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Experimental Study on a Multi-Evaporator Loop Heat Pipe with a Dual-Layer Structure Condenser

Journal of Thermal Science 2023年第4期32卷 1466-1476页

作者： LU Depu XIE Rongjian wen jiajia School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai200240China Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai200083China

A loop heat pipe(LHP)is a kind of passive heat transfer device that uses the latent heat of the working fluid and the capillary forces of the capillary *** demonstrates high heat transfer efficiency,long-distance heat transfer,and high pipeline *** multi-evaporator loop heat pipe(MeLHP)is a special loop heat pipe with multiple evaporators so that heat collection and emission from multiple heat sources can be *** this paper,a new type of the multi-evaporator loop heat pipe prototype with a dual-layer condenser was designed,which can ensure the uniform and symmetrical layout of *** working temperature was 20℃,and propylene was used as the working *** performance of the same evaporator in a single-loop LHP was considered as a *** experiment was conducted under two heating modes,***-evaporator heating and multi-evaporator heating,and the working stability of the prototype was verified by applying periodic heating power change and adverse elevation *** was observed that the prototype can be successfully started in different heating modes with a heat transfer limit of 230 *** the test,the four loops were different in heat transfer limit due to the differences of flow resistance,and less power distribution to the loop with lowest heat transfer limit was considered to be beneficial to the prototype’s ***,the prototype showed good heat sharing characteristic as the maximum temperature difference is low(smaller than 2 K in single-evaporator heating mode and 0.5 K in multi-evaporator heating mode).The prototype was of good operational reliability and found to be adaptable to the adverse elevation and cyclic variation of the heating power to a certain extent.

关键词： multi-evaporator loop heat pipe dual-layer condenser heat sharing characteristic propylene variable heating power adverse elevation

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地球静止轨道LAR防静电白漆太阳吸收比变化分析

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航天器工程 2024年第4期33卷 44-49页

作者：文佳佳谢荣建钟思源程锦铭陈凡胜中国科学院上海技术物理研究所上海200083 上海理工大学上海200093

LAR防静电白漆具有低吸收发射比,能够喷涂于不同形状的物体表面,是重要的航天器热控系统组成部分。文章收集2颗地球静止轨道卫星的相机遮光罩外表面喷涂LAR防静电白漆的在轨7年和4年数据,结合遮光罩在轨热分析模型,得到白漆太阳吸收比... 详细信息

LAR防静电白漆具有低吸收发射比,能够喷涂于不同形状的物体表面,是重要的航天器热控系统组成部分。文章收集2颗地球静止轨道卫星的相机遮光罩外表面喷涂LAR防静电白漆的在轨7年和4年数据,结合遮光罩在轨热分析模型,得到白漆太阳吸收比随在轨时间的变化规律。研究结果表明:在轨2年后,白漆太阳吸收比由0.200退化为0.330,5年后变为0.357,年退化率由7.90%降低至0.55%,呈现逐年减小的趋势;根据该退化模型,预测10年后白漆太阳吸收比为0.357。利用热分析模型及在轨数据,能够得到白漆在轨退化性能,为航天器热控设计提供数据支撑,满足航天器长寿命及高效散热的需求。

关键词：地球静止轨道 LAR防静电白漆太阳吸收比退化性能

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濛坝河治理河段防洪现状及生态防洪堤设计

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云南水力发电 2024年第6期40卷 159-162页

作者：王春兰文佳佳宋亮毕节市勘测设计研究院贵州毕节551700 西安理工大学陕西西安710048

中小型河流防洪治理是水美乡村的关键内容,也是乡村振兴战略实施的重要举措。根据濛坝河封闭防洪体系和水生态文明建设新要求,结合治理河段地形地质条件及防洪现状,提出新建与加固防洪堤、清淤疏浚河道相结合的固岸防冲生态治理思路。... 详细信息

中小型河流防洪治理是水美乡村的关键内容,也是乡村振兴战略实施的重要举措。根据濛坝河封闭防洪体系和水生态文明建设新要求,结合治理河段地形地质条件及防洪现状,提出新建与加固防洪堤、清淤疏浚河道相结合的固岸防冲生态治理思路。通过分段修建格宾石笼生态式和浆砌石重力式防洪堤与上下游构建闭合防洪体系,治理河段防洪标准和行洪能力得到提高,河道水生态环境得到改善。

关键词：河道治理水生态环境防洪堤格宾挡墙

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地膜残留微塑料对土壤性质及微生物的影响研究进展

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山东化工 2024年第3期53卷 95-97,100页

作者：温嘉佳陈梓仪苏丹刘沙沙肇庆学院环境与化学工程学院广东省环境健康与资源利用重点实验室广东肇庆526061

塑料地膜的使用给农业生产带来了利益,其在土壤中经过各种作用形成地膜残留微塑料,对土壤的性质及微生物产生影响。该综述主要总结了地膜残留微塑料对土壤的物理/化学性质的影响,归纳了地膜残留微塑料存在下微生物多样性、组成、群落功... 详细信息

塑料地膜的使用给农业生产带来了利益,其在土壤中经过各种作用形成地膜残留微塑料,对土壤的性质及微生物产生影响。该综述主要总结了地膜残留微塑料对土壤的物理/化学性质的影响,归纳了地膜残留微塑料存在下微生物多样性、组成、群落功能的变化,并在此基础上对地膜残留微塑料的研究方向进行了展望。

关键词：地膜残留微塑料土壤性质微生物

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Biosynthesis of rumbrins and inspiration for discovery of HIV inhibitors

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Acta Pharmaceutica Sinica B 2022年第11期12卷 4193-4203页

作者： Beifen Zhong Jun Wan Changhui Shang jiajia wen Yujia Wang Jian Bai Shan Cen Youcai Hu State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100050China Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeiing 100050China

Investigation on how nature produces natural compounds with chemical and biological diversity at the genetic level offers inspiration for the discovery of new natural products and even their biological *** polyketide rumbrin(1)is a lipid peroxide production and calcium accumulation inhibitor,which contains a chlorinated pyrrole moiety that is a rare chemical feature in fungal natural ***,we identify the biosynthetic gene cluster(BGC)rum of 1 and its isomer 12E-rumbrin(2)from Auxarthron umbrinum DSM3193,and elucidate their biosynthetic pathway based on heterolo-gous expression,chemical complementation,and isotopic *** show that rumbrins are assembled by a highly reducing polyketide synthase(HRPKS)that uniquely incorporates a proline-derived pyrrolyl-CoA starer unit,and followed by methylation and *** precursor directed biosynthesis was able to yield a group of rumbrin ***,inspired by the presence of a human immunodeficiency virus(HIV)-Nef associated gene in the rum cluster,we predicted and pharmacologically demonstrated rumbrins as potent inhibitors of HIV at the nanomolar *** work enriches the recognition of unconventional starter units of fungal PKSs and provides a new strategy for genome mining-guided drug discovery.

关键词： Rumbrins Polyketide Precursor-directed biosynthesis Resistance gene Anti-HIV activity

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Transition-metal free trifluoromethylimination of alkenes enabled by direct activation of N-unprotected ketimines

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Chinese Chemical Letters 2024年第9期35卷 155-159页

作者： Boqiang Wang Yongzhuo Xu jiajia Wang Muyang Yang Guo-Jun Deng wen Shao Key Laboratory for Green Organic Synthesis and Application of Hunan Province Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of EducationCollege of ChemistryXiangtan UniversityXiangtan 411105China Department School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007China

A highly site-selective intermolecular trifluoromethylimination of activated and unactivated olefins was reported under transition-metal-and photosensitizer-free *** newly developed strategy provides straightforward and efficient access to diverse value-added vicinal trifluoromethyl amines without resorting to the pre-functionalized *** experiments demonstrate that the approach proceeded through CF_(3)and iminyl two-radicals process,which were generated directly from commercially available benzophenone imine in a novel electron-donor mode via a SET process activated by the bifunctional hypervalent iodine *** synthetic potential of the protocols was further showcased via the condensation/amination sequential cascade,and transformations to accessβ-CF_(3)primary amines.

关键词： Transition-metal free Alkenes difunctionalization Amination Trifluoromethylation Single-electron transfer

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Multidimensional hollow SiO_(2)/C nanofibers modified by magnetic nanocrystals for electromagnetic energy conversion and lithium battery storage

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Nano Research 2024年第8期17卷 7301-7314页

作者： Chen Han Qi Zheng Juncheng Jin jiajia Zhang wen-Qiang Cao Kun Xiang Min Zhang Mao-Sheng Cao Anhui Provincial Laboratory of Biomimetic Sensor and Detecting Technology College of Materials and Chemical EngineeringWest Anhui UniversityLu’an 237012China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Department of Physics Beijing Technology and Business UniversityBeijing 100048China

Multifunctional materials are powerful tools to support the advancement of energy conversion *** with prominent electromagnetic and electrochemical properties can realize the conversion of electromagnetic energy and solve the subsequent storage ***,an electrospinning-thermal reduction method is employed to construct ultrafine nickel nanoparticle modified porous SiO_(2)/C(Ni-SiO_(2)/C)hollow nanofibers as promising materials for applications in both electromagnetic wave absorption(EMA)and lithium-ion ***,when used as an EMA material,the reflection loss(RL)of Ni-SiO_(2)/C can reach−47.8 dB at 15.8 GHz with a matching thickness of 2.2 *** excellent microwave absorption performance can be attributed to the enhanced conduction loss,polarization relaxation,synergistic magnetic loss,and preferred impedance matching,which result from multi-component magnetic/dielectric synergy and the unique interconnected multidimensional hollow ***,the electronic conductivity and electrochemical activity of the samples are significantly enhanced due to the uniform distribution of ultrafine Ni nanoparticles in the amorphous SiO_(2)/C ***,the hierarchical hollow porous structure provides sufficient free space for volume change during lithiation/delithiation ***,the Ni-SiO_(2)/C nanocomposite exhibits a high reversible capacity of 917.6 mAh·g^(−1)at 0.1 A·g^(−1).At a high current density of 2 A·g^(−1),a capacity of 563.9 mAh·g^(−1)can be maintained after 300 *** energy conversion-storage device is designed to store waste electromagnetic energy in the form of useful electrical *** work inspires the development of high-performance bifunctional materials.

关键词： Ni-SiO_(2)/C nanofiber electromagnetic absorption lithium-ion storage electrospinning multidimensional structure

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Landscape ecological risk assessment and its driving factors in the Weihe River basin,China

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Journal of Arid Land 2024年第5期16卷 603-614页

作者： CHANG Sen WEI Yaqi DAI Zhenzhong XU wen WANG Xing DUAN jiajia ZOU Liang ZHAO Guorong REN Xiaoying FENG Yongzhong College of Agronomy Northwest A&F UniversityYangling 712100China

Weihe River basin is of great significance to analyze the changes of land use pattern and landscape ecological risk and to improve the ecological basis of regional *** on land use data of the Weihe River basin in 2000,2010,and 2020,with the support of Aeronautical Reconnaissance Coverage Geographic Information System(ArcGIS),GeoDa,and other technologies,this study analyzed the spatial-temporal characteristics and driving factors of land use pattern and landscape ecological *** showed that land use structure of the Weihe River basin has changed significantly,with the decrease of cropland and the increase of forest land and construction *** the past 20 a,cropland has decreased by 7347.70 km2,and cropland was mainly converted into forest land,grassland,and construction *** fragmentation and dispersion of ecological landscape pattern in the Weihe River basin were improved,and land use pattern became more ***,landscape ecological risk of the Weihe River basin has been *** landscape ecological risk area decreased by 19,177.87 km2,high landscape ecological risk area decreased by 3904.35 km2,and moderate and low landscape ecological risk areas continued to *** is worth noting that landscape ecological risks in the upper reaches of the Weihe River basin are still relatively serious,especially in the contiguous areas of high ecological risk,such as Tianshui,Pingliang,Dingxi areas and some areas of Ningxia Hui Autonomous *** ecological risk showed obvious spatial dependence,and high ecological risk area was *** the driving factors,population density,precipitation,normalized difference vegetation index(NDVI),and their interactions are the most important factors affecting the landscape ecological risk of the Weihe River *** findings significantly contribute to our understanding of the ecological dynamics in the Weihe River basin,providing crucial insights for sustainable mana

关键词： land use ecological risk spatiotemporal distribution geographic detector driving factors

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一种提供用户偏好选择的Web服务组合方法

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高技术通讯 2007年第3期17卷 243-248页

作者：温嘉佳陈俊亮彭泳北京邮电大学网络与交换国家重点实验室北京100876

分析了用户对于组合的Web服务的一些软性的偏好,对这些偏好的表达和基于这些偏好的Web服务组合进行了研究,提出了一种提供用户偏好选择的Web服务组合方法。该方法利用模糊约束来表达用户的偏好,将用户的偏好和满意程度转化成为模糊约束... 详细信息

分析了用户对于组合的Web服务的一些软性的偏好,对这些偏好的表达和基于这些偏好的Web服务组合进行了研究,提出了一种提供用户偏好选择的Web服务组合方法。该方法利用模糊约束来表达用户的偏好,将用户的偏好和满意程度转化成为模糊约束满足问题,进而使用分支定界法对层次化任务网络（HTN）进行分解。实验结果表明,用户的满意程度有显著的提高。

关键词： Web服务服务组合层次化任务网络模糊约束满足问题

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新型SMPDP菱形单元结构的研究

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真空科学与技术学报 2010年第1期30卷 16-21页

作者：温佳佳屠彦杨兰兰东南大学显示技术研究中心南京210096

为了提高等离子体显示单元的亮度和放电效率,本文采用三维流体模型对新型荫罩式等离子体显示板(SMPDP)的菱形单元结构进行了优化。研究了放电单元中的荫罩小孔结构改变对寻址期和维持期放电的影响。详细分析了小孔取向平行寻址电极和垂... 详细信息

为了提高等离子体显示单元的亮度和放电效率,本文采用三维流体模型对新型荫罩式等离子体显示板(SMPDP)的菱形单元结构进行了优化。研究了放电单元中的荫罩小孔结构改变对寻址期和维持期放电的影响。详细分析了小孔取向平行寻址电极和垂直寻址电极条件下电场和壁电荷的分布,以及对寻址时间、真空紫外辐射量和放电效率的影响。模拟结果表明:当小孔垂直寻址电极、长度和宽度分别为240μm和120μm时为最佳结构,通过优化小孔结构可以获得较高的寻址速度和放电效率,又可保证荧光粉的涂覆面积。

关键词：等离子体显示板(PDP) 荫罩式等离子体显示板(SMPDP) 流体模型放电效率

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