Bulletin of the Polish Academy of Sciences-Technical Sciences最新文献

148440 148440

4区工程技术

Bulletin of the Polish Academy of Sciences-Technical Sciences Pub Date : 2023-11-15 DOI: 10.24425/bpasts.2024.148440

引用次数: 0

148439 148439

4区工程技术

Bulletin of the Polish Academy of Sciences-Technical Sciences Pub Date : 2023-11-15 DOI: 10.24425/bpasts.2023.148439

引用次数: 0

Road vehicle sequencing problem in a railroad intermodal terminal – simulation research 铁路多式联运码头道路车辆排序问题的仿真研究

IF 1.2 4区工程技术

Bulletin of the Polish Academy of Sciences-Technical Sciences Pub Date : 2023-11-06 DOI: 10.24425/BPASTS.2020.134643

M. Jacyna, R. Jachimowski, E. Szczepański, M. Izdebski

{"title":"Road vehicle sequencing problem in a railroad intermodal terminal – simulation research","authors":"M. Jacyna, R. Jachimowski, E. Szczepański, M. Izdebski","doi":"10.24425/BPASTS.2020.134643","DOIUrl":"https://doi.org/10.24425/BPASTS.2020.134643","url":null,"abstract":"The paper presents the issue of container handling processes at a railroad intermodal terminal. The main purpose of this paper is the assessment of the handling equipment utilization and the associated energy consumption. The authors analyze how the road vehicle availability at the moment specified in the containers loading schedule influences the total handling equipment operation time as well as the necessary number of handling equipment. It is assumed that vehicles planned for loading of import containers may be late for loading, which causes some interruptions in the loading schedule. Such interruptions are identified with the necessity to handle the next container for which the road vehicle is already waiting, which influences the handling equipment utilization and, finally, energy consumption. The general mathematical model of the problem developed in the FlexSim simulation software was presented. Based on the simulation research, it pointed out that proper road vehicles loading sequencing can significantly reduce handling equipment operation time, and thus energy consumption, costs, and CO2 emissions. The literature analysis presented in the paper indicates that most of the research in the field of intermodal transport is focused on operations optimization in container ports. There are differences between two types of intermodal terminals in operation procedures and rules. That is why the authors decided to undertake the problem of road vehicle sequencing including their random availability and its influence on handling device operation time, which has not been considered in the literature so far.","PeriodicalId":55299,"journal":{"name":"Bulletin of the Polish Academy of Sciences-Technical Sciences","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75844581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

A practical approach to optimal strategies of electricity contracting from Hybrid Power Sources 混合电源电力承包最优策略的实用方法

IF 1.2 4区工程技术

Bulletin of the Polish Academy of Sciences-Technical Sciences Pub Date : 2023-11-06 DOI: 10.24425/BPASTS.2020.135377

P. Marchel, J. Paska, K. Pawlak, Krzysztof Zagrajek

{"title":"A practical approach to optimal strategies of electricity contracting from Hybrid Power Sources","authors":"P. Marchel, J. Paska, K. Pawlak, Krzysztof Zagrajek","doi":"10.24425/BPASTS.2020.135377","DOIUrl":"https://doi.org/10.24425/BPASTS.2020.135377","url":null,"abstract":"Hybrid Power Sources/Systems (HPS) are generally treated as local prosumer supplies. The paper presents a new approach to the strategy of electricity contracting from HPS, considering hybrid systems as a new type of quasi-centrally dispatched power units operating in Polish market conditions. The possibilities of contracting electricity from HPS, consisting of three electricity generation technologies: biogas plant, wind power plant and solar power plant, are presented. The opportunity to obtain additional income from the electricity trading on the balancing market was used. Proposals for a new mathematical description of HPS topology were also presented, including a feasibility function, which can be used for technical and economic analyses. The obtained results can be used as a direction of development in the field of optimization of hybrid source operation in cooperation with the power grid. Based on the conducted analyses, it can be observed that electricity sales contracts concluded for each hour of the day may bring additional profit for the investor. However, the strong dependence of the proposed strategy on the situation on the balancing market or other local electricity markets similar in their operations should be emphasized.","PeriodicalId":55299,"journal":{"name":"Bulletin of the Polish Academy of Sciences-Technical Sciences","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74524972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Enhancement of COVID-19 symptom-based screening with quality-based classifier optimisation 以基于质量的分类器优化加强COVID-19症状筛查

IF 1.2 4区工程技术

Bulletin of the Polish Academy of Sciences-Technical Sciences Pub Date : 2023-11-06 DOI: 10.24425/bpasts.2021.137349

M. Kozielski, J. Henzel, J. Tobiasz, A. Gruca, P. Foszner, J. Żyła, M. Bach, A. Werner, J. Jaroszewicz, J. Polańska, M. Sikora

{"title":"Enhancement of COVID-19 symptom-based screening with quality-based classifier optimisation","authors":"M. Kozielski, J. Henzel, J. Tobiasz, A. Gruca, P. Foszner, J. Żyła, M. Bach, A. Werner, J. Jaroszewicz, J. Polańska, M. Sikora","doi":"10.24425/bpasts.2021.137349","DOIUrl":"https://doi.org/10.24425/bpasts.2021.137349","url":null,"abstract":"Efforts of the scientific community led to the development of multiple screening approaches for COVID-19 that rely on machine learning methods. However, there is a lack of works showing how to tune the classification models used for such a task and what the tuning effect is in terms of various classification quality measures. Understanding the impact of classifier tuning on the results obtained will allow the users to apply the provided tools consciously. Therefore, using a given screening test they will be able to choose the threshold value characterising the classifier that gives, for example, an acceptable balance between sensitivity and specificity. The presented work introduces the optimisation approach and the resulting classifiers obtained for various quality threshold assumptions. As a result of the research, an online service was created that makes the obtained models available and enables the verification of various solutions for different threshold values on new data. © 2021 The Author(s).","PeriodicalId":55299,"journal":{"name":"Bulletin of the Polish Academy of Sciences-Technical Sciences","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68945679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Influence of contact gaps on the conditions of vehicles supply and wear and tear of catenary wires in a 3 kV DC traction system 3kv直流牵引系统接触间隙对车辆供电条件及接触网导线磨损的影响

IF 1.2 4区工程技术

Bulletin of the Polish Academy of Sciences-Technical Sciences Pub Date : 2023-11-06 DOI: 10.24425/BPASTS.2020.133373

T. Maciołek, M. Lewandowski, A. Szeląg, M. Steczek

引用次数: 2

Active-controlled two-terminal network implementing a convolution-type immittance operator 实现卷积型阻抗算子的有源控制双端网络

IF 1.2 4区工程技术

Bulletin of the Polish Academy of Sciences-Technical Sciences Pub Date : 2023-11-06 DOI: 10.24425/BPASTS.2020.134663

M. Siwczyński, M. Jaraczewski

引用次数: 1

Static load test curve analysis based on soil field investigations 基于土壤现场调查的静载试验曲线分析

IF 1.2 4区工程技术

Bulletin of the Polish Academy of Sciences-Technical Sciences Pub Date : 2023-11-06 DOI: 10.24425/BPAS.2019.128607

P. Siemaszko, Z. Meyer

引用次数: 9

The performance of passive methods of detecting island operation implemented in PV inverters during selected disturbances in distribution power grids 研究了光伏逆变器在配电网干扰条件下孤岛运行的被动检测方法的性能

IF 1.2 4区工程技术

Bulletin of the Polish Academy of Sciences-Technical Sciences Pub Date : 2023-11-06 DOI: 10.24425/BPASTS.2020.134658

M. Parol, M. Połecki

{"title":"The performance of passive methods of detecting island operation implemented in PV inverters during selected disturbances in distribution power grids","authors":"M. Parol, M. Połecki","doi":"10.24425/BPASTS.2020.134658","DOIUrl":"https://doi.org/10.24425/BPASTS.2020.134658","url":null,"abstract":"Distributed generation is an issue intensively studied in recent years. It concerns, among others protection systems of distributed generation units connected to electric power grids. The main goal of this paper is to present the issue of functional reliability of selected passive loss of mains (LoM) protection systems, i.e. methods of detecting island operation in distribution power grids, which are implemented in PV inverters installed in sample MV and LV grids, typical for Polish conditions. First, different methods of detecting island operation have been distinguished and shortly characterized. Some problems concerning their action have also been presented. Then commonly used passive methods of island grid operation detection have been described. Next sample distribution grid has been presented and chosen disturbances modelled in the grid to test mentioned passive methods have been defined. For each of the determined type of disturbance the dynamic simulation has been carried out, as well as voltage and frequency plots for two selected RES nodes have been recorded and observed. All considered passive methods of island grid operation detection have been implemented in a Matlab/Simulink environment. Models of RoCoF, U/OVP and U/ OFP algorithms have been presented in diagrams. Then, results of carried out extensive studies have been shown in tables and discussed. The results are a consequence of a realized research project concerning electric grids in rural areas. Summary, final conclusions, and future research possibilities constitute the last part of the paper. The conclusions are mainly concentrated on evaluation of action of passive methods of island operation detection as well as possibility of using the methods in Polish conditions, particularly in rural distribution grids.","PeriodicalId":55299,"journal":{"name":"Bulletin of the Polish Academy of Sciences-Technical Sciences","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81628002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Thulium-doped optical fibers for fiber lasers operating at around 2 µm 掺铥光纤用于工作波长在2µm左右的光纤激光器

IF 1.2 4区工程技术

Bulletin of the Polish Academy of Sciences-Technical Sciences Pub Date : 2023-11-06 DOI: 10.24425/BPASTS.2019.130883

I. Kašík, M. Kamrádek, J. Aubrecht, P. Peterka, O. Podrazký, J. Cajzl, J. Mrázek, P. Honzátko

{"title":"Thulium-doped optical fibers for fiber lasers operating at around 2 µm","authors":"I. Kašík, M. Kamrádek, J. Aubrecht, P. Peterka, O. Podrazký, J. Cajzl, J. Mrázek, P. Honzátko","doi":"10.24425/BPASTS.2019.130883","DOIUrl":"https://doi.org/10.24425/BPASTS.2019.130883","url":null,"abstract":". The paper deals with spectral and lasing characteristics of thulium-doped optical fibers fabricated by means of two doping techniques, i.e. via a conventional solution-doping method and via a nanoparticle-doping method. The difference in fabrication was the application of a suspension of aluminum oxide nanoparticles of defined size instead of a conventional chloride-containing solution. Samples of thulium-doped silica fibers having nearly identical chemical composition and waveguiding properties were fabricated. The sample fabricated by means of the nanoparticle-doping method exhibited longer lifetime, reflecting other observations and the trend already observed with the fibers doped with erbium and aluminum nanoparticles. The fiber fabricated by means of the nanoparticle-doping method exhibited a lower lasing threshold (by » 20%) and higher slope efficiency (by » 5% rel.). All these observed differences are not extensive and deserve more in-depth research; they may imply a positive influence of the nanoparticle approach on properties of rare-earth-doped fibers for fiber lasers.","PeriodicalId":55299,"journal":{"name":"Bulletin of the Polish Academy of Sciences-Technical Sciences","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84191368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5