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Journal of Microwave Power and Electromagnetic Energy

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https://www.readbyqxmd.com/read/24779230/influence-of-low-and-high-frequency-heating-on-biodegrading-microorganisms-in-soil-microbial-degradation
#1
Ulf Roland, Frank Holzer, Frank-Dieter Kopinke
The influence of low-frequency (50 Hz) resistive and high-frequency (13.56 MHz, radio-frequency) dielectric heating in comparison to conventional heating on the microbial degradation of pollutants in soil was studied. The investigation of the biodegradation of model substances (benzoic acid, acetic acid, glucose, sodium acetate) added to a standard soil showed no significant influence of the electrical heating methods when compared with samples heated to the same temperature in a water bath. Therefore, a hindrance of the microbial degradation could be excluded as it was done for soil respiration in a previous study...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779229/measurement-of-output-power-density-from-mobile-phone-as-a-function-of-input-sound-frequency
#2
Emanuele Calabrò, Salvatore Magazù
Measurements of power density emitted by a mobile phone were carried out as a function of the sound frequency transmitted by a sound generator, ranging from 250 to 14000 Hz. Output power density was monitored by means of the selective radiation meter Narda SRM 3000 in spectrum analysis mode, and the octave frequency analysis of each tone used for the experimental design was acquired by the sound level meter Larson Davis LxT Wind. Vodafone providers were used for mobile phone calls with respect to various local base station in Southern-Italy...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779228/microwave-sintering-studies-on-low-loss-zn-mg-tio3-dielectric-resonator-materials
#3
Roopas Kiran Sirugudu, Rama Krishna Murthy Vemuri, B S Murty
Low dielectric loss Zn07Mg0.3TiO3 and MgTiO3 microwave dielectric resonators were prepared by the conventional solid state reaction method. The microwave interaction with these materials has been studied using both single-mode and multimode microwave furnaces operating at a frequency of 2.45 GHz. Microwave sintering could be achieved using a multimode microwave furnace only, whereas, interaction with a single-mode furnace showed plasma generation. Phase formation was observed by X-ray diffraction. Microwave dielectric characteristics such as dielectric constant (epsilon'), quality factor (Q x f) and temperature coefficient of resonant frequency (tauf) of microwave sintered samples were measured using a vector network analyzer and compared with conventional sintered ones...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779227/calorimetry-study-of-microwave-absorption-of-some-solid-materials
#4
Chun Lin He, Shao Jian Ma, Xiu Juan Su, Yan Qing Chen, Yu Shi Liang
In practice, the dielectric constant of a material varies the applied frequency the material composition, particle size, purity, temperature, physical state (solid or liquid), and moisture content. All of these parameters might change during processing, therefore, it is difficult to predict how well a material will absorb microwave energy in a given process. When the temperature is measured by a digital thermometer, it could not accurately reflect the true temperature of the bulk materials, especially for mixed materials...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779226/dielectric-characterization-of-the-seeds-of-invasive-chinese-tallow-tree
#5
Laura Picou Fennell, Dorin Boldor
Biofuels have the potential to replace a significant portion of the transportation needs of the USA and the world. Low-cost lipid feedstock (i.e. tallow tree seeds) can be used for production of biodiesel, but these seeds need to be dried. Microwave drying is utilized to dry various seeds and grain, but for this process to be most efficient the dielectric properties of the materials need to be known. This study presents, for the first time, the dielectric properties of the seeds of the Chinese tallow tree. The dielectric constant and dielectric loss factor were determined using a modified free-space method for different moisture contents at frequency ranges centered around 915 and 2450 MHz respectively...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779225/international-year-of-crystallography
#6
EDITORIAL
Juan Antonio Aguilar-Garib
No abstract text is available yet for this article.
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779147/a-new-design-of-an-s-x-dual-band-circular-slot-antenna-for-radar-applications
#7
Said Ghnimi, Rawia Wali, Ali Gharsallh, Tchanguiz Razban
A novel design of dual-band slot antenna with a circular patch for radar applications is presented and studied. It is fed by a micro-strip line and built on a FR-4 substrate with a whole size of 18 x 30 mm2. A dual band printed antenna is created by introducing slots on the radiating element. By this, two bandwidth, covering C and X band, are achieved. In order to obtain a good fundamental antenna design, the initial studies were carried out theoretically, using CST Microwave Studio simulation software. In this case, the frequency range at return loss < 10 dB is 5...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779146/design-of-dual-band-wearable-antenna-using-metamaterials
#8
Adeel Afridi, Sadiq Ullah, Shahbaz Khan, Aziz Ahmed, Akhtar Hussain Khalil, Munir Ahmad Tarar
This paper presents two types of dual band (2.4 and 5.8 GHz) wearable planar dipole antennas, one printed on a conventional substrate and the other on a two-dimensional metamaterial surface (Electromagnetic Bandgap (EBG) structure). The operation of both antennas is investigated and compared under different bending conditions (in E and H-planes) around human arm and leg of different radii. A dual band, Electromagnetic Band Gap (EBG) structure on a wearable substrate is used as a high impedance surface to control the Specific Absorption Rate (SAR) as well as to improve the antenna gain up to 4...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779145/preparation-of-modified-semi-coke-by-microwave-heating-and-adsorption-kinetics-of-methylene-blue
#9
Xin Wang, Jin-Hui Peng, Xin-Hui Duan, Chandrasekar Srinivasakannan
Preparation of modified semi-coke has been achieved, using phosphoric acid as the modifying agent, by microwave heating from virgin semi-coke. Process optimization using a Central Composite Design (CCD) design of Response Surface Methodology (RSM) technique for the preparation of modifies semi-coke is presented in this paper. The optimum conditions for producing modified semi-coke were: concentration of phosphoric acid 2.04, heating time 20 minutes and temperature 587 degrees C, with the optimum iodine of 862 mg/g and yield of 47...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779144/highly-luminescent-pbs-zns-nanoparticles-synthesized-by-a-microwave-method
#10
Thelma Serrano, Alejandro Vazquez, Idalia Gómez
Nanoparticles with PbS core of 12 nm and shell of approximately 3 nm were synthesized at PbS:ZnS ratios of 1.01:0.1 using Merca Ptopropionic Acid as stabilizing agent. PbS/ZnS nanoparticles present a dramatically increase of Photoluminescence intensity, confirming the confinement of the PbS core by increasing the Quantum Yield from 0.63 to 0.92 by the addition of the ZnS shell. In this case, the synthesis by microwave method allows obtaining nanoparticles with enhanced optical characteristics in shorter reaction time than those of nanoparticles synthesized by colloidal method...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779143/improving-heating-uniformity-of-pathological-tissue-specimens-inside-a-domestic-microwave-oven
#11
Osama A Hassan, Ahmed H Kandil, Ahmed M El Bialy, Iman A Hassaballa
A 3D coupled electromagnetic thermal model was developed using COMSOL 4.0 to predict the electromagnetic field distribution and temperature profile in pathological tissue samples immersed in a reagent inside the oven cavity. The effect of the volume of reagent on the mean heating rate and heating uniformity within the tissue sample was investigated. Also, the effect of using a water load, as a method of temperature control, is emphasized. A well insulated K type thermocouple connected to a PC is used for model validation...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779142/publications-about-microwaves
#12
EDITORIAL
Juan Antonio Aguilar-Garib
No abstract text is available yet for this article.
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779141/buoyancy-driven-mixing-of-miscible-fluids-by-volumetric-energy-deposition-of-microwaves
#13
Adam J Wachtor, Veronika Mocko, Darrick J Williams, Matthew P Goertz, Farzaneh F Jebrail
An experiment that seeks to investigate buoyancy driven mixing of miscible fluids by microwave volumetric energy deposition is presented. The experiment involves the use of a light, non-polar fluid that initially rests on top of a heavier fluid which is more polar. Microwaves preferentially heat the polar fluid, and its density decreases due to thermal expansion. As the microwave heating continues, the density of the lower fluid eventually becomes less than that of the upper, and buoyancy driven Rayleigh-Taylor mixing ensues...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779140/temperature-and-moisture-dependence-of-the-dielectric-properties-of-silica-sand
#14
Chenhui Liu, Libo Zhang, Jinhui Peng, Chandrasekar Srinivasakannan, Bingguo Liu, Hongying Xia, Junwen Zhou, Lei Xu
The major objective of this work was to investigate the effects of temperature and moisture content on the dielectric properties of silica sand. The dielectric properties of moist silica sand at five temperatures between 20 to 100 degrees C, covering different moisture content levels at a frequency of 2.45 GHz, were measured with an open-ended coaxial probe dielectric measurement system. The wave penetration depth was calculated based on the measured dielectric data. The results show moisture content to be the major influencing factor for the variation of dielectric properties...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779139/influence-of-low-and-high-frequency-electrical-heating-on-biodegrading-microorganisms-in-soil-soil-respiration
#15
Ulf Roland, Frank Holzer, Frank-Dieter Kopinke
The influence of electrical heating on microbiological processes in soil has been studied to evaluate the potential for enhancing biodegradation of pollutants by controlling the temperature. A frequency of 50 Hz (power line frequency) was applied for resistive heating. Dielectric heating was realized using a frequency of 13.56 MHz (radio frequency). Both techniques were compared with conventional heating in a water bath. For experiments in laboratory and full scale, a model soil and a contaminated original soil were used...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779138/an-efficient-empirical-model-for-microwave-induced-average-temperature-of-liquid-cylindrical-reactants
#16
Chuqiao Yang, Vadim V Yakovlev
Microwave-assisted chemical reactions have become very popular in preparative chemistry due to many advantages such as accelerated reaction rate, higher chemical yield and lower energy use. In dedicated equipment, however, the microwave units operate as "black boxes" keeping the role of the thermal effects in microwave-assisted chemical processes somewhat obscure. To address this issue, in this paper, we propose a simple mathematical model for computing microwave-induced temperature in a three-media cylindrical structure representing a core element of a typical microwave reactor with the reactant assumed to be stirred by convection flows...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779137/physico-chemical-characteristics-of-microwave-dried-wheat-distillers-grain-with-solubles
#17
Maria Rosario P Mosqueda, Lope G Tabil, Venkatesh Meda
Laboratory-prepared samples of wheat distillers grain with solubles with varying condensed distillers solubles (CDS) content were dried under varying microwave power, and microwave convection settings using a domestic microwave oven to examine their effect on the chemical, structural, color, flow, compression, thermal, and frictional properties of the product, which is dried distillers grain with solubles (DDGS). As CDS level increased, protein and ash content increased, while fat and fiber content decreased in wheat-based DDGS...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779136/mw-domestic-ovens-out-of-the-kitchen
#18
EDITORIAL
Juan Antonio Aguilar-Garib
No abstract text is available yet for this article.
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779135/microwave-assisted-extraction-of-essential-oils-from-herbs
#19
Gabriel Abraham Cardoso-Ugarte, Gladys Paola Juárez-Becerra, María Elena Sosa-Morales, Aurelio López-Malo
Microwave-assisted extraction (MAE) has been recognized as a technique with several advantages over other extraction methods, such as reduction of costs, extraction time, energy consumption, and CO2 emissions. In this study, MAE was performed to obtain essential oils from two different herbs (basil and epazote). A factorial design was conducted in order to determine the effect of solvent quantity, power, and heating time on essential oil yields. Chemical composition, physical properties and yield percentage of essential oils from MAE were compared with essential oils obtained by steam distillation (SD)...
2013: Journal of Microwave Power and Electromagnetic Energy
https://www.readbyqxmd.com/read/24779134/microwave-ovens-and-food-safety-preparation-of-not-ready-to-eat-products-in-standard-and-smart-ovens
#20
Robert F Schiffmann
The introduction of several Not-Ready-to-Eat (NRTE) products, beginning in 2007, has resulted in several recalls and has caused serious concerns about their safe-cooking in microwave ovens. These products are not fully-thermally processed prior to sale but depend upon the consumer to finish cooking them to the safe minimum temperatures, defined by the USDA, in order to destroy any sources of foodborne illnesses. While microwave ovens are a primary means of this finish-cooking step, they are known to cook foods unevenly in terms of temperature distribution, especially from a frozen state, and this may cause parts of the food to be below the required safe-temperature...
2013: Journal of Microwave Power and Electromagnetic Energy
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