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 19 of 19 for “"Electrical pulses"”.
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The Correlation Between Electrical Pulses and Light Flashes in a Proportional Counter.
… one primary ion pair is sufficient to cause an electrical discharge that expands to fill the whole volume of the Geiger tube. In pulse ion chambers, on the other hand, the electric field is not high enough to cause any further ionization, thus only the charge separated by the radiation will be …
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The application of GHz bandwidth electrical pulses to a single semiconductor quantum dot.
… isolated using confocal microscopy, and electrically manipulated using an applied voltage. This thesis presents progress towards full opto-electrical control over a single dot, with a specific interest in the creation of a fully controllable electrically triggered deterministic single …
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Scaling and Performance of a Device for Fluidized Bed Entrainment Reduction
… determined the particle mass flux by counting electrical pulses produced when particles collided with a metal sensor placed in the flow stream. Air velocity was measured with a rugged hot film anemometer.
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Neuroninių sistemų slopinimo ir desinchronizavimo algoritmai /
… of neural activity is oscillations. Through the electrical interaction, neurons tend to synchronize their rhythms and approach a coherent behaviour. On the one hand synchronous neural behaviour relates with such crucial brain functions as vision and memory, while on other hand pathological …
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Highly tunable room temperature quantum cascade lasers
… gas imaging systems. Such a laser must produce pulses of >5ns in duration at a repetition rate of at least 5kHz with peak pulse powers of >10mW. The main QCL examined was an InAs/AlSb based device which had been carefully designed to maintain efficient electron injection and reduce thermal …
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High Frequency Irreversible Electroporation (H-FIRE) as a Therapeutic Modality for Liver Cancer Treatment and Its Effect on the systemic Extracellular Vesicle Population
… technique that uses intense, short, bipolar electrical pulses to induce cell death in cancerous tissues. It's being studied for treating hepatocellular carcinoma (HCC) in dogs. Previous in vitro research suggests H-FIRE may impact the release of extracellular vesicles (EVs). This study aims …
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The Biological and Immunological Effects of Irreversible Electroporation and Combination Therapy Options for the Improving the Treatment of Pancreatic Cancer
… (IRE) utilizes short, high voltage electrical pulses to form microlesions in cell membranes and induce cell death. While IRE has had significant impact in pancreatic cancer treatment in clinical trials, little is known on the biological and immunological effects of IRE on pancreatic …
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Effects of Irreversible Electroporation and High-Frequency Irreversible Electroporation for the Treatment of Breast Cancer
… (IRE) delivers a series of long, monopolar electrical pulses via electrodes inserted directly into the targeted tissue which disrupt cellular membranes by creating nano-scale pores, killing the cells via loss of homeostasis while promoting an immune response. However, IRE requires cardiac …
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Verbs and nouns in awake neurosurgery: needs and answers
… during surgery to perform language tasks during electrical stimulation of cortico-subcortical brain structures. When the application of electrical pulses to the brain repeatedly triggers errors, this is taken as an indication that the area is critically involved in the language skills probed by …
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Quantitative In Vitro Characterization of Membrane Permeability for Electroporated Mammalian Cells
… may be used to quantify the effects of the electrical stimulus and environmental conditions leading to membrane electroporation. Specifically, a series of electrical pulses that alternates between positive and negative pulses permeabilizes cells more symmetrically than a longer pulse with …
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Pulse electric field effect on cervical cancer cell: a plant based anti-cancer study
… into cervical cancer cell with the aid of electrical pulses or electroporation technique to investigate on the anti-cancer mechanism. Electroporation parameters utilized in this study ranging from 200V/cm, 400V/cm, 600V/cm, 800V/cm, 1000V/cm of pulse amplitude, while pulse duration ranging …
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Using Phoneme Groups to Train Deep Learning Models to Remove Reverberation in Cochlear Implant Stimulus Patterns
… an acoustic signal into a sequence of electrical pulses that stimulate the auditory nerve, resulting in the perception of sound. However, compared to normal-hearing individuals, CI users experience considerable amounts of difficulty in understanding speech in listening environments that …
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Ultrashort pulse generation from diode laser devices
… study of generation of ultrashort optical pulses from diode lasers. Simple and cost-effective techniques were used to generate high power, high quality optical short pulses at various wavelength windows. The major achievements presented in the thesis is summarised as follows. High power …
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Biosynthesis of polyhydroxyalkanoates for cardiac tissue engineering applications
… were stimulated at a range of frequencies of electrical pulses or calcium concentrations. These results showed that P(3HO) did not have any deleterious effects on the contraction of adult cardiomyocytes. P(3HO) cardiac patches nonporous, porous or with P(3HO) electrospun fibres deposited on …
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Strategies for Overcoming Shortcomings of Thermal Ablations: A Comprehensive Study of Nanoparticle Transport During Photothermal Chemotherapy Treatments, and High Frequency Irreversible Electroporation
… destroying cell membrane function through short electrical pulses. The goal of the present study is to research two novel potential treatments for cancer that do not require thermal destruction of tissue. Firstly, we developed and tested novel ways to load the antineoplastic agent Cisplatin into …
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Optical rectification in semiconductor waveguides
… conversion and generation of ultrashort electrical pulses by the use of optical rectification at telecommunication wavelengths, λ = 1550 nm. By using optical rectification, an electromagnetic pulse is generated in a completely passive semiconductor waveguide. This pulse is coupled in a …
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In-situ plasmon-enhanced characterization of optically accessible ultra-thin film ferroelectric devices
… (NPoM) technique that uses gold nanoparticles as electrical contacts, providing both nano-sized electrodes and substantial optical enhancement in the biased region. This allows for the first accurate and non-invasive simultaneous optical and electrical evaluation of nanomaterials. This thesis …
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Improvements in Pulse Parameter Selection for Electroporation-Based Therapies
… a non-thermal tissue ablation modality in which electrical pulses are used to generate targeted disruption of cellular membranes. Clinically, IRE is administered by inserting one or more needles within or around a region of interest, then applying a series of short, high amplitude pulsed electric …
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Large-scale neuronal networks: from simulation technology to the study of plasticity-driven cognitive processes
… by a membrane potential and a mechanism to emit electrical pulses for communication with other neurons. While mean-field approaches are suitable for the simulations of models of the entire brain with population resolution, spiking neural networks can simulate portions of the brain at cellular …