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Can Remotely Sensed Meteorological Data Significantly Contribute to Reduce Costs of Tsetse Surveys?
Hendrickx, Guy;Napala, Ayitou;Rogers, David;Bastiaensen, Patrick;Slingenbergh, Jan;
Memórias do Instituto Oswaldo Cruz , 1999, DOI: 10.1590/S0074-02761999000200028
Abstract: a 0.125 degree raster or grid-based geographic information system with data on tsetse, trypanosomosis, animal production, agriculture and land use has recently been developed in togo. this paper addresses the problem of generating tsetse distribution and abundance maps from remotely sensed data, using a restricted amount of field data. a discriminant analysis model is tested using contemporary tsetse data and remotely sensed, low resolution data acquired from the national oceanographic and atmospheric administration and meteosat platforms. a split sample technique is adopted where a randomly selected part of the field measured data (training set) serves to predict the other part (predicted set). the obtained results are then compared with field measured data per corresponding grid-square. depending on the size of the training set the percentage of concording predictions varies from 80 to 95 for distribution figures and from 63 to 74 for abundance. these results confirm the potential of satellite data application and multivariate analysis for the prediction, not only of the tsetse distribution, but more importantly of their abundance. this opens up new avenues because satellite predictions and field data may be combined to strengthen or substitute one another and thus reduce costs of field surveys.
Can Remotely Sensed Meteorological Data Significantly Contribute to Reduce Costs of Tsetse Surveys?
Hendrickx Guy,Napala Ayitou,Rogers David,Bastiaensen Patrick
Memórias do Instituto Oswaldo Cruz , 1999,
Abstract: A 0.125 degree raster or grid-based Geographic Information System with data on tsetse, trypanosomosis, animal production, agriculture and land use has recently been developed in Togo. This paper addresses the problem of generating tsetse distribution and abundance maps from remotely sensed data, using a restricted amount of field data. A discriminant analysis model is tested using contemporary tsetse data and remotely sensed, low resolution data acquired from the National Oceanographic and Atmospheric Administration and Meteosat platforms. A split sample technique is adopted where a randomly selected part of the field measured data (training set) serves to predict the other part (predicted set). The obtained results are then compared with field measured data per corresponding grid-square. Depending on the size of the training set the percentage of concording predictions varies from 80 to 95 for distribution figures and from 63 to 74 for abundance. These results confirm the potential of satellite data application and multivariate analysis for the prediction, not only of the tsetse distribution, but more importantly of their abundance. This opens up new avenues because satellite predictions and field data may be combined to strengthen or substitute one another and thus reduce costs of field surveys.
A Bayesian Geostatistical Moran Curve Model for Estimating Net Changes of Tsetse Populations in Zambia
Luigi Sedda, Cornelius Mweempwa, Els Ducheyne, Claudia De Pus, Guy Hendrickx, David J. Rogers
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0096002
Abstract: For the first time a Bayesian geostatistical version of the Moran Curve, a logarithmic form of the Ricker stock recruitment curve, is proposed that is able to give an estimate of net change in population demographic rates considering components such as fertility and density dependent and density independent mortalities. The method is applied to spatio-temporally referenced count data of tsetse flies obtained from fly-rounds. The model is a linear regression with three components: population rate of change estimated from the Moran curve, an explicit spatio-temporal covariance, and the observation error optimised within a Bayesian framework. The model was applied to the three main climate seasons of Zambia (rainy – January to April, cold-dry – May to August, and hot-dry – September to December) taking into account land surface temperature and (seasonally changing) cattle distribution. The model shows a maximum positive net change during the hot-dry season and a minimum between the rainy and cold-dry seasons. Density independent losses are correlated positively with day-time land surface temperature and negatively with night-time land surface temperature and cattle distribution. The inclusion of density dependent mortality increases considerably the goodness of fit of the model. Cross validation with an independent dataset taken from the same area resulted in a very accurate estimate of tsetse catches. In general, the overall framework provides an important tool for vector control and eradication by identifying vector population concentrations and local vector demographic rates. It can also be applied to the case of sustainable harvesting of natural populations.
Internal quality standards for homeopathic medicinal preparations. Par metros internos de calidad para preparaciones medicamentosas homeop ticas. Par metros internos de qualidade para prepara § μes medicamentosas homeop ticas.
Jack Hendrickx
International Journal of High Dilution Research , 2007,
Abstract:
Orogenesis: Cause of Sedimentary Formations  [PDF]
Guy Guy Berthault
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.32B005
Abstract:

Experiments on stratification discussed here have revealed the mechanical nature of lamination as well as the role of turbulent current as agent of stratification. They challenge Steno’s principle that superposed strata are successive sedimentary layers. They show that relative chronology should not be referred to as “stages” but as “sequences” of series. The rock formation studied by Lalomov shows that the duration of sedimentation could be considerably shorter than indicated by the Geological Time Scale. The latter scale corresponds to large marine transgressions and regressions that can result from the shift of polar axis following such major orogeneses as the Caledonian, Hercynian and Alpine.

New distribution, size and habitats records of decapod crustaceans from the eastern tropical Pacific
Michel E. Hendrickx
Revista de Biología Tropical , 2001,
Abstract:
Order preservation in a generalized version of Krause's opinion dynamics model
Julien M. Hendrickx
Physics , 2007, DOI: 10.1016/j.physa.2008.05.018
Abstract: Krause's model of opinion dynamics has recently been the object of several studies, partly because it is one of the simplest multi-agent systems involving position-dependent changing topologies. In this model, agents have an opinion represented by a real number and they update it by averaging those agent opinions distant from their opinion by less than a certain interaction radius. Some results obtained on this model rely on the fact that the opinion orders remain unchanged under iteration, a property that is consistent with the intuition in models with simultaneous updating on a fully connected communication topology. Several variations of this model have been proposed. We show that some natural variations are not order preserving and therefore cause potential problems with the theoretical analysis and the consistence with the intuition. We consider a generic version of Krause's model parameterized by an influence function that encapsulates most of the variations proposed in the literature. We then derive a necessary and sufficient condition on this function for the opinion order to be preserved.
On Bifurcation from Infinity and Multipoint Boundary Value Problems  [PDF]
Guy Degla
Advances in Pure Mathematics (APM) , 2014, DOI: 10.4236/apm.2014.44018
Abstract:

We generalize a result on bifurcation from infinity of high order ordinary differential equations with multi-point boundary conditions. Our abstract setting represents a variant of Nonlinear Krein-Ruthman theorems. Furthermore, an analysis of this abstract setting raises an open question motivated by some misunderstanding and inconclusive proofs about the simplicity of principal eigenvalues in some articles in the literature.

A Remark on the Uniform Convergence of Some Sequences of Functions  [PDF]
Guy Degla
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.59048
Abstract: We stress a basic criterion that shows in a simple way how a sequence of real-valued functions can converge uniformly when it is more or less evident that the sequence converges uniformly away from a finite number of points of the closure of its domain. For functions of a real variable, unlike in most classical textbooks our criterion avoids the search of extrema (by differential calculus) of their general term.
The Case for the Recognition of Krav-Maga as Part of the Intangible Cultural Heritage of Israel  [PDF]
Guy Mor
Open Journal of Social Sciences (JSS) , 2019, DOI: 10.4236/jss.2019.74023
Abstract: Krav-Maga (“contact combat”) has attracted increasing attention, both in Israel and abroad, as a civilian combat discipline, a martial art and an effective self-defense system used by the Israel Defense Forces (IDF). This paper explores the interactions between the development of Krav-Maga and the history, culture and heritage of the Jewish population of Israel. Using qualitative research methods, it is demonstrated that the evolution of Krav-Maga is intertwined with ideological changes and historical events that affected the Jewish people in the late 19th and early 20th centuries, and with the cultural history and identity of Jewish immigrants to Israel in the mid 20th century. We argue that Krav-Maga meets the criteria set out in UNESCO’s definition of intangible cultural heritage and that it should be included in the Representative List of the Intangible Cultural Heritage of Israel.
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