0.1 µm T-gate Al-free InP/InGaAs/InP pHEMTs for W-Band Applications Using a Nitrogen Carrier for LP-MOCVD Growth

in IEEE Electron Device Letters (1997), 18

We report on the dc and RF performance of HEMT’s based on the Al-free material system InP/InGaAs/InP. These structures were grown by LP-MOCVD using a nitrogen carrier. The influence of gate length and ... [plus ▼]

We report on the dc and RF performance of HEMT’s based on the Al-free material system InP/InGaAs/InP. These structures were grown by LP-MOCVD using a nitrogen carrier. The influence of gate length and channel composition on the performance of these devices is investigated.We demonstrate that optimum dc and RF performance using highly strained channels can be obtained only if additional composite channels are grown. The cutoff frequencies fT =160 GHz and fmax=260 GHz for a 0.1- um T-gate device indicate the suitability of our devices for W-Band applications. [moins ▲]

0.2µm T-gate InP/InGaAs/InP pHEMT with InGaP Diffusion Barrier Layer Grown by LP-MOCVD using an N2-Carrier

in Proceedings of the 8th International Conference on InP and Related Compounds, Schwäbisch Gmünd, Germany (1996)

The 1-eigenspace for matrices in GL2(ℤℓ)

in New York Journal of Mathematics (2017)

1.8% de la population vit dans un ménage collectif

E-print/Working paper (2013)

Au 1er février 2011, 1.8% de la population du Grand-Duché habitait dans des ménages collectifs (soit 9 073 personnes). Parmi ces personnes, on trouve en premier lieu les personnes vivant en maison de ... [plus ▼]

Au 1er février 2011, 1.8% de la population du Grand-Duché habitait dans des ménages collectifs (soit 9 073 personnes). Parmi ces personnes, on trouve en premier lieu les personnes vivant en maison de retraite (56.1% de l’ensemble des personnes vivant en ménage collectif), les personnes vivant dans les foyers pour adultes (10.4%), les enfants habitant dans un foyer (5.8%), les militaires vivant en caserne (5.5%) et les personnes en prison (5.0%). Si tout le monde peut être amené, à un moment de sa vie, à séjourner dans un ménage collectif, deux catégories d’âge sont particulièrement concernées : les personnes âgées et les jeunes adultes. De façon globale, la population vivant dans des ménages collectifs est un peu plus féminine que masculine, mais de fortes disparités existent selon le type d’institution. Par exemple, les femmes sont très majoritaires dans les maisons de retraite, tandis que les hommes sont majoritaires dans les foyers pour adultes et en prison. En ce qui concerne les nationalités, les Luxembourgeois sont plus représentés dans les maisons de retraite (90.7% de nationaux) que dans les foyers pour adultes (55.1% d’étrangers). Un peu plus de la moitié des communes accueille des personnes vivant en ménage collectif. Cette disparité s’explique par le fait que la grande majorité de ces personnes vivent dans des maisons de retraite et que ces dernières ne sont présentes que dans certaines communes. [moins ▲]

100 ans de politique pragmatique

Article grand public (2013)

100 Jahre Intelligenzquotient. Wie der IQ erfunden wurde.

Article grand public (2012)

100 Joer fräi Gewerkschaften (1916-2016): contributions à l'histoire du mouvement syndical luxembourgeois

Ouvrage publié par Le Phare (2016)

100 Joer Jeunesse Esch. 1907-2007

Ouvrage publié par Editions Guy Binsfeld (2007)

100 Years of Prandtl's Wedge

Ouvrage publié par IOS Press (2018)

The biggest problem for a shallow foundation, just as for any other type of foundation, is a failure due to an overestimation of the bearing capacity. This means that the correct prediction of the bearing ... [plus ▼]

The biggest problem for a shallow foundation, just as for any other type of foundation, is a failure due to an overestimation of the bearing capacity. This means that the correct prediction of the bearing capacity of the foundation is often the most important part of the design of a civil structure. That is why the publication by Prandtl in 1920 about the hardness of a plastic body, was a major step in solving the bearing capacity of shallow foundations, although it is well possible that he never realised this, because his solution was not made for civil engineering purposes, but for mechanical purposes. Over the last 100 years, a lot of extensions have been made, for example with inclination factors and shape factors. Also many laboratory experiments have been done and numerical calculations have been made. Some even try to extrapolate the failure mechanism for shallow foundations to the failure mechanism around the tip of a pile. All this scientific work leads back to the first publication by Ludwig Prandtl in 1920. This book, “100 Years of Prandtl’s Wedge”, is intended for all those who are interested in these fundamentals of foundation engineering and their history. The Appendices include a copy of Prandtl’s Über die Härte plastischer Körper and of Reissner’s publication of 1924, Zum Erddruckproblem. [moins ▲]

11,8-100% Rural Renewable Energy and Power Supply and its Influence on the Luxembourgish Power System

in Energy Procedia (2015), 73

Currently, the majority of countries tries to reduce their dependency on fossil fuels by the introduction of renewable resources in their energy systems. In the following the relatively small ... [plus ▼]

Currently, the majority of countries tries to reduce their dependency on fossil fuels by the introduction of renewable resources in their energy systems. In the following the relatively small Luxembourgish electricity system is analysed (0.55 Mio Inhabitants). Current power-system-models mainly focus on larger systems, due to the unavailability of specific consumption-data. Prices and effects on the Luxembourgish power system of different supply scenarios for rural-private households are analysed. A linear optimisation for the minimum-cost of the power-supply of a village with the following renewable energy resources: wind- (max.100 kW), solar-PV- and hydrokinetic-power is made. The electricity-demand scales with the number of inhabitants and agricultural-consumers. The wind-power-potential differs with the location of the village. The solar-radiation is assumed to be the equal over the country, due to the small size of approximately 80 by 50 km. The hydrokinetic turbines complete the supply where a village is located close to a river. The minimum cost of the specific village power-supply is the result of the optimization. The installation- and maintenance-cost of each renewable technology are considered. The whole number of a rural Luxembourgish model villages private households is considered and their electricity contribution to the system is estimated for different renewable energy supply scenarios, namely from 20% to 100% renewable-energy-scenarios. For each scenario the power exchanged from the village to the grid is calculated in 15-min-steps for 9-years, the amount differs widely with the number of applied generation technologies. Due to the high share of imported electricity of about 80% in the recent years, every consideration of national power generation does not harm the supply security. Luxembourg is a good model country to analyse the high share of distributed, renewable generators, due to its structure of rural and civic regions and their effects on a central European region with a high electricity-consumption. [moins ▲]