Search results for "Satu"
showing 10 items of 1367 documents
Comparison between textured SnO2:F and Mo contacts with the p-type layer in p–i–n hydrogenate amorphous silicon solar cells by forward bias impedance…
2013
Abstract In this paper we compare the performance of the textured SnO2:F and Mo contacts with the p-type layer in p–i–n hydrogenate amorphous silicon (a-Si:H) solar cells. We use standard current–voltage (I–V) electrical characterization methods coupled with forward bias small signal impedance analysis. We show the efficacy of this technique to determine the effective carrier lifetime in photovoltaic cells. We show that such effective lifetimes are indeed directly connected to the respective dark diode saturation currents. We also find that the effective lifetime is constant with the temperature in the 0–70 °C range and it is significantly better for the solar cell with Mo diode contact. Th…
Optical saturation thermal lens spectrometry in non-polar solvents
1997
Abstract A model for thermal lens spectrometry (TLS) in partial optical saturation conditions which was previously applied to polar solutes in aqueous media is now checked with non-polar organic dyes and metal dithizonates in carbon tetrachloride. Some literature data are also examined. Most data can be consistently explained on the basis of the molecular structures, the sensitivity increasing with the capability of the solute to rapidly communicate the absorbed energy to the solvent molecules.
Zīmola "Andele Mandele" komunikācija un tās vērtējums
2017
Bakalaura darba nosaukums ir “Zīmola “Andele Mandele” komunikācija un tās vērtējums”. Pētījuma laikā tiek apskatīta zīmola Andele Mandele komunikācija un vērtēti ar to saistīti aspekti. Darba mērķis ir novērtēt zīmola Andele Mandele komunikāciju un lietotāju iesaistīšanos zīmola veidošanā, kā arī komunikācijas uztveri auditorijā. Pētījuma laikā izmantotas kvalitatīvās un kvantitatīvās pētniecības metodes, lai iegūtie dati tiktu savstarpēji papildināti. Darba gaitā veikta daļēji strukturēta intervija, aptauja, fokusa grupas diskusija un sekundāro datu analīze. Bakalaura darbs sastāv no trīs daļām: teorētiskā pamatojuma, izstrādātas pētījuma metodoloģijas un empīriskās daļas. Nobeigumā autore…
Effect of laboratory procedures on the integrity of a sandy-loam soil sample for bi-directional measurement of saturated hydraulic conductivity
2011
Practical and validated methods to measure anisotropy of saturated, Ks, or field-saturated, Kfs, soil hydraulic conductivity on a single soil sample are still lacking. The objective of this investigation was to test factors affecting anisotropy measured in a sandy-loam soil by the constant-head laboratory permeameter and the modified cube method. The ratio, RK, between the conductivity results obtained with a long (6 h) and a short (0.5 h) duration run varied from a minimum of 0.29 to a maximum of 0.88 with the considered experimental procedure, differing by both the employed constant-head device (Mariotte bottle, siphon) and the initial soil water content (unsaturated, saturated). Maximum …
Farmed Gilthead Sea Bream (Sparus aurata) by-Products Valorization: Viscera Oil ω-3 Enrichment by Short-Path Distillation and In Vitro Bioactivity Ev…
2021
This study shows a pilot scale protocol aimed to obtain an omega 3-enriched oil after the processing of farmed gilthead sea bream viscera (SBV)
Antioxidant activity and fatty acids quantification in Sicilian purslane germplasm
2019
Portulaca oleracea is an annual succulent herb in the family Portulacaceae. It is a nutritious vegetable with high antioxidant properties and, it is among the richest plant source of ω-3 fatty acids, as well as a rich source of ω-6 fatty acids, ascorbic acid, tocopherols and beta-carotene. In the present study, three purslane populations under different Mediterranean environmental conditions for two years, for future valorization as novel food sources of omega-3 fatty acids, were evaluated. In particular, biomorphological characteristics, total phenols and fatty acids content were determined. The antioxidant activities were evaluated using 2,2-diphenyl-1-picrylhydrazyl assay. The population…
Low and very low density lipoprotein composition and resistance to copper-induced oxidation are not notably modified in smokers.
1997
To study whether tobacco use was associated with oxidative phenomena affecting lipoproteins, we estimated susceptibility of LDL and VLDL to an in vitro copper-mediated oxidation, and measured serum autoantibody titers against oxidized LDL in 45 middle-age healthy nonsmokers, 35 smokers and 37 ex-smokers of both sexes, taking into account the detailed lipid composition of the lipoproteins. VLDL from female smokers had higher triglyceride, phospholipid, apolipoprotein E and alpha-tocopherol content and showed a higher rate of copper-induced oxidation in comparison with those from nonsmokers (P < or = 0.05) whereas the relative composition of these particles in saturated, mono- or poly-unsatur…
Inhibition of endocannabinoid-degrading enzyme fatty acid amide hydrolase increases atherosclerotic plaque vulnerability in mice
2013
The role of endocannabinoids such as anandamide during atherogenesis remains largely unknown. Fatty acid amide hydrolase (FAAH) represents the key enzyme in anandamide degradation, and its inhibition is associated with subsequent higher levels of anandamide. Here, we tested whether selective inhibition of FAAH influences the progression of atherosclerosis in mice. Selective inhibition of FAAH using URB597 resulted in significantly increased plasma levels of anandamide compared to control, as assessed by mass spectrometry experiments in mice. Apolipoprotein E-deficient (ApoE(-/-)) mice were fed a high-fat, cholesterol-rich diet to induce atherosclerotic conditions. Simultaneously, mice recei…
Kriminālvajāšanas būtība un saturs
2017
Kriminālvajāšana ir kriminālprocesa obligāta stadija, kura ietilpst pirmstiesas procesā. Kriminālvajāšanas stadijā krimināllieta tiek sagatavota izskatīšanai tiesā. Tās būtība atspoguļojas lēmumā par personas saukšanu pie kriminālatbildības jeb apsūdzībā. Jo pats lēmums ir šīs apsūdzības ārējā forma, taču apsūdzības saturs ir tas, kas nosaka kriminālvajāšanas būtību. Apsūdzība ļauj noteikt pierādīšanas priekšmetu un robežas, atbilstoši realizēt tiesības uz aizstāvību. Darba mērķis bija izpētīt pirmstiesas procesa stadiju – kriminālvajāšanu. Noskaidrot, ko sevī ietver lēmums par personas saukšanu pie kriminālatbildības, apsūdzētā statusu, viņa tiesības un pienākumus. Darba gaitā tika apskatī…
Identification of the Parameters of Reduced Vector Preisach Model by Neural Networks
2008
This paper presents a methodology for identifying reduced vector Preisach model parameters by using neural networks. The neural network used is a multiplayer perceptron trained with the Levenberg-Marquadt training algorithm. The network is trained by some hysteresis data, which are generated by using reduced vector Preisach model with preassigned parameters. It is shown how a properly trained network is able to find the parameters needed to best fit a magnetization hysteresis curve.