Relevant bibliographies by topics / Heating – Noise

Academic literature on the topic 'Heating – Noise'

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Published: 4 June 2021
Last updated: 19 February 2022

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Journal articles on the topic "Heating – Noise"

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Elyutin, P. V., N. S. Maslova, and N. A. Gippius. "Oscillator heating by the colored noise." JETP Letters 90, no. 11 (February 2010): 731–34. http://dx.doi.org/10.1134/s002136400923009x.

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Leibrandt, D., B. Yurke, and R. Slusher. "Modeling ion trap thermal noise decoherence." Quantum Information and Computation 7, no. 1&2 (January 2007): 52–72. http://dx.doi.org/10.26421/qic7.1-2-2.

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We present a detailed analysis of ion heating caused by thermal fluctuation noise in ion traps. The results of the analysis are used to estimate thermal noise ion heating rates for a variety of trap electrode configurations and materials, including recent scalable multiplexed planar ion trap proposals based on silicon VLSI technology. We find that minimizing thermal noise ion heating places severe constraints on the design and materials used for ion traps.
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Ardaravi?ius, L., J. Liberis, A. Matulionis, L. F. Eastman, J. R. Shealy, and A. Vertiatchikh. "Self-heating and microwave noise in AlGaN/GaN." physica status solidi (a) 201, no. 2 (January 2004): 203–6. http://dx.doi.org/10.1002/pssa.200303901.

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Gehm, M. E., K. M. O’Hara, T. A. Savard, and J. E. Thomas. "Dynamics of noise-induced heating in atom traps." Physical Review A 58, no. 5 (November 1, 1998): 3914–21. http://dx.doi.org/10.1103/physreva.58.3914.

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Bühler, M., E. Umlauf, and J. C. Mather. "Noise of a bolometer with vanishing self-heating." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 346, no. 1-2 (July 1994): 225–29. http://dx.doi.org/10.1016/0168-9002(94)90708-0.

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Hite, D. A., K. S. McKay, S. Kotler, D. Leibfried, D. J. Wineland, and D. P. Pappas. "Measurements of trapped-ion heating rates with exchangeable surfaces in close proximity." MRS Advances 2, no. 41 (2017): 2189–97. http://dx.doi.org/10.1557/adv.2017.14.

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ABSTRACTElectric-field noise from the surfaces of ion-trap electrodes couples to the ion’s charge causing heating of the ion’s motional modes. This heating limits the fidelity of quantum gates implemented in quantum information processing experiments. The exact mechanism that gives rise to electric-field noise from surfaces is not well-understood and remains an active area of research. In this work, we detail experiments intended to measure ion motional heating rates with exchangeable surfaces positioned in close proximity to the ion, as a sensor to electric-field noise. We have prepared samples with various surface conditions, characterized in situ with scanned probe microscopy and electron spectroscopy, ranging in degrees of cleanliness and structural order. The heating-rate data, however, show no significant differences between the disparate surfaces that were probed. These results suggest that the driving mechanism for electric-field noise from surfaces is due to more than just thermal excitations alone.
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Fujiwara, S., and S. Hasegawa. "Estimation of the heating rate of ions due to laser fluctuations when implementing quantum algorithms." Quantum Information and Computation 7, no. 7 (September 2007): 573–83. http://dx.doi.org/10.26421/qic7.7-1.

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We analyze numerically the heating of trapped ions due to laser intensity and phase fluctuations when implementing Grover's algorithm and the Quantum Fourier Transform. For a simpler analysis we assume that the stochastic processes are white noise processes and average over each noise as in [Phys. Rev. A. \textbf{57}, 3748, (1998)]. We investigate the fidelity and the heating rate for these algorithms using parameters estimated from experiments, and we can see the order of magnitude difference in the heating rate depending on the quantum algorithms.
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Liu, Yi, and Percy Wang. "Low noise blower fan for heating and cooling applications." Journal of the Acoustical Society of America 134, no. 5 (November 2013): 4029. http://dx.doi.org/10.1121/1.4830711.

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Hacyan, S., and R. J uregui. "Noise-induced heating of squeezed states in atom traps." Journal of Optics B: Quantum and Semiclassical Optics 5, no. 2 (February 26, 2003): 138–44. http://dx.doi.org/10.1088/1464-4266/5/2/304.

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Brent Becker, J., and G. Nunes. "Noise and heating considerations in bridges for mesoscopic measurements." Czechoslovak Journal of Physics 46, S5 (May 1996): 2759–60. http://dx.doi.org/10.1007/bf02570366.

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Dissertations / Theses on the topic "Heating – Noise"

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Gungor, Faruk Emre. "Computer Aided Noise Prediction In Heating, Ventilating And Air Conditioning Systems." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1210087/index.pdf.

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This thesis aims at preparing a user-friendly software tool for the prediction and analysis of the noise generated in Heating, Ventilating and Air Conditioning (HVAC) Systems elaborating the standardized prediction formulae and data coming from the research studies. For the analysis portion of the software, different types of indoor noise criteria are introduced and implemented in the software to ease the investigation of the level and the quality of the sound perceived by the occupant in a room through such criteria. General software structure and implementation of HVAC elements are explained by different userinterface samples in the thesis. Several case studies are presented to demonstrate the capabilities of the tool prepared in VISUAL BASIC programming language within the scope of the study.
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Michael, Michalakis Christaki. "Noise generation by duct terminations." Thesis, London South Bank University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240206.

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Trinder, M. C. J. "Active noise control in finite length ducts." Thesis, University of Essex, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371924.

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Kwan, E. K. M. "The use of inlet valve control and air heating for reducing diesel engine noise." Thesis, Brunel University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234054.

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Neale, James Richard Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "Experimental and numerical investigation of noise generation from the expansion of high velocity HVAC flows on board ocean going fast ferries." Awarded by:University of New South Wales. School of Mechanical and Manufacturing Engineering, 2006. http://handle.unsw.edu.au/1959.4/28371.

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This thesis details a study of strategies used to limit the flow generated noise encountered in the outlet diffusers of high velocity heating, ventilation and air conditioning (HVAC) duct systems. The underlying noise rating criterion is drawn from the specifications covering ocean going aluminium fast ferries. Although directed primarily towards the fast ferry industry the results presented herein are applicable to other niche high velocity HVAC applications. Experimental tests have been conducted to prove the viability of a high velocity HVAC duct system in meeting airflow requirements whilst maintaining acceptable passenger cabin noise levels. A 50 mm diameter circular jet of air was expanded using a primary conical diffuser with a variety of secondary outlet configurations. Noise measurements were taken across a velocity range of 15 to 60 m/s. An optimum outlet design has been experimentally identified by varying the diffuser angle, outlet duct length and the termination grill. A 4 to 5 fold reduction in required duct area was achieved with the use of a distribution velocity of 20 to 30 ms-1, without exceeding the prescribed passenger cabin noise criteria. The geometric configuration of the diffuser outlet assembly was found to have a pronounced effect on the noise spectrum radiating from the duct outlet. The development of a numerical model capable of predicting the flow induced noise generated by airflow exiting a ventilation duct is also documented. The model employs a Large Eddy Simulation (LES) CFD model to calculate the turbulent flow field through the duct diffuser section and outlet. The flow-generated noise is then calculated using a far field acoustic postprocessor based on the Ffowcs-Williams and Hawkings integral based formulation of Lighthill???s acoustic analogy. Time varying flow field variables are used to calculate the fluctuating noise sources located at the duct outlet and the resulting far field sound pressure levels. This result is then used to calculate the corresponding far field sound intensity and sound power levels. The numerical acoustic model has been verified and validated against the measured experimental results for multiple outlet diffuser configurations.
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Dieckmann, Mark Eric. "A survey of elementary plasma instabilities and ECH wave noise properties relevant to plasma sounding by means of particle in cell simulations." Thesis, University of Warwick, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327557.

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Michaud, Alexander Page. "Experimental Investigation of Reflection of Airborne Noise at Duct Terminations." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16209.

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Noise between 25-500 Hz is a common problem in Heating, Ventilating, and Air Conditioning (HVAC) systems. The American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) Handbook lists values of end reflection loss (ERL), a frequency dependent parameter describing energy reflected back up a duct at a termination impedance, to help engineers design and account for noise. The ASHRAE Handbook does not account for common termination variations and only lists ERL values using octave bands down to 63 Hz. This thesis experimentally determined the ERL of a variety of rectangular duct configurations and termination conditions between 25-500 Hz. This research also compared experimental ERL results with analytic predictions and ASHRAE Handbook values. Seven duct sizes were tested, from 6X6 to 18X54 inches. Duct termination baffle hardness was varied between acoustically hard (plywood) and soft (ceiling tiles) for the 6X6, 6X10, and 6X18 ducts. Five duct termination distances above the termination baffle were tested, between flush and 1D for the 6X10 and 6X18 ducts and between flush and 5D for the 6X6 duct, where D equals the duct s effective diameter. Diffusers and flex duct configurations were installed at the end of the rigid duct to test their effect on ERL on the 6X6, 6X10, and 6X18 ducts. ERL was determined using an adaptation of the ASTM E1050 Standard, an application of the two-microphone impedance tube method. Experimental results closely conformed to analytic predictions and are an improvement over ASHRAE Handbook ERL values. The results indicate that baffle hardness has a negligible impact on ERL, which contradicts the ASHRAE assumption that diffusers that terminate in a suspended lay-in acoustic ceiling can be treated as terminating in free space. Termination distance above the baffle has a negligible impact on ERL at distances less than six inches for the 6X6 duct. Termination distances above the baffle greater than six inches exhibit limited free space ERL behavior for the 6X6 duct. The use of flex duct greatly reduces low frequency ERL and this is not accounted for by the ASHRAE Handbook. The impact from flex duct usage also negates any influence from downstream termination variations.
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Chew, Gilbert. "Projectile nose heating in the Ram accelerator /." Thesis, Connect to this title online; UW restricted, 1995. http://hdl.handle.net/1773/9957.

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Bergr, Josef. "Návrh a optimalizace provozu tepelného čerpadla." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227156.

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The aim of the thesis "Design and optimization of the heat pump" is the project documentation for building permits, finding a suitable source of heat and cold. The problem is solved for a Tesco hypermarket. The device is designed to meet the health, performance and functional requirements for indoor climate. The task of this device is to transport fresh air into the interior cover heat losses in winter and coverage heat gains during the summer. The theoretical part deals with the problem of heat pumps. Special mention is about heat pump air x air. Calculation and design part is a specific proposal, two air conditioners and optimizing for winter. The experimental part deals with the processing of data on existing rooftop units.
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Raška, Michal. "Diagnostika PN přechodu křemíkových vysokonapěťových usměrňovacích diod pomocí šumu mikroplazmatu." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233496.

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The doctoral thesis deals with diagnostics of local defects in PN junctions and brings new information about microplasma noise behaviour and its usage for the temperature changes detection inside PN junctions. Defects in PN junctions are the source of microplasma noise. There were deviations observed in microplasma noise from the common known rectangle shape pulses during the measurements. These deviations were correlated with the temperature change directly in the defect area and in the defect area surroundings. Generation and recombination coefficients are commonly thought to be constant. However, these coefficients were observed to be not stable with time and this effect is explained in this work. The doctoral thesis then focuses on the PN junction parameters determination in the case when it is not possible to define unambiguously whether it is abrupt or linearly graded PN junction. The most significant parameters which are to be determined are barrier capacity, diffusion voltage and depleted area width in dependence on the voltage. The correlation between local avalanche discharge in PN junction and negative differential resistance appearance on VA characteristics of reverse-biased diode was qualitatively verified. The last important point in the work is computer modelling of temperature behaviour in the defect area and its surroundings during local avalanche breakdown. Thus the method of real diodes heating area parameters determination was introduced.
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Books on the topic "Heating – Noise"

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American Society of Heating, Refrigerating and Air-Conditioning Engineers., ed. A practical guide to noise and vibration control for HVAC systems. Atlanta, Ga: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., 1993.

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E, Schaffer Mark. A practical guide to noise and vibration control for HVAC systems. 2nd ed. Atlanta, GA: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, 2011.

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E, Schaffer Mark. A practical guide to noise and vibration control for HVAC systems. Atlanta, Ga: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., 1991.

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E, Schaffer Mark. A practical guide to noise and vibration control for HVAC systems. Atlanta, Ga: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., 1991.

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Kwan, Eric Kong Meng. The use of inlet valve control and air heating for reducing diesel engine noise. Uxbridge: Brunel University, 1989.

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Reynolds, Douglas D. Algorithms for HVAC acoustics. Atlanta, Ga: American Society of Heating, Refrigerating and Air-Conditioning Engineers, 1991.

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Noise in heating installations. Stuttgart: IRB Verlag, 1989.

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Chartered Institution of Building Services Engineers., ed. Noise and vibration control for HVAC. London: CIBSE, 2002.

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-H, Shih S., Mankbadi R. R, and United States. National Aeronautics and Space Administration., eds. Numerical simulation of the effect of heating on supersonic jet noise. [Washington, DC: National Aeronautics and Space Administration, 1997.

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-H, Shih S., Mankbadi R. R, and United States. National Aeronautics and Space Administration., eds. Numerical simulation of the effect of heating on supersonic jet noise. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Book chapters on the topic "Heating – Noise"

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Price, A. J., and Malcolm J. Crocker. "Noise Control in Heating and Ventilating Systems." In Noise and Noise Control, 137–79. CRC Press, 2018. http://dx.doi.org/10.1201/9781351074995-3.

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"Heating-Related Oscillations and Noise." In Flow-induced Vibrations, 277–310. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-08-098347-9.00006-0.

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"Noise control." In Faber & Kell's Heating & Air-conditioning of Buildings, 651–68. Routledge, 2008. http://dx.doi.org/10.4324/9780080557649-32.

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Lu, Gaoming, and Jianjun Zhou. "Experimental Investigation on the Effect of Microwave Heating on Rock Cracking and Their Mechanical Properties." In Microwave Heating - Electromagnetic Fields Causing Thermal and Non-Thermal Effects. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95436.

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Due to various advantages including high efficiency, energy-saving, and having no secondary pollution (no dust or noise), the technology of microwave-induced fracturing of hard rock has been considered as a potential method for rock fracturing and breaking. Realizing microwave-assisted mechanical rock cutting using the microwave-induced hard rock fracturing technique can prolong the mechanical life and improve the efficiency of rock-breaking operations. For example, to realize microwave-assisted TBM excavation for hard rock tunnel. At present, this technology is still in the laboratory research stage. By summarizing the research results of relevant scholars in this field, this paper generalizes the mechanism of microwave heating of rock, microwave heating system, heating characteristics, and the effect of microwave heating on rock cracking and mechanical properties. Microwave heating causes microscopic cracks on the surface of the rock and microscopic cracks inside the rock. The higher the microwave power, the longer the irradiation time, the more serious the cracks propagation. Uniaxial compressive, Brazilian tensile, and point load strengths all decreased with increasing microwave irradiation time at rates that were positively related to the power level. The conventional triaxial compressive strength of basalt samples decreased linearly with microwave irradiation time, and the higher the confining pressure, the smaller the reduction in the strength of basalt samples after microwave treatment. In addition, the elastic modulus and Poisson’s ratio of basalts decreased in a quasi-linear manner with the growth of microwave irradiation time under uniaxial compression. While microwave irradiation has a slight influence on elastic modulus and Poisson’s ratio under triaxial compression. The cohesion decreases with increasing microwave irradiation time and shows an approximately linear decrease over time.
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Damer, Seán. "Craigbank: Amateur Dramatics?" In Scheming, 103–23. Edinburgh University Press, 2018. http://dx.doi.org/10.3366/edinburgh/9781474440561.003.0006.

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This chapter discusses the development of an experimental “Ordinary” scheme built under the provisions of the 1946 Housing Act. The experiment was a district central heating system, which predicated high rents. Tenants were largely self-selecting in that they had to have enough regular income to pay these high rents. But the houses were built in tenemental form with flat roofs, and there were numerous complaints about poor noise insulation and leaks. Although its external perception was “élite,” it was still a substantially skilled manual working-class scheme, but one with several active voluntary organisations, and very popular with its tenants.
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Robson, Matthew. "7 T cardiac imaging." In The EACVI Textbook of Cardiovascular Magnetic Resonance, edited by Massimo Lombardi, Sven Plein, Steffen Petersen, Chiara Bucciarelli-Ducci, Emanuela R. Valsangiacomo Buechel, Cristina Basso, and Victor Ferrari, 620–23. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198779735.003.0062.

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By increasing the field strength of the magnet used for magnetic resonance imaging (MRI), the available signal from the patient is enhanced, and this basic physics principle has driven the clinical MRI market to ever higher field strengths. Seven Tesla (7 T) scanners yield 4-5 times more signal than 1.5 T scanners; this signal-to-noise ratio increase facilitates high-resolution imaging, faster imaging when using accelerated techniques such as SENSE and GRAPPA, and greater sensitivity to low-concentration metabolites. Magnetic resonance spectroscopy acquisitions also benefit, owing to the greater chemical shift dispersion at ultra-high field. A significant difficulty is due to the radiofrequency excitation required that oscillates at 300 MHz, which results in destructive interference of the excitation fields and heating of the patient, and hence requires expensive additional hardware. While 7 T presents a great opportunity to cardiovascular MRI research, it is not yet a routine clinical tool, owing to the compound challenges of high cost, limited availability, and the difficulties of radiofrequency excitation at 300 MHz.
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Atkinson, Martin E. "The respiratory system." In Anatomy for Dental Students. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199234462.003.0011.

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Oxygen derived from the air is essential for providing energy to drive the metabolic processes in cells and tissues. Air is drawn into and expelled from the body through the respiratory system by the process of ventilation. Within the respiratory system, gaseous exchange takes place between air and blood in the lungs. This is respiration in its true sense; oxygen enters the blood and carbon dioxide leaves it. The activities of the respiratory system must be regulated to ensure adequate oxygen supplies and clearance of carbon dioxide to meet the functional demands of the body. The respiratory and cardiovascular systems work in concert to maintain homeostasis and share several control mechanisms. The respiratory system also provides the driving force for production of speech and modifying sounds during speech. Anatomically, the respiratory system consists of a series of air passages that terminate in the lungs where gaseous exchange takes place across the thin walls of individual alveoli within them. The air passages are supported by bone or cartilage to prevent them from collapsing when air pressure is reduced. A schematic diagram of the respiratory tract is shown in Figure 5.1. In succession, the nose, pharynx, larynx, trachea, and bronchial tree constitute the conducting portion of air passages and the lung alveoli form the respiratory portion where gaseous exchange takes place. Clinically, the air passages as far as the larynx are known as the upper respiratory tract (URT) and the passages below the larynx and the lungs are the lower respiratory tract (LRT). Air is drawn into the body through the nose. The nose is more than a simple air passage; it has important functions in cleaning, warming, and moistening air. Air is filtered by hairs at the entrance to the nose, warmed by heat exchange with the abundant blood vessels in the mucosa of the nasal cavities, and humidified by fluid evaporating from mucus secreted by the lining mucosa. Figure 5.2A shows how bone in the lateral walls of the nasal cavities is folded to increase the surface area available and thus increase their efficiency of heating and humidification. The mucosa lining the respiratory portion has an outer covering known as respiratory epithelium although its full description, pseudostratified ciliated columnar epithelium with goblet cells, is more informative.
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P. Spiridakos, Dimitrios, Nicholas C. Markatos, and Despoina Karadimou. "Mathematical Modeling of Aerodynamic Heating and Pressure Distribution on a 5-Inch Hemispherical Concave Nose in Supersonic Flow." In Computational Models in Engineering. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.91041.

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"expansion with a heterodyne laser interferometer (laser probe). Demodulation is obtained with specific electronics. The magnitude and phase of the surface vibration are given with a second lock-in amplifier (lock-in amplifier 1) and stored in a microcomputer that also drives the scanning units. With this multi-acquisition microscope, the typical duration of an experiment in order to obtain a set of five low noise images is about 15 minutes. The resolution of the SThEM is given by the size at the photothermal source (radius of the optical beam: 5 /xm here). 4.1. Application to the study of thin films The first example concerns the observation of subsurface thin layers. In order to demonstrate the capacity for subsurface investigation we successively vapour deposited a 200 nm thick SiC>2 and 100 nm thick aluminium layers onto a polycrystalline nickel substrate (Fig. 8a). The bright strip on the right part of the image (Fig. 8b) reveals the presence of the subsurface SiC>2 layer which is optically invisible. This image has been obtained at 220 kHz modulation frequency of the excitation beam. The image contrast corresponds to about 25° phase shift. As the SThEM makes it possible to observe the subsurface we decided to use it for the detection of thin films delamination. We used a 1 /xm thick DLC film deposited on a steel substrate. Several lines of Vickers indentations were performed under an applied load of 4.5N. A different spacing (25 to 140 pim) between indentations has been taken for each line. The SEM and thermoelastic images of the indentations spaced 25 /xm are shown in Fig. 9. Due to the film delamination, an optically invisible bright area between the indentations (Fig. 9a) was observed by the SThEM at 100 kHz operating frequency (Fig. 9b). It is an indication of the excessive heating resulting from the film delamination. The latter is due to the tensile residual stresses which develop around each indentation. The bright area (film delamination) could not be detected both in the case of a single indentation or when the spacing between indentations was higher than 40 /xm. In the latter case." In Adhesion Aspects of Thin Films, Volume 1, 210–12. CRC Press, 2014. http://dx.doi.org/10.1201/b11971-32.

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Conference papers on the topic "Heating – Noise"

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Lisboa de Souza, A. A., J. C. Nallatamby, M. Prigent, and J. Obregon. "Impact of self-heating in LF noise measurements with voltage amplifiers." In SPIE Fourth International Symposium on Fluctuations and Noise, edited by Massimo Macucci, Lode K. Vandamme, Carmine Ciofi, and Michael B. Weissman. SPIE, 2007. http://dx.doi.org/10.1117/12.724665.

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Sinha, Swarna, and Sanjiva K. Lele. "Effect of Heating Supersonic Jet Noise: Inferences from Available Data." In 23rd AIAA/CEAS Aeroacoustics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-3027.

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Batista, Adriano A. "Parametrically driven oscillators with added noise: heating and thermal squeezing." In DINCON 2013 – Conferência Brasileira de Dinâmica, Controle e Aplicações. SBMAC, 2013. http://dx.doi.org/10.5540/03.2013.001.01.0026.

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Bodony, Daniel. "Heating Effects on the Structure of Noise Sources of High-Speed Jets." In 47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-291.

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Luo, Zihan, Jun Liu, Wenyong Zhou, and Zhanfei Chen. "An Improved 1/f Noise Model for FinFETs Accommodating Self-Heating Behaviors." In 2018 IEEE International Conference on Integrated Circuits, Technologies and Applications (ICTA). IEEE, 2018. http://dx.doi.org/10.1109/cicta.2018.8706065.

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Herther, Joseph C., and Stephen P. Gent. "Computational Aeroacoustic Analysis of a Heating Coil Within a Ventilation Duct." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21603.

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This study computationally investigates the sound generation of air flow through a heating coil within a ventilation duct. Noise sources originating from unsteady flow through the centrifugal fan, heating coil, and ducting are identified with steady RANS techniques using a commercially available CFD solver. Built-in aeroacoustic modules are used to refine the mesh to resolve acoustic frequencies in the computational model. Sound spectral analysis is performed in the near field. With the continued exponential progression of technology, computational numerical models become increasingly more applicable and practical to a larger variety of engineering problems. Traditionally, aeroacoustic analysis has been performed on noise sources such as aircraft. However, more interest into acoustic source modeling in other fields has expanded. For example, wind turbines, automotive sources such as rear view mirrors, HVAC systems, and other noise generating devices. As the population continues to grow it is of interest to characterize the acoustics of HVAC equipment, in the future, to prevent unwanted noise within buildings. Furthermore, the inquiry is to question the practicality of computational aeroacoustic methods, which are known to be computationally intensive, for industrial use in HVAC design.
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7

Nistor, Ciprian Gheorghe. "Analysis of noise and heating for three-phase induction motor fed by inverter." In 2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM). IEEE, 2014. http://dx.doi.org/10.1109/optim.2014.6850931.

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8

Bake, Friedrich, Ulf Michel, and Ingo Roehle. "Investigation of Entropy Noise in Aero-Engine Combustors." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90093.

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Strong evidence is presented that entropy noise is the major source of external noise in aero-engine combustion. Entropy noise is generated in the outlet nozzles of combustors. Low frequency entropy noise — which was predicted earlier in theory and numerical simulations — was successfully detected in a generic aero-engine combustion chamber. It is shown that entropy noise dominates even in the case of thermo-acoustic resonances. In addition to this, a different noise generating mechanism was discovered that is presumably of even higher relevance to jet engines: There is strong evidence of broad band entropy noise at higher frequencies (1 kHz to 3 kHz in the reported tests). This unexpected effect can be explained by the interaction of small scale entropy perturbations (hot spots) with the strong pressure gradient in the outlet nozzle. The direct combustion noise of the flame zone seems to be of minor importance for the noise emission to the ambiance. The combustion experiments were supplemented by experiments with electrical heating. Two different methods for generating entropy waves were used, a pulse excitation and a sinusoidal excitation. In addition, high-frequency entropy noise was generated by steady electrical heating.
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9

Bake, Friedrich, Ulf Michel, and Ingo Roehle. "Fundamental Mechanism of Entropy Noise in Aero-Engines: Experimental Investigation." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27300.

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Entropy noise caused by combustors increases rapidly with rising Mach number in the nozzle downstream of the combustion chamber. This is experimentally shown with a dedicated test facility, in which entropy waves are generated in a controlled way by unsteady electrical heating of fine platinum wires immersed in the flow. Downstream of the heating module called Entropy Wave Generator (EWG) the pipe flow is accelerated through a convergent-divergent nozzle with a maximum Mach number of 1.2 downstream of the nozzle throat. Parameters like mass flux of the flow, nozzle Mach number, amount of heating energy, excitation mode (periodic, pulsed or continuously), and propagation length between Entropy Wave Generator and nozzle have been varied for the analysis of the generated entropy noise. The results are compared with the results of a one-dimensional theory found in early literature.
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10

Panda, Jayanta, Richard Seasholtz, Kristie Elam, Amy Mielke, and Dennis Eck. "Effect of Heating on Turbulent Density Fluctuations and Noise Generation from High Speed Jets." In 10th AIAA/CEAS Aeroacoustics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-3016.

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