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| 1 | Approximate Solution of Oil Film Load-carrying Capacity of Turbulent Journal Bearing with Couple Stress Flow显示文摘The instability of the rotor dynamic system supported by oil journal bearing is encountered frequently, such as the half-speed whirl of the rotor, which is caused by oil film lubricant with nonlinearity. Currently, more attention is paid to the physical characteristics of oil film due to an oil-lubricated journal bearing being the important supporting component of the bearing-rotor systems and its nonlinear nature. In order to analyze the lubrication characteristics of journal bearings efficiently and save computational efforts, an approximate solution of nonlinear oil film forces of a finite length turbulent journal bearing with couple stress flow is proposed based on Sommerfeld and Ocvirk numbers. Reynolds equation in lubrication of a finite length turbulent journal bearing is solved based on multi-parametric principle. Load-carrying capacity of nonlinear oil film is obtained, and the results obtained by different methods are compared. The validation of the proposed method is verified, meanwhile, the relationships of load-carrying capacity versus eccentricity ratio and width-to-diameter ratio under turbulent and couple stress working conditions are analyzed. The numerical results show that both couple stress flow and eccentricity ratio have obvious influence on oil film pressure distribution, and the proposed method approximates the load-carrying capacity of turbulent journal bearings efficiently with various width-to-diameter ratios. This research proposes an approximate solution of oil film load-carrying capacity of turbulent journal bearings with different width-to-diameter ratios, which are suitable for high eccentricity ratios and heavy loads. | ZHANG Yongfang WU Peng GUO Bo L Yanjun LIU Fuxi YU Yingtian | 2015 | Chinese Journal of Mechanical Engineering2015，28，1： | 10 |
| 2 | Bifurcation and Chaos Analysis of Nonlinear Rotor System with Axial-grooved Gas-lubricated Journal Bearing Support显示文摘Axial-grooved gas-lubricated journal bearings have been widely applied to precision instrument due to their high accuracy, low friction, low noise and high stability. The rotor system with axial-grooved gas-lubricated journal bearing support is a typical nonlinear dynamic system. The nonlinear analysis measures have to be adopted to analyze the behaviors of the axial-grooved gas-lubricated journal bearing-rotor nonlinear system as the linear analysis measures fail. The bifurcation and chaos of nonlinear rotor system with three axial-grooved gas-lubricated journal bearing support are investigated by nonlinear dynamics theory. A time-dependent mathematical model is established to describe the pressure distribution in the axial-grooved compressible gas-lubricated journal bearing. The time-dependent compressible gas-lubricated Reynolds equation is solved by the differential transformation method. The gyroscopic effect of the rotor supported by gas-lubricated journal bearing with three axial grooves is taken into consideration in the model of the system, and the dynamic equation of motion is calculated by the modified Wilson-θ-based method. To analyze the unbalanced responses of the rotor system supported by finite length gas-lubricated journal bearings, such as bifurcation and chaos, the bifurcation diagram, the orbit diagram, the Poincaré map, the time series and the frequency spectrum are employed. The numerical results reveal that the nonlinear gas film forces have a significant influence on the stability of rotor system and there are the rich nonlinear phenomena, such as the periodic, period-doubling, quasi-periodic, period-4 and chaotic motion, and so on. The proposed models and numerical results can provide a theoretical direction to the design of axial-grooved gas-lubricated journal bearing-rotor system. | ZHANG Yongfang HEI Di Lü Yanjun WANG Quandai MüLLER Norbert | 2014 | Chinese Journal of Mechanical Engineering2014，27，2： | 9 |
| 3 | Simulation and projection of climate change using CMIP6 Muti-models in the Belt and Road Region显示文摘Climate condition over a region is mostly determined by the changes in precipitation,temperature and evaporation as the key climate variables.The countries belong to the Belt and Road region are subjected to face strong changes in future climate.In this paper,we used five global climate models from the latest Sixth Phase of Coupled Model Intercomparison Project(CMIP6)to evaluate future climate changes under seven combined scenarios of the Shared Socioeconomic Pathways and the Representative Concentration Pathways(SSP1-1.9,SSP1-2.6,SSP2-4.5,SSP3-7.0,SSP4-3.4,SSP4-6.0 and SSP5-8.5)across the Belt and Road region.This study focuses on undertaking a climate change assessment in terms of future changes in precipitation,air temperature and actual evaporation for the three distinct periods as near-term period(2021−2040),mid-term period(2041−2060)and long-term period(2081−2100).To discern spatial structure,Köppen−Geiger Climate Classification method has been used in this study.In relative terms,the results indicate an evidence of increasing tendency in all the studied variables,where significant changes are anticipated mostly in the long-term period.In addition to,though it is projected to increase under all the SSP-RCP scenarios,greater increases will be happened under higher emission scenarios(SSP5-8.5 and SSP3-7.0).For temperature,robust increases in annual mean temperature is found to be 5.2°C under SSP3-7.0,and highest 7.0°C under SSP5-8.5 scenario relative to present day.The northern part especially Cold and Polar region will be even more warmer(+6.1°C)in the long-term(2081−2100)period under SSP5-8.5.Similarly,at the end of the twenty-first century,annual mean precipitation is inclined to increase largely with a rate of 2.1%and 2.8%per decade under SSP3-7.0 and SSP5-8.5 respectively.Spatial distribution demonstrates that the largest precipitation increases are to be pronounced in the Polar and Arid regions.Precipitation is projected to increase with response to increasing warming most of the regions.Finally,the actual evaporation is projected to increase significantly with rate of 20.3%under SSP3-7.0 and greatest 27.0%for SSP5-8.5 by the end of the century.It is important to note that the changes in evaporation respond to global mean temperature rise consistently in terms of similar spatial pattern for all the scenarios where stronger increase found in the Cold and Polar regions.The increase in precipitation is overruled by enhanced evaporation over the region.However,this study reveals that the CMIP6 models can simulate temperature better than precipitation over the Belt and Road region.Findings of this study could be the reliable basis for initiating policies against further climate induced impacts in the regional scale. | YanRan Lü Tong Jiang YanJun Wang BuDa Su JinLong Huang Hui Tao | 2020 | Research in Cold and Arid Regions2020，12，6： | 4 |
| 4 | A high-resolution,absolute-dated Holocene and deglacial Asian monsoon record from Dongge Cave,China显示文摘 | Dykoski C A Edwards R L Cheng Hai Yuan Daoxian Cai Yanjun Zhang Meiliang Lin Yushi Qing Jiaming An Zhisheng Revenangh J | | 0，，1： | 1 |
| 5 | A local-world network model based on inter-node correlation degree显示文摘 | Qi X Yanjun L and Tiejun W | 2007 | Physica A2007，378，： | 1 |
| 6 | Timing, duration, and transitions of the last interglacial Asian monsoon 显示文摘 | Yuan Daoxian Cheng Hai Edwards R L Dykoski C A Kelly M J Zhang Meiliang Qing Jiaming Lin Yushi Wang Yongjin Wu Jiangyin Dorale J A An Zhisheng Cai Yanjun | 2004 | Science2004，304，5670： | 1 |
| 7 | The formation mechanism of non-dendritic primary a-Al phase in semi-solid AlSi7 Mg Alloy显示文摘 | MAO Weimin YANJUN L I ZHAO Aimin | 2001 | Science and Technology of Advanced Materials2001，，2： | 1 |
| 8 | Wireless sensor/actuatornetwork design for mobile control applications显示文摘 | Feng X Yu Chu T Yanjun L | 2007 | Sensors2007，7，3： | 1 |
| 9 | A fast feedbackmethod to design easy-molding freeform optical systemwith uniform illuminance and high light control efficiency显示文摘 | Hongtao L Shichao C Yanjun H | 2013 | Optics express2013，21，1： | 1 |
| 10 | Herp is dually regulated by both the endoplasmic reticulum stress-specific branch of the unfolded protein response and a branch that is shared with other cellular stress pathways显示文摘 | Ma Yanjun Hendershot L M | | 0，，14： | 1 |
| 11 | Characteristics of aerobic biogranules from membrane bioreactor system显示文摘 | XIUFEN L JIAN C YANJUN L | 2007 | Journal of Membrane Science2007，287，2： | 1 |
| 12 | Wireless Sensor/Actuator Net- work Design for Mobile Control Applications 显示文摘 | Feng X Yu Cbu T Yanjun L | 2007 | Sensors2007，7，3： | 1 |
| 13 | Cyclooxygenase Inhibitory and Antioxidant Compounds from the Mycelia of the Edible Mushroom Grifola frondosa 显示文摘 | Yanjun ZHANG Gary L Mills | 2002 | Journal of Agricultural and Food Chemistry2002，50，26： | 1 |
| 14 | Molecular genetic mapping of quantitative trait loci for milling quality in rice (Oryza sativa L) 显示文摘 | YanJun D Tsuzuki E DongZhi L | 2004 | Journal of Cereal Science2004，40，2： | 1 |
| 15 | Genetic diversity and phylogenetic analysis of glycoprotein 5 of PRRSV isolates in mainland China from 1996 to 2006:Coexistence of two NA-subgenotypes with great diversity显示文摘 | Tongqing A Yanjun Z Guangqing L | 2007 | Veterinary Microbiology2007，123，： | 1 |
| 16 | Carburization Behaviour of Mn-Cr-O Spinel in High Temperature Hydrocarbon Pyrolysis Environment显示文摘 | Li Hao Zheng Yanjun Benum L W | 2009 | Corros Sci2009，51，10： | 1 |
| 17 | Analysis and design for thermal environment inside mobile operating compartment显示文摘 | Xu Xinxi Liu Yanjun Wang Taiyong l | 2007 | Inter- national Journal of Man-Machine- Environment System Engineer- ing2007，1，1： | 1 |
| 18 | WITHDRAWN:Effect of blood glucose fluctuation on the function of rat pancreatic islets in vivo 显示文摘 | Yanjun W Yue X Shixing L | 2011 | Regul Pept2011，6，： | 1 |
| 19 | Timing,duration,and transitions of the last interglacial Asian monsoon显示文摘 | Yuan Daoxian Cheng Hai Edwards R L Dykoski C A Kelly M J Zhang Meiliang Qing Jiaming Lin Yushi Wang Yongjin Wu Jiangying Dorale J A An Zhisheng Cai Yanjun | | 0，，： | 1 |
| 20 | Removal of Heteroaromatic Sulfur Compounds by a Non-noble Metal Fe Single-atom Adsorbent显示文摘Sulfur-containing compounds(SCCs)must be removed from fuels before use.In this study,a novel non-noble metal Fe single-atom adsorbent(SA-Fe/CN)was synthesized using a core-shell strategy and applied for the adsorptive removal of benzothiophene(BT)and dibenzothiophene(DBT).The adsorption isotherms,thermodynamics,kinetics,and adsorption-regeneration cycles of DBT and BT on SA-Fe/CN were studied.SA-Fe/CN exhibited a significant capacity to adsorb DBT,and the isothermal equilibrium was well described by the Langmuir isotherm.The Gibbs free energy values were negative(ΔG^(0)<0),indicating that the adsorption of DBT and BT was favored and spontaneous.The adsorption process conformed to the pseudo-second-order kinetic model with high R^(2) values(0.9994,0.9987).The adsorption capacity of SA-Fe/CN for DBT and BT reached 163.21 mg/g and 90.35 mg/g,respectively,due to the highly active sites of the single atom and electrostatic interaction with the sulfide.Therefore,SA-Fe/CN may be a promising adsorbent for SCC removal. | LüYanjun Wen Jie Gong Qinmei Zhang Lianhong Li Airong Arshid Mahmood Ali Zhang Hui | 2022 | China Petroleum Processing & Petrochemical Technology2022，24，2： | 0 |
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