41 results on '"Shi Lin Liu"'
Search Results
2. Small Object Detection Based on Two-Stage Calculation Transformer
- Author
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XU Shoukun, GU Jianan, ZHUANG Lihua, LI Ning, SHI Lin, LIU Yi
- Subjects
yolox ,transformer ,small object detection ,feature fusion and refinement ,Electronic computers. Computer science ,QA75.5-76.95 - Abstract
Despite the current small object detection task has achieved significant improvements, it still suffers from some problems. For example, it is a challenge to extract small object features because of little information in the scene of small objects, which may lose the original feature information of small object, resulting in poor detection results. To address this problem, this paper proposes a two-stage calculation Transformer (TCT) based small object detection network. Firstly, a two-stage calculation Transformer is embedded in the backbone feature extraction network for feature enhancement. Based on the traditional Transformer values computation, multiple 1D dilated convolutional layer branches with different feature fusions are utilized to implement global self-attention for the purpose of improving the feature representation and information interaction. Secondly, this paper proposes an effective residual connection module to improve the low-efficiency convolution and activation of the current CSPLayer, which helps to advance the information flow and learn more rich contextual details. Finally, this paper proposes a feature fusion and refinement module for fusing multi-scale features and improving the target feature representation capability. Quantitative and qualitative experiments on PASCAL VOC2007+2012 dataset, COCO2017 dataset and TinyPerson dataset show that the proposed algorithm has better ability of target feature extraction and higher detection accuracy for small target detection, compared with YOLOX.
- Published
- 2023
- Full Text
- View/download PDF
3. Deep Implicit Moving Least-Squares Functions for 3D Reconstruction.
- Author
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Shi-Lin Liu, Hao-Xiang Guo, Hao Pan 0001, Peng-Shuai Wang, Xin Tong 0001, and Yang Liu 0014
- Published
- 2021
- Full Text
- View/download PDF
4. A broadband bifocal conformal transmitarray antenna with wide scanning angles
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Yu Lu Fan, Xian Qi Lin, and Shi Lin Liu
- Subjects
Electrical and Electronic Engineering ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2022
5. Rolling guidance normal filter for geometric processing.
- Author
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Peng-Shuai Wang, Xiao-Ming Fu 0001, Yang Liu 0014, Xin Tong 0001, Shi-Lin Liu, and Baining Guo
- Published
- 2015
- Full Text
- View/download PDF
6. Sonocatalytic removal of tetracycline in the presence of S-scheme Cu2O/BiFeO3 heterojunction: Operating parameters, mechanisms, degradation pathways and toxicological evaluation
- Author
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Xin Wang, Xue-Song He, Chun-Yu Li, Shi-Lin Liu, Wen Lu, Zheng Xiang, and Yang Wang
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Process Chemistry and Technology ,Safety, Risk, Reliability and Quality ,Waste Management and Disposal ,Biotechnology - Published
- 2023
7. [Prognostic Factors Analysis of Children with Hemophagocytic Lymphohistiocytosis]
- Author
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Qin, Li, Yun-Sheng, Chen, Shi-Lin, Liu, Si-Xi, Liu, Xi-Min, Fang, Wei-Guo, Yang, Yue-Jie, Zheng, Wen-Jian, Wang, Ji-Kui, Deng, Jun, Yang, Fei-Qiu, Wen, and Hui-Rong, Mai
- Subjects
Survival Rate ,Adolescent ,Risk Factors ,Child, Preschool ,Humans ,Infant ,Child ,Prognosis ,Lymphohistiocytosis, Hemophagocytic ,Retrospective Studies - Abstract
To analyze the risk factors affecting prognosis of children with hemophagocytic lymphohistiocytosis (HLH).The clinical manifestations and laboratory data of 143 HLH children who met the HLH-2004 diagnostic criteria in Shenzhen Children's Hospital from January 2009 to May 2017 were retrospectively analyzed, and the independent factors affecting prognosis were also analyzed.The median age of 143 HLH children was 1.9 (0.1-14.3) years old, and the median follow-up time was 6.7 years (1 day - 11.9 years). The overall survival rate of 1 month, 1 year, and 10 years was (87.4±5.5)%, (81.1±6.5)%, and (81.1±6.5)%, respectively. The deaths occurred within 1 year after onset. Multivariate analysis showed that central nervous system (CNS) involvement (P=0.047), low hemoglobin (P=0.002), prolonged activated partial thromboplastin time (APTT) (P0.001), high triglyceride (P=0.005) were all the independent risk factors affecting survival of the children. Receiver operating characteristic curve indicated that APTT (AUC=0.753, P0.001) was more valuable than other risk factors in predicting death of the children. The cut-off value of APTT was 56.6 s, and the sensitivity and specificity of which was 55.6% and 89.7%, respectively.Hypohemoglobinemia, prolonged APTT, hypertriglyceridemia, and CNS involvement the risk factors affecting prognosis of HLH, and prolonged APTT shows a strong predictive value for death.儿童噬血细胞性淋巴组织细胞增生症预后相关因素分析.分析噬血细胞性淋巴组织细胞增生症(HLH)患儿的预后相关危险因素.回顾性分析深圳市儿童医院2009年1月至2017年5月143例符合HLH-2004诊断标准的HLH患儿临床表现及实验室检查,分析影响患儿预后的独立危险因素.患儿的中位年龄为1.9(0.1-14.3)岁,中位随访时间为6.7年(1天-11.9年);1个月、1年和10年总生存率分别为(87.4±5.5)%、(81.1±6.5)%和(81.1±6.5)%,死亡集中发生在发病后1年内;多因素分析结果显示,中枢神经系统受累(P=0.047)、血红蛋白降低(P=0.002)、活化部分凝血活酶时间延长(P0.001)、高甘油三酯(P=0.005)均是影响患儿生存的独立危险因素;受试者工作特征曲线分析提示,活化部分凝血活酶时间(AUC=0.753,P0.001)较其他危险因素预测死亡的价值更大,其预测死亡的截断值为56.6 s,灵敏度和特异度分别为55.6%和89.7.血红蛋白降低、活化部分凝血活酶时间延长、高甘油三酯及中枢神经系统受累是影响HLH预后的危险因素,其中活化部分凝血活酶时间延长对死亡具有较强的预测价值.
- Published
- 2021
8. Deep Implicit Moving Least-Squares Functions for 3D Reconstruction
- Author
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Xin Tong, Hao Pan, Hao-Xiang Guo, Peng-Shuai Wang, Yang Liu, and Shi-Lin Liu
- Subjects
FOS: Computer and information sciences ,Surface (mathematics) ,Artificial neural network ,Implicit function ,Computer science ,business.industry ,Computer Vision and Pattern Recognition (cs.CV) ,Deep learning ,3D reconstruction ,Computer Science - Computer Vision and Pattern Recognition ,Graphics (cs.GR) ,Octree ,Computer Science - Graphics ,Point (geometry) ,Artificial intelligence ,Moving least squares ,business ,Algorithm - Abstract
Point set is a flexible and lightweight representation widely used for 3D deep learning. However, their discrete nature prevents them from representing continuous and fine geometry, posing a major issue for learning-based shape generation. In this work, we turn the discrete point sets into smooth surfaces by introducing the well-known implicit moving least-squares (IMLS) surface formulation, which naturally defines locally implicit functions on point sets. We incorporate IMLS surface generation into deep neural networks for inheriting both the flexibility of point sets and the high quality of implicit surfaces. Our IMLSNet predicts an octree structure as a scaffold for generating MLS points where needed and characterizes shape geometry with learned local priors. Furthermore, our implicit function evaluation is independent of the neural network once the MLS points are predicted, thus enabling fast runtime evaluation. Our experiments on 3D object reconstruction demonstrate that IMLSNets outperform state-of-the-art learning-based methods in terms of reconstruction quality and computational efficiency. Extensive ablation tests also validate our network design and loss functions., Accepted by CVPR 2021, Code: https://github.com/Andy97/DeepMLS
- Published
- 2021
9. Vector Effects of Dissipative Soliton in All-Fiber MOPA System
- Author
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Ai-Ping Luo, Meng Liu, Zhi-Chao Luo, Xiang-Yue Li, Shi-Lin Liu, and Wen-Cheng Xu
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Physics ,lcsh:Applied optics. Photonics ,Vector soliton ,business.industry ,Amplifier ,lcsh:TA1501-1820 ,Polarization-maintaining optical fiber ,MOPA ,Polarization (waves) ,Atomic and Molecular Physics, and Optics ,fiber lasers ,Dissipative soliton ,Optics ,Dissipative vector solitons ,Fiber laser ,Pulse wave ,lcsh:QC350-467 ,high-energy pulses ,Soliton ,Electrical and Electronic Engineering ,business ,lcsh:Optics. Light - Abstract
The performance of seed laser source will have a great impact on the output pulse quality of the master oscillator power amplifier (MOPA) system. Here, we report the influence of the soliton vector features on the pulse uniformity in an all-fiber MOPA configuration. We demonstrated that, although the intensity of the dissipative soliton seed source is uniform, the intensity of the output pulse train from the MOPA will show fluctuations if the soliton polarization state is not locked, i.e., polarization-rotating vector soliton. It is found that the appearance of non-uniform pulse intensity is caused by the combination of the polarization instability and the polarization dependent gain in the polarization maintaining fiber amplifier. The obtained results indicate that the polarization evolution of seed pulsed source is critical to generation of stable pulse train from the MOPA, and also might be useful to the communities dealing with solitons and high-power pulsed fiber lasers.
- Published
- 2019
10. High- and Low-Frequency Probe Tone Tympanometry in Chinese Infants
- Author
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Ying-ying, Shang, Dao-feng, Ni, and Shi-lin, Liu
- Published
- 2007
- Full Text
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11. Effects of polymorphic form and particle size of SiO2 fillers on the properties of SiO2–PEEK composites
- Author
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Jian Jiang Bian, Shi Lin Liu, and Peng Jie Xue
- Subjects
QC501-721 ,Materials science ,Dielectric ,mechanical properties ,Condensed Matter Physics ,Thermal expansion ,sio2/peek composites ,Electronic, Optical and Magnetic Materials ,Thermal conductivity ,Electricity ,dielectric properties ,Thermal ,Ceramics and Composites ,Peek ,thermal conductivity ,Particle size ,Electrical and Electronic Engineering ,Composite material ,thermal expansion - Abstract
The effects of polymorphic form and particle size of SiO2 fillers on the dielectric, mechanical and thermal properties of SiO2–Polyetheretherketone (SiO2–PEEK) composites were investigated in this paper. Strong low frequency (2 fillers. All the composites obtained in this case demonstrate the dielectric permittivities of [Formula: see text] at high frequencies. The crystalline [Formula: see text]-cristobalite filled composite exhibits lower dielectric loss and mechanical strength, but larger thermal expansion coefficient and thermal conductivity, compared with the similar particle sized amorphous SiO2 filled one. The crystalline [Formula: see text]-quartz filled composite demonstrates the lowest mechanical strength and highest dielectric loss. An increase in particle size of the spherical fused silica fillers decreases the dielectric loss, while increases the thermal conductivity of the composite. The flexural strength of the composite reaches the maximum value of 113 MPa when the particle size of spherical SiO2 filler is [Formula: see text]m. Particle packing by combining optimal amounts of differently sized spherical fused silica fillers leads to a substantial improvement of mechanical strength (153MPa) coupled with reasonable dielectric and thermal properties due to the synergic effect (dielectric permittivity ([Formula: see text] = 3.35, dielectric loss (tan[Formula: see text] @10 GHz, thermal conductivity ([Formula: see text] = 0.74 W/m*k ([Formula: see text]C), coefficient of thermal expansion ([Formula: see text]C and relative density ([Formula: see text]) = 99.72%).
- Published
- 2021
12. Rolling guidance normal filter for geometric processing
- Author
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Xin Tong, Yang Liu, Xiao-Ming Fu, Peng-Shuai Wang, Baining Guo, and Shi-Lin Liu
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Scale (ratio) ,business.industry ,Geometry processing ,Computer Graphics and Computer-Aided Design ,Face (geometry) ,Polygon mesh ,Segmentation ,Computer vision ,Artificial intelligence ,Bilateral filter ,Focus (optics) ,business ,Smoothing ,ComputingMethodologies_COMPUTERGRAPHICS ,Mathematics - Abstract
3D geometric features constitute rich details of polygonal meshes. Their analysis and editing can lead to vivid appearance of shapes and better understanding of the underlying geometry for shape processing and analysis. Traditional mesh smoothing techniques mainly focus on noise filtering and they cannot distinguish different scales of features well, even mixing them up. We present an efficient method to process different scale geometric features based on a novel rolling-guidance normal filter. Given a 3D mesh, our method iteratively applies a joint bilateral filter to face normals at a specified scale, which empirically smooths small-scale geometric features while preserving large-scale features. Our method recovers the mesh from the filtered face normals by a modified Poisson-based gradient deformation that yields better surface quality than existing methods. We demonstrate the effectiveness and superiority of our method on a series of geometry processing tasks, including geometry texture removal and enhancement, coating transfer, mesh segmentation and level-of-detail meshing.
- Published
- 2015
13. Research on newly urbanized towns and districts in China
- Author
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Shu-cheng Zhang, Wei Yu, Xiao-jing Wang, Rong Sheng, Xin-jing Liu, and Shi-lin Liu
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Multidisciplinary ,Work plan ,Geography ,Central government ,Urbanization ,Scale (social sciences) ,Regional science ,Plan (drawing) ,China ,Civil engineering ,Preliminary analysis - Abstract
Since the last decade the central government endeavors to promote large scale of urbanization in China. Lots of new urban towns and districts are taking shape. Outline of the 12th Five-year Plan released by the central government points out that the new towns and districts are to be regulated. But few researches are considering the new towns and districts especially in the spatial distributive pattern and status in China. Given this situation this paper, after sorting out the world-wide research and development of new urban towns and districts, gives definitions of broad and narrow meanings. Based on the broad meaning definition, the database of new towns and districts in China is established. This paper then conducts a preliminary analysis of the new towns and districts. Then the two-step work plan and the advices are also proposed to further improve the research and practice of its kind in China.
- Published
- 2014
14. Investigation on Control Strategies to Smooth out Wind Farm Output Fluctuations Using Energy Storage System
- Author
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Yuan Liu, Shi Lin Liu, and Jin Yu Wen
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Pumped-storage hydroelectricity ,Power optimizer ,Engineering ,Wind power ,business.industry ,Control theory ,Control system ,Grid code ,General Medicine ,business ,Grid ,Energy storage ,Power (physics) - Abstract
Due to characteristics of random fluctuations and intermittence, large-scale wind power integration will worsen grid stability and power quality. According to grid code, a limit of ramp rate for both 1 minute and 10 minutes should be put on the interconnected power. Using energy storage system is an effective way to smooth the fluctuations of wind farm output. Due to the high cost of the energy storage system, an effective control of the energy state and the BESS charge and discharge rate acquiring a maximum utility of the limited energy storage to improve the output power quality becomes increasingly significant. A coordinated control method for BESS to smooth out wind power fluctuations and to limit wind power ramping rate as required by grid code is proposed, with the BESS energy state well controlled and the predicted wind power used to cope with emergent situation. The effictiveness of the control system is validated through real wind farm cases under MATLAB platform.
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- 2014
15. Evolution assessment of china’s three mega-city regions based on entire-array-polygon method
- Author
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Shi-lin Liu, Rong Sheng, Xin-jing Liu, Yi-wei Zhang, Xiao-jing Wang, and Duo Kong
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Urban primacy ,Urban economics ,Multidisciplinary ,Geography ,Index (economics) ,Megacity ,Urban planning ,Urbanization ,Urban culture ,Economic geography ,China - Abstract
Mega-city region is the mainstream of global urban development and also the dominant model of the neo urbanization process in China. The Beijing-Tianjin-Hebei area, Yangtze River Delta area and Pearl River Delta area are China’s three largest and most mature mega-city regions, the status of which represents the general level of the urban and regional development in China. Based on entire-array-polygon method, this paper makes a comprehensive evolution assessment of the three mega-city regions in terms of urban population index, urban economy index, urban life index, urban culture index and urban primacy index. In terms of general developing level, the three mega-city regions have progressed to optimize the structure. With their respective advantages and disadvantages, the three mega-city regions initially realize a “diversified” regional layout. The difference and gap among the three mega-city regions are obviously decreasing, which contributes to the regional balance of China metropolitan development. The rankings of the three mega-city regions will be in a continuous adjustment. The Beijing-Tianjin-Hebei area is possible to catch up and take the lead.
- Published
- 2013
16. Test Analysis of Shear Performance on Young-Old Concrete Interface between Bonded Rebar and Groove
- Author
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Xiao Gang Li, Hao Sun, and Shi Lin Liu
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Brittleness ,Materials science ,Shear (geology) ,law ,business.industry ,Rebar ,Shear resistance ,Test analysis ,General Medicine ,Structural engineering ,business ,law.invention - Abstract
The young-old concrete can work together as a whole is the key issue of structural strengthening. Aiming at the technical selection problem appeared frequently in the bridge strengthening about the young-old concrete interface treatments between bonded rebar and grooving, 12 specimens were designed to compare with the shear performance and failure modes of the young-old concrete interface. The test results show that the failure characteristics of specimens which embedded steel bars are ductile, but the failure characteristics of specimens which slotted are brittle and the new concrete in slot position were cut off. And the young-old concrete interface shear strength of the specimens which embedded steel bars was distinctly stronger than that of the slotted specimens. So, the treatment of bonded rebar is proposed during the structural strengthening design. At the same time, the depth and distance of the bonded rebar should be well controlled.
- Published
- 2013
17. Calculation and Analysis on Flexural Strengthening with CFRP Laminate Considering the Preexisting Strain
- Author
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Hao Sun, Shi Lin Liu, and Xiao Gang Li
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Materials science ,Strain (chemistry) ,Flexural strengthening ,Plane (geometry) ,business.industry ,Residual strain ,Influence analysis ,Relative depth ,General Medicine ,Structural engineering ,Reinforcement ,Compression (physics) ,business - Abstract
The preexisting strains of structures have some influence on the efficiency of CFRP Laminate. Based on the analysis of the abundant existing research productions, the calculation formulas of CFRP Laminate are proposed based on the supposition of plane section and balance of forces considering the preexisting strain. And the formulas are easy to understand and master for designers. By discussing the relation between the preexisting strain and relative depth of compression area, the essentials of the impact on reinforcement effect of residual strain are confirmed. The results can offer reference bases for strengthening engineering design with CFRP.
- Published
- 2013
18. Ka-band multi-focus and pattern manipulation in near-field based on three-dimensional printed transmit-array antenna.
- Author
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Shi Lin Liu, Xian Qi Lin, and Zhong Bo Zhu
- Subjects
- *
WIRELESS power transmission , *THREE-dimensional printing , *ANTENNAS (Electronics) , *SUPERPOSITION principle (Physics) , *ANTENNA radiation patterns , *NEAR-fields , *RADIO frequency - Abstract
A simple method to achieve multi-focus and pattern manipulation in antenna near field (NF) is proposed in this study, whose effectiveness is then validated by measurements based on different transmit-array antennas. The radiating aperture is divided into several regions and each region corresponds to one assigned focal point, thus achieving multi-focusing performance. Then, the superposition principle is employed and constrains the multiple foci into a certain area to get a contoured pattern. Three examples are investigated. Ant-A presents four balanced focal spots simultaneously, while Ant-B presents two unbalanced foci. A square flat-top field pattern is obtained for Ant-C. Three-dimensional printing technology is employed to fabricate these lenses, resulting in a low cost and light weight. Measured results coincide well with the numerical design and simulation. The proposed method provides a simple and effective alternative for NF power redistribution and owns great value in such applications as radio-frequency identification, wireless power transmission, millimetre-wave imaging etc. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
19. Influence Analysis of Parameters Variation on Dynamic Characteristic for Concrete Filled Steel Tubulur Arch Bridge
- Author
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Xiao Gang Li, Hao Sun, and Shi Lin Liu
- Subjects
Engineering ,business.industry ,Rigidity (psychology) ,General Medicine ,Structural engineering ,Bridge (interpersonal) ,Brace ,Bracing ,Finite element method ,Vibration ,Beam bridge ,Geotechnical engineering ,Arch ,business - Abstract
The main bridge of Zhengzhou Yellow River 2nd bridge is a concrete filled steel tubulur (CFST) arch bridge. Choosing the main bridge as the research object, the finite element procedure ANSYS was used to establish the 3D finite element dynamic model. In order to analyze the influence of structural Parameters variation on dynamic characteristic,17 different conditions were considered in the calculation and analysis process. The results show that the CFST arch bridge is a flexible structure. The vertical rigidity of the bridge is stronger than the lateral rigidity CFST arch rib. The changes of the transverse brace style have little effect on the vertical rigidity, but have great impacts on the lateral rigidity of the CFST arch rib. It is sensitive on the first step vibration if the bracing tube damage. But the bracing tube damage has little effect on the vertical rigidity. The damages of suspenders and bridge deck slabs influence weakly on the vibration modes.
- Published
- 2013
20. Preferred Selection on Strengthening Schemes of Arch Bridge Based on Fuzzy Analytic Hierarchy Method
- Author
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Hao Sun, Shi Lin Liu, and Xiao Gang Li
- Subjects
Scheme (programming language) ,Hierarchy ,Engineering ,Mathematical optimization ,Process (engineering) ,business.industry ,General Medicine ,Fuzzy logic ,Bridge (interpersonal) ,Precondition ,Transport engineering ,Arch ,business ,computer ,Reliability (statistics) ,computer.programming_language - Abstract
Many factors need to be considered during the choice of strengthening scheme for arch bridges, and most factors are fuzzy. The reasonable and scientific strengthening scheme is an important precondition to ensure the effectiveness and quality of the strengthening engineering. The elementary objects of the bridges strengthening are effect reliability, economic reasonability, technological feasibility, and convenience of construction, which are used to appraise the strengthening scheme. Based on the basic objective of bridge strengthening, two levels fuzzy comprehensive appraisal index system of strengthening scheme are established, and the best scheme is chosen. Combining the idiographic example of arch bridge reinforcement, the process of fuzzy analytic hierarchy and optimum result is given. The result tests that fuzzy analytic hierarchy method is feasible during the preferred selection on strengthening schemes of arch bridge.
- Published
- 2013
21. Voice Activity Based on Noise Estimation in Noisy Environments
- Author
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Shi Lin Liu and Zheng Pei
- Subjects
Noise estimation ,Noise measurement ,Computer science ,business.industry ,Noise reduction ,Process (computing) ,Pattern recognition ,General Medicine ,Artificial intelligence ,business ,Signal ,Energy (signal processing) ,Voice activity - Abstract
An improved project based on decision trees in noisy environments is proposed for robust endpoints detection. Firstly, the noise level of the environment is estimated by wavelet decomposition, and then whether the denoising process is done according to the noise level is determined. Next, the thresholds are obtained by decision trees for the signal. Finally, endpoints are detected by the double thresholds on different importance of the energy and zero-crossing rate (ZCR) in the corresponding situation. The simulation results indicate that the proposed method based on noise estimation can obtain the same accurate data by computing less than the one with decision trees.
- Published
- 2012
22. Young表与$\textrm{U}_{q}(\mathrm{osp}(1|2n))$的晶体基
- Author
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Yang Shi-Lin Liu Jun-Li
- Subjects
General Medicine ,General Chemistry - Abstract
设 $U_q(\mathrm{osp}(1|2n))$是对应Lie超代数$\mathrm{osp}(1|2n)$的量子包络超代数. 利用满足一定条件的半标准Young表, 给出有限维既约$U_q(\mathrm{osp}(1|2n))$模晶体图的实现 . 建立晶体图张量积分解的广义Littlewood-Richardson法则.
- Published
- 2009
23. Geochemistry of Middle Oligocene-Pliocene sandstones from the Nanpu Sag, Bohai Bay Basin (Eastern China): Implications for provenance, weathering, and tectonic setting
- Author
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Shi-lin Liu, Ye Zhou, Fa-xiong Gong, Ge Lin, Yunhua Liu, and Yi Yan
- Subjects
Provenance ,Geophysics ,Felsic ,Source rock ,Geochemistry and Petrology ,Pacific Plate ,Eurasian Plate ,Geochemistry ,Weathering ,Fold (geology) ,Structural basin ,Geology - Abstract
Major, trace and rare earth elements of 37 sandstones of the Middle Oligocene-Pliocene from the Nanpu Sag, Bohai Bay Basin were analyzed to evaluate their provenance, weathering, tectonic setting. Low-intermediate values of the Chemical Index of Alteration (CIA) reveal that these sandstones experienced relatively weak chemical weathering. Trace element ratios and REE characteristics show that the source rocks mainly consisted of felsic magmatic rocks that formed in the Yanshan Fold Belt during Mesozoic Yanshanian period. Tectonic setting discrimination diagrams show that the sandstones were deposited in a reactivated inner-continental setting, supporting the origin of the Bohai Bay Basin as being related to subduction of the Pacific plate towards the Eurasian plate.
- Published
- 2007
24. Numerical Simulations of Structural Deformation and Fluid Flow in Xiangshan Deposit
- Author
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Ge Lin, Ye Zhou, Fa-xiong Gong, and Shi-lin Liu
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geography ,Mineralization (geology) ,geography.geographical_feature_category ,Computer simulation ,Mechanical Engineering ,Energy Engineering and Power Technology ,Mineralogy ,Fault (geology) ,Geotechnical Engineering and Engineering Geology ,Mineral exploration ,Uranium ore ,Fuel Technology ,Volcano ,Breccia ,Fluid dynamics ,Petrology ,Engineering (miscellaneous) ,Geology - Abstract
The Xiangshan deposit in Jiangxi province is one of the most important uranium deposits in China. The aim of this study is to achieve a better understanding of mineralization in the Xiangshan deposit through numerical simulation. In order to find the most favorable locations of mineralization and to help further mineral exploration, a coupling deformation and fluid flow model has been established to describe the mineralization process. In this model, the simulation reconstructs the strata deformations under fields of compressive stress and thrust structure on the hanging wall of the Zou-Shi fault. Compared with practical information, the simulation results are consistent with the No. 51 exploration section of the western Xiangshan. In addition, on the basis of geological information provided by previous investigators, the model simulates the flow process of fluids under compressive stress fields. The result suggests that many tensional areas are formed, which can help the fluid flowing upward from deeper parts. The fluid is easy to concentrate on the breccia fractured zone between two volcanic layers, especially on the intersection parts with faults, resulting in the formation of favourable locations of mineralization. In addition, the model is significant in guiding the exploration of uranium deposits in the western Xiangshan and provides clues for further exploration of deposits.
- Published
- 2006
25. Electric and magnetic resonances in optical metamaterial for efficient absorption enhancement in ultrathin CdTe-based photovoltaic cells
- Author
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Mingyuan Huang, Chuan-Kun Liu, Yu-Meng You, Yu-Jun Zhang, Lin Cui, Shi-Lin Liu, and Gao-Min Li
- Subjects
Materials science ,Condensed Matter::Other ,business.industry ,Physics::Optics ,Metamaterial ,Resonance ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Light scattering ,Cadmium telluride photovoltaics ,Electronic, Optical and Magnetic Materials ,Photonic metamaterial ,law.invention ,Condensed Matter::Materials Science ,Optics ,law ,0103 physical sciences ,Solar cell ,Optoelectronics ,Thin film ,010306 general physics ,0210 nano-technology ,business ,Absorption (electromagnetic radiation) - Abstract
Light absorption plays a key role in photovoltaic devices, especially in thin-film CdTe-based solar cells. Here we study the enhancement of optical absorption in a ultrathin CdTe layer by embedding it into optical magnetic metamaterials. In a periodic metal-CdS-CdTe-metal sandwiched structure, the absorption of transverse magnetic polarized light has been significantly enhanced. The maximum enhancement is around 3 times, which is attributed to the strong local field enhancement in the CdTe thin film. Importantly, due to the coexistence of large electric resonance and magnetic resonance in magnetic metamaterials, the enhancement of light absorption has been obtained in a broadband from 400 nm to 800 nm, which is almost 1.5 times of that of the conventional CdTe-based photovoltaic device and covers the strongest part of the solar spectrum. Moreover, such absorption enhancement is also valid for a wide range of incident angles. We believe that our finding can lead to a variety of important applications in ultrathin CdTe-based solar cell technology.
- Published
- 2016
26. Enhancement of magnetic dipole emission at yellow light with polarization-independent hexagonally arrayed nanorods optical metamaterials
- Author
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Chuan-Kun Liu, Gao-Min Li, Mingyuan Huang, Yu-Meng You, Shi-Lin Liu, Lin Cui, and Yu-Jun Zhang
- Subjects
Materials science ,business.industry ,Physics::Optics ,Metamaterial ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Polarization (waves) ,01 natural sciences ,Electronic, Optical and Magnetic Materials ,Photonic metamaterial ,Dipole ,Electric field ,0103 physical sciences ,Optoelectronics ,Nanorod ,Spontaneous emission ,010306 general physics ,0210 nano-technology ,business ,Magnetic dipole - Abstract
Here we demonstrate the control of magnetic dipole spontaneous emission at yellow light by polarization-independent hexagonally arrayed nanorods magnetic metamaterials. By embedding a magnetic dipole into a polarization-independent magnetic metamaterial consisting of hexagonal arrays of paired silver nanorods, the radiative emission enhancement and the Purcell factor around 590 nm have been dramatically increased 44 times for a significant general far-field emission enhancement and 57 times for a maximum general magnetic dipole near-field emission enhancement, respectively. Moreover, the polarization-independent enhancements are found to be a robust variation of the dipole’s positions and structure geometries, showing nice fabrication tolerance for practical applications.
- Published
- 2016
27. [A clinical study of paradoxical breathing during sleep in children]
- Author
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Juan, Gao, Ya-mei, Zhang, Shi-lin, Liu, Jie, Zhang, and Jia-qing, An
- Subjects
Male ,Sleep Apnea Syndromes ,Adolescent ,Case-Control Studies ,Child, Preschool ,Polysomnography ,Respiration ,Snoring ,Humans ,Female ,Child - Abstract
Abnormal breathing during sleep included many patterns. In this study, we investigated paradoxical breathing patterns during sleep in children using standard polysomnography (PSG).Children who come to the ENT because of snoring were included into the study consecutively. Those who had craniofacial anomalies, diabetes, chronic lung diseases, and neuromuscular diseases were excluded. At the same time, no sleep snoring children were include as controls. Thirty-eight snoring children and twenty-six no snoring children were recruited. Polysomnography (PSG) was performed on all subjects. We determined the frequency of paradoxical breathing patterns during sleep through blind analysis of polysomnograms obtained in all subjects and compared the difference between children with snoring and normal controls.The appearance of paradoxical breathing was assessed in all subjects. Among children with snoring, the apparent amount of paradoxical breathing time and the percent of paradoxical breathing time spent in total sleep time (x(-) ± s) were (70.1 ± 40.4) min and 17.9% ± 11.0% respectively. Comparing with control group (28.2 ± 25.7) min and 7.3% ± 6.8%, there was obvious difference (paradoxical breathing time t = 5.060, percent of paradoxical breathing time t = 4.767, P0.05). Thirty-eight snoring children were divided into normal-mild group (eighteen children) and moderate-severe group (twenty children). The children whose PSG results were normal and mild had more paradoxical breathing time and the percent of paradoxical breathing time than moderate-severe group. The apparent amount of paradoxical breathing time of normal-mild group, moderate-severe group and control group were (85.9 ± 31.7) min, (55.8 ± 42.7) min and (28.2 ± 25.7) min. Among the three groups, there was obvious difference (F = 15.897, P0.05). The percent of paradoxical breathing time of the three groups were 22.0% ± 10.2%, 14.1% ± 10.5% and 7.3% ± 6.8% (F = 14.167, P0.05).Currently published polysomnographic scoring recommendations overlook some common breathing abnormalities during sleep that are associated with clinical complaints. Paradoxical breathing is abnormal breathing patterns during sleep and its appearance is used to aid in the identification of respiratory events.
- Published
- 2010
28. [Diagnostic procedures for pediatric otitis media with effusion]
- Author
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Shi-lin, Liu, Wei-yi, Liu, Gui-xiang, Wang, Ya-mei, Zhang, Jie, Zhang, Peng, Sun, Su-min, Jiang, Li, Zhang, and Jun, Gao
- Subjects
Male ,Acoustic Impedance Tests ,Otitis Media with Effusion ,Child, Preschool ,Audiometry, Pure-Tone ,Humans ,Female ,Child - Abstract
To evaluate the fluid in middle ear of otitis media with effusion (OME) by tympanometry, hearing threshold and in order to an effective and promptly way for treatment.Forty Patients (75 ears) with OME were collected since January 2007 to June 2008. The history of hearing loss, hearing threshold, CT results and the final fluid in the middle ear during operation were analyzed.There were 28 males and 12 females enrolled in this study. The average age of the patients was 78 months. All the 75 ears were with type "B" according to tympanometry test. For all the patients myringotomy was performed and the ventilation tubes were placed in 23 ears. Among all the ears, there were fluid in 62 ears (82.7%) and no fluid in 13 ears (17.3%). There was correlation between the levels of hearing loss, CT results and the fluid in middle ear (P0.05).Tympanometry and hearing threshold results should have a better sensitivity and specificity rates for diagnosis of OME.
- Published
- 2009
29. [The mechanism of prophylactic effects of nasal tolerance with a dual analogue on experimental autoimmune myasthenia gravis in young mice]
- Author
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Shi-Lin, Liu and Zhi, Huang
- Subjects
Mice, Inbred C57BL ,Mice ,Immunoglobulin G ,Immune Tolerance ,Animals ,Female ,Receptors, Cholinergic ,T-Lymphocytes, Regulatory ,Administration, Intranasal ,Myasthenia Gravis, Autoimmune, Experimental - Abstract
To study the prophylactic effects of nasal tolerance with a dual analogue, Lys262-Ala207, on the mouse model of experimental autoimmune myasthenia gravis (EAMG) and the underlying mechanism.Mouse model of EAMG was induced by intraperitoneal injection of mAb35. Lys262-Ala207 or PBS was given nasally before 10 days (study group A and control group A) or on the day (study group B and control group B) of immunization for 10 days. Clinical syndromes were evaluated after immunization. Serum level of acetylcholine receptor antibody (AChR-Ab) IgG was detected using ELISA. The number of monouclear cells expressing CD4+ and CD4+ CD25+T from spleen was measured using flow cytometry.Compared with the corresponding control groups, the clinical syndromes were improved (P0.01) in mice from the study groups A and B. The positive rate of the repetitive nerve stimulation (RNS) test in the study groups A and B was significantly lower than that in the corresponding control groups (P0.01). The study group A showed lower positive rate of RNS than the study group B (P0.05). The serum levels of AChR-Ab IgG in the study groups A and B (15.01+/-1.09 and 19.23+/-1.31 microg/mL) decreased compared with that in the corresponding control groups (28.12+/-1.28 and 29.35+/-1.28 microg/mL) (P0.01). The study group A mice had lower serum AChR-Ab IgG levels than the study group B (P0.01). The number of CD4+ CD25+T cells in the study groups A (4.516+/-0.598%) and B (3.671+/-0.300%) increased significantly compared with that in the corresponding control groups (2.661+/-0.411% and 2.412+/-0.500%) (P0.01) and more CD4+ CD25+T cells were found in the study group A than in the study group B (P0.01).Nasal administration with dual analogues may ameliorate clinical syndromes in EAMG rats, which may be associated with decreased serum AChR-Ab IgG levels and increased number of CD4+ CD25+T cells from spleen.
- Published
- 2008
30. [Comparison of the low and high frequency tympanometries as diagnostic tests of middle ear function in infants]
- Author
-
Ying-ying, Shang, Dao-feng, Ni, and Shi-lin, Liu
- Subjects
Male ,Acoustic Impedance Tests ,Hearing Tests ,Evoked Potentials, Auditory, Brain Stem ,Ear, Middle ,Humans ,Infant ,Female - Abstract
To evaluate the effect of low frequency and high frequency tympanometry in the diagnosis of middle ear function of infants.Tympanometries with 226 Hz, 678 Hz and 1000 Hz probe tones were obtained from infants aged 5-25 weeks with normal ABR (15 infants, 30 ears) and those with prolonged Wave I latency suggesting middle ear dysfunction (17 infants, 20 ears) using GSI Tympstar middle ear analyzer.The type, peak pressure, peak compensated static acoustic admittance and gradient of 226 Hz tympanometry were of no significant differences between two groups. The pattern of 678 Hz tympanograms for admittance, susceptance and conductance included non-peaked, single-peaked, W-shaped and three-peaked type in both groups. The consistency between auditory brainstem response (ABR) and 678Hz tympanometry for admittance, susceptance and conductance were 70.0%, 58.0%, 64.0% (kappa = 0. 324,0. 234,0. 118) respectively. A single peaked tympanogram was typical in normal infants for 1000 Hz admittance, susceptance and conductance tympanograms and there were 28 ears (93.3%), 25 ears (83.3%) and 26 (86.7%) respectively. Tympanogram without any positive peak was the most characteristic for a probe frequency of 1000 Hz in infants with prolonged wave I latency and there were 15 ears (75%), 17 ears (85%) and 13 ears (65%) respectively. For admittance, susceptance and conductance, the consistency between 1000 Hz tympanometry and ABR were 90.0%, 92.0% and 86.0% and kappa were 0.783, 0.831 and 0.690, respectively.1000 Hz probe tone tympanometry was accurate diagnostic tests for middle ear function in infants younger than 25 weeks of age, while 226 Hz and 678 Hz probe tone tympanometries were not.
- Published
- 2006
31. [Influence of obstructive sleep apnea-hypopnea syndrome in children on hearing problem]
- Author
-
Shi-Lin, Liu, Wei-Yi, Liu, Ya-Mei, Zhang, Su-Min, Jiang, Li, Zhang, and Xiao-Hua, Wang
- Subjects
Male ,Sleep Apnea, Obstructive ,Acoustic Impedance Tests ,Hearing ,Child, Preschool ,Polysomnography ,Audiometry, Pure-Tone ,Humans ,Female ,Blood Gas Analysis ,Child - Abstract
To analyze the effects of obstructive sleep apnea hypopnea syndrome on hearing among children.One hundred and forty three apnea children proved with overnight polysomnography received pure tone audiometry, acoustic impedance test, and lateral nasopharyngeal airway X-ray. Hearing threshold level and blood oxygen's saturation, apnea hypopnea index were analyzed.Among the 127 cases,63 cases had type C or B tympanograms, and 33 of them had lifted hearing threshold level. The remaining 64 cases had normal hearing and tympanograms. It was found correlation between the A/N ratio and blood oxygen's saturation, and no correlation between the A/N ratio and average of hearing threshold level. There was no correlation between AHI and average of hearing threshold level of each group. Hearing level can be improved after adenoidectomy or adenotonsillectomy.The upper airway obstruction due to adenotonsillar enlargement is common in children. It also affects the middle-ear impedance. Although short -term and mild degree of hypoxemia has few influence on hearing threshold level, it may affect cochlear function.
- Published
- 2005
32. [A study of high altitude environment affecting on worker's health during the constructing Qinghai-Xizang railway]
- Author
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Xue-yun, Fan, Yu-ping, Bai, Jun, Li, Jin-yuan, Zhao, Shu-jie, Cui, Dan, Li, Tong-chun, Zhu, Shou-quan, Ding, Jing-liang, Liu, and Shi-lin, Liu
- Subjects
Adult ,Cohort Studies ,Leukocyte Count ,Health Occupations ,Acclimatization ,Altitude ,Erythrocyte Count ,Humans ,Blood Pressure ,Altitude Sickness ,Middle Aged - Abstract
To study high altitude environment affecting on worker's healthUsing the cohort study, the altitude reaction was investigated and the WBC, RBC, Hb and oxygenation indexes were measured on workers in several periods, namely, acclimatization period, initially arrived high altitude and resident 90 days.The 83.3% of men had altitude reactions with different kinds at initially arrived high altitude. The headache was the most. The rate of abnormal blood pressure increased with altitude and resident time (P0.01). The rate of 90 day's group was 41.7%. The rise of diastole pressure was obvious (P0.01). As the beginning of arrived highland, the increase of WBC, RBC were significant (P0.01). The increase of Hb appeared only in 90 day's group. The level of malondialdehyde (MDA) obviously increased during acclimatization period and increased with altitude and resident time (P0.01). The activity of catalase (CAT), glutathione peroxidase (GSH-Px), superoxide dismutase (SOD) increased significantly in 90 day's group [(222.36 +/- 36.52) x 10(3) U/L, (158.49 +/- 14.42) U/L, (45.74 +/- 8.31) NU/ml respectively] (P0.01).The high altitude environment may result in the abnormal blood pressure, the rise of diastolic pressure was important. It lead to the increase of WBC, RBC, Hb. It initiated activity of oxygenation reaction. The symptoms of headache, dizziness, loss of appetite and insomnia appeared as working in high altitude environment.
- Published
- 2004
33. In situ Detection of Amide A Bands of Proteins in Water by Raman Ratio Spectrum.
- Author
-
Cheng-qian Tang, Ke Lin, Xiao-guo Zhou, and Shi-lin Liu
- Abstract
Copyright of Chinese Journal of Chemical Physics (1674-0068) is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2016
- Full Text
- View/download PDF
34. Genome size determination of sea cucumber (Apostichopus japonicus)
- Author
-
Lin Su, Shi-lin Liu, Jin Liu, Shao-guo Ru, Hong-sheng Yang, and Xiaojun Zhang
- Subjects
Whole genome sequencing ,biology ,Breeding program ,business.industry ,Captivity ,Zoology ,Management, Monitoring, Policy and Law ,Aquatic Science ,biology.organism_classification ,Sea cucumber ,Aquaculture ,Apostichopus japonicus ,Botany ,Aestivation ,business ,Genome size ,Ecology, Evolution, Behavior and Systematics - Abstract
Sea cucumber(Apostichopus japonicus) is one of the most important economic aquaculture spe-cies in China.The study on the genome size(C-value) is highly significant because it plays an important role in instructing the hybridization breeding and improved variety breeding program,as well as in esti-mating the cost of the whole genome sequencing project.Previous studies mainly focused on these re-search areas such as ecology,physiology,nutrition etc.However,it is relatively scarce for the accumulation of basic data related to the genome size and characteristics in A.japonipus.Therefore,the measure of ge-nome size for enriching cytogenetics data of this species is meaningful.In this paper,the genome size(C-value) of sea cucumber,A.japonicus was measured through flow cytometry in 52 individuals,which came from aestivation,normal and wild groups,using erythrocyte DNA content of chicken,Gallus domesticus(2.5pg/2C) as internal standard.The result indicates that the C-value of A.japonicus is(0.90± 0.06) pg,equivalent to(880.2±72.26) Mb.And,the C-values of aestivation,normal and wild are(0.93±0.05) pg,(0.90±0.05) pg and(0.84±0.02) pg,respectively.In addition,analyzed by Independent-Samples T Test,it shows that the C-values have no significant difference in aestivation and normal groups,whereas,the C-values of wild group and that reared in captivity group have significant difference.In other words,there is no correlation between genome size and the physiology factor-aestivation,while the stability of envi-ronment factors has certain influences on genome size variation.Moreover,the development of C-value measure method was elucidated in detail,in the meanwhile,the relationship between C-value and the evo-lution in Holothuroidea was discussed in combination with genome size of other types of sea cucumber.
- Published
- 2012
35. Solvent Effect on the Photoinduced Electron Transfer Reaction Between Thioxanthen-9-one and Diphenylamine.
- Author
-
Lin Chen, Qiao-hui Zhou, Xiang Liu, Xiao-guo Zhou, and Shi-lin Liu
- Abstract
Photoinduced chemical reaction between thioxanthen-9-one (TX) and diphenylamine (DPA) were investigated by the nanosecond laser flash photolysis. With photolysis at 355 nm, the triplet TX (
3 TX*) is produced via a Franck-Condon excitation and intersystem crossing. In the transient absorption spectra of the reduction of3 TX* by DPA in pure and aqueous CH3 CN, four bands are clearly observed and assigned to absorption of3 TX*, TXH. , TX.- and DPA.+ , respectively. With the increase of solvent polarity, the blue-shift was observed for all absorption bands of the intermediates. With the aid of dynamic decay curves, an electron transfer followed by a protonation process is confirmed for the reduction of3 TX* by DPA. The quenching rate constants of3 TX* by DPA very slightly decrease from 9.7×109 L/(mol·s) in pure CH3 CN, to 8.7×109 L/(mol·s) in CH3 CN:H2 O (9:1), 8.0×109 L/(mol·s) in CH3 CN:H2 O (4:1) and 7.5×109 L/(mol·s) in CH3 CN:H2 O (1:1). Therefore water plays a minor role in the title reaction, and moreover no obvious medium effect of solvent polarity is observed for the electron transfer between3 TX* and DPA, indicating that the3 nπ* and3 ππ* states of TX have the approximate ability to attract an electron from DPA. [ABSTRACT FROM AUTHOR]- Published
- 2015
- Full Text
- View/download PDF
36. Populations of Ethanol Conformers in Liquid CCl4 and CS2 by Raman Spectra in OH Stretching Region.
- Author
-
Nai-yin Hu, Ke Lin, Xiao-guo Zhou, and Shi-lin Liu
- Abstract
Combining Raman spectroscopy with density functional theory, the populations of the trans-and gauche-ethanol conformers are investigated in carbon tetrachloride (CCl
4 ) and carbon disulfide (CS2 ). The spectral contributions of two ethanol conformers are identified in OH stretching region. The energy difference between both conformers is estimated with the aid of the calculated Raman cross sections. It can be seen that the trans-ethanol is more stable in CCl4 and CS2 solutions. The spectra are also obtained at different temperatures, and it is found the van't Hoff analysis is invalid in these solutions. By taking accounts of the Boltzmann distribution and theoretical Raman cross section, the energy difference is found to be increased with temperature, which shows the weak intermolecular interactions can enhance the population of trans-ethanol. [ABSTRACT FROM AUTHOR]- Published
- 2015
- Full Text
- View/download PDF
37. Accurate Measurement of Raman Depolarization Ratio in Gaseous CO2.
- Author
-
Yu-juan Jin, Yuan-qin Yu, Yu-xi Wang, Ke Lin, Xiao-guo Zhou, and Shi-lin Liu
- Abstract
The Raman depolarization ratios of gaseous CO
2 in the spectral range of 1240-1430 cm-1 are determined with a sensitive photoacoustic Raman spectroscopy, and more accurate data compared to the literature results are presented. The precision of the obtained depolarization ratio is achieved by measuring and fitting the dependence of the PARS signal intensity on the cross angle between the polarizations of two incident laser beams. [ABSTRACT FROM AUTHOR]- Published
- 2015
- Full Text
- View/download PDF
38. Experimental study on the chirped structure of the white-light continuum generation by femtosecond laser spectroscopy
- Author
-
Dong-Hui, Quan, primary, Shi-Lin, Liu, additional, Lei, Zhang, additional, Jian, Yang, additional, Li, Wang, additional, Guo-Zhen, Yang, additional, and Yu-Xiang, Weng, additional
- Published
- 2003
- Full Text
- View/download PDF
39. Gas dynamic problems caused by the generation of the radicals in a supersonic jet
- Author
-
Shi-lin, Liu, primary, Li-min, Zhang, additional, Cong-xiang, Chen, additional, Xing-xiao, Ma, additional, and Nian-lin, Zhu, additional
- Published
- 1995
- Full Text
- View/download PDF
40. Evolution on regional disparities in China from 2000 to 2012: evidence from 74 cities within three mega-urban regions along Yangtze River
- Author
-
Shi Lin Liu and Rong Sheng
- Subjects
Statistics and Probability ,Economic growth ,Inequality ,050204 development studies ,media_common.quotation_subject ,05 social sciences ,General Social Sciences ,Regression analysis ,Mega ,Population density ,Regression ,Geography ,Urbanization ,0502 economics and business ,Yangtze river ,Economic geography ,050207 economics ,China ,media_common - Abstract
This paper presents an empirical analysis of regional disparities from 2000 to 2012 based on a time series of data involving 74 cities within three mega-urban regions along Yangtze River in China. Differing from previous researches on inter-provincial and coastal/interior data, this paper provides a new perspective of mega-urban regions and their cities in China. By Coefficient of Variation and Analysis of Variance the selection of three mega-urban regions along Yangtze River reveals how the mega-urban regional disparities evolve among the east, middle and west up to date in China. In terms of general trend the mega-urban regional inequalities have been decreasing ever since the year around 2005. By traditional regression modeling this paper relates the mega-urban regional inequality and the alleviation to the urbanization and its focus on mega-urban regional development. The regression shows that the evolution of intra mega-urban regions disparities is negatively influenced by the urbanization with meaningful statistical significance from 2000 to 2012. The multilevel regression is further applied based on the nested hierarchical data structure. The results indicate a complicated relationship of the urban population density of the city level, the urbanization ratio of the mega-urban region level and the urban disparities in 2012. Finally limitations and further research advice are provided.
41. Vector Effects of Dissipative Soliton in All-Fiber MOPA System
- Author
-
Xiang-Yue Li, Shi-Lin Liu, Meng Liu, Ai-Ping Luo, Zhi-Chao Luo, and Wen-Cheng Xu
- Subjects
Dissipative vector solitons ,fiber lasers ,MOPA ,high-energy pulses. ,Applied optics. Photonics ,TA1501-1820 ,Optics. Light ,QC350-467 - Abstract
The performance of seed laser source will have a great impact on the output pulse quality of the master oscillator power amplifier (MOPA) system. Here, we report the influence of the soliton vector features on the pulse uniformity in an all-fiber MOPA configuration. We demonstrated that, although the intensity of the dissipative soliton seed source is uniform, the intensity of the output pulse train from the MOPA will show fluctuations if the soliton polarization state is not locked, i.e., polarization-rotating vector soliton. It is found that the appearance of non-uniform pulse intensity is caused by the combination of the polarization instability and the polarization dependent gain in the polarization maintaining fiber amplifier. The obtained results indicate that the polarization evolution of seed pulsed source is critical to generation of stable pulse train from the MOPA, and also might be useful to the communities dealing with solitons and high-power pulsed fiber lasers.
- Published
- 2019
- Full Text
- View/download PDF
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