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Interpretable Machine Learning Method for Compressive Strength Prediction and Analysis of Pure Fly Ash-based Geopolymer Concrete

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 65-78页

作者： SHI Yuqiong li Jingyi ZHANG Yang li li Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education Northwest A&F Uni-versityYangling 712100China College of Water Resources and Architectural Engineering Northwest A&F UniversityYangling 712100China Chongqing Key Laboratory of Public Big Data Security Technology Chongqing 401420China Chongqing College of Mobile Communication Chongqing 401520China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina National Rail Transit Electrification and Automation Engineering Technology Research Center(Hong Kong Branch) The Hong Kong Polytechnic UniversityKowloonHung HomHong KongChina

In order to study the characteristics of pure fly ash-based geopolymer concrete(PFGC)conveniently,we used a machine learning method that can quantify the perception of characteristics to predict its compressive *** this study,505 groups of data were collected,and a new database of compressive strength of PFGC was *** order to establish an accurate prediction model of compressive strength,five different types of machine learning networks were used for comparative *** five machine learning models all showed good compressive strength prediction performance on *** them,R2,MSE,RMSE and MAE of decision tree model(DT)are 0.99,1.58,1.25,and 0.25,*** R2,MSE,RMSE and MAE of random forest model(RF)are 0.97,5.17,2.27 and 1.38,*** two models have high prediction accuracy and outstanding generalization *** order to enhance the interpretability of model decision-making,we used importance ranking to obtain the perception of machine learning model to 13 *** 13 variables include chemical composition of fly ash(SiO_(2)/Al_(2)O_(3),Si/Al),the ratio of alkaline liquid to the binder,curing temperature,curing durations inside oven,fly ash dosage,fine aggregate dosage,coarse aggregate dosage,extra water dosage and sodium hydroxide *** temperature,specimen ages and curing durations inside oven have the greatest influence on the prediction results,indicating that curing conditions have more prominent influence on the compressive strength of PFGC than ordinary Portland cement *** importance of curing conditions of PFGC even exceeds that of the concrete mix proportion,due to the low reactivity of pure fly ash.

关键词： machine learning pure fly ash geopolymer compressive strength feature perception

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基于相关指数分析增强的功能近红外光谱脑机接口

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科技导报 2017年第2期35卷 60-64页

作者：李喆张屾郑燕春汪待发马建爱王玲李德玉北京航空航天大学生物与医学工程学院北京100191 虚拟现实技术与系统国家重点实验室(北京航空航天大学) 北京100191

由于对运动伪迹不敏感、适合特殊人群和可穿戴式检测等优势,功能近红外光谱技术(fNIRS)在脑机接口(BCI)、心理认知等领域发挥着日益重要的作用。肢体运动想象是BCI在残疾人康复训练等领域应用的重要范式,伴随穿戴式fNIRS的发展,有望帮... 详细信息

由于对运动伪迹不敏感、适合特殊人群和可穿戴式检测等优势,功能近红外光谱技术(fNIRS)在脑机接口(BCI)、心理认知等领域发挥着日益重要的作用。肢体运动想象是BCI在残疾人康复训练等领域应用的重要范式,伴随穿戴式fNIRS的发展,有望帮助残疾人在家庭或社区开展长期脑康复训练。本文针对目前基于fNIRS的运动想象任务分类准确率普遍不高这一现状,应用基于Pearson积差相关系数的相关指数R^2,对被试进行个性化参数优化,期望改善运动想象的分类结果。实验采集了17名被试的左、右手运动想象任务期间大脑皮层主运动区的血红蛋白浓度变化数据,并采用支持向量机(SVM)分类。结果表明,经过R^2参数优化之后,分类准确率相对无优化情况显著提升,分类准确率在60%以上的被试比例由原本的58.8%提高到了94%,分类准确率在65%以上的被试比例由原本的41.2%提升到了64.7%。

关键词：功能近红外脑功能成像运动想象支持向量机相关指数分析

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Photo‑Energized MoS_(2)/CNT Cathode for High‑Performance li–CO_(2)Batteries in a Wide‑Temperature Range

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Nano-Micro Letters 2025年第1期17卷 160-175页

作者： Tingsong Hu Wenyi lian Kang Hu Qiuju li Xueliang Cui Tengyu Yao Laifa Shen jiangsu Key Laboratory of Materials and Technologies for Energy Storage College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China

li–CO_(2) batteries are considered promising energy storage systems in extreme environments such as Mars;however,severe performance degradation will occur at a subzero temperature owning to the sluggish reaction ***,a photo-energized strategy adopting sustainable solar energy in wide working temperature range li–CO_(2) battery was achieved with a binder-free MoS_(2)/carbon nanotube(CNT)photo-electrode as *** unique layered structure and excellent photoelectric properties of MoS_(2) facilitate the abundant generation and rapid transfer of photo-excited carriers,which accelerate the CO_(2) reduction and li_(2)CO_(3) decomposition upon *** illuminated battery at room temperature exhibited high discharge voltage of 2.95 V and mitigated charge voltage of 3.27 V,attaining superior energy efficiency of 90.2%and excellent cycling stability of over 120 *** at an extremely low temperature of−30℃,the battery with same electrolyte can still deliver a small polarization of 0.45 V by the photoelectric and photothermal synergistic mechanism of MoS_(2)/CNT *** work demonstrates the promising potential of the photo-energized wide working temperature range li–CO_(2) battery in addressing the obstacle of charge overpotential and energy efficiency.

关键词： li-CO_(2)batteries Photo-energized Wide operation-temperature Kinetics MoS_(2)

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非酒精性脂肪性肝病大鼠血管紧张素Ⅱ-1型受体表达

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肝脏 2011年第2期16卷 120-123页

作者：简玲丽张晓兰张志坚福建医科大学福总临床医学院福州350025 南京军区福州总医院消化内科

目的探讨血管紧张素Ⅱ-1型(AT1)受体在NAFLD发病机制中的作用。方法雄性SD大鼠32只随机分组,正常对照组、模型组各16只,适应性喂养1周后,模型组给予高脂饮食,正常对照组给予正常饮食,10周、14周后分两次平均处死各组8只大鼠,全自动生化... 详细信息

目的探讨血管紧张素Ⅱ-1型(AT1)受体在NAFLD发病机制中的作用。方法雄性SD大鼠32只随机分组,正常对照组、模型组各16只,适应性喂养1周后,模型组给予高脂饮食,正常对照组给予正常饮食,10周、14周后分两次平均处死各组8只大鼠,全自动生化分析仪测定肝功能、血脂,放射免疫计数器测定血管紧张素、醛固酮,运用免疫组织化学方法观察肝组织中AT1受体的表达。结果 10周末,模型组大鼠体质量增长高于正常对照组,14周末,模型组大鼠体质量增长低于正常对照组;10周、14周末模型组肝湿重、血清丙氨酸氨基转移酶(ALT)、总胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白(LDL)、血管紧张素(AⅡ)浓度值均高于正常对照组;模型组大鼠高密度脂蛋白(HDL)均低于正常对照组;10周末时模型组AⅠ、AⅡ均较正常对照组升高,AⅠ在两组差异不具有统计学意义(P>0.05),14周末时模型组AⅠ、AⅡ均较正常对照组升高,差异具有统计学意义;模型组ALD均较正常对照组降低,差异不具有统计学意义;模型组有AT1受体表达,且14周时表达量高于10周时,正常对照组几乎不表达。结论 AT1受体在非酒精性脂肪性肝病大鼠肝组织中表达,且随着脂肪肝程度的加重表达量有所增加。

关键词：脂肪肝血管紧张素大鼠

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Constraints on holographic QCD phase transitions from PTA observations

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 71-78页

作者： Song He li li Sai Wang Shao-jiang Wang Center for Theoretical Physics and College of Physics Jilin University School of Physical Science and Technology Ningbo University Max Planck Institute for Gravitational Physics (Albert Einstein Institute) CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences (UCAS) School of Physical Sciences University of Chinese Academy of Sciences (UCAS) Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences

The underlying physics of QCD phase transition in the early Universe remains largely unknown due to its strong-coupling nature during the quark-gluon plasma/hadron gas transition, yet a holographic model has been proposed to quantitatively fit the lattice QCD data while with its duration of the first-order phase transition(FoPT) left undetermined. At specific baryon chemical potential, the first-order QCD phase transition agrees with the observational constraint of baryon asymmetry. It, therefore, provides a scenario for phase transition gravitational waves(GWs) within the standard model of particle physics. If these background GWs could contribute dominantly to the recently claimed common-spectrum red noise from pulsar timing array(PTA) observations, the duration of this FoPT can be well constrained, and the associated primordial black holes are still allowed by current observations.

关键词： pulsar timing array QCD phase transition gravitational waves primordial black holes

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蓝舌病1型病毒VP7蛋白表(拟)位定位及免疫检测分析

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中国畜牧兽医 2017年第1期44卷 236-241页

作者：熊和丽李国华王金萍苗海生宋建领李华春云南省热带亚热带动物病毒病重点实验室昆明650224 墨江县动物疫病预防控制中心墨江654800

为研究蓝舌病1型病毒VP7蛋白关键性氨基酸表位定位,本试验应用抗蓝舌病1型病毒VP7蛋白单克隆抗体淘选噬菌体展示的7肽随机肽库,对筛选的共有序列噬菌体扩增纯化,通过EliSA、竞争性EliSA分析共有噬菌体拟位与蓝舌1型病毒VP7蛋白单克隆抗... 详细信息

为研究蓝舌病1型病毒VP7蛋白关键性氨基酸表位定位,本试验应用抗蓝舌病1型病毒VP7蛋白单克隆抗体淘选噬菌体展示的7肽随机肽库,对筛选的共有序列噬菌体扩增纯化,通过EliSA、竞争性EliSA分析共有噬菌体拟位与蓝舌1型病毒VP7蛋白单克隆抗体的免疫反应性。结果表明,含有LNWPMVR基序的噬菌体拟位能够与蓝舌病1型病毒VP7蛋白单克隆抗体发生特异性结合,并且此结合能被蓝舌病1型病毒抑制或阻断,表明噬菌体7肽模拟了BTV蛋白上与蓝舌病1型病毒VP7蛋白单克隆抗体结合的抗原决定簇,提示蓝舌病病毒VP7蛋白的第163-189位氨基酸(LNAGARGDVQQIFQGRNDPMMIYLVWR)构成蓝舌病病毒VP7蛋白特异性表位。

关键词：蓝舌病病毒 VP7蛋白表位

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Correlation between the rock mass properties and maximum horizontal stress:A case study of overcoring stress measurements

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 39-48页

作者： Peng li Meifeng Cai Shengjun Miao Yuan li Yu Wang Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou 221116China

Understanding the mechanical properties of the lithologies is crucial to accurately determine the horizontal stress *** investigate the correlation between the rock mass properties and maximum horizontal stress,the three-dimensional(3D)stress tensors at 89 measuring points determined using an improved overcoring technique in nine mines in China were adopted,a newly defined characteristic parameter C_(ERP)was proposed as an indicator for evaluating the structural properties of rock masses,and a fuzzy relation matrix was established using the information distribution *** results indicate that both the vertical stress and horizontal stress exhibit a good linear growth relationship with *** is no remarkable correlation between the elastic modulus,Poisson's ratio and depth,and the distribution of data points is scattered and ***,there is no obvious relationship between the rock quality designation(RQD)and *** maximum horizontal stress σ_(H) is a function of rock properties,showing a certain linear relationship with the C_(ERP)at the same *** addition,the overall change trend of σ_(H) determined by the established fuzzy identification method is to increase with the increase of C_(ERP).The fuzzy identification method also demonstrates a relatively detailed local relationship betweenσ_H and C_(ERP),and the predicted curve rises in a fluctuating way,which is in accord well with the measured stress data.

关键词： overcoring stress measurements elastic modulus Poisson's ratio rock quality designation maximum horizontal stress fuzzy identification

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Manufacturing N,O-carboxymethyl chitosan-reduced graphene oxide under freeze-dying for performance improvement of li-S battery

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International Journal of Extreme Manufacturing 2023年第1期5卷 282-305页

作者： Zhibin jiang Lujie Jin Xiying jian Jinxia Huang Hongshuai Wang Binhong Wu Kang Wang ling Chen Youyong li Xiang liu Weishan li School of Chemistry Engineering Research Center of MTEES(Ministry of Education)Research Center of BMET(Guangdong Province)Engineering Laboratory of OFMHEB(Guangdong Province)Key Laboratory of ETESPG(GHEI)and Innovative Platform for ITBMD(Guangzhou Municipality)South China Normal UniversityGuangzhouPeople’s Republic of China Shenzhen School Affiliated to Sun Yat-Sen University ShenzhenPeople’s Republic of China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhouPeople’s Republic of China Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyMacao SARPeople’s Republic of China College of Energy Science and Engineering Nanjing Tech UniversityNanjingPeople’s Republic of China

lithium-sulfur(li-S) batteries can provide far higher energy density than currently commercialized lithium ion batteries, but challenges remain before it they are used in *** of the challenges is the shuttle effect that originates from soluble intermediates, like lithium polysulfides. To address this issue, we report a novel laminar composite, N,O-carboxymethyl chitosan-reduced graphene oxide(CC-rGO), which is manufactured via the self-assembly of CC onto GO and subsequent reduction of GO under an extreme condition of 1 Pa and-50°C. The synthesized laminar CC-rGO composite is mixed with acetylene black(AB) and coated on a commercial polypropylene(PP) membrane, resulting in a separator(CC-rGO/AB/PP) that can not only completely suppress the polysulfides penetration, but also can accelerate the lithium ion transportation, providing a li-S battery with excellent cyclic stability and rate capability. As confirmed by theoretic simulations, this unique feature of CC-rGO is attributed to its strong repulsive interaction to polysulfide anions and its benefit for fast lithium ion transportation through the paths paved by the heteroatoms in CC.

关键词： composite manufacturing N O-carboxymethyl chitosan reduced graphene oxide separator lithium-sulfur battery

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Reversible li2C2O4 product regulation in li–CO2 batteries using single-atom alloy engineering

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Science China Chemistry 2025年

作者： Xinxin Zhang Yu Wang Yafei li jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University

The efficiency of lithium-carbon dioxide （li–CO2） batteries is limited by the sluggish generation/decomposition kinetics of the discharge products （i.e.,li2CO3and carbon） despite the use of state-of-the-art noble metal （NM） ***2C2O4has emerged as a promising alternative product;however,the thermodynamic instability of li2C2O4causes it to generally appear as an intermediate in li2CO3pathways rather than a product during ***,using comprehensive first-principles calculations,we report tailoring the discharge products of li–CO2batteries to li2C2O4via single-atom alloy （SAA） engineering,in which NM-doped copper SAAs （NM1Cu） are constructed for *** NM1Cu catalysts display a free-atom-like narrow d-band state and unique charge distribution over the solute NM1atom and the surrounding matrix Cu *** an optimized electronic structure is substantial in Ru1Cu and Ir1Cu,which is conducive to the co-activation and coupling of *** lithiation of*CO2intermediate that breaks the charge symmetry of the central C species can further reduce the kinetic barriers of the C–C *** advantages promote li2C2O4generation on Ru1Cu and Ir1Cu while suppress its subsequent ***,they exhibit low theoretical overpotentials and enable facile delithiation under normal charging *** work proposes a universal principle of manipulating electronic structures to achieve li2C2O4product,which provides practical guidance for the development of li–CO2batteries.

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Stepwise assembly to construct stable copper(I) cluster-based circularly polarized luminescent MOFs

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Science China Chemistry 2025年

作者： Jing-Wen Xie Meng-Ting Wang Yan Jin Si li jian-Hua Qin Shuang-Quan Zang Tomas C.W.Mak College of Chemistry Henan Key Laboratory of Crystalline Molecular Functional Materials Zhengzhou University College of Chemistry and Chemical Engineering Luoyang Normal University Department of Chemistry The Chinese University of Hong Kong

Circularly polarized luminescence （CPL） materials have been extensively studied in recent years owing to their widespread applications in 3D display,optical storage,optical anti-counterfeiting,and biological imaging,***（I） clusters have emerged as a promising candidate for CPL materials,driven by their cost-effectiveness,superior luminescent properties,precise structure,and low ***,the poor environmental stability of copper（I） clusters renders their synthesis and preservation challenging,thereby significantly impeding their ***,we have designed and synthesised a chiral double-coordinated ligand in order to construct copper（I） cluster nodes that can be further *** anticipated,by utilizing stepwise assembly strategy,a Cu4cluster node co-modified by chiral alkynyl ligands and triphenylphosphine was further assembled with Cd2+ions to obtain 2D layers structure,L/*** L/D-Cu4-Cd exhibits excellent stability and optical properties,including bright yellow emission,solvent-responsive luminescence,and CPL activity with a maximum glumup to 2.0×10-3,which shows potential applications in the WLED and *** interestingly,the material also exhibits deflection ability towards different wavelengths of linearly polarized light,showing certain potential in the preparation of circular polarizer.

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