Background: Balance is important for performing activities and sports in daily life. Although it is widely accepted, that warming up can increase readiness for exercise, the effect of warming up on balance is unclear as results vary between studies. As warm-up can potentially affect the Star Excursion Balance Test (SEBT) results and physiotherapists use tests to evaluate the effects of interventions, it is important to perform tests in a standardised way. Aim: To investigate the effect of warm-up on dynamic control among injury-free 20–30 year old individuals. Design: Randomised cross-over study. Method: 18 participants performed test A and B, where test A included a warm-up programme and SEBT, and B included only SEBT. The test each participant started with was randomised. Normalised and composite SEBT scores were used to analyse the data. Result: There was no statistically significant difference in SEBT scores for either the dominant or non-dominant leg when compared with and without warm-up. When analysing the difference in mean (SEBT composite %) between with and without warm-up for dominant versus non-dominant legs, a small but significant difference was seen, in the form of a positive effect of warm-up for the non-dominant leg. Conclusion: The results showed that warm-up had no statistically significant effect on either the dominant or non-dominant leg. The difference between the effect of warm-up on the dominant and non-dominant leg was statistically significant as the non-dominant leg was not affected in the same way. Further research is needed to confirm these results. / Bakgrund: Balans är viktigt för att kunna genomföra aktiviteter och idrott i det dagliga livet. Även om det är allmänt accepterat att uppvärmning kan öka beredskap för träningen, är effekten av uppvärmning på balansen oklar då resultaten varierar mellan olika studier. Då uppvärmning kan potentiellt påverka testresultatet vad gäller Star Excursion Balance Test (SEBT) och fysioterapeuter använder tester för att kunna utvärdera effekter av interventioner, är det viktigt att utföra tester på ett standardiserande sätt. Syfte: Att undersöka vilken effekt uppvärmning har på dynamisk kontroll hos skadefria 20–30 år gamla individer. Design: Randomiserad cross-overstudie. Metod: 18 deltagare utförde test A och B, där test A inkluderade ett uppvärmningsprogram och SEBT, och B inkluderade bara SEBT. Testet varje deltagare började med slumpades ut. Normaliserade och sammansatta SEBT-poäng användes för att analysera data.   Resultat: Det förelåg ingen statistiskt signifikant skillnad i SEBT-poäng för vare sig det dominanta eller icke-dominanta benet vid jämförelse med respektive utan uppvärmning. Vid analys av skillnad i medelvärde (SEBT sammansatt %) mellan uppvärmning och inte för dominanta jämfört med icke-dominanta ben sågs en liten, men signifikant skillnad, i form av positiv effekt på uppvärmning för det icke-dominanta benet.  Konklusion: Resultaten visade att uppvärmning inte hade någon statistiskt säkerställd effekt på varken det dominanta och icke-dominanta benet. Skillnaden mellan hur uppvärmningen påverkat det dominanta och icke-dominanta benet var statistiskt signifikant då det ickedominanta benet påverkades inte på samma sätt. Ytterligare forskning behövs för att bekräfta dessa resultat.

The Toarcian Oceanic Anoxic Event (T-OAE; ~183 million years ago) represents an interval during the Mesozoic when the emplacement of the Karoo-Ferrar Large Igneous Province (LIP) is thought to have resulted in significant environmental change. Associated with this interval was the widespread deposition of organic-rich sediments, carbon cycle and seawater chemistry changes, global warming, the development of marine anoxia, and major extinction events. The majority of studies of this event that have documented these responses have come from the Boreal and Tethyan regions of Europe, thus casting some doubt to the regional versus global significance of the event. Thus my dissertation has sought to reconstruct biogeochemical and paleoenvironmental changes across the T-OAE from a sedimentary succession that was deposited on the margins of a different ocean basin away from the well-studied European successions. Specifically, I have studied the chemostratigraphy of the Fernie Formation of the Western Canada Sedimentary Basin (WCSB), which was deposited on the eastern margin of the Panthalassa Ocean. The Toarcian carbon isotope excursions (CIEs) in the WCSB confirm that these features are global phenomena. I have suggested a new driver for small-scale CIEs observed during the event: the release of wetland-derived methane during progressive global warming. The osmium isotope record and numerical modeling of the osmium cycle suggests that continental weathering rates increased during the T-OAE by 230 – 540%. Rhenium abundance data also suggests that the increased geographic extent of marine anoxia during the T-OAE caused a global drawdown in the seawater rhenium inventory. Iron speciation data are used to reconstruct redox conditions within the WCSB, which suggest ferruginous conditions developed in the more distal locations at the onset of the T-OAE before returning to euxinic (anoxic and sulfidic) conditions. This is likely related to enhanced pyrite burial on a global scale, which caused the drawdown of the seawater sulfate inventory, thus limiting pyrite formation in the distal locations. The proximal setting remained euxinic across the T-OAE, and in all locations the iron speciation data suggest anoxic conditions persistent well after the interval that has been traditionally called the end of the T-OAE. / Ph. D.

Parmi les méthodes de reconstitution de l'histoire du champ géomagnétique, l'étude des variations de la production atmosphérique d'isotopes cosmogéniques s'est récemment développé. Cette production est modulée au premier ordre et aux échelles multimillénaires par l'intensité du champ géomagnétique. Son enregistrement dans les archives de l'environnement terrestre en apporte une lecture indépendante, donc complémentaire des méthodes paléomagnétiques. Ce travail vise à retracer les changements de taux de production de 10Be enregistrés dans les sédiments marins, afin de restituer les variations du moment géomagnétique depuis environ 800 000 ans. Les rapports 10Be/9Be authigéniques mesurés par Spectrométrie de Masse par Accélérateur le long de trois séquences de différentes latitudes, permettent de caractériser la production globale de 10Be sur deux intervalles de temps. (1) Lors de la baisse du moment dipolaire associée à l'excursion Laschamp (~41 000 ans BP), la surproduction de 10Be à 38°N et 2°S, confirmée par des mesures de 10Be/230Thxs, est identique à celle restituée dans les glaces du Groenland. (2) L'étude menée sur une carotte prélevée à l'équateur couvrant l'intervalle 800 000 – 250 000 ans BP (époque Brunhes), révèle les phases successives de surproduction globale de 10Be déclenchées par les chutes de moment dipolaires liées à l'inversion Brunhes-Matuyama d'une part et d'autre part à une dizaine d'excursions documentées. La calibration de ces enregistrements avec des valeurs absolues disponibles dans la littérature permet la quantification des moments dipolaires. / Among the methods for reconstructing the geomagnetic field history, studying the variations in cosmogenic isotopes production in the atmosphere has recently developed. At multi millennial scales, this production is mainly modulated by the geomagnetic field intensity. Its record in terrestrial archives provides an independent reading to complement paleomagnetic methods. This work aims at tracing the changes in 10Be production rates recorded in marine sediments, in order to reproduce the geomagnetic variations for the past 800,000 years. Authigenic 10Be/9Be ratios measured using Accelerator Mass Spectrometry along three sequences from different latitudes, characterize the 10Be global production during two time intervals. (1) During the dipole moment low associated with the Laschamp excursion (~ 41,000 years BP), the 10Be overproduction at 38°N and 2°S, confirmed by measurements of 10Be/230Thxs, is identical to that recorded in the Greenland ice sheet. (2) Studying a core collected near the equator and covering the interval 800,000 – 250,000 years BP (Brunhes epoch) reveals the successive phases of global 10Be overproductions triggered by dipole moment lows associated to the Brunhes-Matuyama reversal and also to several other documented excursions. Calibrating these records with absolute values available in the literature allows quantifying dipole moments. These are then compared to paleomagnetic reference reconstructions over the same time series. Bearing out the number and extent of these dipole field lows allows considering to refine their chronology before using their features to get a better understanding of the geodynamo rhythms throughout the last Million years.

The diploma thesis is focused on the current state evaluation of conditions and implementation of educational excursion in the Czech Republic and the economic impact of existing alternatives. The theoretical part defines the educational tourism's market and delimits the educational excursion's peculiarities. The thesis also contains interviews with high school representatives who organize the educational excursions in their practice and the results of questionnaire of secondary schools. The comparison of obtained information reflects the current state of educational excursion's implementation in the Czech Republic. Output of this work is evaluation of educational excursion's direct economic impact.

The excursion is designed for pupils of the 2nd grade of six-year grammar school, for pupils of the 1st grade of four - year grammar school or pupils of the 9th grade of basic school with a view to tie together with subject matter of natural science and geography. The excursion targets the mineralogic - geological exposition of the museum and the history and mining methods in the region.

Bakgrund: Knäskador är vanligt förekommande bland yngre fysiskt aktiva personer. Ofta skadas flera strukturer samtidigt vilket medför att den mekaniska stabiliteten i knäleden försämras samt att den neuromuskulära funktionen i benet försämras, vilket påverkar den posturala kontrollen samt stabiliteten på knät. För att upptäcka instabilitet behövs mer utmanande och specifika test som Star Excursion Balance Test (SEBT). I dagsläget saknas studier gjorda med SEBT på en svensk population. Fysioterapeuter är beroende av tillförlitliga instrument för att kunna göra en korrekt bedömning. Syfte: Syftet med studien var att undersöka test-retest reliabiliteten för SEBT samt att undersöka samtidig validitet mellan SEBT och Unilateral Stance test (UST) för personer med knäproblematik.Syftet var dessutom att undersöka hur den posturala kontrollen var för personer i åldrarna 20-30 år med knäproblematik mätt med SEBT och UST. Metod: Studien var gjord med en icke experimentell design som var både deskriptiv och korrelerande. Alla tester gjordes vid ett tillfälle med 5 minuters vila mellan testerna. I studien ingick 30 personer med diagnostiserad alternativt självupplevd knäproblematik i åldern 20-30 år som studerade på Biomedicinskt centrum vid Uppsala Universitet. Resultat: Den posturala kontrollen för testpersonerna (n=30) var uppmätt till god både mätt med både SEBT och UST. Validiteten mellan SEBT och UST var låg r=0,3 (p=0,12). Test-retest reliabiliteten för SEBT var god r=0,74 (p=0.00013). Konklusion: SEBT har en god interbedömarreliabilitet. Korrelationen mellan UST och SEBT var låg. SEBT är ett test som är ett väldigt specifikt test där man behöver både material och tid för utförandet. Det behövs mer studier för att få fram om testet går att användas effektivt på allmänna kliniker som ett utvärderingsinstrument för postural kontroll. Keywords: Postural balance, Dynamic balance, Reliability, Validity, Star excursion balance test (SEBT), Unilateral stance test (UST), knee injury.

Title: Density of Minkowski functionals of stationary random sets Author: Bc. Filip Dohnálek Department: Department of Probability and Mathematical Statistics Supervisor: prof. RNDr. Jan Rataj, CSc., Mathematical Institute of Charles University Abstract: In the presented work we can find the created theory of random closed excursion set generated by means of Gaussian real random field. We specialize in a real random field, which is defined on the regular stratified manifold. The text includes a determination of conditions for a random field and stratified manifold in which densities of the intrinsic volumes for excursion sets exist. Then subsequently attributes and relations of the excursion set are derived for the existence of densities of the intrinsic volumes. Finally, a simulated study is made where we compare theoretical and estimated values of densities. This is followed by a discussion on the results, which we compare to the Boolean model. Keywords: Densities of the intrinsic volume, Excursion set, Manifold, Real random field

This study investigated the impact of three edaphic factors on the distribution of forest plants in Sweden. Based on 2657 plots with 22 common species, Canonical Correspondence Analysis (CCA) and Generalized-linear-model (GLM) were performed with pH measurements in the top layer of the soil, latitude and deciduous tree proportion as explanatory variables. Variation of the species occurrence could to a substantial degree be explained by pH, latitude and proportion of timber volume of deciduous tree species. Furthermore, the majority of species were affected by the studied environmental variables. Therefore, these factors have an important role in the ecological interactions in the forest. All species also showed broad pH-niches with many occurrences spread out within the species entire pH-range. Finally, the study relates to educational science through designing a meaningful excursion for secondary school when teaching ecology.

The SUPERTANK dataset is analyzed to examine the upper limit of beach change in response to elevated water level induced by wave runup. Thirty SUPERTANK runs are investigated, including both erosional and accretionary wave conditions under random and monochromatic waves. Two experiments, one under a spilling and one under a plunging breaker-type, from the Large-Scale Sediment Transport Facility (LSTF) are also analyzed. The upper limit of beach change approximately equals the maximum vertical excursion of swash runup. Exceptions to this direct relationship are those with beach or dune scarps when gravity-driven changes, i.e., avalanching, become significant. The vertical extent of wave runup, Rmax, above mean water level on a beach without a scarp is found to approximately equal the significant breaking wave height, Hbs. Therefore, a simple formula Rmax = Hbs is proposed. The linear relationship between maximum runup and breaking wave height is supported by a conceptual derivation. This predictive formula reproduced the measured runup from a large-scale 3-dimensional movable bed physical model. Beach and dune scarps substantially limit the uprush of swash motion, resulting in a much reduced maximum runup. Predictions of wave runup are not improved by including a slope-dependent surf-similarity parameter. The limit of wave runup is substantially less for monochromatic waves than for random waves, attributed to absence of low-frequency motion for monochromatic waves.

This thesis deals with the aspect of outdoor education of chemistry in the context of the natural science literacy concept. This concept is approximated here in association with the curricula documents for secondary education level and the Contextual model of learning. Based on the description of individual contexts of the aforementioned model, an alternative variant of an excursion to the Prague Waterworks Museum in Podolí is proposed. The practical part focuses on the comparison of the efficiency of the "classic" conception of a museum excursion and the alternative approach mentioned previously. The whole concept adheres to the pedagogical experimental scheme. The comparison is achieved through three testings in two groups. The first, control group, had a standard excursion led by a museum guide. The second, experimental group, had an excursion led in the proposed alternative approach. Based on the first tests - the pretests, the starting knowledge of the pupils is analyzed. The second testing is executed as posttests right after finishing each excursion. The third testing is a retention test one month after the excursion. Test results were analyzed using statistical methods. The results of the analysis point to the considerable importance of the way the excursion is led and to the great benefit of...