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Abstract :
In this paper, using the improved Model Predictive Control (MPC) and the Control Allocation (CA) methods with the combination of observer to solve the case that when the large civil aircraft under different wind disturbances it will still be close to the target tracking commands. First calculate the static and dynamic of admissible command set. Then, with the actual demand set, steady state vector calculator and MPC controller will be executed. Finally, the control distributor will solve the MPC's virtual output to each actual actuators. Through the projection algorithm, the method of the original signals of two step filtration, the reachable command set will be shrink, so as to reduce the workload of the original online optimization calculation. The simulation results show that the methods used in this paper has good response characteristics through the design of closed-loop scheme, under the gust disturbances it can still achieve a good of command signal tracking, and has certain robustness. © 2017, Editorial Board of Journal of Northwestern Polytechnical University. All right reserved.
Keyword :
Achievable command set Control allocation Gust load alleviation Online optimization Original signal Projection algorithms Response characteristic Wind disturbance
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GB/T 7714 | Liu, Jinglong , Hu, Zhi , Zhang, Weiguo et al. A MPC and Control Allocation Method for Gust Load Alleviation [J]. | Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University , 2017 , 35 (2) : 259-266 . |
MLA | Liu, Jinglong et al. "A MPC and Control Allocation Method for Gust Load Alleviation" . | Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 35 . 2 (2017) : 259-266 . |
APA | Liu, Jinglong , Hu, Zhi , Zhang, Weiguo , Xu, Liwei , He, Qizhi . A MPC and Control Allocation Method for Gust Load Alleviation . | Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University , 2017 , 35 (2) , 259-266 . |
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In this study, the spatial and temporal changes of chlorophyll-a and suspended matter (denoted using the back-scattering coefficient of suspended matter at 555 nm, b(b)(555)) in China's eastern coastal zones (CECZ) over a 16 year period, using remote sensing technology, are explored. It was found that chlorophyll-a concentration and b(b)(555) gradually decrease from the northeastern to the southeastern CECZ due to global warming. The monthly average b(b)(555) slowly decreased in the CECZ from September, 1997 to September, 2013. The decreases of b(b)(555) led to decreases of nutrient supports and the diffuse attenuation coefficient, because the CECZ fell into the TSM-dominated coastal water category. However, the phytoplankton growth was not only limited by the nutrients provided, but also depended on the environmental temperatures, as well as some other. factors. As a result, the chlorophyll-a concentration gradually increased in the Bohai and Yellow Seas, but slowly decreased in the East China Sea. Since a large amount of the river around the CECZ discharged suspended matter into the global oceanic system, there was a strong co-variation of b(b)(555) between the CECZ and the global oceans. The use of b(b)(555) in the CECZ can account for 59% of the variations of b(b)(555) in the global oceanic system, which is much higher than that of the chlorophyll-a concentration, due to the variables impacting the spatial distribution of phytoplanlcton being much more complicated than those of the suspended matter. (C) 2015 Elsevier Ltd. All rights reserved.
Keyword :
Heat stratification Solar heating Turbidity water Upper oceanic layer Water quality
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GB/T 7714 | Chen, J , Liu, JL . The spatial and temporal changes of chlorophyll-a and suspended matter in the eastern coastal zones of China during 1997-2013 [J]. | CONTINENTAL SHELF RESEARCH , 2015 , 95 : 89-98 . |
MLA | Chen, J et al. "The spatial and temporal changes of chlorophyll-a and suspended matter in the eastern coastal zones of China during 1997-2013" . | CONTINENTAL SHELF RESEARCH 95 (2015) : 89-98 . |
APA | Chen, J , Liu, JL . The spatial and temporal changes of chlorophyll-a and suspended matter in the eastern coastal zones of China during 1997-2013 . | CONTINENTAL SHELF RESEARCH , 2015 , 95 , 89-98 . |
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Abstract :
观察作者自制的尿素免疫脂质体对体外培养的人血管瘤内皮细胞(HVEC)的作用和影响.通过尿素免疫脂质体对体外培养的HVEC形态学影响的观察、细胞毒测定、和对群体倍增时间的影响研究.结果表明:加入尿素免疫脂质体后,HVEC细胞状态差,细胞有皱缩且随浓度的增高抑制明显增强,大于400mg/ml,细胞即刻固定,死亡;随着尿素免疫脂质体终浓度的逐渐升高和作用时间的延长,HVEC细胞存活率逐渐降低,与对照组相比有显著性差异,呈明显的剂量和时间依赖性.HVEC细胞存活率与尿素免疫脂质体终浓度呈显著负相关,相关系数为-0.97315,(P<0.01);2.6%尿素组的细胞杀伤率为27.94%.2.6%尿素脂质体组的细胞杀伤率为84.01%.2.6%尿素免疫脂质体组的细胞杀伤率为99.91%.说明尿素免疫脂质体对体外培养的HVEC具有明显的抑制和杀伤作用.
Keyword :
尿素免疫脂质体 人血管瘤内皮细胞 体外培养 血管内皮生长因子受体抗体 作用和影响
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GB/T 7714 | 王志亮 , 刘京龙 , 段降龙 et al. 尿素免疫脂质体对人血管瘤内皮细胞影响的实验研究 [J]. | 生物医学工程研究 , 2010 , (4) : 223-228 . |
MLA | 王志亮 et al. "尿素免疫脂质体对人血管瘤内皮细胞影响的实验研究" . | 生物医学工程研究 4 (2010) : 223-228 . |
APA | 王志亮 , 刘京龙 , 段降龙 , 李宗芳 , 段明辉 , 徐心 et al. 尿素免疫脂质体对人血管瘤内皮细胞影响的实验研究 . | 生物医学工程研究 , 2010 , (4) , 223-228 . |
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Abstract :
Effects of graphite crucible on mass transport and crystal growth process has been investigated in the fabrication of SiC single crystal by the seeded sublimation growth method. Different graphitization degrees of the crucibles were obtained by heat treatment at various temperatures between 2100 and 2300 degrees C. The crucibles were subjected to SEM and XRD in which the graphitization degree was determined quantitatively. The experimental results indicate that the graphite crucible plays an important role in the SiC crystal growth by providing carbon. High crystal growth is obtained by using the untreated crucibles (corresponding to low graphitization degree), which contributes to the reaction activity between Si and graphite of the crucible. Increasing the graphitization degree results in degradation in crystal growth, even in the graphitization of the SiC seed crystal. (c) 2005 Elsevier B.V. All rights reserved.
Keyword :
graphitization degree growth from vapor mass transfer single crystal growth
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GB/T 7714 | Liu, JL , Gao, JQ , Cheng, JK et al. Effects of graphitization degree of crucible on SiC single crystal growth process [J]. | DIAMOND AND RELATED MATERIALS , 2006 , 15 (1) : 117-120 . |
MLA | Liu, JL et al. "Effects of graphitization degree of crucible on SiC single crystal growth process" . | DIAMOND AND RELATED MATERIALS 15 . 1 (2006) : 117-120 . |
APA | Liu, JL , Gao, JQ , Cheng, JK , Yang, HF , Qiao, GJ . Effects of graphitization degree of crucible on SiC single crystal growth process . | DIAMOND AND RELATED MATERIALS , 2006 , 15 (1) , 117-120 . |
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Abstract :
Effects of graphite crucible on the mass transport and the growth rate of the SiC single crystal in fabricating SiC single crystal has been investigated by the seeded sublimation growth method. Different graphitization degrees of the crucibles were obtained by heat treatment at various temperatures between 2100 degrees C and 2300 degrees C. The crucibles were subjected to SEM observation, XRD investigation, and the graphitization degree was determined quantitatively. The experimental results indicate that the graphite crucible is an important C source provider in the SiC crystal growth. High crystal growth rate is obtained by using the untreated crucibles (corresponding to low graphitization degree), which contributed to the reaction activity between Si and graphite of the crucible. Increasing the graphitization degree resulted in degradation in crystal growth, even graphitization of the SiC seed crystal.
Keyword :
graphitization degree mass transfer SiC single crystal growth
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GB/T 7714 | Liu, JL , Gao, JQ , Cheng, JK et al. Effect of graphitization degree of crucible on SiC single crystal growth process [J]. | RARE METAL MATERIALS AND ENGINEERING , 2005 , 34 (12) : 1944-1947 . |
MLA | Liu, JL et al. "Effect of graphitization degree of crucible on SiC single crystal growth process" . | RARE METAL MATERIALS AND ENGINEERING 34 . 12 (2005) : 1944-1947 . |
APA | Liu, JL , Gao, JQ , Cheng, JK , Yang, JF , Qiao, GJ . Effect of graphitization degree of crucible on SiC single crystal growth process . | RARE METAL MATERIALS AND ENGINEERING , 2005 , 34 (12) , 1944-1947 . |
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The micropipe formation in 6H-SiC single crystal fabricated by sublimation method has been investigated via a stacking fault with a core of inclusion model. Sizes, shapes and the density of micropipes were investigated and the inclusions in the micropipes and the stacking faults (SFs) were analyzed. SFs and inclusions are the two necessary conditions for the formation of the micropipes. The shapes of micropipes are determined by the SFs tracks, and their sizes and density are mainly done by the sizes and number of the inclusions. (c) 2005 Elsevier B.V. All rights reserved.
Keyword :
crystal growth defects inclusion micropipe stacking fault
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GB/T 7714 | Liu, JL , Gao, JQ , Cheng, JK et al. Model for micropipe formation in 6H-SiC single crystal by sublimation method [J]. | MATERIALS LETTERS , 2005 , 59 (18) : 2374-2377 . |
MLA | Liu, JL et al. "Model for micropipe formation in 6H-SiC single crystal by sublimation method" . | MATERIALS LETTERS 59 . 18 (2005) : 2374-2377 . |
APA | Liu, JL , Gao, JQ , Cheng, JK , Yang, JF , Qiao, GJ . Model for micropipe formation in 6H-SiC single crystal by sublimation method . | MATERIALS LETTERS , 2005 , 59 (18) , 2374-2377 . |
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Abstract :
Van der Woude syndrome (VWS, OMIM 119300) is an autosomal dominant craniofacial disorder characterized by pits of the lower lip, hypodontia, and cleft lip and/or cleft palate. It is the most common form of syndromic orofacial clefting and has very high penetrance with varied expressivity. The disease locus for VWS has been mapped to a 1.6-cM region on 1q32-41 between D1S205 and D1S491. Recently, mutations have been found in the interferon regulatory factor 6 (IRF6) gene in patients with VWS and popliteal pterygium syndrome. To identify novel mutations of IRF6 in VWS patients, we screened four Chinese VWS families in all nine exons and their flanking splice junctions by direct sequencing. We identified three missense mutations and one nonsense mutation in IRF6. Our study further confirmed that IRF6 is essential for craniofacial development.
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GB/T 7714 | Wang, XF , Liu, JL , Zhang, HB et al. Novel mutations in the IRF6 gene for Van der Woude syndrome [J]. | HUMAN GENETICS , 2003 , 113 (5) : 382-386 . |
MLA | Wang, XF et al. "Novel mutations in the IRF6 gene for Van der Woude syndrome" . | HUMAN GENETICS 113 . 5 (2003) : 382-386 . |
APA | Wang, XF , Liu, JL , Zhang, HB , Xiao, MZ , Li, JF , Yang, CL et al. Novel mutations in the IRF6 gene for Van der Woude syndrome . | HUMAN GENETICS , 2003 , 113 (5) , 382-386 . |
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GB/T 7714 | Hou, Yu , Xiong, Lianyou , Wang, Jin et al. Development of aerodynamic foil journal bearing [J]. | Run Hua Yu Mi Feng/Lubrication Engineering , 2000 , (2) : 2-4, 8 . |
MLA | Hou, Yu et al. "Development of aerodynamic foil journal bearing" . | Run Hua Yu Mi Feng/Lubrication Engineering 2 (2000) : 2-4, 8 . |
APA | Hou, Yu , Xiong, Lianyou , Wang, Jin , Liu, Jinglong , Chen, Chunzheng . Development of aerodynamic foil journal bearing . | Run Hua Yu Mi Feng/Lubrication Engineering , 2000 , (2) , 2-4, 8 . |
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GB/T 7714 | Xiong, Lianyou , Hou, Yu , Wang, Jin et al. Multi-function test stand for aerodynamic thrust bearings and computer-aided measuring system [J]. | Run Hua Yu Mi Feng/Lubrication Engineering , 2000 , (4) : 50-51 . |
MLA | Xiong, Lianyou et al. "Multi-function test stand for aerodynamic thrust bearings and computer-aided measuring system" . | Run Hua Yu Mi Feng/Lubrication Engineering 4 (2000) : 50-51 . |
APA | Xiong, Lianyou , Hou, Yu , Wang, Jin , Liu, Jinglong , Chen, Chunzheng . Multi-function test stand for aerodynamic thrust bearings and computer-aided measuring system . | Run Hua Yu Mi Feng/Lubrication Engineering , 2000 , (4) , 50-51 . |
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GB/T 7714 | Xiong, Lianyou , Hou, Yu , Wang, Jin et al. Experiment study on the instability of the externally pressurized gas bearing with axial slots of tangential supply [J]. | Run Hua Yu Mi Feng/Lubrication Engineering , 2000 , (1) : 31-32, 68 . |
MLA | Xiong, Lianyou et al. "Experiment study on the instability of the externally pressurized gas bearing with axial slots of tangential supply" . | Run Hua Yu Mi Feng/Lubrication Engineering 1 (2000) : 31-32, 68 . |
APA | Xiong, Lianyou , Hou, Yu , Wang, Jin , Liu, Jinglong , Li, Yi , Chen, Chunzheng . Experiment study on the instability of the externally pressurized gas bearing with axial slots of tangential supply . | Run Hua Yu Mi Feng/Lubrication Engineering , 2000 , (1) , 31-32, 68 . |
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