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Robustness evaluation of cutting tool maintenance planning for soft ground tunneling projects

Underground Space 2018年第1期3卷 72-85页

作者： Alena Conrads markus Scheffer markus konig markus Thewes Inastitute of Tunneling cand Construction Management Ruhr-Universitat BochunGermany Chair of Computing in Engineering Ruhr-Universitit BochunGermany

Tunnel boring machines require extensive maintenance and inspection effort to provide a high *** cutting tools of the cutting wheel must be changed timely upon reaching a critical *** one possible maintenance strategy is to change tools only when it is absolutely necessary,tools can also be changed preventively to avoid further *** different maintenance strategies inﬂuence the maintenance duration and the overall project ***,determine downtime related to a particular mainte-nance strategy is still a challenging *** paper shows an analysis of the robustness to achieve the planned project performance of a maintenance strategy considering uncertainties of wear behavior of the cutting tools.A simulation based analysis is presented,imple-menting an empirical wear prediction *** strategies of maintenance planning are compared by performing a parameter vari-ation study including Monte-Carlo *** maintenance costs are calculated and evaluated with respect to their ***,an improved and robust maintenance strategy has been determined.

关键词： Mechanized tunneling,Maintenance Wear of cutting tools Process simulation Robustness Uncertainty modeling

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Optimal measurement design for parameter identification in mechanized tunneling

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Underground Space 2018年第1期3卷 34-44页

作者： Raoul Holter Chenyang Zhao Elham Mahmoudi Arash AlimardaniLavasan Maria Datcheva markus konig Tom Schanz Ruhr-Universitit Bochum Department of Civil and Enviroromental EngineeringUniversititsstr.15044780 BochumGrmany Bulgarian Academy of Sciences Institute of MechanicsAcad.G Bonchew Stbl.41113 SofiaBulgaria

When performing shallow tunnel construction,settlements on the ground surface often cannot be *** these sur-face displacements is only possible with profound knowledge of the constitutive parameters of the surrounding *** inverse analysis on the basis of in situ settlement data is an effcient method for obtaining such ***,during this process,con-sidering which measurement arrangement can provide the most reliable results is generally *** aspect is addressed in this study by applying the so-called“optimal experimental design”to the mechanized tunnelingﬁeld.A global sensitivity analysis(GSA)isﬁrstly performed to determine the most relevant model parameters to be identiﬁed via back analysis,by employing the considered numerical model and experimental ***,the GSA results are utilized to determine where and when measurements should be performed to minimize uncertainty in the identiﬁed constitutive *** optimal experimental design(OED)concept is fur-ther applied to evaluate the observation set-up effciency for damage mitigation measures within a representative synthetic example of a tunneling project passing beneath an existing *** identiﬁcation based on synthetic noisy experiments is performed to validate the presented method for optimal experimental ***,the soil stiffness and strength parameters are identiﬁed according to both an intuitive and the elaborated method,employing the proposed OED strategy and experimental designs,making it possible to assess the feasibility of the OED results.

关键词： Mechanized tunneling,OptimacxperimI sensitivity analysis Back analysis

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Systematic literature review on smart contracts in the construction industry: Potentials,benefits, and challenges

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Frontiers of Engineering Management 2022年第2期9卷 196-213页

作者： Xuling YE Ningshuang ZENG markus konig Department of Civil and Environmental Engineering Ruhr-Universitat BochumUniversitatsstraBe 150D-44801 BochumGermany Department of Civil and Environmental Engineering Ruhr-Universitat BochumUniversitatsstraβe 150D-44801 BochumGermany Department of Construction Management and Real Estate School of Civil EngineeringSoutheast University(Jiulonghu Campus)Nanjing 210096China

The development of digital transformation in the construction industry has led to the increasing adoption of smart *** programmable applications to automatically write,verify,and enforce transaction conditions,smart contracts can be used in different areas mainly to improve automation level,information security,and built digital environment ***,the smart contract is commonly mentioned as a blockchain appendage,while its unique connotation and value in the construction industry have not been ***,this study carries out a systematic review based on 81 research articles published from 2014 to 2021 on smart contract applications in construction to explore and highlight their potentials under domain-specific *** are analyzed according to research type categorization and domain *** research domains are identified,where the three most highly explored domains are contract and payment,supply chain and logistics,and information *** integration of smart contracts with other innovative concepts and advanced technologies is *** applicability,benefits,and challenges of smart contract applications regarding different research domains are discussed.

关键词： smart contracts blockchain construction industry BIM systematic review

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HgTe量子阱中的量子自旋霍尔绝缘态

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中山大学研究生学刊（自然科学与医学版） 2007年第4期28卷 71-81页

作者： markus konig Steffen Wiedmann Christoph Brüne Andreas Roth Hartmut Buhmann Laurens W.Molenkamp 黄光耀赵安 Physikalisches Institut(EPIII) Universitat WürzburgD-97074 WürzburgGermany 中山大学理工学院

近来,理论研究预言量子霍尔效应,在外加磁场为0的情况下物质出现的一种全新的量子态可以在HgTe/(Hg,Cd)Te量子阱中实现。我们制造了低密度高迁移率的样品结构,在样品中我们可以通过外加栅极电压调节载流子从n型穿过绝缘区到p型。对于宽... 详细信息

近来,理论研究预言量子霍尔效应,在外加磁场为0的情况下物质出现的一种全新的量子态可以在HgTe/(Hg,Cd)Te量子阱中实现。我们制造了低密度高迁移率的样品结构,在样品中我们可以通过外加栅极电压调节载流子从n型穿过绝缘区到p型。对于宽度d6.3nm),在绝缘层中也出现接近2e2/h的剩余电导,其中e是电子电荷,h是Planck常数.剩余电导与样品宽度无关,证明这是由边缘态引起的.此外剩余电导可以被微小的外加磁场所破坏.在临界厚度d=6.3nm处发生的量子相变也与磁场诱发的绝缘-金属转变互相独立.这些观察结果为量子自旋霍尔效应提供了实验证据。

关键词：自旋霍尔效应边缘态量子阱

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Redox Regulation of Arabidopsis Mitochondrial Citrate Synthase

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Molecular Plant 2014年第1期7卷 156-169页

作者： Elisabeth Schmidtmann Ann-Christine konig Anne Orwat Dario Leister markus Hartl Iris Finkemeier Botany Department I of Biology Ludwig-Maximilians-University Munich Grosshaderner Strasse 2 82152 Planegg-Martinsried Germany

Citrate synthase has a key role in the tricarboxylic （TCA） cycle of mitochondria of all organisms, as it cata- lyzes the first committed step which is the fusion of a carbon-carbon bond between oxaloacetate and acetyl CoA. The regulation of TCA cycle function is especially important in plants, since mitochondrial activities have to be coordinated with photosynthesis. The posttranslational regulation of TCA cycle activity in plants is thus far almost entirely unexplored. Although several TCA cycle enzymes have been identified as thioredoxin targets in vitro, the existence of any thioredoxin-dependent regulation as known for the Calvin cycle, yet remains to be demonstrated. Here we have investigated the redox regulation of the Arabidopsis citrate synthase enzyme by site-directed mutagenesis of its six cysteine residues. Our results indicate that oxidation inhibits the enzyme activity by the formation of mixed disulfides, as the partially oxidized citrate synthase enzyme forms large redox-dependent aggregates. Furthermore, we were able to demonstrate that thioredoxin can cleave diverse intraas well as intermolecular disulfide bridges, which strongly enhances the activity of the enzyme. Activity measurements with the cysteine variants of the enzyme revealed important cysteine residues affecting total enzyme activity as well as the redox sensitivity of the enzyme.

关键词： citrate synthase mitochondria cysteine residues redox regulation thioredoxin TCA cycle Arabidopsis.

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