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612 results on '"Liu, Lidong"'

201. Antinoise and ECCM performances of Multi-Segment chaos-based FM radar signals

Author

He Zishu, Liu Lidong, Xie Shaobin, Wang Anan, and Xie Sheng

Subjects
Noise, Ambiguity function, law, Computer science, Radar imaging, Autocorrelation, Electronic engineering, Radar, Tent map, Signal, Frequency modulation, law.invention
Abstract

The aim of this paper present an analysis of a Multi-Segment chaos-based frequency modulated (MS CBFM) signals, to focus attention on antinoise and ECCM performances of MS-CBFM radar signals in a noise environment. Selected Logistic, Bernoulli, Tent and Multi-Segment as chaotic function generated CBFM signals. Lyapunov exponent, autocorrelation, power spectra and ambiguity function of selected CBFM signals were calculated, and antinoise performance of CBFM Signals were simulation in a noise environment. From the analysis and results of performance simulation presented in the thesis, it can be said that the use of MS CBFM radar signal, is not only feasible but also advantageous in the field of high-resolution radar imaging in a noise environment.

Published
2011
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202. Radar signal bandwidth-scaling via parameters of a changed Lorenz chaotic system

Author

Xie Sheng, Xie Shaobin, Liu Lidong, Hu Jinfeng, and Wang Anan

Subjects
Ambiguity function, law, Control theory, Radar imaging, Bandwidth (signal processing), Autocorrelation, Chaotic, Waveform, Radar, Scaling, Algorithm, Mathematics, law.invention
Abstract

This paper develops a changed Lorenz chaotic system (CLCS). We can scale the signal bandwidth exactly by scaling the parameters of the CLCS. The simulation results show that the new system also has nice radar characters such as its waveform has low peak-to-RMS ratio(PRMS), thumbtack shape ambiguity function, narrow main-lobe and low peak side-lobe autocorrelation function. When there is a strict requirement to the signal bandwidth, it doesn't need to spend much time in finding out other suitable parameters but just scaling the known suitable parameters. This is an advantage comparing to the signal waveform generated by the original Lorenz chaotic system.

Published
2011
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205. Simultaneous Activation of Short‐Wave Infrared (SWIR) Light and Paramagnetism by a Functionalized Shell for High Penetration and Spatial Resolution Theranostics.

Author

Ma, Liyi, Liu, Yuxin, Liu, Lidong, Jiang, Anqi, Mao, Fang, Liu, Dongdong, Wang, Lu, and Zhou, Jing

Subjects
NANOPARTICLES, MAGNETIC resonance imaging, NANOSTRUCTURED materials, PHOTOTHERMAL spectroscopy, TUMORS
Abstract

Abstract: Nanoparticle emitting short‐wave infrared (SWIR) light has received increased attention in the molecular imaging field due to its deeper tissue penetration, fast imaging, high sensitivity, and resolution. The simultaneously activated SWIR excited directly by an 808 nm laser and T1‐weighted magnetic resonance imaging (MRI) signal are found in one single‐shell nanoparticle NaErF4@NaGdF4 (Er@Gd), which is used as a dual‐modality imaging contrast agent in vivo to accurately determine the position of tumors. The conjugated cypate is then aggregated on the surface of Er@Gd@SiO2‐Cy/bovine serum albumin. With the guidance of dual modality imaging, photothermal therapy is effectively used to ablate tumors in a mouse model. The design of single‐shell nanomaterial activation of SWIR imaging and MRI signals is expected to provide a new strategy for high penetration and spatial resolution cancer theranostics. [ABSTRACT FROM AUTHOR]

Published
2018
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214. GW24-e3762 Role Of mitochondrial fission In cardiac microvascular endothelial cells after ischaemia/reperfusion

Author

Wang Hai-chang, Yu Qiujun, and Liu Lidong

Subjects
FIS1, chemistry.chemical_classification, Mitochondrial ROS, Reactive oxygen species, Pathology, medicine.medical_specialty, business.industry, Mitochondrion, medicine.disease, Molecular biology, chemistry, Apoptosis, Medicine, Mitochondrial fission, Viability assay, Cardiology and Cardiovascular Medicine, business, Reperfusion injury
Abstract

Objectives This study is aimed to establish a simulated ischaemia/reperfusion (SI/R) model in cultured CMECs from adult rat, and investigate the role of mitochondrial fission in CMECs I/R injury and the underlying mechanisms. Methods CMECs were isolated from adult rat ventricles and exposed to simulated ischaemia/reperfusion (SI/R). CMECs were randomly divided into four groups: control group, SI/R group, SI/R + Mdivi-1 (a mitochondrial fission inhibitor) group and SI/R + NAC (an reactive oxygen species scavenger) group; Cell viability was measured with MTT assay; Migration ability was detected by the Transwell method; Flow cytometry based on AnnexinV-FITC/PI double staining and TUNEL staining were used to detect apoptoticrates; Mitochondrial morphology of CMECs was observed by fluorescence microscope following Mito-Tracker Green staining; Protein levels of Drp1 and Fis1 were analysed by Western blot; Intracellular ROS levels were tested by a reactive oxygen species assay kit; Mitochondria ROS level was measured using mitochondria superoxide marker Mitosox; Mitochondrial membrance potential was detected by a mitochondrial membrance potential assay kit (JC-1 staining). Results Compared with control group, both cell viability and migration ability in the SI/R group were impaired, and apoptosis index was significantly increased. Mitochondrial fission was also enhanced following SI/R, as evidenced by increased mitochondrial fragments using fluorescence microscope. Cells in the SI/Rgroup exhibited significantly higher expression of Drp1 and Fisl protein than that in the control group. Compared with SI/R group, both cell viability and migration ability in theSI/R + Mdivi-1 group were increased, with apoptosis index decreased by Mdivi-1 administered before reperfusion. Besides, mitochondrial fission was significantly confined. However, Drp1 and Fisl protein level showed no significant changes,and both cellular and mitochondrial ROS levels decreased remarkablely, along with increased mitochondrial membrance potential. Antioxidant NAC reversed the SI/R-induced increase in both cellular and mitochondrial ROS levels, and further inhibited the SI/R-stimulated mitochondrial fission. Conclusions Increased mitochondrial fission play an important role inCMECs ischaemia/ reperfusion injury. Underlying mechanisms involves its interaction with cellular and mitochondrial ROS generation and the maintenance of mitochondrial membrance potential. Thus inhibiting mitochondrial fission mayrepresent a new promising strategy in protecting CMECs from I/R injury, hence the salvage of I/R heart.

Published
2013
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215. Inter valley phonon scattering mechanism in strained Si/(101)Si1−xGex

Author

Liu Lidong, Guo Chen, Qiao Liping, Wang Jiang'an, Liu Ce, and Jin Zhao

Subjects
Electron mobility, Materials science, Phonon scattering, Condensed matter physics, Phonon, Scattering, Electron, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Stress (mechanics), Condensed Matter::Materials Science, symbols.namesake, Boltzmann constant, Materials Chemistry, symbols, Electrical and Electronic Engineering, Nanoscopic scale
Abstract

Inter valley scattering has a great impact on carrier mobility of strained Si materials, so based on Fermi's golden rule and the theory of Boltzmann collision term approximation, inter valley phonon scattering mechanism of electrons in nano scale strained Si (101) materials is established under the influence of both energy and stress. It shows that inter valley phonon f2, f3, g3 scattering rates decrease markedly in nano scale strained Si (101) materials with increasing stress. The quantized models can provide valuable references to the understanding of strained Si materials and the research on electron carrier mobility.

Published
2013
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238. Study on fast synchronization of chaos

Author

He Zishu, Hu Jinfeng, Zheng Hao-Zhou, and Liu Lidong

Subjects
State variable, Nonlinear system, Rate of convergence, Computer science, Control theory, Synchronization of chaos, Synchronization (computer science), General Physics and Astronomy, Self-clocking signal, Clock synchronization
Abstract

In radar, communication and other engineering applications, fast synchronization is needed because of the limited time of transmitting signal. However, the convergence rate of conventional synchronization is slow. To resolve the problem, a fast synchronization algorithm is proposed. According to Taylor expansion, nonlinear controller is designed to make the control matrix of error equation satisfy critical conditions for synchronization and further to optimize the control matrix, so fast synchronization can be achieved with only one step operation. In addition, given the practical engineering launches only one state variable, in this paper are take the typical continuous Duffing system and discrete Logistic system as examples and design the fast synchronization driven by only one variable. Finally, simulation results show that compared with common single coupling and OPCL synchronization, the proposed algorithm has fast convergence rate, strong anti-noise cap ability, and strong engineering practice significance.

Published
2011
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242. Erratum

Author

Man, Heng-Ye, Lin, Jerry W., Ju, William H., Ahmadian, Gholamreza, Liu, Lidong, Becker, Laurence E., Sheng, Morgan, and Wang, Yu Tian

Subjects
Neuroscience(all), General Neuroscience
Published
2001
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244. Hippocampal long-term depression mediates acute stress-induced spatial memory retrieval impairment

Author

Wong, Tak Pan, primary, Howland, John G., additional, Robillard, Julie M., additional, Ge, Yuan, additional, Yu, Wayne, additional, Titterness, Andrea K., additional, Brebner, Karen, additional, Liu, Lidong, additional, Weinberg, Joanne, additional, Christie, Brian R., additional, Phillips, Anthony G., additional, and Wang, Yu Tian, additional

Published
2007
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245. NMDA Receptor Function and NMDA Receptor-Dependent Phosphorylation of Huntingtin Is Altered by the Endocytic Protein HIP1

Author

Metzler, Martina, primary, Gan, Lu, additional, Pan Wong, Tak, additional, Liu, Lidong, additional, Helm, Jeffrey, additional, Liu, Lili, additional, Georgiou, John, additional, Wang, Yushan, additional, Bissada, Nagat, additional, Cheng, Kevin, additional, Roder, John C., additional, Wang, Yu Tian, additional, and Hayden, Michael R., additional

Published
2007
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246. Intrinsic carrier concentration as a function of stress in (001), (101) and (111) biaxially-Strained-Si and Strained-SiGe.

Author

Jin, Zhao, Qiao, Liping, Liu, Lidong, He, Zhili, Guo, Chen, and Liu, Ce

Abstract

Intrinsic carrier concentration ( n) is one of the most important physical parameters for understanding the physics of strained Si and SiGe materials as well as for evaluating the electrical properties of Si-based strained devices. Up to now, the report on quantitative results of intrinsic carrier concentration in strained Si and SiGe materials has been still lacking. In this paper, by analyzing the band structure of strained Si and SiGe materials, both the effective densities of the state near the top of valence band and the bottom of conduction band ( N and N) at 218, 330 and 393 K and the intrinsic carrier concentration related to Ge fraction ( x) at 300 K were systematically studied within the framework of KP theory and semiconductor physics. It is found that the intrinsic carrier concentration in strained Si (001) and SiGe (001) and (101) materials at 300 K increases significantly with increasing Ge fraction ( x), which provides valuable references to understand the Si-based strained device physics and design. [ABSTRACT FROM AUTHOR]

Published
2015
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