检索结果-南通市图书馆

Development of real-time onion disease monitoring system using image acquisition

Frontiers of Agricultural Science and Engineering 2018年第4期5卷 469-474页

作者： Du-han KIM Kyeong-Hwan LEE Chang-Hyun choi Tae-Hyun choi yong-Joo KIM Department of Biosystems Machinery Engineering Chung-Nam National UniversityDaejeon 305-764Republic of Korea Department of Rural and Biosystems Engineering Chonnam National UniversityGwangju 500-757Republic of Korea Department of Bio-Mechatronic Engineering Sungkyunkwan UniversitySuwonGyeonggi 440-746Republic of Korea Sensoreye R&D Solutions Daejeon 302-861Republic of Korea

In this study, real-time disease monitoring was conducted on onion which is the most representative crop in Republic of Korea, using an image acquisition system newly developed for the mobile measurement of phenotype. The purpose of this study was to improve the accuracy of prediction of disease and state variables by processing images acquired from monitoring. The image acquisition system was consisted of two parts, a motorized driving system and a PTZ(pan, tilt and zoom) camera to take images of the plants. The acquired images were processed as follows. Noise was removed through an image filter and RGB(red, green and blue) colors were converted to HSV(hue, saturation and value), which enabled thresholding of areas with different colors and properties for image binarization by comparing the color of onion leaf with ambient areas. Four objects with the most significant browning in the onion leaf to the naked eye were selected as the samples for data acquired. The thresholding method with image processing was found to be superior to the naked eye in identifying accurate disease areas. In addition, it was found that the incidence of disease was different in each disease area ratio. As a result, the use of image acquisition system in image processing analysis will enable more prompt detection of any changes in the onion and monitoring of disease outbreaks during the crop lifecycle.

关键词： imaging acquisition system disease downy mildew onion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Primordial germ cell-mediated transgenesis and genome editing in birds

引用

Journal of Animal Science and Biotechnology 2018年第2期9卷 257-267页

作者： Jae yong han Young Hyun Park Department of Agricultural Biotechnology and Research Institute of Agriculture and Life Sciences College of Agriculture and Life Sciences Seoul National University Institute for Biomedical Sciences Shinshu University

Transgenesis and genome editing in birds are based on a unique germline transmission system using primordial germ cells(PGCs), which is quite different from the mammalian transgenic and genome editing system. PGCs are progenitor cells of gametes that can deliver genetic information to the next generation. Since avian PGCs were first discovered in nineteenth century, there have been numerous efforts to reveal their origin, specification, and unique migration pattern, and to improve germline transmission efficiency. Recent advances in the isolation and in vitro culture of avian PGCs with genetic manipulation and genome editing tools enable the development of valuable avian models that were unavailable before. However, many challenges remain in the production of transgenic and genome-edited birds,including the precise control of germline transmission, introduction of exogenous genes, and genome editing in ***, establishing reliable germline-competent PGCs and applying precise genome editing systems are critical current issues in the production of avian models. Here, we introduce a historical overview of avian PGCs and their application, including improved techniques and methodologies in the production of transgenic and genome-edited birds, and we discuss the future potential applications of transgenic and genome-edited birds to provide opportunities and benefits for humans.

关键词： Avian Genome editing Primordial germ cell Transgenesis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

CONFORMAL RESTRICTION MEASURES ON LOOPS SURROUNDING AN INTERIOR POINT

引用

Acta Mathematica Scientia 2021年第6期41卷 1873-1886页

作者： yong han Yuefei WANG College of Mathematics and Statistics Shenzhen UniversityShenzhen518060China Institute of Mathematics Academy of Mathematics and Systems SciencesChinese Academy of SciencesBeijing100190China

A conformal restriction measure is a probability measure which is used to describe the law of a random connected subset in a simply connected domain that satisfies a certain conformal restriction property. Usually there are three kinds of conformal restriction measures: one (called the chordal restriction measure) has two given boundary points of the random set, the second (called the radial restriction measure) has one boundary point and one interior point in the random set, and the third (called the tri-chordal restriction measure) has three boundary points in the random set. In this article, we will define a new probability measure such that the random set associated to it contains one given interior point and does not intersect with the boundary. Furthermore, we will show that this measure can be characterized by one parameter;we will also construct this one-parameter family of measures in two ways and obtain several properties.

关键词： self-avoiding loops conformal restriction measure SLE Brownian loop measure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Boundedness of Caldero'n-Zygmund operators in product Hardy spaces

引用

Applied Mathematics(A Journal of Chinese Universities) 2009年第3期24卷 321-335页

作者： han yong-sheng YANG Da-chun Department of Mathematics Auburn University Auburn AL 36849-5310 USA School of Mathematical Sciences Beijing Normal University Laboratory of Mathematics and Complex Systems Ministry of Education Beijing 100875 China (Corresponding author)

By means of vector-valued product Calderón-Zygmund operators and some subtle estimates,the boundedness in product Hardy spaces on R^n × R^m of Calderón-Zygmund operators introduced by J.L. Journé is established.

关键词： Hardy space product domain Calderón-Zygmund operator vector-valued operator

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Accelerating degradation rate of pure iron by zinc ion implantation

引用

Regenerative Biomaterials 2016年第4期3卷 205-215页

作者： Tao Huang Yufeng Zheng yong han State Key Laboratory for Turbulence and Complex System and Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China State Key Laboratory for Mechanical Behavior of Materials Xian Jiaotong UniversityXian 710049China

Pure iron has been considered as a promising candidate for biodegradable implant ***,a faster degradation rate of pure iron is needed to meet the clinical *** this work,metal vapor vacuum arc technology was adopted to implant zinc ions into the surface of pure *** showed that the implantation depth of zinc ions was about 60 *** degradation rate of pure iron was found to be accelerated after zinc ion *** cytotoxicity tests revealed that the implanted zinc ions brought a slight increase on cytotoxicity of the tested *** terms of hemocompatibility,the hemolysis of zinc ion implanted pure iron was lower than 2%.However,zinc ions might induce more adhered and activated platelets on the surface of pure ***,zinc ion implantation can be a feasible way to accelerate the degradation rate of pure iron for biodegradable applications.

关键词： biodegradable metals iron zinc ion implantation biocompatibility

来源：

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

Molecular Dynamics Simulation for the Impact of External Electric Fields on CaCl2 Aqueous Solution

引用

Chemical Research in Chinese Universities 2016年第4期32卷 641-646页

作者： han yong ZHU Lilan ZhanG Yuyan School of Electrical Engineering Yanshan University Qinhuangdao 066004 P. R. China

Non-equilibrium molecular dynamics（MD） simulations were performed according to the electronic anti-fouling technology, and some structural parameters and dynamic parameters of CaCl2 aqueous solution were taken as indicators to compare the different effect on the anti-fouling performance by applying different electric fields. The results show that electric fields can effectively decrease the viscosity of CaCl2 aqueous solution and enhance the ionic activity by enlarging the self-diffusion coefficient. In addition, with the same electric field strength, the electrostatic field is more effective at decreasing the viscosity of CaCI2 aqueous solution and increasing the self-diffusion coefficient of water molecules, while the alternating electric field is more effective at increasing the self-diffusion coefficient of Ca2＋. Furthermore, an alternating electric field with different frequencies was applied; the results show that an 800 kHz frequency is most effective to decrease the viscosity, and a 700 kHz frequency is most effective to en- hance the self-diffusion coefficient of water molecule. Otherwise, 400 kHz is most effective to enhance the self-diffusion coefficient of Ca2＋. Additionally, by studying the change of structure parameters, it was concluded that an external electric field can enhance the hydration between Ca2＋ and coordinated water molecules, and the alternating electric field is more effective in this respect.

关键词： Electronic anti-fouling(EAF) Molecular dynamics(MD) simulation Viscosity Self-diffusion coefficient Structure parameter

来源：

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

Advances in DNA Origami Nanopores： Fabrication：Characterization and Applications

引用

Chinese Journal of Chemistry 2018年第9期36卷 875-885页

作者： yong-An Ren han Gao Xiangyuan Ouyang Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education of China Key Laboratory of Modern Separation Science in Shaanxi Province College of Chemistry & Material ScienceNorthwest University Xi'an Shaanxi 710127 China

In recent years, bio-nanopore and solid-state nanopore have been greatly improved for molecule bio-sensing. Whereas, the development of this scientific field seems to have encountered a bottleneck due to their respective limitations. The small pore size of the former impedes the detection of large single molecule, and the latter is difficult to achieve similar accuracy and functional control. DNA origami plays a novel role to bring more opportuni- ties for the development of nanopore technology since it is relatively easy to synthesize and modify. This review mainly focuses on introducing the DNA origami nanopore fabrication methods, characterization and application. Meanwhile, the challenges in the present DNA origami nanopore research are also discussed.

关键词： DNA origami nanopore single molecule detection nanopore fabrication

来源：

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

Comparison of Gross N Transformation Rates in Two Paddy Soils Under Aerobic Condition

引用

Pedosphere 2017年第1期27卷 112-120页

作者： LAN Ting han yong CAI Zucong College of Resources Science and Technology Sichuan Agricultural UniversityChengdu 611130 China State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008 China School of Geography Science Nanjing Normal UniversityNanjing 210097 China

Although to date individual gross N transformations could be quantified by 15N tracing method and models, studies are still limited in paddy soil. An incubation experiment was conducted using topsoil （0-20 cm） and subsoil （20-60 cm） of two paddy soils, alkaline and clay （AC） soil and neutral and silt loam （NSL） soil, to investigate gross N transformation rates. Soil samples were labeled with either 15NhanO3 or NH4SN03, and then incubated at 25 ℃for 168 h at 60% water-holding capacity. The gross N mineralization （recalcitrant and labile organic N mineralization） rates in AC soil were 1.6 to 3.3 times higher than that in NSL soil, and the gross N nitrification （autotrophic and heterotrophic nitrification） rates in AC soil were 2.4 to 4.4 times higher than those in NSL soil. Although gross NO3 consumption （i.e., NO3 immobilization and dissimilatory NO3 reduction to NH＋） rates increased with increasing gross nitrification rates, the measured net nitrification rate in AC soil was approximately 2.0 to 5.1 times higher than that in NSL soil. These showed that high NO3 production capacity of alkaline paddy soil should be a cause for concern because an accumulation of NO3 can increase the risk of NO3 loss through leaching and denitrification.

关键词： leaching immobilization mineralization 15N tracing model nitrification NO3 loss

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Molecular modeling of the inhibitory mechanism of copper(II) on aggregation of amyloidβ-peptide

引用

Science China Chemistry 2005年第6期48卷 580-590页

作者： JIAO yong han Daxiong YANG Pin Institute of Molecular Science Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of EducationShanxi UniversityTaiyuan 030006China

Aggregation of amyloid ?-peptide (A?) into insoluble fibrils is a key pathological event in Alzheimer’s disease (AD). Under certain conditions, Cu(II) exhibits strong inhibitory ef-fect on the Zn(II)-induced aggregation, which occurs significantly even at nearly physiological concentrations of zinc ion in vitro. Cu(II) is considered as a potential factor in the normal brain preventing A? from aggregating. The possible mechanism of the inhibitory effect of Cu(II) is in-vestigated for the first time by molecular modeling method. In the mono-ring mode, the Y10 residue promotes typical quasi-helix conformations of A?. Specially, [Cu-H13(Np)-Y10(OH)] complex forms a local 3.010 helix conformation. In the multi-ring mode, the side chains of Q15 and E11 residues collaborate harmoniously with other chelating ligands producing markedly low energies and quasi-helix conformations. [Cu-3N-Q15(O)-E11(O1)] and [Cu-H13(Np)-Y10(OH)] complex with quasi-helix conformations may prefer soluble forms in solution. In addition, hydro-gen-bond interactions may be the main driving force for A? aggregation. All the results will pro-vide helpful clues for an improved understanding of the role of Cu(II) in the pathogenesis of AD and contribute to the development of an “anti-amyloid” therapeutic strategy.

关键词： copper(II) amyloid β-peptide inhibitory mechanism, Alzheimer’s disease molecular modeling

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

THE EFFECTS OF COD BONE GELATIN ON TRABECULAR MICROSTRUCTURE AND MEChanICAL PROPERTIES OF CANCELLOUS BONE

引用

Acta Mechanica Solida Sinica 2015年第1期28卷 1-10页

作者： Renhan Huang Qiguo Rong Xiaolong han yong Li College of Engineering Peking Universiry China Astronaut Research and Training Center Department of Space Food and Nutrition School of Public Health Peking University

Osteoporosis is a common clinical complication of post-menopausal women and the elderly and can significantly complicate the severity of bone fragility. The purpose of this study is to investigate how cod bone gelatin administration influences trabecular biomechanical properties after ovariectomy. Both biomechanical properties and trabecular microarchitectures were evaluated for cancellous bone samples from female ovariectomized rats, which were either shamoperated or treated with marine peptide （0.75, 1.5, 3.0, 6.0 g/kg body weight） for 90 days. The results have confirmed that cod bone gelatin treatment is effective in the prevention of mechanical property loss by preserving bone mass and trabecular architecture.

关键词： osteoporosis cod bone gelatin trabecular microarchitecture finite element analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：