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| 1 | Weighted adaptive filtering algorithm for carrier tracking of deep space signal显示文摘Carrier tracking is laid great emphasis and is the difficulty of signal processing in deep space communication system.For the autonomous radio receiving system in deep space, the tracking of the received signal is automatic when the signal to noise ratio(SNR) is unknown.If the frequency-locked loop(FLL) or the phase-locked loop(PLL) with fixed loop bandwidth, or Kalman filter with fixed noise variance is adopted, the accretion of estimation error and filter divergence may be caused.Therefore, the Kalman filter algorithm with adaptive capability is adopted to suppress filter divergence.Through analyzing the inadequacies of Sage–Husa adaptive filtering algorithm, this paper introduces a weighted adaptive filtering algorithm for autonomous radio.The introduced algorithm may resolve the defect of Sage–Husa adaptive filtering algorithm that the noise covariance matrix is negative definite in filtering process.In addition, the upper diagonal(UD) factorization and innovation adaptive control are used to reduce model estimation errors,suppress filter divergence and improve filtering accuracy.The simulation results indicate that compared with the Sage–Husa adaptive filtering algorithm, this algorithm has better capability to adapt to the loop, convergence performance and tracking accuracy, which contributes to the effective and accurate carrier tracking in low SNR environment, showing a better application prospect. | Song Qingping Liu Rongke | 2015 | Chinese Journal of Aeronautics2015，28，4： | 7 |
| 2 | The detection of tetrahydrofuran hydrate formation and saturation using magnetic resonance imaging technique显示文摘Tetrahydrofuran(THF) hydrate was formed in bulk as well as in glass beads pack with a mean diameter of 3.0 mm by controlling the temperature under ambient pressure.Images of THF hydrate formation procedure were obtained using the magnetic resonance imaging(MRI) technique.The experiment results showed that MRI is an effective method for the detection of hydrate formation.Saturation of hydrate formed both in bulk and glass beads can be confirmed by intensity integration of MRI images. | Yu Liu Yongchen Song Yongjun Chen Lei Yao Qingping Li | 2010 | Journal of Natural Gas Chemistry2010，19，3： | 2 |
| 3 | Role of microstructure in the thermomechanical behaviour of SMA composites 显示文摘 | Song Guquan Sun Qingping Cherkaoui M | 1999 | Transactions of the ASME1999，121，1： | 1 |
| 4 | Tumor necrosis factor 2αinduces apop to2 sis via inducible nitric oxide synthase in neonatal mouse cardiomyo2 cytes 显示文摘 | Song Wei Lu Xingru Feng Qingping | 2000 | Cardiovasc Res2000，45，： | 1 |
| 5 | Synthesis of Poly(acrylic acid)-Grafted Carboxymethyl Cellulose for Efficient Removal of Copper Ions显示文摘Biocompatible and high content grafted carboxymethyl cellulose-g-poly(acrylic acid)powder was successfully synthesized in an aqueous system,and used as adsorbents for the removal of Cu(II)in aqueous solution.The copolymer was characterized by FT-IR and SEM techniques.Graft copolymerization introduced a large number of carboxyl groups in the polymer and caused the micro-surface of the material to be porous.The fundamental adsorption behaviors of the material were studied.The adsorption kinetics was well fitted with pseudo-second order equation,while the adsorption isotherm preferred to be described the Langmuir equation.The maximum adsorption capacity obtained from the Langmuir model was 154.32 mg/g,indicating that the adsorption capacity of carboxymethyl cellulose was improved remarkably after grafting poly(acrylic acid).Moreover,Fourier transform infrared spectroscopy(FT-IR)has been used to investigate the adsorption mechanisms at molecular levels,which revealed that carboxyl groups are facile to form bidentate carboxylates with metal ions.Thus,this environment friendly copolymer will be a promising candidate for application in removal of heavy metal ions. | Ying Lin Yihua Cao Qingping Song Jiangang Gao Puyou Jia Hamed Alsulami Marwan Amin Kutbi | 2019 | Journal of Renewable Materials2019，7，12： | 1 |
| 6 | Large Curvature Folding Strategies of Butterfly Proboscis显示文摘Due to its real-time control,high folding ratio,and structure self-locking,flexible large curvature self-folding devices have broad application prospects,such as foldable human implants,flexible electronics,and flexible robots.Driven by this background,flexible large curvature folding butterfly(Polyura eudamippus)proboscises were studied in this work.The folding ratio of the proboscises was about 15.The curvature of coiled proboscises ranged from about 150 m_1 to 880 m The external and internal structures of the proboscises were studied by different methods.Three main strategies for large-curvature folding of proboscises were identified:a gradual decrease in thickness,a lower elastic modulus,and(most importantly)large numbers of regular corrugated cracks arranged on the surface.These corrugated cracks can effectively accommodate the coiled strain and provide space for the large curvature folding of proboscises.Finally,a 4D printed coiled sample with corrugated cracks was fabricated to mimic the proboscises stretching process.Large-curvature folding strategies,based on these proboscises,provide insights for the biomimetic design of artificial highly folded components. | Daobing Chen Honglie Song Qingping Liu Jie Gan Yang Liu Keyu Che' Chong Wang Shifeng Wen Yan Zhou Chunze Yan Junqiu Zhang Yusheng Shi Zhiwu Han | 2020 | Journal of Bionic Engineering2020，17，6： | 1 |
| 7 | Role of microstruc tureinthethermomechanicalbehaviourofSMAcomposites 显示文摘 | Song Guquan Sun Qingping Cherkaoui M | 1999 | Transactions of the ASME1999，121，1： | 1 |
| 8 | Development of Heart Failure and Congenital Septal Defects in Mice Lacking Endothelial Nitric Oxide Synthase显示文摘 | Qingping Feng Wei Song Xiangru Lu Joel A. Hamilton Ming Lei Tianqing Peng Siu-Pok Yee | 2002 | Circulation: Journal of the American Heart Association2002，，7： | 1 |
| 9 | Isolation and identification of a potential biocontrol agent Bacillus subtilis QM3 from Qinghai yak dung in China显示文摘 | Hu Qingping Xu Jianguo Song Peng Song Jinning Chen Wuling | 2008 | World Journal of Microbiology and Biotechnology2008，24，11： | 1 |
| 10 | Role of microstructure in the thermomechanical behaviour of SMA composites 显示文摘 | Song Guquan Sun Qingping Cherkaoui M | 1999 | Transactions of the ASME1999，121，1： | 1 |
| 11 | Photo-induced fusion of monodisperse polymer microspheres:A novel strategy for constructing topological microsphere clusters with improved stability显示文摘The preparation of monodisperse azobenzene(Azo)polymer microspheres by dispersion polymerization was reported.The photo-induced fusion of Azo polymer microspheres was successfully achieved during the process of reversible trans-cistrans photoisomerization of Azo units,and induced various unique“microsphere molecular”clusters or“microsphere polymers”.Encouraged by this interesting phenomenon,microsphere clusters of different topological structures were stabilized by the in situ acetal cross-linking chemistry.The photo-induced fusion polymerization of monodisperse polymer microspheres provides a new strategy for designing photo-responsive clusters and allows for control over the mechanical properties of microspheres with high spatiotemporal resolution. | Zixiang He Su Shen Gong Zhang Tengfei Miao Xiaoxiao Cheng Zhao Wang Qingping Song Wei Zhang | 2023 | Aggregate2023，4，5： | 0 |
| 12 | A SURVEY OF THE THEORY OF WELL—BOUNDED OPERATORS显示文摘 | Cheng Qingping Song Shugang | 2001 | 荆州师范学院学报2001，24，5： | 0 |
| 13 | A Novel Edge Computing Based Area Navigation Scheme显示文摘The area navigation system,discussed in this paper,is composed of ground responders and a navigation terminal and can position a high-velocity aircraft and measure its velocity.This navigation system is silent at ordinary times.It sends out a request signal when positioning is required for an aircraft,and then the ground responders send a signal for resolving the aircraft.Combining the direct sequence spread spectrum and frequency hopping,the concealed communication mode is used in the whole communication process,with short communication pulses as much as possible,so the system has strong concealment and anti-interference characteristics.As the transmission delay is apparent in the response communication mode,there is a big error where the common navigation algorithm is used for the positioning and velocity measurement of a high-velocity aircraft.In this paper,a new algorithm is proposed,which can eliminate the influence of response communication delay on the positioning of a high-velocity moving target to realize the precise positioning and velocity measurement of a high-velocity aircraft. | Jianzhong Qi Qingping Song Jim Feng | 2020 | Computers, Materials & Continua2020，，12： | 0 |
| 14 | An improved model for predicting hydrate phase equilibrium in marine sediment environment显示文摘Based on the models of hydrate phase equilibrium in bulk water and porous media,an improved model was proposed to predict the methane hydrate equilibrium in marine sediment environment.In the suggested model,mechanical equilibrium of force between the interfaces in hydrate-liquid-vapor system was considered.When electrolyte was present in pore water,interfacial energy between hydrate and liquid was corrected by an equation that is expressed as the function of temperature and electrolyte concentration.The activity of water is calculated based on the Pitzer model and the interfacial energy between liquid and gas is solved using the Li method.The prediction results show good agreement with the experimental data.By comparison with other models,it is proved that this model can improve the accuracy for predicting hydrate phase equilibrium in marine sediment environment. | Yongchen Song Mingjun Yang Yongjun Chen Qingping Li | 2010 | Journal of Natural Gas Chemistry2010，19，3： | 0 |
| 15 | A large-scale experimental simulator for natural gas hydrate recovery and its experimental applications显示文摘To facilitate the recovery of natural gas hydrate(NGH)deposits in the South China Sea,we have designed and developed the world's largest publicly reported experimental simulator for NGH recovery.This system can also be used to perform CO_(2) capture and sequestration experiments and to simulate NGH recovery using CH_(4)/CO_(2) replacement.This system was used to prepare a shallow gas and hydrate reservoir,to simulate NGH recovery via depressurization with a horizontal well.A set of experimental procedures and data analysis methods were prepared for this system.By analyzing the measurements taken by each probe,we determined the temperature,pressure,and acoustic parameter trends that accompany NGH recovery.The results demonstrate that the temperature fields,pressure fields,acoustic characteristics,and electrical impedances of an NGH recovery experiment can be precisely monitored in real time using the aforementioned experimental system.Furthermore,fluid production rates can be calculated at a high level of precision.It was concluded that(1)the optimal production pressure differential ranges from 0.8 to 1.0 MPa,and the wellbore will clog if the pressure differential reaches 1.2 MPa;and(2)during NGH decomposition,strong heterogeneities will arise in the surrounding temperature and pressure fields,which will affect the shallow gas stratum. | Yang Ge Qingping Li Xin Lv Mingqiang Chen Bo Yang Benjian Song Jiafei Zhao Yongchen Song | 2023 | Petroleum2023，9，4： | 0 |
| 16 | A Carrier Synchronization Algorithm for AutonomousRadio Receiver in Deep Space显示文摘The carrier synchronization algorithm of the autonomous radio for deep space is studied.When the signal modulation is unknown,this paper improves the existing universal carrier synchronization loop for multiple modulations,expands the frequency tracking range of the loop,proposes a Tong detection-based M-ary Phase Shift Keying(M-PSK)signal locking detection algorithm to rapidly and effectively determine whether the current phase discrimination mode matches the modulation mode,so as to independently choose whether to switch the phase discrimination mode.Through theoretical analysis and comparison,it is described that the total detection probability of the algorithm proposed in this paper is significantly higher than the probability of single lock detection.Simulation results show that the algorithm has high detection probabiUty and low computational complexity at a low signal to noise ratio. | SONG Qingping LIU Rongke | 2015 | 空间科学学报2015，35，3： | 0 |
| 17 | 4D printing of core-shell hydrogel capsules for smart controlled drug release显示文摘Personalized drugs,as well as disease-specific and condition-dependent drug release,have been highly desired in drug delivery systems for effective and safe therapies.Four-dimensional(4 D)printing,as a newly emerging technique to develop drug capsules,displays unique advantages that can autonomously control drug release according to the actual physiological circumstances.Herein,core-shell structured hydrogel capsules were developed using a multimaterial extrusion-based 4 D printing method,which consists of a model drug as the core and UV cross-linked poly(N-isopropylacrylamide)(PNIPAM)hydrogel as the shell.Owing to the lower critical solution temperature(LCST)-induced shrinking/swelling properties,the prepared PNIPAM hydrogel capsules showed temperature-responsive drug release along with the topography changes in the cross-linked PNIPAM network.The in vitro drug release test confirmed that the PNIPAM hydrogel capsules can autonomously control their drug release behaviors according to changes in ambient temperature.Moreover,the increased shell thickness of these capsules causes an obvious reduction in drug release rate,distinctly indicating that the drug release behavior can be well adjusted by setting the shell thickness of the capsules.The proposed 4 D printing strategy pioneers the paradigm of smart drug release by showing great potential in the smart controlled release of drugs and macromolecular active agents. | Shuo Zu Zhihui Zhang Qingping Liu Zhenguo Wang Zhengyi Song Yunting Guo Yuanzhu Xin Shuang Zhang | 2022 | Bio-Design and Manufacturing2022，5，2： | 0 |
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