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 20 for “"input resistance"”.
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On the accuracy of estimating input impedance of probe-fed air-substrate microstrip patch antennas using the theory of characteristic modes
… modes are developed to estimate the input impedance of air-substrate, coaxial probe-fed, microstrip patch antennas with arbitrarily shaped patches. Such an antenna with an L-shaped patch is fabricated and experimentally measured, and a case study performed comparing the accuracy of …
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Elucidating the reversibility of ataxia
… with posterior KO PCs appearing to have elevated input resistance. Two-week expression of C-trm b-III spectrin in 3-month old KO animals significantly reduced Purkinje cell input resistance when compared to non-transduced cells (p=0.0139, N=4-5, n=15), but no effect was seen 9 months after viral …
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Precise optical manipulation techniques for exploring neuronal function
… of spatio-temporal patterns of synaptic input for integration studies. A technique for optimising the holographic projection technique used for photostimulation is also presented. The technique incorporates a generalised phase contrast (GPC) setup into a typical SLM holographic setup to …
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Precise optical manipulation techniques for exploring neuronal function
… of spatio-temporal patterns of synaptic input for integration studies. A technique for optimising the holographic projection technique used for photostimulation is also presented. The technique incorporates a generalised phase contrast (GPC) setup into a typical SLM holographic setup to …
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The Average Potential Method of Calculating the Resistance of Power Substation Grounding Systems.
… Equations are derived for calculating the self resistance of each component of the grounding system and for calculating the mutual resistances between each component of the grounding system. Next, techniques are developed for using these self and mutual resistances to obtain the input resistance …
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Robot gripper control system using PVDF piezoelectric sensors
… to actively damp exerted force. By using a low-input-resistance amplifier to sense the current developed by the PVDF sensor, an output proportional to the rate of change of the force exerted by the gripper is obtained. The signals from the PVDF sensor and a strain gauge force sensor are arranged …
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The Role of Perineuronal Nets in Regulating Barrel Cortex Physiology
… and supragranular layers depend more on sensory input than the infragranular layers ; 2) sensory deprivation induces reductions in spike frequency, probability and mildly reduces input resistance, while significantly increasing action potential amplitude in fast spiking (FS) inhibitory …
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Regulation of Neuronal Excitability by Glutamate and Cholecystokinin Rodent Neocortex
… that was associated with an increase in apparent input resistance and persisted in tetrodotoxin. This depolarization was mediated by CCKB subtype receptors, and resulted from a reduced linear K+ current as well as an increase in a nonselective cation current. I also found that CCK produces …
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Investigation of Low Profile Antenna Designs for Use in Hand-Held Radios
… small and low-profile antennas experience high input reactance, low input resistance, and low radiation efficiency.Further degradation of radiation efficiency occurs in hand-held radios due to size-reduced ground planes, losses within the plastic device casing, and losses due to coupling with …
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Membrane properties and calcium ion activity in skeletal muscle fibres of the dystrophic mouse
… parameters (Resting membrane potential [RMP] and input resistance) reached adult magnitude in normal soleus and extensor digitorum longus (EDL) by 4 weeks and 3 weeks respectively. Electrophysiological parameters in dystrophic soleus developed in a similar maimer to normal muscle, but RMP in …
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Intrinsic Biophysical Properties of Frog Central Auditory Neurons
… neurons are homogeneous, showing high membrane input resistance and long time constant, and uniformly sustained-chopper temporal discharge patterns in response to depolarization currents---unlike the various phenotypes in the lower auditory brainstem the thalamic neurons cannot follow fast or …
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CMOS Receiver Design for Optical Communications over the Data-Rate of 20 Gb/s
… is investigated in the dissertation. A new input-stage topology for a transimpedance amplifier (TIA) is designed to achieve 50% higher data-rate is presented, and a new architecture for clock recovery is proposed for 50% higher clock rate. The TIA is based on a gm-boosted common-gate …
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Helical Antenna Optimization Using Genetic Algorithms
… gain than the conventional helix. Also, the input resistance remains relatively constant over the bandwidth. On the other hand, for nearly the same bandwidth and gain, the GA-optimized helix offers a size reduction of 2:1 relative to the conventional helix. The optimization is achieved by …
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DC-DC Converter Control System for the Energy Harvesting from Exercise Machines System
<p>Current exercise machines create resistance to motion and dissipate energy as heat. Some companies create ways to harness this energy, but not cost-effectively. The Energy Harvesting from Exercise Machines (EHFEM) project reduces the cost of harnessing the renewable energy. The system …
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Higher Brain Neurons Succumb to Acute Stroke-Like Insult While Lower Brain Neurons Strongly Resist
… lower neurons recover their membrane potential, input resistance and spike amplitude when oxygen and glucose is restored, while higher neurons do not. Following OGD, new recordings could be acquired in all lower (but not higher) brain regions, with some neurons even withstanding multiple OGD …
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Stability Analysis of Three-Phase AC Power Systems Based on Measured D-Q Frame Impedances
… loads (CPLs) exhibit a negative incremental input resistance within the output voltage regulation bandwidth. In the case of dc systems, design requirements for impedances that guarantee stability have been previously developed and are used in the design and specification of these systems. In …
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The effects of rapid stretch injury on rat neocortical cultures
… membrane potential (-40 +/- 1 mV [n=20]) or input resistance (1.0 +/- 0.1 G[Omega] [n=20]) are observed in injured and non-injured neurons. Interestingly, stretch injury reduces the frequency of spontaneous action potentials (33 +/- 6 min^{-1} [ n=13] and 11 +/- 3 min^{-1} [n=16] in …
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Chemogenetics, Induced Neurons and Pluripotent Stem Cells: Towards Advanced Gene and Cell Therapies Targeting Epilepsy
… features, however, such as high input resistance. Next, we studied long-term survival of human foetal fibroblast-derived induced neurons (iN) in rodent hippocampus. Human iNs survive and maintain neuronal profile up to six months post-grafting, developing more elaborate neuronal …
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Unique Response Properties and GABA<sub>A</sub> Receptor Function in Medial Geniculate Body Neurons of Young and Aged Fischer Brown Norway Rats
… expressed by MGB neurons decreased input resistance, hyperpolarized resting membrane potential, reduced evoked firing rates and induced a transition from tonic to burst firing mode. In aged MGB neurons there was a significant 50.4% reduction in GABA<sub>A</sub>R-mediated tonic Cl- …
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Role of galanin in synaptic transmission and plasticity in the CA1 area of the rodent hippocampus
… of spike frequency adaptation and increase in input resistance evoked by metabotropic glutamate receptor activation, indicating that its inhibition of LTP was downstream ofthese receptors. Galanin applied had no effect the expression of LTP indicating that galanin may inhibit LTP by interfering …