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| 1 | Satellite range scheduling with the priority constraint: An improved genetic algorithm using a station ID encoding method显示文摘Satellite range scheduling with the priority constraint is one of the most important problems in the field of satellite operation.This paper proposes a station coding based genetic algorithm to solve this problem,which adopts a new chromosome encoding method that arranges tasks according to the ground station ID.The new encoding method contributes to reducing the complexity in conflict checking and resolving,and helps to improve the ability to find optimal resolutions.Three different selection operators are designed to match the new encoding strategy,namely random selection,greedy selection,and roulette selection.To demonstrate the benefits of the improved genetic algorithm,a basic genetic algorithm is designed in which two cross operators are presented,a single-point crossover and a multi-point crossover.For the purpose of algorithm test and analysis,a problem-generating program is designed,which can simulate problems by modeling features encountered in real-world problems.Based on the problem generator,computational results and analysis are made and illustrated for the scheduling of multiple ground stations. | Li Yuqing Wang Rixin Liu Yu Xu Minqiang | 2015 | Chinese Journal of Aeronautics2015，28，3： | 22 |
| 2 | Rescheduling of observing spacecraft using fuzzy neural network and ant colony algorithm显示文摘This paper aims at rescheduling of observing spacecraft imaging plans under uncertainties. Firstly, uncertainties in spacecraft observation scheduling are analyzed. Then, considering the uncertainties with fuzzy features, this paper proposes a fuzzy neural network and a hybrid rescheduling policy to deal with them. It then establishes a mathematical model and manages to solve the rescheduling problem by proposing an ant colony algorithm, which introduces an adaptive control mechanism and takes advantage of the information in an existing schedule. Finally, the above method is applied to solve the rescheduling problem of a certain type of earth-observing satellite.The computation of the example shows that the approach is feasible and effective in dealing with uncertainties in spacecraft observation scheduling. The approach designed here can be useful in solving the problem that the original schedule is contaminated by disturbances. | Li Yuqing Wang Rixin Xu Minqiang | 2014 | Chinese Journal of Aeronautics2014，27，3： | 19 |
| 3 | Effects of particle size on crushing and deformation behaviors of rockfill materials显示文摘Strength and deformation behaviors of rockfill materials,key factors for determining the stability of dams,pertain strongly to the grain crushing characteristics.In this study,single-particle crushing tests were carried out on rockfill materials with nominal particle diameters of 2.5 mm,5 mm and 10 mm to investigate the particle size effect on the single-particle strength and the relationship between the characteristic stress and probability of non-failure.Test data were found to be described by the Weibull distribution with the Weibull modulus of 3.24.Assemblies with uniform nominal grains were then subjected to one-dimensional compression tests at eight levels of vertical stress with a maximum of 100 MPa.The yield stress in one-dimensional compression tests increased with decreasing the particle size,which could be estimated from the single-particle crushing tests.The void ratio-vertical stress curve could be predicted by an exponential function.The particle size distribution curve increased obviously with applied stresses less than 16 MPa and gradually reached the ultimate fractal grading.The relative breakage index became constant with stress up to 64 MPa and was obtained from the ultimate grading at the fractal dimension(a?2:7).A hyperbolical function was also found useful for describing the relationship between the relative breakage index and input work during one-dimensional compression tests. | Yang Xiao Minqiang Meng Ali Daouadji Qingsheng Chen ZhijunWu Xiang Jiang | 2020 | Geoscience Frontiers2020，11，2： | 17 |
| 4 | Preparation of two kinds of superparamagnetic carriers-supported cis-platinum complexes and the compari-son of their characteristics显示文摘The purpose of the research is to ex- plore the effect of different surface modifiers in preparation of magnetic carriers-supported cis-plat- inum (CDDP) complex and their characteristics. So- dium alginate (SA) and N-oleoylsarcosine (NOSARK) were used respectively as linkers between CDDP and magnetic nanometer particles (MNP), and carri- ers-supported CDDP complex of carboxymethyl dex- tran (CM-dex) was used as the control. The physical and chemical characteristics of CDDP-MNP were measured by transmission electron microscope, photon correlation spectrum (PCS), spectrophotome- ter, etc. The advantages and disadvantages of the two linkers were analyzed through comparing the stability and quantity of reversibly bound CDDP. The cis-platinum magnetic nanometer particles were found to have the shape of approximately uniformly pellets under transmission electron microscope. The distribution of PCS diameter was 43―52 nm and the diameter of magnetic nucleus of CDDP- MNP com- plex was about 8.8±1.3 nm. The drug- loading ca- pacity of SA is larger than that of NOSARK, and similar to that of CM-dex. The SA-modified CDDP-MNP solution remained stable after being kept at 4℃ for 40 d. SA is superior to NOSARK as a magnetic nanoparticles surface modifier. Natural SA can supersede CM-dex to serve as linker between CDDP and MNP. In practical application, we should take both the maximal reversible CDDP-bonding capacity and CDDP utilization rate into consideration. | XIE Minqiang CHEN Shuaijun XU Xueqing LI Zhonghan SHEN Hui XU Jiarui | 2006 | Chinese Science Bulletin2006，51，2： | 11 |
| 5 | How does the initial free volume distribution affect shear band formation in metallic glass?显示文摘Introducing heterogeneities into the structure is an effective way to enhance the plasticity in metallic glasses (MGs). As natural heterogeneity, the original randomly distributed free volume in MGs has been found to be in favor of plasticity. However, the exact correlation between the free volume distribution and mechanical response is still unclear. In this paper, we investigate the shear banding in MGs with different structural disorders, characterized by both the free volume concentration (FVC) and the free volume dispersion (FVD). It is found that, either high FVC or wide FVD leads to low activation stress of shear band; wide FVD promotes the multiplication of shear bands but high FVC restricts it. It reveals that the yield strength in MGs is dependent on the amount of free volume while the plasticity mainly relies on the distribution. An optimum combination of the two aspects probably helps to design a MG of both good plasticity and high strength. | CHEN Yan JIANG MinQiang DAI LanHong | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，8： | 10 |
| 6 | Simultaneous state and actuator fault estimation for satellite attitude control systems显示文摘In this paper,a new nonlinear augmented observer is proposed and applied to satellite attitude control systems.The observer can estimate system state and actuator fault simultaneously.It can enhance the performances of rapidly-varying faults estimation.Only original system matrices are adopted in the parameter design.The considered faults can be unbounded,and the proposed augmented observer can estimate a large class of faults.Systems without disturbances and the fault whose finite times derivatives are zero piecewise are initially considered,followed by a discussion of a general situation where the system is subject to disturbances and the finite times derivatives of the faults are not null but bounded.For the considered nonlinear system,convergence conditions of the observer are provided and the stability analysis is performed using Lyapunov direct method.Then a feasible algorithm is explored to compute the observer parameters using linear matrix inequalities(LMIs).Finally,the effectiveness of the proposed approach is illustrated by considering an example of a closed-loop satellite attitude control system.The simulation results show satisfactory performance in estimating states and actuator faults.It also shows that multiple faults can be estimated successfully. | Cheng Yao Wang Rixin Xu Minqiang Li Yuqing | 2016 | Chinese Journal of Aeronautics2016，29，3： | 9 |
| 7 | Improving Joint Features and Mechanical Properties of Pinless Fiction Stir Welding of Alcald 2A12-T4 Aluminum Alloy显示文摘As a new solid state welding,pinless friction stir welding(PFSW) can be used to join thin-wall structures.In this study,four new pinless tools with different groove distributions were designed and manufactured in order to enrich technological storage of PFSW and obtain sound joint with high quality of alclad 2A12-T4 alloy.The results show that the small-obliquity tool is detrimental to the transfer of plasticized materials,resulting in the formation of kissing bond defect.For the through-groove tool or the large-curvature tool,bigger flashes form on the joint surface and alclad layer is observed in the nugget zone(NZ),deteriorating mechanical properties.Compared with the above-mentioned three tools,using the six-groove tool with rational curvature and obliquity can not only yield sound joint with small flashes and thickness reduction,but also prevent alclad from flowing into NZ,which has potential to weld thin alclad aluminum alloys.Meanwhile,the tensile strength and elongation of joint using the six-groove tool reach the maximum values of 362 MPa and 8.3%,up to 85.1% and 64% of BM. | Zhenlei Liu Hutao Cui Shude Ji Minqiang Xu Xiangchen Meng | 2016 | Journal of Materials Science & Technology2016，32，12： | 7 |
| 8 | Reliability-based Maintenance Optimization under Imperfect Predictive Maintenance显示文摘The reliability-based maintenance optimization model has been focused by the engineers and scholars but it has never been solved effectively to formulate the effect of a maintenance action on the optimization model.In existing works,the system reliability was assumed to be increased to 1 after a predictive maintenance.However,it is very difficult in the most practical systems.Therefore,a new reliability-based maintenance optimization model under imperfect predictive maintenance (PM) is proposed in this paper.In the model,the system reliability is only restored to Ri (0 | LI Changyou ZHANG Yimin XU Minqiang | 2012 | Chinese Journal of Mechanical Engineering2012，25，1： | 6 |
| 9 | Nonlinear regression model for peak-failure strength of rockfill materials in general stress space显示文摘A nonlinear regression model for peak-failure strength prediction of rockfill materials is proposed. It is based on the relationship between the peak-failure stress ratio and the normalized confining pressure as well as the relationship between the normalized peak-failure stress ratio and the exponent function of the intermediate principal stress ratio. This model can well predict the variations of the peak-failure stress ratio with the initial confining pressure and the intermediate principal stress ratio for different rockfill materials under different general stress paths. Comparisons of the measured and predicted results show that the peak-failure strength under the constant-p' and constant-b path is larger than that under the constant-σ'_3 and constant-b path. The predictive capacity of the proposed model for the peakfailure stress ratio is better than that for the peak-failure friction angle. | Yang Xiao Minqiang Meng Hui Chen Xiang He Jinyu Ran Weicheng Shi | 2018 | Geoscience Frontiers2018，9，6： | 6 |
| 10 | Optical flow based guidance system design for semi-strapdown image homing guided missiles显示文摘This paper focuses mainly on semi-strapdown image homing guided(SSIHG) system design based on optical flow for a six-degree-of-freedom(6-DOF) axial-symmetric skid-to-turn missile. Three optical flow algorithms suitable for large displacements are introduced and compared.The influence of different displacements on computational accuracy of the three algorithms is analyzed statistically. The total optical flow of the SSIHG missile is obtained using the Scale Invariant Feature Transform(SIFT) algorithm, which is the best among the three for large displacements.After removing the rotational optical flow caused by rotation of the gimbal and missile body from the total optical flow, the remaining translational optical flow is smoothed via Kalman filtering. The circular navigation guidance(CNG) law with impact angle constraint is then obtained utilizing the smoothed translational optical flow and position of the target image. Simulations are carried out under both disturbed and undisturbed conditions, and results indicate the proposed guidance strategy for SSIHG missiles can result in a precise target hit with a desired impact angle without the need for the time-to-go parameter. | Huang Lan Song Jianmei Zhang Minqiang Cai Gaohua | 2016 | Chinese Journal of Aeronautics2016，29，5： | 5 |
| 11 | Model-Based Degree Estimation of Unbalance and Misalignment in Flexible Coupling-rotor System显示文摘The condition of rotor system must be assessed in order to develop condition-based maintenance for rotating machinery. It is determined by multiple variables such as unbalance degree,misalignment degree,the amount of bending deformation of the shaft,occurrence of shaft crack of rotor system and so on. The estimation of the degrees of unbalance and misalignment in flexible coupling-rotor system is discussed. The model-based approach is employed to solve this problem. The models of the equivalent external loads for unbalance and misalignment are derived and analyzed. Then,the degrees of unbalance and misalignment are estimated by analyzing the components of the equivalent external loads of which the frequencies are equal to the 1 and 2 times running frequency respectively. The equivalent external loads are calculated according to the dynamic equation of the original rotor system and the differences between the dynamical responses in normal case and the vibrations when the degree of unbalance or misalignment or both changes. The denoise method based on bandpass filter is used to decrease the effect of noise on the estimation accuracy. The numerical examples are given to show that the proposed approach can estimate the degrees of unbalance and misalignment of the flexible coupling-rotor system accurately. | LI Changyou XU Minqiang GUO Song WANG Yuewu WANG Rixin | 2009 | Chinese Journal of Mechanical Engineering2009，22，4： | 5 |
| 12 | Fault detection of flywheel system based on clustering and principal component analysis显示文摘Considering the nonlinear, multifunctional properties of double-flywheel with closedloop control, a two-step method including clustering and principal component analysis is proposed to detect the two faults in the multifunctional flywheels. At the first step of the proposed algorithm,clustering is taken as feature recognition to check the instructions of ‘‘integrated power and attitude control' system, such as attitude control, energy storage or energy discharge. These commands will ask the flywheel system to work in different operation modes. Therefore, the relationship of parameters in different operations can define the cluster structure of training data. Ordering points to identify the clustering structure(OPTICS) can automatically identify these clusters by the reachability-plot. K-means algorithm can divide the training data into the corresponding operations according to the reachability-plot. Finally, the last step of proposed model is used to define the relationship of parameters in each operation through the principal component analysis(PCA) method.Compared with the PCA model, the proposed approach is capable of identifying the new clusters and learning the new behavior of incoming data. The simulation results show that it can effectively detect the faults in the multifunctional flywheels system. | Wang Rixin Gong Xuebing Xu Minqiang Li Yuqing | 2015 | Chinese Journal of Aeronautics2015，28，6： | 5 |
| 13 | EQUIVALENT MODEL OF EXPANSION OF CEMENT MORTAR UNDER SULPHATE EROSION显示文摘在硫酸盐离子的攻击下面的水泥臼的扩大性质被试验性、理论的方法学习。首先,水泥臼与水的比率被制作到 0.4, 0.6,和 0.8 的水泥。第二,标本的扩大在硫酸盐答案埋头了在不同时间被测量。第三,在硫酸盐侵蚀下面的水泥臼的扩大的一个理论模型被优点建议代表体积元素方法。在这个模型,损坏进化由于在推迟的 ettringite 和水泥臼之间的相互作用被考虑。最后,数字计算被执行。数字、试验性的结果显示模型完美地描述水泥臼的扩大。 | Jue Zhu Minqiang Jiang Jiankang Chen | 2008 | Acta Mechanica Solida Sinica2008，21，4： | 5 |
| 14 | Microstructural characteristics and mechanical behavior of B4Cp/6061Al composites synthesized at different hot-pressing temperatures显示文摘B4Cp/6061Al composites have become important structural and functional materials and can be fabricated by powder metallurgy and subsequent hot rolling. In this work, the effects of the hot-pressing temperature on microstructures and mechanical behaviors of the B4Cp/6061Al composites were investigated. The results showed that compared with the T4 heat treated B4Cp/6061Al composite hot pressed at 560℃, the yield strength and failure strain of the composites hot pressed at 580℃ were increased to 235 MPa and 18.4%, respectively. This was associated with the interface bonding strength between the B4C particles and the matrix. However, the reaction products, identified to be MgAl2O4 phases, were detected in the composites hot pressed at 600℃. The formation of the MgAl2O4 phases resulted in the Mg depletion, thus reducing the yield strength to 203.5 MPa after the T4 heat treatment due to the effect of the solid solution strengthening being weakened. In addition, the variation of hardness and electrical conductivity was mainly related to the Mg content in the matrix. Based on the as-rolled microstructures observed by SEM, SR-μCT and fracture surfaces, the deformation schematic diagram was depicted to reflect the tensile deformation process of the composites. | Minqiang Gao Zongning Chen Huijun Kang Enyu Guo Rengeng Li Ying Fu Honglan Xie Tongmin Wang | 2019 | Journal of Materials Science & Technology2019，35，8： | 4 |
| 15 | MoP nanoparticles with a P-rich outermost atomic layer embedded in N-doped porous carbon nanofibers: Self-supported electrodes for efficient hydrogen generation显示文摘尽管有很长时间被追求,经由切开的水的氢生产仍然由于持久、有效的催化剂的缺乏主要是巨大的挑战。铝磷化物(拖把) 理论上能够有效的氢进化反应(她的) 然而,仍然有的催化作用为在它的表演的进一步的改进的空间。此处,我们为经由互补理论、试验性的确认提高她与 P 富有的最外面的原子层为拖把建议一个图案。计算结果的关联建议拖把的终止 P 的表面在决定它的高效率的催化性质起一个关键作用。我们由使用做 N 的多孔的碳(MoP@NPCNFs ) 在拖把的表面上捕获更多的 P 并且限制 nanoparticles 的生长制作了拖把 nanoparticles 的 P 富有的最外面的原子层。进一步,同样准备的材料能直接作为 self-supported electrocatalyst 被采用,并且它在酸的媒介为她展出显著 electrocatalytic 活动;它也与催化活动的可以忽略的损失为多达 5,000 个周期揭示优秀长期的耐久性。 | Minqiang Wang Cui Ye Maowen Xu Shujuan Bao | 2018 | Nano Research2018，11，9： | 4 |
| 16 | XCO_2 satellite retrieval experiments in short-wave infrared spectrum and ground-based validation显示文摘Based on the optimal estimation method, a satellite XCO2 retrieval algorithm was constructed by combining LBLRTM with VLIDORT. One-year GOSAT/TANSO observations over four TCCON stations were tested by our algorithm, and retrieval results were compared with GOSAT L2 B products and ground-based FTS measurements. Meanwhile, the influence of CO2 line mixing effect on retrieval was estimated, and the research showed that neglecting CO2 line mixing effect could result in approximately 0.25% XCO2 underestimation. The accuracy of XCO2 retrievals was similar to GOSAT L2 B products at cloud-free footprints with aerosol optical depth less than 0.3, and 1% accuracy of XCO2 retrievals can be reached based on the validation result with TCCON measurements. | ZHOU MinQiang ZHANG XingYing WANG PuCai WANG ShuPeng GUO LiLi HU LieQun | 2015 | Science China Earth Sciences2015，58，7： | 4 |
| 17 | Fast recognition using convolutional neural network for the coal particle density range based on images captured under multiple light sources显示文摘A method based on multiple images captured under different light sources at different incident angles was developed to recognize the coal density range in this study.The innovation is that two new images were constructed based on images captured under four single light sources.Reconstruction image 1 was constructed by fusing greyscale versions of the original images into one image,and Reconstruction image2 was constructed based on the differences between the images captured under the different light sources.Subsequently,the four original images and two reconstructed images were input into the convolutional neural network AlexNet to recognize the density range in three cases:-1.5(clean coal) and+1.5 g/cm^(3)(non-clean coal);-1.8(non-gangue) and+1.8 g/cm^(3)(gangue);-1.5(clean coal),1.5-1.8(middlings),and+1.8 g/cm^(3)(gangue).The results show the following:(1) The reconstructed images,especially Reconstruction image 2,can effectively improve the recognition accuracy for the coal density range compared with images captured under single light source.(2) The recognition accuracies for gangue and non-gangue,clean coal and non-clean coal,and clean coal,middlings,and gangue reached88.44%,86.72% and 77.08%,respectively.(3) The recognition accuracy increases as the density moves further away from the boundary density. | Feiyan Bai Minqiang Fan Hongli Yang Lianping Dong | 2021 | International Journal of Mining Science and Technology2021，31，6： | 4 |
| 18 | Dynamic properties of polyurethane foam adhesive-reinforced gravels显示文摘Polyurethane foam adhesive(PFA)has been introduced as an alternative stabilizer in geotechnical applications because PFA can improve the engineering characteristics of soil by filling the pore space and generating adhesive bonding among the particles.However,the dynamic properties of PFA-reinforced soils are not well understood.To analyze the dynamic characteristics of PFA-reinforced gravels,a series of cyclic triaxial tests were carried out to investigate the shear modulus and damping ratio of PFA-reinforced gravels,and to determine the corresponding effects of the PFA content,confining pressure,consolidation stress ratio and loading frequency.The results showed that the shear modulus increased,and the damping ratio decreased as the PFA content,confining pressure and consolidation stress ratio increased.In contrast,the effect of the loading frequency,which ranged from 0.05 to 1 Hz,was negligible.A modified hyperbolic empirical model can consider the effect of the PFA content on the maximum shear modulus and predict the relationship between the normalized shear modulus and the normalized shear strain was proposed.Moreover,the upper and lower bounds of the damping ratio were also proposed. | LIU Ping MENG MinQiang XIAO Yang LIU HanLong YANG Gui | 2021 | Science China(Technological Sciences)2021，64，3： | 3 |
| 19 | Amorphous TiO_2-supported Keggin-type ionic liquid catalyst catalytic oxidation of dibenzothiophene in diesel显示文摘Supported ionic liquid(IL) catalysts [C_nmim]_3PMo_(12)O_(40)/Am TiO_2(amorphous TiO_2) were synthesized through a one-step method for extraction coupled catalytic oxidative desulfurization(ECODS) system. Characterizations such as FTIR, DRS,wide-angle XRD, N_2 adsorption–desorption and XPS were applied to analyze the morphology and Keggin structure of the catalysts. In ECODS with hydrogen peroxide as the oxidant, it was found that ILs with longer alkyl chains in the cationic moiety had a better effect on the removal of dibenzothiophene. The desulfurization could reach 100% under optimal conditions, and GC–MS analysis was employed to detect the oxidized product after the reaction. Factors affecting the desulfurization efficiencies were discussed, and a possible mechanism was proposed. In addition, cyclic experiments were also conducted to investigate the recyclability of the supported catalyst. The catalytic activity of [C_(16)mim]_3 PMo_(12)O_(40)/Am TiO_2 only dropped from 100% to 92.9% after ten cycles, demonstrating the good recycling performance of the catalyst and its potential industrial application. | Zhendong Yu Donghui Wang Suhang Xun Minqiang He Ruliang Ma Wei Jiang Hongping Li Wenshuai Zhu Huaming Li | 2018 | Petroleum Science2018，15，4： | 3 |
| 20 | Enhancing mechanical properties and corrosion resistance of nickel-aluminum bronze via hot rolling process显示文摘The mechanical properties and corrosion behavior of as-cast, as-annealed and hot-rolled nickelaluminum bronze(NAB) alloy(Cu-9 Al-10 Ni-4 Fe-1.2 Mn, all in wt.%) in 3.5 wt.% Na Cl solution were investigated. The results show that annealing introduces a large number of k phases to precipitate in the k phase. However, after further hot rolling, the original continuous k phases are spheroidized and dispersed, increasing the strength, hardness, and elongation of the alloy. In addition to the enhanced mechanical properties, the corrosion resistance of the NAB samples is also improved significantly by hot rolling, as revealed by the mass loss measurements, electrochemical impedance spectroscopy(EIS), and cross-sectional corrosion morphology. Selective phase corrosion occurs by the preferential corrosion of the k phase, which acts as an anode to the k phases, and the uncorroded k phases are retained in the corrosion product film. The interfaces between the k phases and the surrounding corrosion products become discontinuous caused by the spheroidization of k phases, reducing the corrosion of the substrate by the corrosive medium via the channels. As a result, the corrosion rate and the maximum local corrosion depth of the hot-rolled NAB sample are greatly reduced. | Yanhua Zeng Fenfen Yang Zongning Chen Enyu Guo Minqiang Gao Xuejian Wang Huijun Kang Tongmin Wang | 2021 | Journal of Materials Science & Technology2021，，2： | 3 |
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