http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Limin Gao (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Limin Gao,Jing Li,Ying Li,Fuqiang Zhang 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6
Objectives: The aim of this study tried to find an appropriate addition of mullite to modify zirconia in order to improve the shortcomings of zirconia for clinical applications. Methods: 10%, 20%, 30%, 40%, 50% (on weight basis) mullite modified zirconia (MDZ) were fabricated.The hardness,fracture toughness and elastic modulus were tested on specimens prepared through respective methods. Results: The flexural strength, hardness and elastic modulus of these five groups decreased with an increase in the percentage of mullite, which may be ascribed to the increasing presence of a glassy phase. The fracture toughness of the 30% mullite content showed a similar result with the 10% group. Conclusions: In general, an increase in the content of mullite is accompanied with a decrease of the strength and fracture toughness. The MDZ with a 10% content of mullite presents better mechanical properties and a better comprehensive clinical performance may be expected from.
-
Gao Liai,Zhou Yongjie,Su Kun,Hou Chenwei,Huo Limin 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.10
It is one of the effective methods to improve the reliability of the distribution system by using looped network power supply. With the development of new energy technology, distributed generation has been more widely used. But a small power system named micro-grid which is assembled by the device such as distributed generation, energy storage device and controllable load in a certain operating rules catches the attention of people. It can operate in islanded mode with the power grid failure, which can greatly improve the reliability of the system. Traditional analytical method and Monte Carlo method are difficult to evaluate its reliability accurately. In this paper, a new artificial intelligence method based on Bayesian networks is used for the system reliability analysis and evaluation. The corresponding Bayesian networks are established for the reliability test bus 2 which containing looped network and the improve reliability test bus 6 which containing micro-grids separately. With the help of causal reasoning and diagnostic reasoning, the supply influence of different types of DG output intermittent, operation mode on loads are detected, the key factors which have an impact on important load power supply reliability are found out, which is the theoretical foundation for practical engineering decision, so as to improve system reliability, identify failures and make maintenance scheduling.
-
Ping Xiao,Hong Gao,Limin Niu 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.7
Due to the fail safe problem, it was difficult for the existing Magnetorheological damper (MD) to be widely applied in automotive suspensions. Therefore, permanent magnets and magnetic valves were introduced to existing MDs so that fail safe problem could be solved by the magnets and damping force could be adjusted easily by the magnetic valve. Thus, a new Magnetorheological damper with permanent magnet and magnetic valve (MDPMMV) was developed and MDPMMV suspension was studied. First of all, mechanical structure of existing magnetorheological damper applied in automobile suspensions was redesigned, comprising a permanent magnet and a magnetic valve. In addition, prediction model of damping force was built based on electromagnetics theory and Bingham model. Experimental research was conducted on the newly designed damper and goodness of fit between experiment results and simulated ones by models was high. On this basis, a quarter suspension model was built. Then, fruit Fly optimization algorithm (FOA)-optimal control algorithm suitable for automobile suspension was designed based on developing normal FOA. Finally, simulation experiments and bench tests with input surface of pulse road and B road were carried out and the results indicated that working performance of MDPMMV suspension based on FOA-optimal control algorithm was good.
-
Yuhua Wang,Hui Huang,Limin Gao and,Fuqiang Zhang 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.4
To study the mechanical and optical properties of a new nanocrystalline yttria-stabilized zirconia (PX242A Tosoh Japan). The influence of heating rates on its properties and its potential use as a dental ceramic were also evaluated. Samples of PX242A were divided into 4 groups according to heating rates : group H1 (100oKh−1); group H2 (200oKh−1); group H4 (400oKh−1);group H6 (600oKh−1). Group H0 (3Y-SBE Tosoh Japan) was made according to the manufacturer’s recommendation as a control. The contrast ratio (CR), transparency parameter (TP) and total transmittance (TT) were measured by an Xrite spectrophotometer. The flexural strength and fracture toughness were also evaluated. The flexural strength and fracture toughness were found to be independent of the heating rate while the optical properties significantly increased when the heating rates were 600oKh−1, 200oKh−1 and 400oKh−1, but were not significantly different with 100oKh−1. A heating rate of 600oKh−1 is suggested as a time efficiency protocol, because it could provide desirable mechanical and optical properties,making zirconia suitable for clinical use.
-
Mechanical properties of self-drilling orthodontic micro-implants with different diameters.
Chen, Yan,Kyung, Hee Moon,Gao, Limin,Yu, Won-Jae,Bae, Eun-Ju,Kim, Sang-Min Angle Orthodontists Research and Education Foundat 2010 The Angle orthodontist Vol.80 No.5
<P>OBJECTIVE: The hypothesis to be tested is that peak-insertion torque of self-drilling micro-implants of an appropriate diameter correlates with peak-removal torque mechanically. MATERIALS AND METHODS: A total of 360 self-drilling micro-implants composed of five different types were used. They (24 of each group) were inserted in three types of artificial bone with the use of a driving torque tester at a speed of 15 rpm. Insertion torque was measured during the placement, while the removal torque was measured within 3 days after insertion. RESULTS: Most of the micro-implants in type A sheared before they were completely inserted in 40-pounds per cubic foot bone. The implants in other types were successfully inserted without implant breakage and bone fracture in all bone densities. There was a statistically significant correlation between insertion torque and removal torque (r > or = 0.43543, P = .0001). There were significant differences in insertion and removal torque among the diameters of implants and bone densities with an increasing tendency. The torque loss rates reduced as the diameter of the implant and bone density increased. CONCLUSIONS: Micro-implants with a diameter of less than 1.3 mm are unsuitable for insertion into a bone with a density greater than 40 pounds per cubic foot mechanically when one is using a self-drilling technique.</P>
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
