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Bin Yang Wu,Qiang Zhan,Xiao Yang Yu,Wen Yu Gu,Min Zhang,Wanhua Su 한국자동차공학회 2018 International journal of automotive technology Vol.19 No.4
In-cylinder charge density at top dead center is an important parameter of diesel engines and is influenced by intake pressure, intake temperature, and compression ratio. The effects of charge density on fuel spray, combustion process, and emissions were investigated by using a constant volume bomb and a heavy-duty diesel engine. Spray development resistance increased with the increase of the charge density in the constant volume bomb. It was found that short spray penetration was accompanied by a large spray cone angle in the former stage with high charge density. However, the equivalence ratio was lowered and the degree of homogeneity of the mixture was increased in the later stage owing to the rapid interaction of fuel and gas at a high mixing rate. Combining the first law of thermodynamics and the second law of thermodynamics for analysis, as the charge density increased, the gross indicated thermal efficiency (ITEg) was improved. However, pumping loss had to be considered with higher charge density. Under this condition, the brake thermal efficiency (BTE) trend was increased initially and decreased subsequently. Under high-load operation (1200 r/min BMEP, 2.0 MPa), the minimum charge density value of 44.8 kg/m3 was found to be reasonable. This charge density was suitable for combustion and brought about minimum exhaust energy and trade-off emissions. Moreover, by analyzing two operation conditions in terms of the maximum BTE with the Miller and the conventional cycles, compression temperature and combustion temperature were reduced in the Miller cycle with the charge density 44.8 kg/m3. A high C p/C v could improve the cylinder exergy/power conversion process by its positive effect of increasing the specific heat ratio. Owing to the interaction between a high C p/C v and exergy loss to heat transfer, the condition with the minimal charge density could produce more piston work.
Wen Yang,Bin Xia,Jiacheng Lu,Peizhi Yang,Xiaobo Chen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.4
"Novel hierarchical porous NiMoS4 microspheres with high electrochemical performance was successfully prepared using a facile one-step hydrothermal method. The dual application of porous NiMoS4 microspheres in energy harvesting and storage (i.e., dye-sensitized solar cells (DSSCs) and supercapacitors (SCs), respectively) is explored. In contrast to NiS2 nanosheets, MoS2 nanosheets and Pt counter electrodes (CEs), the NiMoS4 microspheres CE demonstrated the lowest charge transfer resistance and highest electrocatalytic activity for the I3 - /I - redox couple reaction. The NiMoS4-based DSSC showed a higher power conversion efficiency (8.9%) even than that of Pt-based DSSC (8.7%) under simulated standard global AM 1.5G sunlight (100 mW cm -2). As an electroactive material for SCs, the assembled NiMoS4//AC asymmetric supercapacitor showed excellent specific capacitance (118.7 F g -1 at 1 Ag -1), high energy density of 42.2 Wh kg -1 (with a power density of 799.2 W kg -1), and superior cycling durability with a specific capacitance retention of 79.5% after 9000 cycles at 3 A g -1."
Han Bin,Zhu Xiaoliang,Yang Bao-Wen,Liu Aiguo,Xi Yanyan,Liu Lei,Liu Shenghui,Huang Junlin 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.10
Mixing Vane Grid (MVG) is one of the most important structures in fuel assembly due to its high performance in mixing the coolant and ultimately increasing Critical Heat Flux (CHF), which avoids the temperature rising suddenly of fuel rods. To evaluate the mixing performance of the MVG, a Total Diffusion Coefficient (TDC) mixing coefficient is defined in the subchannel analysis code. Conventionally, the TDC of the spacer grid is obtained from the combination of experiments and subchannel analysis. However, the processing of obtaining and determine a reasonable TDC is much challenging, it is affected by boundary conditions and MVG geometries. In is difficult to perform all the large and costing rod bundle tests. In this paper, the CFD method was applied in TDC analysis. A typical 5 5 MVG was simulated and validated to estimate the mixing performance of the MVG. The subchannel code was used to calculate the TDC. Firstly, the CFD method was validated from the aspect of pressure drop and lateral temperature distribution in the subchannels. Then the effect of boundary conditions including the inlet temperature, inlet velocities, heat flux ratio between hot and cold rods and the arrangement of hot and cold rods on MVG mixing and TDC were studied. The geometric effects on mixing are also carried out in this paper. The effect of vane pattern on mixing was investigated to determine which one is the best to represent the grid's mixing performance.
Chia-Bin Lyu,Wen-Ju Yang,Kuo-Tan Li 한국원예학회 2014 Horticulture, Environment, and Biotechnology Vol.55 No.5
Removing runners and old leaves are two major routine and labor consuming tasks in winter strawberry(Fragaria × ananassa Duch.) production in subtropics. However, the potential negative effects of defoliation has notbeen evaluated. We studied the effects of partial defoliation and runner removal on plant growth, leaf photosynthesis(Pn), and yield in field-grown or potted strawberry plants (‘Toyonoka’). The treatments were consisted of partialdefoliation by removing leaves older than 45 days (PD), removing all runners (DR), PD + DR, and the control(CK). Treatments were applied weekly from mid-November until early March. DR promoted yield and number offruits for the first harvest cycle but not for the second harvest cycle. Multiple linear regressions indicated that leafarea had greater overall effects on runnering and fruit traits than the existence of runners. The leaf Pn was notresponsive to DR but a transient increase in Pn was consistently detected on the remaining leaf after each PD treatment. The compensatory increase in Pn was only detectable within 1 days after each PD treatment, indicating that theactual compensation for partial loss of functioning leaf area may be negligible. Crown dry weight was less affectedby canopy manipulation than growth and dry weight of roots. Our results indicated that yield of strawberry inTaiwan’s subtropical climate can be improved by removing runners while maintaining a greater leaf area with lesssevere defoliation.
Study on economic performances of multi-span suspension bridges part 1: simple estimation formulas
Li-wen Zhang,Ru-cheng Xiao,Bin Sun,Yang Jiang,Xue-yi Zhang,Dong-li Zhuang,Yun-gang Zhou,Xue Tu 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.47 No.2
A study on economic performances of consecutive multi-span suspension bridges is carried out. In this part of the study, material amount and structural cost estimation formulas of the bridges is derived based on the structural ultimate carrying capacity. The bridge cost includes the part of superstructure and the part of substructure. Three types of bridge foundations, bored piles, concrete caissons and floating foundations, are considered in substructure. These formulas are to be used for the parametric study of the bridge cost in order to define its more economical layout under different conditions in the part two of the study.
Yin Bin Chen,Yu Fang Wang,Wei Hou,Ying-Ping Wang,Sheng-Yuan Xiao,Yang Yang Fu,Jia Wang,Si Wen Zheng,Pei-He Zheng 고려인삼학회 2017 Journal of Ginseng Research Vol.41 No.2
Background: Both ginsenoside Re and B-complex vitamins are widely used as nutritional supplements. They are often taken together so as to fully utilize their antifatigue and refreshing effects, respectively. Whether actually a drugenutrient interaction exists between ginsenoside Re and B-complex vitamins is still unknown. The objective of this study was to simultaneously investigate the effect of B-complex vitamins on the antifatigue activity and bioavailability of ginsenoside Re after their oral administration. The study results will provide valuable theoretical guidance for the combined utilization of ginseng and B-complex vitamins. Methods: Ginsenoside Re with or without B-complex vitamins was orally administered to mice to evaluate its antifatigue effects and to rats to evaluate its bioavailability. The antifatigue activity was evaluated by the weight-loaded swimming test and biochemical parameters, including hepatic glycogen, plasma urea nitrogen, and blood lactic acid. The concentration of ginsenoside Re in plasma was determined by liquid chromatographyetandem mass spectrometry. Results: No antifatigue effect of ginsenoside Re was noted when ginsenoside Re in combination with Bcomplex vitamins was orally administered to mice. B-complex vitamins caused to a reduction in the bioavailability of ginsenoside Re with the area under the concentrationetime curve from zero to infinity markedly decreasing from 11,830.85 2,366.47 h$ng/mL to 890.55 372.94 h$ng/mL. Conclusion: The results suggested that there were pharmacokinetic and pharmacodynamic drugenutrient interactions between ginsenoside Re and B-complex vitamins. B-complex vitamins can significantly weaken the antifatigue effect and decrease the bioavailability of ginsenoside Re when simultaneously administered orally.
Barrier Function Based Adaptive Global Sliding Mode Fault-tolerant Control of Quad-rotor UAV
Pu Yang,Peng Liu,HuiLin Geng,ChenWan Wen,Bin Jiang 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.3
In this paper, Barrier function based adaptive global sliding mode fault-tolerant control and its application in quad-rotor UAV system are studied. Firstly, the global sliding mode surface is combined with Barrier function based adaptive sliding mode control, which omits the approach process of phase I of traditional Barrier adaptive sliding mode motion, thus improving the rapidity and accuracy of the algorithm. Secondly, the Barrier function adaptive law is used to adjust the gain of the switching term, so that the controller gain can change with the amplitude of the total disturbance in a timely and accurate manner, avoiding the overestimation problem and thus reducing the chattering of the control signal. Finally, the experimental results on the fault-tolerant control platform for multi-rotor UAVs prove the effectiveness and superiority of the proposed algorithm.