43 research outputs found
Evaluation and promotion: The cooperative purchase experience of academic libraries in China
No full textCALIS is a nationwide academic library consortium in China. By coordinating, guiding, and organizing academic libraries, CALIS aims to minimize spending while obtaining foreign resources with the best prices and services. It also aims to meet the demands of teaching and research via the CALIS cooperative purchase service. Since 2005, there has been a customer satisfaction survey to evaluate this cooperative purchase service and the databases subscribed to by the CALIS consortium during the CALIS annual "imported database training week". 494 staff members from 246 libraries took part in the fourth such survey to evaluate 87 databases cooperatively purchased in 2009. According to the survey. CALIS releases database usage reports and database evaluation rankings to help libraries analysis costs and make more informed collection developments decisions. Such survey activities provide a win-win situation, not only for CALIS and its member libraries, but also for database vendors. Survey results and usage reports help libraries analyze the quality of resources and provide evidence for libraries to choose among different purchasing options. Also, more promotional work has been done to enhance understanding, solve libraries' problems, and improve service quality. Finally, survey results and database evaluation rankings have been used to urge database vendors and publishers to make improvements relevant to libraries' development strategies. (C) 2012 Elsevier Ltd. All rights reserved.Information Science & Library ScienceSSCI5ARTICLE3-497-1063
CALIS - A CALibration Insertion System for the DarkSide-50 dark matter search experiment
No full text© 2017 The Author(s). This paper describes the design, fabrication, commissioning and use of a CALibration source Insertion System (CALIS) in the DarkSide-50 direct dark matter search experiment. CALIS deploys radioactive sources into the liquid scintillator veto to characterize the detector response and detection efficiency of the DarkSide-50 Liquid Argon Time Projection Chamber, and the surrounding 30 t organic liquid scintillator neutron veto. It was commissioned in September 2014 and has been used successfully in several gamma and neutron source campaigns since then. A description of the hardware and an excerpt of calibration analysis results are given below
Reconstruction and safety assessment of the Hengelo brinefield phase 1 area
No full textSince 1918 AkzoNobel produces salt by means of solution mining from the bedded Triassic Röt Evaporite deposit in the eastern part of the Netherlands. In this technique water is pumped into the rock salt layer through a well and dissolves the halite in situ. Subsequently the brine is pumped to the purification plant at surface level where the NaCl is extracted from the brine after several impurities have been removed. Near the city of Hengelo, the Hengelo Brine field has been exploited by AkzoNobel since 1933 and based on the technological progress during the years it can be divided into five phases:1. 1933-1958, 53 wells, 42 caverns; 2.1959-1975, 226 wells, 94 caverns; 3.1976-2005, 213 wells, 72 caverns; 4.2006-2013, 37 wells, 36 caverns; 5.2014-present day, 31 wells, 31 caverns. The area corresponding to the first phase comprises 42 caverns which have been developed from 50 production wells. The production wells have been drilled between 1933 and 1958 and during later stages 3 appraisal wells have been drilled.Present-day AkzoNobel pursues stable caverns at the end of their production life. This is achieved by leaving a sufficient thickness of salt in the roof above the cavity. The result is a ductile boundary between the void and the overburden material. The directly overlain anhydrite layer is much stiffer and shows brittle behavior. When this anhydrite layer is not supported by a sufficient amount of rock salt underneath it can potentially collapse. This roof failure occurs when the span of the exposed anhydrite is large enough. The fragments of the collapsed roof layer will deposit on the bottom of the cavern leaving the next roof layer exposed. With each roof layer collapsing the cavern top and bottom attain a new depth. This process is called cavern migration, which continues until the cavern reaches a status where the roof layer is stable either by sufficient support or strength. Most of the 42 caverns of the phase 1 area have migrated and in five cases this led to significant surface subsidence. Currently AkzoNobel prepares abandonment of the last open wells in the phase 1 area. In order to proof long term safety after closure, the caverns have been examined, simulated, reconstructed, and modelled. By analyzing the available data and scrutinizing a few caverns where extensive migration did occur, the cavern migration behavior and its influential parameters were identified. This report clarifies how the caverns have been reconstructed and how the maximum migration potential is determined with the model. The phase 1 area comprises the oldest part of the Hengelo Brine field. The wells were drilled between 1933 and 1958. During this phase some of the wells were positioned close to each other, intentionally allowing interconnections. The motive was to complete these wells as doublets, while the rest were setup as single completion caverns. Despite these intentions, the leaching during this phase was performed in a less restrained manner than what is acceptable today. The majority of the caverns in the phase 1 area have established unintentional connections and were completed as series of caverns. Due to this lack of control overmining occurred at some of the caverns and as a result most of the caverns have migrated upwards through the overburden and some induced significant subsidence at the surface. As the amount of data and especially measurements of these phase 1 caverns is scarce, the caverns needed to be reconstructed to enable a comprehensive analysis. In order to reconstruct the cavern development and final dimensions, the caverns have been simulated based on their historical production and on interpretations of the geology and logbooks. After cross-correlating the dimensions with the available data, the dimensions are used in an analytical model. Considering multiple influential parameters the post-production ‘residual’ volume and dimensions of the caverns are deduced. Thereafter the maximum potential migration is determined using a migration model.Applied Earth Sciences | European Mining Cours
Development of dustproof, low pressure drop reactors with structured catalyst packings: The Bead String Reactor and the Zeolite-covered Screen Reactor
No full textApplied Science
Het Meergeneratiehuis: Een woonvorm met een multigenerationeel sociaal bewonersnetwerk
No full textEen onderzoek naar een woonvorm waarin de bewoners een multigenerationeel sociaal netwerk vormen en elkaar informele zorg en ondersteuning verlenen als alternatief op intramurale zorgVeldacademieArchitectureArchitecture and The Built Environmen
De Buurtfabriek
No full textEen onderzoek naar een nieuwe architectonische oplossing voor een combinatie tussen zorg en welzijn waarbij ontmoeting centraal staat.Architecture and The Built EnvironmentArchitectureVeldacademi
People oriented sustainable design: Renovation of post war social housing in Rotterdam Lombardijen
No full textHet doel van dit onderzoek is om milieumaatregelen te vinden, die door tegemoet te komen aan de wensen en behoeften van de bewoners en de woningbouwcorporatie, kunnen helpen om de sociale problematiek te verminderen. Het betreft een complexe opgave met sociale- en milieu problematiek ("ongelukkige" bewoners) in sociale huisvesting met achterstallig onderhoud. De complexiteit komt voort uit de, veelal tegenstrijdige, belangen van de diverse partijen die met het gebied te maken hebben en de omgang met de bestaande situatie. De hoofdvraag: "Hoe kunnen de wensen en behoeften van de bewoners en de eigenaar van de Dura Coignet portieketagewoningen in Rotterdam Lombardijen worden behartigd op een milieuvriendelijke manier?" wordt beantwoord met een synthese van de antwoorden van de deelvragen. Het onderzoek wordt ingekaderd door het te richten op deze specifieke locatie. Binnen deze locatie zijn de wensen en belangen van de bewoners onderzocht door middel van literatuuronderzoek, interviews en een enquête. Daarnaast is er op basis van literatuur een inventarisatie gemaakt van milieumaatregelen die in dit gebied gerealiseerd zouden kunnen worden. Het antwoord op de hoofdvraag is waar belangen van bewoners en de woningbouwcorporatie, overlappen met milieumaatregelen. Om de hoofdvraag te beantwoorden is deze opgesplitst in behandelbare delen. Dit heeft geleid tot de volgende vier deelvragen: 1. Wat zijn de kenmerken en de sterke en zwakke punten van de Dura Coignet portieketagewoningen en hun omgeving in Rotterdam Lombardijen? 2. Wat zijn de wensen en behoeften van de bewoners van de Dura Coignet portieketagewoningen in Rotterdam Lombardijen? 3. Wat zijn de wensen en behoeften van woningcorporatie Havensteder ten opzichte van de Dura Coignet portieketagewoningen in Rotterdam Lombardijen? 4. Welke maatregelen aan de Dura Coignet portieketagewoningen in Rotterdam Lombardijen en de lokale omgeving zouden de milieubelasting (schade aan milieu) kunnen verlagen? Aan veel bewonerswensen blijkt tegemoet gekomen te kunnen worden met milieuvriendelijke maatregelen. Wanneer correct uitgevoerd, zouden nagenoeg alle milieumaatregelen directe voordelen op kunnen leveren voor de bewoners. Deze voordelen liggen op het gebied van gezondheid en comfort, maar ook in het beperken van overlast, veiligheid, controle, ontspanning, een aantrekkelijke omgeving, meer groen, het stimuleren van sociaal contact en ze kunnen in sommige gevallen op de langere termijn ook financieel voordelig zijn. Allemaal elementen die bewoners aangeven belangrijk te vinden. Daaruit blijkt een sterke overlap tussen milieumaatregelen en bewonerswensen. Binnen de wensen van de corporatie bestaat een conflict tussen wensen die goed zijn voor mens en milieu aan de ene kant, en de noodzaak voor financiële continuïteit aan de andere kant. Daarbij komt dat de investerende partij niet altijd de partij is die de (financiële) baten geniet. Financiering van veel milieumaatregelen is daardoor moeilijker. Mogelijk is dit probleem met toekomstige onderzoeken op te lossen. In antwoord op de hoofdvraag van dit onderzoek kan worden gesteld dat meeste wensen en behoeften van bewoners, en een deel van die van de corporatie, kunnen worden behartigd op een milieuvriendelijke wijze door milieumaatregelen te betrekken bij het ontwerp vanaf de allereerste planvorming.VeldacademieArchitectureArchitecture and The Built Environmen
Klus Plus - Transformatie particuliere woningvoorraad op de Pleinweg, Rotterdam
No full textVeldacademieArchitectureArchitecture and The Built Environmen
A digital workflow for 3D printed full-colour ocular prosthetics
No full textFabricating custom-made ocular prostheses is currently a highly-skilled, labour-intense and non-reproducible process performed by an ocularist. Custom-fit prostheses are made from acrylic using a plaster mould, the iris is hand-painted, and veins are mimicked by adding red embroidery threads. Digital production techniques provide opportunities to improve and automate this process. Therefore, this graduation project aims to research a possible digital workflow, including data capturing and calibration, modelling and 3D printing, for producing 3D-printed full-colour ocular prosthetics. The workflow should capture and reproduce the eye’s appearance to create a life-like ocular prosthesis that resembles the patient’s facial appearance as closely as possible.Research into manual and digital production techniques results in a proposed digital workflow showing how a prosthesis can be produced. The workflow consists of five phases: collect, design, produce, post-process and finalise and shows how the patient and the ocularist are involved.Data capturing and calibrationThe patient’s eye colour data needs to be captured and calibrated to ensure accurate colour reproduction of the eye. The images can be calibrated by applying a colour profile made from a colour target to correct the camera error. The capturing research showed that photographing is a suitable technique to collect colour data for accurate colour reproduction if the eye and the colour target are shot under a controlled light condition. Multiple calibrated iris images were printed and compared to the participant’s eye to review the capturing and calibration process.ModellingThe modelling research showed that a parametric model based on a computational design template is a suitable solution for adjusting the prosthesis model to a personalised shape.The template should automatically model the inner parts of the prosthesis based on the outer shape and important parameters, such as the iris and pupil diameter. The first steps towards creating this computational design template are shown in this report by modelling a parametric iris disk.3D PrintingThe full-colour 3D printing technology's capabilities were exploited to reproduce best the various features of a human eye, such as the sclera, blood vessels, pupil, cornea and iris. This investigation showed that mapping an eye image to the model does not always give the desired result and that different printing techniques are suitable for different eye parts. Alternative approaches, like contoning, sclera generator and ‘dotting’ and ‘varying line deepness’ techniques, are exploited and show promising results. However, a voxel-based printing technique is needed to combine and control these approaches, and current software lacks these possibilities.Two experts and five users validated prostheses produced following the proposed digital workflow through an interview and by photographing them next to their eyes. All participants were impressed by the prosthesis and rated the total prosthesis as ‘sufficient’ or ‘good’. Nonetheless, it remains a challenge to reproduce the exact iris colour, structure and veins. A voxel-based printing technique is recommended to have more control over these various aspects. More research is needed to explore the possibilities for controlling colour on a voxel level and to model a complete voxel-based prosthesis. The comparison between the manual and digital workflow showed that 3D printing results in significant time savings since over four hours of manual work could be replaced by 3D printing. 3D printing ocular prostheses make the workflow reproducible and faster, which leads to more accessible and affordable prostheses in the future.Integrated Product Desig
Social Sustainability - Afrikaanderwijk Rotterdam
No full textDesign aim: Keep social potential in the Afrikaanderwijk by designing a building that enables and facilitates the change of its inhabitant’s economical and social situation.Explore LabArchitectur
