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Slider Crank Mechanism Design with Time Ratio and Minimum Transmission Angle
Han Jiguang,Zhang Chuanyan,Zuo Weiyang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.11
The size parameters of slider crank mechanism are directly treated as design variable. The analytical synthesis method of the mechanism with time ratio and the selecting range of design variable are presented. The mechanism synthesis method which simultaneously satisfies the conditions of time ratio and minimum transmission angle is presented. The synthesis problem of the slider crank mechanism, which makes it have maximum minimum transmission angle when time ratio is given, is completely solved. This method can not only judge the feasibility of mechanism synthesis, but also determine the parameters of mechanism one time. The ite
Analysis and Synthesis of the In-line Slider-Elliptic Crank Dwell Mechanism
Han Jiguang,Zhang Chuanyan,Zuo Weiyang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.10
Elliptic crank is a planet mechanism which is able to generate elliptic curve, with elliptic crank as the driven crank of slider-crank mechanism is equal to the mechanism which has a variable length and a variable speed along the elliptical moving crank, which changed the kinematic characteristics of the slider. This paper studies the motion characteristics of the in-line slider- elliptic crank mechanism. A slider mechanism, which has approximate dwell characteristics at the limit position, is proposed. The analysis and synthesis method of the mechanism was presented. The effect on dwell performance of mechanism parameters was analyzed. The adjusting method of the dwell range was put forward. In the end, the design example was given.
Processing, digestion property and structure characterization of slowly digestible gorgon nut starch
Jia-cheng Zeng,Pin-Jian Xiao,Li-Juan Ling,Li Zhang,Dao-Bang Tang,Qing-Feng Zhang,Jiguang Chen,Jing-En Li,Zhongping Yin 한국식품과학회 2022 Food Science and Biotechnology Vol.31 No.1
Slowly digestible gorgon nut starch (GN-SDS) was prepared by heating–cooling treatment (HCT), meanwhile its morphological and structural features were characterized in detail by SEM, DSC, XRD and IR detection. The optimized parameters of GN-SDS processing were as following: starch milk (20%) was heated at 100 °C for 20 min, and then cooled under 4 °C for 24 h. Under the optimized parameters, the SDS content increased from 20.49 to 61.74%. GN-SDS showed typical SDS characteristics in in vivo digestion with a low postprandial blood glucose. SEM images suggested that GN-S particles changed from uniform regular polyhedron with smooth surface to irregular gravel-like particles with coarse surface and obvious layered structure inside after HCT. The results of SEM, DSC, XRD and IR determination indicated that HCT changed the granule morphology, interior structure, gelatinization temperature and crystal type (A to B-type) of GN-S, and therefore made it hard to be digested accordingly.
Yan-Ping Li,Dao-Bang Tang,Xiao-Qiang Wang,Meng Wang,Qing-Feng Zhang,Yuan Liu,Bei-Yun Shen,Jiguang Chen,Zhongping Yin 한국생물공학회 2021 Biotechnology and Bioprocess Engineering Vol.26 No.3
Three types of calli were induced from Origanum vulgare (O. vulgare) aseptic seedlings, and the friable calli with white appearance and high growth rate were further screened and used to develop cell suspension culture to produce polyphenols. Murashige and Skoog (MS) medium with 3.0 mg/L Kinetin (KT) and 0.5 mg/L 2,4-dichlorophenoxy acetic acid (2,4-D) was suitable for both O. vulgare cells growth and polyphenols accumulation. To further enhance the polyphenols accumulation, O. vulgare cells were treated by phenylalanine (Phe) feeding and salicylic acid (SA) elicitation. Compared with the individual Phe feeding and SA elicitation, SA elicitation combined with Phe feeding showed a much better promotion effect on the polyphenols synthesis in O. vulgare cells, especially rosmarinic acid (RosA) accumulation. With the combined treatment of 200 μM SA and 100 μM Phe, total polyphenols content and yield were 41.36 mg/g and 752.93 mg/L, respectively. RosA content and yield reached 31.25 mg/g and 570.37 mg/L, which were 5.44 and 5.47 times that of the control. Furthermore, the total polyphenols extracted from the cultured cells treated by SA elicitation combined with Phe feeding displayed a much higher antioxidant capacity than that of untreated cells, meanwhile its 1,1-diphenyl-2- trinitrophenyl hydrazine (DPPH) and superoxide anion radical-scavenging activity were much stronger than that of vitamin C. What’s more, our results also showed that RosA was the principal contributor to the fine antioxidant capacity of the total polyphenols extracted from the SA and Phe treated cells. Our research indicated that SA elicitation combined with Phe feeding significantly improved the polyphenols yield and antioxidant capacity of the cultured O. vulgare cells, and therefore has a promising application prospect in natural polyphenols production.