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| 1 | Approximate Maximum Likelihood Algorithm for Moving Source Localization Using TDOA and FDOA Measurements显示文摘A closed-form approximate maximum likelihood(AML) algorithm for estimating the position and velocity of a moving source is proposed by utilizing the time difference of arrival(TDOA) and frequency difference of arrival(FDOA) measurements of a signal received at a number of receivers.The maximum likelihood(ML) technique is a powerful tool to solve this problem.But a direct approach that uses the ML estimator to solve the localization problem is exhaustive search in the solution space,and it is very computationally expensive,and prohibits real-time processing.On the basis of ML function,a closed-form approximate solution to the ML equations can be obtained,which can allow real-time implementation as well as global convergence.Simulation results show that the proposed estimator achieves better performance than the two-step weighted least squares(WLS) approach,which makes it possible to attain the Cramér-Rao lower bound(CRLB) at a sufficiently high noise level before the threshold effect occurs. | YU Huagang HUANG Gaoming GAO Jun WU Xinhui | 2012 | Chinese Journal of Aeronautics2012，25，4： | 28 |
| 2 | Practical constrained least-square algorithm for moving source location using TDOA and FDOA measurements显示文摘By utilizing the time difference of arrival (TDOA) and frequency difference of arrival (FDOA) measurements of signals received at a number of receivers, a constrained least-square (CLS) algorithm for estimating the position and velocity of a moving source is proposed. By utilizing the Lagrange multipliers technique, the known relation between the intermediate variables and the source location coordinates could be exploited to constrain the solution. And without requiring apriori knowledge of TDOA and FDOA measurement noises, the proposed algorithm can satisfy the demand of practical applications. Additionally, on basis of convolute and polynomial rooting operations, the Lagrange multipliers can be obtained efficiently and robustly allowing real-time implementation and global convergence. Simulation results show that the proposed estimator achieves remarkably better performance than the two-step weighted least square (WLS) approach especially for higher measurement noise level. | Huagang Yu Gaoming Huang Jun Gao Bo Yan | 2012 | Journal of Systems Engineering and Electronics2012，23，4： | 20 |
| 3 | Invasion Possibility and Potential Effects of Rhus typhina on Beijing Municipality显示文摘Rhus typhina,an alien species introduced from North America,was identified as a main afforestation species in Beijing municipality. However,its invasiveness is still at odds. To clarify this problem,we applied the North American Screening System and the Australian Screening System to preliminarily predict its invasion possibility. Both screening systems gave the same recommendation to 'reject'. The geographical distribution was surveyed,with the population features of R. typhina against the native plant communities being assessed. With anthropogenic assistance,R. typhina has been scattered on almost all habitats from downtown to mountains,including roadsides,farmlands and protected areas. As a clonal shrub,R. typhina possessed a high spreading rate,varying from 6.3m/3years at sterile habitats to 6.7m/3years at fertile ones. Significantly lower species richness,individual density and diversity were observed in the R. typhina community than those of the native Vitex negundo Linn.var. heterophylla (Franch.) Rehd. community at both sterile and fertile habitats. Continual wide plantation of R. typhina may further foster its population expansion,which helps the species to overcome spatial isolation. The fact that each root fragment can develop into a new individual makes R. typhina very difficult to be eradicated once established. From a biological point of view,we believe that R. typhina is a plant invader in Beijing. We therefore suggest the government should remove the name of R. typhina from the main tree species list in afforesting Beijing. | Guangmei Wang Gaoming Jiang Shunli Yu Yinghao Li Hui Liu | 2008 | Journal of Integrative Plant Biology2008，50，5： | 5 |
| 4 | Two-dimensional LDH nanodisks modified with hyaluronidase enable enhanced tumor penetration and augmented chemotherapy显示文摘The condensed tumor extracellular matrix(ECM)consisting of cross-linked hyaluronic acid(HA)is one of the key factors that result in the aberrant tumor microenvironment and severely impair drug delivery and tumor penetration.Herein,we report a simple design of a hyaluronidase(HAase)-modified layered double hydroxide(LDH)nanoplatform loaded with anticancer drug doxorubicin(DOX)for enhanced tumor penetration and augmented chemotherapy.In our approach,LDH nanodisks were synthesized via a co-precipitation method,modified with HAase by electrostatic attraction,and finally physically loaded with DOX.The formulated DOX/LDH-HAase complexes show a high DOX loading percentage of 34.2%with good colloidal stability,retain 86.1%of the enzyme activity,and release DOX in a pH-responsive manner having a faster release rate under slightly acidic tumor microenvironment than that under a physiological condition.With the catalytic activity of HAase to digest the HA nearby the cancer cells,the developed DOX/LDH-HAase complexes enable more significant uptake by cancer cells and penetration in 3-dimensional tumor spheroids than enzyme-free DOX/LDH complexes,thus displaying much better antitumor efficacy in vitro than the latter.The more significant tumor penetration and inhibition of the DOX/LDH-HAase complexes than that of the DOX/LDH complexes was further demonstrated by in vivo tumor imaging and therapeutic activity assessments.Our study suggests a unique nanomedicine platform combined with both anticancer drug and enzyme for improved tumor penetration and chemotherapy,which is promising for effective chemotherapy of different types of stroma-rich tumors. | Gaoming Li Yu Fan Lizhou Lin Rong Wu Mingwu Shen Xiangyang Shi | 2021 | Science China Chemistry2021，64，5： | 2 |
| 5 | Photosynthesis,transpiration and water use efficiency of four plant species with grazing intensities in Hunshandak Sandland,China显示文摘 | Peng Yu Jiang Gaoming Liu Xuehua | 2007 | Journal of Arid Environments2007，70，： | 1 |
| 6 | Genetic analysis and ecological niche modeling delimit species boundary of the Przewalski’s scorpion(Scorpiones: Buthidae) in arid Asian inland显示文摘Reliable delimitation of venomous scorpions is not only consequential to toxicological studies but also instructive to conservation and exploration of these important medical resources.In the present study,we delimited species boundary for the the Przewalski’s scorpion from arid northwest China through a combined approach employing phylogenetic analysis,ecological niche modeling and morphological comparison.Our results indicate that the Przewalski’s scorpion represent an independent taxonomic unit and should be recognized as full species rank,Mesobuthus przewalskii stat.nov.This species and the Chinese scorpion M.martensii represent the eastern members of the M.caucasicus species group which manifests a trans-Central Asia distribution across the Tianshan Mountains range.We also discussed the likely geographic barrier and climatic boundary that demarcate distributional range of the the Przewalski’s scorpion. | Xueshu Zhang Gaoming Liu Yu Feng Dexing Zhang Chengmin Shi | 2020 | Zoological Systematics2020，45，2： | 1 |
| 7 | Traits of chlorophyll fluorescence in 99 plant species from the sparse-elm grassland in Hunshandak Sandland显示文摘 | Li Yonggeng Li Linghao Jiang Gaoming Niu Shuli Liu Meizhen Gao Leiming Peng Yu Jiang Chuangdao | 2004 | Photosynthetica2004，42，： | 1 |
| 8 | Effects of seasonal air temperature variation on airflow and surrounding rock temperature of mines显示文摘In underground mines, high air temperatures in the summer months lead to an increase in inlet airflow temperatures. This leads to seasonal thermal pollution in the mines. This paper examines the dynamics and effects of seasonal variation in surface air temperatures and surrounding rock temperatures in deep coal mines. It also examines temperature variations in the main ventilation circuit, working face, and surrounding rock. The study results revealed that airflow temperatures were significantly affected by seasonal air temperature variations. The greater the distance was between the inlet and the wellhead of the ventilation shaft, the less the effect was on temperature. Moreover, slight temperature variations (1.0-3.0 ℃) were observed between various points on the return route during the summer months. Airflow temperatures along the airflow inlet to the return route of the working face first decreased, but then increased. The temperature field of the surrounding rock increased gradually with increased distance between the mine roadway and inlet, with recorded rock temperatures as high as 40.53 ℃. The radius of the heat-adjusting layer was between 28 and 33 m. | Xin Yi Lifeng Ren Li Ma Gaoming Wei Wencong Yu Jun Deng Chimin Shu | 2019 | International Journal of Coal Science & Technology2019，6，3： | 1 |
| 9 | An efficient constrained weighted least squares algo- rithm for moving source location using TDOA and FDOA measurements显示文摘 | HUAGANG YU GAOMING HUANG JUN GAO | 2012 | IEEE transactions on wire- less communications2012，11，1： | 1 |
| 10 | Experimental Study and Numerical Simulation of Polymer Flooding显示文摘The numerical simulation of polymer flooding is a complex task as this process involves complex physical and chemical reactions,and multiple sets of characteristic parameters are required to properly set the simulation.At present,such characteristic parameters are mainly obtained by empirical methods,which typically result in relatively large errors.By analyzing experimentally polymer adsorption,permeability decline,inaccessible pore volume,viscosity-concentration relationship,and rheology,in this study,a conversion equation is provided to convert the experimental data into the parameters needed for the numerical simulation.Some examples are provided to demonstrate the reliability of the proposed approach. | Lei Bai Kai Li Ke Zhou Qingshan Wan Pengchao Sun Gaoming Yu Xiankang Xin | 2022 | Fluid Dynamics & Materials Processing2022，18，6： | 0 |
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