Turbo Message Passing Based Burst Interference Cancellation for Data Detection in Massive MIMO-OFDM Systems

This paper investigates the fundamental data detection problem with burst interference in massive multiple-input multiple-output orthogonal frequency division multiplexing(MIMO-OFDM) systems. In particular, burst interference may occur only on data symbols but not on pilot symbols, which means that interference information cannot be premeasured. To cancel the burst interference, we first revisit the uplink multi-user system and develop a matrixform system model, where the covariance pattern and the low-rank property of the interference matrix is discussed. Then, we propose a turbo message passing based burst interference cancellation(TMP-BIC) algorithm to solve the data detection problem, where the constellation information of target data is fully exploited to refine its estimate. Furthermore, in the TMP-BIC algorithm, we design one module to cope with the interference matrix by exploiting its lowrank property. Numerical results demonstrate that the proposed algorithm can effectively mitigate the adverse effects of burst interference and approach the interference-free bound.

汽车及零部件电磁兼容测试方法基于ECE R10的变化解析

汽车电子电磁兼容性不仅是评价汽车及零部件的重要性能指标之一,也是汽车及零部件出口国外市场必要的测试之一,车企出口欧盟需要满足《关于车辆电磁兼容性能认证的统一规定》(ECE R10)要求并遵照法规要求进行电磁兼容测试。本文对比了新旧版本ECE R10对于测试方法与要求的变化,为开展汽车电子产品的电磁兼容检测和认证提供参考。

基于频率匹配的EC模式定量降水偏差订正

为了提升模式预报效果,文章利用四川盆地南部2018-2020年5-9月的EC模式降水预报资料和实况降水资料,采用频率匹配的方法对EC模式的24 h累计降水进行订正分析和检验,给出了预报偏差订正系数。研究结果能够提升相关区域的降水预报能力。

EC130温拌剂对SBS改性沥青高温性能及抗疲劳性能的影响

作为制备沸石发泡沥青的发泡剂,EC130温拌剂释放的发泡水和残留的沸石矿物对沥青的性能有着不同的影响.为研究EC130温拌剂对SBS改性沥青高温性能和抗疲劳性能的影响,采用石灰岩矿粉、EC130沸石矿物和EC130温拌剂等3种添加物,设计了以添加物掺量为变量的单因素试验.以石灰岩矿粉为参照对象,通过温度扫描试验、多重应力蠕变恢复试验和线性振幅扫描试验,分析了EC130沸石矿物和EC130温拌剂释放的发泡水对SBS改性沥青高温性能和抗疲劳性能的影响.结果表明:同石灰岩矿粉一样,沸石发泡沥青中的EC130沸石矿物使沥青弹性增大、黏性减小,有利于抗车辙性能的提升,但不利于抗疲劳性能;沸石发泡沥青中的发泡水使其黏性增大、弹性减小,有利于抗疲劳性能的提升,但不利于抗车辙性能.

Standardization of apple cancellation test for neglect patients in Korea:An observational study

BACKGROUND Neglect can be divided into two types using apple cancellation test(apple test):Egocentric neglect(EN)and allocentric neglect(AN).However,in South Korea,apple test results and decision criteria are still largely dependent on tests by foreign countries.AIM To establish a new South Korea standard and improve the accuracy of neglect assessment,the apple experiment was standardized in this study.METHODS This study was conducted on 223 healthy subjects for a total of 7 mo from August 2021 to February 2022.Standardization was carried out using the original apple test developed by Bickerton in 2011.In scoring for the apple test,total omission error refers to the number of missed targets(full apple)in the entire test sheet(left,middle,and right area).The score for EN is the difference between the correct number of right area and the correct number of left area(excluding the middle area).For AN,the score is difference between the number of left opening apples and number of right opening apples(including the middle area).Linear regression analysis was used for standardization using the general characteristics of subjects and the results of the apple test.RESULTS The cut-off score,which is the standard value indicating the pathological condition by combining the results of all subjects,is as follows:Total omission error(5),error for EN(2),and error for AN(2).Also,differences in cut-off score according to age were found.CONCLUSION This study will be helpful in facilitating a more accurate differential diagnosis of neglect.

气溶胶中OC和EC分离方法研究

碳质气溶胶的来源解析及其环境行为研究可以为我国的“减碳”及相关法规的制定提供必要的科学依据,是目前全球气候变化和大气环境科学研究的前沿和热点之一。本文通过氚碳氧化燃烧炉实现气溶胶样品中OC和EC的分离,建立最佳的升温程序,研究基于氚碳氧化燃烧炉的气溶胶中OC和EC分离方法。

不同营养液EC值对叶用莴苣生长及营养品质的影响

为明确营养液EC值对不同叶用莴苣品种生长和营养品质的影响,本研究采用单因素试验设计,设置3个不同营养液EC值(1.6、2.0、2.4 mS/cm),培养2种叶用莴苣,并测定其植株的农艺性状、光合指标及营养品质。结果表明:不同叶用莴苣品种对营养液EC值相应不同,当营养液EC值为1.6 mS/cm时,有利于紫霞品种的生长,表现为冠幅较大、最大叶宽较宽、光合指标较高、干物质及维生素C含量较高;当营养液EC值为2.0 mS/cm时,则有利于玛丽娜品种的生长,但营养指标较低。说明,不同叶用莴苣品种的农艺性状、光合指标及营养品质对营养液EC值反应差异较大。在叶用莴苣种植过程中,应根据叶用莴苣品种、生育期等适当调节营养液EC值,避免盲目提高营养液EC值,造成不必要的浪费。

基于儿童安全座椅的德国ADAC测试与ECE R129法规差异性研究

本文解析了德国ADAC测试与ECER129法规的主要差异,梳理了德国ADAC测试方法及评分规则,结合ECER129法规内容介绍了德国ADAC测试的主要项目,并进行了德国ADAC碰撞测试比对,期望帮助我国儿童安全座椅企业在产品设计时结合法规差异性,以在满足ECE R129法规的基础上取得更好的ADAC测试评分。

基于VMD-ORELM-EC的超短期风速组合预测模型

为提高超短期风速预测的精度,文章提出一种基于变分模态分解(variational mode decomposition,VMD)、离群鲁棒极限学习机(outlier-robust extreme learning machine,ORELM)和误差修正(error correction,EC)的超短期风速组合预测模型VMD-ORELM-EC。首先利用VMD将原始风速序列分解,并对每个分解子序列分别建立ORELM模型,将各子模型预测结果相加得到模型初步预测序列;然后将原始风速序列与初步预测序列相减得到模型的误差序列,并对误差序列进行VMD分解,对分解得到的误差子序列建立ORELM模型,从而得到误差预测序列;最后将模型的初步预测序列与误差预测序列组合得到最终的风速预测序列。利用该文提出的预测模型对北京测风塔实测的风速数据进行分析,结果表明模型可以有效挖掘风速序列特性,在超短期风速预测上具有较高的预测性能。

MXene-based hybrid materials for electrochemical and photoelectrochemical H_(2) generation

The conversion of solar energy to produce clean hydrogen fuel through water splitting is an emerging strategy for efficiently storing solar energy in the form of solar fuel.This aligns with the increasing global demand for the development of an ideal energy alternative to fossil fuels that does not emit greenhouse gases.Electrochemical(EC) and photoelectrochemical(PEC) water splitting technologies have garnered significant attention worldwide for advanced hydrogen solar fuel production in recent decades.To achieve sustainable green H_(2) production,it is essential to create efficient catalyst materials that are low-cost and can replace expensive noble metal-based catalysts.These characteristics make them an ideal catalyst material for the process.Two-dimensional MXenes with M_(n+1)X_(n) structure have been identified as a promising option for EC and PEC water splitting due to their superior hydrophilicity,metal-like conductivity,large surface area,and adjustable surface chemistry.Here,we present a summary of recent advancements in the synthesis and performance enhancement methods for MXene hybrid materials in hydrogen production through EC and PEC water splitting.Furthermore,we examine the challenges and insights associated with the rational design of MXene-based hybrid materials to facilitate efficient water splitting for sustainable solar fuel production.

Off-Grid Compressed Channel Estimation with Parallel Interference Cancellation for Millimeter Wave Massive MIMO

Millimeter wave(mmWave)massive multiple-input multiple-output(MIMO)plays an important role in the fifth-generation(5G)mobile communications and beyond wireless communication systems owing to its potential of high capacity.However,channel estimation has become very challenging due to the use of massive MIMO antenna array.Fortunately,the mmWave channel has strong sparsity in the spatial angle domain,and the compressed sensing technology can be used to convert the original channel matrix into the sparse matrix of discrete angle grid.Thus the high-dimensional channel matrix estimation is transformed into a sparse recovery problem with greatly reduced computational complexity.However,the path angle in the actual scene appears randomly and is unlikely to be completely located on the quantization angle grid,thus leading to the problem of power leakage.Moreover,multiple paths with the random distribution of angles will bring about serious interpath interference and further deteriorate the performance of channel estimation.To address these off-grid issues,we propose a parallel interference cancellation assisted multi-grid matching pursuit(PIC-MGMP)algorithm in this paper.The proposed algorithm consists of three stages,including coarse estimation,refined estimation,and inter-path cyclic iterative inter-ference cancellation.More specifically,the angular resolution can be improved by locally refining the grid to reduce power leakage,while the inter-path interference is eliminated by parallel interference cancellation(PIC),and the two together improve the estimation accuracy.Simulation results show that compared with the traditional orthogonal matching pursuit(OMP)algorithm,the normalized mean square error(NMSE)of the proposed algorithm decreases by over 14dB in the case of 2 paths.

A low-profile metamaterial absorber with ultrawideband reflectionless and wide-angular stability

An ultrawideband reflectionless metamaterial absorber(MA)is proposed by replacing the metallic ground with the complementary split-ring resonator(CSRR)structure.The proposed MA exhibits-10 d B reflectivity spectrum from 1 GHz to 20 GHz,which maintains more than 90%absorption from 1.5 GHz to20 GHz.Furthermore,it achieves angle stability for TE and TM polarization at oblique incident angles up to 40°and 65°,respectively.To achieve broadband absorption spectrum,we have adopted a single-layer high-impedance surface(HIS)loaded with a double-layer magnetic material(MM)structure.To further realize the RCS reduction into a lower frequency range,we have employed the scattering cancellation technology into the traditional metallic ground.Finally,we have fabricated a sample exhibiting the 10 d B RCS reduction from 1 GHz to 20 GHz with a thickness of 10 mm.Measurement and simulation results confirm that the proposed MA exhibits excellent comprehensive performance,making it suitable for many practical applications.

Active Cancelation of Acoustic Noise in Waveguides by Standard Control Task Decision Usage

Cybernetic decision variants were analyzed in order to use for physical task of active noise cancelation. 10 dB mean active noise cancellation is demonstrated in two decades frequency band by usage of cybernetic decision for acoustical duct physical scale model. The used decision was found on minimization of acoustical field power transfer function from the beginning of waveguide to their end.

山东玻纤年产17万吨ECER数字化升级技改项目开工

2月26日,山东玻纤17万吨ECER玻纤生产线数字化升级技改项目奠基开工。据介绍,该项目在原生产线的基础上利用原有厂房、公用站房、设备设施降低投资、合理规划进行数字化、智能化技改建设。项目建成后能够实现智能配料、智能运输、智能仓储以及柔性生产,具备随时调整产品结构能力。人均工效较以往提高3倍,有力推动山东玻纤产品结构调整和产业布局优化。

夏季环境下不同营养液EC值及光照强度对观赏竹芋生长的影响初探

为筛选出在夏季高温环境、温室生产条件下,抗性较好的观赏竹芋品种,以10个观赏竹芋品种为试验材料,研究了不同营养液EC值与不同光照强度对观赏竹芋生长的影响。结果表明:在营养液EC值为1.2~1.4 mS/cm并且降低光照强度时,大部分观赏竹芋的株高、冠幅较大,叶片焦尖、焦边、黄叶、黄斑等不良症状出现较少。根据供试观赏竹芋品种在夏季高温逆境下的生长指标和叶片表现进行综合判断,可将10个竹芋品种划分为耐热、比较耐热、不耐热3个等级,其中‘魅力之星’‘老飞羽’‘孔雀’‘猫眼’4个品种在夏季高温环境、温室生产条件下,表现出较好的抗性。

基于不同肥水EC值的竹芋生长发育研究

为探究肥水EC值对竹芋生长发育的影响,确定最优肥水EC值,以竹芋为研究对象,通过交叉实验分析竹芋株高、冠幅和叶片数量对不同肥水EC值的响应,并确定了最佳肥水EC值,同时分析了达到最佳肥水EC值前与竹芋株高和冠幅之间的关系。结果表明,株高和冠幅均受肥水EC值的显著影响,而叶片数量则未见显著差异;经聚类分析,将不同肥水EC值划分为4类,其中,肥水EC值1.2 m S/cm为最佳肥水EC值,达到最佳肥水EC值前,竹芋的株高和冠幅均随肥水EC值的增加而增加,二者间呈线性正相关。

中国工程建设标准化协会标准《智能化碳纤雨水收集模块系统技术规程》T/CECS 1272-2023的勘误

中国工程建设标准化协会标准《智能化碳纤雨水收集模块系统技术规程》T/CECS 1272-2023中“表3.2.2碳纤雨水收集模块芯材技术参数表”更正如下。

基于ECS的内河船舶引航操作适任实操评估方法研究

重庆内河船员适任评估示范中心建成以后,内河船员实操考试将由现有的实船评估向模拟器评估逐步转变。通过分析重庆海事局当前内河船员实操考试的现状及存在的问题,结合现实问题,提出了利用电子海图系统(ECS)开展内河船舶引航操作项目实操评估的可行性方案。

端粒酶抑制因子X1过表达对人食管癌EC1细胞增殖及凋亡的影响

目的探究端粒酶抑制因子X1(PinX1)对人食管癌EC1细胞增殖及凋亡的影响。方法体外培养人食管癌细胞系EC1细胞株,并将其分为空白对照(NG)组(空白对照细胞)、pcDNA组(转染阴性对照质粒)、pcDNA-PinX1组(转染PinX1过表达质粒)、N-乙酰-L-半胱氨酸(NAC)组(加入信号通路抑制剂)。采用实时荧光定量PCR法检测各组PinX1 mRNA的表达水平。分别采用CCK-8法和流式细胞术检测各组细胞的增殖、凋亡情况。采用荧光探针法检测各组活性氧簇(ROS)水平。采用蛋白质印迹法检测各组腺苷酸激活蛋白激酶/信号转导与转录激活因子3(AMPK/STAT3)信号通路相关蛋白的表达水平。结果经成功转染细胞后,与NG组、pcDNA组比较,pcDNA-PinX1组细胞的增殖抑制率、凋亡率、ROS水平、p-AMPK/AMPK均升高,而p-STAT3/STAT3均降低,差异均有统计学意义(P均<0.05)。与pcDNA-PinX1组比较,NAC组细胞的增殖抑制率、凋亡率、ROS水平、p-AMPK/AMPK均降低,p-STAT3/STAT3升高,差异均有统计学意义(P均<0.05)。结论PinX1过表达可抑制人食管癌EC1细胞增殖并诱导其凋亡,可能通过促进ROS/AMPK/STAT3信号通路活化来实现。

CAFs条件培养基影响EC9706细胞能量代谢的分子机制探索

目的通过收集癌相关成纤维细胞(CAFs)的条件培养基,探索CAFs促进EC9706细胞能量代谢的分子机制。方法通过MTT检测细胞活性,以DMEM高糖培养基培养的EC9706作为对照,筛选最适合间接共培养的CAFs条件培养基(CAFM);比色法检测EC9706细胞上清中乳酸及葡萄糖含量;Seahorse系统能量代谢分析系统检测EC9706细胞在DMEM与CAFM中能量代谢情况;实时荧光定量聚合酶链式反应(Real time quantitative PCR,RT-qPCR)、蛋白免疫印迹法(Western blot)检测能量代谢相关分子mRNA及蛋白的表达。结果细胞融合度为50%-60%、70%-80%的CAFs条件培养基(CAFM)组与正常食管成纤维细胞条件培养基(NFM)相比,均有促进EC9706细胞增殖的作用(P<0.01),且在细胞融合度达70%-80%的CAFM各组中,与对照组相比,CAFM含量为60%时,对EC9706细胞的增殖作用显著升高(P<0.01)。与DMEM相比,CAFM可以上调EC9706细胞葡萄糖摄取、上清乳酸含量、基础呼吸值、基础糖酵解、补偿糖酵解(P<0.05),非线粒体耗氧、最大呼吸值、合成ATP耗氧量、备用呼吸能力(P<0.01)。RT-qPCR结果显示,CAFM还可上调EC9706细胞的低氧诱导因子-1α(HIF-1α)、己糖激酶2(HK2)、单羧酸转运蛋白1(MCT1)(P<0.05),葡萄糖转运蛋白1(GLUT1)、丙酮酸激酶2(PKM2)(P<0.01)mRNA的表达。蛋白免疫印迹法结果显示,与DMEM相比,HK2、PKM2、MCT1、GLUT1的蛋白表达均显著提高(P<0.01)。结论CAFM能够通过促进EC9706细胞HK2、PKM2、HK2、GLUT1、MCT1、MCT4的mRNA和蛋白的表达,促进EC9706细胞的能量代谢。