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Low soil C:N ratio results in accumulation and leaching of nitrite and nitrate in agricultural soils under heavy rainfall

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Pedosphere 2023年第6期33卷 865-879页

作者： Xiaosong YANG Zhengyi HU zijian xie Songyan LI Xiaolei SUN Xianlin KE Mingming TAO Resource and Environmental College University of Chinese Academy of SciencesBeijing 100049China Sino-Danish College University of Chinese Academy of SciencesBeijing 100049China National Engineering Laboratory for Lake Pollution Control and Ecological Restoration Chinese Research Academy of Environmental SciencesBeijing 100012China Institute of Bio-and Geosciences Agrosphere(IBG-3)Forschungszentrum JulichJulich 52425Germany

Nitrate (NO-3) and nitrite (NO2-) leaching threatens groundwater *** C:N ratio,i.e.,the ratio of soil organic carbon to total nitrogen,affects mineralization,nitrification,and denitrification;however,its mechanism for driving soil NO-3and NO-2accumulation and leaching remains ***,a field investigation in a fluvo-aquic soil and a soil column experiment were performed to explore the relationships between soil C:N ratio and soil NO-3and NO-2leaching in three soil layers (0–20,20–40,and 40–60 cm) under heavy rainfall (rainfall rate>25 mm d-1).The field investigation results showed that both soil NO-3-N and NO-2-N contents decreased exponentially (P<0.001) with increasing soil C:N ratio in each soil ***,negative exponential relationships (P<0.001) were found between soil C:N ratio and both NO-3-N and NO-2-N concentrations in soil solution in each soil layer under heavy *** soil column divided into three layers was leached with simulated heavy rainfall;the results confirmed negative exponential relationships (P<0.05) between soil C:N ratio and both NO-3-N and NO-2-N concentrations in the leachate from each soil layer.A total of 18 soil samples obtained from three depths at six field sites during the rainy season were used to elucidate the microbial mechanisms induced by soil C:N ratio using high-throughput sequencing and real-time polymerase chain *** abundances of ammonifying bacteria (Flavobacterium,Bacillu,and Pseudomonas),ammonia-oxidizing bacteria (Nitrosospira),and nirS/K gene were observed when soil C:N was low,concomitant with low abundances of NO-2-oxidizing bacteria (Nitrospira) and narG *** least squares path modeling showed that the high NO-3and NO-2levels at low soil C:N ratio might be attributed to the inhibition of NO-3reduction (i.e.,low narG gene) and NO-2oxidation (i.e.,low Nitrospira) and thus the accumulation of soil NO-3and NO-2,***,the leaching of NO-2and NO-3in low C:N so

关键词： ammonia-oxidizing bacteria ammonifying bacteria functional gene microbial community nitrite-oxidizing bacteria

Filtering and regret network for spacecraft component segmentation based on gray images and depth maps

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Chinese Journal of Aeronautics 2024年第7期37卷 439-449页

作者： Xiang LIU Hongyuan WANG zijian WANG Xinlong CHEN Weichun CHEN Zhengyou xie Institute of Aeronautics Harbin Institute of TechnologyHarbin 150001China Qian Xuesen Laboratory of Space Technology China Academy of Space TechnologyBeijing 100080China

Identifying and segmenting spacecraft components is vital in many on-orbit space missions,such as on-orbit maintenance and component *** depth maps with visual images has been proven effective in improving segmentation ***,existing methods ignore the noise and fallacy in collected depth maps,which interfere with the network to extract representative features,decreasing the final segmentation *** this end,this paper proposes a Filtering and Regret Network(FRNet)for spacecraft component *** FRNet incorporates filtering and regret mechanisms to suppress the abnormal depth response in shallow layers and selectively reuses the filtered cues in deep layers,avoiding the detrimental effects of low-quality depth information while preserving the semantic context inherent in depth ***,a two-stage feature fusion module is proposed,which involves information interaction and *** module effectively explores the feature correlation and unifies the multimodal features into a comprehensive ***,a large-scale spacecraft component recognition dataset is constructed for training and evaluating spacecraft component segmentation *** results demonstrate that the FRNet achieves a state-of-the-art performance with a mean Intersection Over Union(mIOU)of 84.13%and an average inference time of 133.2 ms when tested on an NVIDIA RTX 2080 SUPER GPU.

关键词： Spacecraft component recognition Multi-modal feature fusion Satellite dataset Intelligent systems Deep learning

DPT‐tracker:Dual pooling transformer for efficient visual tracking

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CAAI Transactions on Intelligence Technology 2024年第4期9卷 948-959页

作者： Yang Fang Bailian xie Uswah Khairuddin zijian Min Bingbing Jiang Weisheng Li Key Laboratory of Data Engineering and Visual Computing Chongqing University of Posts and TelecommunicationsChongqingChina Department of Mechanical Precision Engineering Malaysia‐Japan International Institute of TechnologyUniversity of Technology MalaysiaKuala LumpurMalaysia Department of Electrical and Computer Engineering Inha UniversityIncheonRepublic of Korea School of Information Science and Technology Hangzhou Normal UniversityHangzhouChina

Transformer tracking always takes paired template and search images as encoder input and conduct feature extraction and target‐search feature correlation by self and/or cross attention operations,thus the model complexity will grow quadratically with the number of input *** alleviate the burden of this tracking paradigm and facilitate practical deployment of Transformer‐based trackers,we propose a dual pooling transformer tracking framework,dubbed as DPT,which consists of three components:a simple yet efficient spatiotemporal attention model(SAM),a mutual correlation pooling Trans-former(MCPT)and a multiscale aggregation pooling Transformer(MAPT).SAM is designed to gracefully aggregates temporal dynamics and spatial appearance information of multi‐frame templates along space‐time *** aims to capture multi‐scale pooled and correlated contextual features,which is followed by MAPT that aggregates multi‐scale features into a unified feature representation for tracking *** tracker achieves AUC score of 69.5 on LaSOT and precision score of 82.8 on Track-ingNet while maintaining a shorter sequence length of attention tokens,fewer parameters and FLOPs compared to existing state‐of‐the‐art(SOTA)Transformer tracking *** experiments demonstrate that DPT tracker yields a strong real‐time tracking baseline with a good trade‐off between tracking performance and inference efficiency.

关键词： human‐computer interfacing image motion analysis pattern recognition signal processing tracking

Improvement strategy on thermophysical properties of A_(2)B_(2)O_(7)-type rare earth zirconates for thermal barrier coatings applications:A review

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 1147-1165页

作者： zijian Peng Yuhao Wang Shuqi Wang Junteng Yao Qingyuan Zhao Enyu xie Guoliang Chen Zhigang Wang Zhanguo Liu Yaming Wang Jiahu Ouyang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Materials and Metallurgical Engineering Inner Mongolia University of Science&TechnologyBaotou 014010China

The A_(2)B_(2)O_(7)-type rare earth zirconate compounds have been considered as promising candidates for thermal barrier coating(TBC) materials because of their low sintering rate,improved phase stability,and reduced thermal conductivity in contrast with the currently used yttria-partially stabilized zirconia (YSZ) in high operating temperature *** review summarizes the recent progress on rare earth zirconates for TBCs that insulate high-temperature gas from hot-section components in gas *** on the first principles,molecular dynamics,and new data-driven calculation approaches,doping and high-entropy strategies have now been adopted in advanced TBC materials *** this paper,the solid-state heat transfer mechanism of TBCs is explained from two aspects,including heat conduction over the full operating temperature range and thermal radiation at medium and high *** paper also provides new insights into design considerations of adaptive TBC materials,and the challenges and potential breakthroughs are further highlighted for extreme environmental *** for improving thermophysical performance are proposed in two approaches:defect engineering and material compositing.

关键词： rare earth zirconates thermal barrier coatings defect engineering doping and compositing thermal conductivity thermal expansion

CRISPR-mediated genome editing and human diseases

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Genes & Diseases 2016年第4期3卷 244-251页

作者： Liquan Cai Alfred L.Fisher Haochu Huang zijian xie Marshal l Institute for Interdisciplinary Research(MIIR) Marshall UniversityWeisberg Engineering ComplexMarshall University1628 Third AvenueHuntingtonWV 25703USA University of Texas Health Science Center at San Antonio Department of MedicineDivision of GeriatricsGerontologyand Palliative MedicineSan AntonioTX 78229USA GRECC South Texas VA Healthcare SystemSan AntonioTX 78229USA Committee on Immunology Section of RheumatologyDepartment of MedicineKnapp Center for Lupus and Immunology ResearchUniversity of ChicagoChicagoIL 60637USA

CRISPR(Clustered Regularly Interspaced Short Palindromic Repeats)technology has emerged as a powerful technology for genome editing and is now widely used in basic biomedical research to explore gene *** recently,this technology has been increasingly applied to the study or treatment of human diseases,including Barth syndrome effects on the heart,Duchenne muscular dystrophy,hemophilia,b-Thalassemia,and cystic ***/Cas9(CRISPR-associated protein 9)genome editing has been used to correct diseasecausing DNA mutations ranging from a single base pair to large deletions in model systems ranging from cells in vitro to animals in *** addition to genetic diseases,CRISPR/Cas9 gene editing has also been applied in immunology-focused applications such as the targeting of C-C chemokine receptor type 5,the programmed death 1 gene,or the creation of chimeric antigen receptors in T cells for purposes such as the treatment of the acquired immune deficiency syndrome(AIDS)or promoting anti-tumor ***,this technology has been applied to the genetic manipulation of domesticated animals with the goal of producing biologic medical materials,including molecules,cells or organs,on a large ***,CRISPR/Cas9 has been teamed with induced pluripotent stem(iPS)cells to perform multiple tissue engineering tasks including the creation of disease models or the preparation of donor-specific tissues for *** review will explore the ways in which the use of CRISPR/Cas9 is opening new doors to the treatment of human diseases.

关键词： CRISPR DNA double-stranded break Genome editing Human diseases iPS cells

基于探春人物及其坐具图像研究的现代女性坐具创新设计

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包装工程 2024年第4期45卷 123-130页

作者：徐世博王子健解芳上海应用技术大学上海200235

目的挖掘《红楼梦》探春人物形象与现代女性的共通点,以探春人物坐具图像为研究点,并结合用户分析进行现代女性坐具创新设计。方法首先分析探春人物形象及文化象征;其次广泛收集探春坐具图像并整理挑选出代表性坐具样本,分析归纳图像中... 详细信息

目的挖掘《红楼梦》探春人物形象与现代女性的共通点,以探春人物坐具图像为研究点,并结合用户分析进行现代女性坐具创新设计。方法首先分析探春人物形象及文化象征;其次广泛收集探春坐具图像并整理挑选出代表性坐具样本,分析归纳图像中坐具形制、图像含义、设计理念,再通过创建用户角色模型分析用户审美喜好、消费需求和意向;最后衔接各关键点设计出体现传统美学和探春人物形象的坐具,且符合现代独立女性的使用喜好。结论以探春刚柔并济的人物形象投射现代女性,其相关坐具图像研究和创新适合现代女性用户群体的个性和情感价值需求,为当代设计师提供新的文化灵感,也为现代女性家具设计创新开辟新的思考空间。

关键词：贾探春图像女性坐具设计创新

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茶与心肌病

茶与心肌病

兴凯湖沉积物重金属生态风险评价及污染特征分析

第四届第二次中国毒理学会食品毒理专业委员会学术会议

作者： zijian xie Ph.D. Department of Pharmacology Medical College of Ohio,Toledo OH

Tea,Health and Diseases 茶、健康和疾病 Cancer：Animal studies vs human data 癌症：动物实验 vs 人体资料 Immunology：A new field 免疫学：新领域 Cardiovascular Diseases：Promises and Issues 心血管疾病：前景和问题 Pharmac...

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环境工程技术学报 2023年第6期13卷 1987-1996页

作者：谢自建赵荣博汪洋王昊李春华于宗灵叶春湖泊水污染治理与生态修复技术国家工程实验室中国环境科学研究院国家环境保护湖泊污染控制重点实验室中国环境科学研究院环境与安全工程学院沈阳化工大学黑龙江省生态环境监测中心

兴凯湖是中俄跨国境湖泊,开展兴凯湖沉积物重金属生态风险评价及来源解析,对区域生态环境保护和治理具有重要意义。通过采集兴凯湖中国湖区表层及柱状沉积物样品,测定重金属As、Cd、Cu、Pb、Hg、Ni、Cr和Zn浓度,运用地累积指数法、潜在... 详细信息

兴凯湖是中俄跨国境湖泊,开展兴凯湖沉积物重金属生态风险评价及来源解析,对区域生态环境保护和治理具有重要意义。通过采集兴凯湖中国湖区表层及柱状沉积物样品,测定重金属As、Cd、Cu、Pb、Hg、Ni、Cr和Zn浓度,运用地累积指数法、潜在风险指数法对重金属污染状况和潜在生态风险进行评价,并通过数理统计分析其潜在来源。结果显示:小兴凯湖表层沉积物中Cr、Ni、As、Cr、Hg浓度均值超过黑龙江省土壤背景参考值,大兴凯湖表层沉积物中仅Ni、Cd浓度均值超过黑龙江省土壤背景参考值。地累积指数评价显示小兴凯湖表层沉积物Hg的污染程度较高,主要为轻度污染和偏中度污染,As和Cd以无污染为主、轻度污染次之,大兴凯湖Cd主要为轻度污染,其余重金属主要为无污染。潜在生态风险指数评价显示,兴凯湖表层沉积物总体呈无污染到偏中度污染,Cd为最主要的生态风险因子。As、Hg和Cd是重金属污染的主要因子,受入湖河流上游农业生产活动及矿产开发冶炼的影响,位于小兴凯湖东侧及大兴凯湖西侧区域污染风险相对更高;此外,考虑到大兴凯湖Cd呈底部富集特征,其可能受到自然背景影响。

关键词：沉积物重金属生态风险评价来源解析兴凯湖

土地利用对兴凯湖入湖河流水质影响及生态修复策略

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环境工程技术学报 2023年第6期13卷 1997-2005页

作者：徐宜雪谢自建王昊李春华李季魏伟伟郑烨叶春湖泊水污染治理与生态修复技术国家工程实验室中国环境科学研究院鸡西市生态环境局

兴凯湖是中俄跨境湖泊,其水质变化受到国际社会的高度关注,入湖河流水质状况对兴凯湖水质有着重要影响。以兴凯湖中国境内流域为研究区域,基于内梅罗污染指数法、方差分析、冗余分析、聚类分析等方法,分析兴凯湖入湖河流水质污染特征,... 详细信息

兴凯湖是中俄跨境湖泊,其水质变化受到国际社会的高度关注,入湖河流水质状况对兴凯湖水质有着重要影响。以兴凯湖中国境内流域为研究区域,基于内梅罗污染指数法、方差分析、冗余分析、聚类分析等方法,分析兴凯湖入湖河流水质污染特征,探究流域土地利用结构对河流水质的影响,并据此提出入湖河流分类修复策略。结果表明:兴凯湖入湖河流水质为GB3838—2002《地表水环境质量标准》Ⅲ类~劣Ⅴ类,化学需氧量、总磷、高锰酸盐指数是主要超标因子;兴凯湖入湖河流丰水期水质整体优于平水期,大兴凯湖入湖河流水质整体优于小兴凯湖;兴凯湖流域土地利用对入湖河流水质的解释度在丰水期和平水期分别为52.31%和45.38%,耕地对河流水质产生负面影响,林地、水体对入湖河流水质起改善作用,而人造地表、草地在不同水期对入湖河流水质的影响不同。基于入湖河流水质、流域土地利用结构的聚类分析,将兴凯湖入湖河流分为生态保育型、生态修复型和综合治理型3种类型,并提出了具有针对性的治理与修复策略。

关键词：兴凯湖入湖河流水质土地利用生态修复