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Automatic image segmentation method for cotton leaves with disease under natural environment

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Journal of Integrative Agriculture 2018年第8期17卷 1800-1814页

作者： ZHANG jian-hua KONG Fan-tao WU jian-zhai HAN Shu-qing zhai Zhi-fen Agricultural Information Institute Chinese Academy of Agricultural Sciences/Key Laboratory of Agricultural Big DataMinistry of AgricultureBeijing 100081P.R.China Chinese Academy of Agricultural Engineering Beijing 100125P.R.China

In order to improve the image segmentation performance of cotton leaves in natural environment, an automatic segmentation model of diseased leaf with active gradient and local information is proposed. Firstly, a segmented monotone decreasing edge composite function is proposed to accelerate the evolution of the level set curve in the gradient smooth region. Secondly, canny edge detection operator gradient is introduced into the model as the global information. In the process of the evolution of the level set function, the guidance information of the energy function is used to guide the curve evolution according to the local information of the image, and the smooth contour curve is obtained. And the main direction of the evolution of the level set curve is controlled according to the global gradient information, which effectively overcomes the local minima in the process of the evolution of the level set function. Finally, the Heaviside function is introduced into the energy function to smooth the contours of the motion and to increase the penalty function Φ(x) to calibrate the deviation of the level set function so that the level set is smooth and closed. The results showed that the model of cotton leaf edge profile curve could be obtained in the model of cotton leaf covered by bare soil, straw mulching and plastic film mulching, and the ideal edge of the ROI could be realized when the light was not uniform. In the complex background, the model can segment the leaves of the cotton with uneven illumination, shadow and weed background, and it is better to realize the ideal extraction of the edge of the blade. Compared with the Geodesic Active Contour(GAC) algorithm, Chan-Vese(C-V) algorithm and Local Binary Fitting(LBF) algorithm, it is found that the model has the advantages of segmentation accuracy and running time when processing seven kinds of cotton disease leaves images, including uneven lighting, leaf disease spot blur, adhesive diseased leaf, shadow, complex b

关键词： local binary fitting model natural environment cotton disease leaves image segmentation

Quantum entangled connectivity and functional connectivity of human brain

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International Journal of Biomathematics 2023年第8期16卷 109-120页

作者： You zhai Linjie Qiu Chenxiang He Lina Wang jian zhai Research Center for Clinical Pharmacy Zhejiang Provincial Key Laboratory for Drug Evaluation and Clinical Research The First Affiliated Hospital Zhejiang University School of Medicine Hangzhou310003China School of Mathematical Sciences Zhejiang University Hangzhou 310027China The Second Affiliated Hospital Zhejiang University School of Medicine Hangzhou 310003 China

Quantum process may conduce to brain ***,it was proposed that the Posner molecules,Cag(PO4)6,can serve as neural qubits,which can maintain quantum entanglement between phosphorus nuclei for quite a long *** study the process from entangled Posner molecules to the synchronized activities of brain.A diffusion model of Posner molecules with appropriate boundary conditions and the mean first arriving time of Posner molecules from one area of brain to another are *** establish linkages between the quantum entangled connectivity of brain and the remaining time of entangled Posner molecules before *** on these results,we find direct correlations between entangled Posner molecules and the functional connectivity of human ***,we discover that the quantum entangled connectivity depends on age.

关键词： Posner molecule diffusion model quantum entangled connectivity functional connectivity

A Novel Thermally Coupled Reactive Distillation Column for the Hydrolysis of Methyl Acetate

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China Petroleum Processing & Petrochemical Technology 2015年第2期17卷 101-108页

作者： zhai jian Liu Yuliang Sun Lanyi Wang Rujun State Key Laboratory of Heavy Oil Processing China University of Petroleum China Petroleum Engineering Co. Ltd.Beijing Company

A different pressure thermally coupled reactive distillation column(DPT-RD) for the hydrolysis of methyl acetate(Me Ac) is developed, and its design and optimization procedures are investigated. The sensitivity analysis is carried out to minimize the energy consumption, which is associated with the total annual cost(TAC). The influence of the proposed DPTRD scheme on energy consumption and economic efficiency are evaluated in comparison with the conventional reactive distillation column(CRD). Both the DPT-RD and CRD are simulated with the Aspen Plus?, and it can be observed that for the DPT-RD the energy consumption and the TAC are reduced, and the thermodynamic efficiency is increased as compared with the CRD process.

关键词： different pressure thermally coupled distillation reactive distillation thermodynamic efficiency energy savings total annual cost

Finite element and experimental analysis of Vickers indentation testing on Al_2O_3 with diamond-like carbon coating

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Journal of Central South University 2012年第5期19卷 1175-1181页

作者： zhai jian-guang WANG Yi-qi KIM Tae-gyu SONG Jung-il Department of Mechanical Engineering Changwon National University Changwon 641-773 Korea Department of Nanosystem and Nanoprocess Engineering Pusan National University Pusan 609-735 Korea

Numerical simulation and experimental study of the Vickers indentation testing of the Al2O3 ceramic coated by diamond-like carbon(DLC) layer were *** numerical analysis was implemented by a two-dimensional finite element(FE) axis symmetry *** analysis results gave insight into the fracture mechanism of DLC films coated on brittle ceramic(Al2O3) *** maximum principal stress field was used to locate the most expected area for crack formation and propagation during the Vickers indentation *** results show that the median crack initiates in the interface under indenter,before ring crack occurs as the indenter presses ***,the plastic deformation appears when the indenter penetrates into the *** thicker DLC coating increases the Vickers hardness and fracture toughness.

关键词： Vickers indentation testing finite element diamond-like carbon Al2O3 fracture toughness

Synthesis of Mesostructured Iron Oxides with Potential As(V) Adsorption Application

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Chemical Research in Chinese Universities 2012年第4期28卷 559-562页

作者： LI Fei-hu FU Xiao-ru HUANG Jie zhai jian-ping jiangsu Provincial Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044P.R.China State Key Laboratory of Pollution Control and Resource Reuse School of EnvironmentNanjing UniversityNanjing 210046P.R.China

Mesostructured iron oxides（MIOs） were nanocasted from a plugged hexagonal templated silica（PHTS） with a Brunauer-Emmett-Teller（BET） surface area of 694 m 2 /*** of X-ray diffraction（XRD）,transmission electron microscopy（TEM） and N 2 adsorption-desorption suggest that the nanocasted MIOs are synthetic hematite（α-Fe2O3） with a wormhole-like mesoporous ***（V） adsorption test shows that the selected MIO—MIO-500（calcinated at 500 °C） with a BET surface area of 82 m^ 2 /g has a maximum adsorption capacity of 5.39 mg/g for As（V）,which is 2.5 times as large as that of natural hematite *** study suggests that MIOs could be potentially used as the adsorbent of As（V） in wastewater.

关键词： Mesostructured iron oxide Plugged hexagonal templated silica(PHTS) Nanocasting Arsenate Adsorption

Dual functional AgNPs-M13 phage composite serves as antibacterial film and sensing probe for monitoring the corrosion of chromium-containing dental alloys

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Chinese Chemical Letters 2020年第1期31卷 145-149页

作者： Ting Yang Na Li Xiaoyan Wang jian zhai Bo Hu Mingli Chen jianhua Wang Research Center for Analytical Sciences Department of ChemistryCollege of SciencesNortheastern UniversityShenyang 110819China Department of Biochemistry and Molecular Biology School of Life SciencesChina Medical UniversityShenyang 110122China

The preparation of silver nanoparticles(AgNPs)with microbe or plant tissues as bio-template offers green approach,while it suffers from low harvest and purification is ***,we propose a facile protocol for one-pot preparation of AgNPs using M13 phage as bio-template by simply mixing AgN03 solution with alkali M13 *** the obtained AgNPs-M13 phage composite,Cr(Ⅲ)selectively coordinates with the amino residues on phage surface and leads to the aggregation of AgNPs through the bridging of M13 *** makes it feasible for colorimetric sensing of Cr(Ⅲ)by measuring the absorbance ratio of AgNPs at 600 and 405 nm,which provides a LOD of 14 nmol/*** composite also showed favorable bactericidal activity for both Gram-positive and Gram-negative bacteria,making it a promising candidate as antibacterial film in chromium-containing dental alloys and meanwhile serve as a sensing probe for monitoring the corrosion of the dental alloys.

关键词： AgNPs-M13 phage composite Green preparation Bactericidal activity Colorimetric sensing Cr(Ⅲ)

Design and Control of Self-Heat Recuperative Distillation Process for Separation of Close-Boiling Mixtures: n-Butanol and iso-Butanol

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China Petroleum Processing & Petrochemical Technology 2015年第4期17卷 111-120页

作者： Li Lumin Liu Yuliang zhai jian Sun Lanyi Tian Yuanyu State Key Laboratory of Heavy Oil Processing China University of Petroleum

In order to explore the advantages of self-heat recuperative distillation(SHRD) process, the design and control of the SHRD process was studied for the separation of n-butanol and iso-butanol mixtures. The economic superiority of SHRD process is presented when a comparison on the total annual cost(TAC) of the conventional distillation process, the vapor recompression distillation process and the SHRD process was made. For the SHRD process, 37.74% and 11.35% savings of TAC can be achieved as compared to the conventional distillation process and vapor recompression distillation process, respectively. The dynamic characteristics of this promising SHRD sequence had been studied, and the dynamic responses demonstrated that 10% changes in both feed flow rate and feed composition can be well handled by the control strategy with dual-temperature control. It is proven that the SHRD system not only can provide economical savings but also can operate normally with good controllability.

关键词： n-butanol iso-butanol self-heat recuperative distillation total annual cost control

Impact of climate change on maize yield in China from 1979 to 2016

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Journal of Integrative Agriculture 2021年第1期20卷 289-299页

作者： WU jian-zhai ZHANG Jing GE Zhang-ming XING Li-wei HAN Shu-qing SHEN Chen KONG Fan-tao Agricultural Information Institute Chinese Academy of Agricultural Sciences/Key Laboratory of Agricultural Big Data Ministry of Agriculture and Rural Affairs Beijing 100081P.R.China Institute of Special Animal and Plant Sciences Chinese Academy of Agricultural SciencesJilin 130112P.R.China

Climate change severely impacts agricultural production, which jeopardizes food security. China is the second largest maize producer in the world and also the largest consumer of maize. Analyzing the impact of climate change on maize yields can provide effective guidance to national and international economics and politics. Panel models are unable to determine the group-wise heteroscedasticity, cross-sectional correlation and autocorrelation of datasets, therefore we adopted the feasible generalized least square(FGLS) model to evaluate the impact of climate change on maize yields in China from 1979–2016 and got the following results:(1) During the 1979–2016 period, increases in temperature negatively impacted the maize yield of China. For every 1℃ increase in temperature, the maize yield was reduced by 5.19 kg 667 m^–2(1.7%). Precipitation increased only marginally during this time, and therefore its impact on the maize yield was negligible. For every 1 mm increase in precipitation, the maize yield increased by an insignificant amount of 0.043 kg 667 m^–2(0.014%).(2) The impacts of climate change on maize yield differ spatially, with more significant impacts experienced in southern China. In this region, a 1℃ increase in temperature resulted in a 7.49 kg 667 m^–2 decrease in the maize yield, while the impact of temperature on the maize yield in northern China was insignificant. For every 1 mm increase in precipitation, the maize yield increased by 0.013 kg 667 m^–2 in southern China and 0.066 kg 667 m^–2 in northern China.(3) The resilience of the maize crop to climate change is strong. The marginal effect of temperature in both southern and northern China during the 1990–2016 period was smaller than that for the 1979–2016 period.

关键词： climate change maize yield FGLS model China

Techniques for Treating Sulphuric Acid Pickling Waste Liquid of Steel Industry

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Meteorological and Environmental Research 2013年第5期4卷 44-49页

作者： jian zhai Chunhua jiang jian Wu Engineering Technology Research and Development Center of the Chemical Engineering Application in jiangsu Province Nanjing College of Chemical Technology jiangsu Academy of Environmental Sciences

Pickling waste liquid of the steel industry is included in National Hazardous Wastes Catalogue because of its high corrosion and large discharge. The techniques for treating pickling waste liquid （ H2SO4 ） in steel industry is summarized. The advantages, disadvantages and applied ranges of all kinds of control technologies are comparatively analysed. The research trends of techniques for treating pickling waste liquid （ H2SO4 ） are the resource reclamation technologies in future which is pointed out in the paper.

关键词： Steel industry Pickli'ng waste liquid Treatment techniques China