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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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高浓度有机废水“零排放”发展现状及趋势的文献计量学分析

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水处理技术 2025年第1期51卷 1-5,12页

作者：丁士元刘一明刘勇刘军侯立安天津大学地球系统科学学院天津300072 南京万德斯环保科技股份有限公司江苏南京211100 北京师范大学环境学院北京100875

近年来随着经济快速发展,化工行业产生大量高浓度有机废水,此类废水中有机污染物浓度高、污染物种类多、性质差异大、毒性大,存在巨大的环境风险。本文对Web of Science(WOS)核心合集数据库和中国知网(CNKI)核心论文数据库中的相关文献... 详细信息

近年来随着经济快速发展,化工行业产生大量高浓度有机废水,此类废水中有机污染物浓度高、污染物种类多、性质差异大、毒性大,存在巨大的环境风险。本文对Web of Science(WOS)核心合集数据库和中国知网(CNKI)核心论文数据库中的相关文献进行可视化处理,综述了国内外高浓度有机废水研究现状。该领域近十年来我国研究热点集中于高浓度有机废水的“零排放”、资源化利用、膜处理、生化-物化技术方面的研究。并结合现有问题从组合工艺高效处理废水与低成本资源化方向提出可行性建议,包括:1)针对性组合工艺发展,因地制宜实现高浓度有机废水高效、绿色、低价处理;2)开发新型水处理技术,实现低成本、低碳化、高效率工艺升级;3)提升资源化效率,实现水、盐、贵金属和高值有机物甚至是过程中产生热能的回收利用,提升低值废盐等的高值利用;4)模块化和智能化,结合人工智能等实现处理单元模块化、智能化等,升级环保产业新质生产力。

关键词：高浓度有机废水零排放膜处理法资源化

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国密算法SM9的计算性能改进方法

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信息安全研究 2025年第1期11卷 5-11页

作者：谢振杰刘奕明罗友强尹小康数学工程与先进计算国家重点实验室(信息工程大学) 郑州450001 中国人民解放军78156部队重庆400039 中国人民解放军92330部队山东青岛266102 中国人民解放军32158部队新疆喀什844099

针对国密算法SM9的计算性能改进问题,提出2维Comb固定基模幂算法、预计算标量乘的拓展应用、针对常用ID优化等计算性能改进方法,理论分析和实验测试表明,所提方法通过预计算并增加可以接受的存储开销,能有效提升固定底数模幂、SM9算法3... 详细信息

针对国密算法SM9的计算性能改进问题,提出2维Comb固定基模幂算法、预计算标量乘的拓展应用、针对常用ID优化等计算性能改进方法,理论分析和实验测试表明,所提方法通过预计算并增加可以接受的存储开销,能有效提升固定底数模幂、SM9算法3个常见步骤等组件的计算性能.综合运用上述改进方法后,SM9数字签名的生成与验证、密钥交换、密钥封装、加密5项算法的性能提升幅度为14%~116%.

关键词：国密算法 SM9 计算性能预计算 Comb固定基

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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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