Search results for "Fab"
showing 10 items of 1201 documents
Anatomiskās, morfoloģiskās un fizioloģiskās izmaiņas kukurūzai (Zea mays L.) un lauka pupām (Vicia faba) cinka ietekmē
2017
Piesārņojums ar smagajiem metāliem ir aktuāla pasaules mēroga problēma, kas galvenokārt saistīta ar metalurģijas un intensīvās lauksaimniecības attīstību un tās radītajām sekām. Pētījumu veica Latvijas Universitātes Bioloģijas fakultātes Augu Fizioloģijas katedrā laika posmā no 2015. gada oktobra līdz 2017. gada maijam. Šī darba mērķis bija izpētīt dažādu cinka koncentrāciju substrātā ietekmi uz augu morfoloģiskajām, anatomiskajām un fizioloģiskajām izmaiņām, kā modeļobjektus izmantojot lauka pupu (Vicia faba) un kukurūzu (Zea mays). Pētījumā atklājās, ka lauka pupās un kukurūzā hlorofila koncentrācija lapās variantos ar mazu cinka koncentrāciju palielinās, bet variantos ar lielu cinka konc…
HYPERSPECTRAL REFLECTANCE SIGNATURES AND POINT CLOUDS FOR PRECISION AGRICULTURE BY LIGHT WEIGHT UAV IMAGING SYSTEM
2018
Abstract. The objective of this investigation was to study the use of a new type of a low-weight unmanned aerial vehicle (UAV) imaging system in the precision agriculture. The system consists of a novel Fabry-Perot interferometer based hyperspectral camera and a high-resolution small-format consumer camera. The sensors provide stereoscopic imagery in a 2D frame-format and they both weigh less than 500 g. A processing chain was developed for the production of high density point clouds and hyperspectral reflectance image mosaics (reflectance signatures), which are used as inputs in the agricultural application. We demonstrate the use of this new technology in the biomass estimation process, w…
Plasmonic Stripes in Aqueous Environment Co-Integrated With Si3N4 Photonics
2018
We demonstrate the design, fabrication, and the experimental characterization of gold-based plasmonic stripes butt-coupled with low-pressure-chemical-vapor-deposition (LPCVD)-based Si3N4 waveguides for the excitation of surface-plasmon-polariton (SPP) modes in aqueous environment. Plasmonic gold stripes, in aqueous environment, with cross-sectional dimensions of 100 nm × 7 μm were interfaced with 360 nm × 800 nm Si3N4 waveguides cladded with low-temperature-oxide, exploiting linear photonic tapers with appropriate vertical (VO) and longitudinal (LO) offsets between the plasmonic and photonic waveguide facets. An interface insertion loss of 2.3 ± 0.3 dB and a plas…
Phase-Sensitive Detection for Optical Sensing With Porous Silicon
2012
We report on a photonic sensor with an ultralow limit of detection (LoD) based on a phase interrogation readout scheme together with an anisotropic porous silicon (PSi) membrane. First, the fabrication of porous free-standing membranes from medium doped (100) surface oriented silicon, with pore diameters suitable for the infiltration of biomolecules, around 50 nm, is reported. Then, the phase interrogation scheme for characterizing the PSi membranes is presented whose results show that while volumetric sensitivity increases with the membrane thickness, the resolution in the birefringence measurements decrease dramatically due to depolarization effects. The best LoD was found to be equal to …
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 …
3D RECONSTRUCTION-REVERSE ENGINEERING- DIGITAL FABRICATION OF THE EGYPTIAN PALERMO STONE USING BY SMARTPHONE AND LIGHT STRUCTURED SCANNER
2018
Abstract. This paper presents a pipeline that has been developed to acquire a shape with particular features both under the geometric and radiometric aspects. In fact, the challenge was to build a 3D model of the black Stone of Palermo, where the oldest Egyptian history was printed with the use of hieroglyphs. The dark colour of the material and the superficiality of the hieroglyphs' groove have made the acquisition process very complex to the point of having to experiment with a pipeline that allows the structured light scanner not to lose the homologous points in the 3D alignment phase. For the texture reconstruction we used a last generation smartphone.
Fabry Disease, a Complex Pathology Not Easy to Diagnose
2015
Fabry disease is a multisystemic lysosomal storage disorder, inherited in an X-linked manner. It is a defect of metabolism of the glycosphingolipids, due to the reduction or absence of the activity of lysosomal enzyme α-galactosidase A. This reduction of activity causes the storage of globotriaosylceramide and derivatives in the lysosomes, triggering a cascade of cellular events, mainly in vascular endothelium. These events are the responsible for the systemic clinical manifestations and the renal, cardiac and cerebrovascular complications, or a combination of them. The symptomatology can lead to the premature death of patient between the fourth or fifth decade of life. The first symptoms c…
A classical phenotype of Anderson-Fabry disease in a female patient with intronic mutations of the GLA gene: a case report
2012
Abstract Background Fabry disease (FD) is a hereditary metabolic disorder caused by the partial or total inactivation of a lysosomal hydrolase, the enzyme α-galactosidase A (GLA). This inactivation is responsible for the storage of undegraded glycosphingolipids in the lysosomes with subsequent cellular and microvascular dysfunction. The incidence of disease is estimated at 1:40,000 in the general population, although neonatal screening initiatives have found an unexpectedly high prevalence of genetic alterations, up to 1:3,100, in newborns in Italy, and have identified a surprisingly high frequency of newborn males with genetic alterations (about 1:1,500) in Taiwan. Case presentation We des…
Impacto de la implementación de un modelo ecoformativo a través de proyectos estratégicos : el caso de la Universidad Castro Carazo (Costa Rica)
2020
La Universidad Castro Carazo ha adoptado un modelo educativo de ecoformación desde el año 2016. Para esto, ha sido necesaria la incorporación de buenas prácticas y estrategias de innovación pedagógica y curricular, como parte integral de sus procesos educativos y administrativos. En este artículo se detallan las prácticas y estrategias más relevantes: el diseño e implementación de un programa de especialización en docencia universitaria, la inauguración de un laboratorio de aprendizaje para el fomento del aprendizaje mediante la fabricación digital, los multientornos, y los mapas conceptuales, así como el fortalecimiento de un equipo de innovación curricular. Estos procesos disruptivos han …
La Gramàtica valenciana de Manuel Sanchis Guarner
2015
This article studies Sanchis Guarner's Gramàtica Valenciana, trying to assess its relevant contribution, referring not only to the author's ideology and established goal, but also to its historical context and to its Catalan as well as Valencian precedents, like Fabra on one side, and Fullana, Giner and Salvador, on the other.