Abstract: Goal of the alternative learning strategies is to prevent a passive "sufferer" from acquiring knowledge. We have introduced this process through pupils’ activity. As a result, it becomes fun to acquire new knowledge and become internal. Our goal is to showcase programming environments and interactive tools that enforced the alternative learning strategy "learning by doing" (learning from experiences resulting) through programming, giving place for the pupils creativity in programming to do what they really love.
Key Words: teaching of programming, learning by doing, programming environments, interactive tools
Abstract: My intention in this brief presentation is to focus on what has been consistently described (by numerous Romanian critics, such as G. Calinescu, Al. Piru, I. Negoitescu and, more recently, Nicolae Manolescu) as the birth certificate of Romanian romanticism as an independent intellectual and artistic movement: the aesthetic programme of the first notable literary journal, Dacia literara (published in Iasi, in January 1840). I have also pointed out that the most remarkable cultural heir to Dacia literara was the Junimea society, which was founded in Iasi, in 1863.
Abstract: Carbon nanostructures and 2D carbon materials are considered as promising systems for applications in electronics, optics and micro-/nano-mechanics. Therefore, great attention has to be paid to analysis of such structures. In our contribution we demonstrate features in electron spectra of carbon allotropes with sp2 and sp3 hybridization. Rich information contained in various energy ranges can be utilised for mapping on nanoscale level. We present imaging of various carbon allotropes carried out in an Auger microprobe using backscattered electrons, Auger electrons, secondary electrons and reflected energy-loss electrons. We prefer the suggested techniques having obvious advantages over other methods, like X-ray photoelectron spectroscopy and electron energy loss spectroscopy in transmission electron microscope.
Key Words: Romanian literature, romanticism, journal, aesthetic manifesto, Mihail Kogalniceanu
Acknowledgment:
This work was supported by the Slovak Research and Development Agency under the contract APVV-16-0319.
Abstract: Nanocomposite AlTiSiN coatings with an initial thickness of 3 μm were deposited onto HSS 6-5-2-5 substrates. The coatings were prepared by cathodic arc evaporation using the LARC® technology. The impact of various Si content up to 7 at% on AlTiSiN structure, mechanical properties, thermal stability, oxidation resistance and presence of residual stresses inside the layers were studied while the ratio of Ti and Al remains constant (1:1). With X-ray diffraction, TEM and SEM microscopy, the morphology, structure and phase composition of coatings were evaluated. The same techniques were used after annealing of the coatings for 1 hour at different temperatures (800, 900, 1000, 1100°C). XRD analysis was also employed for detection of phase changes in deposited AlTiSiN coatings after annealing in vacuum at 1000°C. Monitoring of the thermal stability of these coatings is very important, especially since the temperature increase leads to a reduction in the internal energy and the coatings have a tend to pass through to a steady state, thereby losing their initial properties.
Abstract: The titanium biomaterials are nowadays considered as the most plausible for load-bearing long-term implants. So far monitoring of orthopedic, dental and maxillofacial implants has shown that the implants need some months to be well fixed in a bone, the implant – bone adhesion strength is not very high, the joining area of an implant and a bone does not achieve 100%, and the life-time becomes much lower than previous expected. The problems such that can be successfully solved by surface modifications in different form. The application of nanohydroxyapatite coatings implemented with nanometals preventing the local inflammations, development of two-zone dental implants preventing peri-implantitis and designing the personalized surface porous implants to enhance the bonding at the interface are presented.
Abstract: The article deals with the technology of machine construction and in particular gearing. Increase precision and extend technological possibilities by ensuring multiple continuous contact in gear and obtaining teeth with different profile and longitudinal modification of teeth. The invention relates to gear transmissions and can be used in reduction gears and power transmission mechanisms. The precession transmission comprises a body, wherein are placed two central gear-wheels, one of which is rigidly fixed in the other is connected to the driven shaft, mounted coaxially with the driving one and freely installed on the crank of the driving shaft. The precession transmission futher comprises a double-ring satellite with rollers, each of them being in mesh with a central gear.
Key Words: grinding, precession transmission, gear, technology of machine construction
Abstract: At electrspark alloying (ESA) of aluminum surfaces using Al-Sn tool-electrode (TE), nanostructuring of manufactured surfaces take place owing to the formation of SnO2 nanofibers. Examining the tribological properties of these surfaces in a friction couple with a counterbody made of hardened steel showed that the wear of counter-body during the friction in the oil and at dry friction ex-ceeds by an order of magnitude and above it the wear of such surfaces.
Key Words: Al-Sn alloy, electrospark alloying, nanostructuring, SnO2 nanofibers, wear resistance
Abstract: The AC or DC Plasma Electrolytic Oxidation (Micro Arc Oxidation) processes maybe be used to create the porous coatings on titanium in acid electrolytes with the addition of calcium, copper, magnesium, and zinc nitrates. The voltages used in case of this DC-PEO (500–650 VDC) are higher than those ones (sinusoidal symmetrical voltage signal of 200 Vpp) used in case of AC-PEO treatments. Recent Authors’ works indicate that porous AC-PEO coatings are also obtained with the use of unsymmetric rectangular voltage signals with varying frequencies from 50 Hz up to 5000 Hz. The most important issue is to choose an adequate frequency and shape of voltage signals, at which the porous PEO coatings may be formed on titanium samples. At present, it has been found out that the PEO current density is increasing with the decrease of PEO voltage frequency. However, at high frequencies used in PEO processes, a distortion of the voltage signal (small accuracy of the voltage waveform), was also observed. Therefore, the nonsymmetric shape of AC signal should be proposed with frequency in the range of 500 Hz up to 1000 Hz.
Key Words: CP Titanium Grade 2, Plasma Electrolytic Oxidation (PEO), Micro Arc Oxidation (MAO)
Acknowledgment:
This work was supported by a subsidy from Grant OPUS 11 of National Science Centre, Poland, with registration number 2016/21/B/ST8/01952, titled "Development of models of new porous coatings obtained on titanium by Plasma Electrolytic Oxidation in electrolytes containing phosphoric acid with addition of calcium, magnesium, copper and zinc nitrates".
Abstract: In the wort manufacturing process protein-tannin deposits (the so-called hot trub) are removed in a rotary vat - whirlpool. In this cylindrical container, which is empty inside, a spontaneous formation of a deposit cone occurs, this phenomenon is called tea cup effect. The mechanism of it is still not fully known. In case of the beer manufacture whirlpool’s performance depends on the correct realization of preceding stages of the wort production and of the kind, the amount and the quality of used raw materials.
The purpose of the work was the research of the possibility for using the baffle in order to intensify the phenomenon of the cone formation. A few different shapes of the baffle were created and then were installed in three different locations relative to the inlet. Particle Image Velocimetry was used to analyze the fluid flow, it is a non-intrusive whole-field method to measure fluid motion.
The development of the primitive flow and the influence of baffle on this flow were analyzed. The influence of baffle’s location on the shape and velocity of the flow were investigated. Measurements were performed for the laboratory container, and results were compared to the classical tank – empty inside.
The results show that the baffle has a positive effect in the sense of direction and location of the primitive flow, which is supporting the formation of the cone. It was possible to select the best geometrical variant of the baffle and its location relative to the inlet, for which the best flow conditions appeared.
Key Words: PIV measurements, whirlpool, hot trub, beer wort
Abstract: The tree-length method dominates in the Czech Republic (ca. 60 %), with the use of chainsaws for felling and delimbing, as well as skidders and agricultural tractors fitted with winches. National cableway system "Larix" is used in mountainous areas, which are 32K ha. About 18K m3 of timber is extracted in this way. 38 % of timber is harvested in a fully mechanized manner with the use of harvesters and forwarders connected with the Cut-to-length method. It is estimated that there are about 250 harvesters and about 1,000 forwarders. The trend of small forest owners becomes all-terrain vehicles (ATV) and iron horses. The number of sold forest machines was ca. 90 pieces over the last four years in the Czech Republic. The cost of felling and timber extracting is 7.1 and 8.8 €/m3, respectively. Municipal forests and private owners take an individual approach to timber transport operations. They either do it by themselves or through outsourced services – depending on the economic efficiency.
Key Words: timber transport, forwarder, skidder, ATV, cableway system
Abstract: The titanium biomaterials are nowadays considered as the most plausible for long-term load-bearing implants. The careful monitoring has shown even the titanium implants behave not satisfactory. The titanium orthopedic, dental and maxillofacial implants need some months to be well fixed in a bone. The implant-bone adhesion strength is not satisfactory. The joining area of an implant and a bone far from 100%. The bone tissue disappears in the vicinity of an implant; The lifetime often becomes much lower than previously expected. The problems such that can be successfully solved by surface modifications in different form. The nanohydroxyapatite and composite coatings implemented with nanometals curing the local inflammations, the two-zone dental hybrid implants preventing peri-implantitis, and the surface resistant to surgery due damage and enhancing the bioactivity at the interface are proposed.
Abstract: The contribution deals with the possibilities of using integral transforms in monitoring the aluminium cast defects in the manufacturing process. The paper aims at the proposing of a method determined for automated defects detection occurring in the process of cast manufacturing and its completion.
Key Words: integral transforms, phase correlation, production, detection
Abstract: Nowadays, a lot of emphasis is placed on the reliability of the machines, because at any shutdown of the machine, the company has financial losses that need to be minimized. Based on this, a very important prediction is in the field of machine diagnostics and early intervention in the case of an error. Therefore, it is important to choose measurement and evaluation methods that are simpler and especially faster to evaluate. Based on this, we will focus on measuring and evaluating the temperature, vibration and noise on the spindle of an experimental cross-cutting device and monitor their interactions.
Key Words: vibration, noise, temperature, reliability, diagnostics
Abstract: The article deals with research of the coating of wood cutting tools, namely cutting knives. The coated and uncoated cutting knife was evaluated by the profile projector after operating experiment. The TiCrN coating state was metallographically evaluated after wear. We examined the effect of coating on tool life. On the coated sample - cut from the cutting knife, we evaluated the quality of the substrate - coating complex.
Key Words: cutting knife, coating, wear of the cutting edge, lifetime of the tools
Abstract: The poster presents an assessment of the possibility to improve the quality of the work area, increase tool life, and reduce the energy intensity of wood processing using circular saws using coating. Two types of saw blades with WC tips and without WC tips were selected for analysis. On the basis of input material analyses, a suitable technology for the coating of circular saws was chosen which would not affect the mechanical properties of the tool materials. The samples were coated with three kinds of PVD coatings, AlTiN, AlTiCrSiN and AlTiCrN. Coated surfaces were evaluated on the light microscope Keyence VHX-2000. The energy intensity of the sawing process was measured using a torque sensor and the measured values were converted to electrical power as the benchmark of the energy intensity of the sawing process. On the basis of the results obtained, recommendations were made for practice.
Key Words: circular saws, tool life, coating, energy intensity
Abstract: The tree-length method dominates in the Czech Republic (ca. 60%), with the use of chainsaws for felling and delimbing, as well as skidders and agricultural tractors fitted with winches. National cableway system "Larix" is used in mountainous areas, which are 32K ha. About 18K m3 of timber is extracted in this way. 38% of timber is harvested in a fully mechanized manner with the use of harvesters and forwarders connected with the Cut-to-length method. It is estimated that there are about 250 harvesters and about 1,000 forwarders. The trend of small forest owners becomes all-terrain vehicles (ATV) and iron horses. The number of sold forest machines was ca. 90 pieces over the last four years in the Czech Republic. The cost of felling and timber extracting is 7.1 and 8.8 €/m3, respectively. Municipal forests and private owners take an individual approach to timber transport operations. They either do it by themselves or through outsourced services – depending on the economic efficiency.
Key Words: timber transport, forwarder, skidder, ATV, cableway system
Abstract: The work presents the results of analyses on the presence of physical impurities in chemical cleaning solutions regenerated in CIP reservoirs through sedimentation. The chemicals under analysis were acid solutions and sodium solutions used in cleaning brewing equipment. Once a week, for 25 weeks, a sample of each solution was taken. First, before the cleaning process (clean solution, free from solid particles), and then after the cleaning was finished (solution contaminated with sediment from the brewing equipment). The volume and concentration of solid sediment in each solution was evaluated, along with the size of the present solid particles and their percentage contribution. The size analysis was conducted with the Shadow Sizing method and the DynamicStudio software. The measurements were performed with the FlowSense 2M camera, with a 1600x1200 pixels resolution sensor and a manual macro lens Nikkor 50 f/1.8. Research on turbidity and residue concentration was conducted in diffused light with the wavelength equal to 860 nm (infrared light) at the angles of 90° and 135°. The volume of the residue in solutions was evaluated in accordance with the Polish Standard PN-EN 12255-4:2005 - Wastewater Treatment Plants - Part 4: Primary Settlement. The research results showed that purification of cleaning solutions through sedimentation of residue does not provide complete physical purity. The solutions still contained residue particles from the washed production system. Those particles do not settle through sedimentation and are present in the form of a thin suspension, which can impede the purification process of the installation.
Key Words: cleaning solutions, CIP system, regeneration, sedimentation
Abstract: Clean-In-Place (CIP) is a widespread process to clean surface of equipment in food industry. The aim of this study was to analysis the cleaning rate and degree of different food processing fouling removal for cleaning medium in CIP system aided with barbotage. To acquire quantitative results a computer image analysis was utilized. The process was carried out under constant parameters of cleaning medium. The flow velocity of rinsing water w = 2.2 [ms-1], temperature of water T = 20 [°C] and flow rate of air to generate barbotage - vB = 1.95 [dm3s-1]. The tests were repeated three times for each deposit. The analysis have shown that the mechanical interactions during the cleaning process obtained by the cleaning agent flow along with the barbotage effect give a better final effect of cleaning than without air injection. However more research should be done to obtain clean tested surface after processing food materials.
Key Words: clean in CIP, mechanical interactions, air barbotage, food processing fouling
Abstract: The advent of agriculture began in the Neolithic Period of the Stone Age about 11,500 years ago. During the Neolithic Revolution, bands of hunters and gatherers began forming organized communities to cultivate the land — the beginning of civilization. The brewing of alcohol seems to have been a very early development linked with initial domestication, seen during Neolithic times in China, Sudan, the first pottery in Greece and possibly with the first use of maize. The article covers most important milestones in the history of beer. Some of the oldest still working breweries are presented, alongside with representatives of the oldest beers. In spite of the appearance of new trends traditional recipes are still popular and on the rise on the market. Beer has always been a part of human history and seems like it will not disappear any time soon.
Key Words: beer history, oldest breweries, Sahti, Preservation beer
Abstract: The article discusses the use of beer adjuncts in a process of beer making. Adjuncts are unmalted grains such as corn, rice, rye, oats, barley, and wheat. They are used with the intention of cutting the costs and to create an additional feature, such as better foam retention, flavors or nutritional value or additives. Authors present detailed reasons of adjunct application as well as some of more important drawbacks. The use of adjuncts has been a popular topic of discussion over the years, as they influence not only the taste of the final product but also require changes in the technology of brewing. The adjuncts became an important aspect of modern brewing and are an essential ingredient in many styles. Like any ingredient in the beer recipe they should be selected and used based on their contribution to the final product not just costs.
Key Words: beer adjuncts, grains, Purity Law
Abstract: At present, we can repeatedly recycle and reuse plastics and recover their components through biodegradation or energy of chemical bonds during combustion. Recycling of waste plastics still remains a challenging area in the waste management sector. Quality of plastics recycling is of a major concern. The main aspects influencing it were identified to be the following four: polymer cross contamination, additives, non-polymer impurities and degradation. Conventional plastics are mostly produced from non-renewable sources. Addressing the negative impact of plastics on the environment is not simple. Plastic is ubiquitous and comprises everything from disposable medical syringes to food packaging and various everyday items. The core issue is that very few polymers are recycled on a large scale. High-density polyethylene (HDPE) and polyethylene terephthalate (PET), followed by polypropylene (PP) and polystyrene (PS), are the most commonly recycled. This reprocessing of the sorted polymers can be done in various ways. The fractions containing multilayer packaging are partially incinerated and partially recycled mechanically. In the cases of the mechanical recycling of fractions in which multilayers are contained, the presorted material has to undergo a second sorting step. Here, material that is not polyolefin-based has to be removed. Therefore, the material is first shredded and washed, and afterwards it is treated by sink-float separation. After thorough separation selected mulitlayer plastics waste components can be recycled mechanically. A solution for mixed, contaminated or degraded plastic waste is incineration. Incineration has the potential to recover the chemical energy bound in the polymer, corresponding to the caloric value. Since most polymers have a caloric value in the same range as that of crude oil (ca. 40 MJ/kg) plastic waste can be regarded as a crude oil substituent. However, it should be noted that the processing energy that is required to produce plastic items cannot be recovered by incineration. Mechanical recycling has the potential to save this processing energy as well as the chemical energy. Depending on the type of polymer, the processing energy of polymers ranges from 27 MJ/kg (PE) to 53 MJ/kg (PET).
Key Words: recycling, polymer, waste management, biodegradation
Abstract: Recently the intelligent space (iSPace) applications have become increasingly beneficial considering robot control. In the presentation we introduce the intelligent space environment developed at the Intelligent Robotic Center of J. Selye University. This environment is using an OptiTrack camera system consisting of 24 cameras, which can track the movements of various robot agents in real time using markers.
Key Words: intelligent space, motion capture system, robotics
Abstract: The submitted article deals with issue of application PVD coating nACRo4 deposited on the High Contact Ratio gearing made of 16MnCr5 material in interaction with the conventional PP 90H lubricant and biological Biogear S150 lubricant. Experimental tests were carried out on FZG test rig with closed performance flow, followed by measuring of the surface roughness change. In experiment we followed STN 65 6280 norm for FZG scuffing tests, from which we gained the load values for different load levels. The results of experimental tests were statistically processed and on basis on them were established relations between surface roughness and load level for both used lubricants.
Key Words: FZG test, HCR gearing, ecological oil, PVD coating
Acknowledgment:
Contribution has been prepared within the solving of scientific grant project VEGA 1/0227/15 "Study of tribological characteristics of the new high hard coatings on materials suitable for gearings."
Abstract: The modern teacher of engineering must be updated continuously with the modern technologies, achievements and innovations. Nowadays information technology helps teachers to have unlimited access to contemporary scientific knowledge. Effective teaching techniques and methodologies are now a requirement for every teacher, and can be learn and perfected like any other skill.
The student is empowered and encouraged by the education staff to express their priorities regarding their desired educational outcomes. Students are given opportunities to interact with and to take responsibility for their own learning.
Computer and information technology enable teachers to introduce and use modern teaching methodologies to transfer knowledge to students, who choose learning methodologies to get 'the best' skills and expertise.
Transition from teacher-centered to student-centered learning (SCT) approaches doesn't mean that teachers do not teach, but put them as facilitators of the learning process, leading to sustainable teaching. It is a broad number of approaches for SCT as Problem-Based Learning, Case-Based Learning, Project-Based Learning, Blended Learning, etc...
In technical and engineering education team work is common for solving the problems, cases or tasks where team members identify problem, develop methods and techniques to solve the problem. Team work approach enables students to get or improve skills in communication, collaboration and decision making, while teacher’s role is to advice and facilitate the process and the assessment of the work.
Key Words: information technology, student-centered learning, team work, teacher
Abstract: Surface texture is an indelible part of the system of standards for geometric product specification and inspection. However, due to complexity of the problems and insufficient capacities, the existing methods for surface texture specification and inspection are often employed only superficially. This work aims to identify practical problems with surface texture inspection and propose ways to improve its practical usefulness without disrupting manufacturing operations.
Key Words: surface texture inspection, geometrical product specification, manufacturing quality control, surface metrology
Abstract: Biochar is a highly homogeneous fuel produced by hydrothermal carbonization from a highly heterogeneous biomass. It is a neutral CO2 source with a very low content of heavy metals, sulfur and toxic substances as well as NOx emissions. It has a high calorific value, it is not degradable and does not boil in boilers as it has a high ash melting temperature (1400°C). This work deals with the possibilities of compaction of the powder biochar, which in the original state is not used efficiently. Various combinations of phytomass with biochar are processed in the work and their mechanical properties are tested. The importance of this work consists in compaction of the biochar with suitable additional material in order to produce pellets with the required mechanical properties. The results of the work are made of pellets with different ratios of straw and biohazard as well as with measured mechanical properties.
Key Words: biochar, biomass, compacting
Abstract: The aim of the presented work was to determine the effect of platinum on high-temperature oxidation of selected alloys from the Ni-Al system, with particular emphasis on the formation mechanism of the protective Al2O3 oxide layer. The mechanism of scale formation on tested materials oxidized at 1150°C was determined by means of the two-stage oxidation method using the 18O2 isotope. In conjunction with the profiling of oxygen isotope distribution across the oxide scale, performed using the secondary ion mass spectrometry technique (SIMS), it was possible to trace changes in the oxide formation process as a function of reaction time and correlate them to the evolution of the phase composition recorded by means of photoluminescence spectroscopy (PLS).
Key Words: Ni-Al alloys, oxidation mechanism, oxygen isotopes, two-stage oxidation, SIMS, PLS
Abstract: Unique properties and acceptable production cost of low-dimensional nanomaterials contribute together to their possible applications. Size of these nanomaterials together with their surface functionalization define them as promising material in biomedicine applications, surface coatings, cancer cell sensing, targeted drug delivery and many more. Among biocompatible graphene derivatives, such as graphene oxide (GO) and reduced GO (rGO) various biocompatible two-dimensional (2D) materials such as nanosheets of transition metal dichalcogenide have been revealed and investigated.
The MoS2 flakes were characterized locally by the high-resolution transmission electron microscopy HRTEM. The high lateral resolution at Ångstrom level allows a detailed mapping of atomic structure of the exfoliated MoS2 nanoflakes. The scanning mode (STEM) will be mostly employed because the imaging contrast relies on Z-factor of the element which will enable us to visualize different elements with different contrast.
Key Words: transmission electron microscopy, low dimensional materials
Abstract: Surface finishng process in centrifugal rotary machines is a very effective way of smoothing the surface of objects with complex shapes, made of various types of materials. However, this process is often long-lasting. The presented results of experimental tests and analyzes have shown that the energy of the stream of abrasive chips is variable in the axial cross-section. The values and distributions of this energy can be determined by measuring the acoustic emission signal. Knowledge of the location and size of the most energy-intensive areas of operation may be the basis for their identification in order to carry out the processing ensuring the highest productivity and technological quality of the machined surface.
Key Words: surface finishing, rotary machines, stream energy, process efficiency, acoustic emission
Abstract: In a transforming and globalized world, high-quality education has become vital for better equipping students to actively take part in this dynamic society. It is why researchers and educators are focusing more and more on student-centred learning as a promising approach to reach their goal. Students tend to augment their performance if, instead of only being ‘taught’, they are helped and encouraged to learn and develop their abilities. In a student-centred classroom, the teacher and students become nothing less than a team working together. From the perspective of higher education, good collaboration with schools is equally paramount as the relationship between school experience and higher education experience defines how students understand their role as future teachers.
Abstract: One of the important conditions to ensure the required surface quality, when cutting materials with a high-pressure abrasive water jet, is the curvature of the cut shape. An important goal of the presented investigation was to determine jet impact on the surface quality on the upper and lower regions of material intersection. The differentiation of the cutting zone refers respectively to the formation of inner and outer cylindrical surfaces. This aim was realized by cutting out spiral shape and the influence of the radius of the cutting-head trajectory on selected parameters of the geometrical structure (SGP) was investigated. The determined values of the SGP parameters and the shape of the intersection surface clearly indicate that forming the cylindrical surfaces with an abrasive water jet, which corresponds to the inner surface of the cut-out spirals, provides better technological quality than external surfaces (corresponding to the inner surface of the cut-out spirals). Since the process of forming cylindrical shapes is fraught with a deterioration in the quality of surface, technological considerations recommend that external surfaces prevail in the waste part of the workpiece.
Key Words: surface quality, abrasive water jet, cutting, glass
Abstract: The state-of–the–art double corrected, analytical transmission electron microscope JEM ARM200cF with atomic resolution, which is installed at the Centre STU for Nanodiagnostic at the Slovak University of Technology in Bratislava allows comprehensive characterization of nanostructured objects on atomic level. Using this microscope two objects spaced 0.078 nm can be visualized. Apart from TEM and STEM imaging with atomic resolution, JEM ARM200cF provides a wealth of complementary spectroscopic and crystallographic information about the sample. These information can be acquired using different techniques of electron diffraction, electron energy loss spectroscopy (EELS), and energy dispersive spectroscopy (EDS) methods. The application of JEM ARM200cF will be illustrated by practical examples. Selected nanostructures will be characterized in terms of crystal structure, crystallinity, defectiveness, crystal size, morphology, and chemical composition.
Acknowledgment:
This article was created with the support of the Ministry of Education, Science, Research and Sport of the Slovak Republic within the Research and Development Operational Programme for the project "University Science Park of STU Bratislava", ITMS 26240220084, co-funded by the European Regional Development Fund.
Abstract: Ever since people developed iron tools they realised that rust sets in easily. Not surprisingly then, corrosion being a property metals has been honed into a science. This presentation, however, is devoted to the science and poetics of language that gives testimony to the strong connection between rust and human body and soul, as well as moral values.
Abstract: The wide range of application of wood is due to its strength properties, which allow for versatile application. It is an excellent, healthy and renewable material with a complex structure consisting of many types of cells and substances present in different amounts, depending on the species of wood and its parts. Therefore the mechanical properties of wood in various parts can be different.
In this paper a brief review of the effects of surface modifications of woodworking tools tools in the context of their durability are presented. In the relatively short period of use modified with a hard coating of tools, many publications were presented. The nature of woodworking is difficult despite the fact that wood is one of the oldest materials utilized by man. There is also a short description of the design work related to the improvement of the utility properties of the tools taking into account the heterogeneity of mechanical properties of the treated material - wood.
Key Words: tool' modification, woodworking tool, lifetime of the tools
Abstract: The society we live in is constantly changing and updating and so should be the students who are trying to keep up with the demands of a permanently developing world, especially if they want to work in an environment that offers them the possibly of specialising in a certain field. Their knowledge of English, especially in the technical field is, not only extremely beneficial, but it also a boost of confidence regarding their skills and future success. It is important to focus on the students in order to offer them support in class as they should see their teacher as the one guiding them through the process of acquiring technical knowledge in another language, but also the one that can give them insights of what would mean for themselves to be teaching such topics.
Key Words: knowledge, technical language, skills
Abstract: The subject of the study were acids, salts and bases with known concentrations. During the tests, the dependence of the conductivity of aqueous solutions of the abovementioned compounds on their percentage concentration was checked. The aim of the study was to show the possibility of replacing standard laboratory methods (eg. titration) for determining the percentage of chemical compounds by the conductometric method. The results of the research were presented using graphs.
Abstract: The most popular form of Atlantic herring used in the production of fish products are lobes and fillets. Fixation takes place through a pre-treatment appropriate for a given type of raw material and by using a dedicated method of packaging. The most popular pre-treatments are marinating in vinegar/salt brines, frying and smoking. The most common packaging methods are closure in jars with the addition of a brine, packing in a modified atmosphere and packaging in a vacuum. The subject of the research were marinated fillets, smoked fillets, marinated lobes and fried lobes. The tests were compared in terms of physico-chemical, organoleptic and packaging methods.
Abstract: Anionic surfactants are used as ingredients for professional foam cleaners. Foam cleaning is one of the most popular methods for hygienization of large surfaces. The ingredients of cleaning agents and the parameters of the cleaning process are responsible for the quality of the foam produced. As part of the work was evaluated, the effect of temperature, concentration and water hardness on the foaminess of the anionic surfactant from the group of alkyl ether sulphates called INCI Sodium Laureth Sulfate. The research was carried out with the Ross Miles method consisting in the production of foam in a calibrated, thermostated cylinder by free flow of the tested solution to the surface of the liquid. As a result of the tests, it was found that the agent is insensitive to the effects of calcium and magnesium ions affecting the hardness of water in the range of 7.5o to 30o and the amount of foam generated does not depend on the temperature of the solution (30-60oC). However, as the concentration of the active substance increases (0.125-1.5%), the height of the foam column rises from 230 to 265 mm.
Abstract: Foam cleaning is currently used in many industries. In the food industry, it plays a major role in the meat and fish industry for cleaning large surfaces and external elements of machines and equipmentes. The ingredients of cleaning agents and the parameters of the cleaning process are responsible for the quality of the foam. As part of the study was evaluated, the effect of temperature, concentration and water hardness on the foaminess and surface tension of anionic surfactants used as components of professional cleaning agents. Five chemical agents were analyzed at temperatures: 10, 20, 30, 40, 50oC, concentrations of active substance in the concentrate: 0, 4, 8,12,16%, for water hardness degrees: 0, 8,16,24, 32o and pH : 1, 4, 7, 12.16. As a result of the research was developed, a function describing the dependence of foaminess and surface tension on the tested parameters.
Key Words: anionic surfactants, surface tension, foaminess
Abstract: Learning and understanding computer science algorithms are one of the difficult tasks for first-year undergraduate computer science students. Algorithms use abstract concepts, which could be challenging to comprehend. Interactive animations, especially animations with conceptual view, can make a bridge between these abstract concepts and real world examples. To help novice computer science students, we collected and developed some web-base animations of computer science algorithms, and made these animations freely available at http://algoanim.ide.sk website. Some of our interactive animations we used to conduct pedagogical experiments during the academic year 2014/15 and 2015/16. The results showed that these animations helped students, they were able to understand the computer science algorithms quicker and easier.
Key Words: teaching and learning programming; algorithm animations; interactive animations
Abstract: Teaching ESP to adults has its own set of challenges but when it comes to the use of Specialized English the learning process is twice as difficult. However, mastering English as a lingua franca (ELF) in different fields represents the ABC of successful communication since English is increasingly used as a medium of instruction. The present paper deals with the issues deriving from the process of developing the students’ pragmatic and discursive competencies.
Abstract: Cutting pipes of different intersections to the crossing each other, three-dimensional skeletons of structure is a difficult process in which it is necessary to use a computer program to draw the trajectory of motion of the torch. The process is getting more difficult when the chamfering is performed which is necessary for subsequent welding operations. In the process of oxygen cutting of steel pipes robotized stand with Fanuc Robot Arc MATE 120iC and Tube Cut Universal software were used and the cutting roughness was examined according to the requirements included in PN-EN ISO standards.
Abstract: Nowadays, 3D printing has become an inherent element of rapid prototyping and manufacturing of real object models to study structures and modify them. Different types of composite materials are created that combine 3d printing with metal. This article presents ways to add metal inserts, e.g. nuts, screws etc. in 3D printouts. The preparation of models for various inserts has been described. It shows how to modify g-code to install an element during printing.
Abstract: The paper presents possibilities of using drones-multicopters as air platforms with machines mounted on them for spreading mineral fertilizers in form of granulate and dust as well as for fertilizing and feeding plants with liquid fertilizers. The possibilities of using unmanned aerial vehicles equipped with sowing and planting machines as autonomously controlled robots for work in forestry and agriculture were also presented.
Abstract: Modern management in sustainable agriculture requires the fast information about condition of cultivated plants and the quick response to undesirable phenomena such as appearance of pests. The use of unmanned aerial vehicles for spraying plants will allow for rapid application of plant protection agents on the growing areas.
Abstract: The AISI 316Ti (EN 1.4571) austenitic stainless steel sample (50 × 30 × 1,5 mm) was used for the study. The main elements forming the steel are: chromium (16-18%), molybdenum (2.0-3.0%), nickel (10.0-14.0%), titanium (max 0.7%), and iron as the rest of the steel composition. The electrolytic polishing operations were performed at the current density of 50 A/dm2. The main elements of the electropolishing setup were a processing cell, a DC power supply RNG-3010, the electrodes and connecting wiring. The studies were carried out in the electrolyte of initial temperature of 50±5 °C. For the studies, as the electrolyte a mixture of two acids, i.e. H3PO4:H2SO4 equal to 60%:40%, was used. For surface characterization the 3D roughness parameters(Sa=0.744 μm, Sq=0.984; Sp=2.32, Sv=3.5, St=5.88; Ssk=–0.898; Sku=2.97) regarding ISO25178 were used.
Abstract: The article discusses transport applications of most popular stainless steels. The basic information about the production of alloy steels, hot rolling, mechanical and corrosion properties in that paper, are presented. In addition, the plots of yield strength, relative elongation, hardness and corrosion resistance (PREN) for selected stainless steels were shown.
Abstract: The work discusses the process of burnishing rolling of the surface of Duplex steel rollers. Burning surfaces were prepared in the rolling process. They were characterized by asperities of the surface with angle θ=90°. Then the surface was burnished to a depth equal to ½ of the asperities height. Surface measurements were made and roughness parameters were determined after pre-treatment (turning) and after burnishing. The results of measurements in the form of profilometers, material bearing and microstructure photos are presented.
Abstract: Soil organic matter (OM) is under big attention now to avoid degradation of soil. Fast, affordable and accurate systems for high resolution spatial measurement on-the-site are necessary for proper monitoring and recovery of the soil.
Abstract: Remote sensing of plant health and vigor acquired with multispectral or hyperspectral imagery, both from satellites and small Unmanned Aircraft Vehicle with appropriate processing provide valuable, rapid, precise and high resolution information about plants' health. Although, a lot of factors influent the readings and must be considered and minimalized to avoid wrong measurements.
Abstract: Small Unmanned Aerial Vehicles (UAV) with MTO <25 kg revolutionized acquiring valuable data from low altitude (up to 300 meters AGL) in agriculture. Both multirotor and fixed wing planes are being used with their advantages and disadvantages.
Abstract: The article presents a project aimed at improving the service process in the spare parts warehouse, taking into account particular aspects of warehouse management. An analysis was carried out using various methods of process optimization. An alternative solution was proposed to minimize the order picking time. The new organization was simulated in the warehouse.
Abstract: In the article technologies were presented cleaning pipelines at using high-pressure of water stream. Ways of scavenging in pipelines and types of heads used for dismissing them were described. Virtues were characterized hydrojetting of cleaning pipelines.
Abstract: The article presents technologies for cutting materials using a high-pressure water jet. The possibilities of cutting wood and wood-based materials are presented. The advantages and disadvantages of using high-pressure water and abrasive water jet in the process of material cutting were presented.
Abstract: The paper presents possibilities of using drones-multicopters as air platforms with machines mounted on them for spreading mineral fertilizers in form of granulate and dust as well as for fertilizing and feeding plants with liquid fertilizers. The possibilities of using unmanned aerial vehicles equipped with sowing and planting machines as autonomously controlled robots for work in forestry and agriculture were also presented.
Abstract: Modern management in sustainable agriculture requires the fast information about condition of cultivated plants and the quick response to undesirable phenomena such as appearance of pests. The use of unmanned aerial vehicles for spraying plants will allow for rapid application of plant protection agents on the growing areas.
Abstract: The poster presents the possibilities of using chicken manure as an energy fuel. The aim of this study is to assess its potential in the field of energy production. The production of energy from chicken manure can be achieved by anaerobic digestion, direct combustion, and fluidized bed increments. Currently, most of these technologies are practiced on an experimental scale, only some of them on a commercial scale.
Abstract: The poster presents binders for the production of biomass pellets are materials added during the pelleting process or natural ones contained in the plant biomass. Binders during agglomeration undergo specific physical and chemical changes that have a significant impact on the energy consumption of the pelleting process and the quality of the granulate.