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Properties of Flare Events on M Stars from LAMOST Spectral Survey Based on Kepler and TESS Light Curves

Research in Astronomy and Astrophysics 2023年第5期23卷 1-18页

作者： Gang Meng Li-Yun Zhang Tianhao Su Zilu Yang xianming lhan Prabhakar Misra Liu Long Qingfeng Pi Zhongzhong Zhu Linyan Jiang College of Physics&Guizhou Provincial Key Laboratory of Public Big Data Guizhou UniversityGuiyang 550025China Department of Astronomy Beijing Normal UniversityBeijing 100875China Dept.of Physics and Astronomy Butler UniversityIndianapolisIN 46208USA Department of Physics&Astronomy Howard University WashingtonDC 20059USA College of Medicine Guizhou University of Traditional Chinese MedicineGuiyang 550025China Guiyang Institute of Information Science and Technology Guiyang 550025China

A catalog of M stars has been published from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope data release 7(LAMOST DR7).We cross-matched the LAMOST M catalog with Kepler,Kepler 2(K2)and Transiting Exoplanet Survey Satellite(TESS)*** obtained the light curves from the Kepler and TESS *** detected 20,047 flare events from 4053 M stars and calculated their durations,amplitudes,and *** analyzed the distribution of the flare durations and *** distributions of flare duration for Kepler,K2 and TESS peak are at 3–3.5 hr,4–6 hr and 1–1.5 hr,*** may be the result of the different cadences for the three data *** highest regions of the flare energies of Kepler,K2 and TESS are 32–32.5,32–32.5 and31–31.5 erg in Log format,respectively.A linear relationship between flare duration and energy emerges from our *** ratio of flare duration to total observational time is approximately 0.2%–0.3%for the Kepler,K2 and TESS *** occurrence rate of a star with a flare event increases from the M0 to M4 *** also determined the spatial distribution of the flare rate of M stars in the Milky *** seems that the flare rate decreases as the vertical height *** power index of the flare energies is in the region of 1.53–2.32,which is similar to previous result for solar type star(2.0).Further,we examined the relationship between the flare amplitude and chromospheric *** flare activity increases rapidly with the increase in the HαEW at the lower values(less approximately 2?)and it increases slowly at the higher values.

关键词： stars activity-stars flare-stars low-mass

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Enhancing anion conductivity in a highly alkali-stable eta topologic Cu(Ⅰ) framework via strong electrostatic repulsion

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Science China Chemistry 2025年

作者： Xiaolu Wang Shaohui Guo Chao Suo Fuqiang Zhang Junhao Wang Wenjing Wang Daqiang Yuan Linfeng Liang xianming Zhang College of Chemistry Taiyuan University of Technology Institute of Crystalline Materials Shanxi University School of Chemistry and Materials Science Shanxi Normal University State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences

Metal-organic frameworks （MOFs） based on anion exchange membranes （AEMs） have garnered considerable interest,particularly for their potential to enhance ion conductivity by pre-introducing anions into *** approach is recognized as straightforward and effective for improving ion ***,developing high-performance AEMs is limited by the inherent instability and low resistance of *** study presents a novel 1,3,5-triazineμ3-bridged neutral Cu（I） framework,designated SXU-120 （where SXU represents Shanxi University）.This framework is synthesized using melamine,a widely available industrial product,as the starting material,achieving a high space-time yield exceeding 1.1 kg *** organic ligands and metal ions in SXU-120 are 3-connected,forming a rare eta topology with the point symbol 8～***-120 exhibits exceptional stability,even in a 10 M KOH solution,due to its high density of uncoordinated–NH2and carbonyl ***,the framework’s unique one-dimensional channels,characterized by their electronegativity,interact electrostatically with OH-ions,thereby accelerating OH-ion transfer along these ***,the OH-conductivity of this material reaches an impressive 0.49 S cm-1at 90°C under full humidity for 100 h,representing the highest OH-conductivity reported for MOF-based conductors to *** properties make SXU-120 a promising candidate for efficient AEM materials in next-generation industrial applications.

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Experimental and modeling studies on installation of arc sprayed Zn anodes for protection of reinforced concrete structures

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Frontiers of Structural and Civil Engineering 2016年第1期10卷 1-11页

作者： xianming SHI School of Civil Engineering and Architecture Wuhan Polytechnic University Wuhan 430023 China Department of Civil & Environmental Engineering Washington State University P.O. Box 642910 Pullman WA 99164-2910 USA

Arc sprayed zinc （Zn） anode on concrete surfaces has been an emerging technology for protecting reinforced concrete structures from rebar corrosion in coastal environments. Many cathodic protection （CP） systems with arc sprayed Zn anodes will reach or exceed their design life in the near future and thus may function improperly or insufficiently, making it necessary to replace the aged anodes. However, prior to this study, little was known about the most effective profile for the concrete surface, for either new concrete or old concrete with existing Zn anodes removed. This work develops criteria to properly prepare the concrete surface before the application of new Zn anode. Experimental studies were conducted both in the laboratory and for a field structure in Oregon. Artificial neural network was used to achieve better understanding of the complex cause-and-effect relationships inherent in the Zn-mortar or Zn-concrete systems and was successful in finding meaningful, logical results from the bond strength data. The goal is to achieve strong initial bond strength of new Zn to concrete, which is essential for long-term performance of the CP system. The results from this case study suggest that it is necessary to adjust the anode removal and surface sandblasting based on the electrochemical age of the existing concrete. In all cases of sandblasting, minimize the exposure of large aggregates （e.g., those bigger than 19 mm in diameter）.

关键词： arc sprayed Zn anode replacement reinforced concrete bridge preservation neural networks surface profile

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Enhanced multi-baseline unscented Kalman filtering phase unwrapping algorithm

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Journal of Systems Engineering and Electronics 2016年第2期27卷 343-351页

作者： xianming Xie School of Information and Communication Guilin University of Electronic Technology

This paper presents an enhanced multi-baseline phase unwrapping algorithm by combining an unscented Kalman filter with an enhanced joint phase gradient estimator based on the amended matrix pencil model, and an optimal path-following strategy based on phase quality estimate function. The enhanced joint phase gradient estimator can accurately and effectively extract the phase gradient information of wrapped pixels from noisy interferograms, which greatly increases the performances of the proposed method. The optimal path-following strategy ensures that the proposed algorithm simultaneously performs noise suppression and phase unwrapping along the pixels with high-reliance to the pixels with low-reliance. Accordingly, the proposed algorithm can be predicted to obtain better results, with respect to some other algorithms, as will be demonstrated by the results obtained from synthetic data.

关键词： multi-baseline phase unwrapping enhanced joint phase gradient estimator unscented Kalman filter

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Multi-baseline phase unwrapping algorithm for INSAR

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Journal of Systems Engineering and Electronics 2013年第3期24卷 417-425页

作者： xianming Xie School of Information and Communication Guilin University of Electronic Technology

A novel multi-baseline phase unwrapping algorithm based on the unscented particle filter for interferometric synthetic aperture radar （INSAR） technology application is proposed. The proposed method is not constrained by the nonlinearity of the problem and is independent of noise statistics, and performs noise eliminating and phase unwrapping at the same time by combining with an unscented particle filter with a path-following strategy and an omni-directional local phase slope estimator. Results obtained from multi-baseline synthetic data and single-baseline real data show the performance of the proposed method.

关键词： interferometric aperture radar (INSAR) phase un- wrapping unscented particle filter.

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Experimental demonstration of D-band signals wireless transmission over 30 km

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Science China Technological Sciences 2025年

作者： Yi WEI Xiongwei YANG Jianjun YU xianming ZHAO Mingxu WANG Jingwen TAN Weiping LI Feng ZHAO Chengzhen BIAN Hansong MA Qinyi ZHANG Qiutong ZHANG Bing ZHANG Wen ZHOU Kaihui WANG Sicong XU Jianguo YU State Key Laboratory of ASIC and System Key Laboratory for Information Science of Electromagnetic Waves (MoE)and School of Information Science and Technology Fudan University Harbin Institute of Technology School of Automation Xi'an University of Posts and Telecommunications School of Electronic Engineering Beijing University of Posts and Telecommunications

Due to the rise of innovative technologies like artificial intelligence(AI),the Internet of Things(IoT), and telemedicine, the demand for internet traffic is rapidly increasing. In order to achieve ultra-high-speed wireless communication, many researchers are directing their efforts towards the Dband. The D-band, spanning the frequency band 110–170 GHz, has abundant spectrum resources and license-free characteristics [1,2].

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Phase noise filtering and phase unwrapping method based on unscented Kalman filter

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Journal of Systems Engineering and Electronics 2011年第3期22卷 365-372页

作者： xianming Xie Yiming Pi School of Electronic Engineering University of Electronic Science and Technology of ChinaChengdu 611731P.R.China

This paper presents a new phase unwrapping algorithm based on the unscented Kalman filter（UKF） for synthetic aperture radar（SAR） *** method is the result of combining an UKF with path-following strategy and an omni-directional local phase slope *** technique performs simultaneously noise filtering and phase unwrapping along the high-quality region to the low-quality region,which is also able to avoid going directly through the noisy *** addition,phase slope is estimated directly from the sample frequency spectrum of the complex interferogram,by which the underestimation of phase slope is *** and real data processing results validate the effectiveness of the proposed method,and show a significant improvement with respect to the extended Kalman filtering（EKF） algorithm and some conventional phase unwrapping algorithms in some situations.

关键词： phase unwrapping unscented Kalman filter(UKF) path-following strategy.

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Multi-baseline extended particle filtering phase unwrapping algorithm based on amended matrix pencil model and quantized path-following strategy

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Journal of Systems Engineering and Electronics 2019年第1期30卷 78-84页

作者： XIE xianming ZENG Qingning School of Information and Communication Guilin University of Electronic Technology

This paper proposes a new multi-baseline extended particle filtering phase unwrapping algorithm which combines an extended particle filter with an amended matrix pencil model and a quantized path-following strategy. The contributions to multibaseline synthetic aperture radar(SAR) interferometry are as follows: a new recursive multi-baseline phase unwrapping model based on an extended particle filter is built, and the amended matrix pencil model is used to acquire phase gradient information with a higher precision and lower computational cost, and the quantized path-following strategy is introduced to guide the proposed phase unwrapping procedure to efficiently unwrap wrapped phase image along the paths routed by a phase derivative variance map.

关键词： multi-baseline phase unwrapping interferometric synthetic aperture radar (InSAR) extended particle filter.

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Limiting weak-type behaviors for Riesz transforms and maximal operators in Bessel setting

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Frontiers of Mathematics in China 2019年第3期14卷 535-550页

作者： xianming HOU Huoxiong WU School of Mathematics and Statistics Linyi University Linyi 276005 China School of Mathematical Sciences Xiamen University Xiamen 361005 China

We establish the limiting weak type behaviors of Riesz transforms associated to the Bessel operators on IR+. which are closely related to the best constants of the weak type (1,1) estimates for such operators. Meanwhile, the corresponding results for Hardy-Littlewood maximal operator and fractional maximal operator in Bessel setting are also obtained.

关键词： Limiting weak-type behaviors Bessel operators Riesz transforms maximal operators

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Novel method for separation and screening of lubricant-degrading microorganisms and bacterial biodegradation

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Chinese Journal of Chemical Engineering 2016年第3期24卷 353-359页

作者： Yan Jiang Hui Qi xianming Zhang Engineering Research Centre for Waste Oil Recovery Technology and Equipment Ministry EducationChongqing Technology and Business University College of Foreign Languages Chongqing Technology and Business University

With the rapid increase of lubricant consumption, oil contamination becomes more serious. Biotreatment is an important method to remove oil contamination with some advantages. In this study, acclimatized oil- contaminated soil and used lubricating oil were sampled to isolate lubricant-degrading strains by several methods. 51 isolates were obtained and 24-well plates were employed to assess bacterial potential in high- throughput screening. The method was noted for the prominence of oil-water two-phase system with saving chemicals, shortening cycles and lessening workloads. In order to decrease inaccuracy, subculture and resting cells were inoculated into mineral salt medium with 200 μ1 oil in well plates for the cultivation at 37 ℃ for 5 and 7 days, and the biodegradation potential was characterized by the changes of oil film and cell density. With appropriate evaluation by shaking flask tests, 5 isolates were retained for their potentials with the maxi- mum biodegradation from 1500 to 2200 mg· L-1 and identified as Acidovorax dtrulli, Pseudomonos balearica, Adnetobacterjohnsonii （two isolates with different biodegradation potentials） and Addovorax avenae using 16S rRNA sequencing analysis. Also, lipase activity was determined using indicator titration and p-nitrophenyl palmitate （p-NPP） methods. The results indicated that only p-NPP was successful to test lipase activity with the range of 1.93-6.29 mg· L-1 Although these five strains could degrade 1000 mg· L-1 lubricating oil in 158-168 h, there existed distinct difference in enzyme activity, which demonstrates that lipase activity could not be used as the criterion to evaluate microbial biodegradation potential for petroleum hydrocarbons.

关键词： Lubricant Degradation Separation 24-well plate Enzyme

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