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22nd International Conference on Engineering design, ICED 2019

作者： Hashemi Farzaneh, Helena Angele, Ferdinand Zimmermann, Markus Technical University of Munich Germany Technical University of Munich Laboratory of Product Development and Lightweight Design Germany

Bio-inspired design is an innovative methodology for transferring biological solutions into technical solutions, for example for the design of weight- and load-optimized components. Bio-inspired design therefore offers great potential for meeting the challenges of designing additively manufactured components, such as avoiding warpage, supporting structures and material minimisation. Nevertheless, apart from bio-inspired topology optimization tools, bio-inspired design is rarely used in industrial practice because for many companies the practical applicability up to the prototype is not obvious. The aim of this work is therefore a practical approach to the search for biological systems, analysis, abstraction and transfer of analogies. We apply bio-inspired design on the design of a microtiter plate manufactured by stereolithography, whose dimensional accuracy is impaired by warpage. Here, the venus' flower basket, a deep-sea sponge, can serve as a model. It has a hierarchical structure of silicate needles whose elements are abstracted for bio-inspired transfer. We show and evaluate the transfer of different analogies using a prototype. © 2019 design Society. All rights reserved.

关键词： 3D printers

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Three-Dimensional Architecture of Multichannel Carbon Fibers for Enhanced Lithium and Sodium Storage Properties

SSRN

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SSRN 2022年

作者： Zhang, Jintao Li, Dong-Sheng Leong, Zhi Yi Qiu, Jianbei Xu, Xuhui Yang, Hui Ying Pillar of Engineering Product Development Singapore University of Technology and Design 8 Somapah Road 487372 Singapore College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials China Three Gorges University Yichang443002 China Key Laboratory of Advanced Materials of Yunnan Province Kunming University of Science and Technology Kunming Yunnan650093 China

Transition metal sulfides have garnered considerable attention in recent times as promising anode materials due to their high theoretical capacities for lithium and sodium storage. However, pristine metal sulfides suffer from poor rate and cycling stability. Herein, Se substituted NiS2 (denoted as NiSexS2-x) nanoparticles decorated multichannel carbon fibers (MCF/NiSexS2-x) were fabricated as anode materials for lithium and sodium-ion batteries. The distinct composition and unique architecture endow MCF/NiSexS2-x with enhanced reaction kinetics, improved electric conductivity, and superior structural stability. Consequently, the MCF/NiSexS2-x anode delivered a high capacity of >475 mAh g-1 at 1 A g-1 for Li storage with a highly stable cycle life of over 300 cycles. Moreover, when applied in sodium-ion batteries, MCF/NiSexS2-x achieved a superior capacity of > 456 mAh g-1 at 0.2 A g-1 over 100 cycles with good rate retention. © 2022, The Authors. All rights reserved.

关键词： Storage (materials)

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Predicting crack growth and fatigue life with surrogate models

arXiv

引用

arXiv 2020年

作者： Pfingstl, Simon Rios, Jose Ignacio Baier, Horst Zimmermann, Markus Laboratory for Product Development and Lightweight Design Technical University of Munich Boltzmannstr. 15 Garching85748 Germany

Fatigue-induced damage is still one of the most uncertain failures in structural systems. Prognostic health monitoring together with surrogate models can help to predict the fatigue life of a structure. This paper demonstrates how to combine data from previously observed crack evolutions with data from the currently observed structure in order to predict crack growth and the total fatigue life. We show the application of one physics-based model, which is based on Paris’ law, and four mathematical surrogate models: recurrent neural networks, Gaussian process regression, k-nearest neighbors, and support vector regression. For a coupon test, we predict the time to failure and the crack growth with confidence intervals. Moreover, we compare the performance of all proposed models by the mean absolute error, coefficient of determination, mean of log-likelihood, and their confidence intervals. The results show that the best mathematical surrogate models are Gaussian process regression and recurrent neural networks. Furthermore, this paper shows that the mathematical surrogate models tend to have conservative confidence intervals, whereas the physics-based model exhibits overly optimistic (too small) confidence intervals. Copyright © 2020, The Authors. All rights reserved.

关键词： Recurrent neural networks

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Flame-Assisted Ultrafast Synthesis of Functionalized Carbon Nanosheets for High-Performance Sodium Storage

SSRN

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SSRN 2023年

作者： Chen, Chen Yan, Dong Von Lim, Yew Li, Xueliang Chen, Junjie Li, Tianchen Zhu, Youyu Cai, Jiangtao Huang, Ying Zhang, Yating Yang, Hui Ying Liu, Lei School of Chemistry and Chemical Engineering Northwestern Polytechnical University Shaanxi Xi’an710072 China Pillar of Engineering Product Development Singapore University of Technology and Design 8 Somapah Road Singapore487372 Singapore International Joint Laboratory of New Energy Materials and Devices of Henan Province School of Physics & Electronics Henan University Kaifeng475004 China College of Chemistry and Chemical Engineering Xi’an University of Science and Technology Shaanxi Xi'An710054 China

Traditional methods in preparation of hard carbon (HC) requires special equipment, long reaction times, and large energy consumption, resulting in low throughputs and efficiency. In our contribution, a novel synthesis method is proposed, involving the formation of HC nanosheet within minutes by flame combustion in air, and further introduction of sulfur and nitrogen sources to achieve heteroatom doping. It was confirmed by HRTEM, XPS, EPR, and Raman that HC prepared by flame combustion are rich in defects, pores and heteroatom functional groups. Combined with density functional theory calculation, it is verified that the functionalized hard carbon has stronger Na+ adsorption ability, electron gain ability, and Na+ migration ability. As a result, NS-CNs as sodium-ion battery anodes provide an ultra-high reversible capacity of 542.7 mAh/g at 50 mA/g, and excellent rate performance with reversible capacity of 236.4 mAh/g at 2 A/g after 1200 cycles. Furthermore, the NS-CNs can serve as an outstanding anode for full cells. This work provides a novel and facile strategy to develop novel carbons, and gives the deep insights for the further investigation of facile preparation method to develop high-performance carbon anodes for alkali-ion batteries. © 2023, The Authors. All rights reserved.

关键词： Sodium-ion batteries

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On the potential of extending aircraft service time using load monitoring

arXiv

引用

arXiv 2020年

作者： Pfingstl, Simon Steinweg, Dominik Zimmermann, Markus Hornung, Mirko Laboratory for Product Development and Lightweight Design Boltzmannstr. 15 Germany Economics and Transportation Willy-Messerschmitt-Str. 1 Germany Laboratory for Product Development and Lightweight Design Boltzmannstr. 15 Germany Research and Technology Willy-Messerschmitt-Str. 1 Germany

Aircraft structures experience various kinds of loads over their entire lifetime, typically leading to fatigue and ultimately structural failure. In order to avoid structural failure during operation, the maximum number of flight cycles and flight hours is regulated by laws ensuring continued airworthiness. However, since every flight impacts the aircraft differently, not all airframes are equally stressed at the time of decommissioning. This paper proposes a new retirement criterion based on the so-called fatigue damage index (FDI). The criterion takes into account that aircraft are differently operated and thus enables an individual decommissioning of aircraft without compromising its safety. Based on aircraft sample data covering 95% of the Airbus A320 fleet over two years, the enhanced decommissioning criterion is estimated to significantly extend the average aircraft service life. The impact varies within the fleet, depending on the experienced seat load factors, cruise altitudes, and taxi times considered for the individual aircraft during operation. While seat load factors and flight altitudes significantly affect the defined FDI, the influence of taxi times is only minor. Based on the estimated increase in aircraft service life, the paper argues that for service life extensions, the FDI shall be considered as the limit of validity in the regulatory framework governing the decommissioning of aircraft. Copyright © 2020, The Authors. All rights reserved.

关键词： Fatigue damage

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Scheme for automatic differentiation of complex loss functions with applications in quantum physics

引用

Physical Review E 2021年第1期103卷 013309-013309页

作者： Chu Guo Dario Poletti Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China Science and Math Cluster and Engineering Product Development Singapore University of Technology and Design 8 Somapah Road 487372 Singapore

The past few years have seen a significant transfer of tools from machine learning to solve quantum physics problems. Automatic differentiation is one standard algorithm used to efficiently compute gradients of loss functions for generic neural networks. In this work we show how to extend automatic differentiation to the case of complex loss function in a way that can be readily implemented in existing frameworks and which is compatible with the common case of real loss functions. We then combine this tool with matrix product states and apply it to compute the ground state and the steady state of a close and an open quantum system. Compared to the traditional density matrix renormalization group algorithm, complex automatic differentiation allows both straightforward GPU accelerations as well as generalizations to different types of tensor and neural networks.

关键词： Density matrix methods Machine learning

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Addressing the issue of stigma-free design through critical design workshops 21

Addressing the issue of stigma-free design through critical ...

引用

21st International Conference on Engineering and product design Education, E and PDE 2019

作者： Torkildsby, Anne Britt Vaes, Kristof Norwegian Research Laboratory for Universal Design NTNU Norwegian University of Science and Technology Norway Department of Product Development Faculty of Design Sciences University of Antwerp Belgium

ISBN: (纸本)9781912254057

Stereotypes and prejudices are a ubiquitous cultural phenomenon that can impinge on peoples’ wellbeing. Moreover, the power of public stigma can make users of certain products experience discrimination, alienation, and inequality. Such experiences increase the likelihood of individuals rejecting products, services, environments, etc. altogether, often depriving them of e.g. safety, efficiency, and independence. In a worst-case scenario this can lead to a stigmatised condition that triggers further inequality and exclusion. In an increasingly complex world, it is imperative that those responsible for addressing future needs, challenges, and demands, i.e. the next generation of designers, architects, engineers, etc., are adequately equipped as regards methods and tools for battling existing stereotypes and prejudices related to social growth and development in society. Through this, they will ensure that stigma-free design is a priority when initiating, planning, and executing future projects. The purpose of this paper is to describe what happens when critical design is used to explore the stigma associated with existing products, services, environments, etc. in the context of interdisciplinary workshops, and to discuss the results so far. Furthermore, the paper examines whether and how this upside-down way of thinking about and performing design is a good contribution to the fields of design, architecture, engineering, etc. as a method of both teaching and learning about equality, diversity, and inclusion. © 2019 Institution of Engineering designers, The design Society. All rights reserved.

关键词： Semantics

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Two-dimensional SnS2 nanosheets on Prussian blue template for high performance sodium ion batteries

引用

Frontiers of Chemical Science and Engineering 2019年第3期13卷 493-500页

作者： Glenn J. Sim Kakui Ma Zhixiang Huang Shaozhuan Huang Ye Wang Huiying Yang Pillar of Engineering Product Development Singapore University of Technology and DesignSingapore 487372Singapor Airbus Group Innovations Singapore Singapore 797562Singapore Key Laboratory of Materials Physics of Ministry of Education Department of Physics and EngineeringZhengzhou UniversityZhengzhou 450052China

Three-dimensional Prussian blue (PB) nanostructures was obtained via a one-step hydrothermal method. Subsequently, two-dimensional tin disulfide (SnS2) nanosheets were grown onto PB through a facile hydrothermal synthesis. The as prepared SnS2/PB is further employed as the anode of sodium ion batteries (SIBs). S11S2/PB nanoarchitecture delivers a specific capacity of 725.7 mAh·g-1 at 50 mA·g-1. When put through more than 200 cycles, it achieved a stable cycling capacity of 400 m Ah·g^-1 at 200 m A·g^i. The stable Na^+ storage properties of SnS2/PB was attributed to the synergistic effect among the conductive PB carbon, used as the template in this work. These results obtained potentially paves the way for the development of excellent electrochemical performance with stable performance of SIBs.

关键词： Prussian blue carbon nanocubes tin disulfide sodium ion batteries

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Cooperative Catalytic Mo-S-Co Heterojunctions with Sulfur Vacancies for Kinetically Boosted Lithium-Sulfur Battery

SSRN

引用

SSRN 2022年

作者： Huang, Shaozhuan Song, Haobin Li, Tong He, Tingting Wang, Zhouhao Fang, Daliang Wang, Ye Li, Xue Liang Hu, Junping Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education Hubei Key Laboratory of Catalysis and Materials Science South-Central University for Nationalities Wuhan430074 China Pillar of Engineering Product Development Singapore University of Technology and Design 8 Somapah Road Singapore487372 Singapore Key Laboratory of Material Physics Ministry of Education School of Physics and Microelectronics Zhengzhou University Zhengzhou450052 China Key Laboratory of Optoelectronic Materials and New Energy Technology Nanchang Key Laboratory of Photoelectric Conversion and Energy Storage Materials Nanchang Institute of Technology Nanchang330099 China

Smart design of catalytic materials with unique architectures has a significant impact on regulating the polysulfides (LiPSs) conversion and boosting the performance of Li−S batteries. Here, we report the smart design of synergistic heterostructure with sulfur vacancy in Mo-S-Co heterojunction as a cooperative catalyst for fast and bidirectional LiPSs conversion. The S vacancy engineering in both components of MoS2-x-Co9S8-y heterostructure significantly improves the electrical conductivity of Mo-S-Co heterojunction. Moreover, the 2D MoS2-x provides fast Li+ diffusion kinetics, while Co9S8-y affords enhanced chemisorption for LiPSs. The synergistic effect makes the Mo-S-Co heterojunction as "hot sites" to catalyze the LiPSs conversion, where electron transportation proceeds through the rGO→MoS2-x→heterojunction routes and Li+ diffuses along the MoS2-x→heterojunction paths. The coupled fast Li+/e- transportation of MoS2-x-Co9S8-y enables direct and fast LiPSs "adsorption-conversion" at the catalytic Mo-S-Co heterojunction with bidirectional catalytic properties. Due to the ingenious co-engineering of S vacancy and heterointerface, the Li−S cell with MoS2-x-Co9S8-y/rGO interlayer delivers high sulfur utilization (1382.5 mAh g-1 at 0.1 C), excellent rate capability (710.2 mAh g-1 at 3 C), and long cycle life over 600 cycles (0.06% capacity decay per cycle). This work demonstrates the great potential of anion deficiency and heterojunction co-construction for high-performance Li−S batteries. © 2022, The Authors. All rights reserved.

关键词： Heterojunctions

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Emergence of steady quantum transport in a superconducting processor

arXiv

引用

arXiv 2024年

作者： Zhang, Pengfei Gao, Yu Xu, Xiansong Wang, Ning Dong, Hang Guo, Chu Deng, Jinfeng Zhang, Xu Chen, Jiachen Xu, Shibo Wang, Ke Wu, Yaozu Zhang, Chuanyu Jin, Feitong Zhu, Xuhao Zhang, Aosai Zou, Yiren Tan, Ziqi Cui, Zhengyi Zhu, Zitian Shen, Fanhao Li, Tingting Zhong, Jiarun Bao, Zehang Zhao, Liangtian Hao, Jie Li, Hekang Wang, Zhen Song, Chao Guo, Qiujiang Wang, H. Poletti, Dario School of Physics ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang Key Laboratory of Micro-nano Quantum Chips and Quantum Control Zhejiang University Hangzhou China Science Mathematics and Technology Cluster Singapore University of Technology and Design 8 Somapah Road Singapore487372 Singapore College of Physics and Electronic Engineering Center for Computational Sciences Sichuan Normal University Chengdu610068 China Henan Key Laboratory of Quantum Information and Cryptography Zhengzhou450001 China Institute of Automation Chinese Academy of Sciences Beijing100190 China Engineering Product Development Pillar Singapore University of Technology and Design 8 Somapah Road Singapore487372 Singapore Centre for Quantum Technologies National University of Singapore Singapore117543 Singapore MajuLab CNRS-UNS-NUS-NTU International Joint Research Unit UMI 3654 Singapore Singapore

Non-equilibrium quantum transport is crucial to technological advances ranging from nanoelectronics to thermal management. In essence, it deals with the coherent transfer of energy and (quasi-)particles through quantum channels between thermodynamic baths. A complete understanding of quantum transport thus requires the ability to simulate and probe macroscopic and microscopic physics on equal footing. Using a superconducting quantum processor, we demonstrate the emergence of non-equilibrium steady quantum transport by emulating the baths with qubit ladders and realising steady particle currents between the baths. We experimentally show that the currents are independent of the microscopic details of bath initialisation, and their temporal fluctuations decrease rapidly with the size of the baths, emulating those predicted by thermodynamic baths. The above characteristics are experimental evidence of pure-state statistical mechanics and prethermalisation in non-equilibrium many-body quantum systems. Furthermore, by utilising precise controls and measurements with single-site resolution, we demonstrate the capability to tune steady currents by manipulating the macroscopic properties of the baths, including filling and spectral properties. Our investigation paves the way for a new generation of experimental exploration of non-equilibrium quantum transport in strongly correlated quantum matter. © 2024, CC BY.

关键词： Statistical mechanics

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