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Mutual influence of copper and paraquat on their adsorption in soil

Pedosphere 2023年第6期33卷 857-864页

作者： huanhua wang Zhiguo PEI Guangcai CHEN Baoshan XING National Engineering Laboratory for Lake Pollution Control and Ecological Restoration Chinese Research Academy of Environmental SciencesBeijing 100012China State Environmental Protection Key Laboratory for Lake Pollution Control Chinese Research Academy of Environmental SciencesBeijing 100012China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Research Institute of Subtropical Forestry Chinese Academy of ForestryHangzhou 311400China Stockbridge School of Agriculture University of MassachusettsAmherst MA 01003USA

Paraquat and copper (Cu) are commonly used and detected in ***,it is important to understand their mobility in the *** this study,the competitive effects of paraquat and Cu on their adsorption in five representative Chinese soils were investigated using batch adsorption equilibrium experiments and spectroscopic *** results showed that the adsorption of paraquat in soil varied with soil type and was positively correlated with both soil cation exchange capacity and organic matter *** exerted a more remarkable suppression effect on the adsorption of Cu than Cu on the adsorption of *** the presence of 0.12 and 0.19 mmol L-1paraquat,Cu adsorption decreased by 16%and 22%in Heilongjiang soil and by 24%and37%in Jiangxi soil,*** the presence of 0.1 and 0.2 mmol L-1Cu,paraquat adsorption decreased by 4%and 8%in Heilongjiang soil and by15%and 19%in Jiangxi soil,*** selectivity involving symmetric cation (paraquat2+and Cu2+) exchange is the probable basis for the suppression *** ultraviolet-visible absorption experiments suggested that the formation of Cu-paraquat complexes was unlikely to happen in a solution or at the soil *** K-edge X-ray absorption spectroscopy indicated that Cu in soil may have some water as hydration layers as the nearest neighbors,and each Cu atom was coordinated with five oxygen *** findings greatly improve our knowledge of the molecular-scale adsorption mechanisms of paraquat and Cu in soil and can be used to predict the behavior,transport,and fate of paraquat and Cu in agricultural soils.

关键词： cation exchange capacity competitive adsorption heavy metal herbicide organic contaminant soilorganic matter ultraviolet-visible absorption spectrophotometry X-ray absorption spectroscopy

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Growth and morphological characterization of zinc nanoplates

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Science China(Technological Sciences) 2012年第9期55卷 2646-2650页

作者： LUO XiYuan TAN GuoTai YUAN MengYao wang huanhua ZHENG JinCheng JIA QuanJie JIANG XiaoMing College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Department of Physics Xiamen UniversityXiamen 361005China

Zinc nanoplates were grown using thermal evaporation without catalyst or template *** electron microscopy and selected area electron diffraction analyses showed that the plates were single crystals with either {0001} or {11 20} as basal *** morphological characteristics were explained in terms of the intrinsic growth anisotropy of zinc,the surface energy of the nano-crystals,the size of the critical nucleus and the migration of the *** results suggested a promising low-cost route for synthesis of pure zinc nanoplates which could be used as precursor for further preparing core-shell nanoplate structures.

关键词： nanoplate zinc thermal evaporation anisotropic growth

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Different mechanisms of improving CH_(3)NH_(3)PbI_(3) perovskite solar cells brought by fluorinated or nitrogen doped graphdiyne

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Nano Research 2022年第1期15卷 573-580页

作者： Huan Huang Bing Liu Dan wang Rongli Cui Xihong Guo Ying Li Shouwei Zuo Zi Yin huanhua wang Jing Zhang Hui Yuan Lirong Zheng Baoyun Sun CAS Key Lab for Biomedical Effects of Nanomaterials&Nanosafety Institute of High Energy PhysicsChinese Academy of ScienceBeijing 100049China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Fluorinated and nitrogen-doped graphdiyne(F/N-GDY)have been used in the active layer of perovskite solar cells(PSCs)for the first *** introduction of heteroatoms turns out to be an effective method for boosted solar cells performance,which increases by 32.8%and 33.0%,better than the pristine or GDY doped *** enhanced performance can be attributed firstly to the superiority of F/N-GDY originated from the unique structure and optoelectronic properties of ***,both can further reduce surface defects and improve surface and bulk crystallinity than pristine ***'s more,efficiency increase caused by F-GDY is mainly attributed to the improvement of fill factor(FF),while the higher short-circuit current(Jsc)plays more important role by N-GDY *** importantly,the detailed mechanism brought about by doping of F-GDY or N-GDY is expounded by systematical characterizations,especially the synchrotron radiation *** of F-GDY causes Pb and forms new Pb-F bonds between F-GDY and Pb *** of N-GDY or GDY brings about Pb(N-GDY doping induces more deviation than that of GDY due to the participation of imine N),improving its electron density and conductivity.

关键词： perovskite solar cells graphdiyne grazing incidence X-ray diffraction(GIXRD) X-ray absorption fine structure(XAFS) synchrotron radiation technique

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A Degradation Type Adaptive and Deep CNN-Based Image Classification Model for Degraded Images

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工程与科学中的计算机建模(英文) 2024年第1期138卷 459-472页

作者： huanhua Liu Wei wang Hanyu Liu Shuheng Yi Yonghao Yu Xunwen Yao School of Information Technology and Management Hunan University of Finance and EconomicsChangsha410205China

Deep Convolutional Neural Networks(CNNs)have achieved high accuracy in image classification tasks,however,most existing models are trained on high-quality images that are not subject to image *** practice,images are often affected by various types of degradation which can significantly impact the performance of *** this work,we investigate the influence of image degradation on three typical image classification CNNs and propose a Degradation Type Adaptive Image Classification Model(DTA-ICM)to improve the existing CNNs’classification accuracy on degraded *** proposed DTA-ICM comprises two key components:a Degradation Type Predictor(DTP)and a Degradation Type Specified Image Classifier(DTS-IC)set,which is trained on existing CNNs for specified types of *** DTP predicts the degradation type of a test image,and the corresponding DTS-IC is then selected to classify the *** evaluate the performance of both the proposed DTP and the DTA-ICMon the Caltech 101 *** experimental results demonstrate that the proposed DTP achieves an average accuracy of 99.70%.Moreover,the proposed DTA-ICM,based on AlexNet,VGG19,and ResNet152,exhibits an average accuracy improvement of 20.63%,18.22%,and 12.9%,respectively,compared with the original CNNs in classifying degraded *** suggests that the proposed DTA-ICM can effectively improve the classification performance of existing CNNs on degraded images,which has important practical implications.

关键词： Image recognition image degradation machine learning deep convolutional neural network

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Anomalous strain effect in heteroepitaxial SrRuO_(3) films on(111) SrTiO_(3) substrates

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Chinese Physics B 2022年第12期31卷 412-416页

作者： Zhenzhen wang Weiheng Qi Jiachang Bi Xinyan Li Yu Chen Fang Yang Yanwei Cao Lin Gu Qinghua Zhang huanhua wang Jiandi Zhang Jiandong Guo Xiaoran Liu Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Songshan Lake Materials Laboratory Dongguan 523808China

We report comprehensive investigations into the structure of high-quality(111)-oriented SrRuO_(3)films on SrTiO_(3)substrates to elucidate the effect of(111)heteroepitaxial *** found that SrRuO_(3)film with a thickness of~40 nm is compressively strained in plane on the substrate with full ***,the out-of-plane spacing is almost the same as in the bulk,which is at odds with the conventional *** probing a series of half-order Bragg reflections using synchrotron-based x-ray diffraction combined with analyses of the scanning transmission electron microscopy images,we discovered that the heteroepitaxial strain is accommodated via significant suppression of the degree of c+octahedral tilting and the formation of three equivalent domain structures on the(111)SrTiO_(3)*** anomalous effect sheds light on the understanding of an unconventional paradigm of film-substrate coupling for the(111)heteroepitaxial strain.

关键词： perovskite SrRuO_(3) (111)-oriented thin films heteroepitaxial strain octahedral tilt and rotation

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南京市不同功能城区表土微生物碳氮与酶活性分析

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生态学杂志 2005年第3期24卷 273-277页

作者：王焕华李恋卿潘根兴吴新民南京农业大学农业资源与生态环境研究所南京210095 池州师范专科学校池州247100

城市土壤环境污染及其对城市环境质量与社会生活的影响 ,已引起公众重视 ,但对其生境问题了解不够。将南京城市土壤划分为 6种功能区 (工业区、交通商业区 )、老居民区、新开发区、城市广场和风景区 ,分析了各功能区土壤的微生物量碳、... 详细信息

城市土壤环境污染及其对城市环境质量与社会生活的影响 ,已引起公众重视 ,但对其生境问题了解不够。将南京城市土壤划分为 6种功能区 (工业区、交通商业区 )、老居民区、新开发区、城市广场和风景区 ,分析了各功能区土壤的微生物量碳、氮及脲酶和过氧化氢酶活性 ,探讨其对城市土壤环境质量的指示意义。结果表明 ,微生物量以公共绿地、风景区较高 ,以新开发区和交通商业区为最低。主成分分析表明 ,脲酶活性、微生物量碳、过氧化氢酶活性对公因子的贡献最大。与自然土壤相比 ,南京城市土壤碳氮比、Cmic/Corg变化范围均增大 ,表明土壤微生物区系受到人为活动较大的干扰。

关键词：城市土壤城市功能区微生物量土壤酶活性环境质量指示

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同步辐射反射法测定液体结构方法研究

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核技术 2007年第7期30卷 560-564页

作者：房春晖房艳贾全杰王焕华姜晓明王玉柱陈雨林联君秦绪峰中国科学院盐湖研究所中国科学院高能物理研究所

用北京同步辐射装置4W1C光束线Huber五圆测角仪反射法测定液体结构的实验方法。以Na2SO4溶液的散射实验为例,简单介绍了样品池构造、散射几何布局、样品准直、扫描条件和扫描方式;详尽叙述了实验散射强度数据的校正方法,如样品池窗口净... 详细信息

用北京同步辐射装置4W1C光束线Huber五圆测角仪反射法测定液体结构的实验方法。以Na2SO4溶液的散射实验为例,简单介绍了样品池构造、散射几何布局、样品准直、扫描条件和扫描方式;详尽叙述了实验散射强度数据的校正方法,如样品池窗口净吸收、空气散射、偏振校正、吸收校正和几何校正等;演示了溶液结构函数和径向分布函数的计算方法,包括Compton散射强度和乱真峰的扣除技巧。研究表明,用同步辐射反射法获得了高质量的X射线散射数据。

关键词：同步辐射反射法 X射线散射硫酸钠液体结构

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铜绿微囊藻培养过程中氨基酸的释放特征及其对水体有机质的贡献

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环境科学研究 2016年第3期29卷 360-367页

作者：于茜朱元荣王焕华汤智宫蓓蓓谭伟强青岛理工大学环境与市政工程学院山东青岛266033 中国环境科学研究院环境基准与风险评估国家重点实验室北京100012 淄博市环境保护局淄川分局山东淄博255100

为深入分析铜绿微囊藻水华暴发对水体有机质、氨基酸含量及组成的影响,进一步揭示蓝藻水华暴发对湖泊内源氨基酸和有机质的贡献及养分循环机制,采集太湖北部富营养化区域梅梁湾中的水样,用于在室内培养太湖蓝藻水华优势种——铜绿微囊藻... 详细信息

为深入分析铜绿微囊藻水华暴发对水体有机质、氨基酸含量及组成的影响,进一步揭示蓝藻水华暴发对湖泊内源氨基酸和有机质的贡献及养分循环机制,采集太湖北部富营养化区域梅梁湾中的水样,用于在室内培养太湖蓝藻水华优势种——铜绿微囊藻（Microcystis aeruginosa）,采用邻苯二甲醛（OPA）柱前衍生-反相高效液相色谱法（HPLC）分析铜绿微囊藻生长、衰亡过程中氨基酸的摩尔浓度及其组成特征的变化,探讨藻类产生的氨基酸和有机质对湖泊水体中有机质、TC（总碳）及DTN（溶解性总氮）的贡献.结果表明：铜绿微囊藻在生长过程中产生的氨基酸对水体中TC、DTN、TOC（总有机碳）的贡献率分别为23%～37%、46%～93%和46%～83%;在衰亡期,水体中难降解氨基酸（如甘氨酸、丝氨酸、丙氨酸和赖氨酸）的摩尔浓度（c）为60.4μmol/L,显著高于同时期易降解氨基酸（如酪氨酸、苯丙氨酸、谷氨酸和精氨酸）的摩尔浓度（40.9μmol/L）;c（D-氨基酸）/c（L-氨基酸）由初始的0.28降至0.09,表明在铜绿微囊藻对数生长至衰亡期间,水体中有机质的降解程度逐渐降低.研究显示,在水体有机质降解程度降低的同时,氨基酸摩尔浓度逐步增加,因此大量未降解的氨基酸沉积下来成为水体有机质来源之一.

关键词：有机质铜绿微囊藻氨基酸富营养化太湖北部

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磁控溅射偏压对Cr薄膜密度以及表面形貌的影响

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电镀与精饰 2016年第7期38卷 1-3,8页

作者：孙钢杰伊福廷王焕华贾全杰张天冲中国科学院高能物理研究所多学科中心北京100049

利用磁控溅射技术,在不同偏压条件下在Si(001)基底上沉积了金属Cr薄膜样品。用同步辐射装置对样品进行了X-射线反射率测试,采用X-射线反射率分析法研究了不同偏压下Cr薄膜密度的变化。发现当偏压小于300 V时,偏压对所沉积的薄膜起到紧... 详细信息

利用磁控溅射技术,在不同偏压条件下在Si(001)基底上沉积了金属Cr薄膜样品。用同步辐射装置对样品进行了X-射线反射率测试,采用X-射线反射率分析法研究了不同偏压下Cr薄膜密度的变化。发现当偏压小于300 V时,偏压对所沉积的薄膜起到紧致的效果,偏压为300 V时薄膜密度最大;当偏压大于300 V时,薄膜密度减小。另外,为了探究偏压对薄膜表面形貌的影响,用扫描电子显微镜对各样品进行了表面分析,发现在偏压较小时薄膜表面较为平整;随着偏压增大,表面呈现界面分明的岛状分布。

关键词： X-射线反射率分析铬薄膜密度表面形貌磁控溅射偏压

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半精纺生产车间的设计改造及设备配置探讨

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现代纺织技术 2007年第5期15卷 19-20,30页

作者：周卫忠王焕华桐乡易德纺织有限公司浙江桐乡314512 桐乡市万新毛纺原料有限公司浙江桐乡314512

介绍了半精纺工艺路线,探讨了半精纺生产车间的设计改造及在设备配置和排列等方面应注意的事项。

关键词：半精纺生产车间工艺路线设计改造

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