Search results for "Iode"

Projekts: Zemnieku saimniecības "Rupieši" dibināšana

2015

Maģistra darba mērķis ir izvērtēt lauksaimniecības nozares attīstības iespējas Latvijas lauku reģionos. Šī mērķa īstenošanai izvēlēts projekts par Z/S „Rupieši” dibināšanu, kuras saimnieciskā darbība ir rapša audzēšana un graudkopība biznesa diversifikācijai. Izvēlētais pamata produkts ir rapsis, kura sēklas tiks realizētas biodegvielas ražošanai. Eiropa 2020 stratēģija nosaka sasniegt 10% biodegvielas izmantošanas īpatsvaru no kopējā degvielas patēriņa transporta nozarē, bet Latvija ir sasniegusi tikai 3,1%. Tas nodrošina valsts prioritāti biodegvielas un ar to saistītām nozarēm. Maģistra darbā tiek pamatota rentablas zemnieku saimniecības nodibināšanas iespējamība, pievēršot uzmanību būti…

Electro-optical characterization of new classes of Silicon Carbide UV photodetectors

2014

In this paper, we present the fabrication process steps and the characterization of 4H-SiC vertical Schottky UV detectors, where interdigitated strips, acting as top metal contacts, have been realized in $\hbox{Ni}_{2}\hbox{Si}$ . These devices exploit the pinch-off surface effect. $I$ – $V$ and $C$ – $V$ characteristics, as functions of temperature, were measured in dark conditions. In addition, we have carried out responsivity measurements, for wavelengths ranging from 200 to 400 nm, at varying package temperature and applied reverse bias. A comparison among devices having different strip pitch sizes has been performed, thus finding out that the 10- $\mu\hbox{m}$ pitch class demonstrates …

Failure Rate Measurement on Silicon Diodes Reverse Polarized at High Temperature

2017

This paper calculates the failure rate on reversed polarized silicon diodes with the aim to justify, experimentally, the rules of the European Space Agency (ESA) which are referred to the component life’s extension, the reliability increase and the end of life performance enhancement, by using oversized devices (derating rules). In order to verify the derating rules, 80 silicon diodes are used, which are reverse polarized in a high temperature environment. The diodes are divided in 4 groups of 20 diodes, applying a different voltage to each group, in order to relate the failure rate to the applied derating rule. The experiment described in this paper is developed using a temperature acceler…

Prototyping and Characterization of 1.2KV SIC Schottky Diodes for TWTA Application: The Challenge to Meet the User Specification

2017

Preliminary assessment of the possibility of supporting the decomposition of biodegradable packaging

2017

This article presents a preliminary evaluation of the possibility of using grass biomass from a sports field as a compost ingredient which positively affects the degree of decomposition of the biodegradable wrappings. For 5 months the biodegradable bags were stored, both empty and filled with organic waste in the heap of grass clippings. After that period, fragments of the bags were observed under the microscope and then assessed the state of their decomposition. The results indicate that the biomass used favourably affected the process of bag degradation, however the speed of decomposition of the empty bags was quicker than the bags filled with the organic waste.

Estrategias de afrontamiento en adultos mayores en función de variables sociodemográficas (Coping strategies in older adults as a function of sociode…

2015

Coping strategies are used to adapt to the changes that occur during aging. This study investigated 275 older adults who attended a senior citizen’s centre. They provided sociodemographic data and answered the Stress Coping Questionnaire (SCQ) in a semistructured interview. The aim was to analyse the use of coping strategies based in several sociodemographic variables, using correlations, t tests, and ANOVAs. The results showed a positive and significant association between age and religion, and differences were found in gender, marital status, educational attainment, and income level. In conclusion, as age increases, religion is most commonly used coping strategy; women make greater use of…

Rayleigh Equation Anomaloscope from Commercially Available LEDs

2012

Most precise classification of CVD (color vision deficits) can be provided by using anomaloscope. Today anomaloscopes are available, which can evaluate red-green (Rayleigh) and blue-green (Moreland) color defects.DOI: http://dx.doi.org/10.5755/j01.ms.18.2.1928

“SmartGlass” Obstacles for Dynamic Inducing of Light Scattering in Vision Research Experiments

2017

We describe a technique that allows control of visual stimuli quality through the use of a setup with a polymer dispersed liquid crystal (PDLC) film positioned in the optical pathway of one or both human eyes. Nowadays, PDLC films allow alteration of the resolution and contrast limits of the transmitted light due to continuous change in the light scattering that is obtained by the application of an AC electrical field. In our experimental setup, the use of a wide-aperture up to area of 20 x 15 cm2 PDLC sheet is combined with a flat-screen PC display or with a modified display emission block without its interference filter unit and with an installed individually controllable colored light-em…

Closed due to COVID-19: effects of indoor sports restrictions on suburban adults’ physical activity behaviours

2023

During the COVID-19 pandemic, people have been required adaptations in leisure-time physical activity (PA) especially due to restrictive policies concerning indoor sport facilities (ISF). This study investigated the effects of the constraints on ISF among residents of two low socioeconomic status suburbs in Finland. Research questions were: (1) Are sociodemographic characteristics associated with a reduced use of ISF during the pandemic? (2) Are sociodemographic characteristics associated with changes in the overall PA amount among those respondents with a reduced use of ISF? (3) Is the reduced use of ISF associated with an increased use of other PA environments (home environment, built out…

Molecular dynamics simulations of heavy ion induced defects in SiC Schottky diodes

2018

Heavy ion irradiation increases the leakage current in reverse-biased SiC Schottky diodes. This letter demonstrates, via molecular dynamics simulations, that a combination of bias and ion-deposited energy is required to produce the degradation. Peer reviewed