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东濮凹陷西南洼沙二下砂泥岩薄互层地震描述技术

IEEE/CAA Journal of Automatica Sinica 2023年第9期

作者： Yuanqi Qin Wen Hua Junchen Jin Jun Ge Xingyuan Dai lingxi li Xiao Wang Fei-Yue Wang

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断块油气田 2021年第4期28卷 493-497页

作者：李令喜苏云唐娟肖曾金刘欣欣马识途窦安迪中国石化中原油田分公司油气勘探管理部河南濮阳457001 中国石化中原油田分公司物探研究院河南濮阳457001

东濮凹陷是一个典型的陆相盐湖断陷盆地,砂泥岩薄互层是常见的沉积叠加样式,同时西南洼地区沙二下储层以浅水三角洲沉积体系为主,单层砂体薄,岩性横向变化快,且受到复杂断裂影响,储层边界刻画不清。为此,提出了一种基于地震相控储层反... 详细信息

东濮凹陷是一个典型的陆相盐湖断陷盆地,砂泥岩薄互层是常见的沉积叠加样式,同时西南洼地区沙二下储层以浅水三角洲沉积体系为主,单层砂体薄,岩性横向变化快,且受到复杂断裂影响,储层边界刻画不清。为此,提出了一种基于地震相控储层反演技术流程:首先,通过精细岩性标定及井震统计分析,优选反映砂岩厚度的敏感地震属性;然后,运用多属性融合技术刻画地震相,并以地震相进行约束,建立反演低频模型,开展叠后反演;最后,通过坐标旋转与叠前反演技术相结合,实现储层的精细预测。应用结果表明,该技术流程能够有效解决薄储层砂体边界刻画不清以及垂向识别能力不足的问题,可为东部其他区域砂泥岩薄互层地震识别提供借鉴。

关键词：砂泥岩薄互层地震描述技术地震属性地震相储层边界坐标旋转地震反演东濮凹陷西南洼

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玄参“发汗”新工艺研究

亚太传统医药 2024年第9期20卷 55-60页

作者：李翎熙刘朝晖邹欢李漓吴飞燕柏莉周小江湖南中医药大学湖南长沙410208 恒修堂药业有限公司湖南长沙410000

目的:筛选出高效且可控的玄参梯度升温“发汗”新工艺。方法:采用单因素试验、正交试验的方法,结合直观分析和方差分析筛选出玄参最优“发汗”工艺条件。结果:玄参“发汗”新工艺的条件为30℃干燥6天后,40℃干燥3天,最后50℃干燥2天。结... 详细信息

目的:筛选出高效且可控的玄参梯度升温“发汗”新工艺。方法:采用单因素试验、正交试验的方法,结合直观分析和方差分析筛选出玄参最优“发汗”工艺条件。结果:玄参“发汗”新工艺的条件为30℃干燥6天后,40℃干燥3天,最后50℃干燥2天。结论:玄参梯度升温“发汗”新工艺具有保持玄参断面黑色均匀、缩短“发汗”周期、发汗过程可控的优点,为玄参产地“发汗”加工提供了一种新方法,为其他药材“发汗”方法改良研究提供了一种新模式。

关键词：玄参发汗新工艺产地加工

虚实系统互驱的混合增强智能开放创新平台的架构与方案

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智能科学与技术学报 2019年第4期1卷 379-391页

作者：张俊李灵犀林懿伦张天韵张科许沛东阮克羽沈聃武汉大学电气与自动化学院湖北武汉430072 印第安纳大学-普渡大学印第安纳波利斯分校电子与计算机工程系美国印第安纳波利斯IN 46202 中国科学院自动化研究所北京100190 普渡大学西拉法叶分校电气和计算机工程学院美国印第安纳波利斯IN 46202

首先提出了混合增强智能开放创新平台建设的总体目标以及面临的问题,提出了一种虚实系统互驱的平台架构方案。然后阐述了平台的基本形态,并详述了平台各层的模块机理和作用,以及涉及的关键技术,如人机交互技术、数据处理技术和数字虚拟... 详细信息

首先提出了混合增强智能开放创新平台建设的总体目标以及面临的问题,提出了一种虚实系统互驱的平台架构方案。然后阐述了平台的基本形态,并详述了平台各层的模块机理和作用,以及涉及的关键技术,如人机交互技术、数据处理技术和数字虚拟工业技术。最后设计了开放创新的保障和激励机制,并探讨了区块链技术在混合增强智能开放创新平台数据安全方面的应用。

关键词：混合增强智能开放创新平台虚实系统人机交互数字虚拟工业技术

DC Traction Power Supply System Based on Modular Multilevel Converter Suitable for Energy Feeding and De-icing

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 649-659页

作者： lingxi Hou Shuqing Zhang Yingdong Wei Xiaoqian li Qirong Jiang Mingrui li Weirui li Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

A novel DC traction power supply system suitable for energy feeding and de-icing is proposed in this paper for an urban rail transit catenary on the basis of the full bridge submodule (FBSM) modular multilevel converter (MMC). The FBSM-MMC is a novel type of voltage source converter (VSC) and can directly control the output DC voltage and conduct bipolar currents, thus flexibly controlling the power flow of the urban rail transit catenary. The proposed topology can overcome the inherent disadvantages of the output voltage drop in the diode rectifier units, increase the power supply distance and reduce the number of traction substations. The flexible DC technology can coordinate multiple FBSM-MMCs in a wide area and jointly complete the bidirectional control of catenary power flow during the operation of the electric locomotive, so as to realize the local consumption and optimal utilization of the recovered braking energy of the train. In addition, the FBSM-MMCs can also adjust the output current when the locomotive is out of service to prevent the catenary from icing in winter. The working modes of the proposed topology are illustrated in detail and the control strategy is specially designed for normal locomotive operations and catenary de-icing. Simulation cases conducted by PSCAD/EMTDC validate the proposed topology and its control strategy.

关键词： DC traction power supply system de-icing for catenary energy feeding modular multilevel converter based on full-bridge submodules(FBSM-MMC) urban rail transit

Random change point model with an application to the China Household Finance Survey

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Science China Mathematics 2024年第10期67卷 2373-2386页

作者： Meng li lingxi Gao Guangming Lv Xingwei Tong School of Statistics Beijing Normal UniversityBeijing 100875China

We consider a linear model with a change point according to the unknown random threshold of a covariate. We give the expectation-maximization(EM) estimations of the regression and change point parameters. The existence of the random change point is detected by the supremum(SUP) test of score statistics. Theoretically, we establish the convergence and asymptotic distribution of the estimation and show that the EM estimates converge in distribution to a normal distribution. In addition, the numerical performance of the proposed approach is demonstrated through simulation studies. Finally, applying our methodology to household financial decisions, we see that the average debt tolerance of Chinese households is estimated to be 1.1364 times the sum of total household income and financial assets. The effect of assets and income on consumption shows a rapid decline if the household exceeds the average debt tolerance.

关键词： random change point EM algorithm SUP test debt nancial vulnerability

Insight Into the Separation-of-Variable Methods for the Closed-Form Solutions of Free Vibration of Rectangular Thin Plates

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 329-355页

作者： Yufeng Xing Ye Yuan Gen li Institute of Solid Mechanics Beihang University(BUAA)Beijing100191China

The separation-of-variable(SOV)methods,such as the improved SOV method,the variational SOV method,and the extended SOV method,have been proposed by the present authors and coworkers to obtain the closed-form analytical solutions for free vibration and eigenbuckling of rectangular plates and circular cylindrical *** taking the free vibration of rectangular thin plates as an example,this work presents the theoretical framework of the SOV methods in an instructive way,and the bisection–based solution procedures for a group of nonlinear eigenvalue ***,the explicit equations of nodal lines of the SOV methods are presented,and the relations of nodal line patterns and frequency orders are *** is concluded that the highly accurate SOV methods have the same accuracy for all frequencies,the mode shapes about repeated frequencies can also be precisely captured,and the SOV methods do not have the problem of missing roots as well.

关键词： Separation-of-variable method Rayleigh quotient nodal line eigenvalue equation bisection method

The ChatGPT After: Building Knowledge Factories for Knowledge Workers with Knowledge Automation

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Local magnetic moment oscillation around an Anderson impurity on graphene

IEEE/CAA Journal of Automatica Sinica 2023年第11期

作者： By Yutong Wang Member IEEE Xiao Wang Senior Member Xingxia Wang Jing Yang Oliver Kwan lingxi li Fei-Yue Wang Fellow

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 192-201页

作者： Shuai li Zhen Ma Jin-Hua Gao School of Science Hebei University of Science and Technology School of Electronics and Information Zhengzhou University of Light Industry School of Physics and Wuhan National High Magnetic Field Center Huazhong University of Science and Technology

We theoretically investigate the spin resolved Friedel oscillation （FO） and quasiparticle interference （QPI） in graphene induced by an Anderson *** the impurity becomes magnetic,the resulted FO becomes spin dependent,which gives rise to a local magnetic moment oscillation with an envelop decaying as r-2in real space in the doping ***,at half filling,the electron density and local magnetic moment will not oscillate but decay as *** spin resolved FO has both sublattice and spin ***,the local magnetic moment decay at half filling only occurs at one sublattice of graphene,which is quite like the phenomenon observed in the STM experiment (***ález-Herrero et al.,Science 352,437 （2016）).We further give an analytic formula about such spin dependent FO based on the stationary phase ***,we study the interference of quasiparticles around the magnetic impurity by calculating the spin dependent Fourier-transformed local density of states （FT-LDOS）.Our work gives a comprehensive understanding about the local magnetic moment oscillation around an Anderson impurity on graphene.

关键词： Friedel oscillation local magnetic moment graphene Anderson impurity

海上油田防腐潜油电泵耐CO_2腐蚀性能试验研究

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石油矿场机械 2015年第6期44卷 55-59页

作者：李令喜高强梁凤儒黄新春付军中海油能源发展股份有限公司工程技术分公司天津300452

我国海上油田潜油电泵腐蚀源以CO2为主,防腐潜油电泵机组选用的防CO2腐蚀材料有几种,但国内各潜油电泵厂家都没有对该材料进行耐腐蚀性能试验。选取几种常用的防CO2腐蚀材料,模拟海上油田的CO2腐蚀环境,试验研究每种材料的耐CO2腐蚀性能... 详细信息

我国海上油田潜油电泵腐蚀源以CO2为主,防腐潜油电泵机组选用的防CO2腐蚀材料有几种,但国内各潜油电泵厂家都没有对该材料进行耐腐蚀性能试验。选取几种常用的防CO2腐蚀材料,模拟海上油田的CO2腐蚀环境,试验研究每种材料的耐CO2腐蚀性能,并验证使用防腐材料的潜油电泵能否达到质保要求。

关键词：海上油田潜油电泵 CO2 腐蚀耐腐蚀性能