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Zhang Chuan,Cui Liwen,Shen Meng,Yadav Vivek,Zhong Haixia,Zhang Fuchun,Zhou Xiaoming,Wu Xinyu 한국원예학회 2024 Horticulture, Environment, and Biotechnology Vol.65 No.2
Grape berries often crack near the proximal end, which may be related to water absorption and their cellular anatomical structure. To study the relationship between water absorption, cell anatomical structures, and berry cracking near the proxi mal end, 49 varieties were selected. Eighteen were prone to cracking near the proximal end, while 31 were resistant. An in vitro soaking experiment on ripe berries measured the diff erence in berry-cracking degrees among diff erent varieties. In vitro staining was used to trace water absorption and paraffi n sections were prepared to observe and analyze the struc tural parameters of diff erent tissues. Results showed that the cracking rate and water uptake of the crack-prone berries were signifi cantly higher than those of the crack-resistant berries. Fruit prone to cracking was characterized by a thinner cuticle, epidermis, and sub-epidermis. After staining, it was found that dye absorption was limited to the berry near the proximal end. Other cell size parameters may also lead to cracking near the proximal end. By tracing water transport and analyzing diff erences in cell structure characteristics among varieties, we speculated that the vascular bundle xylem water transport repression and diff erences in cell anatomical structures may have led to berry cracking near the proximal end. The reasons for berry cracking near the proximal end were preliminarily explained, providing theoretical support for further screening of crack-resistant varieties.
Zhang Xiao,Tao Ran,Xu Xiaoming,Wang Tingjie,Zhang Hui 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6
Finite control set-model predictive control (FCS-MPC) has become a hotspot for power electronics applications and research in recent years due to its conceptual simplicity, ease of handling system constraints and excellent multivariable control capability. However, the traditional FCS-MPC vector selection direction is more fi xed and the steady-state performance of the system is poor, while the speed outer loop uses PI control and the speed regulation eff ect is easily infl uenced by the motor parameters and cannot solve the problem of fast and overshoot free at the same time. To address these problems, a threelevel two-vector model predictive current control method for permanent magnet synchronous motors is proposed based on a self-anti-disturbance technique. For the speed outer loop, a fi rst-order linear active disturbance rejection control is used instead of the traditional PI control, which solves the problem of overshooting and speed incompatibility and improves the robustness of the system; for the current inner loop, the idea of dual-vector model prediction is introduced to expand the selection range of the voltage vector, making the selection of the voltage vector more accurate, while a vector partitioning strategy is used to reduce the computational burden. The control system is modelled and simulated using MATLAB/Simulink. Simulation and test results show that the method has good parameter robustness, fast dynamic response and satisfactory steady-state performance.
Zhang, Kan,Li, Ping,Guo, Shiying,Jeong, Jong Yeob,Jin, Bingjun,Li, Xiaoming,Zhang, Shengli,Zeng, Haibo,Park, Jong Hyeok The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.45
<P>In this paper, we precisely controlled the <I>d</I>-spacing of vertically aligned MoS2 arrays ranging from 6.2 to 10 Å <I>via</I> heating-controlled deintercalation of NH4<SUP>+</SUP> ions. The finely controllable interlayer nanoarchitecture resulted in an optimal <I>d</I>-spacing of 7.3 Å, which on nitrogenous reduced graphene oxide (N-RGO) delivered a reversible capacity of 295 mA h g<SUP>−1</SUP> after 2000 cycles at 1 A g<SUP>−1</SUP> for Na<SUP>+</SUP> intercalation.</P>
Zhang, XiaoMing,Ding, Han Techno-Press 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.26 No.2
In practical engineering, the uncertain concept plays an important role in the control problems of the vibration structures. In this paper, based on matrix perturbation theory and interval finite element method, the closed-loop vibration control system with uncertain parameters is discussed. A new method is presented to develop an algorithm to estimate the upper and lower bounds of the real parts and imaginary parts of the complex eigenvalues of vibration control systems. The results are derived in terms of physical parameters. The present method is implemented for a vibration control system of the frame structure. To show the validity and effectiveness, we compare the numerical results obtained by the present method with those obtained by the classical random perturbation.
A Method for Mapping Sensor Data to SSN Ontology
Xiaoming Zhang,Yunping Zhao,Wanming Liu 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.9
Along with the continuous development of the sensor network technology, sensors from all over the world are constantly producing sensor data. However, the sensor data from different source is hard to work together for lack of semantic. Fortunately, SSN ontology provide a way to represent sensor data semantically, but how to transform sensor data into the instance of SSN ontology conveniently is still an issue to be considered. This paper proposed a solution to map sensor data to SSN ontology automatically based on a predefined XML-based document. We design a mapping language SASML (Sensors Annotation and Semantic Mapping Language) which provide a schema to annotate sensors and sources so as to generate a XML document for mapping. Then, an algorithm (namely SDRM) is designed to automatically transform sensor data, which described by SASML, to RDF conforming to SSN ontology, according to the mapping document and the element correspondences between the SASML and SSN ontology. Further, a case study about sensor data from greenhouse is presented to illustrate our method, and a prototype is also developed to demonstrate the feasibility and effectiveness.
China`s Perceptions of and Responses to Abe`s Foreign Policy
( Xiaoming Zhang ) 경남대학교 극동문제연구소 2015 ASIAN PERSPECTIVE Vol.39 No.3
Over the past two years since Xi Jinping and Abe Shinzo came to power, the bilateral relationship between China and Japan has been deteriorating steadily. China’s perception of Abe’s foreign policy orientation has been very negative. At the same time, China’s response to it has also been very tough and assertive. At least four factors may account for China’s attitude and behavior: China’s rise, domestic politics, historical memory, and leadership personality.
STSM : An Infrastructure for Unifying Steel Knowledge and Discovering New Knowledge
Xiaoming Zhang,Pengtao Lv,Jianxia Wang 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.6
There are rich data resources in materials science, but these data resources are heterogeneous in level of system, structure, syntax, and semantics. Therefore, a domain ontology is necessary and helpful for the integration of these heterogeneous data resources, and it is also one of the main tasks of materials informatics. In this paper, we propose a steel semantic model (named STSM) based on ontology and logic rules for the representation of the steel knowledge. STSM is developed with the consideration of the features of materials data and the developed process is presented. Then, we describe the content and organization of STSM which covers the basic knowledge in steel domain. Further, domain axioms and logic rules are designed to enhance the reasoning ability of STSM. STSM is built and tested in protégé, and an experimental prototype based on Jena is also developed to demonstrate the effectiveness of STSM.