Searched for: subject%3A%22Vacuum%22
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Jankovic, T.J. (author), Straathof, Adrie J.J. (author), Kiss, A.A. (author)
Isobutanol is a highly attractive renewable alternative to conventional fossil fuels, with superior fuel properties as compared to ethanol and 1-butanol. Even though the isobutanol production by fermentation has significant potential, complex downstream processing is limiting the wide-spreading of this technology. Accordingly, this original...
journal article 2024
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Yuksel, O. (author), Caglar, Baris (author), Broggi, G.C. (author), Michaud, Véronique (author), Akkerman, Remko (author), Baran, Ismet (author)
The transverse permeability of roving/tow-based fiber reinforcement is of great importance for accurate flow modeling in the pultrusion process. This study proposes an experimental approach to characterize the roving-based fiber beds' permeability under different compaction conditions. The experimental permeability results of thick roving...
journal article 2024
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Seshadri, Bharath (author), Hischier, Illias (author), Masania, K. (author), Schlueter, Arno (author)
A novel approach is presented to 3D print vacuum–tight polymer components using liquid crystal polymers (LCPs). Vacuum–tight components are essential for gas storage and passive heat transfer, but traditional polymer 3D printing methods often suffer from poor interfaces between layers and high free volume, compromising vacuum integrity. By...
journal article 2023
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Yan, J. (author), Zhao, J. (author), Wang, H. (author), Kerklaan, Mels (author), Bannenberg, L.J. (author), Ibrahim, B. (author), Savenije, T.J. (author), Mazzarella, L. (author), Isabella, O. (author)
Multiple-source thermal evaporation is emerging as an excellent technique to obtain perovskite (PVK) materials for solar cell applications due to its solvent-free processing, accurate control of stoichiometric ratio, and potential for scalability. Nevertheless, the currently reported layer-by-layer deposition approach is afflicted by long...
review 2023
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Chan, H.W. (author), Prodanovic, V. (author), Theulings, A.M.M.G. (author), Tao, S. (author), Smedley, J. (author), Hagen, C.W. (author), Sarro, Pasqualina M (author), v.d. Graaf, H. (author)
In this work we demonstrate that ultra-thin (5 and 15 nm) MgO transmission dynodes with sufficient high transmission electron yield (TEY) can be constructed. These transmission dynodes act as electron amplification stages in a novel vacuum electron multiplier: the Timed Photon Counter. The ultra-thin membranes with a diameter of 30 μm are...
journal article 2023
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Kortman, V.G. (author), Sakes, A. (author), Endo, Gen (author), Breedveld, P. (author)
Gripping slippery and flexible tissues during minimal invasive surgery (MIS) is often challenging using a conventional tissue gripper. A force grip has to compensate for the low friction coefficient between the gripper’s jaws and the tissue surface. This study focuses on the development of a suction gripper. This device applies a pressure...
journal article 2023
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Haschenburger, A.I. (author)
Composites are increasingly used in the aerospace industry due to their lightweight potential and flexible design options. The most widespread manufacturing process for large components made of fibre composites is still the open mould process. In this process, a composite component is placed on a mould and hermetically sealed with a vacuum bag...
doctoral thesis 2022
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van Linden, N. (author)
Ammonia (NH3) is one of world’s most-produced chemicals and is mostly used as a raw resource for fertilisers. From the used NH3-based fertilisers, almost half of the NH3 ends up in receiving water bodies, leading to eutrophication, eventually resulting in species diversity loss in the aquatic environment. To minimise environmental damage, total...
doctoral thesis 2022
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Theulings, A.M.M.G. (author), Tao, S. X. (author), Hagen, C.W. (author), van der Graaf, H. (author)
The effect of doping in Si3N4 membranes on the secondary electron yield is investigated using Monte Carlo simulations of the electron-matter interactions. The effect of the concentration and the distribution of the doping in silicon rich silicon nitride membranes is studied by using the energy loss function as obtained from ab initio density...
journal article 2022
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Haschenburger, A.I. (author), Onorato, L. (author), Sujahudeen, M. S. (author), Taraczky, D. S. (author), Osis, A. (author), Bracke, A. R.S. (author), Byelov, M. D. (author), Vermeulen, F. I. (author), Oosthoek, E. H.Q. (author)
The localisation of leakages during the vacuum bagging process of a composite is currently time intensive and reliant on human labour. The purpose of this article is to explore four computational methods for leakage localisation using volumetric flow rate (VFR) data to increase the automation of the process. The data used in this article is...
journal article 2022
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Dong, J. (author), Becetti, Belkassem (author), Bauer, P. (author)
This paper investigates a high speed vacuum tube train system relying on wheels for suspension and a multi-mode linear electric machine for charging and propulsion: the machine will be configured as a doubly fed induction machine for charging at stationary, and as a permanent magnet synchronous machine for acceleration and deceleration. The...
conference paper 2022
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Chan, H.W. (author), Prodanovic, V. (author), Theulings, A.M.M.G. (author), ten Bruggencate, T. (author), Hagen, C.W. (author), Sarro, Pasqualina M (author), van der Graaf, H. (author)
Large-area transmission dynodes were fabricated by depositing an ultra-thin continuous film on a silicon wafer with a 3-dimensional pattern. After removing the silicon, a corrugated membrane with enhanced mechanical properties was formed. Mechanical metamaterials, such as this corrugated membrane, are engineered to improve its strength and...
journal article 2022
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Villalba, Víctor (author), van Es, Johannes (author), Kuiper, J.M. (author), Gill, E.K.A. (author)
Piezoelectric actuators are a very attractive technology for active optics mechanisms in space applications due to their very high precision and reliability. However, self-heating of these actuators may be limit their use in space or under high loads, due to the limited ability to evacuate heat. Test procedures that reproduce the operational...
journal article 2022
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Chen, Jing (author), Liu, X. (author), Zeng, Xiao Liang (author), Ye, Huai Yu (author), Zhang, Kouchi (author)
Hexagonal boron nitride (BN) is often used as filler to improve the thermal conductivity of polymer matrix due to its high thermal conductivity. However, previously reported BN-based composites always have a high in-plane thermal conductivity, which is not beneficial for vertical heat dissipation. In addition, high BN content results in the...
journal article 2022
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van Linden, N. (author), Spanjers, H. (author), van Lier, J.B. (author)
Gaseous ammonia (NH3) recovered from residual waters may be used as a fuel in solid oxide fuel cells (SOFCs) to generate electricity without emission of undesirable oxidised nitrogen species. NH3 can be directly recovered from water as a gas by vacuum membrane stripping (VMS), which also results in the evaporation of water (H2O), leading to the...
journal article 2022
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Chan, H.W. (author), Prodanovic, V. (author), Theulings, A.M.M.G. (author), Hagen, C.W. (author), Sarro, Pasqualina M (author), v.d. Graaf, H. (author)
The (secondary) electron emission from multilayered Al2O3/TiN membranes has been investigated with a hemispherical collector system in a scanning electron microscope for electrons with energies between 0.3 and 10 keV. These ultra-thin membranes are designed to function as transmission dynodes in novel vacuum electron multipliers. Two...
journal article 2021
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De Fazio, F. (author), Bakker, C.A. (author), Flipsen, Bas (author), Balkenende, R. (author)
Designers and engineers need better tools and methods to create highly repairable products. Design for disassembly and reassembly is an important product related design feature that can enhance repair. In a highly repairable product, the components that fail most often should be easily accessible for repair or replacement. This paper...
journal article 2021
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Mo, J. (author), Middelburg, L.M. (author), Morana, B. (author), van Zeijl, H.W. (author), Vollebregt, S. (author), Zhang, Kouchi (author)
The application of pressure sensors in harsh environments is typically hindered by the stability of the material over long periods of time. This work focuses on the design and fabrication of surface micromachined Pirani gauges which are designed to be compatible with state-of-the-art Silicon Carbide CMOS technology. Such an integrated...
journal article 2021
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Struzziero, G. (author), Teuwen, Julie J.E. (author)
The paper tackles the multi-objective optimisation of the cure stage of the Vacuum Assisted Resin Transfer Moulding (VARTM) process to manufacture the root insert of wind turbine blades. The aim of the study is to compare the Pareto front obtained from a pure heat transfer analysis, where temperature overshoot is an objective, with the one...
journal article 2020
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Ghasemi, Sajjad (author), Allahbakhshi, Mehdi (author), Behdani, B. (author), Tajdinian, Mohsen (author), Popov, M. (author)
Vacuum circuit breaker operation causes transient overvoltages that may lead to severe damages to transformer insulation. Since the parameters affecting these overvoltages have stochastic nature, a statistical analysis may provide detailed insight into the overvoltages from the point of view of insulation coordination applications. In this paper...
journal article 2020
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