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Zoning strategy of zonal modeling for thermally stratified large spaces

Building Simulation 2021年第5期14卷 1395-1406页

作者： yanyu lu Zhaojun Wang Jing Liu Jiankai Dong School of Architecture Harbin Institute of TechnologyHarbinHeilongjiang ProvinceChina Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information TechnologyHarbinHeilongjiang ProvinceChina

Large space buildings play a significant role in modern society because of their environmental advantages and market *** the zonal model is promising for the efficient and rapid evaluation of the stratified thermal environment,there is a lack of a reasonable and convenient zoning strategy with the advent of modern *** paper presents a universal and practical zonal model,in which a simplified momentum equation is applied to consider air momentum preservation,transformation,and ***,the zoning structure is generalized and ***,limiting the dimensionless temperature constraint between adjacent zones establishes the connection between thermal nonuniformity and zoning results ***,the dimension and number of zones should be restricted within reasonable ranges to satisfy the characteristics of zonal simulation and reach the criteria of *** further explore and validate the zonal model,a reduced-scale experimental model was constructed to replicate the thermal stratification in a mechanically ventilated large space by considering many crucial realistic factors.A particle image velocimetry(PIV)measurement was then conducted to visualize the airflow pattern and support the partition of *** results showed that the zonal simulation with adaptive zoning method can realize a similar accuracy with fewer zones and exhibit a better tolerance for zoning results compared to the conventional empirical zoning ***,a case study of an atrium was performed to demonstrate the practicality and efficiency of the method for long-term dynamic simulations of complex thermal environments and building energy use.

关键词： zoning method zonal simulation temperature gradient large space PIV

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Climate and Vegetation Drivers of Terrestrial Carbon Fluxes:A Global Data Synthesis

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Advances in Atmospheric Sciences 2019年第7期36卷 679-696页

作者： Shutao CHEN Jianwen ZOU Zhenghua HU yanyu lu Jiangsu Key Laboratory of Agricultural Meteorology Nanjing University of Information Science and TechnologyNanjing210044China College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing210095China School of Applied Meteorology Nanjing University of Information Science and TechnologyNanjing210044China Climate Center Anhui Weather BureauHefei230031China

The terrestrial carbon(C) cycle plays an important role in global climate change, but the vegetation and environmental drivers of C fluxes are poorly understood. We established a global dataset with 1194 available data across site-years including gross primary productivity(GPP), ecosystem respiration(ER), net ecosystem productivity(NEP), and relevant environmental factors to investigate the variability in GPP, ER and NEP, as well as their covariability with climate and vegetation *** results indicated that both GPP and ER increased exponentially with the increase in mean annual temperature(MAT)for all biomes. Besides MAT, annual precipitation(AP) had a strong correlation with GPP(or ER) for non-wetland *** leaf area index(LAI) was an important factor determining C fluxes for all biomes. The variations in both GPP and ER were also associated with variations in vegetation characteristics. The model including MAT, AP and LAI explained 53%of the annual GPP variations and 48% of the annual ER variations across all biomes. The model based on MAT and LAI explained 91% of the annual GPP variations and 92.9% of the annual ER variations for the wetland sites. The effects of LAI on GPP, ER or NEP highlighted that canopy-level measurement is critical for accurately estimating ecosystem–atmosphere exchange of carbon dioxide. The present study suggests a significance of the combined effects of climate and vegetation(e.g.,LAI) drivers on C fluxes and shows that climate and LAI might influence C flux components differently in different climate regions.

关键词： net ecosystem productivity gross primary productivity ecosystem respiration controlling factors vegetation model

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Assessment of CH_(4) flux and its influencing drivers in the rice-wheat agroecosystem of the Huai River Basin,China

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Journal of Integrative Agriculture 2024年第12期23卷 4203-4215页

作者： Xiaolan Yu Fangmin Zhang Yanqiu Fang Xiaohan Zhao Kaidi Zhang yanyu lu Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Jiangsu Key Laboratory of Agricultural Meteorology College of Ecology and Applied MeteorologyNanjing University of Information Science&TechnologyNanjing 210044China Anhui Institute of Meteorological Sciences/Anhui Province Key Laboratory of Atmospheric Science and Satellite Remote Sensing Hefei 230031China Shouxian National Climatology Observatory Huai River Basin Typical Farm Eco-Meteorological Experiment Field of China Meteorological AdministrationShouxian 232200China

To understand the CH_(4) flux variations and their climatic drivers in the rice-wheat agroecosystem in the Huai River Basin of China,the CH_(4) flux was observed by using open-path eddy covariance at a typical rice-wheat rotation system in Anhui Province,China from November 2019 to October *** variations and their drivers were then analyzed with the Akaike information criterion ***_(4) flux showed distinct diurnal variations with single peaks during 9:00-13:00 local *** highest peak was 2.15μg m^(-2)s^(-1)which occurred at 11:00 in the vegetative growth stage in the rice growing season(RGS).CH_(4) flux also showed significant seasonal *** average CH_(4)flux in the vegetative growth stage in the RGS(193.8±74.2 mg m^(-2)d^(-1))was the highest among all growth *** annual total CH_(4) flux in the non-rice growing season(3.2 g m^(-2))was relatively small compared to that in the RGS(23.9 g m^(-2)).CH_(4) flux increased significantly with increase in air temperature,soil temperature,and soil water content in both the RGS and the non-RGS,while it decreased significantly with increase in vapor pressure deficit in the *** study provided a comprehensive understanding of the CH_(4) flux and its drivers in the rice-wheat rotation agroecosystem in the Huai River Basin of *** addition,our findings will be helpful for the validation and adjustment of the CH_(4) models in this region.

关键词： CH_(4) flux eddy covariance method rice-wheat rotation agroecosystem Huai River Basin

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A new estimate of global soil respiration from 1970 to 2008

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Chinese Science Bulletin 2013年第33期58卷 4153-4160页

作者： CHEN ShuTao HUANG Yao XIE Wei ZOU JianWen lu yanyu HU ZhengHua School of Environmental Science and Engineering Nanjing University of Information Science and Technology State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of Sciences College of Resources and Environmental Sciences Nanjing Agricultural University Anhui Climate Center School of Applied Meteorology Nanjing University of Information Science and Technology

土壤呼吸(R s ) 是在陆上的生态系统加重我们碳周期的理解的关键过程之一。在有在最高、最低的估计之间的 70 Pg C a1 的差别的以前的全球 R s 估计的大无常遗体。因此，现在的学习试图估计全球年度 R s 并且用包括了气候的因素(温度和... 详细信息

土壤呼吸(R s ) 是在陆上的生态系统加重我们碳周期的理解的关键过程之一。在有在最高、最低的估计之间的 70 Pg C a1 的差别的以前的全球 R s 估计的大无常遗体。因此，现在的学习试图估计全球年度 R s 并且用包括了气候的因素(温度和降水) 和表层土(020 厘米) 的一个半机械学的、以经验为主地基于的模型在全球年度 R s 调查 interannual 和空间可变性器官的碳存储。从 147 个测量地点的年度 R s 的大约 657 出版研究在这元分析被包括。气候，表面空气温度，和土壤性质上的从 1970 ～ 2008 的全球数据集合是镇定的。蒙特卡罗方法被用来宣传模拟错误到全球 R s。结果显示吝啬的年度全球 R s 是 94.4 Pg C a1，增加在粗略地从 1970 ～ 2008 的 0.04 Pg C a1 (0.04% a1 ) 。R s 率增加了从更冷，更干燥并且少些玷污充满碳的区域到更温暖、更潮湿、更充满碳的区域。最高的 R s 率出现在热带森林里，当最低的在极、荒芜的区域时。年度 R s 与全球温度异例直接相关，建议在温度的 interannual 可变性为在预言的全球 R s 的 interannual 变化负责。全球 R s 从高纬度的地区增加了到低纬度的地区。进一步的研究被建议探索在土壤呼吸和植被人物之间的关系。

关键词：土壤呼吸估计年际变化陆地生态系统蒙特卡罗方法温度距平气候因素资源丰富

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Interannual variability in soil respiration from terrestrial ecosystems in China and its response to climate change

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Science China Earth Sciences 2012年第12期55卷 2091-2098页

作者： CHEN ShuTao HUANG Yao ZOU JianWen SHI YanShu lu yanyu ZHANG Wen HU ZhengHua School of Environmental Science and Engineering Nanjing University oflnformation Science and TechnologyNanjing 210044China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation Nanjing Agricultural UniversityNanjing 210095China Anhui Climate Center Hefei 230031China

Soil respiration is an important process in terrestrial carbon *** terrestrial ecosystems in China, quantifying the spatiotemporal pattern of soil respiration at the regional scale is critical in providing a theoretical basis for evaluating carbon *** this study, we used an empirically based, semi-mechanistic model including climate and soil properties to estimate annual soil respiration from terrestrial ecosystems in China from 1970 to *** further analyzed the relationship between interannual variability in soil respiration and climatic factors (air temperature and precipitation).Results indicated that the distribution of annual soil respiration showed clear spatial *** highest and lowest annual soil respiration rates appeared in southeastern China and northwestern China, respectively, which was in accordance with the spatial patterns of mean annual air temperature and annual *** the mean annual air temperature in northwestern China was higher than that in some regions of northeastern china, a greater topsoil organic carbon storage in northeastern China might result in the higher annual soil respiration in this *** contrast, lower temperature, less precipitation and smaller topsoil organic carbon pool incurred the lowest annual soil respiration in northwestern *** soil respiration from terrestrial ecosystems in China varied from 4.58 to 5.19 PgCa-1 between 1970 and *** this time period, on average, annual soil respiration was estimated to be 4.83 PgCa-1 .Annual soil respiration in China accounted for 4.93%-6.01% of the global annual soil CO2 *** interannual variability in soil respiration depended on the interannual variability in precipitation and mean air *** order to reduce the uncertainty in estimating annual soil respiration at regional scale, more in situ measurements of soil respiration and relevant factors (***, soil and vegetation) should be made simultane

关键词： China soil respiration temporal variability climate

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STUDY ON RECTANGULAR WAVEGUIDE GRATING SLOW-WAVE STRUCTURE WITH COSINE-SHAPED GROOVES

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Journal of Electronics(China) 2007年第3期24卷 384-389页

作者： lu Zhigang Wei yanyu Gong Yubin Wu Zhoumiao Wang Wenxiang School of Physical Electronics University of Electronic Science and Technology of China Chengdu 510054 China

This paper focuses on a new rectangular waveguide grating Slow-Wave Structure (SWS) with cosine-shaped grooves and studies the propagation characteristics of the wave in the SWS. By using the approximate field-matching conditions,the dispersion equation and the coupling impedance of this circuit are obtained. The dispersion curves and coupling impedances of the fundamental wave are calculated and the influences of the various geometrical dimensions are discussed. The results show that the bandwidth of the cosine-shaped groove SWS is much wider than that of rectangular-shaped groove one. And reducing the groove width can broaden the frequency-band and decrease the phase-velocity,while increment of the groove-depth can also decrease phase-velocity. For above cases,the coupling impedance is more than 16Ω. The present analysis will be helpful on further study and design of the RF systems used in millimeter wave Traveling Wave Tube (TWT).

关键词： Traveling Wave Tub (TWT) Rectangular waveguide grating Cosine-shaped groove Dispersion equation Coupling impedance

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The Significance and General Approaches of Climatic Carrying Capacity Assessment

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Chinese Journal of Urban and Environmental Studies 2016年第1期4卷 55-68页

作者： YU Li lu yanyu HUANG Wei XU Yuqing National Climate Center Anhui Climate Center Yunnan Climate Center

The construction of ecological civilization needs to take both environmental protection and socio-economic development into consideration. Climate is one of the important environmental resources; it is also a foundation which human and society development depend on. Climate changes have exerted significant global impacts, which will continue in the future and affect population, livelihoods, economy, resources, ecosystems and many other aspects. In the future development planning, we need to coordinate the change of climate system and its impacts, fully follow and abide by climatic rules, take into consideration climatic carrying capacity, define the natural ecosystem and the intensity and scale of human socio-economic activities which the climatic resources can carry. This article introduces some related research background about the carrying capacities of environment and resources, and brings out the concept of climatic carrying capacity. In addition, the article summarizes general approaches of climatic carrying capacity assessment and introduces two case studies of climatic carrying capacity to clarify the urgency and importance of climatic carrying capacity assessment, as well as its practical significance to socio-economic development. The assessment of climatic carrying capacity has just got off the ground, and is faced with many challenges. We suggest that the priority lies in constructing and improving the theoretical foundation and assessment framework of climatic carrying capacity;secondly, the assessment should be focused on practicality and operability in accordance with local conditions; thirdly, the assessment on climatic carrying capacity needs to be integrated with other disciplines, and the application areas and service objects should be broadened; and finally,carrying out the assessment of climatic carrying capacity, especially quantitative assessment,requires continuous innovation and further involvement of new technological methods.

关键词： Climate change climatic carrying capacity assessment method development suggestion

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孤独症谱系障碍的免疫相关机制与治疗研究进展

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中华儿科杂志 2022年第5期60卷 482-486页

作者：卢彦宇韩颖北京大学第一医院儿科北京100034

孤独症谱系障碍(ASD)是以社交障碍和行为异常为特征的神经发育障碍性疾病。目前的诊疗手段主要基于行为学特征,客观的诊断指标和疾病机制性治疗仍在研究中。越来越多的证据表明,免疫、肠道菌群和神经系统异常相互联系,共同参与ASD的发... 详细信息

孤独症谱系障碍(ASD)是以社交障碍和行为异常为特征的神经发育障碍性疾病。目前的诊疗手段主要基于行为学特征,客观的诊断指标和疾病机制性治疗仍在研究中。越来越多的证据表明,免疫、肠道菌群和神经系统异常相互联系,共同参与ASD的发病过程。综述ASD的免疫相关机制、基因和表观遗传学改变以及免疫治疗进展,可为ASD的早期诊断和治疗提供新思路。

关键词：孤独症谱系障碍神经系统异常诊疗手段行为异常社交障碍行为学特征发育障碍性疾病免疫治疗

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Climatic Characteristics of Hail and Risk Zoning of Its Disaster Factor in Anhui Province

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Meteorological and Environmental Research 2013年第8期4卷 32-35,38页

作者： Huayang Wen Hong Tian Weian Tang yanyu lu Rong Wu Anhui Meteorological Information Centre Anhui Provincial Climate Centre

[ Objective] The research aimed to study climatic characteristics of hail and dsk zoning of its disaster factor in Anhui Province. [Method] Based on the hail-day records from 82 weather stations in Anhui Province, Chinese Meteorologica/Disaster Dictionary （1951 to 2005） and The Yearbook of Meteorological Disaster in Anhui Province （2006 to 2009）, we discussed the climatic characteristic and dsk zoning of hail disaster in Anhui Province. [Result] The hail days exhibited significant interdecadal variability, and it had a significant negative correlation with annual mean minimum temperature. The hail usually occurred from March to August, most frequently in June but less in autumn and winter. It most likely took place from aftemoon to sunset. The spatial distribution showed that the hail occurred more in northeast of Huaibei, south of Dabie Mountain and some areas of Huangshan Mountain, but less in Jianghuai region. The index of hail intensity was defined by three factors, the diameter, duration and gust grade, and the percentile method was used to grade the intensity of the hail disaster. This work provided a possibility for quantitative assessment of the intensity of hail disaster. The results of hail disaster risk zoning in Anhui Province showed that high dsk zones were concentrated in northeast of Huaibei, and low risk zones were mainly in south of Huaihe River. Finally, vedfied by historic disaster, it showed that the results of risk zoning had a certain rationality and feasibility. Conclusion The research could provide reference basis for hail disaster defense and assessment.

关键词： Hail Climatic charactedstics Hail intensity index Disaster factor Risk zoning China

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基于CALPUFF模型的NO_2剩余大气环境容量测算及污染源布局优化——以合肥市为例

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环境污染与防治 2017年第12期39卷 1358-1362页

作者：卢燕宇孙维安徽省气象局安徽省气候中心安徽合肥230031 安徽省气象局安徽省大气科学与卫星遥感重点实验室安徽合肥230031 安徽省气象局安徽省公共气象服务中心安徽合肥230031

为有效防控城市大气环境污染,以CALPUFF模型为核心构建了NO_2剩余大气环境容量定量测算方法。在分析了CALPUFF模型适用性的基础上应用于合肥市,并进行排放源布局优化。结果表明,污染源对控制点的影响主要受距离和风向的影响,距离越近,... 详细信息

为有效防控城市大气环境污染,以CALPUFF模型为核心构建了NO_2剩余大气环境容量定量测算方法。在分析了CALPUFF模型适用性的基础上应用于合肥市,并进行排放源布局优化。结果表明,污染源对控制点的影响主要受距离和风向的影响,距离越近,并且处于主导风向下风向的地区,受源排放的影响越大。由于合肥市主要盛行东风,因此合肥市东部不宜设置污染源,在工业园区规划时应避免;相对来说西南方向新增污染源对合肥市的总体影响较小。目前,调整后合肥市NO_2剩余大气环境容量约为3.58万t/a,并且正在逐年减小。

关键词： NO2 CALPUFF模型剩余大气环境容量线性规划

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