1,720,952 research outputs found
Evaluating the procurement documents of Dutch water boards portfolio: A step towards more reliable public clients
No full textAlthough a considerable amount of literature has addressed the public procurement in the construction industry, still little is known about procurement in small and repetitive activities. In practice, however, public clients are often involved in repetitive tasks such as maintenance activities. Dutch water boards, regional governmental bodies responsible for providing water management services, are the focus of this study. For this research, three main procurement documents of the water boards were performed using content analysis. The aim is to evaluate these documents and to identify the typology of the repetitive activities and the procurement volume of these tasks from a portfolio perspective of the public client. Most of the contractors/suppliers involved in these activities are local Small and Medium-Sized Enterprises (SMEs). The findings of the study indicate that insights into the typologies of these repetitive works and their expected volume over time delivers crucial value for the public procurer. Given the amount of repetitive works procured by public clients, creating such an insight to both clients as well as contractors can ultimately increase efficiency and improve investment opportunities.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Design & Construction Managemen
The Metamorphic, The Subtle and The Awkward: Three Thoughts on Indigenization
No full textThis paper highlights three occasionally overlooked aspects of Indigenization: the metamorphic, the subtle and the awkward. First, the author discusses how an epistemological shudder arising from the tension between Indigenous and non-Indigenous ways of knowing is an essential first step toward Indigenization. For the author, our Indigenization journey must begin by changing our minds and hearts. Second, the author draws on his own teaching experience toward a discussion of the subtle ways in which Indigenous knowledge can be integrated into existing lessons. The author argues that Indigenization does not have to be ostentatious as long as it is authentic. Finally, the author concludes by drawing on settler-educator Sheena Koops‘ (2018) concept of the “awkward ally.” Koops‘ awkward ally is someone who is not afraid to look silly or be proven wrong about something in the pursuit of allyship with Indigenous peoples. Whereas faculty, staff and students can sometimes be incapacitated by uncertainties or a lack of knowledge, Koops‘ concept of the awkward ally reminds us that it is okay to make mistakes as long as we are willing to learn from them. The overall message of this paper is that if we want to Indigenize our teaching, we should start with ourselves and be unafraid to make mistakes
Classifying the contextual dependency of critical quality factors: A study towards the identification of critical quality factors in the field of project management
No full textCivil Engineering and GeosciencesStructural EngineeringConstruction Management and Engineerin
The Heijplaat Science Center
No full textA design for a Science Center at Heijplaat Rotterdam. An architectural design developed in a double graduation track where research has been done on building integrated systems for climate regulation and indoor comfort.Architectural EngineeringBuilding TechnologyArchitectur
Influence of Transient Effects on Fitting Parameters to SAG Foam Core-Foods
No full textFoam is a promising means of increasing sweep efficiency in enhanced oil recovery processes where gas is injected into a reservoir. However, the effectiveness of foam is hard to predict due to its complex behavior. Therefore accurate modeling is important to effectively predict field performance. This requires correct foam parameters in reservoir simulation. These parameters can be fit to laboratory data where gas is injected into surfactant-saturated rock samples. Foam simulation models can be used to translate experimental laboratory data to the field scale. Unfortunately, the widely used local equilibrium model assumes instant local equilibrium everywhere, while the lab data shows dynamic behavior. Distortion in late-time simulation results of the model could occur as consequence of not having a good fit in the dynamic period, where the chosen foam modeling parameters are incorrect. The aim of this paper is to research how much influence this mismatch has on the fit of the model to the laboratory data, which is taken from literature. Testing will be performed with the use of a one-dimensional dynamic foam model. The findings in this work do not indicate clear evidence that fitting long-time behavior is distorted by disregarding a good fit in dynamic short-time behavior. This means that the researched modeling parameters could be correct in predicting local equilibrium behavior. Even when a good fit for short times where dynamics play a role is disregarded.Petroleum Engineering & GeosciencesGeosciences & EngineeringCivil Engineering and Geoscience
Public project manager's perspective on project success: A research into the success determination of construction projects by project managers of the public party
No full textParties working together on a project usually have different interests in executing that project, but they all aim at achieving project success. This project success has been widely discussed in literature since reaching it is the main goal of each party; but what project success actually is and how it can be determined differs per party. In project success a distinction is made between success criteria, the set of standards by which the measurement of success occurs, and success factors, those aspects that directly or indirectly influence project success. In this research success criteria are studied. Currently there is a lot of literature on project success and also on its criteria, but it only very limitedly relates to the public sector. Which is remarkable since researchers agree that project success is dependent on the perspective taken to look at it: an architect may have a different view on when a project is a success than a contractor. The proposition is that, due to the difference in nature of organization between public and private parties, each uses its own set of success criteria for the judgement of its project success. This research focuses on the public project manager: the operational manager of the public party who is commissioned within his own organisation to carry out the assignment; in this role he represents the ‘client’ to the contracting parties with which he has contact in executing the project. As mentioned project success perception depends on the perspective taken to judge it; and if there is indeed a different success perception for a public party than for a private party this discrepancy will become most clear at the operational level, where they work in close contact. This research aims at closing the now existing knowledge gap and identifying the success criteria relevant for the public project manager. By means of Q-methodology, a method used for studying subjectivity, the view on project success of 28 interviewed public project managers was assembled and analysed. The first step in using this method was to determine the Q-sample: the complete list of criteria relevant for the public project manager. To determine the public project manager’s view on success the 28 managers were asked to rank these criteria in relation to their importance in determining project success. This list of relevant criteria was formulated through studying literature and executing five test interviews; firstly 25 criteria were distinguished of which the representativeness for the public sector was checked. Eventually a number of criteria were combined, a number of criteria was left out due to lack of relevance for public project managers and a few other criteria were added, leading to a final list consisting of 19 criteria. In determining this Q-sample, two important conclusions were drawn. Firstly, since literature focuses mainly on the private sector, many criteria are too commercially oriented to reflect the public organisation’s nature; in these cases the public equivalent of the private sector criterion is determined. Secondly, a number of criteria presumed to be relevant for public sector success determination are not found in literature. These new criteria were added to the Q-sample and their relevance can be determined after the research has been conducted.Construction Management and EngineeringStructural EngineeringCivil Engineering and Geoscience
Design and evaluation of carbon fibre-reinforced launch packages with segmented, copper and molybdenum fibre armatures
No full textFibre armatures have been studied both dynamically and statically to gain insight in their electrothermal and mechanical behaviour. In the first part of this paper, the results of launch experiments with single and multi-segment copper and molybdenum fibre armatures integrated in carbon-fibre reinforced launch packages are discussed. The launch experiments with Cu fibre armatures showed an improved reproducibility and a higher transition velocity. The poor results of the launch experiments with the Mo fibre armatures thus far, are explained with results of armature compliance and resistance measurements. In the second part, results are presented which are obtained from static experiments in an armature test bed. Using miniature B-dot probes and Rogowski coils, the magnetic field diffusion into monobloc and fibre armatures with identical geometry has been studied. The results show a significant difference in diffusion behaviour between the two types of armatures. It appears that the magnetic field diffuses faster into the fibre armature. The experimental data are compared with the results of calculations of the magnetic field distribution in both armatures based on 2D- and 3Dfinite element computer simulations. The results of the ID-simulations appear to confirm the measured results for monobloc and fibre armatures only qualitatively. The experimental results obtained with monobloc armatures agree with the results of the 3D-simulations in a quantitative sense. © 1997 IEEE
How to allocate risks? Research into the allocation of risks between public and private organisations for large infrastructure projects in the Netherlands
No full textConstruction Management and EngineeringStructural EngineeringCivil Engineering and Geoscience
Samenwerking in beheer en onderhoud: De rol van het mkb als partner
No full textOndanks het grote aantal repetitieve, kleine activiteiten dat wordt uitgevoerd voor publieke opdrachtgevers, ontbreekt het zowel in de praktijk als in de wetenschappelijke literatuur aan inzicht in de succesfactoren van dit type opgaven. Dit beperkt de mogelijkheden tot het doorvoeren van relevante verbeteringen ten aanzien van de samenwerking en de eigen rol van de publieke en private organisaties hierin. Dit onderzoek heeft zich daarom gericht op de samenwerking van waterschappen en marktpartijen specifiek bij kleinschalige repetitieve werkzaamheden. Het onderzoek bestaat uit de analyse van portfolio's van waterschappen en interviews met zowel waterschapsmedewerkers als marktpartijen.Uit de analyse van inkooporders blijkt dat repetitive werkzaamheden kunnen worden onderverdeeld in vijf typen, waarvan werkzaamheden aan watergangen de meest voorkomende zijn. Het inzicht in deze activiteiten en hun financiële omvang is van cruciaal belang voor optimalisatie.Het onderzoek identificeert de elementen in de samenwerking tussen waterschappen en marktpartijen die bijdragen aan efficiëntere uitvoering van repetitive werkzaamheden: inzicht in de markt, bundeling door opdrachtgever(s) in relatie tot ondernemerschap bij de opdrachtnemer(s), communicatie, lerend vermogen, en formele en informele contractmanagement.Dit onderzoek draagt bij aan het optimaliseren van de samenwerking tussen waterschappen en marktpartijen in repetitive werkzaamheden, wat leidt tot efficiëntere en effectievere uitvoering van deze taken in de waterbouwsector.The research is funded by the Unie van Waterschappen (Dutch Water Authorities), six water authorities (Hoogheemraadschap Hollands Noorderkwartier, waterschap Noorderzijlvest, waterschap Rivierenland, Hoogheemraadschap van Delfland, waterschap Scheldestromen, waterschap Hollandse Delta) and Hoogwaterbeschermingsprogramma.Design & Construction Managemen
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