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Coastal zones inventory by high resolution satellites ArchiMer
Loubersac, Lionel.
The development of tools for assessing impacts on coastal environments is a reality. These impact assessments need both baseline and monitoring studies. Satellite remote sensing data would be useful for coastal inventories (baselines) and monitoring if high spatial and temporal resolutions are yield compatible. An overview of the various sensors that could be used is presented. The constraints linked to the different resolutions are exposed. An example based on Spot simulated data and trends are developed.
Tipo: Text Palavras-chave: Milieu littoral; Télédétection; Méthode satellite; Haute résolution; Surveillance; Cartographie; Analyse composante principale; Simulation; Zone côtière; SPOT; Coastal environment; Remote sensing; Satellite methods; High-resolution methods; Monitoring; Cartography; Principal components analysis; Simulation.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/00143/25379/23517.pdf
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Consumer responses to agricultural produce advertising in the O'Higgins Region of Chile Ciencia e Investigación Agraria
Adasme-Berríos,Cristian; Jara-Rojas,Roberto; Ramos-Cabello,Bárbara; Rodríguez,Marcelo; Mora,Marcos.
The main objective of this article was to analyze consumer responses to agricultural produce advertising. A survey was given to a non-probabilistic sample of 400 consumers in Rancagua, the capital city of the O'Higgins Region. A principal components analysis (PCA) was performed to identify the main factors influencing the consumption of agricultural produce and recognized four factors that influence the consumption of agricultural products: influence of advertising, impact of produce advertising, consumption of vegetables, and advertising preference. Additionally, the market segments that respond to agricultural produce advertising were identified using decision-tree methodology (CHAID). The results show that education is the most important segmenting...
Tipo: Journal article Palavras-chave: Agricultural produce; CHAID; Consumer behavior; Principal components analysis.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100003
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Cultivar affects the color change kinetics of sugarcane juice Ciênc. Tecnol. Aliment.
BOMDESPACHO,Laura de Queiroz; SILVA,Bianca Tanahani Ribeiro da; Lapa-GUIMARÃES,Judite; DITCHFIELD,Cynthia; PETRUS,Rodrigo Rodrigues.
Abstract This study evaluated the influence of different Brazilian cultivars (RB867515/C1, SP813250/C2, RB92579/C3 and CTC02/C4) on unprocessed sugarcane juice quality by physicochemical, microbiological and enzymatic analysis. Color parameters were determined during six days at 10 °C. The experimental design was completely randomized with four treatments (cultivars) and three replicates. Significant differences were observed (p ≤ 0.05) among the juice samples from different cultivars. The pH values ranged from 5.09 to 5.25, soluble solids content from 14.13 to 18.60 ºBrix and titratable acidity from 0.035 to 0.120% of citric acid. Counts of mesophiles, psychrotrophs and molds and yeasts varied between 4.8 and 6.2 logCFU mL-1, 3.2 and 4.6 logCFU mL-1 and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Non-alcoholic beverage; Enzymatic browning; Principal components analysis.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612018000500096
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Empirical modelling of the growth of Ruditapes philippinarum by means of non linear regression on factorial coordinates ArchiMer
Goulletquer, Philippe; Bacher, Cedric.
In order to highlight the main factors accounting for the growth of clams in Marennes Oleron Bay, three locations were investigated in 1984-1985. First, factor analysis provided information on fluctuations of the environment. Second, principal components analysis was used to study ecological phenomena. The main axes explained the growth rate, which was included in an allometric model. Its properties were then studied by means of sensitivity analysis.
Tipo: Text Palavras-chave: Sensitivity analysis; Non linear model; Principal components analysis; Ruditapes philippinarum; Trophic relationships; Analyse de sensibilité; Modèle non linéaire; Analyse en composantes principales; Ruditapes philippinarum; Relations trophiques.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/1988/publication-2879.pdf
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External preference map to evaluate the acceptance of light and diet yogurt preparedusingnatural sweeteners Ciência Rural
Carvalho,Daiana Aparecida de; Valente,Gerson de Freitas Silva; Assumpção,Giovana Maria Pereira.
ABSTRACT: Owing to the high demand for healthier foods, the food industry has been marketing diet and light yogurts. The present study aimed to sensorially evaluate yogurts prepared using natural sweeteners through a simple centroid mixture design with three repetitions at the central point using the preference map methodology. Different formulations were processed using stevia, xylitol, and sucrose in delimited proportions based on the sweetness of the sweetener. A team of tasters was recruited to survey the sensory attributes of the formulations using the check-all-that-apply (CATA) methodology. A product acceptance analysis was also conducted in which 50 consumers evaluated the formulations using a 9-point hedonic scale. After assessing the acceptance,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Principal components analysis; Sensory analysis; Fermented milk.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000600753
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Morphological, molecular and FTIR spectroscopic analysis during the differentiation of kidney cells from pluripotent stem cells Biol. Res.
Mata-Miranda,Monica Maribel; Vazquez-Zapien,Gustavo Jesus; Rojas-Lopez,Marlon; Sanchez-Monroy,Virginia; Perez-Ishiwara,David Guillermo; Delgado-Macuil,Raul Jacobo.
Abstract Background Kidney diseases are a global health problem. Currently, over 2 million people require dialysis or transplant which are associated with high morbidity and mortality; therefore, new researches focused on regenerative medicine have been developed, including the use of stem cells. Results In this research, we generate differentiated kidney cells (DKCs) from mouse pluripotent stem cells (mPSCs) analyzing their morphological, genetic, phenotypic, and spectroscopic characteristics along differentiation, highlighting that there are no reports of the use of Fourier transform infrared (FTIR) spectroscopy to characterize the directed differentiation of mPSCs to DKCs. The genetic and protein experiments proved the obtention of DKCs that passed...
Tipo: Journal article Palavras-chave: Pluripotent stem cells; Differentiated kidney cells; Vibrational spectroscopy; Fourier transform infrared; Principal components analysis.
Ano: 2017 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100207
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MULTIVARIATE ANALYSIS OF PEANUT MECHANIZED HARVESTING REA
Noronha,Rafael H. F.; Zerbato,Cristiano; Silva,Rouverson P. da; Ormond,Antonio T. S.; Oliveira,Mailson F. de.
ABSTRACT The peanuts harvesting mechanization is affected by the soil physical characteristics and it may increase the losses due to the production of pods in subsurface. The objective of the experiment was to identify the clusters through multivariate exploratory approaches from similarity in six soil textures (very clayey, clayey, silty clayey loam, clayey loam, sandy loam and sandy) in the state of São Paulo, Brazil, determining the main agronomic variables that most influenced the clustering division to assist the decision-making process in peanuts mechanized harvesting. The data were analyzed by the multivariate exploratory that is performed to simplify the description of a set of interrelated variables, using: yield, maturity, soil and pod moisture...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil textural classes; Arachis hypogaea L.; Principal components analysis.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000200244
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Multivariate study of Nile tilapia byproducts enriched with omega-3 and dried with different methods Ciênc. Tecnol. Aliment.
ZANQUI,Ana Beatriz; SOUZA,Aloisio Henrique Pereira de; GOHARA,Aline Kirie; NISHIYAMA,Márcia Fernandes; RIBEIRO,Ricardo Pereira; SOUZA,Nilson Evelázio de; VISENTAINER,Jesuí Vergílio; GOMES,Sandra Terezinha Marques; MATSUSHITA,Makoto.
Abstract The present work aimed at studying the effect of different drying methods applied to tilapia byproducts (heads, viscera and carcasses) fed with flaxseed, verifying the contents of omega-3 fatty acids. Two diets were given to the tilapia: a control and a flaxseed formulation, over the course of 60 days. After this period, they were slaughtered and their byproducts (heads, viscera and carcasses) were collected. These fish parts were analyzed in natura, lyophilized and oven dried. Byproducts from tilapia fed with flaxseed presented docosapentaenoic, eicopentaenoic and docosahexanoic fatty acids as a result of the enzymatic metabolism of the fish. The byproducts from the oven drying process had lower levels of polyunsaturated fatty acids. In the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fatty acids; Omega-3; Lyophilization; Principal components analysis.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612016000100018
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Semi-quantitative and quantitative analysis of soft drinks using an electronic tongue IPB - Escola Superior Agrária
Dias, L.G.; Peres, António M.; Barcelos, Tânia P.; Morais, Jorge Sá; Machado, Adélio A.S.C..
A potentiometric electronic tongue with 36 cross-sensibility lipo/polymeric membranes was built and applied for semi-quantitative and quantitative analysis of non-alcoholic beverages. A total of 16 commercial fruit juices (e.g., orange, pineapple, mango and peach) from five different brands were studied. In the semi-quantitative approach, the signal profiles recorded by the device were used together with a stepwise linear discriminant analysis to differentiate four beverage groups with different fruit juice contents: >30%, 14–30%, 6–10% and <4%. The model, with two discriminant functions based on the signals of only four polymeric membranes, explained 99% of the total variability of experimental data and was able to classify the studied samples into...
Tipo: Article Palavras-chave: Electronic tongue; Soft drinks; Fruit juice; Fructose; Glucose; Principal components analysis.
Ano: 2011 URL: http://hdl.handle.net/10198/6407
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Structure and dynamics of the community of periphytic algae in a subtropical reservoir (state of São Paulo, Brazil) Acta Botanica
Taniwaki,Ricardo Hideo; Borghi,Tatiana Cintra; Magrin,Albano Geraldo Emílio; Calijuri,Maria do Carmo; Bottino,Flávia; Moschini-Carlos,Viviane.
Much remains to be learned about biological diversity, which constitutes a valuable natural resource. Due to the pressure that human activity has put on natural resources, biodiversity has been reduced, often unbeknownst to those responsible for that activity. Therefore, we aimed to perform a quantitative and qualitative analysis of periphytic algae in the Itupararanga reservoir, correlating the results with the physical and chemical characteristics of the water, as well as with climatic conditions. To that end, five samples were collected at four sampling stations in the Itupararanga reservoir during the year 2010. Aquatic macrophytes were collected with a 156-cm² frame, and the periphytic algae were scraped free of the macrophytes with a brush. Samples...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Periphyton; Macrophytes; Water quality; Detrended correspondence analysis; Principal components analysis.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000300013
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The Measurement of the Energy Intensity of Manufacturing Industries: A Principal Components Analysis AgEcon
Bernard, Jean-Thomas; Cote, Bruno.
Energy intensity is the ratio of energy use to output. Most industries deal with several energy sources and outputs. This leads to the usual difficulties of aggregating heterogeneous inputs and outputs. We apply principal components analysis to assess the information derived from six energy intensity indicators. We use two measures of total energy use (thermal and economic) and three measures of industry output (value added, value of production, and value of shipments). The data comes from manufacturing industries in Quebec, Ontario, Alberta, and British Columbia from 1976 to 1996. We find that the variation of the six energy intensity indicators that is accounted for by the first principal component is quite large. However, depending on how variables are...
Tipo: Working or Discussion Paper Palavras-chave: Energy intensity; Aggregation; Principal components analysis; Resource /Energy Economics and Policy; Q40; C43; L60.
Ano: 2002 URL: http://purl.umn.edu/10544
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Use of otolith-shape analysis for stock discrimination of Boops boops along the Algerian coast (southwestern Mediterranean Sea) ArchiMer
Ider, D.; Ramdane, Z.; Mahe, Kelig; Dufour, Jean-louis; Bacha, M.; Amara, R..
Otolith-shape analysis was examined to determine its utility for biological stock identification of the bogue Boops boops along the Algerian coast of the Mediterranean Sea. The outlines of 179 sagittal otolith pairs from fish collected at three locations (Oran, Bejaia and Annaba) between 2013 and 2016 were digitised and analysed for shape variation by elliptical Fourier analysis. Potential confounding sources of variation (fish length, age and sex, and left or right otolith position) were examined and accounted for in the analyses before interpretation of spatial differences in distribution of the stock. Redundancy analysis showed a significant difference between the left and right otoliths. No difference was correlated with sex and age, but fish length...
Tipo: Text Palavras-chave: Biological stocks; Elliptical Fourier analysis; Image analysis; Linear discriminant analysis; Marine fish; Principal components analysis; Sex differences.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00409/52075/52855.pdf
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Using panel data to estimate the effect of rainfall shocks on smallholders food security and vulnerability in rural Ethiopia AgEcon
Demeke, Abera Birhanu; Zeller, Manfred.
Ethiopia's agriculture is predominantly rainfed and hence any irregularity in weather conditions has adverse welfare implications. Using panel data, this paper analyzes the effect of rainfall shocks on Ethiopian rural households' food security and vulnerability over time while controlling for a range of other factors. To this end, we generated a time-variant household food security index which is developed by principal components analysis. Based on the scores of the index, households were classified into relative food security groups and their socioeconomic differences were assessed. The exploratory results show that compared to the less secured households, the more secured ones have male and literate household heads, tend to have a greater number of...
Tipo: Working or Discussion Paper Palavras-chave: Food security; Principal components analysis; Rainfall; Panel data; Ethiopia; Food Security and Poverty; Research Methods/ Statistical Methods; Q18; C13.
Ano: 2009 URL: http://purl.umn.edu/57994
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Water quality index in two land use situations in the Mantiqueira Range Ciência e Agrotecnologia
Pinto,Leandro Campos; Mello,Carlos Rogério de; Ferreira,Daniel Furtado; Ávila,Léo Fernandes.
The use of a large number of water quality indicators increases the costs of streamflow monitoring throughout the time. Principal Component Analysis (PCA) can be considered a promised tool for water resources management, allowing a reduction in the dimensionality of the data and facilitating their analyses. This study aimed to obtain a water quality index (WQI) to characterize the Mantiqueira Range region. Water quality indicators from a sub-basin entirely occupied by Atlantic Forest and from another predominantly occupied by pasture were normalized and used to compose the WQI. The normalized values were submitted to a PCA evaluation and the WQI was then calculated. The Indicators with greatest weight, according to the PCA, were total coliform, nitrate,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic Forest; Springs; Environmental indicators; Principal components analysis.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000400007
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芋葉大小與形狀之生長型式量化分析及季節性變異 Taiwan Agricultural Research Institute
呂秀英; 魏夢麗; 呂椿棠; 陳烈夫; Hsiu-Ying Lu; Meng-Li Wei; Chun-Tang Lu; Lit-Fu Chan.
[[abstract]]確實掌握芋葉在生長過程中的動態變化,可預測芋的球莖產量生產。葉片之生長發育受到外界環境影響甚鉅;而葉片表面伸展速率的不同,不但造成葉片大小之變化,其形狀也可能有所差異。本研究主要目的在探討本省芋作物在不同葉位的葉片大小與形狀在生長過程中的變化,及其在不同期作栽培下受氣候因素之影響差異。試驗材料為本省地方品種檳榔心芋及其選育品種「高雄一號」,在農業試驗所進行兩年兩期作之栽培試驗,在水芋的全生育期間以非破壞取樣之方式,將所有葉片自初生展開日起依植株生長發育之速率每隔2~4天,利用影像處理系統數位相機予以照相存檔,直至枯萎老化為止,然後在電腦上進行葉片大小及形狀的數量化處理,收穫時則調查植株各部位鮮、乾重。結果得知,芋葉特徵變異可以兩個主成份來適當描述:第一主成份包含面積和所有長寬度量之與葉片大小有關的性狀,第二主成份則由6個指標綜合構成芋葉形狀。決定了葉裂凹點、葉柄銜接點、兩葉基尖端各至葉尖的相對位置,和兩葉基弧長的轉折點,再加上葉裂角度,應該足以描述及掌握芋葉的形狀特徵。芋葉在初生展開時顯得較狹長、葉裂較深、葉裂角度較小,但隨後葉形便趨於一致。芋葉的兩個葉基並不對稱,高雄一號的右葉基稍大於左葉基,而檳榔心芋則是左大於右。由於兩期作間生長階段氣候變化不同,一月種植期在地上部生長旺盛期的高溫強日照,葉片伸展較快,此有利於收穫時之球莖產量;而七月種植期在地上部生長旺盛期逢低溫寡日照,葉片伸展較慢,故產量較低。葉裂角度、葉裂凹點至葉柄銜接點之長對最大葉長之比例的生長型式受氣候差異之影響在不同期作間有明顯差異。高雄一號在一月種植期的葉裂凹點至葉柄銜接點之長度的延伸較七月種植期及檳榔心芋為快,故造成葉面積上的優勢,致球莖產量提高。
Palavras-chave: 芋 葉片大小 葉形 主成份分析 影像處理系統 氣象因素 Taro; Leaf size; Leaf shape; Principal components analysis; Image processing system; Climatic factor [[classification]]6.
Ano: 2002
Registros recuperados: 15
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