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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
Q1 Engineering 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
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.
本文利用一个分析模型对调制极地中层冬季回波(PMWE)进行了分析。引入冬季参数来模拟不同参数对PMWE人工电子加热的影响。带电尘埃粒子在PMWE产生中的重要作用再次得到证实。研究发现,在PMWE的加热过程中,灰尘尺寸、灰尘电荷、电子温度、初始电子密度和离子中性碰撞频率的增加导致电子密度不规则性的增加,从而导致PMWE强度的增加。然而,随着粉尘密度的增加,电子密度的不规则性和PMWE强度降低。
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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
Q1 Engineering Pub Date : 2020-10-14 DOI: 10.11989/JEST.1674-862X.80328019
Yongan Li, Yan-Hua Xi, Z. Fan
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.
基于压差跨导放大器(VDTA)的16个零镜像模型和具有特性频率(fo)和品质因数(Q)之间的正交控制的双托马斯(T-T)滤波器的端口导纳矩阵,采用节点导纳矩阵(NAM)展开法合成了两类不同类型的电压型和跨导型T-T滤波器。使用两个压缩VDTA和两个接地电容器的A类滤波器包括四个结构,使用两个压力VDTA、两个接地电容器和一个接地电阻器的B类滤波器也包括四个构造。这些电路适用于集成电路制造,并且它们的参数fo和Q可以通过改变VDTA的偏置电流来正交地调整。纸笔测试完成后,进行了计算机分析,包括交流(AC)、参数扫描、蒙特卡罗(MC)和噪声分析,以支持综合方法。
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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
Q1 Engineering Pub Date : 2020-10-14 DOI: 10.11989/JEST.1674-862X.80102112
Wei-Chiang Wu
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.
本文解决了多用户多小区无线通信系统中的信道估计问题,其中基站(BS)配备了大量天线(也称为“大规模多输入多输出(MIMO)”)。我们考虑一种时分双工(TDD)方案,其中可以假设上行链路和下行链路信道之间的互易性。信道估计对于大规模MIMO中的下行链路波束形成至关重要,然而,导频污染效应阻碍了准确的信道估计,从而导致整体性能下降。得益于大规模天线系统中非重叠到达角(AOA)的信号子空间和干扰子空间之间的渐近正交性,我们提出了一种基于多信号分类(MUSIC)的上行链路传输信道估计算法。分析和数值结果验证了所提出的信道估计算法在多用户多小区大规模MIMO系统中的完全导频净化和有效性。
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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
Q1 Engineering Pub Date : 2020-10-14 DOI: 10.11989/JEST.1674-862X.6072918
Xing Zhang, Jianhao Hu
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.
近年来,时频重叠多载波信号在盲信号处理中,特别是在非协作接收领域,成为一个新颖而有价值的课题。但在公开发表的论文中,相关研究很少。本文提出了两种基于循环自相关函数的非数据辅助定时估计算法。为了评估所提出算法的性能,推导了定时估计的理论界。根据分析和仿真结果,验证了所提算法的有效性。结果表明,方法一比方法二具有更好的性能。然而,方法II不需要先验信息,因此其应用范围更广。
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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
Q1 Engineering Pub Date : 2020-09-01 DOI: 10.1016/j.jnlest.2020.100055
Augustus Ehiremen Ibhaze , Patience Ebehiremen Orukpe , Frederick Obataimen Edeko

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.

无线通信已成为全球融合的重要组成部分,全球连通性逐渐依赖于无线通信的高效部署。对“更宽带”技术的需求与数据饥渴社会不断增长的增长率有关,现在需要新的高速数据传输技术。虽然在这方面取得了进展,但最终部署万物互联(IoE)的预测将导致难以想象的传输数据速率要求,因为每次将在通信网络内传输巨大的数据流量,这将需要对现有基础设施进行容量升级。可见光通信(vlc)作为光无线通信(OWCs)的重要组成部分,具有扩展无线通信网络可达到的数据速率要求的能力。这些技术、技巧和最佳实践已经与无缝高容量无线宽带部署的技术集成一起提出。
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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
Q1 Engineering Pub Date : 2020-09-01 DOI: 10.1016/j.jnlest.2020.100056
Masaaki Imamura , Daisuke Tashima , Jiro Kitagawa , Hironori Asada

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 θF 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.

基于II-VI的磁性半导体具有直接和宽的光学带隙,有望在利用短波长的激光二极管(ld)的光学应用中显示出很高的潜力,例如532纳米的绿色和475纳米的蓝色ld。在石英玻璃(QG)和蓝宝石(SA)衬底上采用分子束外延(MBE)沉积的ZnMnTe和ZnMnSe薄膜中,法拉第旋转θF在吸收边缘附近较大。本文报道了在QG和SA衬底上合成的ZnMnTe和ZnMnSe薄膜的磁光性质,并展示了在1.28 khz交变磁场下成功地对ZnMnTe薄膜进行直接法拉第旋转观察的结果。通过与II-VI型ZnTe母体单晶的光吸收特性和光致发光光谱的比较,讨论了MBE法生长在SA衬底上的ZnMnTe薄膜的光吸收特性。
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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
Q1 Engineering Pub Date : 2020-09-01 DOI: 10.1016/j.jnlest.2020.100057
Darya L. Alontseva , Elaheh Ghassemieh , Alexander L. Krasavin , Albina T. Kadyroldina

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.

本文介绍了一种用于复杂形状医用植入物等离子体处理的机器人机械手智能自动控制系统的研制。采用微等离子体喷涂技术将钛丝和羟基磷灰石粉末制成的两层涂层涂在钛医用植入物表面,以提高植入物的生物相容性。涂层过程需要精确控制许多参数,特别是等离子体喷射距离和等离子体射流穿越速度。因此,机器人等离子体表面处理的发展涉及到自动路径规划。所提出的智能自动控制系统的核心思想是利用机器人机械手对被加工植入体进行初步三维扫描的数据。提出了激光扫描表面点云的分割算法。该方法适用于具有非接触式激光距离传感器和摄像机的机器人3D扫描系统,用于增材制造和医学。
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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
Q1 Engineering Pub Date : 2020-06-01 DOI: 10.1016/j.jnlest.2020.100053
Ali Alouache, Qing-He Wu

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.

本文讨论了基于最小二乘估计理论的具有时变参考状态的单积分器多智能体系统的一致性跟踪,以处理通信干扰情况。由于受通信干扰的影响,follower无法在允许的时间内与leader进行通信,因此采用最小二乘估计对时变参考状态进行在线估计,减少了由于通信干扰而产生的跟踪误差。在一定的假设条件下给出了理论证明,同时给出了在通信干扰情况下时变参考状态达成一致的充分必要条件。最后,通过Matlab实例验证了该方法的有效性。
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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
Q1 Engineering Pub Date : 2020-06-01 DOI: 10.1016/j.jnlest.2020.100046
Zhenni Wang , Qiang Li , Zhenhuan Zhao, Xiaomie Tong

We synthesized octapod Cu–Au bimetallic alloy with a concave structure by employing a replacement reaction between AuPPh3Cl 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 AuPPh3Cl-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.

我们利用AuPPh3Cl与Cu纳米立方之间的取代反应合成了具有凹结构的八足Cu - au双金属合金。利用Cu纳米立方作为牺牲模板,通过调整取代反应和生长,我们成功地在合金纳米晶体上生成了高活性位点。关键是给反应溶液提供合适浓度的AuPPh3Cl-TOP。在电替换反应中注入高浓度的Au前驱体,生长过程占主导地位,得到空心八足体Cu-Au合金。相反,当Au前驱体浓度较低时,取代反应只能发生在纳米晶体上,导致生成Cu-Au纳米笼。本研究为制备具有高活性位的空心双金属纳米晶体提供了一种有效的策略。
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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
Q1 Engineering 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

In this work, a plasmonic Ag/Ag3PO4/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 in situ reduce metallic silver from silver ions of Ag3PO4. Also, as a carrier of Ag/Ag3PO4 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/Ag3PO4/Chitosan composite possessed a good activity for the decomposition of Rhodamine B (RhB) under visible light.

本文采用低温策略制备了等离子体Ag/Ag3PO4/壳聚糖复合光催化剂。环境友好型壳聚糖在这种复合材料中起着三重重要作用。首先,研究了Ag3PO4银离子原位还原金属银的方法。壳聚糖作为Ag/Ag3PO4纳米粒子的载体,可以有效地防止Ag/Ag3PO4的聚集。此外,得益于亲水性壳聚糖的沉降,制备的复合材料易于从溶液体系中分离和回收。利用x射线衍射、扫描电子显微镜、能量色散x射线能谱、紫外-可见漫反射能谱和x射线光电子能谱对材料的性质进行表征。光分解测试结果表明,Ag/Ag3PO4/壳聚糖复合材料在可见光下对罗丹明B (Rhodamine B, RhB)具有良好的分解活性。
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引用次数: 11
期刊
Journal of Electronic Science and Technology
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