90 research outputs found
Nederland op een kantelpunt: Interview met Floris Alkemade over zijn periode 2015-2021 als rijksbouwmeester
No full textDe architect en stedenbouwer Floris Alkemade begon september 2015 en beëindigt september 2021 als rijksbouwmeester zijn termijn. Het was een turbulente periode die begon met de naweeën van de financiële crisis van 2008-2014 met ver doorgevoerde bezuinigingen door het rijk en een winterslaap voor de bouwsector en eindigde met Covid-19 crisis, astronomische woningnood en belofte om groen te investeren. Een periode die ook samenviel met de neoliberale kabinetten Rutte en decentralisatie van rijksbeleid naar gemeenten. Samen met het College van Rijkadviseurs gaf Alkemade gevraagd en ongevraagd advies over architectuur en ruimtelijke ontwikkeling in Nederland. Nog veel meer dan zijn voorgangers stelde hij maatschappelijke thema’s aan de orde. Het woningvraagstuk, energietransitie, klimaatadaptatie, mobiliteitstransitie, zorgtransitie, migratie, landbouwtransitie werden in samenhang gebracht en verbeeld. Op 20 januari sprak het team van 1M Homes initiative van de TU Delft met de rijksbouwmeester
De apostel van de verdichtingskerk rijksbouwmeester Floris Alkemade en de weilandvolbouwer en woningbouwhoogleraar Peter Boelhouwer in debat over de woningopgave: Wonen in een waarde(n)volle samenleving
No full textEén miljoen woningen er nu bijbouwen? Twee maatschappelijk betrokken personen, rijksbouwmeester en architect Floris Alkemade en onderzoeker en woningmarkthoogleraar Peter Boelhouwer, gaven beiden een keynotelezing en troffen elkaar in een debat onder leiding van hoogleraar Housing Institutions & Governance Marja Elsinga op de TU Delft. Het debat was onderdeel van een ochtend ter voorbereiding op een onderzoeksvoorstel in het kader van de Nationale Wetenschapsagenda (NWA).Beide spreken in hun eigen taal: architect Alkemade illustreert de langetermijnopgave beeldend met kwalitatieve voorbeelden en onderzoeker Boelhouwer onderbouwt de actuele urgentie met kwantitatieve data. Maar verstaan ze elkaar? Het lijkt erop dat ze kilometers ver uit elkaar staan maar uiteindelijk spraken ze over dezelfde essentiële waarden bij de woningopgave: het recht op een fatsoenlijke en duurzame woonomgeving voor iedereen in Nederland. Een verslag van de bijeenkomst.Housing Institutions & Governanc
Erfgoed van na 1965 in rijksbezit: De overheid als rentmeester en inspirerend ambassadeur
No full textMet het vertrek van rijksbouwmeester Floris Alkemade komt een einde aan een aantal van zijn zogenoemde Ambassadeursprojecten. Deze voorbeeldprojecten van het Rijksvastgoedbedrijf hebben tijdens de zittingsperiode van Alkemade speciale aandacht gekregen. Ze houden verband met de ruimtelijke kwaliteit van gebouwen, stad en landschap, met bijzondere aandacht voor natuur en de sociaal-maatschappelijke en culturele context. Eén project betreft de evaluatie en mogelijk actualisering van het programma Inspirerende Bouwkunst, dat twintig jaar geleden in gang is gezet door Alkemades voorganger Jo Coenen....Heritage & Value
User requirements Massive Point Clouds for eSciences (WP1)
No full textThis report is a milestone in work package 1 (WP1) of the project Massive point clouds for eSciences. In WP1 the basic functionalities needed for a new Point Cloud Spatial Database Management System are identified. This is achieved by (1) literature research, (2) discussions with the project members, and (3) customer surveys. In this work package three organizations TU Delft, Rijkswaterstaat and Fugro have worked together to assemble the user requirements for a new Point Cloud Spatial Database Management System. The following persons were involved in this work package. A.E. Nonhebel (Ardi) TU Delft, TU Delft Library/3TU.Datacentrum (work package manager) Ir. I. Alkemade (Ingrid) Rijkswaterstaat, Centrale Informatievoorziening Ir. M.P. Kodde (Martin) Fugro GeoServices B.V. Drs. T.P.M. Tijssen (Theo) TU Delft, Onderzoeksinstituut OTB, department of GIS Technology Prof.dr.ir. P.J.M. van Oosterom (Peter) TU Delft, Onderzoeksinstituut OTB, department of GIS Technology Drs. P.M. Suijker (Paul) TU Delft, TU Delft Library, section Research support During the investigation the Up-to-date Height Model of the Netherlands1 (AHN) datasets have been used as an example of the type of data that will be included in the new point cloud spatial DBMS. The AHN data consists of raster data and point cloud data. Both data types have been considered.LibraryDelft University of Technolog
Three-dimensional Nanostructures Fabricated by Ion-Beam-Induced Deposition
No full textThe direct writing technology known as ion-beam-induced deposition (IBID) has been attracting attention mainly because of its high degree of flexibility of locally prototyping three-dimensional (3D) nanostructures. These high-resolution nanostructures have various research applications. However, no systematic study of the capability of IBID to fabricate 3D nanostructures has been published to date. This is partly caused by the lack of suitable methods to monitor and to access the numerous time-varying process parameters and our lacking overview of the interplay between the relevant parameters. This thesis partially aims to fill this gap. This thesis mainly includes three parts: (1) Exploration of the limits of IBID to fabricate nanopillars. Firstly to fabricate IBID pillars in a controllable and reproducible manner, we have studied the optimization of the pillar growth conditions. With the conventional Ga+ FIB and the novel He+ FIB approaches, the influence of precursor surface density and of the ion beam interaction have been investigated, respectively. Moreover, relevant simulation work is discussed to explain the interplay between vertical and lateral growth and their dependence on precursor depletion and replenishment. Combining these results, a comparison between Ga+ and He+ IBID pillar growth is made. Secondly, to improve the quality of IBID pillars, we have studied the formation of the irregular sidewall surface and the halo viz. the deposits around the bases of a typical Ga+ IBID pillar by comparing pillars grown on either an insulating Si3 N4 membrane or on a semiconducting Si wafer. Thirdly, by changing the substrate properties and the distance between neighboring pillars, we have studied the proximity effect in IBID pillar growth. This proximity effect is important when fabricating dense pillar arrays. The proximity effect of He+ IBID is similar to that of Ga+ IBID, though the trend is much less pronounced. (2) Exploration of the limits of IBID to fabricate nanopores in thin membranes. We have demonstrated that sub-10-nm-diameter nanopores in a Si3 N4 membrane can be fabricated in a single Ga+ IBID step by carefully adjusting the ion beam and gas exposure conditions. This is accomplished by exploiting the competition between sputtering and deposition processes during IBID. Apart from the simplicity and the speed, another advantage is a broad choice of material for the deposit and the membrane. At various stages of pore formation we have studied the chemical composition and the shape of the pore, which are the factors that determine the functionalization of the nanopores. For this purpose, energy dispersive x-ray (EDX), electron energy loss spectroscopy (EELS) analysis have been used for determining the chemical composition, and 3D electron tomography for determining the shape of the pore. It is found that the chemical structure in the rim of the pore depends on the properties of the precursor gas. Furthermore, simulation shows that the forward and the backward sputtering depend differently on membrane thickness. This difference can also play a role in the pore formation and shrinkage. (3) Study of the IBID process mechanisms. We have done a series of experiments to distinguish the roles of different mechanisms involved in IBID. Firstly we have found a significant contribution of secondary particles to Ga+ IBID. This result was obtained by comparing the volume of a deposited box with that of the material deposited onto a nearby sidewall. Subsequently we have investigated two models that describe IBID in terms of the impact of secondary electrons and of sputtered atoms, respectively. For this purpose, the yields of deposition, sputtering, and secondary electron emission as well as the energy spectra of the secondary electrons were measured in situ during Ga+ IBID as functions of ion incident angle and energy. The results indicate that the sputtered atom model describes Ga+ IBID better than the secondary electron model. I also briefly discuss the contribution of primary ions. Based on these results, we review the studies on the mechanisms of IBID with Ga+ or He+ ion beams and EBID mechanisms reported in the literature. I conclude that IBID has to be described by multiple mechanisms. The dominating mechanism is in Ga+ IBID related to sputtering, while in He+ IBID and EBID to secondary electron emission. In this thesis work, we have studied the capability of IBID to grow 3D nanostructures. Future efforts, for instance improvement of the purity of the deposits, will be necessary to functionalize IBID nanostructures.Kavli Institute of NanoscienceApplied Science
Actin Transport - Analyzed datasets
No full textThese are the analyzed data for Actin Transport by growing microtubule ends. The data was (partially manually) analyzed using ImageJ and the datasets provided in the folder 'Actin Transport - raw data'.<br
On a differential equation and the Laplace-Stieltjes transform in the theory of linear positive operators
No full textApplied SciencesApplied Science
Stealth fiducial markers: Enhancing re-detection efficacy of defects on blank wafers
No full textIn this thesis a stealth fiducial marker system for blank wafers is designed, fabricated and validated. The goal of this marker system it to map the coordinates of TNO’s Rapid Nano (a fast optical inspection tool) to the coordinates of scanning electron microscopes and atomic force microscopes. This way defects, that have been detected in the Rapid Nano, can be re-detected with a higher efficacy in the scanning electron microscope or atomic force microscope for further study.Applied PhysicsKavli Nanolab/TNOApplied Science
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