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The influence of modern headlamps on the recognition of portable traffic signs and warning triangles 现代大灯对便携式交通标志和警告三角形识别的影响
Acta Polytechnica CTU Proceedings Pub Date : 2023-09-27 DOI: 10.14311/app.2023.41.0058
Martin Rak, Tereza Tmejová, Tomáš Bilík, David Jelínek, Albert Bradáč
{"title":"The influence of modern headlamps on the recognition of portable traffic signs and warning triangles","authors":"Martin Rak, Tereza Tmejová, Tomáš Bilík, David Jelínek, Albert Bradáč","doi":"10.14311/app.2023.41.0058","DOIUrl":"https://doi.org/10.14311/app.2023.41.0058","url":null,"abstract":"This article focuses on the issue of portable traffic signs and their visibility using different light sources such as halogen, Xenon, or LED. The measured values of luminance and retroreflection for each object are used to distinguish the individual results. The results show the differences between the various light sources on the visibility of the measured objects. Furthermore, from these results it is possible to evaluate portable traffic signs regarding degradation due to mechanical wear or aging.","PeriodicalId":7150,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135587296","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
Survey of user needs and the impact of parking prices on drivers’ motivation to use parking spaces in the capital city of Prague 调查用户需求和停车价格对司机使用首都布拉格停车位动机的影响
Acta Polytechnica CTU Proceedings Pub Date : 2023-09-27 DOI: 10.14311/app.2023.41.0028
Kristýna Navrátilová, David Lehet, Eva Hajčiarová
{"title":"Survey of user needs and the impact of parking prices on drivers’ motivation to use parking spaces in the capital city of Prague","authors":"Kristýna Navrátilová, David Lehet, Eva Hajčiarová","doi":"10.14311/app.2023.41.0028","DOIUrl":"https://doi.org/10.14311/app.2023.41.0028","url":null,"abstract":"The paper deals with the possibilities of implementing dynamic tariff regulation of on-street parking spaces in the capital city of Prague. Achieving optimal results is conditioned by the implementation of advanced technologies, but at the same time, the dynamic tariff regulation must follow the applicable legislation and, above all, be accepted by drivers. For this reason, the paper briefly discusses the technical and legislative possibilities of implementation, and most attention is paid to the conducted survey of user needs. The survey investigates the impact of parking prices on drivers’ motivation to park their vehicles in the area.","PeriodicalId":7150,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135587303","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
Dependence of mechanical and thermal properties on the composition of lightweight gypsum composites 轻量化石膏复合材料的力学和热性能与组成的关系
Acta Polytechnica CTU Proceedings Pub Date : 2023-07-24 DOI: 10.14311/app.2023.40.0088
H. Sekavová, Z. Prošek, P. Tesárek
{"title":"Dependence of mechanical and thermal properties on the composition of lightweight gypsum composites","authors":"H. Sekavová, Z. Prošek, P. Tesárek","doi":"10.14311/app.2023.40.0088","DOIUrl":"https://doi.org/10.14311/app.2023.40.0088","url":null,"abstract":"One of the ways to use the treated gypsum waste is in gypsum mixtures for the production of gypsum blocks. Gypsum blocks can be used in standard interior as well as exterior applications and are made of gypsum, water, PP microfibres and are lightened with foam, which is created from a foaming additive and water. Above all, the amount of foam significantly influences the bulk density of the resulting material, and the bulk density then has a major influence on the mechanical and thermal properties. The use of PP microfibres had a positive effect on the overall stability of the foamed structure, which resulted in an increase in compressive strength while maintaining good thermal insulation properties.","PeriodicalId":7150,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72660691","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
Analysis of tunnel excavation based on linear DFN-FEM modelling 基于线性DFN-FEM模型的隧道开挖分析
Acta Polytechnica CTU Proceedings Pub Date : 2023-07-24 DOI: 10.14311/app.2023.40.0061
Martin Lebeda, P. Kabele
{"title":"Analysis of tunnel excavation based on linear DFN-FEM modelling","authors":"Martin Lebeda, P. Kabele","doi":"10.14311/app.2023.40.0061","DOIUrl":"https://doi.org/10.14311/app.2023.40.0061","url":null,"abstract":"Simulations of tunnel excavations have to take into account the natural occurrence of joints and faults in the surrounding rock mass, which dominantly control its mechanical response. In this paper, we present work in progress toward 3D finite element analysis of excavation using equivalent rock-mass properties derived from stochastically generated discrete fracture networks (DFNs). The equivalent stiffness is determined by volume averaging. Presently, we solve the problem linearly for an incremental change of the stress state. The fracture’s stiffness is assumed to depend on the initial normal stress acting in direction normal to it. However, within the solved incremental step, we assume the fracture’s stiffness to be constant. This assumption is acceptable for small stress changes. Since the fractures represented in the DFN model have preferred directions, the equivalent stiffness is anisotropic.","PeriodicalId":7150,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86004495","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
The footbridge Jesípek – application of radar interferometry for dynamic response evaluation 人行天桥Jesípek -雷达干涉法在动态响应评价中的应用
Acta Polytechnica CTU Proceedings Pub Date : 2023-07-24 DOI: 10.14311/app.2023.40.0008
Miroslav Čáp, M. Polak, T. Plachý, M. Talich, Jan Havrlant, Lubomír Soukup, F. Antoš
{"title":"The footbridge Jesípek – application of radar interferometry for dynamic response evaluation","authors":"Miroslav Čáp, M. Polak, T. Plachý, M. Talich, Jan Havrlant, Lubomír Soukup, F. Antoš","doi":"10.14311/app.2023.40.0008","DOIUrl":"https://doi.org/10.14311/app.2023.40.0008","url":null,"abstract":"Recent advances in radar systems have led to the development of radar interferometry (RI) methods for contactless vibration monitoring of large-scale structures, i.e. bridges, water tower reservoirs, and factory chimneys. Interferometric radars are devices capable to measure with 200 Hz sampling frequency and relative movement precision of 0.1 mm up to 0.01 mm. The major part of this paper describes an in-situ footbridge experiment near Hradec Králové. Radar interferometry devices were deployed along with ordinary techniques compounded by accelerometers, wiring, and acquisition station. Experiment was focused on the evaluation of basic dynamic structural properties such as natural frequencies and mode shapes. A lot of attention was also given to the result comparison of these measurement methods. Test results have confirmed the applicability of RI for bridge vibration monitoring.","PeriodicalId":7150,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87669751","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
Experimental analysis of the railway truss bridge using modern methods 用现代方法对铁路桁架桥进行试验分析
Acta Polytechnica CTU Proceedings Pub Date : 2023-07-24 DOI: 10.14311/app.2023.40.0039
Petra Kálalová, M. Polak, V. Stančík
{"title":"Experimental analysis of the railway truss bridge using modern methods","authors":"Petra Kálalová, M. Polak, V. Stančík","doi":"10.14311/app.2023.40.0039","DOIUrl":"https://doi.org/10.14311/app.2023.40.0039","url":null,"abstract":"Experimental analyses of civil engineering structures have been carried out for decades. While in the past, mainly static load tests of new structures were performed, a few severe accidents with fatal results caused a lot of emphasis to be given to monitoring existing structures recently. The need for continuous or periodical evaluation of static or dynamic behaviour of structures in operation led to a good progress in the development of modern methods for experimental analysis. The paper deals with one of the modern methods of experimental analysis – the DIC method. Possible application of the DIC method was verified by an experimental analysis of a railway truss bridge in Rataje nad Sázavou. The experiment was divided into two stages. During the experiment, deflections of the bridge measured by LVDT sensors and the DIC method were compared. Technological problems of the DIC method were found in the first stage. One of the problems was related to stability of the camera tripod. A solution was proposed and verified during the second stage.","PeriodicalId":7150,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89427534","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
Measurement and evaluation of cement paste porosity by electrochemical impedance spectroscopy 电化学阻抗谱法测定和评价水泥浆体孔隙度
Acta Polytechnica CTU Proceedings Pub Date : 2023-07-24 DOI: 10.14311/app.2023.40.0015
J. Chalupová, J. Němeček, V. Hybášek, V. Pommer, J. Němeček
{"title":"Measurement and evaluation of cement paste porosity by electrochemical impedance spectroscopy","authors":"J. Chalupová, J. Němeček, V. Hybášek, V. Pommer, J. Němeček","doi":"10.14311/app.2023.40.0015","DOIUrl":"https://doi.org/10.14311/app.2023.40.0015","url":null,"abstract":"Porosity is an important part of cement paste microstructure, which significantly influences the mechanical properties (especially durability and strength) of cement-based materials. Electrochemical impedance spectroscopy (EIS) is a non-destructive method used to measure the pore system utilizing a range of frequencies of electric current, which is fed to the cement paste by stainless steel electrodes. The pore volume is obtained from the pore resistance and the matrix capacitance measured by EIS. This paper deals with the evaluation of porosity based on resistance values from EIS on a sample of pure CEM I 42.5R Portland cement paste at 3 different hydration times (age 7, 14, 28 days).","PeriodicalId":7150,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91011924","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
Bar-supported and unsupported dental implants: a QCT-FEA study in human maxilla 棒支撑和无支撑种植体:人类上颌的QCT-FEA研究
Acta Polytechnica CTU Proceedings Pub Date : 2023-07-24 DOI: 10.14311/app.2023.40.0083
L. Řehounek, A. Jíra
{"title":"Bar-supported and unsupported dental implants: a QCT-FEA study in human maxilla","authors":"L. Řehounek, A. Jíra","doi":"10.14311/app.2023.40.0083","DOIUrl":"https://doi.org/10.14311/app.2023.40.0083","url":null,"abstract":"Two variants of implant-supported overdentures (IODs) were investigated by quantitative computed tomography-assisted finite element method (QCT-FEA) on a patient-specific CTreconstructed model of human maxilla. The analyzed variants are bar-supported (splinted) and unsupported (unsplinted) implant assemblies. The loading was done by a 800 N force slanted by 30° in the buccolingual direction. The results of the analyses show favorable stress distributions for the bar-supported variant.","PeriodicalId":7150,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77226457","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
The influence of lithium water glass on the durability of concrete 锂水玻璃对混凝土耐久性的影响
Acta Polytechnica CTU Proceedings Pub Date : 2023-07-24 DOI: 10.14311/app.2023.40.0098
Klára Vašířová, J. Fládr
{"title":"The influence of lithium water glass on the durability of concrete","authors":"Klára Vašířová, J. Fládr","doi":"10.14311/app.2023.40.0098","DOIUrl":"https://doi.org/10.14311/app.2023.40.0098","url":null,"abstract":"The aim of the research is to verify the effect of lithium water glass on the durability and reduction of concrete absorption. For this purpose, the absorption test was made and the influence of the impregnation agent on durability when the test specimens are exposed to cyclic freezing and thawing was verified. Finally, the permeability of the test specimens was measured before and after impregnation. On the basis of the tests carried out, the effect of the impregnation agent was determined by comparing impregnated test specimens with reference specimens.","PeriodicalId":7150,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85840969","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
Extracting general knowledge of model parameters for clays out of numerous laboratory tests 从大量的实验室试验中提取粘土模型参数的一般知识
Acta Polytechnica CTU Proceedings Pub Date : 2023-07-24 DOI: 10.14311/app.2023.40.0076
Veronika Pavelcová, T. Janda
{"title":"Extracting general knowledge of model parameters for clays out of numerous laboratory tests","authors":"Veronika Pavelcová, T. Janda","doi":"10.14311/app.2023.40.0076","DOIUrl":"https://doi.org/10.14311/app.2023.40.0076","url":null,"abstract":"This paper is concerned with the process of determining the material parameters of advanced constitutive models for clays. Provided results are applicable already in the early stages of geotechnical survey when no detailed data from laboratory tests of soils expected at construction site are known. A worldwide database of laboratory tests obtained during four year operation of web calibration application ExCalibre was used for this purpose. This application allows automatic calibration of three advanced constitutive soil models based on detailed data from triaxial and edometric tests. The paper describes the process of determining the confidence intervals of each material parameter of modified Cam-clay and hypoplastic clay models for low (CL) and high (CH) plasticity clay according to unified soil classification system (USCS) and tabulates their typical ranges. The purpose of presented work was to contribute to the use of advanced constitutive models among practical engineers.","PeriodicalId":7150,"journal":{"name":"Acta Polytechnica CTU Proceedings","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76730213","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
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