Production of steel for castings in an electric arc furnace

Práce pojednává o elektrických obloukových pecích, zejména o elektrických obloukových pecích slévárenského typu, které se používají k výrobě ocelí na odlitky. Teoretická část nejdříve zmiňuje varianty elektrických obloukových pecí podle jejich konstrukce a místa určení. Následně se zaměřuje pouze na pece slévárenského typu, u kterých popisuje konstrukci a hlavní výrobní fáze. Praktická část se zabývá vyhodnocením skupiny taveb nízkolegované chrom-molybdenové oceli na odlitky G17CrMo9-10 z elektrické obloukové pece OTO 5.The thesis deals with electric arc furnaces, especially electric arc furnaces of the foundry-type which are used for production of steel for castings. The theoretical part first mentions variants of electric arc furnaces according to their construction and determined place. Then, it focuses only on foundry-type furnaces for which it describes construction and main production phases. The practical part deals with the evaluation of a group of melts of low-alloy chromium molybdenum steel for castings G17CrMo9-10 from the OTO 5 electric arc furnace.

Hemodynamics in Ruptured Intracranial Aneurysms

Incidental detection of unruptured intracranial aneurysms (UIA) has increased in the recent years. There is a need in the clinical community to identify those that are prone to rupture and would require preventive treatment. Hemodynamics in cerebral blood vessels plays a key role in the lifetime cycle of intracranial aneurysms (IA). Understanding their initiation, growth, and rupture or stabilization may identify those hemodynamic features that lead to aneurysm instability and rupture. Modeling hemodynamics using computational fluid dynamics (CFD) could aid in understanding the processes in the development of IA. The neurosurgical approach during operation of IA allows direct visualization of the aneurysm sac and its sampling in many cases. Detailed analysis of the quality of the aneurysm wall under the microscope, together with histological assessment of the aneurysm wall and CFD modeling, can help in building complex knowledge on the relationship between the biology of the wall and hemodynamics. Detailed CFD analysis of the rupture point can further strengthen the association between hemodynamics and rupture. In this chapter we summarize current knowledge on CFD and intracranial aneurysms

Computational Modeling of Dynamic Behaviour of Tractor

This work deals with the assessment of the effects of a rear-mounted mower on tractor dynamics. The first part summarizes knowledge of the used tractor suspension variants and their various modifications. Furthermore, the current possibilities for simulating the dynamics of tractors and the construction of the rear three-point hitch are described. The main part of the work is devoted to the assembly of the multibody model of the tractor with the rear-mounted mower. The correctness of the assembly of the virtual tractor prototype is verified by comparison with the technical experiment on the real tractor. The validated model is further used to analyse various well-defined steady-state and transient driving conditions typical of this set

Computational Modeling of Dynamic Behaviour of Tractor

This work deals with the assessment of the effects of a rear-mounted mower on tractor dynamics. The first part summarizes knowledge of the used tractor suspension variants and their various modifications. Furthermore, the current possibilities for simulating the dynamics of tractors and the construction of the rear three-point hitch are described. The main part of the work is devoted to the assembly of the multibody model of the tractor with the rear-mounted mower. The correctness of the assembly of the virtual tractor prototype is verified by comparison with the technical experiment on the real tractor. The validated model is further used to analyse various well-defined steady-state and transient driving conditions typical of this set

Creation of the educational material for adolescent, focusing on prevention of risky forms of behaviour and supporting healthy lifestyles

Katedra pedagogikyFaculty of EducationPedagogická fakult

Experimental bridging of spinal cord injury with hydrogels

Hydrogels are biomaterials used in the treatment of experimental spinal cord injury (SCI). In a model of acute SCI, we implanted hydrogels based on 2-hydroxyethylmethacrylate (HEMA) and hydroxypropylmethacryla-mide (HPMA). One month after implantation the hydrogels bridged the cavity, adhered well to the spinal cord and created permissive environment, infiltrated with blood vessels, axons and Schwann cells. Physical modifications (e.g. surface charge) of hydrogels may improve bridging of acute SCI. We implanted hydrogels based on HEMA with a surface charge in spinal cord hemisection and compared with a hydrogel without charge. Hydrogels with surface charge improved connective tissue adhesion and growth of axons compared to a hydrogel without charge. Biodegradable hydrogels may bridge a lesion followed by complete re-sorption. In a model of acute SCI we implanted hydrogels based on the copolymer of HPMA and etoxyethylmethacrylate (EOMA) degraded from the periphery, which was substituted with new tissue after 1 month, to the center, comprising amorphous residuals of the hydrogel. Delayed hydrogel implantation may improve bridging of spinal cord le-sion. We implanted hydrogels based on HEMA acutely or in a delayed fashion (after 7 days) in spinal cord transection. Delayed implantation re-duced the volume of..

Experimental bridging of spinal cord injury with hydrogels

Hydrogels are biomaterials used in the treatment of experimental spinal cord injury (SCI). In a model of acute SCI, we implanted hydrogels based on 2-hydroxyethylmethacrylate (HEMA) and hydroxypropylmethacryla-mide (HPMA). One month after implantation the hydrogels bridged the cavity, adhered well to the spinal cord and created permissive environment, infiltrated with blood vessels, axons and Schwann cells. Physical modifications (e.g. surface charge) of hydrogels may improve bridging of acute SCI. We implanted hydrogels based on HEMA with a surface charge in spinal cord hemisection and compared with a hydrogel without charge. Hydrogels with surface charge improved connective tissue adhesion and growth of axons compared to a hydrogel without charge. Biodegradable hydrogels may bridge a lesion followed by complete re-sorption. In a model of acute SCI we implanted hydrogels based on the copolymer of HPMA and etoxyethylmethacrylate (EOMA) degraded from the periphery, which was substituted with new tissue after 1 month, to the center, comprising amorphous residuals of the hydrogel. Delayed hydrogel implantation may improve bridging of spinal cord le-sion. We implanted hydrogels based on HEMA acutely or in a delayed fashion (after 7 days) in spinal cord transection. Delayed implantation re-duced the volume of..