利用TSA/Opal技术实现肾活检石蜡切片多重免疫荧光染色

肾活检病理是肾小球疾病诊断的金标准[1],诊断的手段包括光镜、免疫荧光和电镜。三种观察方法对组织处理的要求不同,因此穿刺的肾活检标本需要人为地进行分割。这一操作容易造成某一观察项目没有肾小球的情况,此外也无法在同一肾小球中同时进行光镜、免疫荧光及电镜观察。尽管在体视镜或普通光学显微镜下分割肾组织可以尽量避免没有肾小球的情况,但操作非常依赖穿刺医师的水平,且对于出现硬化或缺血肾小球的组织,即使在显微镜下辨别穿刺组织中的肾小球亦非常困难。更重要的是,对于仅表现为局灶性病变的疾病,人为分割很可能导致在一个检查项目中观察到病变,在另外的检查项目中观察不到。此外,三种观察手段的观察重点不同,免疫荧光主要观察是否存在免疫复合物及补体的沉积,光镜主要观察整体的形态学改变,电镜则主要观察超微结构异常。尽管三种观察方法是分开的,但我们需要整合三种观察内容对疾病进行整体分析,因此假如在同一肾小球中能同时获得免疫、形态学和超微结构的信息更有利于我们做出准确的诊断和开展发病机制的研究。

非连续性文本阅读学生易错成因及教学对策——基于TSA阅读测试数据的结果分析

非连续性文本是英语阅读测试的重点。随着数字时代的到来,文本呈现出明显的多模态化和多元化特征,对学生的阅读素养提出了更高的要求。文章以沿海S市小学五年级学生为研究对象,利用SOLO理论对受试对象在TSA非连续性文本阅读测试中的表现进行分析。结果显示:学生具备语言基础知识,在低层级区间思维表现较好,但“看”的能力和信息换模态表达能力欠缺,且社会语言知识发展滞后,层级区间思维难以跨越。这一发现与SOLO的层次发展匹配。文章对其症因进行分析,并结合当前教学实际提出相应的教学对策,认为应加强对学生语用知识和能力的培养,重视对学生多重文本和电子文本阅读能力的培养。

基于P-TSA的车联网端边计算任务卸载策略研究

车联网场景中的车载终端不能满足计算任务对时延和能耗的要求,引入移动边缘计算(mobile edge computing,MEC)是解决上述问题的有效途径,但任务较多时依然会增加时延。针对上述问题首先提出了基于端边协同计算的车辆计算网络,该网络中的边缘计算服务器、服务车辆、任务车辆都可在本地提供计算服务;其次,构建了车联网端边协同计算系统模型,并提出计算卸载策略问题;然后,提出了一种基于融合粒子记忆的改进被囊群算法(particle memory-tunicate swarm algorithm,P-TSA),且与任务优先级和计算卸载节点预测相结合的计算卸载策略;最后,在模拟真实道路车况的任务实例下进行了对比实验,与其他卸载方案相比,所提算法显著提高了任务卸载效用,降低了卸载的时延和能耗。

基于TSA-SVM的老人跌倒识别算法

针对老人跌倒检测易受环境影响以及检测不够精确易出现误判的问题,提出了一种基于人体动作传感器的老人跌倒识别检测算法,采用被囊群算法(TSA)优化支持向量机(SVM)模型进行跌倒识别.针对人体动作传感器采集的数据,首先进行特征提取、降维等预处理,然后将预处理后的数据输入SVM模型进行训练,同时利用TSA算法寻找SVM最优参数,得到最优的跌倒识别模型,利用该模型即可进行跌倒识别.实验结果表明,本文所提算法的跌倒识别检测正确率可达96%以上,具有一定的优越性.

The Tianma 65 m radio telescope antenna

The Tianma 65 m radio telescope(TMRT)at Shanghai is a fully steerable single-dish radio telescope in China,operating at centimeter to millimeter wavelengths(1.25 GHz to 50 GHz).This paper presents details on the main specifications,design,performance analysis,testing,and construction of the telescope antenna.The measured total efficiency is better than 50%over the whole elevation angle range,first sidelobe levels are less than−20 dB,antenna system noise temperatures are less than 70 K at 30°elevation angle,and pointing accuracy is less than 3″.The measured and calculated results are in good agreement,verifying the effectiveness of the design and analysis.

基于TSA的故障隔离方法研究

基于TSA的故障隔离方法,目的是确定装备可能故障件模糊组、排故顺序及排故程序,最终提高故障定位效率。本文主要基于文献分析,提出了基于试飞保障实际需求的TSA分析流程,并在排故过程中进行应用验证,以明确基于TSA的故障隔离方法在故障隔离中的作用,对于提升排故效率和自主保障能力具有重要意义。

A Compact UHF Antenna Based on Hilbert Fractal Elements and a Serpentine Arrangement for Detecting Partial Discharg

Efforts to protect electric power systems from faults have commonly relied on the use of ultra-high frequency(UHF)antennas for detecting partial discharge(PD)as a common precursor to faults.However,the effectiveness of existing UHF antennas suffers from a number of challenges such as limited bandwidth,relatively large physical size,and low detection sensitivity.The present study addresses these issues by proposing a compact microstrip patch antenna with fixed dimensions of 100 mm×100 mm×1.6 mm.The results of computations yield an optimized antenna design consisting of 2nd-order Hilbert fractal units positioned within a four-layer serpentine arrangement with a fractal unit connection distance of 3.0 mm.Specifically,the optimized antenna design achieves a detection bandwidth for which the voltage standing wave ratio is less than 2 that is approximately 97.3%of the UHF frequency range(0.3–3 GHz).Finally,a prototype antenna is fabricated using standard printed circuit board technology,and the results of experiments demonstrate that the proposed antenna is capable of detecting PD signals at a distance of 8 m from the discharge source.

Assessment of the performance of the TOPGNSS and ANN-MB antennas for ionospheric measurements using low-cost u-blox GNSS receivers

Low-cost GNSS receivers have recently been gaining reliability as good candidates for ionospheric studies. In line with these gains are genuine concerns about improving the performance of these receivers. In this work, we present a comprehensive investigation of the performances of two antennas(the u-blox ANN-MB and the TOPGNSS TOP-106) used on a low-cost GNSS receiver known as the u-blox ZED-F9P. The two antennas were installed on two identical and co-located u-blox receivers. Data used from both receivers cover the period from January to June 2022. Results from the study indicate that the signal strengths are dominantly greater for the receiver with the TOPGNSS antenna than for the receiver with the ANN-MB antenna, implying that the TOPGNSS antenna is better than the ANN-MB antenna in terms of providing greater signal strengths. Summarily, the TOPGNSS antenna also performed better in minimizing the occurrence of cycle slips on phase TEC measurements. There are no conspicuous differences between the variances(computed as 5-min standard deviations) of phase TEC measurements for the two antennas, except for a period around May-June when the TOPGNSS gave a better performance in terms of minimizing the variances in phase TEC. Remarkably, the ANN-MB antenna gave a better performance than the TOPGNSS antenna in terms of minimizing the variances in pseudorange TEC for some satellite observations. For precise horizontal(North and East) positioning, the receiver with the TOPGNSS antenna gave better results, while the receiver with the ANN-MB antenna gave better vertical(Up) positioning. The errors for the receivers of both antennas are typically within about 5 m(the monthly mean was usually smaller than 1 m) in the horizontal direction and within about 10 m(the monthly mean was usually smaller than 4 m) in the vertical direction.

Physical design and recent experimental results of the new ICRF antenna on EAST

Two new ICRF antennas operating in the ion cyclotron radio frequency(ICRF) range have been developed for EAST to overcome the low coupling problem of the original antennas.The original ICRF antennas were limited in their power capacity due to insufficient coupling.The new antenna design takes into account both wave coupling and absorption processes through comprehensive wave coupling and absorption codes,with the dominant parallel wave number k∥of 7.5 m-1at dipole phasing.Through the use of these new ICRF antennas,we are able to achieve 3.8 MW output power and 360 s operation,respectively.The initial experimental results demonstrate the reliability of the antenna design method.

Prediction of Bandwidth of Metamaterial Antenna Using Pearson Kernel-Based Techniques

The use of metamaterial enhances the performance of a specific class of antennas known as metamaterial antennas.The radiation cost and quality factor of the antenna are influenced by the size of the antenna.Metamaterial antennas allow for the circumvention of the bandwidth restriction for small antennas.Antenna parameters have recently been predicted using machine learning algorithms in existing literature.Machine learning can take the place of the manual process of experimenting to find the ideal simulated antenna parameters.The accuracy of the prediction will be primarily dependent on the model that is used.In this paper,a novel method for forecasting the bandwidth of the metamaterial antenna is proposed,based on using the Pearson Kernel as a standard kernel.Along with these new approaches,this paper suggests a unique hypersphere-based normalization to normalize the values of the dataset attributes and a dimensionality reduction method based on the Pearson kernel to reduce the dimension.A novel algorithm for optimizing the parameters of Convolutional Neural Network(CNN)based on improved Bat Algorithm-based Optimization with Pearson Mutation(BAO-PM)is also presented in this work.The prediction results of the proposed work are better when compared to the existing models in the literature.

基于CEEMD-ITSA-BiLSTM组合模型的短期负荷预测

准确预测电力系统短期负荷有助于灵活规划系统资源、合理安排机组工作调度以及提高系统运行效率。针对负荷预测精度问题,文中提出了一种基于CEEMD-ITSA-BiLSTM(Complete Ensemble Empirical Mode Decomposition-Improved Tunicate Swarm Algorithm-Bidirectional Long Short-Term Memory)的短期负荷预测模型。对时序性负荷数据进行CEEMD分解,得到若干个平稳的IMF(Intrinsic Mode Function),并对每个IMF进行BiLSTM建模预测。为了提高BiLSTM的精度,采用ITSA算法对BiLSTM的隐含层节点数、学习率和训练次数等超参数进行参数寻优,建立CEEMD-ITSA-BiLSTM负荷预测模型。文中以实际负荷数据进行仿真实验,对比了单一BiLSTM和不同算法优化的BiLSTM模型,结果表明CEEMD-ITSA-BiLSTM模型的RMSE(Root Mean Square Error)、MAE(Mean Absolute Error)和MAPE(Mean Absolute Percentage Error)误差指标相比于BiLSTM模型分别提高了48.54%、51.32%和44.78%,显著低于其他对比模型。

Dual-band multi-beam reconfigurable terahertz antenna based on graphene frequency selective surface

In this paper,a dual-band graphene-based frequency selective surface(GFSS)is investigated and the operating mechanism of this GFSS is analyzed.By adjusting the bias voltage to control the graphene chemical po-tential between 0 eV and 0.5 eV,the GFSS can achieve four working states:dual-band passband,high-pass lowimpedance,low-pass high-impedance,and band-stop.Based on this GFSS,a hexagonal radome on a broadband omnidirectional monopole antenna is proposed,which can achieve independent 360°six-beam omnidirectional scanning at 1.08 THz and 1.58 THz dual bands.In addition,while increasing the directionality,the peak gains of the dual bands reach 7.44 dBi and 6.67 dBi,respectively.This work provides a simple method for realizing multi-band terahertz multi-beam reconfigurable antennas.

Design of a Metasurface Antenna Based on Characteristic Mode Theory

A novel metasurface antenna consisting of 5×5 rectangular patch elements is presented.Thestructure with and without the central element are both analyzed by the Characteristic Mode Theory(CMT).The developed mutually orthogonal principal modes of the optimized periodic patch structure areexcited by a center-feed dipole.A differential feeding network is employed to realize impedance matching.Prototype with profile height of 0.07λ_(0)(λ_(0)is the wavelength in free space at the lowest operatingfrequency)is fabricated and assembled to verify the simulation results.The measured results show that thereflectance coefficient of proposed matesurface antenna is less than-10 dB in the whole operating bandrange from 4.2 GHz to 5.5 GHz,a relative bandwidth of 26.8%is achieved,and the maximummeasured realized gain is more than 9 dBi with a maximum radiation efficiency of 90%.The designprovides a guideline on the application of characteristic modes(CMs)to radiation problems.

商品化的预制TSA培养基有效期确定方法的探讨

目的:通过对商品化的预制胰酪大豆胨琼脂培养基(tryptone soya agar,TSA),在2~25℃避光条件下贮存不同时间质量稳定性的考察,为该类培养基有效期的确定方法进行探讨。方法:选取2个厂家各连续3个批次商品化的预制TSA培养基,分别置2~25℃避光条件下贮存30、90和180 d,对其进行外观性状检测、pH检测、培养基适用性检查、无菌性检查。结果:2个厂家TSA培养基每批、每个贮存时间点,外观性状检测、pH检测、培养基适用性检查、无菌性检查结果均符合《中国药典》2020年版四部对培养基质量控制的要求。结论:2个厂家生产的TSA培养基在2~25℃避光条件下贮存180 d质量均符合要求,说明两个厂家生产的TSA培养基的有效期均可达到180d。

Microstrip Patch Antenna with an Inverted T-Type Notch in the Partial Ground for Breast Cancer Detections

This study designs a microstrip patch antenna with an inverted T-type notch in the partial ground to detect tumorcells inside the human breast.The size of the current antenna is small enough(18mm×21mm×1.6mm)todistribute around the breast phantom.The operating frequency has been observed from6–14GHzwith a minimumreturn loss of−61.18 dB and themaximumgain of current proposed antenna is 5.8 dBiwhich is flexiblewith respectto the size of antenna.After the distribution of eight antennas around the breast phantom,the return loss curveswere observed in the presence and absence of tumor cells inside the breast phantom,and these observations showa sharp difference between the presence and absence of tumor cells.The simulated results show that this proposedantenna is suitable for early detection of cancerous cells inside the breast.

Deployment Dynamic Modeling and Driving Schemes for a Ring-Truss Deployable Antenna

Mesh reflector antennas are widely used in space tasks owing to their light weight,high surface accuracy,and large folding ratio.They are stowed during launch and then fully deployed in orbit to form a mesh reflector that transmits signals.Smooth deployment is essential for duty services;therefore,accurate and efficient dynamic modeling and analysis of the deployment process are essential.One major challenge is depicting time-varying resistance of the cable network and capturing the cable-truss coupling behavior during the deployment process.This paper proposes a general dynamic analysis methodology for cable-truss coupling.Considering the topological diversity and geometric nonlinearity,the cable network's equilibrium equation is derived,and an explicit expression of the time-varying tension of the boundary cables,which provides the main resistance in truss deployment,is obtained.The deployment dynamic model is established,which considers the coupling effect between the soft cables and deployable truss.The effects of the antenna's driving modes and parameters on the dynamic deployment performance were investigated.A scaled prototype was manufactured,and the deployment experiment was conducted to verify the accuracy of the proposed modeling method.The proposed methodology is suitable for general cable antennas with arbitrary topologies and parameters,providing theoretical guidance for the dynamic performance evaluation of antenna driving schemes.

Effect of antenna helicity on discharge characteristics of helicon plasma under a divergent magnetic field

The characteristics of the blue core phenomenon observed in a divergent magnetic field helicon plasma are investigated using two different helical antennas, namely right-handed and lefthanded helical antennas. The mode transition, discharge image, spatial profiles of plasma density and electron temperature are diagnosed using a Langmuir probe, a Nikon D90 camera,an intensified charge-coupled device camera and an optical emission spectrometer, respectively.The results demonstrated that the blue core phenomenon appeared in the upstream region of the discharge tube at a fixed magnetic field under both helical antennas. However, it is more likely to appear in a right-handed helical antenna, in which the plasma density and ionization rate of the helicon plasma are higher. The spatial profiles of the plasma density and electron temperature are also different in both axial and radial directions for these two kinds of helical antenna. The wavelength calculated based on the dispersion relation of the bounded whistler wave is consistent with the order of magnitude of plasma length. It is proved that the helicon plasma is part of the wave mode discharge mechanism.

Array (Smart) Antennas Improve GSM Performance

As wireless data applications over cellular networks become more widespread, the pressure to increase capacity will become even more intense. Capacity in the 800 and 900 MHz bands, where bandwidth is restricted, is already becoming a limiting factor. This paper attempts to address how the application of smart antenna systems has brought about improvements in call quality and increased capacity through reduced Interference in Mobile Communication. The smart antenna may be in a variety of ways to improve the performance of a communications system. Perhaps most importantly is its capability to cancel co-channel interference. It helps in improving the system performance by increasing the channel capacity, spectrum efficiency, extending range coverage, speech quality, enabling tighter reuse of frequencies within a cellular network and economically, feasible increased signal gain, greater, reduced multipath reflection. It has been argued that Smart antennas and the Algorithms to control them are vital to a high-capacity communication system development.

3D electromagnetic simulation of the coupling characteristics and double-stub Ferrite tuners impedance matching for EAST ICRH four-strap antenna

A program developed with COMSOL software integrates EAST four-strap antenna coupling with the double-stub Ferrite tuners(FT)impedance matching,obtaining physical quantities crucial for predicting the overall performance of the ion cyclotron resonance heating(ICRH)antenna and matching system.These quantities encompass S-matrix,port complex impedance,reflection coefficients,electric field and voltage distribution,and optimal matching settings.In this study,we explore the relationship between S-matrix,reflection coefficients,port complex impedance,and frequency.Then,we analyze the impact of Faraday screens placement position and transparency,the distance from the Faraday screen(FS)to the current straps(CS),the relative distance between ports,and the characteristic impedance of the transmission line on the coupling characteristic impedance of the EAST ICRH system.Finally,we simulate the electric field distribution and voltage distribution of the EAST ICRH system for plasma heating with double-stub FT impedance matching.Using optimized parameters,the coupling power of the ICRH system can be approximately doubled.The results present herein may offer guidance for the design of high-power,long-pulse operation ICRH antenna systems.

A Multi-Token Sector Antenna Neighbor Discovery Protocol for Directional Ad Hoc Networks

In this paper,we propose a Multi-token Sector Antenna Neighbor Discovery(M-SAND)protocol to enhance the efficiency of neighbor discovery in asynchronous directional ad hoc networks.The central concept of our work involves maintaining multiple tokens across the network.To prevent mutual interference among multi-token holders,we introduce the time and space non-interference theorems.Furthermore,we propose a master-slave strategy between tokens.When the master token holder(MTH)performs the neighbor discovery,it decides which 1-hop neighbor is the next MTH and which 2-hop neighbors can be the new slave token holders(STHs).Using this approach,the MTH and multiple STHs can simultaneously discover their neighbors without causing interference with each other.Building on this foundation,we provide a comprehensive procedure for the M-SAND protocol.We also conduct theoretical analyses on the maximum number of STHs and the lower bound of multi-token generation probability.Finally,simulation results demonstrate the time efficiency of the M-SAND protocol.When compared to the QSAND protocol,which uses only one token,the total neighbor discovery time is reduced by 28% when 6beams and 112 nodes are employed.