Research Papers Faculty of Materials Science and Technology Slovak University of Technology最新文献_第10页

Optimization of Two-Step Alkali Process of Lignin Removal from Basswood 椴木两步法碱法脱除木质素工艺的优化

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2019-06-01 DOI: 10.2478/rput-2019-0016

Igor Wachter, Tomáš Štefko, Marek Rolinec

{"title":"Optimization of Two-Step Alkali Process of Lignin Removal from Basswood","authors":"Igor Wachter, Tomáš Štefko, Marek Rolinec","doi":"10.2478/rput-2019-0016","DOIUrl":"https://doi.org/10.2478/rput-2019-0016","url":null,"abstract":"Abstract The aim of the research described in this article was to optimize the basic sulphur process of lignin removal from the raw radially cut basswood (Tilia Cordata) pieces of various thicknesses. Lignin removal took place chemically in several consecutive steps in which the influence of individual parameters was investigated (solutions of NaOH + Na2SO3, KOH + Na2SO3, its concentrations, time of leaching, efficacy of whitening agents, effect of sample washing between individual baths, etc.). Through experiments, it was found that the change of fresh NaOH + Na2SO3 solution during the experiment had no significant effect. In contrast, skipping the washing of the samples with boiling distilled water after the hydroxide bath had a significant effect on the rate and efficiency of lignin removal with H2O2 in the following step. When comparing the lignin removal efficiency of NaOH + Na2SO3 and KOH + Na2SO3, the delignification process was clearly demonstrated to be more effective using the KOH + Na2SO3 solution. Application of the above-mentioned procedures has helped to streamline the lignin removal process from solid basswood.","PeriodicalId":21013,"journal":{"name":"Research Papers Faculty of Materials Science and Technology Slovak University of Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89823248","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

Elimination of Excessive Noise at the Open Office Workplace 消除开放式办公室工作间的过度噪音

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2019-06-01 DOI: 10.2478/rput-2019-0018

P. Čekan, M. Rusko, Ján Iľko, Dieter Pietrucha

引用次数: 3

Environment and Safety Impacts of Additive Manufacturing: A Review 增材制造的环境和安全影响:综述

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2019-06-01 DOI: 10.2478/rput-2019-0001

Eva Buranská, I. Buranský, L. Morovič, Katarína Líška

引用次数: 4

Study of Explosion Characteristics of the Wheat Flour Dust Clouds in Dependence of the Particle Size Distribution 粒径分布对小麦粉粉尘云爆炸特性的影响研究

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2019-06-01 DOI: 10.2478/rput-2019-0007

R. Kuracina, Zuzana Szabová, Eva Buranská

{"title":"Study of Explosion Characteristics of the Wheat Flour Dust Clouds in Dependence of the Particle Size Distribution","authors":"R. Kuracina, Zuzana Szabová, Eva Buranská","doi":"10.2478/rput-2019-0007","DOIUrl":"https://doi.org/10.2478/rput-2019-0007","url":null,"abstract":"Abstract Fire protection is an important part of the industry where flammable and explosive dusts are found. Production, storage and transport of food powders such as flour can be very dangerous in terms of explosiveness. The article deals with the measurement of explosion characteristics of wheat flour dust. The measurements were carried out according to EN 14034-1+A1:2011 Determination of explosion characteristics of dust clouds. Part 1: Determination of the maximum explosion pressure pmax of dust clouds and the maximum rate of explosion pressure rise according to EN 14034-2+A1:2012 Determination of explosion characteristics of dust clouds - Part 2: Determination of the maximum rate of explosion pressure rise (dp/dt)max of dust clouds. A sample of wheat flour with a median particle size 84 μm exhibits the maximum explosion pressure 7.00 bar at the concentration of 600 g.m−3 and then explosion constant is 16.9 bar.s−1.m. A sample of wheat flour with a median particle size 50 μm exhibits the maximum explosion pressure 7.97 bar at the concentration of 1000 g.m−3 and the explosion constant 54.9 bar.s−1.m.Based on the results of the measurements, we found that the particle size distribution has a significant influence on the explosion parameters of the wheat flour samples.","PeriodicalId":21013,"journal":{"name":"Research Papers Faculty of Materials Science and Technology Slovak University of Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78382463","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

Heat of Combustion as the Key Fire Characteristics of Electrical Cables 燃烧热是电缆火灾的关键特性

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2019-06-01 DOI: 10.2478/rput-2019-0003

J. Martinka, P. Rantuch, Martina Hladová, Janka Sulová, A. Nečas, Denis Benko, K. Balog

{"title":"Heat of Combustion as the Key Fire Characteristics of Electrical Cables","authors":"J. Martinka, P. Rantuch, Martina Hladová, Janka Sulová, A. Nečas, Denis Benko, K. Balog","doi":"10.2478/rput-2019-0003","DOIUrl":"https://doi.org/10.2478/rput-2019-0003","url":null,"abstract":"Abstract This scientific study deals with investigation of the heat of combustion and effective heat of combustion of selected electrical cables. Two different electrical cables for rated voltage of 0.6/1 kV were investigated. Both cables were power three-core with cross-section area of each core of 1.5 mm2. The cores of both cables were made of a bar cooper wire. Insulations of conductors of both cables were made of silane cross-linked polyethylene without any inorganic filler, while the bedding and outer sheath were made of polyethylene-based copolymer (the beddings were filled with two fillers - aluminium hydroxide and calcium carbonate, while the outer sheath were filled only with aluminium hydroxide). Reaction to fire class of both cables was B2ca, s1, d0, a1. The main difference in the investigated cables was that the core of one of them was wrapped in a glass mica tape (this cable showed circuit integrity maintenance under fire conditions during 180 minutes). The heat of combustion and effective heat of combustion were determined by the oxygen bomb calorimeter according to the ISO 1716:2018 standard. The highest effective heat of combustion showed the insulation of wires (for both cables 42.47 ± 0.03 MJ/kg), lower value showed outer sheath (interval form13.61 to 15.26 MJ/kg) and the lowest value was determined for bedding (interval from 4.69 to 6.39 MJ/kg). The effective heath of combustion per unit of length of both investigated cables lies in the interval from 1.37 to 1.38 MJ/m. Therefore, there is no significant difference in effective heats of combustion of the electrical cables investigated.","PeriodicalId":21013,"journal":{"name":"Research Papers Faculty of Materials Science and Technology Slovak University of Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74288806","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

Determination of Fire Risk of Selected Alcohols 选定醇类着火危险的测定

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2019-06-01 DOI: 10.2478/rput-2019-0009

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

引用次数: 0

Timing Parameters of Pyrotechnic Igniter Based on Magnesium Powder 基于镁粉的烟火点火器定时参数研究

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2019-06-01 DOI: 10.2478/rput-2019-0011

V. Pelikan, R. Kuracina, Zuzana Szabová

引用次数: 0

Microalgae Harvesting: A Review 微藻收获研究进展

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2019-06-01 DOI: 10.2478/rput-2019-0014

Alexandra Kucmanová, K. Gerulová

{"title":"Microalgae Harvesting: A Review","authors":"Alexandra Kucmanová, K. Gerulová","doi":"10.2478/rput-2019-0014","DOIUrl":"https://doi.org/10.2478/rput-2019-0014","url":null,"abstract":"Abstract Microalgae are photosynthetic autotrophic microscopic organisms growing in a range of aquatic and terrestrial habitats. They produce a huge complex of compounds in their surroundings which are of important use to humans. Their commercial use lies in human nutrition, animal and aquatic feed, in cosmetics products, natural pigments, pharmaceutical industry, bio-fertilizer for extracting high-value molecules, stable isotope biochemicals, and for the synthesis of antimicrobial, antiviral, antibacterial and anticancer drugs. Therefore, it is necessary to develop a simple, effective and economically advantageous method for harvesting the algal products. Magnetic separation is a simple separation process. Different synthesis methods have been used by researchers to obtain magnetic particles of varying size and shapes according to the algae to be studied. Chemical co-precipitation method has been the most commonly used method, which helps in synthesizing magnetic particles of the micro to nano range. Naked, coated and surface modified are the general types of magnetic particles used for algal harvesting with its own advantages and disadvantages.","PeriodicalId":21013,"journal":{"name":"Research Papers Faculty of Materials Science and Technology Slovak University of Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77660743","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: 8

Study of Fire Characteristics of Industrial Dust 工业粉尘的燃烧特性研究

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2019-06-01 DOI: 10.2478/rput-2019-0005

Zuzana Szabová, R. Kuracina

引用次数: 1

Risks Resulting from Reverse of Modification of Expansion Weapons 扩展武器反向改装带来的风险

Research Papers Faculty of Materials Science and Technology Slovak University of Technology Pub Date : 2019-06-01 DOI: 10.2478/rput-2019-0017

P. Čekan, E. Belica, D. R. D. Sobrino

引用次数: 0