电磁分析与应用期刊(英文)最新文献_第2页

Theoretical Study on Spherical Composite Accelerating Cavity 球形复合材料加速腔的理论研究

电磁分析与应用期刊(英文) Pub Date : 2022-01-01 DOI: 10.4236/jemaa.2022.144004

Xiufang Tian, Haiyan Meng, Cuihua Li, Hongyan Li

引用次数: 0

Wireless Charger Design of Robot Vacuum Cleaners with Power Repeaters for High Compatibility 具有高兼容性电源中继器的机器人真空吸尘器无线充电器设计

电磁分析与应用期刊(英文) Pub Date : 2022-01-01 DOI: 10.4236/jemaa.2022.145005

Anglin Li, D. Kacprzak, A. Hu

{"title":"Wireless Charger Design of Robot Vacuum Cleaners with Power Repeaters for High Compatibility","authors":"Anglin Li, D. Kacprzak, A. Hu","doi":"10.4236/jemaa.2022.145005","DOIUrl":"https://doi.org/10.4236/jemaa.2022.145005","url":null,"abstract":"Curved coils constructed by flexible printed circuit board (PCB) or hand-wound Litz-wire have been steadily becoming popular due to its applicable potential on devices that have a curved body. Inductive Power Transfer (IPT) systems based on curved coils and flexible ferrite sheets may provide more flexible charging solutions for various electronic devices such as rice cookers and robot vacuum cleaners. Power repeaters are also used in IPT systems to extend wireless charging range by guiding magnetic fields to the receiving coil. The interaction of these three topics could be inspiring. In this paper, two adjustable power repeaters are applied to an IPT charging system with various curved receiving coils designed for vacuum cleaners. Two power repeaters share the identical structure as the Tx coil and could be rotated to mirror symmetrically. The input and output power are calculated by analyzing the equivalent circuit model. The self-inductance, mutual inductance, and coupling coefficient of the proposed system are obtained via finite element method simulation with variable rotating angles. Three typical IPT designs have also been simulated in ANSYS Maxwell and compared with the proposed magnetic design. The comparison indicates the enhancing feature of the passive power repeaters on coupling performance and the ability to guide the magnetic flux for better magnetic field coupling. Furthermore, two types of co-simulations defined by the power source via Simplorer are conducted to explore how much power could be transferred. The tuned system is shown to be able to provide about 32 W under 100 kHz operating frequency for charging the battery of a robot vacuum cleaner. The results from theoretical calculation and simulation align well with each other.","PeriodicalId":58231,"journal":{"name":"电磁分析与应用期刊(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70292940","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: 0

Radiation Phenomenon Due to Streamers of Sprites 精灵飘带造成的辐射现象

电磁分析与应用期刊(英文) Pub Date : 2022-01-01 DOI: 10.4236/jemaa.2022.143003

Meenu Singh, Pradosh Kumar Sharma, Parmanand Prakash Pathak

引用次数: 1

Efficient BTCS + CTCS Finite Difference Scheme for General Linear Second Order PDE 一般线性二阶偏微分方程的高效BTCS + CTCS有限差分格式

电磁分析与应用期刊(英文) Pub Date : 2021-10-19 DOI: 10.4236/jemaa.2021.1310010

Gueye Serigne Bira, Mbow Cheikh, D. M. Fadel

引用次数: 0

A Qualitative Analysis of the Diameter of Long Positive Jet Streamer above Thundercloud in Uniform Atmosphere 均匀大气中雷暴云上方长正喷流直径的定性分析

电磁分析与应用期刊(英文) Pub Date : 2021-09-18 DOI: 10.4236/jemaa.2021.139009

Avnish Kumar, P. P. Pathak

{"title":"A Qualitative Analysis of the Diameter of Long Positive Jet Streamer above Thundercloud in Uniform Atmosphere","authors":"Avnish Kumar, P. P. Pathak","doi":"10.4236/jemaa.2021.139009","DOIUrl":"https://doi.org/10.4236/jemaa.2021.139009","url":null,"abstract":"A qualitative analysis of the diameter of the spherical head of a long positive Jet streamer above thundercloud is presented in this paper under uniform atmospheric condition for streamers of less than 7 km length. In this study, an attempt is made to replicate laboratory-based point electrode discharge model for jet streamers originating above the thunderclouds. In laboratory conditions, it is not possible to produce huge electrode potentials which could be the reason that the streamers generated under the controlled lab environment have diameter of the order of only a few centimeter and length of a few millimeter. On the other hand, the thunderclouds carry huge electrical charges, for example 50 C, which can produce huge electrical potentials of the order of several hundred MeV. Such huge potential can act as the potential of a point electrode which may be capable of producing very large and thicker streamers above the thunderclouds. So, a leader mechanism of streamer initiation is assumed in calculations as the tip of conducting leader channel can act as point electrode carrying huge cloud potential to generate large streamers. It is found in this study that as the streamer moves larger distance away from the electrode (leader tip), the diameter of the streamer head decreases. Higher the potential of the electrode (leader tip), thicker is the streamer and more slowly the diameter decreases. Also, it is also found in our calculations that for higher electrode (leader tip) potential lower is the altitude of initiation of streamers.","PeriodicalId":58231,"journal":{"name":"电磁分析与应用期刊(英文)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47453469","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: 0

Prediction of Water Content of Eucalyptus Leaves Using 2.4 GHz Radio Wave 2.4GHz无线电波预测桉树叶片含水量

电磁分析与应用期刊(英文) Pub Date : 2021-08-27 DOI: 10.4236/jemaa.2021.138008

S. Peden, Ronald C. Bradbury, D. Lamb, M. Hedley

引用次数: 0

Negative Resistance and Its Impact on a RC-DC Driven Electric Circuit 负电阻及其对RC-DC驱动电路的影响

电磁分析与应用期刊(英文) Pub Date : 2021-07-31 DOI: 10.4236/jemaa.2021.137007

H. Sarafian

{"title":"Negative Resistance and Its Impact on a RC-DC Driven Electric Circuit","authors":"H. Sarafian","doi":"10.4236/jemaa.2021.137007","DOIUrl":"https://doi.org/10.4236/jemaa.2021.137007","url":null,"abstract":"It is a common misconception that electric “resistance” always is a positive defined electric element. i.e., the plot of the voltage across the resistor, V vs. its current, i is a slanted straight line with a positive slope. Esaki diode also known as tunnel diode is an exception to this character. For a certain voltage range, the current recedes resulting in a line with a negative slope; it is interpreted as negative resistance. In this research flavored report, we investigate the impact of the negative resistance in a typical classic electric circuit. E.g., a tunnel diode, D is inserted in a classic electric circuit that is composed of an ohmic resistor, R and a capacitor, C which are all in series with a DC power supply. The circuit equation for the RCD circuit is a nonlinear ordinary differential equation (NLODE). In line with the ever-growing popular Computer Algebra System (CAS), this is solved numerically utilizing two distinctly different CASs. The consistency of the solutions confidently leads to the understanding of the impact of the negative resistance. The circuit characteristics are compared to the classic analogous RC circuit. The report embodies an atlas of characteristics of the circuits making the analysis visually comprehensible.","PeriodicalId":58231,"journal":{"name":"电磁分析与应用期刊(英文)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46614235","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

RF Loss Model for Tree Canopies with Varying Water Content 不同含水量林冠的射频损耗模型

电磁分析与应用期刊(英文) Pub Date : 2021-07-28 DOI: 10.4236/jemaa.2021.136006

S. Peden, Ronald C. Bradbury, D. Lamb, M. Hedley

引用次数: 0

Point Charge between Two Grounded and Conducting Planes Forming a 60° Angle and for Yukawa’s Potential and Coulomb’s Potential 两个接地和导电平面之间形成60°角和汤川势和库仑势的点电荷

电磁分析与应用期刊(英文) Pub Date : 2021-06-04 DOI: 10.4236/JEMAA.2021.134004

M. A. López-Mariño, Omar Olmos López, José Manuel Pardo Regueiro

引用次数: 0

AC Back Surface Recombination Velocity in n＋-p-p＋ Silicon Solar Cell under Monochromatic Light and Temperature 单色光和温度下n+-p-p+硅太阳能电池交流背表面复合速度

电磁分析与应用期刊(英文) Pub Date : 2021-05-31 DOI: 10.4236/jemaa.2021.135005

Mame Faty Mbaye Fall, I. Gaye, D. Diarisso, G. Diop, Khady Loum, Nafy Diop, Khalidou Mamadou Sy, M. Ndiaye, G. Sissoko

引用次数: 3