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Friction 2024年第8期12卷 1707-1715,F0004页

作者： Yushan CHEN Liang jiang Linmao QIAN Tribology Research Institute State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China

Accurately measuring the coefficient of friction(COF)is the fundamental prerequisite of superlubricity *** study aimed to reduce the COF measurement resolutionΔμof atomic force microscopy(AFm).Based on the theoretical model,a distinctive strategy was adopted to reduceΔμby optimizing the cantilever’s cross-section of the AFm probe,inspired by civil engineering.Δμcan be reduced by decreasing the width of the horizontal side wR and the wall thickness t and increasing the width of the vertical side ***,the I-shape demonstrates the highest reduction inΔμ,followed by the *** the processability,the AFm probe with the U-shaped cross-sectional cantilever was investigated further,and the dimensions are 35μm wR,3.5μm wH,0.5μm t,50μm l(cantilever length),and 23μm htip(tip height).The finite element analysis results confirm its *** being fabricated and calibrated,the AFm probe achieves the minimalΔμof 1.9×10^(–6)under the maximum normal force so ***,the friction detection capability of the fabricated AFm probe improves by 78 times compared to the commercial tipless-force modulation mode(TL-Fm)AFm probe with the conventional solid rectangular cross-sectional *** study provides a powerful tool for measuring 10^(–6)COF.

关键词： atomic force microscopy superlubricity coefficient of friction probe cantilever

Thermo-hydro-mechanical (THm) coupled simulation of the land subsidence due to aquifer thermal energy storage (ATES) system in soft soils

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Journal of Rock mechanics and geotechnical Engineering 2024年第6期16卷 1952-1966页

作者： Yang Wang Fengshou Zhang fang Liu Department of geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Key Laboratory of geotechnical and Underground Engineering of ministry of Education Tongji UniversityShanghai200092China Shanghai Engineering and Technology Research Center of Shallow geothermal Energy Shanghai200072China

Aquifer thermal energy storage(ATES)system has received attention for heating or cooling ***,it is well known that land subsidence becomes a major environmental concern for ATES ***,the effect of temperature on land subsidence has received practically no attention in the *** paper presents a thermo-hydro-mechanical(THm)coupled numerical study on an ATES system in Shanghai,*** water wells were installed for seasonal heating and cooling of an agriculture *** target aquifer at a depth of 74e104.5 m consisted of alternating layers of sand and silty sand and was covered with *** level,temperature,and land subsidence data from 2015 to 2017 were collected using field monitoring *** by data,we constructed a field scale three-dimensional(3D)model using TOUgH(Transport of Unsaturated groundwater and Heat)and FLAC3D(Fast Lagrangian Analysis of Continua)equipped with a thermo-elastoplastic constitutive *** effectiveness of the numerical model was validated by field *** model was used to reproduce groundwater flow,heat transfer,and mechanical responses in porous media over three years and capture the thermo-and pressure-induced land *** results show that the maximum thermoinduced land subsidence accounts for about 60%of the total *** thermo-induced subsidence is slightly greater in winter than that in summer,and more pronounced near the cold well area than the hot well *** study provides some valuable guidelines for controlling land subsidence caused by ATES systems installed in soft soils.

关键词： Aquifer thermal energy storage(ATES) Land subsidence TOUgH-FLAC3D Thermo-elastoplastic constitutive model

The lysine methyltransferase SmYD2 facilitates neointimal hyperplasia by regulating the HDAC3-SRF axis

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Acta Pharmaceutica Sinica B 2024年第2期14卷 712-728页

作者： Xiaoxuan Zhong Xiang Wei Yan Xu Xuehai Zhu Bo Huo Xian guo gaoke Feng Zihao Zhang Xin Feng Zemin fang Yuxuan Luo Xin Yi Ding-Sheng jiang Division of Cardiovascular Surgery Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Key Laboratory of Organ Transplantation Ministry of EducationNHC Key Laboratory of Organ TransplantationChinese Academy of Medical SciencesWuhan 430030China School of Life Science and Technology Key Laboratory of Developmental Genes and Human DiseaseSoutheast UniversityNanjing 210096China Department of Cardiology Renmin Hospital of Wuhan UniversityWuhan 430060China

Coronary restenosis is an important cause of poor long-term prognosis in patients with coronary heart ***,we show that lysine methyltransferase SmYD2 expression in the nucleus is significantly elevated in serum-and PDgF-BB-induced vascular smooth muscle cells(VSmCs),and in tissues of carotid artery injury-induced neointimal ***2 overexpression in VSmCs(Smyd2-vTg)facilitates,but treatment with its specific inhibitor LLY-507 or SmYD2 knockdown significantly inhibits VSmC phenotypic switching and carotid artery injury-induced neointima formation in *** sequencing revealed that SmYD2 knockdown represses the expression of serum response factor(SRF)target genes and that SRF overexpression largely reverses the inhibitory effect of SmYD2 knockdown on VSmC ***3 directly interacts with and deacetylates SRF,which enhances SRF transcriptional activity in ***,SmYD2 promotes HDAC3 expression via tri-methylation of H3K36 at its ***966,a specific inhibitor of HDAC3,not only counteracts the pro-proliferation effect of SmYD2 overexpression on VSmCs,but also inhibits carotid artery injury-induced neointima formation in ***3 partially abolishes the inhibitory effect of SmYD2 knockdown on VSmC proliferation in a deacetylase activity-dependent *** results reveal that the SmYD2-HDAC3-SRF axis constitutes a novel and critical epigenetic mechanism that regulates VSmC phenotypic switching and neointimal hyperplasia.

关键词： Neointimaformation Histonemethylation Histoneacetylation SRFacetylation SmYD2 HDAC3 LLY-507 RgFP966

融合处理速度和加速度记录的地震检测模型及其在新丰江水库的应用

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地球科学 2024年第2期49卷 469-479页

作者：蒋策吕作勇房立华中国地震局地球物理研究所北京100081 广东省地震局广东广州510070 中国地震局震源物理重点实验室北京100081

随着国家地震烈度速报与预警工程的建设,加速度记录在地震科学中将得到越来越多的应用.但目前的地震检测模型多使用速度记录训练,对加速度记录的检测效果较差.利用广东地震台网数据,训练得到了可检测速度记录的PhaseNet_gD模型和检测加... 详细信息

随着国家地震烈度速报与预警工程的建设,加速度记录在地震科学中将得到越来越多的应用.但目前的地震检测模型多使用速度记录训练,对加速度记录的检测效果较差.利用广东地震台网数据,训练得到了可检测速度记录的PhaseNet_gD模型和检测加速度记录的PhaseNet_ITS模型.在此基础上,结合gammA震相关联和HYPOSAT地震定位方法,发展了一套新的地震数据智能处理流程,并处理了2023年新丰江水库m_(L)4.8地震序列,检测出的事件数量是人工目录的3.8倍,匹配率为93.2%,误检测率为0.38%.这一系统可快速产出完备性高、高精度的地震目录,为水库地震监测和区域地震台网的数据实时处理提供技术支撑.

关键词：区域台网深度学习地震检测 PhaseNet 新丰江水库水库地震

基于改进自适应协同控制方法的电力系统混沌控制

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电子与信息学报 2024年第2期46卷 728-737页

作者：方洁张少辉江泳郑州轻工业大学电气信息工程学院郑州450002

针对4阶混沌电力系统,该文提出一种具有快速收敛特性的自适应协同控制方案。首先基于Lyapunov稳定性定理和全局快速收敛理论,设计了一种具有快速收敛特性的协同控制器,该控制器可使宏变量快速到达不变流形并可以得到平滑无抖振的控制输... 详细信息

针对4阶混沌电力系统,该文提出一种具有快速收敛特性的自适应协同控制方案。首先基于Lyapunov稳定性定理和全局快速收敛理论,设计了一种具有快速收敛特性的协同控制器,该控制器可使宏变量快速到达不变流形并可以得到平滑无抖振的控制输入,实现宏变量的精确收敛。然后将所设计的控制器应用于4阶电力系统的混沌控制中。由于电力系统中的能量过剩会引起混沌振荡,在控制回路中引入储能装置,通过控制储能装置吸收电力系统中多余的有功功率来抑制其混沌振荡。在此基础上通过设计自适应律,消除了控制器设计过程中出现的复杂项,增加了控制器的实用性。最后通过数值仿真,验证了该控制方案的有效性与优越性。

关键词： 4阶电力系统混沌振荡自适应协同控制储能装置快速收敛

Standardized ileal digestibility of amino acids in soybean meal fed to non-pregnant and pregnant sows

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Journal of Animal Science and Biotechnology 2024年第1期15卷 362-373页

作者： Ke Wang Ya Wang Lei guo Yong Zhuo Lun Hua Lianqiang Che Shengyu Xu Ruinan Zhang Jian Li Bin Feng Zhengfeng fang Xuemei jiang Yan Lin De Wu Institute of Animal Nutrition Key Laboratory for Animal Disease‑Resistance Nutrition of ChinaMinistry of EducationSichuan Agricultural University211 Huimin RoadWenjiang DistrictChengdu 611130SichuanChina

Background Two studies were designed to determine standard ileal crude protein(CP)and amino acid(AA)digestibility of soybean meal(SBm)from different origins fed to non-pregnant and pregnant *** solvent-extracted SBms from soybeans produced in the USA,Brazil,and China were *** Exp.1,eight different diets were created:a nitrogen(N)-free diet and 7 experimental diets containing SBm from different origins as the only N *** non-pregnant,multiparous sows were arranged in an 8×8 Latin square design(8 periods and 8 diets).In Exp.2,the diet formula was the same as in *** gestating sows(parity 3)were assigned to 4 different diets in a replicated 4×3 Youden square design(three periods and four diets)in mid-gestation and again in late-gestation *** When fed to non-pregnant and late-gestating sows,the standardized ileal digestibility(SID)of CP and most AAs from different SBm were not significantly different(P>0.05).When fed to mid-gestating sows,the SID values for Arg,His,Lys,Phe,Cys,gly,Ser,and Tyr in SBm 1 were lower than in SBm 4 and 5(Pm SBm 5 was higher than in SBm 1 and 4(Pm SBm 4 were lower than in SBm 1 and 5(Pgnificantly greater SID values for Lys,Ala,and Asp during mid-gestation when compared with late-gestation stages(Pmid-gestating sows had greater SID value for Val and lower SID value for Tyr when compared with non-pregnant and late-gestating sows(Pgnant sows had significantly greater SID value for met when compared with gestating sows(Pmid-gestating sows,the SID values for most AAs varied among SBm *** SID values for Lys,met,Val,Ala,Asp,and Tyr in SBm were affected by sow gestation *** findings provide a cornerstone for accurate SBm use in sow diets.

关键词： Amino acids Sows Soybean meal Standardized ileal digestibility

Discontinuous phase diagram of amorphous carbons

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National Science Review 2024年第4期11卷 164-171页

作者： YinBo Zhu ZhouYu fang ZhongTing Zhang HengAn Wu CAS Key Laboratory of mechanical Behavior and Design of materials Department of Modern MechanicsUniversity of Science and Technology of China State Key Laboratory of Nonlinear mechanics Institute of Mechanics Chinese Academy of Sciences

The short-range order and medium-range order of amorphous carbons demonstrated in experiments allow us to rethink whether there exist intrinsic properties hidden by atomic disordering. Here we presented six representative phases of amorphous carbons（0.1–3.4 g/cm3）, namely, disordered graphene network（DgN）, high-density amorphous carbon（HDAC）, amorphous diaphite（a-Dg）, amorphous diamond（a-D）, paracrystalline diamond（p-D）, and nano-polycrystalline diamond（NPD）, respectively, classified by their topological features and microstructural characterizations that are comparable with experiments. To achieve a comprehensive physical landscape for amorphous carbons, a phase diagram was plotted in the sp3/sp2versus density plane, in which the counterintuitive discontinuity originates from the inherent difference in topological microstructures, further guiding us to discover a variety of phase transitions among different amorphous carbons. Intriguingly, the power law, log（sp3/sp2） ∝ ρn, hints at intrinsic topology and hidden order in amorphous carbons, providing an insightful perspective to reacquaint atomic disorder in non-crystalline carbons.

关键词： amorphous carbons disordered carbons phase diagram microstructural topology phase transition

A Real-Time Small Target Vehicle Detection Algorithm with an Improved YOLOv5m Network model

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Computers, materials & Continua 2024年第1期78卷 303-327页

作者： Yaoyao Du Xiangkui jiang School of Automation Xi’an University of Posts and TelecommunicationsXi’an710121China

To address the challenges of high complexity,poor real-time performance,and low detection rates for small target vehicles in existing vehicle object detection algorithms,this paper proposes a real-time lightweight architecture based on You Only Look Once(YOLO)***,a lightweight upsampling operator called Content-Aware Reassembly of Features(CARAFE)is introduced in the feature fusion layer of the network to maximize the extraction of deep-level features for small target vehicles,reducing the missed detection rate and false detection ***,a new prediction layer for tiny targets is added,and the feature fusion network is redesigned to enhance the detection capability for small ***,this paper applies L1 regularization to train the improved network,followed by pruning and fine-tuning operations to remove redundant channels,reducing computational and parameter complexity and enhancing the detection efficiency of the *** is conducted on the VisDrone2019-DET *** experimental results show that the proposed algorithmreduces parameters and computation by 63.8% and 65.8%,*** average detection accuracy improves by 5.15%,and the detection speed reaches 47 images per second,satisfying real-time *** with existing approaches,including YOLOv5m and classical vehicle detection algorithms,our method achieves higher accuracy and faster speed for real-time detection of small target vehicles in edge computing.

关键词： Vehicle detection YOLOv5m small target channel pruning CARAFE

Removal of Cr(Ⅵ)by glutaraldehyde-crosslinked chitosan encapsulating microscale zero-valent iron:Synthesis,mechanism,and longevity

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Journal of Environmental Sciences 2024年第8期142卷 115-128页

作者： Yijun Duan fang Liu Xiang Liu miao Li School of Environment Tsinghua UniversityBeijing 100084China Transportation Institute of Inner mongolia University Hohhot 010070China

microscale zero-valent iron(mZVI)has shown great potential for groundwater Cr(Ⅵ)***,low Cr(Ⅵ)removal capacity caused by passivation restricted the wide use of *** prepared mZVI/gCS by encapsulating mZVI in a porous glutaraldehydecrosslinked chitosan matrix,and the formation of the passivation layer was alleviated by reducing the contact between zero-valent iron *** average pore diameter of mZVI/gCS was 8.775 nm,which confirmed the mesoporous characteristic of this *** of batch experiments demonstrated that mZVI/gCS exhibited high Cr(Ⅵ)removal efficiency in a wide range of pH(2-10)and temperature(5-35℃).Common groundwater coexisting ions slightly affected m ZVI/*** material showed great reusability,and the average Cr(Ⅵ)removal efficiency was 90.41%during eight *** this study,we also conducted kinetics and isotherms ***-second-order model was the most matched kinetics *** Cr(Ⅵ)adsorption process was fitted by both Langmuir and Freundlich isotherms models,and the maximum Langmuir adsorption capacity of m ZVI/gCS reached243.63 mg/g,which is higher than the adsorption capacities of materials reported in most of the previous ***,the column capacity for Cr(Ⅵ)removal of a mZVI/gCS-packed column was 6.4 times higher than that of a mZVI-packed column in a 50-day ***,mZVI/gCS with a porous structure effectively relieved passivation problems of mZVI and showed practical application prospects as groundwater Cr(Ⅵ)remediation material with practical application prospects.

关键词： Chitosan glutaraldehyde mZVI Cr(Ⅵ) groundwater

gelfand-Kirillov Dimension and Reducibility of Scalar generalized Verma modules for Classical Lie Algebras

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Acta mathematica Sinica,English Series 2024年第3期40卷 658-706页

作者： Zhan Qiang BAI Jing jiang School of mathematical Sciences Soochow UniversitySuzhou 215006P.R.China E-mail:zqbai@*** jjsd6514@***

Let g be a classical complex simple Lie algebra and q be a parabolic *** m be a generalized Verma module induced from a one dimensional representation of *** m is called a scalar generalized Verma *** this paper,we will determine the reducibility of scalar generalized Verma modules associated to maximal parabolic subalgebras by computing explicitly the gelfand-Kirillov dimension of the corresponding highest weight modules.

关键词： generalized Verma module gelfand-Kirillov dimension Young tableau