Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
This paper presents four droplet operations (creating, transporting, splitting and merging of droplets) actuated by dielectrowetting (not electrowetting), which fundamentally constitute a backbone of droplet-based digital microfluidics. These operations are successfully achieved for both non-conductive (dielectric) and conductive (DI water with/without surfactant) fluids in an open environment on...
This paper describes a smart cantilever device to precisely monitor the drug-induced contraction forces of cardiac muscle cells. The cantilever device is composed of two parallel microelectrodes and 3D micro-patterns on the surface. The microelectrodes are utilized to synchronize beating of individual cell during drug screening experiments. These also enhance the expression of connexin 43 (Cx-43)...
This paper reports an improved-sensitivity resonant accelerometer with fishbone-shaped resonators of higher vibration modes. Different from conventional resonant accelerometer integrating with low-order vibrating resonators, our prototype utilizes higher-mode fishbone-shaped resonators based on the principle that higher vibration modes have a higher frequency sensitivity. The proposed fishbone-shaped...
This work presents an electrostatically tunable MEMS rotational acceleration switch and its operation as a 3-bit digital rotational accelerometer. The concept of operating electrostatically tunable acceleration switches as digital MEMS accelerometers, as previously demonstrated, has been applied to rotational acceleration switches in this work leading to an ultra-low power potential alternative to...
The bulk of current research in the realm of pico air vehicles has focused on biologically inspired propulsion mechanisms. In this work we investigate the use of electrohydrodynamic thrust produced by a microfabricated corona discharge device as a mechanism to create flying microrobots with no moving parts. Electrodes of various geometries are fabricated from a silicon-on-insulator wafer with a two...
A design of flexible piezoelectric strain energy harvester responsive to multi-directional forces from arbitrary human motions was developed by using polydimethylsiloxane (PDMS) and polyvinylidene fluoride (PVDF). Unlike the most of conventional strain energy harvesters designed to be functional only for single directional motion, our suggested design demonstrated the energy harvesting capability...
This paper reports a novel bioMEMS device that integrates mechanical constriction for single cell trap in the channels, which are enclosed by thick (or 3D) C-PDMS (carbon-black-PDMS) electrodes and bottom planar transparent electrode for dielectrophoretic (DEP) cell manipulation. Leveraging hydrodynamics and dieletrophoresis, this simple biomedical microsystem enables more efficient loading of one...
This paper reports a low voltage DC digital microfluidics device working in air filler by inducing lateral electric field (ILEF), which enables manipulation of various positively charged and negatively charged polar solutions for biomedical applications in an oil-free digital microfluidic platform while using cheap DC electric power source. Sensitivity of threshold voltage (minimum required voltage...
A mechanical circuit has been demonstrated that harnesses squegging to convert −50dBm of input continuous-wave (CW) energy into a local 1-kHz clock output while consuming three orders less local battery power than a typical real-time clock (RTC). Unlike a previous clock receiver that relied on a modulated RF input, this clock generator converts a CW input — no modulation needed — to a clock output...
In this paper a model for the capacitive ultrasonic transducer is described. The main element of the transducer is a metalized silicon nitride membrane suspended on a rigid support above a heavily doped silicon bulk. The model developed in the project is based on the lumped parameter representation of the membrane, is easy to characterize, and is suitable for small and large signal analyses.
The radio frequency microelectromechanical systems (RF MEMS) based switch experiences pull-in instability due to electrostatic actuation mechanism. The switch actuating element is thin parallel plate capacitor electrodes separated by air gap and dielectric material. This paper simulates the RF MEMS switch in MATLAB software to evaluate its performance in terms of pull-in voltage and displacement at...
This paper presents a new feature extraction algorithm for the challenging problem of the classification of myoelectric signals for prostheses control. The algorithm employs the orientation between a set of descriptors of muscular activities and a nonlinearly mapped version of them. It incorporates information about the Electromyogram (EMG) signal power spectrum characteristics derived from each analysis...
In this work we describe the effect of Dielectrophoresis (DEP) on the deformation of red blood cells by measuring the change in aspect ratio. The force induced through DEP will act against the elastic force of the cell, lengthening and slimming the cell. The change in dimensions due to deformation under DEP is measured under a microscope, and when compared to DEP force applied, can provide useful...
In this paper, a simple method for cell dipping in a microfluidic device using dielectrophoresis is presented. A microfluidic system includes glass substrate and PDMS element is fabricated and tested. Cells dipping is performed and achieved using two sets of electrodes that slightly protrude into the microchannel through the sidewalls. The fabrication process and testing of the device are detailed.
An Electro-hydrodynamic (EHD) thruster is a static device that employs electro-hydrodynamic phenomenon to produce thrust in the air. It generates net vertical force from electrostatic field. It consists of two parallel conducting electrodes, one in the form of a fine wire and the other in the form of a foil skirt. When a very high potential difference is applied, it generates a uniform electric field...
A wall climbing robot with crawler type, using electrostatic adhesion pads (EAP), which enables strong adaptability to wide range of wall surfaces, relatively light weight, simple structure and low power consumption, has been proposed in this paper. Firstly, the principle of the electrostatic adhesion and the equivalent calculation of adhesion force are presented. Secondly, the robot quasi-static...
Electrotactile stimulation has been used to provide sensory information of forearm prosthesis to users. Although conventional sensory feedback method, where one electrode expresses sensory information of only one finger, could provide force information of three fingers by using three electrodes, it showed less cognitive accuracy when more than two electrodes were stimulated simultaneously compared...
This paper introduces a new robotic gripper for flat surfaces based on a novel electrostatic/gecko-like adhesive. This unique gripping solution overcomes the shortcomings of vacuum grippers for part-handling by eliminating the need for a compressed air system and offering more rapid actuation, thus achieving significant potential cost savings and throughput improvements in manufacturing processes...
This paper aims to develop novel surgical forceps integrated with a three-axis force sensor for robot-assisted minimally invasive surgery (RMIS). To detect accurate force sensing, a force sensing system is integrated to a gripper of a surgical instrument. At the gripper side, two possible locations are considered, and the sensing system is installed to the distal region of the gripper, which gives...
The platinum pin-type electrodes are installed in inner water cooling circuits of HVDC converter valves to grade the electrical potential distribution and to protect metal components from electrolytic corrosion. In practice, the inorganic particles such as aluminum compounds in cooling water dielectric would be transported to the surfaces of pin-type grading electrodes and aggregate the inorganic...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.