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Monitoring nitrogen concentration of oilseed rape from hyperspectral data using radial basis function

International Journal of Digital Earth 2013年第6期6卷 550-562页

作者： fumin wang Jingfeng Huang Yuan wang Zhuanyu Liu Dailiang Peng Feifeng Cao Institute of Hydrology and Water Resources Zhejiang UniversityHangzhouChina Institute of Agricultural Remote Sensing&Information Application Zhejiang UniversityHangzhouChina Institute of Remote Sensing and Earth Sciences Hangzhou Normal UniversityHangzhouChina Center for Earth Observation and Digital Earth Chinese Academy of SciencesBeijingChina Bureau of Water Resources and Hydropower Engineering of Zhejiang Provinces HangzhouChina

Remote sensing technology is the important tool of digital earth,it can facilitate nutrient management in sustainable cropping *** the study,two types of radial basis function(RBF)neural network approaches,the standard radial basis function(SRBF)neural networks and the modified type of RBF,generalized regression neural networks(GRNN),were investigated in estimating the nitrogen concentrations of oilseed rape canopy using vegetation indices(VIs)and hyperspectral *** analyses were performed to the spectral variables and the *** Root Mean Square Error(RMSE)and determination coefficients(R2)were used to assess their predictability of nitrogen *** all spectral variables(VIs and hyperspectral reflectance),the GRNN method produced more accurate estimates of nitrogen concentrations than did the SRBF method at all ranges of nitrogen concentrations,and the better agreements between the measured and the predicted nitrogen concentration were obtained with the GRNN *** indicated that the GRNN method is prior to the SRBF method in estimation of nitrogen *** the VIs,the Modified Chlorophyll Absorption in Reflectance Index(MCARI),MCARI1510,and Transformed Chlorophyll Absorption in Reflectance Index are better than the others in estimating oilseed rape canopy nitrogen *** to the results from VIs,the hyperspectral reflectance data also gave an acceptable *** study showed that nitrogen concentrations of oilseed rape canopy could be monitored using remotely sensed data and the RBF method,especially the GRNN method,is a useful explorative tool for oilseed rape nitrogen concentration monitoring when applied on hyperspectral data.

关键词： vegetation indices hyperspectral data nitrogen concentration artifi-cial neural network radial basis function agriculture remote sensing

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In situ generation and detection of methyl radical by voltammetry

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Chinese Science Bulletin 2003年第11期48卷 1093-1096页

作者： SONG Junfeng CHEN Zhaopeng GUO Wei wang fumin Institute of Analytical Science Northwest UniversityInstitute of Analytical Science Northwest UniversityDepartment of Chemistry Northwest UniversityDepartment of Chemistry Weinan Normal College Xi'an 710069 ChinaXi'an 710069 ChinaXi'an 710069 ChinaWeinan 714000 China

In persulfate-acetate, dimethyl sulfoxide or tert-butyl alcohol systems, in situ generation and detection of methyl free radical are realized with voltammetry. It includes the following successive processes. The persulfate S2O82 is polarographically reduced via one-electron addition to sulfate radical SO4, the SO4 initiates chain reaction with acetate, dimethyl sulfoxide, or tert-butyl alcohol on the electrode surface to produce a methyl radical, and one-electron reduction of the methyl radical yields its polarographic reduction wave. In comparison with the known techniques such as ultraviolet radiolysis coupling with electron spin resonance, etc., the proposed method is simple, sensitive and selective.

关键词：伏安法二甲基亚砜醋酸盐甲基自由基辐射分解 SO4^ˉ 硫酸根离子

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CFD simulation study of the effect of baffles on the fluidized bed for hydrogenation of silicon tetrachloride

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Chinese Journal of Chemical Engineering 2022年第5期35卷 219-228页

作者： Ning Liu Xingping Liu fumin wang Feng Xin Mingshuai Sun Yi Zhai Xubin Zhang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Xinte Energy Co. Ltd.UrumchiXinjiang 830011China

In this study,the effect of channel baffles and louver baffles on the flow pattern in the large-scale industrial fluidized beds was studied by computational fluid dynamics(CFD)***,the effect of flow pattern on the chemical reaction performance was studied for the first *** results showed that the gas velocity distributed more uniformly,solid particles dispersed more homogeneously and aggregation scarcely occurred in the fluidized bed with louver baffles than that with channel *** residence time distribution indicated that louver baffles remarkably suppressed gas back-mixing in comparison with channel *** reasonable agreements of pressure distribution and reaction results between the simulation in the bed with channel baffles and the data on a large-scale industrial apparatus demonstrated the accuracy of the CFD *** predicted conversion of SiCl_(4) in the bed with louver baffles(27.44%)was higher than that with channel baffles(22.69%),indicating that louver baffles markedly improved the performance of the fluidized *** study could provide useful information for future structural improvements of baffles in large-scale fluidized beds.

关键词： Fluidized-bed Baffle Gas-solids flow Hydrogenation Computational fluid dynamics

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In Situ Growth of 3D Hierarchical ZnO@Ni_xCo_(1-x)(OH)_y Core/Shell Nanowire/Nanosheet Arrays on Ni Foam for High-Performance Aqueous Hybrid Supercapacitors

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Transactions of Tianjin University 2018年第3期24卷 201-211页

作者： fumin wang Mengchao Liu Xubin Zhang Guojun Lv Mingshuai Sun School of Chemical Engineering and Technology Tianjin University

In this study, we designed and synthesized a novel battery-type electrode featuring three-dimensional(3D) hierarchical ZnO@Ni_xCo_(1-x)(OH)_y core/shell nanowire/nanosheet arrays arranged on Nifoam substrate via a two-step protocol including a wet chemical process followed by electro-deposition. We then characterized its composition, structure and surface morphology by X-ray diff raction, energy-dispersive X-ray spectrometry(EDS), X-ray photoelectron spectroscopy, scanning electron microscopy(SEM), transmission electron microscopy, EDS elemental mapping. Our electrochemical measurements show that the ZnO@Ni_(0.67)Co_(0.33)(OH)_y electrode material exhibited a noticeably high specific capacity of as much as 255(mA ·h)/g at 1 A/g. Additionally, it demonstrated a superior rate capability, as well as an excellent cycling stability with 81.6% capacity retention over 2000 cycles at 5 A/g. This sample delivered a high energy density of 64 W·h/kg and a power density of 250 W/kg at a current density of 1 A/g. With such remarkable electrochemical properties, we expect the 3D hierarchical hybrid electrode material presented in this work to have promising applications for the next generation of energy storage systems.

关键词： ZnO@NixCo1-x(OH)y Core/shell nanowire/nanosheet array Supercapacitor Ni foam

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Directional design and synthesis of high-yield hollow Fe-MFI zeolite encapsulating ultra-small Fe_(2)O_(3) nanoparticles by using mother liquid

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Nano Research 2021年第11期14卷 4304-4313页

作者： Yi Zhai fumin wang Xubin Zhang Guojun Lv Yuzhou Wu Tao Jiang Qing Zhang Mengyue Li Mengyao Li Yongkui Liu School of Chemical Engineering and Technology Tianjin UniversityTianjin300350China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang212003China

How to directionally design the hollow zeolite via a green route is of great significance. Here, we successfully synthesized the hollow Fe-silicate-1 encapsulated ultra-small Fe_(2)O_(3) nanoparticles (2.5 nm) with higher yield (85.2%) by mother liquid than traditional dissolution-recrystallization for the first time, which was achieved by precisely regulating the number and distribution of defects in zeolite and cleverly utilizing the TPAOH and nuclei in mother liquor. The effects of synthetic temperature, synthetic period and addition amount of parent zeolite on the formation of hollow zeolite have been investigated and the effect of synthetic conditions on the defects in parent zeolite has been also firstly quantified. The corresponding formation mechanism has been proposed. The abundant inner defects provided by the zeolite synthesized at 130 °C for 1 day and large amount of TPAOH remaining in mother liquid are conducive to the formation of hollow zeolite. Meanwhile, both parent zeolite and nuclei (4-, 5-member rings and structure units) in mother liquid obtained at 130 °C play the crucial roles in enhancing the zeolite yield. Notably, Fe_(2)O_(3) nanoparticles could decompose into small fragments by the interaction with nuclei in mother liquid. Partial ultra-small Fe_(2)O_(3) nanoparticles would be encapsulated in cavity and the rest could be inserted in the zeolite framework, which is significantly different from the conventional dissolution-recrystallization mechanism. The obtained encapsulated catalyst shows the superior catalytic performance and stability in phenol and tetracycline degradation reactions.

关键词： mother liquid hollow zeolite high yield defect sites degradation reaction

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Analysis of sex pheromone production and field trapping of the Asian corn borer(Ostrinia furnacalis Guenée)in Xinjiang,China

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Journal of Integrative Agriculture 2023年第4期22卷 1093-1103页

作者： DENG Jian-yu LAN Chen-yi-hang ZHOU Jun-xiang YAO Yu-bo YIN Xiao-hui FU Kai-yun DING Xin-hua GUO Wen-chao LIU Wen wang Na fumin wang The Key Laboratory for Quality Improvement of Agricultural Products of Zhejiang Province/Department of Plant Protection Advanced College of Agricultural SciencesZhejiang A&F UniversityHangzhou 311300P.R.China Key Laboratory of Integrated Pest Management on Crops in Northwestern Oasis Ministry of Agriculture and Rural Affairs/Institute of Plant ProtectionXinjiang Academy of Agricultural SciencesUrumqi 830091P.R.China Agricultural Technology Extension Center of Yining County Yining 835000P.R.China Division of Plant and Soil Sciences Davis College of AgricultureNatural Resources and DesignWest Virginia UniversityMorgantown 26506USA

Identifying the sex pheromone systems of local pest populations facilitates their management,especially for moth species that show significant geographic variation in sex pheromone *** investigated the pheromone production and behavioral responses of the Asian corn borer(Ostrinia furnacalis Guenée;ACB)in Xinjiang,*** ACB produces three compounds:(Z)-12-tetradecenyl acetate(Z12-14:Ac)and(E)-12-tetradecenyl acetate(E12-14:Ac)which are two sex pheromone compounds,and n-tetradecyl acetate(14:Ac)which has variable roles in mediating behavioral *** ratios of these three compounds produced in female gland are geographically distinct among different *** analysis of pheromone production showed that the proportions of Z12-14:Ac in the E/Z isomers(i.e.,Z and E12-14:Ac)and the proportions of 14:Ac in the ternary blend respectively averaged 60.46%(SD=5.26)and 25.00%(SD=7.37),with their probabilities normally or near-normally *** experiments in a cornfield indicated that deploying the E/Z isomers and the three compounds in rubber septa close to their gland ratios yielded the most captured males,while other ratios that deviated from the gland ratios showed reduced field *** ternary blend was significantly more attractive to males than the E/Z isomers in the field,indicating a functional role of 14:Ac as the third pheromone component used by the local ***,the dose-response test demonstrated that the application of the three compounds at dosages between 200 and 350μg attracted significantly more males compared to other ***,the characterization of this local ACB pheromone system provides additional information about its geographic variation and serves as a basis for optimizing the pheromone-mediated control of this pest in Xinjiang.

关键词： geographic variation Ostrinia furnacalis Asian corn borer sex pheromone pheromone titer field trapping

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Efficient and stable Ru(Ⅲ)-choline chloride catalyst system with low Ru content for non-mercury acetylene hydrochlorination

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Chinese Journal of Catalysis 2018年第11期39卷 1770-1781页

作者： Hang Li Botao Wu Jianhui wang fumin wang Xubin Zhang Gang wang Haichao Li School of Chemical Engineering&Technology Collaborative Innovation Center of Chemical Science and Chemical Engineering(Tianjin)Tianjin UniversityTianjin 300350China Department of Chemistry School of ScienceTianjin UniversityTianjin 300072China College of Chemistry and Chemical Engineering Qinghai Nationalities UniversityXining 810007QinghaiChina

Herein,we report an excellent,supported Ru(III)‐ChCl/AC catalyst with lower Ru content,where the ionic complex ChRuCl4 serves as the active component for acetylene *** prepared heterogeneous Ru‐10%ChCl/AC catalyst shows excellent activity and long‐term *** this system,ChCl provides an environment for the ChRuCl4 to be stabilized as Ru(III),thus suppressing the reduction of the active species and the aggregation of ruthenium species during the *** interaction between reactants and catalyst species was investigated by catalyst characterizations in combination with DFT calculations to disclose the effect of the ChRuCl4 complex and ChCl on the catalytic *** inexpensive,efficient,and long‐term catalyst is a competitive candidate for application in the hydrochlorination industry.

关键词： Acetylene hydrochlorination Catalytic activity Heterogeneous catalysis Ionic complex Ruthenium

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酮洛芬的伏安行为及吸附缔合平行极谱催化波研究

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化学通报 2007年第2期70卷 134-138页

作者：王福民渭南师范学院化学化工系渭南714000

采用线性扫描极谱法、循环伏安法及恒电位电解法在NH4Cl-NH3.H2O(pH9.5)缓冲液中研究了酮洛芬(KPF)的伏安行为和极谱催化波的产生机理。结果表明,KPF的羰基首先发生1e-和1H+还原,产生中间体质子化羰基自由基,该自由基再以同样方式进一... 详细信息

采用线性扫描极谱法、循环伏安法及恒电位电解法在NH4Cl-NH3.H2O(pH9.5)缓冲液中研究了酮洛芬(KPF)的伏安行为和极谱催化波的产生机理。结果表明,KPF的羰基首先发生1e-和1H+还原,产生中间体质子化羰基自由基,该自由基再以同样方式进一步还原生成相应的羟基化合物,并伴随有化学反应;引入K2S2O8后,S2O82-作为配位体与吸附在电极表面质子化的KPF形成缔合物,引起峰电位负移,S2O82-及其还原中间产物SO4.-氧化经1e-和1H+还原的KPF羰基自由基,使峰电流显著增加,从而产生了KPF的吸附缔合平行极谱催化波。测得S2O82-氧化KPF质子化羰基自由基的表观速率常数Kf=1.2×104/s。

关键词：酮洛芬过硫酸钾极谱催化波自由基

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Scheme design technique for urban traffic management planning

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Journal of Southeast University(English Edition) 2005年第3期21卷 353-358页

作者：王炜王富民东南大学交通学院南京210096

Management tactics for urban traffic management are *** tactics that underlie traffic demand management （TDM） are preferential development tactics, controlled development tactics,prohibited development tactics and economic lever tactics,and those that underlie traffic system management （TSM） are node traffic management tactics,arterial traffic management tactics and area traffic management *** specific contents and design methods of urban traffic total demand control,urban traffic structure optimization,road traffic movement organization based on TDM and intersection traffic management,road signs and markings management,optimized design of traffic signals and management of parking spaces based on TSM are put *** urban traffic management planning scheme design method has already been used in the urban traffic management “Smooth Traffic Project” in China.

关键词： traffic demand traffic system traffic management

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Multi-feature weight factor extraction and survival risk assessment of hepatocellular carcinoma based on a clinical missing dataset-independent support vector machine

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iLIVER 2022年第3期1卷 154-158页

作者： fumin wang Nan Zhang Xiaoning Wu Wei Zhang Qiang Lu Rongqian Wu Xu-Feng Zhang Hui Guo Yi Lv Department of Hepatobiliary Surgery and Institute of Advanced Surgical Technology and Engineering The First Affiliated Hospital of Xi'an Jiaotong UniversityXi'anChina Department of Medical Oncology The First Affiliated Hospital of Xi'an Jiaotong UniversityXi'anChina

Background:In clinical datasets,the characteristics of an individual patient vary so much that data loss becomes a normal event,which may be a unignorable dilemma in clinical data ***,the construction of a machine learning model aimed at missing clinical datasets(MCD)is of great clinical ***:All included patients were divided into two groups according to outcome within a period of up to 36 months or *** following characteristics(variables)were collected:age,sex,Child-Pugh status,hepatitis status,cirrhosis status,treatment,tumor size,portal vein tumor thrombus,and alpha fetoprotein(μg/mL),and a missing dataset-independent support vector machine(MDI-SVM)independent of missing data was built for the ***:A MCD-independent SVM was developed based on clinical data from 1334 patients with hepatocellular carcinoma(HCC)at a single center,which had an accuracy of 84.43%in the survival analysis in the presence of 5%missing *** on the different combinations of features,our model calculated five features(tumor size,age,treatment,hepatitis status,and alpha fetoprotein)that had the greatest impact on survival in patients with HCC and extracted their weighting ***:A MCD-independent SVM was developed to achieve prognosis prediction for patients with HCC in the absence of first-visit data.

关键词： Machine learning HCC MDI-SVM

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