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See detail0.1 µm T-gate Al-free InP/InGaAs/InP pHEMTs for W-Band Applications Using a Nitrogen Carrier for LP-MOCVD Growth
Schimpf, K.; Sommer, M.; Horstmann, M. et al

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 ... [more ▼]

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. [less ▲]

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See detail0.2µm T-gate InP/InGaAs/InP pHEMT with an InGaP Diffusion Barrier Layer Grown By LP-MOCVD Using an N2-carrier
Schimpf, K.; Hollfelder, M.; Horstmann, M. et al

in Proceedings of the 26th European Solid State Devices Research Conference, Bologna, Italy, 1996 (1996)

Detailed reference viewed: 344 (0 UL)
See detail0.2µm T-gate InP/InGaAs/InP pHEMT with InGaP Diffusion Barrier Layer Grown by LP-MOCVD using an N2-Carrier
Schimpf, K.; Hollfelder, M.; Horstmann, M. et al

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

Detailed reference viewed: 302 (5 UL)
See detail1 Sprooch – 1 Identitéit?
Kmec, Sonja UL

Speeches/Talks (2017)

Detailed reference viewed: 169 (6 UL)
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See detailThe 1-eigenspace for matrices in GL2(ℤℓ)
Lombardo, Davide; Perucca, Antonella UL

in New York Journal of Mathematics (2017)

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See detailDer 1. Mai im Tageblatt
Caregari, Laure UL

Article for general public (2013)

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See detail1.8% de la population vit dans un ménage collectif
Heinz, Andreas UL; Peltier, François; Thill, Germaine et al

E-print/Working paper (2013)

On 1st February 2011, 1.8% of the population of the Grand Duchy were in an institutional household (9073 persons). Among those persons, we find mainly people living in old people’s home (56.1% of ... [more ▼]

On 1st February 2011, 1.8% of the population of the Grand Duchy were in an institutional household (9073 persons). Among those persons, we find mainly people living in old people’s home (56.1% of collective households), then people living in home for adults (10.4%), children living in home for child (5.8%), military living in barracks (5.5%) and those in prison (5.0%). If everyone may need at a time in his life to stay in a collective household, two age’s categories are particularly relevant: the elderly and young adults. [less ▲]

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See detail100 ans de politique pragmatique
Sneessens, Henri UL

Article for general public (2013)

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See detail100 Jaar Prandtl-Wig: De draagkrachtfactoren
Van Baars, Stefan UL

in Geotechniek (2017), December

In 1920 publiseerde Prandtl een artikel over het bezwijken van een materiaal onder een strookbelasting. De bezweken grondmoot is hierbij verdeeld in drie zones, die tezamen de zogenoemde Prandtl-wig ... [more ▼]

In 1920 publiseerde Prandtl een artikel over het bezwijken van een materiaal onder een strookbelasting. De bezweken grondmoot is hierbij verdeeld in drie zones, die tezamen de zogenoemde Prandtl-wig vormen. Prandtl heeft nooit aan de funderingstechnische toepassing gedacht, maar geotechnici vertalen deze oplossing nu als een analytische oplossing voor de draagkracht van de grond onder een strookfundering. Deze oplossing is uitgebreid door Reissner met een bovenbelasting naast de funderingsstrook en door Keverling Buisman en Terzaghi voor het grondgewicht. Terzaghi schreef dit als eerste met drie gescheiden draagkrachtfactoren en Meyerhof als eerste met “inclinatie-” en “shape” factoren, voor de drie afzonderlijke draagkrachtcomponenten; cohesie, bovenbelasting en het grondgewicht. Deze schrijfwijze werd later door Brinch Hansen overgenomen. In dit artikel zijn een groot aantal numerieke berekeningen gemaakt om het bezwijkmechanisme van de Prandtl-wig en de bijbehorende draagkrachtfactoren te controleren. Het blijkt dat het Prandtl-wig bezwijkmechanisme juist is, maar niet in alle gevallen. Ook blijkt dat de analytische oplossingen voor de draagkrachtfactoren die tegenwoordig worden gebruikt, alleen juist zijn voor grond met een onrealistisch hoge dilatantiehoek. [less ▲]

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See detail100 Jahre Intelligenzquotient. Wie der IQ erfunden wurde.
Baudson, Tanja UL

Article for general public (2012)

Detailed reference viewed: 170 (0 UL)
See detail100 Jahre IQ – ein Grund zum Feiern.
Baudson, Tanja UL

Article for general public (2012)

Detailed reference viewed: 162 (0 UL)
See detail100 Joer fräi Gewerkschaften. Contributions à l'histoire du mouvement syndical luxembourgeois
Scuto, Denis UL; Krier, Frédéric; Sauer, Arnaud et al

Book published by Editions Le Phare/OGBL (2016)

Detailed reference viewed: 213 (7 UL)
See detail100 Joer Jeunesse Esch. 1907-2007
Scuto, Denis UL; Hausemer, Georges

Book published by Editions Guy Binsfeld (2007)

Detailed reference viewed: 241 (0 UL)
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See detail100 Year Prandtl’s Wedge - Intermediate report
Van Baars, Stefan UL

Report (2016)

The biggest problem for a shallow foundation, just as 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 ... [more ▼]

The biggest problem for a shallow foundation, just as 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 of 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 year, a lot of extensions have been made, for example with inclination factors and shape factors, and many laboratory experiments have been done and also many 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 made by Ludwig Prandtl in 1920. This intermediuate report “100 Year Prandtl’s wedge” has been made for all those who are interested in these fundamentals of foundation engineering and their history. [less ▲]

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See detail100 Years of Prandtl's Wedge
Van Baars, Stefan UL

Book published by 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 ... [more ▼]

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. [less ▲]

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See detailThe 10th KWMS international conference
Yoo, Hwajong UL

Presentation (2013, June 20)

We discussed level-raising method for residually reducible Galois representations.

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See detail11,8-100% Rural Renewable Energy and Power Supply and its Influence on the Luxembourgish Power System
Norta, David Peter Benjamin UL; Winkler, Christoph; Allelein, Hans-Josef et al

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 ... [more ▼]

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. [less ▲]

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See detail11,8-100% Rural Renewable Energy and Power Supply and its Influence on the Luxembourgish Power System
Norta, David Peter Benjamin UL; Winkler, Christoph; Sachau, Jürgen UL et al

Poster (2015, March 10)

Introduction; 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 ... [more ▼]

Introduction; 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. Methodology; A linear optimisation for the minimum-cost of the power-supply of all villages with the following renewable energy resources: wind- (max.100kW), 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. Results; 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 rural Luxembourgish private households is considered and their power contribution to the system is estimated for different renewable energy supply scenarios, namely from 11,8% 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 amount of applied technologies. Discussion; 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. Conclusion; 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. [less ▲]

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See detail11. Kongress der Fachgruppe Gesundheitspsychologie, Abstractband
Vögele, Claus UL

Book published by University of Luxembourg (2013)

Detailed reference viewed: 340 (6 UL)