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基于前景-背景特征交互的小样本语义分割

中南民族大学学报（自然科学版） 2024年第4期43卷 513-521页

作者：陆志明陈少波中南民族大学电子信息工程学院武汉430074

建立支持图像和查询图像中目标对象的特征信息之间的联系是现有小样本语义分割的主流方法.然而这类方法大多没有通过挖掘背景信息辅助前景目标信息的预测,因此提出了一种前景与背景特征交互的小样本分割网络.具体来说,在传统的基于目标... 详细信息

建立支持图像和查询图像中目标对象的特征信息之间的联系是现有小样本语义分割的主流方法.然而这类方法大多没有通过挖掘背景信息辅助前景目标信息的预测,因此提出了一种前景与背景特征交互的小样本分割网络.具体来说,在传统的基于目标信息的双分支小样本分割网络中添加一条新分支用于显式地预测查询图像的背景区域,之后预测出的背景区域被用于修正预测出的前景目标区域.同时,在K-shot情景下,通过自适应调整单张支持图像在支持原型中的贡献比例缓解支持偏置.最后,在标准小样本分割数据集上进行了实验:在PASCAL-5i数据集1-shot设置下的测试结果mIoU分别比NTRENet和MMNet提高了0.4%和2.8%.

关键词：小样本学习语义分割非目标区域预测

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基于解析解的高地温圆形隧道温度场分布研究

武汉大学学报（工学版） 2024年第7期57卷 925-932页

作者：张毅峰刘琛尧李国良晏启祥陆志明西南交通大学交通隧道工程教育部重点实验室四川成都610031 中铁第一勘察设计院集团有限公司陕西西安710043

高地温隧道相对于常规隧道在径向有着更复杂的结构,研究隧道断面温度场对解决隧道高地温相关问题有着重要意义。采用极坐标形式建立圆形高地温隧道断面温度场的数学模型,并采用Laplace公式对热传导问题进行求解,得到了衬砌-隔热层-围岩... 详细信息

高地温隧道相对于常规隧道在径向有着更复杂的结构,研究隧道断面温度场对解决隧道高地温相关问题有着重要意义。采用极坐标形式建立圆形高地温隧道断面温度场的数学模型,并采用Laplace公式对热传导问题进行求解,得到了衬砌-隔热层-围岩3层结构下温度场的解析公式;经过MATLAB编程求解计算,得到了温度场的时空演变规律,并建立了对应的数值模型验证其结果的可靠性。结果表明:隧道内部大气温度波动时衬砌与隔热层的温度呈周期性变化,且随着距隧道中心距离增大温度场振幅逐渐减小;温度场呈环状分布,隔热层处的温度梯度最大,衬砌和围岩的温度梯度较小;衬砌内侧温度与隔热层内部温度同步,而隔热层外侧温度波动滞后于衬砌内侧温度;数值模型解析解结果与隔热层外侧温度变化规律一致。

关键词：高地温隧道温度场数值模型解析解

Coupling framework for a wind speed forecasting model applied to wind energy

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Science China(Technological Sciences) 2022年第10期65卷 2462-2473页

作者： DENG Ying CHONG KaiLeong WANG BoFu ZHOU Quan lu zhiming Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai 200072China

Wind energy is the burgeoning renewable energy. Accurate wind speed prediction is necessary to ensure the stability and reliability of the power grid for wind energy. This study focuses on developing a novel hybrid forecasting model to tackle adverse effects caused by strong variability and abrupt changes in wind speed. The hybrid model combines data decomposition and error correction strategy for a wind speed forecasting model applied to wind energy. First, wavelet packet decomposition is applied to wind speed series to obtain stationary subseries. Next, outlier robust extreme learning machine is implemented to predict subseries. Finally, an error correction strategy coupled with data decomposition is designed to repair preliminary prediction results. In addition, four measured datasets from China and USAwind farms with different time intervals are used to evaluate the performance of the proposed approach. Experimental analysis indicates that the proposed model outperforms the compared models. Results show that(1) the prediction accuracy of the proposed model is remarkably improved compared with other conventional models;(2) the proposed model can reduce the influence of the end effect in the decomposition-based forecasting model;(3) the coupling framework is successful for enhancing performance of hybrid forecasting model.

关键词： wind speed forecasting artificial intelligence hybrid model data preprocessing error correction wavelet packet decomposition

亭子口灌区一期工程弃渣场选址及防护措施设计应用

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水利水电工程设计 2024年第1期43卷 57-60页

作者：张颜卢志明王晓杰中水北方勘测设计研究有限责任公司天津300222 中国市政工程中南设计研究总院有限公司武汉430000

随着我国对生态环境、水土保持重视力度的加大,国家相继出台有关法律法规,不断提高对弃渣场建设的要求。灌区工程线路长,覆盖面广,尤其是位于西南土石山区的灌区工程,受地形地貌限制,隧洞占比高,产生的弃渣量大,对弃渣的妥善处置和弃渣... 详细信息

随着我国对生态环境、水土保持重视力度的加大,国家相继出台有关法律法规,不断提高对弃渣场建设的要求。灌区工程线路长,覆盖面广,尤其是位于西南土石山区的灌区工程,受地形地貌限制,隧洞占比高,产生的弃渣量大,对弃渣的妥善处置和弃渣场的防护变得尤为重要。结合亭子口灌区一期工程,对弃渣场的防护措施进行了探讨,为同类项目开展弃渣场的设计提供参考和借鉴。

关键词：亭子口灌区弃渣场水土保持防护措施西南土石山区

Effectiveness of Group-Based Interventions for Fall Prevention Among Community-Dwelling Older Adults—7 Regions,6 PLADs,China,2019–2020

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China CDC weekly 2023年第47期5卷 1047-1051,I0001页

作者： Yuliang Er zhiming lu Ye Jin Pengpeng Ye Leilei Duan National Center for Chronic and Noncommunicable Disease Control and Prevention Chinese Center for Disease Control and PreventionBeijingChina Department of Epidemiology and Biostatistics Institute of Basic Medical Sciences Chinese Academy of Medical SciencesSchool of Basic Medicine Peking Union Medical CollegeBeijingChina

Summary What is already known about this topic?Many of the current studies focusing on fall prevention interventions have been conducted in hospital settings within a select few urban areas in China,thus yielding limi... 详细信息

关键词： prevention yielding urban

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智能模具技术研究与应用

模具制造 2024年第2期24卷 39-41页

作者：黄炳华卢志明温伟源珠海格力精密模具有限公司广东珠海519070

以空调面壳为研究对象,介绍了智能模具技术研究与应用,分别从仿真分析、压力传感器使用等方面进行阐述。经实际生产验证,模具运行稳定,生产的塑件达到了使用要求,可为类似塑件的模具设计提供参考。

关键词：智能模具技术应用注射成型

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Lagrangian coherent structures and their heat-transport mechanism in the turbulent Rayleigh-Bénard convection

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Science China(Technological Sciences) 2022年第4期65卷 966-976页

作者： CHENG Hang SHEN Jie ZHANG YiZhao ZHOU Quan CHONG Kai Leong LIU Yulu lu zhiming Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy Engineering and School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China The School of Sciences Shanghai Institute of TechnologyShanghai 200072China

In this paper,we investigate the Lagrangian coherent structures(LCSs)and their heat-transport mechanism in turbulent Rayleigh-Bénard(RB)*** numerical simulations(DNS)are performed in a closed square cell with Rayleigh numbers(Ra)ranging from 10^(6) to 10^(9) and Prandtl(Pr)number fixed at Pr=***,our results show the power-law relationship between Nusselt number(Nu)and Ra,Nu=0.99Ra^(0.30±0.02),confirming the results from previous *** gain insights into the material transport,LCSs are extracted using the finite-time Lyapunov exponent(FTLE)***,lobe structures are widely present,and we elucidate their role in transporting heat from the corner rolls to large-scale ***,the relationships between LCSs and thermal plumes are examined,and we identify two behaviors of thermal plumes:first,most plumes transport along the LCSs;second,few plumes are exposed to the bulk and subsequently mix with the turbulent ***,we quantify the heat flux along the LCSs,which contributes to about 85%of the total flux regardless of *** suggests that LCSs play a significant role in heat ***,the viscous(thermal)dissipation rate along the LCSs is quantified,which is larger than 80%(60%)of the total value,suggesting that LCSs are responsible for the large viscous and thermal dissipations.

关键词： Rayleigh-Bénard convection finite-time Lyapunov exponent Lagrangian coherent structures

Frustrated superconductivity and sextetting order

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Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 168-176页

作者： zhiming Pan Chen lu Fan Yang Congjun Wu Institute for Theoretical Sciences Westlake UniversityHangzhou 310024China New Cornerstone Science Laboratory Department of PhysicsSchool of ScienceWestlake UniversityHangzhou 310024China School of Physics Beijing Institute of TechnologyBeijing 100081China Key Laboratory for Quantum Materials of Zhejiang Province School of ScienceWestlake UniversityHangzhou 310024China Institute of Natural Sciences Westlake Institute for Advanced StudyHangzhou 310024China

The superconducting state typically favors a uniform spatial distribution akin to ***,the pair-densitywave state exhibits sign changes in the pairing order,leading to potential frustrations in phase *** propose a mechanism to the sextetting order stemming from the frustrations in the phase coherence of a pair-density-wave state,whose spatial modulation manifests a vortex-antivortex honeycomb *** classical ground state configurations are mapped to Baxter's three-coloring model,revealing a macroscopic degeneracy accompanied by extensive *** phase coherence problem intertwines the U(1)phases and the vorticity *** the resultant color and phase fluctuations suppress the pair-densitywave order,they maintain the sextetting order above the superconducting transition temperature(T_(c)).The 1/3-fractional vortex emerges as the fundamental topological defect in the sextetting *** novel mechanism of frustrated superconductivity provides an alternative explanation for the experimental observed fractional oscillations in CsV_(3)Sb_(5).

关键词： frustrated superconductivity pair density wave charge-6e order

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Effect of Rare-Earth Element Substitution in Superconducting R_(3)Ni_(2)O_(7) under Pressure

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Chinese Physics Letters 2024年第8期41卷 77-81页

Recently,high temperature(T_(c)≈80 K)superconductivity(SC)has been discovered in La_(3)Ni_(2)O_(7)(LNO)under *** raises the question of whether the superconducting transition temperature T_(c) could be further enhanced under suitable *** possible route for achieving higher T_(c) is element *** SC could appear in the Fmmm phase of rare-earth(RE)R_(3)Ni_(2)O_(7)(RNO,R=RE element)material series under suitable *** electronic properties in the RNO materials are dominated by the Ni 3d orbitals in the bilayer NiO_(2) *** the strong coupling limit,the SC could be fully characterized by a bilayer single 3d_(x^(2)−y^(2))-orbital t–J‖–J⊥ *** RE element substitution from La to other RE element,the lattice constant of the Fmmm RNO material decreases,and the resultant electronic hopping integral increases,leading to stronger superexchanges between the 3d_(x^(2)−y^(2)) *** on the slave-boson mean-field theory,we explore the pairing nature and the evolution of T_(c) in RNO materials under ***,it is found that the element substitution does not alter the pairing nature,i.e.,the inter-layer s-wave pairing is always favored in the superconducting RNO under ***,the T_(c) increases from La to Sm,and a nearly doubled T_(c) could be realized in SmNO under *** work provides evidence for possible higher T_(c) R_(3)Ni_(2)O_(7) materials,which may be realized in further experiments.

关键词： element substitution Rare