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On the mitigation of surf-riding by adjusting center of buoyancy in design stage
Liwei Yu,Ning Ma,Xiechong Gu 대한조선학회 2017 International Journal of Naval Architecture and Oc Vol.9 No.3
High-speed vessels are prone to the surf-riding in adverse quartering seas. The possibility of mitigating the surf-riding of the ITTC A2 fishing vessel in the design stage is investigated using the 6-DOF weakly non-linear model developed for surf-riding simulations in quartering seas. The longitudinal position of the ship's center of buoyancy (LCB) is chosen as the design parameter. The adjusting of LCB is achieved by changing frame area curves, and hull surfaces are reconstructed accordingly using the Radial Basis Function (RBF). Surf-riding motions in regular following seas for cases with different LCBs and Froude numbers are simulated using the numerical model. Results show that the surf-riding cannot be prevented by the adjusting of LCB. However, it occurs with a higher threshold speed when ship's center of buoyancy (COB) is moved towards stem compared to moving towards stern, which is mainly due to the differences on wave resistance caused by the adjusting of LCB.
On the mitigation of surf-riding by adjusting center of buoyancy in design stage
Yu, Liwei,Ma, Ning,Gu, Xiechong The Society of Naval Architects of Korea 2017 International Journal of Naval Architecture and Oc Vol.9 No.3
High-speed vessels are prone to the surf-riding in adverse quartering seas. The possibility of mitigating the surf-riding of the ITTC A2 fishing vessel in the design stage is investigated using the 6-DOF weakly non-linear model developed for surf-riding simulations in quartering seas. The longitudinal position of the ship's center of buoyancy (LCB) is chosen as the design parameter. The adjusting of LCB is achieved by changing frame area curves, and hull surfaces are reconstructed accordingly using the Radial Basis Function (RBF). Surf-riding motions in regular following seas for cases with different LCBs and Froude numbers are simulated using the numerical model. Results show that the surf-riding cannot be prevented by the adjusting of LCB. However, it occurs with a higher threshold speed when ship's center of buoyancy (COB) is moved towards stem compared to moving towards stern, which is mainly due to the differences on wave resistance caused by the adjusting of LCB.
Li, Xiaolei,Wang, Yujuan,Park, Jong-Tae,Gu, Liwei,Li, Dan Elsevier 2018 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.107 No.1
<P><B>Abstract</B></P> <P>The most extremely thermostable maltogenic amylase (SMMA) from archaeon <I>Staphylothermus marinus</I> has many potential applications in food processing. To ensure safety of microbial origin, a recombinant plasmid containing the enzymic gene and a constitutive promoter AmyR2 was constructed, and then transformed into a GRAS microorganism <I>Bacillus subtilis</I>. The purified SMMA from the liquid cultures of <I>Bacillus</I> has a specific activity of 66.96U/mg, two times more than that from <I>Escherichia coli</I>. SMMA was further employed to catalyze the genistion glycosylation using γ-CD as both glucosyl donors and solubilizer. Glycosylated genistins with one to four additional α-glucosyls and a molar percentage of 69.87% in genistin reaction mixture were identified and quantified by HPLC–UV–MS. The glycosylated genistins at 0.2–1.2mM showed an enhanced DPPH free radical scavenging capacity. To our knowledge, this is the first report on the <I>Bacillus</I> expression of archaeal maltogenic amylase.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A fused gene of SMMA and a constitutive promoter AmyR2 was transformed into <I>B. subtilis</I>. </LI> <LI> Specific activity of purified SMMA from <I>B. subtilis</I> was two times more than that from <I>E. coli</I>. </LI> <LI> SMMA of safe microbial origin attached different number of glucosyls from γ-CD to genistin at 90°C. </LI> <LI> Glycosylated genistins showed an enhanced DPPH free radical scavenging capacity than genistin. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>