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 35 for “"pH sensor"”.
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Marine Applications of an Autonomous Indicator-Based pH Sensor
<p> Currently, the lack of accurate in situ pH measurements limits our understanding of natural pH variability. In order to predict future pH changes in the oceans, quality high temporal resolution pH data are needed. This work used the newly developed Submersible Autonomous Moored Instrument for …
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Marine Applications of an Autonomous Indicator-Based pH Sensor
<p> Currently, the lack of accurate in situ pH measurements limits our understanding of natural pH variability. In order to predict future pH changes in the oceans, quality high temporal resolution pH data are needed. This work used the newly developed Submersible Autonomous Moored Instrument for …
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Silicon-based pH sensor for biological and environmental applications
… hydrogen and hydroxyl ion concentrations (pH levels). Conventionally, the measurement processes take a considerable amount of time involving several calibration steps and handling of fragile electrodes. Here we propose a new, more robust and theoretically reliable way of sensing pH. …
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Investigation and development of titanium nitride solid-state potentiometric pH sensor
The measurement of pH value is crucial parameter in various fields like, drinking water monitoring, food preparation, biomedical and environmental applications. The most common device for pH sensing is the conventional pH glass electrode. While glass electrodes have several advantages, such as …
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Development, manufacture and application of a solid-state pH sensor using ruthenium oxide
The measurement of pH is undertaken frequently in numerous settings for many applications. The common glass pH probe is almost ideal for measuring pH, and as such, it is used almost ubiquitously. However, glass is not ideal for all applications due to its relatively large size, fragility, need for …
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Investigation on Ultra-miniature and Ultra-low-power Non-invasive CMOS pH Sensor for Intracellular Monitoring
… compact solution for miniaturized noninvasive pH sensors. Existing solutions to intracellular sensing are mainly through invasive approaches, which will likely damage the target cell. However, learning what is going on inside the cell while keeping the cell alive and safe is highly demanded. …
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Responses to Antifungal and Alkaline pH Stress in Human Fungal Pathogens
… neoformans.</p><p>An alteration in extracellular pH is another one of the predictable changes that C. neoformans encounters in its shift from its environmental niche to the human host. This environmental increase in pH is internalized into microbial cells through the fungal-specific Rim signal …
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Power consumption and costing of crop sensing systems for monitoring common Western Cape crops growth
… farmers. The power consumed by the temperature sensor, pH sensor, and soil moisture during different stages of growth were investigated. Among the considered crops, spinach growth monitoring consumed the least amount of power during monitoring. The highest amount of power was consumed during …
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Design, Fabrication, and Test of Chaotic Micromixers, Hydrogel Microvalves and pH Regulation Systems
… designed to provide self regulation of pH in bioassays are demonstrated. The first system is based on the counterflow microdialysis principle, whereas the second system involves direct addition of an acidic or basic buffer solution into a sample solution. In both systems, a hydrogel …
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Quantitative methods for in vitro and in vivo characterization of cell and tissue metabolism
… Metrics for metabolism span tissue oxygen and pH levels and cellular thermal output. This need is present in research and clinical applications both of which are underserved by existing technologies. This thesis presents the development of three distinct technologies: an implantable oxygen …
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Carbon Nanotube-Based Wearable Sweat Sensors; Design and Fabrication
Wearable sweat sensors enable non-invasive diagnosis of various diseases and real-time health monitoring. Few sensors exhibit pH measurement on skin due to interference by sodium chloride ions. This thesis presents a multiplexing wearable sweat sensor using single and multi-walled carbon nanotubes. …
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Decoding Gating Properties of the Pannexin1 Channel: ATP Release and pH Sensitivity and the Potential Role in Health and Disease
… epilepsy and ischemia, with roles in important physiological processes including learning, memory and sensory function. In sensory systems, ATP release and purinergic signaling is considered the most important function of Panx1. Here, the function in the olfactory epithelium was investigated …
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Design, Synthesis, And Luminescence Properties Of Bridged Dimetallic Lanthanide Coordination Compounds
… Eu3+- and Tb3+-containing complexes. Solution-phase luminescence measurements and density functional theory (DFT)-optimized structures indicated that all complexes were nearly isostructural and contained a dimetallic lanthanide core bridged by three oxygen atoms that are covalently bound to the …
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Compact Optical Sensing Systems for pH and Other Substances Detection - Theory and Implementation
… of importance in research and industry. Optical sensors based on contact imaging realize the chemical detection in compact, efficient and inexpensive ways. In the first project real-time optical pH sensor based on complementary metal–oxide–semiconductor (CMOS) contact imaging and microfluidics, …
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Wirelessly Powered Sensor Design with On-Chip Antenna in CMOS Technology
… growth of the Internet of Things (IoT), wireless sensor network (WSN) and bio-implantable devices. There are 7 billion of IoT devices in use in 2018, which starts to surpass the number of the mobile devices. To extend the next level of connectivity from smart phone or tablet to each of the …
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Development and Characterisation of a Carbon Based pH Microsensor and Studies on Polypyrrole Nanowires
… of polypyrrole (PPy) into nanowire and bulk morphologies is reported. The electrochemical properties of the different conformations of PPy were examined in order to ascertain their conductivities and surface areas. This could determine the optimisation for further modification of the polymer …
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Development of new photoluminescent sensing materials, systems and applications for cell analysis
Cell analysis using optochemical sensors represents large and important niche in life and biomedical science. Sensor calibration and detection platforms are critical during sensor fabrication, characterization and application. However, existing calibration setups, platforms, and systems have …
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Novel Electrochemical Methods for Acidity Monitoring: Theory, Design and Application
… the design and development of novel voltammetric pH sensors for buffered, low-buffered and unbuffered media. pH sensors in stagnant and hydrodynamic environments were designed and developed for performing measurements using square wave voltammetry. Chapter 1 introduces the motivation of this …
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Advanced analytical strategies to determine biomedical parameters for medical diagnostics, drug delivery, and therapy
… development and applications: 1) detection of pH changes caused by nanotoxicity (induced by TiO<sub>2</sub> nanoparticles) using newly developed micro-pH sensor, 2) quantification of renal cell carcinoma (RCC) biomarkers by high-performance liquid chromatography - tandem mass spectrometry …
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Long Period Grating-Based pH Sensors for Corrosion Monitoring
… fabricate and test optical fiber-based chemical sensors for monitoring corrosion from early stages through the entire corrosion event. Although there are several preventative methods under development to address the problem of corrosion degradation, new techniques are still needed that are …
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