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See detailLuxembourg born-digital heritages of the COVID-19 crisis, Round Table
Zumthurm, Tizian UL

Scientific Conference (2021, June 16)

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See detailDie religiöse Dimension der Blockchain-Technologie
Becker, Katrin UL

Presentation (2021, June 16)

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See detail#gemeinsamlesen: Raptexte online kommentieren und diskutieren. Unterrichtsmaterialien für den Deutschunterricht
Baumann, Isabell Eva UL

in Programme for Innovative Teaching and Training (PITT) (2021)

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See detailLes représentations du genre dans les manuels scolaires: Une étude à l'école fondamentale luxembourgeoise
Kerger, Sylvie UL; Brasseur, Laurence

Report (2021)

Tous les jours, les enfants se servent des manuels scolaires. Mis à part leur rôle pédagogique, les manuels scolaires agissent comme instruments de socialisation et de transmission de valeurs. De ce fait ... [more ▼]

Tous les jours, les enfants se servent des manuels scolaires. Mis à part leur rôle pédagogique, les manuels scolaires agissent comme instruments de socialisation et de transmission de valeurs. De ce fait, les manuels scolaires ont le potentiel de contribuer à l’égalité entre les sexes dans nos sociétés. Nous présentons un état des lieux ainsi que des pistes possibles pour garantir l'égalité entre les sexes dans les manuels scolaires ainsi que dans les pratiques éducatives. [less ▲]

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See detailEfficient Numerical Methods for Secrecy Capacity of Gaussian MIMO Wiretap Channel
Mukherjee, Anshu; Ottersten, Björn UL; Tran, Le Nam

in 2021 IEEE 93rd Vehicular Technology Conference (VTC2021-Spring) (2021, June 15)

This paper presents two different low-complexity methods for obtaining the secrecy capacity of multiple-input multiple-output (MIMO) wiretap channel subject to a sum power constraint (SPC). The challenges ... [more ▼]

This paper presents two different low-complexity methods for obtaining the secrecy capacity of multiple-input multiple-output (MIMO) wiretap channel subject to a sum power constraint (SPC). The challenges in deriving computationally efficient solutions to the secrecy capacity problem are due to the fact that the secrecy rate is a difference of convex functions (DC) of the transmit covariance matrix, for which its convexity is only known for the degraded case. In the first method, we capitalize on the accelerated DC algorithm, which requires solving a sequence of convex subproblems. In particular, we show that each subproblem indeed admits a water-filling solution. In the second method, based on the equivalent convex-concave reformulation of the secrecy capacity problem, we develop a so-called partial best response algorithm (PBRA). Each iteration of the PBRA is also done in closed form. Simulation results are provided to demonstrate the superior performance of the proposed methods. [less ▲]

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See detailMeasuring the Anisotropy in Interfacial Tension of Nematic Liquid Crystals
Honaker, Lawrence; Sharma, Anjali UL; Schanen, Andy et al

in Crystals (2021), 11(6), 687

<jats:p>Liquid crystal (LC) phases typically show anisotropic alignment-dependent properties, such as viscosity and dielectric permittivity, so it stands to reason that LCs also have anisotropic ... [more ▼]

<jats:p>Liquid crystal (LC) phases typically show anisotropic alignment-dependent properties, such as viscosity and dielectric permittivity, so it stands to reason that LCs also have anisotropic interfacial tensions. Measuring the interfacial tension ? of an LC with conventional methods, such as pendant drops, can be challenging, however, especially when we need to know ? for different LC aligning conditions, as is the case when we seek ??, the interfacial tension anisotropy. Here, we present measurements of ?? of the common synthetic nematic LC compound 5CB against water using a microfluidic droplet aspiration technique. To ensure tangential and normal alignment, respectively, we add poly(vinyl alcohol) (PVA) and sodium dodecylsulfate (SDS), respectively, as a stabilizer and measure ? for different concentrations of stabilizer. By fitting the Szyszkowski equation to the data, we can extrapolate to zero-stabilizer concentration, obtaining the ? of 5CB to pure water for each alignment. For normal alignment, we find ??=31.9?0.8 mN?m-1, on the order of 1 mN?m-1 greater than ?$_$=30.8?5 mN?m-1 for tangential alignment. This resonates with the empirical knowledge that 5CB aligns tangentially to an interface with pure water. The main uncertainty arises from the use of polymeric PVA as tangential-promoting stabilizer. Future improvements in accuracy may be expected if PVA can be replaced by a low molar mass stabilizer that ensures tangential alignment.</jats:p [less ▲]

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See detailMassive MIMO under Double Scattering Channels: Power Minimization and Congestion Controls
Trinh, van Chien UL; Ngo, Quoc Hien; Chatzinotas, Symeon UL et al

in Massive MIMO under Double Scattering Channels: Power Minimization and Congestion Controls (2021, June 14)

This paper considers a massive MIMO system under the double scattering channels. We derive a closed-form expression of the uplink ergodic spectral efficiency (SE) by exploiting the maximum-ratio combining ... [more ▼]

This paper considers a massive MIMO system under the double scattering channels. We derive a closed-form expression of the uplink ergodic spectral efficiency (SE) by exploiting the maximum-ratio combining technique with imperfect channel state information. We then formulate and solve a total uplink data power optimization problem that aims at simultaneously satisfying the required SEs from all the users with limited power resources. We further propose algorithms to cope with the congestion issue appearing when at least one user is served by lower SE than requested. Numerical results illustrate the effectiveness of our proposed power optimization. More importantly, our proposed congestion-handling algorithms can guarantee the required SEs to many users under congestion, even when the SE requirement is high. [less ▲]

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See detailSecure Vehicular Communications Through Reconfigurable Intelligent Surfaces
Ai, Yun; De Figueiredo, Felipe A.P; Kong, Long et al

in IEEE Transactions on Vehicular Technology (2021), 70(7), 7272-7276

Reconfigurable intelligent surfaces (RIS) is considered as a revolutionary technique to improve the wireless system performance by reconfiguring the radio wave propagation environment artificially ... [more ▼]

Reconfigurable intelligent surfaces (RIS) is considered as a revolutionary technique to improve the wireless system performance by reconfiguring the radio wave propagation environment artificially. Motivated by the potential of RIS in vehicular networks, we analyze the secrecy outage performance of RIS-aided vehicular communications in this paper. More specifically, two vehicular communication scenarios are considered, i.e., a vehicular-to-vehicular (V2V) communication where the RIS acts as a relay and a vehicular-to-infrastructure (V2I) scenario where the RIS functions as the receiver. In both scenarios, a passive eavesdropper is present attempting to retrieve the transmitted information. Closed-form expressions for the secrecy outage probability (SOP) are derived and verified. The results demonstrate the potential of improving secrecy with the aid of RIS under both V2V and V2I communications. [less ▲]

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See detailResponsibility for Property and Assets Frozen or Seized by States Upon Request by the International Criminal Court
Owiso, Owiso UL

Scientific Conference (2021, June 10)

Article 57(3)(e) of the Rome Statute of the International Criminal Court empowers the International Criminal Court to ‘seek the cooperation of States pursuant to article 93, paragraph 1 (k), to take ... [more ▼]

Article 57(3)(e) of the Rome Statute of the International Criminal Court empowers the International Criminal Court to ‘seek the cooperation of States pursuant to article 93, paragraph 1 (k), to take protective measures for the purpose of forfeiture, in particular for the ultimate benefit of victims’ while Article 93(1)(k) imposes an obligation on state parties to the statute to provide assistance to the Court in the ‘identification, tracing and freezing or seizure of proceeds, property and assets and instrumentalities of crimes for the purpose of eventual forfeiture’. However, the Court does not yet have sufficient jurisprudence to flesh out the conceptual and practical boundaries of these provisions, including the question of responsibility for the management of the frozen or seized property and assets. If the Court’s very limited relevant jurisprudence is anything to go by, it is urgently necessary to interrogate these provisions and their practical application, as these questions lie at the very core of the Court’s integrity and credibility. This is especially so as the Court seeks to expand its practical reach beyond (mainly indigent) non-state actors to state actors, a situation that is likely to call more attention to the Court’s powers and responsibilities specifically relating to Articles 57(3)(e) and 93(1)(k). This article interrogates the Court’s powers under Article 57(3)(e) and the extent of obligations of the Court and state parties arising from Article 93(1)(k), and the possible implications for the rights of accused persons, the rights and expectations of victims and for state cooperation. [less ▲]

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See detailUniversal statistics of vortices in a newborn holographic superconductor: beyond the Kibble-Zurek mechanism
Del Campo Echevarria, Adolfo UL; Gómez-Ruiz, Fernando Javier; Li, Zhi-Hong et al

in JHEP (2021)

Traversing a continuous phase transition at a finite rate leads to the breakdown of adiabatic dynamics and the formation of topological defects, as predicted by the celebrated Kibble-Zurek mechanism (KZM ... [more ▼]

Traversing a continuous phase transition at a finite rate leads to the breakdown of adiabatic dynamics and the formation of topological defects, as predicted by the celebrated Kibble-Zurek mechanism (KZM). We investigate universal signatures beyond the KZM, by characterizing the distribution of vortices generated in a thermal quench leading to the formation of a holographic superconductor. The full counting statistics of vortices is described by a binomial distribution, in which the mean value is dictated by the KZM and higher-order cumulants share the universal power-law scaling with the quench time. Extreme events associated with large fluctuations no longer exhibit a power-law behavior with the quench time and are characterized by a universal form of the Weibull distribution for different quench rates. [less ▲]

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See detailThe Intra-Party Effects of Open List Design
Schmit, Dan UL

Doctoral thesis (2021)

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See detailElaiophylin Is a Potent Hsp90/ Cdc37 Protein Interface Inhibitor with K-Ras Nanocluster Selectivity
Siddiqui, Farid A.; Vukic, Vladimir; Salminen, Tiina A. et al

in Biomolecules (2021)

The natural product elaiophylin is a macrodiolide with a broad range of biological activities. However, no direct target of elaiophylin in eukaryotes has been described so far, which hinders a systematic ... [more ▼]

The natural product elaiophylin is a macrodiolide with a broad range of biological activities. However, no direct target of elaiophylin in eukaryotes has been described so far, which hinders a systematic explanation of its astonishing activity range. We recently showed that the related conglobatin A, a protein–protein interface inhibitor of the interaction between the N-terminus of Hsp90 and its cochaperone Cdc37, blocks cancer stem cell properties by selectively inhibiting K-Ras4B but not H-Ras. Here, we elaborated that elaiophylin likewise disrupts the Hsp90/ Cdc37 interaction, without affecting the ATP-pocket of Hsp90. Similarly to conglobatin A, elaiophylin decreased expression levels of the Hsp90 client HIF1 , a transcription factor with various downstream targets, including galectin-3. Galectin-3 is a nanocluster scaffold of K-Ras, which explains the K-Ras selectivity of Hsp90 inhibitors. In agreement with this K-Ras targeting and the potent effect on other Hsp90 clients, we observed with elaiophylin treatment a submicromolar IC50 for MDA-MB-231 and MIAPaCa-2 3D spheroid formation. Finally, a strong inhibition of MDA-MB-231 cells grown in the chorioallantoic membrane (CAM) microtumor model was determined. These results suggest that several other macrodiolides may have the Hsp90/ Cdc37 interface as a target site. [less ▲]

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See detailPerformance Enhancement for Full-Duplex Relaying with Time-Switching-Based SWIPT in Wireless Sensors Networks
Tran, Phu Tin; Nguyen Nhat, ; Tran Dinh, Hieu UL et al

in Sensors (2021), 21(11), 3847

Full-duplex (FD) with simultaneous wireless information and power transfer (SWIPT) in wireless ad hoc networks has received increased attention as a technology for improving spectrum and energy efficiency ... [more ▼]

Full-duplex (FD) with simultaneous wireless information and power transfer (SWIPT) in wireless ad hoc networks has received increased attention as a technology for improving spectrum and energy efficiency. This paper studies the outage performance for a SWIPT-based decode-and-forward (DF) FD relaying network consisting of a single-antenna source S, a two-antenna relay R, and a multi-antenna destination D. Specifically, we propose four protocols, namely static time-switching factor with selection combining (STSF-SC), static time-switching factor with maximal ratio combining (STSF-MRC), optimal dynamic time-switching factor with selection combining (ODTSF-SC), and optimal dynamic time-switching factor with maximal ratio combining (ODTSF-MRC) to fully investigate the outage performance of the proposed system. In particular, the optimal time-switching factor from the ODTSF-SC and ODTSF-MRC methods is designed to maximize the total received data at the destination. In this context, we derive exact closed-formed expressions for all schemes in terms of the outage probability (OP). Finally, the Monte Carlo simulations are conducted to corroborate the theoretical analysis’s correctness and the proposed schemes’ effectiveness. [less ▲]

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See detailQuand les e-pétitions influencent-elles la décision politique ? Une analyse du système de pétitions électroniques de la Chambre des députés du Luxembourg
Kies, Raphaël UL; Seidenthal, Sven UL

in Participations (2021), 3(28), 177-202

Dans cet article, nous présentons l’une des premières analyses à étudier de manière systématique les facteurs expliquant le degré d’appropriation par un gouvernement des demandes exprimées dans les e ... [more ▼]

Dans cet article, nous présentons l’une des premières analyses à étudier de manière systématique les facteurs expliquant le degré d’appropriation par un gouvernement des demandes exprimées dans les e-pétitions qui lui sont soumises. Cette analyse se base sur l’ensemble des e-pétitions ayant obtenu les 4 500 signatures requises pour donner lieu à un débat public à la Chambre des députés du Luxembourg. Les hypothèses testées pour expliquer les variations dans le niveau d’appropriation des e-pétitions par le gouvernement ont été : 1) la compatibilité avec l’agenda du gouvernement, 2) la compétence du gouvernement pour traiter les e-pétitions en question, 3) la nature consensuelle (ou non)de l’e-pétition, 4) le nombre de signatures en sa faveur, 5) sa visibilité médiatique, et 6) le statut de son initiateur. Conformément à nos attentes, nous avons observé que les probabilités qu’une e-pétition soit prise en considération par le gouvernement sont liées à essentiellement trois facteurs : 1) la compatibilité avec l’agenda du gouvernement, 2) la compétence du gouvernement et 3) l’accord du gouvernement avec les revendications des pétitionnaires. Les autres facteurs, tels que le soutien populaire ou médiatique de l’e-pétition, sa thématique ou bien les coûts de sa réalisation, apparaissent peu significatifs. [less ▲]

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See detailIntroduction. La participation politique en ligne au révélateur du pétitionnement électronique
Contamin, Jean-Gabriel; Kies, Raphaël UL; Paye, Olivier et al

in Participations (2021), 3(28), 7-45

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See detailDISCOV: Encouraging a Healthy Active Lifestyle through the Design of Interactive Environments.
van Renswouw, Loes; Verhoef, Jasmijn; Vos, Steven et al

Scientific Conference (2021, June)

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