The Journal of microwave power最新文献_第7页

The measurement of lung water content. 肺含水量的测定。

The Journal of microwave power Pub Date : 1983-09-01 DOI: 10.1080/16070658.1983.11689330

N C Staub

引用次数: 12

A dual vial waveguide exposure facility for examining microwave effects in vitro. 一种用于检测体外微波效应的双瓶波导暴露装置。

The Journal of microwave power Pub Date : 1983-06-01 DOI: 10.1080/16070658.1983.11689317

S T Lu, N J Roberts, S M Michaelson

{"title":"A dual vial waveguide exposure facility for examining microwave effects in vitro.","authors":"S T Lu, N J Roberts, S M Michaelson","doi":"10.1080/16070658.1983.11689317","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689317","url":null,"abstract":"A waveguide exposure system operated between 2 and 4 GHz was assembled in a laboratory incubator in order to study potential temperature-dependent and temperature-independent actions of microwaves. Two vials containing cell cultures were exposed simultaneously in a single waveguide in order to reduce the space required, and to allow concurrent study of autologous cell cultures in two different functional states (resting and stimulated) during exposure. Dosimetry was performed using three techniques with different underlying assumptions, as well as the technique of differential power measurement. Each of the four techniques yielded different results, although differences between the two vials using any single technique were negligible. A significant 'hot spot' occurred at the center of each vial. The ratio between maximum and minimum absorption rate within a single vial was 33-fold using a vial of 1.2-cm diameter and 1.6-cm height. With agitation and exposure at specific absorption rate (SAR) equal to 21 mW/ml, the thermal gradient was less than 0.1 degrees C between these two points. The averaged SAR can be determined by steady-state heating analysis. The exposure system can be calibrated readily by calculation for the measured powers, but not by differential power measurement.","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 2","pages":"121-31"},"PeriodicalIF":0.0,"publicationDate":"1983-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689317","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17613897","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

Tissue cooling and its effect on brightness temperatures by contact-type microwave applicators. 接触式微波涂抹器对组织冷却及其对亮度温度的影响。

The Journal of microwave power Pub Date : 1983-06-01 DOI: 10.1080/16070658.1983.11689316

M Miyakawa

引用次数: 3

The performance of a new 915-MHz direct contact applicator with reduced leakage. 新型915-MHz直接接触涂抹器的性能，减少泄漏。

The Journal of microwave power Pub Date : 1983-06-01 DOI: 10.1080/16070658.1983.11689318

G Kantor, D M Witters

{"title":"The performance of a new 915-MHz direct contact applicator with reduced leakage.","authors":"G Kantor, D M Witters","doi":"10.1080/16070658.1983.11689318","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689318","url":null,"abstract":"The technical feasibility of commercially developing a safe and effective direct contact diathermy applicator operating at the industrial, scientific, medical (ISM) frequency of 915 MHz is demonstrated. The basic design consists of a circular waveguide which is internally loaded with two orthogonal pairs of forward ridges to obtain circular polarization and two rear ridges with a probe to excite the guide. Two prototype designs are considered: the small applicator (15 cm diameter) has one annular choke covered with a 2.5-cm thick microwave absorber, and the large applicator (25 cm diameter) has two additional concentric chokes to limit leakage radiation. The performance of the applicators was evaluated in terms of the requirements of a ORH microwave diathermy test protocol to control stray radiation and deliver a thermally effective absorbed dose rate to simulated muscle tissue of a phantom with a 1-cm or 2-cm fat layer. The net power required to deliver a thermally effective 235-W/kg specific absorption rate (SAR) to such a planar phantom was determined. For this net power, leakage levels considerably less than 5 mW/cm2 (at 5 cm from applicator-phantom boundary) were obtained for the applicators in direct contact with the phantom. If a small spacing (1 cm) between these applicators and planar phantoms is introduced, the net power required to deliver an effective SAR to a phantom and the associated leakage can become excessive. For the small applicator, the required net power for inducing an SAR of 235 W/kg in muscle tissue of a 1-cm fat layer phantom is about 330 W and the leakage is about 120 mW/cm2. For a 2-cm fat layer phantom, these values are somewhat higher. For the large applicator, using a 1-cm fat layer phantom, the values are about 200 W and about 17 mW/cm2. Again, for a 2-cm fat layer phantom, these values are somewhat higher.","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 2","pages":"133-42"},"PeriodicalIF":0.0,"publicationDate":"1983-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689318","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17613898","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

Technical note: on changes in evaporative heat loss that result from exposure to nonionizing electromagnetic radiation. 技术说明:关于暴露于非电离电磁辐射引起的蒸发热损失的变化。

The Journal of microwave power Pub Date : 1983-06-01 DOI: 10.1080/16070658.1983.11689325

E R Adair, D E Spiers, J A Stolwijk, C B Wenger

引用次数: 12

Temperature gradients in the microwave-irradiated egg: implications for avian teratogenesis. 微波辐照鸡蛋的温度梯度:对禽类致畸的影响。

The Journal of microwave power Pub Date : 1983-06-01 DOI: 10.1080/16070658.1983.11689322

R L Clarke, D R Justesen

{"title":"Temperature gradients in the microwave-irradiated egg: implications for avian teratogenesis.","authors":"R L Clarke, D R Justesen","doi":"10.1080/16070658.1983.11689322","DOIUrl":"https://doi.org/10.1080/16070658.1983.11689322","url":null,"abstract":"Five experiments were performed on a total of 60 non-fertile eggs of Gallus gallus to determine the spatial character, persistence, and physical basis of thermal gradients after a 300-s exposure to the intense, multipath, 2.45-GHz yield of a multimode cavity (dose rates: approximately 80 to 120 mW/g). After irradiation of an intact egg that was first equilibrated to the ambient temperature, a 3-mm diameter Plexiglas rod, which was fitted with junctions of four microwire thermocouples at 10-mm intervals, was inserted to place the distal junction in the approximate center of the yolk, the most proximal junction in peripheral thin white. Temperatures measured immediately after irradiation revealed a highly reliable linear gradient of mean temperatures from central yolk to peripheral white (P less than 0.001). The gradient was also highly persistent: Mean temperatures of central yolk exceeded those of outer thin white by more than 4 degrees C 5 minutes after irradiation, and by more than 2 degrees C 60 minutes afterward. In contrast, when an egg's contents were mixed before irradiation, the gradient was effectively eliminated. A previous report of athermally induced (field-specific) teratogenesis in chick embryos is placed under an interpretive cloud by the present findings: Terata emerged from eggs that were structurally intact during microwave irradiation, but estimates of maxima of embryonic temperatures were based on thermal measurements of non-fertile eggs the contents of which had been mixed by a thermal probe before irradiation.","PeriodicalId":76653,"journal":{"name":"The Journal of microwave power","volume":"18 2","pages":"169-80"},"PeriodicalIF":0.0,"publicationDate":"1983-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16070658.1983.11689322","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17613413","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: 10

Reliability of microwave heating for hemoderivative thawing. 微波加热血液衍生物解冻的可靠性。

The Journal of microwave power Pub Date : 1983-06-01 DOI: 10.1080/16070658.1983.11689321

A Checcucci, G Benelli, M Duminuco, M L Gaetani, P Paoletti, S Vannini, M Morfini

引用次数: 8

Bandwidth limitations of TEM cells due to resonances. 由共振引起的TEM单元的带宽限制。

The Journal of microwave power Pub Date : 1983-06-01 DOI: 10.1080/16070658.1983.11689323

D A Hill

引用次数: 64

Theoretical Analysis of Arcing Structure in Microwave Owens 微波欧文斯电弧结构的理论分析

The Journal of microwave power Pub Date : 1983-01-01 DOI: 10.1080/16070658.1983.11689340

T. Ishii

引用次数: 5

Electromagnetic Techniques in the Development of Coal-Derived Energy Sources – A Review 电磁技术在煤源能源开发中的应用综述

The Journal of microwave power Pub Date : 1983-01-01 DOI: 10.1080/16070658.1983.11689309

C. Balanis

引用次数: 4