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Добірка наукової літератури з теми "Microwave field"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Microwave field"

Zubair, Mukarram, Rebecca Ferrari, Omar Alagha, Nuhu Dalhat Mu’azu, Nawaf I. Blaisi, Ijlal Shahrukh Ateeq, and Mohammad Saood Manzar. "Microwave Foaming of Materials: An Emerging Field." Polymers 12, no. 11 (October 25, 2020): 2477. http://dx.doi.org/10.3390/polym12112477.

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In the last two decades, the application of microwave heating to the processing of materials has to become increasingly widespread. Microwave-assisted foaming processes show promise for industrial commercialization due to the potential advantages that microwaves have shown compared to conventional methods. These include reducing process time, improved energy efficiency, solvent-free foaming, reduced processing steps, and improved product quality. However, the interaction of microwave energy with foaming materials, the effects of critical processing factors on microwave foaming behavior, and the foamed product’s final properties are still not well-explored. This article reviews the mechanism and principles of microwave foaming of different materials. The article critically evaluates the impact of influential foaming parameters such as blowing agent, viscosity, precursor properties, microwave conditions, additives, and filler on the interaction of microwave, foaming material, physical (expansion, cellular structure, and density), mechanical, and thermal properties of the resultant foamed product. Finally, the key challenges and opportunities for developing industrial microwave foaming processes are identified, and areas for potential future research works are highlighted.

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Nanayakkara, T. R., R. L. Samaraweera, A. Kriisa, U. Kushan Wijewardena, S. Withanage, C. Reichl, W. Wegscheider, and R. G. Mani. "Influence of microwave photo-excitation on the transport properties of the high mobility GaAs/AlGaAs 2D electron system." MRS Advances 4, no. 61-62 (2019): 3347–52. http://dx.doi.org/10.1557/adv.2020.30.

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ABSTRACTWe examined the influence of the microwave power on the diagonal resistance in the GaAs/AlGaAs two dimensional electron system (2DES), in order to extract the electron temperature and determine microwave induced heating as a function of the microwave power. The study shows that microwaves produce a small discernable increase in the electron temperature both at null magnetic field and at finite magnetic fields in the GaAs/AlGaAs 2DES. The heating effect at null field appears greater in comparison to the examined finite field interval, although the increase in the electron temperature in the zero-field limit appears smaller than theoretical predictions.

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Mogildea, Marian, George Mogildea, Valentin Craciun, and Sorin I. Zgura. "The Effects Induced by Microwave Field upon Tungsten Wires of Different Diameters." Materials 14, no. 4 (February 22, 2021): 1036. http://dx.doi.org/10.3390/ma14041036.

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The effects induced by microwave field upon tungsten wires of different diameters were investigated. Tungsten wires with 0.5 and 1.0 mm diameters were placed in the focal point of a single-mode cylindrical cavity linked to a microwave generator and exposed to microwave field in ambient air. The experimental results showed that the 0.5 mm diameter wire was completely vaporized due to microwaves strong absorption, while the wire with 1 mm diameter was not ignited. During the interaction between microwaves and tungsten wire with 0.5 mm diameter, a plasma with a high electronic excitation temperature was obtained. The theoretical analysis of the experiment showed that the voltage generated by metallic wires in interaction with microwaves depended on their electric resistance in AC and the power of the microwave field. The physical parameters and dimension of the metallic wire play a crucial role in the ignition process of the plasma by the microwave field. This new and simple method to generate a high-temperature plasma from a metallic wire could have many applications, especially in metal oxides synthesis, metal coatings, or thin film deposition.

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Sun, Xiaohe, Changyuan Zhai, Shuo Yang, Haolin Ma, and Chunjiang Zhao. "Simulations and Experiments of the Soil Temperature Distribution after 2.45-GHz Short-Time Term Microwave Treatment." Agriculture 11, no. 10 (September 27, 2021): 933. http://dx.doi.org/10.3390/agriculture11100933.

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Microwave treatment is a green and pollution-free soil disinfection method. The application of microwaves to disinfect soil before cultivation is highly important to increase crop yields and protect the ecological environment. The electromagnetic field is an important parameter influencing the soil temperature field in the process of microwave soil treatment, and the change in soil temperature directly affects soil disinfection. Therefore, this article carried out research on the heating pattern in North China loess due to microwave treatment. First, COMSOL software was employed to simulate the microwave soil treatment process to analyze microwave penetration into soil. Second, with the application of microwaves at the designed frequency produced with a 2.45-GHz tunable microwave generating microdevice, soil with water contents of 0%, 10%, 20%, and 30% was treated for 10~60 s (at 10-s time intervals), and experiments on the influence of the microwave output power, treatment time, and soil moisture content on the soil temperature were performed via the controlled variable method. The simulation results indicate that with increasing soil moisture content, the microwave frequency inside the soil model increases, and the electric field intensity value decreases in the model at the same depth. After microwaves traverse through the 20-cm soil model, the incident field strength is three orders of magnitude lower than the outgoing field strength. The results of the microwave soil treatment experiment reveal that: (1) Compared to microwave output power levels of 1.8 and 1.6 kW, a level of 2 kW is more suitable for microwave soil disinfection. (2) After treatment, the highest temperature occurs on the soil surface, not within the soil. (3) The location of the highest soil internal temperature after microwave treatment increasingly approaches the soil surface with increasing soil moisture content, and the microwave output power does not affect the location of the highest soil internal temperature. Combining the electromagnetic field simulation and microwave soil treatment experiment results, it was found that the higher the field strength is, the higher the temperature value, and the highest soil internal temperature after microwave treatment often occurs at the first electromagnetic wave peak.

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Xing, Jian Yu, Xiu Ling Song, Bo Bai, Shao Kun Lu, and Hai Peng Liu. "Investigation of Microwave Field Selective Heating on Two-Phase System." Applied Mechanics and Materials 448-453 (October 2013): 3005–8. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3005.

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Microwaves represent an alternative way of power input into distillation process. Through dielectric heating, reaction mixtures are homogenously heated without contact to a wall. Reaction times are significantly reduced compared to conventionally (thermally) heated systems while maintaining selectivity. In this paper, microwave field select heating on two-phase system has been investigated numerically and experimentally. Temperature increasing, heat transfer and evaporation during heating process were analyzed. The possibility of microwave used for distillation was examined and proposed.

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Dutta, S. K., C. P. Vlahacos, D. E. Steinhauer, Ashfaq S. Thanawalla, B. J. Feenstra, F. C. Wellstood, Steven M. Anlage, and Harvey S. Newman. "Imaging microwave electric fields using a near-field scanning microwave microscope." Applied Physics Letters 74, no. 1 (January 4, 1999): 156–58. http://dx.doi.org/10.1063/1.123137.

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Fursey, George N. "Field emission in a microwave field." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 13, no. 2 (March 1995): 558. http://dx.doi.org/10.1116/1.588354.

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Hong, Yoon-Ki, Roger Stanley, Juming Tang, Lan Bui, and Amir Ghandi. "Effect of Electric Field Distribution on the Heating Uniformity of a Model Ready-to-Eat Meal in Microwave-Assisted Thermal Sterilization Using the FDTD Method." Foods 10, no. 2 (February 3, 2021): 311. http://dx.doi.org/10.3390/foods10020311.

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Microwave assisted thermal sterilization (MATS) is a novel microwave technology currently used in the commercial production of ready-to-eat meals. It combines surface heating of high-temperature circulation water with internal microwave heating in cavities. The heating pattern inside the food packages in a MATS process depends heavily on the electric field distribution formed by microwaves from the top and bottom windows of the microwave heating cavities. The purpose of this research was to study the effect of the electric field on 922 MHz microwave heating of ready-to-eat meals as they moved through the microwave chamber of a pilot-scale MATS system using the finite-difference time-domain (FDTD) method. A three-dimensional numerical simulation model was developed as a digital twin of the MATS process of food moving through the microwave chamber. The simulation showed that the electric field intensity of the MATS microwave cavity was greatest on the surface and side edge of the cavity and of the food. There was a strong similarity of the experimental heating pattern with that of the electric field distribution simulated by a computer model. The digital twin modeling approach can be used to design options for improving the heating uniformity and throughput of ready-to-eat meals in MATS industrial systems.

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Lann, A. F., M. Golosovsky, D. Davidov, and A. Frenkel. "Microwave near-field polarimetry." Applied Physics Letters 75, no. 5 (August 2, 1999): 603–5. http://dx.doi.org/10.1063/1.124454.

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Nilsson, Elna J. K., Tomas Hurtig, Andreas Ehn, and Christer Fureby. "Laminar Burning Velocity of Lean Methane/Air Flames under Pulsed Microwave Irradiation." Processes 9, no. 11 (November 19, 2021): 2076. http://dx.doi.org/10.3390/pr9112076.

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Laminar burning velocity of lean methane/air flames exposed to pulsed microwave irradiation is determined experimentally as part of an effort to accurately quantify the enhancement resulting from exposure of the flame to pulsed microwaves. The experimental setup consists of a heat flux burner mounted in a microwave cavity, where the microwave has an average power of up to 250 W at an E-field in the range of 350–380 kV/m. Laminar burning velocities for the investigated methane/air flames increase from 1.8 to 12.7% when exposed to microwaves. The magnitude of the enhancement is dependent on pulse sequence (duration and frequency) and the strength of the electric field. From the investigated pulse sequences, and at a constant E-field and average power, the largest effect on the flame is obtained for the longest pulse, namely 50 μs. The results presented in this work are, to the knowledge of the authors, the first direct determination of laminar burning velocity on a laminar stretch-free flame exposed to pulsed microwaves.

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Дисертації з теми "Microwave field"

Zimmer, Aline Katharina. "Investigation of the impact of turbine blade geometry on near-field microwave blade tip time of arrival measurements." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26558.

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Thesis (M. S.)--Aerospace Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Jagoda, Jechiel; Committee Co-Chair: Jacobs, Laurence; Committee Member: Seitzman, Jerry. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Folgar, Carlos Eduardo. "Structure Evolution of Silica Aerogel under a Microwave Field." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/27801.

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Structure evolution of silica aerogel was studied in microwave- and conventionally processed samples over the temperature range from 25 to 1200â °C. The samples were produced using sol-gel processing and dried under carbon dioxide supercritical conditions. After drying, the monolithic samples received a thermal treatment at different programmed temperatures in two different ovens, conventional and microwave. The microwave process was performed using a single mode microwave oven at 2.45GHz. Dielectric properties were measured using the cavity perturbation method, and structural characterization was carried out using a variety of techniques, including absorption surface analysis, Helium pycnometry, Archimedes principle, Fourier transform infrared spectroscopy, X-ray diffraction, and high resolution microscopy. The data obtained revealed that structural differences do exist between microwave- and conventionally processed samples. Three different regions were identified from the structural characterization of the samples. Regions I exhibited a structure densification at temperatures between 25 and 850â °C. Region II was characterized by a bulk densification in the temperature range from 850 to 1200â °C. Region III was represented by the onset of crystallization above 1200â °C. Explanation and possible causes behind the structural differences observed in each region are provided. In general, the structure evolution observed in microwave- and conventionally processed samples followed the same order, but occurred at lower temperature for the microwave process.
Ph. D.

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Narayana, Merugu Lakshmi. "Concurrent algorithms for microwave and millimetre wave field problems." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334591.

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Rossek, Sacha J. "Direct optical control of a microwave phase shifter using GaAs field-effect transistors." Thesis, Middlesex University, 1995. http://eprints.mdx.ac.uk/10682/.

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The design and analysis of a novel optical-to-microwave transducer based upon direct optical control of microwave gallium arsenide (GaAs) field-effect transistor (FET) switches is the subject of this thesis. The switch is activated by illuminating the gate depletion region of the FET device with laser light having a photon energy and wavelength appropriate to the generation of free carriers (electron-hole pairs) within GaAs. The effects of light on the DC and microwave properties of the GaAs FET are explored and analyzed to permit the characterization of the switching performance and transient response of a reflective microwave switch. The switch is novel in that it utilizes direct optical control, whereby the optically controlled GaAs FET is directly in the path of the microwave signal and therefore relies on optically-induced variations in the microwave characteristics of the switch. This contrasts with previous forms of optically controlled switches which rely on indirect methods with the optical stimulus inducing variations in the DC characteristics of the GaAs FET, such that there is no direct interaction between the optically illuminated GaAs FET and the microwave signal. Measured and simulated results relating to the switching performance and transient response of the direct optically controlled microwave switch have been obtained and published as a result of this work. For the first time, good agreement is achieved between the measured and simulated results for the rise and fall times associated with the transient response of the gate photovoltaic effect in optically controlled GaAs FET switches. This confirms that the GaAs FET, when used as an optically controlled microwave switch, has a transient response of the order of several micro-seconds. An enhanced model of the GaAs FET switch has been developed, which represents a more versatile approach and leads to improved accuracy in predicting switching performance. This approach has been shown to be valid for both optical and electrical control of the GaAs FET. This approach can be used to model GaAs FET switches in discrete or packaged forms and predicts accurately the occurrence of resonances which may degrade the switch performance in both switching states. A novel method for tuning these resonances out of the switch operating band has been developed and published. This allows the switch to be configured to operate over the frequency range 1 to 20 GRz. The agreement between the models and measured data has been shown to hold for two very different GaAs FET structures. The results of the direct optically controlled microwave GaAs FET switch have been used as the basis for the design of a novel direct optically controlled microwave phase shifter circuit; Measured and simulated results are in good agreement and verify that the performance of the optically controlled phase shifter is comparable with previously published results for electrically controlled versions of the phase shifter. The 10 GRz phase shifter was optically controlled over a 1 GRz frequency range and exhibited a mid-band insertion loss of 0.15 dB. The outcome of the work provides the basis for directly controlling the phase of a microwave signal using the output of an optical sensor, with the GaAs FET acting as an optical-to-microwave transducer through a monolithic interface.

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Barkhordarian, V. "The design and fabrication of Microwave Field-Effect Transistors." Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233220.

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Saleh, Wael Mouin. "Non-invasive near-field microwave detection of breast cancer." Thesis, University of Exeter, 2007. http://hdl.handle.net/10036/32212.

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The spread of breast cancer worldwide and the need for new technologies to improve breast cancer detection present a challenge to the standard medical screening methods. Tumour detection, in the early stages, is crucial if patients are to be treated effectively and with minimally invasive procedures. Thus, any technique that can improve on, or add to, existing breast tumour detection methods is welcome. In this thesis just such a technique based on near-field microwave imaging is investigated, both theoretically and experimentally. The electromagnetic waves interaction with dielectric structure is fundamental for any microwave application. Thus it is essential to understand the interaction of the microwaves radiated from the sensor (open-ended rectangular waveguide) with the breast structure under investigation. A detailed mathematical model describing the interaction of microwaves emitted from an open rectangular wave-guide with an N-layer dielectric structure is developed, using the Fourier Transform Matching method. The model is capable of calculating the electric field properties anywhere within the N-layer structure, as well as the complex reflection coefficient existing at the waveguide aperture. Computer simulations, based on the mathematical formulations derived using the Fourier Transform Matching method, of the near-field radiation patterns in a 3-layer approximation to the general N-layer model are presented. Such simulations are most useful in assessing the suitability of near-field microwave non-invasive testing and evaluation (NIT&E) technique for breast tumour detection. In addition, simulated 1-D and 2-D reflection phase and magnitude images are calculated and presented for the 3-layer structure with an inclusion to represent the presence of a tumour. Parameters controlling the detection sensitivity, specifically the frequency of operation, waveguide filling, and standoff distance dielectric filling, are investigated to obtain the optimal - 2 - parameters for the inspection system. The theoretical simulations show that a high sensitivity in both reflection coefficient magnitude and phase should be obtainable. Experimental measurements of the reflection coefficient magnitude and phase when imaging a breast phantom that imitates real breast dielectric properties contrast are also presented. The phantom comprises a plexiglass container filled with soybean oil to represent normal breast tissue, with a small balloon filled with diacetin solution to represent the tumour. Both uncalibrated and calibrated measurements of reflection coefficient magnitude and phase were performed. The microwave source comprised an open-ended rectangular waveguide operating in the frequency range of approximately 8.2 to 12.4 GHz. Calibrated measurements were performed using a slotted waveguide system. An in-depth analysis between calibrated measurements and simulation results for a simple dielectric structure is illustrated to verify the simulation results. Then, calibrated measurements for breast phantom are obtained. Finally, a theoretical-versus-experimental qualitative assessment for the breast phantom verifies the mathematical model developed in the thesis. Thus, a near-field microwave non-invasive detection prototype is designed to experimentally detect tumour presence via measuring the sensor’s aperture reflection coefficient.

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Mirkhaydarov, Bobur. "InAs nanowire field-effect transistors as RF/microwave switches." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/845099/.

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This project was dedicated to the development of solution-processed nanomaterials-based high-performance field-effect transistors (FETs) suitable for a new application area of printed reconfigurable antennas. The focus of research was on implementing solution processed high electron mobility InAs nanowires (NWs) as semiconducting channel in field effect transistors. The key direction of this work was the development of InAs NWs FETs with a designated high frequency waveguide geometry to enable they operation as microwave switch elements. Initially, InAs NW FETs were developed and tested in direct – current mode to allow evaluation and extraction of key transistor performance parameters such charge carrier mobility, threshold, on/off ratio, transconductance, subthreshold swing, and on-channel resistance. The InAs NW were assembled from nanowire ‘inks’ in the FETs channel via electric -field assisted assembly technique, dielectrophoresis. Nanowires were directly incorporated in FETs with bottom-gate architecture on Si/SiO2 substrates, and with top-gate architecture on quartz substrates with polymeric gate dielectrics. Current-voltage characteristics were measured both in controlled dry nitrogen atmosphere and ambient environment, and demonstrated an instability of unprotected InAs NW in ambient air. Protection of nanowire channel with Al2O3 layers has resulted in significant improvement of device stability. Optimised InAs NW FET devices demonstrated electron mobility over 1000 cm2/Vs and on-off current ratios up to 1000. Finally, a proof of principle for solution processed InAs NW field-effect transistors operating as microwave switches in 5-33GHz frequency range have been demonstrated. FET devices were implemented in co-planar waveguide (CPW) microwave transmission line geometry, providing efficient transmission or reflection of microwave signal. The FETs demonstrated high performance with transistor ON-state resistance as small as ≈50 Ω providing an excellent impedance match to that of microwave waveguide. Bringing FETs to the OFF state provided 1000 times resistance increase, resulting in FET microwave switch behaviour, characterised by ~10 dB change in scattering (S)-parameters, such as difference in transmission coefficient S21 between on/off switching states.

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Hamilton, Clive A. "Effects of magnetic and microwave fields on chemical reactions." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236269.

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Królak, Radoslaw [Verfasser]. "Investigation of field suitable microwave cavity measurement approaches / Radoslaw Królak." Aachen : Shaker, 2017. http://d-nb.info/1138177067/34.

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Zhou, Qiping. "Near-field microwave imaging with coherent and interferometric reconstruction methods." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1591903415194694.

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Книги з теми "Microwave field"

Slater, Dan. Near-field antenna measurements. Boston: Artech House, 1991.

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R, Hoefer Wolfgang J., ed. Microwave circuit modeling using electromagnetic field simulation. Boston, MA: Artech House, 2003.

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Perkin, R. M. Microwave oven studies: Development of a technique for mapping electric field distributions. London: Ministry of Agriculture, Fisheries and Food, 1993.

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Klystrons, traveling wave tubes, magnetrons, crossed-field amplifiers, and gyrotrons. Boston, MA: Artech House, 2011.

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Wittmann, Ronald C. Spherical near-field scanning: Experimental and theoretical studies. Boulder, Colo: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1990.

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Wittmann, Ronald C. Spherical near-field scanning: Experimental and theoretical studies. Boulder, Colo: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1990.

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Wittmann, Ronald C. Spherical near-field scanning: Experimental and theoretical studies. Boulder, Colo: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1990.

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Wittmann, Ronald C. Spherical near-field scanning: Experimental and theoretical studies. Boulder, Colo: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1990.

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Wittmann, Ronald C. Spherical near-field scanning: Experimental and theoretical studies. Boulder, Colo: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1990.

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Microwave field-effect transistors: Theory, design, and applications. 3rd ed. Atlanta: Noble, 1995.

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Частини книг з теми "Microwave field"

Olevsky, Eugene A., and Dina V. Dudina. "Microwave Sintering." In Field-Assisted Sintering, 237–74. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-76032-2_7.

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Legagneux, Pierre, Pierrick Guiset, Nicolas Le Sech, Jean-Philippe Schnell, Laurent Gangloff, William I. Milne, Costel S. Cojocaru, and Didier Pribat. "Microwave Amplifiers." In Carbon Nanotube and Related Field Emitters, 439–70. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527630615.ch27.

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Epsztein, B. "Cross-field tubes." In The Microwave Engineering Handbook, 65–79. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4899-4552-5_4.

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Anlage, Steven M., D. E. Steinhauer, B. J. Feenstra, C. P. Vlahacos, and F. C. Wellstood. "Near-Field Microwave Microscopy of Materials Properties." In Microwave Superconductivity, 239–69. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0450-3_10.

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Ida, N. "The Electromagnetic Field Equations and Theoretical Aspects." In Microwave NDT, 10–53. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2739-4_2.

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Bera, Subhash Chandra. "Microwave Field Effect Transistors." In Lecture Notes in Electrical Engineering, 79–110. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-3004-9_6.

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Yngvesson, Sigfrid. "HFETs — Heterojunction Field Effect Transistors." In Microwave Semiconductor Devices, 363–415. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3970-4_11.

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Grigoriev, Andrey D., Vyacheslav A. Ivanov, and Sergey I. Molokovsky. "Interaction of Charged Particles with an Alternating Electromagnetic Field." In Microwave Electronics, 11–42. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68891-6_2.

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Grigoriev, Andrey D., Vyacheslav A. Ivanov, and Sergey I. Molokovsky. "Interaction of Charged Particle Fluxes with a High-Frequency Electromagnetic Field." In Microwave Electronics, 53–71. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68891-6_4.

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Eaton, Gareth R., Sandra S. Eaton, David P. Barr, and Ralph T. Weber. "Magnetic Field and Microwave Frequency." In Quantitative EPR, 101–6. Vienna: Springer Vienna, 2010. http://dx.doi.org/10.1007/978-3-211-92948-3_10.

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Тези доповідей конференцій з теми "Microwave field"

Kamenetskii, E. O., M. Berezin, and R. Shavit. "Chiral-field microwave antennas Chiral microwave near fields for far-field radiation." In 2014 44th European Microwave Conference (EuMC). IEEE, 2014. http://dx.doi.org/10.1109/eumc.2014.6986572.

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Andres, Ana, Ruth De los Reyes, Mariola Sansano, D. Alcañiz, Ana Heredia, and Elias De los Reyes. "Innovative microwave technologies for food drying processes." In 21st International Drying Symposium. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/ids2018.2018.7725.

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It is well known that microwaves can assist most of food drying processes; but despite its benefits, microwave energy has not yet been exploited to its potential in the industrial applications. Some of the reasons are because available microwave technology (tubes and valves) cannot offer a homogeneous heating, causing hot/cold spots depending on product geometry and distribution in the chamber or tunnel. Particularly in drying processes, when available water decreases, the efficiency of the process will decrease. If the microwave power is not adjusted at this point of the drying process, the electromagnetic field strength increases and thermal runaway, arcing, or plasma formation can be created. Currently, the solid-state microwave heating (S2MH) technology is considered one of the most promising options to avoid the ancient problems preserving the known advantages. The new S2MH features include frequency and phase variability and control, low input-voltage requirements, compactness and rigidity, reliability, and better compatibility with other electronic possibilities (Internet-of-Things). The first notable advantaged is the S2MH system ability to assess feedback from forward and reflected signal. This allows the application to easily measure and track the energy levels being put into the load, which can avoid the mentioned final drying problem, together with many others related to monitoring needs. On the other hand, almost all energy consumption and CO2 generation in drying processes correspond to air heating stage. To tackle this problem, Advanced Materials for Microwaves based Heating (AM2H) have been developed for transducing electromagnetic energy into heat, which is transferred to air by using high contact surface ceramic structures. The aim of this work is to review Microwaves Assisted Drying Processes and to present the advantages offered by two innovative microwave technologies: Solid-State Microwave Heating (S2MH) technology and Advanced Materials for Microwaves based Heating (AM2H).

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Horikoshi, Satoshi. "ELUCIDATION OF ELECTROMAGNETIC WAVE EFFECT AND OUTGOING OF FUTURE TREND IN MICROWAVE CHEMISTRY AND BIOLOGY." In Ampere 2019. Valencia: Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/ampere2019.2019.9783.

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The German chemist Theodor Grotthuss was the first to formulate the first law of photochemistry in 1817; he postulated that a reaction could be driven by light when the energy of light is absorbed by molecules [1]. After that, photochemistry has greatly contributed to the development of photography. In addition, second laws of photochemistry (Stark-Einstein law) was enacted, and these two laws have elevated photochemistry as an academic (science) discipline over the last one hundred years. In addition, because of advances in light sources and various devices (engineering), such materials and processes as photocatalysts, organic solar cells, photopolymerization, quantum dots, and photochromism (among others) are currently being applied in various other fields. The next significant surge in chemistry is microwave chemistry wherein microwaves, which represent electromagnetic waves other than light, were introduced as a driving force in the chemical reaction domain in the late 1980s. There are three characteristics in this chemistry when using microwaves. The first is the high heating efficiency caused by the energy of the microwaves that directly reach and are absorbed by the substance. The second is the selectivity with which a specific substrate is heated, while the third characteristic is the enhancement of chemical syntheses by the microwaves’ electromagnetic wave energy, often referred to as the microwave effect (or non-thermal effect). The phenomenon of the microwave effect (third characteristic) impacting chemical reactions has been summarized in much of the relevant literature, however, the reason why the microwave effect has not been clarified to anyone’s satisfaction is that the term microwave effect in microwave chemistry includes numerous factors. In order to fix microwaves in the chemical field, it is urgent to develop laws of “microwavechemistry”, and to do it is necessary to systematization against the phenomenas of electromagnetic waves for materials and reactions. One of the reasons for the dramatic growth in photochemistry is the development of high power laser technology. In recent years, coherent semiconductor generator with the generating high power microwaves have become easy to get, so “microwavechemistry” can proceed to the next stage. We examined that the phenomena as microwave electromagnetic waves in chemical reactions by using a semiconductor generator and a power sensor. And, it clarified that the reaction rate and yield of a very small part of the chemical reaction change with the unique phenomenon to electromagnetic waves [2]. On the other hand, generally, as plants, enzymes, biological substances temperature rises, it inhibits growth and reaction. This phenomenon was used to overcome the electromagnetic wave effect. We have succeeded in improving these activities by irradiating weak microwaves which do not increase these temperatures [3]. If microwave heating is given to them, it will work negatively. In this invited presentation, it introduces the possibility of electromagnetic wave effect(s) in these and explain its industrial application.

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Gaikovich, K. P. "Near-field microwave tomography." In 2005 15th International Crimean Conference Microwave and Telecommunication Technology. IEEE, 2005. http://dx.doi.org/10.1109/crmico.2005.1565175.

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Haider, Michael, Andrey Baev, Yury Kuznetsov, and Johannes A. Russer. "Near-Field to Far-Field Propagation of Correlation Information for Noisy Electromagnetic Fields." In 2018 48th European Microwave Conference (EuMC). IEEE, 2018. http://dx.doi.org/10.23919/eumc.2018.8541636.

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Zhang, Qiong, Tom H. Jackson, and Aydin Ungan. "Numerical Simulation of Continuous Microwave Hybrid Heating Process." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0829.

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Abstract This study developed a numerical model to simulate a continuous hybrid microwave heating process using a single-mode microwave resonant cavity. A hybrid heating process combines the volumetric energy deposition from microwaves with a convective heat flux at the surface. This combination of heating mechanisms may be used to produce more uniform temperature distributions than either method alone. A Finite Difference Time Domain (FDTD) technique was used to model the electric field distribution. The field strength data allowed power deposition to be approximated and the control volume method was used to solve the energy equation. Temperature dependence of dielectric properties was simulated through an iterative process. This simulation showed that hybrid heating schemes can be used to increase uniformity of the temperature distribution and reduce incidences of thermal runaway.

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Giunta, M., W. Hansel, M. Lessing, M. Lezius, M. Fischer, Ronald Holzwarth, X. Xie, et al. "Field-deployable Photonic Microwave Synthesizer." In 2018 IEEE International Frequency Control Symposium (IFCS). IEEE, 2018. http://dx.doi.org/10.1109/fcs.2018.8597461.

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Rosa, Goncalo D., and Nuno B. Carvalho. "Microwave Oven Field Detector Probe." In 2018 IEEE Wireless Power Transfer Conference (WPTC). IEEE, 2018. http://dx.doi.org/10.1109/wpt.2018.8639494.

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Anthony Opoku, Lope G Tabil, Venkatesh Meda, and Satya Panigrahi. "Microwave and microwave-vacuum drying kinetics of field peas." In 2007 Minneapolis, Minnesota, June 17-20, 2007. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2007. http://dx.doi.org/10.13031/2013.23293.

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Lewandowski, Leon, and Keith Struckman. "Microwave vision for robots." In Conference on Intelligent Robots in Factory, Field, Space, and Service. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1994. http://dx.doi.org/10.2514/6.1994-887.

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Звіти організацій з теми "Microwave field"

Marchand, Roger. Dual Microwave Radiometer Experiment Field Campaign Report. Office of Scientific and Technical Information (OSTI), September 2017. http://dx.doi.org/10.2172/1378333.

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Gilgenbach, Ronald M. Crossed-Field, High Energy Microwave Source Experiments and Theory. Fort Belvoir, VA: Defense Technical Information Center, July 2002. http://dx.doi.org/10.21236/ada408034.

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Ohlinger, Wayne L., and D. N. Hill. Field Emission Cathode and Vacuum Microelectronic Microwave Amplifier Development. Fort Belvoir, VA: Defense Technical Information Center, March 1992. http://dx.doi.org/10.21236/ada253846.

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Srinivasan, Gopalan. Electric Field Tunable Microwave and MM-wave Ferrite Devices. Fort Belvoir, VA: Defense Technical Information Center, April 2010. http://dx.doi.org/10.21236/ada523303.

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Browning, Jim, Sin M. Loo, and John Chiasson. A Smart Microwave Vacuum Electron Device (MVED) Using Field Emitters. Fort Belvoir, VA: Defense Technical Information Center, January 2012. http://dx.doi.org/10.21236/ada561944.

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Hirshfield, Jay l. SURFACE FILMS TO SUPPRESS FIELD EMISSION IN HIGH-POWER MICROWAVE COMPONENTS. Office of Scientific and Technical Information (OSTI), February 2014. http://dx.doi.org/10.2172/1118602.

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Asher, William E. Field Measurement of the Effects of Foam and Roughness on Microwave Emissivity. Fort Belvoir, VA: Defense Technical Information Center, September 2001. http://dx.doi.org/10.21236/ada623705.

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Ali, A. W. Intense and Short Pulse Electric Field (DC and Microwave) Air Breakdown Parameters. Fort Belvoir, VA: Defense Technical Information Center, August 1986. http://dx.doi.org/10.21236/ada172227.

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Itoh, T. New Trends and Ideas in the Fields of Microwave Technology,. Fort Belvoir, VA: Defense Technical Information Center, September 1994. http://dx.doi.org/10.21236/ada291663.

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