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showing 10 items of 2193 documents
The endogenous retroviral insertion in the human complement C4 gene modulates the expression of homologous genes by antisense inhibition
2001
Intron 9 contains the complete endogenous retrovirus HERV-K(C4) as a 6.4-kb insertion in 60% of human C4 genes. The retroviral insertion is in reverse orientation to the C4 coding sequence. Therefore, expression of C4 could lead to the transcription of an antisense RNA, which might protect against exogenous retroviral infections. To test this hypothesis, open reading frames from the HERV sequence were subcloned in sense orientiation into a vector allowing expression of a beta-galactosidase fusion protein. Mouse L cells which had been stably transfected with either the human C4A or C4B gene both carrying the HERV insertion (LC4 cells), and L(Tk-) cells without the C4 gene were transiently tr…
Ei vähä mitään
2021
Decoupled control scheme of grid-connected split-source inverters
2017
Grid-connected power conversion systems for renewable energy sources must fulfill several requirements, e.g., the high efficiency, the reduced cost and complexity, and, quite often, the boost capabilities that is usually achieved using a front-end dc–dc boost converter before the inversion stage, leading to a two-stage architecture. Meanwhile, single-stage power conversion systems, which perform the boosting operation within the inversion one, offer some potential advantages, in terms of reducing the complexity and the volume of the whole system. Among several proposed options, the split-source inverter (SSI) has been recently proposed by Abdelhakim et al. as an alternative option with some…
University students’ (dis)engagement experiences in synchronous sessions during the COVID-19 pandemic
2022
In the past two years, student engagement in online learning situations has become a mutual concern for educators all over the world. The impact of working in online environments and using video and other communication channels on students’ learning experiences is still not fully understood. The present study addresses this question by drawing on students’ written reflections and interviews from the Finnish higher education context collected during the COVID-19 pandemic. It uses the qualitative method of thematic analysis to investigate students’ experiences of interacting in synchronous sessions and their perceptions on (dis)engagement. The analysis shows the importance of versatile teachi…
An IPMSM torque/weight and torque/moment of inertia ratio optimization
2014
In this paper, a torque/weight and torque/moment of inertia ratio optimization procedure for interior permanent magnet syncronous motors (IPMSMs) is presented. More in detail, a performance comparison between several IPMSM rotor structures has been carried out in order to determine the optimum geometry that can maximize the torque/weight and torque/moment of inertia ratios. A commercial motor, with known electrical and mechanical characteristics, has been taken as reference. Its rotor structure has been modified several times, obtaining different rotor geometries and, therefore, many IPMSM models with different electrical and mechanical characteristics. The finite element method (FEM) analy…
Terrestrial carbohydrates support freshwater zooplankton during phytoplankton deficiency
2016
Article
Profesors Igors Danilāns: biobibliogrāfiskais rādītājs
2000
Biobibliogrāfiskajā rādītājā ietverti profesora Igora Danilāna publicētie darbi no 1955.gada līdz 1999.gada jūnijam, kā arī literatūra par viņu.
Zemes dzīļu bagātības Latvijā: ĢIPŠAKMENS
2020
Buklets "Zemes dzīļu bagātības Latvijā: ĢIPŠAKMENS" iepazīstina ar vienu no Latvijas vērtīgākajiem un perspektīvākajiem dabas resursiem, tā daudzveidīgajiem paveidiem. Iekļauta informācija par ģipšakmens atklāšanas vēsturi, mūsdienās nozīmīgākajām pētītajām atradnēm. Bukletu ilustrē Latvijas Universitātes Muzeja Ģeoloģijas kolekciju ģipšakmens paraugu fotogrāfijas.
Исследования древних карт республик Прибалтики
1989
В статьях сборника охарактеризованы коллекции древних карт университетов, архивов и музеев Прибалтийских республик, а также Государственного архива Швеции. Намечены основные проблемы научных исследований по древним картам.