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锥形钻头在盲孔成型中的应用研究

印制电路信息 2024年第3期32卷 21-24页

作者：薛姣王正齐广东鼎泰高科技术股份有限公司广东东莞523000

针对高速高频电路板上的梯形盲孔加工,通过对盲孔成型方法的分析,对结构的设计进行试验验证并开展小批量测试,开发了一款锥形钻头。以盲孔形状和孔壁质量为评判准则。结果表明,开发的锥形钻头在多次研磨后依然能保持优良的孔型和高孔壁... 详细信息

针对高速高频电路板上的梯形盲孔加工,通过对盲孔成型方法的分析,对结构的设计进行试验验证并开展小批量测试,开发了一款锥形钻头。以盲孔形状和孔壁质量为评判准则。结果表明,开发的锥形钻头在多次研磨后依然能保持优良的孔型和高孔壁质量,无断针。

关键词：高速高频板锥形钻头梯形盲孔

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网络服务提供者协助犯罪侦查的规范化

福建警察学院学报 2024年第1期38卷 43-54页

作者：陈红君王郑琦西南大学法学院重庆400715 重庆市黔江区人民检察院重庆409000

数字时代,网络服务提供者协助犯罪侦查,技术性得到认可,而合法性受到质疑。立足于网络服务提供者侦查协助义务的规范来源,梳理其义务类型,发现网络服务提供者侦查协助义务的运行面临标准错位、机制空位、保障失位、监督缺位等现实掣肘... 详细信息

数字时代,网络服务提供者协助犯罪侦查,技术性得到认可,而合法性受到质疑。立足于网络服务提供者侦查协助义务的规范来源,梳理其义务类型,发现网络服务提供者侦查协助义务的运行面临标准错位、机制空位、保障失位、监督缺位等现实掣肘。因此,应通过明确协助的形式要件、推动其标准化进程,区分协助的案件范围、完善分类分级协助机制,优化协助要求的事前审批、实施协助成本的保障补偿举措,强化侦查机关内外有效监督机制、完善权益救济渠道等途径,最终实现侦查机关网络犯罪侦查工作的合法化与规范化。

关键词：网络服务提供者侦查协助义务网络犯罪侦查规范化

基于线性自抗扰控制的柔性多状态开关直流电压控制策略

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电力电容器与无功补偿 2024年第2期45卷 107-116页

作者：王正齐徐浩王德全南京工程学院电力工程学院南京211167 国网淮安供电公司变电检修室江苏淮安223200

为提高柔性多状态开关(flexible multi-state switch,FMSS)的抗干扰能力,以保证在系统干扰的情况下维持直流电压稳定,该文提出一种基于线性自抗扰控制(linear active disturbance rejection control,LADRC)的FMSS直流电压控制策略,其控... 详细信息

为提高柔性多状态开关(flexible multi-state switch,FMSS)的抗干扰能力,以保证在系统干扰的情况下维持直流电压稳定,该文提出一种基于线性自抗扰控制(linear active disturbance rejection control,LADRC)的FMSS直流电压控制策略,其控制策略可以将作用于研究对象的不确定因素整合成系统总扰动,并对扰动进行实时跟踪估计和补偿,以此抑制系统干扰。通过Matlab/Simulink对FMSS建模,并设计线性自抗扰控制器模块来替换电压外环和电流内环中的PI控制器模块。在系统干扰的情况下,对FMSS的抗干扰能力进行实验验证。仿真结果表明,与传统PI双环控制策略相比,基于LADRC的控制策略能更好地应对系统干扰,能有效提高系统干扰抑制的能力,维持FMSS直流电压稳定。

关键词：柔性多状态开关线性自抗扰控制 Matlab/Simulink 干扰抑制直流电压稳定

基于Kubernetes的多级网络软件定义网关转发系统

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计算机与数字工程 2024年第6期52卷 1802-1808页

作者：王正琦王晔郭靓刘行韦小刚南京南瑞信息通信科技有限公司南京211106

为解决边界安全网关的数据转发性能要求越来越高,运维难度逐日提升,且物理资源整体配置策略在不断动态变化的问题,提出并实现了基于Kubernetes的多级网络软件定义网关转发系统,在Kubernetes对业务集群进行集中管控的基础上,根据不同网... 详细信息

为解决边界安全网关的数据转发性能要求越来越高,运维难度逐日提升,且物理资源整体配置策略在不断动态变化的问题,提出并实现了基于Kubernetes的多级网络软件定义网关转发系统,在Kubernetes对业务集群进行集中管控的基础上,根据不同网络接口的使用场景和属性,动态调用不同类别的CNI插件进行接口配置,同时支持内核态和用户态的多级网络,将转发系统的控制平面和数据平面相分离,增强了系统服务的可控性。同时,引入了基于用户态协议栈的负载均衡模块,在不影响系统转发性能的前提下实现了数据包转发能力的动态伸缩、平滑升级、集群监视、故障迁移等功能。

关键词： Kubernetes 软件定义转发系统 CNI

PCB用中、大直径钻头缠丝原因分析及改善措施

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印制电路资讯 2024年第3期 96-98页

作者：王正齐刘绪维郑鑫广东鼎泰高科技术股份有限公司广东东莞523962

在PCB钻孔过程中普遍存在钻头缠丝的问题,本文以中、大直径钻头为研究对象,分析中、大直径钻头缠丝的产生原因及改善措施,对于PCB钻孔具有参考价值。

关键词： PCB 钻头缠丝

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新型电能通信传输检测设备

电子设计工程 2024年第3期32卷 134-138页

作者：李玉鑫王德全吴绍武王正齐南京工程学院江苏南京211167 淮安市国家电网供电公司变电检修室江苏淮安223200

目前微电网端口电能质量分析设备较少,加之非线性、不平衡等电气负荷设备的接入,电能质量的检测与分析的问题日益严重,正常情况下电压的波动与间谐波和超高次谐波等问题难以解决。该文通过在MCU的基础上加入基于FFT的分析算法以及控制模... 详细信息

目前微电网端口电能质量分析设备较少,加之非线性、不平衡等电气负荷设备的接入,电能质量的检测与分析的问题日益严重,正常情况下电压的波动与间谐波和超高次谐波等问题难以解决。该文通过在MCU的基础上加入基于FFT的分析算法以及控制模块,针对当前问题,提出了一种能够实时检测并传输谐波分量的显示装置,通过SIM900A传输模块,传输到用户侧的电能质量检测装置,方便实时对电网侧电路进行检测。可在电路中接入整流器从而减少谐波分量,实时抑制电网谐波分量的输出,保护输出电压的稳定性。

关键词：电能质量微电网信息传输高次谐波电网检测

Nematode-induced trap formation regulated by the histone H3K4 methyltransferase AoSET1 in the nematode-trapping fungus Arthrobotrys oligospora

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Science China(Life Sciences) 2023年第11期66卷 2663-2679页

作者： Qiao Miao zhengqi wang Ziyu Yin Xiaoying Liu Ran Li Ke-Qin Zhang Juan Li State Key Laboratory for Conservation and Utilization of Bio-Resources Key Laboratory for Microbial Resources of the Ministry of EducationSchool of Life SciencesYunnan UniversityKunming 650091China

The methylation of lysine 4 of histone H3(H3K4),catalyzed by the histone methyltransferase KMT2/SET1,has been functionally identified in many pathogenic fungi but remains unexplored in nematode-trapping fungi(NTFs).Here,we report a regulatory mechanism of an H3K4-specific SET1 orthologue,AoSET1,in the typical nematode-trapping fungus Arthrobotrys *** the fungus is induced by the nematode,the expression of AoSET1 is *** of AoSet1 led to the abolishment of ***,the yield of traps and conidia ofΔAoSet1 was significantly lower than that of the WT strain,and the growth rate and pathogenicity were also ***,H3K4 trimethylation was enriched mainly in the promoter of two bZip transcription factor genes(AobZip129 and AobZip350)and ultimately up-regulated the expression level of these two transcription factor *** theΔAoSet1 and AoH3K4A strains,the H3^(K4)me modification level was significantly decreased at the promoter of transcription factor genes AobZip129 and *** results suggest that AoSET1-mediated H3KEme serves as an epigenetic marker of the promoter region of the targeted transcription factor ***,we found that AobZip129 negatively regulates the formation of adhesive networks and the pathogenicity of downstream AoPABP1 and *** findings confirm that the epigenetic regulatory mechanism plays a pivotal role in regulating trap formation and pathogenesis in NTFs,and provide novel insights into the mechanisms of interaction between NTFs and nematodes.

关键词： Arthrobotrys oligospora trap formation epigenetic regulatory histone modification pathogenicity

A Rapid Determination of 30 Prohibited Pesticide Residues in Lycii Fructus by UPLC-MS/MS

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Phyton-International Journal of Experimental Botany 2023年第2期92卷 423-437页

作者： Kesheng Lin zhengqi wang Li wang Jiawen Zhou Lijuan Han Jingjing Wen Tingxia Dong Ran Duan Ning Li KMHD Shenzhen518128China Shenzhen Key Laboratory of Edible and Medicinal Bioresources HKUST Shenzhen Research InstituteShenzhen518057China Kangmei Pharmaceutical Co. Ltd.Jieyang515300China

Prohibited pesticide residues have become one of the main factors affecting the quality and safety of Lycii Fructus,However,rarely studies focus on the rapid determination of these ***,a total of 30 kinds of prohibited pesticide residues were determined by ultra-performance liquid chromatography tandem triple quadrupole mass spectrometry(UPLC-MS/MS)in five different process *** methods,chromatographic separation and detection conditions in mass spectrometry were all optimized *** the five different pretreatment methods,the first and third solid phase extraction failed to provide high recoveries of sulfosulfuron compounds(both lower than 60%).Recovery of chlorphenamidine by the Quick Easy Cheap Effective Rugged and Safe multiresidue method(QuEChERS)was lower than 60%,which did not meet the requirements of trace *** concentrations of 30 prohibited pesticides residues treated by straightforward and solid phase extraction showed good linearity in their corresponding ranges,with correlation coefficients over *** average recoveries of straightforward ranged from 78.13%to 110.9%,while RSD ranged from 1.3%to 16.9%,albeit poor purification was *** recovery yield from solid phase extraction was between 67.75%and 103.08%with RSD value from 0.8%to 14.0%,which met the requirements of trace determination,this method has good precision and *** results could be employed to other Traditional Chinese Medicines(TCMs)in detecting prohibited pesticide residues.

关键词： Lycii fructus prohibited pesticide residues UPLC-MS/MS

Friendship Inference Based on Interest Trajectory Similarity and Co-occurrence

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Chinese Journal of Electronics 2024年第3期33卷 708-720页

作者： Junfeng TIAN zhengqi HOU School of Cyber Security and Computer Hebei University Hebei Key Laboratory of High Confidence Information Systems Hebei University

Most of the current research on user friendship speculation in location-based social networks is based on the co-occurrence characteristics of users,however,statistics find that co-occurrence is not common among all users;meanwhile,most of the existing work focuses on mining more features to improve the accuracy but ignoring the time complexity in practical *** this basis,a friendship inference model named ITSIC is proposed based on the similarity of user interest tracks and joint user location *** utilizing MeanShift clustering algorithm,ITSIC clustered and filtered user check-ins and divided the dataset into interesting,abnormal,and noise *** interest trajectories were constructed from user interest check-in data,which allows ITSIC to work efficiently even for users without *** the same time,by application of clustering,the single-moment multi-interest trajectory was further proposed,which increased the richness of the meaning of the trajectory *** extensive experiments on two real online social network datasets show that ITSIC outperforms existing methods in terms of AUC score and time efficiency compared to existing methods.

关键词： Data privacy Social networking (online) Noise Clustering algorithms Prediction algorithms Inference algorithms Data models