153 research outputs found
Car and truck tire wear particles in road dust samples - A quantitative comparison with traditional microplastic polymer mass loads
No full textThis data set provides quantitative mass loads of tire wear particles (TWP) and traditional microplastics (C-PE, C-PP, C-PS, C-PVC, C-PMMA, C-PET, C-PC, C-MDI-PUR) in the urban environment. A differentiation between car and truck tire wear (CTT and TTT) was presented. The C-PVC cluster might be interfered by additional anthropogenic sources, as the C-PVC indicator naphthalene is highly unspecific, accordingly the given results primarily reflect the order of magnitude. In this study, road dusts were analyzed and measured with pyrolysis-gas chromatography-mass spectronomy (Py-GC/MS). Pyrolysis was performed at 590°C in a micro-furnace pyrolizer (EGA/Py-3030D, FrontierLabs) connected to an auto-shot sampler (AS-1020E, FrontierLabs). A gas chromatograph (6890 N, Agilent) equipped with a DB-5MS column was used for separation. The mass spectrometer (MSD 5973, Agilent) operated with full-scan mode. A gas chromatograph (6890 N, Agilent) equipped with a DB-5MS column was used for separation. The mass spectrometer (MSD 5977A) operated with full-scan mode. Additional information are found in the supplementary information of the related study. Road dust samples were collected in a mid-sized German city (Oldenburg). Road dust were contaminated with traditional microplastics and tire wear particles. The here presented data are part of a study, which has been published in February 2021 (doi: 10.1016/j.scitotenv.2021.145667)
VAN DER VEEN, A. Maurits; "Ideas, Interests and Foreign Aid"; Cambridge University Press; New York, United States of America; 2011; pp. 290. ISBN: 978-0-521-26409-9 Paperback
No full textAuthor: VAN DER VEEN, A. Maurits; "Ideas, Interests and Foreign Aid"; Cambridge University Press; New York, United States of America; 2011; pp. 290. ISBN: 978-0-521-26409-9 Paperbac
Een pleidooi voor verdediging: Maurits Dekker en de retoriek van 'Waarom ik niet krankzinnig ben' (1929)
No full textIn the twenties and thirties of the twentieth century, the Dutch author Maurits Dekker (1898-1962) published a number of psychological novels in which madness plays a significant role. One of those novels, Waarom ik niet krankzinnig ben (Why I am not insane, 1929), was originally published as a mystification. As Dekker explains in the preface to the second edition, he wanted to lead his critics up the garden path and presented himself as a Russian author. Conspicuously, the rhetoric of his preface resembles the rhetoric of the allegedly mad narrator of Waarom ik niet krankzinnig ben. In the final section of the article, the opening paragraph of the novel will be analysed precisely in terms of rhetoric and speech acts. This enables us to specify the way in which the narrator accuses himself in his excuses, the way in which he verbally attacks the narratee even though he claims he is only defending himself against the judgments of the psychiatrists
A distributed amplifier system for bilayer lipid membrane (BLM) arrays with noise and individual offset cancellation
No full textLipid bilayer membrane (BLM) arrays are required for high throughput analysis, for example drug screening or advanced DNA sequencing. Complex microfluidic devices are being developed but these are restricted in terms of array size and structure or have integrated electronic sensing with limited noise performance. We present a compact and scalable multichannel electrophysiology platform based on a hybrid approach that combines integrated state-of-the-art microelectronics with low-cost disposable fluidics providing a platform for high-quality parallel single ion channel recording. Specifically, we have developed a new integrated circuit amplifier based on a novel noise cancellation scheme that eliminates flicker noise derived from devices under test and amplifiers. The system is demonstrated through the simultaneous recording of ion channel activity from eight bilayer membranes. The platform is scalable and could be extended to much larger array sizes, limited only by electronic data decimation and communication capabilities
Att ta spjärn mot glömskan
No full textThis book is a Festschrift to Maurits Nyström with nine texts chosen from his extensive publications. The selection reflects his broad and deep knowledge of the history of Norrbotten, as well as his ability to popularize research results. The articles deal with the region’s development from a rural farming society to a modern industrial society. The texts describe the distinctive character of Norrbotten, with its many small freeholders, few and small cities with small-scale capitalist enterprises and an industrialization based mainly on the exploitation of raw materials. In some of the articles, the author deals with these features in a broad sense and in others in more detail, with examples from individual trading houses, coaching inns and small farms. Norrbotten has experienced a wave of out-migration during the past decades, and in a couple of articles Nyström studies how the local population has dealt with preserving the memories of a bygone era. What has been preserved, by whom and why? Fighting Against Forgetfulness draws attention to events, processes and contexts that are unknown to many people in our own time and that have been forgotten, neglected or dealt with sparingly by professional historians. </p
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
Sewing the Body of Christ : Eucharist wafer souvenirs stitched into fifteenth-century manuscripts, primarily in the Netherlands
No full textBooks of hours in the fifteenth century occupied several social and devotional roles. People used them to store small objects, including metal badges. Although the cultural practice of sewing in badges was widespread in the late Middle Ages, nearly all of the badges were removed (by later collectors). This article examines the practice by considering needle holes and offsets in the soft parchment, which indicate the shape of the badges and where they were attached. Noting that vast majority of metal offsets in books of hours are round, the author posits that these were not impressed by pilgrims’ badges, as is often repeated in the scholarly literature, but rather by tokens that commemorate having taken the Eucharist. The round badges are the same size and shape and bear the same imagery as host wafers. Owners stitched such badges into their books’ margins at locations relevant to Eucharistic piety. When they were sewn into books, Eucharist badges reconfigured the book as a shrine that recorded a votary’s pursuit of Communion.Peer reviewe
Performance predictions for electromagnetic launching with multi-fibre solid brush armatures and resistively layered rail accelerators
No full textIn the literature on EML research, a number of proposals have been made to suppress the negative influence of the velocity skin effect on the performance of solid armatures during electromagnetic launch. In this paper, the results of a study of two of these methods, i.e. the application of multi-fibre solid brush armatures and the use of accelerator rails with a resistive layer, are presented. This study is performed by means of two-dimensional finite element computer simulations of the electrothermal behaviour of the armature and the rails during the launch process. A description of the electrothermal model used in the simulations is given. Here, the fibre armatures are regarded as made of materials with an anisotropic electrical and thermal conductivity. The results for the current distribution in a rectangular multi-fibre solid brush armature obtained from the simulations agree with the results of an analytical method. It is shown that fibre armatures have a more homogeneous current distribution during the acceleration process than monobloc armatures. U-shaped molybdenum multi-fibre solid brush armatures are good candidates for arc erosion-free launching if the electrical insulation of the fibres can be maintained at increasing temperature. Simulations also show that the skin depth in monobloc and fibre armatures can be increased by using rails with a resistive layer with suitable material properties
Een beeld van een kust: Inspiratie voor de Kustnota
No full textDe kust als spiegel / Maurits Groen De levende kust / Govert D. Geldof Integraal beleid : te kust en te keur? / Gerrit Hagelstein en Philip Idenburg De nieuwe kusten van Noordzee en IJsselmeer / Wouter van Dieren De kust als menselijke gradiënt / Reinier Jan Scheele Duinen in een levende kust / Helias Udo de Haas Het verlangen naar de kust : de kust als toeristisch-recreatief domein / Theo Beckers De kust over 25 jaar : een normatief gezichtspunt / Karel Soudijn Een beeld van kust / Anne van der Meidenkustnot
Abundances of large microplastics (L-MP, 500-5000 µm) in surface waters of the Weser estuary and the German North Sea (April 2018)
No full textIn order to assess pollution with large microplastics (L-MP, 500-5000 µm) in the Lower Weser and transition to the German North Sea, surface water samples were collected with the RV Otzum (ICBM, Institute for Chemistry and Biology of the Marine Environment), as well as with the RV Uthörn (AWI, Alfred-Wegener-Institute) in April 2018. Sampling was performed using a microplastic net (mesh size: 300 µm), followed by filtration in the laboratory over a 500 µm stainless steel sieve. Putative MP items in the size range 500-5000 µm were analysed by means of Attenuated Total Reflection - FTIR in order to determine the underlying synthetic polymer. Dominant polymer type in the L-MP sample fraction was polyethylene. Concentrations ranged between 1 × 10⁻² m⁻³ and 9.8 × 10⁻¹ m⁻³. The highest MP concentration was measured upstream the Weser Weir
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