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Search Results: 1 - 10 of 104287 matches for " Yongan Zhang "
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Percolation on the institute-enterprise R&D collaboration networks
Chenguang Li,Yongan Zhang
Computer Science , 2013,
Abstract: Realistic network-like systems are usually composed of multiple networks with interacting relations such as school-enterprise research and development collaboration networks. Here we study the percolation properties of a special kind of that R&D collaboration networks, namely institute-enterprise R&D collaboration networks. We introduce two actual IERDCNs to show their structural properties, and present a mathematical framework based on generating functions for analyzing an interacting network with any connection probability. Then we illustrate the percolation threshold and structural parameter arithmetic in the sub-critical and supercritical regimes. We compare the predictions of our mathematical framework and arithmetic to data for two real R&D collaboration networks and a number of simulations, and we find that they are in remarkable agreement with the data. We show applications of the framework to electronics R&D collaboration networks.
Analysis on the Durability of Hybrid Polymer Composites for Power FGD System  [PDF]
Zhenyu Wang, Lijie Xiu, Enhou Han, Yunhe Zhang, Yongan Zhao, Ming Liu
Journal of Power and Energy Engineering (JPEE) , 2016, DOI: 10.4236/jpee.2016.43001
Abstract: The corrosion condition of flue gas desulfurization (FGD) equipment for the coal-fired power plant was defined as the strong corrosion grade. The lining system of hybrid polymer composite was used in internal cylinder of steel chimney, and a corrosion-resistant and heat-resistant protective layer was formed on the metal surface. The corrosion-resistant and ageing-resistant properties of hybrid polymer composite prepared at low temperature after four years of practical use were investigated by differential scanning calorimeter (DSC), scanning electron microscopy (SEM) and measurement of gravimetric variation, contact angle, abrasion resistance, bonding strength and tensile strength. The properties of hybrid polymer composites prepared at 25 and 15 were comparatively analyzed in the paper.
Review on Techniques for On-Line Monitoring of Resistance Spot Welding Process
Yanhua Ma,Pei Wu,Chuanzhong Xuan,Yongan Zhang,He Su
Advances in Materials Science and Engineering , 2013, DOI: 10.1155/2013/630984
Abstract: Resistance spot welding has been widely used for joining sheet metals, especially in automotive and aerospace industries. However, since the formation of weld nugget is invisible in resistance spot welding, traditionally off-line destructive test is applied for inspection of the weld quality, which is costly and inefficient. Therefore, in recent years, a lot of efforts have been made in estimating or detecting the weld quality nondestructively by on-line welding parameter monitoring. This paper presents a review on techniques of monitoring resistance spot welding process or weld quality, and the advantages as well as limitations of these techniques are discussed. 1. Introduction Resistance spot welding (RSW) is widely used for joining sheet metals and is recognized as the most rapid and economic joining method, its unique advantages have kept it as one of the most productive and competitive joining technologies in automotive, aerospace, and other metal processing industries [1–4]. However, due to the fact that the welding time is short and the weld nugget (as shown in Figure 1) is formed inside the workpiece in resistance spot welding, which is invisible and the weld quality can not be assessed by simply observing the nugget, destructive test and such as peel test, shear test, traditionally has to be used for inspection of the weld quality, which is unsatisfactory:(1)wasteful of time and materials;(2)if the test reveals a defect, all the components welded since the last test may have to be scrapped;(3)since the inspection is on sampling basis, it cannot be guaranteed that all the welds in the accepted lot are defect-free;(4)difference between poor and good weld is not visible to naked eye. Figure 1: Resistance spot welding. In addition there is a large number of interrelated variables in resistance welding; weld quality is extremely operation dependent and varied from part to part due to such changes as workpiece surface condition, electrode tip fit-up, circuit impedance, shunt effect, and so forth Therefore, in recent years, a lot of efforts have been made in estimating or detecting the weld quality nondestructively by on-line welding parameter monitoring or on-line visual inspection of the welding spot, which is especially beneficial to the continuous production of automated system as the faults may be immediately identified and rectified [5, 6]. The principle of in-process monitoring and weld quality control is monitoring some phenomena or characteristics which occurs or changes during the formation of the nugget. Although in-process weld quality
Purification and Characterization of a CkTLP Protein from Cynanchum komarovii Seeds that Confers Antifungal Activity
Qinghua Wang,Fuguang Li,Xue Zhang,Yongan Zhang,Yuxia Hou,Shengrui Zhang,Zhixia Wu
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0016930
Abstract: Cynanchum komarovii Al Iljinski is a desert plant that has been used as analgesic, anthelminthic and antidiarrheal, but also as a herbal medicine to treat cholecystitis in people. We have found that the protein extractions from C. komarovii seeds have strong antifungal activity. There is strong interest to develop protein medication and antifungal pesticides from C. komarovii for pharmacological or other uses.
Experimental and density functional theory study of the adsorption of N2O on ion-exchanged ZSM-5: Part II. The adsorption of N2O on main-group ion-exchanged ZSM-5

Bo Zhang,Yongan Lu,Hong He,Jianguo Wang,Changbin Zhang,Yunbo Yu,Li Xue,

环境科学学报(英文版) , 2011,
Abstract: The adsorption and desorption of N2O on main-group ion-exchanged ZSM-5 was studied using temperature-programmed desorption (TPD) and density functional theory (DFT) calculations. TPD experiments were carried out to determine the desorbed temperature Tmax corresponding to the maximum mass intensity of N2O desorption peak and adsorption capacity of N2O on metal-ion-exchanged ZSM- 5s. The results indicated that Tmax followed a sequence of Ba2+ > Ca2+ > Cs+ > K+ > Na+ > Mg2+and the amount of adsorbed N2O on main-group metal cation followed a sequence of Ba2+ > Mg2+ > Ca2+ > Na+ > K+ > Cs+. The DFT calculations were performed to obtain the adsorption energy (Eads), which represents the strength of the interaction between metal cations and the N-end or O-end of N2O. The calculation results showed that the N-end of the N2O molecule was favorably adsorbed on ion-exchanged ZSM-5, except for Cs-ZSM-5. For alkali metal cations, the Eads of N2O on cations followed the order which was the same to that of Tmax: Cs+ > K+ > Na+. The calculated and experimental results consistently showed that the adsorption performances of alkaline-earth metal cations were better than those of alkali metal cations.
STRUCTURES AND PROPERTIES OF SURFACE COMPOSITE PIPE OF Al-Ni ALLOY MADE BY ELECTROMAGNETIC PROCESSING
电磁搅拌自生表面复合材料的组织与性能

JIN Junze,ZHANG Yongan,CAO Zhiqiang,
金俊泽
,张永安,曹志强

材料研究学报 , 1998,
Abstract: In this paper, an in situ surface composite pipe of Al-Ni alloy, with Al3Ni-rich layer accumulated in inner layer, a litter in outer layer and free in middle layer, has been produced by means of unidirectional solidification in a rotating electromagnetic field. The results observed with scanning electron microscope show that the separated layers are composed of the primary phases accumulating mechanically and growing in a preferred orientation. The joint strength was investigated by Material Testing Systems (MTS810) and the corrosion characteristics were also analyzed.
Structural and Functional Difference of Pheromone Binding Proteins in Discriminating Chemicals in the Gypsy Moth, Lymantria Dispar
Yanxue Yu, Fei Ma, Yixia Cao, Junhua Zhang, Yongan Zhang, Shengnan Duan, Yadong Wei, Shuifang Zhu, Naizhong Chen
International Journal of Biological Sciences , 2012,
Abstract: Pheromone-binding proteins (PBPs) of the gypsy moth, Lymantria dispar L., play an important role in olfaction. Here structures of PBPs were first built by Homology Modeling, and each model of PBPs had seven α-helices and a large hydrophobic cavity including 25 residues for PBP1 and 30 residues for PBP2. Three potential semiochemicals were first screened by CDOCKER program based on the PBP models and chemical database. These chemicals were Palmitic acid n-butyl ester (Pal), Bis(3,4-epoxycyclohexylmethyl) adipate (Bis), L-trans-epoxysuccinyl-isoleucyl-proline methyl ester propylamide (CA-074). The analysis of chemicals docking the proteins showed one hydrogen bond was established between the residues Lys94 and (+)-Disparlure ((+)-D), and л-л interactions were present between Phe36 of PBP1 and (+)-D. The Lys94 of PBP1 formed two and three hydrogen bonds with Bis and CA-074, respectively. There was no residue of PBP2 interacting with these four chemicals except Bis forming one hydrogen bond with Lys121. After simulating the conformational changes of LdisPBPs at pH7.3 and 5.5 by constant pH molecular dynamics simulation in implicit solvent, the N-terminal sequences of PBPs was unfolded, only having five α-helices, and PBP2 had larger binding pocket at 7.3 than PBP1. To investigate the changes of α-helices at different pH, far-UV and near-UV circular dichroism showed PBPs consist of α-helices, and the tertiary structures of PBP1 and PBP2 were influenced at pH7.3 and 5.5. The fluorescence binding assay indicated that PBP1 and PBP2 have similarly binding affinity to (+)-D at pH 5.5 and 7.3, respectively. At pH 5.5, the dissociation constant of the complex between PBP1 and 2-decyl-1-oxaspiro [2.2] pentane (OXP1) was 0.68±0.01μM, for (+)-D was 5.32±0.11μM, while PBP2 with OXP1 and (+)-D were 1.88±0.02μM and 5.54±0.04μM, respectively. Three chemicals screened had higher affinity to PBP1 than (+)-D except Pal at pH5.5, and had lower affinity than (+)-D at pH7.3. To PBP2, these chemicals had lower affinity than the sex pheromone except Bis at pH 5.5 and pH 7.3. Only PBP1 had higher affinity with Sal than the sex pheromone at pH 5.5. Therefore, the structures of PBP1 and PBP2 had different changes at pH5.5 and 7.3, showing different affinity to chemicals. This study helps understanding the role of PBPs as well as in developing more efficient chemicals for pest control.
Metallic nano-particles for trapping light
Yongan Tang and Branislav Vlahovic
Nanoscale Research Letters , 2013, DOI: 10.1186/1556-276X-8-65
Abstract: 73.20.Mf, 42.25.s, 88.40.hj
Identification and Profiling of microRNAs and Their Target Genes from Developing Caprine Skeletal Muscle
Yanhong Wang, Chunlei Zhang, Xingtang Fang, Yulong Zhao, Xiaohui Chen, Jiajie Sun, Yang Zhou, Jianjin Wang, Yongan Wang, Xianyong Lan, Hong Chen
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0096857
Abstract: Goat is an important agricultural animal for meat production. Functional studies have demonstrated that microRNAs (miRNAs) regulate gene expression at the post-transcriptional level and play an important role in various biological processes. Although studies on miRNAs expression profiles have been performed in various animals, relatively limited information about goat muscle miRNAs has been reported. To investigate the miRNAs involved in regulating different periods of skeletal muscle development, we herein performed a comprehensive research for expression profiles of caprine miRNAs during two developmental stages of skeletal muscles: fetal stage and six month-old stage. As a result, 15,627,457 and 15,593,721 clean reads were obtained from the fetal goat library (FC) and the six month old goat library (SMC), respectively. 464 known miRNAs and 83 novel miRNA candidates were identified. Furthermore, by comparing the miRNA profile, 336 differentially expressed miRNAs were identified and then the potential targets of the differentially expressed miRNAs were predicted. To understand the regulatory network of miRNAs during muscle development, the mRNA expression profiles for the two development stages were characterized and 7322 differentially expressed genes (DEGs) were identified. Then the potential targets of miRNAs were compared to the DEGs, the intersection of the two gene sets were screened out and called differentially expressed targets (DE-targets), which were involved in 231 pathways. Ten of the 231 pathways that have smallest P-value were shown as network figures. Based on the analysis of pathways and networks, we found that miR-424-5p and miR-29a might have important regulatory effect on muscle development, which needed to be further studied. This study provided the first global view of the miRNAs in caprine muscle tissues. Our results help elucidation of complex regulatory networks between miRNAs and mRNAs and for the study of muscle development.
Metallic nano-structures for polarization-independent multi-spectral filters
Tang Yongan,Vlahovic Branislav,Brady David
Nanoscale Research Letters , 2011,
Abstract: Cross-shaped-hole arrays (CSHAs) are selected for diminishing the polarization-dependent transmission differences of incident plane waves. We investigate the light transmission spectrum of the CSHAs in a thin gold film over a wide range of features. It is observed that two well-separated and high transmission efficiency peaks could be obtained by designing the parameters in the CSHAs for both p-polarized and s-polarized waves; and a nice transmission band-pass is also observed by specific parameters of a CSHA too. It implicates the possibility to obtain a desired polarization-independent transmission spectrum from the CSHAs by designing their parameters. These findings provide potential applications of the metallic nano-structures in optical filters, optical band-pass, optical imaging, optical sensing, and biosensors.
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