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Landslide model tests with a miniature 2D principal stress sensor

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Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 94-105页

作者： Kun Fang Yulei Fu Huiming Tang Tangzhe Gao Pengju An qiong Wu Faculty of Engineering China University of GeosciencesWuhan430074China Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan430074China Institute of Rock Mechanics Ningbo UniversityNingbo315211China

Understanding the stress distribution derived from monitoring the principal stress(PS)in slopes is of great *** this study,a miniature sensor for quantifying the two-dimensional(2D)PS in landslide model tests is *** fundamental principle and design of the sensor are *** sensor comprises three earth pressure gages and one gyroscope,with the utilization of three-dimensional(3D)printing *** difficulties of installation location during model preparation and sensor rotation during testing can be effectively overcome using this *** different arrangements of the sensors are tested in verification ***,the application of the sensor in an excavated-induced slope model is *** results demonstrate that the sensor exhibits commendable performance and achieves a desirable level of accuracy,with a principal stress angle error of±5°in the verification *** stress transformation of the slope model,generated by excavation,is demonstrated in the application test by monitoring the two miniature principal stress(MPS)*** sensor has a significant potential for measuring primary stress in landslide model tests and other geotechnical model experiments.

关键词： Landslide Model test Principal stress(PS) Stress measurement

Broadband low-frequency sound absorption of multifunctional composite metastructure

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Science China(Technological Sciences) 2025年第2期68卷 114-124页

作者： Yilong yang Shanshan LIU yan LI Tong GAO Yongdong PAN Yong LI Yabin JIN School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China State International Joint Research Center of Aerospace Design and Additive Manufacturing Northwestern Polytechnical UniversityXi’an 710072China Institute of Acoustics School of Physics Science and EngineeringTongji UniversityShanghai 200092China Shanghai Key Laboratory of Intelligent Sensing and Detection Technology School of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China Shanghai Institute of Aircraft Mechanics and Control Shanghai 200092China

In this study,we fabricated multifunctional metastructures from carbon fiber-reinforced plastic composites using additive manufacturing *** metastructures are characterized by their lightweight,load-bearing capacity,and broadband low-frequency sound absorption *** metastructure consists of 36 unit cells,and non-local coupling mechanism was considered for designing the sound absorption *** developed an acoustic impedance theory tailored for the metastructure,facilitating an analysis of thermal and viscous dissipation *** is proven theoretically and experimentally that the proposed composite metastructure can achieve a noise reduction with an average sound absorption coefficient greater than 0.9 across frequencies in the rage of 330-1500 *** also studied the metastructure’s quasi-static and cyclic compression performance,confirming its efficient absorption capabilities after cyclic *** proposed design and additive manufacturing method for composite metastructures provides a novel pathway for creating lightweight,multifunctional structures with diverse applications,such as aerospace engineering.

关键词： composite metastructure broadband sound absorption additive manufacturing

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Petrogenesis of rodingites along the northern margin of the North China Craton: Constraints from zirconology and whole-rock geochemistry

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Science China Earth Sciences 2025年第3期68卷 750-767页

作者： Jing RAN Hao WANG Jinhui yang Yaoqi yan Yusheng ZHU Baoquan ZHOU State Key Laboratory of Lithospheric and Environmental Coevolution Institute of Geology and Geophysics Chinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences

Rodingite is a metasomatic product formed from various rock types by aqueous fluids, providing a direct record of lithosphere-hydrosphere interactions and serving as a key carrier of surface water into Earth's deep interior（water content >1.5wt.%）. Determining the properties of metasomatic fluids is crucial for understanding the petrogenesis of rodingites. In this study,we conducted a detailed study of mineral inclusions, U-Pb ages, trace elements, and Hf-O isotopes of zircon, as well as wholerock geochemical and Sr-Nd-Hf isotopic data on rodingites and associated felsic alkaline veins/dikes along the northern margin of the North China Craton（NMNCC）, with aims to elucidate their formation ages, petrogenesis, and geodynamic settings. The results show that zircons from syenite and albite syenite veins/dikes exhibit clear oscillatory zoning, a wide range of Th/U ratios（0.0001–4.073）, low concentrations of rare-earth elements（REEs）, and low crystallization temperatures（<600°C）. These characteristics suggest that the zircons crystallized from fluids separated from late-stage melts during magma evolution. Consequently, the zircon U-Pb ages obtained through Secondary Ion Mass Spectrometry（SIMS） and Laser Ablation Inductively Coupled Plasma Mass Spectrometry（LA-ICPMS） analyses（389.1±3.5 to 390.2±1.6 Ma） record the timing of hydrothermal fluid activity. Zircons within the rodingites contain grandite, hematite, and aqueous fluid inclusions, indicating their formation during rodingitization, with an oxidizing, water-rich fluid acting as the metasomatic agent. SIMS and LA-ICPMS analyses of these zircons yielded U-Pb ages of 388.1±3.9 and 388.6±4.6 Ma, which register the formation ages of the rodingites. Both the syenite and albite syenite samples display high total alkali contents（9.9–13.9 wt.%）, consistent initial Sr isotopic ratios（0.7047–0.7051）,negative εNd（t）(-10.1 to-8.5) and εHf（t）(-13.9 to-13.7) values, and slightly elevated zircon δ18O values（6.20‰±0.18‰）compared to ma

关键词： North China Craton Rodingite Syenite Inclusions Zircon U-Pb age Sr-Nd-Hf-O isotopes

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Efficacy and Safety of Zihua Wenfei Zhisou Granule in Treatment of Postinfectious Cough: A Multicenter, Randomized, Double-Blind, Placebo-Controlled, Phase Ⅱ Clinical Trial

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Chinese Journal of Integrative Medicine 2025年第1期31卷 3-10页

作者： LI Ting LIU Xue-mei yang Mei WU yan-qing LIU Wei MAO Bing JIANG Hong-li Division of Pulmonary Medicine Department of Internal MedicineInstitute of Integrated Traditional Chinese and Western MedicineWest China HospitalSichuan UniversityChengdu610041China Department of Pulmonary Diseases State Key Laboratory of Biotherapy of ChinaWest China HospitalSichuan UniversityChengdu610041China

Objective: To evaluate the efficacy and safety of Chinese medicine(CM) Zihua Wenfei Zhisou Granule(ZWZG) in postinfectious cough(PIC) patients with CM syndrome of wind-cold invading Fei(Lung,WCIF). Methods: This is a multicenter, randomized, double-blind, parallel-group, placebo-controlled phase Ⅱclinical trial. PIC patients with WCIF syndrome were recruited from the Respiratory Departments in 6 hospitals across China between March 2019 and December 2020. Eligible patients were randomly assigned to group A(ZWZG-matched placebo 15 g), group B(active ZWZG 15 g), and group C(active ZWZG 10 g plus ZWZGmatched placebo 5 g) in a 1:1:1 ratio. All medications were taken orally 3 times daily for 14 consecutive days. The primary outcomes were cough relief rate and cough disappearance rate. The secondary outcomes included time to cough relief, time to cough disappearance, and changes in cough symptom score(CSS), cough Visual Analog Scale(VAS) value, Cough-Specific Quality of Life Questionnaire(CQLQ) score, and CM syndrome score from baseline(day 0) to post-treatment(day 14). Adverse events(AEs) in each group were recorded. Results: A total of 198 patients were included in the full analysis set(FAS) and safety analysis set(SS), while 183 were enrolled in the per-protocol analysis set(PPS). In the FAS population, the cough relief rate was 47.76%, 90.77% and 84.85%in groups A, B, and C, respectively;while the cough disappearance rate was 31.34%, 72.31% and 68.18%,respectively. The cough relief rates and cough disappearance rates in groups B and C were significantly higher than group A(P<0.0001). Both the median time to cough relief and cough disappearance in groups B and C were shorter than group A(P<0.0001). Compared with group A, groups B and C showed significantly greater improvements from baseline to post-treatment in CSS during daytime and nighttime as well as VAS(P<0.05).There were no significant differences in changes from baseline to post-treatment in CQLQ and CM syndrome

关键词： postinfectious cough Zihua Wenfei Zhisou Granule randomized controlled trial Chinese medicine

Thermal effects on the strain rate-dependent behavior of highly compacted GMZ01 bentonite

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Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 453-464页

作者： Pengju Qin Weimin Ye qiong Wang Yonggui Chen College of Civil Engineering Taiyuan University of TechnologyTaiyuan030024China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China

Investigation of thermal effects on the strain rate-dependent properties of compacted bentonite is crucial for the long-term safety assessment of deep geological repository for disposal of high-level radioactive *** the present work,cylindrical GMZ01 bentonite specimens were compacted with suction-controlled by the vapor equilibrium ***,a series of temperature-and suction-controlled stepwise constant rate of strain(CRS)tests was performed and the rate-dependent compressibility behavior of the highly compacted GMZ01 bentonite was *** plastic compressibility parameterλ,the elastic compressibility parameterκ,the yield stress p0,as well as the viscous parameterαwere *** indicate thatλ,κandαdecrease and p0 increases as suction *** heating,parametersλ,αand p0 *** is also found that p0 increases linearly with increasing CRS in a double-logarithm *** on the experimental results,a viscosity parameterα(s,T)was fitted to capture the effects of suction s and temperature T on the relationship between yield stress and strain ***,an elastic-thermo-viscoplastic model for unsaturated soils was developed to describe the thermal effects on the rate-dependent behavior of highly compacted GMZ01 *** showed that the calculated results agreed well to the measured ones.

关键词： Highly compacted bentonite Rate-dependent behavior Constant rate of strain Temperature Elastic-thermo-viscoplastic model

Support effect and confinement effect of porous carbon loaded tin dioxide nanoparticles in high-performance CO_(2) electroreduction towards formate

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Chinese Chemical Letters 2025年第1期36卷 597-602页

作者： Xingxing Jiang Yuxin Zhao yan Kong Jianju Sun Shangzhao Feng Xin Lu Qi Hu Hengpan yang Chuanxin He College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China

Leveraging the interplay between the metal component and the supporting material represents a cornerstone strategy for augmenting electrocatalytic efficiency,e.g.,electrocatalytic CO_(2)reduction reaction(CO_(2)RR).Herein,we employ freestanding porous carbon fibers(PCNF)as an efficacious and stable support for the uniformly distributed SnO_(2)nanoparticles(SnO_(2)PCNF),thereby capitalizing on the synergistic support effect that arises from their strong *** one hand,the interaction between the SnO_(2)nanoparticles and the carbon support optimizes the electronic configuration of the active *** interaction leads to a noteworthy shift of the d-band center toward stronger intermediate adsorption energy,consequently lowering the energy barrier associated with CO_(2)*** a result,the Sn O_(2)PCNF realizes a remarkable CO_(2)RR performance with excellent selectivity towards formate(98.1%).On the other hand,the porous carbon fibers enable the uniform and stable dispersion of SnO_(2)nanoparticles,and this superior porous structure of carbon supports can also facilitate the exposure of the SnO_(2)nanoparticles on the reaction interface to a great ***,adequate contact between active sites,reactants,and electrolytes can significantly increase the metal utilization,eventually bringing forth a remarkable7.09 A/mg mass *** work might provide a useful idea for improving the utilization rate of metals in numerous electrocatalytic reactions.

关键词： CO_(2)electroreduction Support effect Porous carbon fiber Formate Mass activity

Recent progress on photoactive nonprecious transition-metal complexes

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Science China Chemistry 2025年第1期68卷 46-95页

作者： Zhong-Liang Gong Hong-Jie Zhang yan Cheng Jianxun Liu Yuhan Ai Yaqin Li Zhihui Feng qiong Zhang Shaolong Gong Yong Chen Chang-Jiang Yao Yuan-Yuan Zhu Liang-Jin Xu Yu-Wu Zhong CAS Key Laboratory of Photochemistry Institute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory of Structural Cemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China School of Chemistry and Chemical Engineering Anhui Key Laboratory of Advanced Catalytic Materials and Reaction EngineeringHefei University of TechnologyHefei 230009China State Key Laboratory of Explosion Science and Safety Protection School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing 100081China College of Chemistry and Molecular Sciences Hubei Key Lab on Organic and Polymeric Optoelectronic MaterialsWuhan UniversityWuhan 430072China School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601China Key Laboratory of Photochemical Conversion and Optoelectronic Materials&CAS-HKU Joint Laboratory on New Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Photoactive complexes of nonprecious transition metals,mainly including those in the first-row and partially the second-row of the Periodic table of elements,have received increasing attention in view of their low cost and long-term *** are recognized as promising alternatives to noble transition metal complex congeners that have been extensively studied in optoelectronic devices,artificial photosynthesis,photocatalysis,biodiagnostics,and therapeutics,*** review is devoted to a comprehensive summary on the classical and recent advances on photoactive nonprecious transition metal complexes,including photoactive Zr,V,Cr,Mo,and W complexes,Mn complexes and hybrids,Fe,Co,Ni,and Cu complexes,and Zn and Cd complexes and hybrids.A particular focus is given on the molecular design,modulation of photophysical and photochemical properties,and applications of the representative and lately-developed nonprecious metal *** addition,a perspective on the future development in this field is provided at the end of this review.

关键词： photoactive metal complexes earth-abundant metals nonprecious metal complexes luminescence photochemistry

The machine learning implementation and theoretical foundations of intelligent control of accelerator particle beams

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Science China(Physics,Mechanics & Astronomy) 2025年第2期68卷 199-200页

作者： XueQing yan State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China

The intelligent control of accelerator particle beams,achieved through machine learning,offers a new opportunity for the design and regulation of high-power,high-intensity *** recent years,this technology has been applied in several practical *** instance,the DeepMind team successfully used reinforcement learning to control the plasma in a Tokamak device with 19 control magnets[1].

关键词： particle instance accelerator

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Revisit the Gibbs-Thomson Equation Fitting of Poly(butylene succinate)Based on Oligomer Extended-Chain Crystals

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Chinese Journal of Polymer Science 2025年第2期43卷 392-398页

作者： Na Li Yu-Pei Tian Tian-Yu Wu qiong Zhou Hai-Mu Ye College of New Energy and Materials China University of PetroleumBejing 102249China

The equilibrium melting point(T_(m)^(0))is a crucial thermodynamic parameter for characterizing the crystallization and melting behavior of semi-crystalline ***,the direct measurement of T_(m)^(0) poses a significant challenge because of the difficulty in physically fabricating fully-extended chain crystals of high-molecular-weight ***,various extrapolation equations for T_(m)^(0) have been proposed that utilize the thermal properties of ordinary folded-chain *** these,the Gibbs-Thomson equation is one of the most commonly employed for *** its widespread use,there are notable variations in the T_(m)^(0) values obtained by different research groups,even when based on similar *** raises questions about the validity and accuracy of using the Gibbs-Thomson equation to linearly extrapolate T_(m)^(0).In this study,we prepared a series of oligomer extended-chain crystals(ECCs)of poly(butylene succinate)(PBS)and used their properties for Gibbs-Thomson *** results reveal a perfect linear relationship,with an extrapolated T_(m)^(0) value of 136.08℃.The basal surface free energy of the oligomer ECCs was calculated as 0.084 J/m^(2),which is approximately twice that of folded-chain *** difference is attributed to the aggregation of highly mobile free tails on the crystal *** two structural features of oligomer ECCs—large thickness and fixed surface—better fulfill the conditions for applying the Gibbs-Thomson equation,ensuring its validity and ***,we believe that the Gibbs-Thomson fit can produce reliable results when sufficient high-quality data are used.

关键词： Equilibrium melting point Extended-chain crystal Gibbs-Thomson equation Inclusion complex