57 research outputs found
KI-gesteuerte personalisierte Kundenbindungsprogramme für einen regionalen österreichischen Online-Marktplatz
No full textAuthor Elena Markic, BSc.Abweichender Titel laut Übersetzung der Verfasserin/des VerfassersMasterarbeit Johannes Kepler Universität Linz 2025Arbeit nach Ablauf der Sperre auf den öffentlichen PCs in den Bibliotheken der JKU+Medizin abrufba
Dynamics of equilibration and collisions in ultradilute quantum droplets
No full textEmploying time-dependent density-functional theory, we have studied dynamical equilibration and binary head-on collisions of quantum droplets taking as a case of study droplets made of a K39-K39 Bose mixture. The phase space of collision outcomes is extensively explored by performing fully three-dimensional calculations with effective single-component Quantum Monte Carlo-based and two-component LHY-corrected mean-field functionals. We exhaustively explored the important effect - not considered in previous studies - of the initial population ratio deviating from the optimal mean-field value N2/N1=a11/a22. Both stationary and dynamical calculations indicate sensitivity to an initial nonoptimal concentration. When three-body losses (3BL) are present our two-component approach allows to theoretically address situations in which they mainly act on one of the components of the mixture. Our approach also allows to simultaneously explore the effect on the simulation of population imbalance and 3BL, which are coupled when they act
Dilute quantum liquid in a K-Rb Bose mixture
No full textA quantum liquid in a heterogeneous mixture of and atoms is studied using the diffusion Monte Carlo method and density-functional theory. The perturbative Lee-Huang-Yang term for a heterogeneous mixture is verified and it is proved to be valid only near the gas-liquid transition. Based on the equations of state of the bulk mixture, calculated with diffusion Monte Carlo, extensions to Lee-Huang-Yang corrected mean-field energy functionals are presented. Using density-functional theory, a systematic comparison between different functionals is performed, focusing on the critical atom number, surface tension, surface width, Tolman length, and compressibility. These results are given as a function of the interspecies interaction strength, within the stability domain of the liquid mixture
Sustainable and energy neutral 'European house' in Rwanda
No full textThe importance of energy and sustainability issues related to buildings and built environment is constantly increasing. Developed countries are already dealing with these issues by adjusting their building codes and by introducing sustainability assessment methods as an important part of building projects. But how can developing countries with all its challenges and a focus that is understandingly more pointed towards escaping poverty than thinking about long term sustainability deal with these issues? In this thesis, I assessed the possibilities for an integral design of an energy neutral and sustainable office building in Rwanda, a small country in the heart of Africa and one of the few developing countries that is progressing very fast. I chose to work out the design of a - potentially to be built - office space where the embassies of 6 EU countries could set up office, a project that I named the 'European House'. The main research question of this study is How can a European house in Kigali be optimally designed in an energy neutral and sustainable way? To find answers to this question, the climate of the location, its challenges and opportunities in terms of building design were studied. I also researched locally available construction materials and in general construction materials that could be applied on the project. To get some quantitative values of sustainable issues, a few rating systems were considered. Eventually, I applied the BREEAM International rating system and described how, in this specific context, the European House could score an outstanding rate. Following a literature study, case studies were introduced in order to see what kind of strategies did similar projects use in similar climates (Kenia, Zimbabwe and Malaysia) and what were their achievements regarding sustainability issues. As the European House physically did not exist, some space limitations/dimension requirements needed to be determined by interviewing potential users of the EU House. Representatives of 5 embassies in Kigali filled in my questionnaire, describing their potential spatial requirements, which helped defining the size of building and set further boundaries for the sketch design of the European House. The following conclusions have been drawn based on the proposed sketch design: Use of local/regional building materials Multi-story buildings are almost exclusively made out of concrete in Rwanda, with currently very little focus on sustainability. Recently increased tax rates on cement imported out of east African community will hopefully contribute to the reduction of the embodied energy of the concrete used in Rwanda. With high demand of concrete on one side and its low availability on the other, Rwandan building market will have to search for some appropriate alternatives. When applying timber bearing structure on the European House, the total environmental cost of the bearing structure is 0,21€ per m2 GFA. In this case, the wooden bearing structure offers much less environmental impact than other possible solutions (concrete and steel) and therefore it is the preferred choice. However, timber in Rwandan constructions is still not being used in structural applications, even though it offers great potentials and it is available and possible to be imported from DR Congo – Rwanda’s neighboring country. Passive and active design strategies The following passive strategies proved to be effective in the Kigali climate and could therefor be applied to the European House design: Orientation – long narrowly designed buildings with long side along north/south facade Shading devices – horizontal devices should be installed on northern and southern facades Size of windows: wall/window/ratio should be at least 40%, European House window dimensions should be 1,8x1,8m Natural ventilation: On the proposed design of the European House, the best applicable method is natural side ventilation Active design strategies Focusing on sun and wind local potentials, Energy potential mapping gives encouraging results. Most of the locally available energy could be obtained from the sun, in case all the roof area would be covered by Photovoltaics. In order to assure buildings self-efficiency, it is essential to have an energy storage system/battery, to be able to use the harvested energy in different moments if needed. In the Equator area (which is the case in Rwanda), the solar generation does not change a lot during the year and therefore no large amount of storage is needed. Storage that equals to 3,5 days of average generation should serve as a reasonable backup (this equals to the storage capacity of 1061 kwh in case of Rwanda). In conclusion - with integrating passive and active design strategies on the European House design, 2,5 times more energy is obtained than required. BREEAM International sustainable assessment BREEAM proved to be a very useful tool on the road to sustainable and energy neutral design in the Rwandan context. BREEAM International credits studied in the Rwandan context show that most of them are actually possible to reach, assuming that the project team is experienced in the BREEAM field and that clear goals are set from the very beginning of each project. In theory there are no real obstacles to obtain high credit scores in the Rwanda. However some of the BREEAM International credits would need to be adapted to the local Rwandan context. This regards mostly the credits that are referenced to the local legislations. In conclusion – the example of the European House in Kigali shows that an energy neutral and sustainable office building is possible in Rwanda. Perfect climate conditions and renewable energy potentials are there, to be discovered and used in a smart and responsible way. Rwanda of course misses many things, without which some parts of my analysis would be hard to materialize – like an environmental database for different types of construction materials. Further more, many parts of the BREEAM analysis are assumed to be achieved under good management and financial means which are both hard to find in Rwanda. However, the realization of this or a similar project could inspire a new way to look at possibilities for sustainable and energy neutral buildings in Rwanda. Recommendations for other developing countries · Make a climate study of the location a ‘must’ for any type of construction project in order to reduce the overall energy costs and building performance, even if this is not required by local building regulations · Introducing sustainable assessment methods (BREEAM International) in projects in developing countries encourages the use of passive strategies and influences sustainable outcomes. BREEAM International is a valuable tool to be applied on projects in developing countries. However, when certain datas are not available, one needs to be resourceful · Often the choices of materials applied for structures is related to the fact that local workers only know specific methods and are ‘afraid to build differently’; Rwanda’s recent example shows that local workers can easily be trained to use different building techniques · The benefits and high potentials of sustainable and energy neutral buildings in developing countries need to be better explained and promoted to all parties involved. Suggestions for further research based on this thesis · Further improvement of other widely used construction materials (adobe bricks) and their structural application in multi story buildings in Rwanda · Possibilities of creating a Rwanda National scheme based on BREEAM International Assessment · Challenges of building techniques from vernacular to modern in Rwanda · In case of rising temperatures due to climate change, what kind of consequences would this have on the natural ventilation possibilities in European HouseCivil Engineering and GeosciencesStructural EngineeringBuilding Engineerin
Von Verfügungen über das (Nicht-)Zustandekommen eidgenössischer Referenden und den Tücken bei deren Anfechtung, Bemerkungen zu BGE 146 I 126, Sozialdemokratische Partei Neuenburg et al. gegen «Überparteiliches Komitee gegen immer mehr staatliche Abgaben»
No full textDas kürzlich ergangene Bundesgerichtsurteil BGE 146 I 126 beschäftigt sich mit der Frage der Anfechtbarkeit von Verfügungen der Bundeskanzlei im Zusammenhang mit dem Zustandekommen von eidgenössischen Referenden. Aufgrund einer Gesetzesänderung aus dem Jahre 2007 war es dem Bundesgericht verwehrt, auf die Beschwerde einzutreten. Dieser Kommentar befasst sich nicht nur mit dem Bundesgerichtsurteil, sondern zeigt ebenfalls auf, wie es beinahe unbemerkt zur Rechtsschutzeinschränkung bei den politischen Rechten in eidgenössischen Angelegenheiten kam.
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Le récent arrêt du Tribunal fédéral ATF 146 I 126 traite de la question de savoir si les décisions de la Chancellerie fédérale concernant l\u27aboutissement de référendums fédéraux sont sujets à recours. En raison d\u27une modification législative en 2007, le Tribunal fédéral ne pouvait entrer en matière sur le recours. Ce commentaire traite non seulement de l\u27arrêt du Tribunal fédéral, mais montre également comment, de manière presque inaperçue, la protection juridique des droits politiques a été restreinte au niveau fédéral
Rationality and Emotions in Decision Making
No full textDecision making is traditionally viewed as a rational process where reason calculates the best way to achieve the goal. Investigations from different areas of cognitive science have shown that human decisions and actions are much more influenced by intuition and emotional responses then it was previously thought. In this paper I examine the role of emotion in decision making, particularly Damasio's hypothesis of somatic markers and Green's dual process theory of moral judgment. I conclude the paper with the discussion of the threat that deliberation and conscious rationality is an illusion.philosophy of cognitive science, decision making, emotions, the problem of free will, ethics
Impact of the COVID-19 Pandemic on Diabetic Ketoacidosis Patients Treated in a Pediatric Intensive Care Unit: A Single-Center Cross-Sectional Study
No full textBackground and Objectives: Diabetic ketoacidosis (DKA) is a common complication of type 1 diabetes mellitus (T1DM) in children. Here, we explored the impact of the coronavirus disease 2019 (COVID-19) pandemic on the occurrence and severity of DKA in children in southern Croatia. Materials and Methods: The demographics and clinical and laboratory findings of all children and adolescents aged 0–18 years diagnosed with DKA and admitted to the pediatric intensive care unit (PICU) of the University Hospital of Split, Croatia from January 2013 to May 2023 were retrospectively collected. The participants were divided into two groups: (1) the pre-pandemic group (presenting before mid-March 2020) and (2) the pandemic group (presenting afterwards). Results: A total of 91 patients were included, 68 in the pre-pandemic and 23 in the pandemic group. The admission rate was similar (<1 patient per month) in both groups. In comparison to pre-pandemic patients, which mostly presented during the summer (52.9%) and winter seasons (23.5%), most pandemic cases occurred in spring (34.8%) and fall (30.4%, p = 0.002). No significant differences between the groups were identified in the severity of DKA, as reflected either by mean pH and median bicarbonate levels or by the proportion of patients with severe DKA. Nevertheless, HbA1c and triglycerides were significantly higher in the pandemic group (12.56% vs. 11.02%, p = 0.002 and 4.95 mmol/L vs. 2.8 mmol/L, p = 0.022, respectively) indicating poorer long-term glycemia. DKA complications were, overall, rare and without significant differences between the groups. Conclusions: The COVID-19 pandemic did not impact overall frequency or severity of DKA in children in southern Croatia. While the seasonal changes in DKA occurrence and a poorer long-term glycemia in pandemic patients may have been influenced by COVID-19 outbreaks and the imposed anti-pandemic measures, further studies are needed to determine if this was a temporary pandemic-related phenomenon or if this trend would persist in the future
Quantum Monte Carlo simulation of spin-polarized tritium
No full textThe ground-state properties of spin-polarized tritium T↓ at zero temperature are obtained by means of diffusion Monte Carlo calculations. Using an accurate ab initio T↓-T↓ interatomic potential we have studied its liquid phase, from the spinodal point until densities above its freezing point. The equilibrium density of the liquid is significantly higher and the equilibrium energy of −3.664(6) K significantly lower than in previous approximate descriptions. The solid phase has also been studied for three lattices up to high pressures and we find that hcp lattice is slightly preferred. The liquid-solid phase transition has been determined using the double-tangent Maxwell construction; at zero temperature, bulk tritium freezes at a pressure of P=9(1) bar
Structural, morphological, compositional, and mechanical changes of palatal implants after use: A retrieval analysis
No full textSummary Purpose The aim of this study was to characterize the surface, elemental, and mechanical alterations of orthodontic palatal implants after intraoral aging. Materials and method Nineteen consecutively retrieved implants (RET) after orthodontic treatment and three unused implants used as control (CON) were included in this study. Both groups were characterized non-destructively by Stereomicroscopy, Optical Profilometry (Sa, Sq, Sz, Sc), and SEM/EDX analysis and then destructively after metallogaphic preparation employing instrumented indentation testing (HM, E IT, I • IT, and HV) and SEM/EDX at bone-implant interface. Results All retrieved implants showed a loss of gloss with the formation of bone-like formation on the majority of them. However, no differences in surface roughness parameters were identified between macroscopically intact and retrieved regions of implants. The elements precipitated on the surface were O, C, Ca, and P while traces of Na, K, Al, S, Cl, and Mg were also identified. The surface of control sample is characterized by small pits while only Ti and Al traces were identified by EDX analysis. The presence of all the aforementioned elements apart from Ti and Al on the retrieved implants' surface should be appended to the contact of implant with bone and biological fluids while Interfacial analysis revealed a well-formed bone-implant interface. However, no significant differences were found for all mechanical properties tested between RET and CON groups. Conclusions The results of this study indicate that retrieved palatal implant surface has undergone morphological and elemental alterations probably associated with the osseointegration process during service. Insertion and functional loading did not affect the mechanical properties of implants tested. © The Author 2017. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved. For permissions, please email: [email protected]
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