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| 1 | Underdetermined Blind Source Separation of Adjacent Satellite Interference Based on Sparseness显示文摘The problem of underdetermined blind source separation of adjacent satellite interference is proposed in this paper. Density Clustering algorithm(DC-algorithm) presented in this article is different from traditional methods. Sparseness representation has been applied in underdetermined blind signal source separation. However, some difficulties have not been considered, such as the number of sources is unknown or the mixed matrix is ill-conditioned. In order to find out the number of the mixed signals, Short Time Fourier Transform(STFT) is employed to segment received mixtures. Then, we formulate the blind source signal as cluster problem. Furthermore, we construct Cost Function Pair and Decision Coordinate System by using density clustering. At the end of this paper, we discuss the performance of the proposed method and verify the novel method based on several simulations. We verify the proposed method on numerical experiments with real signal transmission, which demonstrates the validity of the proposed method. | Chengjie Li Lidong Zhu Zhongqiang Luo | 2017 | China Communications2017，14，4： | 10 |
| 2 | Early Uplift History of the Tibetan Plateau:Records from Paleocurrents and Paleodrainage in the Hoh Xil Basin显示文摘摘要:在领域工作收集的 Paleocurrent 指示物数据被用来在北西藏的高原在 Hoh Xil 盆学习早新生代地区性的 paleodrainage 模式。paleocurrent 方向始新世 Fenghuoshan 组显然证明流动是向北方与一个单向性的疏开模式。这可能在起始的盆免职时期期间反映 Qiangtang 地面的 uplift 并且显示 Tanggula Moutains 在至少作为地志的高地发生了始新世。渐新世 Yaxicuo 组的 Paleoflows 对北方主导地面向然后在它的迟了的免职期间向东流动了。Yaxicuo 组的 paleodrainage 模式的这地区性的可变性被解释从横向的河记录沉积的疏开风格到纵的河系统。渐新世山妨碍了由的 Kunlun 高举,这被推断向北方,到 orogenic 的 paleoflows 和创造的纵的河系统平行系上带子。paleodrainage 模式的时间、空间的变化建议西藏的高原的北边界在早新生代期间位于 Hoh Xil 区域,它的 uplift 整个时间向北进行了。 | YI Haisheng WANG Chengshan SHI Zhiqiang LIN Jinhui ZHU Lidong | 2008 | Acta Geologica Sinica(English Edition)2008，82，1： | 7 |
| 3 | The Spread Spectrum GFDM Schemes for Integrated Satellite-Terrestrial Communication System显示文摘Recently, integrated Satellite-Terrestrial(S-T) communication system, especially the integration of satellite communication with 5G/6G, is regarded as a research hotpot. Future integrated S-T communication systems are demanding a more compatible and robust physical layer waveform. Considering physical layer access waveform design, this paper proposed a novel Spread Spectrum Generalized Frequency Division Multiplexing(SS-GFDM) scheme for integrated S-T communication system. Traditional GFDM has many advantages such as excellent adaptability and low out-ofband(OOB) radiation. However, because of intrinsic inter carrier interference(ICI) and low signal-to-noise ratio(SNR), the multiple access performance is degraded. In this paper, we introduced CDMA technology into GFDM. Two different spread spectrum modes, Cyclic Code Shift Keying(CCSK) soft spread spectrum and Direct Sequence Spread Spectrum(DSSS), are considered and compared in this paper to illustrate the benefits of GFDM-CDMA in low SNR scenario. Moreover, this scheme integrates the slot-ALOHA protocol with GFDM-CDMA, which extends access freedom in frequency, time and code domain. The simulation and analysis results show that the proposed GFDM-CDMA scheme reduces the performance degradation caused by interference. It is effective in typical satellite channel with low complexity. Meanwhile, the peak-average-power-ratio(PAPR) and access performance has been enhanced significantly. | Yang Yang Lidong Zhu Xing Mao Qi Tan Zongmiao He | 2019 | China Communications2019，16，12： | 4 |
| 4 | Loss of gonadal soma derived factor damaging the pituitary-gonadal axis in medaka显示文摘Medaka sex is determined by dmy/dmrt1b Y,the doublesex and mab-3 domain gene on the Y chromosome[1,2].Most recent studies have revealed a germ cell-intrinsic cue for the sperm-egg fate decision present in medaka,leading to spermatogenesis occurrence in a female gonadal environment without the presence of dmy[3].Targeted disruption of dmy,or sex related genes,such | Kaiqing Sun Lidong Fan Chuanyun Wang Xiaoyu Yang Shuangguang Zhu Xi Zhang Xiaowu Chen Yunhan Hong Guijun Guan | 2017 | Science Bulletin2017，62，3： | 4 |
| 5 | Independent Component Analysis Based Blind Adaptive Interference Reduction and Symbol Recovery for OFDM Systems显示文摘To overcome the inter-carrier interference(ICI) of orthogonal frequency division multiplexing(OFDM) systems subject to unknown carrier frequency offset(CFO) and multipath, this paper develops a blind adaptive interference suppression scheme based on independent component analysis(ICA). Taking into account statistical independence of subcarriers' signals of OFDM, the signal recovery mechanism is investigated to achieve the goal of blind equalization. The received OFDM signals can be considered as the mixed observation signals. The effect of CFO and multipath corresponds to the mixing matrix in the problem of blind source separation(BSS) framework. In this paper, the ICAbased OFDM system model is built, and the proposed ICA-based detector is exploited to extract source signals from the observation of a received mixture based on the assumption of statistical independence between the sources. The blind separation technique can increase spectral efficiency and provide robustness performance against erroneous parameter estimation problem. Theoretical analysis and simulation results show that compared with the conventional pilot-based scheme, the improved performance of OFDM systems is obtained by the proposed ICA-based detection | LUO Zhongqiang ZHU Lidong LI Chengjie | 2016 | China Communications2016，13，2： | 3 |
| 6 | Non-Orthogonal Multi-Carrier Transmission for Internet via Satellite显示文摘As the important complementary to terrestrial mobile communications, Internet via satellite can extend the coverage of communication and improve the continuity of data services. To build a space-terrestrial integrated communication system is the inevitable trend in the future. Taking into account combination of 5th generation(5G) terrestrial mobile communication system and satellite communication system, it is necessary to evaluate the promising 5G air interface waveform which can be adopted by satellite. In this paper, several non-orthogonal multi-carrier transmission schemes are evaluated and generalized frequency division multiplexing(GFDM) is advised as potential scheme of space-terrestrial integrated communication system. After the overview of GFDM, the implementation of GFDM transceiver is discussed respectively in time-domain and in frequency-domain. By deriving and comparing implementation complexity, GFDM modulation in time-domain is more suitable for satellite communication system. Then the properties of demodulation algorithms are specified. Based on designed pilot subcarriers, a new improved receiving algorithm is proposed in the end of the paper. The improved algorithm solves the problem of inter subcarriers interference(ICI) in matched filtering(MF) receiver and improves the re-ceiving symbol error rate(SER) obviously. The simulation and analysis prove that the proposed algorithm is effective. | Yang Yang Lidong Zhu | 2017 | China Communications2017，14，3： | 3 |
| 7 | Crystalline Structure-Dependent Mechanical and Thermoelectric Performance in Ag_(2)Se_(1‐x)S_(x)System显示文摘Self-powered wearable electronics require thermoelectric materials simultaneously with a high dimensionless figure of merit(zT)and good flexibility to convert the heat discharged by the human body into electricity.Ag_(2)(S,Se)-based semiconducting materials can well satisfy these requirements,and thus,they are attracting great attention in thermoelectric society recently.Ag_(2)(S,Se)crystalizes in an orthorhombic structure or monoclinic structure,depending on the detailed S/Se atomic ratio,but the relationship between its crystalline structure and mechanical/thermoelectric performance is still unclear to date.In this study,a series of Ag_(2)Se_(1-x)S_(x)(x=0,0.1,0.2,0.3,0.4,and 0.45)samples were prepared and their mechanical and thermoelectric performance dependence on the crystalline structure was systematically investigated.x=0:3 in the Ag_(2)Se_(1-x)S_(x)system was found to be the transition boundary between orthorhombic and monoclinic structures.Mechanical property measurement shows that the orthorhombic Ag_(2)Se_(1-x)S_(x)samples are brittle while the monoclinic Ag_(2)Se_(1-x)S_(x)samples are ductile and flexible.In addition,the orthorhombic Ag_(2)Se_(1-x)S_(x)samples show better electrical transport performance and higher zT than the monoclinic samples under a comparable carrier concentration,most likely due to their weaker electron-phonon interactions.This study sheds light on the further development of flexible inorganic TE materials. | Jiasheng Liang Pengfei Qiu Yuan Zhu Hui Huang Zhiqiang Gao Zhen Zhang Xun Shi Lidong Chen | 2020 | Research2020，，1： | 2 |
| 8 | Late Triassic bivalves associated with a hydrothermal vent system in the Yidun Island Arc (SW China) of the eastern Tethys显示文摘The Yidun Island Arc in the Three Rivers (Jinsha River, Lancang River, Nujiang River) region of southwestern China is one of the most important Kuroko-type volcanogenic massive sulfide deposits (VMS) in China. Intra-arc rifting of Yidun Island occurred during the Late Carnian-Norian when VMS deposits such as the Gacun Pb-Zn-Cu deposit were formed. A bivalve fauna was found in fine-grained tuffaceous slate and in mineralized tuffaceous siltstone containing very high contents of Pb (45.01-103.37 ppm) and Zn (135.78-300.03 ppm) of the upper Tumugou Formation in the Changtai-Gacun volcanic-sedimentary rift basin. Stratigraphically, the bivalve-bearing beds are equivalents of the Gacun Pb-Zn-Cu deposits. The diversity of this bivalve fauna is very low. It consists mainly of the thin-shelled, epibyssate suspension-feeding bivalves Pergamidia eumenea and Parapergamidia changtaiensis, the burrowing large, elongated, suspension-feeding Trigonodus keuperinus and Unionites? sp., and occasional specimens of the endobyssate suspension-feeding Trigonodus? sp. and the deep burrowing suspension-feeding Pleuromya markiamensis. Individuals of the first four taxa are so abundant that the specimens are sometimes concentrated in shell beds, probably indicating a gregarious habit. This bivalve fauna is associated with internal moulds of cylindrical, slightly conical tubes most likely produced by a worm-shaped organism. Composition, morphology, diversity, and high abundance of this fauna, chemical features of the surrounding sediment, and the tectonic setting all suggest that this bivalve fauna lived in a deep-water environment in or around a hydrothermal vent system. | LIN Li ZHU LiDong PANG YanChun SHA JinGeng Franz T. FURSICH FU XiuGen WANG XinLi | 2011 | Science China Earth Sciences2011，54，12： | 2 |
| 9 | Experimental study on vibration suppression in a rotor system under base excitation using an integral squeeze film damper显示文摘Base excitation is one of common excitations in rotor system.In order to study the dynamic characteristics of rotor systems under base excitation and the effect of integral squeeze film dampers(ISFDs)on their dynamic characteristics,a single-disk rotor test rig,where mass imbalance and base excitation could be applied,is developed.Experimental research on the rotor system response under sinusoidal base excitation conditions with different frequencies and excitation forces is performed and the effect of ISFD on the dynamic characteristics of the rotor is investigated.The experimental results demonstrate that when the sinusoidal base excitation frequency approaches the first critical speed of the rotor system or the natural frequency of the rotor system base,strong vibration occurs in the rotor,indicating that the base excitation of the two frequencies has a greater impact on rotor system response.In addition,with the increase of the base excitation force,the vibration of the rotor will be increased.ISFDs can significantly inhibit the vibration due to unbalanced forces and sinusoidal base excitation in rotor systems.To a certain extent,ISFDs can improve the effect of sinusoidal base excitation with most frequencies on rotor system response,and they have a good vibration reduction effect for sinusoidal base excitation with different excitation forces. | 闫伟 He Lidong Zhu Gang Wang Shengli Deng Zhe | 2020 | High Technology Letters2020，26，4： | 2 |
| 10 | Risk of tuberculosis in patients with rheumatoid arthritis treated with biological and targeted drugs:meta-analysis of randomized clinical trials显示文摘Background:Concerns exist regarding the potential development of tuberculosis in patients with rheumatoid arthritis(RA)treated with biological and targeted drugs.We assessed systematically whether biological therapy increased the risk of tuberculosis in patients with RA by meta-analysis of randomized controlled trials(RCTs).Methods:A systematic literature search was conducted in PubMed,Embase,the Cochrane Library,and China Biology Medicine disc for RCTs evaluating biological therapy in patients with RA from inception through August 2021.Traditional meta-analysis and network meta-analysis were performed to compare the risk of tuberculosis for each biologics class in patients with RA.Peto odds ratio(Peto OR)and its 95%confidence interval(CI)were calculated as the primary effect measure.Results:In total,39 studies with 20,354 patients were included in this meta-analysis,and 82 patients developed tuberculosis.The risk of tuberculosis was increased in patients treated with biologics compared with non-biologics(Peto OR:3.86,95%CI:2.36-6.32,P<0.001).Also,tumor necrosis factor-α(TNF-α)inhibitors had a higher probability of developing tuberculosis than placebo(Peto OR:3.98,95%CI:2.30-6.88,P<0.001).However,network meta-analysis demonstrated that there was no significant difference in the risk of tuberculosis for each biologics class in patients with RA.Noticeably,tuberculosis was significantly more common in patients treated with a high dose compared with patients receiving a low dose of tofacitinib(Peto OR:7.39,95%CI:2.00-27.31,P=0.003).Conclusion:This meta-analysis demonstrates the evidence of an elevated risk of tuberculosis in patients with RA treated with TNF-αinhibitors,and a dose-dependent elevated risk of tuberculosis in patients treated with tofacitinib. | Xiaojian Ji Lidong Hu Yiwen Wang Siliang Man Xingkang Liu Chuan Song Jiaxin Zhang Jian Zhu Jianglin Zhang Feng Huang | 2022 | Chinese Medical Journal2022，，4： | 2 |
| 11 | Molecular evidence fornitrite-dependent anaerobic methane-oxidising bacteria in theJiaojiang Estuary of the East Sea ( China ) 显示文摘 | SHEN Lidong ZHU Qun LIU Shuai | 2014 | AppliedMicrobiology and Biotechnology2014，98，50： | 1 |
| 12 | The S190R mutation in the hemagglutinin protein of pandemic H1N1 2009 influenza virus increased its pathogenicity in mice显示文摘Human influenza viruses preferentially bind to sialic acid-α2,6-galactose (SAα2,6Gal) receptors, which are predominant in human upper respiratory epithelia, whereas avian influenza viruses preferentially bind to SAα2,3Gal receptors. However, variants with amino acid substitutions around the receptor-binding sites of the hemagglutinin (HA) protein can be selected after several passages of human influenza viruses from patients’ respiratory samples in the allantoic cavities of embryonated chicken eggs. In this study, we detected an egg-adapted HA S190R mutation in the pandemic H1N1 virus 2009 (pdmH1N1), and evaluated the effects of this mutation on receptor binding affinity and pathogenicity in mice. Our results revealed that residue 190 is located within the pocket structure of the receptor binding site. The single mutation to arginine at position 190 slightly increased the binding affinity of the virus to the avian receptor and decreased its binding to the long human α2,6-linked sialic acid receptor. Our study demonstrated that the S190R mutation resulted in earlier death and higher weight loss in mice compared with the wild-type virus. Higher viral titers at 1 dpi (days post infection) and diffuse damage at 4 dpi were observed in the lung tissues of mice infected with the mutant virus. | Yongkun Chen Tian Bai Wenfei Zhu Rongbao Gao Zhihong Deng Yi Shi Shumei Zou Yiwei Huang Xiyan Li Fangcai Li Zhaomin Feng Tao Chen Jing Yang Dayan Wang Lidong Gao Yuelong Shu | 2018 | Science China(Life Sciences)2018，61，7： | 1 |
| 13 | Effective Methods and Performance Analysis on Data Transmission Security with Blind Source Separation in Space-Based AIS显示文摘In space-based Automatic Identification Systems(AIS), due to high satellite orbits, several Ad Hoc cells within the observation range of the satellite are vulnerable to interference by an external signal.To increase efficiency in target detection and improve system security, a blind source separation method is adopted for processing the conflicting signals received by satellites. Compared to traditional methods, we formulate the separation problem as a clustering problem. Since our algorithm is affected by the sparseness of source signals, to get satisfactory results, our algorithm assumes that the distance between two arbitrary mixed-signal vectors is less than the doubled sum of variances of distribution of the corresponding mixtures. Signal sparsity is overcome by computing the Short-Time Fourier Transform, and the mixed source signals are separated using the improved PSO clustering. We evaluated the performance and the robustness of the proposed network architecture by several simulations. The experimental results demonstrate the effectiveness of the proposed method in not only improving satellite signal receiving ability but also in enhancing space-based AIS security. | Chengjie Li Lidong Zhu Zhongqiang Luo Zhen Zhang Ying Yang | 2022 | China Communications2022，19，4： | 1 |
| 14 | SmartPrint : A cloud print system for office 显示文摘 | Zhu Yuqing Wu Weili Wu Lidong | 2013 | Proceedings-IEEE 9th In- ternational Conference on Mobile Ad-Hoc and Sensor Net- works2013，2013，： | 1 |
| 15 | Cenozoic Vertical-Axis Rotations of the Hoh Xil Basin, Central–Northern Tibet显示文摘Understanding the Cenozoic vertical-axis rotation in the Tibetan Plateau is crucial for continental dynamic evolution. Paleomagnetic and rock magnetic investigations were carried out for the Oligocene and Miocene continental rocks of the Hoh Xil basin in order to better understand the tectonic rotations of central Tibet. The study area was located in the Tongtianhe area located in the southern part of the Hoh Xil basin and northern margin of the Tanggula thrust system in central-northern Tibet. A total of 160 independently oriented paleomagnetic samples were drilled from the Tongtianhe section for this study. The magnetic properties of magnetite and hematite have been recognized by measurements of magnetic susceptibility vs. temperature curves and unblocking temperatures. The mean directions of the Oligocene Yaxicuo Group in stratigraphic coordinates(Declination/Inclination = 354.9°/29.3°, k = 33.0, α_(95) = 13.5°, N =5 Sites) and of the Miocene Wudaoliang Group in stratigraphic coordinates(Declination/Inclination = 3.6°/36.4°, k = 161.0, α_(95) = 9.7°, N =3 Sites) pass reversal tests, indicating the primary nature of the characteristic magnetizations. Our results suggested that the sampled areas in the Tuotuohe depression of the Hoh Xil basin have undergone no paleomagnetically detectable rotations under single thrusting from the Tanggula thrust system. Our findings, together with constraints from other tectonic characteristics reported by previous paleomagnetic studies, suggest tectonic rotations in the Cuoredejia and Wudaoliang depressions of the Hoh Xil basin were affected by strike-slip faulting of the Fenghuo Shan-Nangqian thrust systems. A closer examination of geological data and different vertical-axis rotation magnitudes suggest the tectonic history of the Hoh Xil basin may be controlled by thrust and strike-slip faulting since the Eocene. | RAN Bo ZHAO Xixi LIU Zhifei WANG Chengshan ZHU Lidong JIN Wei LI Yalin | 2016 | Acta Geologica Sinica(English Edition)2016，90，3： | 1 |
| 16 | Robust Blind Separation for MIMO Systems against Channel Mismatch Using Second-Order Cone Programming显示文摘To improve the deteriorated capacity gain and source recovery performance due to channel mismatch problem,this paper reports a research about blind separation method against channel mismatch in multiple-input multiple-output(MIMO) systems.The channel mismatch problem can be described as a channel with bounded fluctuant errors due to channel distortion or channel estimation errors.The problem of blind signal separation/extraction with channel mismatch is formulated as a cost function of blind source separation(BSS) subject to the second-order cone constraint,which can be called as second-order cone programing optimization problem.Then the resulting cost function is solved by approximate negentropy maximization using quasi-Newton iterative methods for blind separation/extraction source signals.Theoretical analysis demonstrates that the proposed algorithm has low computational complexity and improved performance advantages.Simulation results verify that the capacity gain and bit error rate(BER) performance of the proposed blind separation method is superior to those of the existing methods in MIMO systems with channel mismatch problem. | Zhongqiang Luo Chengjie Li Lidong Zhu | 2017 | China Communications2017，14，6： | 1 |
| 17 | Constraints on the early uplift history of the Tibetan Plateau显示文摘 | Wang Chengshan Zhao Xixi Liu Zhifei Lippert P C Graham S A Coe R S Yi Haisheng Zhu Lidong Liu Shun Li Yalin | 2008 | PNAS2008，105，13： | 1 |
| 18 | Quaternary sediment in the Yichang area:Implications for the formation of the Three Gorges of the Yangtze River显示文摘 | Xiang Fang Zhu Lidong Wang Chengshan | 2007 | Geomorphology2007，85，： | 1 |
| 19 | Intelligent Blind Source Separation Technology Based on OTFS Modulation for LEO Satellite Communication显示文摘In LEO(Low Earth Orbit)satellite communication system,the orbit height of the satellite is low,the transmission delay is short,the path loss is small,and the frequency multiplexing is more effective.However,it is an unavoidable technical problem of the significant Doppler effect caused by the interference between satellite networks and the high-speed movement of the satellite relative to the ground.In order to improve the target detection efficiency and system security of LEO satellite communication system,blind separation technology is an effective method to process the collision signals received by satellites.Because of the signal has good sparsity in Delay-Doppler domain,in order to improve the blind separation performance of LEO satellite communication system,orthogonal Time-Frequency space(OTFS)modulation is used to convert the sampled signal to Delay-Doppler domain.DBSCAN clustering algorithm is used to classify the sparse signal,so as to separate the original mixed signal.Finally,the simulation results show that the method has a good separation effect,and can significantly improve the detection efficiency of system targets and the security of LEO satellite communication system network. | Chengjie Li Lidong Zhu Cheng Guo Tao Liu Zhen Zhang | 2022 | China Communications2022，19，7： | 1 |
| 20 | Deep Unfolding for Cooperative Rate Splitting Multiple Access in Hybrid Satellite Terrestrial Networks显示文摘Rate splitting multiple access(RSMA)has shown great potentials for the next generation communication systems.In this work,we consider a two-user system in hybrid satellite terrestrial network(HSTN)where one of them is heavily shadowed and the other uses cooperative RSMA to improve the transmission quality.The non-convex weighted sum rate(WSR)problem formulated based on this model is usually optimized by computational burdened weighted minimum mean square error(WMMSE)algorithm.We propose to apply deep unfolding to solve the optimization problem,which maps WMMSE iterations into a layer-wise network and could achieve better performance within limited iterations.We also incorporate momentum accelerated projection gradient descent(PGD)algorithm to circumvent the complicated operations in WMMSE that are not amenable for unfolding and mapping.The momentum and step size in deep unfolding network are selected as trainable parameters for training.As shown in the simulation results,deep unfolding scheme has WSR and convergence speed advantages over original WMMSE algorithm. | Qingmiao Zhang Lidong Zhu Shan Jiang Xiaogang Tang | 2022 | China Communications2022，19，7： | 1 |
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