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OpenAP.top: Open Flight Trajectory Optimization for Air Transport and Sustainability Research

Sun, Junzi (author)

Trajectory optimization has been an active area of research for air transport studies for several decades. But almost all flight optimizers proposed in the literature remain close-sourced, which presents a major disadvantage for the advancement of scientific research. This optimization depends on aircraft performance models, emission models, and...

journal article 2022

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Research Progress on Convective Heat Transfer Characteristics of Supercritical Fluids in Curved Tube

Liu, Xinxin (author), Li, Shuoshuo (author), Liu, Liang (author), He, Chao (author), Sun, Zhuang (author), Özdemir, F. (author), Aziz, Muhammad (author), Kuo, Po-Chih (author)

Because of their compact structure, ease of processing and higher heat transfer coefficient, curved-tube heat exchangers are widely applied in various industry applications, such as nuclear power systems, solar-powered engineering, aircraft engine cooling systems and refrigeration and cryogenic systems. Accurate knowledge about the heat transfer...

journal article 2022

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Evaluation of rheology and strength development of alkali-activated slag with different silicates sources

Sun, Yubo (author), Ghorbani, Saeid (author), Dai, Xiaodi (author), Ye, G. (author), De Schutter, Geert (author)

This study provides a detailed investigation on the reproducibility of two groups of alkali-activated slag (AAS) mixtures, from both fresh properties and strength development perspectives. Three different commercial sodium silicate solutions and one lab-produced silicate activator (made of silica fume and sodium hydroxide) were used to...

journal article 2022

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Joint energy consumption optimization method for wing-diesel engine-powered hybrid ships towards a more energy-efficient shipping

Wang, Kai (author), Xue, Yu (author), Xu, Hao (author), Huang, Lianzhong (author), Ma, Ranqi (author), Zhang, Peng (author), Jiang, X. (author), Yuan, Yupeng (author), Negenborn, R.R. (author), Sun, Peiting (author)

Wing-diesel engine-powered hybrid ships can effectively reduce fuel consumption and CO₂ emissions by using wind energy as the auxiliary driving power. The energy optimization management of the hybrid system can further improve the ship's energy efficiency. To achieve this purpose, it is significant to establish an effective energy...

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Fresh and hardened properties of alkali-activated slag concrete: The effect of fly ash as a supplementary precursor

Sun, Yubo (author), Liu, Zhiyuan (author), Ghorbani, Saeid (author), Ye, G. (author), De Schutter, Geert (author)

The present study explores the possibility of replacing blast furnace slag (BFS) with coal fly ash (FA) to produce alkali-activated material (AAM) concrete with hybrid precursors. With an increased FA replacement ratio, the reaction kinetics, fresh and hardened properties of AAM mixtures have been investigated. The retardation effect on the...

journal article 2022

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A STAMP-based approach to quantitative resilience assessment of chemical process systems

Sun, H. (author), Wang, Haiqing (author), Yang, M. (author), Reniers, G.L.L.M.E. (author)

Chemical process systems (CPSs) involve complex dynamic processes. Besides, the emergent and uncertain hazards and disruptions cannot be identified entirely and prevented by conventional methods. In those situations, resilience for CPSs plays an essential role in absorbing, adapting to disruptions, and restoring from damages. Systemic modeling...

journal article 2022

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Neural network model for predicting variation in walking dynamics of pedestrians in social groups

Sun, Shi (author), Sun, Cheng (author), Duives, D.C. (author), Hoogendoorn, S.P. (author)

Pedestrian spaces are increasingly becoming popular locations for shopping, recreation, festivities, and other social activities. Therefore, an improved understanding of the factors that make walking environments enjoyable and safe is essential. Most existing studies focus on modelling walking behaviours of individual pedestrians. However,...

journal article 2022

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Application of YOLOv4 Algorithm for Foreign Object Detection on a Belt Conveyor in a Low-Illumination Environment

Chen, Yiming (author), Sun, Xu (author), Xu, Liang (author), Ma, Sencai (author), Li, Jun (author), Pang, Y. (author), Cheng, Gang (author)

The most common failures of belt conveyors are runout, coal piles and longitudinal tears. The detection methods for longitudinal tearing are currently not particularly effective. A key study area for minimizing longitudinal belt tears with the advancement of machine learning is how to use machine vision technology to detect foreign items on...

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Conductive Co-based metal organic framework nanostructures for excellent potassium- and lithium-ion storage: Kinetics and mechanism studies

Mao, Pengcheng (author), Fan, Huilin (author), Liu, Chang (author), Lan, Gongxu (author), Huang, Wei (author), Li, Zhipeng (author), Amin Hassan, H.M. (author), Zheng, Runguo (author), Wang, Zhiyuan (author), Sun, Hongyu (author), Liu, Yanguo (author)

Thanks to the low cost and earth's abundant potassium resources, potassium ion batteries (PIBs) have attracted much interest as alternative energy storage devices. However, there is still a great challenge to develop suitable anode materials for PIBs with high specific capacity, fast charge/discharge and stable ion storage. Nowadays,...

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A Biocatalytic Platform for the Synthesis of Enantiopure Propargylic Alcohols and Amines

Sang, Xianke (author), Tong, Feifei (author), Zeng, Zhigang (author), Wu, Minghu (author), Yuan, Bo (author), Sun, Zhoutong (author), Sheng, Xiang (author), Hollmann, F. (author), Zhang, W. (author)

Propargylic alcohols and amines are versatile building blocks in organic synthesis. We demonstrate a straightforward enzymatic cascade to synthesize enantiomerically pure propargylic alcohols and amines from readily available racemic starting materials. In the first step, the peroxygenase from Agrocybe aegerita converted the racemic...

journal article 2022

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Thickness-Independent Capacitive Performance of Holey Ti₃C₂T_x Film Prepared through a Mild Oxidation Strategy

Guo, R. (author), Yuan, Peng (author), Han, Xiying (author), He, Xuexia (author), Lu, Jiangbo (author), Li, Qi (author), Dang, Liqin (author), Sun, Jie (author), Liu, Zonghuai (author), Lei, Zhibin (author)

The Ti₃C₂T_x film with metallic conductivity and high pseudo-capacitance holds profound promise in flexible high-rate supercapacitors. However, the restacking of Ti₃C₂T_x sheets hinders ion access to thick film electrodes. Herein, a mild yet green route has been developed to...

journal article 2022

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A parameter identification technique for traffic speed deflectometer tests of pavements

Sun, Z. (author), Kasbergen, C. (author), van Dalen, K.N. (author), Anupam, K. (author), Scarpas, Athanasios (author), Erkens, S. (author)

The structural evaluation of existing pavements forms the basis for formulating cost-effective maintenance and rehabilitation strategies. A promising tool for pavement structural evaluation at network level is the Traffic Speed Deflectometer (TSD) test. However, the application of the TSD test is hindered by the lack of a robust and efficient...

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Future perspectives for alkali‐activated materials: from existing standards to structural applications

Rossi, Laura (author), Miranda de Lima Junior, L.C. (author), Sun, Yubo (author), Dehn, Frank (author), Provis, John L. (author), Ye, G. (author), De Schutter, Geert (author)

The production of cement and concrete contributes significantly to global greenhouse gas emissions. Alkali‐activated concretes (AACs) are a family of existing alternative construction materials that could reduce the current environmental impact of Portland cement (PC) production and utilisation. Successful applications of AACs can be found in...

journal article 2022

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Resilience-based approach to maintenance asset and operational cost planning

Sun, Hao (author), Yang, M. (author), Wang, Haiqing (author)

Reliability-based and risk-based methods for directing maintenance activities play a critical role in ensuring system safety and reducing unnecessary downtime. Those methods focus on preventive maintenance to avoid component failures and are applicable before unexpected disruptions occur. However, when disruptions are unavoidable, more attention...

journal article 2022

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A human-centric machine learning based personalized route choice prediction in navigation systems

Sun, Bingrong (author), Gong, Lin (author), Shim, J. (author), Jang, Kitae (author), Park, B. Brian (author), Wang, Hongning (author), Hu, Jia (author)

Real-world route navigation data indicate that nontrivial portion of drivers do not prefer the system-recommended best routes. Current navigation systems have simplified assumptions about drivers’ route choice preferences and do not adequately accommodate drivers’ heterogeneous route choice preferences, mainly because of: (i) difficulty in...

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Template-free preparation of porous Co microfibers from spent lithium-ion batteries as a promising microwave absorber

Wu, Xiao Min (author), Xie, Fei (author), Yao, Yong Lin (author), Sun, Yue (author), Hua, Zhong Sheng (author), Zhao, Zhuo (author), Yang, Y. (author)

In order to take full advantage of the secondary resources, in this paper, we reported a template-free process to prepare porous Co microfibers from spent lithium-ion batteries (LIBs). First, the waste LiCoO₂ powders were leached by oxalic acid at a suitable temperature, and rod-like cobalt oxalate powders were obtained. Second,...

journal article 2022

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Vision-Based Nonlinear Incremental Control for A Morphing Wing with Mechanical Imperfections

Sun, B. (author), Mkhoyan, T. (author), van Kampen, E. (author), De Breuker, R. (author), Wang, Xuerui (author)

Morphing structures have acquired much attention in the aerospace community because they enable an aircraft to actively adapt its shape during flight, leading to fewer emissions and fuel consumption. Researchers have designed, manufactured, and tested a morphing wing named SmartX-Alpha, which can actively alleviate loads while achieving the...

journal article 2022

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A virtual experiment for measuring system resilience: a case of chemical process systems

Sun, H. (author), Yang, M. (author), Wang, Haiqing (author)

Resilience is an emergent property of a system, which changes with various internal and external factors. Resilience is also a hidden property of a system that cannot be observed. Thus, experiments should be performed for a given system to measure its resilience. However, physical experiments are practically impossible. Inspired by the tensile...

journal article 2022

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Risk assessment methods of cascade reservoir dams: a review and reflection

Wang, Te (author), Li, Zongkun (author), Ge, W. (author), Zhang, Yadong (author), Jiao, Yutie (author), Zhang, Hua (author), Sun, Heqiang (author), van Gelder, P.H.A.J.M. (author)

Risk assessment of cascade reservoir dams is not only the key to ensure the safety of the basin, but also the objective requirement of dam risk management. Based on the development status of cascade reservoirs in China, the complexity of dam risk management of cascade reservoirs compared with a single reservoir was analyzed. By reviewing the...

journal article 2022

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On the Estimation of Vector Wind Profiles Using Aircraft-Derived Data and Gaussian Process Regression

Marinescu, Marius (author), Olivares, Alberto (author), Staffetti, Ernesto (author), Sun, Junzi (author)

This work addresses the problem of vertical wind profile online estimation at a given location. Specifically, the north and east components of the wind are continuously estimated as functions of time and altitude at two waypoints used for landing on the Adolfo Suarez Madrid-Barajas airport. A continuous nowcast of the wind profile is...

journal article 2022