Search results for "SID"
showing 10 items of 6756 documents
Aspazijas personības un daiļrades apguve 11. klasē
2019
Diplomdarba „Aspazijas personības un daiļrades apguve 11. klasē” mērķis ir izveidot metodiskās sistēmas variantu, kas veicinātu skolēnu interesi par literatūru un rosinātu pētīt Aspazijas daiļradē rodamās idejas. Darbam ir piecas nodaļas ar apakšnodaļām, ievads, secinājumi un pielikumi. Pirmajā nodaļā iepazīta Aspazijas personība un tās ietekme uz dzejnieces daiļradi, kā arī Aspazijas dzejas un drāmas specifika, uzsverot skolēniem noderīgo informāciju. Otrajā nodaļā ir apzināta teorētiskā literatūra par literatūru kā mācību priekšmetu un tā specifiku. Trešajā nodaļā ir aprakstīta skolotāja sagatavošanās darbam klasē, iekļaujot skolēnu vecumposma īpatnības, pētījumā iesaistīto skolēnu rakstu…
Persistencia de residuos de disparo en puños de prendas de vestir
2013
La detección de partículas de residuos de disparo (RDD) en las ropas de un sospechoso es una evidencia muy importante en los casos judiciales para determinar si la persona disparó o no un arma de fuego. Sin embargo, debido a simples roces con otras superficies, las partículas asociadas al disparo se pierden por la actividad física de una persona. En este estudio se analizó la permanencia de los RDD retenidos sobre puños de prendas de vestir, luego de disparar una pistola calibre 9mm. Valiéndose de la técnica de Microscopía Electrónica de Barrido (SEM) combinada con Espectrometría de Energía Dispersiva (EDS) se caracterizó la morfología, composición y densidad de los RDD recolectados, tenien…
Propiedades Psicométricas de la Escala de Creencia en un Mundo Justo General y Personal en el Contexto Argentino
2018
El objetivo principal de este trabajo fue analizar las propiedades psicométricas de las Escalas de Creencia en un Mundo Justo General y Personal. Para tal fin, se examinó la estructura interna de ambas, testeando si evalúan un mismo constructo global o constituyen dos dimensiones diferenciadas, la consistencia interna de cada una y sus relaciones con las orientaciones religiosas. Participaron del estudio 328 estudiantes universitarios de la Ciudad Autónoma de Buenos Aires con edades entre 18 y 40 años (M = 24,1; DT = 3,88). El 36,6% eran hombres (n = 120) y el 63,4% mujeres (n = 208). Los resultados del estudio sugieren propiedades psicométricas adecuadas para ambas escalas de CMJ. Además, …
Cryo-EM structure of ssDNA bacteriophage ΦCjT23 provides insight into early virus evolution.
2022
AbstractThe origin of viruses remains an open question. While lack of detectable sequence similarity hampers the analysis of distantly related viruses, structural biology investigations of conserved capsid protein structures facilitate the study of distant evolutionary relationships. Here we characterize the lipid-containing ssDNA temperate bacteriophage ΦCjT23, which infects Flavobacterium sp. (Bacteroidetes). We report ΦCjT23-like sequences in the genome of strains belonging to several Flavobacterium species. The virion structure determined by cryogenic electron microscopy reveals similarities to members of the viral kingdom Bamfordvirae that currently consists solely of dsDNA viruses wit…
Removing the saturation assumption in Bank-Weiser error estimator analysis in dimension three
2020
International audience; We provide a new argument proving the reliability of the Bank-Weiser estimator for Lagrange piecewise linear finite elements in both dimension two and three. The extension to dimension three constitutes the main novelty of our study. In addition, we present a numerical comparison of the Bank-Weiser and residual estimators for a three-dimensional test case.
Analytical description of solid particles kinematics due to a fluid flow and application to the depiction of characteristic kinematics in cold sprayi…
2017
Abstract In several multiphase flow applications such as fluidization, thermal spraying, atomization manufacturing and so on, the Newton's law is widely enacted to formulate the particle/fluid kinematic interaction and then to compute particles kinematics. This paper provides analytical solutions of the Newton's law in its time-dependent formulation or simplified formulation, the latter being a reduction of the time dependent problem into a spatial description of the particle motion. It was found that the velocity solution is strictly similar in both cases so that the simplified formulation is viable. The W_ 1 branch of the Lambert's function yields the analytical particle residence time an…
Experimental Equipment for Studying the Residual Stresses Developed During High Temperature Reactions by X-Ray Diffraction
1996
This paper describes a device dedicated to studyng, by X-ray diffraction the residual stresses developed on surface samples as a function of temperature and atmosphere conditions. The setup consists of : a.) an horizontal axis goniometer which allows the programmed positionning of the sealed X-ray source and of the linear detector. b.) a high temperature controlled atmosphere chamber Particular attention has been paid to the thermal stability up to 1200°C and the accurate position on the sample.
Strategies for numerical simulation of linear friction welding of metals: a review
2017
Linear friction welding (LFW) is a solid-state joining process used to weld non-axisymmetric components. Material joining is obtained through the reciprocating motion of two specimens undergoing an axial force. During this process, the heat source is determined by the frictional work transformed into heat. This results in a local softening of the material and plays a key role in the onset of the bonding conditions. In this paper, a critical analysis of the different approaches used to simulate the LFW processes is provided. The focus of the paper is the comparison of different modeling strategies and the most relevant outputs available, i.e. temperature, strain and stress distribution, mate…
Space charge behavior of different insulating materials employed in AC and DC cable systems
2017
In this work, the space charge accumulation in three different XLPE based material has been carried out by using the PEA (Pulsed Electro-Acoustic) method. The specimens provided by a cables industry have been subjected to the same DC stress during polarization time at environment temperature. Afterwards, the high voltage generator has been turned off and the amount residual charge has been evaluated. The space charge profiles during polarization and depolarization have been carried out and compared. Finally, the distribution of electric field within the samples has been reported. In particular, the maximum distortion of electric field has been calculated by taking into account the distribut…
Influence of spray trajectories on characteristics of cold-sprayed copper deposits
2021
Abstract Industrial robots are widely used in cold spray (CS) as well as thermal spray to produce various coatings by precisely controlling kinematic parameters during the process. However, the robot trajectory and its effect on the characteristics of CS deposits are important, but not fully studied. This article introduces four typical spray trajectories, including zigzag path, cross path, parallel path, and spiral path, to elaborate thick CS Cu deposits, and characterizes the corresponding Cu deposits, respectively. The experimental results revealed that the spray trajectories have a major influence on the associated thermal history and the residual stress distribution. However, no signif…