检索结果-南通市图书馆

High-Throughput UAV Image-Based Method Is More Precise Than Manual Rating of Herbicide Tolerance

Plant Phenomics 2019年第1期1卷 133-141页

作者： Hema S.N.Duddu Eric N.johnson Christian *** Steven J.Shirtliffe Department of Plant Sciences College of Agriculture and BioresourcesUniversity of Saskatchewan51 Campus DriveSaskatoonSKCanada

The traditional visual rating system is labor-intensive,time-consuming,and prone to human *** aerial vehicle(UAV)imagery-based vegetation indices(VI)have potential applications in high-throughput plant *** study objective is to determine if UAV imagery provides accurate and consistent estimations of crop injury from herbicide application and its potential as an alternative to visual *** study was conducted at the Kernen Crop Research Farm,University of Saskatchewan in 2016 and ***(Vicia faba L.)crop tolerance to nine herbicide tank mixtures was evaluated with 2 rates distributed in a randomized complete block design(RCBD)with 4 *** trial was imaged using a multispectral camera with a ground sample distance(GSD)of 1.2 cm,one week after the treatment *** ratings of growth reduction and physiological chlorosis were recorded simultaneously with *** optimized soil-adjusted vegetation index(OSAVI)was calculated from the thresholded *** UAV-based vegetation index(OSAVI)produced more precise results compared to visual ratings for both *** coefficient of variation(CV)of OSAVI was~1%when compared to 18-43%for the visual ***,Tukey’s honestly significance difference(HSD)test yielded a more precise mean separation for the UAV-based vegetation index than visual *** significant correlations between OSAVI and the visual ratings from the study suggest that undesirable variability associated with visual assessments can be minimized with the UAVbased ***-based imagery methods had greater precision than the visual-based ratings for crop herbicide *** methods have the potential to replace visual ratings and aid in screening crops for herbicide tolerance.

关键词： Visual precise replace

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

The Development and Initial Tests of an Atmospheric Model Based on a Vertical Coordinate with a Smooth Transition from Terrain Following to Isentropic Coordinates

引用

Advances in Atmospheric Sciences 1998年第3期15卷 1-17页

作者： DRjohnson and Zhuojian YuanSpace Science and Engineering Center University of wisconsin-Madison 1225 w. Dayton Street Madison,wI 53706, U. S. A Space Science and Engineering Center University of WisconsinAMadison Madison WI

An atmospheric model (η model) is developed by modifying the Uw θ-σ hybrid model. In the η model, the vertical coordinate transforms smoothly from terrain following to isentropic coordinates. The model is developed to capitalize on the inherent advantage of numerical modeling in isentropic coordinates and to eliminate the interface between the sigma planetary boundary layer and isentropic free atmosphere present in the Uw θ-σ model. This formulation provides the potential for the data assimilation and the application of higher order schemes. This paper describes the structure of the η model and presents results from initial numerical experiments. The first experiment tests the capability of the η model for simulating the baroclinic development process. In the 48-hr numerical weather forecast experiment, the η model produces reasonable precipitation and synoptic fields at all levels which are similar to those from the Uw θ-σ model. The second and third experiments test the capability of the η model for conserving 1) the joint distribution of isentropic potential vorticity (IPV) and proxy ozone and 2) equivalent potential temperature under frictionless and isentropic conditions. These experiments show that distributions of IPV and proxy ozone in the pure isentropic domain and the distributions of prognostic and diagnostic equivalent potential temperture in the model domain remain highly correlated to day 10.

关键词： Hybrid model Isentropic study

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

Vegetation fractional coverage change in a typical oasis region in Tarim River watershed based on remote sensing

引用

Journal of Arid Land 2013年第1期5卷 89-101页

作者： Fei ZHANG Tashpolat TIYIP JianLi DING Mamat SAwUT Verner Carl johnson NigaraTASHPOLAT Dongwei GUI College of Resources and Environment Science Xinjiang University Urumqi 830046 China Key Laboratory of Oasis Ecology Xinjiang University Urumqi 830046 China Department of Physical and Environmental Sciences Colorado Mesa University Grand Junction Colorado 81501 USA Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China Cele National Station of Observation & Research for Desert-Grassland Ecosystem in Xinjiang Cele 848300 China

Vegetation fractional coverage （VFC） is an important index to describe and evaluate the ecological system. The vegetation index is widely used to monitor vegetation coverage in the field of remote sensing （RS）. In this paper, the author conducted a case study of the delta oasis of weigan and Kuqa rivers, which is a typical saline area in the Tarim River watershed. The current study was based on the TM/ETM＋ images of 1989, 2001, and 2006, and supported by Geographic Information System （GIS） spatial analysis, vegetation index, and dimidiate pixel model. In addition, VBSl （vegetation, bare soil and shadow indices） suitable for TM/ETM＋ irrlages, constructed with FCD （forest canopy density） model principle and put forward by ITTO （International Tropical Timber Organization）, was used, and it was applied to estimate the VFC. The estimation accuracy was later prow^n to be up to 83.52%. Further, the study analyzed and appraised the changes in vegetation patterns and revealed a pattern of spatial change in the vegetation coverage of the study area by producing the map of VFC levels in the delta oasis. Forest, grassland, and farmland were the three main land-use types with high and extremely-high coverage, and they played an important role in maintaining the vegetation. The forest area determined the changes of the coverage area, whereas the other two land types affected the directions of change. Therefore, planting trees, protecting grasslands, reclaiming farmlands, and controlling unused lands should be included in a long-term program because of their importance in keeping regional vegetation coverage. Finally, the dynamic variation of VFC in the study area was evaluated according to the quantity and spatial distribution rendered by plant cover diigital images to deeply analyze the reason behind the variation.

关键词： vegetation fractional coverage (VFC) VBSI (vegetation, bare soil and shadow indices) dimidiate pixel model delta oasis of weigan and Kuqa rivers

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

Laxton's building price book 2004 V B johnson

Laxton's building price book 2004 V B Johnson

引用

2003年

作者： V B johnson.

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

China's Belt and Road Initiative:Estrangement or Engagement with the United States

China's Belt and Road Initiative:Estrangement or Engagement ...

引用

作者： Joseph Courtland johnson Jr. 华东师范大学

学位级别：硕士

中国的上升对美国很紧张。见状,在亚洲美国想有更重要的影响。如此,美国的转向亚洲,跨太平洋伙伴关系,和新丝绸之路压抑中国。一带一路倡议是中国的响应。这论文把美国的亚洲目标比较中国的。这分论文会查两个国家的目标有合作机会还是... 详细信息

中国的上升对美国很紧张。见状,在亚洲美国想有更重要的影响。如此,美国的转向亚洲,跨太平洋伙伴关系,和新丝绸之路压抑中国。一带一路倡议是中国的响应。这论文把美国的亚洲目标比较中国的。这分论文会查两个国家的目标有合作机会还是他们会有竞争。本文分析了中国的“一带一路”和美国“转向亚洲”的动因。我发现“一带一路”并不与美国在亚洲的目标相冲突。而且,中国提供的替代援助不是西方国家给出的。

关键词：一带一路中美关系地缘政治转向亚洲

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Developmental origins of altered stress resilience: The yin and yang of microglia activation

Developmental origins of altered stress resilience: The yin ...

引用

中国神经科学学会第十二届全国学术会议

作者： Rodney w.johnson Adrienne M.Antonson Laboratory of Integrative Immunology and Behavior Department of Animal SciencesUniversity of Illinois Urbana-Champaign

Epidemiological studies have revealed that prenatal exposure to maternal infection increases the risk of psychiatric disorders like autism and schizophrenia, though the mechanisms remain to be elucidated. One hypothesis suggests that the prenatal epoch represents a sensitive period during which infection programs microglia of the neuroimmune system such that they are more prone to activation later. However, in a maternal immune activation（MIA） swine model we recently reported altered piglet social behaviors postnatally in the absence of abnormal microglia activation. Therefore, if microglia played a role in shaping social behaviors, it likely was due to aberrant activity in the fetal brain during MIA. As microglia play a fundamental role in neurodevelopment by phagocytosing neural progenitor cells and synapses tagged for elimination, untimely stimulation or inhibition of fetal microglia may have long lasting ramifications to behavior. Our most recent studies support this notion as we found transient activation of fetal microglia and reduced phagocytoses during MIA. while microglia activity normalized before birth, the number of neurons in the hippocampus was reduced. Thus, MIA may increase the risk of behavioral disorders by transiently altering fetal microglia activity. This presentation will focus on the role of microglia in the perinatal period when the brain is rapidly developing.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Relationships between vegetation and stomata,and between vegetation and pollen surface soil in Yunnan,Southwest China

引用

Chinese Science Bulletin 2013年第15期58卷 1775-1786页

作者： SHEN HuaDong LI ChunHai wAN Hewen TONG GuoBang LIU JinSong DAN johnson State Key Laboratory of Lake Science and Environment Nanjng Institute of Geography and LimnologyChinese Academy of Sciences University of Chinese Academy of Sciences College of Life Sciences Anhui University Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological Sciences Mathematics and Information Science College Hebei Normal University The Key Laboratory of Calculation and Application of Hebei Province Environmental Science Department of GeographyUniversity of Lethbridge

Surface pollen and stomata of 61 samples collected in a study area ranging from tropical seasonal rainforest to oak forest(Quercus spinosa) in the Yulong Snow Mountain region in Yunnan,China,are used to distinguish vegetation *** results show that tropical seasonal rainforest(and mountain rainforest),south subtropical evergreen broad-leaved forest,and Quercus shrub are distinguished effectively from other vegetation types by analysis of surface *** south subtropical evergreen broad-leaved forest,Pinus kesiya forest and evergreen broadleaf forest are distinguished effectively from other types of vegetation by pollen ***,*** forest is not distinguished from other vegetation types,and ***,*** forest and temperate deciduous conifer mixed forest are not *** over-representation of Pinus pollen is the main reason that these vegetation communities are not distinguished from each *** stomata analysis is an effective tool for identifying and distinguishing different types of coniferous forest,and this method performs well even with a small number of sampling points.

关键词：植被群落中国云南花粉分析中国西南地区南亚热带常绿阔叶林气孔表土热带季节雨林

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

Colloidal Silica Sol Bonded Castables for High Temperature Applications

引用

China's Refractories 2015年第1期24卷 51-56页

作者： Uwe KLIPPEL Jerome SOUDIER johnson LEE Asep wAHYU Calderys France R&D Center Calderys China Co.Ltd. P.T.Indoporlen

A colloidal silica sol bonded product range is introduced by an example targeting high temperature applications in steel making. Placement and setting characteristics are shown. The thermal mechanical properties and resulting advantages are presented as well as the performance enhancement in corrosion resistance. Properties are compared to a common ULCC product. Results of the industrial trial phase are discussed.

关键词： high alumina refractory corrosion by slag reactive impregnation kinetics

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

Spectral reflectance response to nitrogen fertilization in field grown corn

引用

International Journal of Agricultural and Biological Engineering 2018年第4期11卷 118-126页

作者： Chuanqi Xie Ce Yang Alexander Hummel Jr Gregg A johnson Forrest T Izuno Department of Bioproducts and Biosystems Engineering University of MinnesotaSaint PaulMN 55108United States Farm Nutrients Inc. 4949 Hwy 71RembrandtIA 50576United States Department of Agronomy and Plant Genetics University of MinnesotaSaint PaulMN 55108United States Southern Research and Outreach Center University of MinnesotaWasecaMN 56093United States

This study was carried out to analyze the spectral reflectance response of different nitrogen levels for corn *** different nitrogen treatments of 0%,80%,100%and 120%BMP(best management practice)were *** component analysis-loading(PCA-loading)was used to identify the effective *** least squares(PLS)and multiple linear regression(MLR)models were built to predict different nitrogen *** indices(VIs)were calculated and then used to build more prediction *** full and selected wavelengths-based models showed similar prediction *** overall PLS model obtained the coefficient of determination(R^(2))of 0.6535 with a root mean square error(RMSE)of 0.2681 in the prediction *** selected wavelengths for overall MLR model obtained the R^(2) of 0.6735 and RMSE of 0.3457 in the prediction *** results showed that the wavelengths in visible and near infrared region(350-1000 nm)performed better than the two either spectral regions(1001-1350/1425-1800 nm and 2000-2400 nm).For each data set,the wavelengths around 555 nm and 730 nm were identified to be the most important to predict nitrogen *** vogelmann red edge index 2(VOG 2)performed the best among all *** demonstrated that spectral reflectance has the potential to be used for analyzing nitrogen response in corn.

关键词： spectrum effective wavelengths principal component analysis-loading(PCA-loading) prediction vegetation indices(VIs) corn

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

森林土壤中氮的吸持

引用

热带亚热带土壤科学 1993年第3期2卷 175-178页

作者： Dale w.johnson 肖辉林内华达沙漠研究所生物科学中心

本文综述了影响N在施过肥料的和自然的森林生态系统中的吸持的因素。总的来说,文献认为描述土壤中的异养菌、植物和硝化细菌之间的N竞争概念模型需要做些修改。硝化细菌对N的竞争看来此以前所认识的还要强,特别是在N输入不断提高的情况... 详细信息

本文综述了影响N在施过肥料的和自然的森林生态系统中的吸持的因素。总的来说,文献认为描述土壤中的异养菌、植物和硝化细菌之间的N竞争概念模型需要做些修改。硝化细菌对N的竞争看来此以前所认识的还要强,特别是在N输入不断提高的情况下(如在被污染的或反复施肥的立地上),认为异养菌是N的最有效的竞争者的假说,在短期且低N输入的情况下是正确的,但对于长期或高N输入来说就未必正确。在缺N的立地上,树木对土壤中的N的明显“挖掘”,意味着在这种条件下N的最有效的竞争者是树木,而不是异养菌。N与土壤有机质的非生物学反应被认为是施肥之后N固定的主要原因,也是在不施肥的立地上有机质分解期间N的有效竞争者。

关键词：森林土壤氮

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：