Concept

Reaction engine

Related publications (10)

Equi-Euler GraphNet: An equivariant, temporal-dynamics informed graph neural network for dual force and trajectory prediction in multi-body systems

Accurate real-time modeling of multi-body dynamical systems is essential for enabling digital twin applications across industries. While many data-driven approaches aim to learn system dynamics, jointly predicting internal loads and system trajectories remains a key challenge. This dual prediction is particularly important for fault detection and predictive maintenance in continuously operating systems. Internal loads – such as contact forces – serve as early indicators of faults, reflecting changes due to

2025

A variable stiffness soft gripper with integrated ion-drag pump

One of the major advantages of soft grippers – the fact that they are soft - is also sometimes one of their limitations. While highly compliant materials allow these grippers to conform around and grasp objects, it also limits the amount of force that these actuators can support. Here, we present a compact, prehensile and soft gripper capable of varying its stiffness on demand, allowing not only grasping but also manipulation of objects. The gripper consists of fluidic chambers within a silicone structure a

2022

Performance and Applications of Ionic Electrospray Micro-Propulsion Prototypes

Electric propulsion systems using electrospray ion sources are a scalable and high specific impulse technology which could enable small spacecraft to perform high ΔV missions. This paper presents an overview of a recently developed source design which achieves 10’s of μN of thrust at less than 1 W of input power with a specific impulse up to ∼3000 s. Demonstration devices, fabricated conventionally without microfabrication methods yet with an active area of ∼1 cm2, emit positive and negative ion beams from

2015

Active Model Rocket Stabilization via Cold Gas Thrusters

This paper describes the development and testing of a reaction control system (RCS) for a model rocket named FALCO-4. The rocket uses cold gas jets to keep itself perfectly vertical at low speeds. We first describe the mechanical layout of FALCO-4 and the characteristics of the cold gas propulsion system. We then propose a dynamical model of the rocket and a control scheme based on decoupled PID regulators for roll, pitch and yaw. The control scheme is then evaluated based on MATLAB simulation and flight da

2015

Manipulating motor performance and memory through real-time fMRI neurofeedback

Frank Scharnowski

Task performance depends on ongoing brain activity which can be influenced by attention, arousal, or motivation. However, such modulating factors of cognitive efficiency are unspecific, can be difficult to control, and are not suitable to facilitate neural ...

Elsevier Science Bv2015

Effect of hot spots in microstructured reactors on product distribution during quasi-instantaneous exothermic reactions

John Richard Thome, Albert Renken, Lioubov Kiwi, Thomas Maeder, Navid Borhani

Background. The small characteristic sizes (in the range of 102 - 103 μm) of Microstructured reactors (MSR) lead to very high specific interfacial area which, in turn, increases heat- and mass transfer efficiency. However, for quasi instantaneous exothermic reactions, the overall reaction kinetics in MSR is strongly influenced by mixing. The characteristic time of the latter phenomenon varies from millisecond to seconds depending on the operating conditions used. If mixing is the rate determining step for h

2013

SOLPS modelling of ELMing H-mode

Barbora Bruant Gulejová

Numerical simulation of the tokamak scrape-off layer (SOL) is an essential tool for the prediction of the conditions to be expected in future fusion reactors such as the ITER project, now under construction in Southern France. One particularly important is ...

EPFL2010

Chemical reaction technology

Albert Renken

A comprehensive review. The kinetics of various types of chem. reactions and the influence of transport processes on the effective reaction velocity (macrokinetics) are described. A survey is given on methods to det. the kinetics of reactions. Criteria for the selection and dimensioning of reactors and the choice of reaction conditions are discussed on the basis of reaction kinetics and with respect to efficiency, yield, and thermal safety. The behavior of reactors for single- and multi-phase systems is des

Wiley2004

Modelling of the electron cyclotron current drive experiments in the TCV tokamak

Olivier Sauter, Stefano Coda, Timothy Goodman, Mark Henderson, Roland Behn, Petri Nikkola, Irina Condrea

With the very high electron cyclotron (EC) wave power density achieved in the TCV tokamak, more than 20 MW m(-3), quasilinear modelling predicts an electron cyclotron current drive (ECCD) efficiency well in excess to the experimental value, by up to a factor of 10. Experimentally, radial transport of suprathermal electrons consistent with a diffusion coefficient larger than 1.5 m(2) s(-1) has been observed. This implies that the radial transport time is of the same order as the electron deflection time, sug

IOP Publishing Ltd2003

Nitrobenzene production with simultaneous azeotropic distillation

Albert Renken

A process for nitration of C6H6 [71-43-2] with continuous removal of H2O formed in the process (by azeotropic distn. with C6H6) using the reaction heat was described in which the H2SO4 catalyst thus remained undild. and did not need to be regenerated. Requirements for minimizing HNO3 losses and keeping the HNO3 concn. to a min. in the mixed acid were discussed. [on SciFinder (R)]

1987

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Related publications (10)

Equi-Euler GraphNet: An equivariant, temporal-dynamics informed graph neural network for dual force and trajectory prediction in multi-body systems

2025