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 42 for “"Very low frequency"”.
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Analysis of very low frequency oscillations in electromagnetic brain signal recordings
Spontaneous very low frequency oscillations (<0.5 Hz), previously regarded as physiological noise, have of late been increasingly analysed in neuroimaging studies. These slow oscillations, which occur within widely distributed neuroanatomical systems and are unrelated to cardiac and respiratory …
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Very low frequency seismo-acoustic noise below the sea floor (0.2-10 Hz)
… for long range noise propagation. During the Low Frequency Acoustic Seismic Experiment (LFASE) a four-node, 12- channel borehole array (SEABASS) was deployed in the Blake Bahama Basin off the coast of eastern Florida (DSDP Hole 534B). This experiment is unique and is the first use of a …
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Very low frequency seismo-acoustic noise below the sea floor (0.2-10 Hz)
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, and the Woods Hole Oceanographic Institution, 1994.
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Design considerations of a thirty-kilowatt, thirty-kilohertz, full-bridge inverter for application in a very-low-frequency communications system
A thirty-kilohertz thirty-kilowatt full-bridge inverter design is presented. The inverter module forms an integral part of a very-low-frequency transmitter for a submarine communications application. Device selection and drive selection as well as testing data for inverter clamped mode of operation …
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Roles of gap junctions in neuronal networks
… the input of the second cable decreases, which allows the voltage of the second cable to attenuate more. Thus we show that there exists an optimal diameter for which the voltage amplitude in the second cable is maximized. Third, we investigate the dynamics of two gap-junctionally coupled theta …
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Investigation of the baroreflex of the rat : steady state and dynamic features
… there was a significant increase of power in the very low frequency region (0.00195 -0.2 Hz), and a significant decrease of power in the low frequency region (0.2 - 0.6 Hz) after SAD. The dominant power change after SAD was in the very low frequency region of the blood pressure spectra. The …
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Kinematics and energetics of the mesoscale mid-ocean circulation : MODE
The temporal and spatial variability of low frequency moored temperature and velocity observations, obtained as part of the Mid-Ocean Dynamics Experiment (MODE), are analyzed to study the kinematics and energetics of mesoscale eddies in the ocean. The temporal variability of the low frequency …
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New Way of Generating Electromagnetic Waves Using Permanent Magnet
… data rate, which leads to the use of higher frequency bands and wider bandwidths in modern communication technology research and innovations. However, increasing frequency in many technology areas cannot necessarily be beneficial because of physical constraints. For example, communication …
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Whistler Waves Detection - Investigation of modern machine learning techniques to detect and characterise whistler waves
… electromagnetic pulses that routinely cause very low frequency (VLF) waves to propagate across hemispheres along geomagnetic field lines. VLF antenna receivers can be used to detect these whistler waves generated by these lightning strokes. The particular time/frequency dependence of the …
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Analysis of Heart Rate Variability in Female Patient with Overactive Bladder
… NN intervals)는 대조군과 비교하여 통계적인 차이가 없었다. 심박동수 변이의 frequency domain 지표 분석에서 환자군의 total power (TP), high frequency (HF)는 대조군과 비교하여 통계적으로 유의하게 감소하였고, 이외의 다른 지표인 very low frequency (VLF), low frequency (LF)와 LF/HF ratio에서는 통계학적으로 두 군간의 유의한 차이를 보이지 않았다 결론: 과민성 방광 환자에서 심박동수 변이 지표는 TP, HF에서 대조군에 비하여 통계적으로 …
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A surface integral equation method for dielectrics at low frequencies
… special considerations are needed because of the low frequency breakdown. The augmented technique, a useful remedy for low frequency breakdown of the electric field integral equation is introduced as the background of this thesis. This augmented electric field integral equation provides a simple …
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Low-Frequency Emission Enhancement by Resonant Acoustic Metamaterials
… directional acoustic emission enhancements, at low frequencies as well as broad frequency bands, are highly demanded in audio, medical ultrasonics, and underwater acoustics. Emission enhancement and controlling the directivity of an acoustic source is however restricted to the properties of the …
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Charmonium correlation and spectral functions in quenched lattice QCD at finite temperature
… In particular, our finest lattices have a very small lattice spacing, i.e. $a=0.01$ fm. Using the Maximum Entropy Method we have reconstructed the spectral functions at both temperature below and above the critical temperature. We measured charmonium correlators on our finest lattices with …
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Response variability in ADHD: exploring the possible role of spontaneous brain activity
… with ADHD might not effectively attenuate low frequency resting brain activity from rest to task and that these low frequency oscillations may then intrude onto task performance and cause periodic attention lapses. These periodic attention lapses would manifest as increased variability in …
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Using a high-speed plasma as a conducting channel to enable a novel antenna approach
… conductivity will eliminate tip reflections, allowing this conceptual antenna to radiate more efficiently at low frequencies than existing antennas. This technique offers greater efficiency and wider bandwidth than that of the currently employed frequency-domain matching techniques. First, we …
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Dynamic duty cycle mechnism for mobility in wirless sensor networks
… and these devices have a short-range and a very low frequency. Through a very precise complement, the sensors are small size but at the same time contain sensors as well as radio transmitters and receivers with microprocessors that can implement local data processing that done as well as …
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Analysis of The RING Domain And BRCT Repeats of BRCA1
… homozygous M1717R Brca1 mice, but with a very low frequency (<1%). All Brca1M17171R/M1717R mice produced thus far have been males and they are sterile. Our analysis indicates that the fertility defect is not due to a defect in meiosis. Introduction of the M1717R mutation in a conditional …
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Testing for relationship between diagnostic tests and DC BDV of in-serviced aged stator bars of a hydro generator
… (TVA) tests. The HV breakdown tests included very low frequency (VLF) and DC tests. Despite using this wider range of tests than has been used before, the test results still confirm earlier reports that there are no clear correlations between the different diagnostic tests. There is also no …
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Three-phase five limb transformer responses to geomagnetically induced currents
… two points on the earth's surface leads to the flow of direct current (DC) of very low frequency in the range 0.001 ~ 0.1 Hz. Geomagnetically induced currents enter into the power system through grounded neutrals of power transformers. The potential effects of GIC on transformers are asymmetrical …
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Geophysical Characterisation and Evolutionary Model of the Quaternary sediments in the North Offaly region of Central Ireland
… resistivity, Ground Penetrating Radar (GPR) and Very Low Frequency (VLF). Forward modelling with GPRSIM and RES2DMOD software and geophysical ground truth evaluation in three test sites aided in the selection of the most efficient data collection, processing and interpretation methods, evaluation …
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