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Zhi-hao Li,Bin Zhou,Xiu-ting Li,Shu-gang Li 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.1
In this current study, comparative study betweenthe effect of electrolyzed water and ultrapure water on theextraction of apricot protein was conducted. The resultsrevealed that under the condition of same pH (pH = 9.5),the extraction efficiency of electrolyzed water on apricotprotein was superior to that of ultrapure water. Moreover,apricot protein (EAP) extracted by electrolyzed water displayedpreferable foaming capacity and emulsion stability. The foaming capacity and emulsion stability of EAP were11.17% and 36.33 min, for UAP, only 4.75% and23.88 min, respectively. Meanwhile, compared to UAP,the secondary structure of EAP was more orderly, in whichthe orderly structures of a-helix and b-sheet were 7.5 and60.2%, while the disorderly structures of b-turn and randomcoil were 8.4 and 23.8%. This work provided a novelextraction strategy, which could improve the extractionrate and minimize the destruction of the structure andfunctional properties of apricot protein.
Good performance of Sc (0001) surface adsorbing CO molecule
Hao Zhi-Qiang,Yang Jian-Long,Li Hui,Yao Jian-Gang 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.9
There is a big discrepancy in terms of calculating the surface energy of the HCP Sc (0001) surface for previous theoretical results. Herein, we used a relatively reasonable method to predict the calculated value (1.263 J/m2), which agrees well with the experimental outcome (1.275 J/m2). Based on this, the adsorption behaviors of CO at different sites, i.e., hollow (H1, H2, and H3), bridge (B1), and top sites (T1), were explored theoretically. The results suggest that hollow sites, particularly the H1 site exhibits a good performance in adsorbing CO molecule, and that the adsorption energy reaches nearly 3.5 eV, which corresponds to a significant elongation of the C–O distance (more than 24%). In addition, the CO adsorbed at the H1 site is seen to be located parallelly at the surface. An obvious substantive variation of the CO molecular orbit of H1 adsorption site is observed.
Hao Tang,Nian-Guang Li,Zhi-Hao Shi,Yu-Ping Tang,Qian-Ping Shi,Ze-Xi Dong,Peng-Xuan Zhang,Jin-ao Duan 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.10
The binding abilities of scutellarin (Scu) andscutellarein (Scue) with bovine serum albumin (BSA) wereinvestigated using equilibrium dialysis, high performanceliquid chromatography, fluorescence spectroscopy, competitivesite marker and molecular docking. The resultsshowed that the average protein binding ratios of Scu andScue with BSA were (79.85 ± 1.83) and (85.49 ± 1.21) %respectively. Under simulated physiological conditions, thefluorescence data indicated that Scu and Scue bound withBSA through a static mechanism. The thermodynamicparameters indicated that the interactions of Scu-BSA andScue-BSA mainly occurred by van der Waals forces andhydrogen bonds and it was easier for Scue to bind withBSA than Scu, indicating that the glucuronic acid moleculein Scu decreased the binding affinity. Site competitivemarker experiments showed that the binding sites of Scuand Scue mainly located within the sub-domain IIA ofBSA. Furthermore, molecular docking studies indicatedthat one BSA could bind three Scue, while one BSA couldcarry only two Scu. All these results clearly indicated theinteractions of Scu and Scue with BSA, which will lay thefoundation for further research to determine the pharmacologyand pharmacodynamics of Scu and Scue for treatingischemic cerebrovascular disease.
Impact of cable sag on the efficiency of an inertial mass damper in controlling stay cable vibrations
Zhi-hao Wang,Hui Gao,Yan-wei Xu,Zheng-qing Chen,Hao Wang 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.24 No.1
Passive negative stiffness dampers (NSDs) that possess superior energy dissipation abilities, have been proved to be more efficient than commonly adopted passive viscous dampers in controlling stay cable vibrations. Recently, inertial mass dampers (IMDs) have attracted extensive attentions since their properties are similar to NSDs. It has been theoretically predicted that superior supplemental damping can be generated for a taut cable with an IMD. This paper aims to theoretically investigate the impact of the cable sag on the efficiency of an IMD in controlling stay cable vibrations, and experimentally validate superior vibration mitigation performance of the IMD. Both the numerical and asymptotic solutions were obtained for an inclined sag cable with an IMD installed close to the cable end. Based on the asymptotic solution, the cable attainable maximum modal damping ratio and the corresponding optimal damping coefficient of the IMD were derived for a given inertial mass. An electromagnetic IMD (EIMD) with adjustable inertial mass was developed to investigate the effects of inertial mass and cable sag on the vibration mitigation performance of two model cables with different sags through series of first modal free vibration tests. The results show that the sag generally reduces the attainable first modal damping ratio of the cable with a passive viscous damper, while tends to increase the cable maximum attainable modal damping ratio provided by the IMD. The cable sag also decreases the optimum damping coefficient of the IMD when the inertial mass is less than its optimal value. The theoretically predicted first modal damping ratio of the cable with an IMD, taking into account the sag generally, agrees well with that identified from experimental results, while it will be significantly overestimated with a taut-cable model, especially for the cable with large sag.
Vibration control of a stay cable with a rotary electromagnetic inertial mass damper
Zhi Hao Wang,Yan Wei Xu,Hui Gao,Zheng Qing Chen,Kai Xu,Shun Bo Zhao 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.23 No.6
Passive control may not provide enough damping for a stay cable since the control devices are often restricted to a low location level. In order to enhance control performance of conventional passive dampers, a new type of damper integrated with a rotary electromagnetic damper providing variable damping force and a flywheel serving as an inertial mass, called the rotary electromagnetic inertial mass damper (REIMD), is presented for suppressing the cable vibrations in this paper. The mechanical model of the REIMD is theoretically derived according to generation mechanisms of the damping force and the inertial force, and further validated by performance tests. General dynamic characteristics of an idealized taut cable with a REIMD installed close to the cable end are theoretically investigated, and parametric analysis are then conducted to investigate the effects of inertial mass and damping coefficient on vibration control performance. Finally, vibration control tests on a scaled cable model with a REIMD are performed to further verify mitigation performance through the first two modal additional damping ratios of the cable. Both the theoretical and experimental results show that control performance of the cable with the REIMD are much better than those of conventional passive viscous dampers, which mainly attributes to the increment of the damper displacement due to the inertial mass induced negative stiffness effects of the REIMD. Moreover, it is concluded that both inertial mass and damping coefficient of an optimum REIMD will decrease with the increase of the mode order of the cable, and oversize inertial mass may lead to negative effect on the control performance.
Zhi Hao,Junqi Shen,Xiang Sheng,Zong Shen,Le Yang,Xuefeng Lu,Zhu Luo,Qiang Zheng 한국섬유공학회 2020 Fibers and polymers Vol.21 No.2
This paper details a new method for improving the interfacial bonding between PA66 short fiber (PSF) and natural rubber (NR) by reaction of the methacrylic acid (MAA)-grafting-modified PSF with rubber during vulcanization. Carboncarbon double bonds introduced to the SF surface by MAA grafting were opened, and a vulcanization reaction occurred between the modified PSF and rubber in the presence of sulfur. The chemical reactions were verified by FTIR and XPS. The processing rheological behaviors of the compounded composites were investigated by a rubber processing analyzer (RPA). The morphology of modified PSF was characterized by AFM and SEM. The improved interfacial bonding was confirmed by DMA, which enhanced deformational stress at definite elongation of the NR/PSF composites. The volume concentration of the MAA solution for grafting on the SF surface had a great influence on the interfacial bonding and mechanical properties of the composites; when the volume concentration was 30 %, the modified PSF-reinforced NR/CB had the best interfacial bonding and mechanical properties.
Zhi-hao Li,Shang Chu,Ping Wang,Sihai Gao,Shu-gang Li,Xiongwei Yu 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.9
This study examined the effects of differentdoses of irradiation treatments on protein structure anddigestion characteristic of seed-watermelon seed kernelprotein. The results showed that, the molecular structure ofseed-watermelon kernel protein was unfolded after theirradiation treatment, the content of b-sheet structure in thesecondary structure was decreased, while the content ofrandom coil structure increased. The average particle sizeof the protein increased, and the hydrophobic group buriedin the b-sheet structure was exposed hence the surfacehydrophobicity increased. Besides, the surface morphologyof seed-watermelon protein changed from smooth and flatto coarse and concave, the specific surface area in contactwith the aqueous medium increased and its solubilityincreased, the distribution of peptides in the digestabecame wider, and the small molecular weight peptidesgradually increased.