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| Registros recuperados: 127 | |
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| Meysman, F.. |
| Within the natural sciences, it has long been recognized that biological activity can modify the texture, structure and composition of surface sediments. Darwin (1881) already examined the stirring of soils by burrowing earthworms and made detailed observations on how these organisms affect soil processes. A similar phenomenon can be observed in aquatic sediments, which are inhabited by a diverse biological community, supported by the flux of organic matter and oxygen from the overlying water column. Surface sediments of oceans, estuaries, lakes and rivers are highly active biogeochemical environments and an effective way to generate insight in the complexity of the interactions is by means of so-called general early diagenetic models (e.g. Soetaert et al,... |
| Tipo: Info:eu-repo/semantics/doctoralThesis |
Palavras-chave: Chemistry; Ecology; Hydrology; Model; Sediment; Water. |
| Ano: 2001 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=8063 |
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| Morel, A.; Claustre, H.; Antoine, D.; Gentili, B.. |
| The optical properties of Case 1 waters have been empirically related to the chlorophyll concentration, [Chl], historically used as an index of the trophic state and of the abundance of the biological materials. The well-known natural variability around the mean statistical relationships is here examined by comparing the apparent optical properties (spectral downward irradiance attenuation and reflectance) as a function of [Chl] in two Case 1 environments, the Pacific and Mediterranean waters. These oceanic zones apparently represent two extremes of the possible bio-optical variability range around the mean. The systematic deviations, in both directions with respect to the average laws, mainly result from the differing contents in non-algal detrital... |
| Tipo: Text |
Palavras-chave: Light absorption; Algal biomass; Ocean color; Chlorophyll; Sea; Phytoplankton; Model; Coefficients; Algorithms. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00209/32012/30549.pdf |
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| Yu, Yang. |
| Concept of rural elite in China is introduced. And rural elites are classified into governing elite, economic elite, social elite and cultural elite with phenomenon of overlapping among the four types. Definitions of science nationalization and elite politicalization are introduced. Based on the review of previous research results, meaning of elite nationalization is defined: the state guides elites to join in its operation by means of controlling the elites’ occupation, promoting their status, improving their warfare, assimilating their thought and so on, so that elites may serve the political objectives of the state. Predicaments of rural elites are analyzed. Firstly, some rural governing elites and economic elites are high combined, or they use each... |
| Tipo: Thesis or Dissertation |
Palavras-chave: Rural elites in China; Nationalization of elites; Necessity; Model; Labor and Human Capital. |
| Ano: 2009 |
URL: http://purl.umn.edu/54035 |
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| Foskett,J. Kevin; Mak,D.-O. Daniel. |
| The InsP3R Ca2+-release channel has biphasic dependence on cytoplasmic free Ca2+ concentration ([Ca2+]i). InsP3 activates gating primarily by reducing high [Ca2+]i inhibition. To determine whether relieving Ca2+ inhibition is sufficient for activation, we examined single-channels in low [Ca2+]i in the absence of InsP3 by patch clamping isolated Xenopus oocyte nuclei. For both endogenous Xenopus type 1 and recombinant rat type 3 InsP3R channels, spontaneous InsP3-independent activities with low open probability Po (~ 0.03) were observed in [Ca2+]i < 5 nM, whereas none were observed in 25 nM Ca2+. These results establish the half-maximal inhibitory [Ca2+]i in the absence of InsP3 and demonstrate that the channel can be active when all of its... |
| Tipo: Journal article |
Palavras-chave: InsP3 receptor; Calcium release channel; Calcium; Ion channel; Model. |
| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000400004 |
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| Langner,Josana Andreia; Streck,Nereu Augusto; Durigon,Angelica; Silva,Stefanía Dalmolin da; Lago,Isabel; Dalmago,Genei Antonio; Reiniger,Lia Rejane Silveira; Scheffel,Lúcio Gabriel; Poersch,Anderson Haas. |
| ABSTRACT: The objective of this study was to compare the simulations of leaf appearance of landrace and improved maize cultivars using the CSM-CERES-Maize (linear) and the Wang and Engel models (nonlinear). The coefficients of the models were calibrated using a data set of total leaf number collected in the 11/04/2013 sowing date for the landrace varieties ‘Cinquentinha’ and ‘Bico de Ouro’ and the simple hybrid ‘AS 1573PRO’. For the ‘BRS Planalto’ variety, model coefficients were estimated with data from 12/13/2014 sowing date. Evaluation of the models was with independent data sets collected during the growing seasons of 2013/2014 (Experiment 1) and 2014/2015 (Experiment 2) in Santa Maria, RS, Brazil. Total number of leaves for both landrace and improved... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays L.; Vegetative development; Air temperature; Sowing time; Model. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000100201 |
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| Cui, James. |
| The generalized estimating equation (GEE) approach is a widely used statistical method in the analysis of longitudinal data in clinical and epidemiological studies. It is an extension of the generalized linear model (GLM) method to correlated data such that valid standard errors of the parameter estimates can be drawn. Unlike the GLM method, which is based on the maximum likelihood theory for independent observations, the GEE method is based on the quasilikelihood theory and no assumption is made about the distribution of response observations. Therefore, Akaike’s information criterion, a widely used method for model selection in GLM, is not applicable to GEE directly. However, Pan (Biometrics 2001; 57: 120–125) proposed a model-selection method for GEE... |
| Tipo: Article |
Palavras-chave: Qic; Akaike's information criterion; GEE; Likelihood; Model; Quasilikelihood under the independence model criterion; Research Methods/ Statistical Methods. |
| Ano: 2007 |
URL: http://purl.umn.edu/119269 |
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| Li, Yong-xin; Yin, Chun-wu; Hui, Xiao-jian. |
| In the light of the practical situation of logistics distribution of agricultural products, we primarily select transportation factor, economic factor, environment factor, and other factors, to establish evaluation index system of site selection of distribution center of agricultural products. And then we adopt the analytic hierarchy process method to calculate weight of site selection of distribution center of agricultural products. Under the circumstance that the evaluation information is interval number, we use uncertain and multiple attribute decision making method to establish site selection model of distribution center of agricultural products. Finally, taking one city as an example, we discuss the application of this model in site selection of... |
| Tipo: Journal Article |
Palavras-chave: Distribution center of agricultural products; Model; Interval number; China; Agribusiness. |
| Ano: 2011 |
URL: http://purl.umn.edu/113502 |
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| Scheffer, Marten; Wageningen Agricultural University; Marten.Scheffer@wur.nl. |
| Despite the huge scientific progress of the last century, the dynamics of complex systems such as the atmosphere, human societies, and ecosystems remain difficult to understand and predict. Nonetheless, our ability to carve the future depends largely on our insight into the functioning of such complex systems. Complex systems are the focus of considerable mathematical theory. Rather than referring to any particular part of the world, such theory addresses what seems to be another world: a world of strange attractors, catastrophe folds, torus destruction, and homoclinic bifurcations. So disparate is the language and notation in this discipline that it is hard to imagine that it has any thing to do with reality as we know it. Indeed, it deals with a kind of... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Bifurcation; Catastrophe; Chaos; Cycle; Daphnia; Fish; Macrophyte; Model; Multiple stable states; Plankton; Predation; Trophic cascade. |
| Ano: 1999 |
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| Paredes Santaella, Andrés. |
| Se realizaron dos modelos, uno hidrológico y uno dinámico, para simular el comportamiento de la poza La Becerra, en el valle de Cuatro Ciénegas, Coahuila, para identificar el efecto de las extracciones de agua para el riego en la hidrología del humedal El Garabatal. Los modelos se basan en un balance hídrico, el cual está definido por la aplicación del principio de conservación de masas, también conocido como ecuación de la continuidad. Esta establece que, para cualquier volumen arbitrario y durante cualquier período de tiempo, la diferencia entre las entradas y salidas estará condicionada por la variación del volumen de agua almacenada (Sokolov A., 1981). Estos modelos hacen un balance de los volúmenes derramados, el déficit, los volúmenes evaporados, las... |
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Palavras-chave: Modelo; Humedales; Balance; Model; Wetland; Maestría; Hidrociencias. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/484 |
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| Registros recuperados: 127 | |
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