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Probing top-quark operators with precision electroweak measurements

Chinese Physics C 2022年第11期46卷 118-142页

作者： yiming liu Yuhao Wang Cen Zhang Lei Zhang Jiayin Gu Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China School of Physics Nanjing UniversityNanjing 210093China Department of Physics and Center for Field Theory and Particle Physics Fudan UniversityShanghai 200438China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200433China School of Physical Sciences University of Chinese Academy of ScienceBeijing 100049China Center for High Energy Physics Peking UniversityBeijing 100871China

In the standard model effective field theory,operators involving the top quark are generally difficult to probe and can generate sizable loop contributions to electroweak precision observables measured by past and future lepton *** the high precision of electroweak measurements compensate for loop suppression and provide competitive reaches on these operators?Would the inclusion of these contributions introduce too many additional parameters for a meaningful global electroweak analysis to be performed?In this paper,we perform a detailed phenomenological study to address these two important *** on eight dimension-6 operators that generate anomalous couplings between electroweak gauge bosons and third-generation quarks,we calculate their one loop contributions to e^(+)e^(-)→ff processes,both on and off the Z-pole,and the e^(+)e^(-)→WW process.A global analysis is performed with these eight operators and those that contribute to the above processes at tree level using measurements at the LEP,SLC,and several low energy *** find that although current electroweak precision measurements are sensitive to the one-loop effects of top-quark operators,it is difficult to separate them from the operators that contribute at tree level,making a global analysis rather *** further assumptions(for instance,new physics contributes to only third generation quark operators and the S and T parameters),competitive reaches may be obtained in a global *** important finding of our study is that the two operators that generate the dipole interactions of the bottom quark have a significant impact on the Z-pole measurements and should not be *** also discuss the implications of the recently reported W-boson mass measurement at the CDF for our ***,we estimate the reaches of future lepton colliders in probing top-quark operators with precision electroweak measurements.

关键词： loop-induced processes effective field theory Monte Carlo generator top quark

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Advancing toward the commercial viability threshold of smart windows utilizing thermochromic polymer blends

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Science China Materials 2024年第12期67卷 4111-4112页

作者： Lin Yao yiming liu Wei Li China-UK Low Carbon College Shanghai Jiao Tong UniversityShanghai 201306China Institute for Materials and Processes School of EngineeringThe University of EdinburghEdinburghScotland EH93FBUnited Kingdom

Smart materials have demonstrated significant potential for enhancing thermal efficiency and regulating light infiltration within the context of architectural energy management[1].Recent advancements have focused on incorporating thermochromic materials into transparent elements like windows and skylights,facilitating autonomous control of radiative heat transfer in response to external environmental changes and eliminating the need for external energy sources[2].Considerable efforts have been made to enhance the functionality of existing thermochromic materials through the restructuring of smart window architectures[3]and the design of multifunctional coatings[4],leading to a series of notable ***,the practical deployment of such materials is constrained by significant challenges related to cost-effectiveness,sustainability,and operational lifespan[5,6].These limitations underscore the need for a new class of thermochromic materials that are cost-saving,scalable,non-toxic,and highly *** a recent publication in Joule,Pulickel *** and co-workers[7]proposed an innovative methodology for thermochromic materials applicable to smart windows,utilizing an easily manufacturable and stable polymer blend *** system exhibits high transmittance,substantial solar modulation,remarkable reversibility and durability within an accessible temperature range.

关键词： smart utilizing durability

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MICP纤维加筋优化电渗法加固软黏土的试验研究

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河南理工大学学报（自然科学版） 2025年第1期44卷 166-175页

作者：胡其志陈禹龙刘一鸣陶高梁湖北工业大学土木建筑与环境学院湖北武汉430068 湖北省桥梁安全监控技术及装备技术工程研究中心湖北武汉430068

目的为缓解传统电渗法加固软黏土过程中土体开裂和不均匀沉降等问题,改善软黏土的工程性质,提出微生物诱导碳酸钙沉淀(MICP)技术联合玄武岩纤维加筋优化电渗法处理效果。方法通过开展软黏土室内电渗模型试验,分析电渗过程中的排水量、... 详细信息

目的为缓解传统电渗法加固软黏土过程中土体开裂和不均匀沉降等问题,改善软黏土的工程性质,提出微生物诱导碳酸钙沉淀(MICP)技术联合玄武岩纤维加筋优化电渗法处理效果。方法通过开展软黏土室内电渗模型试验,分析电渗过程中的排水量、电流强度和有效电阻,以及电渗处理后土体表面沉降量、含水率、抗剪强度和pH,结合SEM图像探究不同掺量的玄武岩纤维以及MICP-玄武岩纤维联合作用机制对电渗加固效果的影响机理。结果结果表明:(1)不同掺量的玄武岩纤维对电渗效果影响差异显著,纤维加入软黏土后可抑制电渗过程中的土体裂缝发展与电流衰减,掺量为0.4%的试验组最佳效果;(2)MICP技术与玄武岩纤维加筋的联合使电渗过程变得更加均衡与顺畅,有效改善了电渗固结排水导致的土体表面不均匀沉降;(3)在电渗过程中,MICP反应在土颗粒与纤维表面上生成的碳酸钙沉淀填充加固了土体,提升了土体强度均匀性;(4)MICP技术的加入在提升土体强度的同时减少了土体孔隙液的排出,降低了废液处理的压力,具有更高的环境适应性。结论该研究结果为提升电渗法加固软黏土地基的处理效果提供了新思路,拓展了加固软黏土方法新的可能性。

关键词：电渗法软黏土微生物诱导碳酸钙沉淀玄武岩纤维土体沉降

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Sparse convolutional model with semantic expression for waste electrical appliances recognition

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Science China(Technological Sciences) 2024年第9期67卷 2881-2893页

作者： HAN HongGui liu yiming LI FangYu DU YongPing Faculty of Information Technology Beijing University of TechnologyBeijing 100124China Beijing Key Laboratory of Computational Intelligence and Intelligent System Beijing 100124China Engineering Research Center of Digital Community Ministry of EducationBeijing 100124China Beijing Artificial Intelligence Institute and Beijing Laboratory for Intelligent Environmental Protection Beijing 100124China

Deep neural networks play an important role in the recognition of waste electrical appliances. However, deep neural network components still lack reliability in decision-making features. To address this problem, a sparse convolutional model with semantic expression(SCMSE) is proposed. First, a low-rank sparse semantic expression component, combining the benefits of residual networks and sparse representation, is adapted to enhance sparse feature extraction and semantic expression. Second, a reliable network architecture is obtained by iterating the optimal sparse solution, enhancing semantic expression. Finally, the results of visualization experiments on the waste electrical appliances dataset demonstrate that the proposed SCMSE can obtain excellent semantic performance.

关键词： sparse convolutional model deep neural network semantic expression visualization computer vision

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Balanced augmented jackknife empirical likelihood for two sample U-statistics

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Science China Mathematics 2018年第6期61卷 1129-1138页

作者： Conghua Cheng yiming liu Zhi liu Wang Zhou School of Mathematics and Statistics Zhaoqing University Division of Mathematical Sciences School of Physical and Mathematical SciencesNanyang Technological University Department of Mathematics University of Macao Department of Statistics and Applied Probability National University of Singapore

In this paper, we investigate the two sample U-statistics by jackknife empirical likelihood(JEL),a versatile nonparametric approach. More precisely, we propose the method of balanced augmented jackknife empirical likelihood(BAJEL) by adding two artificial points to the original pseudo-value dataset, and we prove that the log likelihood ratio based on the expanded dataset tends to the χ~2 distribution.

关键词： jackknife empirical likelihood U-statistics ROC curves balanced augmented empirical likelihood

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SNR-adaptive deep joint source-channel coding scheme for image semantic transmission with convolutional block attention module

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The Journal of China Universities of Posts and Telecommunications 2024年第1期31卷 1-11页

作者： Yang Yujia liu yiming Zhang Wenjia Zhang Zhi State Key Laboratory of Networking and Switch Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

With the development of deep learning(DL),joint source-channel coding(JSCC)solutions for end-to-end transmission have gained a lot of *** deep JSCC schemes support dynamically adjusting the rate according to different channel conditions during transmission,enhancing robustness in dynamic wireless ***,most of the existing adaptive JSCC schemes only consider different channel conditions,ignoring the different feature importance in the image processing and *** uniform compression of different features in the image may result in the compromise of critical image details,particularly in low signal-to-noise ratio(SNR)*** address the above issues,in this paper,a dual attention mechanism is introduced and an SNR-adaptive deep JSCC mechanism with a convolutional block attention module(CBAM)is proposed,in which matrix operations are applied to features in spatial and channel dimensions *** proposed solution concatenates the pooling feature with the SNR level and passes it sequentially through the channel attention network and spatial attention network to obtain the importance evaluation *** show that the proposed solution outperforms other baseline schemes in terms of peak SNR(PSNR)and structural similarity(SSIM),particularly in low SNR scenarios or when dealing with complex image content.

关键词： semantic communication joint source-channel coding image transmission

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Crust and Upper Mantle Density Structures beneath the Eastern Tianshan Region and Its Tectonic Implications

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Journal of Earth Science 2024年第3期35卷 828-838页

作者： yiming liu Chao Chen Qing Liang Zhengwang Hu Hubei Subsurface Multi-Scale Imaging Key Laboratory School of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China

The deformation mechanisms of the Tianshan orogenic belt(TOB)are one of the most important unresolved issues in the collision of the Indian and Eurasian *** better understand the lithospheric deformation of the eastern Tianshan orogenic belt,we combined the S-wave tomography and gravity data to develop a three-dimensional(3D)density model of the crust and upper mantle beneath the eastern Tianshan *** show that the crust of the eastern Tianshan is mainly characterized by positive density anomalies,revealing widespread subduction-related magmatism during the *** however have also observed extensive low-density anomalies beneath the eastern Tianshan at depths deeper than~100 km,which is likely linked to a relatively hot *** most fundamental differences of the lithosphere within the eastern Tianshan occur in the uppermost *** uppermost mantle layers in the Bogda Shan and Harlik Shan are relatively *** is likely associated with an eclogite body in the uppermost *** most significant negative anomaly of the uppermost mantle is however found in the Jueluotage tectonic belt and the central Tianshan Block and is possibly associated with depleted mantle *** suggest that these differences related to compositional changes may control the strength of the lithospheric mantle and have affected the uplift of the northern and southern segments of the eastern Tianshan after the Permian.

关键词： constrained inversion gravity anomaly three-dimensional lithospheric density structure eastern Tianshan geodynamics geophysics.

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Hydrocarbon Generation, Migration, and Accumulation in the Eocene Niubao Formation in the Lunpola Basin, Tibet, China: Insights from Basin Modeling and Fluid Inclusion Analysis

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Journal of Earth Science 2020年第1期31卷 195-206页

作者： yiming liu Jiaren Ye Qiang Cao Baolin Yang Zhongrong liu Key Laboratory of Tectonics and Petroleum Resources Ministry of EducationChina University of GeosciencesWuhan 430074China Branch of Exploration Company SINOPECChengdu 610041China

The Eocene Niubao Formation is the primary research target of oil exploration in the Lunpola *** oil was extracted from Well Z1 on the northern margin of the basin in *** this study,an integrated evaluation of the source rock geothermal,and maturity histories and the fluid inclusion and fluid potential distributions was performed to aid in predicting areas of hydrocarbon *** to the abundance of organic matter,the kerogen types,maturity,and oil-sources correlate with the geochemical *** middle submember of the second member of the Niubao Formation(E2n^2-2)is the most favorable source rock based on the amount of oil produced from the E2n^2-3and E2n^***-and twodimensional basin modeling,using BasinMod software,shows that the E2n^2-2source rock started to generate hydrocarbon at 35-30 Ma,reached a maturity of Ro=0.7%at 25-20 Ma,and at present,it has reached the peak oil generation stage with a thermal maturity of Ro=0.8%to less than Ro=1.0%.By using fluid inclusion petrography,fluorescence spectroscopy,and microthermometry,two major periods of oil charging have been revealed at 26.1-17.5 and 32.4-24.6 *** oil accumulation modeling results,conducted by using the Trinity software,show a good fit of the oil shows in the wells and predict that the structural highs and lithologic transitions within the Jiangriaco and Paco sags are potential oil traps.

关键词： Niubao Formation Lunpola Basin source rocks basin modeling fluid inclusions hydrocarbon migration and accumulation petroleum geology

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The storage mechanism difference between amorphous and anatase as supercapacitors

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Green Energy & Environment 2022年第1期7卷 156-164页

作者： Wanggang Zhang yiming liu Zhiyuan Song Changwan Zhuang Aili Wei College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuanShanxi030024China Shanxi Academy of Analytical Sciences TaiyuanShanxi030006China

Although TiO_(2)nanotubes is a promising electrode as supercapacitors due to its high energy density,easy synthesis and chemical stability,there are draw backs such as low conductivity and *** studies concentrated on improving its electrochemical performance itself but little attention was payed to the reason of capacitance differences caused by its different crystal ***,we prepare amorphous and anatase TiO_(2)nanotubes and hydrogenated them by a simple electrochemical hydrogenation method to improve their conductivity and *** then study and compare their morphology and structure differences by SEM,TEM,XRD and *** results show that the pore size distribution,internal structure order and internal carrier concentration are the main reasons for their electrochemical performance *** microporous structure less than 2 nm in amorphous nanotubes act as a trap of electrolyte ions at current density larger than 0.1μA cm^(-2),leading to small charge and discharge *** long-range ordered crystal structure of anatase is more favorable for the orderly diffusion of carriers,reducing the inelastic scattering of carrier diffusion process and the electron hole-complexing probability,making anatase nanotubes exhibit higher coulomb efficiency and cycle stability than that of amorphous ones.

关键词： Electrochemical hydrogenation TiO_(2)nanotube arrays Amorphous Anatase Super capacitor

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Ternary red phosphorus/CoP2/SiO2 microsphere boosts visible-light-driven photocatalytic hydrogen evolution from pure water splitting

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Journal of Materials Science & Technology 2022年第30期125卷 59-66页

作者： Chen Yang Yukun Zhu yiming liu Hongwei Wang Dongjiang Yang School of Environmental Science and Engineering State Key Laboratory of Bio-fibers and Eco-textilesShandong Collaborative Innovation Center of Marine Biobased Fibers and Ecological TextilesQingdao UniversityQingdao 266071China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

Red phosphorus(RP) is a promising visible-light-driven semiconductor for photocatalytic hydrogen evolution,but the activity is restricted due to the rapid charge carrier recombination and sluggish surface reaction ***,cobalt phosphide(CoP_(2)) modified RP heterostructure was developed by in situ phosphorization of cobalt oxide from phosphorus *** tuning the amounts of CoP_(2) in the heterostructure,the optimized hybrid exhibited a HER rate reaching 11.79 μmol h^(-1) under visible light illumination,which is 3.5 times higher than that of the RP with Pt as *** was experimentally indicated that the intimate interaction between CoP_(2) and RP gave rise to improved visible light absorption and accelerated photogenerated electron-holes ***,the CoP_(2) as a noble-metal-free cocatalyst could promote the surface hydrogen evolution reaction,which synergetic benefited the photocatalytic hydrogen production activity.

关键词： Red phosphorus Cobalt phosphide Heterostructure Photocatalytic hydrogen evolution

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