This thesis deals with the influence of hod dip galvanizing on properties of high-strenght steel. Galvanizing adversely affects the mechanical properties of high-strenght steel. This paper also examines the influence of hod dip galvanizing at hardness high-strenght steels. The task is to assess how the yield stress can galvanize steel.

The aim of this thesis is to design a powertrain of unconvential V-6 diesel engine with balancing shift with angel of cylinders’s axis 90 degrees and crank pin ofset of 30 degrees. The thesis provides an analysis of balance of inertial forces and their moments, layout of counterbalances on crankshaft and balancing shaft. It also provides a layout of discrete model of torsional cranksaft mechanism and layout of rubber damper of torsional oscillations.

This thesis addresses the design of ultralight aircraft as a one regulation UL-2 and basic aerodynamics characteristics of the individual parts of the airplane. Furthermore, we discuss the production process and the production itself tail and static strenght tests.

The thesis is dealing with the design proposal of mobile handling equipment for the aircrafts´ overhead accessory. In its initial part it describes different types of manipulators in use, following by several possibilities how to solve the problematics. The main part of the thesis is focused on concrete solution and construction of such manipulating facility, including the strength and control calculations.

This diploma thesis deals with the construction design of revolving column crane which is used for manipulation with metal plates for metal shears and bending bench. The aim is to set main proportions and basic parameters for the designed steel construction via design calculation. Then the thesis deals with checking of strength analysis done by programme I-DEAS NX 11. Suggestion of disposal placement of the crane, choice of hoist, travelling system, auxiliary device and drawing documentation are also parts of the design.

This diploma thesis deals with the measurement of mechanical properties and accelerated aging of monoaxially stretched polyethylene strips coming from three types of polymeric mesh, which serves to pack hay on baling machines. The strength of the strips is evaluated from two points of view. The first one is static tensile strength measured before and after accelerated aging at 23 °C and 40 °C, the second one determines the strength as the weight that causes the strip failure on a simple machine at 23, 40, 60 and 80 ° C. The results show that the smallest static strength has the least stabilized strip, which, on the other hand, revealed the highest strength in a dynamic loading. The change of supermolecular structure was evaluated by calorimetric measurements. The data shown only very little change of inner structure due to the average response of the whole crystalline phase comprising relatively wide distribution of crystallites. It is more than probable that supermolecular structure had been changed but the method is not sensitive to see the change of orientation of lamellae and macromolecular chains in them.

Title: The influence of whole-body electromyostimulation on muscle strength and body composition in healthy individuals Objectives: The aim of the diploma thesis is to collect and give comprehensive theoretical information concerning the whole body electromyostimulation topic. Furthermore, find out what the effect of the whole body electromyostimulation method on body weight, fat-free mass, body fat and other parameters of body composition. The aim of this work is to verify whether it is possible to achieve changes in bone mineral density values by means of the WB-EMS method or to increase maximal isometric muscle strength in healthy individuals. Methods: The diploma thesis is an intragroup experiment. The method of qualitative research was used for data collection. Bioelectric impedance analysis was used to evaluate body composition. DXA (Dual Energy X-Ray Absorptiometry) was used to assess bone mineral density and body composition, and isometric muscle strength was evaluated using isometric dynamometry. The research group consisted of 10 young and healthy probands (average age 23.9 years). Probands completed 10 exercise units using the whole body electromyostimulation method. The frequency of exercise was once a week. Results: We have found that after ten weeks of using the whole-body...

The master´s thesis deals with the volume changes of concrete during its concrete glow. These volume changes are generally more susceptible to high-strength concretes – HSC, which contain a bigger dose of binder. The theoretical section describes the possible reduction volume change especially in HSC, which are focused on the composition of concrete, especially on the type and particle size distribution of aggregate. Then attention is also paid to the different types of cements and their possible substitution. The part of the theoretical work describes the types of volume changes that may occur. In the experimental part are suggested the HSC by to secure informations. Different kinds of aggregates are used and a continuous or discontinuous grain curve and a different maximum grain size. Part of the sample was made only from CEM I 42,5 R and the second part of the sample from CEM I 42,5 R with the addition of very finely ground limestone. In terms of the part of the work were monitored volume changes of concrete with different composition and also their mechanical properties after 7, 28 and 90 days. Specifically, compressive strength, tensile strength, strength of the surface layers of concrete, water absorption and water-permeability test concrete. In conclusion, are listed all the results of tests.

Bakgrund: Lateral fotledsstukning är en av de vanligaste traumatiska muskuloskeletala skadorna och av alla som ådrar sig denna skada utvecklar upp till 40 procent något som kallas kronisk ankelinstabilitet. Det är en skadeform som förekommer inom nästan alla idrotter. Typiskt är en kraftig stukning som följs av ytterligare stukningar och instabilitetskänsla. Konsekvenser är ofta nedsatt kraft, balans och prestationsförmåga. Syftet med denna studie var således att undersöka fotledsfunktion med avseende på styrka, balans och funktionella tester hos personer med kronisk ankelinstabilitet. Metod: Studien genomfördes som en tvärsnittsstudie med tester vid ett tillfälle. Deltagare söktes via idrottsföreningar och distriktsmottagning. Totalt inkluderades 17 personer (10 kvinnor och sju män), med kronisk fotledsinstabilitet, vilka utförde fem tester för att utvärdera balans, styrka och funktionell prestationsförmåga. Testerna utgjordes av enbentstående, isometrisk styrka i inversion och eversion i liggande, samt enbent längdhopp och sidohopp.  Resultat:  Skadad sida var signifikant svagare jämfört med frisk sida i både eversion (75N respektive 92N, p=0,001) och inversion (75N respektive 85N, p=0,002). Deltagarna visade också sämre prestation, på skadad sida jämfört med frisk sida, vid enbentshopp (101cm respektive 107cm, p=0,05) samt i sidohopptestet (antal 30 respektive 39, p<0,001). Balansen var också nedsatt i skadad jämfört med frisk sida (poäng 17 respektive 11, p<0,001). Det fanns en signifikant korrelation mellan styrka i eversion och inversion (r=0,731, p=0,001). Inversion hade, utöver eversion, signifikanta korrelationer med enbentshopp (r=0,517, p=0,033), och med sidohopp (r=0,644, p=0,005). Enbentshopp korrelerade även med sidohopp (r=0,650, p=0,005). Antal sidohopp hade en hög korrelation, (p <0.01), med samtliga övriga parametrar, undantagen balans. Det förelåg ingen korrelation mellan balansen och några av övriga parametrar (p ≥0,600). Konklusion: Den här studien visar att individer med kronisk ankelinstabilitet har sämre funktion i skadad jämfört med frisk fot. Funktionell prestationsförmåga, i form av sidohopp, och balans var de variabler som var mest påverkade. Det faktum att det fanns en 50-procentig skillnad i balans tyder på att utvärdering av balans är av betydelse i denna grupp av patienter och att rehabilitering bör syfta till att förbättra balansförmågan. / Background: Lateral ankle sprain is one of the most common traumatic musculoskeletal injuries, is present in almost all fields of sport, and up to 40 percent of everyone that is injured developes something called chronic ankle instability. A typical description is a severe strain followed by more straines and a sense of instability. Strenght, balance and performance deficits are often seen consequences of the disorder. Objective: The aim of this study was to survey the function concerning strenght, balance and functional ability within this group. Methods: This study was conducted as a cross-sectional study with participants recruited through various sport clubs and at a clinical practice. A total of 17 persons with chronic ankle instability were included (10 women and seven men). The test battery consisted of five tests for assessment of balance, strength and functional performance; Single leg balance, isometric strength in inversion and eversion, single leg hop and side hop test Result: The affected side was signifikantly weaker compared to the non-affected side in both eversion (75N vs. 92N, p=0,001) and inversion (57N vs 85N, p=0,002). The same pattern was seen, with a lesser performance on the affected side in, single leg hop (101cm vs. 107cm p=0,05) and number of sidehops (30 vs. 39, p <0,001). The balance was also lesser in the affected versus non-affected side (17 vs. 11, p <0,001). There were a signifikant correlation between strenght in eversion and inversion (r=0,731, p=0,001). Inversion strenght had also signifikant correlationes with the performance in the single leg hop (r=0,517, p=0,033), and the side hop tests (r=0,644, p=0,005). Single leg hop also correlated with the side hop performance (r=0,650, p=0,005). The performance in the side hop test had high correlation, (p <0.010), with every other parameter except balance which did not correlate with any of the other tests (p ≥0,600).  Conklusion: In this study, strength, balance and functional performance were all impaired at the injured side, compared to the non-injured side. The fact that there was a 50% difference between sides in balance performance suggests that evaluation of balance is of importance in this group of patients and rehabilitation should aim to improve balance.

This research work proposes methods to rises the resistance and to evaluate the behavior of confined masonry walls built from clay solid bricks. These elements are widely used in Guerrero State (México) to build masonry structures, which should resist high lateral loads because of the serious seismic hazard. Therefore, a large experimental program to evaluate the mechanical properties of bricks and masonry currently required in the design process and masonry analysis was developed. To rises the masonry resistance and to counteract the influence of the compressive strength of the pieces on the masonry behavior, a high compressive strength mortar and a metallic reinforcement inside the joints were used. With respect to referenced values of the mechanical properties, some were similar and others were twice bigger. In this country zone, the first three tests under lateral load on full-scale confined masonry walls built from clay solid bricks were carried out in order to evaluate its behavior. A reinforcement composed by metallic hexagonal mesh-mortar coat was placed on the faces of two walls to rise or to restore the resistance. The walls showed good behavior and the reinforcement had adequate structural efficiency. Numerical models of panels and walls built by using the experimental data evaluated the envelope resistance, the failure mode and showed the influence of the mechanical properties of the pieces and joints on the global behavior. Two models had metallic reinforcement inside the joints. In addition, a constitutive law of the masonry defined from experimental results allowed to elaborate a simple model, which results were concordant with respect to the experimental results and similar to those calculated by complex models. Finally, two simplified models to evaluate the resistance of confined masonry walls by considering the failure plane on the wall diagonal were developed. One supposes the masonry failure by shear effect and the other supposes the masonry failure by induced tension. The ratio theoretical resistance vs. experimental resistance was adequate for walls built from different materials and tested under different loads, which had ratio Height/Length ranging from 0.74 to 1.26