检索结果-南通市图书馆

Automatic segmentation algorithm for high-spatial-resolution remote sensing images based on self-learning super-pixel convolutional network

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2022年第1期15卷 1101-1124页

作者： Zenan Yang Haipeng Niu Liang Huang Xiaoxuan Wang liangxin Fan Dongyang Xiao School of Surveying and Land Information Engineering Henan Polytechnic UniversityJiaozuoHenanPeople’s Republic of China Research Centre of Arable Land Protection and Urban-rural High-quality Development of of Yellow River Basin HenanPeople’s Republic of China Faculty of Land Resources Engineering Kunming University of Science and TechnologyKunmingPeople’s Republic of China Surveying and Mapping Geo-Informatics Technology Research Center on Plateau Mountains of Yunnan Higher Education KunmingPeople’s Republic of China Key Laboratory of Spatio-temporal Information and Ecological Restoration of Mines of Natural Resources of the People's Republic of China Henan Polytechnic UniversityJiaozuoPeople’s Republic of China

Super-pixel algorithms based on convolutional neural networks with fuzzy C-means clustering are widely used for high-spatial-resolution remote sensing images ***,this model requires the number of clusters to be set manually,resulting in a low automation degree due to the complexity of the iterative clustering *** address this problem,a segmentation method based on a self-learning super-pixel network(SLSP-Net)and modified automatic fuzzy clustering(MAFC)is ***-Net performs feature extraction,non-iterative clustering,and gradient reconstruction.A lightweight feature embedder is adopted for feature extraction,thus expanding the receiving range and generating multi-scale *** matching is used for non-iterative clustering,and the overfitting of the network model is overcome by adaptively adjusting the gradient weight parameters,providing a better irregular super-pixel neighborhood *** optimized density peak algorithm is adopted for *** on the obtained super-pixel image,this maximizes the robust decision-making interval,which enhances the automation of regional ***,prior entropy fuzzy C-means clustering is applied to optimize the robust decision-making and obtain the final segmentation *** results show that the proposed model offers reduced experimental complexity and achieves good performance,realizing not only automatic image segmentation,but also good segmentation results.

关键词： Deep convolution neural network model super-pixel algorithm automatic fuzzy clustering prior entropy fuzzy C-Means clustering algorithm remote sensing images

Interactions between soil conservation and dryland farming of heterogeneously eroding areas in Loess Hills,China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Soil and Water Conservation Research 2022年第4期10卷 574-585页

作者： Boyang Sui Xiaohu Dang liangxin Fan Bo Guo Wei Bi Guobin Liu College of Geology and Environment Xi'an University of Science and TechnologyXi'an710054China College of Geomatics and Land Information Engineering Henan Polytechnic UniversityJiaozuo454000China College of Geomatics Xi'an University of Science and TechnologyXi'an710054China Institute of Soil and Water Conservation Chinese Academy of Science and Ministry of Water ResourcesYangling712100China

The unidirectional impacts of soil conservation on dryland farming and local livelihood have been well ***,there are gaps in literature regarding the interactions among factors,such as labor force and financial capital,in response to soil conservation,as well as the influence of such interactions on the relationships between environmental projects and agricultural *** combining the Chinese Soil Loss Equation(CSLE)model and statistical analyses,this study investigated the spatiotemporal characteristics of soil erosion while also identifying the controlling factors that affect crop and livestock *** aim was to reveal how these factors interacted to influence agriculture in two case study areas between 2.00 and *** results showed that soil erosion substantially declined as a consequence of soil conservation,while the output from crop farming increased,indicating that there was a synergy between soil conservation and dryland farming in both the districts,over time;and factors facilitating crop farming,such as labor force,agricultural machinery,and irrigation,appeared to exert an adverse effect on livestock farming in both areas,implying a tradeoff between livestock and crop farming in the context of programs such as the Grain for Green Program(GGP)in the Loess *** a tradeoff is a result of the competition for cropland and labor that exists due to grazing prohibition and rural-urban ***,policy-related resolutions are required to address the land use conflicts and migration-related rural labor losing due to implementation of the GGP in the Loess Hills.

关键词： Heterogeneous erosion environment Soil conservation Dryland farming Tradeoff/synergy of conservation and agriculture Loess hills

Effects of the incorporation amounts of CdS and Cd(SCN_(2.H_(4))_(2.Cl_(2.on the performance of perovskite solar cells

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2022年第2期29卷 283-291页

作者： Jihong Zheng liangxin Zhu Zhitao Shen Fumin Li Lanyu Ling Huilin Li Chong Chen Henan Key Laboratory of Photovoltaic Materials Henan UniversityKaifeng 475004China School of Physics and Electronics Henan UniversityKaifeng 475004China

An excellent organolead halide perovskite film is important for the good performance of perovskite solar cells(PSCs).However,defects in perovskite crystals can affect the photovoltaic properties and stability of solar *** solve this problem,this study incorporated a complex of Cd S and Cd(SCN_(2.H_(4))_(2.Cl_(2.into the CH_(3)NH_(3)Pb I_(3)active *** effects of different doping concentrations of Cd S and Cd(SCN_(2.H_(4))_(2.Cl_(2.on the performance and stability of PSCs were *** showed that doping appropriate incorporation concentrations of Cd S and Cd(SCN_(2.H_(4))_(2.Cl_(2.in CH_(3)NH_(3)Pb I_(3)can improve the performance of the prepared solar *** specific,Cd S and Cd(SCN_(2.H_(4))_(2.Cl_(2.can effectively passivate the defects in perovskite crystals,thereby suppressing the charge recombination in PSCs and promoting the charge extraction at the TiO_(2./perovskite *** to the reduction of perovskite crystal defects and the enhancement of compactness of the Cd S:Cd(SCN_(2.H4)_(2.Cl_(2.:CH_(3)NH_(3)Pb I_(3)composite film,the stability of PSCs is significantly improved.

关键词： perovskite solar cells charge extraction defect passivation incorporation concentration

在线全文

学校读者我要写书评

暂无评论

铁死亡在子宫内膜癌中的研究现状

中国医药科学 2024年第16期14卷 26-29页

作者：潘瑶任亮欣杭晓朦李丰玲滨州医学院烟台附属医院妇科山东烟台264100

肿瘤发生的标志是成功地规避细胞死亡调控,实现无限复制和不朽。铁死亡是一种新型的非凋亡细胞死亡模式,其主要以铁依赖性的脂质过氧化和脂质活性氧(ROS)堆积为特征。在形态学、生理学和生物化学方面不同于传统的程序性细胞死亡。多项... 详细信息

肿瘤发生的标志是成功地规避细胞死亡调控,实现无限复制和不朽。铁死亡是一种新型的非凋亡细胞死亡模式,其主要以铁依赖性的脂质过氧化和脂质活性氧(ROS)堆积为特征。在形态学、生理学和生物化学方面不同于传统的程序性细胞死亡。多项研究已表明铁死亡与许多疾病的病理生理过程密切相关,如癌症、神经退行性变、组织损伤、炎症。并在女性生殖系统中发挥独特的作用。大量研究表明,铁死亡在肿瘤抑制中起着关键作用,从而为癌症治疗提供了新的机会。然而,关于子宫内膜癌(EC)中铁死亡的报道较少。本文针对铁死亡在EC中的发生发展及预后进行综述。

关键词：铁死亡子宫内膜癌活性氧代谢

赣南石头坪重稀土矿床赋矿母岩地质特征及成矿意义探讨

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

东华理工大学学报（自然科学版） 2024年第4期47卷 338-348页

作者：张德富曹明轩龚兴龚良信钟文邱文江王先广江西应用技术职业学院自然资源部离子型稀土与环境重点实验室江西赣州341000 东华理工大学地球科学学院江西南昌330013 合肥工业大学资源与环境工程学院安徽合肥230009 江西省地质调查勘查院基础地质调查所江西南昌330013 江西有色地质矿产勘查开发院江西南昌330013 江西省矿产资源保障服务中心江西南昌330025

赣南石头坪离子吸附型重稀土矿床是近期新发现的超大型矿床,由于缺乏精确的赋矿母岩矿物学、年代学和地球化学研究,目前该矿床成因机理尚不清楚。对该矿床赋矿母岩开展岩相学、地球化学、锆石U-Pb年代学、锆石Lu-Hf同位素分析,结果表明... 详细信息

赣南石头坪离子吸附型重稀土矿床是近期新发现的超大型矿床,由于缺乏精确的赋矿母岩矿物学、年代学和地球化学研究,目前该矿床成因机理尚不清楚。对该矿床赋矿母岩开展岩相学、地球化学、锆石U-Pb年代学、锆石Lu-Hf同位素分析,结果表明,赋矿母岩具有较高的SiO_(2.(76.11%~77.96%)和全碱(K_(2.O+Na_(2.O)(7.18%~7.86%)含量及较低的P_(2.O_(5)含量(0.01%~0.02.),其Zr/Hf(18.73~2..97)、Nb/Ta(5.2.~11.10)和K/Rb(52.2.~57.2.)值相对较低,属于高分异I型花岗岩和富钇轻稀土型花岗岩(LREE/HREE=1.05~1.90,Y/REE=2..5%~32.0%)。赋矿花岗岩形成于早白垩世早期((145.7±4.5) Ma),具有明显高于区域古老地壳基底的锆石Hf同位素组成(ε_(Hf)(t)=-0.2.~+2.01),表明岩浆源区明显存在新生陆壳物质的加入,与区域古太平洋板块俯冲后撤引起的伸展环境有关。赋矿花岗岩中存在大量与萤石共生的热液成因的氟碳酸盐类稀土矿物,风化过程中易于分解,为离子吸附型重稀土矿床提供了主要的成矿物质来源。石头坪重稀土矿床的发现,表明华南地区燕山晚期富钇轻稀土型花岗岩在风化作用下能形成重稀土矿床。

关键词：岩石成因离子吸附型重稀土矿床赣南石头坪

血脂及脂代谢基因协同相关代谢途径在子宫内膜癌中的研究进展

在线全文

学校读者我要写书评

暂无评论

中国医药科学 2024年第15期14卷 36-39,73页

作者：杨雅琴初萍李丰玲任亮欣滨州医学院烟台附属医院妇科山东烟台264100

子宫内膜癌是世界上第六大常见的癌症,也是我国最常见的妇科恶性肿瘤,大多数子宫内膜癌患者在疾病的早期能够被确诊,并且具有良好的5年生存率,但仍有约30%的患者在确诊时已是晚期。目前子宫内膜癌的治疗方法多侧重于手术及放化疗,但这... 详细信息

子宫内膜癌是世界上第六大常见的癌症,也是我国最常见的妇科恶性肿瘤,大多数子宫内膜癌患者在疾病的早期能够被确诊,并且具有良好的5年生存率,但仍有约30%的患者在确诊时已是晚期。目前子宫内膜癌的治疗方法多侧重于手术及放化疗,但这些治疗对于晚期患者而言疗效不佳,导致其5年生存率仅为30%~40%,改善子宫内膜癌患者的晚期预后是亟待解决的问题。随着代谢组学逐渐受到关注,有证据证明脂质代谢异常是癌症当中比较活跃的代谢变化,近年来国内外的专家研究发现血脂代谢途径在恶性肿瘤疾病的预后中存在重要作用。本文主要探讨血脂及脂代谢相关基因及途径对子宫内膜癌患者的预后影响,以此为子宫内膜癌预后治疗靶点提供新思路,以更深入开发有效的疾病预防措施和更好的治疗药物,降低子宫内膜癌的发病率以及提高子宫内膜癌患者无病生存率。

关键词：子宫内膜癌脂代谢途径血脂他汀类药物

维普期刊数据库博看期刊

Measurement of Ammonia Emission Following Surface Application of Urea Fertilizer from Irrigated Paddy Rice Fields

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2005年第4期4卷 288-293页

作者： Md.ToufiqIqbal TIANGuang-ming liangxin-qiang FatimaRukshana DepartmentofAgronomyandAgriculturalExtension UniversityofRajshahiRajshahi-6205Bangladesh DepartmentofAgriculturalEnvironmentProtection ZhejiangUniversityHangzhou310029P.R.China RiverResearchInstitute FaridpurBangladesh

Ammonia emission is one of the most important pathways of nitrogen loss from agricultural cultivated field. In this paper, we report the measurement of ammonia emission from paddy rice field obtained by surface application of urea fertilizer with water management. The main objective of the present study were to assess the amount of NH3 emission and the loss of nitrogen from paddy field as affected by various N doses, i.e., 0 (control), 90 (N1), 180 (N2., 2.0 (N3) and 360 (N4) kg ha-1, following field surface application of urea fertilizer with water management. Ammonia emissions were measured by continuous airflow enclosure method from plots fertilized with the application of surface urea. Increase in urea-N dosage increased NH3 emission that was measured from paddy rice field. Ammonia emission started immediately and was almost complete within 12.days after top dressing of urea application to the soils. Ammonia emissions were nearly constant in all treatments from 12.days after fertilizer application. Highest ammonia emission rate was 2. g /day and total amount of ammonia emission was 56.2. kg ha-1 for 360 kg N ha-1 dose. No remarkable observation was found about temperature for ammonia emission. Due to proper water management practices less emission was observed throughout the experiment period. The results also show that N loss through NH3 emission accounted for 11 to 16% during the rice- growing season. These magnitudes of loss of N appear to be most important for environmental point of view.

关键词： Ammonia emission Surface application Urea Paddy field Nitrogen loss

赣南碛肚山岩体年代学、地球化学特征及地质意义

在线全文

学校读者我要写书评

暂无评论

地质与勘探 2024年第5期60卷 955-970页

作者：龚良信张健仁张德富王先广吕婷婷钟文张永文孟繁敏唐梅华江西省地质调查勘查院基础地质调查所江西南昌330013 江西有色地质矿产勘查开发院江西南昌330013 江西应用技术职业学院江西赣州341000 东华理工大学地球科学学院江西南昌330013 江西省矿产资源保障服务中心江西南昌330013 赣州市综合检验检测院江西赣州341000

赣南碛肚山岩体作为石头坪重稀土矿床的成矿母岩,目前对其侵位时代、岩石成因、岩石类型、构造环境的认识不足。本文对碛肚山岩体黑云母正长花岗岩开展锆石、独居石U-Pb定年,元素地球化学及Sr-Nd同位素研究。结果表明:碛肚山岩体黑云母... 详细信息

赣南碛肚山岩体作为石头坪重稀土矿床的成矿母岩,目前对其侵位时代、岩石成因、岩石类型、构造环境的认识不足。本文对碛肚山岩体黑云母正长花岗岩开展锆石、独居石U-Pb定年,元素地球化学及Sr-Nd同位素研究。结果表明:碛肚山岩体黑云母正长花岗岩锆石、独居石U-Pb年龄分别为145.0±2.3 Ma、147±1.7 Ma,属早白垩世岩浆活动产物;岩石具有高SiO2.72.78%~77.67%),富钾(K2./Na2.=1.07~1.38),低Al_(2.O_(3)(12.03%~13.18%),过铝质-强过铝质(A/CNK=1.08~1.2.),REE配分模式为海鸥型,富集Rb、U、Th等元素,亏损Sr、Ba、Eu等元素,略高的锆石饱和温度(761~834℃),显示过铝质A型花岗岩特点。同时岩石具有高Rb含量(2.7.6×10^(-6)~901.3×10^(-6)),Rb/Sr比值(8.07~195.93),显示高分异花岗岩特点。综上认为碛肚山岩体为高分异过铝质A型花岗岩。εNd(t)变化范围为-4.1~-3.0(>-7.0),符合地幔物质参与成岩过程,但在成岩过程中主要提供热量,物质贡献较少。根据区域地质和构造图解,认为碛肚山岩体侵入与古太平洋板块俯冲后撤致使岩石圈伸展有关。

关键词： A型花岗岩 U-Pb测年 Sr-Nd同位素重稀土碛肚山岩体赣南

在线全文

学校读者我要写书评

暂无评论

近60年来广东春季低温阴雨的时空变化特征

广东气象 2024年第5期46卷 6-10页

作者：丁丽佳凌良新陈新煜杨婕俐陆百翔潮州市气象局广东潮州521011 潮州市突发事件预警信息发布中心广东潮州521011

利用广东74个国家气象观测站1964—2.2.年2.4月逐日平均气温资料、日照时数资料,采用线性倾向估计、M-K突变检验、小波分析等方法,对近60年来低温阴雨天气的时空变化特征进行分析。结果表明:广东低温阴雨平均总日数、各等级低温阴雨日... 详细信息

利用广东74个国家气象观测站1964—2.2.年2.4月逐日平均气温资料、日照时数资料,采用线性倾向估计、M-K突变检验、小波分析等方法,对近60年来低温阴雨天气的时空变化特征进行分析。结果表明:广东低温阴雨平均总日数、各等级低温阴雨日数呈西北多南部少的分布特征;北部低温阴雨结束时间迟。广东低温阴雨日数呈减少趋势,年际、年代际波动明显;低温阴雨总日数、重度日数减少及终日提前趋势显著;低温阴雨轻度日数、中度日数下降趋势不显著。区域低温阴雨的总日数、重度日数呈减少趋势;终日呈提前趋势,轻度和中度日数变化趋势不显著。低温阴雨总日数和轻度、重度日数存在准2.年的显著周期震荡;中度低温阴雨日数具有准14年的显著周期震荡;终日具有准2.年的显著周期震荡。广东低温阴雨总日数、轻度日数及终日在2.17年前后发生日数减少和终日提前的突变;低温阴雨重度日数在2.02.发生日数减少的突变;低温阴雨中度日数没有突变发生。

关键词：气候学低温阴雨时空分布春季广东