Wyniki wyszukiwania dla: Michael Kraft

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Single‐Crystal Capacitive Sensors with Micropatterned Electrodes via Space‐Confined Growth of the Metal–Organic Framework HKUST‐1 (Adv. Funct. Mater. 36/2022)

Benzheng Xia, Aleksander Matavž, Min Tu, Víctor Rubio‐Giménez, więcej

Advanced Functional Materials > 32 > 36 > n/a - n/a

Single‐Crystal Capacitive Sensors In article number 2204065, Min Tu, Rob Ameloot, and co‐workers develop a space‐confined synthesis method to fabricate surface‐embossed micropatterns and surface‐embedded gold electrodes on metal–organic framework single crystals. A capacitive gas sensor is constructed by embedding Au electrodes on HKUST‐1 flat single crystals and is used for the investigation of...

artykuł

Single‐Crystal Capacitive Sensors with Micropatterned Electrodes via Space‐Confined Growth of the Metal–Organic Framework HKUST‐1

Benzheng Xia, Aleksander Matavž, Min Tu, Víctor Rubio‐Giménez, więcej

Advanced Functional Materials > 32 > 36 > n/a - n/a

The polyhedral shape and fragile nature of single crystals of metal–organic frameworks (MOFs) hinder their processing using standard microfabrication techniques. As a result, the fabrication of surface patterns and microelectrodes on MOF single crystals is challenging, which limits both the direct electrical interrogation of crystals in research and their integration into optical and electrical devices...

artykuł

Flexible Metal Halide Perovskite Photodetector Arrays via Photolithography and Dry Lift‐Off Patterning

Benzheng Xia, Min Tu, Bapi Pradhan, Frederik Ceyssens, więcej

Advanced Engineering Materials > 24 > 1 > n/a - n/a

Metal halide perovskites draw increasing attention as photodetector materials due to their strong visible light absorption and resulting photocurrent. The development of efficient fabrication routes to realize high‐resolution perovskite pixel arrays is critical to enable practical devices. Herein, a dry lift‐off process to fabricate methylammonium lead iodide (MAPbI₃) pixels on different substrates...

artykuł

Numerical modeling of two microwave sensors for biomedical applications

Xiue Bao, Giovanni Crupi, Ilja Ocket, Juncheng Bao, więcej

International Journal of Numerical Modelling: Electronic Networks, Devices... > 34 > 1 > n/a - n/a

The purpose of this invited paper is to give readers a critical and comprehensive overview on how to extract dielectric properties of a bioliquid within a broad frequency range. Two sensors are used in the paper to characterize saline solutions by measuring the broadband complex permittivity. The two sensors are based on transmission line and interdigital electrodes designed for low‐ and high‐ frequency...

artykuł

Wideband RF MEMS switch using two dimensional actuations

Hassan Saffari, Reza Askari Moghadam, Michael Kraft

Analog Integrated Circuits and Signal Processing > 2019 > 100 > 2 > 369-376

In this paper, a new wideband RF MEMS switch using lateral and vertical actuations has been proposed which can be used for wide frequency band. The switch consists of one side clamped bridge and two electrostatic actuators array which move the bridge laterally. There is also one vertical electrostatic actuator which moves the bridge up and down. This actuation voltage is equal to 15 V. A flexible...

artykuł

Design and experiment of an electromagnetic levitation system for a micro mirror

Qijun Xiao, Yuan Wang, Samuel Dricot, Michael Kraft

Microsystem Technologies > 2019 > 25 > 8 > 3119-3128

In this paper, the design and characterization of a contactless electromagnetic levitation and electrostatic driven microsystem is presented, which has applications for example for large scale angle rotation micro mirrors. The proposed design can levitate a fabricated aluminum micro rotor which can incorporate a mirror and control it to rotate around the vertical axis within the range of ± 180°, which...

artykuł

Rückgewinnung von CaCO₃ aus dem Nephelinschlamm der Aluminiumoxidproduktion

Olga O. Kononchuk, Maria V. Goncharova, Sebastian Hippmann, Michael Kraft, więcej

Chemie Ingenieur Technik > 91 > 4 > 494 - 501

Bei der Produktion von Aluminiumoxid aus dem Na‐Aluminiumsilikat Nephelin fallen trotz einer integrierten Prozessführung große Reststoffmengen an, die der Deponierung zugeführt werden müssen. Mithilfe einer Rückgewinnung von Pirssonit, ist es möglich, aus dem anfallenden Nephelinschlamm Calciumcarbonat und Kieselsäurehydrogel zu gewinnen und so das Schlammaufkommen erheblich zu reduzieren. Das zurückgewonnene...

artykuł

A mass sensor based on 3-DOF mode localized coupled resonator under atmospheric pressure

Yuan Wang, Chun Zhao, Chen Wang, Delphine Cerica, więcej

Sensors and Actuators A: Physical > 2018 > 279 > C > 254-262

In this paper, for the first time, the mass sensitivity of a 3-DoF mode localized electrostatically coupled resonator is investigated and characterized under atmospheric pressure. A reversible method is used in which nanoparticles are added on and removed from one resonator of the 3-DOF coupled resonator system. Furthermore, a comparison of three mass sensitivity characterization methods was carried...

artykuł

Methanol Synthesis by CO₂ Hydrogenation over Cu/ZnO/Al₂O₃ Catalysts under Fluctuating Conditions

Alexander Zurbel, Michael Kraft, Sena Kavurucu‐Schubert, Martin Bertau

Chemie Ingenieur Technik > 90 > 5 > 721 - 724

Methanol synthesis through CO₂ hydrogenation under fluctuating conditions was investigated over a CuO/ZnO/Al₂O₃ catalyst in an integral reactor. The performance of the catalyst was examined under stable conditions at 563 K and 80 bar. For dynamic experiments, the H₂/CO₂ ratio of the feed gas was changed sequentially. Although the activity and selectivity towards methanol of the catalyst was affected...

artykuł

Comparison of virtual monochromatic series, iodine overlay maps, and single energy CT equivalent images in head and neck cancer conspicuity

Michael Kraft, Mohannad Ibrahim, Matthew Spector, Reza Forghani, więcej

Clinical Imaging > 2018 > 48 > C > 26-31

To compare lesion conspicuity amongst DECT monochromatic series (40, 45, 50keV), and single-energy CT (SECT) equivalent images in head and neck squamous cell carcinomas (HNSCC).Two readers compared DECT images to 70keV SECT equivalent series in 39 patients with HNSCC on lesion margin, enhancement, and overall conspicuity.The 45keV and 50keV images were significantly better (p-values ≤0.001) than the...

rozdział

A high precision MEMS based capacitive accelerometer for seismic measurements

Alexander Utz, Christian Walk, Alexander Stanitzki, Mir Mokhtari, więcej

2017 IEEE SENSORS > 1 - 3

2017 IEEE SENSORS

In this paper, we present a capacitive, MEMS based accelerometer comprising an ultra-low noise CMOS integrated readout-IC and a high precision bulk micro machined sensing element. The resulting accelerometer reaches an acceleration equivalent noise of only 200 ng/fHz, which makes it suitable for seismic measurement that require noise levels significantly below 1 pgAjHz. The design of the sensing element...

rozdział

A front-side non-soi fabricated tri-axis capacitive accelerometer with electromechanical sigma-delta modulators interface

Fang Chen, Yi Zhao, Hongshuo Zou, Michael Kraft, więcej

2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS) > 930 - 933

2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS)

This paper presents a novel front-side non-SOI fabricated tri-axis capacitive accelerometer with a dual quantization electromechanical sigma-delta modulator (EM-ΣΔΜ) interface. It can be used for realizing monolithic inertial microsystem units. The 2.6mm×2.6mm sized tri-axis accelerometer is designed and fabricated with a high-yield bulk-micromachining fabrication process using only front-side etching...

artykuł

Study of enzyme sensors with wide, adjustable measurement ranges for in-situ monitoring of biotechnological processes

Stefan Mross, Tom Zimmermann, Sebastian Zenzes, Michael Kraft, więcej

Sensors and Actuators B: Chemical > 2017 > 241 > C > 48-54

We report on a study of enzymatic glucose and lactate sensors for measurements of wide concentration ranges from 1mM up to 600mM and 900mM, respectively, in biotechnological processes. Diffusion-limiting polyurethane membranes were used to extend the linear measurement range and the influence of two fabrication parameters on membrane properties and sensor performance evaluated. The polymer concentration...

rozdział

Parametric reduced order models in static multiphysics analysis of MEMS switches

Aurel Sorin Lup, Gabriela Ciuprina, Daniel Ioan, Anton Duca, więcej

2017 10th International Symposium on Advanced Topics in Electrical Engineering (ATEE) > 513 - 518

2017 10th International Symposium on Advanced Topics in Electrical Engineering (ATEE)

This contribution proposes a method to extract parametric reduced models that describe the coupled structural-electric behavior of RF MEMS switches. The equivalent capacitance coefficients and the effective elastic coefficients are extracted from coupled structural-electrostatic analysis. Parametric models are built based on the sensitivities of the extracted equivalent coefficients. The method is...

artykuł

An Investigation of Structural Dimension Variation in Electrostatically Coupled MEMS Resonator Pairs Using Mode Localization

Graham S. Wood, Chun Zhao, Suan Hui Pu, Ibrahim Sari, więcej

IEEE Sensors Journal > 2016 > 16 > 24 > 8722 - 8730

If a pair of MEMS resonators is electrostatically coupled together, the vibration amplitude ratios at the resonant frequencies of the resulting coupled system are sensitive to stiffness perturbation. An imbalance between the two resonators causes the confinement of vibration energy when the system is resonating, an effect known as mode localization. The degree of localization can be determined by...

artykuł

Integrated multi-sensor system for parallel in-situ monitoring of cell nutrients, metabolites, cell density and pH in biotechnological processes

Stefan Mross, Tom Zimmermann, Nadine Winkin, Michael Kraft, więcej

Sensors and Actuators B: Chemical > 2016 > 236 > C > 937-946

We report on a multi-sensor system for the parallel in-situ monitoring of cell nutrients, metabolites, cell density and pH in biotechnological processes. The fabrication process of the sensor chip, based on a CMOS process flow, is suitable for integration into standard processes and mass production of the system. The integration of enzyme sensors for wide concentration ranges, an impedance-based sensor...

artykuł

Droplet formation by squeezing in a microfluidic cross-junction

Stéphanie van Loo, Serguei Stoukatch, Michael Kraft, Tristan Gilet

Microfluidics and Nanofluidics > 2016 > 20 > 10 > 1-12

In microfluidics, flow focusing is widely used to produce water-in-oil droplets in microchannels at high frequency. We here report an experimental study of droplet formation in a microfluidic cross-junction with a minimum number of geometrical parameters. We mostly focus on the squeezing regime, which is composed of two distinct steps: filling and pinching. The duration of each step (and corresponding...

artykuł

A review on coupled MEMS resonators for sensing applications utilizing mode localization

Chun Zhao, Mohammad H. Montaseri, Graham S. Wood, Suan Hui Pu, więcej

Sensors and Actuators A: Physical > 2016 > 249 > C > 93-111

In this paper, we review a recent technology development based on coupled MEMS resonators that has the potential of fundamentally transforming MEMS resonant sensors. Conventionally MEMS resonant sensors use only a single resonator as the sensing element, and the output of the sensor is typically a frequency shift caused by the external stimulus altering the mechanical properties, i.e. the mass or...

artykuł

Mechanically coupled ring-resonator filter and array (analytical and finite element model)

Vinayak Pachkawade, Rajesh Junghare, Rajendra Patrikar, Michael Kraft

IET Computers & Digital Techniques > 2016 > 10 > 5 > 261 - 267

In this paper, a design of two microelectromechanical systems based devices is carried out using an analytical and finite-element analysis. The first device is mechanically coupled ring-resonator band-pass filter with centre frequency of 4.4 MHz and a small bandwidth of only 36 kHz. Flexural-mode ring resonators have been mechanically coupled using soft mechanical spring for realising the filtering...

artykuł

Electromechanical Sigma–Delta Modulators ( $\Sigma \Delta {\mathrm{ M}}$ ) Force Feedback Interfaces for Capacitive MEMS Inertial Sensors: A Review

Fang Chen, Xinxin Li, Michael Kraft

IEEE Sensors Journal > 2016 > 16 > 17 > 6476 - 6495

Analog-to-digital converters based on sigma–delta modulators (

$\Sigma \Delta {\mathrm{ M}}$

) are a popular choice for high resolution conversion from the analog to the digital domain. With relatively small modifications, they can also be used as electromechanical

$\Sigma \Delta {\mathrm{ M}}$

(EM-

$\Sigma \Delta {\mathrm{ M}}$

) force feedback interfaces for capacitive micro-electromechanical...

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