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| 1 | Effect of acupotomy on nitric oxide synthase and beta-endorphin in third lumbar vertebrae transverse process syndrome model rats显示文摘OBJECTIVE: To explore the long-term effects and pain relief mechanism of acupotomy by observing changes in nitric oxide synthase(NOS) and beta-endorphin(β-EP) in the hypothalamus, spinal cord,and peripheral blood of rats with third lumbar vertebrae(L3) transverse process syndrome.METHODS:Twenty-eight SD rats were randomly assigned to normal, model, electroacupuncture(EA),and acupotomy group. The last three groups were put through an operation to emulate L3transverse process syndrome. Fourteen days after the simulation operation, EA and acupotomy treatments were applied to the respective groups. Fifty-six days afterthe simulation operation, biochemistry tests and enzyme-linked immunosorbent assay were used to measure NOS and β-EP in the hypothalamus, spinal cord, and peripheral blood.RESULTS: Rats with the simulation operation showed significantly higher levels of NOS and β-EP in the hypothalamus, spinal cord, and peripheral blood than those in the normal group. The EA and acupotomy groups had significantly lower levels of NOS and β-EP than those in the model group.There was no statistical difference between the EA and acupotomy groups.CONCLUSION: EA and acupotomy treatments significantly lowered NOS and β-EP levels in the hypothalamus, spinal cord, and peripheral blood and alleviated L3transverse process syndrome. | Changqing Guo Naigang Liu Xiaohong Li Hongmei Sun Bo Hu Jing Lu Yan Guo Chuxi Liang Hong Xu Haixia Wu | 2014 | Journal of Traditional Chinese Medicine2014，34，2： | 15 |
| 2 | Fixed-time adaptive model reference sliding mode control for an air-to-ground missile显示文摘This paper addresses the fixed-time adaptive model reference sliding mode control for an air-to-ground missile associated with large speed ranges, mismatched disturbances and un-modeled dynamics. Firstly, a sliding mode surface is developed by the tracking error of the state equation and the model reference state equation with respect to the air-to-ground missile. More specifically,a novel fixed-time adaptive reaching law is presented. Subsequently, the mismatched disturbances and the un-modeled dynamics are treated as the model errors of the state equation. These model errors are estimated by means of a fixed-time disturbance observer, and they are also utilized to compensate the proposed controller. Therefore, the fixed-time controller is obtained by an adaptive reaching law and a fixed-time disturbance observer. Closed-loop stability of the proposed controller is established. Finally, simulation results including Monte Carlo simulations, nonlinear six-DegreeOf-Freedom(6-DOF) simulations and different ranges are presented to demonstrate the efficacy of the proposed control scheme. | Liang ZHANG Changzhu WEI Rong WU Naigang CUI | 2019 | Chinese Journal of Aeronautics2019，32，5： | 8 |
| 3 | An Elasto-plastic Damage Constitutive Theory Based on Pair Functional Potentials and Slip Mechanism显示文摘The deformation work rate can be expressed by the time rate of pair functional potentials which describe the energy of materials in terms of atomic bonds and atom embedding interactions.According to Cauchy-Born rule,the relations between the microscopic deformations of atomic bonds and electron gas and macroscopic deformation are established.Further,atomic bonds are grouped according to their directions,and atomic bonds in the same direction are simplified as a spring-bundle component.Atom embedding interactions in unit reference volume are simplified as a cubage component.Consequently,a material model composed of spring-bundle components and a cubage component is established.Since the essence of damage is the decrease and loss of atomic bonding forces,the damage effect can be reflected by the response functions of these two kinds of components.Formulating the mechanical responses of two kinds of components,the corresponding elasto-damage constitutive equations are derived.Considering that slip is the main plastic deformation mechanism of polycrystalline metals,the slip systems of crystal are extended to polycrystalline,and the slip components are proposed to describe the plastic deformation.Based on the decomposition of deformation gradient and combining the plastic response with the elasto-damage one,the elasto-plastic damage constitutive equations are derived.As a result,a material model formulated with spring-bundle components,a cubage component and slip components is established.Different from phenomenological constitutive theories,the mechanical property of materials depends on the property of components rather than that directly obtained on the representative volume element.The effect of finite deformation is taken into account in this model.Parameter calibration procedure and the basic characteristics of this model are discussed. | Liu Fang Fu Qiang Chen Cen Liang Naigang | 2010 | Chinese Journal of Aeronautics2010，23，6： | 4 |
| 4 | The elasto-damage theory of the components assembling model显示文摘The potential energy in materials is well approximated by pair functional which is composed of pair potentials and embedding energy. During calculating material potential energy, the orientational component and the volumetric component are derived respectively from pair potentials and embedding energy. The sum of energy of all these two kinds of components is the material potential. No matter how microstructures change, damage or fracture, at the most level, they are all the changing and breaking atomic bonds. As an abstract of atomic bonds, these components change their stiffness during damaging. Material constitutive equations have been formulated by means of assembling all components' response functions. This material model is called the component assembling model. Theoretical analysis and numerical computing indicate that the proposed model has the capacity of reproducing some results satisfactorily, with the advantages of great conceptual simplicity, physical explicitness, and intrinsic induced anisotropy, etc. | DENG ShouChun LIANG NaiGang LU HaiXing | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，1： | 2 |
| 5 | The Spatial Variation of LURR and Seismic Tendency in Western United States显示文摘Load-Unload Response Ratio (LURR) is a new promising approach to earthquake prediction. In the previous years, a series of successful medium-term predictions have been made for strong earthquakes on the Chinese mainland using this method. In order to investigate whether the LURR method applies to different tectonic regimes, i.e., whether it is universal, the San Andreas Fault and its vicinities are chosen as the study region in this paper. The spatial variation of LURR in the western United States (30°~50°N, 100°~130°W) is studied in detail and the earthquake tendency in this region is discussed based on historic earthquake cases. | Zhang Huihui Yin Xiangchu Liang Naigang | 2005 | Earthquake Research in China2005，19，3： | 2 |
| 6 | A Tracking Filter in Spherical Coordinates Enhanced by De-noising of Converted Doppler Measurements显示文摘Tracking problem in spherical coordinates with range rate (Doppler) measurements, which would have errors correlated to the range measurement errors, is investigated in this paper. The converted Doppler measurements, constructed by the product of the Doppler measurements and range measurements, are used to replace the original Doppler measurements. A de-noising method based on an unbiased Kalman filter (KF) is proposed to reduce the converted Doppler measurement errors before updating the target states for the constant velocity (CV) model. The states from the de-noising filter are then combined with the Cartesian states from the converted measurement Kalman filter (CMKF) to produce final state estimates. The nonlinearity of the de-noising filter states are handled by expanding them around the Cartesian states from the CMKF in a Taylor series up to the second order term. In the mean time, the correlation between the two filters caused by the common range measurements is handled by a minimum mean squared error (MMSE) estimation-based method. These result in a new tracking filter, CMDN-EKF2. Monte Carlo simulations demonstrate that the proposed tracking filter can provide efficient and robust performance with a modest computational cost. | ZHOU Gongjian YU Changjun CUI Naigang QUAN Taifan | 2012 | Chinese Journal of Aeronautics2012，25，5： | 2 |
| 7 | Federated filter with strengthened FDIR capability for multiple sensor navigation system 显示文摘 | Rongjun Mu Siyuan Rong Naigang Cui | 2006 | IEEE Systems and Control in Aerospace and Astronautics2006，，： | 1 |
| 8 | A small,linear,piezoelectric ultrasonic cryomotor显示文摘 | Dong Shuxiang Yan Li Wang Naigang | 2005 | Applied Physics Letters2005，86，05： | 1 |
| 9 | Acoustic emission experiments of rock failure under load simulating the hypocenter condition 显示文摘 | Zhang Huihui Yin Xiangchu Liang Naigang | 2006 | Pure and Applied Geophysics2006，163，1112： | 1 |
| 10 | Asynchronous filtering of discrete-time switched linear systems with average dwell time显示文摘 | Zhang Lixian Cui Naigang Liu Ming | 2011 | IEEE Transactions on Circuits and Systems2011，58，5： | 1 |
| 11 | Study on missile formation reconfiguration optimized trajectory gener- ation and control 显示文摘 | Naigang Cui Changzhu Wei Jifeng Guoea | 2010 | Journal of Applied Mechanics2010，77，5： | 1 |
| 12 | A small, linear, piezoeleclric ultrasonic cryomotor 显示文摘 | Dong Shuxiang Li Yan Wang Naigang | 2005 | Appl Phys Lett2005，86，05： | 1 |
| 13 | An elasto-plastic damage constitutive theory and its prediction of evolution of subsequent yield surfaces and elastic constants显示文摘 | Fang Liu Qiang Fu Cen Chen Naigang Liang | 2011 | International Journal of Plasticity2011，，9： | 1 |
| 14 | Parameters and Trajectory Overall Optimization Design of the Combined Cycle Engine Reusable Launch Vehicle显示文摘Reusable launch vehicle is an important way to realize fast,cheap and reliable space transportation.A combined cycle engine system provides a more efficient and flexible form of power.The investigation on the research status of the combined cycle engine technology,including basic principle,research programs and classification of structure is firstly discussed in this paper.Then the bilevel hierarchical and integrated parameters/trajectory overall optimization technologies are applied to improve the efficiency and effectiveness of overall vehicle design.Simulations are implemented to compare and analyze the effectiveness and adaptability of the two algorithms,in order to provide the technical reserves and beneficial references for further research on combined cycle engine reusable launch vehicles. | CUI Naigang ZHAO Lina HUANG Rong WEI Changzhu | 2016 | Aerospace China2016，17，4： | 1 |
| 15 | Trajectory optimization for hyper-sonic boost-glide missile considering aero-heating显示文摘 | Li Yu Cui Naigang | 2009 | Aircraft Engineering and Aerospace Technology2009，，1： | 1 |
| 16 | On band gaps of nonlocal acoustic lattice metamaterials:a robust strain gradient model显示文摘We have proposed an'exact'strain gradient(SG)continuum model to properly predict the dispersive characteristics of diatomic lattice metamaterials with local and nonlocal interactions.The key enhancement is proposing a wavelength-dependent Taylor expansion to obtain a satisfactory accuracy when the wavelength gets close to the lattice spacing.Such a wavelength-dependent Taylor expansion is applied to the displacement field of the diatomic lattice,resulting in a novel SG model.For various kinds of diatomic lattices,the dispersion diagrams given by the proposed SG model always agree well with those given by the discrete model throughout the first Brillouin zone,manifesting the robustness of the present model.Based on this SG model,we have conducted the following discussions.(Ⅰ)Both mass and stiffness ratios affect the band gap structures of diatomic lattice metamaterials,which is very helpful for the design of metamaterials.(Ⅱ)The increase in the SG order can enhance the model performance if the modified Taylor expansion is adopted.Without doing so,the higher-order continuum model can suffer from a stronger instability issue and does not necessarily have a better accuracy.The proposed SG continuum model with the eighth-order truncation is found to be enough to capture the dispersion behaviors all over the first Brillouin zone.(Ⅲ)The effects of the nonlocal interactions are analyzed.The nonlocal interactions reduce the workable range of the well-known long-wave approximation,causing more local extrema in the dispersive diagrams.The present model can serve as a satisfactory continuum theory when the wavelength gets close to the lattice spacing,i.e.,when the long-wave approximation is no longer valid.For the convenience of band gap designs,we have also provided the design space from which one can easily obtain the proper mass and stiffness ratios corresponding to a requested band gap width. | Binying WANG Jinxing LIU A.K.SOH Naigang LIANG | 2022 | Applied Mathematics and Mechanics(English Edition)2022，43，1： | 1 |
| 17 | A small, linear, piezoelectric ultrasonic cryomotor显示文摘 | Dong Shuxiang Yah Li Wang Naigang | 2005 | Applied Physics Letters 862005，86，05： | 1 |
| 18 | A small, linear, piezoelectric cryomotor 显示文摘 | Dong Shuxiang Li Yan Wang Naigang | 2005 | Applied Physics Letters2005，86，： | 1 |
| 19 | An enlarged polygon method without binary variables for obstacle avoidance trajectory optimization显示文摘In this article,an Enlarged Polygon/Polyhedron(ELP)method without binary variables is proposed to represent the Convex Polygonal/Polyhedral Obstacle Avoidance(CPOA)constraints in trajectory optimization.First,the equivalent condition of a point outside the convex set is given and proved rigorously.Then,the ELP condition describing the CPOA constraints equivalently is given without introducing binary variables,and its geometric meaning is explained.Finally,the ELP method is used to transform the CPOA trajectory optimization problem into an optimal control problem without binary variables.The effectiveness and validity of ELP method are demonstrated through simulations with both simple linear dynamic model(unmanned aerial vehicle)and complex nonlinear dynamic model(hypersonic glide vehicle).Comparison indicates the computational time of ELP method is only 1%-20%of that of the traditional Mixed-Integer Programming(MIP)method. | Rouhe ZHANG Zihan XIE Changzhu WEI Naigang CUI | 2023 | Chinese Journal of Aeronautics2023，36，8： | 0 |
| 20 | A MULTI-DIMENSIONAL COMPOSITE MODEL FOR PLASTIC CONTINUA UNDER POLYAXIAL LOADING CONDITION显示文摘By replacing a medium with reinforcing components oriented and distributed uniformly in a mul-ti-dimensional space,a constitutive model is constructed.The components are extended/compressed compatiblywith the strain and the resultant of load exerted on them to balance the stress.Their load-elongation relation canbe determined from a conventional material test.Each component undergoes different elongation history dependingon its own orientation during deformation,so that the model can simulate elasto-plastic behavior of materials un-der polyaxial loading conditions.The incremental constitutive matrix bas been derived for application in numeri-cal analysis and a yield criterion is also introduced.A few subsequent yield surfaces have been predicted and com-pared with experiments. | Liang Naigang (Institute of Mechanics,Chinese Academy of Sciences,Beijing,100080,P.R.China)Pal G.Bergan (A.S.Veritas Research,P.O.Box 300,N-1322 Hφuik,Oslo,Norway) | 1990 | Acta Mechanica Sinica1990，6，4： | 0 |
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