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| 1 | 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 |
| 2 | An approx- imate solution of nonlinear oil film forces of turbulent fi- nite length journal bearing显示文摘 | Zhang Yongfang Hei Di Liu Cheng | 2014 | Tribology International2014，74，： | 1 |
| 3 | Stability and bi- furcation of a non-linear bearing-flexible rotor coupling dynamic system显示文摘 | Lu Yanjun Dai Rong Hei Di | 2009 | IMechE Journal of Mechanical En- gineering Science2009，223，4： | 1 |
| 4 | Stability and bifurcation of a non-linear bearing-flexible rotor coupling dynamic system显示文摘 | Lu Yanjun Dai Rong Hei Di | 2009 | Journal of Mechanical Engineering Science2009，223，4： | 1 |
| 5 | Fingerprint profiling of acid hydrolyzates of polysaccha- rides extracted from the fruiting bodies and spores of Lingzhi by high - performance thin layer chromatography 显示文摘 | Xin Di Kelvin K C Chanb Hei Wun Leung B | 2003 | Journal of Chromatography A2003，1018，1： | 1 |
| 6 | Nonlinear dynamic behaviors of a rod fastening rotor supported by fixed-tilting pad journal bearings显示文摘 | Hei Di Lu Y J Zhang Y F | 2014 | Chaos Solitons and Fractals2014，69，： | 1 |
| 7 | Light trapping enhanced broadband photodetection and imaging based on MoSe_(2)/pyramid Si vdW heterojunction显示文摘Two-dimensional(2D)layered materials have been considered promising candidates for next-generation optoelectronics.However,the performance of 2D photodetectors still has much room for improvement due to weak light absorption of planar 2D materials and lack of high-quality heterojunction preparation technology.Notably,2D materials integrating with mature bulk semiconductors are a promising pathway to overcome this limitation and promote the practical application on optoelectronics.In this work,we present the patterned assembly of MoSe_(2)/pyramid Si mixed-dimensional van der Waals(vdW)heterojunction arrays for broadband photodetection and imaging.Benefited from the light trapping effect induced enhanced optical absorption and high-quality vdW heterojunction,the photodetector demonstrates a wide spectral response range from 265 to 1550 nm,large responsivity up to 0.67 A·W^(-1),high specific detectivity of 1.84×10^(13)Jones,and ultrafast response time of 0.34/5.6μs at 0 V.Moreover,the photodetector array exhibits outstanding broadband image sensing capability.This study offers a novel development route for high-performance and broadband photodetector array by MoSe_(2)/pyramid Si mixed-dimensional heterojunction. | Shaoqin Pan Shuo-En Wu Jinjin Hei Zhiwen Zhou Longhui Zeng Yakun Xing Pei Lin Zhifeng Shi Yongtao Tian Xinjian Li Di Wu | 2023 | Nano Research2023，16，7： | 0 |
| 8 | 做Gphone达人 Android系统十大软件推荐显示文摘Android操作系统从出世到现在已被越来越多的人所熟悉,甚至是钟爱,但是相信还有些人对Android还是处于云里雾里的状态,那么Android到底是怎样的呢?Android一词的本义指“机器人”,同时也是Google于2007年11月5日宣布的基于Linux平台的开源手机操作系统的名称, | Hei di | 2010 | 移动信息2010，，3： | 0 |
| 9 | Catheter-based intervention for symptomatic patient with severe mitral regurgitation and very poor left ventricular systolic function-Safe but no room for complacency显示文摘Many patients with left ventricular systolic dysfunction have concomitant mitral regurgitation(MR). Their symptoms and prognosis worsen with increasing severity of MR. Percutaneous Mitra Clip® can be used safely to reduce the severity of MR even in patients with advanced heart failure and is associated with improved symptoms, quality of life and exercise tolerance. However, a few patients with very poor left ventricular systolic function may experience significant haemodynamic disturbance in the peri-procedural period. We present three such patients, highlighting some of the potential problems encountered and discuss their possible pathophysiological mechanisms and safety measures. | Poay Huan Loh Christos V Bourantas Pak Hei Chan Nikolaj Ihlemann Fin Gustafsson Andrew L Clark Susanna Price Carlo Di Mario Neil Moat Farqad Alamgir Rodrigo Estevez-Loureiro Lars SΦndergaard Olaf Franzen | 2015 | World Journal of Cardiology2015，7，11： | 0 |
| 10 | Van der Waals integration inch-scale 2D MoSe_(2) layers on Si for highly-sensitive broadband photodetection and imaging显示文摘As one of the most promising materials for two-dimensional transition metal chalcogenides(2D TMDs),molybdenum diselenide(MoSe_(2))has great potential in photodetectors due to its excellent properties like tunable bandgap,high carrier mobility,and excellent air stability.Although 2D MoSe_(2)-based photodetectors have been reported to exhibit admired performance,the large-area 2D MoSe_(2)layers are difficult to be achieved via conventional synthesis methods,which severely impedes its future applications.Here,we present the controllable growth of large-area 2D MoSe_(2)layers over 3.5-inch with excellent homogeneity by a simple post-selenization route.Further,a high-quality n-MoSe_(2)/p-Si van der Waals(vdW)heterojunction device is in-situ fabricated by directly growing 2D n-MoSe_(2)layers on the patterned p-Si substrate,which shows a self-driven broadband photoresponse ranging from ultraviolet to mid-wave infrared with an impressive responsivity of 720.5 mA·W^(−1),a high specific detectivity of 10^(13) Jones,and a fast response time to follow nanosecond pulsed optical signal.In addition,thanks to the inch-level 2D MoSe_(2)layers,a 4×4 integrated heterojunction device array is achieved,which has demonstrated good uniformity and satisfying imaging capability.The large-area 2D MoSe_(2)layer and its heterojunction device array have great promise for high-performance photodetection and imaging applications in integrated optoelectronic systems. | Yupiao Wu Shuo-En Wu Jinjin Hei Longhui Zeng Pei Lin Zhifeng Shi Qingming Chen Xinjian Li Xuechao Yu Di Wu | 2023 | Nano Research2023，16，8： | 0 |
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