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The Journal of microwave power最新文献

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Wave Propagation in Rectangular Waveguides with Symmetrically Placed Tapered Ridges 对称放置锥形脊的矩形波导中的波传播
The Journal of microwave power Pub Date : 1984-01-01 DOI: 10.1080/16070658.1984.11689348
El-Deek M. El-Sayed, A. M. Hashem
{"title":"Wave Propagation in Rectangular Waveguides with Symmetrically Placed Tapered Ridges","authors":"El-Deek M. El-Sayed, A. M. Hashem","doi":"10.1080/16070658.1984.11689348","DOIUrl":"https://doi.org/10.1080/16070658.1984.11689348","url":null,"abstract":"AbstractThis paper is concerned with the determination of the cutoff wavelength and field components of the dominant TE mode propagating in rectangular waveguides with single- and double-tapered ridges placed symmetrically about the guide axis. The tapering is in the direction of wave propagation. Evaluations of cutoff wavelength and of values of field components along the central axis are carried out. Different configurations of tapered-ridges are investigated. Curves of cutoff wavelength and field components of the dominant TE mode are plotted as a function of position along the axis, with the tapering angle as a variable parameter. The field components are determined for a generated frequency of 2.45 GHz. The illustrated data are quite useful in designing ridge waveguide applicators of microwave heating and drying systems.","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"C-25 1","pages":"35-46"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84427678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Microwave Treatment of Pasteurized Milk 巴氏奶的微波处理
The Journal of microwave power Pub Date : 1984-01-01 DOI: 10.1080/16070658.1984.11689374
C. Chiu, K. Tateishi, F. Kosikowski, G. Armbruster
{"title":"Microwave Treatment of Pasteurized Milk","authors":"C. Chiu, K. Tateishi, F. Kosikowski, G. Armbruster","doi":"10.1080/16070658.1984.11689374","DOIUrl":"https://doi.org/10.1080/16070658.1984.11689374","url":null,"abstract":"AbstractThe average shelf life of pasteurized fluid milk is 10.7 days. The purpose of this study was to examine the possibility of extending this with the application of microwave heat. This would be convenient for the growing number of small households. For these individuals, it is difficult to use a quart of milk in 10.7 days.Pasteurized homogenized milk in 200 ml lots was exposed to 2450 MHz microwave treatment. After 85, 97, 100 and 120 second treatments, the temperatures increased to 45°, 50°, 55° and 60°C respectively. Both Standard Plate Counts and Psychrotrophic Bacteria Counts were dramatically reduced with increasing temperatures. Psychrotrophs were reduced from a level of 1.8 × 106/ml to a nondelegable level when samples were brought to a temperature of 60°C. informal taste tests indicated that microwave-treated 8 day old pasteurized milk heated to a temperature of 60°C had a longer shelf life than the control and all other samples tested.","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"42 1","pages":"269-272"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89817381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
Energy Required to Heat Convenience and Home-Prepared Foods with an Electric Range and a Microwave Oven 用电炉和微波炉加热方便和自制食品所需的能量
The Journal of microwave power Pub Date : 1984-01-01 DOI: 10.1080/16070658.1984.11689354
S. Richardson, J. A. Phillips, J. Axelson, R. P. Lovingood, J. M. Pearson, M. Saltmarch
{"title":"Energy Required to Heat Convenience and Home-Prepared Foods with an Electric Range and a Microwave Oven","authors":"S. Richardson, J. A. Phillips, J. Axelson, R. P. Lovingood, J. M. Pearson, M. Saltmarch","doi":"10.1080/16070658.1984.11689354","DOIUrl":"https://doi.org/10.1080/16070658.1984.11689354","url":null,"abstract":"AbstractEnergy required to heat twenty convenience foods and their home-prepared counterparts with an electric range and a microwave oven was measured. The majority of foods (63.4%) required more energy to heat with the electric range than with the microwave oven. Exceptions were foods normally heated on a surface unit of an electric range. Most home-prepared foods (78.3%) required more energy to heat than did convenience foods. However, some convenience foods stored in the frozen state needed more energy for heating than did comparable home-prepared foods.","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"22 1","pages":"89-95"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85612915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Microwave Drying of Polymers 聚合物的微波干燥
The Journal of microwave power Pub Date : 1984-01-01 DOI: 10.1080/16070658.1984.11689360
N. P. Vasilakos, F. Magalhães
{"title":"Microwave Drying of Polymers","authors":"N. P. Vasilakos, F. Magalhães","doi":"10.1080/16070658.1984.11689360","DOIUrl":"https://doi.org/10.1080/16070658.1984.11689360","url":null,"abstract":"AbstractThe technical feasibility of using microwaves to dry various types of commercial polymers was investigated in batch-mode experiments with a 1-k W microwave generator/cavity. The polymers tested were polypropylene, low-density polyethylene, hydroxyelhyl cellulose, polyisoprene rubber, and vinyl chloride/vinyl acetate copolymer. A variety of microwave-drying conditions was employed, including input power levels between 100 and 1000 W. and sample amounts from 5 to 100 g. A series of drying curves (moisture content versus time) was generated, and changes in the physical properties of the dried materials were determined. The results show that the polyolefin resins, polypropylene and polyethylene, are very good candidates for drying with microwave energy. Hydroxyethyl cellulose and vinyl chloride/vinyl acetate copolymer, on the other hand, demonstrated good potential only under some drying conditions, while for others, severe degradation (burning) of these materials occurred. Finally, polyisoprene rubbe...","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"8 1","pages":"135-144"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89080212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
Density Dependence of the Dielectric Properties of Wheat and Whole-Wheat Flour 小麦和全麦面粉介电特性的密度依赖性
The Journal of microwave power Pub Date : 1984-01-01 DOI: 10.1080/16070658.1984.11689350
S. Nelson
{"title":"Density Dependence of the Dielectric Properties of Wheat and Whole-Wheat Flour","authors":"S. Nelson","doi":"10.1080/16070658.1984.11689350","DOIUrl":"https://doi.org/10.1080/16070658.1984.11689350","url":null,"abstract":"Etablissement d'equations pour le calcul de la constante dielectrique d'un materiau pulverulent ou d'un materiau particulaire a densite donnee : on utilise les mesures effectuees sur grain de ble et sur farine de ble a teneurs en eau de 8,5 a 14,7 %","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"20 1","pages":"55-64"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85506869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 87
On the counting of modes in rectangular cavities 关于矩形腔中模态的计数
The Journal of microwave power Pub Date : 1984-01-01 DOI: 10.1080/16070658.1984.11689368
R. Turner, W. Voss, W. Tinga, H. Baltes
{"title":"On the counting of modes in rectangular cavities","authors":"R. Turner, W. Voss, W. Tinga, H. Baltes","doi":"10.1080/16070658.1984.11689368","DOIUrl":"https://doi.org/10.1080/16070658.1984.11689368","url":null,"abstract":"AbstractSeveral previous attempts to enumerate the eigenmodes in empty rectangular cavities by numerical computation have produced incorrect results, apparently due to a misunderstanding regarding the partial distributions of TE and TM modes. A brief review of the underlying physical principles involved in mode counting is given, along with a presentation of an experimentally verified computer algorithm which illustrates the theory. Revised and extended cavity design tables have been compiled using this algorithm and are given. Numerical and analytical mode distribution calculations are discussed in terms of their utility ni design and analysis of microwave heating cavities.","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"29 1","pages":"199-208"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73814362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Ridged Waveguide Applicators for Uniform Microwave Heating of Sheet Materials 薄板材料均匀微波加热的脊波导应用器
The Journal of microwave power Pub Date : 1984-01-01 DOI: 10.1080/16070658.1984.11689357
El-Deek M. El-Sayed, A. M. Hashem
{"title":"Ridged Waveguide Applicators for Uniform Microwave Heating of Sheet Materials","authors":"El-Deek M. El-Sayed, A. M. Hashem","doi":"10.1080/16070658.1984.11689357","DOIUrl":"https://doi.org/10.1080/16070658.1984.11689357","url":null,"abstract":"AbstractThis paper contains an analysis of wave propagation in ridged rectangular waveguides used as single pass applicators for treating thin dielectric sheet materials with microwave power. Two waveguide configurations with double-tapered and double-inclined ridges symmetrically placed about the center, and loaded with lossy dielectric webs are investigated. The variation of the attenuation coefficient and specific microwave power absorption is illustrated as a function of angle of tapering or inclination. The computed results are given for the standard heating frequency of 2.45 GHz.","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"87 1","pages":"111-117"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81207733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Computer Simulation Predicting Temperature Distributions Generated by Microwave Absorption in Multilayered iedia 多层介质中微波吸收产生的温度分布的计算机模拟
The Journal of microwave power Pub Date : 1984-01-01 DOI: 10.1080/16070658.1984.11689355
C. Wagter
{"title":"Computer Simulation Predicting Temperature Distributions Generated by Microwave Absorption in Multilayered iedia","authors":"C. Wagter","doi":"10.1080/16070658.1984.11689355","DOIUrl":"https://doi.org/10.1080/16070658.1984.11689355","url":null,"abstract":"AbstractA numerical procedure to calculate the time dependence of temperature profiles in multi-layered plane media is described. Discretization of the continuous problem is accomplished by dividing each layer into a number of sublayers. A semi-discrete finite difference method is used to express the temperatures of the sublayers in closed form as a function of the microwave input. Applying the method in an iterative way allows treatment of the non-linear case, which arises when material permittivity is temperature dependent. Numerical results are given to illustrate the versatility of the developed computer program. The simulations are verified experimentally by use of a data acquisition system and a good agreement was found.","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"57 1","pages":"97-105"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81489505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
Resonance suppression in a TEM cell. 透射电镜细胞中的共振抑制。
The Journal of microwave power Pub Date : 1983-12-01 DOI: 10.1080/16070658.1983.11689338
D A Hill, J A Walsh
{"title":"Resonance suppression in a TEM cell.","authors":"D A Hill,&nbsp;J A Walsh","doi":"10.1080/16070658.1983.11689338","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689338","url":null,"abstract":"<p><p>All TEmnp resonances in a TEM cell have been suppressed by cutting the cell walls longitudinally. The TMmnp resonances and propagating TEM mode were not affected. The suppressed resonances have a residual interaction with a biological body inside the cell. Because of this, the modified cell can only be used for bioeffects dosimetry studies at a small number of frequencies above the upper limit for the original cell. Where an accuracy of only +/- 5 dB is required, such as in some EMC studies, the effective bandwidth of the modified cell is twice that of the original cell.</p>","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 4","pages":"325-30"},"PeriodicalIF":0.0,"publicationDate":"1983-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689338","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17429190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
A new coaxial TEM radiofrequency/microwave applicator for non-invasive deep-body hyperthermia. 一种用于非侵入性深部热疗的新型同轴透射电镜射频/微波应用器。
The Journal of microwave power Pub Date : 1983-12-01 DOI: 10.1080/16070658.1983.11689343
J J Lagendijk
{"title":"A new coaxial TEM radiofrequency/microwave applicator for non-invasive deep-body hyperthermia.","authors":"J J Lagendijk","doi":"10.1080/16070658.1983.11689343","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689343","url":null,"abstract":"At the moment great efforts are being made to develop non-invasive heating systems which produce controlled local or regional deep-body hyperthermia. Electromagnetic interference techniques (10-80 MHz) with several separated applicators or with multiple applicators can produce deep-body heating. In our institute a coaxial frequency-independent TEM radiofrequency/microwave applicator has been designed. This applicator can produce a theoretically optimal interference maximum in the centre of the body. The applicator is very simple to construct and inexpensive. To test the design with the equipment available, a scaled prototype of the TEM applicator has been developed. The prototype has a diameter of 20 cm and operates at 434 MHz. The applicator has been tested on several phantom materials. The measured absorbed power distributions are in good agreement with the calculated theoretical distributions. The theoretical calculations of the absorbed power distributions of a 10-80 MHz TEM deep-body applicator are very encouraging.","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 4","pages":"367-75"},"PeriodicalIF":0.0,"publicationDate":"1983-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689343","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17618945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 50
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