Journal of Microwave Power and Electromagnetic Energy最新文献

{"title":"Editor’s message: valorising the experimental material presented in the data notes","authors":"Juan Antonio Aguilar Garib","doi":"10.1080/08327823.2023.2238574","DOIUrl":"https://doi.org/10.1080/08327823.2023.2238574","url":null,"abstract":"Published in Journal of Microwave Power and Electromagnetic Energy (Vol. 57, No. 3, 2023)","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"2 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138518657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electromagnetic interference shielding effectiveness and microwave absorption performance of plaster mortars containing metal waste chips in X-band frequency range","authors":"K. Ateş, Tolga Ziya Kocaer, S. Ozen, N. Kockal","doi":"10.1080/08327823.2023.2235553","DOIUrl":"https://doi.org/10.1080/08327823.2023.2235553","url":null,"abstract":"Abstract Exposure to electromagnetic radiation from digital devices, especially in the radio frequency range, affects human health in buildings. Furthermore, various electronic devices might be vulnerable to electromagnetic pollution in the same manner. Therefore, the electromagnetic interference (EMI) shielding technique is one of the electromagnetic compatibility (EMC) engineering phenomena that prevents the detrimental effects by means of electromagnetic pollution, especially in building areas. This work investigates the EMI shielding effectiveness and electromagnetic absorbing activities of plaster mortars containing various waste metals with different ratios. Measurements have been carried out in the frequency range of 8.2–12 GHz. Results concluded that the reference material shows the lowest total shielding effectiveness. The plaster mortar sample containing 20% iron, 3% steel, and 3% chromium showed the maximum EMI shielding effectiveness with a range of 20–24 dB. Measurement results indicated that the absorption capability is the dominant component of the total shielding effectiveness, except for the reference sample. Furthermore, the apparent porosity of each sample was analyzed. The maximum apparent porosity was obtained by chromium chips waste added sample. It was obtained that the iron waste chips increased the apparent porosity of samples.","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"201202 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77696383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of the microwave and thermosonic vacuum concentration methods on quality parameters of hibiscus (hibiscus sabdariffa L.) extract and mathematical modeling of concentration","authors":"Cuneyt Dincer, Timur Tongur, T. Erkaymaz","doi":"10.1080/08327823.2023.2235549","DOIUrl":"https://doi.org/10.1080/08327823.2023.2235549","url":null,"abstract":"Abstract This study investigates the modeling of the concentration of hibiscus extracts and the effect of the concentration process on some quality properties of hibiscus extracts. Absolute pressure was applied as 250 mbar in all concentration processes. Thermal vacuum concentration process was applied at 75 °C and 80 °C, thermosonic vacuum concentration process was applied at 75 °C and 0.02 W/mL AED, and microwave vacuum concentration treatment was applied at 180 and 300 W. The shortest processing time was achieved with the microwave vacuum concentration process at 300 W. Among the 13 models used, Midilli was the most successful model (R 2 ≥ 0.9951, χ2 ≤ 1.0185 and RMSE ≤ 1.0092)) in describing the concentration data. No significant change was determined in the physicochemical properties of the concentrated samples. However, a significant increase was determined in the turbidity values of the concentrated hibiscus samples, while a significant decrease was noted in the anthocyanin content and composition and antioxidant activity values of the concentrated samples compared to the initial sample.","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"82 1","pages":"163 - 177"},"PeriodicalIF":1.5,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91139603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Process parameters of microwave heating-assisted vacuum evaporation of tomato juice: quality, energy consumption, exergy performance, and kinetic processing","authors":"Taher Sofizadeh, J. Khodaei, H. Darvishi, N. Behroozi-Khazaei, M. Koushesh Saba","doi":"10.1080/08327823.2023.2235551","DOIUrl":"https://doi.org/10.1080/08327823.2023.2235551","url":null,"abstract":"Abstract Increasing heating performance and preservation of product quality are critical factors in the food industry. Although microwave-vacuum heating is applied in many food processes, there are many unanswered questions about its effects on sensitive foods. In this study, the tomato juice was concentrated in microwave-vacuum heating system and results compared with conventional and conventional-vacuum heating methods. The effect of pressure and microwave power was investigated on quality parameters, energy consumption, exergy performance, and processing kinetics of tomato juice concentration. The processing time in the microwave-vacuum method was 2.3 to 6.3-fold lower than conventional and conventional-vacuum methods. The exergy performance was obtained in the range of 7.16–13.29% for microwave-vacuum heating and 2.04–2.99% for conventional methods. Microwave vacuum heating could reduce energy consumption by 30–71%, compared with conventional-vacuum methods. The minimum decline in ascorbic acid and total phenol content of tomato juice concentrate was observed for microwave-vacuum evaporation. Microwave-vacuum heating was an excellent concentration technique that provided tomato paste with improved nutritional quality, increasing exergy efficiency, reducing processing time and energy consumption compared to conventional and conventional vacuum processes.","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"7 1","pages":"203 - 218"},"PeriodicalIF":1.5,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90918485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the microwave heating temperature uniformity of an intelligent synergistic mode stirrer","authors":"Biao Yang, Feiyun Peng, Cheng Cheng, Zhaogang Wu, Hongbin Huang","doi":"10.1080/08327823.2023.2235550","DOIUrl":"https://doi.org/10.1080/08327823.2023.2235550","url":null,"abstract":"Abstract Aiming at the intercoupling of multiple physics and the time-varying characteristics of boundary conditions in the microwave heating process, how to optimize the temperature uniformity of materials with a cooperative-mode stirrer is focused in this paper. First, the formation of standing waves can be effectively avoided by introducing the mode stirrer, thereby improving the heating efficiency of the material. Description of pattern stirrer motion processes using implicit functions and level set methods. Second, in order to optimize the temperature uniformity of the material, the stirrer is made intelligent, and the electromagnetic field distribution can be optimized by using different stirrer positions and directions, and the temperature uniformity is improved through intelligent coordination of stirrers in different positions. Finally, the finite element method is used to perform numerical simulation calculations on integer and continuous variables. The results show that the proposed method can improve the temperature uniformity of the conventional microwave heating model by 28.2%–81.44% and 23.2%∼63.91% at each level and lead hammer section respectively, and can improve the heating efficiency by 14.8%∼36.4%. According to its performance when heating different shapes and different materials, the proposed method is efficient and feasible.","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"23 1","pages":"178 - 202"},"PeriodicalIF":1.5,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77015725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of seasonal variation in dielectric properties of groundwater from Vadodara region","authors":"F. M. Modi, D. H. Gadani, V. A. Rana","doi":"10.1080/08327823.2023.2235552","DOIUrl":"https://doi.org/10.1080/08327823.2023.2235552","url":null,"abstract":"Abstract Groundwater samples were collected during different months from the same site from Vadodara district of Gujarat state. The complex permittivity of the water samples were precisely determined over the frequency span 20 Hz to 2 MHz. Complex permittivity spectral data were converted into complex impedance formalism. Obtained results were analysed to get information of seasonal variation in groundwater quality. Dielectric constant for all samples is found to decrease linearly and rapidly with increase in frequency up to about 4 kHz, after which it decreases slowly and achieves static value approximately 78, near 2 MHz for all water samples. Dielectric loss for the water sample collected in monsoon season (August) is the highest, which shows the presence of ions dissolved from the soil in rain water. DC resistance values, determined from the complex impedance plane plot (Z′’ vs. Z″), suggested an increase in the conductivity of the water samples collected near the end of monsoon season, due to the dissolved minerals and salts from soil. The calculated values of ε′’/ε′’ DW and ε″/ε″DW ratio for the water sample of August’18 show a relatively large increase during the post-monsoon month of August’18, above 2 kHz, as compared to other months.","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"109 1","pages":"219 - 229"},"PeriodicalIF":1.5,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83085717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An investigation on electromagnetic shielding effectiveness of metallic enclosure depending on aperture position","authors":"Sunay Güler","doi":"10.1080/08327823.2023.2209477","DOIUrl":"https://doi.org/10.1080/08327823.2023.2209477","url":null,"abstract":"Abstract Electromagnetic compatibility (EMC) become one of the most important topics during electric vehicle design due to incorporating high voltage systems into conventional vehicle electronic architecture. Electromagnetic shielding enclosure is a conductive barrier utilized for protecting electronic circuits against external electromagnetic interference (EMI). Shielding effectiveness (SE) is a measure of shielding performance for the enclosures. Aperture of the enclosures attenuate SE by permitting EMI leakage to affect the electronic circuits. In this study, the effect of aperture position on SE is investigated while the dimensions of the enclosure remain fixed. It is obtained that SE varies depending on the aperture positions and it gets better while aperture is closer to the corners of the front panel. Then, the effects of different observation points, the dimensions of enclosure and aperture on SE are analysed while keeping the aperture position at the corner. It is obtained that SE gets better when the observation point is located far away from the aperture. Enlarging the enclosure dimensions makes SE better while increasing aperture dimensions attenuates SE. Finally, it is concluded that it is crucial to consider aperture position, observation point, the dimensions of enclosure and aperture to obtain better SE.","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"16 1","pages":"129 - 145"},"PeriodicalIF":1.5,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91139423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Editor’s message: about Artificial Intelligence as a tool for writing papers","authors":"J. Aguilar-Garib","doi":"10.1080/08327823.2023.2204648","DOIUrl":"https://doi.org/10.1080/08327823.2023.2204648","url":null,"abstract":"Artificial Intelligence (AI) has become a trendy topic through advertisements, notes and even warnings about it, claiming that it can be used to answer almost any kind of question. Although we did not use to call it AI, we are somehow familiar with the concept of having computers answering tough inquiries as it can be seen in several science fiction stories, where they predict scenarios and help people to make decisions. In some cases, computers portraying certain personality were shown, but most of them did not imitate human intelligent behavior. Probably robots built with positronic brains were the only ones exhibiting such actions, but they still belong to the science fiction universe, hence there are no details on how they work to mimic human like thought. Modern AI consists in algorithms running by computers to simulate human capacity for learning, understanding, reasoning, and deducting. These are not isolated abilities since they conform a system which includes gathering data, analyzing, and reaching to conclusions. In many cases, worthiness perception of this intelligence depends on its applicability. The IA features have been described by many reporters and social media, claiming its great feats in forecasting scenarios, answering questions, and performing some tasks, as they were carried out by intelligent flowless humans. Therefore, as soon as IA applications (software) became readily available, a lot of tests follow up. Some are pursuing a quite serious interest in learning more about this technology and its capacities, while others are just driven by curiosity. Several opinions have emerged from the news and reports of the users, so that there are enthusiastic people who see a powerful tool that might help professionals to perform their tasks, better or faster, in opposition to others who are afraid of its probable misuse, proposing that it should be banned. This response could be compared to the automation technology, that nowadays uses AI for controlling machines while performing programmed instructions. The automatic devices include, but are not limited to, house appliances, manufacturing machines, service machines, and vehicles. This technology that might be controversial has matured so that it is not questioned and seems naturally employed. Perhaps a point of concern with AI is that it is supposed to perform intellectual rather than hard work, although AI exists in all kinds of apparatus and gadgets with the smart adjective. Among the intellectual applications of AI that are becoming an attractive interest is writing. We are wondering if AI can really produce new documents, write essays, and do the homework of the students or anyone who wants to produce written material. The articles attributed to AI, demonstrating congruence resembling human work, are aimed to general topics and comments about markets, sports, and other events, where their originality is based on the quality of the compilation presented as a single easy to read","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"119 1","pages":"89 - 90"},"PeriodicalIF":1.5,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86831523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microwave-assisted hot air drying of bone broth-based sauce","authors":"Cuneyt Dincer, E. Aykın‐Dinçer, Özer Kütükçü","doi":"10.1080/08327823.2023.2209771","DOIUrl":"https://doi.org/10.1080/08327823.2023.2209771","url":null,"abstract":"Abstract In this study, it was aimed to bring the bone broth-based sauce into powder form by microwave assisted hot air drying method and to determine the drying characteristics of this product. Bone broth-based sauces were dried at the drying temperatures of 60, 70 and 80 °C, and at the microwave powers of 90, 180 and 360 W, until a moisture content of 10% (dry basis). The moisture ratio (MR) was significantly influenced by the drying temperature and microwave power. Ten kinetic models were selected to evaluate MR data, with regard to adjusted regression coefficient (R2 ), the reduced chi-square (χ2 ) and root mean square error (RMSE). Midilli and Page models exhibited a better fit for the drying kinetics of bone broth-based sauce than the other drying models tested. In addition, the effective moisture diffusivity (Deff ) and activation energy (Ea ) values were 1.27 × 10−7 m2/s and 27 kJ/mol, respectively. Consequently, these results can be used to simulate the microwave assisted hot air drying of bone broth-based sauce and improve the efficiency of the drying process.","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"5 1","pages":"146 - 160"},"PeriodicalIF":1.5,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84265184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dielectric properties of Sphenarium purpurascens at 2.4 GHz","authors":"Tejinder Kaur, J. Olvera-Cervantes, R. Rojas‐Laguna, María Elena Sosa-Morales, A. Corona‐Chavez","doi":"10.1080/08327823.2023.2203633","DOIUrl":"https://doi.org/10.1080/08327823.2023.2203633","url":null,"abstract":"Abstract The dielectric properties of edible grasshoppers (Sphenarium purpurascens) are presented at 2.4 GHz using the cavity perturbation technique. The samples are subjected to increasing temperatures (from 25 to 80 °C). It will be shown that the real part of the permittivity has a decreasing trend to rising temperature. As temperature increases, water evaporates; therefore the value of permittivity decreases. Moreover, dielectric losses increase with increasing temperature from 16 at 25 °C to 32 at 80 °C. This is caused by a predominant ionic conduction at lower frequencies, where ionic mobility increases at higher temperatures. In addition, the penetration depth decreases from 10.8 mm at 25 °C to 3.5 mm at 80 °C.","PeriodicalId":16556,"journal":{"name":"Journal of Microwave Power and Electromagnetic Energy","volume":"38 1","pages":"91 - 101"},"PeriodicalIF":1.5,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77533725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}