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Calibration of a rule-based intelligent network simulation model

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Journal of Modern Transportation 2016年第1期24卷 48-61页

作者： A. A. Memon M. Meng Y. D. Wong S. H. Lam IVES (International Vision for Engineering Solutions) Abu Dhabi United Arab Emirates tum create 1 CREATE Way #10-02 CREATE Tower Singapore 138602 Singapore School of Civil and Environmental Engineering Centre for Infrastructure Systems Nanyang Technological UniversitySingapore 639798 Singapore Transportation Infrastructure Office Macao S.A.R. China

This paper is focused on calibration of an intelligent network simulation model （INS1M） with reallife transportation network to analyse the INSIM＇s feasibility in simulating commuters＇ travel choice behaviour under the influence of real-time integrated multimodal traveller information （IMTI）. A transportation network model for the central and western areas of Singapore was simulated in PARAMICS and integrated with INSIM expert system by means of an application programming interface to form the INSIM. Upon calibration, INSIM was able to realistically present complicated scenarios in which real-time IMTI was provided to commuters and the network performance measures being recorded.

关键词： Traffic simulation Integrated travellerinformation. Calibration Mode choice

Automated regression test method for scientific computing libraries:Illustration with SPHinXsys

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Journal of Hydrodynamics 2024年第3期36卷 466-478页

作者： Bo Zhang Chi Zhang Xiangyu Hu tum School of Engineering and Design Technical University of MunichMunichGermany

Scientific computing libraries,whether in-house or open-source,have witnessed enormous progress in both engineering and scientific ***,it is important to ensure that modifications to the source code,prompted by bug fixing or new feature development,do not compromise the accuracy and functionality that have been already validated and *** paper introduces a method for establishing and implementing an automatic regression test environment,using the open-source multi-physics library SPHinXsys as an illustrative ***,a reference database for each benchmark test is generated from observed data across multiple *** comprehensive database encapsulates the maximum variation range of metrics for different strategies,including the time-averaged,ensemble-averaged,and dynamic time warping *** accounts for uncertainties arising from parallel computing,particle relaxation,physical instabilities,and ***,new results obtained after source code modifications undergo testing based on a curve-similarity comparison against the reference *** the source code is updated,the regression test is automatically executed for all test cases,providing a comprehensive assessment of the validity of the current *** regression test environment has been successfully implemented in all dynamic test cases within SPHinXsys,including fluid dynamics,solid mechanics,fluid-structure interaction,thermal and mass diffusion,reaction-diffusion,and their multi-physics couplings,and demonstrates robust capabilities in testing different *** is noted that while the current test environment is built and implemented for a particular scientific computing library,its underlying principles are generic and can be easily adapted for use with other libraries,achieving equal effectiveness.

关键词： Scientific computing open-source library verification and validation regression test automatic test environment curve similarity comparison smoothed particle hydrodynamics

Environmental responsibilities of livestock feeding using trace mineral supplements

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Animal Nutrition 2015年第3期1卷 113-118页

作者： Daniel Brugger Wilhelm M. Windisch Chair of Animal Nutrition TUM School of Life Sciences Technical University of Munich (TUM)

Trace elements are essential dietary components for livestock species. However, they also exhibit a strong toxic potential. Therefore, their fluxes through the animal organism are tightly regulated by a complex molecular machinery that controls the rate of absorption from the gut lumen as well as the amount of excretion via faeces, urine and products(e.g., milk) in order to maintain an internal equilibrium. When supplemented in doses above the gross requirement trace elements accumulate in urine and faeces and, hence, manure. Thereby, trace element emissions represent a potential threat to the environment. This fact is of particular importance in regard to the widely distributed feeding practice of pharmacological zinc and copper doses for the purpose of performance enhancement. Adverse environmental effects have been described, like impairment of plant production, accumulation in edible animal products and the water supply chain as well as the correlation between increased trace element loads and antimicrobial resistance. In the light of discussions about reducing the allowed upper limits for trace element loads in feed and manure from livestock production in the European Union excessive dosing needs to be critically reconsidered. Moreover, the precision in trace element feeding has to be increased in order to avoid unnecessary supplementation and, thereby, heavy metal emissions from livestock production.

关键词： Trace element Livestock Homeostasis Pharmacological supplementation Accumulation Environment

Strategies and challenges to increase the precision in feeding zinc to monogastric livestock

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Animal Nutrition 2017年第2期3卷 103-108页

作者： Daniel Brugger Wilhelm M.Windisch tum School of Life Sciences Weihenstephan Technical University of Munich

Practical diets for monogastric livestock must be supplemented with zinc(Zn) due to their high contents of antagonistic substances like phytates. Current feeding recommendations include quite generous safety margins because of uncertainties regarding the gross Zn requirements under varying rearing ***, the use of pharmacological Zn doses to stabilise animal performance and wellbeing is widespread. Taken together, modern diets for pigs and poultry contain considerably more Zn than necessary to meet animal requirements, which is associated with concerns related to the environment as well as animal and consumer safety. Therefore, European authorities most recently reduced the allowed upper limits for Zn in complete feed. To maintain animal productivity and wellbeing while reducing the Zn load in complete feed, all measures that stabilize feed Zn bioavailability must be applied. Most importantly, reliable information on the gross Zn requirement under practical conditions must be provided, considering the bioavailability of native or supplemented feed Zn, antagonisms with dietary factors as well as the physiological status of the animal.

关键词： Zinc Requirement Recommendation Pharmacological Pig Poultry

CO_(2)Plume Geothermal(CPG)Systems for Combined Heat and Power Production:an Evaluation of Various Plant Configurations

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Journal of Thermal Science 2022年第5期31卷 1266-1278页

作者： SCHIFFLECHNER Christopher WIELAND Christoph SPLIETHOFF Hartmut Chair of Energy Systems TUM School of Engineering and DesignTechnical University of Munich85747 GarchingGermany

CO_(2) Plume Geothermal(CPG)systems are a promising concept for utilising petrothermal resources in the context of a future carbon capture utilisation and sequestration *** geothermal energy has a tremendous worldwide potential for decarbonising both the power and heating *** paper investigates three potential CPG configurations for combined heating and power generation(CHP).The present work examines scenarios with reservoir depths of 4 km and 5 km,as well as required district heating system(DHS)supply temperatures of 70℃ and 90℃.The results reveal that a two-staged serial CHP concept eventuates in the highest achievable net power *** a thermosiphon system,the relative net power reduction by the CHP option compared with a sole power generation system is significantly lower than for a pumped *** net power reduction for pumped systems lies between 62.6%and 22.9%.For a thermosiphon system with a depth of 5 km and a required DHS supply temperature of 70℃,the achievable net power by the most beneficial CHP option is even 9.2%higher than for sole power generation *** second law efficiency for the sole power generation concepts are in a range between 33.0%and 43.0%.The second law efficiency can increase up to 63.0%in the case of a CHP ***,the combined heat and power generation can significantly increase the overall second law efficiency of a CPG *** evaluation of the achievable revenues demonstrates that a CHP application might improve the economic performance of both thermosiphon and pumped CPG ***,the minimum heat revenue required for compensating the power reduction increases with higher electricity *** summary,the results of this work provide valuable insights for the potential development of CPG systems for CHP applications and their economic feasibility.

关键词： deep geothermal energy combined heat and power generation CO_(2)plume geothermal systems petrothermal resources carbon capture utilisation and storage

Biomimetics in Production Organization -A Literature Study and Framework

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Journal of Bionic Engineering 2016年第2期13卷 200-212页

作者： Kirsten Reisen Ulrich Teschemacher Michael Niehues Gunther Reinhart Institute for Machine Tools and Industrial Management Technische Universitat Miinchen ( TUM) Boltzmannstrafle 15 85748 Garch ing Germany

Biomimetics is an established field in research and industry. Current approaches focus on the use of biological principles in product development, while large potentials have also been identified for transferring organisational principles from nature to production organisation. This study gives a comprehensive overview of existing literature and illustrates that only fragmented research is being conducted at present. In order to enable systematic translation into methods that are available to practitioners, a framework is developed which allows the body of literature to be structured and potential fields not being researched at present to be identified. It also points out that some biological principles receive more attention in research approaches and practical implementation in production organisation than others. Furthermore, correlations between biological principles and principles in production are identified that there have already been successful translations of biomimetic approaches to production organisation. On the other hand, it suggests that there are numerous promising approaches only described in an initial paper that need further research before they can be implemented in practice.

关键词： biomimetics framework production organisation optimization

An Eulerian SPH method with WENO reconstruction for compressible and incompressible flows

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Journal of Hydrodynamics 2023年第2期35卷 210-221页

作者： Zhentong Wang Chi Zhang Oskar J.Haidn Xiangyu Hu tum School of Engineering and Design Technical University of MunichMunichGermany Huawei Technologies Munich Research Center MunichGermany

While Eulerian smoothed particle hydrodynamics(SPH)method has received increasing attention in scientific and industrial communities owing to its high spatial accuracy,it exhibits excessive numerical dissipation due to the fact that the flux is derived in particle pair *** this paper,we adopt a one-dimensional weighted essentially non-oscillatory(WENO)reconstruction to reduce the numerical dissipation and improve the overall accuracy particularly in capturing the contact *** underlying principle is to construct a 4-point stencil along the interacting line of each particle pair and then the WENO scheme is applied to reconstruct the initial states of the Riemann problem which determines the flow flux.A set of benchmark tests for both compressible and incompressible flows are studied to investigate the accuracy,robustness and versatility of the proposed Eulerian SPH method with the WENO reconstruction(ESPH-WENO).

关键词： Eulerian smoothed particle hydrodynamics(SPH) compressible flows incompressible flows Riemann problem

Old dog,new trick:The PHR-SPX system regulates arbuscular mycorrhizal symbiosis

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Molecular Plant 2022年第2期15卷 225-227页

作者： Debatosh Das Caroline Gutjahr CUHK Shenzhen Research Institute No.10 Yuexing 2nd RoadNanshanShenzhenChina Plant Genetics TUM School of Life SciencesTechnical University of Munich(TUM)Emil Ramann Strasse 485354 FreisingGermany

Plant growth depends on the continuous availability of the macro-nutrient phosphate(Pi).However,in most soils,Pi is only poorly accessible to plants,resulting in Pi deficiency and triggering a number of Pi starvation *** strategy of plants to over-come Pi limitation is to form a symbiosis with arbuscular mycor-rhizal(AM)fungi(Smith et al.,2011),which occurs with approximately 80%of land *** fungi improve the uptake of Pi and other mineral nutrients and thereby increase plant performance and stress *** collect these minerals with an extraradical hyphal network from the soil and release them from highly branched structures,called arbuscules,into root cortex ***,Pi sufficiency causes inhibition of internal root colonization(Balzergue et al.,2011;Breuillin et al.,2010).The mechanistic basis for this has long remained *** studies have now solved this long-standing mystery and demonstrated that a canonical Pi-response regulatory module regulates AM symbiosis in accordance with the plant Pi status(Shi et al.,2021;Das et al.,2022).

关键词： thereby symbiosis release

Smoothed particle hydrodynamics:Methodology development and recent achievement

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Journal of Hydrodynamics 2022年第5期34卷 767-805页

作者： Chi Zhang Yu-jie Zhu Dong Wu Nikolaus A.Adams Xiangyu Hu tum School of Engineering and Design Technical University of MunichMunichGermany Xi’an Research Institute of High Technology Xi’an 710025China

Since its inception,the full Lagrangian meshless smoothed particle hydrodynamics(SPH)has experienced a tremendous enhancement in methodology and impacted a range of multi-physics applications in science and *** review presents a concise survey on latest developments and achievements of the SPH method,including:(1)Brief review of theory and fundamental with kernel corrections,(2)The Riemann-based SPH method with dissipation limiting and high-order data reconstruction by using MUSCL,WENO and MOOD schemes,(3)Particle neighbor searching with particle sorting and efficient dual-criteria time stepping schemes,(4)Total Lagrangian formulation with stablized,dynamics relaxation and hourglass control schemes,(5)Fluid-structure interaction scheme with interface treatments and multi-resolution discretizations,(6)Novel applications of particle relaxation in SPH methodology for mesh and particle *** but not least,benchmark tests for validating computational accuracy,convergence,robustness and efficiency are also supplied accordingly.

关键词： Smoothed particle hydrodynamics(SPH) Riemann-based SPH update and total Lagrangian formulations fluid-structure interaction mesh and particle generation