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Computational complexity of prediction strategies
1977
The value f(m+1) is predicted from given f(1), ..., f(m). For every enumeration T(n, x) there is a strategy that predicts the n-th function of T making no more than log2(n) errors (Barzdins-Freivalds). It is proved in the paper that such "optimal" strategies require 2^2^cm time to compute the m-th prediction (^ stands for expoentiation).
78th Scientific Conference. Section: Magnetic Soft Matter: Book of Abstracts
2020
February 14th, 2020; University of Latvia. Faculty of Physics, Mathematics and Optometry; House of Science, Jelgavas 3, Riga, Latvia
E. Leitz palielināmais stikls uz statīva
2020
Raksts par palielināmajiem stikliem, mikroskopiem un optisko instrumentu ražošanas uzņēmumu "Ernst Leitz Wetzlar", kura ražotais vienkāršais sadalīšanas mikroskops nr. 46 atrodas Latvijas Universitātes Muzeja Botānikas un mikoloģijas kolekciju krājumā.
Hans Šlešs un viņa kolekcija
2021
Virtuālajā izstādē, kas veltīta malakologam Hansam Šlešam, Latvijas Universitātes Muzeja Zooloģijas kolekcijas piedāvā iespēju uzzināt par pētnieka biogrāfiju, publikācijām, zinātniskajiem sasniegumiem un Zooloģijas muzejam dāvināto gliemju čaulu paraugu kolekciju.
A study of male and female managers between economic sectors of Latvia using EU-SILC survey
2020
Gender pay difference has been a widely recognized issue worldwide and one of the most popular research topics between various researchers, as there is still a relatively low share of women representing roles in senior management. The aim of this study is to analyse recent scientific findings on wage gap between male and female managers, and to explore possible occupation segregation in Latvia, as well as employment differences between male and female managers in the context of economic sectors and salary levels. Research methods used to prepare this particular study are analysis of the following: scientific publications, statistical data obtained from the database of European Union Statist…
Grocery retail market concentration convergence in Eastern European and Baltic EU member states in 2010-2019
2021
The paper analyses market concentration development in the Chech Republic, Estonia, Hungary, Latvia, Lithuania, Poland, Slovakia and Slovenia. It is determined that these countries have a converging market concentration tendency indicating a decrease in the competition level and becoming more homogeneous. At the same time there are strong indications for market concentration being linked also to retail turnover.
Improved innovative product strategy assessment model in market research context
2019
In the innovation economy, companies more often face the need quickly and efficiently evaluate not only their existing product and service portfolios in the context of the industry’s potential, but also evaluate theoretical concepts of innovations. There are various systems for evaluating innovation concepts and already existing products and/or services for companies that are planning to expand their business in a new industry. The innovation economy is characterized by the convergence of innovations and the most demanded products on the market with continuous market upgrades. A company which wants to grow in a new industry faces an assessment challenge between already existing, demanded pr…
On the Way to Optoionics
2020
Discussions with Michael Grätzel, Ursula Röthlisberger, Robert A. Evarestov and Bettina V. Lotsch are gratefully acknowledged.
The Influence of Civic and Citizenship Education Achievements on the Development of Students' Citizenship Attitudes
2013
Civic skills, knowledge and attitudes are the elements forming the citizenship concept. How do they suit multicultural societies? What are the mutual links among civic attitudes, knowledge and skills of different ethnic groups? The aim of the research is to establish the model of students’ civic competence and to find out factors which explain the influence of civic achievements on civic attitudes. IEA (the International Association for the Evolution of Educational Achievement) ICCS 2009 (the International Civic and Citizenship Studies 2009) are used for the analysis. SEM (Structural Equation Modelling) is used for data processing. The authors used multi-modelling to compare Latvian and Est…
Prevalence estimation of celiac disease in the general adult population of Latvia using serology and HLA genotyping
2015
Background: Prevalence estimates for celiac disease (CD) depend on the method used. The role of deamidated gliadin peptide (DGP) and genetic testing in epidemiological studies and diagnostic settings of celiac disease (CD) has still to be established. Objectives: The objective of this article is to assess the prevalence of CD in Latvia by combining serological tests with DQ2.5/ DQ8 testing. Methods: A total of 1444 adults from a randomly selected cross-sectional general population sample were tested by ELISA for tTG IgA, DGP IgA and IgG antibodies (QUANTA Lite, Inova Diagnostics Inc). Samples with tTG IgA 20U were tested for EMA IgA by indirect immunofluorescence assay, and all specimens wi…