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| 1 | An overview on flight dynamics and control approaches for hypersonic vehicles显示文摘With the capability of high speed flying, a more reliable and cost efficient way to access space is provided by hypersonic flight vehicles. Controller design, as key technology to make hypersonic flight feasible and efficient, has numerous challenges stemming from large flight envelope with extreme range of operation conditions, strong interactions between elastic airframe, the propulsion system and the structural dynamics.This paper briefly presents several commonly studied hypersonic flight dynamics such as winged-cone model,truth model, curve-fitted model, control oriented model and re-entry motion. In view of different schemes such as linearizing at the trim state, input-output linearization, characteristic modeling, and back-stepping, the recent research on hypersonic flight control is reviewed and the comparison is presented. To show the challenges for hypersonic flight control, some specific characteristics of hypersonic flight are discussed and the potential future research is addressed with dealing with actuator dynamics, aerodynamic/reaction-jet control, flexible effects,non-minimum phase problem and dynamics interaction. | XU Bin SHI ZhongKe | 2015 | Science China(Information Sciences)2015，58，7： | 58 |
| 2 | Variable Structure Control of Catastrophic Course in Airdropping Heavy Cargo显示文摘重型货物离机瞬间运输机数学模型发生突变,严重影响飞机空投时的安全性,对这一过程设计了变结构控制器。利用微分几何理论中的输入输出反馈线性化方法将非线性系统进行了线性化,在此基础上利用变结构滑模设计理论指数趋近律方法设计了速度与姿态的内环跟踪控制系统,并结合外环高度控制完成整个飞行控制系统的设计。数字仿真结果表明所设计的控制系统可以适用于货物离机突变过程,并对系统参数摄动具有较强的鲁棒性。 | Zhang Huiyuan Shi Zhongke | 2009 | Chinese Journal of Aeronautics2009，22，5： | 32 |
| 3 | Flight Controller Design of Transport Airdrop显示文摘在重负担的空投期间,当负担搬到抓住,飞行参数连续地变化,并且当负担放弃时,突然变化。这个过程败坏飞行质量和象负担特征的控制变得更重。基于简化空投飞行方程, backstepping 和开关控制方法被开发州的成立和骚乱 / 无常处理飞行(例如大规模飞行状况,飞行员操作错误,系统措施延期,等等) 在这份报纸的变细问题。而且,这些方法能作为一本参考书被使用飞行员在空投期间操作。与 backstepping 理论,当负担搬到抓住时,一个适应控制器为稳定运输的目的被综合,然后当条件在机身在机身的尾部从负担的存在跳到没有负担时,一个协调开关控制方法被用来控制飞机。模拟结果证明建议控制器不仅提供在空投期间的有效州的成立,而且在宽飞行条件以内完成柔韧的性能。 | CHEN Jie SHI Zhongke | 2011 | Chinese Journal of Aeronautics2011，24，5： | 18 |
| 4 | Signal overcomplete representation and sparse decomposition based on redundant dictionaries显示文摘Decomposing a signal based upon redundan dictionaries is a new method for data representation on sig- nal processing. It approximates a signal with an overcom- plete system instead of an orthonormal basis to provide a sufficient choice for adaptive sparse decompositions. Re- placing the original data with a sparse approximation can result in not only a higher compression ratio, but also greater flexibility in capturing the inherent structure of the natura signals with the redundancy of dictionaries. This paper gives an overview of a series of recent results in this field, and deals with the relationship between sparsity of signal de- composition and incoherence of dictionaries with BP and MP algorithms. The current and future challenges of the dic- tionary construction are discussed. | ZHANG Chunmei YIN Zhongke CHEN Xiangdong XIAO Mingxia | 2005 | Chinese Science Bulletin2005，50，23： | 13 |
| 5 | Dynamics modeling and control of large transport aircraft in heavy cargo extraction显示文摘In this paper,a novel version of six-degree-of-freedom nonlinear model for transport aircraft motion in cargo extraction is developed and validated by the theoretical mechanics and flight mechanics.In this model constraint force and moment reflecting the flight dynamic effects of inner moving cargo are formulated.A methodology for a control law design in this phase is presented,which linearizes the aircraft dynamics making use of piecewise linearization and utilizes robust control technique for interval system to achieve specified handling qualities with robustness to uncertainties.The simulations demonstrate adequate effectiveness and excellent robustness of the proposed controller. | Feng, Yanli Shi, Zhongke Tang, Wei | 2011 | 控制理论与应用(英文版)2011，9，2： | 9 |
| 6 | A formal model of fair exchange protocols显示文摘Based on the study of existing fair exchange protocols, this paper sets up an accurate formal model by stepwise refinement. In the process of refinement an unreliable channel is employed to simulate an attack behavior. The model provides a novel formal definition of exchanged items, and presents the formal goals for fairness, accountability, etc., reflecting the inherent requirements for fair exchange protocols across-the-board. In order to check, prove, and design fair exchange protocols effectively and efficiently, the model puts forward a novel property of abuse-freeness which applies to all fair exchange protocols, gives a formal definition for trust strand of the third party, and presents general criteria of designing a secure and effective fair exchange protocol. Taking a typical fair exchange protocol as an example, this paper presents the analysis steps of fair exchange protocols appealing to our model. An unknown attack is uncovered. The analysis reveals the process of a complete attack, discovering deeper reasons for causing an attack. Finally, we modify the flawed protocol and the revised protocol ensures the desirable properties. | QING Sihan1,2,3 & LI Gaicheng1,2,3 1. Engineering Research Center for Information Security Technology, Institute of Software, Chinese Aca- demy of Sciences, Beijing 100080, China 2. Beijing Zhongke Ansheng Corporation of Information Technology, Beijing 100080, China 3. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China | 2005 | Science in China(Series F)2005，48，4： | 9 |
| 7 | Application of a fourth-order relaxation scheme to hyperbolic systems of conservation laws显示文摘一个第四顺序的松驰计划被导出并且在一和二种空间尺寸适用于守恒定律的夸张系统。计划基于一第四顺序中央加权实质上非摆动(CWENO ) 为一个维的盒子的重建,它被 dimension-by-dimension 途径概括到二维的盒子。大稳定性领域 Runge-Kutta-type 解答者 ROCK4 被用于时间集成。产生方法也不要求 Riemann 解答者也不 Jacobians 的计算的使用,因此,它享受松驰计划的主要优点。高精确性和现在的方法的高分辨率的性质在一个维、二维的数字实验被表明。 | Jianzhong Chen Zhongke Shi | 2006 | Acta Mechanica Sinica2006，22，1： | 7 |
| 8 | Integrated erosion control measures and environmental effects in rocky mountainous areas in northern China显示文摘Based on observations of runoff plots and field investigations of gully cross-sections, impacts of various soil and water conservation measures on runoff and sediment yield are analyzed for different rainfall conditions. The results show that antecedent rainfall and rainfall intensity are the main factors affecting the runoff and soil erosion processes. Rainfall events with antecedent rainfall can produce high runoff and sediment yield. Large differences in the characteristics of two rainfall events will result in greater variations of total runoff and sediment yield from the same runoff plot. Under the same soil control measure and rainfall condition, soil and water conservation measures can reduce the impacts of antecedent rainfall and rainfall intensity on runoff and soil erosion. Among various measures, level terrace seems to be the greatest for soil conservation purposes. Combining with engineering measures,Vegetation measures is also effective in controlling runoff and soil erosion. In the initial stage of vegetation enclosure measures, engineering measure is necessary to improve the environment for ecological recovery. Gully head protection can control gully erosion effectively, but the effectiveness of gully head protection would be reduced when rainfall intensity increases. Therefore, the design of a gully head protection structure must be based on local hydrological conditions. | HE Jijun CAI Qiangguo LI Guoqiang WANG Zhongke | 2010 | International Journal of Sediment Research2010，25，3： | 7 |
| 9 | Bifurcation analysis and stability design for aircraft longitudinal motion with high angle of attack显示文摘Bifurcation analysis and stability design for aircraft longitudinal motion are investigated when the nonlinearity in flight dynamics takes place severely at high angle of attack regime. To predict the special nonlinear flight phenomena, bifurcation theory and continuation method are employed to systematically analyze the nonlinear motions. With the refinement of the flight dynamics for F-8 Crusader longitudinal motion, a framework is derived to identify the stationary bifurcation and dynamic bifurcation for high-dimensional system. Case study shows that the F-8longitudinal motion undergoes saddle node bifurcation, Hopf bifurcation, Zero-Hopf bifurcation and branch point bifurcation under certain conditions. Moreover, the Hopf bifurcation renders series of multiple frequency pitch oscillation phenomena, which deteriorate the flight control stability severely. To relieve the adverse effects of these phenomena, a stabilization control based on gain scheduling and polynomial fitting for F-8 longitudinal motion is presented to enlarge the flight envelope. Simulation results validate the effectiveness of the proposed scheme. | Xin Qi Shi Zhongke | 2015 | Chinese Journal of Aeronautics2015，28，1： | 5 |
| 10 | AN EXPERIMENTAL STUDY OF INFILTRATION AND EROSION UNDER SLOPE GRADIENTS AND VEGETAL COVERS显示文摘The effect of slope gradient and vegetal cover on soil infiltration and erosion were studied with field simulator. Results showed that infiltration decreases with slope gradients (especially for gradient less than 10°) and increases with vegetal covers, while soil erosion increases with slope gradients and decreases with vegetal covers. Fittlng the data by Philip’s infiltration equation it was found that in the equation, gravitational conductivity decreases with gradient and increases with vegetation, while diffusion decreases with vegetal cover and does not vary with slope gradient In the erosion process, the formation of a layer of thin water is crucial in dctermining the rainsplash and sheetwash. The increasing of erosion with slope gradient contributes mainly to the increase of velocity. | Jin Changxing Cai Qiangguo(Institute of Geography, CAS, Beijing 100101, China)Wang Zhongke(Soil Conservation Experimental Station, Zhangjiakou, Hebei Province 075000, China) | 1995 | Journal of Geographical Sciences1995，5，4： | 5 |
| 11 | Aircraft Flutter Modal Parameter Identification Using a Numerically Robust Least-squares Estimator in Frequency Domain显示文摘最近,基于频率最少平方(LS ) 评估者在识别飞机发现了宽申请拍翅参数。然而,当识别一个连续时间的模型时,频率方法经常被知道受不了数字困难特别,更宽广的频率或更高的顺序。在这篇文章,一个数字地柔韧的 LS 评估者基于向量,直角的多项式被建议解决 multivariable 系统的数字问题并且适用于测试的 flutter。这个方法的关键想法是由正确矩阵部分描述(RMFD ) 代表频率反应功能(FRF ) 矩阵在向量上为分子和分母多项式矩阵建模,并且膨胀直角的基础。作为结果,一个完美的数字条件(数字状况等于 1 ) 能为线性 LS 被获得评估者。最后,这个方法被验证由拍翅在一条风隧道和真实飞行的一个翅膀模型的测试拍翅一架飞机的测试。当它在 z 领域被建立,结果与有尤其是 LMS PolyMAX 的那些相比,它没被数字问题麻烦(例如源于一个分离时间的模型) 。确认证实了那除了克服数字问题,这个方法产出结果比得上与 LMS PolyMAX 获得的那些,或甚至更加擅长一些频率乐队。 | Tang Wei Shi Zhongke Chen Jie | 2008 | Chinese Journal of Aeronautics2008，21，6： | 5 |
| 12 | Identification of reduced-order model for an aeroelastic system from flutter test data显示文摘Recently, flutter active control using linear parameter varying(LPV) framework has attracted a lot of attention. LPV control synthesis usually generates controllers that are at least of the same order as the aeroelastic models. Therefore, the reduced-order model is required by synthesis for avoidance of large computation cost and high-order controller. This paper proposes a new procedure for generation of accurate reduced-order linear time-invariant(LTI) models by using system identification from flutter testing data. The proposed approach is in two steps. The well-known poly-reference least squares complex frequency(p-LSCF) algorithm is firstly employed for modal parameter identification from frequency response measurement. After parameter identification,the dominant physical modes are determined by clear stabilization diagrams and clustering technique. In the second step, with prior knowledge of physical poles, the improved frequencydomain maximum likelihood(ML) estimator is presented for building accurate reduced-order model. Before ML estimation, an improved subspace identification considering the poles constraint is also proposed for initializing the iterative procedure. Finally, the performance of the proposed procedure is validated by real flight flutter test data. | Tang Wei Wu Jian Shi Zhongke | 2017 | Chinese Journal of Aeronautics2017，30，1： | 4 |
| 13 | Anatomical and morphological characteristics of Populus euphratica in the lower reaches of Tarim River under extreme drought environment显示文摘Populus euphratica Oliv.is an old desert tree species that has been naturalized and invades zones along the watercourses in many arid and semiarid regions.The plant species developed some plasticity to adapt to the gradual environmental gradients.The aim of this study was to test the hypothesis that the changes in leaf morphology of P.euphratica reflect the adaptability of the plant to the unique environment of the lower reaches of Tarim River in China.The foliar architecture,blade epidermal and internal anatomies of P.euphratica were analyzed at different sites along the Tarim River.Compared with the abaxial surface of the leaves,their adaxial surface has more hairs,a greater stomatal density and opening,higher mesophyll proportion,and increased blade thickness,palisade width,and epidermal thickness.The long trichome of the roots found at site 6 in the Yinsu section may be an adapted structure of the plants in arid areas.The mature leaves of P.euphratica have comparatively more epidermis and cuticles,well developed palisades and more chloroplasts at different sites compared to the young leaves.Foliar morphological and anatomical variability in P.euphratica may be considered an adaptive advantage that enables leaves to develop and function in different habitats,marked by strong variations in solar radiation,air temperature,humidity and water table. | Li ZHUANG YaNing CHEN WeiHong LI ZhongKe WANG | 2011 | Journal of Arid Land2011，3，4： | 3 |
| 14 | Characterization of the immune defense related tissues,cells,and genes in amphioxus显示文摘Amphioxus is an important animal model for phylogenetic analysis,including comparative immunology.Exploring the immune system in amphioxus contributes to our understanding of the origin and evolution of the vertebrate immune system.We investigated the amphioxus immune system using ultrastructural examination and in situ hybridization.The expression patterns of TLR1(toll-like receptor 1),C1Q(complement component 1,q subcomponent),ECSIT(evolutionarily conserved signaling intermediate in Toll pathways),SoxC,DDAHa(Dimethylarginine dimethylaminohydrolase a),and NOS(nitric oxide synthase) show that these genes play key roles in amphioxus immunity.Our results suggest that the epidermis and alimentary canal epithelium may play important roles in immune defense,while macrophages located in the coelom and so-called lymph spaces may also be crucial immune cells. | LIN YuShuang CHEN DongYan ZHANG Wei CAI ZhaoPing CHEN ZhongKe ZHANG Ning MAO BingYu ZHANG HongWei | 2011 | Science China(Life Sciences)2011，54，11： | 2 |
| 15 | Diversity, novelty, antimicrobial activity, and new antibiotics of cultivable endophytic actinobacteria isolated from psammophytes collected from Taklamakan Desert显示文摘Three hundred and twenty endophytic actinobacterial strains were isolated from psammophytes collected from Taklamakan Desert and identified. Among them, three strains already had been identified as new species of two genera and sixteen isolates showed relatively low 16 S rRNA similarities < 98.6% to validly described species. Seventy-five of the isolates were selected as representative strains to screen antibacterial activity and mechanism. Forty-seven strains showed antagonistic activity against at least one of the indicator bacteria. Two Streptomyces strains produced bioactive compounds inducing DNA damage, and two Streptomyces strains produced bioactive compounds with inhibitory activity on protein biosynthesis. Notably, the strain Streptomyces sp. 8P21H-1 that demonstrated both strong antibacterial activity and inhibitory activity on protein biosynthesis was prioritized for exploring new antibiotics.Under the strategy of integrating genetics-based discovery program and MS/MS-based molecular networking, two new streptogramin-type antibiotics, i.e., acetyl-griseoviridin and desulphurizing griseoviridin, along with known griseoviridin, were isolated from the culture broth of strain 8P21H-1. Their chemical structures were determined by HR-MS, and 1D and 2D NMR. Desulphurizing griseoviridin and griseoviridin exhibited antibacterial activities by inhibiting translation. | Ting Wang Feina Li Qinpei Lu Gang Wu Zhongke Jiang Shaowei Liu Xugela Habden Elizaveta A.Razumova Ilya A.Osterman Petr V.Sergiev Olga A.Dontsova Xinxin Hu Xuefu You Chenghang Sun | 2021 | Journal of Pharmaceutical Analysis2021，11，2： | 2 |
| 16 | Bifurcation analysis of polynomial models for longitudinal motion at high angle of attack显示文摘To investigate the longitudinal motion stability of aircraft maneuvers conveniently, a new stability analysis approach is presented in this paper. Based on describing longitudinal aerodynamics at high angle-of-attack (a < 50 ) motion by polynomials, a union structure of two-order differential equation is suggested. By means of nonlinear theory and method, analytical and global bifurcation analyses of the polynomial differential systems are provided for the study of the nonlinear phenomena of high angle-of-attack flight. Applying the theories of bifurcations, many kinds of bifurcations, such as equilibrium, Hopf, homoclinic (heteroclinic) orbit and double limit cycle bifurcations are discussed and the existence conditions for these bifurcations as well as formulas for calculating bifurcation curves are derived. The bifurcation curves divide the parameter plane into several regions; moreover, the complete bifurcation diagrams and phase portraits in different regions are obtained. Finally, our conclusions are applied to analyzing the stability and bifurcations of a practical example of a high angle-of-attack flight as well as the effects of elevator deflection on the asymptotic stability regions of equilibrium. The model and analytical methods presented in this paper can be used to study the nonlinear flight dynamic of longitudinal stall at high angle of attack. | Shi Zhongke Fan Li | 2013 | Chinese Journal of Aeronautics2013，26，1： | 2 |
| 17 | Structure Optimization of Air Filter Based on Parametric Sensitivity显示文摘As the supporting supplier of the main engine plant, the general air filter manufacturers have insufficient technical reserves. The structural optimization of air filter is often based on the bench experiment, which has high implementation cost and poor performance. In view of this, taking computational fluid dynamics(CFD) as the basic technical means, an optimization design method based on parametric sensitivity combined with equidistant search was proposed. Specifically, the sensitivity of local structure parameters to pressure loss was analyzed by taking local structure of air filter as the object. According to the sensitivity, the method of equidistant search was used to optimize the parameters in order, so as to achieve the goal of overall optimization. After optimization, the pressure loss decreased by 45.13% and the effect was remarkable. | XIANG Feifei XIANG Zhongke CHENG Wenming | 2019 | Wuhan University Journal of Natural Sciences2019，24，3： | 2 |
| 18 | Automatic Identification of Clear-Air Echoes Based on Millimeter-wave Cloud Radar Measurements显示文摘Millimeter-wave cloud radar(MMCR)provides the capability of detecting the features of micro particles inside clouds and describing the internal microphysical structure of the clouds.Therefore,MMCR has been widely applied in cloud observations.However,due to the influence of non-meteorological factors such as insects,the cloud observations are often contaminated by non-meteorological echoes in the clear air,known as clear-air echoes.It is of great significance to automatically identify the clear-air echoes in order to extract effective meteorological information from the complex weather background.The characteristics of clear-air echoes are studied here by combining data from four devices:an MMCR,a laser-ceilometer,an L-band radiosonde,and an all-sky camera.In addition,a new algorithm,which includes feature extraction,feature selection,and classification,is proposed to achieve the automatic identification of clear-air echoes.The results show that the recognition algorithm is fairly satisfied in both simple and complex weather conditions.The recognition accuracy can reach up to 95.86%for the simple cases when cloud echoes and clear-air echoes are separate,and 88.38%for the complicated cases when low cloud echoes and clear-air echoes are mixed. | Ling YANG Yun WANG Zhongke WANG Qian YANG Xingang FAN Fa TAO Xiaoqiong ZHEN Zhipeng YANG | 2020 | Advances in Atmospheric Sciences2020，37，8： | 2 |
| 19 | Interactive modeling of 3D tree wit h ball B -Spline curves 显示文摘 | Zhongke W Mingquan Z Xingce W | 2009 | The Interna- tional Journal of Virtual Reality2009，8，2： | 1 |
| 20 | Stable and realistic crack pattern generation using a cracking node method显示文摘 | Juan ZHANG Fuqing DUAN Mingquan ZHOU Dongcan JIANG Xuesong WANG Zhongke WU Youliang HUANG Guoguang DU Shaolong LIU Pengbo ZHOU Xiangang SHANG | 2018 | Frontiers of Computer Science2018，12，4： | 1 |
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