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Design and dynamic analysis of a novel scroll compressor-expander unit for the CO2 air conditioning system in electric vehicles

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Science China Technological Sciences 2024年第12期67卷 3659-3672页

作者： hu haoyu YANG Xu CAO Feng YIN Xiang SONG YuLong School of Energy and Power Engineering Xi'an Jiaotong University

Transcritical CO2refrigeration cycle systems hold significant promise for improving the energy efficiency of air conditioning system in vehicles, diminishing reliance on traditional energy sources, and reducing environmental impact. Utilizing a scroll compressor-expander unit（SCEU） to recover energy during the expansion process enables the effective conversion of expansion work into useful work, thereby enhancing the efficiency of the entire refrigeration cycle. This paper provides a detailed description of the geometric structure of the SCEU, and based on this, conducts an exhaustive mechanical analysis of its orbiting scrolls and main shaft, thus establishing dynamic models. Computational results indicate that in transcritical CO2refrigeration systems, the SCEU aids in recovering expansion work, increasing the coefficient of performance（COP） by 8.2% under standard operating condition. Additionally, this paper pioneers in studying the dynamic characteristics of SCEU under variable *** is found that although the COP of the systems decreases with the rise of working pressure, compared to traditional systems, its rate of improvement progressively increases. Under conditions of negligible leakage and an isentropic efficiency of 60%, the SCEU can potentially increase the COP of the system by up to 9.8%.

关键词： transcritical CO2 refrigeration cycle systems air conditioning system in vehicles scroll compressor-expander unit dynamic models

Legacy of Hongxi Su:Pioneer of Chinese Cardiosurgery

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Protein & Cell 2022年第8期13卷 549-551页

作者： Sumin Yang haoyu hu Xin Zheng Shizhong Wang Li Yuan Department of Cardiovascular Surgery Affiliated Hospital of Qingdao UniversityQingdao 266001China Department of Operation Room Affiliated Hospital of Qingdao UniversityQingdao 266001China Department of Anaesthesiology Affiliated Hospital of Qingdao UniversityQingdao 266001China

*** Su(苏鸿熙)was born in Tongshan,Jiangsu Province,in January of 1915(Fig.1).He is the pioneer of Chinese cardiosurgery and one of the most renowned Chinese cardiothoracic surgeons,performing the first successful intracardiac surgery under extracorporeal circulation,as well as applying artificial blood vessels in aortic-carotid artery bypass surgery,shaping the cardiosurgery landscape of China.

关键词： Pioneer landscape artificial

Herbgenomics: A stepping stone for research into herbal medicine

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Science China(Life Sciences) 2019年第7期62卷 913-920页

作者： haoyu hu Xiaofeng Shen Baosheng Liao Lu Luo Jiang Xu Shilin Chen Institute of Chinese Materia Medica China Academy of Chinese Medicinal Sciences

From the prehistoric era until the publishing of the Compendium of Materia Medica and the first scientific Nobel Prize in the Chinese mainland for Tu's discovery on anti-malarial tablets,each milestone and stepping stone in the developmental history of herbal medicine involved intrepid exploration,bold hypothesis formulation,and cautious *** thousands of years of discovery and development,herbal research has entered a new era—the era of *** combines herbal and genomic research,bridging the gap between traditional herbal medicine and cutting-edge omics ***,it provides a general picture of the genetic background of traditional herbs,enabling researchers to investigate the mechanisms underlying the prevention and treatment of human diseases from an omics perspective.

关键词： herbgenomics herbal medicines omics potential application

Seasonal variations in the plant diet of the Chinese Monal revealed by fecal DNA metabarcoding analysis

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Avian Research 2022年第2期13卷 208-215页

作者： Bin Wang Yun Li Guiquan Zhang Jian Yang Cao Deng haoyu hu Long Zhang Xiaoqin Xu Caiquan Zhou Key Laboratory of Southwest China Wildlife Resources Conservation(Ministry of Education) China West Normal UniversityNanchong637002China Institute of Ecology China West Normal UniversityNanchong637002China Key Laboratory of State Forestry and Grassl and Administration on Conservation Biology of Rare Animalsin the Giant Panda National Park(China Conservation and Research Center for the Giant Panda) Dujiangyan611830China Key Laboratory of Animal Disease and human Health of Sichuan Province College of Veterinary MedicineSichuan Agricultural UniversityChengdu611130China Institute of Chinese Materia Medica China Academy of Chinese Medical SciencesBeijing100700China

The Chinese Monal(Lophophorus thuysii)is an alpine-obligate galliform species of global conservation *** has been listed as a first class protected wildlife species in China,requiring conservation actions during the 14 th Five-Year Plan ***,the diet composition of Chinese Monal and its seasonal variations have rarely been studied,constraining the effective conservation of the ***,we investigated the plant diet composition of the Chinese Monal and its seasonal variations using a DNA metabarcoding approach on fecal *** collected 190 fecal samples of the Chinese Monals from the central Qionglai Mountains located in China,and analyzed the plant diet of this species using a DNA metabarcoding *** profiling of higher plants in the fecal samples was performed using the second internal transcribed spacer(ITS2)*** analyses,including rarefaction curves,nonmetric multidimensional scaling(NMDS)and permutational multivariate analysis of variance(PERMANOVA),were used to explore the seasonal variations in diet *** Chinese Monal foraged a wide range of plant recipes composed of 35 families and 83 genera throughout the year,with Brassicaceae,Apiaceae,and Poaceae as the dominant families,and Cardamine as the dominant *** species consumed plants from 62 genera from 28 families during the breeding season(n=81)and 66 genera from 31 families during the non-breeding season(n=109).Further,the plant diet composition significantly varied between the breeding and non-breeding seasons,especially for the frequency of occurrence and relative read abundances at genus *** study analyzed the plant diet of the Chinese Monal at a high resolution for the first time,and the results revealed that the seasonal variations in its plant diet composition was adapted to plant phenology and foraging *** species,a previously confirmed important food resource for the Chinese Monal,were not detected in any fe

关键词： Chinese monal Conservation management Diet seasonality DNA metabarcoding Endangered species

Global Pharmacopoeia Genome Database is an integrated and mineable genomic database for traditional medicines derived from eight international pharmacopoeias

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Science China(Life Sciences) 2022年第4期65卷 809-817页

作者： Baosheng Liao haoyu hu Shuiming Xiao Guanru Zhou Wei Sun Yang Chu Xiangxiao Meng Jianhe Wei Han Zhang Jiang Xu Shilin Chen Institute of Chinese Materia Medica China Academy of Chinese Medical SciencesBeijing100700China Institute of Pharmacy Hubei University of Chinese MedicineWuhan430065China Institute of Medicinal Plant Development Chinese Academy of Medical SciencesBeijing100193China Pharmacy College Chengdu University of Traditional Chinese MedicineChengdu611137China Institute of Traditional Chinese Medicine Tianjin University of Traditional Chinese MedicineTianjin301617China

Genomic data have demonstrated considerable traction in accelerating contemporary studies in traditional medicine. However,the lack of a uniform format and dispersed storage limits the full potential of herb genomic data. In this study, we developed a Global Pharmacopoeia Genome Database(GPGD). The database contains 34,346 records for 903 herb species from eight global pharmacopoeias(Brazilian, Egyptian, European, Indian, Japanese, Korean, the Pharmacopoeia of the People’s Republic of China, and U.S. Pharmacopoeia’s Herbal Medicines Compendium). In particular, the GPGD contains 21,872 DNA barcodes from 867 species, 2,203 organelle genomes from 674 species, 55 whole genomes from 49 species, 534 genomic sequencing datasets from 366 species, and 9,682 transcriptome datasets from 350 species. Among the organelle genomes, 534 genomes from 366 species were newly generated in this study. Whole genomes, organelle genomes, genomic fragments, transcriptomes, and DNA barcodes were uniformly formatted and arranged by species. The GPGD is publicly accessible at http://*** and serves as an essential resource for species identification, decomposition of biosynthetic pathways, and molecular-assisted breeding analysis. Thus, the database is an invaluable resource for future studies on herbal medicine safety, drug discovery, and the protection and rational use of herbal resources.

关键词： Global Pharmacopoeia Genome Database herb traditional medicine genomics

Revisiting the gravity laws of inter-city mobility in megacity regions

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Science China Earth Sciences 2023年第2期66卷 271-281页

作者： Pengjun ZHAO haoyu hu Liangen ZENG Jun CHEN Xinyue YE College of Urban and Environmental Sciences Peking UniversityBeijing100871China School of Urban Planning and Design Peking University Shenzhen Graduate SchoolShenzhen518055China Laboratory for Laboratory for Earth Surface System and human-Earth Relations Ministry of Natural Resources of ChinaPeking University Shenzhen Graduate SchoolShenzhen518055China National Geomatics Center of China Beijing100048China Department of Landscape Architecture and Urban Planning Texas A&M UniversityCollege StationTX77843USA

Inter-city mobility is one of the most important issues in the UN Sustainable Development Goals,as it is essential to access the regional labour market,goods and services,and to constrain the spread of infectious *** the gravity model has been proved to be an effective model to describe mobility among settlements,knowledge is still insufficient in regions where dozens of megacities interact closely and over 100 million people *** addition,the existing knowledge is limited to overall population mobility,while the difference in inter-city travel with different purposes is unexplored on such a large geographic *** revisited the gravity laws of inter-city mobility using the 2.12 billion trip chains recorded by 40.48 million mobile phone users’trajectories in the Jing-Jin-Ji Region,which contains China’s capital ***,unlike previous studies,we found that non-commuting rather than commuting is the dominant type of inter-city mobility(89.3%).Noncommuting travellers have a travel distance 42.3%longer than commuting ***,we developed more accurate gravity models for the spatial distribution of inter-city commuting and non-commuting *** also found that inter-city mobility has a hierarchical structure,as the distribution of inter-city travel volume follows Zipf’s *** particular,the hierarchy of non-commuting travel volume among the cities is more in line with an ideal Zipf distribution than commuting *** findings contribute to new knowledge on basic inter-city mobility laws,and they have significant applications for regional policies on human mobility.

关键词： Mobility Inter-city Travel behaviour Megacity region Zipf’s law China

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50th anniversary of artemisinin:From the discovery to allele-aware genome assembly of Artemisia annua

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Molecular Plant 2022年第8期15卷 1243-1246页

作者： Jiang Xu Baosheng Liao Ling Yuan Xiaofeng Shen Xuejiao Liao Jigang Wang haoyu hu Zhihai huang Li Xiang Shilin Chen Institute of Chinese Materia Medica China Academy of Chinese Medical SciencesBeijing 100700China Key Laboratory of Quality Evaluation of Chinese Medicine of the Guangdong Provincial Medical Products Administration the Second Clinical CollegeGuangzhou University of Chinese MedicineGuangzhou 510006China Kentucky Tobacco Research and Development Center and Department of Plant and Soil SciencesUniversity of KentuckyLexingtonKY 40546USA institute of Medicinal Plant Development Chinese Academy of Medical SciencesBeijing 100193China Artemisinin Research Center China Academy of Chinese Medical SciencesBeijing 100700China Chengdu University of Traditional Chinese Medicine ChengduChina

Over the past half century,the fight against malaria has been a resounding success mainlydue to thediscoveryof *** to the World Health Organization(WHO),morbidity and mortality due to malaria have been cut by half sin... 详细信息

关键词： mortality malaria allele

Analysis of sampling strategy and design of quantitative evaluation method for sensitivity analysis in earth system model

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Analysis of sampling strategy and design of quantitative eva...

第32届中国气象学会年会

作者： Xin huang Tao Zhang haoyu hu Wei Xue Department of Computer Science and Technology Tsinghua University

In recent years,parameter estimationarises more and more attention in uncertainty analysis to reduce prediction error of earth system *** to the high dimensionality and nonlinearity,it requires huge computational *** select the most important parameters for tuning,many sensitivity approaches were brought into parameter *** to our evaluation,most of those methods cannot get theconsistent results and lackcriterion to *** the same time,sampling strategy is critical to the results of parameter sensitivity analysis,while it is often neglected in the *** this study,we propose a decomposition‐based method to evaluate the existing various sensitivity methods and develop a sampling strategyintegrated with confidence interval and posteriori distributionto acceleratesensitivity analysis for better *** is demonstrated that sensitivity analysis based on the sampling methodhelps identifying the most influential parameters more efficiently and effectively and then improve the efficiency of parameter estimation.

关键词： Analysis of sampling strategy and design of quantitative evaluation method for sensitivity analysis in earth system model

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涡旋膨胀机研究进展及展望

西安交通大学学报 2024年第3期58卷 1-14页

作者：杨旭胡昊宇曹锋西安交通大学能源与动力工程学院西安710049

随着“双碳”目标的提出,涡旋膨胀机作为回收低品位能量的机械装置备受关注。首先,对近年来涡旋膨胀机的理论研究成果进行了综述,主要包括型线理论、热动力学和计算流体力学(CFD)仿真。然后,对涡旋膨胀机在有机朗肯循环(ORC)中的应用进... 详细信息

随着“双碳”目标的提出,涡旋膨胀机作为回收低品位能量的机械装置备受关注。首先,对近年来涡旋膨胀机的理论研究成果进行了综述,主要包括型线理论、热动力学和计算流体力学(CFD)仿真。然后,对涡旋膨胀机在有机朗肯循环(ORC)中的应用进行了总结,梳理了涡旋膨胀机在跨临界CO_(2)制冷循环中的应用研究成果。最后,对涡旋膨胀机未来的研究方向进行了展望。结果表明:变壁厚涡旋膨胀机因其可以在不增加泄漏线长度的情况下增加内容积比,因此将成为未来型线优化的主要方向;CFD仿真已成为重要的研究工具;润滑油是影响涡旋膨胀机性能的关键因素,提高润滑油的黏度有利于提升效率,而过量的润滑油则会使其性能下降;工作压力是影响涡旋膨胀机性能的最主要的因素,过膨胀、欠膨胀以及泄漏现象都会使其性能下降。此外,涡旋膨胀压缩一体机集成了膨胀机和压缩机两个功能单元于一个机壳中,显著简化了系统结构并提高了能量回收效率,是提升新能源车用CO_(2)热泵空调系统性能的有效途径。基于当前的研究成果和行业需求,提出涡旋膨胀机未来应继续深入研究和优化型线设计、减少泄漏、优化工作压力等,以满足日益增长的能量回收和环境保护需求。

关键词：涡旋膨胀机 “双碳”目标有机朗肯循环涡轮压缩-膨胀一体机