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Desheng Zhang,Lei Shi,Ruijie Zhao,Wei-dong Shi,Qiang Pan,B. P. M. (Bart) van Esch 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.2
The aim of the present investigation is to simulate and analyze the tip leakage flow structure and instantaneous evolution of tip vortex cavitation in a scaled axial-flow pump model. The improved filter-based turbulence model based on the density correction and a homogeneous cavitation model were used for implementing this work. The results show that when entering into the tip clearance, the backward flow separates from the blade tip near the pressure side, resulting in the generation of a corner vortex with high magnitude of turbulence kinetic energy. Then, at the exit of the tip clearance, the leakage jets would re-attach on the blade tip wall. Moreover, the maximum swirling strength method was employed in identifying the TLV core and a counter-rotating induced vortex near the end-wall successfully. The threedimensional cavitation patterns and in-plain cavitation structures obtained by the improved numerical method agree well with the experimental results. At the sheet cavitation trailing edge in the tip region, the perpendicular cavitation cloud induced by TLV sheds and migrates toward the pressure side of the neighboring blade. During its migration, it breaks down abruptly and generates a large number of smallscale cavities, leading to severe degradation of the pump performance, which is similar with the phenomenon observed by Tan et al. [35].
ATTRACTORS OF LOCAL SEMIFLOWS ON TOPOLOGICAL SPACES
Desheng Li,Jintao Wang,Youbing Xiong 대한수학회 2017 대한수학회지 Vol.54 No.3
In this paper we introduce a notion of an attractor for local semiflows on topological spaces, which in some cases seems to be more suitable than the existing ones in the literature. Based on this notion we develop a basic attractor theory on topological spaces under appropriate separation axioms. First, we discuss fundamental properties of attractors such as maximality and stability and establish some existence results. Then, we give a converse Lyapunov theorem. Finally, the Morse decomposition of attractors is also addressed.
Desheng Xi,Xiaojuan Deng,Huijun Li,Pei Yao 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.8
Allura red (AR) is a water-soluble synthetic colorant often used as an additive in the food industry, but excess AR can be harmful to human health. In this work, we report the development of a new removal method for AR by using amino-functionalized microspheres with Fe3O4 cores and twolayer shells composed of SiO2 particles and perpendicularly aligned mesoporous SiO2 (designated Fe3O4@nSiO2@mSiO2–NH2). The material exhibits good dispersibility in aqueous solutions and a high saturation magnetization of 45.68 emu g-1, and can be magnetically separated efficiently with an external magnet. Importantly, the material has great adsorption capacity of 29.6 mg g-1 for AR and the capacity for reuse with a simple treatment. The adsorption process is very fast and the kinetics data are consistent with a pseudo-second order model. Based on these, a rapid and efficient method for extraction and analysis of AR in water and soft drinks has been established.
Diphenyl derivatives from coastal saline soil fungus Aspergillus iizukae
Desheng Liu,Ling Yan,Liying Ma,Yuling Huang,Xiaohong Pan,Weizhong Liu,Zhihua Lv 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.6
Two new diphenyl derivatives, named iizukinesA (1) and B (2), along with nine known compounds wereisolated from coastal saline soil derived fungus Aspergillusiizukae. The structures were determined by extensivespectroscopic analysis. Their cytotoxicities were preliminarilyevaluated on HL-60, BEL-7402 and A-549 cell linesby the MTT assay.
학술 7 특별구두세션 : PA. 포스터세션 1 ; 패스트푸드 산업에서 시장지향성이 경영성과에 미치는 영향 -중국 패스트푸드 근무 종사자를 중심으로-
갈덕성 ( Desheng Ge ),김계수 ( Gye Soo Kim ),오승조 ( Seung Jo Oh ) 한국품질경영학회 2014 한국품질경영학회 학술대회 Vol.2014 No.2
1. 목적 · 중국패스트푸드산업의 경영성과 관련 연구모형 · 중국 패스트푸드 근무 종사자 대상 구조방정식 모형 분석 후 시사점 제공 · 실무분야 종사자에 대한 시사점 제공 2. 연구 설계/ 방법론/ 접근방법 · 연구모델 구축 후 중국 패스트푸드 종업원(n=210) 설문조사를 통한 모형의 적합성 판단 · 시장지향성이 경영성과에 미치는 영향 요인분석 · 전략적인 시사점 도출 3. 연구결과 · 분석결과 경쟁자 중심의 경영활동은 기업혁신과 종업원만족에 유의한 영향을 미침 · 종업원 만족은 기업성과에 유의한 영향을 미침 4. 실무적 시사점 · 경쟁자 중심의 경영활동이 중요함을 실증분석함 · 종업원만족 요인은 경쟁자 중심활동과 경영성과요인 사이에서 매개요인 역할을 함 5. 독창성/ 가치 · 중국 패스트푸드 업계관련 경쟁력 모형 도출 · 중국 패스트푸드 종업원 대상으로 한 실증분석
Synthesis of Ni Nanopowders Using an EHA System
Ai, Desheng,Kang, Shinhoo The Japan Institute of Metals 2006 Materials transactions Vol.47 No.8
<P>Nickel nanopowders were synthesized using an ethylene glycol-hydrazine-ammonia (EHA) system. Based on X-ray diffraction data, the resulting powders were identified as pure crystalline nickel with an average crystal size of ∼20 nm. The mean diameter of the Ni powders decreased as the amount of hydrazine used was increased. A small amount of an AgNO<SUB>3</SUB> solution, a nucleating agent, was found to facilitate the formation of the nanopowders. Ethylene glycol was found to be effective in preventing the nanopowders from becoming agglomerated.</P>
Design and Optimization for the Windowless Target of the China Nuclear Waste Transmutation Reactor
Cheng, Desheng,Wang, Weihua,Yang, Shijun,Deng, Haifei,Wang, Rongfei,Wang, Binjun Korean Nuclear Society 2016 Nuclear Engineering and Technology Vol.48 No.2
A windowless spallation target can provide a neutron source and maintain neutron chain reaction for a subcritical reactor, and is a key component of China's nuclear waste transmutation of coupling accelerator and subcritical reactor. The main issue of the windowless target design is to form a stable and controllable free surface that can ensure that energy spectrum distribution is acquired for the neutron physical design when the high energy proton beam beats the lead-bismuth eutectic in the spallation target area. In this study, morphology and flow characteristics of the free surface of the windowless target were analyzed through the volume of fluid model using computational fluid dynamics simulation, and the results show that the outlet cross section size of the target is the key to form a stable and controllable free surface, as well as the outlet with an arc transition. The optimization parameter of the target design, in which the radius of outlet cross section is $60{\pm}1mm$, is verified to form a stable and controllable free surface and to reduce the formation of air bubbles. This work can function as a reference for carrying out engineering design of windowless target and for verification experiments.