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Lei Gao,Feng Li,Ye Wang,Xing Mao Xiao,Peng Da Huo 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8
Solid-state bonding of heterogeneous materials is one of the effective ways to achieve light weight. An extrusion formingprocess for Mg/Al thickness-oriented bonding sheet was carried out. Due to triaxial compressive stress in the extrusion container,the AZ31 and AA6061 billets were deformed and the bonding and forming of Mg/Al thickness-oriented sheet can berealized by this method. The observation results of the bonding position by using XRD, SEM and EDS showed that: at theforming temperature with 360–420 °C, it had a good bonding interface, and the width of the transition layer increased withthe increase of the forming temperature. The presence of brittle intermetallic compounds in the transition layer indicated thatmetallurgical bonding had occurred at the interface. Considering all factors comprehensively, when the forming temperaturewas 390 °C, the bonding quality was appropriate. Its tensile-shear strength was 42 MPa, the width of the interface transitionlayer was about 10 μm, and the microhardness was about 164.3 HV. This method provided scientific guidance and technicalreserves for green forming of Mg/Al sheets.
Harmless Measurement of Tree Root Distribution Using Electrical Resistivity Method
Wenlan Guo,Junshen Gao1,Yun Zhang 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.11
The trees are of great meaning to the life and daily life of the human beings in various fields. However, the trees would disturb the normal activities of peoples. One of the problems is the growth of the tree roots close to the buildings or the roads can cause directly or indirectly structural damages. In this paper, a electrical measurement method based on resistivity is proposed The electrical property of tree root is analyzed. Finally, a tree root measurement system is built and practically tested.
홍동표,홍용,왕고평,김병진,김영문,이재정,김재열 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
This paper presents a primary study for a new method of enhancing measurement using impedance analysis method, which is widely used for structure health monitoring. Many of skyscrapers, bridges, tunnels, which have been built up several years, and nearly reached their operating life due to aging crack, material deterioration, and so on. therefore, the health monitoring technique has obtained considerable attention. The goal of this research is to show basic information to evaluate structural health condition using piezoelectric sensors. The piezoelectric materials have various merits. It is easy to shape various forms and can be embedded on the materials more conveniently. Moreover, the excitation frequency can be changed and the piezoelectric sensors cost less. All these features make the piezoelectric-based system applicable to structural healthy monitoring. This work presents a study for the development of a practical and quantitative technique for assessment of the structural health condition by piezoelectric impedance-based technique associated with longitudinal wave propagation. To estimate the damage condition numerically, we suggest the evaluation method Cov (Covariance) and CC (Correlation Coefficient) in this paper.
How Does Corporate Intelligence Level Affect Corporate Sustainability? Evidence from China
Wenxuan Gao(Wenxuan Gao),Shanyue Jin(Shanyue Jin) The International Academy of Global Business and T 2023 The International Academy of Global Business and T Vol.19 No.3
Purpose - Facing the backdrop of the digital economy and industrial transformation, China is interested in smart manufacturing to promote transformation, economic growth, and development. Executive characteristics when employing smart technology play an important role. This study aims to explore the relationship between various qualities and the sustainable development of enterprises. Design/Methodology/Approach - This study investigates the impact of corporate intelligence level on corporate sustainability in the digital economy era using a fixed-effects model with Chinese A-share listed companies from 2011 to 2020. It also explores the moderating roles of executive technical backgrounds, overseas backgrounds, and age on the impact of corporate intelligence level on corporate sustainability. Findings - The findings show that corporate intelligence level can contribute to sustainable development. Executive technical backgrounds, overseas backgrounds, and age have positive moderating effects on corporate intelligence level, which can contribute to sustainable development. Research Implications - This study indicates that enterprises will promote sustainable development if they place value on the qualities our findings have highlighted. Our study thus enriches the relevant research on smart manufacturing and sustainable development.
Corporate Liquidity Risk: A Case Study on the Evergrande Group in China
Wenxuan Gao(Wenxuan Gao) 아시아무역학회 2022 Journal of Asia Trade and Business Vol.9 No.2
Purpose - Given that China Evergrande Group has recently been caught in a liquidity risk, the purpose of this study is to identify and assess its liquidity using traditional financial indexes. We analyze the reasons for the liquidity risk exposures, so as to provide practical implications for real estate companies. Design/Methodology/Approach - This study combines the principal-agent and the trade-off theories in order to analyze China Evergrande Group’s exposure to liquidity risk under the leverage effect. In addition, China Evergrande Group’s financial position is analyzed in depth, and its liquidity risk is defined and identified. Findings - The results show that under the high leverage effect, the company suffers from a high liquidity risk, and eventually falls into a financial crisis due to the shortage of cash for short-term debt accumulated in previous periods, and the long delay in returns on property sales. Research Implications - This study provides a new perspective for debt research by examining the leverage and liquidity risk of real estate-related enterprises. During the golden era of the real estate industry, real estate enterprises should uphold the principle of moderation in debt management, make reasonable use of financial leverage, clarify the strategic goal of diversification, and avoid credit risk.
The Numerical Simulation Analysis of Flow Field in Level Control Valve of Water Storage Tank
Yaping Wang,Lei Gao,Jianghua Ge,Han Gao,Jing Zhang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.10
Level control valve of water storage tank is installed in the outlet of tank, which control the water level of water storage tank by adjusting the water emissions, which make great significance for the safe operation of the super (super) criticality thermal power unit boiler . Complete the simulation analysis of internal flow field by the method of numerical simulation ,in order to achieve structure improvements of level control valve of water storage tank, that make level control valve of water storage tank better meet the work requirements. Establish flow channel model and mesh models of level control valve of water storage tank in various stages of the open process. Make three dimensional viscous numerical simulation of the internal complex flow field by the computational fluid dynamics software of ANSYS CFX. The error between the simulation values of the flow coefficient and the theoretical values , trial values is less than 5% ,which verifies the correctness of the simulation results . Get pressure contour , velocity streamline diagrams and outlet mass flow of level control valve of water storage tank in various stages of the open process. According to the pressure contours and velocity streamline diagrams, make detailed analysis of the flow field of level control valve of water storage tank. According to the dates of outlet mass flow, fit the flow characteristic curve of level control valve of water storage tank. Provide a theoretical basis for the structural design of level control valve of water storage tank.
The Research of Data Mining Based on Application Data Pool
Minjie Bian,Jue Gao,JiePin Xu,Honghao Gao 보안공학연구지원센터 2014 International Journal of u- and e- Service, Scienc Vol.7 No.5
Today, people use various kinds of information technology applications to deal with applications in our daily life, which generates lots of information. However,most of the informationis just stored in many Distributed Heterogeneous Databases (DHDs) as log records, instead of being used abundantly and effectively. In this paper, we mainly discusses about how to use these data in useful ways by Data Mining (DM). Relative to thetraditional Data Mining based on Data Warehouse (WD),we propose a definition named Application Data Pool (ADP)replacing WD in this paper. And we design a KnowledgeDiscovery in Databases (KDD) model with ADP to use these data more efficiently. At last we use an application in Shanghai University ID Card designed with the ADP to prove the effectiveness and feasibility in KDD.