KMT-2017-BLG-0165Lb: A Super-Neptune-mass Planet Orbiting a Sun-like Host Star

Kil Jung, Youn,Gould, Andrew,Zang, Weicheng,Hwang, Kyu-Ha,Ryu, Yoon-Hyun,Han, Cheongho,Yee, Jennifer C.,Albrow, Michael D.,Chung, Sun-Ju,Shin, In-Gu,Shvartzvald, Yossi,Zhu, Wei,Cha, Sang-Mok,Kim, Dong American Astronomical Society 2019 The Astronomical journal Vol.157 No.2

A Study on Canadian-Sino Trade and Investment

Sun Zhong Wei(Zhong Wei Sun) 한국캐나다학회 2007 Asia-Pacific Journal of Canadian Studies (APJCS) Vol.13 No.1

Foreign trade and FDI(foreign direct investment) are the two routes to take part in the world economy competition and cooperation. This paper researches mainly on Canada’s foreign trade with China and Canada’s FDI in China. After reviewing China and Canada’s foreign trade and investment respectively, this paper concentrates on Canadian-Sino trade and Canada’s FDI in China. Under rapid growth of Canadian-Sino trade, the goods structure has changed along with China’s industrialization and development. This provides Canada a big opportunity and Challenge at the same time. At the back of soaring increase of Canada’s FDI in China, this paper does further research on the relation between Canada’s FDI in China and Canadian-Sino trade. By empirical analysis, the conclusion is paradox that the increase of Canada’s FDI in China leads to the decrease of the bilateral trade. Based on theory of OLI, this paper analyzes the reason that the fields of Canadian-Sino trade are different to the fields which Canada invested in China, and at the same time, explain the paradox well. This paper also predicts the future of Canadian-Sino trade and investment and gives some advices to Canada. At the end of this paper, some conclusions are drawn.

An Analyzing Method of Coupled Modes in Multi-Stage Planetary Gear System

Wei Sun,Jing Wei,Xin Ding,Xinglong Hu,Qingguo Wang 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.

This paper analyzed the natural frequency and coupled mode characteristics in multi-stage planetary gear system. A dynamic modelof multi-stage planetary gears with general description is established based on the lumped mass method. Solving the associatedeigenvalue problem, the vibration modes of the system with identical, equally spaced planets are classified into rotational,translational and planet modes with unique properties. A criterion to distinguish the dominant vibration stage for the two coupledmode types, rotational mode and translational mode, are provided by comparing the eigensensitivity to the component parametersof different planetary stages. Taken the dominant vibration stage as an independent single-stage planetary gear system, the naturalfrequencies and vibration modes are observed to be similar to the multi-stage. It is shown that the coupling in the multi-stageplanetary gear system grows as the frequency reduces. In rotational modes and translational modes, the highest eigensensitivity tomesh stiffness and planet bearing stiffness of each stage are associated with different frequencies in the higher-frequency range, whilethe highest eigensensitivity to bearing stiffness of carriers, rings, and suns occurred in the lower-frequency range.

A Study on Rotor Profiles Design for a Novel Twinscrew Kneader

Jing Wei,Qingchao Sun,Xujian Sun,Wei Sun 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.

The profile curve design method and the mathematical model of conjugate surfaces of twin-screw kneader used for high viscosity material mixing, transportation and malaxating are established according to the principle of gear engagement. A novel twin-screw kneader and the equations of the profile curves of the rotors as well as the rotor design are proposed. The working principles of the twin screw kneader are analyzed and numerical simulations for dynamic characteristics of the flow field are carried out Threedimensional,isothermal and steady state numerical analysis of a non-Newtonian fluid are presented, based on computational fluid dynamics (CFD) theory, and the characteristics under the conditions of different speeds and center distances are studied, such as pressure distributions, velocity fields, the maximum shear stresses and the mass flow rates. The results provide a theoretical basis for performance predictions and reasonable design for the novel twin-screw kneader.

Evaluation of Airport Capacity through Agent Based Simulation

Yang Peng,Gao Wei,Sun Junqing,Sun Bin 보안공학연구지원센터 2014 International Journal of Grid and Distributed Comp Vol.7 No.6

The operational capacity of an airport must be dimensioned under a long-term strategic view as its productivity is determined by available infrastructure. To predict the airport capacity and satisfy the domestic airport property, the operation procedure of airport is analyzed from the point of Multi-agent system. The proposed agent based architecture is a microscopic model of aircrafts' movement; each aircraft is represented as an agent capable of getting its routing results from instructing agent, and makes its own deconflicition decisions on the basis of a part of the observable scene local to that aircraft. An example of airport capacity evaluation is given, and the result is verified through comparison with SIMMOD. Finally, further research is applied to analysis the reason for delay.

Dynamic Thermal Rating of Transmission Line Based on Environmental Parameter Estimation

Sun, Zidan,Yan, Zhijie,Liang, Likai,Wei, Ran,Wang, Wei Korea Information Processing Society 2019 Journal of information processing systems Vol.15 No.2

The transmission capacity of transmission lines is affected by environmental parameters such as ambient temperature, wind speed, wind direction and so on. The environmental parameters can be measured by the installed measuring devices. However, it is impossible to install the environmental measuring devices throughout the line, especially considering economic cost of power grid. Taking into account the limited number of measuring devices and the distribution characteristics of environment parameters and transmission lines, this paper first studies the environmental parameter estimating method of inverse distance weighted interpolation and ordinary Kriging interpolation. Dynamic thermal rating of transmission lines based on IEEE standard and CIGRE standard thermal equivalent equation is researched and the key parameters that affect the load capacity of overhead lines is identified. Finally, the distributed thermal rating of transmission line is realized by using the data obtained from China meteorological data network. The cost of the environmental measurement device is reduced, and the accuracy of dynamic rating is improved.

Gradual electroforming and memristive switching in Pt/CuO_<i>x</i>/Si/Pt systems

Wei, L L,Shang, D S,Sun, J R,Lee, S B,Sun, Z G,Shen, B G IOP Pub 2013 Nanotechnology Vol.24 No.32

<P>We report a memristive switching effect in Pt/CuO<SUB><I>x</I></SUB>/Si/Pt devices prepared by the rf sputtering technique at room temperature. Differently from other Cu-based metal filament switching systems, a gradual electroforming process, marked by a gradual increase of the device resistance and a gradual decrease of the device capacitance, was observed in the current–voltage and capacitance characteristics. After the gradual electroforming, the devices show a uniform memristive switching behavior. By Auger electron spectroscopy analysis, a model based on the thickness change of the SiO<SUB><I>x</I></SUB> layer at the CuO<SUB><I>x</I></SUB>/Si interface and Cu ion migration is proposed for the gradual electroforming and uniform memristive switching, respectively. This work should be meaningful for the preparation of forming-free and homogeneous memristive devices.</P>

Management of Basic Scientific Research Achievements Based on Knowledge Supernetwork

Wei Sun,Chunhui Huo,Yang Yu 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.11

Basic scientific research achievements management involves multiple knowledge resources. We propose a knowledge supernetwork model to integrate multiple knowledge resources. First, person network, material carrier network, and knowledge element network are established. Subsequently, the knowledge supernetwork is constructed to integrate the above three networks. Second, the characteristics of knowledge supernetwork are investigated from the perspective of the quantitative analysis. Based on the knowledge supernetwork, some methods for solving real problems are developed. Finally, we construct a knowledge supernetwork model using real basic scientific research achievement files. The methods of knowledge representation, basic scientific research proposal grouping, and knowledge classification are proposed to illustrate how to manage basic scientific research achievement from the perspective of knowledge.

Crystalline ZnO thin film by hydrothermal growth

Sun, Ke,Wei, Wei,Ding, Yong,Jing, Yi,Wang, Zhong Lin,Wang, Deli Royal Society of Chemistry 2011 Chemical communications Vol.47 No.27

<P>In this work, we have successfully synthesised ZnO crystal thin film with a high quality from hydrothermal reaction on sapphire substrate. The growth mechanism is clarified based on an extensive XTEM study. In addition, electrical and optical properties of the crystal thin film, which can be controlled by impurities, are characterized. The synthesis technique provides fairly high quality and cost-effective substrates for optoelectronic and renewable energy applications.</P> <P>Graphic Abstract</P><P>The capability to control the structural/optical/electrical properties is enabled using a high quality ZnO thin film from solution for electronics and optoelectronics applications. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc11397f'> </P>

Short Synthesis of the Antidiabetic Octaketide Ethyl 2-(2,3,4-Trimethoxy-6-octanoylphenyl)acetate

Sun, Wei,Yuan, Yue,Lee, Bit,Jun, Hee-Sook,Shin, Dongyun,Seo, Seung-Yong Georg 2018 Synlett Vol. No.

<P>A facile and practical approach for the synthesis of ethyl 2-(2,3,4-trimethoxy-6-octanoylphenyl)acetate, an antidiabetic octaketide analogue of cytosporone B, is described. Unlike known approaches for the synthesis of cytosporones and their analogues, the key step of the developed route is a Friedel-Crafts alkylation of 1-(3,4,5-trimethoxyphenyl)octan-1-one with ethyl chloro(methylthio)acetate, followed by desulfurization.</P>