Search results for "note"
showing 10 items of 10709 documents
Iekštelpu atrašanās vietas noteikšana, izmantojot Android viedtālruni
2019
Darbā tika pētīti dažādi iekštelpu atrašanās vietas noteikšanas risinājumi, kur tie tika simulēti iekštelpās un implementēti autora veidotā, vienkāršotā Android lietotnē, kuras ģenerētie dati ļāva veikt dažādo risinājumu salīdzināšanu. Darba mērķis ir, simulējot dažādās metodes, izcelt risinājumu stiprās un vājās puses, kuru rezultātā veidotos nākotnes vīzija par optimizētu jaukto risinājumu, kurš apkopotu plusus un uzlabotu vai pilnībā likvidētu vājības. Darba rezultātā izstrādāta Android lietotne, kura spēj ģenerēt dažādo risinājumu informāciju par lietotāja atrašanās vietu iekštelpās.
Aizskarošu tekstu filtrēšana ar neironu tīklu metodēm
2020
Pētījuma mērķis ir izstrādāt neironu tīklu modeli, kas spēj izvērtēt angļu valodā rakstītu tekstu un noteikt aizskaroša satura esamību. Pētījuma ietvaros apskatītas tādas teksta apstrādes metodes kā lemmatizēšana un teksta sadalīšana tekstvienībās, veikta datu kopas sagatavošana un salīdzināti vairāki neironu tīklu arhitektūru tipi. Rezultātā iegūts neironu tīkla modelis, kas ar 93,75% precizitāti spēj noteikt aizskaroša teksta esamību noteiktā teksta gabalā. Izstrādātais modelis pārsēj pētījumā apskatīto bāzlīnijas metodes precizitāti par 33,28%. Pētījuma ietvaros izstrādāta tīmekļa lietotne, kas pielieto izstrādāto modeli un vizuāli ataino iegūtos rezultātus.
Performance of Lead-Acid Batteries with Nanostructured Electrodes at Different Temperature
2018
In this work we present innovative lead-acid batteries with nanostructured electrodes, which are cycled in a wide range of temperatures typically of lead-acid commercial batteries (EN 61427-1: 2013). In comparison to parameters usually used to commercial batteries, much more stressful conditions in terms of cut-off, charge/discharge rate and discharge were imposed.
High-Performance Lead-Acid Batteries Enabled by Pb and PbO2 Nanostructured Electrodes: Effect of Operating Temperature
2021
Lead-acid batteries are now widely used for energy storage, as result of an established and reliable technology. In the last decade, several studies have been carried out to improve the performance of this type of batteries, with the main objective to replace the conventional plates with innovative electrodes with improved stability, increased capacity and a larger active surface. Such studies ultimately aim to improve the kinetics of electrochemical conversion reactions at the electrode-solution interface and to guarantee a good electrical continuity during the repeated charge/discharge cycles. To achieve these objectives, our contribution focuses on the employment of nanostructured electr…
Monoteísmo cristiano y laicismo moderno
2010
La renuencia de las iglesias cristianas -especialmente, la católica- a coexistir con cualquier orden profano autónomo, es un rasgo recurrente de la historia de Europa. El objetivo de este artículo es mostrar que tal renuencia no responde sólo a causas externas, sino que tiene un fundamento teológico en la concepción monoteísta del Dios cristiano. A tal efecto, se traza primero la genealogía histórica de esa teología, desde sus orígenes hasta el Medioevo, para presentar a continuación algunas versiones secularizadas del monoteísmo en la Modernidad, a las cuales se contraponen otras creaciones de la cultura moderna radicalmente laicas.
Understanding the White-Emitting CaMoO4 Co-Doped Eu3+, Tb3+, and Tm3+ Phosphor through Experiment and Computation
2019
In this article, the synthesis by means of the spray pyrolysis method, of the CaMoO4 and rare-earth cation (RE3+)-doped CaMoO4:xRE3+ (RE3+ = Eu3+, Tb3+, and Tm3+; and x = 1, 2, and 4% mol) compounds, is presented. The as-synthesized samples were characterized using X-ray diffraction, Rietveld refinement, field emission scanning electron microscopy (FE-SEM), Raman spectroscopy, and photoluminescence (PL) spectroscopy. To complement and rationalize the experimental results, first-principles calculations, at the density functional theory level, have been performed to analyze the band structure and density of states. In addition, a theoretical method based on the calculations of surface energie…
Production and Properties of Starch Citrates—Current Research
2020
Starch modification by chemical reaction is widely used to improve the properties of native starch. Modified by citric acid, starch is characterized by specific properties resulting from the presence of citrate residues and as a result of cross-linking starch. The chemicals used for preparing starch citrates are safe for human health and the natural environment compared to the harsh chemicals used for conventional modifications. Starch citrates are traditionally produced by heating starch–citric acid mixtures in semi-dry conditions or by a heat moisture treatment. The conditions of the modification process (roasting temperature, heating time, citric acid dose) and the botanic source or geno…
Formation of Si/SiO2 Luminescent Quantum Dots From Mesoporous Silicon by Sodium Tetraborate/Citric Acid Oxidation Treatment
2019
We propose a rapid, one-pot method to generate photoluminescent (PL) mesoporous silicon nanoparticles (PSiNPs). Typically, mesoporous silicon (meso-PSi) films, obtained by electrochemical etching of monocrystalline silicon substrates, do not display strong PL because the silicon nanocrystals (nc-Si) in the skeleton are generally too large to display quantum confinement effects. Here we describe an improved approach to form photoluminescent PSiNPs from meso-PSi by partial oxidation in aqueous sodium borate (borax) solutions. The borax solution acts to simultaneously oxidize the nc-Si surface and to partially dissolve the oxide product. This results in reduction of the size of the nc-Si core …
Pressure-Dependent Tuning of Photoluminescence and Size Distribution of Carbon Nanodots for Theranostic Anticancer Applications
2020
Carbon nanodots (CDs) have recently attracted attention in the field of nanomedicine because of the biocompatibility, cost-effective nature, high specific surface, good near infrared (NIR) photothermal conversion into heat and tunable fluorescence properties, which have paved the way toward incorporating use of CDs into innovative anticancer theranostic platforms. However, a reliable synthesis of CDs with established and controlled physiochemical proprieties is precluded owing to the lack of full manipulation of thermodynamic parameters during the synthesis, thus limiting their use in real world medical applications. Herein, we developed a robust solvothermal protocol which allow fine contr…