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| 1 | Flow Characteristics Diagnosis and Optimization for Dust Collectors Inflow Duct in Thermal Power Plants显示文摘火电厂烟风道用于输送烟气、冷风等介质,其设计优化水平不但影响火电厂烟风系统阻力的大小,而且影响与烟风道直接相连的各个设备的运行状态。某600MW机组除尘器前烟道设计不合理,存在磨损严重、进入除尘器烟气分配不均等问题,文中采用标准缸￡模型,利用Fluent求解器对该部分烟道的流场进行数值计算,诊断分析其存在的主要问题,提出的3个改造方案均可使烟道阻力大幅度下降、烟道磨损减轻、进入除尘器烟气分配均匀。同时,研究了缓转半径及烟气流速对该段烟道阻力和烟气分配的影响情况,计算结果表明该段烟道缓转半径宜选在0.875以上,烟气流速对该段烟道的性能基本没有影响。 | LIU Ming MENG Guixiang YAN Junjie CHEN Weixiong LI Weidong CHONG Daotong LIU Jiping | 2013 | 中国电机工程学报2013，33，11： | 22 |
| 2 | Effect of exposure to ambient PM2.5 pollution on the risk of respiratory tract diseases: a meta-analysis of cohort studies显示文摘The International Agency for Research on Cancer and the World Health Organization have designated airborne particulates,including particulates of median aerodynamic diameter < 2.5um(PM_(2.5)),as Group 1 carcinogens.It has not been determined,however,whether exposure to ambient PM_(2.5) is associated with an increase in respiratory related diseases.This meta-analysis assessed the association between exposure to ambient fine particulate matter(PM_(2.5)) and the risk of respiratory tract diseases,using relevant articles extracted from PubMed,Web of Science,and Embase.In results,of the 1,126 articles originally identified,35(3.1%) were included in this meta-analysis.PM_(2.5)was found to be associated with respiratory tract diseases.After subdivision by age group,respiratory tract disease,and continent,PM_(2.5) was strongly associated with respiratory tract diseases in children,in persons with cough,lower respiratory illness,and wheezing,and in individuals from North America,Europe,and Asia.The risk of respiratory tract diseases was greater for exposure to traffic-related than non-traffic-related air pollution.In children,the pooled relative risk(RR) represented significant increases in wheezing(8.2%),cough(7.5%),and lower respiratory illness(15.3%).The pooled RRs in children were 1.091(95%CI:1.049,1.135) for exposure to<25 μg/m^3 PM_(2.5),and 1.126(95%CI:1.067,1.190) for exposure to > 25 μg/m^3 PM_(2.5).In conclusion,exposure to ambient PM_(2.5) was significantly associated with the development of respiratory tract diseases,especially in children exposed to high concentrations of PM_(2.5). | Qian Liu Cheng Xu Guixiang Ji Hui Liu Wentao Shao Chunlan Zhang Aihua Gu Peng Zhao | 2017 | The Journal of Biomedical Research2017，31，2： | 16 |
| 3 | Diversity and high nitrogenase activity of endophytic diazotrophs isolated from Oryza rufipogon Griff.显示文摘Diversity and nitrogenase activity of endophytic diazotrophs colonized in the wild rice Oryza rufipogon Griff grown in Boluo, Huilai County in Guangdong Province and Lingshui County in Hainan Province were studied. Thirty-seven isolates obtained from Oryza rufipogon were identified as putative endophytic nitrogen-fixing bacteria by ARA (acetylene reduction assay) test and further confirmed by PCR amplification of nifH gene fragments. All obtained strains have ARA activity and the same sized nifH gene fragments. Above the similarity level of 80%, the obtained isolates were assigned as Group Ⅰ to Ⅷ by the clustering of IS-PCR fingerprints. The SDS-PAGE whole-cell protein patterns were similar to those of IS-PCR fingerprints. Components and contents of fatty acid methyl esters (FAMEs) were used to differentiate the representative strains (Ls13, Ls8, BL1, BL12, HL6, Ls4) from Group Ⅰ to Group Ⅵ. The six representative strains showed significant difference in contents and components of cellular fatty acid methyl ester. 16S rDNA sequencing analysis showed that strains of Group Ⅰ to Ⅶ were located in Enterobacteraceae (γ-proteobacteria). Strains of Group Ⅰ and Group II were closely related to Klebsiella sp.; Strain Ls8 of Group Ⅱ was a little far away from the genus of Pantoea (homology level 96% with Pantoea agglomerans), which may represent a new species or genus in Enterobacteraceae; Strains of Groups IV and V belonged to different Enterobacter sp.; Strain Ls4 and Ls 9 representing Group Ⅵ were close to Citrobacter amalonaticus with 98% sequence similarity; Strain Ls15 of Group Ⅶ showed 98% sequence identity with Pantoea sp.; Strains of Group Ⅷ were assigned to the genus Ideonella (β-proteobacteria). Based on the above results, endophytic diazotrophs isolated from O. rufipogon showed great diversity and some diazotrophs showed high nitrogenase activity with 42.52 μmol/mL·h C2H4. Inoculation to rice tests indicated that the isolated endophytic diazotrophs significantly promoted the rice growth. | TAN ZhiYuan PENG GuiXiang XU PeiZhi AI ShaoYing TANG ShuanHu ZHANG GuoXia ZENG FengYun | 2009 | Chinese Science Bulletin2009，54，16： | 14 |
| 4 | New Iron-based SiC Spherical Composite Magnetic Abrasive for Magnetic Abrasive Finishing显示文摘SiC magnetic abrasive is used to polish surfaces of precise, complex parts which are hard, brittle and highly corrosion-resistant in magnetic abrasive finishing(MAF). Various techniques are employed to produce this magnetic abrasive, but few can meet production demands because they are usually time-consuming, complex with high cost, and the magnetic abrasives made by these techniques have irregular shape and low bonding strength that result in low processing efficiency and shorter service life. Therefore, an attempt is made by combining gas atomization and rapid solidification to fabricate a new iron-based SiC spherical composite magnetic abrasive. The experimental system to prepare this new magnetic abrasive is constructed according to the characteristics of gas atomization and rapid solidification process and the performance requirements of magnetic abrasive. The new iron-based SiC spherical composite magnetic abrasive is prepared successfully when the machining parameters and the composition proportion of the raw materials are controlled properly. Its morphology, microstructure, phase composition are characterized by scanning electron microscope(SEM) and X-ray diffraction(XRD) analysis. The MAF tests on plate of mold steel S136 are carried out without grinding lubricant to assess the finishing performance and service life of this new SiC magnetic abrasive. The surface roughness(Ra) of the plate worked is rapidly reduced to 0.051 μm from an initial value of 0.372 μm within 5 min. The MAF test is carried on to find that the service life of this new SiC magnetic abrasive reaches to 155 min. The results indicate that this process presented is feasible to prepare the new SiC magnetic abrasive; and compared with previous magnetic abrasives, the new SiC spherical composite magnetic abrasive has excellent finishing performance, high processing efficiency and longer service life. The presented method to fabricate magnetic abrasive through gas atomization and rapid solidification presented can significantly improve the finishing performance and service life of magnetic abrasive, and provide a more practical approach for large-scale industrial production of magnetic abrasive. | ZHANG Guixiang ZHAO Yugang ZHAO Dongbiao ZUO Dunwen YIN Fengshi | 2013 | Chinese Journal of Mechanical Engineering2013，26，2： | 12 |
| 5 | Preparation of photoanode and its application to flexible dye-sensitized solar cells显示文摘A TiO2 slurry was prepared by hydrothermal treating mixture of commercial TiO2 (P25),ethanol and distilled water in an autoclave.A flexible photoanode and dye-sensitized solar cell (DSSC) was fabricated on an ITO-coated poly (ethylene naphthalate) sheet (ITO/PEN) substrate by a doctor-blade technique.The sample was characterized with SEM,UV-vis,FTIR,and the photoelectric properties of the DSSC were measured.The influence of preparation conditions on the properties of the flexible DSSC was investigated.It is found that the TiO2 slurry hydrothermally treated in 185°C for 12 h has good stability and uniformity.Based on the slurry,a flexible DSSC with light-to-electric conversion efficiencies of 3.4% is achieved under irradiation with a simulate solar light intensity of 100 mW/cm2. | XIAO YaoMing,WU JiHuai,LI QingHua,XIE GuiXiang,YUE GenTian,YE HaiFeng,LAN Zhang,HUANG MiaoLiang & LIN JianMing Englineering Research Center of Environment-Friendly Functional Materials,Minsitry of Education,China The Key Laboratory for Functional Materials of Fujian Higher Education,Institute of Materials Physical Chemistry,Huaqiao University,Quanzhou 362021,China | 2010 | Chinese Science Bulletin2010，55，10： | 10 |
| 6 | Projected Shifts in Kppen Climate Zones over China and Their Temporal Evolution in CMIP5 Multi-Model Simulations显示文摘Previous studies have examined the projected climate types in China by 2100. This study identified the emergence time of climate shifts at a 1?scale over China from 1990 to 2100 and investigated the temporal evolution of K o¨ppen–Geiger climate classifications computed from CMIP5 multi-model outputs. Climate shifts were detected in transition regions(7%–8% of China's land area) by 2010, including rapid replacement of mixed forest(Dwb) by deciduous forest(Dwa) over Northeast China, strong shrinkage of alpine climate type(ET) on the Tibetan Plateau, weak northward expansion of subtropical winterdry climate(Cwa) over Southeast China, and contraction of oceanic climate(Cwb) in Southwest China. Under all future RCP(Representative Concentration Pathway) scenarios, the reduction of Dwb in Northeast China and ET on the Tibetan Plateau was projected to accelerate substantially during 2010–30, and half of the total area occupied by ET in 1990 was projected to be redistributed by 2040. Under the most severe scenario(RCP8.5), sub-polar continental winter dry climate over Northeast China would disappear by 2040–50, ET on the Tibetan Plateau would disappear by 2070, and the climate types in 35.9%and 50.8% of China's land area would change by 2050 and 2100, respectively. The results presented in this paper indicate imperative impacts of anthropogenic climate change on China's ecoregions in future decades. | Duo CHAN Qigang WU Guixiang JIANG Xianglin DAI | 2016 | Advances in Atmospheric Sciences2016，33，3： | 10 |
| 7 | Experimental study on the performance of bowl-tray rice precision seeder显示文摘In order to optimize the parameters of bowl-tray rice precision seeder and improve its performance,three major factors respectively at five levels,including shaped hole diameter,vertical displacement of rice seeds and rotating speed of cam,were tested,the quadratic orthogonal rotational regression experiments were conducted,and the effects on seeding rate,leakage sowing rate and the injury rate were investigated.The test results show that factors affecting rice seeding rate are in the order of shaped hole diameter,rotating speed of cam and vertical displacement of rice seeds.The factors affecting rice planting leakage rate are in the order of shaped hole diameter,vertical displacement of rice seeds and rotating speed of cam,and the factors affecting rice injury rate are in the order of rotating speed of cam,vertical displacement of rice seeds and shaped hole diameter.Optimal parameters(shaped hole diameter:10 mm,vertical displacement of rice seeds:27 mm,rotating speed of cam:13 r/min)and performance index(seeding rate:95.43%,leakage sowing rate:0.37%,injury rate:0.58%)provided the basis for design and performance improvement of the bowl-tray rice precision seeder. | Yi Shujuan Liu Yongfen Wang Chun Tao Guixiang Liu Haiyan Wang Ruihan | 2014 | International Journal of Agricultural and Biological Engineering2014，7，1： | 10 |
| 8 | Contrasting elevational diversity patterns for soil bacteria between two ecosystems divided by the treeline显示文摘Above- and below-ground organisms are closely linked, but how elevational distribution pattern of soil microbes shifting across the treeline still remains unknown. Sampling of 140 plots with transect, we herein investigated soil bacterial distribution pattern from a temperate forest up to a subalpine meadow along an elevational gradient using Illumina sequencing. Our results revealed distinct elevational patterns of bacterial diversity above and below the treeline in responding to changes in soil conditions:a hollow elevational pattern in the forest(correlated with soil temperature, pH, and C:N ratio) and a significantly decreasing pattern in the meadow(correlated with soil pH, and available phosphorus). The bacterial community structure was also distinct between the forest and meadow, relating to soil pH in the forest and soil temperature in the meadow. Soil bacteria did not follow the distribution pattern of herb diversity, but bacterial community structure could be predicted by herb community composition. These results suggest that plant communities have an important influence on soil characteristics, and thus change the elevational distribution of soil bacteria. Our findings are useful for future assessments of climate change impacts on microbial community. | Guixiang Li Guorui Xu Congcong Shen Yong Tang Yuxin Zhang Keming Ma | 2016 | Science China(Life Sciences)2016，59，11： | 9 |
| 9 | Analysis of genetic diversity and population structure of Chinese yak breeds (Bos grunniens) using microsatellite markers显示文摘Nine Chinese yak breeds (Maiwa, Tianzhu White, Qinghai Plateau, Sibu, Zhongdian, Pali, Tibetan High Mountain, Jiulong, and Xin-jiang) and Gayal were analyzed by means of 16 microsatellite markers to determine the level of genetic variation within populations, genetic relationship between populations, and population structure for each breed. A total of 206 microsatellite alleles were observed. Mean F-statistics (0.056) for 9 yak breeds indicated that 94.4% of the genetic variation was observed within yak breeds and 5.6% of the genetic variation existed amongst breeds. The Neighbor-Joining phylogenetic tree was constructed based on Nei's standard genetic dis-tances and two clusters were obtained. The Gayal separated from the yaks far away and formed one cluster and 9 yak breeds were grouped together. The analysis of population structure for 9 yak breeds and the Gayal showed that they resulted in four clusters; one clus-ter includes yaks from Tibet Autonomous Region and Qinghai Province, one cluster combines Zhongdian, Maiwa, and Tianzhu White, and Jiulong and Xinjiang come into the third cluster. Pali was mainly in the first cluster (90%), Jiulong was mainly in the second cluster (87.1%), Zhongdian was primarily in the third cluster (83%), and the other yak breeds were distributed in two to three clusters. The Gayal was positively left in the fourth cluster (99.3%). | Guixiang Zhang Weisheng Chen Ming Xue Zhigang Wang Hong Chang Xu Han Xinjun Liao Donglei Wang | 2008 | Journal of Genetics and Genomics2008，35，4： | 8 |
| 10 | Large eddy simulation of aircraft wake vortex with self-adaptive grid method显示文摘A self-adaptive-grid method is applied to numerical simulation of the evolution of aircraft wake vortex with the large eddy simulation(LES). The Idaho Falls(IDF)measurement of run 9 case is simulated numerically and compared with that of the field experimental data. The comparison shows that the method is reliable in the complex atmospheric environment with crosswind and ground effect. In addition, six cases with different ambient atmospheric turbulences and Brunt V¨ais¨al¨a(BV) frequencies are computed with the LES. The main characteristics of vortex are appropriately simulated by the current method. The onset time of rapid decay and the descending of vortices are in agreement with the previous measurements and the numerical prediction. Also, secondary structures such as baroclinic vorticity and helical structures are also simulated.Only approximately 6 million grid points are needed in computation with the present method, while the number can be as large as 34 million when using a uniform mesh with the same core resolution. The self-adaptive-grid method is proved to be practical in the numerical research of aircraft wake vortex. | Mengda LIN Guixiang CUI Zhaoshun ZHANG | 2016 | Applied Mathematics and Mechanics(English Edition)2016，37，10： | 8 |
| 11 | Fluxes of methane,carbon dioxide and nitrous oxide in an alpine wetland and an alpine grassland of the Tianshan Mountains,China显示文摘Methane(CH4), carbon dioxide(CO2) and nitrous oxide(N2O) are known to be major greenhouse gases that contribute to global warming. To identify the flux dynamics of these greenhouse gases is, therefore, of great significance. In this paper, we conducted a comparative study on an alpine grassland and alpine wetland at the Bayinbuluk Grassland Eco-system Research Station, Chinese Academy of Sciences. By using opaque, static, manual stainless steel chambers and gas chromatography, we measured the fluxes of CH4, N2O and CO2 from the grassland and wetland through an in situ monitoring study from May 2010 to October 2012. The mean flux rates of CH4, N2O and CO2 for the experimental alpine wetland in the growing season(from May to October) were estimated at 322.4 μg/(m2?h), 16.7 μg/(m2?h) and 76.7 mg/(m2?h), respectively; and the values for the alpine grassland were –88.2 μg/(m2?h), 12.7 μg/(m2?h), 57.3 mg/(m2?h), respectively. The gas fluxes showed large seasonal and annual variations, suggesting weak fluxes in the non-growing season. The relationships between these gas fluxes and environmental factors were analyzed for the two alpine ecosystems. The results showed that air temperature, precipitation, soil temperature and soil moisture can greatly influence the fluxes of CH4, N2O and CO2, but the alpine grassland and alpine wetland showed different feedback mechanisms under the same climate and environmental conditions. | GuiXiang HE KaiHui LI XueJun LIU YanMing GONG YuKun HU | 2014 | Journal of Arid Land2014，6，6： | 7 |
| 12 | Experimental study on seed-filling performance of maize bowl-tray precision seeder显示文摘According to the requirement of assorted maize transplanting machine,a maize bud-seed precise sowing device was presented for use in cold areas.Experiments were performed to optimise the parameters of a maize bowl-tray precise seeder to improve the seed-filling performance.When the diameter of brush seed wheel was 78 mm,the clearance of brushing seed was 3 mm,with the maize varieties Demeiya 1,the moisture content about 40%,the depth of shaped hole 6 mm,the two major factors,the diameter of shaped hole and the velocity of seed box,were tested at five levels for each factor using the orthogonal rotational regression experiment.The effects on the single-seed rate,multi-seed rate,empty-seed rate,broken-bud rate and damage rate were investigated.The test results indicated that the factors affecting the single-seed rate and the multi-seed rate were the diameters of shaped hole and the velocity of seeds box,and the factor affecting the empty-seed rate was primarily the diameter of shaped hole.This study determined the optimal parameters,and verified the results,which provide the basis for the design and performance improvement of the maize bud-seed bowl-tray precision seeder. | Mao Xin Yi Shujuan Tao Guixiang Yang Li Liu Haiyan Ma Yongcai | 2015 | International Journal of Agricultural and Biological Engineering2015，8，2： | 7 |
| 13 | Emodin attenuates severe acute pancreatitis-associated acute lung injury by suppressing pancreatic exosome-mediated alveolar macrophage activation显示文摘Severe acute pancreatitis-associated acute lung injury(SAP-ALI) is a serious disease associated with high mortality. Emodin has been applied to alleviate SAP-ALI;however, the mechanism remains unclear. We report that the therapeutic role of emodin in attenuating SAP-ALI is partly dependent on an exosomal mechanism. SAP rats had increased levels of plasma exosomes with altered protein contents compared to the sham rats. These infused plasma exosomes tended to accumulate in the lungs and promoted the hyper-activation of alveolar macrophages and inflammatory damage. Conversely,emodin treatment decreased the plasma/pancreatic exosome levels in the SAP rats. Emodin-primed exosomes showed less pro-inflammatory effects in alveolar macrophages and lung tissues than SAP exosomes. In detail, emodin-primed exosomes suppressed the NF-κB pathway to reduce the activation of alveolar macrophage and ameliorate lung inflammation by regulating PPARγ pathway, while these effects were amplified/abolished by PPARγ agonist/antagonist. Blockage of pancreatic acinar cell exosome biogenesis also exhibited suppression of alveolar macrophage activation and reduction of lung inflammation. This study suggests a vital role of exosomes in participating inflammation-associated organ-injury,and indicates emodin can attenuate SAP-ALI by reducing the pancreatic exosome-mediated alveolar macrophage activation. | Qian Hu Jiaqi Yao Xiajia Wu Juan Li Guixiang Li Wenfu Tang Jingping Liu Meihua Wan | 2022 | Acta Pharmaceutica Sinica B2022，12，10： | 7 |
| 14 | 7.0T nuclear magnetic resonance evaluation of the amyloid beta(1–40) animal model of Alzheimer's disease: comparison of cytology verification显示文摘3.0T magnetic resonance spectroscopic imaging is a commonly used method in the research of brain function in Alzheimer's disease.However,the role of 7.0T high-field magnetic resonance spectroscopic imaging in brain function of Alzheimer's disease remains unclear.In this study,7.0T magnetic resonance spectroscopy showed that in the hippocampus of Alzheimer's disease rats,the N-acetylaspartate wave crest was reduced,and the creatine and choline wave crest was elevated.This finding was further supported by hematoxylin-eosin staining,which showed a loss of hippocampal neurons and more glial cells.Moreover,electron microscopy showed neuronal shrinkage and mitochondrial rupture,and scanning electron microscopy revealed small size hippocampal synaptic vesicles,incomplete synaptic structure,and reduced number.Overall,the results revealed that 7.0T high-field nuclear magnetic resonance spectroscopy detected the lesions and functional changes in hippocampal neurons of Alzheimer's disease rats in vivo,allowing the possibility for assessing the success rate and grading of the amyloid beta(1–40) animal model of Alzheimer's disease. | Lei Zhang Shuai Dong Guixiang Zhao Yu Ma | 2014 | Neural Regeneration Research2014，9，4： | 6 |
| 15 | Genomics Approaches to Domestication Studies of Horticultural Crops显示文摘The majority of crops we eat today are derived from the domestication of their wild progenitors. Crop domestication satisfies the human need for food and nutrition. Characterization of the history and genetic basis of crop domestication is essential for us to conduct modern breeding practices. Genomics provide unprecedented opportunities for us to study domestication. In this review, the typical domestication syndromes of horticultural crops will be introduced. Using the tomato as a typical example, we will discuss how genetic and genomic data were used to decipher the origins, progenitors, and domestication processes of this crop. In the domestication exploration of the genetic basis especially,genome-scaled diversity scanning approaches have gained great popularity. Combining these approaches with QTL(Quantitative trait locus)-mapping, GWAS(Genome wide association study), metabolomics and homology-based searches as well as pan-genomics have demonstrated tremendous advantages and significantly contribute to our understanding of domestication. Genomics studies will accelerate domestication research and further breeding of crops. | Zhongmin Yang Guixiang Li Denise Tieman Guangtao Zhu | 2019 | Horticultural Plant Journal2019，5，6： | 6 |
| 16 | Application of upconversion luminescence in dye-sensitized solar cells显示文摘An upconversion luminescence powder TiO2:(Er3+,Yb3+) is prepared by a hydrothermal method and used to fabricate dye-sensitized solar cell (DSSC).The TiO2:(Er3+,Yb3+) powder undergoes upconversion luminescence,converting infrared light which the dye can not absorb into visible light with wavelengths of 510-700 nm which the dye can absorb,increasing the photocurrent of the DSSC.TiO2:(Er3+,Yb3+) also acts as a p-type dopant,heightening the Fermi level of the oxide film,which increases the photovoltage of the DSSC.The best performance of the DSSC is found when the ratio of TiO2/luminescence powder is 1/3 in the luminescence layer.Under simulated solar irradiation of 100 mW cm-2 (AM 1.5),the DSSC containing TiO2:(Er3+,Yb3+) doping achieves a light-to-electricity energy conversion efficiency of 7.28% compared with 6.41% for the undoped DSSC. | XIE GuiXiang LIN JianMing WU JiHuai LAN Zhang LI QingHua XIAO YaoMing YUE GenTian YUE HaiFeng HUANG MiaoLiang | 2011 | Chinese Science Bulletin2011，56，1： | 6 |
| 17 | Transient response of Reynolds stress transport to opposition control in turbulent channel flow显示文摘The mechanism for turbulence suppression by opposition control developed by Choi is studied via the analysis of Reynolds stress transport in the initial period of control.It is found that the pressure-strain and pressure-diffusion terms first break up the balance in vertical normal Reynolds stress transport,and result in the final global suppression of turbulence intensities.The transient growth in spanwise normal Reynolds stress is also caused by the pressure-strain term. | GE MingWei XU ChunXiao CUI GuiXiang | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，2： | 6 |
| 18 | Characteristic Verification and Parameter Optimization of Airbags Cushion System for Airborne Vehicle显示文摘The major methods to investigate the airbags cushion system are experimental method,thermodynamic method and finite element method(FEM).Airbags cushion systems are very complicated and very difficult to be investigated thoroughly by such methods.For experimental method,it is nearly impossible to completely analyze and optimize the cushion characteristics of airbags of airborne vehicle because of charge issue,safety concern and time constraint.Thermodynamic method fails to take the non-linear effects of large airbag deformation and varied contact conditions into consideration.For finite element method,the FE model is usually complicated and the calculation takes tens of hours of CPU time.As a result,the optimization of the design based on a nonlinear model is very difficult by traditional iterative approach method.In this paper,a model based on FEM and control volume method is proposed to simulate landing cushion process of airborne vehicle with airbags cushion system in order to analyze and optimize the parameters in airbags cushion system.At first,the performance of airbags cushion system model is verified experimentally.In airdrop test,accelerometers are fixed in 4 test points distributed over engine mount,top,bottom and side armor plate of hull to obtain acceleration curves with time.The simulation results are obtained under the same conditions of the airdrop test and the simulation results agree very well with the experimental results,which indicate the established model is valid for further optimization.To optimize the parameters of airbags,equivalent response model based on Latin Hypercube DOE and radial basis function is employed instead of the complex finite element model.Then the optimal results based on equivalent response model are obtained using simulated annealing algorithm.After optimization,the maximal acceleration of airborne vehicle landing reduces 19.83%,while the energy absorption by airbags increases7.85%.The performance of the airbags cushion system thus is largely improved through optimization,which indicates the proposed method has the capability of solving the parameter optimization problem of airbags cushion system for airborne vehicle. | WANG Hongyan HONG Huangjie HAO Guixiang DENG Huaxia RUI Qiang LI Jianyang | 2014 | Chinese Journal of Mechanical Engineering2014，27，1： | 5 |
| 19 | Coherent structures in wall turbulence and mechanism for drag reduction control显示文摘Herein is introduced the mechanism for active control influencing the generation of the near-wall streamwise vortices,which are closely related to the production of high skin friction in wall-bounded turbulent flows.A new opposition control scheme with adjusting control amplitude is proposed and evaluated in turbulent channel flow by direct numerical simulations.The maximum drag reduction rate can be greatly enhanced by the strengthened control.Finally the effectiveness of the control to the coherent structures at high Reynolds numbers is investigated by using a linear transient growth model. | XU ChunXiao DENG BingQing HUANG WeiXi CUI GuiXiang | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，6： | 5 |
| 20 | Study on the dynamic characteristics of flow over building cluster at high Reynolds number by large eddy simulation显示文摘In this paper,the dynamic characteristics of building clusters are simulated by large eddy simulation at high Reynolds number for both homogeneous and heterogeneous building clusters.To save the computational cost a channel-like flow model is applied to the urban canopy with free slip condition at the upper boundary.The results show that the domain height is an important parameter for correct evaluation of the dynamic characteristics.The domain height must be greater than 8h(h is the average building height)in order to obtain correct roughness height while displacement height and roughness sublayer are less sensitive to the domain height.The Reynolds number effects on the dynamic characteristics and flow patterns are investigated.The turbulence intensity is stronger inside building cluster at high Reynolds number while turbulence intensity is almost unchanged with Reynolds number above the building cluster.Roughness height increases monotonously with Reynolds number by 20%from Re*=103 to Re*=105 but displacement height is almost unchanged.Within the canopy layer of heterogeneous building clusters,flow structures vary between buildings and turbulence is more active at high Reynolds number. | WANG BoBin WANG ZhiShi CUI GuiXiang ZHANG ZhaoShun | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，6： | 5 |
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