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Rozprawy doktorskie na temat „Low-frequency pulse”

Autor: Grafiati

Data publikacji: 2 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Langrock, Carsten. "Classical and low-light-level detection and pulse characterization using optical-frequency mixers /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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Hampus, Carlsson, and Öhlund Martina. "LOW COST ULTRA WIDEBANDRADAR FOR HUMAN PROTECTION." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-28359.

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The majority of the UWB radars available on the market today are expensive and often closed forfurther development due to proprietary rights. Therefore it is difficult to fully understand and adaptthe functionality of an available UWB system to fit one’s needs. The consulting-firm Addiva purchasedan UWB radar to be used in a safety system. However, the radar had limitations and the functionalityof it was partly unknown. This master thesis was inspired from this issue to examine the possibilitiesof developing a low-cost UWB radar, with main focus on research of human detection. The systemshould

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Cassidy, Brian Michael. "A Constant ON-Time 3-Level Buck Converter for Low Power Applications." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/73211.

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Smart cameras operate mostly in sleep mode, which is light load for power supplies. Typical buck converter applications have low efficiency under the light load condition, primarily from their power stage and control being optimized for heavy load. The battery life of a smart camera can be extended through improvement of the light load efficiency of the buck converter. This thesis research investigated the first stage converter of a car black box to provide power to a microprocessor, camera, and several other peripherals. The input voltage of the converter is 12 V, and the output voltage is 5

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Hung, Ching-Sui. "Effects of pulse-modulated microwave radiation from mobile phones on the sleep/waking EEG and psychomotor vigilance." Thesis, Loughborough University, 2008. https://dspace.lboro.ac.uk/2134/15747.

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This study employed multiple assessments, including sleep/resting waking EEG (visual scoring and power spectral analysis) and psychomotor vigilance task, to access effects of varying pulse-modulated microwaves (such as: 'talk', 'listen' and 'standby' mode signals) emitted from a standard mobile phone. The idea was prompted by a finding that the pulse modulation frequencies of mobile phone signals correspond to the frequencies of brain delta and alpha waves. Thereby it is possible the brain is able to recognize and respond to the low-frequency components of the mobile phone signals. Supporting

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Fakhfakh, Seifeddine. "Nouvelles méthodes de caractérisation et de modélisation non-linéaire électrothermique des effets de piège dans la technologie HEMT GaN pour l’étude de la stabilité pulse à pulse dans les applications radar." Thesis, Limoges, 2018. http://www.theses.fr/2018LIMO0103/document.

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La capacité d’un émetteur radar à assurer la bonne détection des cibles mouvantes sans générer de fausses alertes dépend principalement de sa stabilité pulse à pulse qui est affectée par de nombreux facteurs tels que les effets mécaniques, thermiques et électriques. Cependant, la stabilité pulse à pulse d’un émetteur radar à impulsions est liée à celle de ses amplificateurs de puissance, et plus particulièrement à la technologie des dispositifs actifs. Dans ce sens, ce travail présente une analyse de ce critère radar au plus près du composant (au niveau d’un transistor HEMT GaN) dans le cas d’

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Abu-Shikhah, Nazih M. "New methods in speech enhancement, and modelling, with applications to low bit rate speech coding." Thesis, Queensland University of Technology, 2001.

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Kirkconnell, Carl Scott. "Numerical analysis of the mass flow and thermal behavior in high-frequency pulse tubes." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/16434.

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8

Deshpande, Kshitija Bharat. "A Dedicated Search for Low Frequency Radio Transient Astrophysical Events using ETA." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/35666.

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Astrophysical phenomena such as self-annihilation of primordial black holes (PBHs), gamma ray bursts (GRBs), and supernovae are expected to produce single dispersed pulses detectable in the low end of the radio spectrum. Analysis of these pulses could provide valuable information about the sources, and the surrounding and intervening medium. The Eight-meter-wavelength Transient Array (ETA) is a radio telescope dedicated to the search for these pulses in an 18 MHz bandwidth centered at 38 MHz. ETA consists of 10 dual-polarized active dipoles providing an all-sky field of view. This thesis descr

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9

Yeago, Taylor Craig. "A Two-Phase Buck Converter with Optimum Phase Selection for Low Power Applications." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/51230.

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Power consumption of smart cameras varies significantly between sleep mode and active mode, and a smart camera operates in sleep mode for 80 — 90% of time for typical use. To prolong the battery life of smart cameras, it is essential to increase the power converter efficiency for light load, while being able to manage heavy load. The power stage of traditional buck converter is optimized for maximum load, at the cost of light-load efficiency. Wei proposed a multiphase buck converter incorporating the baby-buck concept and optimum number of phases (ONP) control. This thesis research investigate

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10

Pumarica, Julio César Saldaña. "Projeto de modelos neurais pulsados em CMOS." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-01032011-115940/.

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O presente trabalho descreve o projeto de modelos neurais pulsados em tecnologia CMOS. Foram projetados dois modelos: um neurônio baseado em condutâncias e um neurônio do tipo integra e dispara. O primeiro gera impulsos elétricos similares aos potenciais de ação gerados pelo neurônio biológico. Mediante simulação, foram observadas as seguintes características: disparo do impulso quando se atinge a tensão de limiar, hiperpolarização após o potencial de ação, retorno passivo à tensão de repouso, presença de período refratário e relação sigmoide entre a frequência de disparo e a intensidade do es

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11

Ronchi, Nicolò. "An investigation of defects and reliability issues on Gallium Nitride devices." Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3421973.

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In this thesis a extensive study of devices based on AlGaN/GaN heterostructure is reported. The work is fundamentally divided in two main topic: the first part is related to the investigation of traps and defects and their effects on the device performances; the second part is instead related to the reliability studies of this type of devices. The investigation of trapping effects is based on pulsed measurements of output characteristic and transcharacteristic of the device under test. The measurements carried out on High Electron Mobility Transistors (HEMT) with different gate materials (Ni

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12

Liao, Shih-Chieh, and 廖士傑. "Low current, pulse-frequency modulation converter." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/86023484578794714759.

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碩士<br>逢甲大學<br>電子工程所<br>92<br>In recent years, the CMOS integrated circuit technology has been successfully applied to a lot of systems. In order to provide efficient power for portable devices, the low voltage and low current circuits would be the trend for current CMOS development. To deal with faster and more complicated analog signals, most of research directions for pulse modulation circuits focus on the precise output waveform and fast response time. The design of pulse modulation circuit is in a mature stage now, however, due to the advance of process technology, how to achieve a low vo

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13

Tripathi, Avanish. "Low Switching Frequency Pulse Width Modulation for Induction Motor Drives." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/3688.

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Induction motor (IM) drives are employed in a wide range of industries due to low maintenance, improved efficiency and low emissions. Industrial installations of high-power IM drives rated up to 30 MW have been reported. The IM drives are also employed in ultra high-speed applications with shaft speeds as high as 500; 000 rpm. Certain applications of IM drives such as gas compressors demand high power at high speeds (e.g. 10 MW at 20; 000 rpm). In high-power voltage source inverter (VSI) fed induction motor drives, the semiconductor devices experience high switching energy losses during switc

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Tripathi, Avanish. "Low Switching Frequency Pulse Width Modulation for Induction Motor Drives." Thesis, 2017. http://etd.iisc.ernet.in/2005/3688.

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Induction motor (IM) drives are employed in a wide range of industries due to low maintenance, improved efficiency and low emissions. Industrial installations of high-power IM drives rated up to 30 MW have been reported. The IM drives are also employed in ultra high-speed applications with shaft speeds as high as 500; 000 rpm. Certain applications of IM drives such as gas compressors demand high power at high speeds (e.g. 10 MW at 20; 000 rpm). In high-power voltage source inverter (VSI) fed induction motor drives, the semiconductor devices experience high switching energy losses during switc

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15

Liu, Wei-Chen, and 劉威辰. "Pulse Inversion on Doppler Detection in High-Frequency Ultrasound Image of Low-velocity Blood Flow." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/76563511548862794217.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>101<br>Swept-scan mode is often used in High-frequency ultrasound Doppler estimation for the blood flow information. But it will cause the tissue spectral broadening effect in the Doppler spectrum when using Swept-scan. In order to remove the tissue signal, the cut-off frequency of wall filter must be increased. The increase of cut-off frequency leads to the loss of low-velocity blood signal and an incorrect estimate result of blood flow detection. To alleviate the effect of wall filtering on low-velocity blood signal, the suppression of tissue Doppler signal with mi

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16

Chen, Yu-Kai, and 陳郁凱. "Efficiency-Improved Low Input-Voltage Boost Converter With Pulse Frequency Modulation Control for Thermoelectric Energy." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/04645694296780889509.

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17

YaoYap, Roderick, and 傅金浚. "A Low Voltage Dynamic Power Saving Pulse Frequency Modulated Boost Converter Design for Driving a White LED." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/36330062983277492515.

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碩士<br>中原大學<br>電子工程研究所<br>96<br>Abstract Power management can be considered an essential component for various integrated circuit applications. Be it in audio, video, data or signal processing, power management can become an indispensable component. Power management integrated circuits can step up or step down the input voltage supply normally provided by a battery to a level suitable for the load it is intended to drive. These DC to DC converters can be available as Buck (step down) converters or Boost (step up) converters. A Boost converter is normally needed when a single battery is inte

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18

Liang-YunChen and 陳喨允. "Design of a Pulse-Frequency-Modulation Controlled DC-DC Boost Converter with Low-Startup Voltage and Wide-Input-Range." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/nuf4h3.

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碩士<br>國立成功大學<br>電機工程學系<br>104<br>Limitation of the natural resources makes the development of green energies more and more important in recent years, but the power provided by green energies are usually low. A pulse-frequency-modulation (PFM) controlled boost converter with a low-startup voltage and wide-input-range is proposed in this thesis for converting green energies. Medium-Vt MOSFET model is used to reduce the startup voltage of the converter. To achieve wide-input-range, a voltage detector is used for avoiding over-charge of pumping voltage in startup circuit. In order to achieve high

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19

Hsieh, Po-Yu, and 謝柏宇. "A 5-GHz Low Noise Frequency Synthesizer with Combination of Sub-Sampling Phase Detector and Pulse Width to Current Modulation." Thesis, 2019. http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22107NCHU5441041%22.&searchmode=basic.

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碩士<br>國立中興大學<br>電機工程學系所<br>107<br>With the popularization of communication devices such as smart phones, the demand for electronic products in the consumer market is getting higher and higher, and it has led to the advancement of the integrated circuit industry. The stability of communication system greatly relies on the purity of the local oscillator. For this reason, frequency synthesizer has become a hot research topic, and the noise suppression of the frequency synthesizer is one of our main research objectives. This thesis will be applied to the channel specification IEEE 802.11 a 5GHz lo

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20

Demers, Jean-Philippe. "From Slow to Ultra-fast MAS: Structural Determination of Type-Three Secretion System Bacterial Needles and Inorganic Materials by Solid-State NMR." Doctoral thesis, 2014. http://hdl.handle.net/11858/00-1735-0000-0023-9968-3.

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21

Chen, Po-Fan, and 陳泊汎. "Study on Different Low Frequency Pulsed Electromagnetic Field Stimulation on Osteoblasts Growth." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/4e9b65.

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碩士<br>中原大學<br>醫學工程研究所<br>91<br>Pulsed Electromagnetic Fields（PEMF） has many medical applications. Previous animal and clinical studies have clearly showed a positive effect of PEMF on the rate of osseous repair. The purpose of this study is to find the optimal parameters of PEMF stimulation on the growth of osteoblasts. The cranium off new born Wistar rats were harvested and cultured. The experiment were divided into two parts : The first part was to find the better exposure time of the single pulse ( 7.5 Hz ) electromagnetic field with induced electric field intensities of 2 mV/cm, which inv

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22

Chang, Kua-Ying, and 張冠英. "Set up a Low-Temperature Pulsed High-Frequency Surface-Acoustic-Wave Detecting System." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/09587345262529927475.

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碩士<br>國立中興大學<br>物理學系<br>89<br>Nowadays surface acoustic wave (SAW) devices are very important in high- frequency tele-communication. It can not only be used as a frequency filter, a delay line or a signal modulator, but also as a very good sensor. In our experiments, we use surface acoustic waves to probe the change of the conductivity of the material. Here the SAW device serves as a sensor. The change of the conductivity of the material nearby can be detected by the shift of the velocity and the attenuation of the SAW. We use a pulse-modulated radio-frequency source and

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23

Lukic, Zdravko. "Design and Practical Implementation of Advanced Reconfigurable Digital Controllers for Low-power Multi-phase DC-DC Converters." Thesis, 2012. http://hdl.handle.net/1807/33855.

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The main goal of this thesis is to develop practical digital controller architectures for multi-phase dc-dc converters utilized in low power (up to few hundred watts) and cost-sensitive applications. The proposed controllers are suitable for on-chip integration while being capable of providing advanced features, such as dynamic efficiency optimization, inductor current estimation, converter component identification, as well as combined dynamic current sharing and fast transient response. The first part of this thesis addresses challenges related to the practical implementation of digital cont

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24

Wang, Kuang-Lei, and 王光磊. "Low Vacuum Radio Frequency-Plasma Enhanced Pulsed Laser Deposition of Indium Gallium Zine Oxide(IGZO) Thin Film." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/gkh67k.

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碩士<br>國立暨南國際大學<br>光電科技碩士學位學程在職專班<br>105<br>This research is using Pulsed Laser Deposition Thin Film and Radio Frequency with chember heater, to discuss the structure, morphology, characteristics and the electrical propoty of the IGZO thin film; utilizing 1:2:1 mole% as the IGZO target material to prepare the IGZO thin film to deposit on the base material. Field Emission Scanning Electron Microscope (FESEM) was used to analyze the surface morphology, thickness. The experiment is using X-ray diffraction to analyze the crystal structure of the thin film and to conduct its property analysis.

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25

Yin-LungKe and 柯銀隆. "Influence of Electromagnetic Signal of Antibiotics Excited by Low Frequency Pulsed Electromagnetic Fields on Growth of Escherichia coli." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/23344762845865227317.

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Lai, Chih-Chang, and 賴志昌. "Low vacuum, room temperature radio frequency-plasma enhanced pulsed laser deposition of Indium Gallium Zinc Oxide (IGZO) thin film." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/99527021620468227353.

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碩士<br>國立暨南國際大學<br>光電科技碩士學位學程在職專班<br>103<br>This research is using the Pulsed Laser Deposition Thin Film and Radio Frequency Plasma Laser Deposition to conduct oxygen flow quantity and processing power to control the deposition of IGZO thin film and to discuss the structure, morphology, characteristics and the electrical property of the IGZO thin film; utilizing 1:1:1 mole% as the IGZO Target material to prepare the IGZO thin film to deposit on the base material. The experiment is using X-ray diffraction to analyze the crystal structure of the thin film and to conduct its property analysis.

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