Scientific papers (IF)

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https://dspace.rta.lv/handle/20.500.12169/21

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ANALYSIS OF CONTACTLESS RADIO FREQUENCY IDENTIFICATION TECHNOLOGIES AND ITS USAGE IN REZEKNE CITY INFRASTRUCTURE OBJECTS
(2016)
Zalužinskis, Artūrs
;
Zorins, Aleksejs
Author made the analysis of usage of contactless radio frequency identification technologies in Rezekne city infrastructure objects. Author provides the main types of radio frequency hardware, working principles and worldwide usage statistics. In the conclusion of the paper, author describes the further development opportunities of the radio frequency identification technologies.
AS „OLAINFARM” SEWAGE TREATMENT PLANT EFFICIENCY IMPROVEMENT
(2017)
Grisone, Agnese
;
Teirumnieks, Edmunds
Researched the problem is that during the manufacturing process mother liquor is fed to the sewers. Then the mother liquors into the biological treatment plant. Results and evaluation are reflected in the input and output samples of waste water results in which the sample results are not following the requirements laid down. Wastewater treatment plants have been built a long time ago and need to supplement existing equipment to clean up the quality of untreated wastewater.
CARBON FIBER AND PLANT FIBER COMPOSITE TECHNOLOGY DEVELOPMENT IN HIGH STRENGH PARTS
(2017)
Pīgožnis, Kārlis
;
Teirumnieks, Edmunds
Natural abundance, low density, high strength per unit weight, and biodegradability of natural materials, specifically natural fibres, render them attractive for other reinforcements. In order to clarify the effect of natural fibers as reinforcments upon the tensile strength of polyacrylonitrile (PAN)-based carbon fibres, experimental as well as theoretical studies have been performed. A new material developing has been made in combining different fiber materials and testing them for strengh.
CLEANED WATER QUALITY IN THE EXPERIMENTAL CIRCUIT LABORATORY
(2016)
Grisone, Agnese
;
Teirumnieks, Edmunds
For the moment there is no problem, because the clean water complies with the following requirements. But it is the nature of the mechanical problems, where technical and cleaned water in the production process increased conductivity indicators and the pH value is less than the soft water after legislative dossier. Materials and methods are described in the clean water sampling physical – chemical testing, as well as describes the methods used. And you are prompted to create the electricity supply system, which, in addition to the accidental or unplanned power off position. It will depend on the results of a number of indicators. You can view a version of the technology, if not improving, the ability to create an automatic power supply system.
Construction Methods of the Decision Trees for Genetic Programming
(2008)
Grabusts, Pēteris
Mūsdienās ģenētiskās programmēšanas iespējas tiek plaši izmantotas daudzos optimizācijas un klasifikācijas uzdevumos. Lai ģenētiskās programmēšanas metodes varētu tikt veiksmīgi pielietotas, ir nepieciešams konstruēt attiecīgus lēmumu kokus. Lēmumu koki un likumi uz to pamata ir intelektuālās datu analīzes sastāvdaļa un veiksmīgi tiek pielietoti klasifikācijas problēmu risināšanā. Pastāv vesela virkne dažādu paņēmienu, kas dod iespēju konstruēt lēmumu kokus ģenētiskās programmēšanas iespēju izmantošanai. Literatūras analīze liecina, ka optimālākā metode lēmumu koku konstruēšanā sastāv no diviem etapiem. Sākotnēji tiek veidots lēmumu koks, izmantojot C4.5 algoritmu, kas turpmāk tiek izvērsts ar ģenētiskās programmēšanas operatoru palīdzību. Šajā gadījumā ģenētiskā programmēšana tiek lietota kā globāla meklēšanas stratēģija precīza lēmumu koka atrašanā. Rakstā analizētas mūsdienu pieejas lēmumu koku konstruēšanā un izskatītas ģenētiskās programmēšanas iespējas, kas tiks izmantotas turpmākajā pētnieciskajā darbībā.
DETERMINATION OF WATER POLLUTION USING SATELLITE DATA
(2017)
Kaļva, Lilita
;
Teirumnieka, Ērika
One of the major eutrophication - causing substances are all elements - phosphorus and nitrogen, which enters the surface water from agricultural areas, sewage treatment plants and other sources. Therefore, the more attention focused on the nutrient elements –phosphorus and nitrogen effects on algal growth and weight gain. In Rezekne Technology academy laboratory experiments were carried out under laboratory conditions, the algae, grown in weight gain, depending on the water temperature and nutrient concentration. Lake Burtnieks is analyzed with satellite data. The results shows that satellite data can be used for remote monitoring of bodies of water quality change and water quality forecasting.
DIGITAL TWIN: ORCHARD MANAGEMENT USING UAV
(2023)
Zarembo, Imants
;
Kodors, Sergejs
;
Apeināns, Ilmārs
;
Gunārs Lācis
;
Daina Feldmane
;
Edgars Rubauskis
Orchard management can benefit greatly from the use of modern technology to reach higher yields, decrease costs and achieve more sustainable farming. Implementation or such a smart farming approach into orchard management can be realised via application of unmanned aerial vehicles (UAV) for data collection and artificial intelligence (AI) for yield estimation and forecasting. On top of that, a digital twin of the orchard can be implemented to represent the physical system of the orchard in the digital format allowing implement modern data-driven decision-making based on fruit-growing automation.The aim of this study is to present a digital twin based on application of UAV and AI for orchard management that is being developed as part of a research project lzp-2021/1-0134. At this moment, we are developing a user-centred design which is oriented to satisfy horticulture specialists’ needs for an autonomous monitoring system and to help them in decision-making. Within the framework of this study an enterprise model of orchard management is designed, which supports the digital twin concept and provides autonomous orchard monitoring. The study is scoped with subjects: apples, pears and cherries, and yield management based on orchard monitoring using UAV.
ENERGY EFFICIENCY IMPROVEMENT PLAN
(2018)
Matulis, Jānis
;
Teirumnieka, Ērika
As climate change issues and increasing CO2 emissions are rising, "green energy" or renewable energy sources include solar, wind power, biomass, geothermal energy, etc. One of the most important sectors of the economy is energy. Its main tasks are energy recovery, its processing in all types of energy and delivery to consumers. No energy development is possible without the development of any economic sector. Energy is mainly used for energy production
FACTORS AFFECTING CEREAL GROWTH IN A FARM RATNIEKI
(2018)
Sprinģe, Zaiga
;
Teirumnieka, Ērika
Crop production is the most important crop production, since grain production contributes to the economic and political stability of any country, and the well-being of its citizens. The scientific paper summarizes information on the soil's chemical properties. Performed soil samples of the farm "Ratinieki" in the amount of soil, pH and electrical conductivity analysis of soil. On the basis of the research carried out, conclusions were made on the conditions of cereal cultivation on the holding.
FOREST QUALITY RESEARCH IN MALTA MUNICIPALITY
(2018)
Šembele, Ina
;
Teirumnieka, Ērika
The scientific article contains information about forest stands in the territory of the Malta parish. In the field studies in the plots, the quality of black alder, birch, pine and fir trees has been assessed according to the height, the average, basement area and the number of trees in the plot, and the tree stock is estimated. In general, the quality of forests in the territory of the Malta parish is considered to be good. Problems were detected in the furrows, since after removing the part of valuable materials, the furrows have left branches that are a place of pest control and a potential threat to forest stands. Areas without forest restoration were found.
FUNCTIONAL MODELLING OF IT RISK ASSESSMENT SUPPORT SYSTEM
(2011)
Teilāns, Artis
;
Andrejs Romanovs
;
Yuri Merkuryev
;
Arnis Kleins
;
Pjotrs Dorogovs
;
Ojars Krasts
Information technology systems represent the backbone of a company's operational infrastructure. A company's top management typically ensures that computer software and hardware mechanisms are adequate, functional and in adherence with regulatory guidelines and industry practices. Nowadays, due to depressed economic and increased intensity of performed operations, business highly recognizes the influence of effective Information Technology risk management on profitability. The purpose of this paper is to develop IT risks assessment systems support functional model, based on analysis of IT risks and assessment mechanisms, IT governance and risk management frameworks, functional analysis of IT risks assessment and management software, and, finally, to develop IT risk management domain specification language with a metamodel that defines an abstract UML based language for supporting model-based risk assessment. Usage of UML based domain specific language achieves synergy from in IT industry widely used UML modelling technique and the domain specific risk management extensions.
Lake blue clay - sapropel - flax shive briquettes for water absorption and desorption
(2018)
Tretjakova, Rasma
;
Martinovs, Andris
;
Avisane, M.
;
Kolčs, Guntis
Article Latvian lakes are rich in sapropel sediments and below the sapropel layer there is another valuable natural resource, namely blue clay. Flax shives are formed in large quantities as a waste in flax processing factories. The problem involves processing and rational use of these reso urces. The paper studies the obtaining of briquettes from flax shives using sapropel and lake clay as a binding material. Briquettes are intended for use in cases when problems with regular plant watering occur. For example, provision of plants with water in greenhouses, indoor spaces for a long period of time without human presence. Briquettes are placed into the soil next to the plant roots. Briquettes are initially moistened and absorb a significant amount of water (moisture content to be expressed in co mparison to the sample's dry weight 250 – 380%). The presence of clay in them contributes to slow drying of briquettes and provides a long lasting supply of moisture to the plant roots. The paper deals with the issues of the optimal composition of components and the amount of pressure for the production of briquettes, as well as water absorption and desorption properties of briquettes. The aim of the study is to develop a production method of clay – sapropel – flax shive briquettes with good water absorption and desorption properties.
Machine Learning Technology Overview In Terms Of Digital Marketing And Personalization
(2021)
Teilāns, Artis
;
Nikolajeva, Anna
The research is dedicated to artificial intelligence technology usage in digital marketing personalization. The doctoral theses will aim to create a machine learning algorithm that will increase sales by personalized marketing in electronic commerce website. Machine learning algorithms can be used to find the unobservable probability density function in density estimation problems. Learning algorithms learn on their own based on previous experience and generate their sequences of learning experiences, to acquire new skills through self-guided exploration and social interaction with humans. An entirely personalized advertising experience can be a reality in the nearby future using learning algorithms with training data and new behaviour patterns appearance using unsupervised learning algorithms. Artificial intelligence technology will create website specific adverts in all sales funnels individually.
Object-Oriented Modelling and Simulation of Large-Scale Systems
(2017)
Teilāns, Artis
;
Merkuryev, Yuri
Abstract The paper discusses a methodology of object-oriented modelling and simulation. This methodology was developed for large-scale systems modelling and simulation. From modelling point of view, presented methodology can be classified as Object-Oriented methodology, and from simulation point of view as discrete event system (DEYS) methodology.
RESERCH OF LASER MARKING CHANEL GEOMETRICAL DIMENSIONS DEPENDENCE OF CHANGE OF LASER RADIATION PARAMETERS ON STAINLESS STEEL
(2016-04-20)
Dunkins, Vitālijs
;
Komkovs, Jurijs
;
Narica, Pavels
;
Valiniks, Jānis
;
Martinovs, Andris
;
Teirumnieks, Edmunds
;
Lazov, Lyubomir
Publication describes results of the stainless steel laser marking, which shows relationship between geometry of the treated surface and parameters of the laser radiation, such as power, pulse frequency, and processing speed.
SMALL HYDROELECTRIC POWER STATION OPERATIONAL EVALUTION OF REZEKNES WASTEWATER TREATMENT PLANTS
(2016)
Lūse, Gunda
;
Teirumnieka, Ērika
In this research main purpose was to assess the operational efficiency of small hydroelectric power station in Rezekne wastewater treatmet plants and to develop situations for operating improvement. The main viewing point is the effective power generation form available sources here in Latvia. One of them is to get energy from wastewater before those enters in the nature. That means that there must be installed a small hydroelectric power station in the wastewater enters.
THE QUALITY OF WELL WATER IN THE SPRUZEVA VILLAGE
(2018)
Zeļča, Jūlija
;
Teirumnieka, Ērika
The article contains information on the water quality of Spruzeva village wells, which was determined by chemical and microbiological indicators. Methods of detection have been described. The analysis of the obtained chemical and microbiological research results and comparison with the drinking water quality targets were carried out. Since microbiological and chemical contamination has been detected in the studied wells, proposals have been made to improve water quality.
TYPE DISTRIBUTION RELATED TO PYROLYSIS TECHNOLOGY
(2018)
Meļehina, Ieva
;
Teirumnieks, Edmunds
Recycling operations for scrap tire waste are of great concern to humankind. An urgent problem today is the lack of information about the importance of recycling for climate mitigation. Every year, the sheer product of tire and its heterogeneous composition prompts people to promote the principles of new technology introduction. The study assessed the importance of processing in relation to the composition of final products obtained at the end of the pyrolysis plant's operational process. [2] During the process, four types of starprints are created, each with different functions. The resulting intermediate principles relate to energy sources and chemicals that are analyzed every time after acquisition. Tailor-made final products The goal of the work is increasingly being sought, seeking new adaptations to develop the performance of Pyrolysis reactors, which recycles end-of-life tires. Emissions of air pollutants have been evaluated. Pyrolysis final product yields with improved machine capacity.
WOOD PRODUCTS (CARTON) TREATMENT WITH LOW POWER DIODE LASER AND OPTIMIZATION OF PROCESSING PARAMETERS
(2016)
Antons, Pacejs
;
Diduhs, Artūrs
;
Novikovs, Aleksandrs
;
Narica, Pāvels
The Embalser is designed as and affordable entry-level laser cutter and engraver. Ideally suited to the hobbyist, artist and professional who is looking for a laser which is simple to use and without all the complexities of CO2 based system. The 4 watts of laser power (1/10th the power of a standard CO2 system), is more than capable of working with materials such as paper, leather and some plastis. Optimizing the parameters could succeed in improving finel result.

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