检索结果-南通市图书馆

A comparative study on ApEn,SampEn and their fuzzy counterparts in a multiscale framework for feature extraction

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第4期11卷 270-279页

作者： Guo-liang XIONG long zhang He-sheng LIU Hui-jun ZOU Wei-zhong GUO School of Mechatronie Engineering East China Jiaotong University Nanchang 330013 China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Physics Shangrao Normal University Shangrao 334001 China

Feature extraction from vibration signals has been investigated extensively over the past decades as a key issue in machine condition monitoring and fault *** existing methods,however,assume a linear model of the underlying *** this study,the feasibility of devoting nonlinear dynamic parameters to characterizing bearing vibrations is ***,fuzzy sample entropy (FSampEn) is formulated by defining a fuzzy membership function with clear physical ***,inspired by the multiscale sample entropy (multiscale SampEn) which is originally proposed to quantify the complexity of physiological time series,we placed approximate entropy (ApEn),fuzzy approximate entropy (FApEn) and the proposed FSampEn into the same multiscale *** led to the developments of multiscale ApEn,multiscale FApEn and multiscale ***,all four multiscale entropies along with their single-scale counterparts were employed to extract discriminating features from bearing vibration signals,and their classification performance was evaluated using support vector machines (SVMs).Experimental results demonstrated that all four multiscale entropies outperformed single-scale ones,whilst multiscale FSampEn was superior to other multiscale methods,especially when analyzed signals were contaminated by heavy *** with statistical features in time domain also support the use of multiscale FSampEn.

关键词： Fault diagnosis Bearing Multiscale entropy Feature extraction Support vector machines (SVMs)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multidimensional BSDEs with Weak Monotonicity and General Growth Generators

引用

Acta Mathematica Sinica,English Series 2013年第10期29卷 1885-1906页

作者： sheng Jun FAN long JIANG School of Mathematical Sciences Fudan University College of Sciences China University of Mining and Technology

This paper aims at solving a multidimensional backward stochastic differential equation （BSDE） whose generator g satisfies a weak monotonicity condition and a general growth condition in y. We first establish an existence and uniqueness result of solutions for this kind of BSDEs by using systematically the technique of the priori estimation, the convolution approach, the iteration, the truncation and the Bihari inequality. Then, we overview some assumptions related closely to the monotonieity condition in the literature and compare them in an effective way, which yields that our existence and uniqueness result really and truly unifies the Mao condition in y and the monotonieity condition with the general growth condition in y, and it generalizes some known results. Finally, we prove a stability theorem and a comparison theorem for this kind of BSDEs, which also improves some known results.

关键词： Backward stochastic differential equation. existence and uniqueness weak monotonicitycondition general growth condition comparison theorem

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Higher-twist corrections to the D→π,K form factors from light-cone sum rules

引用

Chinese Physics C 2021年第11期45卷 72-89页

作者： long-sheng Lu Yong-Kang Huang Xuan-Heng zhang School of Physics Nankai UniversityTianjin 300071China

We calculate the D→P transition form factors within the framework of the light-cone QCD sum rules(LCSR)with the D-meson light-cone distribution amplitudes(LCDAs).The next-to-leading power(NLP)corrections to the vacuum-to-D-meson correlation function are considered,and the NLP corrections from the high-twist D-meson LCDAs and the SU(3)breaking effect from a strange quark mass are *** the exponential model of the D-meson LCDAs,the SU(3)flavor symmetry breaking effects are predicted as R+,0 SU(3)=1.12 and R T SU(3)=1.39,respectively,confirming the results obtained from LCSR with pion *** numerical predictions of the form factors show that the contribution from two-particle higher-twist contributions is of great importance and the uncertainties are dominated by the inverse moment ofϕ+D(ω,μ).With the obtained form factors,the predicted Cabibbo-Kobayashi-Maskawa(CKM)matrix elements are|Vcd|=0.151+0.091−0.043|th.+0.017−0.02|***|Vcs|=0.89+0.467−0.234|th.+0.008−0.008|exp..

关键词： light-cone sum rule semi-leptonic D decay higher-twist correction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

超声引导腰方肌阻滞对剖宫产术后镇痛的影响

引用

河北医科大学学报 2018年第9期39卷 1053-1057页

作者：张隆盛林旭林张欢楷杨铎林耿彬黄志良广东省揭阳市人民医院麻醉科广东揭阳522000

目的探讨超声引导腰方肌阻滞(quadratus lumborum block,QLB)对剖宫产术术后镇痛效果的影响。方法选择择期行足月剖宫产术产妇60例,随机分为QLB组(Q组)和对照组(C组)各30例。2组均采用腰硬联合麻醉,术后均行经静脉患者自控镇痛(patient ... 详细信息

目的探讨超声引导腰方肌阻滞(quadratus lumborum block,QLB)对剖宫产术术后镇痛效果的影响。方法选择择期行足月剖宫产术产妇60例,随机分为QLB组(Q组)和对照组(C组)各30例。2组均采用腰硬联合麻醉,术后均行经静脉患者自控镇痛(patient controlled intravenous analgesia,PCIA)。Q组于术毕行超声引导双侧QLB,每侧注射0.25%罗哌卡因30mL,C组不阻滞。记录手术时间、术中补液量、出血量及尿量。记录2组术后2,4,8,12,24,36,48h静息和运动时VAS评分;记录术后首次按压镇痛泵时间、48h内镇痛泵有效按压次数/实际按压次数比(D1/D2)和舒芬太尼用量;记录术后恢复情况;术后48h随访并记录产妇对镇痛效果的满意度和镇痛期间不良反应发生情况。结果 2组各时点静息和运动VAS评分均呈逐渐上升再下降趋势,且Q组低于C组,组间、时点间、组间·时点间交互作用差异均有统计学意义(P<0.05)。Q组术后首次按压镇痛泵时间明显延长,D1/D2明显升高,术后48h内舒芬太尼用量明显减少(P<0.05)。Q组术后首次排气时间、进食普通食物时间、下床活动时间明显缩短(P<0.05)。Q组产妇对镇痛的满意度明显升高(P<0.05)。结论剖宫产术后实施超声引导QLB镇痛效果确切,能显著缓解产妇术后疼痛,减少阿片类药物使用,促进产妇快速康复同时提高满意度。

关键词：麻醉和镇痛剖宫产术病人满意度

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ultra Dense Satellite-Enabled 6G Networks:Resource Optimization and Interference Management

引用

China Communications 2023年第10期20卷 262-275页

作者： Xiangnan Liu Haijun zhang Min sheng Wei Li Saba Al-Rubaye Keping long School of Computer&Communication Engineering University of Science and Technology BeijingBeijing 100083China Beijing Engineering and Technology Research Center for Convergence Networks and Ubiquitous Services University of Science and Technology BeijingBeijing 100083China School of Telecommunications Engineering Xidian UniversityXi’an 710071China State Radio Monitoring Center of China Beijing 100037China School of Aerospace Transport and Manufacturing Cranfield UniversityMK430ALUK

With the evolution of the sixth generation(6G)mobile communication technology,ample attention has gone to the integrated terrestrial-satellite *** paper notes that four typical application scenarios of integrated terrestrial-satellite networks are integrated into ultra dense satellite-enabled 6G networks *** the subchannel and power allocation schemes for the downlink of the ultra dense satellite-enabled 6G heterogeneous networks are *** mobile edge computing(SMEC)with edge caching in three-layer heterogeneous networks serves to reduce the link traffic of ***,a scheme for interference management is presented,involving quality-of-service(QoS)and co-tier/cross-tier interference *** simulation results show that the proposed schemes can significantly increase the total capacity of ultra dense satellite-enabled 6G heterogeneous networks.

关键词： satellite-enabled 6G networks network architecture resource optimization interference management

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于MapInfo的峰峰燃气管网地理信息系统的开发

引用

河北工程大学学报（自然科学版） 2007年第2期24卷 87-90页

作者：张胜龙侯立泉徐涛杨卫华律海波峰峰矿区煤气公司河北邯郸056200 河北工程大学城建学院河北邯郸056038

本研究以MapInfo为主要的GIS开发工具,建立了峰峰燃气管网地理信息系统。通过属性数据和空间数据的链接,实现了峰峰燃气管网的地图化表现、动态查询、基本空间分析等功能。本文从系统建设的背景、目的、总体设计、主要功能模块等几个方... 详细信息

本研究以MapInfo为主要的GIS开发工具,建立了峰峰燃气管网地理信息系统。通过属性数据和空间数据的链接,实现了峰峰燃气管网的地图化表现、动态查询、基本空间分析等功能。本文从系统建设的背景、目的、总体设计、主要功能模块等几个方面详细介绍了GIS技术在峰峰燃气管网信息系统建设中的应用。

关键词：地理信息系统(GIS) 燃气管网 MapInfo 计分析三维观察

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Lowest-energy moiré band formed by Dirac zero modes in twisted bilayer graphene

引用

Science Bulletin 2019年第8期64卷 495-498页

作者： long zhang Kavli Institute for Theoretical Sciences and CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Physical Science Laboratory Huairou National Comprehensive Science Center

The recent discovery of an unconventional insulating phase and an adjacent superconducting (SC) phase in the twisted bilayer graphene (TBG)[1,2] has triggered great excitement (3–11)The two layers of graphene are rot... 详细信息

关键词： band formed by Dirac zero modes in twisted bilayer graphene Lowest-energy moir

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mycoplasma hominis meningitis after operative neurosurgery:A case report and review of literature

引用

World Journal of Clinical Cases 2022年第3期10卷 1131-1139页

作者： Nian-long Yang Xiao Cai Qing Que Hua Zhao Kai-long zhang sheng Lv Department of Critical Care Medicine Central Hospital of PanzhihuaPanzhihua 617000Sichuan ProvinceChina School of Health and Wellness Panzhihua UniversityPanzhihua 617000Sichuan ProvinceChina

BACKGROUND Mycoplasma hominis(***),which causes central nervous system infections in adults,is very *** is also relatively difficult to culture mycoplasma and culturing requires special media,resulting in a high rate of clinical ***,clinicians often treat patients based on their own experience before obtaining pathogenic results and may ignore infections with atypical pathogens,thus delaying the diagnosis and treatment of patients and increasing the length of hospital stay and *** SUMMARY A 44-year-old man presented to the hospital complaining of recurrent dizziness for 1 year,which had worsened in the last *** admission,brain magnetic resonance imaging(MRI)revealed a 7.0 cm×6.0 cm×6.1 cm lesion at the skull base,which was irregular in shape and had a midline shift to the *** on imaging findings,meningioma was our primary *** lesion resection,the patient had persistent fever and a diagnosis of suppurative meningitis based on cerebrospinal fluid(CSF)*** patient was treated with the highest level of antibiotics(meropenem and linezolid),but the response was ***,*** was detected by next-generation metagenomic sequencing(mNGS)in the ***,we changed the antibiotics to moxifloxacin 0.4 g daily combined with doxycycline 0.1 g twice a day for 2 wk,and the patient had a normal temperature the next *** Mycoplasma meningitis after neurosurgery is *** can use mNGS to detect *** in the CSF and then provide targeted treatment.

关键词： Neurosurgery Central nervous system infections Meningitis Mycoplasma hominis Next-generation sequencing Case report

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

超声引导下射频消融治疗肝癌的疗效分析

引用

中国临床保健杂志 2010年第5期13卷 451-453页

作者：隋秀芳叶显俊刘力葛勇胜魏莉萍章生龙康冰飞安徽医科大学附属省立医院安徽省立医院超声科合肥230001

目的分析经皮射频消融(RFA)治疗肝癌的疗效。方法 33例肝癌患者的40个肿块接受了经皮肝穿射频消融治疗,行超声造影检查评估RFA的治疗效果,并随访观察其复发情况。结果射频消融治疗后,直径<3 cm的肿瘤完全消融率95%,直径≥3 cm的肿瘤完... 详细信息

目的分析经皮射频消融(RFA)治疗肝癌的疗效。方法 33例肝癌患者的40个肿块接受了经皮肝穿射频消融治疗,行超声造影检查评估RFA的治疗效果,并随访观察其复发情况。结果射频消融治疗后,直径<3 cm的肿瘤完全消融率95%,直径≥3 cm的肿瘤完全消融率79%;单个病灶的完全消融率86%,多发病灶者完全消融率75%。结论射频消融治疗肝癌的完全消融率与肿瘤的大小有关。

关键词：肝肿瘤导管消融术超声检查

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of sand sedimentation and wind erosion around sand barrier:Numerical simulation and wind tunnel test studies

引用

Journal of Mountain Science 2023年第4期20卷 962-978页

作者： zhang Kai zhang Hai-long DENG Yu-hui QU Jian-jun WANG Zheng-hui LI sheng College of Civil Engineering Lanzhou Jiaotong UniversityLanzhou730000China Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China

Based on numerical simulations,this study highlights the sedimentation and erosion problems around a sand barrier through the relationship between the shear stress of the surface around the sand barrier and the critical shear stress of sand *** numerical simulation results were verified using data measured by the wind tunnel *** results showed that when the porosity was the same,the size and position of the vortex on the leeward side of the sand barrier were related to the inlet wind *** the wind speed increased,the vortex volume increased and the positions of the separation and reattachment points moved toward the leeward *** the porosity of the sand barrier was 30%,the strength of the acceleration zone above the sand barrier was the highest,and the strength of the acceleration zone was negatively correlated with the *** erosion and sedimentation distance were related to wind *** an increase in wind speed,the sand grain forward erosion or reverse erosion areas on the leeward side of the sand barrier gradually replaced the sedimentation *** an increase in porosity,the sand sedimentation distance on the leeward side of the sand barrier gradually shortened,and the sand erosion area gradually *** sand sedimentation distance on the leeward side of the sand barrier with 30%porosity was the *** numerical simulation results were in good agreement with the wind tunnel test *** on the sand erosion and sedimentation results of the numerical simulation and wind tunnel test,when the porosity was 30%,the protection effect of the High Density Polyethylene(HDPE)board sand barrier was best.

关键词： Sand sedimentation Wind erosion Numerical simulation Wind tunnel test

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：