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| 1 | Research on effectiveness of coal mine safety supervision system reform on three types of collieries in China显示文摘Coal mine safety supervision system plays an important role in the coal mine safety management in China.However,the current supervision system is established on the basis of learning the advanced experience from other developed countries.It needs to be further improved according to national conditions.Therefore,the effectiveness of coal mine safety supervision system reform on three types of collieries are assessed by using time series analysis method based on comparative analysis of the supervision system before and after the reform in this paper.The regression results show that the structural reform is not conductive to the improvement of coal mine safety situation in the short term,but conductive significantly in the long term.Specifically,the effects in township coal mines are more significant than stateowned key coal mines in the long run,but negative effects also exist in the short term.The negative effects in state-owned key coal mines are non-significant compared with township coal mines.Moreover,the regression results are analyzed from the aspects of the closure policy of illegal small township coal mines at the end of 1998 and shortage of the new supervision system.Finally,the suggestions on improving the new supervision system are put forward based on the above analysis. | Quanlong Liu Xinchun Li Fuyuan Guan | 2014 | International Journal of Coal Science & Technology2014，1，3： | 7 |
| 2 | Winter wheat mapping using a random forest classifier combined with multi-temporal and multi-sensor data显示文摘Wheat is a major staple food crop in China.Accurate and cost-effective wheat mapping is exceedingly critical for food production management,food security warnings,and food trade policy-making in China.To reduce confusion between wheat and non-wheat crops for accurate growth stage wheat mapping,we present a novel approach that combines a random forest(RF)classifier with multi-sensor and multi-temporal image data.This study aims to(1)determine whether an RF combined with multi-sensor and multi-temporal imagery can achieve accurate winter wheat mapping,(2)to find out whether the proposed approach can provide improved performance over the traditional classifiers,and(3)examine the feasibility of deriving reliable estimates of winter wheat-growing areas from medium-resolution remotely sensed data.Winter wheat mapping experiments were conducted in Boxing County.The experimental results suggest that the proposed method can achieve good performance,with an overall accuracy of 92.9%and a kappa coefficient(κ)of 0.858.The winter wheat acreage was estimated at 33,895.71 ha with a relative error of only 9.3%.The effectiveness and feasibility of the proposed approach has been evaluated through comparison with other image classification methods.We conclude that the proposed approach can provide accurate delineation of winter wheat areas. | Jiantao Liu Quanlong Feng Jianhua Gong Jieping Zhou Jianming Liang Yi Li | 2018 | International Journal of Digital Earth2018，11，8： | 3 |
| 3 | Mapping Microscale Strain Fields Around a Crack Tip in Molybdenum Via Geometric Phase Analysis and Digital Image Correlation显示文摘Uniaxial tension tests were conducted on single-edge-notched tensile specimens of pure molybdenum with a mesh grid pattern in front of the notch. A series of images of crack initialization and propagation with a distorted mesh grid pattern were obtained by means of in situ scanning electron microscopy. Strain fields around the crack tip were mapped successively using geometric phase analysis and digital image correlation techniques, and then compared with the predictions obtained through linear elastic fracture mechanics(LEFM). The comparison shows that the measured strain distribution ahead of the crack tip is consistent with the LEFM predictions of up to 25 μm from the crack tip. | Chunwang Zhao Wencai Li Jijun Li Yongxiang Li Quanlong Liu Lifu Wang Qingyu Hou Yongming Xing | 2018 | Acta Mechanica Solida Sinica2018，31，3： | 3 |
| 4 | Chromatin-bound NLS proteins recruit membrane vesicles and nucleoporins for nuclear envelope assembly via importin-α/β显示文摘 | Quanlong Lu Zhigang Lu Qinying Liu Li Guo He Ren Jingyan Fu Qing Jiang Paul R Clarke Chuanmao Zhang | 2012 | Cell Research2012，22，11： | 2 |
| 5 | Urban flood mapping based on unmanned aerial vehicle remote sensing and random forest classifier--a case of Yuyao, China 显示文摘 | FENG Quanlong LIU Jiantao | 2015 | Water2015，，7： | 1 |
| 6 | Urban flood mapping based on unmanned aerial vehicle remote sensing and random forest classifier--a case of Yuyao, China 显示文摘 | FENG Quanlong LIU Jiantao | 2015 | Water2015，，7： | 1 |
| 7 | Evolutionary game analysis and stability control scenarios of coal mine safety inspection system in China based on system dynamics显示文摘 | LIU Quanlong LI Xinchun MAUREEN H | 2015 | Safety Science2015，80，： | 1 |
| 8 | Moiré-driven electromagnetic responses and magic angles in a sandwiched hyperbolic metasurface显示文摘Recent moiréconfigurations provide a new platform for tunable and sensitive photonic responses,as their enhanced light–matter interactions originate from the relative displacement or rotation angle in a stacking bilayer or multilayer periodic array.However,previous findings are mostly focused on atomically thin condensed matter,with limitations on the fabrication of multilayer structures and the control of rotation angles.Structured microwave moiréconfigurations are still difficult to realize.Here,we design a novel moiréstructure,which presents unprecedented capability in the manipulation of light–matter interactions.Based on the effective medium theory and S-parameter retrieval process,the rotation matrix is introduced into the dispersion relation to analyze the underlying physical mechanism,where the permittivity tensor transforms from a diagonal matrix to a fully populated one,whereas the permeability tensor evolves from a unit matrix to a diagonal one and finally becomes fully filled,so that the electromagnetic responses change drastically as a result of stacking and rotation.Besides,the experiment and simulation results reveal hybridization of eigenmodes,drastic manipulation of surface states,and magic angle properties by controlling the mutual rotation angles between two isolated layers.Here,not only a more precisely controllable bilayer hyperbolic metasurface is introduced to moiréphysics,the findings also open up a new avenue to realize flat bands at arbitrary frequencies,which shows great potential in active engineering of surface waves and designing multifunctional plasmonic devices. | YI LIU CHUNMEI OUYANG QUAN XU XIAOQIANG SU QUANLONG YANG JIAJUN MA YANFENG LI ZHEN TIAN JIANQIANG GU LIYUAN LIU JIAGUANG HAN YUNLONG SHI WEILI ZHANG | 2022 | Photonics Research2022，10，9： | 0 |
| 9 | A Construction Method of Online Course Portrait Based on Feature Engineering显示文摘With the emergence of massive online courses,how to evaluate the quality of courses with different qualities to improve the discrimination between courses and recommend personalized online course learning resources for learners needs to be evaluated from all aspects.In this paper,a method of constructing an online course portrait based on feature engineering is proposed.Firstly,the framework of online course portrait is established,the related features of the portrait are extracted by feature engineering method,and then the indicator weights of the portrait are calculated by entropy weight method.Finally,experiments are designed to evaluate the performance of the algorithms,and an example of the course portrait is given. | Wuying Liu Quanlong Li Yuanlong Chen | 2021 | 计算机教育2021，，12： | 0 |
| 10 | Topology-empowered membrane devices for terahertz photonics显示文摘Control of terahertz waves offers a profound platform for next-generation sensing,imaging,and information communications.However,all conventional terahertz components and systems suffer from bulky design,sensitivity to imperfections,and transmission loss.We propose and experimentally demonstrate onchip integration and miniaturization of topological devices,which may address many existing drawbacks of the terahertz technology.We design and fabricate topological devices based on valley-Hall photonic structures that can be employed for various integrated components of on-chip terahertz systems.We demonstrate valleylocked asymmetric energy flow and mode conversion with topological waveguide,multiport couplers,wave division,and whispering gallery mode resonators.Our devices are based on topological membrane metasurfaces,which are of great importance for developing on-chip photonics and bring many features into terahertz technology. | Quanlong Yang Dongyang Wang Sergey Kruk Mingkai Liu Ivan Kravchenko Jiaguang Han Yuri Kivshar Ilya Shadrivov | 2022 | Advanced Photonics2022，4，4： | 0 |
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