Research on Development Strategy of China Ice-Snow Sports Tourism Industry Based on SWOT-AHP Model- Case Study on Zhangjiakou

Wenjie Chen,Pan Zhou,Kihyung Bae 한국콘텐츠학회 2020 International Journal of Contents Vol.16 No.2

Modeling and analysis of electromagnetic radiation from solar cell in photovoltaic generation system

Wenjie Chen,Yiming Duan,Lei Guo,Yang Xuan 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6

Recently, the negative effect of leakage current in the DC side of photovoltaic (PV) generation system has been widely reported. Due to the large area of PV array, it becomes a secondary noise source that generates radiation emission. This paper presents a detailed analysis of near field radiation of photovoltaic panels. A novel antenna model is proposed to study this phenomenon. In contrast with other literature, the novelty of this paper reveals that radiation emission should be divided into two categories: low-frequency emission and high-frequency emission. It is proven that near field distribution of PV panel is frequency related and high-frequency near-field emission can differ dramatically from low-frequency condition. These proposed concepts have been verified experimentally with in-circuit tests in a 100 kVA PV generation system.

The applicability study and validation of TULIP code for full energy range spectrum

Chen Wenjie,Du Xianan,Wang Rong,Zheng Youqi,Wang Yongping,Wu Hongchun 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.12

NECP-SARAX is a neutronics analysis code system for advanced reactor developed by Nuclear Engineering Computational Physics Laboratory of Xi’an Jiaotong University. In past few years, improvements have been implemented in TULIP code which is the cross-section generation module of NECP-SARAX, including the treatment of resonance interface, considering the self-shielding effect in non-resonance energy range, hyperfine group method and nuclear library with thermal scattering law. Previous studies show that NECP-SARAX has high performance in both fast and thermal spectrum system analysis. The accuracy of TULIP code in fast and thermal spectrum system analysis is demonstrated preliminarily. However, a systematic verification and validation is still necessary. In order to validate the applicability of TULIP code for full energy range, 147 fast spectrum critical experiment benchmarks and 170 thermal spectrum critical experiment benchmarks were selected from ICSBEP and used for analysis. The keff bias between TULIP code and reference value is less than 300 pcm for all fast spectrum benchmarks. And that bias keeps within 200 pcm for thermal spectrum benchmarks with neutronmoderating materials such as polyethylene, beryllium oxide, etc. The numerical results indicate that TULIP code has good performance for the analysis of fast and thermal spectrum system

Bacterial Community Structure and Function Shift in Rhizosphere Soil of Tobacco Plants Infected by Meloidogyne incognita

Wenjie Tong(Wenjie Tong),Junying Li(Junying Li),Wenfeng Cong(Wenfeng Cong),Cuiping Zhang(Cuiping Zhang),Zhaoli Xu(Zhaoli Xu),Xiaolong Chen(Xiaolong Chen),Min Yang(Min Yang),Jiani Liu(Jiani Liu),Lei Yu 한국식물병리학회 2022 Plant Pathology Journal Vol.38 No.6

Root-knot nematode disease is a widespread and catastrophic disease of tobacco. However, little is known about the relationship between rhizosphere bacterial community and root-knot nematode disease. This study used 16S rRNA gene sequencing and PICRUSt to assess bacterial community structure and function changes in rhizosphere soil from Meloidogyne incognita-infected tobacco plants. We studied the rhizosphere bacterial community structure of M. incognita-infected and uninfected tobacco plants through a paired comparison design in two regions of tobacco planting area, Yuxi and Jiuxiang of Yunnan Province, southwest China. According to the findings, M. incognita infection can alter the bacterial population in the soil. Uninfested soil has more operational taxonomic unit numbers and richness than infested soil. Principal Coordinate Analysis revealed clear separations between bacterial communities from infested and uninfested soil, indicating that different infection conditions resulted in significantly different bacterial community structures in soils. Firmicutes was prevalent in infested soil, but Chloroflexi and Acidobacteria were prevalent in uninfested soil. Sphingomonas, Streptomyces, and Bradyrhizobium were the dominant bacteria genera, and their abundance were higher in infested soil. By PICRUSt analysis, some metabolism-related functions and signal transduction functions of the rhizosphere bacterial community in the M. incognita infection-tobacco plants had a higher relative abundance than those uninfected. As a result, rhizosphere soils from tobacco plants infected with M. incognita showed considerable bacterial community structure and function alterations.

Tunable All-optical Wavelength Conversion of a Femtosecond Pulse Based on Cascaded (2) SHG + DFG Interactions

Yuping Chen,Feng Lu,Wenjie Lu,Xianfeng Chen 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3

Based on cascaded second harmonic generation and difference-frequency generation interactions and employing a type-I quasi-phase-matching technique in MgO-doped periodically poled lithium niobate, we realized wavelength conversion of a 70-femtosecond pulse without pulse broadening at the group-velocity-matching wavelength. Due to the 25 nm bandwidth of second harmonic generation obtained in a 20-mm-long crystal, we convert a 70-fs pulse centered at 1.56 μm by using a continuous-wave signal at 1.60 μm. No obvious distortion or broadening of the converted pulse was observed. Based on cascaded second harmonic generation and difference-frequency generation interactions and employing a type-I quasi-phase-matching technique in MgO-doped periodically poled lithium niobate, we realized wavelength conversion of a 70-femtosecond pulse without pulse broadening at the group-velocity-matching wavelength. Due to the 25 nm bandwidth of second harmonic generation obtained in a 20-mm-long crystal, we convert a 70-fs pulse centered at 1.56 μm by using a continuous-wave signal at 1.60 μm. No obvious distortion or broadening of the converted pulse was observed.

Uncertainty quantification of once-through steam generator for nuclear steam supply system using latin hypercube sampling method

Lekang Chen,Chuqi Chen,Linna Wang,Wenjie Zeng,Zhifeng Li Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7

To study the influence of parameter uncertainty in small pressurized water reactor (SPWR) once-through steam generator (OTSG), the nonlinear mathematical model of the SPWR is firstly established. Including the reactor core model, the OTSG model and the pressurizer model. Secondly, a control strategy that both the reactor core coolant average temperature and the secondary-side outlet pressure of the OTSG are constant is adopted. Then, the uncertainty quantification method is established based on Latin hypercube sampling and statistical method. On this basis, the quantitative platform for parameter uncertainty of the OTSG is developed. Finally, taking the uncertainty in primary-side flowrate of the OTSG as an example, the platform application work is carried out under the variable load in SPWR and step disturbance of secondary-side flowrate of the OTSG. The results show that the maximum uncertainty in the critical output parameters is acceptable for SPWR.

Intelligent Operation Center for Hengqin New Area Smart Grid

Zheng, Wenjie,Chen, Hui,Li, Chuanjian,Yu, Nanhua,Chen, Jiongcong The Korean Institute of Electrical Engineers 2014 The Journal of International Council on Electrical Vol.4 No.3

This paper presents a framework of intelligent operation center (IOC)for Hengqin New Area smart grid demonstration project in terms of IT topology and system functionalities. The platform is developed based on Service Oriented Architechture(SOA) and the newly released enterprise standards of China Southern Grid (CSG).The system information covers transmission system, substation and distribution system on Hengqin Island by monitoring the status of various devices with cutting edge technologies as well as coordinating and merging different systems in a new platform which is expected to enable a more intelligent way for future operation and maintenance information exchange in between the systems currently used. In addition, it will not only enhance the system operational efficiency but also create a novel management experience for further promotion of IOC in the continuously deregulated market environment within service areas of CSG.

Optimal design of composite laminates for minimizing delamination stresses by particle swarm optimization combined with FEM

Chen, Jianqiao,Peng, Wenjie,Ge, Rui,Wei, Junhong Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.31 No.4

The present paper addresses the optimal design of composite laminates with the aim of minimizing free-edge delamination stresses. A technique involving the application of particle swarm optimization (PSO) integrated with FEM was developed for the optimization. Optimization was also conducted with the zero-order method (ZOM) included in ANSYS. The semi-analytical method, which provides an approximation of the interlaminar normal stress of laminates under in-plane load, was used to partially validate the optimization results. It was found that optimal results based on ZOM are sensitive to the starting design points, and an unsuitable initial design set will lead to a result far from global solution. By contrast, the proposed method can find the global optimal solution regardless of initial designs, and the solutions were better than those obtained by ZOM in all the cases investigated.

Improved Ethanol Production in Jerusalem Artichoke Tubers by Overexpression of Inulinase Gene in Kluyveromyces marxianus

WenJie Yuan,Xinqing Zhao,Li-Jie Chen,Feng-Wu Bai 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.4

Ethanol production from Jerusalem artichoke tubers through a consolidated bioprocessing (CBP) strategy using the inulinase-producing yeast Kluyveromyces marxianus is an economical and competitive than that from a grainbased feedstock. However, poor inulinase production under ethanol fermentation conditions significantly prolongs the fermentation time and compromises ethanol productivity. Improvement of inulinase activity appears to be promising for increasing ethanol production from Jerusalem artichoke tubers by CBP. In the present study, expression of the inulinase gene INU with its own promoter in K. marxianus (K/INU2) was explored using the integrative cassette. Overexpression of INU was explored using chromosome integration via the HO locus of the yeast. Inulinase activity and ethanol were determined from inulin and Jerusalem artichoke tubers under fed-batch operation. Inulinase activity was 114.9 U/mL under aerobic conditions for K/INU2, compared with 52.3 U/mL produced by the wild type strain. Importantly, inulinase production was enhanced in K/INU2 under ethanol fermentation conditions. When using 230 g/L inulin and 220 g/L Jerusalem artichoke tubers as substrates, inulinase activities of 3.7 and 6.8 U/mL,respectively, were measured using K/INU2, comparing favorably with 2.4 and 3.1 U/mL, respectively, using the wide type strain. Ethanol concentration and productivity for inulin were improved by the recombinant yeast to 96.2 g/L and 1.34 g/L/h, respectively, vs 93.7 g/L and 1.12 g/L/h,respectively, by the wild type strain. Ethanol concentration and productivity improvements for Jerusalem artichoke tubers were 69 g/L and 1.44 g/L/h, respectively, from the recombinant strain vs 62 g/L and 1.29 g/L/h, respectively,from the wild type strain.

中国新型职业农民培育研究

罗雯杰(Wenjie Luo),陈旭东(Xudong Chen) YIXIN 출판사 2024 Journal of China Studies Vol.2 No.2