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RISS 인기검색어
- 검색키워드
- 저자 : Zhipeng Qiu (검색결과 4 건)
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Optimization of impulse water turbine based on GA-BP neural network arithmetic
Lingdi Tang,Shouqi Yuan,Yue Tang,Zhipeng Qiu 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.1
To develop an optimum design method for impulse water turbines with low specific speed, a representative impulse water turbine with low specific speed used in agricultural irrigation machinery was optimized with a combination of an orthogonal experimental design, a genetic algorithm, and a BP neural network in this study. Numerical calculation was applied to analyze interflow characteristics for optimized and original water turbines. Results showed that the internal flow characteristics of the optimized water turbine presented remarkable improvement compared with the original water turbine. Pressure distribution increased, the vortex strip in the draft tube was reduced remarkably, and impeller torque increased by 26 %. In addition, the optimized impeller was manufactured by 3D printing, and performance comparison was conducted between experiments of the optimized and original water turbines. The efficiency of the optimized water turbine reached 42.5 %, which exceeded the original water turbine’s of 8.5 %. With increasing rotating speed, maximum efficiency running point moved to a high flow rate, and highly efficient areas expanded. Internal characteristic analysis and a full-scale experiment for both water turbines showed that the performance of the optimized water turbine exhibited substantial improvement. The analysis and experiment also verified the theoretical correctness and feasibility of the proposed optimum design method.
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Photoluminescence properties of NaGd(WO_4)_2:Eu^3+ nanocrystalline prepared by hydrothermal method
Jinsheng Liao,Hangying You,Bao Qiu,He-Rui Wen,Ruijin Hong,Weixiong You,Zhipeng Xie 한국물리학회 2011 Current Applied Physics Vol.11 No.3
NaGd(WO_4)_2:Eu^3+ (hereafter NGW:Eu) red-phosphors were synthesized via a facile hydrothermal method at different pH value. X-ray power diffraction (XRD), transmission electron microscope (TEM),energy dispersive X-ray spectra (EDS), photoluminescence excitation and emission spectra and decay curve were used to characterize the NGW:Eu phosphors. It was found that the pH value has a crucial effect on synthesis of the scheelite structure NGW:Eu. The intense red emission is obtained by exciting into the 5^L_6 state with 395 nm, which corresponds to the popular emission line from near-UV LED chips. The values of Ω2,4 experimental intensity parameters (14.9 × 10^-20 and 5.6 × 10^-20 cm^2) are determined. The high emission quantum efficiency and suitable color coordination of the NGW:Eu phosphor suggest the material could be a promising red phosphor for generating white light in phosphor-converted white light emitting diodes (WLEDs).
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Experimental study on timing and pattern of gas injection in low permeability reservoir
Wei Huang,Shenglai Yang,Meng Chen,Zhipeng Qiu,Can Chen,Hao Chen 한국자원공학회 2014 Geosystem engineering Vol.17 No.3
Experiments were conducted to study the selection of development methods for low permeability reservoir exploitation after water drive, including the effects of different gas injection cycle times and different injection modes on oil displacement efficiency. Results showed that both gas injection cycle time and injection mode have significant effects on oil displacement efficiency. Based on the results of gas injection cycle time of the displacement with mode shifting to gas drive when water cut reaches 50% and 100%, it can be concluded that in the low permeability reservoir, which is exploited by water drive in the early time, the sooner the gas injection, the higher the oil displacement efficiency is. Because high water saturation can cause serious water-blocking effect, leading to a large amount of trapped oil and low displacement efficiency. Further, in view of the results of water drive, gas injection, and water alternating gas (WAG) flooding, it is obvious that WAG flooding is one of the best methods in enhanced oil recovery. Under the effect of gravity differentiation, WAG flooding can spread to the upper reservoir, which cannot be swept by water drive. Thus, the oil recovery factor can be improved effectively. However, it should be noted that gas injectivity should be considered in the field test.
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Haozhan Lia,Hongkang Wei,Huijuan Qiu,Yukang Wanga,Chang-an Wang,Zhipeng Xie 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.1
Sub-micron boron carbide powders were synthesized through a gas-solid reaction process using ZIF-8-derived nanoporouscarbon and boron oxide as raw materials. The effects of calcination temperature and atmosphere, amount of boron oxide, andgas-solid reaction apparatus on phase composition and morphology of the synthesized boron carbide powders were studied. The results show that, even with sufficient boron oxide addition, it is not feasible to obtain boron carbide powder of high purityin argon environment. Although vacuum environment can significantly improve the purity of the synthesized boron carbidepowder, there are a large number of large particles of step morphology in the synthesized boron carbide powder. The improvedgas-solid reaction apparatus can effectively impede the formation of boron carbide particles of step morphology. Nearlyspherical submicron boron carbide particles with a median particle size of 480 nm and good particle size consistency couldbe synthesized at 1600 °C with 0.3 g nanoporous carbon and 10 g B2O3 under vacuum by using the improved apparatus
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