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 44 for “"Pulse frequency"”.
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Target strength of bat prey in relation to pulse frequency and vegetation density in bat species, Rhinolophus fumigatus (Rüppell's horseshoe bat)
… a negative correlation between peak echolocation frequency and body size is observed. However, there are various exceptions to the general allometric relationship observed between body size and echolocation pulse frequency of both low-duty cycle and high-duty cycle bats. One such example in high …
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Shocking results: assessing the injury rates of fishes from pulsed-DC electrofishing
… caused by electrofishing. To test whether pulse frequency affects injury rates of silver carp, I conducted PDC electrofishing in a side channel of the Illinois River at two pulse frequency setting. Pulse frequency appears to have a substantial effect on injury rate, as reducing pulse …
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Follicular dynamics, estradiol-17[beta] concentrations, and luteinizing hormone release following norgestomet implant insertion during estrus synchronization with melengestrol acetate
… acetate (MGA) administration altered LH pulse frequency and follicular dynamics. Multiparous Angus cows were randomly assigned to receive MGA (.5 mg*cow⁻¹*d⁻¹ ; MGA; n = 14) for 18 d or to receive MGA (.5 mg*cow·⁻¹ l*d⁻¹; MGA-N; n = 11) for 15 d and a norgestomet implant for 4 d …
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Temporal integration in the neural substrate for brain stimulation reward : duration neglect and the peak-and-end model
… is affected by varying the train duration and pulse frequency, (b) examined how train duration and pulse frequency affect "duration neglect", and (c) compared the "peak" and "peak-and-end" models. Two male rats were chronically implanted with stimulating electrodes aimed at the lateral …
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Role of Endogenous Dopamine in Regulation of Anterior Pituitary Hormone Secretion During Early Postpartum and Various Stages of the Estrous Cycle in Holstein Cows
… (P < .05) in mean serum LH concentration and LH pulse frequency. Likewise, FLU caused a (P < .05) decrease in mean GH concentration. These results suggest that endogenous dopamine, at least in part, is responsible for regulation of LH and GH secretion in anovulatory Holstein cows. Experiment 2 …
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Problemas de instabilidade dinâmica na utilização de motor passo a passo em plotter
… Runge-Kutta method was performed. The effect of pulse frequency on the dynamic behaviour of the system w.as investigated. Theoretical predictions were compared with experimental measurements, the agreement being found to be satisfactory. The importance of torque and damping for reliable operation …
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A Comprehensive Study Of Nonlinear Effects Of Coupling Materials In Ultrasound Infrared Imaging
… associated with the application of a short pulse of low-frequency ultrasound. The technique uses pulses of ultrasonic excitation applied to a sample for a fraction of a second. The heating at the crack is then captured by calibrated infrared cameras using real-time video/digital imaging. …
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The neuroendocrine mechanism of reproductive photorefractoriness in the ewe
… photoperiod which induced seasonal anestrus. LH pulse pattern was monitored 8 h after cyproheptadine injection (3 mg/kg), and again 7 days later after injection of pimozide (0.25 mg/kg). Cyproheptadine did not change LH pulse parameters in any group of INTACT, OVX or OVX + E$\sb2$ ewes. Pimozide …
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Design and construction of a laboratory system for neuromuscular stimulation of the lower extremities during cycling
… channels. Waveform characteristics such as pulse frequency, width and amplitude are defined as a function of the crank position of the Paracycle for each channel. An extensive software package allows programmability of the waveform parameters and supports the user in the definition of …
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Designing an ultra low quiescent current buck switching regulator
… regulator. The converter will use burst mode, pulse frequency modulation, and pulse width modulation to achieve control over the entire load range. The capabilities of a full BiCMOS process technology will be taken advantage of to enable implementation of good control dynamics at low currents. …
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DC-DC converters with high efficiency over wide load ranges
… the regulator automatically switches between Pulse Frequency Modulation (PPM) and Pulse Width Modulation (PWM), and also automatically selects the optimum switching MOSFET. The current sensing is done without an additional current sense resistor. PFM mode operation is synchronous to allow …
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Studies of bronze electrodeposition.
… plating solution using conventional current and pulsed current electrolyses at various bath temperatures and anode and cathode current densities under galvanostatic conditions. The results from these tests have been interpreted and a set of optimum bath conditions has been decided upon to achieve …
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Kisspeptin and neurokinin B in the regulation of the human hypothalamic-pituitary-gonadal axis
… LH response to KP-10 was unaffected. LH pulse frequency was unchanged by the NK3R antagonist but basal (nonpulsatile) and pulsatile LH secretion was markedly reduced. Role of neurokinin B and kisspeptin in postmenopausal women Eleven postmenopausal women underwent LH pulsatility study …
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Finite element modeling of temperature elevation due to NIR exposure in neural tissue
… in the rat brain cortex as a response to a pulsed sequence of NIR laser beam are available. In this thesis, finite element modeling approach is used to model and simulate the temperature elevation in neural tissue under the effect of NIR laser pulsing. Steady state and transient analyses are …
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Engineering external heart assist device
… or singular fashion. The system also comprises a pulse frequency counter and a safety shut- off control circuits. A portable pressure-vacuum supply system and a pressure pulsating mechanism comprise the work done in completing the mechanical task. Of the two pressure pulsating mechanisms built and …
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Bi-directional Flyback Converter Circuit Design for Flapping-wing Microrobots
… with a careful component selection and a careful pulse frequency modulation, the bidirectional flyback converter can achieve a much better power consumption than a tapped boost circuit while maintaining the same or better level of performance.
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Control of LH secretion in red deer (Cervus elaphus)
… of oestradiol (5 µg) was able to suppress LH pulse frequency and mean concentration in the anoestrous season, but not in the breeding season. Dosage of oestradiol affected the time to onset of suppression - the greater the dose, the shorter the time required, and the high dose (100 µg) …
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Differential effect of melengestrol acetate or progesterone-releasing intravaginal devices on follicular development, progesterone and estradiol-17β concentrations and patterns of luteinizing hormone release during the bovine estrous cycle
… baseline LH concentrations and amplitude of LH pulses on d 17, 20 and 23 after onset of estrus did not differ (P>.10) among treatments. Luteinizing hormone pulse frequency was greater (P<.03) on d-20 after onset of estrus in MGA-2 cows than MGA-3 and PRID cows (4.3 ± .6 vs 2.6 ± .3 and 3.2 ± .4, …
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A functional MRI study of the distributed neural circuitry of learning and reward
… system increases with increasing current and frequency. In this study, operant conditioning with intracranial self-stimulation of the medial forebrain bundle (MFB) was used to correlate the rewarding quality of a stimulus with variations of its current amplitude (Part 1) or electrical pulse …
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