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RISS 인기검색어
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- 저자 : ( Lingyu Zhu ) (검색결과 6 건)
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Catalytic performance of a Ti added Pd/SiO2 catalyst for acetylene hydrogenation
Lingyu Zhao,Mingyuan Zhu,Bin Dai,Zhong Wei 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
A series of Pd/SiO2 and Pd–Ti/SiO2 catalysts were prepared by the incipient wetness impregnation method. The catalytic performance for selective hydrogenation of acetylene to ethylene was measured under ‘‘high concentration acetylene’’, ‘‘high space velocity’’ and ‘‘no dilution gas’’ conditions. The crystal structure and particle size of the catalysts were characterized by the X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), nitrogen physisorption using the BET method and transmission electron microscope (TEM). The results showed that the titanium oxide in Pd–Ti/SiO2 catalyst was amorphous and the addition of Ti reduced the particle size of Pd significantly. Comparing to the Pd/SiO2catalyst, the ethylene yield increased from 64.1% to 88.3% under Pd–Ti/SiO2 catalytic system.
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Mechanical Behavior and Damage Evolution for Concrete Subjected to Multiple Impact Loading
Xudong Chen,Lingyu Xu,Qiao Zhu 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.6
In order to explore the dynamic mechanical properties and damage evolution for concrete under the repeated impact loading, the large-diameter (74 mm) Split Hopkinson Pressure Bar (SHPB) was used to conduct the dynamic compression test. The damage was calculated by the Weibull statistical damage model, and the stress-strain curves of concrete were analyzed to study the repeated impact loading effects on the damage of concrete. Meanwhile, the fracture process of the concrete was simulated with the finite element software (LS-DYNA) and Johnson Holmquist Concrete (*MAT_JOHNSON_HOLMQUIST_CONCRETE) constitutive model. The results showed that the dynamic elastic modulus and the peak stress of the specimens decreased with the increased number of repeated impacts, while the peak strain increased. The damage of concrete increased with the increased strain, and the damage increased sharply after the “inflection point”. In addition, the results obtained by finite element simulation agree with the experimental results.
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Cao Zhan,Yaxin Zhang,Yizheng Tang,Francesco Iannuzzo,Lingyu Zhu,Shengchang Ji,Frede Blaabjerg 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
The vibration fatigue mechanism in IGBT modules is critical, while experimental data on this topic is still insufficient. In this paper, a vibration-temperature test platform for IGBT modules is developed, and the sinusoidal vibration tests are conducted in the y-axis direction. The location of the vibration-sensitive components is identified by observation after broken fault indicated by static characteristics. It is observed that the bond wires in gate loops are fragile components. Then, high-frequency impedance between the gate- and Kelvin-emitter terminals is proposed as condition monitoring indicator during the vibration test. The impedance can be reflected by the peak voltage of a sampling resistor, which has noticeable variation before the complete disconnection of the bond wire. The beginning of the variation is defined as the failure point, which is much earlier than seen in the static characteristics. Then the number of cycles to failure (NCF) is investigated at various temperatures. The NCF is found to decrease with temperature. Post-failure observations of all tested 48 modules under test are conducted.
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( Zhen Cao ),( Ce Dou ),( Jianmei Li ),( Xiangyu Tang ),( Junyu Xiang ),( Chunrong Zhao ),( Lingyu Zhu ),( Yun Bai ),( Qiang Xiang ),( Shiwu Dong ) 생화학분자생물학회 2016 BMB Reports Vol.49 No.10
Mesenchymal stem cells (MSCs) are widely used in cartilage tissue engineering to repair articular cartilage defects. However, hypertrophy of chondrocytes derived from MSCs might hinder the stabilization of hyaline cartilage. Thus, it is very important to find a suitable way to maintain the chondrogenic phenotype of chondrocytes. It has been reported that cordycepin has anti-inflammatory and anti-tumor functions. However, the role of cordycepin in chondrocyte hypertrophy remains unclear. Therefore, the objective of this study was to determine the effect of cordycepin on chondrogenesis and chondrocyte hypertrophy in MSCs and ATDC5 cells. Cordycepin upregulated chondrogenic markers including Sox9 and collagen type II while down-regulated hypertrophic markers including Runx2 and collagen type X. Further exploration showed that cordycepin promoted chondrogenesis through inhibiting Nrf2 while activating BMP signaling. Besides, cordycepin suppressed chondrocyte hypertrophy through PI3K/Bapx1 pathway and Notch signaling. Our results indicated cordycepin had the potential to maintain chondrocyte phenotype and reconstruct engineered cartilage. [BMB Reports 2016; 49(10): 548-553]
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Nonlinear damage detection using higher statistical moments of structural responses
Ling Yu,Jun-Hua Zhu 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.2
An integrated method is proposed for structural nonlinear damage detection based on time seriesanalysis and the higher statistical moments of structural responses in this study. It combines the time seriesanalysis, the higher statistical moments of AR model residual errors and the fuzzy c-means (FCM) clusteringtechniques. A few comprehensive damage indexes are developed in the arithmetic and geometric mean ofthe higher statistical moments, and are classified by using the FCM clustering method to achieve nonlineardamage detection. A series of the measured response data, downloaded from the web site of the Los AlamosNational Laboratory (LANL) USA, from a three-storey building structure considering the environmentalvariety as well as different nonlinear damage cases, are analyzed and used to assess the performance of thenew nonlinear damage detection method. The effectiveness and robustness of the new proposed method arefinally analyzed and concluded.
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A MOM-based algorithm for moving force identification: Part II – Experiment and comparative studies
Ling Yu,Tommy H.T. Chan,Jun-hua Zhu 국제구조공학회 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.29 No.2
A MOM-based algorithm (MOMA) has been developed for moving force identification from dynamic responses of bridge in the companion paper. This paper further evaluates and investigates the properties of the developed MOMA by experiment in laboratory. A simply supported bridge model and a few vehicle models were designed and constructed in laboratory. A series of experiments have then been conducted for moving force identification. The bending moment and acceleration responses at several measurement stations of the bridge model are simultaneously measured when the model vehicle moves across the bridge deck at different speeds. In order to compare with the existing time domain method (TDM), the best method for moving force identification to date, a carefully comparative study scheme was planned and conducted, which includes considering the effect of a few main parameters, such as basis function terms, mode number involved in the identification calculation, measurement stations, executive CPU time, Nyquist fraction of digital filter, and two different solutions to the ill-posed system equation of moving force identification. It was observed that the MOMA has many good properties same as the TDM, but its CPU execution time is just less than one tenth of the TDM, which indicates an achievement in which the MOMA can be used directly for real-time analysis of moving force identification in field.
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