Design and manufacturing of clamping fixture for guide vane ring

Tato diplomová práce se zabývá návrhem maskovacího přípravku určeného pro strojní leštění funkčních ploch lopatkového kola turbíny leteckého motoru, které je prováděno na leštícím stroji LPG1 od firmy SPM. Na základě tohoto konceptu byla realizována i samotná výroba zmíněného přípravku, která je popsána v praktické části této práce. Teoretická část práce je zaměřena na možnosti a metody technologií povrchových úprav omílání a leštění. V souvislosti s tím se práce dále zabývá výčtem nejvýznamnějších světových prodejců strojních zařízení pro dané technologie povrchových úprav.This diploma thesis deals with design of clamping fixture for machine polishing of functional surfaces at the aircraft engine guide vane ring, which is done on the polishing machine LPG1 from SPM company. Based on this concept was realized mentioned fixture machining, which is described in practical part of this thesis. The theoretical part of this thesis is focused on possibilities and methods of tumbling and polishing as a surface treatment technology. In connection with the previous text is also listed the enumeration of the most significant global sellers of machines for these surface treatment technologies

Research of the influence surface finishing TPV sealing to abrasion of car body paint

katedra: KMT; přílohy: 1 CD ROM, 2 výkresy A3, 1 výkres A1; rozsah: 41 s. (46 288znaků)The bachalor work deals with the influence of sealing lips material structure to abrasion of car body paint. The goal is to define testing methodic of material samples on the vibrating equipment (shaker) and to choose suitable surface finishing and material structure of lips in contact with car body. Theoretic part contains explanation of elementary terms about polymers. The description of termoplastic elastomer (TPE) material properties and comparsion with classical elastomers based on cautchouc. Explanation of the term thermoplastic vulcanisate (TPV) and its application in sealing systems in automotive. Finally describes surface finishing methods destined to reduce friction of sealing lips in contact with glass or car body. Experimental part describes process proposing and realisation tests on shaker. The first part is determined for pre-test stage. Consecutive tuning the test configuration to get as most realistic conditions as possible. There is explained and shown on specific examples corrections of boundary conditions to finaly form based on inputs from real situations and experience. The second part is about own course of testing and results evaluation.Bakalářská práce se zabývá vlivem materiálového složení těsnících jazyků na otěr laku karoserie vozu. Jejím účelem je určit metodiku zkoušení materiálových vzorků na vibračním zařízení (dále jen shaker), výběr vhodné povrchové úpravy a struktury těsnících jazyků, které jsou v kontaktu s karoserií. Teoretická část obsahuje rozbor základních pojmů z oblasti polymerů. Popis materiálových vlastností termoplastického elastomeru (dále jen TPE) v porovnání s klasickými elastomery na bázi kaučuku. Vysvětlení pojmu termoplastický vulkanizát (dále jen TPV) a jeho použití v těsnících systémech v automobilovém průmyslu. Konečně pak pojednává o užívaných povrchových úpravách určených ke snížení tření těsnících jazyků, které jsou v kontaktu se sklem, nebo karoserií automobilu. Experimentální část popisuje postup při navrhování a realizaci zkoušky na shakeru. První část je věnována stadiu pretestů. Postupnému ladění konfigurace zkoušky tak, aby bylo docíleno co nejreálnějších podmínek. Je zde vysvětleno a ukázáno na konkrétních příkladech, jak se na základě vstupů z reálných situací a zkušeností upravovaly okrajové podmínky zkoušky, až k finální podobě. Druhá část se zabývá samotným průběhem zkoušení a vyhodnocování výsledků

Výroba a ověření prototypu dvoukomponentního dílu pro těsnění spáry A-sloupku

Diplomová práce se zabývá procesem výroby prototypu dvoukomponentního dílu těsnění spáry A-sloupku metodou vakuového lití polyuretanu do silikonové formy, včetně ověření jeho funkce v porovnáním s dílem ze sériové výroby. Originální díl zároveň slouží jako vstup pro získání CAD dat metodami reverzního inženýrství. Proces výroby prototypového nástroje, jeho ověření a výroba vzorků těsnění je realizováno v laboratoři oddělení vývoje firmy Henniges Automotive.The thesis describes the production process of prototype two-compoment A-pillar gap sealing by casting of polyurethane into the silicone mould in vacuum. Afterwards verification of function in comparison to the serial production part. Original part simultaneously works as the input to obtain the CAD data by the reverse engineering methodes. Production process and verification of the prototype tool and samples of sealing is realized in the laboratory of the company Henniges Automotive development department

Natal dispersal based on past and present environmental phenology in the pied flycatcher (Ficedula hypoleuca)

this is the postprint version of the article. the published version of the article can be found at www.springerlink.comNatal dispersal allows individuals to reach suitable breeding sites. The effect of present plant phenology as a cue for dispersal into areas with favourable stages of development has been well established across avian and mammalian taxa. However, the effect of past experience is less understood. We studied the effect of past and present phenology of the environment on the direction and distance of natal dispersal in a passerine bird, the pied flycatcher (Ficedula hypoleuca). We monitored spring settlement of local recruits in six nest box plots along a 10-km stretch of a south-north gradient of plant and caterpillar food development. We found that males used both past experience of caterpillar phenology from early life and actual plant phenology during the recruitment season as independent cues for breeding settlement. Males that had experienced a mismatch with the caterpillar food peak as a nestling, and/or those that arrived late in the spring in the recruitment year, moved north of their natal site, whereas males that had experienced a better match with the caterpillars as a nestling, and/or those that migrated earlier in the spring, settled at a similar site or more to the south. In females, no such effects were found, suggesting that the usage of phenological cues is sex specific. In summary, tracking environmental phenology by natal dispersal may represent an effective mechanism for settling in new favourable areas, and may thus potentially cause rapid change of a species’ geographical breeding range in response to climate change.2014-12-3

(R)-2-{2-[(S)-(2′-Benzo­yloxy-1,1′-binaphthyl-2-yl)oxycarbonyl­amino]-3-phenylpropanamido­meth­yl}pyridinium picrate acetone solvate

In the crystal structure of the title compound, C43H34N3O5 +·C6H2N3O7 −·C3H6O, the large dimension and shape of the cation are responsible for the elongation of the ortho­rhom­bic unit cell. The ions and acetone mol­ecules are linked together by a system of hydrogen bonds involving an inter­molecular hydrogen bond between one N atom of the cation and the O atom of acetone and two inter­molecular hydrogen bonds between the cation N atoms and the O atoms of the picrate anion. No intra­molecular hydrogen bonds exist in the structure. The dihedral angle between the two naphthalene ring systems is 76.16 (13)°. The chiral C atom has a known R configuration, but this cannot be confirmed from this X-ray analysis

Long-Term Cold Acclimation Extends Survival Time at 0°C and Modifies the Metabolomic Profiles of the Larvae of the Fruit Fly Drosophila melanogaster

Drosophila melanogaster is a chill-susceptible insect. Previous studies on this fly focused on acute direct chilling injury during cold shock and showed that lower lethal temperature (LLT, approximately -5°C) exhibits relatively low plasticity and that acclimations, both rapid cold hardening (RCH) and long-term cold acclimation, shift the LLT by only a few degrees at the maximum.We found that long-term cold acclimation considerably improved cold tolerance in fully grown third-instar larvae of D. melanogaster. A comparison of the larvae acclimated at constant 25°C with those acclimated at constant 15°C followed by constant 6°C for 2 d (15°C→6°C) showed that long-term cold acclimation extended the lethal time for 50% of the population (Lt(50)) during exposure to constant 0°C as much as 630-fold (from 0.137 h to 86.658 h). Such marked physiological plasticity in Lt(50) (in contrast to LLT) suggested that chronic indirect chilling injury at 0°C differs from that caused by cold shock. Long-term cold acclimation modified the metabolomic profiles of the larvae. Accumulations of proline (up to 17.7 mM) and trehalose (up to 36.5 mM) were the two most prominent responses. In addition, restructuring of the glycerophospholipid composition of biological membranes was observed. The relative proportion of glycerophosphoethanolamines (especially those with linoleic acid at the sn-2 position) increased at the expense of glycerophosphocholines.Third-instar larvae of D. melanogaster improved their cold tolerance in response to long-term cold acclimation and showed metabolic potential for the accumulation of proline and trehalose and for membrane restructuring

Analysis of the effectiveness of the penalty kick in "the Champions League" in 2009-2019

In this bachelor's thesis, we analyse all penalty kicks that were played in the UEFA Champions League over a 10-year period (2009-2019) in terms of performance efficiency. The aim of our work is to analyse and compare penalty kicks using rating scales in the UEFA Champions League during a period of 10 seasons. The partial aim is to create a profile of the so-called ideal shooter. In the analytical part of the work, we look at the historical and organisational analysis of the penalty kick and the basic characteristics of football, as well as the structure of football competitions. In the synthetic part of the work, we then analysed all the recorded penalty kicks from a total of 1250 matches and created rating scales and categories according to different specificities. Based on the data collected, we were also able to create a profile of the so-called ideal shooter. Despite obtaining successful results, we believe that the final values cannot be applied uniformly to all football competitions because of the different quality of players, clubs, competitions, and the uniqueness of this standard situation