Search results for "PD"
showing 10 items of 1971 documents
A SIMPLE PARTICLE MODEL FOR A SYSTEM OF COUPLED EQUATIONS WITH ABSORBING COLLISION TERM
2011
We study a particle model for a simple system of partial differential equations describing, in dimension $d\geq 2$, a two component mixture where light particles move in a medium of absorbing, fixed obstacles; the system consists in a transport and a reaction equation coupled through pure absorption collision terms. We consider a particle system where the obstacles, of radius $\var$, become inactive at a rate related to the number of light particles travelling in their range of influence at a given time and the light particles are instantaneously absorbed at the first time they meet the physical boundary of an obstacle; elements belonging to the same species do not interact among themselves…
Application of an HPLC-MS/MS method for mycotoxin analysis in commercial baby foods
2012
Abstract This article describes the validation of an analytical method for the detection of 21 mycotoxins in baby food. The analytical method is based on the simultaneous extraction of selected mycotoxins by matrix solid-phase dispersion (MSPD) followed by liquid chromatography coupled with tandem mass spectrometry (LC–MS/MS) using a hybrid triple quadrupole-linear ion trap mass spectrometer (QTRAP®). Information Dependent Acquisition (IDA), an extra confirmation tool for samples that contain the selected mycotoxins, was used. The matrix effects were evaluated, and the corrections for the matrix effects were performed using two calibration approaches: external matrix-matched calibration and…
Deep semantic lung segmentation for tracking potential pulmonary perfusion biomarkers in chronic obstructive pulmonary disease (COPD): The multi‐ethn…
2019
Background Chronic obstructive pulmonary disease (COPD) is associated with high morbidity and mortality. Identification of imaging biomarkers for phenotyping is necessary for future treatment and therapy monitoring. However, translation of visual analytic pipelines into clinics or their use in large-scale studies is significantly slowed by time-consuming postprocessing steps. Purpose To implement an automated tool chain for regional quantification of pulmonary microvascular blood flow in order to reduce analysis time and user variability. Study type Prospective. Population In all, 90 MRI scans of 63 patients, of which 31 had a COPD with a mean Global Initiative for Chronic Obstructive Lung …
Partial data inverse problems for Maxwell equations via Carleman estimates
2015
In this article we consider an inverse boundary value problem for the time-harmonic Maxwell equations. We show that the electromagnetic material parameters are determined by boundary measurements where part of the boundary data is measured on a possibly very small set. This is an extension of earlier scalar results of Bukhgeim-Uhlmann and Kenig-Sj\"ostrand-Uhlmann to the Maxwell system. The main contribution is to show that the Carleman estimate approach to scalar partial data inverse problems introduced in those works can be carried over to the Maxwell system.
On the semiclassical limit of the defocusing Davey-Stewartson II equation
2018
Inverse scattering is the most powerful tool in theory of integrable systems. Starting in the late sixties resounding great progress was made in (1+1) dimensional problems with many break-through results as on soliton interactions. Naturally the attention in recent years turns towards higher dimensional problems as the Davey-Stewartson equations, an integrable generalisation of the (1+1)-dimensionalcubic nonlinear Schrödinger equation. The defocusing Davey-Stewartson II equation, in its semi-classical limit has been shown in numerical experiments to exhibit behavior that qualitatively resembles that of its one-dimensional reduction, namely the generation of a dispersive shock wave: smooth i…
On the convergence of fixed point iterations for the moving geometry in a fluid-structure interaction problem
2019
In this paper a fluid-structure interaction problem for the incompressible Newtonian fluid is studied. We prove the convergence of an iterative process with respect to the computational domain geometry. In our previous works on numerical approximation of similar problems we refer this approach as the global iterative method. This iterative approach can be understood as a linearization of the so-called geometric nonlinearity of the underlying model. The proof of the convergence is based on the Banach fixed point argument, where the contractivity of the corresponding mapping is shown due to the continuous dependence of the weak solution on the given domain deformation. This estimate is obtain…
Ģeogrāfijas mācību satura integrēšana Latvijas un pasaules vēstures stundās 7.klasē
2022
Diplomdarba temats: “Ģeogrāfijas mācību satura integrēšana Latvijas un pasaules vēstures stundās 7. klasē” (“Integration of Geography Curriculum in Latvia and World History Lessons in 7th Grade”). Mūsdienu izglītības sistēma Latvijā un pasaulē ir orientēta uz lietpratīgu un kompetentu skolēnu sagatavošanu. Līdzās noteiktām zināšanām svarīgas ir kļuvušas arī prasmes. Ir svarīgi, ka zināšanas un prasmes, ko palīdz veidot un attīstīt viena mācību priekšmeta apguves process, var tikt pārnestas un izmantotas arī cita mācību priekšmeta apguvē. Tādējādi rodas iespēja padziļināti izprast noteiktus procesus un ieraudzīt likumsakarības. Mūsdienu skolotājam jāspēj pārkāpt savas mācību jomas un mācību …
Uzņēmējdarbības procesa izveide SharePoint sadarbības sistēmā
2019
Kvalifikācijas darbs apraksta komercprojektu reģistrācijas sistēmu. Šī sistēma ir paredzēta uzņēmumiem, kas strādā ar Sharepoint vidi. Tas ļauj uzņēmuma darbiniekiem, kuriem ir piekļuve serverim, izveidot un aizpildīt reģistrācijas veidlapu, kas satur informāciju par savu nākotnes projektu vai to rezultātus viegli pieejamā PDF formātā, kā arī iespēju uzņēmuma “galveniem” dot atļauju tās īstenošanai. Sistēmā ir trīs galvenas lietotāju grupas. Katrai lietotāju grupai ir paredzētas noteiktas iespējas izmantot informāciju, kas ir ievadīta PDF veidlapā. Izstrādātās sistēmas mērķis ir automatizēt jaunu projektu reģistrāciju ķīmijas rūpniecībā, kas paātrinās darba procesu un atvieglos komunikāciju…
Procesu nodrošināšanas platforma
2022
Kvalifikācijas darbs apraksta Apdrošināšanas atlīdzību pieteikumu procesu nodrošināšanas sistēmu, kura sastāv no divām sistēmām: Apdrošināšanas atlīdzību pieteikumu reģistrācijas lietotnes un Apdrošināšanas atlīdzību pieteikumu formu validācijas un apstrādes sistēmas. Lietotne izmanto Apdrošināšanas atlīdzību pieteikumu formu validācijas un apstrādes sistēmas REST API, kas tiek lietots apdrošināšanas klientu jeb lietotnes lietotāju autentifikācijai, apdrošināšanas atlīdzību pieteikumu izveidei un izveidoto pieteikumu apskatei. Lietotne realizēta JavaScript valodā, izmantojot Vue.js ietvaru, formu validācijas un apstrādes sistēma papildināta ar lietotāju moduli, kas izstrādāts Python valodā,…
Nuovi dati sulla presenza di Eryx jaculus (Linnaeus, 1758) in Sicilia
2017
The javelin sand boa {Eryx jaculus) is a snake belonging to the Erycidae family, distributed in North Africa, southern Balkans and the Middle East. Recently its presence was confirmed in Italy, in a small area along the coast of south-central Sicily, in the territories of Licata (province of Agrigento). This paper reports the current distribution area, of about 52 km2, obtained by the Minimum Convex Polygon method, using recent bibliographical ob-servations and three new observations carried out between 15 August 2014 and 30 Aprii 2016. The new findings are located east of the known Sicilian distribution area and indicate for the first time the presence of the javelin sand boa in the provin…