Searched for: author%3A%22Chen%2C+Z.%22
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Vasileiadis, A. (author), Zhou, Q. (author), Lu, Yaxiang (author), Li, Y. (author), Ombrini, P. (author), Chen, Z. (author), van der Jagt, R. (author), Ganapathy, S. (author), Wagemaker, M. (author)
Correction to: Nature Energy, published online 3 January 2024. In the version of this article initially published, lithium (green, “Li”) and sodium (purple, “Na”) color key labels in Fig. 3a,d,e were interchanged and are now amended in the HTML and PDF versions of the article.
journal article 2024
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Ranjan, R. (author), Chen, Z. (author), Ayas, C. (author), Langelaar, Matthijs (author), van Keulen, A. (author)
Overheating is a major issue especially in metal Additive Manufacturing (AM) processes, leading to poor surface quality, lack of dimensional precision, inferior performance and/or build failures. A 3D density-based topology optimization (TO) method is presented which addresses the issue of local overheating during metal AM. This is achieved...
journal article 2023
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Chen, Z. (author), Lin, Zhongwei (author), Zhai, Xiaoya (author), Liu, Jizhen (author)
A challenging topic arising in dynamic wind turbine wake is modeling, especially the low-order approximation. The central problem is the fact that it has high-dimensional and nonlinear wake characteristics. In this paper, a Koopman-linear flow estimator is designed according to the Koopman operator theory. Different from the conventional flow...
journal article 2022
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Chen, Z. (author), Ledoux, H. (author), Khademi, S. (author), Nan, L. (author)
While three-dimensional (3D) building models play an increasingly pivotal role in many real-world applications, obtaining a compact representation of buildings remains an open problem. In this paper, we present a novel framework for reconstructing compact, watertight, polygonal building models from point clouds. Our framework comprises three...
journal article 2022
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Wang, Ye (author), Ren, Genkuan (author), Jiang, Bing (author), Yang, Lin (author), Zhang, Zhiye (author), Wang, Xinlong (author), Zhong, Yanjun (author), Chen, Z. (author), Yang, Xiushan (author), Morita, Kazuki (author), Ma, Wenhui (author)
Nanometer-sized hematite was prepared via a two-step process. In the first step, FeSO<sub>4</sub>·7H<sub>2</sub>O was oxidized to Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> by oxygen in an acidic solution. In the second step, the Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> was reduced to nanosize hematite with sulfur vapor at 550 °C. The...
journal article 2022
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Lumban-Gaol, Y. A. (author), Chen, Z. (author), Smit, M. (author), Li, X. (author), Erbaşu, M. A. (author), Verbree, E. (author), Balado Frías, J. (author), Meijers, B.M. (author), van der Vaart, C.G. (author)
Point cloud data have rich semantic representations and can benefit various applications towards a digital twin. However, they are unordered and anisotropically distributed, thus being unsuitable for a typical Convolutional Neural Networks (CNN) to handle. With the advance of deep learning, several neural networks claim to have solved the...
journal article 2021
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Hu, R. (author), Ferrari, Riccardo M.G. (author), Chen, Z. (author), Cheng, Yuqiang (author), Zhu, Xiaobin (author), Cui, Xing (author), Wu, Jianjun (author)
This paper proposes a controller design for the electric pump of a deep-throttling rocket engine. The nonlinearity of the system is taken into consideration by analyzing the gap metric. Then, proportional-integral-derivative controller and gain-scheduling linear quadratic regulator are designed. Analyzing the amplitude- and phase-frequency...
journal article 2021
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Chen, Z. (author), Zeilstra, Christiaan (author), van der Stel, Jan (author), Sietsma, J. (author), Yang, Y. (author)
In order to understand the pre-reduction behaviour of fine hematite particles in the HIsarna process, change of morphology, phase and crystallography during the reduction were investigated in the high temperature drop tube furnace. Polycrystalline magnetite shell formed within 200 ms during the reduction. The grain size of the magnetite is in...
journal article 2021
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Chen, Z. (author), Zeilstra, Christiaan (author), van der Stel, Jan (author), Sietsma, J. (author), Yang, Y. (author)
Suspension reduction kinetics of hematite ore particles at 1710 K to 1785 K was described by the Johnson-Mehl-Avrami-Kolmogorov model with Avrami exponent of 1.405. The apparent activation energy is 105.5 kJ mol<sup>−1</sup> with the rate determining step of nucleation and growth. The reduction degree of the hematite at the endpoint is a...
journal article 2021
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Chen, Z. (author)
This thesis describes low-power application-specific integrated circuit (ASIC) designs to mitigate the constraint of cable count in miniature 3-D TEE probes. Receive cable count reduction techniques including subarray beamforming and digital time-division multiplexing (TDM) have been explored and the effectiveness of these techniques has been...
doctoral thesis 2020
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Zhang, Hua (author), Yu, Li (author), Liu, Tao (author), Ni, Hongwei (author), Li, Y. (author), Chen, Z. (author), Yang, Y. (author)
Decreasing the preheating temperature is an effective step to control the energy consumption in the hot rolling process. In order to obtain the lowest preheating temperature to prepare enough thickness of oxide scale in the hot rolling process, the oxidation resistance of commercial steel samples with different Al and Si contents were...
journal article 2020
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Chen, Z. (author), Soozande, M. (author), Vos, H.J. (author), Bosch, J.G. (author), Verweij, M.D. (author), de Jong, N. (author), Pertijs, M.A.P. (author)
This article quantitatively analyzes the impact of bit errors in digitized RF data on ultrasound image quality. The quality of B-mode images in both linear array and phased array imaging is evaluated by means of three objective image quality metrics: peak signal-to-noise ratio, structural similarity index, and contrast-to-noise ratio, when...
journal article 2020
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Chen, Z. (author), Zeilstra, Christiaan (author), van der Stel, Jan (author), Sietsma, J. (author), Yang, Y. (author)
In order to understand the thermal decomposition kinetics of hematite particles in inert atmosphere, thermogravimetriy was employed for isoconversional analysis. The kinetic triplet was estimated from the experimental data and the isothermal reaction kinetics was predicted. The results indicated that the thermal decomposition could be divided...
journal article 2020
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Wang, X. (author), Wu, Chaozhong (author), Xue, J. (author), Chen, Z. (author)
To date, automatic driving technology has become a hotspot in academia. It is necessary to provide a personalization of automatic driving decision for each passenger. The purpose of this paper is to propose a self-learning method for personalized driving decisions. First, collect and analyze driving data from different drivers to set learning...
journal article 2020
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Han, Zike (author), Gao, Jianqiu (author), Yuan, Xizhi (author), Zhong, Yanjun (author), Ma, Xiaodong (author), Chen, Z. (author), Luo, Dongmei (author), Wang, Ye (author)
For both the waste treatment of large quantities of blast furnace (BF) slag and carbon dioxide (CO<sub>2</sub>) that are discharged in ironworks, mineral carbonation by BF slag was proposed in this decade. However, it has not been widely used due to its high energy consumption and low production efficiency. In this study, a microwave roasting...
journal article 2020
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Chen, Z. (author), Zeilstra, Christiaan (author), van der Stel, Jan (author), Sietsma, J. (author), Yang, Y. (author)
High-temperature reduction processes of iron oxide particles suspension are promising in carbon emission abatement. Recently, researchers have contributed abundant knowledge of the reaction mechanism and kinetics of iron oxide particles above 1473 K, while there was very limited information 10 years ago. Although the understanding of the high...
review 2020
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Chen, Z. (author), Wang, Li jun (author), Du, Xiao jia (author), Sun, Zai hong (author), Li, Fu shen (author), Chou, Kuo Chih (author)
A commercial solid oxide fuel cell with a Ni/YSZ anode was characterized under a pure methane atmosphere. The amount of deposited carbon increased with an increase in temperature but decreased when the temperature exceeded 700°C. The reactivity of carbon decreased with increasing deposition temperature. Filamentous carbon was deposited from...
journal article 2019
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Chen, Z. (author), Qu, Ying xia (author), Zeilstra, Christiaan (author), Van Der Stel, Jan (author), Sietsma, J. (author), Yang, Y. (author)
HIsarna is a promising ironmaking technology to reduce CO <sub>2</sub> emission. Information of phase transformation is essential for reaction analysis of the cyclone reactor of the HIsarna process. In addition, data of density and volume of the ore particles are necessary for estimation of the residence time of the particles in the cyclone...
journal article 2019
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Bera, D. (author), Raghunathan, S.B. (author), Chen, C. (author), Chen, Z. (author), Pertijs, M.A.P. (author), Verweij, M.D. (author), Daeichin, V. (author), Vos, H.J. (author), van der Steen, A.F.W. (author), de Jong, N. (author), Bosch, J.G. (author)
Until now, no matrix transducer has been realized for 3D transesophageal echocardiography (TEE) in pediatric patients. In 3D TEE with a matrix transducer, the biggest challenges are to connect a large number of elements to a standard ultrasound system, and to achieve a high volume rate (&gt;200 Hz). To address these issues, we have recently...
journal article 2018
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Tan, M. (author), Chen, C. (author), Chen, Z. (author), Janjic, Jovana (author), Daeichin, V. (author), Chang, Z.Y. (author), Noothout, E.C. (author), van Soest, G. (author), Verweij, M.D. (author), de Jong, N. (author), Pertijs, M.A.P. (author)
This paper presents an area- and power-efficient application-specified integrated circuit (ASIC) for 3-D forward-looking intravascular ultrasound imaging. The ASIC is intended to be mounted at the tip of a catheter, and has a circular active area with a diameter of 1.5 mm on the top of which a 2-D array of piezoelectric transducer elements is...
journal article 2018
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