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| 1 | MHD Flow Control of Oblique Shock Waves Around Ramps in Low-temperature Supersonic Flows显示文摘This article is devoted to experimental study on the control of the oblique shock wave around the ramp in a low-temperature supersonic flow by means of the magnetohydrodynamic(MHD) flow control technique.The purpose of the experiments is to take advantage of MHD interaction to weaken the oblique shock wave strength by changing the boundary flow characteristics around the ramp.Plasma columns are generated by pulsed direct current(DC) discharge,the magnetic fields are generated by Nd-Fe-B rare-earth permanent magnets and the oblique shock waves in supersonic flow are generated by the ramp.The Lorentz body force effect of MHD interaction on the plasma-induced airflow velocity is verified through particle image velocimetry(PIV) measurements.The experimental results from the supersonic wind tunnel indicate that the MHD flow control can drastically change the flow characteristics of the airflow around the ramp and decrease the ratio of the Pitot pressure after shock wave to that before it by up to 19.66%,which leads to the decline in oblique shock wave strength.The oblique shock waves in front of the ramp move upstream by the action of the Lorentz body force.The discharge characteristics are analyzed and the MHD interaction time and consumed energy are determined with the help of the pulsed DC discharge images.The interaction parameter corresponding to the boundary layer velocity can reach 1.3 from the momentum conservation equation.The velocity of the plasma column in the magnetic field is much faster than that in the absence of magnetic field force.The plasma can strike the neutral gas molecules to transfer momentum and accelerate the flow around the ramp. | Su Changbing,Li Yinghong,Cheng Bangqin,Wang Jian,Cao Jun,Li Yiwen Engineering College,Air Force Engineering University,Xi’an 710038,China | 2010 | Chinese Journal of Aeronautics2010，23，1： | 15 |
| 2 | Identification of a novel mutation in POU3F4 for prenatal diagnosis in a Chinese family with X-linked nonsyndromic hearing loss显示文摘We present the clinical and genetic findings for a Chinese family with X-linked non-syndromic hearing loss in which the affected males showed congenital profound sensorineural hearing impairment. In two affected brothers, the computer tomography of temporal bone showed bilateral dilation of the internal auditory canal with fistulous communication between the lateral canal and the basal cochlear turn, which is consistent with the typical DFNX2 phenotype. A missense mutation (c.647G→A) in the POU3F4 gene caused a substitu- tion from glycine to glutamic acid at position 216 (p.G216E), and this mutation was found to consistently cosegregate with the deafness phenotype in the family. The mutation resulted in the loss of function of the POU3F4 by decreasing the affinity between the protein and DNA, as shown in silico by the structural analysis. Prenatal diagnosis of pregnant proband of this family revealed the c.647G→A muta- tion in DNA extracted from the amniotic fluid surrounding the fetus. The appropriate use of genetic testing and prenatal diagnosis plays a key role in reducing the recurrence of genetic defects in high-risk families. | Jianzhong Li Jing Cheng Yanping Lu Yu Lu Airing Chen YiSun Dongyang Kang Xin Zhang Pu Dai Dongyi Han Huijun Yuan | 2010 | Journal of Genetics and Genomics2010，37，12： | 9 |
| 3 | Generalized Weighted Mean Combining Forecasting and Its Application in the Forecasting of Air Materials Consumption | WAN Yu\|cheng No.3 Department, Air Force Logistics College, Xuzhou 221002, China | 1999 | Systems Science and Systems Engineering1999，9，4： | 2 |
| 4 | Theory of Dynamic Diagnosis Based on Integrated Maintenance Information显示文摘Based on the concept of an integrated maintenance information system and related information environment, this paper discusses the process of troubleshooting in modern maintenance in detail, and gives a model of dynamic diagnosis of faults, in which a reasoning program is designed through taking advantage of information fusion and time analysis. In the end, the authors present the logic process of dynamic diagnosis through a typical example, and proposes a dynamic diagnostic system based on information fusion. | WANG Xiao cheng, WU Song lin, LIU Cang yi Department of Equipment Management Engineering, Air Force University of Engineering, Shaanxi, Xi’an 710038, P.R.China | 2002 | International Journal of Plant Engineering and Management2002，7，1： | 2 |
| 5 | Hydrogen pro- duction by mixed bacteria through (lark and photo fer- mentation 显示文摘 | CHENG J SU H ZHOU JH ET Air | 2011 | International Journal of Hydrogen En- ergy2011，36，1： | 1 |
| 6 | Efficacy and safety of sorafenib in patients in the Asia-Pacific region with advanced hepatocellular carcinoma: a phase I randomised, double- blind, placebo-controlled trial 显示文摘 | Cheng Air Kang YK Chen Z | 2009 | Lancet Oncol2009，10，1： | 1 |
| 7 | RELIABILITY BOUNDS IN NWUE CLASS WITH KNOWN MEAN AND VARIANCE显示文摘Let. F∈NWUE with known mean and variance. In this note a simple sharplower bound of F=1-F(t) is given. | CHENG Kan HE Zongfu Institute of Applied of Mathematics,Academia Sinica,Beijing 100080,China Air Force Engineering College,Xi’an 710038, China | 1993 | Systems Science and Mathematical Sciences1993，6，2： | 0 |
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