|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Model-Based Integrated Methods for Quantitative Estimation of Soil Salinity from Hyperspectral Remote Sensing Data:A Case Study of Selected South African Soils显示文摘Soil salinization is a land degradation process that leads to reduced agricultural yields. This study investigated the method that can best predict electrical conductivity (EC) in dry soils using individual bands, a normalized difference salinity index (NDSI), partial least squares regression (PLSR), and bagging PLSR. Soil spectral reflectance of dried, ground, and sieved soil samples containing varying amounts of EC was measured using an ASD FieldSpec spectrometer in a darkroom. Predictive models were computed using a training dataset. An independent validation dataset was used to validate the models. The results showed that good predictions could be made based on bagging PLSR using first derivative reflectance (validation R2 = 0.85), PLSR using untransformed reflectance (validation R2 = 0.70), NDSI (validation R2 = 0.65), and the untransformed individual band at 2257 nm (validation R2 = 0.60) predictive models. These suggested the potential of mapping soil salinity using airborne and/or satellite hyperspectral data during dry seasons. | Z. E. MASHIMBYE M. A. CHO J. P. NELL W. P. DE CLERCQ A. VAN NIEKERK D. P. TURNER | 2012 | Pedosphere2012，22，5： | 29 |
| 2 | 关注欧盟蛋鸡福利计划显示文摘蛋鸡饲养环境一直是动物福利所关心的一个重大问题。目前蛋鸡的饲养方式是动物生产最集中的形式之一。而公众的广泛争论也催生了能给动物提供更舒适环境的饲养体系以取代传统的笼养方式。欧盟关于禁止蛋鸡笼养的1999/74/EC号指令促进了当前笼养系统的技术革新,不但改良了传统的鸡笼,而且还发展了笼养的替代方式。对饲养在这些新的笼养系统中蛋鸡尤其是商业化生产的鸡场,很有必要就其实际福利状况进行评估。蛋鸡福利计划由欧盟第六框架计划和一些欧盟国家的国家基金提供资助。其目的是评估各种笼养系统中蛋鸡的福利,尤其注重丰富型鸡笼中的福利问题,并负责在欧盟成员国及相关国家中传播蛋鸡福利的相关信息。这项计划关注了蛋鸡病理学、饲养、生理学和行为学方面的内容,还在笼养系统、行为、健康、死亡率以及与蛋鸡福利相关的其它问题上得出一系列的结论,并提出相关的建议。 | H.J.Blokhuis T.Fiks Van Niekerk W.Bessei 陈清 | 2007 | 中国家禽2007，29，24： | 4 |
| 3 | 用热沉淀法从硫酸盐溶液中除铁显示文摘 | Chrisloffel Johannes Van Niekerk 岑立振. | 1987 | 有色冶炼1987，，6： | 2 |
| 4 | Crop type mapping using LiDAR,Sentinel-2 and aerial imagery with machine learning algorithms显示文摘LiDAR data are becoming increasingly available,which has opened up many new applications.One such application is crop type mapping.Accurate crop type maps are critical for monitoring water use,estimating harvests and in precision agriculture.The traditional approach to obtaining maps of cultivated fields is by manually digitizing the fields from satellite or aerial imagery and then assigning crop type labels to each field-often informed by data collected during ground and aerial surveys.However,manual digitizing and labeling is time-consuming,expensive and subject to human error.Automated remote sensing methods is a cost-effective alternative,with machine learning gaining popularity for classifying crop types.This study evaluated the use of LiDAR data,Sentinel-2 imagery,aerial imagery and machine learning for differentiating five crop types in an intensively cultivated area.Different combinations of the three datasets were evaluated along with ten machine learning.The classification results were interpreted by comparing overall accuracies,kappa,standard deviation and f-score.It was found that LiDAR data successfully differentiated between different crop types,with XGBoost providing the highest overall accuracy of 87.8%.Furthermore,the crop type maps produced using the LiDAR data were in general agreement with those obtained by using Sentinel-2 data,with LiDAR obtaining a mean overall accuracy of 84.3%and Sentinel-2 a mean overall accuracy of 83.6%.However,the combination of all three datasets proved to be the most effective at differentiating between the crop types,with RF providing the highest overall accuracy of 94.4%.These findings provide a foundation for selecting the appropriate combination of remotely sensed data sources and machine learning algorithms for operational crop type mapping. | Adriaan Jacobus Prins Adriaan Van Niekerk | 2021 | Geo-Spatial Information Science2021，24，2： | 2 |
| 5 | 鹧鸪属23种鸟类的鸣声结构、鸣叫行为及基于鸣声的分组(英文)显示文摘本文描述了鹧鸪属(Pternistis spp.)23种鸟类的鸣叫特点,比较了占区/求偶鸣叫在种间的差异,并依据鸣叫(主要为占区/求偶鸣叫)特征,对这23种鹧鸪进行了分组。共分析了非洲所有23种鹧鸪的22个种的218段录音、约300句鸣叫,另有一种鹧鸪的鸣叫分析源于文献。结果表明,每种鹧鸪可发出7–11种鸣叫,这些鸣叫可分为3大类:1)占区/求偶鸣叫;2)警戒叫声、雏鸟和亚成鸟索群叫声、觅食叫声等维持群体关系叫声;3)雌雄两性间以及雌鸟与幼鸟间联络鸣叫。Hall(1963)将鹧鸪分为5个单系类群。本文将鹧鸪的鸣叫分为8个组,其中的5个组与Hall(1963)划分的单系类群基本一致。不同种类间占区/求偶鸣叫的差异虽然减少了同域分布的鹧鸪种间的杂交,但由于鹧鸪的遗传距离较小,种间杂交仍不可避免。本研究还基于鸣声确认了哈氏鹧鸪(P.hartlaubi)仍属于鹧鸪属鸟类,尽管其叫声与其它鹧鸪叫声有很大的差异。 | Johann H.VAN NIEKERK | 2013 | Chinese Birds2013，，3： | 2 |
| 6 | Human metapneumovirus genetic variability,South Africa显示文摘 | Abed Y van Niekerk N | 2005 | Emerg Infect Dis2005，11，7： | 1 |
| 7 | Barriers and enablers to the use of measures to prevent pediatric scalding in Cape Town South Africa显示文摘 | Van Niekerk A Menckel E Laflammc L | 2010 | Public Health Nursing2010，27，3： | 1 |
| 8 | Using poka-yoke methods to improve employment potential of intellectually disabled workers显示文摘 | TREURNICHT NF BLANCKENBERG MM VAN NIEKERK HG | 2011 | South African Journal oflndustrial Engineering2011，22，1： | 1 |
| 9 | Using poka-yoke methods to improve employment potential of intellectually disabled workers 显示文摘 | TREURNICHT NF BLANCKENBERG MM VAN NIEKERK HG | 2011 | South African Journal oflndustrial Engineering2011，22，1： | 1 |
| 10 | DNA phylogeny,morphology and pathogenicity of Botryosphaeria species on grapevines 显示文摘 | Van Niekerk J M Crous P W Groenewald J Z | 2004 | Mycologia2004，96，4： | 1 |
| 11 | DNA phylogeny, morphology and pathogenicity of Botryosphaeria species on grapevines显示文摘 | Van Niekerk J M Crous P W Groenewald J Z | 2004 | Mycologia2004，96，4： | 1 |
| 12 | Fragments from the history of insurance law显示文摘 | NIEKERK J P V | 2001 | South Africa Mercantile Law Journal2001，，13： | 1 |
| 13 | A randomized controlled trial of human papillomavirus(HPV) testing for cervical cancerscreening:trial design and preliminary results(HPV FOCAL Trial)显示文摘 | Ogilvie GS van Niekerk DJ Krajden M | 2010 | BMC Cancer2010，10，2： | 1 |
| 14 | True hermaphroditism an analytic review with a report of 3 new cases显示文摘 | van Niekerk W | 1976 | Am J Obstet Gynecol1976，126，： | 1 |
| 15 | Screening of Silver and Cerium Exchanged Zeo- lite Catalysts for the Lean Burn Reduction of NO, with Propene 显示文摘 | SEIJGER G B F NIEKERK P van Kooten KRISHNA K | 2003 | Applied Catalysis B: Environmental2003，40，： | 1 |
| 16 | Primary hrHPV DNA testing in cervical cancer screening:how to manage screen positive women? A POBASCAM trail substudy显示文摘 | Dijkstra MG van Niekerk D Rijkaart DC | 2014 | Cancer Epidemiol Biomarkers Prey2014，23，1： | 1 |
| 17 | Determination of reducing sugars,sucrose,and inulin in chicory root by high-performance liquid chromatograohy显示文摘 | Alistair W Wight Pieter J van Niekerk | 1993 | J Agric Food Chem1993，，31： | 1 |
| 18 | Systematic reappraisal of Coniella and Pilidiella, with specific reference to species occurring on Eucalyptus and Vitis in South Africa显示文摘 | Jan M. Van Niekerk J. Z. ‘Ewald’ Groenewald Gerard J.M. Verkley Paul H. Fourie Michael J. Wingfield Pedro W. Crous | 2004 | Mycological Research2004，，3： | 1 |
| 19 | A Hospital-Based Palliative Care Service for Patients With Advanced Organ Failure in Sub-Saharan Africa Reduces Admissions and Increases Home Death Rates显示文摘 | Taylor DesRosiers Clint Cupido Elizabeth Pitout Lindi van Niekerk Motasim Badri Liz Gwyther Richard Harding | 2013 | Journal of Pain and Symptom Management2013，，： | 1 |
| 20 | Specialist information provision: The agricultural model显示文摘 | Van Niekerk Rona V | 1988 | South African Journal of Lib and information Science1988，56，3： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员