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Remote monitoring system for maize seeding parameters based on Android and wireless communication

International Journal of Agricultural and Biological Engineering 2020年第6期13卷 159-165页

作者： Chunji Xie Dongxing Zhang Li yang Tao Cui Xiangjun zhong Yuhuan Li Youqiang ding Zhengliang ding College of Engineering China Agricultural UniversityBeijing 100083China

Most traditional maize seeding parameter monitoring devices use wired data *** problems include wiring troubles,short transmission *** human-computer interaction display terminals are unique and usually customized rather than universal.A remote monitoring system for maize seeding parameters based on Android and wireless communication was developed in this *** system used a single-chip microcomputer as the main controller and an infrared photoelectric sensor to capture seed *** Android terminal application was used to set and display the seeder’s seed parameter information and monitor *** Air202 communication module enabled remote data transmission,while the Global Positioning System(GPS)monitored the speed of the *** establishing a message queue telemetry transmission(MQTT)cloud served as a data freight station,data reception,storage and forwarding can be *** parameters can generate Excel spreadsheets in real-time for easy data processing and *** order to verify the reliability of the system,the seeding parameter monitoring comparison test and the multi-terminal remote monitoring test were *** results of the seeding parameter monitoring comparison test showed that the monitoring system of this study had higher monitoring *** maximum average relative error of seeding parameter monitoring was 0.4%,which had high monitoring *** multi-terminal remote monitoring test showed that the monitoring system of this research can adapt many types of Android terminals,realize the wireless connection,and realize remote synchronous monitoring at different *** study provides a reference for intelligent remote monitoring and intelligent agriculture on unmanned farms.

关键词： remote monitoring system maize seeding parameters Android and wireless communication remote synchronous monitoring intelligent agriculture

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Novel low-cost control system for large high-speed corn precision planters

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International Journal of Agricultural and Biological Engineering 2021年第2期14卷 151-158页

作者： Youqiang ding Li yang Dongxing Zhang Tao Cui Yuhuan Li Xiangjun zhong Chunji Xie Zhengliang ding College of Engineering China Agricultural UniversityBeijing 100083China Soil-Machine-Plant Key Laboratory of Ministry of Agriculture and Rural Affairs Beijing 100083China

Large high-speed corn precision planters can significantly improve seeding efficiency,but at present,there is no mature control technology in *** study proposed a novel low-cost control system for large high-speed corn precision planters based on multiple technologies such as embedded systems,controller area network(CAN),global positioning system(GPS),and Android development *** developed control system provided excellent expansion capabilities of more than 40 planter *** such as monitoring the planter status,adjusting seed density,calculating planting-area were *** experiments were performed under different GPS frequencies(fGPS),travel speeds,and seed *** showed that the working area relative error index(REI)and fGPS were negatively correlated,and the planter can achieve 0.84%error under the fGPS of 10 *** the travel speed was 10 km/h or 12 km/h,the average quality index(QI),miss index(MI),and precision index(PI)were superior to 92.84%,5.80%,and 18.57%under each seed spacing,respectively,QI and MI had no significant difference under each seed spacing(p<0.05).For a travel speed of 14 km/h,indexes values reached the worst level at seed spacing of 20 cm,but still met the requirements of Chinese national *** total cost of the control system for a 12-row corn precision planter is only 17.07%of similar products from *** summary,the developed control system can achieve preferable performance and costs much less than similar products obtained from abroad,which is suitable for promotion in China or other developing countries.

关键词： corn precision planter control system Android CAN bus GPS

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Computing Degree of Maps Between Manifolds

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Acta Mathematica Sinica,English Series 2005年第6期21卷 1277-1284页

作者： Yan Hong ding Jian zhong PAN Department of Mathematics Hebeg Normal University Shijiazhuang 050016 P. R. China Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 P. R. China

We determine the degrees of maps between two given closed （n-1）-connected 2n-mamifolds when n ≡ 1 （mod 8）.

关键词： 2n-manifolds degree

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Multiple Positive Solutions for a Fourth-order p-Laplacian Sturm-Liouville Boundary Value Problems on Time Scales

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Acta Mathematicae Applicatae Sinica 2015年第2期31卷 287-296页

作者： You-zheng ding zhong-li WEI School of Mathematics Shandong University Department of Mathematics Shandong Jianzhu University

In this paper, we investigate the existence of multiple positive solutions for the following fourthorder p-Laplacian Sturm-Liouville boundary value problems on time scales ﹛[φp（u^△△（t））]^△△= f（t, u（σ（t）））, t ∈ [a, b],α0 u（a）- β0u^△（a） = 0, γ0 u（σ（b））＋ δ0 u△（σ（b）） = 0,α0（φp（u^△△））（a）- β0（φp（u^△△））△（a） = 0,γ0（φp（u^△△））（σ（b））＋ δ0（φp（u^△△））△（σ（b）） = 0,where φp（s） is the p-Laplacian operator. Under growth conditions on the nonlinearity f some existence results of at least two and three positive solutions for the above problem are obtained by virtue of fixed point theorems on cone. In particular, the nonlinearity f may be both sublinear and superlinear.

关键词： time scales p-Laplacian equation positive solution fixed point theorem

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Coupling mechanism of mathematical models for sediment transport based on characteristic theory

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Science China(Technological Sciences) 2016年第11期59卷 1696-1706页

作者： ding Yun LI ZuiSen zhong DeYu KANG YanPing State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 China Zhejiang Institute of Hydraulics and Estuary Hangzhou 310008 China State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China Jiangsu Hydraulic Research Institute Nanjing 210017 China

This paper aims to explore the coupling mechanism between flow movement, sediment transport and riverbed evolution in currently widely used mathematical models for sediment transport. Based on characteristic theory, analytic forms of eigenvalues,eigenvectors and characteristic relationships of total-sediment transport model, bed-load transport model and suspenedload transport model were derived, respectively. The singular perturbation technology was implemented to obtain the asymptotic solutions to different families of eigenvalues. The results indicate that, interactions between motion variables were explicitly coupled in the characteristics of total-sediment transport model and bed-load transport model. Further qualitative and quantitative analysis demonstrates that high sediment transport intensity and significant riverbed change will inevitably affect the property of flow movement. In the process of deposition, sediment-laden flow will move faster when sediment transport intensity becomes stronger. In contrast, the wave of flow will propagate at slower speed as erosion intensity becomes *** most existing suspended-load transport models, however, the characteristics are decoupled as the interactions between motion variables cannot be integrally illustrated in eigenvalues, eigenvectors and characteristic relationship.

关键词： coupling mechanism mathematical models sediment transport characteristics eigenvalues

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Hydrogen-bonded Intramolecular Charge Transfer Excited State of Dimethylaminobenzophenone using Time Dependent Density Functional Theory

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Chinese Journal of Chemical Physics 2012年第6期25卷 654-658,I0003页

作者： Yu-ling Chu zhong yang Zhe-feng Pan Jing Liu Yue-yi Han Yong ding Peng Song Physical and Electronic and Information Engineering Institute Chifeng University Chifeng 024001China Department of Physics Liaoning University Shenyang 110036 China Department of Science Shenyang Aerospace University Shenyang 110136 China

Density functional theory and time-dependent density-functional theory have been used to investigate the photophysical properties and relaxation dynamics of dimethylaminobenzophe- none （DMABP） and its hydrogen-bonded DMABP-MeOH dimer. It is found that, in non- polar aprotic solvent, the transitions from So to S1 and S2 states of DMABP have both n→π and π→π＊ characters, with the locally excited feature mainly located on the C=O group and the partial CT one characterized by electron transfer mainly from the dimethylaminophenyl group to the C=O group. But when the intermolecular hydrogen bond C=O…H-O is formed, the highly polar intramolecular charge transfer character switches over to the first excited state of DMABP-MeOH dimer and the energy difference between the two low- lying electronically excited states increases. To gain insight into the relaxation dynamics of DMABP and DMABP-MeOH dimer in the excited state, the potential energy curves for con- formational relaxation are calculated. The formation of twisted intramolecular charge trans- fer state via diffusive twisting motion of the dimethylamino/dimethylaminophenyl groups is found to be the major relaxation process. In addition, the decay of the Si state of DMABP-MeOH dimer to the ground state, through nonradiative intermolecular hydrogen bond stretching vibrations, is facilitated by the formation of the hydrogen bond between DMABP and alcohols.

关键词： Hydrogen-bond Intramolecular charge transfer Relaxation dynamic Twistingdynamic

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Robust Control of Manned Submersible Vehicle With Nonlinear MPC and Disturbance Observer

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IEEE/CAA Journal of Automatica Sinica 2023年第5期10卷 1349-1351页

作者： Qiuxin zhong Xing Fang Zhengtao ding Fei Liu the Key Laboratory of Advanced Process Control for Light Industry of the Ministry of Education Jiangnan UniversityWuxi 214122China the Department of Electrical and Electronic Engineering University of ManchesterManchester M139PLUK

Dear Editor,This letter focuses on the trajectory tracking of 7000 m JIAOLONG manned submersible vehicle(MSV)with *** robust controller is realized by a composite control law,where an analytical nonlinear model predic... 详细信息

关键词： Nonlinear letter law

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H_∞ fault estimation for a class of linear time-delay systems in finite frequency domain

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Journal of Systems Engineering and Electronics 2010年第5期21卷 835-841页

作者： Quanchao Dong Maiying zhong Steven X. ding School of Control Science and Engineering Shandong University Jinan 250061 E R. China School of Instrumentation Science and Opto-electronics Engineering Beihang University Beijing 100191 P. R. China Institute for Automatic Control and Complex Systems University of Duisburg-Essen Duisburg 47057 Germany

This paper deals with the problem of H∞ fault estimation for linear time-delay systems in finite frequency *** a generalized coordinate change is applied to the original system such that in the new coordinates all the time-delay terms are injected by the system＇s input and *** an observer-based H∞ fault estimator with input and output injections is proposed for fault estimation with known frequency *** the aid of Generalized Kalman-Yakubovich-Popov lemma,sufficient conditions on the existence of the H∞ fault estimator are derived and a solution to the observer gain matrices is obtained by solving a set of linear matrix ***,a numerical example is given to illustrate the effectiveness of the proposed method.

关键词： fault estimation time-delay generalized coordinate change generalized Kalman-Yakubovich-Popov lemma finite frequency domain.

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Structure of human lysine methyltransferase Smyd2 reveals insights into the substrate divergence in Smyd proteins

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Journal of Molecular Cell Biology 2011年第5期3卷 293-300页

作者： Shutong Xu Chen zhong Tianlong Zhang Jianping ding State Key Laboratory of Molecular Biology and Research Center for Structural Biology Institute of Biochemistry and Cell BiologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China Graduate School of Chinese Academy of Sciences 320 YueYang RoadShanghai 200031China

The SET-and myeloid-Nervy-DEAF-1(MYND)-domain containing(Smyd)lysine methyltransferases 1–3 share relatively high sequence similarity but exhibit divergence in the substrate *** we report the crystal structure of the full-length human Smyd2 in complex with S-adenosyl-L-homocysteine(AdoHcy).Although the Smyd1–3 enzymes are similar in the overall structure,detailed comparisons demonstrate that they differ substantially in the potential substrate-binding *** binding site of Smyd3 consists mainly of a deep and narrow pocket,while those of Smyd1 and Smyd2 consist of a comparable pocket and a long *** addition,Smyd2,which has lysine methyltransferase activity on histone H3-lysine 36,exhibits substantial differences in the wall of the substrate-binding pocket compared with those of Smyd1 and Smyd3 which have activity specifically on histone H3-lysine *** differences in the substrate-binding site might account for the observed divergence in the specificity and methylation state of the *** modeling study of Smyd2 in complex with a p53 peptide indicates that mono-methylation of p53-Lys372 might result in steric conflict of the methyl group with the surrounding residues of Smyd2,providing a structural explanation for the inhibitory effect of the SET7/9-mediated mono-methylation of p53-Lys372 on the Smyd2-mediated methylation of p53-Lys370.

关键词： Smyd2 Smyd proteins SET family histone lysine methyltransferase epigenetics

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Three new phenanthrenes from Monomeria barbata Lindl.

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Chinese Chemical Letters 2010年第3期21卷 325-328页

作者： yang, Ming Hui Cai, Le Li, Mei Hong Zeng, Xiang Hui yang, Ya Bin ding, zhong Tao Yunnan Univ Sch Chem Sci & Technol Minist Educ Key Lab Med Chem Nat Resource Kunming 650091 Peoples R China Dali Coll Dept Biochem Dali 671000 Peoples R China

Three new monophenanthrene compounds were isolated from an acetone extract of the tubers of Monomeria barbata Lindl. (Orchidaceae).Using spectroscopic methods,the structures of compounds 1-3 were determined as 1,4,7-trihydroxy-2-methoxy- 9,10-dihydrophenanthrene(1),1-(p-hydroxybenzoyl)-2-methoxy-4,7-dihydroxy-9,10-dihydrophenanthrene(2),1,3,8-tri(p-hydroxybenzyl) -4-methoxy-phenanthrene-4,7-diol(3).These compounds showed cytotoxicities on four tumor cell lines(HepG2, HL-60,Skov-3,A431).

关键词： Monomeria barbata Orchidaceae Monophenanthrene Cytotoxicity

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