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Optimal Design of Smart Panel Using Admittance Analysis
Lijie Zhao,Heung Soo Kim,Jaehwan Kim 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.4
Optimal configuration of piezoelectric shunt structures is obtained by analyzing admittance of the system. The dissipated energy in the shunt circuit is a function of admittance. Therefore, admittance was selected as the cost function in the process of optimization. Taguchi method was used to determine the optimal configuration of piezoceramic patch bonded on the host structure. Full three dimensional finite element models were analyzed to simulate vibration modes of smart panel and to obtain the admittances of the system. Numerical admittance was validated by experiment. After optimizing process using admittance, the optimal configuration of piezoceramic patch was obtained. It is observed that the performance of smart panel can be predicted by analyzing admittance of piezoelectric structure and admittance can be used as a design index of smart panel.
Periodicity and attractivity for a rational recursive sequence
Lijie Zhang,Guang Zhang,Hui Liu 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.19 No.1-2
In this paper, the existence of periodic positive solution and the attractivity are investigated for the rational recursive sequence xn+1 =(A + axn−k)/(b + xn−l), where A, a and b are real numbers, k and l are nonnegative integer numbers.
Non-PVC계 재료를 적용한 수액세트용 튜브의 생물학적 안전성에 관한 연구
Lijie Duan,박창규,박종,전승호,김지흥,정동준 한국생체재료학회 2012 생체재료학회지 Vol.16 No.4
Infusion tube set made from PVC contains DEHP as plasticizer in order to provide elastic property. But the release of this DEHP from PVC tube occurs various clinical undesired effects in living body. In this study, we tried to develop non-PVC infusion tube using polybutadiene based polymer and styrene based copolymer. After processing 2 kinds of tube using above material, the biological safety was confirmed. As control, commercialized tubes(made by Hanaco(China) and JMS(Japan)) was adapted. From the results of safety test, we concluded that developed materials showed very weak cytotoxicity, good blood compatibility and excellent biological safety comparing to control group.
Mechanical Properties and Microstructure of Lime-Treated Red Clay
Lijie Chen,Xuejun Chen,He Wang,Xiang Huang,Yu Song 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.1
This research conducted a triaxial test on lime-treated clay with different contents to analyze the effect of mechanical properties. Scanning electron microscope (SEM) and low-field nuclear magnetic resonance (NMR) analysis were used to analyze the effect. X-ray diffraction (XRD) was used to analyze the chemical changes of calcium oxide on red clay. The results show that with the increase of calcium oxide content, the strength increases, and it can be increased by 282% at 200 kPa confining pressure. The calcium oxide in the red clay reactedwith the water in the soil to form calcium hydroxide. The alkaline environment will erode the edge of the soil particles and cause pores to become larger. SEM observed that the addition of calcium oxide caused the agglomeration of soil particles and changed the pore structure of red clay. Low-field NMR showed that calcium oxide had a significant effect on the pore structure of red clay. Calcium oxide increased the total pore volume of the soil sample. Calcium oxide had a substantial influence on the three pore distribution ranges, I (1.1 − 11 μm), II (15 − 137 μm), and III (137 − 512 μm). The porosity fitted with shear strength, it negatively correlated with I and III, and positively correlated with II.
Lijie You,Jianyin Fang,Xiaowu Mu 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.4
The stability problem is investigated for switched positive linear systems (SPLS) with unstabilized subsystem and actuator saturation. By using Lyapunov functions method and mode-dependent average dwell time (MDADT) strategy, sufficient conditions of the stability for the considered systems are established. We also give an estimate of the attraction domain. The convex hull represent approach is used to deal with actuator saturation. Finally, two examples are carried out to show the validity of results, which is less conservative than the average dwell time (ADT) switching.
Influence of Porosity on Mechanical Behavior of Porous Cu Fabricated via De‑Alloying of Cu–Fe Alloy
Lijie Zou,Fei Chen,Hao Wang,Qiang Shen,Enrique J. Lavernia,Lianmeng Zhang 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.1
We report on a study of the mechanical behavior of porous Cu containing micron-sized pores and fabricated by de-alloyingof a Cu–Fe precursor alloy. Our results show that the minimum volume fraction of pores that can be obtained by using anapproach that involves de-alloying of a Cu–Fe precursor alloy is approximately 40 vol%. Moreover, the average pore sizeformed by de-alloying Cu–Fe of varying compositions is in the range of 1.5–4.0 μm. Our mechanical behavior results revealthat the yield stress increases from 3.9 to 58.6 MPa as the volume fraction of porosity decreases from 78.9% to 39.3%. Moreover, our data shows that the influence of porosity on the relative yield stress and relative Young’s modulus conformsto the scaling equations of Gibson and Ashby as formulated for open-cell porous metals. The pore cell characteristics anddeformation modes of porous Cu produced by de-alloying Cu–Fe alloys were discussed in the context of the observed fluctuationsin the value of the constants C and n in the Gibson-Ashby scaling equation. The evolution of microstructure duringcompressive deformation of porous Cu was studied and the results reveal an increase in the fraction of low-angle grainboundaries, an increase in the number of twins and a decrease in the average grain size with increasing strain from 0% to 70%.
Efect of Heat Stress on Sargassum fusiforme Leaf Metabolome
Lijie Liu 한국식물학회 2020 Journal of Plant Biology Vol.63 No.3
Temperature is a major environmental factor afecting the growth, development, and productivity of Sargassum fusiforme. We aimed to assess the metabolic processes and regulatory mechanisms in S. fusiforme during a 7-day high-temperature (27 °C and 32 °C) experiment. Changes in chlorophyll content and electrolyte leakage after high-temperature treatment were investigated. Metabolic changes in the leaves of S. fusiforme were analysed using gas chromatography–mass spectrometry. High temperatures suppressed chlorophyll content and increased electrolyte leakage. Further, a strong modulation of various metabolisms was observed: organic acids, amino acids, sugars or sugar alcohols, esters, and amines. These metabolisms were signifcantly enriched in ten pathways under the 27 °C treatment: aminoacyl-tRNA biosynthesis; glycine, serine, and threonine metabolism; alanine, aspartate, and glutamate metabolism; valine, leucine, and isoleucine biosynthesis; cyanoamino acid metabolism; cysteine and methionine metabolism; arginine and proline metabolism; tyrosine metabolism; citrate cycle (TCA cycle); and glucosinolate biosynthesis. The various metabolisms signifcantly enriched seven pathways under the 32 °C treatment, namely, alanine, aspartate, and glutamate metabolism; aminoacyl-tRNA biosynthesis; phenylalanine metabolism; tyrosine metabolism; arginine and proline metabolism; nitrogen metabolism; and isoquinoline alkaloid biosynthesis. These changes in metabolic pathways may contribute to the tolerance and adaptability of S. fusiforme to high-temperature stress.