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Identification of potential indicators for testis quality in swamp eels(Monopterus albus)through metabolomics analysis

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Water Biology and Security 2023年第4期2卷 78-90页

作者： Fei Liu Xing Lin kaifeng meng Yuanyuan Chen Hairong Liu Yuanli Zhao Daji Luo Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture Institute of HydrobiologyThe Innovative Academy of Seed DesignHubei Hongshan LaboratoryChinese Academy of SciencesWuhan430072China College of Advanced Agricultural Sciences University of Chinese Academy of SciencesBeijing100049China Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou510642China

The swamp eel(Monopterus albus)is a commonly cultured freshwater *** and cultivation of fecund broodstock is crucial for efficient artificial reproduction in this ***,there are currently no guidelines for selecting high-quality males in *** study quantitatively investigated the sperm motility of male swamp eels during the breeding season by using computer-assisted sperm analysis *** in the proportion and number of motile sperm was observed between individual *** testes were grouped into high-quality and low-quality according to sperm *** parameters of the two groups were *** found that high-quality testes were longer(150±27 mm verses 127±19 mm)than low-quality ***,the proportion of testes with a dark appearance was slightly higher(58.3%verses 48.1%)in the high-quality group than in the low-quality *** analysis was conducted to compare the metabolite profiles of high-quality and low-quality ***,organic acids,glycerolipids,amino acids,sphingolipids,and nucleotides were the most abundant metabolites in the testes of swamp ***,135 differential metabolites were *** nucleotide derivatives,including 50-deoxyadenosine,20-deoxyadenosine,and ribosyl adenosine,were the most significantly enriched metabolites in highquality *** metabolites are potential indicators for the testis quality in ***,our work provides systematic and quantitative data about the physiological and biochemical characteristics of *** testis,which provides an evidential basis for the selection of high-fecundity parents to improve artificial reproduction efficiency of ***.

关键词： Monopterus albus Sperm motility Testis quality Metabolomics Nucleotide metabolites

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Surface-induced interaction of colloidal particles in isotropic liquid crystals

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Communications in Theoretical Physics 2024年第7期76卷 114-122页

作者： Hualing Zhang kaifeng Weng Rui Ma Department of Physics College of Physical Science and TechnologyXiamen UniversityXiamen 361005China Fujian Provincial Key Laboratory for Soft Functional Materials Research Research Institute for Biomimetics and Soft MatterXiamen UniversityXiamen 361005China

In this work,we study the interaction between two colloidal particles in a liquid crystal that is in the isotropic *** interaction is caused by surface-induced polarization of the liquid crystal molecules in the vicinity of the *** find that the interaction is short-ranged in both 2D and 3D *** symmetric homeotropic anchoring conditions,the interaction is *** under anti-symmetric homeotropic anchoring conditions,the interaction is repulsive at short distances but attractive at intermediate *** particle size has a strong impact on the effective interaction force.

关键词： surface-induced interaction colloidal particles liquid crystals

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An extended social force model on unidirectional flow considering psychological and behavioral impacts of hazard source

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Chinese Physics B 2024年第2期33卷 567-576页

作者：邓凯丰李梦胡祥敏陈涛 Institute of Public Safety Research Department of Engineering PhysicsTsinghua UniversityBeijing 100084China Anhui Province Key Laboratory of Human Safety Hefei 230601China Beijing Key Laboratory of Comprehensive Emergency Response Science Beijing 100084China

An accurate assessment of the evacuation efficiency in case of disasters is of vital importance to the safety design of buildings and street *** sources not only physically but psychologically affect the pedestrians,which may further alter their behavioral *** effect is especially significant in narrow spaces,such as corridors and *** study aims to integrate a non-spreading hazard source into the social force model following the results from a previous experiment and simulation,and to simulate unidirectional pedestrian flows over various crowd densities and clarity–intensity properties of the hazard *** integration include a virtual repulsion force from the hazard source and a decay on the social force *** simulations reveal(i)that the hazard source creates virtual bottlenecks that suppress the flow,(ii)that the inter-pedestrian push forms a stabilisation phase on the flow-density curve within medium-to-high densities,and(iii)that the pedestrians are prone to a less orderly and stable pattern of movement in low clarity–intensity scenarios,possibly with lateral collisions passing the hazard source.

关键词： evacuation social force model hazard source unidirectional pedestrian flow

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基于空间相关法的风电场风速多步预测模型

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电工技术学报 2013年第5期28卷 15-21页

作者：陈妮亚钱政孟晓风孟凯峰北京航空航天大学仪器科学与光电工程学院北京100191 中能电力科技开发有限公司北京100191

风电场风速的准确预测对于评估风电场接入电网的安全性与经济性有重要意义。本文基于空间相关法与支持向量机方法,提出了一种新的风速多步预测混合模型。文中首先提出使用相关系数作为判据的方法,选择模型的最优输入参数,以建立精确的... 详细信息

风电场风速的准确预测对于评估风电场接入电网的安全性与经济性有重要意义。本文基于空间相关法与支持向量机方法,提出了一种新的风速多步预测混合模型。文中首先提出使用相关系数作为判据的方法,选择模型的最优输入参数,以建立精确的分风向空间相关模型。在详细分析风向对预测精度的影响后,结合支持向量机(SVM)方法,以消除风向变化对空间相关模型的不利影响,最终得到预测精度高、性能稳定的混合模型。文中使用某风电场的实测数据进行建模验证,并与几种经典的风速预测算法相比较,结果证实该混合模型的预测精度有显著提高。

关键词：风速预测空间相关支持向量机混合模型

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Differences in Precipitation and Related Wind Dynamics and Moisture and Heat Features in Separate Areas of the South China Sea before and after Summer Monsoon Onset

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Advances in Atmospheric Sciences 2024年第8期41卷 1643-1660页

作者： Chunyan ZHANG Donghai WANG kaifeng ZHANG Wanwen HE Yanping ZHENG Yan XU Guangdong Meteorological Data Center Guangdong Meteorological BureauGuangzhou 510640China School of Atmospheric Sciences Sun Yat-sen UniversityGuangdong Province Key Laboratory for Climate Change and Natural Disaster StudiesKey Laboratory of Tropical Atmosphere-Ocean SystemMinistry of EducationZhuhai 519082China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China National Observation and Research Station of Coastal Ecological Environments in Macao Macao Environmental Research InstituteMacao University of Science and TechnologyMacao SAR 999078China Foshan Meteorological Service Foshan 528000China Ningjiang District Meteorological Bureau Songyuan 138000China

Using surface and balloon-sounding measurements, satellite retrievals, and ERA5 reanalysis during 2011–20, this study compares the precipitation and related wind dynamics, moisture and heat features in different areas of the South China Sea(SCS) before and after SCS summer monsoon onset(SCSSMO). The rainy sea around Dongsha(hereafter simply referred to as Dongsha) near the north coast, and the rainless sea around Xisha(hereafter simply referred to as Xisha) in the western SCS, are selected as two typical research subregions. It is found that Dongsha, rather than Xisha, has an earlier and greater increase in precipitation after SCSSMO under the combined effect of strong low-level southwesterly winds, coastal terrain blocking and lifting, and northern cold air. When the 950-h Pa southwesterly winds enhance and advance northward, accompanied by strengthened moisture flux, there is a strong convergence of wind and moisture in Dongsha due to a sudden deceleration and rear-end collision of wind by coastal terrain blocking. Moist and warm advection over Dongsha enhances early and deepens up to 200 h Pa in association with the strengthened upward motion after SCSSMO, thereby providing ample moisture and heat to form strong precipitation. However, when the 950-h Pa southwesterly winds weaken and retreat southward, Xisha is located in a wind-break area where strong convergence and upward motion centers move in. The vertical moistening and heating by advection in Xisha enhance later and appear far weaker compared to that in Dongsha, consistent with later and weaker precipitation.

关键词： Dongsha Xisha South China Sea summer monsoon onset precipitation wind dynamics moisture heat

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A Two-Layer Active Power Optimization and Coordinated Control for Regional Power Grid Partitioning to Promote Distributed Renewable Energy Consumption

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Energy Engineering 2024年第9期121卷 2479-2503页

作者： Wentao Li Jiantao Liu Yudun Li GuoxinMing kaifeng Zhang Kun Yuan Key Laboratory of Measurement and Control of CSE Southeast UniversityNanjing210096China China Electric Power Research Institute Nanjing210003China State Grid Shandong Electric Power Research Institute Jinan250003China

With the large-scale development and utilization of renewable energy,industrial flexible loads,as a kind of loadside resource with strong regulation ability,provide new opportunities for the research on renewable energy consumption problem in power *** paper proposes a two-layer active power optimization model based on industrial flexible loads for power grid partitioning,aiming at improving the line over-limit problem caused by renewable energy consumption in power grids with high proportion of renewable energy,and achieving the safe,stable and economical operation of power ***,according to the evaluation index of renewable energy consumption characteristics of line active power,the power grid is divided into several partitions,and the interzone tie lines are taken as the optimization ***,on the basis of partitioning,a two-layer active power optimization model considering the power constraints of industrial flexible loads is *** upper-layer model optimizes the planned power of the inter-zone tie lines under the constraint of the minimum peak-valley difference within a day;the lower-layer model optimizes the regional source-load dispatching plan of each resource in each partition under the constraint of theminimumoperation cost of the partition,so as to reduce the line overlimit phenomenon caused by renewable energy consumption and save the electricity cost of industrial flexible ***,through simulation experiments,it is verified that the proposed model can effectively mobilize industrial flexible loads to participate in power grid operation and improve the economic stability of power grid.

关键词： Renewable energy consumption active power optimization power grid partitioning industrial flexible loads line over-limit

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A-site assisted perovskite crystallization via ion-exchange MOFs for high efficient and stable perovskite solar cells

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Journal of Energy Chemistry 2024年第6期93卷 436-442,I0011页

作者： Xingrui Zhang Jian Zhang Wei Wang Boyuan Hu Yayu Dong Debin Xia kaifeng Lin Yulin Yang MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001HeilongjiangChina

Here,a novel strategy is proposed targeting the volatility of A-site cations and the disordered arrangement of perovskite grains through employing Cs~+contained metal-organic frameworks In-aip(Cs)obtained by ion-exchange and crystalline *** forces between Cs-O atoms split the pore channels of the pristine In-aip,endowing In-aip(Cs)with multidimensional charge transport channels,In addition,the partially freed Cs~+in the interlayer compensates for the vacancy of A-site cations during the perovskite preparation *** In-aip(Cs)modified perovskite films have a flat morphology,large grains and excellent optoelectronic *** from the high-quality perovskite films and faster charge extraction,the In-aip(Cs)-modified PSCs achieved a champion PCE of 23.03%,superior to the In-aip-modified(22.29%)and control device(21.13%),More importantly,the unencapsulated PSCs modified with In-aip(Cs)exhibited outstanding humidity and thermal *** a period of almost 1000 h,the unencapsulated In-aip(Cs)-modified device retained 85%of its initial PCE after storing in a glove box at 85℃,and retained 87%of the primary PCE upon storage in ambient condition at 25℃under a humidity of 40%.

关键词： Metal-organic frameworks PSCs Stability Defect passivation

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Species-specific and generalized allometric biomass models for eight Fagaceae species in the understory of evergreen broadleaved forests in subtropical China

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Journal of Forestry Research 2024年第4期35卷 156-170页

作者： Shengwang meng Qianyanzhou Ecological Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101People’s Republic of China

Quantifying the biomass of saplings in the regeneration component is critical for understanding biogeochemical processes of forest ***,accurate allometric equations have yet to be developed in sufficient *** develop species-specific and generalized allometric equations,154 saplings of eight Fagaceae tree species in subtropical China’s evergreen broadleaved forests were *** dendrometric variables,root collar diameter(d),height(h),and crown area(ca)were applied in the model by the weighted nonlinear seemingly unrelated regression *** only d as an input variable,the species-specific and generalized allometric equations estimated the aboveground biomass reasonably,with R _(adj)^(2) values generally>*** h and/or ca improved the fitting of some biomass components to a certain *** equations showed a relatively large coefficient of variation but comparable bias to species-specific *** in the absence of species-specific equations at a given location are generalized equations for mixed species *** developed regression equations can be used to accurately calculate the aboveground biomass of understory Fagaceae regeneration trees in China’s subtropical evergreen broadleaved forests.

关键词： Allometry Aboveground biomass Additivity Regeneration Subtropical China

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Multifunctional MOF@COF Nanoparticles Mediated Perovskite Films Management Toward Sustainable Perovskite Solar Cells

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Nano-Micro Letters 2024年第9期16卷 195-208页

作者： Yayu Dong Jian Zhang Hongyu Zhang Wei Wang Boyuan Hu Debin Xia kaifeng Lin Lin Geng Yulin Yang MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001HeilongjiangPeople’s Republic of China School of Materials Science and Engineering East China Jiaotong UniversityNanchang 330013JiangxiPeople’s Republic of China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangPeople’s Republic of China

Although covalent organic frameworks(COFs)with highπ-conjugation have recently exhibited great prospects in perovskite solar cells(PSCs),their further application in PSCs is still hindered by face-to-face stacking and aggregation ***,metal-organic framework(MOF-808)is selected as an ideal platform for the in situ homogeneous growth of a COF to construct a core-shell MOF@COF nanoparticle,which could effectively inhibit COF stacking and *** synergistic intrinsic mechanisms induced by the MOF@COF nanoparticles for reinforcing intrinsic stability and mitigating lead leakage in PSCs have been *** complementary utilization ofπ-conjugated skeletons and nanopores could optimize the crystallization of large-grained perovskite films and eliminate *** resulting PSCs achieve an impressive power conversion efficiency of 23.61%with superior open circuit voltage(1.20 V)and maintained approximately 90%of the original power conversion efficiency after 2000 h(30-50%RH and 25-30℃).Benefiting from the synergistic effects of the in situ chemical fixation and adsorption abilities of the MOF@COF nanoparticles,the amount of lead leakage from unpackaged PSCs soaked in water(<5 ppm)satisfies the laboratory assessment required for the Resource Conservation and Recovery Act Regulation.

关键词： Perovskite solar cells Covalent organic frameworks Metal-organic frameworks Lead leakage Stability

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基于非线性状态估计的风电机组变桨控制系统故障识别

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中国电机工程学报 2014年第S1期34卷 160-165页

作者：尹诗余忠源孟凯峰李闯王其乐中能电力科技开发有限公司北京市西城区100034

变桨系统是风力发电机组中控制算法复杂,设备故障率较高的子系统。当风机出现故障停机时,数据采集与监视控制(supervisory control and data acquisition,SCADA)系统在故障出现会显示出具体的故障信息,该具体故障信息往往包含多个,给风... 详细信息

变桨系统是风力发电机组中控制算法复杂,设备故障率较高的子系统。当风机出现故障停机时,数据采集与监视控制(supervisory control and data acquisition,SCADA)系统在故障出现会显示出具体的故障信息,该具体故障信息往往包含多个,给风机迅速定位故障类别、确认检修方式、及时有效地恢复生产造成了不利影响。因此,基于变桨运行数据的风力发电机组主故障识别对于提升机组可利用率及机组发电性能有着积极重要的意义。文中采用非线性状态估计技术作为数据挖掘方法,在某风电场机组SCADA数据基础上,分析机组变桨系统运行趋势及故障类型建立机组变桨控制系统主故障模型,并对该模型进行验证。研究结果表明,基于非线性状态估计的风电机组变桨控制系统主故障识别能够在多个故障信息中识别出主故障,次故障等,从而指导风场检修人员确定检修顺序,并为后续开展风机性能分析及评价提供了新的思路。

关键词：主故障非线性状态状态估计数据挖掘风电机组

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