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Wu, Y. (author), Li, X.W. (author), Song, G.M. (author), Wang, Y.M. (author), Narita, T. (author)Oxidation behavior of the uncoated base, Ni–Al coated and Re–Cr-Ni plus Ni–Al coated single-crystal (SC) Ni-based TMS-82+ superalloy is studied under cyclic air at 900ºC for 200 h to assess the oxidation resistance. Regardless of the coating processing, Ni–Al coating is effective in improving the oxidation resistance due to the formation of a...journal article 2010
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Emadi, A. (author), Grabarnik, S. (author), Wu, H. (author), De Graaf, R.F. (author), Wolffenbuttel, R.F. (author)This paper presents spectral measurements using a linear variable optical filter. A LVOF has been developed for operation in the 530 nm–720 nm spectral band and has been fabricated in an IC-compatible process. The LVOF has been mounted on a CMOS camera. A Least Mean Square algorithm has been implemented to calculate the spectrum of light from...journal article 2010
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Wu, C. (author), Van der Have, F. (author), Vastenhouw, B. (author), Dierckx, R.A.J.O. (author), Paans, A.M.J. (author), Beekman, F.J. (author)Purpose: In pinhole SPECT, attenuation of the photon flux on trajectories between source and pinholes affects quantitative accuracy of reconstructed images. Previously we introduced iterative methods that compensate for image degrading effects of detector and pinhole blurring, pinhole sensitivity and scatter for multi-pinhole SPECT. The aim of...journal article 2010
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Liu, C. (author), Emadi, A. (author), Wu, H. (author), De Graaf, G. (author), Wolffenbuttel, R.F. (author)A linear array of 128 Active Pixel Sensors has been developed in standard CMOS technology and a Linear Variable Optical Filter (LVOF) is added using CMOS-compatible post-process, resulting in a single chip highly-integrated highresolution microspectrometer. The optical requirements imposed by the LVOF result in photodetectors with small pitch...conference paper 2010
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Wu, H. (author), Emadi, A. (author), De Graaf, G. (author), Wolffenbuttel, R.F. (author)A thermopile-based detector array for use in a miniaturized Infrared (IR) spectrometer has been designed and fabricated using CMOS compatible MEMS technology. The emphasis is on the optimal of the detector array at the system level, while considering the thermal design, the dimensional constraints of a design on a chip and the CMOS compatibility...conference paper 2010
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Emadi, A. (author), Grabarnik, S. (author), Wu, H. (author), De Graaf, G. (author), Hedsten, K. (author), Enoksson, P. (author), Correia, J.H. (author), Wolffenbuttel, R.F. (author)This paper reports on the functional and spectral characterization of a microspectrometer based on a CMOS detector array covered by an IC-Compatible Linear Variable Optical Filter (LVOF). The Fabry-Perot LVOF is composed of 15 dielectric layers with a tapered middle cavity layer, which has been fabricated in an IC-Compatible process using resist...conference paper 2010
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Wu, H. (author), Emadi, A. (author), De Graaf, G. (author), Wolffenbuttel, R.F. (author)The miniaturized IR spectrometer discussed in this paper is comprised of: slit, planar imaging diffraction grating and Thermo-Electric (TE) detector array, which is fabricated using CMOS compatible MEMS technology. The resolving power is maximized by spacing the TE elements at an as narrow as possible pitch, which is limited by processing...conference paper 2010
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Emadi, A. (author), Wu, H. (author), De Graaf, G. (author), Wolffenbuttel, R.F. (author)This paper reports on a CMOS-Compatible Linear Variable Optical Filter (LVOF) visible micro-spectrometer. The CMOS-compatible post process for fabrication of the LVOF has been used for integration of the LVOF with a CMOS chip containing a 128-element photodiode array and readout circuitry. Fabrication of LVOF involves a process for fabrication...conference paper 2010
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Van den Hout, M. (author), Hall, A.R. (author), Wu, M.Y. (author), Zandbergen, H.W. (author), Dekker, C. (author), Dekker, N.H. (author)Solid-state nanopores are considered a promising tool for the study of biological polymers such as DNA and RNA, due largely to their flexibility in size, potential in device integration and robustness. Here, we show that the precise shape of small nanopores (?5 nm diameter in 20 nm SiN membranes) can be controlled by using transmission electron...journal article 2010
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Golestani, R. (author), Wu, C. (author), Tio, R.A. (author), Zeebregts, C.J. (author), Petrov, A.D. (author), Beekman, F.J. (author), Dierckx, R.A.J.O. (author), Boersma, H.H. (author), Slart, R.H.J.A. (author)Preclinical cardiovascular research using noninvasive radionuclide and hybrid imaging systems has been extensively developed in recent years. Single photon emission computed tomography (SPECT) is based on the molecular tracer principle and is an established tool in noninvasive imaging. SPECT uses gamma cameras and collimators to form projection...journal article 2010
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Wu, H. (author), Grabarnik, S. (author), Emadi, A. (author), De Graaf, G. (author), Wolffenbuttel, R.F. (author)The spectral resolution of a MEMS-based IR microspectrometer critically depends on the thermal cross-talk between adjacent TE elements in the detector array. Thermal isolation between elements is realized by using bulk micromachining directly following CMOS processing. This paper reports on the characterization results of bridge-shaped TE...journal article 2009
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Wu, M. (author), De Weerdt, M.M. (author), La Poutré, H. (author)In this paper, we present an automated multi-agent multi-issue negotiation solution to solve a resource allocation problem. We use a multilateral negotiation model, by which three agents bid sequentially in consecutive rounds till some deadline. Two issues are bundled and negotiated concurrently, so win-win opportunities can be generated as...book chapter 2009
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Wu, R. (author), Makinwa, K.A.A. (author), Huijsing, J.H. (author)This paper presents a chopper instrumentation amplifier for interfacing precision thermistor bridges. For high CMRR and DC gain, the amplifier employs a three-stage current-feedback topology with nested-Miller compensation. By chopping both the input and intermediate stages of the amplifier, a 1 mHz 1/f noise corner was achieved at an input...journal article 2009
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- Wu, M. (author), De Weerdt, M.M. (author), La Poutré, H. (author), Yadati, C. (author), Zhang, Y. (author), Witteveen, C. (author) conference paper 2009
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Emadi, A. (author), Wu, H. (author), Grabarnik, S. (author), De Graaf, G. (author), Wolffenbuttel, R.F. (author)This paper reports on the IC-compatible fabrication of vertically tapered optical layers for use in linear variable optical filters (LVOF). The taper angle is fully defined by a mask design. Only one masked lithography step is required for defining strips in a photoresist with trenches etched therein of a density varying along the length of the...journal article 2009
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Chen, P. (author), Wu, M.Y. (author), Salemink, H.W.M. (author), Alkemade, P.F.A. (author)We report a new method for the fabrication of sub-10 nm nanopores in a fast single process step. The pore formation is accomplished by exploiting the competition between sputtering and deposition in ion-beam-induced deposition (IBID) on a thin membrane. The pore diameter can be controlled by adjusting the ion beam and gas exposure conditions....journal article 2008
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Wisselink, H.W. (author), Toirkens, M.J. (author), Wu, Q. (author), Pronk, J.T. (author), Van Maris, A.J.A. (author)Lignocellulosic feedstocks are thought to have great economic and environmental significance for future biotechnological production processes. For cost-effective and efficient industrial processes, complete and fast conversion of all sugars derived from these feedstocks is required. Hence, simultaneous or fast sequential fermentation of sugars...journal article 2008
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Grabarnik, S. (author), Emadi, A. (author), Wu, H. (author), De Graaf, G. (author), Wolffenbuttel, R.F. (author)A concept for a highly miniaturized spectrometer featuring a two-component design is presented. The first component is a planar chip that integrates an input slit and aberration-correcting diffraction grating with an image sensor and is fabricated using microelectromechanical systems (MEMS) technologies. Due to the fabrication in a simple MEMS...journal article 2008
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Wu, C. (author), Vastenhouw, B. (author), Van der Have, F. (author), Dierckx, R.A. (author), Beekman, F.J. (author)SPECT imaging with low dose or short acquisition time can lead to very noisy reconstructed images. With the USPECT-II system we study the effect of low-count scans, and 3D Gaussian blurring to suppress statistical errors. Three different groups of short-time cardiac rat scans were derived from a longtime scan. Images were reconstructed and then...conference paper 2008
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- Narasimha, C.Y. (author), Witteveen, C. (author), Zhang, Y. (author), Wu, M. (author), La Poutré, H. (author) conference paper 2008