24 research outputs found
Q13a Amstel Field Development
No full textThe Amstel oil field is located in block Q13a in the Dutch southern North Sea about 13 km off the coast of Scheveningen. The oil is trapped in an Early Cretaceous reservoir which is informally named Amstel Sandstone. At present, the production license of the field is held by Gaz de France Suez, TAQA Energy has a 10% share. The Amstel field is divided into four blocks (north, east, south and the central + west block, which are connected in the present study). The south, central and north block of the Amstel field are pop-up structures and are heavily faulted internally, thereby sub-seismic faults are likely to exist. The east block is more like an anticline containing few faults. The seismic top reservoir surface and faults are provided by the previous operator and are quality checked, matched to well markers and modified for modeling purposes. The structure of the Amstel field was found to be too complex for Petrel which is why Jewelsuite is used which allows the exact representation of the Amstel structure. The Amstel Member is interpreted to represent a barrier bar complex including barrier bars, tidal inlet channels, a back-barrier lagoon and washovers. The facies and property modeling is performed in Petrel (on a model without structure) and consequently imported into Jewelsuite. Using the truncated Gaussian simulation method, belt models are created for each zone in the Amstel field. The transgressive character of the sequence is modeled with marine distal facies belts to the north northwest and coastal proximal facies belts to the south southeast. Multiple belt models are created and merged to mimic the different transitions between the belts. The belts are filled with facies found in each belt individually and tidal channels are superimposed. Facies and zone dependent porosity distributions are used to populate the model. Net-to-gross and saturations are modeled subsequently. Facies dependent porosity-permeability relationships are proposed and are used in the models. Three static models of the Amstel field are constructed based on the extent in facies belts and the amount of reservoir facies in the back-barrier lagoon. Only one structural model of the field is used and no variation in petrophysical relationships is used. The base case model resulted in a STOIIP of 20.01 MMSTB. The volumes show a reduction of about 20% compared to the previous study which can mainly be ascribed to the difference in structures. Probabilistic STOIIP calculations result in a P90-P10 range of 17.6-24.5 MMSTB. Multiple development scenarios are simulated on the dynamic model. Recovery factors after 7 years range from 35 to 44%, where the lowest recovery is obtained by primary depletion and the highest recovery by the application of artificial lift, a horizontal well and water injection. Because the Amstel oil is light and considerable aquifer support from the flanks is expected, the reservoir reaches high recovery by primary depletion. The application of water injection, a horizontal well and down-hole selectivity is simulated and is considered unviable. NPV and DPI ranking show that minimalistic development scenarios are most viable where the separation and processing of reservoir fluids is done on the P15 facilities. A sensitivity study shows that the low and high case properties are most sensitive to the recovery.Section Petroleum EngineeringCivil Engineering and Geoscience
A decision support tool to assess maintenance policies for electronics in Dutch movable bridges; From a Circular Economy Perspective
No full textMechanical, Maritime and Materials EngineeringMechanical EngineeringTransportation Engineering & Logistic
Author Correction: In-plane selective area InSb–Al nanowire quantum networks (Communications Physics, (2020), 3, 1, (59), 10.1038/s42005-020-0324-4)
No full textThe Data availability statement of this article has been modified to add the accession link to the raw data. The old Data availability statement read “Materials and data that support the findings of this research are available within the paper. All data are available from the corresponding author upon request”. This has been replaced by “Materials and data that support the findings of this research are available within the paper. The raw data have been deposited at https://zenodo.org/record/4589484#.YEoEOy1Y7Sd”. This has been corrected in both the HTML and PDF version of the article.Correction include: The Data availability statement of this article has been modified to add the accession link to the raw data.QRD/Kouwenhoven LabQRD/Goswami LabBUS/Quantum DelftQN/Kouwenhoven LabElectronic Components, Technology and Material
Crossed Andreev reflection in InSb flake Josephson junctions
No full textWe study superconducting quantum interference in InSb flake Josephson junctions. An even-odd effect in the amplitude and periodicity of the superconducting quantum interference pattern is found. Interestingly, the occurrence of this pattern coincides with enhanced conduction at both edges of the flake, as is deduced from measuring a superconducting quantum interference device (SQUID) pattern at reduced gate voltages. We identify the specific crystal facet of the edge with enhanced conduction, and confirm this by measuring multiple devices. Furthermore, we argue the even-odd effect is due to crossed Andreev reflection, a process where a Cooper pair splits up over the two edges and recombines at the opposite contact. An entirely h/e periodic SQUID pattern, as well as the observation of both even-odd and odd-even effects, corroborates this conclusion. Crossed Andreev reflection could be harnessed for creating a topological state of matter or performing experiments on the nonlocal spin entanglement of spatially separated Cooper pairs
In-plane selective area InSb–Al nanowire quantum networks
No full textStrong spin–orbit semiconductor nanowires coupled to a superconductor are predicted to host Majorana zero modes. Exchange (braiding) operations of Majorana modes form the logical gates of a topological quantum computer and require a network of nanowires. Here, we utilize an in-plane selective area growth technique for InSb–Al semiconductor–superconductor nanowire networks. Transport channels, free from extended defects, in InSb nanowire networks are realized on insulating, but heavily mismatched InP (111)B substrates by full relaxation of the lattice mismatch at the nanowire/substrate interface and nucleation of a complete network from a single nucleation site by optimizing the surface diffusion length of the adatoms. Essential quantum transport phenomena for topological quantum computing are demonstrated in these structures including phase-coherence lengths exceeding several micrometers with Aharonov–Bohm oscillations up to five harmonics and a hard superconducting gap accompanied by 2e-periodic Coulomb oscillations with an Al-based Cooper pair island integrated in the nanowire network.QRD/Kouwenhoven LabQRD/Goswami LabBUS/Quantum DelftQN/Kouwenhoven La
Postoperative pain assessment should not be solely based on numeric ratings
No full textColleague van Dijk wrote an interesting article about the perception of pain scores, based on the relationship between two questionnaires and the results on these questionnaires of patients and caregivers (van Dijk et al., 2011). It is a nice article with a good description of the questionnaires and their background, the methodology and the results. The study shows that a group of caregivers have a slightly different score. No more and no less. Nothing is said about the actual treatment. In conclusion the author states that a potential risk of overtreatment may arise as decisions for treatment are solely based on NRS scores. The interpretation of the results is what we would like to discuss. The article seems to evoke some negative reactions in the Netherlands about the position of the acute pain nurse
The Dynamical State of the Didymos System before and after the DART Impact
Get PDFNASA's Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, the natural satellite of (65803) Didymos, on 2022 September 26, as a first successful test of kinetic impactor technology for deflecting a potentially hazardous object in space. The experiment resulted in a small change to the dynamical state of the Didymos system consistent with expectations and Level 1 mission requirements. In the preencounter paper, predictions were put forward regarding the pre- and postimpact dynamical state of the Didymos system. Here we assess these predictions, update preliminary findings published after the impact, report on new findings related to dynamics, and provide implications for ESA's Hera mission to Didymos, scheduled for launch in 2024 October with arrival in 2026 December. Preencounter predictions tested to date are largely in line with observations, despite the unexpected, flattened appearance of Didymos compared to the radar model and the apparent preimpact oblate shape of Dimorphos (with implications for the origin of the system that remain under investigation). New findings include that Dimorphos likely became prolate due to the impact and may have entered a tumbling rotation state. A possible detection of a postimpact transient secular decrease in the binary orbital period suggests possible dynamical coupling with persistent ejecta. Timescales for damping of any tumbling and clearing of any debris are uncertain. The largest uncertainty in the momentum transfer enhancement factor of the DART impact remains the mass of Dimorphos, which will be resolved by the Hera mission.The work presented here was supported in part by the DART mission, NASA Contract #80MSFC20D0004 to JHU/APL. Part of this work was supported by the Programme National de Planétologie (PNP) of CNRS-INSU cofunded by CNES, by CNES itself, and by the BQR program of the Observatoire de la Côte d'Azur. The ACROSS project is supported under the OSIP ESA CONTRACT No. 4000135299/21/NL/GLC/ov. This study makes use of data obtained by the Observing Working Group of the DART Investigation Team. Some simulations were performed on the ASTRA cluster administered by the Center for Theory and Computation, part of the Department of Astronomy at the University of Maryland. H.F.A. was supported by the French government, through the UCA J.E.D.I. Investments in the Future project managed by the National Research Agency (ANR) with the reference number ANR-15-IDEX-01. R.H.C. acknowledges that this material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under grant No. DGE 2040434. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. F.F. acknowledges funding from the European Research Council (ERC) under the European Union's Horizon Europe research and innovation program (grant agreement No. 101077758). R.M. acknowledges that this work was supported by a NASA Space Technology Graduate Research Opportunities (NSTGRO) award, NASA contract No. 80NSSC22K1173. P.M. acknowledges support from the French space agency CNES and ESA. R.N. acknowledges support from NASA/FINESST (NNH20ZDA001N). Y.Z. acknowledges the support provided by NASA through grant HST-GO-17292 from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, under NASA contract NAS 5-26555. A.C.B., E.G., M.J., P.M., R.L.M., S.D.R., P.T., K.T., and M.Z. acknowledge funding support from the European Union's Horizon 2020 research and innovation program under grant agreement No. 870377 (project NEO-MAPP). The work of S.R.C, E.G.F, and S.P.N was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (#80NM0018D0004). E.G., R.L.M., M.Z., and P.T. wish to acknowledge Caltech and the NASA Jet Propulsion Laboratory for granting the University of Bologna a license to an executable version of MONTE Project Edition S/W. E.G., R.L.M., A.R., M.Z., and P.T. are grateful to the Italian Space Agency (ASI) for financial support through Agreement No. 2022-8-HH.0 in the context of ESA's Hera mission. M.J. and S.D.R. acknowledge support by the Swiss National Science Foundation (project number 200021 207359). J.M. acknowledges support from the DART Participating Scientist Program (#80NSSC21K1048). F.M. acknowledges financial support from grants PID2021123370OB-I00 and CEX2021-001131-S funded by MCIN/AEI/10.13039/501100011033. N.M. acknowledges funding support from the European Commission's Horizon 2020 research and innovation program under grant agreement No. 870377 (NEO-MAPP project) and support from the Centre National d'Etudes Spatiales (CNES), focused on the Hera space mission. L.P. was supported by an appointment to the NASA Postdoctoral Program at the NASA Jet Propulsion Laboratory, California Institute of Technology, administered by Oak Ridge Associated Universities under contract with NASA. P.P. and P.S. acknowledge support by the Grant Agency of the Czech Republic, grant 23-04946S. S.R.S. acknowledges support from the DART Participating Scientist Program, grant no. 80NSSC22K0318. D.S. acknowledges support of the France-USA Fulbright Commission while a Fulbright Visiting Scholar (2022–2023) at UC Berkeley and thanks Action Fédératrice Gaia of the Paris Observatory for financial support. G.T. acknowledges financial support from project FCE-1-2019-1-156451 of the Agencia Nacional de Investigación e Innovación ANII and Grupos I+D 2022 CSIC-Udelar (Uruguay). P.T., A.R., and M.Z. acknowledge financial support from Agenzia Spaziale Italiana (ASI, contract No. 2019-31-HH.0 CUP F84I190012600). J.M.T.-R. acknowledges support from the Spanish project PID2021-128062NB-I00 funded by MCIN/AEI
Ontwerp Gofiner
No full textDocument(en) uit de collectie Chemische Procestechnologie.DelftChemTechApplied Science
Electric field tunable superconductor-semiconductor coupling in Majorana nanowires
No full textWe study the effect of external electric fields on superconductor-semiconductor coupling by measuring the electron transport in InSb semiconductor nanowires coupled to an epitaxially grown Al superconductor. We find that the gate voltage induced electric fields can greatly modify the coupling strength, which has consequences for the proximity induced superconducting gap, effective g-factor, and spin-orbit coupling, which all play a key role in understanding Majorana physics. We further show that level repulsion due to spin-orbit coupling in a finite size system can lead to seemingly stable zero bias conductance peaks, which mimic the behavior of Majorana zero modes. Our results improve the understanding of realistic Majorana nanowire systems.QRD/Kouwenhoven LabApplied SciencesQN/Bakkers La
Transmission phase read-out of a large quantum dot in a nanowire interferometer
No full textDetecting the transmission phase of a quantum dot via interferometry can reveal the symmetry of the orbitals and details of electron transport. Crucially, interferometry will enable the read-out of topological qubits based on one-dimensional nanowires. However, measuring the transmission phase of a quantum dot in a nanowire has not yet been established. Here, we exploit recent breakthroughs in the growth of one-dimensional networks and demonstrate interferometric read-out in a nanowire-based architecture. In our two-path interferometer, we define a quantum dot in one branch and use the other path as a reference arm. We observe Fano resonances stemming from the interference between electrons that travel through the reference arm and undergo resonant tunnelling in the quantum dot. Between consecutive Fano peaks, the transmission phase exhibits phase lapses that are affected by the presence of multiple trajectories in the interferometer. These results provide critical insights for the design of future topological qubits.QRD/Kouwenhoven LabQN/Kouwenhoven La
