Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"Impedance sensing"”.
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Advanced applications in wide-area impedance sensing
In this thesis a wide-area impedance sensor used in hyperspectral imaging for a wide variety of applications is presented. Building on previous work, this sensor is decoupled from fluorescent lamps and thus is used to passively detect independent sources such as fluorescent lamps and laptop control …
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Portable biomedical measurement devices: MoboSens and impedance sensing systems
… to perform the tests is called electrochemical sensing, ‘MoboSens’. It uses a smartphone as its sensing platform with an integrated plug-and-play microelectronic ionic sensor, and the whole package is connected through the audio jack on the smartphone. It is used to measure nitrate concentration …
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Smartphone acoustic impedance sensing based on additive sum mixing technique
We have developed a method to perform impedance measurement using general purpose smartphones that will not require the presence of external power source. The need for battery-less impedance sensing methods is greatly demanded given recent years’ advancements in impedance based sensing …
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Portable EIS and SERS sensing with flexible sensors
To debottleneck the core development of portable sensing, in this dissertation low-cost, highly sensitive sensors for impedance sensing and surface-enhanced Raman sensing have been designed and tested with mass-manufacturing ability. Starting from silicon-based through-hole impedance with a …
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Enhancing Robotic Manipulation of Liquid Using a Digitally Fabricated Intelligent Wearable Device
… through’ the container, leveraging electrical impedance sensing. We design and mount a digitally embroidered electrode array to a commercial robotic gripper. Coupled with a customized impedance sensing board, we collect data on liquid manipulation with a swept frequency sensing mode and a …
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Investigations into endothelial cell permeability and adherens junction disruption induced by Junín virus infection.
… as measured by electric cell-substrate impedance sensing (ECIS) and transwell assays. We also show that EC adherens junctions are disrupted during infection which may provide insight into the role of the endothelium in the pathogenesis of AHF and possibly other viral hemorrhagic fevers …
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A Microfluidic Device for Transfection of Mammalian Cells Using Adjustable Shear Stress
… of microfluidic valves to allow tunability, and impedance sensing for cell membrane damage analysis. We achieve (95±5)% cell viability and up to (68±5)% efficiency in transfecting 3T3 cells with DNA-sized molecules. In future stages, we intend to add the device onto an existing cell-encapsulation …
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Design, Fabrication, and Implementation of a Single-Cell Capture Chamber for a Microfluidic Impedance Sensor
… substrate to develop a microfluidic single-cell impedance sensor for cell diagnostics. The device was fabricated using photolithography to create a master mold which in turn will use soft lithography to create the PDMS components for constant device production. The commercial software, COMSOLTM …
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A universal miniaturized electrochemical sensing platform and its applications
… portable universal miniaturized electrochemical sensing platform, which integrates with a microelectronic sensor strip, that can perform various electrochemical and impedance sensing measurements. This sensing platform works as a miniaturized potentiostat that supports a number of potential …
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The Cx43 Carboxyl-Terminal Mimetic Peptide αCT1 Protects Endothelial Barrier Function in a ZO1 Binding-Competent Manner
… measurement, including Electric Cell-Substrate Impedance Sensing(ECIS), a TRITC-dextran transwell permeability assay, and a FITC-dextran cardiovascular leakage protocol involving Langendorff-perfused mouse hearts, αCT1 was found to protect the endothelium from thrombin-induced breakdown in …
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Extending the Senses of Ubiquitous Devices
… their original intent through side-channel sensing. While this technique offers innovative uses without altering hardware, the enhancements it provides are often modest. In contrast, incorporating new hardware can dramatically expand a device's capabilities but entails significant costs and …
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Bioimpedance spectroscopy of breast cancer cells: A microsystems approach
Bioimpedance presents a versatile, label-free means of monitoring biological cells and their responses to physical, chemical and biological stimuli. Breast cancer is the second most common type of cancer among women in the United States. Although significant progress has been made in diagnosis and …
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Repurposing the human immunodeficiency virus (HIV) integrase inhibitor raltegravir for the treatment of felid alphaherpesvirus 1 (FHV-1) ocular infection
… herpesviruses. Then, electric cell-substrate impedance sensing (ECIS) was evaluated as a novel methodology to study the replication kinetics of herpesviruses. It was also used to characterize a fluorescently labeled FHV-1, created using CRISPR/Cas9 genome. Next, it was found that raltegravir …
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Sculptured computational objects with smart and active computing materials
… electrodes, an empirical model of complex impedance sensing, and a definition of and test for the machine sewability and flexibility of yarns. These contributions are presented in three sections: 1) the supporting arguments, and philosophy of materiality and computation behind this work, 2) …
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Monitoring of Biodiesel Transesterification Process Using Impedance Measurement
… process monitoring using low frequency (15kHz) impedance sensing which is able to provide information regarding the progress of mass transfer and chemical reaction during biodiesel production. An interdigitated (ID) sensor has been used to monitoring the biodiesel process The ID sensor is of …
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AI Assisted Cellular and 3D Spheroid Analyses for Combined Therapies Against Glioblastoma
… were validated by Electric Cell-Substrate Impedance Sensing at 48 hours: combination therapies showed the lowest cell migration (normalized resistance 0.7-0.8) compared to radiation alone (1.6), confirming that morphological clustering patterns correspond to real functional differences For …
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Bioparticle capture and sensing utilizing nanograss based microfluidic devices
… very attractive candidate for an electrochemical impedance spectroscopy (EIS) based biosensor. Such a sensing device is expected to perform direct sensing quickly with high sensitivity, and at low cost. In this work, the nanograss fabrication process is illustrated in detail. Then nanograss …
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Development of Immune Modulators Targeting Autoimmune Disorders and Pulmonary Injury: Design, Synthesis, and Biological Evaluation of Sphingolipid-Derived Sphingosine-1 Phosphate Receptor 1 Agonists
… have been subjected to electric cell–substrate impedance sensing experiments as agonism on the target receptor causes cellular barrier enhancement, resulting in quantitative measurability of the analogs’ potency. Those meta drugs that displayed promising effects in vitro have been then used for …
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An electrical microcytometer for portable blood analysis in global health applications
… a microfludic biochip, which uses electrical impedance sensing to analyze small sample volumes (~10 µL) of blood. The biochip progressively gains more functionality during the study. First, a chip was designed to confirm that the electrical impedance pulse counting technique was a viable …
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