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Application of wavelet to strength log from scratch test

Journal of Rock Mechanics and Geotechnical Engineering 2023年第5期15卷 1161-1170页

作者： He Zhang Jia-liang le Emmanuel Detournay Department of Civil Environmental and Geo-EngineeringUniversity of MinnesotaMinneapolisMN55455USA

This paper proposes a methodology to construct logs of rock strength from the cutting force signal recorded in scratch tests conducted in the ductile *** approach,which is based on the application of discrete wavelet transforms,recognizes the existence of two length scales[c and[*** strength length scale[c represents the length over which it is meaningful to measure strength,while the repeatability length scale[r is related to the resolution at which the force signal must be observed to become insensitive to the stochastic micro-failure events triggered by the motion of the *** is postulated that the original cutting force signal,assumed to be sampled at a high enough frequency,can be decomposed into a deterministic signal intrinsic to the rock and a stochastic one resulting from discrete rock failure *** technique of multiresolution analysis based on the maximal overlap discrete wavelet transform is applied as a low-pass filter to the original cutting force signals so as to wipe out the high-frequency components associated with the stochastic rock failure events.A criterion to determine the optimum cutoff frequency of the low-pass filter and the corresponding repeatability length scale is discussed in terms of the correlation coefficients between different filtered *** is shown that the low-pass filtered signals obtained at the optimum cutoff frequency have two salient features:(i)repeatability over different tests conducted at the same depth of cut on the same sample,and(ii)variability along the cutting *** excellent repeatability reveals that the deterministic background trend of the original force signals is relevant to the rock strength property,and the variability of the background trend captures the spatial variation of the rock strength.

关键词： Scratch tests Intrinsic specific energy Rock heterogeneity Wavelet method

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Federated Edge learning for the Wireless Physical Layer:Opportunities and Challenges

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China Communications 2022年第8期19卷 15-30页

作者： Yiming Cui Jiajia Guo Xiangyi Li le liang Shi Jin National Mobile Communications Research Laboratory and Frontiers Science Center for Mobile Information Communication and Security Southeast UniversityNanjing 210096China Purple Mountain Laboratories Nanjing 211111China

Deep learning(DL)has been applied to the physical layer of wireless communication systems,which directly extracts environment knowledge from data and outperforms conventional methods either in accuracy or computation ***,most related research works employ centralized training that inevitably involves collecting training data from edge *** data uploading process usually results in excessive communication overhead and privacy ***,a distributed learning approach named federated edge learning(FEEL)is introduced to physical layer *** FEEL,all devices collaborate to train a global model only by exchanging parameters with a nearby access *** all datasets are kept local,data privacy is better protected and data transmission overhead can be *** paper reviews the studies on applying FEEL to the wireless physical layer including channel state information acquisition,transmitter,and receiver design,which represent a paradigm shift of the DL-based physical layer *** the meantime they also reveal several limitations inherent in FEEL,particularly when applied to the wireless physical layer,thus motivating further research efforts in the field.

关键词： deep learning federated edge learning wireless communication physical layer

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Polycomb and trithorax:Their yin-yang dynamics in plants

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Molecular Plant 2024年第6期17卷 845-847页

作者： Fan Xu Daolei Zhang liang le Li Pu Biotechnology Research Institute Chinese Academy of Agricultural SciencesBeijing 100081China School of Life Science Inner Mongolia UniversityHohhot 010021China

Polycomb(PcG)and trithorax(trxG)are two groups of conserved epigenetic complexes that maintain active and repressive states of target genes by altering their chromatin states to regulate plant development and stress *... 详细信息

关键词： maintain complexes states

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Synthesis of anionic sulphonate-crown ether surfactants

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Chinese Chemical letters 2013年第12期24卷 1137-1139页

作者： Jing Zhou He-le liang Qing-De Chen Xing-Hai Shen Beijing National Laboratory for Molecular Sciences (BNLMS) Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental ScienceCollege of Chemistry and Molecular EngineeringPeking University

Two sulphonate-crown ether surfactants （sodium （4＇-dodecanoyldJbenzo-18-crown-6）-4＂（5＂）-sulpho- nate, ammonium （4＇-dodecanoyldibenzo-18-crown-6）-4＂（5＂）-sulphonate） were designed and synthesized via a two-step continuous method. The products were purified and characterized by IR. 1H NMR and elemental analysis. The physicochemical properties of the surfactants were studied by fluorescence, conductivity and dynamic light scattering techniques.

关键词： Crown ether Sulphonate Surfactant Synthesis

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Impact point prediction guidance of ballistic missile in high maneuver penetration condition

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Defence Technology（防务技术） 2023年第8期26卷 213-230页

作者： Yong Xian le-liang Ren Ya-jie Xu Shao-peng Li Wei Wu Da-qiao Zhang Xi'an Research Institute of High Technology Xi'an710025China Department of Automation Tsinghua UniversityBeijing100084China

An impact point prediction(IPP) guidance based on supervised learning is proposed to address the problem of precise guidance for the ballistic missile in high maneuver penetration *** accurate ballistic trajectory model is applied to generate training samples,and ablation experiments are conducted to determine the mapping relationship between the flight state and the impact *** the same time,the impact point coordinates are decoupled to improve the prediction accuracy,and the sigmoid activation function is improved to ameliorate the prediction ***,an IPP neural network model,which solves the contradiction between the accuracy and the speed of the IPP,is *** view of the performance deviation of the divert control system,the mapping relationship between the guidance parameters and the impact deviation is analysed based on the variational *** addition,a fast iterative model of guidance parameters is designed for reference to the Newton iteration method,which solves the nonlinear strong coupling problem of the guidance parameter *** Carlo simulation results show that the prediction accuracy of the impact point is high,with a 3 σ prediction error of 4.5 m,and the guidance method is robust,with a 3 σ error of 7.5 *** the STM32F407 singlechip microcomputer,a single IPP takes about 2.374 ms,and a single guidance solution takes about9.936 ms,which has a good real-time performance and a certain engineering application value.

关键词： Ballistic missile High maneuver penetration Impact point prediction Supervised learning Online guidance Activation function

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Nanoprobes for super-resolution fluorescence imaging at the nanoscale

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Science China Chemistry 2014年第1期57卷 100-106页

作者： HOU ShangGuo liang le DENG SuHui CHEN JianFang HUANG Qing CHENG Ya FAN ChunHai Division of Physical Biology and Bioimaging Center Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

Compared with other imaging techniques,fluorescence microscopy has become an essential tool to study cell biology due to its high compatibility with living *** to the resolution limit set by the diffraction of light,fluorescence microscopy could not resolve the nanostructures in the range ofleaching and *** probe technology is crucial in the design and implementation of super-resolution imaging methods.

关键词： super-resolution microscopy,diffraction barrier,switching characteristic

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Joint Design of ISAC Waveform Under PAPR Constraints

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China Communications 2024年第7期21卷 186-211页

作者： Chen Yating Wen Cai Huang Yan liang le Li Jie Zhang Hui Hong Wei State Key Lab of Millimeter Waves Southeast UniversityNanjing 211100China School of Information Science and Technology Northwest UniversityXi’an 710127China National Mobile Communications Research Laboratory Nanjing 211100China College of Electronic and Information Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211100China

In this paper,we formulate the precoding problem of integrated sensing and communication(ISAC)waveform as a non-convex quadratically constrained quadratic programming(QCQP),in which the weighted sum of communication multi-user interference(MUI)and the gap between dual-use waveform and ideal radar waveform is minimized with peak-toaverage power ratio(PAPR)*** propose an efficient algorithm based on alternating direction method of multipliers(ADMM),which is able to decouple multiple variables and provide a closed-form solution for each *** addition,to improve the sensing performance in both spatial and temporal domains,we propose a new criteria to design the ideal radar waveform,in which the beam pattern is made similar to the ideal one and the integrated sidelobe level of the ambiguity function in each target direction is minimized in the region of *** limited memory Broyden-Fletcher-Goldfarb-Shanno(LBFGS)algorithm is applied to the design of the ideal radar waveform which works as a reference in the design of the dual-function *** results indicate that the designed dual-function waveform is capable of offering good communication quality of service(QoS)and sensing performance.

关键词： ambiguity function integrated sensing and communication MIMO OFDM PAPR waveform design

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Effect of Different Types of Structural Configuration on Air Distribution in a Compact Purification Device

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Journal of Donghua University(English Edition) 2020年第6期37卷 483-492页

作者： YANG Xuebin liang le LIU Hao LIU Lin liang Zhen WANG Fang College of Environmental Science and Engineering Donghua UniversityShanghai 201620China College of Urban Construction and Safety Engineering Shanghai Institute of TechnologyShanghai 201418China School of Energy and Environment Zhongyuan University of TechnologyZhengzhou 450007China

In some old industrial plants,in order to meet the increasingly strict requirements of pollutant emission limits,it is necessary to install the compact filtration and/or purification devices in a given narrow machine *** types of structural configuration might influence air distribution inside these *** unreasonable air distribution might lead each part of filtration or purification media to operating at largely different air flow *** on a computational fluid dynamics(CFD)model,this study explores the influence of different outlet positions and different upper heights on the flow field inside *** porous medium model is employed to simulate the air flow in porous *** changing structural configurations include three positioning cases of the outlet opening and eight height cases of the upper *** root mean square is defined as the non-uniformity coefficient to evaluate the uniformity of air flow *** results show that the farther distance between inlet and outlet openings will bring more uniform air distribution,and the increasing height of upper chamber totally trends to exhibit more uniform air distribution.

关键词： structural configuration air distribution uniform air distribution compact purification device coefficient of velocity inhomogeneity

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The trxG protein ULT1 regulates Arabidopsis organ size by interacting with TCP14/15 to antagonize the LIM peptidase DA1 for H3K4me3 on target genes

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Plant Communications 2024年第4期5卷 255-274页

作者： Fan Xu Huixue Dong Weijun Guo liang le Yexing Jing Jennifer C.Fletcher Jiaqiang Sun Li Pu Biotechnology Research Institute Chinese Academy of Agricultural SciencesBeijing 100081China State Key Laboratory of Crop Gene Resources and Breeding Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China Department of Plant and Microbial Biology University of CaliforniaBerkeleyBerkeleyCA 94720USA Plant Gene Expression Center United States Department of Agriculture-Agricultural Research ServiceAlbanyCA 94710USA These authors contributed equally to this article

Plant organ size is an important agronomic trait that makes a significant contribution to plant *** its central importance,the genetic and molecular mechanisms underlying organ size control remain to be fully ***,we report that the trithorax group protein ULTRAPETALA1(ULT1)interacts with the TEOSINTE BRANCHED1/CYCLOIDEA/PCF14/15(TCP14/15)transcription factors by antagonizing the LIN-11,ISL-1,and MEC-3(LIM)peptidase DA1,thereby regulating organ size in *** of ULT1 function significantly increases rosette leaf,petal,silique,and seed size,whereas overexpression of ULT1 results in reduced organ ***1 associates with TCP14 and TCP15 to co-regulate cell size by affecting cellular *** analysis revealed that ULT1 and TCP14/15 regulate common target genes involved in endoreduplication and leaf ***1 can be recruited by TCP14/15 to promote lysine 4 of histone H3 trimethylation at target genes,activating their expression to determinefinal cell ***,we found that ULT1 influences the interaction of DA1 and TCP14/15 and antagonizes the effect of DA1 on TCP14/15 ***,ourfindings reveal a novel epigenetic mechanism underlying the regulation of organ size in Arabidopsis.

关键词： ULT1 TCP DA1 organ size endoreduplication

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基于内点法和遗传算法相结合的交直流系统无功优化

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高电压技术 2015年第3期41卷 724-729页

作者：蒋平梁乐东南大学电气工程学院南京210096 江苏省电力公司检修分公司南京210096

为简化传统交直流混合系统潮流计算方法,提出了一种改进算法。该算法采用Gauss-Seidel迭代法求解直流系统,通过调整换流变压器的变比以使换流器的触发角运行在合适的值域,再与交流系统交替迭代求解。针对遗传算法适合处理离散变量但容... 详细信息

为简化传统交直流混合系统潮流计算方法,提出了一种改进算法。该算法采用Gauss-Seidel迭代法求解直流系统,通过调整换流变压器的变比以使换流器的触发角运行在合适的值域,再与交流系统交替迭代求解。针对遗传算法适合处理离散变量但容易陷入局部最优而内点法具有方向性但不适合处理离散变量的不足,提出一种内点法和遗传算法相结合的混合算法对交直流系统无功优化模型求解,交流系统中少量的离散控制变量及直流系统控制变量采用遗传算法求解而交流系统中大量的连续控制变量则采用内点法求解。混合算法结合了两种算法的优点,可以方便地处理离散变量且具有明显的方向性。通过实例仿真验证了该算法具有收敛性好、运算速度快等优点。

关键词：特高压交直流系统高电压直流输电遗传算法内点法无功优化

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