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| 1 | 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 |
| 2 | UPF based autonomous navigation scheme for deep space probe显示文摘The autonomous 'celestial navigation scheme' for deep space probe departing from the earth and the autonomous 'optical navigation scheme' for encountering object celestial body are presented. Then, aiming at the conditions that large initial estimation errors and non-Gaussian distribution of state or measurement errors may exist in orbit determination process of the two phases, UPF (unscented particle filter) is introduced into the navigation schemes. By tackling nonlinear and non-Gaussian problems, UPF overcomes the accuracy influence brought by the traditional EKF (extended Kalman filter), UKF (unscented Kalman filter), and PF (particle filter) schemes in approximate treatment to nonlinear and non-Gaussian state model and measurement model. The numerical simulations demonstrate the feasibility and higher accuracy of the UPF navigation scheme. | Li Peng Cui Hutao Cui Pingyuan | 2008 | Journal of Systems Engineering and Electronics2008，19，3： | 7 |
| 3 | Effects of cecropin-XJ on growth and adherence of oral cariogenic bacteria in vitro显示文摘Background CecropinXJ belongs to cecropinB, which is the most potent antibacterial peptide found naturally The aim of this study was to investigate the effects of cecropinXJ on growth and adherence of oral cariogenic bacteriaMethods Four oral cariogenic bacteria (Streptococcus mutans, Lactobacillus acidophilus, Actinomyces viscosus and Actinomyces naeslundii) were chosen for this experiment The minimal inhibitory concentrations (MICs) and reductive percent of bacterial growth were used to assay the antibacterial activity of cecropinXJ Mammalian cytotoxicity of cecropinXJ was tested with human periodontal membrane fibroblasts by tetrazolium (MTT) colorimetric assay The bacterial morphological changes induced by cecropinXJ were examined on scanning electron microscope (SEM) The influence of cecropinXJ on bacterial adhesion to salivacoated hydroxyapatite (SHA) was measured by scintillation countingResults The MICs of cecropinXJ for inhibition of the growth of four bacteria ranged from 40 to 428 μmol/L with the highest susceptible to A naeslundii and the lowest susceptible to L acidophilus At pH 68, 55 and 82, 1/2 MIC of cecropinXJ reduced the number of viable bacteria by 409%, 678% and 328% for S mutans and by 281%, 572% and 379% for L acidophilus The activities against Smutans and L acidophilus increased at pH 55 compared with pH 68 (P<001, respectively) In present of 50% saliva, 1/2 MIC of the peptide decreased the direct count of viable cells by 292% and 144% for S mutans and L acidophilus, respectively (P<001 and P>005, respectively), whereas almost no reduction counts were detected in the presence of 20% serum for both bacteria (P>005, respectively) Mammalian cytotoxicity of cecropinXJ from 10 to 100 μmol/L exhibited no cytotoxicity against human periodontal membrane fibroblasts (P>005) Bacterial morphological changes induced by MIC of cecropinXJ examined on SEM showed cell surface disruption Furthermore, the ability of A naeslundii adhesion to SHA decreased significantly with MIC of cecropinXJ for 10 and 20 minutes (P=0001 and 0000, respectively), and S mutans, A viscosus to SHA decreased significantly with MIC of cecropinXJ for 20 minutes( P=0000, respectively) Conclusions CecropinXJ exhibited bactericidal action against cariogenic pathogens, and the antibacterial activity enhanced in the acid environment The results also demonstrate that cecropinXJ prevents S mutans and actinomyces adsorption to SHA These findings suggest that CecropinXJ may have potential to prevent | HAOYu-qing ZHOUXue-dong XIAOXiao-rong LUJun-jun ZHANGFu-chun HUTao WUHong-kun CHENXin-mei | 2005 | Chinese Medical Journal2005，，2： | 6 |
| 4 | Anti-unwinding attitude maneuver control of spacecraft considering bounded disturbance and input saturation显示文摘The attitude maneuver control of spacecraft under bounded disturbance and input saturation is investigated in this paper.Using the Lyapunov stability theory,an anti-saturation sliding mode control algorithm is given by designing a time-varying sliding mode to solve the input saturated attitude control problem without disturbance.Then combining the merit in anti-saturation of time-varying sliding mode controller with the merit in anti-disturbance of time-invariant sliding mode controller,a switching strategy between the two controllers is designed to solve the attitude maneuver control problem under input saturation and bounded disturbance.However,double value of quaternions makes the attitude slewing unwinding.To solve the problem,an attitude error vector is designed.Based on the error vector,a modified sliding mode control algorithm is proposed which simultaneously has the ability of anti-saturation,anti-disturbance and anti-unwinding.Simulation results show that the algorithm in this paper is feasible and effective. | CUI HuTao CHENG XiaoJun | 2012 | Science China(Technological Sciences)2012，55，9： | 5 |
| 5 | Disturbance observer-based robust guidance for Mars atmospheric entry with input saturation显示文摘With low-lifting capability taken into account,a robust guidance law for Mars entry vehicles with low lift-to-drag ratios,such as Mars Science Laboratory(MSL),is presented.Consider the nonlinear term in the drag dynamic equation and bounded disturbances as a lumped disturbance,and design a linear disturbance observer(DOB)to estimate it.With the consideration of the control input saturation,an innovative sliding surface and a virtual system are introduced to design the guidance law.Analyses of disturbance observer performance and Lyapunov-based transient performance are also presented.It is shown that the drag tracking error can be adjustable by explicit choices of design parameters.Simulation results confirm the effectiveness of the proposed guidance law. | Zheng Yiyu Cui Hutao | 2015 | Chinese Journal of Aeronautics2015，28，3： | 4 |
| 6 | Synthesis and Characteristics of an Aspartame Analogue,L-Asparaginyl L-3-Phenyllactic Acid Methyl Ester显示文摘An aspartame analogue, L-asparaginyl L-3-phenyllactic acid methyl ester was synthesized with aspartic acid replaced by asparagine and peptide bond replaced by ester bond. The aspartic acid of aspartame could be replaced by asparagine as reported in the literature. In this analogue, the hydrogen of amide group could still form a hydrogen bond with the oxygen of ester bond and the ester bond was isosteric with peptide bond. However, the product was not sweet, showing that the peptide bond could not be replaced by ester bond. The peptide C-N bond behaves as a double bond that is not free to rotate and the C, O, N and H atoms are in the same plane. The replacement of peptide bond by ester bond destroyed the unique conformation of peptide bond, resulting in the loss of sweet taste. | HuTAO Da-FuCUI You-ShangZHANG | 2004 | Acta Biochimica et Biophysica Sinica2004，36，6： | 3 |
| 7 | 显示文摘 | LiZhengxian(李争显) HuTao(胡涛) LiuDaoxin(刘道新) etal | | 稀有金属材料与工程0，，： | 3 |
| 8 | Vision-aided inertial navigation for pinpoint planetary landing显示文摘 | Shuang Li Pingyuan Cui Hutao Cui | 2007 | Aerospace Science and Technology2007，，6： | 2 |
| 9 | An improved nonlinear control strategy for deep space formation flying spacecraft显示文摘This paper aims to provide further study on thenonlinear modeling and controller design of formation flyingspacecraft in deep space missions. First, in the Sun-Earthsystem, the nonlinear formation dynamics for the circularrestricted three-body problem (CRTBP) and elliptic restrictedthree-body problem (ERTBP) are presented. Then, with theFloquet mode method, an impulsive controller is developedto keep the Chief on the desired Halo orbit. Finally, anonlinear adaptive control scheme based on Nonzero set-point LQR and neural network is proposed to achieve highprecision formation maneuver and keeping. The simulationresults indicate that the proposed nonlinear control strategyis reasonable as it considers not only the orbit keeping of theChief, but also the formation modeling inaccuracy. Moreover,the nonlinear adaptive control scheme is effective toimprove the control accuracy of the formation keeping. | Peng Li Pingyuan Cui Hutao Cui Deep Space Exploration Research Center,Harbin Institute of Technology, 150080 Harbin, China | 2009 | Acta Mechanica Sinica2009，25，6： | 2 |
| 10 | Silk‐Based Conformal, Adhesive, Edible Food Sensors显示文摘 | HuTao Mark A.Brenckle MiaomiaoYang JingdiZhang MengkunLiu Sean M.Siebert Richard D.Averitt Manu S.Mannoor Michael C.McAlpine John A.Rogers David L.Kaplan Fiorenzo G.Omenetto | 2012 | Adv Mater2012，，8： | 1 |
| 11 | Metamaterial Silk Composites at Terahertz Frequencies显示文摘 | HuTao Jason J.Amsden Andrew C.Strikwerda KebinFan David L.Kaplan XinZhang Richard D.Averitt Fiorenzo G.Omenetto | 2010 | Adv Mater2010，，32： | 1 |
| 12 | Vision-aided inertial navigation for pinpoint planetary landing显示文摘 | LI Shuang CUI Pingyuan CUI Hutao | 2007 | Aerospace Science and Technology2007，11，6： | 1 |
| 13 | Vision-aided inertial navigation for pinpoint planetary landing 显示文摘 | LI Shuang CuI Pingyuan Cu: Hutao | 2007 | Aerospace Science and Technology2007，11，6： | 1 |
| 14 | Autonomous navigation and guidance for landing on asteroids显示文摘 | SHUANG L PINGYUAN C HUTAO C | 2006 | Aerospace Science and Tchnology2006，10，3： | 1 |
| 15 | Ivar asteroid rendezvous mission system scenario and trajectory design显示文摘 | CUI Pingyuan LI litao and CUI Hutao | 2003 | Joumal of Harbin Institute of Technology2003，10，3： | 1 |
| 16 | Vision- aided inertial navigation for pinpoint planetary landing 显示文摘 | Li Shuang Cui Pingyuan Cui Hutao | 2007 | Aerospace Science and Technology2007，，11： | 1 |
| 17 | Vision-aided inertial navigation for pinpoint planetary landing 显示文摘 | LIShuang CUI Pingyuan CUI Hutao | 2007 | Aerospace Scienee and Teehnology2007，11，6： | 1 |
| 18 | Vision-aided inertial navigation for pinpoint planetary landing 显示文摘 | Li Shuang Cui Pingyuan Cui Hutao | 2007 | Aerospace Science and Technology (S 1270-9638)2007，11，6： | 1 |
| 19 | Vision-aided in-ertial navigation for pinpoint planetary landing显示文摘 | Li Shuang Cui Pingyuan Cui Hutao | 2007 | Aerospace Science and Technology2007，11，6： | 1 |
| 20 | Autonomous navigation and guidance for landing on asteroids显示文摘 | Shuang Li Pingyuan Cui Hutao Cui | 2005 | Aerospace Science and Technology2005，，3： | 1 |
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