Research Papers Faculty of Materials Science and Technology Slovak University of Technology最新文献_第4页

Reliability Assessment of the Systems with Simple Interconnections 简单互连系统的可靠性评估

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2021-09-01 DOI: 10.2478/rput-2021-0022

E. Labašová

引用次数: 0

An Approach to Automated Programming of Industrial Robots Based on Graphic Data 基于图形数据的工业机器人自动化编程方法

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2021-09-01 DOI: 10.2478/rput-2021-0026

I. Halenár, Lenka Halenárová, M. Kovacic

引用次数: 0

Initiation Parameters of Granulated Synthetic Polymers 造粒合成聚合物的起始参数

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2021-06-01 DOI: 10.2478/rput-2021-0012

P. Rantuch, J. Martinka, Tomáš Štefko, Igor Wachter

{"title":"Initiation Parameters of Granulated Synthetic Polymers","authors":"P. Rantuch, J. Martinka, Tomáš Štefko, Igor Wachter","doi":"10.2478/rput-2021-0012","DOIUrl":"https://doi.org/10.2478/rput-2021-0012","url":null,"abstract":"Abstract Polymeric materials, which are currently very often used in various industries, are often transported and stored in the form of granules before processing. This method has several advantages, but in most studies the test samples are modified to different shapes and dimensions. This paper is therefore focused on the initiation of selected granular plastics. Samples of five polymeric materials were exposed to an external heat flux from 20 kW.m−2 to 40 kW.m−2. A spark initiator was used to ignite the released gaseous products of thermal decomposition of the polymer sample. FTP (flow-time product) method was applied to the obtained parameter - time to ignition, from which other initiation parameters were determined. The critical heat flux was determined in the range of 5.0 kW.m−2 - 11.8 kW.m−2. Despite the relatively small thickness (4 mm), the samples behaved as thermally thick. During the measurement, thin surface layer melted, and the rest of the polymer remained in its original granulated form. Ignition temperatures were calculated according to the Stefan-Boltzmann’s law between 273 °C - 402 °C.","PeriodicalId":21013,"journal":{"name":"Research Papers Faculty of Materials Science and Technology Slovak University of Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79649973","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: 5

Heterogeneous Fenton-Like Oxidation of Methylene Blue Using Alternative Catalysts 替代催化剂对亚甲基蓝非均相fenton类氧化反应的研究

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2021-06-01 DOI: 10.2478/rput-2021-0009

J. Michálek, K. Domnina, Veronika Kvorková, Kristína Šefčovičová, Klaudia Mončeková, M. Soldán

引用次数: 0

Fire Growth Rate Index as a Key Fire Characteristic of Electrical Cables 火灾增长率指标作为电缆火灾的关键特性

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2021-06-01 DOI: 10.2478/rput-2021-0008

J. Martinka, P. Rantuch, Igor Wachter, Tomáš Štefko, M. Trčka, Martina Hladová, A. Nečas, Janka Sulová

{"title":"Fire Growth Rate Index as a Key Fire Characteristic of Electrical Cables","authors":"J. Martinka, P. Rantuch, Igor Wachter, Tomáš Štefko, M. Trčka, Martina Hladová, A. Nečas, Janka Sulová","doi":"10.2478/rput-2021-0008","DOIUrl":"https://doi.org/10.2478/rput-2021-0008","url":null,"abstract":"Abstract This study deals with the Fire Growth Rate Index (FIGRA) as a key fire characteristic of electrical cables (determined by a cone calorimeter) that allows to estimate their reaction to fire class. Three power (supply) electrical cables (reaction to fire class B2ca) were tested by a cone calorimeter using different heat fluxes of 20, 30, 40 a 50 kW·m−2. The cables were three-wire (cross-section of each wire was 1.5 mm2) with a nominal voltage of 0.6 kV (alternating current), resp. 1 kV (direct current). The cable sheaths were made of an ethylene copolymer filled with aluminum hydroxide. The beddings were made of an ethylene copolymer filled with a mixture of aluminum hydroxide and calcium carbonate. The conductor insulations of one electrical cable were made of crosslinked polyethylene and the conductor insulations of the other two electrical cables were made of an ethylene copolymer filled with aluminum hydroxide. FIGRA was determined per unit length and unit area of electrical cables. FIGRA increased with increasing heat flux. At a heat flux of 50 kW·m−2, all the electric cables examined showed a very similar FIGRA (from 0.19 to 0.21 kW·m−1·s−1 and 18.4 to 21.2 kW·m−1·s−1, respectively). Conversely, at a heat flux of 20 kW·m−2, the investigated cables showed greater FIGRA variance (in the range of 0.11 to 0.16 kW·m−1·s−1 or 10.8 to 16.2 kW·m−1·s−1).","PeriodicalId":21013,"journal":{"name":"Research Papers Faculty of Materials Science and Technology Slovak University of Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89420269","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

Influence of Explosion Chamber Shape on Timing Parameters of Disperser 爆炸室形状对分散器定时参数的影响

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2021-06-01 DOI: 10.2478/rput-2021-0015

Zuzana Szabová, R. Kuracina, M. Mynarz, Marián Škvarka

引用次数: 0

Determination of Timing Parameters of Dust Clouds Explosion in Dependence on the Size of the Vessel Volume 与容器容积大小相关的尘云爆炸时间参数的确定

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2021-06-01 DOI: 10.2478/rput-2021-0005

R. Kuracina, Zuzana Szabová

{"title":"Determination of Timing Parameters of Dust Clouds Explosion in Dependence on the Size of the Vessel Volume","authors":"R. Kuracina, Zuzana Szabová","doi":"10.2478/rput-2021-0005","DOIUrl":"https://doi.org/10.2478/rput-2021-0005","url":null,"abstract":"Abstract EN 14034 standard defines the requirements for igniter, to determine the properties of dust clouds. The standard specifies the conditions for occurrence of explosions of dust clouds. According to the standard, equipment with a volume of 1m3 and 20L can be used to determine the explosion parameters of dispersed dusts. The equipment has the time parameters of dispersing and the ignition system defined in the Standard. Experimental determination of time parameters is required for a different chamber volume. The article therefore deals with the determination of parameters for dispersing system in the 291 litre chamber. Determination of igniter delay was performed on the base of setting the time relay. Activation of pressurised air flow was determined by calculation, and it was subsequently experimentally verified in laboratory conditions. A video camera recording was selected for measuring the rate of nitrocellulose ignition from the resistance wire. The result of this study is determination of the igniter timing in dependence of the explosion chamber volume. The time delay of the nitrocellulose igniter is 320 ms.","PeriodicalId":21013,"journal":{"name":"Research Papers Faculty of Materials Science and Technology Slovak University of Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90451405","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

Potential Applications of Nanomaterials in Wastewater Treatment 纳米材料在废水处理中的潜在应用

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2021-06-01 DOI: 10.2478/rput-2021-0013

Zuzana Sanny, Alexandra Kucmanová, K. Gerulová, Lenka Gabrišová

引用次数: 11

Study Into the Changes in Soil Organic Matter, Caused By Laboratory Simulated Fires in Four Slovak Soils 1. UV-VIS Spectrum Analysis 室内模拟火灾对斯洛伐克4种土壤有机质变化的影响紫外可见光谱分析

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2021-06-01 DOI: 10.2478/rput-2021-0014

Maroš Sirotiak, Alica Pastierová, L. Blinová

引用次数: 1

Electrochemical Recovery of Silver Using a Simple Cell 用简单电池电化学回收银

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2021-06-01 DOI: 10.2478/rput-2021-0017

Igor Wachter, Tomáš Štefko

{"title":"Electrochemical Recovery of Silver Using a Simple Cell","authors":"Igor Wachter, Tomáš Štefko","doi":"10.2478/rput-2021-0017","DOIUrl":"https://doi.org/10.2478/rput-2021-0017","url":null,"abstract":"Abstract The amount of generated e-waste during the last decades has been steadily raising to the point at which it is highly desirable to obtain the precious metals by recycling the e-waste without the need of exploiting the environment. The rapid development of technology, steep growth of modern facilities with user-friendly electronical devices and a stiff competition between manufacturers are among the main reasons for decreasing the life span of such devices, and subsequently end up as an obsolete waste product. Rapid industrialization and urbanization have also caused many environmental problems, e.g. heavy metal contamination. Silver is one of the precious metals with exceptionally high industrial applications, which makes it an area of research of high interest. Demand for silver continues to grow with progress in the industrialized world, while the world reserves of high-quality silver ores are declining. Although, there are large stocks of low and lean quality silver ores still to be mined, the main goal of this article is to provide a simple, effective and eco-friendly method of silver recovery from e-waste, e.g. electrical circuit breakers using an electrochemical cell. After 20.75 days of the experiment, 1481.5 grams of silver contacts were processed with a final yield of 61.41 % grams of silver dendrite crystals (99.9 % purity).","PeriodicalId":21013,"journal":{"name":"Research Papers Faculty of Materials Science and Technology Slovak University of Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74549167","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