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See detailWhy is the Market Skewness-Return Relationship Negative?
Lehnert, Thorsten UL

Scientific Conference (2020, January 23)

Detailed reference viewed: 46 (6 UL)
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See detailWHY IS THE MARKET SKEWNESS-RETURN RELATIONSHIP NEGATIVE?
Lehnert, Thorsten UL

E-print/Working paper (2019)

Detailed reference viewed: 92 (3 UL)
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See detailWhy medication or tobacco consumption enhance the life satisfaction of cardiovascular patients?
Bucki, Barbara UL; Tchicaya, Anastase; Baumann, Michèle UL

in European Health Psychologist (2015), special

While life satisfaction (LS) promotes the health of cardiovascular patients, LS may be affected by a range of primary and secondary determinants. We analysed LS and its relationships with cardiovascular ... [more ▼]

While life satisfaction (LS) promotes the health of cardiovascular patients, LS may be affected by a range of primary and secondary determinants. We analysed LS and its relationships with cardiovascular risk factors and unhealthy behaviours. Methods. In 2013, 3,632 survivors who underwent coronary angiography in 2008-2009 at the Luxembourgish National Institute of Cardiac Surgery and Cardiological Intervention (INCCI), living at home were asked to estimate, five years after, their LS [1-10] and other health-related variables. Data were analysed via multiple regression models including interaction effects. Findings. LS of the 1,289 participants (age: 69.2±11.1) was 7.3/10. Most were men, employees or manual workers, had secondary education and a 36,000€ or more/year income. The interactions between hypercholesterolemia and hypertension (regression coefficient= 0.628) and with smoking (rc= 0.941) were positively related with LS, but physical inactivity was negatively associated (rc= -0.630). Discussion. Taking medications or maintaining tobacco consumption produces better LS than being ambivalent towards physical activity. Further research is needed to evaluate the efficacy of health interventions eliciting and promoting the behaviour change wheel based on capabilities, opportunities, and motivations. [less ▲]

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See detailWhy organically functionalized nanoparticles increase the electrical conductivity of nematic liquid crystal dispersions
Urbanski, Martin; Lagerwall, Jan UL

in Journal of Materials Chemistry C (2017), 5(34), 8802-8809

Doping liquid crystals with gold nanoparticles increases the conductivity by up to three orders of magnitude, an increase even stronger than expected for equimolar amounts of organic electrolytes. Despite ... [more ▼]

Doping liquid crystals with gold nanoparticles increases the conductivity by up to three orders of magnitude, an increase even stronger than expected for equimolar amounts of organic electrolytes. Despite recent high activity in the field of liquid crystalline nanocomposites, the origin of this increase has rarely been addressed and is not well understood. In this dielectric spectroscopy study we discuss the origin of the increased conductivity and identify its source. We demonstrate that the hydrodynamic radius of the mobile charge carrier species in nanoparticle dispersions is significantly smaller than the 3–5 nm gold core, which rules out the particles themselves to be the source of conductivity. Likewise, also the ligand molecules from the organic capping layer do not themselves add to the conductivity of the dispersions, but affect the electrical properties by acting as a trap for ionic impurities. We suggest that the partial release of these impurities upon interactions of the ligand shell with the uniaxial nematic host phase is the most likely source for the increased conductivity. Our study opens a new perspective on synthesis strategies for functionalized nanoparticles and will help to overcome the current issues preventing high-performing liquid crystal nanodispersions. [less ▲]

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See detailWhy serve soup with a fork?: How policy coherence for development can link environmental impact assessment with the 2030 agenda for sustainable development
Koff, Harlan UL

in Environmental Impact Assessment Review (2021), 86

The Sustainable Development Goals (SDGs) re-focused development cooperation on universal and transformative development aimed at improving the quality of life of people in all world regions, while ... [more ▼]

The Sustainable Development Goals (SDGs) re-focused development cooperation on universal and transformative development aimed at improving the quality of life of people in all world regions, while simultaneously conserving natural resources. Critics, however, have correctly questioned whether appropriate policy methods and tools exist for the adequate implementation of transformative development. These challenges are even more significant given that the implementation of the SDGs falls to nation-states. This article asks “Can the transformative development promoted by the SDG’s be achieved through the policy tools presently utilized by nation-states, such as environmental impact assessment (EIA)?” The study responds to this question through a critical examination of EIA in Mexico in relation to mining. Empirical analysis focuses on the proposed Caballo Blanco open-pit mine in Veracruz state. The case can be considered critical because it is often presented as a success, given that a broad coalition of actors prevented the mine from opening through activities directed at EIA. This article questions this narrative because it shows how EIA actually can undermine transformative development through the use of cost-benefit logics. The article concludes that policy coherence for development (PCD) can potentially support EIA as a methodology through which transformative development can be promoted. PCD can improve the “normative effectiveness” of EIA when used as an evaluation criteria. Otherwise, EIA may undermine the implementation of the SDGs which would be comparable to serving soup with a fork. [less ▲]

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See detailWhy serve soup with a fork?: How policy coherence for development can link environmental impact assessment with the 2030 agenda for sustainable development
Koff, Harlan UL

in Environmental Impact Assessment Review (2021), 86

The Sustainable Development Goals (SDGs) re-focused development cooperation on universal and transformative development aimed at improving the quality of life of people in all world regions, while ... [more ▼]

The Sustainable Development Goals (SDGs) re-focused development cooperation on universal and transformative development aimed at improving the quality of life of people in all world regions, while simultaneously conserving natural resources. Critics, however, have correctly questioned whether appropriate policy methods and tools exist for the adequate implementation of transformative development. These challenges are even more significant given that the implementation of the SDGs falls to nation-states. This article asks “Can the transformative development promoted by the SDG’s be achieved through the policy tools presently utilized by nation-states, such as environmental impact assessment (EIA)?” The study responds to this question through a critical examination of EIA in Mexico in relation to mining. Empirical analysis focuses on the proposed Caballo Blanco open-pit mine in Veracruz state. The case can be considered critical because it is often presented as a success, given that a broad coalition of actors prevented the mine from opening through activities directed at EIA. This article questions this narrative because it shows how EIA actually can undermine transformative development through the use of cost-benefit logics. The article concludes that policy coherence for development (PCD) can potentially support EIA as a methodology through which transformative development can be promoted. PCD can improve the “normative effectiveness” of EIA when used as an evaluation criteria. Otherwise, EIA may undermine the implementation of the SDGs which would be comparable to serving soup with a fork. [less ▲]

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See detailWhy Should Judges Be independent? Reflections on Coke, Montesquieu and the French Tradition of Judicial Dependence
Heuschling, Luc UL

in Baranger, Denis; Ziegler, Katja; Bradley, Anthony W. (Eds.) Constitutionalism and the Role of Parliaments (2007)

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See detailWhy so few, and why so late? Green parties and the question of governmental participation
Dumont, Patrick UL; Bäck, Hanna

in European Journal of Political Research (2006), 45

Green parties have been represented in the parliaments of European Union countries since 1981, but it was not until recently that a few have entered national governments. Using a data set comprised of 51 ... [more ▼]

Green parties have been represented in the parliaments of European Union countries since 1981, but it was not until recently that a few have entered national governments. Using a data set comprised of 51 government formation opportunities (where the Greens were represented in parliament), the authors of this article show that the parties involved in these bargaining situations are more office-oriented than earlier studies had found. As Green parties are seen to be less office-seeking than other parties, this general tendency for office-seeking behaviour in government formation may partly account for the scarcity of Greens in government. Furthermore, a number of hypotheses derived from theories that account for the specific nature of Green parties in terms of their office-, policy- and vote-seeking orientations are tested. It is found that Greens participate in government when they have lost votes in at least one election, when the main party of the left identifies them as a clear electoral threat and when the policy distance between the Greens and either the formateur party or the main left party is small (the latter condition must be accompanied by a substantial proportion of seats for the Green party in parliament). As most of these simultaneous conditions only materialized recently, and in a few countries, it is argued that this analysis, which is the first comparative and multivariate test focused on this question, explains the scarcity and the delay of Green governmental participation. [less ▲]

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See detailWhy social studies of childhood? An introduction to the handbook
Honig, Michael-Sebastian UL; Qvortrup, Jens; Corsaro, William A.

in Qvortrup, Jens; Corsaro, William A.; Honig, Michael-Sebastian (Eds.) The Palgrave Handbook of Childhood Studies (2009)

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See detailWhy Students Procrastinate: A Qualitative Approach
Klingsieck, Katrin B.; Grund, Axel UL; Schmid, Sebastian et al

in Journal of College Student Development (2013), 54(4), 397-412

In this study we adopted an impartial view on academic procrastination in order to gain new insights for the development of intervention programs. Following a qualitative approach, we thereby explored ... [more ▼]

In this study we adopted an impartial view on academic procrastination in order to gain new insights for the development of intervention programs. Following a qualitative approach, we thereby explored antecedents of procrastination by attending to the actual voices and experiences of 29 students. Students' subjective theories were in line with some antecedents that previous research had addressed (lack of motivation or volitional control), but also revealed relatively new aspects of academic procrastination that concern students' social relatedness and task competence. Considering these findings, we suggest ideas on how to assist students and how to design intervention programs. [less ▲]

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See detailWhy we do not care for statelessness as we care for asylum?
Sommarribas, Adolfo UL

Presentation (2019, July 07)

This presentation address the issue why statelessness is so marginalised in the migration discourse in the European Union even though is a growing phenomenon.

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See detailWhy ‘what works’ still won’t work. From evidence-based education to value-based education.
Biesta, Gert UL

in Studies in Philosophy & Education (2010), 29(5), 491-503

Detailed reference viewed: 300 (1 UL)
See detail„Why“ is the answer not the question: The role of perceived responsibility and control for emotional adaptation in cancer patient
Hoffmann, Martine UL; Lessing, J.; Ferring, Dieter UL

in Annual Conference of the Canadian Association of Psychosocial Oncology. Vancouver, Canada (2009)

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See detailWi-Fi butterfly effect in indoor localization: The impact of imprecise ground truth and small-scale fading
Popleteev, Andrei UL

in 14th IEEE Workshop on Positioning, Navigation and Communications (WPNC-2017) (2017, October)

The increasing accuracy of indoor positioning systems makes their evaluation an increasingly challenging task. A number of factors are already known to affect performance of fingerprint-based systems ... [more ▼]

The increasing accuracy of indoor positioning systems makes their evaluation an increasingly challenging task. A number of factors are already known to affect performance of fingerprint-based systems: hardware diversity, device orientation, environment dynamics. This paper presents a new butterfly-like effect in localization experiments. The effect is caused by minor ground truth (GT) errors --- that is, small deviations between calibration and test positions. While such deviations are widely considered as purely additive and thus negligible, we demonstrate that even centimeter-scale GT errors are amplified by small-scale radio fading and lead to severe multi-meter Wi-Fi positioning errors. The results show that fingerprint-based localization accuracy quickly deteriorates as GT errors increase towards 0.4 wavelength (5 cm for 2.4 GHz). Beyond that threshold, system's accuracy saturates to about one-third of its original level achievable with precise GT. This effect challenges the impact of the already known accuracy-limiting factors (such as cross-user tests, receiver diversity, device orientation and temporal variations), as they can be partially explained by minor GT errors. Moreover, for smartphone-in-a-hand experiments, this effect directly associates the evaluation outcomes with experimenters' diligence. [less ▲]

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See detailWideband Identification of Power Network Parameters Using Pseudo-Random Binary Sequences on Power Inverters
Neshvad, Surena UL; Chatzinotas, Symeon UL; Sachau, Jürgen UL

in IEEE Transactions on Smart Grid (2015)

Due to the push for renewable energy in the last decades, European countries have witnessed an exponential growth of Distributed Generation (DG) on the Medium Voltage (MV) network. An increasingly large ... [more ▼]

Due to the push for renewable energy in the last decades, European countries have witnessed an exponential growth of Distributed Generation (DG) on the Medium Voltage (MV) network. An increasingly large portion of the electricity demand is fed in through the distribution grid, whose good health and operational status will be important for guaranteeing grid stability. In Luxembourg, the distribution network is sparsely monitored and controlled, thus instabilities arising due to line overvoltage or DG malfunctioning are not rapidly detected and resolved. This research discusses a novel and low infrastructure methodology for online monitoring of the distribution grid. Such a tool will be increasingly necessary in order to guarantee the stability, reliability and security of the power network, as a larger and larger portion of the energy demand will be satisfied by DG in future years. In this research, advanced system identification techniques utilized in communications, such as Pseudo-Random Binary Sequences, Successive Interference Cancellation are applied to estimate the transfer function of power network propagation paths. The developed method proposes an online monitoring tool that computes grid parameters in real time during operation, without extensive infrastructure addition, by utilizing the PWM based inverters on the grid for active system identification. [less ▲]

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See detailWideband OFDM-based Communications in Bus Topology as a Key Enabler for Industry 4.0 Networks
Gonzalez Rios, Jorge Luis UL; Torres Gómez, Jorge; Sharma, Rajesh Kumar et al

in IEEE Access (2021), 9

The Industry 4.0 paradigm conceives a cyber-physical supporting framework for the manufacturing processes in smart factories. In this context, solutions concerning the wired communications at the field ... [more ▼]

The Industry 4.0 paradigm conceives a cyber-physical supporting framework for the manufacturing processes in smart factories. In this context, solutions concerning the wired communications at the field-level have been reported which utilize either fieldbuses, which exhibit a huge distance range but a reduced data rate in a bus topology, or Ethernet-based technologies, which provide an increased data rate but reduced distance in a ring topology. To overcome this shortage, we propose the use of orthogonal frequency division multiplexing (OFDM) to significantly increase the achievable data rates over large distances in industrial bus systems. Also, we establish a novel methodology to compute the signal-to-noise ratio between arbitrary pairs of nodes, which in turn allows to compute the communication capacity. Our wideband system was validated by connecting up to 32 nodes in the distance range 100 m–1 km. Compared to fieldbuses, the results of the proposal exhibit an amazing improvement in data rate of about fifty times for 100m distance and more than ten times for 0.5 km. Moreover, with respect to Ethernet-based solutions, the results show a relevant improvement in the data rate of around five times for 100 m distance, but Ethernet-based systems cannot go beyond this distance, to which our proposal is not limited. [less ▲]

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See detailWidely-distributed Radar Imaging Based on Consensus ADMM
Hu, Ruizhi UL; Rao, Bhavani Shankar Mysore Rama; Murtada, Ahmed et al

E-print/Working paper (2020)

Detailed reference viewed: 38 (15 UL)
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See detailWider das Lernen. Die Wiedergewinnung einer Sprache für Erziehung im Zeitalter des Lernens.
Biesta, Gert UL

in Vierteljahresschrift für wissenschaftliche Pädagogik (2008), 84(2), 179-194

Detailed reference viewed: 247 (1 UL)