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Sui Congbiao,de Vos Peter,Stapersma Douwe,Visser Klaas,Hopman Hans,Ding Yu 대한조선학회 2022 International Journal of Naval Architecture and Oc Vol.14 No.1
Analysis of ship propulsion system performance is often performed using detailed hydrodynamic models to assess load changes, which are subsequently compared to static engine limits, or by detailed engine models that are rarely integrated with sufficiently detailed propulsion models for load change estimation. To investigate the dynamic engine (overloading) behaviour and ship propulsion performance under various heavy operating conditions, a Mean Value First Principle Parametric (MVFPP) engine model is integrated into a ship propulsion system model in this paper. An upgraded thermodynamic-based MVFPP model for two-stroke marine diesel engines is presented, in particular a newly developed MVFPP gas exchange model. Based on the integrated propulsion system model of a benchmark ocean-going chemical tanker, the engine dynamic behaviour during ship acceleration, deceleration and crash stop has been investigated. Results show that, during dynamic processes, the engine could be thermally overloaded even if the engine power trajectory is inside the static engine operating envelope. The paper contributes to finding proper indicators for thermal overloading of modern two-stroke marine diesel engines. It is demonstrated that when matching the engine with the propeller and designing the ship propulsion control system, not only the static engine operating envelope, but also the dynamic engine behaviour should be considered.
Sui, M.,Pandey, P.,Li, M.Y.,Zhang, Q.,Kunwar, S.,Lee, J. New York] ; North-Holland 2017 APPLIED SURFACE SCIENCE - Vol.393 No.-
Nanoscale patterning of sapphires is a challenging task due to the high mechanical strength, chemical stability as well as thermal durability. In this paper, we demonstrate a gold droplet assisted approach of nano-hole fabrication on c-plane sapphire via a thermal treatment. Uniformly distributed nano-holes are fabricated on the sapphire surface guided by dome shaped Au nanoparticles (NPs) as catalysts and the patterning process is discussed based on the disequilibrium of vapor, liquid, solid interface energies at the Au NP/sapphire interface induced by the Au evaporation at high temperature. Followed by the re-equilibration of interface energy, transport of alumina from the beneath of NPs to the sapphire surface can occur along the NP/sapphire interface resulting in the formation of nano-holes. The fabrication of nano-holes using Au NPs as catalysts is a flexible, economical and convenient approach and can find applications in various optoelectronics.
Sui Kiat Chang,Hiroshi Hamajima,Amin Ismail,Teruyoshi Yanagita,Norhaizan Mohd. Esa,Mohamad Taufik Hidayat Baharuldin 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.4
This study aimed to determine the lipid-loweringproperties, antioxidant capacity (AC) and angiotensin-Iconverting enzyme (ACE)-inhibitory activity of oil palmkernel protein hydrolysates (OPKHs) that were producedusing protease and pepsin-pancreatin hydrolysis. Theeffects of the OPKHs on apolipoprotein B (apoB) secretionwas assessed using HepG2 cells as a model and the AC ofthe OPKHs was determined based on ABTS radicalscavenging activity and ferric reducing antioxidant power(FRAP). Both protease and pepsin-pancreatin hydrolysatesreduced apoB secretion significantly (p<0.05). The OPKHsscavenged ABTS radicals effectively and demonstrated ahigh reducing power even at a low concentration (1 mg/mL). The AC of the OPKHs was significantly correlatedwith the OPKHs protein content. However, the OPKHsdemonstrated very low ACE-inhibitory activity. The pepsinpancreatinhydrolysate demonstrated significant lipidloweringproperties, favourable AC and ACE inhibitoryactivity in compared to protease hydrolysate. Therefore,OPKH demonstrate the potential as a nutraceutical forfunctional foods.
Enhanced β-carotene production by Rhodotorula glutinis using high hydrostatic pressure
Sui-Lou Wang,Jun-She Sun,Bei-Zhong Han,Xiao-Zong Wu 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.3
High hydrostatic pressure (HHP) technology was used for improving the ability of β-carotene biosynthesis of Rhodotorula glutinis R68. After the treatments of five repeated cycles at 300MPa for 15 min, the barotolerant mutant PR68 was obtained. After 72 h of culture, the biomass of mutant PR68 was 21.6 g/L, decreased by 8.5% compared to the parent strain R68, but its β-carotene production reached 19.4 mg/L, increased by 52.8% compared to the parent strain R68. The result of restriction fragment length polymorphism analysis suggested that mutant strain PR68 was likely to change in nucleic acid level, and thus enhanced β-carotene production in this strain was a result of gene mutation induced by HHP treatment. HHP technology seems a promising approach for improving industrial microbes
Temperature-Dependent Structural and Transport Properties of Liquid Transition Metals
Sui Yang,Xuping Su,Jianhua Wang,Nai-Yong Tang 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.6
The evolution of the atomic structures and diffusivity of liquid transition metals with increasing temperature has been studied here using molecular dynamics. An analysis of Honeycutt and Andersen (HA) Indices indicates that relatively low order atomic clusters of rhombohedra-related structures increase with an increase in temperature. The results illustrate that the distortion in the local structural order with a predominant rhombohedra character enhances the diffusivity in liquid metals. The excess entropy approximated by the two-body contribution increases with the distortion of the local structural order traced by the HA Indices. The relationship between the excess entropy and the reduced diffusion coefficient supports the universal scaling law proposed by M. Dzugutov. The calculated diffusivities were compared with predictions of four diffusion models. The temperature dependence of the diffusivity cannot be described by the Arrhenius Law, the moving oscillator model or the free volume model but rather by the density fluctuation model with the square proportionality of temperature.
An Improved Modulation Scheme for Voltage Balancing in Modular Multilevel Converter
Sui, Shunke,Yang, Rongfeng,Xu, Dianguo The Korean Institute of Electrical Engineers 2014 The Journal of International Council on Electrical Vol.4 No.2
With the continuous development of power electronic technology toward the high voltage and high-power conversion, the Modular Multilevel Converter (MMC) has attracted research attention. Since a large number of capacitors, voltage balancing problem becomes one of the key technologies of the MMC. To resolve the voltage balancing problem, this paper presents a novel voltage balancing modulation scheme, which control the instantaneous power of each sub-module timely by adjusting carriers offset in PWM, and the respective capacitor voltage could be stabilized at a set value. Simulation results based on MATLAB / SIMULINK environment are provided to testify to the effectiveness of the proposed method.