Search results for "model."
showing 10 items of 23664 documents
Properties of zeros of solutions to third order nonlinear differential equations
2013
We investigate the behavior of zeros of solutions to the certain type of third order nonlinear differential equations. We show that the behavior of zeros may be rather different and depend on the nature of nonlinearity in the equation. Main results in the paper are illustrated with a number of examples.
Statistical Approximation of Fourier Transform-IR Spectroscopy Data for Zinc White Pigment from Twentieth-Century Russian Paintings
2017
We present a statistical model for approximation of experimental Fourier transform-IR spectroscopy (FTIR) data for paint samples from paintings of different ages. The model utilizes random variations in some parameters (initial ageing rate, degree of change in ageing rate and time at which the change occurs). We determine the parameters characterizing variation in the paint composition and the storage conditions for the paintings. The numerical calculation is qualitatively consistent with the experimental data. In the proposed model, changes in the initial composition of the paint and the storage conditions make about the same contribution to the experimentally observed scatter in the data …
Inferring phytoplankton community composition with a fatty acid mixing model
2015
Abstract. The taxon specificity of fatty acid composition in algal classes suggests that fatty acids could be used as chemotaxonomic markers for phytoplankton composition. The applicability of phospholipid-derived fatty acids as chemotaxonomic markers for phytoplankton composition was evaluated by using a Bayesian fatty acid-based mixing model. Fatty acid profiles from monocultures of chlorophytes, cyanobacteria, diatoms, euglenoids, dinoflagellates, raphidophyte, cryptophytes and chrysophytes were used as a reference library to infer phytoplankton community composition in five moderately humic, large boreal lakes in three different seasons (spring, summer and fall). The phytoplankton commu…
Metody analizy zrównoważoności rozwoju wielkich społeczno-terytorialnych systemów – modelowanie semantyczne procesów w sektorze transportu
2016
Artykuł zawiera opis metodologii i ilustracje metod oceny stanów zrównoważoności i identyfikacji zjawisk oraz okresów anomalnej dynamiki kryzysowej na podstawie historyczno-systemologicznej (HS-) analizy normalizowanych wskaźników rozwoju wszystkich mod (rodzajów) transportu w wielkich społeczno-terytorialnych systemach (STS),na przykładach sektorów transportu USA, Unii Europejskiej (UE-28) i Federacji Rosyjskiej. Analiza jest prowadzona w kontekstach strukturalnym i funkcjonalnym z kompleksową oceną zbieżności i jest oparta na semantycznym modelowaniu.
An experimental model for mimicking biological systems: the Belousov-Zhabotinsky reaction in Lipid membranes
2006
Modeling multipartite virus evolution: the genome formula facilitates rapid adaptation to heterogeneous environments
2020
Multipartite viruses have two or more genome segments, and package different segments into different particle types. Although multipartition is thought to have a cost for virus transmission, its benefits are not clear. Recent experimental work has shown that the equilibrium frequency of viral genome segments, the setpoint genome formula (SGF), can be unbalanced and host-species dependent. These observations have reinvigorated the hypothesis that changes in genome-segment frequencies can lead to changes in virus-gene expression that might be adaptive. Here we explore this hypothesis by developing models of bipartite virus infection, leading to a threefold contribution. First, we show that th…
Contribution to thermal behaviour study of lithium-ion battery for electric and hybrid electric vehicle
2014
The main objectives of this study are to provide the essential information on the thermal behaviour of the battery cells for automotive purpose especially for EVs and HEVs through experimental work in order to develop an effective 3D electro-thermal model for lithium ion battery cells and pack. The experimental study is focusing on the distribution of temperature at various points of the battery cell surface, impact of different constant discharge rates, and also the importance of cooling system on the battery temperature behaviour. This thesis highlights the battery cell temperature under abuse discharge condition and the impact of stacking the battery cells inside the battery pack. Impact…
Contribution to the modeling of microstructural corrosion on aluminium alloys : definition of a methodology to study the bimetallic corrosion phenome…
2008
The initiation and the propagation of aluminum alloys microstructural corrosion is mainly based on the bimetallic corrosion phenomenon. This type of corrosion is caused by galvanic coupling at a local scale between the different phases contained in the alloy. The description of the localized corrosion phenomenon has been largely studied. Their complexity can explain why they are so difficult to predict by the way of numerical tools and why the works that have been done on this subject are so scarce. The present thesis brings a new contribution to this field by suggesting a methodology based on the complementary use of local electrochemical techniques and the finite element simulation of bim…
Évaluation ergonomique du serveur intranet Bull
1997
Rapport de contrat Bull INRIA; Évaluation par inspection du serveur intranet Bull
Ārējo ekonomisko pārstāvniecību ietekme uz Latvijas eksportu
2016
Sadarbības attiecību dibināšana ārvalstīs, ko dēvē par internacionalizāciju, stiprina izaugsmi, uzlabo konkurētspēju un atbalsta ilgtspēju uzņēmumā. Tas ir liels un sarežģīts solis lielākai daļai mazu ražotāju. Lai palīdzētu uzņēmumiem pārvarēt grūtības, daudzās pasaules valstīs tiek izstrādātas atbalsta programmas. Latvijas Investīciju un attīstības aģentūras un tās ārvalstu pārstāvniecību darbības rezultāti nekad netika pētīti. Darba mērķis ir ar ekonometriskām metodēm novērtēt ārvalstu ekonomisko pārstāvniecību ietekmi uz Latvijas eksportu. Pētījumā iegūtie Latvijas eksportu ietekmējošo faktoru novērtējumu rezultāti nav stabili un ir interpretējami ar piesardzību. Modeļi, kuros tika novē…