiming to minimize the total thermal conductance is also *** efficiency increases by 7.9%and decreases by 12.4%after optimization,with the hot fluid inlet temperature increase from 373.15 to 403.15 K and mass flow rate ranges from 10 to 30 kg/s,emphasizing the necessity of balancing system cost and performance.

关键词： combined cooling and power system organic Rankine cycle absorption chiller cascade heat utilization heat current method off-design analysis

The construction and optimization of engineered yeast chassis for efficient biosynthesis of 8-hydroxygeraniol

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mLife 2023年第4期2卷 438-449页

作者： Yu Zhang mengdi yuan Xinxin Wu Qiuhui Zhang Yuzhu Wang Liming Zheng Tsan-Yu Chiu Huiming Zhang Lei Lan Feng Wang Ying Liao Xuemei Gong Shirui Yan Yun Wang Yue Shen Xian Fu BGI Research ShenzhenChina BGI Research HangzhouChina Guangdong Provincial Key Laboratory of Genome Read and Write BGI ResearchShenzhenChina BGI Research ChangzhouChina

Microbial production of monoterpenoid indole alkaloids(MIAs)provides a sustainable and eco-friendly means to obtain compounds with high pharmaceutical ***,efficient biosynthesis of MIAs in heterologous microorganisms is hindered due to low supply of key precursors such as geraniol and its derivative 8-hydroxygeraniol catalyzed by geraniol 8-hydroxylase(G8H).In this study,we developed a facile evolution platform to screen strains with improved yield of geraniol by using the SCRaMbLE system embedded in the Sc2.0 synthetic yeast and confirmed the causal role of relevant genomic *** genome mining,we identified several G8H enzymes that perform much better than the commonly used CrG8H for 8-hydroxygeraniol production in *** further showed that the N-terminus of these G8H enzymes plays an important role in cellular activity by swapping ***,the combination of the engineered chassis,optimized biosynthesis pathway,and utilization of G8H led to the final strain with more than 30-fold improvement in producing 8-hydroxygeraniol compared with the starting ***,this study will provide insights into the construction and optimization of yeast cells for efficient biosynthesis of 8-hydroxygeraniol and its derivatives.

关键词： 8-hydroxygeraniol biosynthesis G8H SCRaMbLE synthetic yeast

基于泛函序列时变自回归滑动平均模型的弹箭时变模态参数递推估计方法

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兵工学报 2020年第11期41卷 2189-2197页

作者：余磊张永励袁梦笛刘瑞卿西安现代控制技术研究所陕西西安710065

随着弹簧系统朝着大型化、高速化、智能化发展,飞行状态下弹箭系统的固有特性对整体结构的影响不可忽视。针对弹箭在飞行状态下的时变模态参数辨识问题进行研究,基于泛函序列时变自回归滑动平均(FS-TARMA)模型,提出一种时变模态参数的... 详细信息

随着弹簧系统朝着大型化、高速化、智能化发展,飞行状态下弹箭系统的固有特性对整体结构的影响不可忽视。针对弹箭在飞行状态下的时变模态参数辨识问题进行研究,基于泛函序列时变自回归滑动平均(FS-TARMA)模型,提出一种时变模态参数的递推估计方法。该方法采用墨西哥帽小波基作为TARMA模型时变系数的空间基底,并借鉴于无结构化TARMA模型递推估计思想,将投影参数矩阵视为振动响应数据长度的变量,实现了投影参数矩阵的递推估计。通过有限单元法建立阿里安V号芯级运载火箭时变有限元模型,对所提方法进行验证。结果表明:递推辨识方法与传统批量算法相比,在辨识精度上,3阶模态频率辨识结果最大相对误差在5%以内;在计算效率上,递推辨识方法的计算时间缩短了9.38倍。

关键词：弹箭时变结构模态参数辨识递推估计泛函序列时变自回归滑动平均模型

硕士研究生创新能力影响因素分析——以林业工程学科为例

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科教文汇 2021年第13期 4-7页

作者：袁梦迪东北林业大学黑龙江哈尔滨150000

文章以某大学林业工程学科硕士研究生为调查样本,对研究生创新能力影响因素进行实证分析。结果表明:创新意识、创新成果、创新环境、创新交流均对研究生创新能力产生正向影响。同时根据实证结果,提出提高研究生创新能力的对策建议:完善... 详细信息

文章以某大学林业工程学科硕士研究生为调查样本,对研究生创新能力影响因素进行实证分析。结果表明:创新意识、创新成果、创新环境、创新交流均对研究生创新能力产生正向影响。同时根据实证结果,提出提高研究生创新能力的对策建议:完善研究生培养机制、加大科研经费投入、改善软件硬件条件、创新学术交流方式。

关键词：研究生创新能力影响因素林业工程

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压路机驾驶室告警信息优化设计研究

包装工程 2024年第16期45卷 455-462页

作者：王菊苑梦迪寇成龙中国矿业大学江苏徐州221116 徐州市工业设计学会江苏徐州221018 郑州时空隧道信息技术有限公司郑州450000

目的为了提高驾驶员在驾驶过程中对告警信息的认知效率,以便更好地做出反馈,进而降低事故的发生,提高安全性。方法通过分析压路机告警信息的呈现方式,并解析其设计要素,再用层次分析法确定设计要素的权重,从中筛选出影响告警信息认知效... 详细信息

目的为了提高驾驶员在驾驶过程中对告警信息的认知效率,以便更好地做出反馈,进而降低事故的发生,提高安全性。方法通过分析压路机告警信息的呈现方式,并解析其设计要素,再用层次分析法确定设计要素的权重,从中筛选出影响告警信息认知效率的关键设计要素,通过眼动生理实验对关键设计要素因子进行模拟实验,确定认知效率高的压路机驾驶室告警信息设计因子。结论在设计因子的基础上,完成压路机驾驶室告警信息设计方案,并通过眼动仪生理模拟实验确定最优设计方案,完成对告警信息认知效率的提升。

关键词：压路机驾驶室告警信息认知效率设计优化

基于可逆热致变色的动态体吸收太阳能光热存储相变材料

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中国科学：技术科学 2023年第3期53卷 341-352页

作者：袁梦迪刘陈煦徐超廖志荣叶锋刘顺凯华北电力大学能源动力与机械工程学院北京102206

相变材料(phase change material,PCM)有望解决热能储存和热管理等方面的问题.然而,随着瞬态熔体前沿远离热源,其能量密度和功率密度逐渐降低.在太阳能直接热利用过程中,传统充热的完成完全依赖于PCM本身的热扩散过程,低热导限制了PCM... 详细信息

相变材料(phase change material,PCM)有望解决热能储存和热管理等方面的问题.然而,随着瞬态熔体前沿远离热源,其能量密度和功率密度逐渐降低.在太阳能直接热利用过程中,传统充热的完成完全依赖于PCM本身的热扩散过程,低热导限制了PCM的充热速率.本文提出了基于可逆热致变色特性的动态相变材料(dynamic phase change material,Dyn PCM),可以自动控制光热界面位移紧跟熔体前沿,使相变材料在光热转换中的充热速率不受材料自身热导率限制.Dyn PCM由热致变色剂和主体PCM两部分组成,热致变色剂以2-苯氨基-3-甲基6-二丁氨基荧烷作为供电子体,2,2-双(4-羟苯基)丙烷作为受电子体及4-苄氧基苯基乙基葵酸酯作为溶剂成功实现无色-黑色的变换.主体PCM以石蜡为例,其中含83.3 wt.%石蜡含量的Dyn PCM_(5)潜热为154.38 kJ/kg,仅比石蜡降低6.6%,其透明态表现出与石蜡接近的透射率为91.2%.对比表明,Dyn PCM_(5)的充热速率比石蜡提升了260%.经80次循环后,Dyn PCM的基团未发生改变,充放热性能及透射率稳定性优异,仍具有良好的可逆的变色及充热能力.因此,本研究提出的热致变色复合Dyn PCM_(5)是一种有前景的太阳能储热材料,可进一步运用在太阳能直接吸热过程中.

关键词：动态相变材料熔体前沿热致变色相变储热太阳能

新时代提升林业工程学科研究生创新能力的思考

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大学（研究与管理） 2024年第5期 133-136页

作者：袁梦迪许民东北林业大学材料科学与工程学院黑龙江哈尔滨150000

进入新时代以来,我国研究生教育从快速发展转为高质量发展,提升研究生创新能力、培养拔尖创新人才是研究生高质量发展的必经之路,更是我国从研究生教育大国迈向研究生教育强国的必然要求。文章以林业工程学科研究生为研究对象,分析提升... 详细信息

进入新时代以来,我国研究生教育从快速发展转为高质量发展,提升研究生创新能力、培养拔尖创新人才是研究生高质量发展的必经之路,更是我国从研究生教育大国迈向研究生教育强国的必然要求。文章以林业工程学科研究生为研究对象,分析提升研究生创新能力的必要性和影响因素,提出了构建新型教学模式、建设“本硕博”一体化培养体系、搭建学术交流平台等对策,旨在为林业工程学科拔尖人才的培养提供参考。

关键词：创新能力林业工程研究生

课程研究:百年审视与未来想象——第16届上海国际课程论坛会议综述

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教育测量与评价 2019年第2期 56-61,64页

作者：权俊驰袁梦迪华东师范大学课程与教学研究所

为了促进国内外课程与教学研究领域的学术交流和经验分享,更好地推进基础教育课程改革的深入发展,教育部人文社会科学重点研究基地华东师范大学课程与教学研究所在课程研究一百周年的2018年,于11月2日～3日举办了第16届上海国际课程论... 详细信息

为了促进国内外课程与教学研究领域的学术交流和经验分享,更好地推进基础教育课程改革的深入发展,教育部人文社会科学重点研究基地华东师范大学课程与教学研究所在课程研究一百周年的2018年,于11月2日～3日举办了第16届上海国际课程论坛。本次论坛的主题为"课程研究:百年审视与未来想象",来自美国、德国、日本、韩国,以及我国香港、台湾、大陆地区的300余位专家学者共同反思课程研究的历史,审视课程研究的现实,探讨课程研究的经验和挑战,并进一步构想课程研究的美好未来。

关键词：课程改革课程研究研究范式