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Riga Technical University Repository
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3017 Publications
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  • Analysis of Using a Heliostat with Non-Rotating Solar Energy Receivers

    The use of solar energy in Northern countries is not as obviously reasonable as in the countries that are located closer to the Equator due to bigger differences of daytime during changes of seasons, as well as lower solar irradiance. This paper investigates the advantages of using a heliostat with non-rotating solar energy receivers (like water/air heating collectors, stationary PV panels or solar illumination collectors). The optimal orientation of the solar receiver and the heliostat is di...

    Feasibility Study of Inductor Coupling in Three-Level Neutral-Point-Clamped Quasi-Z-Source DC/AC Converter

    This paper presents a comparative feasibility study of coupled inductor implementation in a three-level neutral-point-clamped quasi-Z-source (3L-NPC qZS) DC/AC converter. Our theoretical verification shows that coupling of the qZS inductors enables reductions in the size and weight of the magnetic components or in the input current ripple. Our mathematical analysis shows the difference of inductor currents at variable circuit parameters. Simulations results are provide...

    Synthetic Applications of 2,6-Diazidopurine Nucleosides Leading to Modified Triazolylpurine Derivatives

    Here we report the use of 2,6-diazidopurine nucleoside in the nucleophilic aromatic substitution reactions with different S-nucleophiles. The regioselectivity of these reactions depend on the nature of the S-nucleophile. When the SNAr reaction between the diazide and cyclohexanethiol was made, the C(2)-substitution product (R = c-Hex) was obtained. It exists as a mixture of two tautomeric forms.

    Психическая надёжность спортсменов и свойства личности

    В работе исследовано влияние свойств личности на показатели психической надёжности. Выявлены основные личностные комплексы по критерию их взаимосвязи с такими компонентами психической надёжности, как стабильность и помехоустойчивость, соревновательная эмоциональная устойчивость, саморегуляция, мотивация и суммарный показатель надёжности. Показано относительно равномерное распределение типов стрессоров. При этом наиболее характерны высокие показатели суммарной чувствительности и стрессор...

    Hydrogeological Model of Water Supply System for the Prospective Factory

    Izveidots hidroģeoloģiskais modelis (HM) Latvijā plānotajai Coca Cola kompānijas rūpnīcas ūdens apgādes sistēmas ilgtspējīgas darbības novērtēšanai. HM aptver 9km10km laukumu, kurš atrodas Ropažu ciemata apkārtnē. HM sastāv no 11 slāņiem, plaknes aproksimācijas solis ir 20 metri. Lai novērtētu ūdens atsūknēšanas iespaidu uz pazemes ūdens sistēmu, tika aprēķinātas depresijas piltuves Kvartāra un Devona tipa ūdens horizontiem. Atrasts ķīmiskās aizsargjoslas novietojums. Rūpīgi izpētīts, ka nav...
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