Search results for "function"

A soil biodiversity survey coupled with the national soil quality monitoring network?

2021

International audience; Despite its importance for human activities, soil biodiversity remains largely unknown and threatened. Aware of the need for large-scale monitoring, we studied the feasibility to add a soil biodiversity survey (RMBS-Biodiversity) to the already existing French soil quality monitoring network (RMQS). We worked with soil biodiversity experts to couple RMBS-Biodiversity with RMQS i.e. to choose soil taxons and functions, the methodologies and the sampling design. According to the experts, the sampling design of RMQS fits with a soil biodiversitysurvey. We propose sampling protocols for i) bacteria and fungi, ii) protists, iii) nematodes, iv) mesofauna (particularly spri…

A single transient episode of hyperammonemia induces long-lasting alterations in protein kinase A.

2007

A single transient episode of hyperammonemia induces long-lasting alterations in protein kinase A. Am J Physiol Gastrointest Liver Physiol 292: G305-G314,2007; doi:10.1152/ajpgi.00100.2006.-Hepatic encephalopathy in patients with liver disease is associated with poor prognosis. This could be due to the induction by the transient episode of hepatic encephalopathy of long-lasting alterations making patients more susceptible. We show that a single transient episode of hyperammonemia induces long-lasting alterations in signal transduction. The content of the regulatory subunit of the protein kinase dependent on cAMP (PKA-RI) is increased in erythrocytes from cirrhotic patients. This increase is…

Somatoforma veģetatīva disfunkcija farmaceita praksē

2020

Ar terminu “somatoforma veģetatīva disfunkcija” (SVD) tiek apzīmēti ķermeņa funkciju un sajūtu traucējumi, gadījumos, kad objektīvs un medicīniski izskaidrojams šo traucējumu iemesls netiek atrasts. Cilvēki ar SVD izjūt dažādus simptomus, piemēram, trauksmi, nemieru, paaugstinātu uzbudināmību, sāpes, kuņģa-zarnu trakta darbības traucējumus, sirds un asinsvadu sistēmas traucējumus, kas izraisa pastāvīgu uztraukumu un diskomfortu. Šie pacienti pārmērīgi meklē medicīnisko palīdzību un mierinājumu, bet viņiem ir grūti pieņemt ne patoloģiskus rezultātus medicīniskajā izmeklēšanā. SVD ir grūti diagnosticējama un prasa vairāku speciālistu palīdzību, ka arī paša cilvēka izturību un līdzestību. SVD …

Nonparametric intensity estimation in space-time point processes and application to seismological problems

2008

Missing Data in Space-time: Long Gaps Imputation Based On Functional Data Analysis

2017

High dimensional data with spatio-temporal structures are of great interest in many elds of research, but their exhibited complexity leads to practical issues when formulating statistical models. Functional data analysis through smoothing methods is a proper framework for incorporating space-time structures: extending the basic methodology to the multivariate spatio-temporal setting, we refer to Generalized Additive Models for estimating functional data taking the spatial and temporal dependences into account, and to Functional Principal Component Analysis as a classical dimension reduction technique to cope with the high dimensionality and with the number of estimated eects. Since spatial …

Space-Time Forecasting of Seismic Events in Chile

2017

The aim of this work is to study the seismicity in Chile using the ETAS (epidemic type aftershock sequences) space‐time approach. The proposed ETAS model is estimated using a semi‐parametric technique taking into account the parametric and nonparametric components corresponding to the triggered and background seismicity, respectively. The model is then used to predict the temporal and spatial intensity of events for some areas of Chile where recent large earthquakes (with magnitude greater than 8.0 M) occurred.

Detecting clusters in spatially correlated waveforms

2017

Seismic networks often record signals characterized by similar shapes that provide important information according to their geographic positions. We propose an approach to identify homogeneous clusters of seismic waves, combining analysis of waveforms with metadata and spectrogram information. In waveforms clustering, cross-correlation measures between signals may presents some limitations, so we refer to more recent contributes relating data-depth based clustering analysis. The mechanism for alignment is also an important topic of the analysis: warping (or aligning) procedures identify nuisance effects in phase variation, that, if ignored, may result in a possible loss of information and t…

Models and methods for space and space-time interactions in complex point processes with applications on earthquakes

La modélisation de l'information spatio-temporelle

2012

Understanding Urban Fabric with the OH_FET model based on Social Use, Space and Time

2008

The proposed principle for understanding the urban fabric is based on considering the town as a set of complex objects, taking a systemic approach. The town system used to study the urban fabric over large time spans is composed of three sub-systems relating to historical objects from the level of the excavation to that of the former urban space: function (social use), space (location, surface area and morphology) and time (dating, duration and chronology). The historical object is the analytical unit of the space studied. It is the Cartesian product of the three sets, Social use, Space and Time, from which it stems. On the basis of this process, the Historical Object (OH) is broken down in…