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 47 for “"PEF"”.
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Determining the mechanism of pulsed electric field for improving meat quality : A thesis submitted in partial fulfilment of the requirements for the Degree of Doctor of Philosophy at Lincoln University
Pulsed electric field (PEF) is a novel non-thermal technology that has recently attracted the attention of meat scientists and technologists due to its ability to modify membrane structure and enhance mass transfer. Several studies have confirmed the potential of PEF for improving meat tenderness …
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Pulsed electric field treatment of Arthrospira platensis and Saccharomyces cerevisiae
Pulsed electric field (PEF) can induce irreversible electroporation in the bio-membrane and cause the death of microbial cells without significant thermal effect, which can be used for inactivation of microorganisms and facilitation lysis of microbial cells for lipid extraction. The present study …
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Pre-equalization for pre-Rake MISO DS-UWB systems
… detection. The first pre-equalization filter (PEF) scheme employs one PEF per transmit antenna, whereas in the second, simplified PEF (S-PEF) scheme all transmit antennas share the same PEF. For both schemes the optimum finite impulse response (FIR) and infinite impulse response (IIR) PEFs are …
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Pulse electric field exposure effect on morphological properties of HeLa cells
… with the investigation of pulsed electric field (PEF) towards biological cells. Biological cells selected in this study are HeLa (cervical cancer) cells. There are two parts of the study, which was involving modeling methods and experimental setup. Modeling method used involves analytical (MATLAB) …
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Pulsed electric field induced stress in plant systems
… Felder (engl. Pulsed electric fields PEF) in der Nach-Ernte Lagerung untersucht. Veränderungen im Gesamtpolyphenolgehalt, in der Aktivität und Konzentration ausgewählter Enzyme sowie der Einfluss auf die Permeabilisierung von Zellmembranen wurden in der Reaktionszeit nach …
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Development and validation of a diagnostic tool for occupational asthma based on serial lung function measurements
Serial peak expiratory flow measurements (PEF) are recommended as an initial investigation in the confirmation of occupational asthma. Plotting measurements in Oasys gives reproducible results and can be used by non-experts. I report a new analysis, the area between curves (ABC) score, which gives …
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Investigation of yeast cell responses to pulsed electric field treatment /
… to 10 %. Irreversible damage after exposure to PEF was detected in the plasma membrane, but not in a cell wall, while both structures' integrity stabilized within 100 seconds. For the very first-time yeast-modified electrodes were successfully used to investigate electroporation of the same …
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Tratamiento del tabaquismo en personas con trastorno por uso de sustancias
… combinación con el pensamiento episódico futuro (PEF); 3) analizar el efecto aditivo a corto plazo del MC comparado con la TCC + PEF sobre la abstinencia tabáquica y otras variables relevantes en el tratamiento, como es la retención, la asistencia a las sesiones y la adherencia a las pautas de …
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Computational and Experimental Investigation of the Critical Behavior Observed in Cell Signaling Related to Electrically Perturbed Lipid Systems
… Statement: The use of pulsed electric fields (PEFs) as a tumor treatment modality is receiving increased traction. A typical clinical procedure involves insertion of a pair of electrodes into the tumor and administration of PEFs (amplitude: ~1 kV/cm; pulse-width: 100 μs). This leaves a zone of …
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Pulsed electric field pretreatment of lignocellulose biomass for maximum fermentable sugar yield
… generation. Pulsed electric field pretreatment (PEF) has emerged as a promising method thought to enhance biomass permeability. In this particular study, a PEF pretreatment system was designed, simulated, constructed, and tested specifically for treating flax straw. This system has the capacity …
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Beziehung zwischen nasaler Entzündung und bronchialer Hyperreaktivität bei Kindern
… (LUFU), einwöchigen Peak-Flow-Messungen (PEF) und Haut-Prick-Test (HPT). <br>In dieser Dissertation wird der Frage nachgegangen, ob es bei den Kindern einen Zusammenhang zwischen nasaler Inflammation, gemessen anhand der NAL-Parameter, und bronchialer Hyperreaktivität, ermittelt anhand der …
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The effect of electrical processing on mass transfer and mechanical properties of food materials
… the effect of MEF and pulsed electrical fields (PEF) on mechanical properties of polymer networks. MEF treatment was performed with continuous alternating current (50Hz frequency) at electrical fields up to 1400V m\(^{-1}\) using a jacket system processing cell to maintain constant temperatures. …
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Algae Lysis with Pulsed Electric Fields
… of cell lysis through pulsed electric field (PEF) application that enables cost-effective extraction methods relative to current enzyme and sonication techniques.</p> <p>A theoretical model for cell membrane potential in the presence of electric field was developed, and PEF chambers were …
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Política Exterior Feminista en Latinoamérica
… llevar adelante una Política Exterior Feminista (PEF), no hay estudios que evalúen en qué medida estos países han incorporado políticas que promuevan la igualdad de género en su política exterior. Este trabajo se propone llenar parte de ese vacío realizando un estudio descriptivo, que compara la …
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Modeling of Concentrated High Intensity Electric Field (CHIEF) and Its Comparison with Other Non-thermal Liquid Food Pasteurization Technologies
… homogenization (HPH), and pulsed electric field (PEF). These non-thermal technologies, together with concentrated high intensity electric field (CHIEF) are studied and compared in this thesis research. This study used finite element (FEM) and computational fluid dynamics (CFD) methods to model and …
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Προβλεπόμενες (φυσιολογικές) τιμές της σπιρομέτρησης και της καμπύλης ροής/όγκου για τις ηλικίες 7 έως 15 ετών του ελληνικού πληθυσμού
… lam-15 Fucunda. The FVC, FEV₁, FEV₁%/FVC. MMFR, PEF, MEF₇₅, MEF₅₀, MEF₂₅, tests were computed manually from the hard copy of the X/Y recorder by the author. The FVC was computed from the acceptable effort with the best value, the FEV₁, and the MMFR from the one with FEV₁ best value, and the PEF …
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The determinants of the risk premium required by Italian private equity funds.
… required by Italian private equity funds (PEFs) when valuing privately-held target companies. In theory, perceived risk is a key driver of expected returns and anticipated value, but: ¿Although PE (private equity) has experienced rapid growth, the risk and return profile of this asset class …
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Calpain inhibitor design inspired by the natural inhibitor calpastatin
… the calpain enzyme through binding to the PEF domain questioned. The compound PD150606 was able to inhibit the protease core of calpain, which lacks the PEF domain of the full enzyme, and the penta-peptide LSEAL was found to have no effect at all on calpain in vitro. Thus it is now clear …
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The development of welding fumes health risk assessment tool for automotive component related industries
… mean index value=1.42, FVC=84.09%, FEV1=88.51%, PEF= 68.58%, significant persistent symptom: sore or dry throat; Plant 2: mean index value=1.40, FVC=87.86%, FEV1=91.14%, PEF=71.68%, significant persistent symptom: none ;Plant 3: mean index value=1.30, FVC=89.65%, FEV1=91.96%, PEF= 80.57%, …
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Cascaded High Voltage Converter with Variable Control for Pulsed Electric Field Applications
… in order to create a pulsed electric field (PEF) to lyse algae. The proposed system is unique from any known PEF systems because it provides the ability to independently adjust peak voltage, pulse width and frequency of the output voltage. This in turn provides great flexibility in …
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