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Paraelectric Doping Simultaneously Improves the Field Frequency Adaptability and Dielectric Properties of Ferroelectric Materials: A Phase-Field Study

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Computers, Materials and Continua 2024年第1期81卷 213-228页

作者： Wang z. Cao J. liu z. z.ao Y. School of Materials Science and Engineering Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-Performance Al/Mg Alloy Materials North University of China Taiyuan 030051 China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Beijing 100083 China Institute of Materials Intelligent Technology Liaoning Academy of Materials Shenyang 110004 China

Recent years, the polariz.tion response of ferroelectrics has been entirely studied. However, it is found that the polariz.tion may disappear gradually with the continually applied of electric field. In this paper, taking K0.48Na0.52NbO3(KNN) as an example, it was demonstrated that the residual polariz.tion began to decrease when the electric field frequency increased to a certain extent using a phase-field methods. The results showed that the content of out-of-plane domains increased first and then decreased with the increase of applied electric field frequency, the maximum polariz.tion disappeared at high frequencies, and the hysteresis loop became elliptical. In order to further study the abnormal changes of hysteresis loops of ferroelectrics under high electric field frequency, we analyz.d the hysteresis loop and dielectric response of solid solution 0.1SrTiO3-0.9K0.48Na0.52NbO3. It was found that the doped hysteresis loop maintained its shape at higher frequency and the dielectric constant increased. This kind of doping has a higher field frequency adaptability, which has a key guiding role in improving the dielectric properties of ferroelectric thin films and expanding the frequency application range of ferroelectric nano memory. © 2024 The Authors. Published by Tech Science Press.

关键词： dielectric properties doping electric field frequency Ferroelectric ceramics phase field method

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NEW VIEW ABOUT BAINITIC TRANSFORMATION IN STEEL

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Acta Metallurgica Sinica(English Letters) 1999年第3期12卷 229-234页

作者： liu, C.C. liu, z. Chen, G.X. Tsinghua Univ Beijing China

The bainitic transformation was analyz.d according to the factors such as morphology, crystallography, mechanical property of bainite and transformation kinetics. It was found that the bainitic transformation is controlled by displacive mechanism and self-tempering of displacive microstructure, i.e. bainite is the product of such procedure during which undercooled austenite first transforms into one certain displacive microstructure by displacive mechanism and then this microstructure experiences self-tempering. With this idea, several questions that can not be illustrated only by displacive transformation mechanism can be explained successfully.

关键词： Bainite Morphology Steel

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LOW CYCLE FATIGUE BEHAVIOR OF Az.1HP ALLOY IN AS HIGHP RESSURE DIE CASTING

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Acta Metallurgica Sinica(English Letters) 2000年第4期13卷 961-966页

作者： liu, z. Xu, Y.Y. Wang, z.G. Wang, Y. liu, z.Y. Inst of Metal Research Chinese Acad of Sciences Shenyang China

Fully reversed total strain-controlled low-cycle fatigue tests were conducted at room temperature in air to study the fatigue behavior of Az.1HP magnesium alloy in as high pressure die casting and subsequently heat treatment. All the specimens in different heat histories exhibit cyclic strain hardening in different degrees. It is difficult to distinguish the fatigue behavior of the die casting specimens from that of the solution aging specimens. The solution treated specimens show longer fatigue life at high strain amplitude and shorter fatigue life at low strain amplitude than the die casting and solution aging specimens though they have the lowest yield strength with higher strain hardening. Fatigue fracture surfaces for strain amplitude larger than 0.005 show very similar to those found by monotonic tensile tests. The SEM examination reveals that the regions of fatigue crack growth and final fracture can be characteriz.d by quasi-cleavage mechanisms, but some shallow dimples, slip bands and secondary cracks are found on the fracture surface in the fracture crack growth areas.

关键词： Cracks Die casting Fatigue of materials Heat treatment

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Characteristic Polynomial Assignment in 2-D System

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Journal of Systems Engineering and Electronics 2001年第3期12卷 57-63页

作者： liu, z. z.ao, S. Tang, W. Li, G. Tianjin University Tianjin 300072 China

The closed loop polynomial assignment problems of 2D systems Roesser model with multiple inputs were studied. The problems were transferred to a rational map and were assigned a sate feedback and output feedback. Suff... 详细信息

关键词： Computational complexity Computational geometry Image processing Kalman filtering Mathematical models Matrix algebra Polynomials State feedback

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Types　and　characters　of　sub-bottom　acoustic　reflection　in　eastern　part　of　Bohai　Sea

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Acta Oceanologica Sinica 1997年第2期16卷 225-237页

作者： Wang K. liu z. Xia D. First Institute of Oceanography State Oceanic Administration Qingdao 266003 China

Ｈｉｇｈ－ｒｅｓｏｌｕｔｉｏｎｓｕｂ－ｂｏｔｔｏｍｐｒｏｆｉｌｅｒｈａｓｒｅｖｅｄｅｄｓｅｄｉｍｅｎｔａｌｓｔｒａｔａａｎｄｅｎｔｉｒｏｎｍｅｎｔｓｉｎｔｈｅｅｕｔｔｍｐ．ｏｆｔｈｅｌ３ｏｈａｉＳｅａｓｉｎｃｅｔｈｅ... 详细信息

Ｈｉｇｈ－ｒｅｓｏｌｕｔｉｏｎｓｕｂ－ｂｏｔｔｏｍｐｒｏｆｉｌｅｒｈａｓｒｅｖｅｄｅｄｓｅｄｉｍｅｎｔａｌｓｔｒａｔａａｎｄｅｎｔｉｒｏｎｍｅｎｔｓｉｎｔｈｅｅｕｔｔｍｐ．ｏｆｔｈｅｌ３ｏｈａｉＳｅａｓｉｎｃｅｔｈｅｌｔａｔｅＰｌｅｉｓｔｏｃｅｎｅ．Ａｔｃｃｏｒｄｉｎｇｔｏｔｈｅｃｈａｒａｃｔｅｒｓｏｆａｃａｕｓｅｉｃｒｅｆｌｅｃｔｉｏｎａｎｄｓｅｉｓｍｉｃｔｓｔｒａｔｔｌｇｍｐｈｉｃｐｒｉｎｃｉ－ｐｌｅ，ｓｏｍｅｃｌｔ．ｉｆｉｃａｔｉｏｎｏｆｔｙｐｉｃａｌａｃｏｕｓｔｉｃｒｅｆｌｅｃｔｉｏｎｉｓｎｚａｄｅｏｕｔｔｎｄｗｉＵｂｅｆａｖｏｕｒａｂｌｅｆｏｒｉｎｔｅｒｐｒｅｔａｔｉｏｎａｎｄｒｅｃｏｇｎｂａｔｉｏｎｏｆａｏｏｕｓｔｉｃｐｒｏｆｉｌｅｓｉｎｔｈｉｓａｒｅａ

关键词： characters sub-bottom acoustic and Bohai

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Corrigendum to Integrating pathomics with radiomics and genomics for cancer prognosis:A brief review

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Chinese Journal of Cancer Research 2021年第6期33卷 724-724页

作者： liu, z. Guangdong Acad Med Sci Guangdong Prov Peoples Hosp Dept Radiol Guangzhou 510080 Peoples R China

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Research on Fine-Grained RecognitionMethod for Sensitive Information in Social Networks Based on CLIP

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Computers, Materials and Continua 2024年第1期81卷 1565-1580页

作者： z.ang M. Shan F. liu M. Wang z. School of Computer Science Zhongyuan University of Technology Zhengzhou 450007 China Henan Key Laboratory of Cyberspace Situation Awareness Zhengzhou 450001 China

With the emergence and development of social networks, people can stay in touch with friends, family, and colleaguesmore quickly and conveniently, regardless of their location. This ubiquitous digital internet environment has also ledtolarge-scaledisclosureof personal *** tothe complexity andsubtletyof sensitive information, traditional sensitive information identification technologies cannot thoroughly address the characteristics of each piece of data, thus weakening the deep connections between text and images. In this context, this paper adopts the CLIP model as a modality discriminator. By using comparative learning between sensitive image descriptions and images, the similarity between the images and the sensitive descriptions is obtained to determine whether the images contain sensitive information. This provides the basis for identifying sensitive information using different modalities. Specifically, if the original data does not contain sensitive information, only single-modality text-sensitive information identification is performed; if the original data contains sensitive information, multimodality sensitive information identification is conducted. This approach allows for differentiated processing of each piece of data, thereby achieving more accurate sensitive information identification. The aforementioned modality discriminator can address the limitations of existing sensitive information identification technologies, making the identification of sensitive information from the original data more appropriate and precise. © 2024 The Authors. Published by Tech Science Press.

关键词： Deep learning multi-modal fusion sensitive information recognition social networks

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Study of factors influencing dose distribution of brachytherapy in cervical cancer

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Journal of Pharmaceutical Analysis 2008年第2期20卷 125-127页

作者： liu z. Gao Y. Luo W. Wang G. Wang R. z.eng W. liu R. Gynecology Department of Tumor Center First Affiliated Hospital Medical School of Xi'an Jiaotong University Xi'an 710061 China

Objective To study the factors which influence the dose distribution of brachytherapy in cervical *** Ninety-five patients with cervical cancer Ⅱ-Ⅲb received fundamental radiation therapy including brachytherapy in our department from Aug.2004 to *** deviation of isodose curve of brachytherapy was based on A-B reference system,and the deviation of dose was defined by measuring in a practical standard body *** The factors influencing isodose offset significantly were parametrial...

关键词： Cervical neoplasm Dosimetry Intracavity irradiation Radiotherapy

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Tidal　bedforms　in　eastern　part　of　the　Bohai　Sea

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Acta Oceanologica Sinica 1998年第2期17卷 209-231页

作者： liu z. Berne S. Wang K. Marsset T. Xia D. Tang Y. Bourillet J.F. First Institute of Oceanography State Oceanic Administration Qingdao 266003 China IFREMER Centre de Brest BP 70 29280 Plouzane France

ＴｉｄａｌｂｅｄｆｏｒｍｓｉｎｅａｓｔｅｒｎｐａｒｔｏｆｔｈｅＢｏｈａｉＳｅａＬｉｕＺｈｅｎｘｉａ，Ｓ．Ｂｅｒｎｅ，ＷａｎｇＫｕｉｙａｎｇ，Ｔ．Ｍａｒｓｓｅｔ，ＸｉａＤｏｎｇｘｉｎｇ，ＴａｎｇＹｕｘｉａｎｇ，Ｊ．Ｆ．... 详细信息

ＴｉｄａｌｂｅｄｆｏｒｍｓｉｎｅａｓｔｅｒｎｐａｒｔｏｆｔｈｅＢｏｈａｉＳｅａＬｉｕＺｈｅｎｘｉａ，Ｓ．Ｂｅｒｎｅ，ＷａｎｇＫｕｉｙａｎｇ，Ｔ．Ｍａｒｓｓｅｔ，ＸｉａＤｏｎｇｘｉｎｇ，ＴａｎｇＹｕｘｉａｎｇ，Ｊ．Ｆ．Ｂｏｕｒｉｌｌｅｔ（Ｒｅｃｅｉｖｅ...

关键词： part the Bohai

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低维材料非线性光学与器件专题编者按

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物理学报 2020年第18期69卷 1-1页

作者： z.ang z. z.ang T. liu z. Ding D. Shi B.

2004年,石墨烯的首次发现为具有独特光子和光电特性的二维材料的发展打开了大门.二维材料通常被称为原子薄层材料,其厚度可减至单层或几层.强的层内共价和弱的层间范德瓦耳斯力是二维材料的典型特征.不同厚度和电子结构的二维材料使其... 详细信息

2004年,石墨烯的首次发现为具有独特光子和光电特性的二维材料的发展打开了大门.二维材料通常被称为原子薄层材料,其厚度可减至单层或几层.强的层内共价和弱的层间范德瓦耳斯力是二维材料的典型特征.不同厚度和电子结构的二维材料使其可以在紫外到太赫兹的波长范围内进行光学响应,极大地扩展了二维材料在光子学领域的应用范围.

关键词：范德瓦耳斯力薄层材料二维材料非线性光学光学响应低维材料光子学波长范围

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