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8. Unveiling the role of chemical pressure on antiferroelectricity in NaNbO3-based antiferroelectric ceramics.

Author

Luo, Gengguang, Yang, Kaihua, Fu, Xinyang, Ma, Li, Che, Zhiyi, Chen, Xiyong, Cen, Zhenyong, Feng, Qin, and Luo, Nengneng

Subjects
*ANTIFERROELECTRICITY, *X-ray powder diffraction, *PHASE transitions, *RIETVELD refinement, *CRYSTAL lattices, *FERROELECTRIC ceramics, *HYSTERESIS
Abstract

Chemical pressure is widely applied to antiferroelectrics (AFEs) as a criterion to enhance their antiferroelectricity. However, NaNbO3 (NN)-based ceramic with well-defined double polarization hysteresis (P–E) loops was rarely reported based on this strategy, and the effect of chemical pressure on antiferroelectricity remains to be understood. In this work, the Me cations (Me is Ti, Sn, Zr) with different ionic radii were introduced into the component system 0.76NaNbO3–0.20AgNbO3–0.04CaMeO3 to tune the negative chemical pressure and investigate its effect on antiferroelectricity. The enhancement of negative chemical pressure can effectively stabilize the AFE phase and reduce hysteresis, as revealed by the P–E loops and dielectric properties, which is further confirmed by the change in crystal lattice parameters and in situ Raman spectra. Rietveld refinement of x-ray powder diffraction reveals that the enhanced negative chemical pressure mainly reduces the cation off-centering displacement and [BO6] octahedral tilting angles. As a result, the 0.76NaNbO3–0.20AgNbO3–0.04CaZrO3 exhibits good reversibility of the electric field-induced antiferroelectric–ferroelectric phase transition and well-defined double P–E loops. This work reveals the underlying mechanism of chemical pressure and provides an effective way of discovering new NN-based AFEs. [ABSTRACT FROM AUTHOR]

Published
2023
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9. Research on the Identification of Rock Mass Structural Planes and Extraction of Dominant Orientations Based on 3D Point Cloud.

Author

Zhu, Jiarui, Xia, Yonghua, Wang, Bin, Yang, Ziliang, and Yang, Kaihua

Subjects
HOUGH transforms, ROCK slopes, ENGINEERING standards, POINT cloud, ROCK analysis
Abstract

The different spatial distribution forms of rock mass structural planes create weak zones in the rock mass, which is also a key factor in controlling rock mass stability. Accurately and efficiently identifying rock mass structural planes and obtaining their dominant orientations is critical for rock mass engineering design and construction. Traditional surveying methods for high and steep rock mass structural planes pose high safety risks, offer limited data, and make comprehensive statistical analysis difficult. This paper utilizes complex rock mass surface 3D point cloud data obtained through 3D laser scanning technology and uses the Hough space transform method to calculate the normal vectors of the 3D point cloud. Based on the difference in normal vectors and surface variation, region growing segmentation is applied to identify and extract rock mass structural planes. Additionally, the fast search and density peak clustering method (CFSFDP) is used for clustering analysis of the rock mass structural planes to obtain dominant orientations. This method was applied to a highway's high and steep rock slope, successfully identifying 281 structural planes and two sets of dominant structural planes. The orientation of the dominant structural planes identified through RocScience Dips 7.0 analysis showed a deviation of no more than ±3°, complying with engineering standards. The research results offer a feasible solution for the identification of high and steep rock mass structural planes and the extraction of the orientation of dominant structural planes. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Shaping of Molecular Weight Distribution Using Self-Optimizing Control Based on Moments

Author

Su, Hongxin, Zhou, Chenchen, Tang, Xinhui, Cao, Yi, Pan, Fanda, Yang, Kaihua, and Yang, Shuang-Hua

Abstract

It is important but also challenging to control the full shape of the molecular weight distribution in polymerization processes, since it is an infinite dimensional probability density function (PDF). In this work, a self-optimizing control (SOC) strategy is adopted to achieve the aim of PDF shaping by maintaining some elaborately selected controlled variables (CVs) at constant set points through online feedback control, even in the presence of uncertainties. To find optimal CVs, finite moments rather than the full shape, which corresponds to an infinite-dimensional space, of the PDF are adopted as elements to parametrize CVs, while the optimization problem is to minimize the distance between the actual PDF and the target PDF. The proposed SOC-PDF method is demonstrated more effective than the existing stochastic distribution control method through a pilot semibatch styrene polymerization case study.

Published
2024
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17. Drilling Fluids and Solids Control Technology

Author

Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, Wang, Yongping, Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, and Wang, Yongping

Published
2015
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18. Well-Deviation Control Techniques for Strong Dipping Strata

Author

Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, Wang, Yongping, Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, and Wang, Yongping

Published
2015
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19. Technical Economical Analysis

Author

Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, Wang, Yongping, Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, and Wang, Yongping

Published
2015
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20. Reaming Drilling Techniques of Hard Crystalline Rock

Author

Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, Wang, Yongping, Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, and Wang, Yongping

Published
2015
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21. Diamond Core Drill Bit

Author

Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, Wang, Yongping, Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, and Wang, Yongping

Published
2015
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22. Hard Rock Deep Well Core Drilling Techniques

Author

Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, Wang, Yongping, Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, and Wang, Yongping

Published
2015
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23. Construction Situation

Author

Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, Wang, Yongping, Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, and Wang, Yongping

Published
2015
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24. Drilling Engineering Design

Author

Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, Wang, Yongping, Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, and Wang, Yongping

Published
2015
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25. Well Site and Drilling Equipment

Author

Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, Wang, Yongping, Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, and Wang, Yongping

Published
2015
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26. Background

Author

Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, Wang, Yongping, Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, and Wang, Yongping

Published
2015
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27. Drilling Data Acquisition

Author

Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, Wang, Yongping, Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, and Wang, Yongping

Published
2015
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28. Casing and Well Cementation

Author

Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, Wang, Yongping, Wang, Da, Zhang, Wei, Zhang, Xiaoxi, Zhao, Guolong, Zuo, Ruqiang, Ni, Jialu, Yang, Gansheng, Jia, Jun, Yang, Kaihua, Zhu, Yongyi, Xie, Wenwei, Zhu, Wenjian, Zhang, Peifeng, Fan, Lasheng, Ye, Jianliang, and Wang, Yongping

Published
2015
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44. Enhanced comprehensive energy storage properties in NaNbO3-based relaxor antiferroelectric via MnO2 modification.

Author

Luo, Gengguang, Zhuang, Dongyang, Yang, Kaihua, Ma, Li, Che, Zhiyi, Xu, Chao, Cen, Zhenyong Y., Chen, Xiyong, Feng, Qin, and Luo, Nengneng N.

Abstract

The MnO2 is generally used as a sintering aid to improve sintering quality and breakdown electric field of ceramic capacitors, however, few studies were conducted to provide a guidance for the appropriate amount of MnO2 additive that should be added. In this work, various contents of MnO2 were added into 0.84NaNbO3-0.16CaTiO3 to systematically study its effect. The phase structure, dielectric behavior, microstructure, and so forth demonstrate that an appropriate MnO2 additive can stabilize antiferroelectric phase, optimize microstructure, and increase breakdown electric field. The 1.5 mol% MnO2 doped sample exhibits excellent comprehensive energy storage performance with an ultrahigh recoverable energy storage density of 5.8 J/cm3, good efficiency of 81%, splendid frequency and temperature stabilities, and outstanding charge-discharge properties. This work provides a promising energy storage material and a design concept based on MnO2 modification, which will contribute to the development and application of NN-based dielectric materials. [ABSTRACT FROM AUTHOR]

Published
2023
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50. The China Continental Scientific Drilling Project

Author

Wang, Da, primary, Zhang, Wei, additional, Zhang, Xiaoxi, additional, Zhao, Guolong, additional, Zuo, Ruqiang, additional, Ni, Jialu, additional, Yang, Gansheng, additional, Jia, Jun, additional, Yang, Kaihua, additional, Zhu, Yongyi, additional, Xie, Wenwei, additional, Zhu, Wenjian, additional, Zhang, Peifeng, additional, Fan, Lasheng, additional, Ye, Jianliang, additional, and Wang, Yongping, additional

Published
2015
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