Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
See detailExperimental and numerical assessment of the mechanics of keloid-skin composites undergoing large deformations
Sensale, Marco UL; Chambert, Jerome; Chouly, Franz et al

Scientific Conference (2017, August)

Detailed reference viewed: 110 (13 UL)
Full Text
Peer Reviewed
See detailExperimental and Numerical Evaluation of the Residence Time Characteristics on a Forward Acting Grate
Peters, Bernhard UL; Dziugys, A.; Hunsinger, H.

in Condensed Matter 2014 (2014)

Detailed reference viewed: 37 (0 UL)
Full Text
Peer Reviewed
See detailExperimental and numerical evaluation of the transport behaviour of moving bed on a forward acting grate
Peters, Bernhard UL; Dziugys, Algis; Hunsinger, Hans et al

in Granular Matter (2007), 9

Detailed reference viewed: 48 (1 UL)
Full Text
Peer Reviewed
See detailExperimental and numerical investigation into iron ore reduction in packed beds
Peters, Bernhard UL; Hoffmann, F.; Senk, D. et al

in Chemical Engineering Science (2015)

Detailed reference viewed: 97 (1 UL)
Full Text
Peer Reviewed
See detailExperimental and numerical investigation into the residence time distribution of granular particles on forward and reverse acting grate
Samiei, Kasra UL; Peters, Bernhard UL

in Chemical Engineering Science (2013)

Forward andreverseactinggratesarewidelyemployedinwaste-to-energyplants.Inordertopredict the motionofsolidgranularparticlesandoptimisethedesignofsuchsystems,DiscreteElement Method(DEM)isincreasinglyused ... [more ▼]

Forward andreverseactinggratesarewidelyemployedinwaste-to-energyplants.Inordertopredict the motionofsolidgranularparticlesandoptimisethedesignofsuchsystems,DiscreteElement Method(DEM)isincreasinglyused.Theobjectiveofthispaperistopredictthedynamicsofgranular particlesonforwardandreverseactinggratesbyapplyingDEM.Theresidencetimedistributionofsolid particlesisanalysedbyDEMandcomparedwithexperimentalresultsinapilotplantexcluding combustion.TheresultsindicateaverygoodconsistencybetweenDEMandexperimentalresults, highlightingthepromisingcapabilitiesofDEMinpredictingthedynamicsofgranularparticlesingrate systems.CouplingDEMwithcomputationalfluiddynamicstechniquescanfurtheradvancethemethod to accountforthermalconversionofsolidfuelsinfuturework. [less ▲]

Detailed reference viewed: 70 (4 UL)
Full Text
Peer Reviewed
See detailExperimental and numerical investigation into the softening Behavior of a packed bed of iron ore pellets
Baniasadi, Mehdi UL; Peters, Bernhard UL

in Powder Technology (2018), 339

In this contribution, the softening process of a packed bed of pre-reduced pellets is investigated numerically and experimentally. For this purpose, pellets were reduced to different reduction degrees in ... [more ▼]

In this contribution, the softening process of a packed bed of pre-reduced pellets is investigated numerically and experimentally. For this purpose, pellets were reduced to different reduction degrees in a reduction apparatus. The range of reduction degree (RD) was selected 50 − 80%, which is an acceptable range for iron-bearing materials reaching the cohesive zone. Then, softening experiments under load for a packed bed of pre-reduced pellets in a lab-scale furnace at a temperature range of 800oC to initial melt formation point were carried out. For the modeling part, the newly developed eXtended Discrete Element Method (XDEM) is used. This method is able to predict the deformation of particles over temperature which needs an extension to include heat transfer to DEM. Heat transfer between particle-particle, particle-wall, and particle-gas is considered. To validate the XDEM results with the measurements, an appropriate relationship between Young's modulus of the pellet versus temperature has been estimated. The effect of load on the bed shrinkage is also discussed. FactSage version 7.0 software was used to compute the initial melt point with the phase equilibrium for a 5-component FeO − SiO2 − CaO − MgO − Al2O3 system. [less ▲]

Detailed reference viewed: 121 (10 UL)
Full Text
Peer Reviewed
See detailExperimental and Numerical Investigation on Postcracking Behavior of Steel Fiber Reinforced Concrete
Michels, Julien; Christen, Christen; Waldmann, Danièle UL

in Engineering Fracture Mechanics (2012) (2012)

Detailed reference viewed: 127 (9 UL)
Full Text
Peer Reviewed
See detailExperimental approach to the aerodynamic effects produced in multirotors flying close to obstacles
Sanchez Cuevas, Pedro Jesus UL; Heredia, Guillermo; Ollero, Anibal

in Experimental approach to the aerodynamic effects produced in multirotors flying close to obstacles (2017, November 12)

Detailed reference viewed: 17 (0 UL)
Full Text
Peer Reviewed
See detailAn experimental approach to the dynamics of nuclear polarisation
van den Brandt, B.; Glättli, H.; Grillo, I. et al

in Nuclear Instruments & Methods in Physics Research Section A (2004), 526

In the past 3 years a series of experiments have shed new light on the mechanism of dynamic nuclear polarisation (DNP). Time-resolved polarised small-angle neutron scattering and nuclear magnetic ... [more ▼]

In the past 3 years a series of experiments have shed new light on the mechanism of dynamic nuclear polarisation (DNP). Time-resolved polarised small-angle neutron scattering and nuclear magnetic resonance have been used simultaneously to study the nuclear polarisation build-up around paramagnetic centres during DNP. This approach, which aims at visualising the nuclear polarisation process on a microscopic scale, shall be exemplified and the experimental techniques used described in some detail. [less ▲]

Detailed reference viewed: 88 (2 UL)
Full Text
Peer Reviewed
See detailExperimental characterization of the effects of acute stresslike doses of hydrocortisone in human neurogenic hyperlagesia models
Michaux, Gilles; Magerl, Walter; Anton, Fernand UL et al

in Pain (2012), 153(2), 420-428

Detailed reference viewed: 44 (0 UL)
Peer Reviewed
See detailAn experimental comparison of security markets: call-auction vs. double-auction
Neugebauer, Tibor UL

Scientific Conference (2012)

Detailed reference viewed: 71 (0 UL)
Full Text
Peer Reviewed
See detailAn Experimental Comparison of Two Exchange Economies: Long-Lived Asset Versus Short-Lived Asset
Neugebauer, Tibor UL; Carbone, Enrica; D. Hey, John

in Management Science (2021)

Detailed reference viewed: 103 (6 UL)
Full Text
Peer Reviewed
See detailExperimental design trade-offs for gene regulatory network inference: an in silico study of the yeast Saccharomyces cerevisiae cell cycle
Markdahl, Johan UL; Colombo, Nicolo UL; Thunberg, Johan UL et al

in Proceedings of the 56th IEEE Conference on Decision and Control (2017, December)

Time-series of high throughput gene sequencing data intended for gene regulatory network (GRN) inference are often short due to the high costs of sampling cell systems. Moreover, experimentalists lack a ... [more ▼]

Time-series of high throughput gene sequencing data intended for gene regulatory network (GRN) inference are often short due to the high costs of sampling cell systems. Moreover, experimentalists lack a set of quantitative guidelines that prescribe the minimal number of samples required to infer a reliable GRN model. We study the temporal resolution of data vs.quality of GRN inference in order to ultimately overcome this deficit. The evolution of a Markovian jump process model for the Ras/cAMP/PKA pathway of proteins and metabolites in the G1 phase of the Saccharomyces cerevisiae cell cycle is sampled at a number of different rates. For each time-series we infer a linear regression model of the GRN using the LASSO method. The inferred network topology is evaluated in terms of the area under the precision-recall curve (AUPR). By plotting the AUPR against the number of samples, we show that the trade-off has a, roughly speaking, sigmoid shape. An optimal number of samples corresponds to values on the ridge of the sigmoid. [less ▲]

Detailed reference viewed: 132 (10 UL)
Full Text
Peer Reviewed
See detailExperimental Evaluation of a Team of Multiple Unmanned Aerial Vehicles for Cooperative Construction
Real, Fran; Castaño, Angel; Torres-Gonzalez, Arturo et al

in IEEE Access (2021)

This article presents a team of multiple Unmanned Aerial Vehicles (UAVs) to perform cooperative missions for autonomous construction. In particular, the UAVs have to build a wall made of bricks that need ... [more ▼]

This article presents a team of multiple Unmanned Aerial Vehicles (UAVs) to perform cooperative missions for autonomous construction. In particular, the UAVs have to build a wall made of bricks that need to be picked and transported from different locations. First, we propose a novel architecture for multi-robot systems operating in outdoor and unstructured environments, where robustness and reliability play a key role. Then, we describe the design of our aerial platforms and grasping mechanisms to pick, transport and place bricks. The system was particularly developed for the Mohamed Bin Zayed International Robotics Challenge (MBZIRC), where Challenge 2 consisted of building a wall cooperatively with multiple UAVs. However, our approach is more general and extensible to other multi-UAV applications involving physical interaction, like package delivery. We present not only our results in the final stage of MBZIRC, but also our simulations and field experiments throughout the previous months to the competition, where we tuned our system and assessed its performance. [less ▲]

Detailed reference viewed: 33 (2 UL)
Full Text
Peer Reviewed
See detailExperimental Evaluation of a Tool for Change Impact Prediction in Requirements Models: Design, Results, and Lessons Learned
Göknil, Arda UL; van Domburg, Roderick; Kurtev, Ivan et al

in The Fourth International Model-Driven Requirements Engineering (MoDRE) workshop (2014)

There are commercial tools like IBM Rational RequisitePro and DOORS that support semi-automatic change impact analysis for requirements. These tools capture the requirements relations and allow tracing ... [more ▼]

There are commercial tools like IBM Rational RequisitePro and DOORS that support semi-automatic change impact analysis for requirements. These tools capture the requirements relations and allow tracing the paths they form. In most of these tools, relation types do not say anything about the meaning of the relations except the direction. When a change is introduced to a requirement, the requirements engineer analyzes the impact of the change in related requirements. In case semantic information is missing to determine precisely how requirements are related to each other, the requirements engineer generally has to assume the worst case dependencies based on the available syntactic information only. We developed a tool that uses formal semantics of requirements relations to support change impact analysis and prediction in requirements models. The tool TRIC (Tool for Requirements Inferencing and Consistency checking) works on models that explicitly represent requirements and the relations among them with their formal semantics. In this paper we report on the evaluation of how TRIC improves the quality of change impact predictions. A quasi-experiment is systematically designed and executed to empirically validate the impact of TRIC. We conduct the quasi-experiment with 21 master’s degree students predicting change impact for five change scenarios in a real software requirements specification. The participants are assigned with Microsoft Excel, IBM RequisitePro or TRIC to perform change impact prediction for the change scenarios. It is hypothesized that using TRIC would positively impact the quality of change impact predictions. Two formal hypotheses are developed. As a result of the experiment, we are not able to reject the null hypotheses, and thus we are not able to show experimentally the effectiveness of our tool. In the paper we discuss reasons for the failure to reject the null hypotheses in the experiment. [less ▲]

Detailed reference viewed: 120 (4 UL)
Full Text
Peer Reviewed
See detailExperimental Evaluation of Floating Car Data Collection Protocols in Vehicular Networks
Turcanu, Ion UL; Adamsky, Florian; Engel, Thomas UL

in IEEE 90th Vehicular Technology Conference (VTC2019-Fall) (2019)

The main objectives of the Intelligent Transportation Systems (ITS) vision is to improve road safety, traffic management, and mobility by enabling cooperative communication among participants. This vision ... [more ▼]

The main objectives of the Intelligent Transportation Systems (ITS) vision is to improve road safety, traffic management, and mobility by enabling cooperative communication among participants. This vision requires the knowledge of the current state of the road traffic, which can be obtained by collecting Floating Car Data (FCD) information using Dedicated Short-Range Communication (DSRC) based on the IEEE 802.11p standard. Most of the existing FCD collection protocols have been evaluated via simulations and mathematical models, while the real-world implications have not been thoroughly investigated. This paper presents an open-source implementation of two state-of-the-art FCD collection algorithms, namely BASELINE and DISCOVER. These algorithms are implemented in an open-source vehicular prototyping platform and validated in a real-world experimental setup. [less ▲]

Detailed reference viewed: 153 (31 UL)
Full Text
Peer Reviewed
See detailExperimental evaluation of RF waveform designs for Wireless Power Transfer using Software Defined Radio
Gautam, Sumit UL; Kumar, Sumit UL; Chatzinotas, Symeon UL et al

in IEEE Access (2021), 9

The possibility to harvest energy from ambient radio-frequency (RF) sources has intrigued humankind for the past several decades. In this context, there has been a tremendously growing research interest ... [more ▼]

The possibility to harvest energy from ambient radio-frequency (RF) sources has intrigued humankind for the past several decades. In this context, there has been a tremendously growing research interest in the field of wireless power transfer (WPT) using the RF range of the electromagnetic (EM) spectrum. In this paper, we experimentally investigate the aspect of real-time energy harvesting (EH) via different types of waveform designs such as orthogonal frequency division multiplexing (OFDM), square, triangular, sinusoidal, and sawtooth. We make use of a Software Defined Radio (SDR) and a Powercast P21XXCSR-EVB EH module to carry out the experiments on a practical device to assess performance. Specifically, we are interested in obtaining some insights based on the comparison between the aforementioned waveform designs from the perspectives of the separation distance between the USRP and P21XXCSR-EVB EH module, and power emission via USRP. In this vein, we perform additional subsequent experiments after reporting the practical effectiveness of the OFDM waveform, which also follows our intuitive analysis. Correspondingly, we study the effect on WPT with variable USRP transmit power, the separation distance between the USRP and EH antennas, number of OFDM sub-carriers, and multipath setting. As an application of OFDM, the effectiveness of fifth generation-new radio (5G-NR) and long-term evolution (LTE) waveforms are also tested for the WPT mechanism. The demonstration of the EH is provided in terms of the above-mentioned investigation metrics while seeking the best waveform to support WPT. [less ▲]

Detailed reference viewed: 54 (2 UL)
Full Text
Peer Reviewed
See detailExperimental evaluation of RF waveform designs for Wireless Power Transfer using Software Defined Radio
Gautam, Sumit UL; Kumar, Sumit UL; Chatzinotas, Symeon UL et al

in IEEE Access (2021), 9

The possibility to harvest energy from ambient radio-frequency (RF) sources has intrigued humankind for the past several decades. In this context, there has been a tremendously growing research interest ... [more ▼]

The possibility to harvest energy from ambient radio-frequency (RF) sources has intrigued humankind for the past several decades. In this context, there has been a tremendously growing research interest in the field of wireless power transfer (WPT) using the RF range of the electromagnetic (EM) spectrum. In this paper, we experimentally investigate the aspect of real-time energy harvesting (EH) via different types of waveform designs such as orthogonal frequency division multiplexing (OFDM), square, triangular, sinusoidal, and sawtooth. We make use of a Software Defined Radio (SDR) and a Powercast P21XXCSR-EVB EH module to carry out the experiments on a practical device to assess performance. Specifically, we are interested in obtaining some insights based on the comparison between the aforementioned waveform designs from the perspectives of the separation distance between the USRP and P21XXCSR-EVB EH module, and power emission via USRP. In this vein, we perform additional subsequent experiments after reporting the practical effectiveness of the OFDM waveform, which also follows our intuitive analysis. Correspondingly, we study the effect on WPT with variable USRP transmit power, the separation distance between the USRP and EH antennas, number of OFDM sub-carriers, and multipath setting. As an application of OFDM, the effectiveness of fifth generation-new radio (5G-NR) and long-term evolution (LTE) waveforms are also tested for the WPT mechanism. The demonstration of the EH is provided in terms of the above-mentioned investigation metrics while seeking the best waveform to support WPT. [less ▲]

Detailed reference viewed: 54 (2 UL)
See detailExperimental Finance
Neugebauer, Tibor UL

Presentation (2015)

Detailed reference viewed: 49 (0 UL)
Full Text
Peer Reviewed
See detailExperimental identification of a lattice model for woven fabrics: Application to electronic textile
Beex, Lars UL; Verberne, Cyriel; Peerlings, Ron

in Composites. Part A, Applied Science and Manufacturing (2013), 48

Lattice models employing trusses and beams are suitable to investigate the mechanical behavior of woven fabrics. The discrete features of the mesostructures of woven fabrics are naturally incorporated by ... [more ▼]

Lattice models employing trusses and beams are suitable to investigate the mechanical behavior of woven fabrics. The discrete features of the mesostructures of woven fabrics are naturally incorporated by the discrete elements of lattice models. In this paper, a lattice model for woven materials is adopted which consists of a network of trusses in warp and weft direction, which represent the response of the yarns. Additional diagonal trusses are included that provide a resistance against relative rotation of the yarns. The parameters of these families of discrete elements can be separately identified from tensile experiments in three in-plane directions which correspond with the orientations of the discrete elements. The lattice model and the identification approach are applied to electronic textile. This is a fabric in which conductive wires are incorporated to allow the embedment of electronic components such as light-emitting diodes. The model parameters are established based on tensile tests on samples of the electronic textile. A comparison between the experimental results of an out-of-plane punch test and the simulation results shows that the lattice model and its characterization procedure are accurate until extensive biaxial tensile deformation occurs. [less ▲]

Detailed reference viewed: 135 (9 UL)