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 75 for “"PPG"”.
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Single-site, noninvasive, blood pressure measurements at the ear using ballistocardiogram (BCG), and photoplethysmogram (PPG), and a low-power, reflectance-mode PPG SoC
… electrocardiogram (ECG), and photoplethysmogram (PPG) to extract mean blood pressure up the Carotid Artery. Being a natural anchoring point, the ear is demonstrated as a viable location for the integrated sensing of physiological signals. The BCG is obtained with an accelerometer, the ECG is taken …
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An algorithm for extracting the PPG Baseline Drift in real-time
Photoplethysmography is an optical technique for measuring the perfusion of blood in skin and tissue arterial vessels. Due to its simplicity, accessibility and abundance of information on an individual’s cardiovascular system, it has been a pervasive topic of research within recent years. With …
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Investigation and characterization of a high energy piezoelectric pulse
… a high energy piezoelectric pulse generator (PPG) constructed from commercially available piezoelectric materials. The high energy PPG converts mechanical energy into electrical energy, storing that energy in its internal capacitance. The energy storage of the high energy PPG developed here is …
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Design and development of a low cost heart best monitor device using finger photoplethysmography technique :|bcircuit design and fabrication of a non-invasive heart beat monitoring device that employs reflectance and transmission mode photoplethysmography using parallel port interface and microcontroller PIC16F84A.
… research is to achieve a strong and accurate PPG signal and simultaneously minimizing physiological artefacts and interference. In order to achieve the aim and objectives of the research, this thesis thoroughly explores two new signal conditioning hardware designs. Firstly is the design and …
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Physico-chemical properties of polypropylene glycols
Poly(propylene glycol) (PPG) samples of different molecular mass were characterized using differential scanning calorimetry, modulated differential scanning calorimetry, thermogravimetry and thermally stimulated current (TSC) spectroscopy. It was shown, by TSC, that the glass transition temperature …
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Roteiro de pesquisa e organização no Zotero: um guia prático a partir da temática antirracista
… (D) de 10 Programas de PósGraduação (PPG): no Instituto de Filosofia e Ciências Sociais (IFCS), o PPG em Sociologia e Antropologia, o PPG em História Comparada e o PPG em História Social; no Museu Nacional (MN), o PPG em Antropologia Social; no Instituto de Pesquisa e Planejamento …
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Reflectance photoplethysmography for non-invasive monitoring of tissue perfusion
… over the decades. Photoplethysmography (PPG) is an optical technique that measures blood volume variations in vascular tissue and it is well known for its utilisation in pulse oximetry for the estimation of arterial blood oxygen saturation (SpO2). In pulse oximetry, mainly the pulsatile …
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Plugging performance of preformed particle gels in fractures and its influencing factors
"Preformed particle gels (PPG) has been successfully applied to combat the water channeling caused by fractures or fracture-like channels. Understanding the placement and plugging of PPG in fractures is crucial for gel treatment design. The objective of the dissertation is to explore the plugging …
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A Robust Algorithm for Identification of Motion Artifacts in Photoplethysmography Signals
Photoplethysmography(PPG) is commonly used as a means of continuous health monitoring. Many clinically relevant parameters like heart rate (HR), blood oxygenaton level (SPO2) are derived from the sensor measurements using PPG. Presence of motion artifacts in the signal decreases the accuracy of …
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Tailored Architectures of Ammonium Ionenes
… segment (HS) content, poly(propylene glycol) (PPG)-based ammonium ionenes were synthesized using a Menshutkin reaction from bromine end-capped PPG oligomers (prepared using acid-chloride reactions) and N,N,Nâ ²,Nâ ²-tetramethyl-1,6-hexanediamine. Matrix assisted laser desorption ionization-time …
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Optical sensors for the in vivo assessment of flap perfusion in plastic surgery
… three wavelength photoplethysmographic (PPG) sensor was developed. The PPG sensor consisted of two infrared (940 nm), two green (520 nm) and two red (660 nm) LEDs and a photodiode. A PPG processing system was also constructed in order to drive the optical components on the sensor and to …
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In vivo investigations of photoplethysmograms and arterial oxygen saturation from the auditory canal in conditions of compromised peripheral perfusion
… rely on the technique of photoplethysmography (PPG) to estimate arterial oxygen saturation (SpO2). In conditions of poor peripheral perfusion such as hypotension, hypothermia, and vasoconstriction, the PPG signals detected are often small and noisy, or in some cases unobtainable. Hence, pulse …
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Targeting Mitochondrial Proline Dehydrogenase (PRODH) with a Suicide Inhibitor as a Novel Anticancer Strategy
… acid, 5-oxo) and irreversible/suicide (PPG) inhibitors of PRODH using cultured human breast cancer cells. PRODH knockdown or enzymatic inhibition each inhibited cell growth and induced variable degrees of apoptosis against malignant breast epithelial cell lines (ZR-75-1, DU4475, MCF-7) …
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Photoplethysmorgraph-derived respiration
… respiratory rate using the photoplethysmograph (PPG) signal is rapidly growing. The main objectives of the thesis is to design a PPG hardware an ear clip sensor and analog processing circuit -- to comprise respiration related information and build a software using autoregressive modeling …
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Investigations of photoplethysmography in the assessment of haemodynamics, vascular mechanics and haemorheology
… for the first time that Photoplethysmography (PPG) has the potential to non‐invasively assess, in a qualifying and quantifying manner, the above parameters. Positives outcomes from such approach will establish the potential of the PPG as a preferential monitoring (screening and possible …
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Interaction of Metal Salts with Polyethers
… mercuric chloride and poly(propylene glycol) (PPG). Other salt-poly-ether combinations have also been considered such as cobalt chloride-PPG cadmium chloride-PPG zinc chloride-PPG and ferric chloride-PEG (polyethylene glycol). Some of this work was also supported by chemical shift and …
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Detecting Human Memory Processes via Bio-Signals
… such as eye movement data, photoplethysmography (PPG), and electrodermal activity (EDA), can provide insight into various cognitive states. Previous work has shown that eye movements along with other bio-signals differ when viewing familiar versus unfamiliar faces. Signals such as heart rate …
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Unterdrückung von Bewegungsartefakten beim Langzeitmonitoring zur Anwendung in Personal-Healthcare-Systemen
… (EKG) sowie des Photoplethysmogramms (PPG) und der Sauerstoffsättigung entwickelt, die in ein Body-Sensor-Network eingebunden sind. Ein auf IEEE 802.15.4 basierendes entwickeltes proprietäres Protokoll ermöglicht die drahtlose energieeffiziente Datenübertragung zwischen den …
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Investigation of splanchnic perfusion utilising an intraluminal opto-electronic sensor placed in the duodenum
… of two probes: an existing miniaturised PPG probe intended for intraluminal use and optically- identical finger PPG probe. Nine anaesthetised patients undergoing elective open laparotomy surgery were recruited and consented for the clinical trial at The Royal London Hospital. Due to the …
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Motion artifact cancellation for wearable photoplethysmographic sensor
Photoplethysmography (PPG) is a non-invasive and unobtrusive technique to measure heart rate from the surface of the skin, by exposing a section of the skin to an LED light and measuring the changes in reflected light due to the blood pulsing through under the skin. However, PPG signals are highly …
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