Search results for "Ray"

Spectral entropy based neuronal network synchronization analysis based on microelectrode array measurements

2016

Synchrony and asynchrony are essential aspects of the functioning of interconnected neuronal cells and networks. New information on neuronal synchronization can be expected to aid in understanding these systems. Synchronization provides insight in the functional connectivity and the spatial distribution of the information processing in the networks. Synchronization is generally studied with time domain analysis of neuronal events, or using direct frequency spectrum analysis, e.g., in specific frequency bands. However, these methods have their pitfalls. Thus, we have previously proposed a method to analyze temporal changes in the complexity of the frequency of signals originating from differ…

GPGPU-säteenseuranta

2012

Säteenseuranta on rinnakkaistuva ja laskentaintensiivinen tapa tuottaa kolmiulotteista tietokonegrafiikkaa. Yleiskäyttöiset grafiikkaprosessorit (GPGPU) ovat tehokkaita rinnakkaislaskentaprosessoreita, joiden avulla voidaan kiihdyttää säteenseurantaa. Tässä tutkielmassa käsitellään säteenseurannan toteuttamista yleiskäyttöisillä grafiikkaprosessoreilla ja esitetään rakenne yksinkertaiselle GPGPU-säteenseurantaohjelmalle. Käsittelyn aiheena ovat myös säteenseurantaa kiihdyttävien menetelmien, kuten kiihdytysrakenteiden, toteuttaminen GPGPU-laskennalla. Ray tracing is a parallel and computationally intensive way of producing three dimensional computer graphics. General-purpose graphics proces…

Evaluación microestructural de materiales nanoparticulados preparados a partir de caolines

2009

En el presente trabajo se han seleccionado dos caolines con características microestructurales muy diferenciadas, y se les ha aplicado un tratamiento mecánico con un molino de discos de giro excéntrico empleando dos accesorios de distinta efectividad; un conjunto de copa y cilindro de ágata (ag) y otro de copa, anillo y cilindro de acero recubierto de carburo de wolframio (CW). Los materiales sin tratar y los generados en la molienda se han caracterizado microestructuralmente a través de tres métodos diferentes de análisis basados en datos de difracción de rayos X, y por microscopía electrónica de barrido. Se ha complementado la caracterización de los materiales con estudios de determinació…

Teoria dei regimi politici di Raymond Aron

2008

Religijna motywacja postu

2016

The research of the religious motivation of fast in the light of the theory and practice, within the framework of three great monotheistic religions, came to the following conclusions: fasting, as a religiously motivated act, expresses its deep conviction about depending on the man and his fate from God; may be motivated by the need to show contrition before God for the committed sins; expresses hu mility in the face of the threatening danger; as a way of preparation, purifiation before major holidays; as one of the elements in commemoration of important events; as the source of peace and balance in the individual and social life; is a tool to help tame the passions; prepares for a new phas…

HYPERBLEND: SIMULATING SPECTRAL REFLECTANCE AND TRANSMITTANCE OF LEAF TISSUE WITH BLENDER

2022

Abstract. Remotely sensing vegetation condition and health hazards requires modeling the connection of plants’ biophysical and biochemical parameters to their spectral response. Even though many models exist already, the field suffers from lack of access to program code. In this study, we will assess the feasibility of open-source 3D-modeling and rendering software Blender in simulating hyperspectral reflectance and transmittance of leaf tissue to serve as a base for a more advanced large-scale simulator. This is the first phase of a larger HyperBlend project, which will provide a fully open-source, canopy scale leaf optical properties model for simulating remotely sensed hyperspectral imag…

Study of the thermochromic phase transition in CuMo1−xWxO4 solid solutions at the W L3-edge by resonant X-ray emission spectroscopy

2021

This is the peer reviewed version of the following article: I. Pudza, A. Kalinko, A. Cintins, A. Kuzmin, Acta Mater. 205 (2021) 116581, which has been published in final form at https://www.sciencedirect.com/science/article/abs/pii/S1359645420310181 This article may be used for non-commercial purposes in accordance with Elsevier Terrms and Conditions for Self-Archiving.

Optimization of Spray-Drying Process of

2019

Jerusalem artichoke is an important natural matrix for inulin production. In this experiment, response surface methodology (RSM) was employed to optimize the spray-drying parameters in order to determine the maximal inulin yield. For this study, three independent variables (heating temperature (Tª, 110–120 °C), creep speed (V, 18–22 rpm) and pressure (P, 0.02–0.04 MPa)) were used in the experimental design. Using the Box–Behnken design, the optimal parameters obtained were: drying temperature 114.6 °C, creep speed 20.02 rpm, and pressure: 0.03 MPa. The inulin yield, water content and particle size of inulin obtained by spray-drying and freeze-drying were compared. In this regard, the spray-…

Photoinduced lethal and sublethal toxicity of retene, a polycyclic aromatic hydrocarbon derived from resin acid, to coregonid larvae

2004

A comparative investigation on the acute phototoxicity of retene to vendace (Coregonus albula) and whitefish (C. lavaretus), both having pelagial larvae in spring, was conducted. To test the concept of early warning of sublethal biomarkers in relation to lethality to posthatch stages, we examined the effects of ultraviolet-B (UV-B) and retene on the levels of cytochrome P4501A (CYP1A) and heat shock protein 70 (HSP70) by exposing the animals to elevated levels of these factors for 48 and 72 h, respectively. Whereas UV-B and retene on their own were not lethal, simultaneous retene and UV-B exposure caused very high mortality to both species. The median lethal concentration (LC50; i.e., the c…

A double-blind, placebo-controlled comparison of treatment with fluticasone propionate and levocabastine in patients with seasonal allergic rhinitis

1999

Fluticasone propionate aqueous nasal spray (FPANS) is a topically active glucocorticoid which has been successfully used for the treatment of seasonal allergic rhinitis (SAR). Topical levocabastine is a highly selective H1 antagonist which has been proposed as an alternative treatment of SAR. The purpose of this study was to compare the clinical efficacy of two topical nasal treatments, FPANS and levocabastine, in the treatment of SAR. Additionally, the effect of treatments on nasal inflammation was examined during natural pollen exposure. A group of 288 adolescent and adult patients with at least a 2-year history of SAR to seasonal pollens participated in a multicenter, doubleblind, double…