Application of a Procedural FMEA for the Production of Bearings

Import 23/08/2017Diplomová práce se zabývá aplikací procesní FMEA pro výrobu ložisek a byla zpracována ve společnosti Koyo Bearings Česká republika s.r.o. Cílem práce je zmapovat výrobní procesy, analyzovat možnosti vzniku vad a jejich následky. Následně navrhnout vhodnou strukturu FMEA a nastavit pravidla k jejímu používání. Celá diplomová práce je přehledně rozdělena na dvě základní části, teoretickou a praktickou. Teoretická část obsahuje rozbor řešené problematiky a její využití v praxi. V praktické části jsou nejprve uvedeny informace o společnosti Koyo Bearings Česká republika s.r.o. a je provedena analýza současného stavu procesu výroby ložisek. Analýza je vyhodnocena a následně provedena aplikace metody FMEA. Závěr diplomové práce je věnován návrhu vhodné struktury FMEA procesů a nastavení pravidel k jejímu použití v podniku.The thesis deals with the application of a procedural FMEA for the production of bearings and was processed in Koyo Bearings Česká republika s.r.o. The objective is to introduce production processes and to analyze possibilities of defects and their consequences. The task is solved by suggesting the appropriate FMEA structure and setting rules for its use. The thesis is clearly divided into two basic parts, theoretical and practical. The theoretical part contains an analysis of the problem solved and its use in practice. In the practical part, there is the information about Koyo Bearings Česká republika s.r.o., and the analysis of the current state of the bearing production process is carried out. The analysis is evaluated and the FMEA method is applied. The conclusion of the thesis is devoted to the proposal of an appropriate structure of FMEA processes and setting the rules for its use in the company.345 - Katedra mechanické technologievýborn

The impact of including rest time between transport and slaughter on the IGF-1 and cortisol concentration in the blood serum of barrows

The aim of our experiment was to observe the differences of IGF-I and cortisol concentrations in the blood serum of pigs when killed immediately after transport and after a 48 hour stay in a slaughterhouse.  We tested 24 Large white barrows from one breed with the average weight of 105 kg. The first group went through a 2 hour long transport before slaughter. After being delivered to the slaughterhouse, the barrows were killed immediately. After transport, the second group was stabled for 48 hours in a stabling space near the slaughterhouse and the barrows were killed after that. There were 12 animals in each experimental group. Blood samples were taken immediately after slaughter. We used the ELISA method to determine IGF-I and cortisol concentration in the serum. The IGF-I concentration in the serum was significantly lower (p < 0.01) in the barrow group that was killed after the 48 hour stay in the stabling space near the slaughterhouse, as opposed to the barrow group that was killed immediately after transport. The cortisol concentration in the serum of both experimental groups did not display significant differences. Our results indicate that stabling animals in a waiting stabling space near the slaughterhouse can cause a long-lasting stress instead of relax

Analýza středověkých valonských toponym v Rumunsku a Srbsku

Predložená práca skúma toponýmia valónskeho pôvodu v priestore dnešného Rumunska a Srbska, najmä však v regiónoch bývalého Uhorska. Valóni emigrovali do Uhorska najmä z ekonomických dôvodov, dôležitú úlohu tu však zohrávala ľudová zbožnosť v 11. storočí a nárast významu pútnickych miest (Jeruzalem či Santiago de Compostela). Počet púti sa zvýšil od roku 1018, kedy došlo k otvorenie pútnickej trasy smerujúcej cez Uhorsko do Jeruzalema. V tom čase sa v Uhorsku usadilo takisto i veľké množstvo Valónov. Dnešné Valónsko patrilo v stredoveku do Svätej rímskej ríše. V 11. storočí však v tejto oblasti, ako aj inde v západnej Európe, došlo k hladomorom, neúrodam a bol tu nedostatok pôdy. Valóni našli svoj nový domov v Uhorsku, tu sa venovali vinohradníctvu a obchodu. Často krát dali svojim novým lokalitám názvy podľa domovských valónských lokalít. V Rumunsku sa valónske lokality nachádzali v okolí Veľkého Varadína (Oradea) a Sibiu. Valóni tu stáli i za vznikom špecifického fenoménu - opevnených kostolov. Mnoho Valónov získalo i šľachtický titul. V priestore Srbska nachádzame valónske osídlenie v Srieme, ide predovšetkým o mestá Eng a Francavilla. Na základe desiatkov zaplatených pápežskej kúrii z rokov 1332-1337 môžeme rekonštruovať demografické údaje.This paper examines toponyms of Walloon origin in the area of today's Romania and Serbia, especially in the regions of the former Kingdom of Hungary. Walloons emigrated to Hungary mainly because of economic reasons, but here the important role played the popular devotion in the 11th century and the importance of pilgrim sites (Jerusalem or Santiago de Compostela). Number of pilgrimage has increased since 1018, when the route leading through Hungary to Jerusalem was openend. Large number of Walloons setteld in Hungary at this time. Present-day Wallonia in the Middle Ages belonged to the Holy Roman Empire. In the 11th century, as elsewhere in Western Europe, there was a famine and lack of land. Walloons have found their new home in Hungary, they were engaged in viticulture and trade. They also often named the new locations by the home sites of Wallonia. In Romania, the Walloon sites were situated near Oradea and Sibiu. Walloons have created a specific phenomenon - the fortified churches. Many Walloons also received a noble title. In the area of Serbia we are located Walloon settlements in Srem, especially speaking about the cities of Francavilla and Eng. Based on the tithes paid for the Papal Curia from 1332-1337 we can reconstruct demographic data.Department of South Slavonic and Balkan StudiesKatedra jihoslovanských a balkanistických studiíFilozofická fakultaFaculty of Art

Adsorption and emulsifying properties of pumpkin (Cucurbita pepo) seed protein isolate and hydrolysate

Seme tikve (Cucurbita pepo) obiluje kako uljem tako i proteinima. Nakon izdvajanja ulja, proteini se koncentrišu u uljanoj pogači, sekundarnom proizvodu procesa proizvodnje ulja, gde njihov sadrţaj dostiţe do 65%. Proteini semena tikve su primamljiv sastojak za prehrambenu, farmaceutsku i kozmetičku industriju zbog svoje farmakološke aktivnosti i visoke biološke vrednosti. Pored toga, budući da su mnogi proizvodi ovih industrija po svojoj koloidnoj prirodi emulzije, proteini semena tikve bi se u njima mogli naći i kao prirodne površinski aktivne materije. Međutim, koloidna funkcionalnost proteina semena tikve se još uvek potcenjuje zbog globularne strukture za koju se vezuju slabija funkcionalna svojstva u odnosu na proteine sa fleksibilnijom strukturom. Prema tome, cilj ove disertacije je ispitivanje funkcionalnih osobina proteinskog izolata semena tikve, pre svega njegovih adsorpcionih i emulgujućih svojstava, kao i ispitivanje uticaja promene proteinske strukture putem enzimske hidrolize na ispitivana svojstva. Pripremljeni su izolat proteina semena tikve (IPST) i dva enzimska hidrolizata, H1 i H2. IPST, H1 i H2 su okarakterisani određivanjem sadržaja vlage, proteina i pepela, zatim, određivanjem prinosa, molekulske mase i zeta potencijala. Ispitan je uticaj koncentracije proteina/peptida (0,0001–1 g/100 cm3), pH (3–8) i jonske jačine (0–1 mol/dm3 NaCl) na rastvorljivost i adsorpciona svojstva: dinamički međupovršinski pritisak (ulje/voda), statički površinski (vazduh/voda) i međupovršinski (ulje/voda) pritisak, kinetiku adsorpcije i dilatacionu reologiju proteinskih adsorpcionih filmova. Nakon toga, ispitan je i uticaj pomenutih parametara na emulziona svojstva IPST, H1 i H2. Emulgujuća svojstva IPST, H1 i H2 su okarakterisana na osnovu prosečnog prečnika kapljica emulzija, raspodele veličina kapljica i stabilnosti emulzija. Utvrđeno je da je prinos IPST veći od prinosa oba hidrolizata za oko 65 %. IPST ima najniţu rastvorljivost na pH=5, što ujedno predstavlja i njegovu izoelektričnu tačku. Enzimskom hidrolizom IPST značajno se povećava rastvorljivost, posebno na pI=5. Povećanje jonske jačine je izazvalo salting–in ili salting–out efekat rastvorljivosti kod svih uzoraka u zavisnosti od pH. IPST, H1 i H2 poseduju površinsku aktivnost pri čemu je površinski/međupovršinski pritisak H1 i H2 manje zavistan od promene pH i jonske jačine u poređenju sa površinskim/međupovršinskim pritiskom IPST. Adsorpcijom na granicu faza IPST i oba hidrolizata obrazuju adsorpcione filmove sa dominantnom elastičnom komponentom. Emulgujuća svojstva IPST, H1 i H2 zavise od koncentracije uzorka, pH vrednosti i jonske jačine kontinualne faze. Pri koncentraciji od 1 g/100 cm3 i Ic=0 mol/dm3 pripremljene emulzije su stabilne na svim pH osim emulzije IPST na pH 5. Sve emulzije podležu gravitacionoj nestabilnosti.Pumpkin (Cucurbita pepo) seed is rich source of both, oil and proteins. Once the oil has been extracted, proteins concentrate in oil cake, a by–product of the oil extraction process, where their content can reach up to 65%. Pumpkin seed proteins are desirable ingredient in food, pharmaceutical and cosmetic industry due to their pharmacological activities and high biological value. Moreover, since many of products of these industries are, in colloidal terms, emulsions, pumpkin seed proteins could serve as surface active materies. However, colloidal functionality of pumpkin seed proteins is still underestimated for their globular structure which entails inferior functional properties to functional properties of proteins with more flexible structure. Based on that, the aim of this dissertation is to investigate functional properties of pumpkin seed protein isolate, adsorption and emulsifying properties, in the first place, and then to investigate the influence of modification of the protein structure, by means of enzymatic hydrolysis, on the aforementioned properties. Pumpkin seed protein isolate, IPST, and two enzymatic hydrolysates, H1 and H2, were prepared. IPST, H1 and H2 were characterized by determination of moisture, ash and protein content, then, by determination of protein recovery, molecular mass and zeta potential. Influence of the protein/peptide concentration (0.0001–1 g/100 cm3), pH (3–8) i ionic strength (0–1 mol/dm3 NaCl) on the solubility and adsorption properties: dynamic interfacial (oil/water) pressure, static surface (air/water) and interfacial (oil/water) pressure, adsorption kinetics and interfacial dilatational properties, was investigated next. In the end, influence of the aforementioned pharameters on the emulsifying properties of IPST, H1 and H2 was investigated. Emulsifying properties of IPST, H1 and H2 were discussed in terms of mean droplet diameter, droplet size distribution and emulsion stability. Protein recovery of IPST was determined to be 65 % higher than recovery of H1 and H2. Solubility of IPST was the lowest at pH 5, what presents the isoelectric point. The enzymatic hydrolysis of IPST significantly increased solubility, especialy at the isoelectric point. Increase in the ionic strenght led to salting–in or salting–out effect depending on pH of the sample. Three investigated samples, IPST, H1 and H2 exhibited surface activity, however, sufrace/interfacial pressure of H1 and H2 were found to be less influenced by change in pH or ionic strenght of the solution in comparison to the IPST. Once adsorbed to the interface IPST and both hydrolysates form interfacial film with dominant elastic component. Emulsifying properties of IPST, H1 and H2 depend on the concentration, pH and ionic strength of the continuous phase. Stabile emulsions were formed at concentration of 1 g/100 cm3 and Ic=0 mol/dm3 regardless of pH, with the exception of the IPST at pH 5. All emulsions were susceptibile to gravitational separation

The Behaviour of the Pigs Housed in Hot Climatic Conditions

The effect of high temperature on the behaviour of growing-finishing pigs was studied. The pigs were housed in a climate controlled chamber, the air temperature was kept constant at 30°C and the relative humidity was 32.5% during the whole 3 months. Aggressive behaviour and daily activities of the pigs were recorded during the light hours, from 6:00 till 18:00. Detailed observations showed that during the experiment, the pigs were most of the time lying (72%, P<0.001). Pigs spent more time lying on the floor without bedding (86.65%, P<0.01) compared to floor with bedding (13.35%, P<0.001). The second activity, which occurred most after lying was eating (16%, P<0.001) then standing (10%, P<0.001). From all observation activities, the least amount of time the pigs were sitting (1%) and moving (1%). Drinking and social contacts – aggression were less frequent. After the each week, a significant decrease in aggression was recorded (P<0.001), an aggressive contacts occurred mainly during the eating and drinking. The pigs were active with peaks in the morning and afternoon. This study confirms that the high temperature influences the behaviour of the animals; the pigs are not very active, the most of the time they are lying on the cool places without bedding

Foxboard embedded system and recognition of isolated words for control of mechatronic system

This paper describes the Fox Board embedded system, Teach-Robot mechatronic system and spectrograms, which have been chosen as a method of speech recognition. Three-windows functions were used in order to improve the recognition rate of commands. This paper demonstrates the results of improved isolated words recognition by Foxboard embedded system that can be used for control of TeachRobot mechatronic system.This paper describes the Fox Board embedded system, Teach-Robot mechatronic system and spectrograms, which have been chosen as a method of speech recognition. Three-windows functions were used in order to improve the recognition rate of commands. This paper demonstrates the results of improved isolated words recognition by Foxboard embedded system that can be used for control of TeachRobot mechatronic system

Implementation of OMG/DDS model and communication analysis

V bakalárskej práci je predstavenie OMG DDS špecifikácie, teoretické porovnanie troch najrozšírenejších implementácií OpenDDS, Vortex Opensplice a taktiež RTI Connext. V práci sú taktiež popísané dôležité rozdiely medzi dátovo zameranou publish-subscribe a objektovo zameranou client-server (napr. CORBA) komunikáciou, tiež aj využiteľnosť týchto dvoch typov v real-time systémoch. Implementácia RTI Connext je prakticky demonštrovaná na rôznych typoch v scenároch nezabezpečenej a zabezpečenej komunikácie, kde sú samotné komunikácie odchytené vo wiresharku. V zachytených prenosoch je zhodnotená bezpečnosť. Boli upravené kódy publishera a subscribera podľa potreby merania, ktorým je analyzovaná latencia komunikácie medzi rôznou veľkosťou správ. Pre spracovanie časových razítok a priemerovanie hodnôt bol vytvorený skript v jazyku python. Nakoniec je spravené kompletné porovnanie týchto scenárov a ich grafické zobrazenie.In bachelor´s thesis there is an introduction of OMG DDS specification, theoretical comparison of three most widespread implementations OpenDDS, Vortex Opensplice and RTI Connext, too. Important differences between data-focused publish-subscribe and object-focused client-server (e.g. CORBA) communication are also described in the thesis, as well as the usefulness of these two types in real-time systems. Implementation of RTI Connext is practically demonstrated on various types in scenarios of unsecured and secured communication where the communications themselves are caught in wireshark. The safety is evaluated in captured transfers. The publisher and subscriber codes were adjusted according to a need of measurement by which a communication latency between various sizes of a message is analyzed. A script in Python programming language was created for processing of timestamps and averaging values. A complete comparison of these scenarios and their graphical visual display are done in the end.

Effective management of building technologies with a focus on measuring humidity and CO2 concentration

Diplomová práca sa zaoberá automatizovaným meraním vlhkosti a koncentrácie CO2 vnútri budov, ktorého výsledky tvoria vstupné parametre pre efektívne riadenie technológií znižujúcich energetickú náročnosť budov. V úvode je približená problematika kvality vnútorneho ovzdušia budov a ukazovatele charakterizujúce túto kvalitu. Praktickú časť práce tvorí zhotovenie meracieho prípravku, ktorý obsahuje dva prototypy snímačov poskytnuté spoločnosťou Teco a.s. s online prístupom k nameraným dátam. Meranie relatívnej vlhkosti, koncentrácie CO2 a teploty vo vnútorných priestoroch budovy s hotovým prípravkom je porovnané s komerčne dostupnými zariadeniami na meranie vybraných parametrov. Pre jednoznačnú interpretáciu online dát je pre snímací prípravok nakonfigurovaný virtuálny počítač s online databázou. Záverečná diskusia je venovaná možnostiam využitia vyhotoveného snímacieho prípravku pre dosiahnutie zníženia energetickej náročnosti budov.The diploma thesis deals with automated measurement of humidity and CO2 concentration inside buildings. Results of this measurement form the input parameters for the effective management of technologies reducing the energy performance of buildings. In the introduction, the issue of indoor air quality of buildings and indicators characterizing this quality are approached. The technical part of the thesis consists of making a measuring device which contains two prototype sensors provided by Teco Inc. with online access to measured data. The measurement of relative humidity, CO2 concentration and temperature in the interior of the building with the made device is compared with commercially available devices for measuring selected parameters. For unambiguous interpretation of online data, the virtual machine with an online database is configured for the created measuring device. The possibilities of using the prepared measuring device to achieve a reduction in the energy performance of buildings are discussed in the final part.