检索结果-南通市图书馆

Chinese Chemical Letters 2025年第2期36卷 389-393页

作者： Huashan Huang Jingze Chen Luyun Zhang Hong Yan Siqi Li Fen-Er Chen Institute of Pharmaceutical science and Technology College of Chemistry Fuzhou University Key Laboratory of Natural Medicines of the Changbai Mountain Ministry of Education Molecular Medicine Research Center College of Pharmacy Yanbian University Engineering Center of Catalysis and Synthesis for Chiral Molecules Department of Chemistry Fudan University Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs

A visible light-promoted fast photochemical Wolff rearrangement was developed toward synthesis of α-substituted amides in continuous flow with the use of a photochemical oscillatory flow reactor(POFR).The control experiment indicates that a fast process of the Wolff rearrangement(<40 s) is involved. Notably, this protocol does not require excess use of any reactants, and the resulting α-substituted amides could be isolated by recrystallization in good to excellent yields.

关键词： Flow photochemistry Ketene Oscillatory flow reactor Wolff rearrangement α-Substituted amides

Application of a multi-monitoring system and its temperature correction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain science 2025年第2期22卷 681-694页

作者： LIU Songyuan YANG Peixi HE ManChao TAO Zhigang State Key Laboratory for Tunnel Engineering China University of Mining and Technology-BeijingBeijing 100083China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China College of Mining Engineering North China University of Science and TechnologyTangshan 063210China

The Dazu Rock Carvings in Chongqing were inscribed on the World Heritage List in *** recent years,the Dazu Rock Carvings have faced environmental challenges such as geological forces,increased precipitation,pollution and tourism,which have led to rock deterioration and structural *** multi-source monitoring system for the protection of the rock carvings,based on the Internet of Things,includes Global Navigation Satellite System(GNSS)displacement monitoring,static level displacement monitoring,laser rangefinder displacement monitoring,roof pressure sensor monitoring and environmental damage *** paper analyses data from each sub-monitoring system within the multi-source monitoring system applied to Yuanjue Cave in the Dazu Rock ***,a correlation analysis between climate monitoring data and roof displacement data was carried out to assess the effect of *** on the results of the analysis,a temperature correction equation for the laser rangefinder was derived to improve the laser rangefinder displacement monitoring *** improved system was then used to monitor Cave 168,revealing the deformation and erosion patterns of the *** research results demonstrate that the multiparameter monitoring system is capable of accurately measuring and analyzing the stability of the Dazu stone carvings,as well as the effects of environmental conditions on *** use of the Internet of Things(IoT)and real-time data collection to monitor rock deformation and environmental conditions is an innovative application of technology in cultural heritage *** of the monitoring system and statistical correlation analysis of temperature and laser rangefinder data highlight the thoroughness of the methodology in this paper and its relevance to sustainable mountain *** the future,multi-source monitoring systems will have a broader application in the conservation of other UNESCO World Heritage Sites.

关键词： Multi-source Monitoring System Data Fitting Dazu Rock Carvings Rock Cave Protection

Combining machine learning algorithms with traditional methods for resolving the atomic-scale dynamic structure of monolayer MoS_(2) in high-resolution transmission electron microscopy

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2025年第1期34卷 162-170页

作者： Yu Meng Shuya Wang Xibiao Ren Han Xue Xuejun Yue Chuanhong Jin Shanggang Lin Fang Lin Department of Applied Physics College of Electronic EngineeringSouth China Agricultural UniversityGuangzhou 510642China State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Materials sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA

High-resolution transmission electron microscopy(HRTEM)promises rapid atomic-scale dynamic structure ***,the precision limitations of aberration parameters and the challenge of eliminating aberrations in Cs-corrected transmission electron microscopy constrain resolution.A machine learning algorithm is developed to determine the aberration parameters with higher precision from small,lattice-periodic crystal *** proposed algorithm is then validated with simulated HRTEM images of graphene and applied to the experimental images of a molybdenum disulfide(MoS_(2))monolayer with 25 variables(14 aberrations)resolved in wide *** these measured parameters,the phases of the exit-wave functions are reconstructed for each image in a focal series of MoS_(2)*** images were acquired due to the unexpected movement of the specimen ***-dimensional data extraction reveals time-varying atomic structures and *** particular,the atomic evolution of the sulfur-vacancy point and line defects,as well as the edge structure near the amorphous,is visualized as the resolution has been improved from about 1.75?to 0.9 *** method can help salvage important transmission electron microscope images and is beneficial for the images obtained from electron microscopes with average stability.

关键词： aberration measurement high-resolution transmission electron microscopy feature-extraction networks exit-wave reconstruction monolayer MoS_(2)

Life cycle dynamic formation temperature response and thermal energy extraction of mine geothermal system considering groundwater flow

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining science and Technology 2025年第1期35卷 1-17页

作者： Xibing Li Zhiying Chen Linqi Huang Botao Li Jingyi Yan Peilei Zhang Zhixiang Liu School of Resources and Safety Engineering Central South UniversityChangsha 410083China School of Safety science and Engineering Henan Polytechnic UniversityJiaozuo 454003China

As mining activities expand deeper,deep high-temperature formations seriously threaten the future safe exploitation,while deep geothermal energy has great potential for *** the formation cooling and geothermal mining in mines to establish a thermos-hydraulic coupling numerical model for fractured *** study investigates the formation heat transfer behaviour,heat recovery performance and thermal economic benefits influenced during the life *** results show that the accumulation of cold energy during the cold storage phase induces a decline in formation *** heat recovery phase is determined by the extent of the initial cold domain,which contracts inward from the edge and decelerates the heat recovery rate *** groundwater velocity increases,the thermal regulation efficiency gradually increases,the production temperature decreases,while the effective radius and thermal power increase first and then *** injected volume and temperature significantly affect,with higher injection temperatures slowing thermal recovery,and the thermal regulation efficiency is more sensitive to changes in formation permeability and thermal *** heat extraction performance is positively correlated with all *** levelized cost of electricity is estimated at 0.1203$/(kW·h)during the cold *** the heat recovery,annual profit is primarily driven by cooling benefits.

关键词： Mine geothermal energy Formation heat transfer behavior Groundwater flow Life cycle assessment Thermal economic analysis

Unraveling the significance of cobalt on transformation kinetics,crystallography and impact toughness in high-strength steels

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 380-390页

作者： Yishuang Yu Jingxiao Zhao Xuelin Wang Hui Guo Zhenjia Xie Chengjia Shang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Materials science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This work reveals the significant effects of cobalt(Co)on the microstructure and impact toughness of as-quenched highstrength steels by experimental characterizations and thermo-kinetic *** results show that the Co-bearing steel exhibits finer blocks and a lower ductile-brittle transition temperature than the steel without ***,the Co-bearing steel reveals higher transformation rates at the intermediate stage with bainite volume fraction ranging from around 0.1 to *** improved impact toughness of the Co-bearing steel results from the higher dense block boundaries dominated by the V1/V2 variant ***,the addition of Co induces a larger transformation driving force and a lower bainite start temperature(BS),thereby contributing to the refinement of blocks and the increase of the V1/V2 variant *** findings would be instructive for the composition,microstructure design,and property optimization of high-strength steels.

关键词： high-strength steel cobalt transformation kinetics crystallography impact toughness

Excellent high-temperature strength of(HfZrTiTaNb)C high-entropy carbide diffusion-bonded joint via in-situ alloying of Ni/Nb/Ni composite interlayer

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2025年第1期14卷 127-133,136-139页

作者： Ruijie Mu Ying Wang Shiyu Niu Kongbo Sun Zhenwen Yang Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and EngineeringTianjin UniversityTianjin 300350China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin 300350China

To obtain high-entropy carbide(HEC)joints with excellent high-temperature performance,a(HfZrTiTaNb)C HEC joint featuring a direct diffusion-bonded interface with a Nb-based interlayer was successfully fabricated at relatively low temperatures of 1150–1250℃for 60 min under 10 *** from a modified Ni/Nb/Ni composite interlayer with a Nb content of>64 at%,an alloyed Nb2Ni layer was constructed in situ by accelerating the directional diffusion of Ni atoms from the high-entropy interface into the remaining pure Nb through the Ni‒Nb eutectic ***,the excess liquid phase was squeezed out of the bonding region,ensuring the absence of Ni-based *** the intrinsic interfacial stability and sluggish diffusion effect,the HEC with its original lattice structure,was capable of developing diffusion bonding with the Nb2Ni layer instead of interacting with the liquid *** high reliability of the HEC/Nb2Ni bonded interface was confirmed by the coherence of(11¯3)HEC//(141)Nb2Ni and a calculated lattice misfit of *** HEC joint had a high room-temperature strength of 174 MPa because of the homogenous Nb2Ni layer,which exhibited nanohardness(15.2±1.5 GPa)and an elastic modulus of 219.9±17.5 ***,the strength of the HEC joint did not decrease at 1000℃,increasing by~49%over that of HEC/Ni/HEC diffusion-bonded joints,which have stringent surface flatness *** suggested that the HEC/Nb2Ni interface had excellent resistance to high-temperature softening,even though it was invariably the initial failure *** work is informative for designing bonding structures and preparing HEC components.

关键词： high-entropyceramic diffusionbonding insitualloyed interlayer mechanical properties

Insight into the activation of peroxymonosulfate by N-doped copper-based carbon for efficient degradation of organic pollutants:Synergy of nonradicals

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2025年第1期36卷 513-520页

作者： Mengmeng Ao Jian Wei Chuan-Shu He Heng Zhang Zhaokun Xiong Yonghui Song Bo Lai College of Environmental sciences Liaoning UniversityShenyang 110036China State Key Laboratory of Hydraulics and Mountain River Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China

The contamination of water resources by phenolic compounds(PCs)presents a significant environmental hazard,necessitating the development of novel materials and methodologies for effective *** this study,a metallic copper-doped zeolitic imidazolate framework was pyrolyzed and designated as CuNC-20 for the activation of peroxymonosulfate(PMS)to degrade phenol(PE).Cu-NC-20 could effectively address the issue of metal agglomeration while simultaneously diminishing copper dissolution during the activation of PMS *** Cu-NC-20 catalyst exhibited a rapid degradation rate for PE across a broad pH range(3-9)and demonstrated high tolerance towards coexisting *** to scavenger experiments and electron paramagnetic resonance analysis,singlet oxygen(^(1)O_(2))and high-valent copperoxo(Cu(Ⅲ))were the predominant reactive oxygen species,indicating that the system was nonradicaldominated during the degradation *** quantitative structure-activity relationship(QSAR)between the oxidation rate constants of various substituted phenols and Hammett constants was *** indicated that the Cu-NC-20/PMS system had the optimal oxidation rate constant withσ^(-)correlation and exhibited a typical electrophilic reaction *** study provides a comprehensive understanding of the heterogeneous activation process for the selective removal of phenolic compounds.

关键词： N-doped copper-based carbon Phenolic compounds Peroxymonosulfate Nonradical pathway Quantitative structure-activity relationship(QSAR)

CO_(2)-mediated bicarbonate conversion to concentrated formate in a CEM-based electrolyzer

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 605-611页

作者： Haocheng Xiong Donghuan Wu Haonan Li Andrew Li Qikun Hu Siyao Song Bingjun Xu Qi Lu State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China Ordos Laboratory Inner Mongolia 017000China

Renewable energy-driven bicarbonate conversion to valuable chemicals presents an attractive strategy for mitigating CO_(2)emissions,as bicarbonate can be efficiently generated from the capture of atmospheric CO_(2)using alkaline solutions with reactive *** this work,we present a CO_(2)-mediated bicarbonate conversion to pure formate using a cation exchange membrane-based electrolyzer with a 25 cm^(2)electrode *** electrolysis achieved selectivities exceeding 75%for formate at a total current of 2.5 A,achieving formate concentrations up to 1.2 M and yields as high as 95%over extended *** techno-economic assessment confirmed the economic viability of the process,highlighting the potential for bicarbonate electrolysis as a sustainable method for producing valuable chemicals.

关键词： Electrocatalysis Techno-economic assessments Electrochemistry Flow electrolyzer

Enhanced battery life prediction with reduced data demand via semi-supervised representation learning

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第2期101卷 524-534页

作者： Liang Ma Jinpeng Tian Tieling Zhang Qinghua Guo Chi Yung Chung School of Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Department of Electrical and Electronic Engineering and Research Centre for Grid Modernisation The Hong Kong Polytechnic University Photonics Research Institute The Hong Kong Polytechnic University School of Electrical Computer and Telecommunications Engineering University of Wollongong

Accurate prediction of the remaining useful life(RUL) is crucial for the design and management of lithium-ion *** various machine learning models offer promising predictions,one critical but often overlooked challenge is their demand for considerable run-to-failure data for *** of such training data leads to prohibitive testing efforts as the run-to-failure tests can last for ***,we propose a semi-supervised representation learning method to enhance prediction accuracy by learning from data without RUL *** approach builds on a sophisticated deep neural network that comprises an encoder and three decoder heads to extract time-dependent representation features from short-term battery operating data regardless of the existence of RUL *** approach is validated using three datasets collected from 34 batteries operating under various conditions,encompassing over 19,900 charge and discharge *** method achieves a root mean squared error(RMSE)within 25 cycles,even when only 1/50 of the training dataset is labelled,representing a reduction of 48%compared to the conventional *** also demonstrate the method's robustness with varying numbers of labelled data and different weights assigned to the three decoder *** projection of extracted features in low space reveals that our method effectively learns degradation features from unlabelled *** approach highlights the promise of utilising semi-supervised learning to reduce the data demand for reliability monitoring of energy devices.

关键词： Lithium-ion batteries Battery degradation Remaining useful life Semi-supervised learning

In-situ Si particle-reinforced joints of hypereutectic Al−60Si alloys by ultrasonic-assisted soldering

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2025年第1期35卷 77-90页

作者： Yuan-xing LI Xiang-bo ZHENG Chao-zheng ZHAO Zong-tao ZHU Yu-jie BAI Hui CHEN Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China

To improve the wettability of hypereutectic Al−60Si alloy and enhance the mechanical properties of the joints,Al−60Si alloy was joined by ultrasonic soldering with Sn-9Zn solder,and a sound joint with in-situ Si particle reinforcement was *** oxide film of Al−60Si alloy at the interface was identified by transmission electron microscopy(TEM)analysis as amorphous Al_(2)O_(3).The oxide of Si particles in the base metal was also *** oxide film of Al−60Si alloy was observed to be removed by ultrasonic vibration instead of holding *** particle-reinforced joints(35.7 vol.%)were obtained by increasing the ultrasonication *** maximum shear strength peaked at 99.5 MPa for soldering at 330℃with an ultrasonic vibration time of 50 s.A model of forming of Si particles reinforced joint under the ultrasound was proposed,and ultrasonic vibration was considered to promote the dissolution of Al and migration of Si particles.

关键词： hypereutectic Al−60Si alloy ultrasonic-assisted soldering Si particle reinforcement Sn−9Zn solder