Latvian Journal of Physics and Technical Sciences最新文献_第9页

Energy Performance Aspects of Residential Buildings in Latvia 拉脱维亚住宅建筑的能源性能

IF 0.6

Latvian Journal of Physics and Technical Sciences Pub Date : 2023-02-01 DOI: 10.2478/lpts-2023-0004

A. Kundziņa, I. Geipele, M. Auders, S. Lapuķe

{"title":"Energy Performance Aspects of Residential Buildings in Latvia","authors":"A. Kundziņa, I. Geipele, M. Auders, S. Lapuķe","doi":"10.2478/lpts-2023-0004","DOIUrl":"https://doi.org/10.2478/lpts-2023-0004","url":null,"abstract":"Abstract Measures on increasing energy efficiency is a way for ensuring sustainable energy supply, reducing emission of gases causing the greenhouse effect, improving safety of energy supply, decreasing dependence on import of energy and promoting the EU competitiveness. Improvement of energy performance of buildings as a direction of activities is provided in national policy planning documents of major importance such as the National Energy and Climate Plan for 2021–2030 and the Strategy of Latvia for the Achievement of Climate Neutrality by 2050. Residential buildings form a considerable part of the total Latvian housing stock – 27 % according to the number of buildings and 44 % according to their area. Therefore, the increase of energy performance of residential buildings is very significant for achieving the national energy saving targets, i.e. a cumulative savings of final energy consumption of about 6 PJ by 2030. The research analyses the sector of residential buildings, their statistical data, the energy consumption and requirements of the energy performance standards. To characterise this sector more comprehensively, information has been evaluated on energy performance certificates of residential buildings issued during the period from 2016 to 2021, allowing the authors to make general conclusions on the energy performance level of residential buildings and to provide proposals for increasing their energy efficiency.","PeriodicalId":43603,"journal":{"name":"Latvian Journal of Physics and Technical Sciences","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41870747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Isothermal Mechanical Cycling of Saponite–Titanium Composites in Conditions of Complex Stressed State 复合应力状态下皂石-钛复合材料等温力学循环研究

IF 0.6

Latvian Journal of Physics and Technical Sciences Pub Date : 2022-12-01 DOI: 10.2478/lpts-2022-0043

N.M. Нuliieva, V. Pasternak

引用次数: 0

Statistical Modelling of Factors Influencing the Agricultural Land Market in Ukraine 乌克兰农业土地市场影响因素的统计模型

IF 0.6

Latvian Journal of Physics and Technical Sciences Pub Date : 2022-12-01 DOI: 10.2478/lpts-2022-0047

Y. Lazebnyk, O. Korepanov, T. Chala, G. Korepanov, D. Chernenko, U. Plūmīte, M. Komlieva

{"title":"Statistical Modelling of Factors Influencing the Agricultural Land Market in Ukraine","authors":"Y. Lazebnyk, O. Korepanov, T. Chala, G. Korepanov, D. Chernenko, U. Plūmīte, M. Komlieva","doi":"10.2478/lpts-2022-0047","DOIUrl":"https://doi.org/10.2478/lpts-2022-0047","url":null,"abstract":"Abstract To make informed decisions, modern society, like modern business, must operate with adequate information about many complex interrelated aspects of its activities. Land use is only one of such aspects. Agricultural lands are of particular importance today. Land data are needed to analyse environmental processes, as well as end unsystematic, uncontrolled use of agricultural land, environmental degradation, destruction of important wetlands, loss of fish diversity and destruction of wildlife habitats. To solve these problems, it is advisable to conduct regular analysis and evaluation of land resources, justification and analysis of factors influencing the agricultural land market in the country. The tasks were solved using multidimensional statistical methods, in particular, factor analysis, which helped to get rid of subjectivity in the choice of factors influencing the market under study. Based on the model of influence of factors on the national market of agricultural land in Ukraine, six main factors were identified, the most influential of which were the components of agricultural development (first factor) and, to a lesser extent, the component of vegetable production and yield (fourth factor). The interrelationships and the degree of influence of the selected factors on the main indicators of the agricultural land market, namely, on the area of purchase and sale plots, the price of purchase and sale plots, and the number of transactions were also analysed.","PeriodicalId":43603,"journal":{"name":"Latvian Journal of Physics and Technical Sciences","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46638395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Energy Performance Aspects of Non-Residential Buildings in Latvia 拉脱维亚非住宅建筑的能源性能

IF 0.6

Latvian Journal of Physics and Technical Sciences Pub Date : 2022-12-01 DOI: 10.2478/lpts-2022-0045

A. Kundziņa, I. Geipele, S. Lapuķe, M. Auders

{"title":"Energy Performance Aspects of Non-Residential Buildings in Latvia","authors":"A. Kundziņa, I. Geipele, S. Lapuķe, M. Auders","doi":"10.2478/lpts-2022-0045","DOIUrl":"https://doi.org/10.2478/lpts-2022-0045","url":null,"abstract":"Abstract Increase of energy efficiency is Latvia’s national priority and policy instrument that allows reducing consumption of energy and costs, increasing the safety level of energy supply and reducing dependence on import. One of the trends for reducing energy consumption is to increase energy performance of buildings. In compliance with the EU and Latvian political statements, it is required to promote renovation of residential and non-residential buildings. Studies regarding energy performance aspects in the sector of non-residential buildings in Latvia are comparatively rare; however, non-residential buildings form a considerable part of the building stock, and the increase of their energy performance can bring a significant contribution in achieving the national targets. The research analyses the sector of non-residential buildings, their characteristic statistical data, energy consumption and requirements of energy performance standards. To characterise this sector more comprehensively, information on energy performance certificates of buildings issued during the period from 2016 to 2021 has been evaluated, allowing to make general conclusions on the energy performance level of different non-residential buildings and provide proposals for trends to increase their energy efficiency.","PeriodicalId":43603,"journal":{"name":"Latvian Journal of Physics and Technical Sciences","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46137938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Determining The Effect of Load on Synchronous Generator With Spark-Ignition Engine Energy Efficiency 用火花点火式发动机能效确定负载对同步发电机的影响

IF 0.6

Latvian Journal of Physics and Technical Sciences Pub Date : 2022-12-01 DOI: 10.2478/lpts-2022-0046

S. Zaichenko, A. Dychko, U. Ercetin, V. Opryshko, A. Kleshchov

引用次数: 0

DFT Simulations of ZnxMg1–XO Solid Solutions for Solar-Blind UV Sensors: Evaluation of Electronic Structure and Phase Stability 用于日盲紫外传感器的ZnxMg1–XO固溶体的DFT模拟：电子结构和相位稳定性的评估

IF 0.6

Latvian Journal of Physics and Technical Sciences Pub Date : 2022-12-01 DOI: 10.2478/lpts-2022-0042

S. Piskunov, O. Lisovski, A. Gopejenko, L. Trinkler, M. Chou, L. Chang

引用次数: 0

Complex Type II Solar Radio Event on 4 July 2022 2022年7月4日的复杂II型太阳射电事件

IF 0.6

Latvian Journal of Physics and Technical Sciences Pub Date : 2022-12-01 DOI: 10.2478/lpts-2022-0044

J. Kallunki

{"title":"Complex Type II Solar Radio Event on 4 July 2022","authors":"J. Kallunki","doi":"10.2478/lpts-2022-0044","DOIUrl":"https://doi.org/10.2478/lpts-2022-0044","url":null,"abstract":"Abstract On 4 July 2022, a complex low-frequency solar radio burst was observed in Metsähovi Radio Observatory of Aalto University. The radio burst was observed at a frequency range between 20 and 80 MHz. In GOES (Geostationary Operational Environmental Satellite) class, the event was classified as C5.1. However, coronal mass ejection (CME) was not associated to this event. The observed radio burst was a long-lasting (~10 minutes) event, and it could be mainly classified as type II solar radio event. Also type III solar events were observed before long-lasting type II event. The event includes common frequency drifting emission structures, both fundamental and harmonic structures, but also rarely observed continuum-like or stationary structure. It is assumed that the continuum-like radio emission structure is originated from the stationary flare (coronal) loop, which was visible over the whole event. The drifting emission structure means accelerated electrons, which are produced by the shock related phenomena. The paper provides the observations from this event on radio wavelength, and also soft-X-ray regime and optical wavelength (AIA 171). In addition, a possible, simplified scenario is presented for forming the drifting and continuum solar radio emissions in type II solar burst.","PeriodicalId":43603,"journal":{"name":"Latvian Journal of Physics and Technical Sciences","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47694638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fibre Optical Coupler Simulation by Comsol Multiphysics Software 用Comsol Multiphysics软件模拟光纤耦合器

IF 0.6

Latvian Journal of Physics and Technical Sciences Pub Date : 2022-10-01 DOI: 10.2478/lpts-2022-0036

E. Elsts, A. Supe, S. Spolitis, K. Zakis, S. Olonkins, A. Udalcovs, R. Murnieks, U. Seņkāns, D. Prigunovs, L. Ģēģere, K. Draguns, I. Lukoševičs, O. Ozolins, J. Grube, V. Bobrovs

引用次数: 0

Potential Decay Simulation on Insulating Films 绝缘薄膜的电位衰减模拟

IF 0.6

Latvian Journal of Physics and Technical Sciences Pub Date : 2022-10-01 DOI: 10.2478/lpts-2022-0041

S. Kasri, L. Herous, K. Smili, M. Kimour, A. Dekhane

{"title":"Potential Decay Simulation on Insulating Films","authors":"S. Kasri, L. Herous, K. Smili, M. Kimour, A. Dekhane","doi":"10.2478/lpts-2022-0041","DOIUrl":"https://doi.org/10.2478/lpts-2022-0041","url":null,"abstract":"Abstract Surface potential decay (SPD) of a corona charged polymeric material is a powerful tool to characterise electrical properties such as charge transport, trapping/detrapping and recombination. Over the years, various predictive simulation techniques have been proposed to describe charge transport within the material. Despite recent progress, it appears that there have been a few attempts to theoretically interpret the nature of the charge migration on the insulation surface. The aim of the present paper is to introduce a new technique with differential evolution algorithm (DEA) to reveal the steady state surface potential decay experimental results. Experimental measurement was carried on a thin film of polyethylene terephthalate (thickness: 0.5 mm; surface: 50 mm × 50 mm). The domains of variation of the factors used were respectively: 1000 V to 1800 V; 25 to 55 °C; 50 % to 80 %. The simulation results show that computational modelling and optimization approaches may improve the effectiveness to characterise electrical properties of polymers. More importantly, these studies demonstrate that DEA is effective and performs better than the experimental design method.","PeriodicalId":43603,"journal":{"name":"Latvian Journal of Physics and Technical Sciences","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46894570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sphere and Random Flat Surface Contact 球面和随机平面接触

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Latvian Journal of Physics and Technical Sciences Pub Date : 2022-10-01 DOI: 10.2478/lpts-2022-0037

A. Leitans, O. Liniņš

引用次数: 0