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Experimental study on wave motion of partial air cushion supported catamaran
Jinglei Yang,Hanbing Sun,Xiaowen Li,Defeng Wu 대한조선학회 2023 International Journal of Naval Architecture and Oc Vol.15 No.-
To study the performance of partial air cushion-supported catamaran (PACSCAT), which is sailing with a flexible air seal in waves, this paper uses the model tests, and research the motion characteristics of PACSCAT at different wavelengths, by monitoring the boundaries of heave, pitch, acceleration, air cushion pressure. Firstly this paper introduces the test situation of PACSCAT in the towing tank and introduces the test method, equipment, and test conditions. Second, this paper extracts the test data, analyzes the features of heave, pitch, acceleration, and air cushion pressure, and studies their linear and nonlinear changes in regular waves. Thirdly this paper analyzes the nonlinear air leakage flow of the bow of PACSCAT in detail under the test conditions and studies the internal and external free liquid surface under different conditions.
Jiang, Li,Sun, Yao,Su, Mei,Wang, Hui,Dan, Hanbing The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.1
It is usually difficult for dual-active-bridge (DAB) dc-dc converters to operate efficiently at light loads. This paper presents an in-depth analysis of a DAB with triple-phase-shift (TPS) control under the light load condition to overcome this problem. A kind of operating mode which is suitable for light load operation is analyzed in this paper. First, an analysis of the zero-voltage-switching (ZVS) constraints for the DAB converter has been carried out and a reasonable dead-band setting method has been proposed. Secondly, the basic operating characteristics of the converter are analyzed. Third, under the condition of satisfying the ZVS constraints, both the reactive power and the root mean square (RMS) value of the current are simultaneously minimized and a particle swarm optimization (PSO) algorithm is employed to analyze and solve this optimization problem. Lastly, both simulations and experiments are carried out to verify the effectiveness of the proposed method. The experimental results show that the converter can effectively achieve ZVS and improved efficiency.
Bi Hongxia,Sun Xingyuan,Shi Hanbing,Ou Zhimin 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.1
Tert-butyl (3R,5S)-6-chloro-3,5-dihydroxyhexanoate was synthesized using asymmetric reduction of tertbutyl (S)-6-chloro-5-hydroxy-3-oxo-hexanoate with liquid-core immobilized Saccharomyces cerevisiae CGMCC No. 2233. The optimum conditions for preparation of the liquid-core immobilized cells were found to be 2% guar gum,5% CaCl2, 0.8% sodium alginate, capsule diameter 2mm, 0.3% chitosan (1.0×105) solution, and 30 min for formation of the film of liquid-core immobilized cells. The optimum re-cultivation time was 32 h. The optimum reduction conditions were found to be pH 6.8-7.2, 160 r/min, and 30 oC. Conversion was found to reach 100% when initial concentration of substrate was less than 50 g/L. The diastereomeric excess of tert-butyl (3R,5S)-6-chloro-3,5-dihydroxyhexanoate exceeded 99%. The liquid-core immobilized cells retained their effectiveness even after 15 uses.
Li Jiang,Yao Sun,Mei Su,Hui Wang,Hanbing Dan 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.1
It is usually difficult for dual-active-bridge (DAB) dc-dc converters to operate efficiently at light loads. This paper presents an in-depth analysis of a DAB with triple-phase-shift (TPS) control under the light load condition to overcome this problem. A kind of operating mode which is suitable for light load operation is analyzed in this paper. First, an analysis of the zero-voltage-switching (ZVS) constraints for the DAB converter has been carried out and a reasonable dead-band setting method has been proposed. Secondly, the basic operating characteristics of the converter are analyzed. Third, under the condition of satisfying the ZVS constraints, both the reactive power and the root mean square (RMS) value of the current are simultaneously minimized and a particle swarm optimization (PSO) algorithm is employed to analyze and solve this optimization problem. Lastly, both simulations and experiments are carried out to verify the effectiveness of the proposed method. The experimental results show that the converter can effectively achieve ZVS and improved efficiency.
Zhimin Ou,Xiaoyan Chen,Guoqing Ying,Hanbing Shi,Xingyuan Sun 한국생물공학회 2011 Biotechnology and Bioprocess Engineering Vol.16 No.2
In this study, (S)-3-hydroxy-3-phenylpropionate was prepared continuously by coupling microbial transformation and membrane separation. The effect of several factors on membrane flux, reactor capacity, and reaction conversion were investigated. A kinetic model of the continuous reduction process was also developed. The appropriate molecular weight cut-off of the ultrafiltration membrane was 30 kDa. The reactor capacity reached a maximum of 0.136/h at a biomass concentration and membrane flux of 86 g/L (dry weight/reaction volume) and 20 mL/h, respectively. The (S)-3-hydroxy-3-phenylpropionate yield was 3.68 mmol/L/day after continuous reduction over seven days. The enantiometric excess of (S)-3-hydroxy-3-phenylpropionate reached above 99.5%. The kinetic constants of continuous reduction were as follows:r_m = 3.00 × 10^(−3) mol/L/h, k_(cat) = 3.49 × 10^(−4) mol/L/h, k_1 =3.09 × 10^(−2) mol/L, and k_2 = 5.00 × 10^(−7) mol/L. The kinetic model was in good agreement with the experimental data obtained during continuous reduction. Compared with batch reduction, continuous reduction can significantly improve the catalytic efficiency of microbial cells and increase the reactor capacity.
Efficient Mean-Shift Tracking Using an Improved Weighted Histogram Scheme
( Dejun Wang ),( Kai Chen ),( Weiping Sun ),( Shengsheng Yu ),( Hanbing Wang ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.6
An improved Mean-Shift (MS) tracker called joint CB-LBWH, which uses a combined weighted-histogram scheme of CBWH (Corrected Background-Weighted Histogram) and LBWH (likelihood-based Background-Weighted Histogram), is presented. Joint CB-LBWH is based on the notion that target representation employs both feature saliency and confidence to form a compound weighted histogram criterion. As the more prominent and confident features mean more significant for tracking the target, the tuned histogram by joint CB-LBWH can reduce the interference of background in target localization effectively. Comparative experimental results show that the proposed joint CB-LBWH scheme can significantly improve the efficiency and robustness of MS tracker when heavy occlusions and complex scenes exist.
Yuan Lu,Hongqian Dai,Pengpeng Cheng,Hanbing Shi,Lan Tang,Xingyuan Sun,Zhimin Ou 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.5
A modular approach was applied for the synthesis of bienzyme-polymer nanoconjugates (nano-BECs) (50- 70 nm) consisting of two enzymes (carbonyl reductase and glucose dehydrogenase) conjugated within a single universal polymer scaffold. The amount of the product ethyl (R)-2-hydroxy-4-phenylbutyrate (R-HPBE) with nano-BECs as the catalyst was 533mM in a dibutyl phthalate-phosphate buffer (dibutyl phthalate-PB) biphasic system, while the amount of R-HPBE was 349mM using carbonyl reductase-poly(acrylic acid) as the catalyst, indicating that the nano- BECs have an advantage for coenzyme regeneration. Compared with a single aqueous phase, the substrate treatment capacity was improved at the interface of the dibutyl phthalate-PB biphasic system. Under the optimal reaction conditions (35 oC, 40 h, dibutyl phthalate-PB 1 : 1), nano-BECs can completely convert substrate into optically pure R-HPBE (enantiomeric excess (e.e.) >99.9%) in the organic-aqueous system.
Yang, Jinglei,Lin, Zhuang,Li, Ping,Guo, Zhiqun,Sun, Hanbing,Yang, Dongmei The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.1
The partial air cushion supported catamaran (PACSCAT) is a novel Surface Effect Ship (SES) and possesses distinctive resistance performance due to the presence of planing bottom. In this paper, the design of PACSCAT and air cushion system are described in detail. Model tests were carried out for Froude numbers ranging from 0.1 to 1.11, the focus is on the influence of air cushion system on resistance characteristics. Drag-reducing effect of air cushion system was proved by means of contrast tests in cuhionborne and non-cushionborne mode. Wave-making characteristics reflect that the PACSCAT would eventually enter planing regime, in which the air could just escape under the seals and the hull body could operate in a steady state. To acquire different air cushion pressure, air flow rate and leakage height were adjusted during tests. Experimental results show that the resistance performance in planing regime would decrease evidently as the increased air flow rate, however, the scheme with medium leakage height presents the best resistance performance in the hump region.
Yang, Jinglei,Lin, Zhuang,Li, Ping,Guo, Zhiqun,Sun, Hanbing,Yang, Dongmei The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.-
The partial air cushion supported catamaran (PACSCAT) is a novel Surface Effect Ship (SES) and possesses distinctive resistance performance due to the presence of planing bottom. In this paper, the design of PACSCAT and air cushion system are described in detail. Model tests were carried out for Froude numbers ranging from 0.1 to 1.11, the focus is on the influence of air cushion system on resistance characteristics. Drag-reducing effect of air cushion system was proved by means of contrast tests in cuhionborne and non-cushionborne mode. Wave-making characteristics reflect that the PACSCAT would eventually enter planing regime, in which the air could just escape under the seals and the hull body could operate in a steady state. To acquire different air cushion pressure, air flow rate and leakage height were adjusted during tests. Experimental results show that the resistance performance in planing regime would decrease evidently as the increased air flow rate, however, the scheme with medium leakage height presents the best resistance performance in the hump region.