检索结果-南通市图书馆

Resistivity tomography based on multichannel electrodes

Applied Geophysics 2024年第4期21卷 639-649,878页

作者： Jiang Fu-yu Ni Jiong Chen Hai-jun Gao Li-kun Chen Song Wu Xian-wei su zhi-qiang Lei Yao Dai Ming-hui Han Run and Yu Jun-kai School of Earth Science and Engineering Hohai UniversityNanjing 211100 Nanjing hydraulic research Hydraulic Research Institute National Energy AdministrationMinistry of TransportMinistry of Water ResourcesNanjing 210029 First Geological Brigade of Jiangsu Bureau of Geology and Mineral Resources Nanjing 210041

With the constantly changing engineering construction sector,the detection accuracy of conventional electrical resistivity tomography(ERT)is no longer suffi cient.A multichannel electrode design(MERT)-based ERT is introduced in this paper to address the growing need for *** imaging accuracy of the ERT method is improved through the collection of apparent resistivity data in various directions by measuring the potential diff erence between diff erent *** simulation results of the inclined high-resistivity anomaly model reveal that MERT is a precise representation of the shape,inclined direction,and buried depth of the anomaly,with thoroughfare M2N2 producing the most precise forward and inverse *** on the analysis results of the model resolution matrix,when the buried depth of power supply points and the gap between potential acquisition points are 30%-90%and 30%-60%of the electrode distance,respectively,the MERT approach yields superior detection *** detection eff ect of the MERT method on anomalous bodies with diff erent burial depths under the optimal parameters also indicates that the MERT method can obtain richer potential change information with higher resolution in deep areas compared to the ERT *** the implementation of the MERT approach,the scope of applications for ERT is expanded,the accuracy of ERT detection is increased,and the progress of near-surface fi ne detection is positively infl uenced.

关键词： Multichannel electrode Resistivity tomography Model resolution CR method Numerical simulation.

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

Fire needle up-regulates the expression of ERK1/2 in neural stem cells

引用

Traditional Medicine Research 2017年第3期2卷 149-154页

作者： Jia-Chun Xu zhi-Heng Zhao su-Li Cheng Xue Wang Zhao-Hua Jiao zhi-Min Cai Zhen Zhou Bao-HongLiu Yan Li Tianjin University of Traditional Medicine Research TianjinChina Tianjin Gongan Hospital TianjinChina HebeiNormal University of Science&Technology HebeiChina The2nd Affiliated Hospital of Tianjin University of TCM TianjinChina

Objective:To explore the effect of fire needle on the expression of ERK1/2 of neural stem cells(NSCs)obtained from rats with spinal cord injury(SCI).Methods:Sixty SD female rats were randomly divided into 5 groups,including 5 in the blank group,5 in the sham operation group,25 in the model group,and 25 in the fire needle treated *** in the model group and the fire needle treated group were further divided into the 1d group,the 3d group,the 7d group,the 10d group and the 14d group,*** Allen's method was applied to build SCI model,and serum in the abdominal aorta was collected at the indicated time and placed into NSCs culture dishes for ***-PCR was applied to detect the expression of ERK1/***:According to the Basso,Beattie&Bresnahan scale(BBB scale),rats in the model group and the fire needle treated group scored 0 at first day,suggesting a success of modeling after *** scores of the fire needle group were significantly higher than those in the model group(P<0.05).Compared with sham operation group,the expression of ERK1 and ERK 2 in model group and fire needle group were significantly decreased at day 1(P<0.05),and lasted for 3d(P<0.05).At day 7 and day 10,the expressions of ERK1 and ERK2 in the fire needle group were significantly higher than those in the model group(both P<0.05).Conclusion:Fire needle could up-regulate the expression of ERK1 and ERK2 of NSCs from SCI rats.

关键词： Fire needle Spinal cord injury ERK Neural stem cells

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

工程在线监控及反馈分析系统综合推理库

引用

长江科学院院报 2001年第3期18卷 32-35页

作者：苏怀智吴中如温志萍张彪河海大学水电学院江苏南京210098 南京工程学院江苏南京210013 福建省水口水电站福建闽清350800

通过深入研究推理流程、推理模型 ,详尽探讨了水口水电站工程系统综合推理库的设计和实现。基于模块化设计思想 ,并遵循重点突出、兼顾全面的原则 ,采用了清晰、合理的推理流程。系统综合推理库具有及时发现疑点测值 ,实时分析疑点成因 ... 详细信息

通过深入研究推理流程、推理模型 ,详尽探讨了水口水电站工程系统综合推理库的设计和实现。基于模块化设计思想 ,并遵循重点突出、兼顾全面的原则 ,采用了清晰、合理的推理流程。系统综合推理库具有及时发现疑点测值 ,实时分析疑点成因 ,准确评价大坝工作性态的功能。试运行结果表明 ,该推理库设计合理、功能完善、操作简便 ,为实时监控和综合评价大坝的安全性态提供了有力的技术支持。

关键词：水口水电站在线监控反馈分析安全性

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

Effect of cooling strategies on performance and mechanism of helical milling of CFRP/Ti-6Al-4V stacks

引用

Chinese Journal of Aeronautics 2022年第2期35卷 388-403页

作者： Jiaying GE Guang CHEN Yongxiang su Yunhe ZOU Chengzu REN Xuda QIN guofeng WANG Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin UniversityTianjin 300354China Tianjin Key Laboratory of Equipment Design and Manufacturing Technology Tianjin UniversityTianjin 300354China

Hole-making for Carbon Fiber Reinforced Plastics(CFRP)/Ti-6Al-4V stacks is crucial for the assembling strength of aircraft structure *** work carried out experimental work for helical milling(HM)of the stacks with sustainable cooling/lubrication(dry,MQL and cryogenic)*** forces and temperatures at the CFRP layer,Ti-6Al-4V layer and the interface of stacks were obtained by a developed measuring *** temperatures in CFRP machining at cryogenic condition varied from-167℃to-94℃,which were much lower than those at dry and MQL *** maximum temperature near the interface of stacks for the ninth hole was higher than 240℃due to heat conduction from Ti-6Al-4V *** hole quality,hole diameter and tool wear mechanism at different cooling/lubrication conditions were presented and *** condition generated mainly extrusion fracture for the fibers,due to the reduced friction effect compared with dry *** was helpful to reduce the feed mark at the hole surface of Ti-6Al-4V *** flank wear of cutting edge at MQL condition was better than those at dry and cryogenic *** cooling contributed to better CFRP surface with smaller delamination and hole entrance damage due to the increased resin strength and fiber *** damage near the entrance of CFRP were analyzed by the contact state of cutting edges and ***,hole diameters near the exit of CFPR layer were larger than other test *** work provided feasible processes for improving hole quality and tool life in hole-making of CFRP/Ti-6Al-4V stacks.

关键词： CFRP/Ti-6Al-4V stacks Cryogenic cooling Cutting temperature Helical milling MQL

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 ECAP Extrusion on the Microstructure, Mechanical Properties and Biodegradability of Mg–2Zn–xGd–0.5Zr Alloys

引用

Acta Metallurgica Sinica(English Letters) 2021年第2期34卷 205-216页

作者： Jun-Xiu Chen Xiang-Ying Zhu Li-Li Tan Ke Yang Xu-Ping su Key Laboratory of Materials surface Science and Technology of Jiangsu Province Changzhou UniversityChangzhou 213164China Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou UniversityChangzhou 213164China National Experimental Teaching Demonstration Center of Materials Science and Engineering Changzhou UniversityChangzhou 213164China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

Effects of equal channel angular pressing(ECAP)extrusion on the microstructure,mechanical properties and biodegradability of Mg–2Zn–xGd–0.5Zr(x=0,0.5,1,2 wt%)alloys were studied in this *** analysis,tensile test at ambient temperature,immersion test and electrochemical test in Hank’s solution were carried *** results showed that Gd could further enhance the grain refinement during the ECAP *** Gd addition and ECAP extrusion could improve the mechanical properties of the alloys,and the extrusion played the dominant *** addition of Gd(0.5–1 wt%)could obviously enhance the corrosion resistance of the *** some extent,ECAP extrusion improved the corrosion resistance of the alloys due to the change of second phases distribution and the refinement of *** increase in extrusion pass was detrimental to the improvement of the corrosion resistance as a result of increment of the grain boundaries.

关键词： Mg alloys Gd addition ECAP extrusion pass Mechanical property Biodegradable behavior

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

Separation process of butanol-butyl acetate-methyl isobutyl ketone system by the analysis to residual curve and the double effect pressure-swing distillation

引用

Chinese Journal of Chemical Engineering 2017年第3期25卷 274-277页

作者： Chunli Li Yuanyuan Song Jing Fang Yang Liu Weiyi su Yuqi Hu School of Chemical Engineering and Technology Hebei University of TechnologyTianfin 300130China

The separation of ternary mixture of butanol, butyl acetate, and methyl isobutyl ketone(MIBK) was initially analyzed by the residual curve. In this process, MIBK was chosen as the azeotropic agent during the first step of separation. The optimum mass ratio of extra MIBK was 1.6 in the modified feed stream according to the residual curve. Thus on this condition the top product was butanol-MIBK azeotrope while the bottom product was butyl acetate in the preliminary separation of the mixture. Then the butanol and MIBK azeotrope was separated by the double effect pressureswing distillation with the low pressure column performing at 30 kPa and the atmospheric pressure column at 101 kPa. The optimal operating conditions were then obtained by using Aspen Plus to simulate and optimize the process. The results showed that the mass purities of butanol, butyl acetate, and MIBK were all more than 99% and reached the design requirements. Additionally, compared with the traditional distillation with outside heating, the double effect pressure swing distillation saved the reboiler duty by 48.6% and the condenser duty by 44.6%.

关键词： Residual curve Azeotropic distillation Pressure-swing distillation Aspen Plus

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

高斯过程机器学习在边坡稳定性评价中的应用

引用

岩土力学 2009年第3期30卷 675-679,687页

作者：苏国韶宋咏春燕柳斌中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室武汉430071 广西大学土木建筑工程学院南宁530004 广西大学机械工程学院南宁530004

针对边坡工程是复杂的非线性系统,采用常规的理论分析和数值计算方法难以满足对边坡稳定性评价的高精度与快速性的要求,为此,提出对处理非线性复杂问题具有很好的适应性一种有概率意义的核学习机——高斯过程机器学习方法来解决边坡稳... 详细信息

针对边坡工程是复杂的非线性系统,采用常规的理论分析和数值计算方法难以满足对边坡稳定性评价的高精度与快速性的要求,为此,提出对处理非线性复杂问题具有很好的适应性一种有概率意义的核学习机——高斯过程机器学习方法来解决边坡稳定性的合理评价问题,建立了相应的边坡稳定性预测模型。工程应用研究结果表明,采用高斯过程机器学习方法进行边坡稳定性评价是科学可行的,该方法能很好地表达边坡稳定性与各影响因素之间的非线性映射关系,能方便快捷地给出合理可靠且具有概率意义的边坡稳定状态评价结果,为实现边坡快速设计的工程实践要求提供了一条新的途径。

关键词：岩土力学边坡稳定高斯过程机器学习

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

Quadratic Stability of Switched Nonlinear Systems in Block-triangular Form

引用

自动化学报 2005年第4期31卷 631-633页

作者： ZHAOSheng-zhi： ZHAOJun KeyLaboratoryofProcessIndustryAutomation MinistryofEducationNortheasternUniversityShenyang110004／／DepartmentofMathematicsLiaoningUniversityShenyang110036 KeyLaboratoryofProcessIndustryAutomation MinistryofEducationNortheasternUniversityShenyang110004

The problem of globally quadratic stability of switched nonlinear systems in block-triangular form under arbitrary switching is addressed. Under the assumption that all block-subsystems are zero input-to-state stable, a su?cient condition for the problem to be solvable ispresented. A common Lyapunov function is constructed iteratively by using the Lyapunov functionsof block-subsystems.

关键词：二次方程式非线性转换系统稳定性 Lyapunov函数

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

碰撞过程中内流河散货船与防撞护舷刚度比研究

引用

公路 2018年第6期63卷 101-106页

作者：苏波陈智于国军张抟江苏大学土木工程与力学学院

从应力波原理角度分析了内流河散货船船艏与防撞护舷刚度比对碰撞力以及护舷耗能的影响,采用刚度比对规范中碰撞力计算公式进行了转化,采用非线性有限元软件LS-DYNA,建立了内流河散货船与防撞护舷的碰撞模型,提出了内流河散货船与防撞... 详细信息

从应力波原理角度分析了内流河散货船船艏与防撞护舷刚度比对碰撞力以及护舷耗能的影响,采用刚度比对规范中碰撞力计算公式进行了转化,采用非线性有限元软件LS-DYNA,建立了内流河散货船与防撞护舷的碰撞模型,提出了内流河散货船与防撞护舷刚度比的建议取值。研究表明：船与防撞护舷之间的碰撞力,随着防撞护舷与船艏刚度比的增加先降低再增高,存在着碰撞力最低值。防撞护舷的耗能,随着护舷与船艏刚度比的减小而增大。在防撞护舷与船艏刚度比取值范围为4~15时,防撞护舷防护性能较优,可以充分降低船与护舷的碰撞力,护舷达到合理的耗能比例,对防撞护舷的设计存在指导意义。

关键词：船桥碰撞刚度比碰撞力护舷耗能数值仿真研究

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GPS获得的中国大陆现今地壳运动速度场

引用

地震 2014年第1期34卷 97-103页

作者：赵国强苏小宁中国地震局地震预测重点实验室北京100036

利用国家重大科学工程"中国地壳运动观测网络"1999至2011年底的全部GPS观测资料,采用统一的数据处理策略和最新的地球物理模型,分别获取了中国大陆相对于全球ITRF2005参考框架和欧亚板块的现今地壳水平运动速度场。通过速度场分析,给出... 详细信息

利用国家重大科学工程"中国地壳运动观测网络"1999至2011年底的全部GPS观测资料,采用统一的数据处理策略和最新的地球物理模型,分别获取了中国大陆相对于全球ITRF2005参考框架和欧亚板块的现今地壳水平运动速度场。通过速度场分析,给出了中国大陆地壳运动的大背景和基本特征,为地震预测、地球动力学等相关学科的研究提供了基础资料。

关键词：地壳运动速度场中国地壳运动观测网络 GPS 中国大陆

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：