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RISS 인기검색어
- 검색키워드
- 저자 : Zhihui Niu (검색결과 4 건)
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A novel numerical approach for workspace determination of parallel mechanisms
Yiqun Zhou,Junchuan Niu,Zhihui Liu,Fuliang Zhang 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.6
In this paper, a novel numerical approach is proposed for workspace determination of parallel mechanisms. Compared with the classicalnumerical approaches, this presented approach discretizes both location and orientation of the mechanism simultaneously, not onlyone of the two. This technique makes the presented numerical approach applicable in determining almost all types of workspaces, whiletraditional numerical approaches are only applicable in determining the constant orientation workspace and orientation workspace. Thepresented approach and its steps to determine the inclusive orientation workspace and total orientation workspace are described in detail. A lower-mobility parallel mechanism and a six-degrees-of-freedom Stewart platform are set as examples, the workspaces of thesemechanisms are estimated and visualized by the proposed numerical approach. Furthermore, the efficiency of the presented approach isdiscussed. The examples show that the presented approach is applicable in determining the inclusive orientation workspace and totalorientation workspace of parallel mechanisms with high efficiency.
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Sun, Hao,Chen, Zhihui,Ma, Chengzhan,Lian, Lina,Zhao, Zeyu,Niu, Shupeng,Xu, Liangmei,Sun, Jinhua Asian Australasian Association of Animal Productio 2022 Animal Bioscience Vol.35 No.5
Objective: The objective of this study was to investigate the effects of different degrees of maternal dietary energy restriction on lipid deposition in embryonic tissues during the medium laying period (37 to 39 weeks) in Arbor Acres (AA) broiler breeders. Methods: A single factor design was adopted, and 400 AA broiler breeders (20 weeks of age) with a similar weight were randomly allocated into four groups. The birds in the control group were fed a corn-soybean meal based diet, and those in trial groups were fed diets with 80%, 70%, and 50% energy levels of the basal diet. Incubated eggs from the medium laying period were collected. Samples of developing embryos at various stages were prepared for composition analysis. Results: The embryo weight in the 80% energy group was higher than those of the other groups on embryonic day (E) 13, but at 21 E, they were significantly decreased with decreasing energy intake of the broiler breeders (p<0.05). Additionally, the levels of crude fat in tissues in the restriction groups were significantly decreased (p<0.05). The long axis and area of adipocytes in breast muscle, thigh muscle and the liver were significantly decreased (p<0.05) at 21 E in the 80%, 70%, and 50% energy groups. Conclusion: The effects of the 80% maternal dietary energy restriction energy affects egg production performance, egg quality, and nutrient deposition in egg weights, which then directly impacts on the developmental process of embryos, especially on fat utilization and deposition.
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Yuan Gao,Yubin Ji,Fuling Wang,Wenlan Li,Xiaomeng Zhang,Zhihui Niu,Zhuo Wang 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.13
Blueberry residue is usually discarded as waste,but has a high anthocyanins content. The extraction methodof anthocyanins from blueberry residue with ultrasonicassisted dual-aqueous phase system was optimized. Interms of the principle of central group and design (CCD)experimental design, three-factor and five-level responsesurface analysis was adopted to optimize the extractionconditions with the extraction rate of anthocyanins. Theoptimum extraction rate of anthocyanin was12.372 ± 0.078 mg/g. Anthocyanin extract could protectthe pBR322 DNA oxidative damage induced by Fentonreagent, increase the superoxide dismutase(SOD) and glutathioneperoxidase (GSH-Px) enzyme activities, anddecrease the H2O2-induced cell apoptosis of human normalliver cell (LO2 cell). The study indicates that the extractionrate of anthocyanin was increased by optimized ultrasonicassisted dual-aqueous phase system. The anthocyaninextract could protect DNA and LO2 cell from oxidativedamage.
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Yuan Gao,Yubin Ji,Wenlan Li,Fuling Wang,Fuling Wang,Xiaomeng Zhang,Zhihui Niu,Lulu Zhou,Lijun Yan 한국식품영양과학회 2021 Journal of medicinal food Vol.24 No.2
This study focused on the antibacterial effects of the endophytic fungi producing naringenin from Dalbergia odorifera T. Chen against Staphylococcus aureus. The antibacterial activity was measured by the inhibition diameters, minimum inhibitory concentration (MIC), and minimum bactericidal concentration (MBC). The time-killing curve was also used to evaluate its antibacterial efficacy. The results of antibacterial activity determinations showed that endophytic fungi secondary metabolites can inhibit the growth of five pathogenic bacteria (S. aureus, Escherichia coli, Salmonella enteritidis, Pseudomonas aeruginosa, and Bacillus subtilis) and the most sensitive strain was S. aureus that had the MIC and MBC values of 0.13 and 0.50 mg/mL, respectively. The membrane permeability study was measured by a DNA leakage assay and electrical conductivity assay. Furthermore, the whole-cell protein lysates and DNA fragmentation assay was evaluated. The morphology of S. aureus treated with the endophytic fungi products was observed by scanning electron microscopy (SEM). The probable antibacterial mechanism of endophytic fungi secondary metabolites was the increased membrane permeability that leads to leaks of nucleic acids and proteins. SEM results further confirmed that the extracts can interfere with the integrity of S. aureus cell membrane and further inhibit the growth of bacteria, resulting in the death of bacteria. This study provides a new perspective for the antibacterial functions of endophytic fungi secondary metabolites for biomedical applications.
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