检索结果-南通市图书馆

Real-time estimation of the structural utilization level of segmental tunnel lining

Underground Space 2024年第4期17卷 132-145页

作者： Nicola Gottardi Steffen Freitag gunther meschke Institute for Structural Mechanics Ruhr University BochumBochum 44801Germany Institute for Structural Analysis Karlsruhe Institute of TechnologyKarlsruhe 76131Germany

Over the last decades,an expansion of the underground network has been taking place to cope with the increasing amount of moving people and *** a consequence,it is of vital importance to guarantee the full functionality of the tunnel network by means of preventive maintenance and the monitoring of the tunnel lining state over time.A new method has been developed for the real-time prediction of the utilization level in tunnel segmental linings based on input monitoring *** new concept is founded on a framework,which encompasses an offline and an online *** the former,the generation of feedforward neural networks is accomplished by employing synthetically produced *** element simulations of the lining structure are conducted to analyze the structural response under multiple loading *** scenarios are generated by assuming ranges of variation of the model input parameters to account for the uncertainty due to the not fully determined in situ *** and target quantities are identified to better assess the structural utilization of the *** latter phase consists in the application of the methodological framework on input monitored data,which allows for a real-time prediction of the physical quantities deployed for the estimation of the lining *** approach is validated on a full-scale test of segmental lining,where the predicted quantities are compared with the actual ***,it is investigated the influence of artificial noise added to the training data on the overall prediction performances and the benefits along with the limits of the concept are set out.

关键词： Segmental lining Artificial neural networks Structural utilization level Real-time prediction Structural health monitoring Monitoring data

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

A simulation-based software to support the real-time operational parameters selection of tunnel boring machines

引用

Underground Space 2024年第1期14卷 176-196页

作者： Yaman Zendaki Ba Trung Cao Abdullah Alsahly Steffen Freitag gunther meschke Institute for Structural Mechanics Ruhr University BochumBochum 44801Germany Institute for Structural Analysis Karlsruhe Institute of TechnologyKarlsruhe 76131Germany

With the fact that the main operational parameters of the construction process in mechanized tunneling are currently selected based on monitoring data and engineering experience without exploiting the advantages of computer methods,the focus of this work is to develop a simulation-based real-time assistant system to support the selection of operational *** choice of an appropriate set of these parameters(i.e.,the face support pressure,the grouting pressure,and the advance speed)during the operation of tunnel boring machines(TBM)is determined by evaluating different tunneling-induced soil-structure interactions such as the surface settlement,the associated risks on existing structures and the tunnel lining *** evaluate soil-structure behavior,an advanced process-oriented numerical simulation model based on the finite cell method is *** enable the real-time prediction capability of the simulation model for a practical application during the advancement of TBMs,surrogate models based on the Proper Orthogonal Decomposition and Radial Basis Functions(POD-RBF)are *** proposed approach is demonstrated through several synthetic numerical examples inspired by the data of real tunnel *** developed methods are integrated into a user-friendly application called SMART to serve as a support platform for tunnel engineers at construction *** to each user adjustment of the input parameters,i.e.,each TBM driving scenario,approximately two million outputs of soil-structure interactions are quickly predicted and visualized in seconds,which can provide the site engineers with a rough estimation of the impacts of the chosen scenario on structural responses of the tunnel and above ground structures.

关键词： Numerical simulation Surrogate model Real-time prediction Proper orthogonal decomposition Radial basis functions TBM operation Smart construction

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

A holistic approach for the investigation of lining response to mechanized tunneling induced construction loadings

引用

Underground Space 2018年第1期3卷 45-60页

作者： Vojtech Ernst Gall Ahmed Marwan Mario Smarslik Markus Obel Peter Mark gunther meschke Inustitute for Structural Mechanics Ruhr University BochumBochunGermany Institute of Concrete Structures Ruhr University BochumBochumGermany

Design methods for segmental tunnel linings used in mechanized tunnel constructions typically employ numerical bedded beam mod-els and/or classical analytical solutions for the determination of structural forces(*** and shear and axial forces)and simple load spreading assumptions for the design of the reinforcement in joint *** effcient such methods may be,many physical details are often overlooked and/or oversimpliﬁed in the process of reducing the actual structure to a structural beam model,***-lytically derived loadings are employed,the grouting and ground reactions are reduced to a spring bedding,and the conﬁnement due to grouting at the longitudinal joint is largely not considered in reinforcement *** a design process is not able to account for,or predict,the susceptibility of tunnel linings to often observed damages that,although they may not be structurally relevant,lead to ser-viceability or durability issues,such as crack development or chipping at the segment *** methods,such as the Finite Element Method,provide an opportunity to model the segmental tunnel lining and its response to the entire TBM construction process and to explicitly model the crack development within individual segments using modern methods to model the discontinuities in *** this contribution,a holistic modeling procedure for the representation of the tunnel lining within the tunneling process is pro-posed and compared to traditional lining models.A 3D process oriented Finite Element model is used to calculate the predicted forces on the tunnel lining and the obtained results are compared with those generated by traditional ***,the predicted defor-mations are then transferred to a detailed segment model in which the nonlinear response of the segment at the longitudinal joint is mod-eled using an interface element based approach to simulate concrete cracking.

关键词： Mechanized tunneling Segmental tunnel linings Finite element method

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

Editorial

引用

Underground Space 2018年第4期3卷 251-251页

作者： Gunter Hofstetter gunther meschke Kok-Kwang Phoon University of Innsbruck Austria Ruhr University Bochum Germany National University of Singapore Singapore

This special issue of Underground Space contains extended papers related to selected contributions at the International Conference on Computational Methods in Tunneling and Subsurface Engineering(EURO:TUN 2017).EURO:TUN 2017 was organized at the University of Innsbruck,*** was the fourth conference of a series of successful ECCOMAS Thematic Conferences on Computational Methods in Tunneling,which started in 2007 in Vienna and continued in 2009 and 2013 in Bochum.

关键词： continued Editorial organized

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

Sensory neurons: unveiling the symphony of wound healing

引用

Signal Transduction and Targeted Therapy 2024年第8期9卷 3158-3160页

作者： Dongsheng Jiang Hans-gunther Machens Yuval Rinkevich Precision Research Center for Refractory Diseases Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghaiChina Trauma Medical Center Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghaiChina Department of Plastic and Hand Surgery Klinikum rechts der IsarSchool of MedicineTechnical University of MunichMunichGermany Institute of Regenerative Biology and Medicine Helmholtz Center MunichMunichGermany

In a recent paper published in Nature,Lu et *** a pivotal role of Nav1.8+nociceptor-released neuropeptide calcitonin generelated peptide(CGRP)in modulating the activities of myeloid cells during skin and muscle injury... 详细信息

关键词： healing wound al.

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

创造性解决问题的“TRIZ逆向”方法

引用

应用型高等教育研究 2024年第1期9卷 44-50页

作者： Swen gunther 德累斯顿应用科学大学德国德累斯顿01069

TRIZ(俄语缩写)或TIPS(Theory of Inventive Problem Solving)是在理论界和实践中公认的一种创造性解决问题的方法。它通过系统化的方式解决(技术)冲突,从而推动产品或工艺的创新。德累斯顿应用科学大学的研究表明,该方法也可以反向使用... 详细信息

TRIZ(俄语缩写)或TIPS(Theory of Inventive Problem Solving)是在理论界和实践中公认的一种创造性解决问题的方法。它通过系统化的方式解决(技术)冲突,从而推动产品或工艺的创新。德累斯顿应用科学大学的研究表明,该方法也可以反向使用,称之为"TRIZReverse",即TRIZ逆向方法。详细阐释这两种方法,对于人才培养具有重要意义。

关键词： TRIZ逆向创造性地解决问题逆向创造技术转化

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

Heterogeneous tunable Ⅲ-Ⅴ-on-silicon-nitride mode-locked laser emitting wide optical spectra

引用

Photonics Research 2024年第3期12卷 I0021-I0027页

作者： MAXIMILIEN BILLET STIJN CUYVERS STIJN POELMAN ARTUR HERMANS SANDEEP SEEMA SASEENDRA TASUKU NAKAMURA SHINYA OKAMOTO YASUHISA INADA KAZUYA HISADA TAKU HIRASAWA JOAN RAMIREZ DELPHINE NÉEL NICOLAS VAISSIÈRE JEAN DECOBERT PHILIPPE SOUSSAN XAVIER ROTTENBERG gunther ROELKENS JONØ.KJELLMAN BART KUYKEN Photonics Research Group Department of Information TechnologyGhent University-imec9052 GhentBelgium imec 3001 LeuvenBelgium Technology Division Panasonic Holdings CorporationMoriguchi-CityOsakaJapan Ⅲ-Ⅴ Lab F91767 PalaiseauFrance

We demonstrate a Ⅲ-Ⅴ-on-silicon-nitride mode-locked laser through the heterogeneous integration of a semiconductor optical amplifier on a passive silicon-nitride cavity using the technique of micro-transfer printing. In the initial phase of our study, we focus on optimizing the lasing wavelength to be centered at 1550 nm. This optimization is achieved by conducting experiments with 27 mode-locked lasers, each incorporating optical amplifiers featuring distinct multiple-quantum-well photoluminescence values. Subsequently we present a comprehensive study investigating the behavior of the mode-locking regime when the electrical driving parameters are varied. Specifically, we explore the impact of the gain voltage and saturable absorber current on the locking stability of a tunable mode-locked laser. By manipulating these parameters, we demonstrate the precise control of the optical spectrum across a wide range of wavelengths spanning from 1530 to 1580 nm. Furthermore, we implement an optimization approach based on a Monte Carlo analysis aimed at enhancing the mode overlap within the gain region. This adjustment enables the achievement of a laser emitting a 23-nm-wide spectrum while maintaining a defined 10 dB bandwidth for a pulse repetition rate of 3 GHz.

关键词： tunable amplifier mode

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

A Glimpse into the Natural History of Leiolepis rubritaeniata Mertens,1961(Squamata:Leiolepididae)

引用

Asian Herpetological Research 2023年第2期14卷 147-155页

作者： gunther KÖHLER Panupong THAMMACHOTI Senckenberg Forschungsinstitut und Naturmuseum Senckenberganlage 25Frankfurt a.M.60325Germany Department of Biology Faculty of ScienceChulalongkorn UniversityBangkok 10330Thailand

During the months of April through July 2020 we studied aspects of the natural history of Leiolepis rubritaeniata,a species of butterfly lizard that occurs on the Khorat Plateau in Thailand and adjacent regions of Laos and Cambodia as well as in south-central *** present data on population size and structure,as well as location,size,compass orientation,and structure of the lizard’s ***,we present climatic data(ambient air temperature and precipitation)at the study site for the duration of our field work as well as temperature data for the complete year ***,we provide data on egg laying,incubation conditions and characteristics of the ***,we present an easy to use and reliable non-invasive method for the long-term recognition of individual butterfly lizards based on their unique dorsal *** lizards are utilized as a food source for the local human *** far,there are no farming projects in Thailand involving this species and all individuals are collected from the wild *** data are available on the population dynamics of *** but it can be assumed that habitat destruction due to land use change as well as its utilization for human consumption have negative effects on the long-term survival of the local populations of this lizard *** baseline data presented here are essential for any meaningful conservation strategy for these lizards.

关键词： Burrow structure butterfly lizard ecology Khorat Plateau Southeast Asia Squamata

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

Influence of Ti Powder Characteristics on Combustion Synthesis of Porous NiTi Alloy

引用

Journal of Materials Science & Technology 2002年第3期18卷 248-250页

作者： YonghuaLI V.E.gunther 等 InstituteofMetalResearch ChineseAcademyofScienceskShenyang110016China ScientificResearchInstituteofMedicalMaterialsandShapeMemoryImplats Tomsk634034Russia

Porous NiTi shape memory alloy (SMA) is a novel biomedical material used for human hard tissue implant. The influence of elemental titanium powder characteristics such as powder morphology, particle size and specific surface area (SSA) on the minimal ignition temperature, combustion temperature and final product of porous NiTi SMA fabricated by combustion synthesis method was investigated in this paper by scanning electron microscopy (SEM) and laser diffraction. The preliminary data indicated that the titanium powder characteristics had a strong effect on combustion synthesis of porous NiTi SMA.

关键词： Porous NiTi shape memory alloy Combustion synthesis Titanium powder characteristics

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

A New Convergent Explicit Tree-Grid Method for HJB Equations in One Space Dimension

引用

Numerical Mathematics(Theory,Methods and Applications) 2018年第1期11卷 1-29页

作者： Igor Kossaczky Matthias Ehrhardt Michael gunther Lehrstuhl fur Angewandte Mathematik und Numerische Analysis Fakultat fur Mathematik und NaturwissenschaftenBergische Universitat WuppertalGaußstrasse 2042119 WuppertalGermany

In this work we introduce a new unconditionally convergent explicit Tree-Grid Method for solving stochastic control problems with one space and one time dimension or equivalently,the corresponding Hamilton-Jacobi-Bellman *** prove the convergence of the method and outline the relationships to other numerical *** case of vanishing diffusion is treated by introducing an artificial diffusion *** illustrate the superiority of our method to the standardly used implicit finite difference method on two numerical examples from finance.

关键词： Tree-Grid Method Hamilton-Jacobi-Bellman equation Stochastic control problem

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

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：