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See detailStandardising smart contracts: Automatically inferring ERC standards
Norvill, Robert UL; Fiz Pontiveros, Beltran UL; State, Radu UL et al

in 2019 IEEE International Conference on Blockchain and Cryptocurrency (2019)

Ethereum smart contracts have become common enough to warrant the need for standards to ensure ease of use. The most well known standard was created for the emerging token ecosystem and the exchanges ... [more ▼]

Ethereum smart contracts have become common enough to warrant the need for standards to ensure ease of use. The most well known standard was created for the emerging token ecosystem and the exchanges serving it: the ERC20 standard. In this work we use the function selectors present in Ethereum smart contract bytecode to define contract purpose. Contracts are clustered according to the selectors they have. A Reverse look-up from selectors to function names is used to label clusters. We use the function names in clusters to suggest candidates for ERC standardisation. [less ▲]

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See detailTax Transparency in Luxembourg
Pantazatou, Aikaterini UL; Chaouche, Fatima UL

in Başaran Yavaşlar, Funda; Hey, Johanna (Eds.) Tax Transparency (2019)

Detailed reference viewed: 41 (2 UL)
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See detailA conditional access system with revocation for mobile pay-TV systems revisited
Rial Duran, Alfredo UL

in Information Processing Letters (2019), 147

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See detailA DEM approach for modeling biomass fast pyrolysis in a double auger reactor
Qi, Fenglei UL

Scientific Conference (2019, July)

Thermochemical conversion of biomass via fast pyrolysis process is a promising way to produce renewable fuels and chemicals. In this paper, an extended discrete element method (DEM) is developed to ... [more ▼]

Thermochemical conversion of biomass via fast pyrolysis process is a promising way to produce renewable fuels and chemicals. In this paper, an extended discrete element method (DEM) is developed to predict the biomass fast pyrolysis process in a double auger reactor, which is described as a reacting granular flow. The thermodynamic state of each particle is properly predicted with an addition of a heat transfer model and a reaction model on top of the traditional DEM method. The results suggest that the predictions of the thermochemical decomposition kinetics of biomass components are consistent with the experimental observations. The results also indicate that the fast pyrolysis in the reactor is controlled by the heat transfer process. Any operating condition variation in favor of enhancing heat transfer is beneficial to the fast pyrolysis process and vice versa. [less ▲]

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See detailBody mass index and social interactions from adolescence to adulthood
Joxhe, Majlinda UL; Corrado, Luisa; Distante, Roberta

in Spatial Economic Analysis (2019)

A dynamic linear-in-means model is applied in order to analyse the importance of social ties for the body weight-related behaviour of US youth. The methodology shows how to estimate peer effects free of ... [more ▼]

A dynamic linear-in-means model is applied in order to analyse the importance of social ties for the body weight-related behaviour of US youth. The methodology shows how to estimate peer effects free of the ‘reflection problem’ in a dynamic context where individual and group-specific unobservable effects are controlled for. The results show that the main drivers for the body weight-related behaviour are past and peer effects. For individuals who were normal weight or obese during adolescence, past and peer effects are shown to be both relevant. Peer effects, instead, explain more the variation in the body mass index (BMI) for individuals who were overweight during adolescence, showing in this way the importance of social interactions for body weight-related behaviour. [less ▲]

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See detailOnlinehandel, Logistik und Verkehr
Flämig, Heike; Hesse, Markus UL

in RaumPlanung (2019), 202(3-4/2019), 30-35

The paper explores the implications that result from rising online shopping and the related patterns of distribution in European cities. The particular consequences of new modes of logistics distribution ... [more ▼]

The paper explores the implications that result from rising online shopping and the related patterns of distribution in European cities. The particular consequences of new modes of logistics distribution for cities and for urban planning are being discussed. While the paper is cautious against the assumption of an exploding freight transport resulting from online-shopping behaviour (it yet seems to be moderate so far), the paper calls for a more comprehensive awareness for the overall imprint of logistics changes in urban regions. Respective concepts for urban and transport planning are needed, in order to make cities and their distribution patterns more sustainable. [less ▲]

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See detailMetropolisierung oder die Zweite Häutung der Stadt
Hesse, Markus UL

Article for general public (2019)

Der Begriff der Metropole kennzeichnet üblicher Weise große Städte, die durch die Kombination von hoher Bevölkerungszahl, wirtschaftlicher Stärke und kultureller Ausstrahlung geprägt sind. Parallel dazu ... [more ▼]

Der Begriff der Metropole kennzeichnet üblicher Weise große Städte, die durch die Kombination von hoher Bevölkerungszahl, wirtschaftlicher Stärke und kultureller Ausstrahlung geprägt sind. Parallel dazu werden in jüngster Zeit auch kleinere Standorte beachtet, die relativ rasch gewachsen sind. Als Erklärungsansatz dient hier der Prozess der „Metropolisierung“. Luxemburg ist idealtypisch dafür. [less ▲]

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See detailUne histoire contemporaine du Luxembourg en 70 chroniques
Scuto, Denis UL

Book published by Fondation Robert Krieps/Luxembourg Centre for Contemporary and Digital History (C2DH) avec l'appui de la Fondation Lydie Schmit (2019)

"A contemporary history of Luxembourg in 70 chronicles" by Denis Scuto is a collection of 70 press chronicles, published from 2014 to 2019 in the Luxembourg newspaper Tageblatt. It is "public history" in ... [more ▼]

"A contemporary history of Luxembourg in 70 chronicles" by Denis Scuto is a collection of 70 press chronicles, published from 2014 to 2019 in the Luxembourg newspaper Tageblatt. It is "public history" in the best sense of the word, because Denis Scuto as a professional historian intervenes directly in today's debates and enlightens them in a dazzling way by replacing them in the history of Luxembourg and Europe. It is a book aimed directly at the general public, which does not necessarily read scholarly works, but is interested in understanding the country in which it lives and works, with its indissolubly linked past and present. It is therefore a contemporary history because, over the course of the current debates commented by Denis Scuto, the essential elements of the construction of contemporary Luxembourg appear: the birth of the Grand Duchy as a nation-state, its hard learning of independence throughout the nineteenth century, political and social struggles, the consequences of the two world wars, its destiny as a country made of migratory flows, the upheaval of a rural country that became an industrial power and then a European and financial centre, etc. [less ▲]

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See detailLaser polishing of Aluminum and Polyamide for dissimilar laser welded assemblies
Amne Elahi, Mahdi UL; Koch, Marcus; Plapper, Peter UL

Scientific Conference (2019, June 27)

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See detailLaser overlap joining from copper to aluminum and analysis of failure zone
Mathivanan, Karthik UL; Plapper, Peter UL

Scientific Conference (2019, June 26)

Joining of copper and aluminum sheets are very crucial for battery application. When joining from copper sheet, keyhole mode of welding is essential to overcome the reflectivity and melting threshold of ... [more ▼]

Joining of copper and aluminum sheets are very crucial for battery application. When joining from copper sheet, keyhole mode of welding is essential to overcome the reflectivity and melting threshold of copper. However, in dissimilar material interaction the resulting intermetallic (IMC) phases are brittle, which result in reduced performance.This paper analyses the joint with laser beam irradiated from the copper side (Cu on top). The idea is to distribute the intermetallic compounds inside the joint to obtain a ductile behavior. The zones of failure and the distribution of the intermetallic phase is studied. The microstructural analysis of the fusion zone and mechanical strength of the joint are presented. [less ▲]

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See detailInvestor Schemes "Golden Passports" and "Golden Visas"
Sommarribas, Adolfo UL

Report (2019)

For the last 10 years, the EU Member States have been developing schemes to attract wealthy third-country national investors. To this end, Member States have facilitated the granting of visas or residence ... [more ▼]

For the last 10 years, the EU Member States have been developing schemes to attract wealthy third-country national investors. To this end, Member States have facilitated the granting of visas or residence permits and even implemented fast-track procedures for the acquisition of citizenship. The Commission’s report identified the following areas of concern: 1) Security: checks run on applicants are not sufficiently robust and the EU’s own centralised information systems, such as the Schengen Information System (SIS), are not being used as systematically as they should be; 2) Money laundering: enhanced checks (‘due diligence’) are necessary to ensure that rules on anti-money laundering are not circumvented; 3) Tax evasion: monitoring and reporting is necessary to make sure that individuals do not take advantage of these schemes to benefit from privileged tax rules; 4) Transparency and information: the report finds a lack of clear information on how the schemes are run, including on the number of applications received, granted or rejected and the origins of the applicants; and 5) In addition, Member States do not (routinely) exchange information on applicants for such schemes, nor do they inform each other of rejected applicants. [less ▲]

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See detailCross-Cultural Psychogerontology
Albert, Isabelle UL; Tesch-Römer, Clemens

in Gu, Danan; Dupre, Matthew E. (Eds.) Encyclopedia of Gerontology and Population Aging (2019)

Population aging is a phenomenon that affects most parts of the world. According to recent data from the World Population Prospects (United Nations 2017), the number of older persons – those aged 60+ – ... [more ▼]

Population aging is a phenomenon that affects most parts of the world. According to recent data from the World Population Prospects (United Nations 2017), the number of older persons – those aged 60+ – has reached 962 million worldwide and is expected to climb to 2.1 billion in 2050. In spite of these general world trends, life expectancies differ still largely, and aging remains a highly diverse experience across the world. While universal developmental tasks are markers for older age in all societies (e.g., becoming a grandparent), expectations with regard to typical life trajectories and the timing of transitions vary. This “social clock” (Neugarten et al. 1965) or “cultural chrononormativity of aging” (Brinkmann and Musaeus 2018) is also expressed in legal regulations and policies (e.g., availability and timing of retirement schemes). Normative and nonnormative life events and their interpretation as on time or off-time might thus be defined very differently depending on the cultural (and historical) context (see also Baltes et al. 1980; Wrosch and Heckhausen 2005). This leads to one of the central questions of cross-cultural aging research: Are aging processes universals across cultures and societies in the Western, Eastern, Northern, and Southern parts of the world – or do aging processes differ between cultures and societies? [less ▲]

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See detailHigh Performance Parallel Coupling of OpenFOAM+XDEM
Besseron, Xavier UL; Pozzetti, Gabriele; Rousset, Alban UL et al

Presentation (2019, June 21)

Detailed reference viewed: 53 (5 UL)
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See detailAutomated optimisation of stem cell-derived neuronal cell culture in three dimensional microfluidic device
Kane, Khalid Ibnou Walid UL

Doctoral thesis (2019)

This dissertation is a compilation of publications and manuscripts that aim 1) to integrate an automated platform optimised for long term in vitro cell culture maintenance for Parkinson’s disease, long ... [more ▼]

This dissertation is a compilation of publications and manuscripts that aim 1) to integrate an automated platform optimised for long term in vitro cell culture maintenance for Parkinson’s disease, long term live cell imaging and the handling of many cell lines, 2) to combine physics principles with imaging techniques to optimise the seeding of Matrigel embedded human neuroepithelial stem cells into a three-dimensional microfluidic device, and 3) to combine engineering principles with cell biology to optimise the design of a three-dimensional microfluidic system based on phaseguide technology. In the first publication manuscript, we investigated Matrigel as a surrogate extracellular matrix in three-dimensional cell culture systems, including microfluidic cell culture. The study aimed at understanding and characterising the properties of Matrigel. Using classical rheological measurements of Matrigel (viscosity versus shear rate) in combination with fluorescence microscopy and fluorescent beads for particle image velocimetry measurements (velocity profiles), the shear rates experienced by cells in a microfluidic device for three-dimensional cell culture was characterised. We discussed how the result of which helped to mechanically optimise the use of Matrigel in microfluidic systems to minimise the shear stress experienced by cells during seeding in a microchannel. The second manuscript proposes a methodology to passively control the flow of media in a three-dimensional microfluidic channel. We used the fluid dynamic concept of similitude to dynamically replicate cerebral blood flow in a rectangular cross-sectional microchannel. This similarity model of a target cell type and a simple fluid flow mathematical prediction model was used to iterate the most optimum dimensions within some manufacturing constraints to adapt the design of the OrganoPlate, a cell culture plate fully compatible with laboratory automation, which allowed its re-dimension to achieve over 24h of flow for the culture of human neuroepithelial stem cells into midbrain specific dopaminergic neurons. In the third publication manuscript, we propose an automated cell culture platform optimised for long-term maintenance and monitoring of different cells in three-dimensional microfluidic cell culture devices. The system uses Standard in Laboratory Automation or SiLA, an open source standardisation which allows rapid software integration of laboratory automation hardware. The automation platform can be flexibly adapted to various experimental protocols and features time-lapse imaging microscopy for quality control and electrophysiology monitoring to assess cellular activity. It was biologically validated by differentiating Parkinson’s disease patient derived human neuroepithelial stem cells into midbrain specific dopaminergic neurons. This system is the first example of an automated Organ-on-a-Chip culture and has the potential to enable a versatile array of in vitro experiments for patient-specific disease modelling. Finally, the fourth manuscript initiates the assessment of the neuronal activity of induced pluripotent stem cell derived neurons from Parkinson’s Disease patients with LRRK2-G2019S mutations and isogenic controls. A novel image analysis pipeline that combined semi-automated neuronal segmentation and quantification of calcium transient properties was developed and used to analyse neuronal firing activity. It was found that LRRK2-G2019S mutants have shortened inter-spike intervals and an increased rate of spontaneous calcium transient induction than control cell lines. [less ▲]

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See detail"Are you a boy or girl?" Who are the non-responders
Heinz, Andreas UL; Catunda, Carolina UL; van Duin, Claire UL et al

Scientific Conference (2019, June 20)

Background: In many studies, participants who do not state their gender are excluded from the analysis. This may be appropriate if they do not answer the questionnaire seriously. However, some ... [more ▼]

Background: In many studies, participants who do not state their gender are excluded from the analysis. This may be appropriate if they do not answer the questionnaire seriously. However, some participants may have understandable reasons for not reporting their gender, e.g. questioning their gender identity. Objective: How many students and which students do not answer the question on gender? Methods: HBSC 2018 raw data from Ireland, Luxembourg, Belgium and France are compared. To explore the reasons for non-response, we divided the participants into 3 groups: 1. Responders answered both sociodemographic questions (age and gender) 2. age non-responders did not answer the question on age. 3. Gender non-responders answered the question on age, but not the one on gender. Results: Between 0.8% (Ireland) and 1.2% (Luxembourg) of participants did not report their gender. About half of them did not answer the age question either. However, the other half belong to the group of gender non-responders and this group is disadvantaged compared to responders: they report lower life satisfaction, lower self-rated health, more health complaints, less peer support and their WHO-5 Well-being score is lower. Not answering the question on gender is rare. If the participants answered the question on age, but not the question on gender, then the variable gender is missing not at random. Implication: The question arises whether the group of gender non-responders should be included in the analysis and whether the question on gender should be asked differently in the future. [less ▲]

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See detail„What’s a normal weight?“ – Weight assessment standards in Origin- and Receiving Country and Immigrant Adolescents’ Weight-Status Self-Assessment
Kern, Matthias Robert UL; Heinz, Andreas UL; Stevens, Gonneke et al

Scientific Conference (2019, June 19)

Background: Many young people struggle with correctly assessing their weight-status, often leaving over- or underweight to go unnoticed thereby preventing adequate intervention. The prevalence of weight ... [more ▼]

Background: Many young people struggle with correctly assessing their weight-status, often leaving over- or underweight to go unnoticed thereby preventing adequate intervention. The prevalence of weight-status misperception differs considerably cross-nationally, indicating that individual weight-status assessment is informed by culturally transmitted standards of evaluation. For adolescents with a migration background, this brings up the problem of multiple frames of reference, as their perception of weight-status may be influenced by different cultural standards. Objective: We investigate the extent to which the assessment of one's own weight-status is based on standards of the heritage country or the receiving country. Methods: Data are retrieved from the 2014 Health Behaviour in School-Aged Children study. The cross-national design of the study enabled us to aggregate weight-evaluation standards for 41 countries and subsequently identify a large sample of 8132 immigrant adolescents in 23 receiving countries from 41 heritage countries. The influence of heritage- and receiving country standards of evaluation was assessed using cross-classified multilevel models. Results: Descriptive analyses reveal considerable differences in weight-evaluation standards between the countries. We find evidence of a significant influence of both heritage- and receiving culture standards of evaluation, with a stronger impact of receiving culture standards. Stratified analyses reveal a stronger influence of heritage culture standards among first- than among second-generation immigrants, and a stronger influence of receiving culture standards among second- than among first-generation immigrants. Conclusions: The results corroborate our expectations regarding the persistency of cultural standards and help to understand inter-ethnic differences in weight-status assessment. [less ▲]

Detailed reference viewed: 30 (3 UL)