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 36 for “"electrical noise"”.
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Electrical noise in the spin-glass AuFe
Measurements of electrical resistance fluctuations have been performed on the spin-glass AuFe in order to compare with prior results in CuMn. Macroscopic AuFe samples showed a sharp increase in the noise with the onset of the noise at a temperature corresponding to the peak in the magnetic …
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Electrical noise study of spin glass dynamics in mesocopic CuMn
The electrical resistance of the archetypal spin glass CuMn is surprisingly sensitive to small changes in the spin configuration. This enhanced sensitivity results from long-range electron quantum interference at low temperatures. Due to this effect, substantial resistance noise is produced by …
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Electrical noise studies of the re-entrant spinglass nickel-manganese
… transverse to the overall ferromagnetic moment. Electrical noise and other transport data presented here, however, as well as a careful review of all the literature, suggests a different picture for at least thin film systems with partial short-range atomic order. In this picture it is clusters …
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Electrical noise study of spin glass dynamics in mesoscopic copper manganese
The electrical resistance of the archetypal spin glass $\underline{\rm Cu}$Mn is surprisingly sensitive to small changes in the spin configuration. This enhanced sensitivity results from long-range electron quantum interference at low temperatures. Due to this effect, substantial resistance noise …
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Electrical noise model for detection circuitry of an NMR-based formation evaluation Tool
… are often of the same amplitude as the noise generated by the instruments. Designers of these devices are thus usually faced with the challenging task of improving the sensitivity of the measurement process either by reducing the noise generated by the system or by boosting the signal …
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Tolimosios infraraudonosios srities optoelektronikos įtaisų žemo dažnio triukšmo charakteristikos /
… operational efficiency, and low-frequency noise characteristics (1/𝑓 noise, generation-recombination noise, shot noise, and thermal noise) of AlGaAs and GaAsBi laser diodes. The goal is to contribute to the development of efficient, reliable, and versatile laser systems that are suitable …
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Fibre Bragg grating temperature sensors for high-speed machining applications
… based, and often suffer from excessive electrical noise on the signal. This thesis presents a number of novel and existing optical sensing devices that overcome this limitation and also, in some cases, offer greater performance. The optical sensors are fibre Bragg grating based and the …
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The development of instrumentation for the support of skin friction and heat flux measurements
… instrumentation is battery powered to minimize noise levels and to maintain instrumentation portability. A high-quality instrumentation amplifier, a voltage regulator, and a custom-designed circuit board have been combined to produce an instrumentation package which is stable and durable. The …
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High Angular Momentum Rydberg Wave Packets
… effects due to background gas collisions and electrical noise are also detailed. Quantized classical trajectory Monte-Carlo simulations are introduced and agree remarkably well with experimental results.
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Unsteady surface heat flux and temperature measurements
… illustrate the effects of data processing on electrical noise present in the actual signal. The effect of flame unsteadiness is also shown, especially in the time-resolved heat flux measurements, which gives insight into the behavior of a propane torch. One application is for development of …
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Development, Validation, and Application of Electromyometrial Imaging (EMMI) to Noninvasively Image Uterine Contractions
… can measure uterine electrical activity using a few electrodes on the abdomen, this method lacks sufficient spatial resolution and coverage and thus cannot accurately measure the exact location of electrical initiation and location-specific propagation patterns of …
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Comparison of tripolar and traditional recording of the pattern-reversal visual evoked potential: signal and noise
… is highly susceptible to non-neural sources of electrical noise and has limited spatial resolution. Tripolar concentric ring electrodes (TCREs) provide an EEG measure (tripolar EEG; tEEG) designed to reduce these issues. Many studies using tEEG via TCRE systems have demonstrated successful noise …
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Towards improving the quantum coherence in Ion microtraps
… traps are presented. Surface contamination, noise on DC sources and instabilities in magnetic field are all potential sources of decoherence that are investigated. Spectroscopy on a single ion aswell as a two ion string using 88Sr+ is then demonstrated. Hydrocarbon contamination on electrode …
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EXCESS NOISE STUDIES ON AVALANCHE PHOTODIODES
An experimental apparatus for carrying out electrical noise measurements on various semiconductor devices over a broad temperature range was constructed. Commercially available avalanche photodiodes (APDs) could be illuminated over the wavelengths 420 nm to 2 gm and the noise current spectrum from …
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The spectroscopy of bound and predissociating Rydberg states of NO in external electric fields
… chamber and investigation into sources of electrical noise required to achieve this is discussed. It is shown that the rotational quantum state composition of field-ionised molecules can be controlled by varying the slew rate of the applied electric field.
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Design and analysis of a monolithic flexure atomic force microscope
… 450 Hz -3db closed loop bandwidth and 0.249 RMS noise positioning. A new probe named after its inventor Dr. Terunobu Akiyama is implemented in a feedback control system that adjusts the displacement of the stage in order to maintain a constant gap between the probe and the sample. The system …
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Dynamic Pressure Sensing for the Flight Test Data System
… to reduce the effect of inherent and induced electrical noise, while two-sensor correlation was tested and shown to be effective at removing certain types of noise. Total power consumption for the FTDS-K in a representative mission is 208 mW, which translates to an operational endurance of 9 …
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Solid-state nanopore sensors for nucleic acid analysis
… of nanopore performance in terms of electrical noise, mechanical robustness and materials analysis is provided, and the functionality of this technology in experimental DNA biophysics is explored. A framework for the application of this technology to medical diagnostics and sequencing …
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The Effects of Physiological Stress on Brain-Computer Interface Systems
… state. Factors such as muscle movement, electrical noise, workload, fatigue, and emotional state, can negatively contribute to the performance of a BCI device when being used in a real-world environment. This work investigates how a user's physiological stress level may impact the …
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Heterogeneous integration of graphene and Si CMOS for gas sensing applications
… high surface-to-volume ratio, and low electrical noise. In this dissertation, a graphene gas sensor fully integrated with silicon CMOS platform is presented, and its performance for detecting NO₂ and NH₃ gas molecules is investigated. This integration helps benefit the high gas …
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