Search results for "VS."
showing 10 items of 1506 documents
Pūļa finansējums kā alternatīvās finansēšanas avots
2019
Bakalaura darba mērķis ir, pamatojoties uz literatūras, interneta resursu un aptaujas datu analīzi, izpētīt Latvijas uzņēmumu un privātpersonu iespējas piesaistīt finansējumu ar pūļa finansēšanas palīdzību, noskaidrot pieejamo finansējuma apjomu atkarībā no izvēlētās platformas, un identificēt pūļa finansēšanas platformu priekšrocības un trūkumus. Bakalaura darba pirmajā daļā tiek pētīti pūļa finansējuma veidi, ieguvumi un riski no šī alternatīvā finansēšanas veida izmantošanas, kā arī analizēta reglamentējošā bāze, kas regulē pūļa finansēšanu dažādās valstīs. Darba otrajā daļā tiek aplūkotas populārākās pūļa finansēšanas platformas pasaulē un Baltijas valstīs, un veikts to salīdzinājums. T…
Progresīvā iedzīvotāju ienākuma nodokļa ieviešanas iespējas Latvijā
2015
Bakalaura darbā pētīta progresīvā iedzīvotāju ienākumu nodokļa ieviešanas iespējas Latvijā. Nepieciešamība pēc šī nodokļa apskatīta gan no ekonomiskā, gan no sociālā viedokļa. Darba ietvaros no dažādu autoru skatupunktiem apskatīta progresīvā nodokļa būtība, tā ietekme uz ekonomiku un sabiedrību. Darba analītiskajā daļā pētīts, kā nodokļu sistēmas izmaiņas ietekmē valsti kopumā un, balstoties uz izstrādāto anketu, analizēts respondentu viedoklis par nepieciešamajām izmaiņām Latvijas nodokļu sistēmā. Darba noslēgumā ir formulēti secinājumi un priekšlikumi progresīvā iedzīvotāju ienākuma nodokļa ieviešanas nosacījumu tālākai izstrādei Latvijā.
Effect of coatings on long term behaviour of a commercial stainless steel for solid oxide electrolyser cell interconnect application in H2 /H2O atmos…
2014
Abstract K41X (AISI 441) stainless steel evidenced a high electrical conductivity after 3000 h ageing in H 2 /H 2 O side when used as interconnect for solid oxide electrolyser cells (SOEC) working at 800 °C. Perovskite (La 1 − x Sr x MnO 3 − δ ) and spinel (Co 3 O 4 ) oxides coatings were applied on the surface of the ferritic steel for ageing at 800 °C for 3000 h. Both coatings improved the behaviour of the steel and give interesting opportunities to use the K41X steel as interconnect for hydrogen production via high temperature steam electrolysis. Co 3 O 4 reduced into Co leading to a very good Area Specific Resistance (ASR) parameter, 0.038 Ω cm 2 . Despite a good ASR (0.06 Ω cm 2 ), La …
Azatruxene‐Based, Dumbbell‐Shaped, Donor–π‐Bridge–Donor Hole‐Transporting Materials for Perovskite Solar Cells
2020
Three novel donor-π-bridge-donor (D-π-D) hole-transporting materials (HTMs) featuring triazatruxene electron-donating units bridged by different 3,4-ethylenedioxythiophene (EDOT) π-conjugated linkers have been synthesized, characterized, and implemented in mesoporous perovskite solar cells (PSCs). The optoelectronic properties of the new dumbbell-shaped derivatives (DTTXs) are highly influenced by the chemical structure of the EDOT-based linker. Red-shifted absorption and emission and a stronger donor ability were observed in passing from DTTX-1 to DTTX-2 due to the extended π-conjugation. DTTX-3 featured an intramolecular charge transfer between the external triazatruxene units and the azo…
Heterovalent BiIII/PbII ionic substitution in one-dimensional trimethylsulfoxonium halide pseudo-perovskites (X = I, Br)
2021
We report on the synthesis and characterization of novel lead and bismuth hybrid (organic-inorganic) iodide and bromide pseudo-perovskites (ABX3) containing the trimethylsulfoxonium cation (CH3)3SO+ (TMSO) in the A site, Pb/Bi in the B site, and Br or I as X anions. All of these compounds are isomorphic and crystallize in the orthorhombic Pnma space group. Lead-based pseudo-perovskites consist of one-dimensional (1D) chains of face-sharing [PbX6] octahedra, while in the bismuth-based ones, the chains of [BiX6] are interrupted, with one vacancy every third site, leading to a zero-dimensional (0D) local structure based on separated [Bi2I9]3- dimers. Five solid solutions for the iodide with di…
Emaljas iekrāsošanās dzīvnieku un cilvēku zobos, izmantojot atšķirīgas kvalitātes balinātājus.
2022
Ikdienā izmantojot tumšus dzērienus un neieturot zobu higiēnu, zobu virsma var krāsoties. Zobu balināšana var ietekmēt zobu toņa krāsu, tāpēc tiek pētīta dažādu balinātāju ietekme. Darba ietvaros tika izvēlēti 29 cilvēku un 29 augstienes govs zobi. Zobu paraugi tika notīrīti un aplikti ar silikonu. Šajā pētījumā izmantoja divu veidu balinātājus – zobu higiēnista balinātāju " Opalescence boost PF 40%" un cilvēku plaši pieejamā veikalā esošo zobu pastu un gēlu ar balināšanas funkciju "Rapid White". Visi zobu paraugu toņi tika noteikti ar Lumin Vacuum universālo zobu toņu noteicēju. Zobu paraugiem “Earl Grey” melnajā tējā tika iegremdēti dažādos laika posmos – 12, 24 un 36 stundas. Četri zobi …
An Adaptive Robust Predictive Current Control for Three-Phase Grid-Connected Inverters
2011
This paper presents an adaptive robust predictive current control (RPCC) for grid-connected three-phase inverters that exhibit zero steady-state current error. The error correction is achieved by means of an adaptive strategy that works in parallel with the deadbeat algorithm, therefore preserving the typical fast response of the predictive law. The resulting control adapts to any particular L or LCL filter by estimation of the resistive part of the filter. As a variety of the RPCC class of control, it offers the best tradeoff between robustness and speed. © 2009 IEEE.
Intrusion Detection and Ejection Framework Against Lethal Attacks in UAV-Aided Networks: A Bayesian Game-Theoretic Methodology
2017
International audience; Advances in wireless communications and microelectronics have spearheaded the development of unmanned aerial vehicles (UAVs), which can be used to augment a ground network composed of sensors and/or vehicles in order to increase coverage, enhance the end-to-end delay, and improve data processing. While UAV-aided networks can potentially find applications in many areas, a number of issues, particularly security, have not been readily addressed. The intrusion detection system is the most commonly used technique to detect attackers. In this paper, we focus on addressing two main issues within the context of intrusion detection and attacker ejection in UAV-aided networks…
Economic evaluation of PV system for EV charging stations: Comparison between matching maximum orientation and storage system employment
2016
This article addresses the problem of the choice of a generation system to be implemented to reduce the impact of charging electric vehicles at University. Based on the behaviour of the student population, it is identified the electrical load. Two possible solutions are evaluated in order to manage the peak load: an orientation of the panels in order to increase the power at defined time and the use of storage system. The main strength and weakness points of two systems are investigated by taking into account the Levelized Cost of Energy.
Techno-economic analysis of a local district heating plant under fuel flexibility and performance
2017
Brovst is a small district in Denmark. This paper analyses the use of local renewable resources in the district heating systems of Brovst. The present use of fossil fuels in the Brovst district heating plant (DHP) represents an increasing environmental and climate-related load. Therefore, an investigation has been made to reduce the use of fossil fuels for district heating system and make use of the local renewable resources (biogas, solar, and heat pump) for district heating purposes. In this article, the techno-economic assessment is achieved through the development of a suite of models that are combined to give cost and performance data for this district heating system. Local fuels have …