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Search Results: 1 - 10 of 59017 matches for " Shiyou Yang "
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Computation and Analysis of Propellant and Levitation Forces of a Maglev System Using FEM Coupled to External Circuit Model  [PDF]
Shiyou Yang, Lin Yang, Qiang Zhou
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.24034
Abstract: This paper studies the propellant and levitation forces of a prototype maglev system where the propellant forces are provided by a linear motor system. For this purpose, the mathematical model and method using finite element method coupled to external circuit model is developed. The details of the propellant and levitation forces for a prototype maglev system under different operating conditions are investigated, and some directions are given for practical engineering applications.
Combined Strategies Based on Matrix Pencil Method and Tabu Search Algorithm to Minimize Elements of Non-Uniform Antenna Array
Shiyou Yang;Yanhui Liu;Qing Huo Liu
PIER B , 2009, DOI: 10.2528/PIERB09092408
Abstract: The minimization of elements in a non-uniform antenna array is critical in some practical engineering applications such as satellite and mobile communications. However, due to the complexity in the synthesis of an antenna array, the available techniques are not equally successful for reducing the element number of a non-uniform antenna array with as few elements as possible with respect to both solution quality and solution efficiency. In this point of view, a combined strategy based on the matrix pencil method and tabu search algorithm is proposed with the goal of integrating the advantages of the high solution efficiency of the matrix pencil method and the strong global searching ability of the tabu search algorithm when solving an antenna array design problem. In the proposed strategies, the desired radiation pattern is firstly sampled to form a discrete pattern data set. The matrix pencil method is then employed to optimize the excitations and location distributions of the antenna array elements to reduce the element number. Finally, the excitation and location distributions of antenna array elements are (repeatedly) re-optimized by using a tabu search algorithm by starting from the solution of the matrix pencil method to efficiently find the global solution of the design problem. To make the tabu search algorithm suitable for solving antenna array designs, some innovative approaches such as the elimination of the tabu list, systematic diversification as well as intensification processes for neighborhood creations are made. Numerical examples have shown the effectiveness and advantages of the proposed combined strategies.
A Generalized Inequality for Covariance and Its Applications  [PDF]
Shiyou Lin, Yuanyuan Chen
Applied Mathematics (AM) , 2018, DOI: 10.4236/am.2018.99073
Abstract:
The research in this paper is intended as an attempt to motivate the work of Zhefei He and Mingjin Wang (An inequality for covariance with applications, 2015). More precisely, In this research we first provide a generalized inequality for covariance. And then, we present its applications to solve some problems about probability distribution. Finally, we state the conclusion and mention the relevant work in the future.
Magnetic Null-Pairs within Magnetic Reconnection Ion Diffusion Region in the Magnetotail: A Case Study  [PDF]
Shiyou Li
International Journal of Geosciences (IJG) , 2019, DOI: 10.4236/ijg.2019.1011055
Abstract: The 3-dimentional structure of magnetic reconnection ion diffusion region has been studied in this paper. Steady magnetic null-pair structure is found among the Cluster tetrahedron within a thin current sheet when magnetic reconnection takes place in the near-Earth magnetotail. Two magnetic null points in the null-pair are well coupled, with an angle of about 3~7° between the spin line of one and the fan surface of the other. The magnetic null-pair detected in the ion diffusion region, is quasi-stable in spatial structure but fast evolved in time, consistent with the fast reconnection scenario. The spatially steady magnetic null-pair within the diffusion region of the collision less fast magnetic reconnection presents an advanced understanding of the magnetic reconnection process.
A Two-Zone Multigrid Model for SI Engine Combustion Simulation Using Detailed Chemistry
Hai-Wen Ge,Harmit Juneja,Yu Shi,Shiyou Yang,Rolf D. Reitz
Journal of Combustion , 2010, DOI: 10.1155/2010/201780
Abstract: An efficient multigrid (MG) model was implemented for spark-ignited (SI) engine combustion modeling using detailed chemistry. The model is designed to be coupled with a level-set-G-equation model for flame propagation (GAMUT combustion model) for highly efficient engine simulation. The model was explored for a gasoline direct-injection SI engine with knocking combustion. The numerical results using the MG model were compared with the results of the original GAMUT combustion model. A simpler one-zone MG model was found to be unable to reproduce the results of the original GAMUT model. However, a two-zone MG model, which treats the burned and unburned regions separately, was found to provide much better accuracy and efficiency than the one-zone MG model. Without loss in accuracy, an order of magnitude speedup was achieved in terms of CPU and wall times. To reproduce the results of the original GAMUT combustion model, either a low searching level or a procedure to exclude high-temperature computational cells from the grouping should be applied to the unburned region, which was found to be more sensitive to the combustion model details. 1. Introduction CFD-based engine development is widely used in the automotive industry due to its much lower cost compared to experiment-based engine development [1]. Additionally, computer simulation provides more insight about the complex engine combustion process which is inaccessible or costly using current measurement techniques. Improved accuracy and efficiency in numerical models and rapidly advancing computer capabilities makes CFD-based engine development more feasible than ever. Thus, traditional empirical hardware-based optimization is being replaced with CFD-based optimization. As a result, the development time of a vehicle in the automotive industry has been reduced from average 60 months twenty years ago to 18 months today [2]. Detailed chemistry is necessary to reproduce kinetics-controlled processes, for instance, the processes of auto-ignition and pollutant emissions [3]. Understanding such processes is essential for improving engine performance, especially when considering strict emissions regulations. Advanced engine design concepts, including homogeneous charge compression ignition (HCCI), premixed charge compression ignition (PCCI), and modulated-kinetics (MK), are all chemical kinetics-controlled, and simulation of these combustion processes requires detailed chemistry. Detailed chemistry is often implemented into CFD software through coupling with the CHEMKIN package. For example, Kong and Reitz [4]
Pharmaceutical Crops: An Overview
Shiyou Li, Wei Yuan, Peiying Yang, Mikhail D. Antoun, Michael J. BalickGordon M. CraggPharmaceuticalcrops
Pharmaceutical Crops , 2010, DOI: 10.2174/2210290601001010001]
Abstract: Pharmaceutical crops is an ambiguous term used by biologists and chemists for different categories of plants. This review focuses on the definition and scope of pharmaceutical crops. We define pharmaceutical crops as those cultivated species that are used for extraction or preparation of therapeutic substances such as active pharmaceutical ingredients (APIs), excipients used in pharmaceutical formulations, vaccines and antibodies, as well as other therapeutic proteins. Based on the type of pharmaceutical product, these crops can be classified into three distinct yet sometimes overlapping categories: crops for the production of small therapeutic molecules (STMs), large therapeutic molecules (LTMs), or standardized therapeutic extracts (STEs). This review briefly discusses the relationships of pharmaceutical crops with traditional food crops, medicinal plants, medicinal crops, and invasive species. It also addresses the importance, advantages, problems, and challenges of research and development of pharmaceutical crops.
ULtiMATE System for Rapid Assembly of Customized TAL Effectors
Junjiao Yang, Pengfei Yuan, Dingqiao Wen, Ying Sheng, Shiyou Zhu, Yuezhou Yu, Xiang Gao, Wensheng Wei
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0075649
Abstract: Engineered TAL-effector nucleases (TALENs) and TALE-based constructs have become powerful tools for eukaryotic genome editing. Although many methods have been reported, it remains a challenge for the assembly of designer-based TALE repeats in a fast, precise and cost-effective manner. We present an ULtiMATE (USER-based Ligation Mediated Assembly of TAL Effector) system for speedy and accurate assembly of customized TALE constructs. This method takes advantage of uracil-specific excision reagent (USER) to create multiple distinct sticky ends between any neighboring DNA fragments for specific ligation. With pre-assembled templates, multiple TALE DNA-binding domains could be efficiently assembled in order within hours with minimal manual operation. This system has been demonstrated to produce both functional TALENs for effective gene knockout and TALE-mediated gene-specific transcription activation (TALE-TA). The feature of both ease-of-operation and high efficiency of ULtiMATE system makes it not only an ideal method for biologic labs, but also an approach well suited for large-scale assembly of TALENs and any other TALE-based constructions.
Oxygen Vacancy Induced Flat Phonon Mode at FeSe /SrTiO3 interface
Yun Xie,Hai-Yuan Cao,Yang Zhou,Shiyou Chen,Hongjun Xiang,Xin-Gao Gong
Physics , 2015, DOI: 10.1038/srep10011
Abstract: A high-frequency optical phonon mode of SrTiO3 (STO) was found to assist the high-temperature superconductivity observed recently at the interface between monolayer FeSe and STO substrate. However, the origin of this mode is not clear. Through first-principles calculations, we find that there is a novel polar phonon mode on the surface layers of the STO substrate, which does not exist in the STO crystals. The oxygen vacancies near the FeSe/STO interface drives the dispersion of this phonon mode to be flat and lowers its energy, whereas the charge transfer between STO substrate and FeSe monolayer further reduces its energy to 81 meV. This energy is in good agreement with the experimental value fitted by Lee et al. for the phonon mode responsible for the observed replica band separations and the increased superconducting gap. The oxygen-vacancy-induced flat and polar phonon mode provides clues for understanding the origin of high Tc superconductivity at the FeSe/STO interface.
SOMS: A Subway Operation and Maintenance System Based on Planned Maintenance Model with Train State  [PDF]
Jianlong Ding, Yong Qin, Limin Jia, Shiyou Zhu, Bo Yu
Journal of Intelligent Learning Systems and Applications (JILSA) , 2013, DOI: 10.4236/jilsa.2013.54021
Abstract: This paper aims to propose a modeling framework for subway operation and maintenance system (SOMS), which analyzes the train condition data based on both train sensor network data and basis train maintenance plan. The system is formulated into five function modules, and the research problem is to determine one auxiliary maintains plan, including the time allocation and frequency of maintenance. The case of Guangzhou metro is conducted to illustrate the applicability of SOMS, and the results reveal a number of interesting insights into subway maintenance system, i.e., the worksheet can reduce duplication of redundant maintenance work, the repair cost, and the damage caused by frequent disassembly.
Prediction of (TiO2)x(Cu2O)y Alloys for Photoelectrochemical Water Splitting
Heng-Rui Liu,Ji-Hui Yang,Yue-Yu Zhang,Shiyou Chen,Aron Walsh,Hongjun Xiang,Xingao Gong,Su-Huai Wei
Physics , 2013, DOI: 10.1039/C2CP44484D
Abstract: The formation of (TiO2)x(Cu2O)y solid-solutions are investigated using a global optimization evolutionary algorithm. First-principles calculations based on density functional theory are then used to gain insight into the electronic properties of these alloys. We find that: (i) Ti and Cu in (TiO2)x(Cu2O)y alloys have similar local environments as in bulk TiO2 and Cu2O except for (TiO2)(Cu2O) which has some trigonal-planar Cu ions. (ii) The predicted optical band gaps are around 2.1 eV (590 nm), thus having much better performance for the absorption of visible light compared with both binary oxides. (iii) (TiO2)2(Cu2O) has the lowest formation energy amongst all studied alloys and the positions of its band edges are found to be suitable for solar-driven water splitting applications.
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