35 research outputs found
Autour de la mère morte
No full textBook synopsis: Marie Ndiaye stands out as one of the most interesting of contemporary French literature voice. Winning the Prix Goncourt in November 2009 Three powerful women confirms this finding.
literary research was quick to question the strange world of his novels, his plays and his new that seem to defy any attempt to generic classification. The ndiayïen realism acts correction preset shapes that suggest a consistency that reality does not. The author denies the relationship with the molds of traditional genres and waives integrate into one big happy "family" literary.
It is in this perspective that this book proposes to read the work of Marie Ndiaye reflecting on topics such as mechanisms of social exclusion, the strangeness and discursive processes of racialization as well as the poetic dimension of his writing and managing the image of the author and media issues of representation
Passive and Active Thermal Management of Bonded Bare-Dice Laser Diodes on Polymer Foil Substrates
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Fabrication and Characterization of a Thermal Flow Sensor Based on the Ensinger Microsystems Technology
No full textThermal mass flow sensors (TMFS) are used to detect the flow rates of gases. TMFS elements are available in different technologies and, depending on the one used, the material choice of substrate, heater, and temperature sensors can limit their performance. In this work, a sensor element based on the Ensinger Microsystems Technology (EMST) is presented that uses PEEK as the substrate, nickel-chromium as the heater, and nickel as the temperature sensor material. The fabrication process of the element is described, the completion to a flow sensor with a control and readout circuit based on discharge time measurement with picosecond resolution is presented, and measurement results are shown, which are compared to sensors with a commercially available element based on thin film technology on ceramic and an element built with discrete components, all using the same electronics. It is shown that the operation of all sensor elements with the proposed readout circuit was successful, flow-dependent signals were achieved, and the performance of TMFS in EMST improved. Its heater shows better results compared to the commercial element due to material choice with a smaller temperature coefficient of resistance. In its current state, the TMFS in EMST is suitable to detect flow rates > 20 SLPM. The performance needs to be improved further, since the temperature sensors still differ too much from another
Thin Film Transferring via PVA Substrate and Contacting of Sensor inside Elastomer Matrix
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Transfer Printing of Conductive Thin Films on PDMS with Soluble Substrates for Flexible Biosensors
No full textIntegration of film-based sensor technology in additively manufactured components
No full textThe optimal placement of sensors in components is often challenging and associated with great manufacturing effort and high costs. At the IMPT, sensor systems have already been successfully manufactured on injection-moulded laser direct structurable (LDS) plastics and electrically contacted by means of LDS. In order to expand the existing range of applications with further advantageous manufacturing processes, the possibility of combining additive manufacturing and LDS is now being investigated with regard to the possibilities of sensor positioning. For this purpose, components are manufactured from LDS capable filament using the FLM process, thin-film-based sensors are completely embedded in them and then electrically contacted using the LDS process
Structuring methods of polymers for low cost sensor manufacturing
No full textA new manufacturing technique for low cost sensor production was developed at the Institute of Micro Production Technology at the Leibniz University Hanover. The herein described manufacturing technique uses common injection molding processes to pre-structure thermoplastic polymers such as Polycarbonate, which can subsequently be used as a substrate to build up sensor structures. The sensor structures are generated by sputter deposition and a following chemical mechanical polishing step. The realized sensor structure can be manufactured neglecting any lithography processes and therefore eliminates expensive clean room technology. This work investigates and optimizes injection molding parameter using design of experiment methods. Following the parameter studies, a manufacturing process designed to realize a micro technologically fabricated injection mold inlay was performed, and the performance of an electroplated Ni based injection mold master form for sensor structure manufacturing evaluated. A temperature sensor on a thermoplastic substrate (polycarbonate) prototype was realized, which was able to prove the feasibility of the manufacturing technique and the robustness of polymers as a substrate material.
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Transfer Printing of Conductive Thin-Films on PDMS with Soluble Substrates for Flexible Biosensors
No full textThe resolution of commercially available electrocorticography (ECoG) electrodes is limited due to the large electrode spacing and, therefore, allows only a limited identification of the active nerve cell area. This paper describes a novel manufacturing process for neural implants with higher spatial resolution combining micro technological processes and Polydimethylsiloxane (PDMS) as the flexible, biocompatible material. The conductive electrode structure is deposited on a water-soluble transfer substrate by Physical Vapor Deposition (PVD) processes. Subsequently, the structure is contacted. Finally, the transfer to PDMS and dissolution of the transfer substrate takes place. In this way, high-resolution conductive structures can be produced on the PDMS. Transferred gold structures exhibit higher adhesion and conductivity than transferred platinum structures. The adhesion was improved by applying a silica surface modification to the conductive layer prior to transferring. Furthermore, the conductive layer is flexible, conductive up to an elongation of 10%, and resistant to sodium chloride solution, mimicking brain fluids. Using the introduced production process, an ECoG electrode was manufactured and characterized for its functionality in an electrochemical impedance measurement. Furthermore, the electrodes are flexible enough to adapt to different shapes. The transfer process can also be carried out in a three-dimensional mold to produce electrodes tailored to the individual patient
