27 research outputs found
Magnetic and Magneto-Optical Properties of Fe75-xMn25Gax Heusler-like Compounds
Fe75-xMn25Gax Heusler-like compounds were investigated in a wide range of Fe/Ga ratios while keeping the Mn content constant and equal 25 at% in order to elucidate the interplay between magnetic properties and composition. Materials were prepared by arc-melting from pure elements and subsequently annealed. Experimental investigations were focused on magnetization behavior in a wide temperature range from 4 to 1000 K and magnetic field up to 9 T. Optical and magneto-optical (MO) measurements were employed to shed more light on the magnetic state and electronic structure of investigated materials. Magnetization measurements indicated that in the vicinity of stoichiometry (Fe2MnGa) the compounds are ferro/ferrimagnetic, whereas the Fe-deficient compound is paramagnetic and at high Fe concentration the antiferromagnetic interaction prevails. Theoretical calculations of corresponding ordered and disordered stoichiometric compounds were carried out and compared to the experiment on the level of net magnetic moment as well as magneto-optical spectra. This comparison suggests that the Heusler crystal structure, L2(1), is not present even close to stoichiometry. Moreover, the comparison of density of states (DOS) for ordered and disordered structures allowed us to explain missing martensitic transformation (MT) in investigated materials
Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae
We systematically surveyed period variations of superhumps in SU UMa-type
dwarf novae based on newly obtained data and past publications. In many
systems, the evolution of superhump period are found to be composed of three
distinct stages: early evolutionary stage with a longer superhump period,
middle stage with systematically varying periods, final stage with a shorter,
stable superhump period. During the middle stage, many systems with superhump
periods less than 0.08 d show positive period derivatives. Contrary to the
earlier claim, we found no clear evidence for variation of period derivatives
between superoutburst of the same object. We present an interpretation that the
lengthening of the superhump period is a result of outward propagation of the
eccentricity wave and is limited by the radius near the tidal truncation. We
interpret that late stage superhumps are rejuvenized excitation of 3:1
resonance when the superhumps in the outer disk is effectively quenched. Many
of WZ Sge-type dwarf novae showed long-enduring superhumps during the
post-superoutburst stage having periods longer than those during the main
superoutburst. The period derivatives in WZ Sge-type dwarf novae are found to
be strongly correlated with the fractional superhump excess, or consequently,
mass ratio. WZ Sge-type dwarf novae with a long-lasting rebrightening or with
multiple rebrightenings tend to have smaller period derivatives and are
excellent candidate for the systems around or after the period minimum of
evolution of cataclysmic variables (abridged).Comment: 239 pages, 225 figures, PASJ accepte
Effective tax rates of personal income tax in EU countries
This bachelor work focuses on tax burden and development of tax progressivity of personal income taxes in years 2000 - 2009 in EU contries, specifically in Germany, Austria, Czech republic, Slovakia and Poland. The aim of this work is to define taxable income in each country and compare the tax progressivity in years 2000 - 2009
Assistive technologies for elderly and disabled persons
Cílem předložené diplomové práce je seznámit čtenáře s technologiemi asistovaného bydlení v domácnosti (AAL - Ambient assisted living) a s jejich využitím pro dohled nad samostatně žijícími stárnoucími osobami. Hlavním důvodem, proč se zabývat technologií Ambient Assisted Living, je stárnutí populace jak u nás, tak i v celém světě. Obsahem práce je seznámit čtenáře s technologií AAL systémů a jejím využití v reálném prostředí a následném hodnocení jak od monitorovaných osob, tak od pečovatelských pracovníků. Přínosem diplomové práce je mimo jiné také praktická demonstrace možnosti využití termokamery v AAL systémech a vyhodnocení různých modelových situací.ObhájenoThis diploma thesis aims is to acquaint readers with the technologies of assisted living in the home (AAL - Ambient assisted living) and their use for the supervision of single elderly people. The main reason to deal with Ambient Assisted Living technology is the aging of the population both in our country and around the world. The content of the work is to acquaint the reader with the technology of AAL systems and their use in the real environment and subsequent evaluation from both monitored persons and caregivers. The contribution of the diploma thesis is, among other things, a practical demonstration of the possibility of using a thermal camera in AAL systems and evaluation of various model situations
Messianism in Abrahamic Religions: Religious Expectations and Its Importance for Interreligious Dialogue
Diploma work abstract I based my work on the research of messianic topic in holy texts of Abrahamaic religions, what means an research on TNK (Old Testament), New Testament and Quran (including the early islamic tradition). I tried to bring a frame of a possible common dialogue based on the shared religious expectation towards common world ethos
Messianism in Abrahamic Religions: Religious Expectations and Its Importance for Interreligious Dialogue
Diploma work abstract I based my work on the research of messianic topic in holy texts of Abrahamaic religions, what means an research on TNK (Old Testament), New Testament and Quran (including the early islamic tradition). I tried to bring a frame of a possible common dialogue based on the shared religious expectation towards common world ethos
Production of the "Cover" component
The thesis proposes the production design of a cover component used as a ventilator cover of a water pump. In compliance with the studied literature, the cover will be made from polypropylene using the injection moulding technology. Based on the technological calculations, it puts forward a complete double mould with a cold inlet. The design solution was verified by simulations of filling and cooling, and a suitable injection machine was selected as per the calculated parameters. Finally the thesis explores the possibility for defects and presents the technical-economic evaluation for the entire production