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Quantum Impurity Models with Coupled Cluster Method

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Communications in Theoretical Physics 2010年第9期54卷 509-517页

作者： Clive Emary tobias Brandes Institut für Theoretische Physik

We investigate the ground-state properties of the Anderson single impurity model （finite Coulomb impurity repulsion） with the Coupled Cluster Method. We consider different CCM reference states and approximation schemes and make comparison with exact Green＇s function results for the non-interacting model and with Brillouin-Wigner perturbation theory for the full interacting model. Our results show that coupled cluster techniques are well suited to quantum impurity problems.

关键词： strongly correlated electrons Anderson model coupled-cluster method quantum impurity

Software for Small-scale Robotics: A Review

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International Journal of Automation and computing 2018年第5期15卷 515-524页

作者： tobias Tiemerding Sergej Fatikow Department of Computing Science Division Microrobotics and Control Engineering (AMiR) University of Oldenburg OFFIS–Institute for Information Technology R&D Division Automation and Integration Technology (AIT)

In recent years, a large number of relatively advanced and often ready-to-use robotic hardware components and systems have been developed for small-scale use. As these tools are mature, there is now a shift towards advanced applications. These often require automation and demand reliability, efficiency and decisional autonomy. New software tools and algorithms for artificial intelligence（AI） and machine learning（ML） can help here. However, since there are many software-based control approaches for small-scale robotics, it is rather unclear how these can be integrated and which approach may be used as a starting point. Therefore, this paper attempts to shed light on existing approaches with their advantages and disadvantages compared to established requirements. For this purpose, a survey was conducted in the target group. The software categories presented include vendor-provided software, robotic software frameworks（RSF）, scientific software and in-house developed software（IHDS）. Typical representatives for each category are described in detail, including Smar Act precision tool commander, Math Works Matlab and national instruments Lab VIEW, as well as the robot operating system（ROS）. The identified software categories and their representatives are rated for end user satisfaction based on functional and non-functional requirements, recommendations and learning curves. The paper concludes with a recommendation of ROS as a basis for future work.

关键词： Robotic control software engineering micro/nano robotics artificial intelligence (AI) machine learning (ML) open

Control of Strain Hardening Behavior in High-Mn Austenitic Steels

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Acta Metallurgica Sinica(English Letters) 2014年第3期27卷 546-556页

作者： Wenwen Song tobias Ingendahl Wolfgang Bleck Steel Institute RWTH Aachen University Intzestr.1 52072 AachenGermany

Austenitic high-Mn steels with Mn contents between approximately 15 and 30 wt% gain much interest because of their excellent mechanical properties and the option for adjusting strain hardening behavior due to different deformation mechanisms. 2D and 3D composition-dependent stacking fault energy （SFE） maps indicate the effect of chemical composition and temperature on SFE and consequently on the deformation mechanisms. Three steels with different chemical compositions and the same or different SFE are characterized in quasi-static tensile tests. The control parameters of strain hardening behavior in the high-Mn austenitic steels are described, and consequences for future developments are discussed.

关键词： High-Mn austenitic steels Stacking fault energy Strain hardening

Determining short chain fatty acids in sewage sludge hydrolysate: A comparison of three analytical methods and investigation of sample storage effects

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Journal of Environmental Sciences 2014年第4期26卷 926-933页

作者： Victor Ibrahim tobias Hey Karin Jonsson VA SYD SE-201 21 Malmo Sweden Water and Environmental Engineering Department of Chemical Engineering Lund University SE-21100 Lund Sweden

In anaerobic digestion, the production of short-chain fatty acids （SCFAs） can be beneficial or harmful to the overall process, depending on the concentration of accumulated acids. Therefore, the accurate determination of the SCFA concentration in both fresh and stored sludge hydrolysates is important. To select a suitable method for monitoring SCFAs during the anaerobic digestion of sewage sludge, the accuracy of three available analytical methods, including 5 pH point acid titration （TITRA5）, gas chromatography （GC）, and spectrophotometry, were compared in the present study. The results revealed that TITRA5 and GC displayed better agreement in the achieved measurements and higher precision and accuracy than the spectrophotometric assay, as supported by the application of different statistical models. TITRA5 excelled in titrating unfiltered hydrolysate while simultaneously measuring the alkalinity, whereas the GC method provided detailed information on the contribution of different fatty acids to the total acidity. In contrast, the spectrophotometric assay suffered from many forms of interference, depending on the sample＇s matrix. SCFA production followed the pattern of enzymatic reactions and fitted the Michaelis-Menten model. In addition to promoting TITRA5 as an accurate and robust analytical tool for routine SCFA analyses, this comparative study also demonstrated the possibility of storing hydrolysate samples at different temperatures and durations without altering the SCFA measurements.

关键词： five pH point titration gas chromatography spectrophotometry short-chain fatty acids sludge hydrolysis sample storage

A Mechanical Model for the Adhesion of Spiders to Nominally Flat Surfaces

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Journal of Bionic Engineering 2009年第2期6卷 135-142页

作者： Alessandro Gasparetto tobias Seidl Renato Vidoni DIEGM Department of ElectricalManagement and Mechanical EngineeringUniversity of Udine Advanced Concepts Team European Space Agency

In dry attachment systems of spiders and geckos, van der Waals forces mediate attraction between substrate and animal tarsus. In particular, the scopula of Evarcha arcuata spiders allows for reversible attachment and easy detachment to a broad range of surfaces. Hence, reproducing the scopula's roughness compatibility while maintaining anti-bunching features and dirt particle repellence behavior is a central task for a biomimetic transfer to an engineered model. In the present work we model the scopula of E. arcuata from a mechano-elastic point of view analyzing the influence of its hierarchical structure on the attachment behavior. By considering biological data of the gecko and spider, and the simulation results, the adhesive capabilities of the two animals are compared and important confirmations and new directives in order to reproduce the overall structure are found. Moreover, a possible suggestion of how the spider detaches in an easy and fast manner is proposed and supported by the results.

关键词： bionics spider dry adhesion mechano-elastic model hierarchical structure

Pandemic prevention and personality psychology: Gender differences in preventive health behaviors during COVID-19 and the roles of agreeableness and conscientiousness

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Journal of Safety Science and Resilience 2022年第1期3卷 87-91页

作者： tobias Otterbring Alexandra Festila Department of Management University of AgderKristiansandNorway Freelancer CopenhagenDenmark

One of the greatest public health crises in recent times,the COVID-19 pandemic,has come with a myriad of challenges in terms of health communication and public cooperation to prevent the spread of the ***-derstanding which are the key determinants that make certain individuals more cooperative is key in effectively tackling pandemics and similar future *** the present study(N=800),we investigated whether gen-der differences in compliance with preventive health behaviors(PHB)at the onset of the COVID-19 pandemic could be established,and,if so,whether the personality traits of agreeableness and conscientiousness could help explain this presumed *** with our theorizing,we found women to score higher than men on agreeableness and conscientiousness,and to be more willing to comply with a set of ***,both per-sonality traits were found to mediate the gender-compliance *** means that women’s greater compliance levels with PHB could,at least in part,be attributed to their higher agreeableness and conscientiousness scores.A greater understanding of the determinants of PHB in terms of gender and associated personality traits may help identify options for developing more effective communication campaigns,both in terms of communication channel selection and message content.

关键词： Covid-19 Pandemics Gender,personality Psychology Agreeableness Conscientiousness Preventive health behaviors

Identification of Characteristic Values in Impulse-Based Processes Using Small Specimens

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Nanomanufacturing and Metrology 2022年第3期5卷 310-323页

作者： tobias Valentino Tim Radel BIAS-Bremer Institut Fur Angewandte Strahltechnik GmbH Klagenfurter StraBe 528359 BremenGermany

Suitable approaches are needed for rapid and cost-efficient materials ***-throughput experimentation reduces the identification time of suitable material *** approach is to use small specimen geometries to save additional production ***,research is continuously being conducted on a new hardness test based on laser-induced shock *** far,characteristic values from the induced indentations have been extracted,which correlate with hardness and tensile ***,the indentation result varies in dependence of the specimen size and *** condition hinders the correlation between characteristic values and material ***,the goal was to induce similar indentation results to minimum specimen ***,different mounting materials and methods were *** created indentations were compared with those induced in large *** mounting parameters were derived from the ***,small specimens can be used for material characterization by considering these mounting parameters.

关键词： Mounting Stiffness Coefficient of restitution Forming efficiency Measuring instrument TEA-CO_(2)laser

On linear observers and application to fault detection in synchronous generators

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Control Theory and Technology 2014年第4期12卷 345-356页

作者： Jan Erik STELLET tobias ROGG Karlsruhe Institute of Technology Swiss Federal Institute of Technology

This work introduces an observer structure and highlights its distinct advantages in fault detection and isolation. Its application to the issue of shorted turns detection in synchronous generators is demonstrated. For the theoretical foundation, the convergence and design of Luenberger-type observers for disturbed linear time-invariant （LTI） single-input single-output （SISO） systems are reviewed with a particular focus on input and output disturbances. As an additional result, a simple observer design for stationary output disturbances that avoids a system order extension, as in classical results, is proposed.

关键词： Synchronous generators Field winding Fault detection Unknown input observer (UIO) Disturbance observer Residual generation

The presence and influence of glacier surging around the Geladandong ice caps,North East Tibetan Plateau

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Advances in Climate Change Research 2021年第3期12卷 299-312页

作者： Owen KING Atanu BHATTACHARYA tobias BOLCH Department of Geography and Sustainable Development University of St AndrewsSt AndrewsKY169ALUK Department of Remote Sensing and GIS JIS UniversityKolkata700109India

Many glaciers and ice caps on the Tibetan Plateau have retreated and lost mass in recent years in response to temperature increases,providing clear evidence of the impact of climate change on the *** is increasing evidence that many of the glaciers on the Tibetan Plateau have also shown periodically dynamic behaviour in the form of glacier surging and some even catastrophic collapse *** this study,we examine the prevalence of glacier surging at the Geladandong ice caps,North East Tibetan Plateau,to better understand the role of surge events in the evolution of glacier mass loss *** glacier surface elevation change data over the period 1969—2018 and glacier surface velocity data from the ITS_LIVE dataset,we find that 19 outlet glaciers of the ice caps are of *** multi-temporal measurements of glacier mass balance show that surge-type glacier mass budgets vary depending on the portion of the surge-cycle captured by geodetic *** the regional level,pre-and post-surge glacier mass loss variability does not bias regional mass budget estimates,but enhanced,or suppressed,mass loss estimates are likely when small groups of glaciers are *** results emphasise the importance of accurate surge-type glacier inventories and the need to maximise geodetic data coverage over glacierised regions known to contain surge-type glaciers.

关键词： Glacier surge Remote sensing Corona KH-4 Glacier mass balance ASTER Tibetan Plateau Glacier velocity