检索结果-南通市图书馆

Detecting Sorghum Plant and Head Features from Multispectral UAV Imagery

在线全文

学校读者我要写书评

暂无评论

Plant Phenomics 2021年第1期3卷 337-350页

作者： Yan Zhao Bangyou Zheng.scott CChapman Kenneth Laws Barbara george-Jaeggli graeme LHammer David RJordan Andries B.Potgieter The University of Queensland Queensland Alliance for Agriculture and Food InnovationCentre for Crop ScienceGattonQueensland 4343Australia CSIRO Agriculture and Food St.LuciaQueensland 4072Australia The University of Queensland School of Agriculture and Food SciencesSt.LuciaQueensland 4072Australia Department of Agriculture and Fisheries Agri-Science QueenslandWarwickQueensland 4370Australia

In plant breeding,unmanned aerial vehicles(UAVs)carrying multispectral cameras have demonstrated increasing utility for high-throughput phenotyping(HTP)to aid the interpretation of genotype and environment effects on morphological,biochemical,and physiological traits.A key constraint remains the reduced resolution and quality extracted from“stitched”mosaics generated from UAV missions across large *** can be addressed by generating high-quality reflectance data from a single nadir image per *** this study,a pipeline was developed to derive reflectance data from raw multispectral UAV images that preserve the original high spatial and spectral resolutions and to use these for phenotyping *** steps involved(i)imagery calibration,(ii)spectral band alignment,(iii)backward calculation,(iv)plot segmentation,and(v)*** step was designed and optimised to estimate the number of plants and count sorghum heads within each breeding *** a derived nadir image of each plot,the coefficients of determination were 0.90 and 0.86 for estimates of the number of sorghum plants and heads,***,the reflectance information acquired from the different spectral bands showed appreciably high discriminative ability for sorghum head colours(i.e.,red and white).Deployment of this pipeline allowed accurate segmentation of crop organs at the canopy level across many diverse field plots with minimal training needed from machine learning approaches.

关键词： breeding backward Plant

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

HORT

计算机光盘软件与应用（COMPUTER ARTS数码艺术） 2006年第1期 32-37页

作者： graeme Aymer Rob scott（摄影）

十一年前，Eike Koenig爱上了唱片标签设计。而如今，graeme Aymer却发现更多的是Hort的创意融合。

关键词：

Estimating Photosynthetic Attributes from High-Throughput Canopy Hyperspectral Sensing in Sorghum

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Phenomics 2022年第1期4卷 324-341页

作者： Xiaoyu Zhi Sean Reynolds Massey-Reed Alex Wu Andries Potgieter Andrew Borrell Colleen Hunt David Jordan Yan Zhao scott Chapman graeme Hammer Barbara george-Jaeggli The University of Queensland Queensland Alliance for Agriculture and Food Innovation(QAAFI)Hermitage Research FacilityWarwickQLDAustralia The University of Queensland Queensland Alliance for Agriculture and Food Innovation(QAAFI)St LuciaQLDAustralia The University of Queensland Queensland Alliance for Agriculture and Food Innovation(QAAFI)GattonQLDAustralia Agri-Science Queensland Department of Agriculture and Fisheries(DAF)Hermitage Research FacilityWarwickQLDAustralia School of Agriculture and Food Sciences The University of QueenslandGattonQLDAustralia

Sorghum,a genetically diverse C_(4) cereal,is an ideal model to study natural variation in photosynthetic *** leaf nitrogen(SLN)and leaf mass per leaf area(LMA),as well as,maximal rates of Rubisco carboxylation(V cmax),phosphoenolpyruvate(PEP)carboxylation(V pmax),and electron transport(J max),quantified using a C_(4) photosynthesis model,were evaluated in two field-grown training sets(n=169 plots including 124 genotypes)in 2019 and 2020.

关键词： capacity maximal Sorghum

Phytochemical analysis and anti-oxidant activities of Albuca bracteata *** Albuca setosa Jacq bulb extracts used for the management of diabetes in the Eastern Cape,South Africa

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2017年第6期7卷 577-584页

作者： Samuel Odeyemi Anthony Afolayan graeme Bradley Department of Biochemistry and Microbiology University of Fort Hare MPED Research Niche Area Department of BotanyUniversity of Fort Hare

Objective:The bulb of Albuca bracteata Jacq.,and Albuca setosa commonly used in Eastern Cape Province of South Africa for the treatment of several types of disease conditions including diabetes,was investigated for their phytochemical contents and antioxidant ***:The antioxidant activity was determined by evaluating the effect of various solvent extracts(acetone,methanol,ethanol and water) on 2,2 – diphenyl-2-picrylhydrazyl(DPPH) scavenging activity,2,20– azino-bis(3-ethylbenzthiazoline-6-sulfonic acid diammonium salt(ABTS),ferric reducing power,hydrogen peroxide and nitric oxide scavenging activity while the various extracts were also analysed for phytochemical their ***:The results obtained indicate that polyphenols,proanthocyanidins,saponins and alkaloids are present in higher *** composition of phenols(117 mg/g),flavonols(26.28 mg/g),proanthocyanidins(84.85 mg/g) and flavonoids(5.36 mg/g) were significantly higher in the acetone extract while saponin and alkaloids contents were higher in the aqueous *** studies of the extracts for nitric oxide,hydrogen peroxide,ABTS and DPPH showed high antioxidant potential in a concentration-dependent manner that was not significantly different from Vitamin C,BHT and Rutin used as standard *** methanol extract showed higher ferric reducing potential compared to the aqueous extract but was significantly different from Vitamin C,BHT and ***:This implies that the bulb of Albuca bracteata may serve as a natural source of antioxidants,which together with the numerous phytochemicals present,could account for its folkloric use as a medicinal plant.

关键词： Phytochemicals Antioxidants Ornitogalum longibrateum Albuca bracteata Diabetes Albuca setosa

Rates and processes affecting As speciation and mobility in lake sediments during aging

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2018年第4期30卷 338-347页

作者： Alan Lock Dirk Wallschlager Nelson Belzile graeme Spiers Celine gueguen Environmental and Life Sciences graduate Program Trent University School of the Environment Department of Chemistry and Water Quality CentreTrent University Department of Chemistry Laurentian University School of the Environment Departments of Earth Sciences and BiologyLaurentian University School of the Environment and Chemistry Department Trent University

Sediments from an arsenic（As） contaminated groundwater vent site were used to investigate As（ Ⅲ） binding, transformation and redistribution in native and iron oxide amended lake sediments using aging spiked batch reactions and a sequential extraction procedure that maintains As（V） and As（ Ⅲ） speciation. In the native sediments, fractionation analysis revealed that 10% of the spiked As（ Ⅲ） remained intact after a 32-day aging experiment and was predominantly adsorbed to the strongly sorbed（NH4H2PO4 extractable） and amorphous Fe oxide bound（H3PO4 extractable） fractions. Kinetic modelling of the experimental results allowed identifying the dominant reaction path for depletion of dissolved As（ Ⅲ） to As（ Ⅲ）absorbed on to the solid phase, followed by oxidation in the solid phase. Arsenite was initially adsorbed primarily to the easily exchangeable fraction（（NH4）2SO4 extractable）, then rapidly transformed into As（V） and redistributed to the strongly sorbed and amorphous Fe oxide bound fractions. Oxidation of As（ Ⅲ） in recalcitrant fractions was less efficient. The iron oxide amendments illustrated the controls that iron oxides can have on As（ Ⅲ） binding and transformation rates. In goethite amended samples As（ Ⅲ） oxidation was faster and primarily occurred in the strongly sorbed and amorphous Fe oxide bound fractions. In these samples,19.3 μg Mn was redistributed（compared to the native sediment） from the easily exchangeable and crystalline Fe oxide bound fractions to the strongly sorbed and amorphous Fe oxide bound fractions, indicating that goethite may act as a catalyst for Mn（Ⅱ） oxidation, thereby producing sorbed Mn（ Ⅲ/Ⅳ ）, which then appears to be involved in rapidly oxidizing As（ Ⅲ）.

关键词： Arsenite Oxidation Fractionation Redistribution Modelling

Soil carbon availability affects nitrogen transformation under irrigated lucerne

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2021年第6期31卷 977-980页

作者： Adriano S.NASCENTE Jonathan NUNEZ scott L.gRAHAM gabriel *** John E.HUNT graeme N.D.ROgERS David WHITEHEAD Manaaki Whenua-Landcare Research P.O.Box 69040Lincoln 7640(New Zealand) Embrapa Arroz e Feijao Highway GO-462Km 12P.O.Box 179Santo Antonio de Goias 75375-000(Brazil) Wageningen University&Research Department of Environmental SciencesP.O.Box 47Wageningen 6700AA(The Netherlands)

Dear Editor,Approximately 55% of the agricultural land in New Zealand is grazed grassland to support the expanding dairy and meat *** management practices such as irrigation,nitrogen(N)fertiliser application,and of fo... 详细信息

关键词： grassland expanding transformation

Property transformation under specification change

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2011年第1期5卷 1-13页

作者： Zheng Fu (1) zhengfu@itee.uq.edu.au graeme Smith (1) 1. School of Information Technology and Electrical Engineering The University of Queensland QLD 4072 Australia

Formal specifications of software systems need to evolve in many ways during system development. Not only are changes required to refine the specification toward an implementation, they are also required in response to changes in requirements, or to incorporate different aspects of the system, e.g., fault tolerance or timing, initially ignored in order to simplify reasoning. This paper presents an approach for evolving Z specifications by the step-wise application of a number of simple rules. These rules not only document the evolution of the specification, but also make precise how properties of the system evolve with the specification. Hence, reasoning about these properties performed on the original specification need not be repeated on the new specification.

关键词： formal methods Z refinement temporallogic system property

Phosphogypsum stabilization of bauxite residue:Conversion of its alkaline characteristics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2019年第3期31卷 1-10页

作者： Shengguo Xue Meng Li Jun Jiang graeme J.Millar Chuxuan Li Xiangfeng Kong School of Metallurgy and Environment Central South University Institute for Future Environments Science and Engineering Faculty Queensland University of Technology

Reduction of the high alkalinity of bauxite residue is a key problem to solve to make it suitable for plant growth and comprehensive utilization. In this study, phosphogypsum, a waste product from the phosphate fertilizer industry, was used to drive the alkaline transformation of the bauxite residue. Under optimal water washing conditions(liquid/solid ratio of 2 mL/g, 30°C, 24 hr), the impact of quantity added, reaction time and reaction mechanism during phosphogypsum application were investigated. Phosphogypsum addition effectively lowered p H levels and reduced the soluble alkalinity by 92.2%. It was found that the concentration of soluble Na and Ca ions in the supernatant increased gradually, whilst the exchangeable Na+and Ca^(2+)in solid phase changed 112 mg/kg and 259 mg/kg, respectively. Ca^(2+)became the dominant element in the solid phase(phosphogypsum addition of 2%, liquid/solid ratio of 2 mL/g, 30°C, 12 hr). X-ray diffraction data indicated that cancrinite and hydrogarnet were the primary alkaline minerals. SEM images suggested that phosphogypsum could promote the formation of stable macroaggregates, whilst the content of Ca^(2+)increased from 5.6% to 18.2% and Na reduced from 6.8% to 2.4%. Treatment with phosphogypsum could significantly promote the transformation of alkalinity cations by neutralization, precipitation and replacement *** research provided a feasible method to promote soil formation of bauxite residue by phosphogypsum amendment.

关键词： Bauxite residue Phosphogypsum Alkaline ions Alkaline transformation Soil formation

genomics of plant speciation

在线全文

学校读者我要写书评

暂无评论

Plant Communications 2023年第5期4卷 112-133页

作者： Dan g.Bock Zhe Cai Cassandra Elphinstone Eric gonza lez-Segovia Kaede Hirabayashi Kaichi Huang graeme L.Keais Amy Kim gregory L.Owens Loren H.Rieseberg Department of Botany and Biodiversity Research Centre University of British ColumbiaVancouverBCCanada Department of Biology University of VictoriaVictoriaBCCanada

Studies of plants have been instrumental for revealing how new species *** several decades,botanical research has complemented and,in some cases,challenged concepts on speciation developed via the study of other organisms while also revealing additional ways in which species can ***,the ability to sequence genomes at an unprecedented pace and scale has allowed biologists to settle decades-long debates and tackle other emerging challenges in speciation ***,we review these recent genome-enabled developments in plant *** discuss complications related to identification of reproductive isolation(RI)loci using analyses of the landscape of genomic divergence and highlight the important role that structural variants have in speciation,as increasingly revealed by new sequencing ***,we review how genomics has advanced what we know of some routes to new species formation,like hybridization or whole-genome duplication,while casting doubt on others,like population bottlenecks and genetic *** genomics can fast-track identification of genes and mutations that confer RI,we emphasize that follow-up molecular and field experiments remain ***,genomics has clarified the outsized role of ancient variants rather than new mutations,particularly early during *** conclude by highlighting promising avenues of future *** include expanding what we know so far about the role of epigenetic and structural changes during speciation,broadening the scope and taxonomic breadth of plant speciation genomics studies,and synthesizing information from extensive genomic data that have already been generated by the plant speciation community.

关键词： genomic islands of speciation structural variation hybrid speciation polyploid speciation reproductive isolation standing genetic variation