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Individual exposure assessment of microplastics in airborne particle matter 认领 引用
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作者 LIU Fanchen YANG Yujue +9 位作者 YUN Jianghui ZHAO Xingru AN Lihui LIU Di YU Ruozhen ZHAO Yaxian ZHANG Bing TANG Junhao YUAN Chungang LIU Guorui 《地球环境学报》 CSCD 2026年第2期361-371,共11页
Background,aim,and scope Microplastics are plastic particles with a diameter of less than 5 mm.Microplastics are emerging contaminants resulting from human activities,which have attracted significant attention from bo... Background,aim,and scope Microplastics are plastic particles with a diameter of less than 5 mm.Microplastics are emerging contaminants resulting from human activities,which have attracted significant attention from both the scientific community and the general public.Microplastics have been listed as one of the four major emerging pollutants in China.Microplastics have been detected in various matrices,including air,soil,lake water,rivers,and even in food and drinking water,posing potential health risks to humans.Atmospheric environment serves as both a significant source and sink for microplastics,with fine particle matters(PM2.5)acting as a crucial carrier for microplastics in the atmosphere.The inhalation of microplastics contained within PM2.5presents potential hazards to the respiratory system.However,researchers have yet to quantify the amount of microplastics inhaled through PM2.5.In this study,personal exposure samplers were employed to simulate the process of human inhalation of microplastics via PM2.5.The factors influencing the concentration of microplastics in the atmosphere under varying environmental conditions were analyzed.The primary aims of this study were to determine the levels and profiles of microplastics in atmospheric PM2.5and evaluate the human exposure to these pollutants through air inhalation.Materials and methods In this study,conducted in Beijing,China,an individual exposure particulate matter sampler was used to simulate human breathing and continuously collect microplastics in ambient air under daily working and living environments.The sampling period was from September 2023 to April 2024,and a total of 40 valid PM2.5samples were collected and analyzed.For sample testing,thermal decomposition pretreatment was first performed on the collected PM2.5samples,followed by gas chromatography-mass spectrometry to accurately identify and quantify five primary types of microplastics in PM2.5.Results The total concentration of the five types of microplastics in atmospheric PM2.5ranged from approximately 3.6μg/m3to 976μg/m3,including a high content(up to 505μg/m3)of low-density polyethylene(PE).The individual exposure to microplastics via inhalation of PM2.5ranged from 52μg/m3to 14054μg/d.Both weather conditions and human activities can clearly affect the concentrations and distribution of microplastics.Under moderate to severe pollution conditions,PM2.5was found to contain high concentrations(400-600μg/m3)of five types of microplastics.In areas with intense human activities and high population density,the microplastics concentrations soared to 976μg/m3,with individual exposure levels reaching 14054μg/d.Discussion The study on five common types of microplastics in ambient air reveals that the concentration of atmospheric microplastics is influenced by multiple factors due to the inherent instability of the atmospheric environment.Notably,the concentration of PE in PM2.5is generally higher than that of other microplastics.In three-quarters of the samples,the concentration of PE exceeds that of the other four types of microplastics by one to two orders of magnitude.Meteorological conditions such as wind,haze,and sandstorms are primary factors affecting ambient air quality and play a significant role in determining the concentration and distribution of microplastics.Additionally,population density and human activities are crucial factors influencing the concentration of microplastics in air.Conclusions Our study reveals a significant correlation between elevated atmospheric PM2.5concentrations(under severe pollution conditions such as sandstorms)and increased microplastic levels.Notably,even during periods of relatively low pollution(characterized by clear skies and strong winds),microplastic concentrations also exhibit a substantial rise.Furthermore,due to the increased usage of plastic products,microplastic concentrations tend to rise significantly with higher population densities.In this research,we employed personal exposure samplers to simulate the human inhalation of microplastics contained within PM2.5.By analyzing microplastic concentrations across various venues,we were able to assess the potential human exposure to microplastics.Recommendations and perspectives In future research,it is imperative to identify the sources of microplastics by investigating the factors influencing their concentration.This approach will enable the development of targeted strategies to minimize human exposure to inhalable microplastics and mitigate the potential for severe health risks associated with microplastic pollution. 展开更多
关键词 microplastics individual exposure pyrolysis mass spectrometry
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基于GEO-Studio数值模拟的尾矿堆积坝安全稳定性分析 认领 引用
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作者 阮顺领 谈尚旗 +3 位作者 刘迪 南欣 李家旭 孟令煊 《有色金属（矿山部分）》 CAS 2026年第4期190-200,共11页
针对复杂降雨条件下尾矿坝稳定性规律不明确的问题,本文以洛阳某尾矿坝为对象,采用饱和-非饱和渗流理论与极限平衡法,结合相似理论构建了理想化三维坝体模型,并运用数值模拟系统分析了连续暴雨、连续大雨及间歇性暴雨工况下的渗流场与... 针对复杂降雨条件下尾矿坝稳定性规律不明确的问题,本文以洛阳某尾矿坝为对象,采用饱和-非饱和渗流理论与极限平衡法,结合相似理论构建了理想化三维坝体模型,并运用数值模拟系统分析了连续暴雨、连续大雨及间歇性暴雨工况下的渗流场与坝体稳定性。结果表明,不同降雨强度、持续时间及降雨模式均显著影响坝体内部饱和度分布,进而导致安全系数明显变化,其中连续暴雨工况对稳定性的影响最为显著。研究揭示了降雨入渗对尾矿堆积坝稳定性的影响机制,为尾矿库的后期安全运行与加固设计提供了重要技术依据。 展开更多
关键词 尾矿坝 渗流 三维数值模拟 降雨工况 稳定性分析 安全系数
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The first discovery of non-avian dinosaur egg clutch(Macroolithus yaotunensis,Elongatoolithidae)from the Upper Cretaceous Qiupa Formation of Tantou Basin 认领 引用
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作者 ZHU Xu-Feng CHANG Fei +10 位作者 LI Yu ZHANG Xu-Huang GAO Dian-Song WANG Qiang QIU Rui WANG Xiao-Lin LIU Di JIA Song-Hai JIA Guang-Hui ZHANG Jian-Hua XU Li 《古脊椎动物学报（中英文）》 CAS CSCD 北大核心 2025年第2期159-172,共14页
The Upper Cretaceous of Tantou Basin in western Henan has yielded many vertebrate fossils,which are featured by several non-avian dinosaurs.Meanwhile,studies on their eggs were yet inadequate though many eggshells hav... The Upper Cretaceous of Tantou Basin in western Henan has yielded many vertebrate fossils,which are featured by several non-avian dinosaurs.Meanwhile,studies on their eggs were yet inadequate though many eggshells have been reported.The newly discovered material 41HⅤ0199 was excavated from the Upper Cretaceous Qiupa Formation in 2021.The block preserves eight complete eggs arranged in two partial rings that form a partial clutch,and there are some scattered eggshells preserved closely with the block,showing a concave-up to concave-down ratio of 54.5:45.5,which indicates that the scattered eggshells come from the clutch and the clutch had been partially broken before it was buried.Based on morphological and microstructural characteristics,the eggs and eggshells can be assigned to Macroolithus yaotunensis(Elongatoolithidae),an oospecies known to be related to oviraptorids,which leads Yulong mini to be its probable producer.Besides,some eggshells show microstructural signs indicating egg retention,which marks the second example of egg retention in the oofamily Elongatoolithidae. 展开更多
关键词 Tantou Basin Upper Cretaceous Qiupa Formation dinosaur egg Macroolithus
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Regulatory effect of glycyrrhizic acid on renal injury in fluoride-exposed mice 认领 引用
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作者 Li Meiyan LüRongrong +5 位作者 Song Junming Cheng Lili Qiao Xia Liu Di Qiao Hongping Wu Xiaoying 《浙江大学学报（农业与生命科学版）》 CAS CSCD 北大核心 2026年第4期679-696,共18页
To investigate the regulatory effect of glycyrrhizic acid(GA)against kidney injury in fluoride-exposed mice,fifty male C57BL/6J mice were randomly divided into five groups:control group,sodium fluoride(NaF)treatment g... To investigate the regulatory effect of glycyrrhizic acid(GA)against kidney injury in fluoride-exposed mice,fifty male C57BL/6J mice were randomly divided into five groups:control group,sodium fluoride(NaF)treatment group,NaF+low-dose GA treatment group,NaF+medium-dose GA treatment group,and NaF+highdose GA treatment group.After a 90 d continuous fluoride exposure treatment,it was found to significantly increase F-concentrations in serum and urine and cause renal morphological damage.Experimental detection revealed that serum creatinine(SCr)and blood urea nitrogen(BUN)levels were elevated and mRNA expression of renal function-related genes was up-regulated in mice.Meanwhile,it was found to promote oxidative stress response,increase proinflammatory factor levels,disrupt ferroptosis-related gene mRNA and protein expression,and reduce glutathione peroxidase 4(GPX4)expression.In contrast,GA treatment effectively mitigated these alterations across almost all indicators.Spearman correlation analysis indicated a significant association between ferroptosis and renal dysfunction,oxidative stress,and inflammatory response.In vitro experiments further confirmed that fluoride exposure induced ferroptosis,while GA inhibited this process.These findings suggest that GA alleviates fluoride-induced kidney injury,potentially through the inhibition of ferroptosis.This study provides valuable insights for the prevention and treatment of fluorosis and elucidates the potential application value of licorice extract. 展开更多
关键词 fluoride exposure glycyrrhizic acid kidney ferroptosis inflammatory response oxidative stress
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Potentilla anserina polysaccharide alleviates cadmium-induced oxidative stress and apoptosis of H9c2 cells by regulating the MG53-mediated RISK pathway 认领 引用 被引量：7
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作者 ZHAO Lixia CHENG Ju +3 位作者 LIU Di GONG Hongxia BAI Decheng SUN Wei 《Chinese Journal of Natural Medicines》 SCIE CAS CSCD 2023年第4期279-291,共13页
Oxidative stress plays a crucial role in cadmium(Cd)-induced myocardial injury.Mitsugumin 53(MG53)and its mediated reperfusion injury salvage kinase(RISK)pathway have been demonstrated to be closely related to myocard... Oxidative stress plays a crucial role in cadmium(Cd)-induced myocardial injury.Mitsugumin 53(MG53)and its mediated reperfusion injury salvage kinase(RISK)pathway have been demonstrated to be closely related to myocardial oxidative damage.Potentilla anserina L.polysaccharide(PAP)is a polysaccharide with antioxidant capacity,which exerts protective effect on Cd-induced damage.However,it remains unknown whether PAP can prevent and treat Cd-induced cardiomyocyte damages.The present study was desgined to explore the effect of PAP on Cd-induced damage in H9c2 cells based on MG53 and the mediated RISK pathway.For in vitro evaluation,cell viability and apoptosis rate were analyzed by CCK-8 assay and flow cytometry,respectively.Furthermore,oxidative stress was assessed by 2',7'-dichlorodihydrofluorescein diacetate(DCFH-DA)staining and using superoxide dismutase(SOD),catalase(CAT),and glutathione/oxidized glutathione(GSH/GSSG)kits.The mitochondrial function was measured by JC-10 staining and ATP detection assay.Western blot was performed to detect the expression of proteins related to MG53,the RISK pathway,and apoptosis.The results indicated that Cd increased the levels of reactive oxygen species(ROS)in H9c2 cells.Cd decreased the activities of SOD and CAT and the ratio of GSH/GSSG,resulting in decreases in cell viability and increases in apoptosis.Interestingly,PAP reversed Cd-induced oxidative stress and cell apoptosis.Meanwhile,Cd reduced the expression of MG53 in H9c2 clls and inhibited the RISK pathway,which was mediated by decreasing the ratio of p-AktSer473/Akt,p-GSK3βSer9/GSK3β and p ERK1/2/ERK1/2.In addition,Cd impaired mitochondrial function,which involved a reduction in ATP content and mitochondrial membrane potential(MMP),and an increase in the ratio of Bax/Bcl-2,cytoplasmic cytochrome c/mitochondrial cytochrome c,and Cleaved-Caspase 3/Pro-Caspase 3.Importantly,PAP alleviated Cd-induced MG53 reduction,activated the RISK pathway,and reduced mitochondrial damage.Interestingly,knockdown of MG53 or inhibition of the RISK pathway attenuated the protective effect of PAP in Cd-induced H9c2 cells.In sum,PAP reduces Cd-induced damage in H9c2 cells,which is mediated by increasing MG53 expression and activating the RISK pathway. 展开更多
关键词 Potentilla anserina L. Cadmium MG53 RISK pathway Oxidative stress Apoptosis Polysaccharide
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Synthesis of Silica-Dispersed NiMo Hydrodesulfurization Catalysts 认领 引用 被引量：2
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作者 Liu Di Liu Lihua +1 位作者 Li Guangci Liu Chenguang 《China Petroleum Processing & Petrochemical Technology》 CAS 2010年第4期18-22,共5页
Silica-dispersed NiMo hydrodesulfurization catalysts were synthesized by the deposition-precipitation method.For comparative purposes,bulk NiMo catalysts were obtained by co-precipitation.The silica-dispersed NiMo cat... Silica-dispersed NiMo hydrodesulfurization catalysts were synthesized by the deposition-precipitation method.For comparative purposes,bulk NiMo catalysts were obtained by co-precipitation.The silica-dispersed NiMo catalyst had highly active metals content.Silica was employed to disperse active metals for full utilization of active components.The BET analysis showed that the silica-dispersed NiMo catalysts had a high surface area(147.0 m2/g)and pore volume(0.27 mL/g),whereas the bulk NiMo catalysts exhibited a very low surface area(87.5 m2/g).Transmission electron microscopy results proved that the active components were dispersed on the SiO2 substrate.X-ray diffraction patterns of the silicadispersed NiMo catalyst and the bulk NiMo catalyst were indexed to NiMoO4.The hydrodesulfurization activity of silicadispersed NiMo catalysts was much higher than that of reference catalysts and could be up to twice greater than those of commercial NiMo alumina-supported systems per gram of catalyst.The activity testing results also demonstrated that the silica-dispersed NiMo catalyst was an effective hydrodesulflarization catalyst. 展开更多
关键词 hydrodesulfurization NiMo SiO2 Gel Surface area
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Cloning and Sequence Analysis of Y-box Binding Protein Gene in Min Pig 认领 引用 被引量：1
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作者 Zhang Dong-jie Liu Di +2 位作者 Wang Liang He Xin-miao Wang Wen-tao 《Journal of Northeast Agricultural University(English Edition)》 CAS 2014年第1期52-55,共4页
In order to study the gene sequence of Min pig Y-box binding protein （YB-1） gene, the complete coding sequence of Min pig YB-1 gene was cloned by RT-PCR, the sequence features were analyzed by some software and onli... In order to study the gene sequence of Min pig Y-box binding protein （YB-1） gene, the complete coding sequence of Min pig YB-1 gene was cloned by RT-PCR, the sequence features were analyzed by some software and online website. The results showed that the complete CDS of Min pig Y-box was found to be 975 bp long, encoding 324 amino acids. It contained a conserved cold shock domain and several phosphorylation sites, but had no transmembrane domains, and was consistent with a protein found in the cytoplasm. Min pig YB-1 nucleotides shared high similarity （61.37%- 97.66%） with other mammals. 展开更多
关键词 Min pig Y-box binding protein sequence feature
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Study on Genetic Diversity among Soybean in Heilongjiang Province 认领 引用 被引量：2
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作者 HU Guofu HU Xiaomei +2 位作者 CHANG Ying LIU Di HU Baozhong 《Journal of Northeast Agricultural University(English Edition)》 CAS 2006年第1期11-15,共5页
Genetic characters of 10 soybean breeds in Heilongjiang Province were studied using RAPD technique. We calculated the genetic similarity and genetic distance, made the cluster analysis, and also studied the genetic re... Genetic characters of 10 soybean breeds in Heilongjiang Province were studied using RAPD technique. We calculated the genetic similarity and genetic distance, made the cluster analysis, and also studied the genetic relationship among the 10 breeds. We found 93 amplification segments by RAPE） analysis, in which there were 70 polymorphism segments, 75.26% of amplification segments, using 13 random primers, 11, 12, 5, 4, 7, 8, 3, 7, 2, 5, 10, 10, 9 amplificated bands were found. There were 7.15 bands per primer in average, The genetic similarity among the breeds ranged from 0.6848 to 0.9019, and the genetic distance ranged from 0.0981 to 0.3152. Genetic relationship between 90035 and 9674 was the closest, and between Heifeng 27 and 90035 was the farthest. Protein analysis revealed that the closest genetic relationship was between 90035 and 90024, and the farthest was between 1330 and Sui 4, and between 1330 and Heinong 39. 展开更多
关键词 soybean RAPD protein genetic character
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Association between the SUMO4 M55V Polymorphism and Susceptibility to Type 2 Diabetes Mellitus:A Meta-analysis 认领 引用
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作者 ZHANG Qun LIU Di +3 位作者 ZHAO Zhong Yao SUN Qi DING Li Xiang WANG You Xin 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2017年第4期288-295,共8页
Objective The aim of this study is to determine whether the SUMO4 M55V polymorphism is associated with susceptibility to type 2 diabetes mellitus （T2DM）. Methods A meta-analysis was performed to detect the potential... Objective The aim of this study is to determine whether the SUMO4 M55V polymorphism is associated with susceptibility to type 2 diabetes mellitus （T2DM）. Methods A meta-analysis was performed to detect the potential association of the SUMO4 M55V polymorphism and susceptibility to T2DM under dominant, recessive, co-dominant （homogeneous and heterogeneous）, and additive models. Results A total of eight articles including 10 case-control studies, with a total of 2932 cases and 2679 controls, were included in this meta-analysis. The significant association between the SUMO4 M55V polymorphism and susceptibility to T2DM was observed in the dominant model （GG ＋ GA versus AA： OR = 1.21, 95% CI = 1.05-1.40, P = 0.009）, recessive model （GG versus GA ＋ AA： OR = 1.29, 95% CI = 1.07-1.356, P = 0.010）, homozygous model （GG versus AA： OR = 1.41, 95% CI = 1.06-1.56, P = 0.001）, and additive model （G versus A： OR = 1.18, 95% CI = 1.08-1.29, P = 0.001）, and marginally significant in the heterozygous model （GA versus AA： OR = 1.16, 95% CI = 0.98-1.36, P = 0.080）. In subgroup analyses, significant associations were observed in the Chinese population under four genetic models excluding the heterozygous model, whereas no statistically significant associations were observed in the Japanese population under each of the five genetic models. Conclusion The meta-analysis demonstrated that the G allele of the SUMO4 M55V polymorphism could be a susceptible risk locus to T2DM, mainly in the Chinese population, while the association in other ethnic population needs to be further validated in studies with relatively large samples. 展开更多
关键词 SUMO4 Type 2 diabetes mellitus （T2DM） Polymorphisms Meta-analysis
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基于PI3K/AKT/NF-κB通路探究加味泽泻汤对高脂饲喂大鼠血管内皮保护作用机制 认领 引用 被引量：3
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作者 赫雨薇 刘迪 +5 位作者 官蜀钧 宫铭 吴文龙 李婷 张艳 赵昕 《中华中医药学刊》 CAS CSCD 北大核心 2026年第3期120-128,I0041-I0044,共9页
目的探讨加味泽泻汤通过磷脂酰肌醇3激酶(PI3K)/蛋白激酶B(AKT)/核因子κB(NF-κB)通路对高脂血症内皮损伤的保护作用及潜在机制探析。方法将30只SD雄性大鼠(4周龄)随机分为正常组6只,造模组24只,其中造模组24只通过饲喂高脂饮食20周后... 目的探讨加味泽泻汤通过磷脂酰肌醇3激酶(PI3K)/蛋白激酶B(AKT)/核因子κB(NF-κB)通路对高脂血症内皮损伤的保护作用及潜在机制探析。方法将30只SD雄性大鼠(4周龄)随机分为正常组6只,造模组24只,其中造模组24只通过饲喂高脂饮食20周后构建高脂血症模型。将造模成功的24只大鼠随机分为4组,模型组、加味泽泻汤正常剂量组、高剂量组及西药阿托伐他汀钙组。经过4周用药干预后,通过检测大鼠体质量、总胆固醇(TC)、甘油三酯(TG)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)等血脂四项、内皮缩血管肽-1(ET-1)及一氧化氮(NO)等内皮功能相关指标及苏木素-伊红(HE)染色对主动脉组织进行染色后,评价加味泽泻汤治疗高脂血症内皮损伤的治疗效果。随后利用网络药理学分析进一步探究发挥作用的药效机制,通过TCMSP、Swiss Target Prediction、HERB、ETCM和BATMAN数据库预测了中药活性成分及靶点;从GeneCards、OMIM、DisGeNET、TTD数据库中获取了与高脂血症和内皮功能障碍相关的靶点。通过韦恩图及蛋白质-蛋白质相互作用(PPI)网络和富集分析寻找机制通路,并采用实时荧光定量PCR(RT-qPCR)法检测各组大鼠PI3K、AKT1、NF-κB、IL-6、TNF mRNA表达及Western blot法检测内皮损伤通路相关蛋白p-PI3K、PI3K、p-AKT、AKT、NF-κB的表达水平。结果与正常组比较,模型组大鼠TC、TG、LDL-C、ET-1水平升高(P<0.01),HDL-C、NO水平降低(P<0.05,P<0.01)。网络药理学分析结果获得加味泽泻汤的活性成分包括24-乙酰泽泻醇A、山柰酚、泽泻醇A、泽泻醇B、泽泻醇C、白术内酯I等29个;PPI网络及拓扑分析后共得到IL-6、AKT1、TNF、IL-1B、STAT3等62个核心靶点,富集通路主要涉及PI3K/AKT信号通路、脂质与动脉粥样硬化、HIF-1信号通路、TNF信号通路等156条信号通路。动物实验验证结果显示,与模型组比较,加味泽泻汤可上调PI3K、AKT1、NF-κB、IL-6、TNF等mRNA表达水平,及p-PI3K、PI3K、p-AKT、AKT、NF-κB蛋白表达(P<0.01)。结论加味泽泻汤具有良好地降低血脂、抑制炎症因子的表达,保护血管内皮功能的作用,其机制可能是通过激活PI3K/AKT/NF-κB信号通路实现的。 展开更多
关键词 加味泽泻汤 高脂血症 内皮功能障碍 网络药理学 PI3K/AKT/NFκB通路
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基于YOLOv11s融合结构相似性的深井钻孔内壁环状全景自适应拼接方法 认领 引用 被引量：2
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作者 刘迪 张泽家 +2 位作者 卢才武 顾清华 江松 《煤炭学报》 EI CAS CSCD 北大核心 2026年第2期1747-1759,共13页
为实现深井钻孔内壁形态的高质量全景可视化,克服传统图像拼接方法在自动化水平、拼接质量及处理效率方面的局限,提出了一种融合YOLOv11s(You Only Look Once)与结构相似性(Structural Similarity Index Method)的智能图像拼接方法。研... 为实现深井钻孔内壁形态的高质量全景可视化,克服传统图像拼接方法在自动化水平、拼接质量及处理效率方面的局限,提出了一种融合YOLOv11s(You Only Look Once)与结构相似性(Structural Similarity Index Method)的智能图像拼接方法。研究旨在突破现有技术对人工干预依赖性强、易产生接缝、亮度不均及视觉伪影等瓶颈,提升钻孔内壁图像拼接的精度、连续性与整体效率,为后续钻孔质量评估与爆破设计参数优化提供高保真、高一致性的视觉数据支持。在技术方法上,引入轻量化YOLOv11s目标检测网络,充分利用其深层特征提取能力与多尺度检测优势,精准识别钻孔图像中的圆形边界,自动提取圆心坐标与半径参数,有效克服因镜头畸变、光照不均或局部遮挡引起的定位偏差;随后,基于精确的几何参数进行极坐标变换,将环形内壁区域逐帧展开为矩形图像,保留原始纹理信息的同时构建空间有序的展开图集。在此基础上,创新性地融合SSIM结构相似性度量与滑动窗口匹配策略,通过系统分析相邻展开图像在重叠区域内的亮度、对比度与结构一致性,自适应搜索最优配准位置,实现高效、无缝的图像拼接,最终生成完整内壁环状全景图。试验结果表明,该方法在处理240张图像时,拼接耗时仅为34.98 s,同样实验条件下,相较于传统SIFT特征点匹配方法所需的271.35 s,该方法耗时更短且拼接结果具有更高的视觉连贯性与几何保真度,抑制了接缝错位、亮度跳变和纹理重复等常见问题。创新在于提出了一种自动化拼接流程,融合YOLOv11s与SSIM算法,提升了拼接效率与视觉质量。 展开更多
关键词 YOLOv11s 结构相似性算法 环状全景 图像拼接 内窥视频
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漯河地区亚洲玉米螟越冬代种群与温度关系分析 认领 引用 被引量：2
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作者 侯艳红 杜梦园 +9 位作者 李卫华 陈莉 沈海龙 王文豪 刘迪 陈琦 范志业 师兴凯 李世民 黄建荣 《玉米科学》 CAS CSCD 北大核心 2026年第1期111-117,共7页
为了解亚洲玉米螟越冬代种群与温度的相关关系,指导玉米螟预测预报和田间防治策略,本研究对2006-2023年河南省漯河市自动虫情测报灯和当地温度的历史数据进行分析。结果表明,18年来河南漯河地区1-6月有效温度累积值显著升高100.32℃,超... 为了解亚洲玉米螟越冬代种群与温度的相关关系,指导玉米螟预测预报和田间防治策略,本研究对2006-2023年河南省漯河市自动虫情测报灯和当地温度的历史数据进行分析。结果表明,18年来河南漯河地区1-6月有效温度累积值显著升高100.32℃,超过发育起点温度天数显著增加9.37 d;玉米螟越冬代发生关键时间始见日、高峰日和终见日分别显著提前了14.91、10.08和11.17 d。线性回归发现,有效温度累积值与越冬代的发生关键时间呈显著负相关,有效温度累积值每上升10℃,始见日、高峰日和终见日分别提前1.35、0.81和0.53 d。 展开更多
关键词 玉米 亚洲玉米螟 越冬代 发生期提前 有效温度累积值 相关分析
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黄河流域生态系统服务与居民福祉的多类型关系及驱动因素 认领 引用 被引量：2
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作者 刘迪 郭琳 +2 位作者 陈海 史琴琴 吴孔森 《水土保持研究》 CAS CSCD 北大核心 2026年第1期372-382,391,共11页
[目的]厘清黄河流域生态系统服务与居民福祉的多类型关系及其驱动因素,为推进黄河流域生态保护和高质量发展提供科学参考。[方法]以黄河流域(河南段)为例,运用空间自相关、耦合协调度、相对发展度3种方法测度2000—2022年生态系统服务... [目的]厘清黄河流域生态系统服务与居民福祉的多类型关系及其驱动因素,为推进黄河流域生态保护和高质量发展提供科学参考。[方法]以黄河流域(河南段)为例,运用空间自相关、耦合协调度、相对发展度3种方法测度2000—2022年生态系统服务和居民福祉多类型关系的时空演变特征,采用随机森林模型探究3类关系驱动因素差异,在分区基础上提出差异化空间治理方案。[结果](1)研究区生态系统服务价值小幅波动下降,呈现西南高、东北低的空间分布特征;居民福祉指数波动上升,呈现三核驱动、两翼滞后的空间分布格局,区域差异逐渐缩小。(2)生态系统服务—福祉空间关联由显著正向空间集聚逐渐转为随机分布,且东北部平原农区L—L模式集聚;耦合协调性逐渐提升,呈西南高、东北低的空间特征;相对发展状态存在非均衡性,逐步向良性互动方向演进。(3)生态系统服务—福祉多类型关系驱动因素存在明显不同。地形起伏度起决定性作用,其他因素则各有侧重。(4)生态系统服务—福祉多类型关系的组合存在空间异质性。[结论]研究区生态系统服务与福祉多类关系及其驱动因素空间差异明显,需聚焦区域核心矛盾,制定差异化治理路径,通过多维关系协同优化实现人地系统可持续发展。 展开更多
关键词 生态系统服务 居民福祉 关系类型 随机森林 黄河流域(河南段)
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2020-2024年黄淮麦区强筋和中强筋国审小麦品种的品质及育种策略分析 认领 引用 被引量：2
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作者 袁谦 赵永涛 +6 位作者 张中州 甄士聪 望俊森 张锋 陈莉 刘迪 周扬 《作物杂志》 北大核心 2026年第2期39-50,共12页
为了解近年(2020-2024)黄淮麦区强筋和中强筋国审小麦品种的品质状况及育种策略,基于品种间亲缘系数进行聚类分析,并结合系谱信息和品质性状进行综合分析。结果表明,2020-2024年黄淮麦区审定的强筋和中强筋小麦品种数量呈逐年增加的趋... 为了解近年(2020-2024)黄淮麦区强筋和中强筋国审小麦品种的品质状况及育种策略,基于品种间亲缘系数进行聚类分析,并结合系谱信息和品质性状进行综合分析。结果表明,2020-2024年黄淮麦区审定的强筋和中强筋小麦品种数量呈逐年增加的趋势。企业与科研单位的强筋小麦育种能力相当,育成品种分别占品种总数的43.3%和45.0%。品种间亲缘系数总体不高,平均为0.0640,但亲本利用较为集中,主要由10个强筋核心亲本衍生,不同亲本对品质指标的提升有所侧重。强筋小麦品种的选育主要采用“优质品种/优质品种”的单交育种方式。未来强筋小麦育种应重视利用国外优质品种及小麦近缘属植物创制优异种质,短期内可更多地利用中麦578和济麦44等新创制的优异强筋种质拓宽遗传基础。 展开更多
关键词 黄淮麦区 强筋小麦 中强筋小麦 亲缘系数 系谱 品质
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功能化的三维石墨烯电化学传感器检测牡蛎中铅残留 认领 引用 被引量：2
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作者 崔闻宇 杨曼玉 +2 位作者 刘迪 吕春艳 张乔 《中国无机分析化学》 CAS 北大核心 2026年第4期513-521,共9页
为检测牡蛎中痕量铅残留,本文采用2-胍基苯并咪唑功能化的三维石墨烯为敏感元件,离子液体1-乙基-3-甲基咪唑六氟磷酸盐(EMIPF6)为黏合剂,对玻碳电极进行修饰制备电化学传感器,并建立了阳极溶出伏安法检测痕量铅离子的新方法。在富集... 为检测牡蛎中痕量铅残留,本文采用2-胍基苯并咪唑功能化的三维石墨烯为敏感元件,离子液体1-乙基-3-甲基咪唑六氟磷酸盐(EMIPF6)为黏合剂,对玻碳电极进行修饰制备电化学传感器,并建立了阳极溶出伏安法检测痕量铅离子的新方法。在富集电位-1.2 V、富集时间180 s条件下,0.2 mol/L HAc-NaAc缓冲溶液中,Pb2+溶出峰值电流与其浓度的线性范围为0~300μg/L,检出限为0.006μg/L(S/N=3)。方法学考察结果符合检测方法的相关要求,在牡蛎中铅离子残留检测中,阳极溶出伏安法与电感耦合等离子体质谱法测定结果一致性较好,且阳极溶出伏安法检测快速、操作方便。 展开更多
关键词 三维石墨烯 电化学传感器 铅离子检测 阳极溶出伏安法
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斑岩钼矿床中岩浆热液活动对铼富集的影响:以新疆苏云河Mo和白山Re-Mo矿床为例 认领 引用 被引量：1
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作者 洪涛 焦鹏利 +6 位作者 吴楚 张悦新 徐兴旺 游军 郑啸 刘荻 张璋 《岩石学报》 SCIE EI CAS CSCD 北大核心 2026年第1期250-272,共23页
斑岩钼矿床是工业铼(Re)的主要来源,Re主要以类质同象形式进入辉钼矿晶格,对成矿流体物理化学条件极为敏感。本文以新疆西准噶尔苏云河Mo矿和东天山白山Re-Mo矿为研究对象,综合岩相学、矿相学和辉钼矿-石英LA-ICP-MS微量元素分析等手段... 斑岩钼矿床是工业铼(Re)的主要来源,Re主要以类质同象形式进入辉钼矿晶格,对成矿流体物理化学条件极为敏感。本文以新疆西准噶尔苏云河Mo矿和东天山白山Re-Mo矿为研究对象,综合岩相学、矿相学和辉钼矿-石英LA-ICP-MS微量元素分析等手段,对比研究不同成矿阶段Re的含量变化及其控制因素。结果表明,两矿床辉钼矿均可分为片状或薄片状的Ⅰ型和细粒状集合体的Ⅱ型,Ⅱ型辉钼矿中Re含量系统性高于Ⅰ型,未见明显的“壳-核”式分带,辉钼矿普遍发育膝折构造,反映叠加成矿作用。苏云河矿床辉钼矿Re含量在各阶段变化幅度较大,岩浆-热液过渡阶段(T2)Re含量明显升高,局部样品表现出高S/Mo比值,指示Re在该阶段发生局部富集并出现过早结晶;白山矿床各阶段辉钼矿Re含量变化较小,成矿流体f HCl/f HF比值相对稳定,有利于Re在流体中的持续运移。综合石英Ti-温度计、流体包裹体及微量元素约束,认为成矿温度降低是控制Re进入辉钼矿晶格的首要因素,pH值和卤素组成则通过调节Re络合物形态控制其在成矿流体与辉钼矿之间的分配行为,二者共同决定了苏云河和白山矿床Re的差异性富集。 展开更多
关键词 辉钼矿 铼 成矿流体 苏云河 白山 差异性富集
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Modification of Titanium Surfaces via Surface-initiated Atom Transfer Radical Polymerization to Graft PEG-RGD Polymer Brushes to Inhibit Bacterial Adhesion and Promote Osteoblast Cell Attachment 认领 引用
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作者 陈琦 LIU Di +2 位作者 GONG Yuejiao XIAO Qun 李志安 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第5期1225-1231,共7页
Implant-related infection is one of the key concerns in clinical medicine, so the modification of titanium to inhibit bacterial adhesion and support osteoblast cell attachment is important. In this article, two strate... Implant-related infection is one of the key concerns in clinical medicine, so the modification of titanium to inhibit bacterial adhesion and support osteoblast cell attachment is important. In this article, two strategies were used to examine the above effects. First, modification of titanium via surface-initiated atom transfer radical polymerization（ATRP） was performed. The surface of the titanium was activated initially by a silane coupling agent. Well-defined polymer brushes of poly（ethylene glycol） methacrylate were successfully tethered on the silane-coupled titanium surface to form hydration shell to examine the anti-fouling effect. Second, functionalization of the Ti-PEG surface with RGD was performed to examine the anti-bacterial adhesion and osteoblast cell attachment ability. The chemical composition of modified titanium surfaces was characterized by X-ray photoelectron spectroscopy（XPS）. Changes in surface hydrophilicity and hydrophobicity were characterized by static water contact angle measurements. Results indicated that PEG-RGD brushes were successfully tethered on the titanium surface. And anti-bacterial adhesion ability and osteoblast cell attachment ability were confirmed by fluorescence microscopy and scanning electron microscopy. Results indicated that PEG can inhibit both bacterial adhesion and osteoblast cell attachment, while PEG-RGD brushes can not only inhibit bacterial adhesion but also promote osteoblast cell attachment. 展开更多
关键词 modification of titanium ATRP anti-bacterial adhesion osteoblast cell attachment PEG RGD brushes
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非富勒烯掺杂对平面异质结有机光电探测器的光电特性影响 认领 引用 被引量：1
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作者 单正叶 刘頔 +3 位作者 张侃 倪程鹏 孙金芳 程斌 《中国光学（中英文）》 EI CAS CSCD 北大核心 2026年第1期19-28,共10页
研究了在P3HT:PC71BM的平面异质结有机光电探测器体系中掺杂非富勒烯小分子IEICO-4F到受体部分对该器件光电特性的影响。采用溶液法制备不同掺杂比例的活性层薄膜,通过电流-电压特性、外量子效率、紫外-可见-近红外吸收光谱及光致发光... 研究了在P3HT:PC71BM的平面异质结有机光电探测器体系中掺杂非富勒烯小分子IEICO-4F到受体部分对该器件光电特性的影响。采用溶液法制备不同掺杂比例的活性层薄膜,通过电流-电压特性、外量子效率、紫外-可见-近红外吸收光谱及光致发光光谱等表征手段,结合原子力显微镜分析形貌演变规律。实验结果表明,IEICO-4F的引入显著拓宽活性层吸收光谱,拓宽至近红外区域(700~900 nm),并通过互补吸收光谱提升光量子捕获效率。当优化掺杂比例为30%时,器件的光电流密度从19.17 mA/cm2提升至27.25 mA/cm2,比探测率从0.78×1012 Jones提升到1.45×1012 Jones。形貌分析证实IEICO-4F优化了PC71BM的相分布,形成更精细的互穿网络结构,促进电荷转移并降低串联电阻,研究同时发现过量掺杂会破坏相分离平衡,影响载流子分离和流入,导致电子-空穴的传输不平衡。该工作揭示了非富勒烯受体掺杂对传统聚合物——富勒烯体系的多重调控作用。研究发现通过光谱拓宽与形貌优化的协同机制可有效提升器件光电性能,为有机光电探测材料体系的设计提供了新思路。 展开更多
关键词 平面异质结 有机光电探测器 吸收光谱 电荷转移
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A New Oviraptorid Dinosaur (Theropoda: Oviraptorosauria) from the Late Cretaceous of Jiangxi Province, Southern China 认领 引用 被引量：8
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作者 WEI Xuefang PU Hanyong +2 位作者 XU Li LIU Di Lü Junchang 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2013年第4期899-904,共6页
A new oviraptorid dinosaur Jiangxisaurus ganzhouensis gen. et sp. nov., is erected based on a partial skeleton from the Upper Cretaceous Nanxiong Formation of Ganzhou City, Jiangxi Province. The new taxon differs from... A new oviraptorid dinosaur Jiangxisaurus ganzhouensis gen. et sp. nov., is erected based on a partial skeleton from the Upper Cretaceous Nanxiong Formation of Ganzhou City, Jiangxi Province. The new taxon differs from other oviraptorids in the weakly downturned rostrum of the lower jaw, much-elongated mandible with a height-to-length ratio being about 20% and the length ratio of radius to humerus of about 0.70. This species not only adds a new member to oviraptorid dinosaurs, but also provides more information about oviraptorid paleogeographical distribution in southern China. 展开更多
关键词 Oviraptoridae Jiangxisaurus Nanxiong Formation Upper Cretaceous Ganzhou Basin,Jiangxi Province
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Observation and modeling of vertical carbon dioxide distribution in a heavily polluted suburban environment 认领 引用 被引量：6
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作者 BAO Zhongxiu HAN Pengfei +6 位作者 ZENG Ning LIU Di CAI Qixiang WANG Yinghong TANG Guiqian ZHENG Ke YAO Bo 《Atmospheric and Oceanic Science Letters》 CSCD 2020年第4期371-379,共9页
The vertical distribution of carbon dioxide(CO2)is important for the calibration and validation of transport models and remote sensing measurements.Due to the large mass and volume of traditional instruments as well a... The vertical distribution of carbon dioxide(CO2)is important for the calibration and validation of transport models and remote sensing measurements.Due to the large mass and volume of traditional instruments as well as supporting systems,in-situ measurements of the CO2 vertical profile within the boundary layer are rare.This study used a miniaturized CO2 monitoring instrument based on a low-cost non-dispersive infrared(NDIR)sensor to measure the CO2 vertical profile and meteorological parameters of the lower troposphere(0–1000 m)in southwestern Shijiazhuang,Hebei Province,China.The sensors were onboard a tethered balloon with two processes:the ascending process and the descending process.The results showed that the overall trend of CO2 concentration decreased with height.Weather conditions and CO2 emission sources caused fluctuations in CO2 concentrations.The CO2 concentration varied from morning to afternoon due mainly to the faster spread of air mass during daytime,with strong convections and the accumulation of emissions at night.The low-cost sensor produced results consistent with the traditional gas chromatography method.The Weather Research and Forecasting model could not capture the CO2 profiles well due mainly to the bad performances in boundary layer height and the potential outdated fossil fuel emissions around the experimental site.This experiment is the first successful attempt to observe the CO2 vertical distribution in the lower troposphere by using lowcost NDIR sensors.The results help us to understand the vertical structure of CO2 in the boundary layer,and provide data for calibrating and validating transport models. 展开更多
关键词 Low cost sensor co2 vertical profile tethered balloon meteorological conditions non-dispersive infrared(NDIR)
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