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Statistical Characteristics Analysis of Transient Disturbances in High-power Catenary System

高电压技术 2013年第10期39卷 2465-2470页

作者： YANG Zhichao SHAN Qin WU Peng zhao mingmin High Voltage Department China Electric Power Research Institute Beijing 100192 China China Academy of Electronics and Information Technology Beijing 100041 China Signaling & Communications Research Institute China Academy of Railway Sciences Beijing 100081 China

Communication and signaling systems on board can be affected by the transient electromagnetic (EM) disturbances induced by a contact sliding between the catenary and the pantograph. In order to verify the immunity of the embedded communication and signaling systems working in these transient EM disturbances environments, the time and amplitude parameters of the transient disturbances on board are characterized. Measurements are performed on a board of the China railways high-speed (CRH) trains to collect a large amount of radiated and conducted transient EM disturbance information both on the train roof and in the radio frequency (RF) cable. With the ultimate goal of generating transient disturbances scenarios, which are representative of those detected by the antennas and the probe, and performing immunity tests in laboratory conditions, statistical distributions of the transient characteristics of the transients, such as rise time(/r), time duration(/d), time interval^,), and peak amplitude^), are studied. As for radiated transient disturbances, several statistical parameters are obtained from probability density functions (PDFs), which were simulated by MTLAB using the probability density and the estimation methods. Test results are estimated by using the maximum likelihood estimation method with 95% confidence intervals (except time interval). In the conducted transient disturbances tests, both tT (common value of 25-27 ns) and /d (0.1-0.4 |is) are greater than that in EN 61000-4-4 while t, (45 -55 us) is far less than that in EN61000-4-4.

关键词：接触网系统瞬态干扰统计特性分析最大似然估计法大功率概率密度函数电磁干扰上升时间

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文化视域下中国共产党自我革命精神的生成逻辑

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濮阳职业技术学院学报 2024年第2期37卷 80-84页

作者：陈哲赵明敏武汉理工大学马克思主义学院湖北武汉430070

中国共产党在发展党和国家事业过程中生成的自我革命精神,成为激励中国共产党人始终奋勇前进的强大精神力量,它的形成蕴含了深刻的文化逻辑。从逻辑起点看,马克思主义和中华优秀传统文化是其形成的文化基因;从逻辑中介看,物质文化、行... 详细信息

中国共产党在发展党和国家事业过程中生成的自我革命精神,成为激励中国共产党人始终奋勇前进的强大精神力量,它的形成蕴含了深刻的文化逻辑。从逻辑起点看,马克思主义和中华优秀传统文化是其形成的文化基因;从逻辑中介看,物质文化、行为文化、制度文化推动了其形成;从逻辑旨归看,文化特质是其形成的显著标志。从文化的角度剖析中国共产党自我革命精神的生成逻辑,有利于将其内化为中国共产党人的行动自觉。

关键词：文化中国共产党自我革命精神生成逻辑

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Deep Learning Aided SCL Decoding of Polar Codes with Shifted-Pruning

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China Communications 2023年第1期20卷 153-170页

作者： Yang Lu mingmin zhao Ming Lei Chan Wang Minjian zhao College of Information Science and Electronic Engineering Zhejiang UniversityHangzhou 310027China Zhejiang Provincial Key Laboratory of Information Processing Communication and Networking(IPCAN)Hangzhou 310027China

Recently,a generalized successive cancellation list(SCL)decoder implemented with shiftedpruning(SP)scheme,namely the SCL-SP-ωdecoder,is presented for polar codes,which is able to shift the pruning window at mostωtimes during each SCL re-decoding attempt to prevent the correct path from being eliminated.The candidate positions for applying the SP scheme are selected by a shifting metric based on the probability that the elimination occurs.However,the number of exponential/logarithm operations involved in the SCL-SP-ωdecoder grows linearly with the number of information bits and list size,which leads to high computational complexity.In this paper,we present a detailed analysis of the SCL-SP-ωdecoder in terms of the decoding performance and complexity,which unveils that the choice of the shifting metric is essential for improving the decoding performance and reducing the re-decoding attempts simultaneously.Then,we introduce a simplified metric derived from the path metric(PM)domain,and a custom-tailored deep learning(DL)network is further designed to enhance the efficiency of the proposed simplified metric.The proposed metrics are both free of transcendental functions and hence,are more hardware-friendly than the existing metrics.Simulation results show that the proposed DL-aided metric provides the best error correction performance as comparison with the state of the art.

关键词： polar codes successive cancellation list decoding deep learning shifted-pruning path metric

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基于可移动单元的智能反射面辅助近场定位技术

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移动通信 2024年第4期48卷 41-46+53页

作者：李斌亮赵明敏雷鸣刘安李旻浙江大学

RIS在提高感知系统可靠性方面具有广泛的应用前景。同时，可移动天线技术可以利用天线的局部运动，动态地改变发射机和/或接收机处的天线位置，以优化信道条件，提高通信性能。因此，将可移动天线技术引入RIS，通过充分利用无线信道在... 详细信息

RIS在提高感知系统可靠性方面具有广泛的应用前景。同时，可移动天线技术可以利用天线的局部运动，动态地改变发射机和/或接收机处的天线位置，以优化信道条件，提高通信性能。因此，将可移动天线技术引入RIS，通过充分利用无线信道在有限区域的空间变化，进一步实现智能可控的无线信道传播环境。基于此，研究了一种基于可移动单元的智能反射面辅助近场定位技术。首先，提出了基于近场模型的最大似然定位算法，并推演出衡量定位性能的CRLB。然后，提出了一种基于投影梯度下降的交替优化算法，实现智能反射单元动态位置和波束赋形的联合优化，以获得RIS用于定位的优化结构和相位配置。仿真结果表明，与传统固定单元的RIS相比，通过灵活调整RIS反射单元的拓扑结构，获得更好的信道条件，能够显著降低用户位置估计的CRLB，提高系统的定位性能。

关键词：可移动单元的智能反射面近场定位克拉美罗下界投影梯度下降波束赋形

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EPEG型聚羧酸保坍剂的制备及性能研究

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四川建材 2024年第6期50卷 13-15页

作者：汪咏梅赵明敏倪涛宋欣 Serina Ng 石家庄市长安育才建材有限公司河北石家庄051430 河北省混凝土用功能性材料工程技术研究中心河北石家庄051430

以乙二醇单乙烯基聚乙二醇醚(EPEG)、丙烯酸羟丙酯(HPA)、丙烯酸(AA)为主要原料,在常温条件下通过自由基聚合合成聚羧酸保坍剂。通过试验考察了釜底浓度、反应温度、引发剂、链转移剂用量及酸醚比对产品性能的影响。最佳反应条件:HPA∶A... 详细信息

以乙二醇单乙烯基聚乙二醇醚(EPEG)、丙烯酸羟丙酯(HPA)、丙烯酸(AA)为主要原料,在常温条件下通过自由基聚合合成聚羧酸保坍剂。通过试验考察了釜底浓度、反应温度、引发剂、链转移剂用量及酸醚比对产品性能的影响。最佳反应条件:HPA∶AA∶EPEG=3.5∶1.5∶1.0,引发剂占单体质量百分比为1.2%,滴加时间为60 min,保温30 min,反应结束。通过对EPEG和TPEG大单体核磁对比分析,以及EPGE与TPEG型保坍剂进行凝胶渗透色谱(GPC)、总有机碳分析仪(TOC)微观分析,证实了EPEG型保坍剂具有更优性能的微观原因。在达到相同保坍性能条件下,EPEG型保坍剂只占TPEG型保坍剂用量的80%,大幅降低了保坍剂用量,显著节约成本,大幅提高市场竞争力,同时EPEG型保坍剂常温、短时间、高效率的生产特点,使其具有良好的经济价值及广泛的应用前景。

关键词： EPEG 保坍剂常温合成微观分析保坍性能

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番茄种质几种病害抗性基因的分子标记检测

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分子植物育种 2024年第14期22卷 4590-4609页

作者：王海娟魏瑶刘燕郑于莉郭志慧岳建英尚春明赵明敏内蒙古农业大学园艺与植物保护学院呼和浩特010011 内蒙古包头市农牧业科学研究院包头014013 乌兰察布市兴和县鄂尔栋镇综合保障和技术推广中心乌兰察布012000

番茄病害在番茄生产中危害非常严重,可导致番茄产量和品质的大幅度降低。目前,抗病番茄种质资源较少。因此,本研究拟对不同番茄的种质材料进行番茄根腐病、番茄斑萎病和番茄黄化曲叶病毒病的抗性基因进行分子标记检测。根据已报道的抗... 详细信息

番茄病害在番茄生产中危害非常严重,可导致番茄产量和品质的大幅度降低。目前,抗病番茄种质资源较少。因此,本研究拟对不同番茄的种质材料进行番茄根腐病、番茄斑萎病和番茄黄化曲叶病毒病的抗性基因进行分子标记检测。根据已报道的抗性基因的分子标记引物,对番茄种质材料进行PCR扩增,获得抗性基因的特异性片段,在抗根腐病的分子标记中筛选出83份番茄种质为纯合体抗病体;在抗斑萎病的分子标记中筛选出4份番茄种质为纯合体抗病体;在抗番茄黄化曲叶病毒病分子标记中,筛选出39份番茄种质纯合抗病体。研究结果可为番茄抗病育种的快速鉴定提供理论依据。

关键词：番茄病害抗性基因分子标记

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The Reversible Methylation of m6A is Involved in Plant Virus Infection

The Reversible Methylation of m6A is Involved in Plant Virus...

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中国植物病理学会2023年学术年会

作者： YUE Jianying WEI Yao SUN Zhenqi CHEN Yahan WANG Haijuan GUO Yuqing Fabio Pasin zhao mingmin College of Plant Protection Gansu Agricultural University

N6-methyladenosine(m6 A) is the most prevalent modification in the mRNAs of many eukaryotie species.The abundance and effects of m6 A are determined by dynamic interactions between its methyltransferases, demethylases, and binding proteins.Proteins of the alkylation B( AlkB)superfamily show RNA demethylase activity removing methyl adducts from N6-methyladenosine.Methyltransf erase(MTase) enzymes catalyze the addition of a methyl group to a variety of biological substrates.Methylated RNA immunoprecipitation sequencing of virus-infected samples showed that m6 A peaks are enriched in plant transcript 3 ’ UTR and in discrete internal and 3’ terminal regions of PPV and PVY genomes.In addition, We find that m6 A levels in Nicotiana benthamiana( A’.benthamiana) are reduced by infection of plum pox virus and potato virus Y.Down-regulation of A’, benthamiana AlkB homologues of the plant-specif ic ALKBH9 clade caused a significant decrease in PPV and PVY accumulation.Overexpression of NbMETTLl and NbMETTL2 caused a decrease of plum pox virus accumulation.The results suggest a general involvement of RNA methylation in potyvirus infection.The life cycles of plant RNA viruses are often coordinated with the mechanisms of their RNA modification.It appears that m6 A methylation plays a dual role during viral infection in plants.On the one hand, m6 A methylation acts as an antiviral immune response induced by virus infection, which inhibits viral replication or translation through the methylation of viral genome RNAs.On the other hand, plant viruses could disrupt the m6 A methylation through interacting with the key proteins of the m6 A pathway to avoid modification.Based on this mechanism, we propose that new strategies for plant virus control could be designed with competitive antagonists of m6 A-associated proteins.

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Inhibition Effect and Synergistic Effect of Prochloraz and Tebuconazole and Their Mixture on Fusarium graminearum

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Plant Diseases and Pests 2017年第6期8卷 28-30页

作者： Zhang Xing Zhang Lin He Yiqin Lu Chen Fang Zhengwu zhao mingmin Zhu Yongxing Ma Dongfang Hubei Collaborative Innovation Center of Main Grain Crop Industrialization/Collage of Agriculture Yangtze University Hubei Provincial Bureau of Agricultural Reclamation Management

Wheat scab caused by Fusarium graminearum is increasingly severe in the middle and lower reaches of the Yangtze River region. With long-term use of single chemical pesticide,the drug resistance of F. graminearum is growing day by day. In order to reveal the inhibition effect and synergistic effect of prochloraz and tebuconazole and their mixture on F. graminearum,new compound agents for controlling wheat scab were developed. The inhibition effect and synergistic effect of prochloraz and tebuconazole mixed at seven different ratios on F. graminearum were studied. The results showed that the efficiency of the mixture was the best when the proportion of prochloraz and tebuconazole was 1:7; the EC50 was 0.145 36 and the synergistic coefficient was 1.853 9. The results provide a theoretical basis for development of new compound agents and effective control of wheat scab.

关键词： Fusarium graminearum Prochloraz Tebuconazole Compound agent Sensitivity

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Meeting the challenges of invasive alien species

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National Science Review 2024年第3期11卷 296-298页

作者： Weijie zhao NSR news

The Xinjiang Uygur Autonomous Region of China is famous for its tomato production. Abundant sunshine, large day–night temperature difference and the abundant irrigation by snowmelt from the Tianshan Mountains produce...

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Ling-Ling Chen: RNA has its own features;don't study it as a protein

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National Science Review 2024年第2期11卷 301-305页

作者： Weijie zhao NSR

Non-coding RNA(ncRNA) has been a very active research area over the past 30 years. From small nc RNA – the discovery of RNA interference won the lead researchers the Nobel Prize, to long ncRNA(lncRNA), which has attracted much attention in recent years, various nc RNAs participate in all kinds of biological processes and show a variety of biomedical application prospects.

关键词： RNA

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