Algúns conceptos básicos de radiometría e fotometría

Titulación: Licenciatura de Física -- Materia: Dispositivos OptoelectrónicosOs optoelectrónicos son dispositivos de base electrónica que emiten, modulan ou detectan radiación óptica, i.e. radiación electromagnética ultravioleta, visíbel ou infravermella. A maior parte deste tipo de dispositivos están baseados en semicondutores inorgánicos, se ben é posíbel que nun futuro os semicondutores orgánicos pasen a desempeñar un papel máis importante. Nesta unidade introdúcense unha serie de conceptos relacionados coa radiación electromagnética, imprescindíbeis para o estudo dos dispositivos optoelectrónicos, e que ou ben non foron estudados noutras materias da carreira de física, ou ben o foron desde unha perspectiva moi afastada da necesaria para o estudo destes dispositivos.Universidade de Santiago de Compostela. Servizo de Normalización Lingüístic

Catón metódico de los niños : dispuesto para aprender á leer

En portada: "Aprobado por la Dirección General de Estudios para que sirva de texto en las escuelas"Copia digital. España : Ministerio de Cultura. Subdirección General de Coordinación Bibliotecaria, d202

An Approach to the Use of Depth Cameras for Weed Volume Estimation

The use of depth cameras in precision agriculture is increasing day by day. This type of sensor has been used for the plant structure characterization of several crops. However, the discrimination of small plants, such as weeds, is still a challenge within agricultural fields. Improvements in the new Microsoft Kinect v2 sensor can capture the details of plants. The use of a dual methodology using height selection and RGB (Red, Green, Blue) segmentation can separate crops, weeds, and soil. This paper explores the possibilities of this sensor by using Kinect Fusion algorithms to reconstruct 3D point clouds of weed-infested maize crops under real field conditions. The processed models showed good consistency among the 3D depth images and soil measurements obtained from the actual structural parameters. Maize plants were identified in the samples by height selection of the connected faces and showed a correlation of 0.77 with maize biomass. The lower height of the weeds made RGB recognition necessary to separate them from the soil microrelief of the samples, achieving a good correlation of 0.83 with weed biomass. In addition, weed density showed good correlation with volumetric measurements. The canonical discriminant analysis showed promising results for classification into monocots and dictos. These results suggest that estimating volume using the Kinect methodology can be a highly accurate method for crop status determination and weed detection. It offers several possibilities for the automation of agricultural processes by the construction of a new system integrating these sensors and the development of algorithms to properly process the information provided by them.The Spanish Ministry of Economy and Competitiveness has provided support for this research via projects AGL2014-52465-C4-3-R and AGL2014-52465-C4-1-R, and Bosch Foundation. We acknowledge support by the CSIC Open Access Publication Initiative through its Unit of Information Resources for Research (URICI)

Assessing a fleet of robots for herbicide applications

Advanced technologies are critical for safe, site-specific and efficient control of pests (weeds, pathogens and insects) in agricultural crops. Although the scientific and technological bases of precision crop protection are mostly known and robust, the commercial application of these new technologies is still very limited. To overcome this situation, new farming methods and processes should be designed. Modern approaches rely on existing information and communication technologies (ICT) and design and construction of improved pest and crop sensors, along with enhanced pest control actuators. Mobile platforms are essential to move the needed sensors and actuators throughout the work field. Moreover, by using autonomous mobile platforms equipped with innovative perception techniques, data processing systems and tools for action, pest control procedures can be applied only if, when and where they are needed, reducing costs, environmental damages and risks for farmers. This article describes the RHEA fleet of robots highlighting the concepts and analyzing the results achieved on the application of herbicide on wheat with a spray boom.This project is funded in part by the 7th Framework Programme of the European Union under Grant Agreement No. 245986.Peer Reviewe

Studies on the base catalyzed synthesis of acetophenone enolcarbamate enhanced by microwaves

The 10th International Electronic Conference on Synthetic Organic Chemistry session Symposium on Microwave Assisted SynthesisMicrowave assisted organic synthesis (MAOS) of N,N-diisopropyl enol carbamate of acetophenone is achieved in good yield when acetophenone, N,N-diisopropylcarbamoyl chloride and Hüning's base, DABCO or TMEDA were irradiated with microwaves. It is remarkable that reaction times are reduced from six days with conventional heating, to twenty minutesXUNTA DE GALICIA for financial support: PGIDIT05PXIB26201PR, PR405 A 098/59-0 . USC for a predoctoral fellowship to JCC

Microwave-assisted synthesis of 3-arylcoumarins

The 12th International Electronic Conference on Synthetic Organic Chemistry session Symposium on Microwave Assisted Synthesis3-arylcoumarins are prepared in good yields by microwave assisted solvent-free condensation of phenylacetic acids and phenylacetic esters, using potassium tert-butoxide as base.We acknowledge XUNTA DE GALICIA for financial support: PGIDIT05PXIB26201PR, PR405 A098/59-0. USC for a predoctoral fellowship to J. C.-C. This work was undertaken as part of the EC sponsored programs D32 COST Program (Chemistry in High-Energy Microenvironments, WG10)

Laser metal deposition on-line monitoring via plasma emission spectroscopy and spectral correlation techniques

Plasma spectroscopic techniques focused on the analysis of the plasma background radiation have been studied to enable an efficient on-line monitoring of a laser metal deposition process. The influence of different process parameters and elements, such as laser power, process speed, powder feeding rate and different powder and substrate compositions has been analyzed by means of several experimental trials. The resulting cladding patch analyzes via visual inspection and macrographs have been correlated with their associated spectroscopic monitoring signals. These studies have indicated that on-line quality monitoring of the laser metal deposition process is feasible by means of the proposed solutions, avoiding the identification and use of plasma emission lines. The latter improves the computational performance and avoids, not only the identification of each emission line, but also their specific sensitivity to certain defects. Spectral correlation techniques have also been proposed for monitoring purposes, thus enabling a more quantitative analysisThis work was supported in part by the Project “Noves tecnologies de laser cladding per a processos de conformat” (RD15-1-0098) funded by ACCIO (Generalitat de Catalunya) via FEDER funds. This work was also supported by projects PID2019-107270RB-C21/ AEI / 10.13039/501100011033

Study of the crosslinking reaction between Bisphenol A diglycidyl ether (BADGE) and a Zinc Porphyrin by Fourier transform infrared spectroscopy

The 19th International Electronic Conference on Synthetic Organic Chemistry session Polymer and Supramolecular ChemistryThe curing reaction of a system consisting of a diglycidyl ether of bisphenol-A (n= 0) and ZnTPyP (Zinc 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphyrin) was studied by Fourier Transform infrared spectroscopy (FTIR). A semi-empirical quantum chemistry program (MOPAC) was used to corroborate the experimental data. The tertiary amine ZnTPyP not only initiates the reaction but also reacts with the resin forming pyridone. This study demonstrates that macrocycles can be used as cross-linking agents for curing epoxy resins and that when metallomacrocycles are used, metal ions can be introduced into the network structur

Molecular Targets Implicated in the Antiparasitic and Anti-Inflammatory Activity of the Phytochemical Curcumin in Trichomoniasis

Trichomoniasis, is the most prevalent non-viral sexually transmitted disease worldwide. Although metronidazole (MDZ) is the recommended treatment, several strains of the parasite are resistant to MDZ, and new treatments are required. Curcumin (CUR) is a polyphenol with anti-inflammatory, antioxidant and antiparasitic properties. In this study, we evaluated the effects of CUR on two biochemical targets: on proteolytic activity and hydrogenosomal metabolism in Trichomonas vaginalis. We also investigated the role of CUR on pro-inflammatory responses induced in RAW 264.7 phagocytic cells by parasite proteinases on pro-inflammatory mediators such as the nitric oxide (NO), tumor necrosis factor α (TNFα), interleukin-1beta (IL-1β), chaperone heat shock protein 70 (Hsp70) and glucocorticoid receptor (mGR). CUR inhibited the growth of T. vaginalis trophozoites, with an IC50 value between 117 ± 7 μM and 173 ± 15 μM, depending on the culture phase. CUR increased pyruvate:ferredoxin oxidoreductase (PfoD), hydrogenosomal enzyme expression and inhibited the proteolytic activity of parasite proteinases. CUR also inhibited NO production and decreased the expression of pro-inflammatory mediators in macrophages. The findings demonstrate the potential usefulness of CUR as an antiparasitic and anti-inflammatory treatment for trichomoniasis. It could be used to control the disease and mitigate the associated immunopathogenic effectsThis research was funded by Xunta de Galicia (Spain), grant number ED431C2017/31S

Solvent Free Microwave Assisted Synthesis of 1,3,5-tris(2-aryloxyethyl)isocyanurates

The 14th International Electronic Conference on Synthetic Organic Chemistry session Microwave Assisted SynthesisSynthesis of 1,3,5-tris(2-aryloxyethyl)isocyanurates by esterification of 1,3,5-tris(2-hydroxyethyl)isocyanurate under microwave irradiation in a direct and efficient way in solvent free conditionsXUNTA DE GALICIA for financial support: INCITE09 262346P