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Numerical Analysis of Artificial Electron Heating Effects on Polar Mesospheric Winter Echoes 人工电子加热对极地平流层冬季回波影响的数值分析
Journal of Electronic Science and Technology Pub Date : 2020-10-14 DOI: 10.11989/JEST.1674-862X.80521012
Safi Ullah, Hai-long Li, A. Rauf, Luyao Fu, Maoyan Wang, L. Meng
{"title":"Numerical Analysis of Artificial Electron Heating Effects on Polar Mesospheric Winter Echoes","authors":"Safi Ullah, Hai-long Li, A. Rauf, Luyao Fu, Maoyan Wang, L. Meng","doi":"10.11989/JEST.1674-862X.80521012","DOIUrl":"https://doi.org/10.11989/JEST.1674-862X.80521012","url":null,"abstract":"In this paper, an analytical model is used to analyze the modulated polar mesospheric winter echoes (PMWE). The winter parameters were introduced to simulate the effects of different parameters during the artificial electron heating of PMWE. The important role of the charged dust particle in the creation of PMWE is confirmed again. It is found that during the heating of PMWE, the increases of the dust size, dust charge, electron temperature, initial electron density, and ion-neutral collision frequency cause the increase of the electron density irregularity, and hence the PMWE strength. However, with increasing the dust density, the electron density irregularity and the PMWE strength decrease.","PeriodicalId":53467,"journal":{"name":"Journal of Electronic Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42768861","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
Systematic Synthesis of Compressive VDTA-Based T-T Filter with Orthogonal Control of f o and Q 基于压缩vdta的f与Q正交控制T-T滤波器的系统综合
Journal of Electronic Science and Technology Pub Date : 2020-10-14 DOI: 10.11989/JEST.1674-862X.80328019
Yongan Li, Yan-Hua Xi, Z. Fan
{"title":"Systematic Synthesis of Compressive VDTA-Based T-T Filter with Orthogonal Control of f o and Q","authors":"Yongan Li, Yan-Hua Xi, Z. Fan","doi":"10.11989/JEST.1674-862X.80328019","DOIUrl":"https://doi.org/10.11989/JEST.1674-862X.80328019","url":null,"abstract":"Based on sixteen nullor-mirror models of the voltage differencing transconductance amplifier (VDTA) and port admittance matrices of the tow-Thomas (T-T) filter with orthogonal control between the characteristic frequency (fo) and figure of merit (Q), two different categories of the voltage-mode and transconductance-mode T-T filters are synthesized by the means of the nodal admittance matrix (NAM) expansion method. The category A filter that employs two compressive VDTAs and two grounded capacitors includes four structures, and the category B filter that uses two compressive VDTAs, two grounded capacitors, and one grounded resistor, also includes four structures. These circuits are suitable for integrated circuit manufacture, and their parameters fo and Q can be orthogonally adjusted with varying the bias currents of VDTAs. After the paper and pencil test is completed, the computer analyses, including alternating current (AC), parameter sweep, Monte Carlo (MC), and noise analyses, are performed to support the synthesis approach.","PeriodicalId":53467,"journal":{"name":"Journal of Electronic Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45571235","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
MUSIC-Based Pilot Decontamination and Channel Estimation in Multiuser Massive MIMO System 多用户大规模MIMO系统中基于MUSIC的导频净化与信道估计
Journal of Electronic Science and Technology Pub Date : 2020-10-14 DOI: 10.11989/JEST.1674-862X.80102112
Wei-Chiang Wu
{"title":"MUSIC-Based Pilot Decontamination and Channel Estimation in Multiuser Massive MIMO System","authors":"Wei-Chiang Wu","doi":"10.11989/JEST.1674-862X.80102112","DOIUrl":"https://doi.org/10.11989/JEST.1674-862X.80102112","url":null,"abstract":"This paper addresses the problem of channel estimation in a multiuser multi-cell wireless communications system in which the base station (BS) is equipped with a very large number of antennas (also referred to as “massive multiple-input multiple-output (MIMO)”). We consider a time-division duplexing (TDD) scheme, in which reciprocity between the uplink and downlink channels can be assumed. Channel estimation is essential for downlink beamforming in massive MIMO, nevertheless, the pilot contamination effect hinders accurate channel estimation, which leads to overall performance degradation. Benefitted from the asymptotic orthogonality between signal and interference subspaces for non-overlapping angle-of arrivals (AOAs) in the large-scale antenna system, we propose a multiple signals classification (MUSIC) based channel estimation algorithm during the uplink transmission. Analytical and numerical results verify complete pilot decontamination and the effectiveness of the proposed channel estimation algorithm in the multiuser multi-cell massive MIMO system.","PeriodicalId":53467,"journal":{"name":"Journal of Electronic Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49353756","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
Cyclic-Auto-Correlation Based Timing Estimation Algorithm for Time-Frequency Overlapping Multi-Carrier Signals 基于周期自相关的时频重叠多载波信号时序估计算法
Journal of Electronic Science and Technology Pub Date : 2020-10-14 DOI: 10.11989/JEST.1674-862X.6072918
Xing Zhang, Jianhao Hu
{"title":"Cyclic-Auto-Correlation Based Timing Estimation Algorithm for Time-Frequency Overlapping Multi-Carrier Signals","authors":"Xing Zhang, Jianhao Hu","doi":"10.11989/JEST.1674-862X.6072918","DOIUrl":"https://doi.org/10.11989/JEST.1674-862X.6072918","url":null,"abstract":"In recent years, the time-frequency overlapping multi-carrier signal has been a novel and valuable topic in blind signal processing, especially in the non-cooperative receiving field. But there is little related research in public published papers. This paper proposes two timing estimation algorithms, which are non-data-aided and based on the cyclic auto-correlation function. In order to evaluate the performance of the proposed algorithms, the theoretical bound of the timing estimation is derived. According to the analyses and simulation results, the effectiveness of the proposed algorithms has been demonstrated. It shows that Method I has better performance than Method II. However, Method II does not need prior information, so it has a wider range of applications.","PeriodicalId":53467,"journal":{"name":"Journal of Electronic Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45020065","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
High capacity data rate system: Review of visible light communications technology 高容量数据速率系统:可见光通信技术综述
Journal of Electronic Science and Technology Pub Date : 2020-09-01 DOI: 10.1016/j.jnlest.2020.100055
Augustus Ehiremen Ibhaze , Patience Ebehiremen Orukpe , Frederick Obataimen Edeko
{"title":"High capacity data rate system: Review of visible light communications technology","authors":"Augustus Ehiremen Ibhaze ,&nbsp;Patience Ebehiremen Orukpe ,&nbsp;Frederick Obataimen Edeko","doi":"10.1016/j.jnlest.2020.100055","DOIUrl":"10.1016/j.jnlest.2020.100055","url":null,"abstract":"<div><p>Wireless communications have become an integral part of global convergence as global connectedness has gradually become dependent on its efficient deployment. The need for “more-broadband” techniques in relation to the ever increasing growth rate of the data hungry society now necessitates novel techniques for the high-speed data transmission. While advancements have been made in this regard, the projection of having an eventual Internet of everything (IoE) deployment will result in an unimaginable transmission data rate requirement as huge data traffic will be conveyed per time within the communications network, which will require a capacity upgrade of the existing infrastructure. Visible light communications (VLCs), as an integral part of optical wireless communications (OWCs), have been reviewed in this article, having the capacity to extend the achievable data rate requirement of the wireless communications network. The technologies, techniques, and best practices have been presented alongside technology integration for the seamless high capacity wireless broadband deployment.</p></div>","PeriodicalId":53467,"journal":{"name":"Journal of Electronic Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jnlest.2020.100055","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42815234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
Magneto-optical properties of wider gap semiconductors ZnMnTe and ZnMnSe films prepared by MBE MBE制备宽间隙半导体ZnMnTe和ZnMnSe薄膜的磁光特性
Journal of Electronic Science and Technology Pub Date : 2020-09-01 DOI: 10.1016/j.jnlest.2020.100056
Masaaki Imamura , Daisuke Tashima , Jiro Kitagawa , Hironori Asada
{"title":"Magneto-optical properties of wider gap semiconductors ZnMnTe and ZnMnSe films prepared by MBE","authors":"Masaaki Imamura ,&nbsp;Daisuke Tashima ,&nbsp;Jiro Kitagawa ,&nbsp;Hironori Asada","doi":"10.1016/j.jnlest.2020.100056","DOIUrl":"10.1016/j.jnlest.2020.100056","url":null,"abstract":"<div><p>The II-VI based magnetic semiconductors with a direct and wide optical bandgap are expected to show high potential for optical applications utilizing short wavelength laser diodes (LDs), such as 532-nm green and 475-nm blue LDs. We have confirmed that the Faraday rotation <em>θ</em><sub><em>F</em></sub> in the ZnMnTe and ZnMnSe films deposited on quartz glass (QG) and sapphire (SA) substrates by using molecular beam epitaxy (MBE) is large near the absorption edge. This paper reports the magneto-optical properties of ZnMnTe and ZnMnSe films synthesized on the QG and SA substrates, and shows the result of a direct Faraday rotation observation successfully made for the ZnMnTe films under 1.28-kHz alternating magnetic fields. The optical absorption characteristics of the ZnMnTe films grown on the SA substrates by MBE are discussed by comparing them with the optical absorption properties and photoluminescence spectra of the II-VI ZnTe parent single crystals.</p></div>","PeriodicalId":53467,"journal":{"name":"Journal of Electronic Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jnlest.2020.100056","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42921126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Development of 3D scanning system for robotic plasma processing of medical products with complex geometries 复杂几何形状医疗产品机器人等离子体加工三维扫描系统的开发
Journal of Electronic Science and Technology Pub Date : 2020-09-01 DOI: 10.1016/j.jnlest.2020.100057
Darya L. Alontseva , Elaheh Ghassemieh , Alexander L. Krasavin , Albina T. Kadyroldina
{"title":"Development of 3D scanning system for robotic plasma processing of medical products with complex geometries","authors":"Darya L. Alontseva ,&nbsp;Elaheh Ghassemieh ,&nbsp;Alexander L. Krasavin ,&nbsp;Albina T. Kadyroldina","doi":"10.1016/j.jnlest.2020.100057","DOIUrl":"10.1016/j.jnlest.2020.100057","url":null,"abstract":"<div><p>This paper describes the development of an intelligent automated control system of a robot manipulator for plasma treatment of medical implants with complex shapes. The two-layer coatings from the Ti wire and hydroxyapatite powders are applied on the surface of Ti medical implants by microplasma spraying to increase the biocompatibility of implants. The coating process requires precise control of a number of parameters, particularly the plasma spray distance and plasma jet traverse velocity. Thus, the development of the robotic plasma surface treatment involves automated path planning. The key idea of the proposed intelligent automatic control system is the use of data of preliminary three-dimensional (3D) scanning of the processed implant by the robot manipulator. The segmentation algorithm of the point cloud from laser scanning of the surface is developed. This methodology is suitable for robotic 3D scanning systems with both non-contact laser distance sensors and video cameras, used in additive manufacturing and medicine.</p></div>","PeriodicalId":53467,"journal":{"name":"Journal of Electronic Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jnlest.2020.100057","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48443629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Consensus based least squares estimation for single-integrator multi-agent systems with a time-varying reference state 时变参考状态单积分器多智能体系统的一致性最小二乘估计
Journal of Electronic Science and Technology Pub Date : 2020-06-01 DOI: 10.1016/j.jnlest.2020.100053
Ali Alouache, Qing-He Wu
{"title":"Consensus based least squares estimation for single-integrator multi-agent systems with a time-varying reference state","authors":"Ali Alouache,&nbsp;Qing-He Wu","doi":"10.1016/j.jnlest.2020.100053","DOIUrl":"10.1016/j.jnlest.2020.100053","url":null,"abstract":"<div><p>This paper discusses consensus tracking of single-integrator multi-agent systems with a time varying reference state based on the least squares estimation theory to deal with the case of communications disturbance. Since none of the followers can communicate with the leader within the accepted time due to communications disturbance, least squares estimation is applied for online estimation of the time varying reference state and reducing the tracking errors occurred due to communications disturbance. A theoretical proof is provided under some assumptions while the necessary and sufficient conditions are demonstrated for which consensus is reached on the time-varying reference state in case of communications disturbance. Finally, a Matlab example is given to validate the effectiveness of the proposed approach.</p></div>","PeriodicalId":53467,"journal":{"name":"Journal of Electronic Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jnlest.2020.100053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41315485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis of octapod Cu–Au bimetallic nanocrystal with concave structure through galvanic replacement reaction 电取代法制备凹形八足铜金双金属纳米晶
Journal of Electronic Science and Technology Pub Date : 2020-06-01 DOI: 10.1016/j.jnlest.2020.100046
Zhenni Wang , Qiang Li , Zhenhuan Zhao, Xiaomie Tong
{"title":"Synthesis of octapod Cu–Au bimetallic nanocrystal with concave structure through galvanic replacement reaction","authors":"Zhenni Wang ,&nbsp;Qiang Li ,&nbsp;Zhenhuan Zhao,&nbsp;Xiaomie Tong","doi":"10.1016/j.jnlest.2020.100046","DOIUrl":"10.1016/j.jnlest.2020.100046","url":null,"abstract":"<div><p>We synthesized octapod Cu–Au bimetallic alloy with a concave structure by employing a replacement reaction between AuPPh<sub>3</sub>Cl and Cu nanocubes. Using Cu nanocube as sacrificial templates, we have successfully generated high-active sites on alloy nanocrystals by carefully tuning the replacement reaction and growth. The key is to afford the proper concentration of AuPPh<sub>3</sub>Cl-TOP to the reaction solution. When the Au precursor with high concentration is injected into the galvanic replacement reaction, growth dominates the process, hollowed octapod Cu–Au alloy was obtained. In contrast, when the concentration of the Au precursor is low, the replacement reaction can only take place at the nanocrystals, leading to generated Cu–Au nanocages. This work provides an effective strategy for the preparation of hollow bimetallic nanocrystals with high-active sites.</p></div>","PeriodicalId":53467,"journal":{"name":"Journal of Electronic Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jnlest.2020.100046","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48063559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A green strategy to synthesize Ag/Ag3PO4/chitosan composite photocatalysts and their photocatalytic degradation performance under visible-light irradiation Ag/Ag3PO4/壳聚糖复合光催化剂的绿色合成及其可见光下的光催化降解性能
Journal of Electronic Science and Technology Pub Date : 2020-06-01 DOI: 10.1016/j.jnlest.2020.100019
Pengcheng Wu , Huili Peng , Yuhan Wu , Lei Li , Xiaorui Hao , Banghua Peng , Guihua Meng , Jianning Wu , Zhiyong Liu
{"title":"A green strategy to synthesize Ag/Ag3PO4/chitosan composite photocatalysts and their photocatalytic degradation performance under visible-light irradiation","authors":"Pengcheng Wu ,&nbsp;Huili Peng ,&nbsp;Yuhan Wu ,&nbsp;Lei Li ,&nbsp;Xiaorui Hao ,&nbsp;Banghua Peng ,&nbsp;Guihua Meng ,&nbsp;Jianning Wu ,&nbsp;Zhiyong Liu","doi":"10.1016/j.jnlest.2020.100019","DOIUrl":"10.1016/j.jnlest.2020.100019","url":null,"abstract":"<div><p>In this work, a plasmonic Ag/Ag<sub>3</sub>PO<sub>4</sub>/Chitosan composite photocatalyst was prepared by a low-temperature strategy. Environmentally friendly chitosan plays triple vital roles in this composite. First, it was devoted to <em>in situ</em> reduce metallic silver from silver ions of Ag<sub>3</sub>PO<sub>4</sub>. Also, as a carrier of Ag/Ag<sub>3</sub>PO<sub>4</sub> nanoparticles, chitosan can effectively prevent aggregation. Furthermore, benefiting from the settlement of hydrophilic chitosan, the prepared composite could be easily separated and recovered from the solution system. X-ray diffraction, scanning electron microscope, energy-dispersive X-ray spectroscopy, UV–visible diffused reflectance spectroscopy and X-ray photoelectron spectroscopy were employed to characterize the properties of materials. The results of photo-decomposition testing showed that the Ag/Ag<sub>3</sub>PO<sub>4</sub>/Chitosan composite possessed a good activity for the decomposition of Rhodamine B (RhB) under visible light.</p></div>","PeriodicalId":53467,"journal":{"name":"Journal of Electronic Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jnlest.2020.100019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46006084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
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