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Defence Technology（防务技术） 2024年第7期37卷 1-13页

作者： guangbo xu Bingting Zha Hailu Yuan Zhen Zheng He Zhang Ministerial Key Laboratory of ZNDY Nanjing University of Science and TechnologyNanjing 210094China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing 100081China Shanghai Radio Equipment Research Institute Shanghai 201109China

The phenomenon of a target echo peak overlapping with the backscattered echo peak significantly undermines the detection range and precision of underwater laser *** overcome this issue,we propose a four-quadrant dual-beam circumferential scanning laser fuze to distinguish various interference signals and provide more real-time data for the backscatter filtering *** enhances the algorithm loading capability of the *** order to address the problem of insufficient filtering capacity in existing linear backscatter filtering algorithms,we develop a nonlinear backscattering adaptive filter based on the spline adaptive filter least mean square(SAF-LMS)*** also designed an algorithm pause module to retain the original trend of the target echo peak,improving the time discrimination accuracy and anti-interference capability of the ***,experiments are conducted with varying signal-to-noise ratios of the original underwater target echo *** experimental results show that the average signal-to-noise ratio before and after filtering can be improved by more than31 d B,with an increase of up to 76%in extreme detection distance.

关键词： Laser fuze Underwater laser detection Backscatter adaptive filter Spline least mean square algorithm Nonlinear filtering algorithm

Correlation functions of gauged linear σ-model

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Science China Mathematics 2016年第5期59卷 823-838页

作者： TIAN Gang xu guangbo Beijing International Center for Mathematical Research Peking University Department of Mathematics Princeton University Department of Mathematics University of California at Irvine

This is the second paper in a series following Tian and xu(2015), on the construction of a mathematical theory of the gauged linear σ-model(GLSM). In this paper, assuming the existence of virtual moduli cycles and th... 详细信息

关键词： gauged linear σ-model correlation function moduli space

长白山区不同产地猪苓菌核际土壤真菌多样性及其群落功能预测

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吉林农业大学学报 2024年第4期46卷 573-580页

作者：齐慧敏车欣李梦刘一儒于雪冬郑翔宇许广波延边大学农学院延吉133000

猪苓菌核际土壤微生物是构成猪苓菌核微生态系统的重要组成部分。为了深入研究长白山猪苓作为道地性药材的适生区,分析长白山区不同产地猪苓菌核际土壤的真菌多样性特征和群落组成,基于PacBio平台,利用单分子实时测序(SMRT Cell)方法对m... 详细信息

猪苓菌核际土壤微生物是构成猪苓菌核微生态系统的重要组成部分。为了深入研究长白山猪苓作为道地性药材的适生区,分析长白山区不同产地猪苓菌核际土壤的真菌多样性特征和群落组成,基于PacBio平台,利用单分子实时测序(SMRT Cell)方法对marker基因进行测序,测定长白山区不同产地猪苓菌核际土壤真菌群落结构。结果表明:所测样本共获得390 OTU,注释的真菌隶属于24纲53目97科168属。不同产地的猪苓菌核际土壤中基于门水平上子囊菌门是主要的优势菌门,基于属水平上被孢霉属为多数土壤样品的优势真菌属。土壤的理化因子对8个土样中真菌群落多样性的影响大小顺序为TP>TK>TN>pH。长白山区不同产地猪苓菌核际土壤的优势真菌群落功能存在明显差异,主要以外生菌根为主。

关键词：长白山区猪苓土壤真菌多样性群落功能

A Wall-Crossing Formula and the Invariance of GLSM Correlation Functions

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Peking Mathematical Journal 2020年第2期3卷 235-291页

作者： Gang Tian guangbo xu SMS and BICMR Peking UniversityBeijingChina Department of Mathematics Texas A&M UniversityCollege StationTX 77843USA

In this paper,we prove a wall-crossing formula,a crucial ingredient needed to prove that the correlation function of gauged linear-model is independent of the choice of perturbations.

关键词： Gauged linear sigma model(GLSM) Wall-crossing Virtual cycle

Ecological Characteristics of Soil Grown with Tricholoma Matsutake

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Pedosphere 1997年第4期7卷 355-360页

作者： xu guangbo FU WEIJIE WEI TIEZHENG LI GUIHUA LIANG YUNJIANG QUAN MINGDAO and YANG SHURONG(Yianbian Agricultural College, Longjing, Jinn 133400 (China)) Vtanandian Agricultural College Longjing Jilin 133400 China

A 5-year study on the soil ecological environment of matsutake (Trihcholoma Matsutake) growing areas near Changbai Mountains showed that several factors, such as climate, parent material, organism and landform, which form the soil ecosystem provided suitable ecological environment for the formation and growth of matsutake. How to improve the construction and function of the soil ecosystem in order to utilize the natural resource continuously was also studied.

关键词： ecological characteristics ecosystem matsutake soil

Great Promise for Coal-derived Gas Exploration in China

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China Oil & Gas 2010年第2期17卷 21-25页

作者： Zheng Dewen, Zhang Guangwu Yang Wei Sun guangbo xu Xiaolin Research Institute of Petroleum Exploration and Development-Langfang

With the introduction, development and application of coal-derived gas geological theory, China’s coal-derived gas exploration has witnessed a rapid development, and the theory gave an enormous impetus to robust grow... 详细信息

关键词：煤成气中国勘探天然气储量地质理论年代

Research Progress on Artificial Cultivation of Trhicoloma Matsutake and Theory of the Shiro in Changbai Mountains

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Science Foundation in China 2006年第2期14卷 48-51页

作者： guangbo xu Tiezheng Wei Weijie Fu Minjie Fu Yunjiang Liang Agriculture college Yanbian University Longjing Jilin 133400 Systematic mycology and Lichenology Laboratory Institute of Microbiology Chinese Academy of Sciences Beiing 100080

Study on artificial cultivation of Tricholoma matsutake carried through by the present research group in Changbai Mountains in recent years was briefly reviewed in the paper, and then, the signifycance of cultivation.... 详细信息

关键词： tricholoma matsutake artificial breeding artificial environment artificial cultivation

Effects of Biogas Slurry Recirculation on Anaerobic Digestion Performance of Maize Straw Silage

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Asian Agricultural Research 2018年第12期10卷 49-51,54页

作者： Xinhe LIU Nan LI Mengya YANG Benyue ZHANG guangbo xu Renzhe PIAO Hongyan ZHAO College of Agronomy Yanbian University

In order to investigate the effects of slurry recirculation technology on anaerobic digestion performance of maize straw silage,maize straw silage was fermented with recirculated biogas slurry,and the gas production,p H value,methane content,volatile organic acids( VFAs)contents,chemical oxygen demand( COD) removal rate and other indicators were studied. The results showed that the fermentation time was positively correlated with daily gas production,methane content,cumulative gas production,VFAs and COD removal rate. Although the p H value fluctuated,it was still in the normal reaction range. The daily gas production was about 1. 26 L. The acetic acid content increased first,then decreased,then increased,and finally stabilized. The biogas slurry recirculation technology saves water resources by 40 m L/d without affecting the normal gas production of anaerobic fermentation,and reduces the consumption of environmental resources. It has important development significance for the sustainable use of biomass resources.

关键词： Biogas slurry recirculation Maize straw silage Anaerobic digestion performance Biomass resources

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小开口级联同步扫描水下激光引信设计与建模

兵工学报 2022年第12期43卷 3162-3171页

作者：徐光博查冰婷郑震张合南京理工大学智能弹药技术国防重点学科实验室江苏南京210094

针对目前大开口水下同步扫描激光引信存在空间利用率低和扇形盲区的问题,提出一种小开口、5组扫描单元级联的设计方案,以实现透光窗口的小型化,提高水下激光引信的整体强度和空间利用率。针对该方案采用同步扫描多参数优化设计方法,得... 详细信息

针对目前大开口水下同步扫描激光引信存在空间利用率低和扇形盲区的问题,提出一种小开口、5组扫描单元级联的设计方案,以实现透光窗口的小型化,提高水下激光引信的整体强度和空间利用率。针对该方案采用同步扫描多参数优化设计方法,得到小开口激光引信的最佳扫描频率、最佳脉冲频率与各扫描单元的通光时间。建立弹目在不同交会姿态下的回波能量分布模型,获得最小回波能量及其对应的弹目交会姿态。对典型弹目交会状态进行了计算模拟仿真。仿真结果表明:所提方案在提升可利用空间、解决扇形盲区的同时,满足了弹目在各种交会姿态下的探测需求,为水下同步扫描激光引信的设计提供了参考。

关键词：激光引信小开口级联同步扫描多参数优化双向反射分布函数

基于MCMC方法优化的港口交通系统风险仿真

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上海海事大学学报 2013年第2期34卷 13-16页

作者：徐广波胡甚平上海海事大学商船学院上海201306 江阴海事局江苏江阴214431

为获得较为准确的港口交通系统风险分布,提高港口风险管理能力,在港口交通风险定量化评估的基础上,得出交通事故率和事故后果的贝叶斯概率统计,构建基于马尔可夫链蒙特卡罗(Markov Chain Monte Carlo,MCMC)方法的港口交通系统风险仿真模... 详细信息

为获得较为准确的港口交通系统风险分布,提高港口风险管理能力,在港口交通风险定量化评估的基础上,得出交通事故率和事故后果的贝叶斯概率统计,构建基于马尔可夫链蒙特卡罗(Markov Chain Monte Carlo,MCMC)方法的港口交通系统风险仿真模型.利用WinBUGS软件,通过MCMC方法对该模型进行参数推断和优化;并在此基础上对港口交通系统风险进行仿真实验,得出风险度分布曲线.实例表明,优化后的仿真模型能更好地反映港口交通系统风险的趋势,为港口安全管理决策提供支持.

关键词：港口交通系统风险蒙特卡罗仿真马尔可夫链