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 31 for “"Pulse Generator"”.
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Progesterone Regulation of the GnRH Pulse Generator
… the gonadotrophin- releasing hormone (GnRH) pulse generator responsible for driving the pulsatile release of GnRH and luteinising hormone (LH) secretion. In a healthy menstruating woman, following the mid-cycle ovulation, progesterone (P4) levels dramatically increase and exert a negative …
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The LHRH pulse generator in the New Zealand white rabbit
… I have studied the in vivo activity of the LHRH pulse generator in the rabbit, a reflex ovulator, using a push-pull cannulae (PPC) procedure that allows the detection of the release of this neuropeptide from the hypothalamus of freely behaving animals. The present thesis examines the normal …
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The control of a high-speed, low-jitter pulse generator
Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 1986
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The action of ovarian steroids on the hypothalamic LHRH pulse generator
… of ovarian steroids upon the hypothalamic LHRH pulse generator in the female rat, I have examined the in vivo activity of the hypothalamic LHRH pulse generator in the different endocrine conditions which was followed by the study on the action of progestins on LHRH release from …
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Design, Construction, and Operation of a Fast Rise Time, High Voltage Pulse Generator
Made available in DSpace on 2017-07-06T18:59:00Z (GMT). No. of bitstreams: 2 Stygar_William_A_MS.pdf: 39230253 bytes, checksum: 2e326b306be997fb69d8c55105b1ce45 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1980
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A Study of a Versatile Low Power CMOS Pulse Generator for Ultra Wideband Radios
… In this thesis, we describe the design of a CMOS pulse generator for impulse based UWB systems. The structure of our pulse generator is based on the topology of a single tap CMOS power amplifier. By increasing the number of taps on a CMOS power amplifier, it is possible to generate sub-nanosecond …
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Dynamical Systems Analysis of Neural Circuits with Applications to Physiological Processes
… neuronal oscillator known as the GnRH pulse generator. The timing and pattern of GnRH secretion are essential, with disruptions leading to reproductive dysfunction. Reproduction is fundamentally controlled by the brain, with the GnRH pulse generator acting as an integrative hub that …
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In-vivo analysis of hypothalamic kisspeptin neuron activity patterns
… in the arcuate nucleus (ARNKISS), known as the pulse generator, and in the rostral periventricular area of the third ventricle (RP3VKISS) operating as the surge generator. The pituitary gland responds to GnRH by releasing luteinizing hormone (LH) and follicle-stimulating hormone (FSH) which …
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Silicon-Based RFIC Multi-band Transmitter Front Ends for Ultra-Wideband Communications and Sensor Applications
… detail. To generate the required UWB signals, pulse generators are designed and integrated into the transmitter chips. The first prototype UWB transmitter is designed in Freescale Semiconductor 0.18μm SiGe BiCMOS technology for operation over three 500 MHz bands at center frequencies of …
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Design, fabrication and application of a dedicated thick-film hybrid time domain reflectometer
… The design process allows for variation of the pulse generator characteristics as well as the output impedance of the unit. The unit is fabricated using standard thick-film hybrid techniques while giving consideration to problems encountered at microwave frequencies. This thesis also presents an …
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A no load simulation model of a DC drive system
… current loop. The power stage is composed of a pulse generator module and a scr bridge, while the motor is a permanent magnet DC motor. A detailed development of each module model is included to reveal the open loop characteristics of the system. A total system state model was developed from …
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Measuring Acoustic Attenuation of Polymer Materials Using Drop Ball Test
… evaluated in the MHz frequency range, using a pulse generator and transmitting transducer as the wave source. However, most real acoustic activities occur at frequencies up to a few hundred kHz. Here, a simple drop ball mechanism is used to generate acoustic source waves in the kHz range, and …
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ESD circuit design and measurement techniques
… structures. The setup uses a transmission line pulse generator with a time domain through connection to measure the device under test current. The setup is then used to measure reverse recovery in a 65 nm CMOS ESD diode, and it is found that a quasi-static compact model does not accurately …
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Direct Multielemental Analysis of Solid Samples Using Laser Ablation Inductively Coupled Plasma Mass Spectometry and Pulsed Radio Frequency Glow Discharge Mass Spectrometry
… by dc-source analysis. Further addition of a pulse generator to the rf-source resulted in a variable duty cycle, allowing greater ionization efficiency without the risk of catastrophic damage to the sample. The results of this research indicate that the LA-ICPMS system can be used to directly …
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Focal waveform of a prolate-spheroidal impulse radiating antenna (IRA)
Impulse Radiating Antennas (IRAs) are designed to radiate very fast pulses in a narrow beam with low dispersion and high field amplitude. For this reason they have been used in a variety of applications. IRAs have been developed for the transient far-field region using paraboloidal reflectors. …
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Non-invasive monitoring of bone health using ultrasound
… are mounted over the test specimen. A pulse generator excites the transmitting receiver. The second receiver is mounted next to the transmitter and acts as a reference receiver that displays the response across a normal area. The third transducer is mounted across the area suspected to …
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Investigation and characterization of a high energy piezoelectric pulse
… and characterizes 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 …
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Penetration force measurements in the central nervous system with silicon electrodes
… intactness of the cortex. The microelectrode was pulsed at a rate of 5 Hz using a piezoelectric crystal and a pulse generator. The results show that the vibration technique is successful in reducing the penetration force by 25%. In this study, we have concentrated only on reducing the penetration …
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Wireless Sub-Cellular Sized Stimulators for Minimally Invasive Deep Brain Stimulation with High Spatiotemporal Resolution
… frequency (>85 Hz) electrical stimulation via a pulse generator. In properly selected patients, DBS is proven to be remarkably effective, alleviating motor symptoms that either do not fully respond to medication treatment (such as tremor) or are caused by it (levodopa-induced dyskinesia). …
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The effect of electrical processing on mass transfer and mechanical properties of food materials
… to polymer networks; and 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 …
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