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defects activation in CoFe-based metallic glasses during creep deformation

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Journal of Materials Science & Technology 2021年第10期69卷 42-47页

作者： Zhuwei Lv Chenchen yuan Haibo Ke Baolong shen School of Materials Science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing211189China Songshan Lake Materials Laboratory Dongguan523808China

Maxwell-Voigt model with two Kelvin units and one Maxwell unit was utilized to analyze the microalloying effect of Cu on the creep behavior of CoFe-based metallic glasses at different loading *** defect activation during creep deformation was detected by the relaxation time spectrum based on this *** defect,with respect to a short relaxation time in relaxation spectra,intends to be activated at a quasi-static loading mode in the alloy with 0.5 at.%Cu *** further increasing loading rates,more defects with a large size were provoked activated at both hard and soft regions in the Cu-containing sample.A softening with the reduction of elastic modulus and hardness about 10%and 15%,respectively,was also observed in the Cu-doped *** is consistent with the pronounced viscoplastic deformation of this alloy along with the decrease of *** work provides a microscopic insight into structural evolution during creep deformation in a Cu-doped metallic glass,which might help for understanding the plastic deformation of metallic glasses upon a minor addition.

关键词： Plasticity Creep Disordered Structure Metallic glasses

Growth process,defects,and dopants of bulk β-Ga_(2)O_(3) semiconductor single crystals

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China Foundry 2024年第5期21卷 491-506页

作者： Yan-shen Wang Ming-zhi Zhu yuan Liu School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology(Ministry of Education) Beijing 100084China

β-gallium oxide(β-Ga2O3),as the typical representative of the fourth generation of semiconductors,has attracted increasing attention owing to its ultra-wide bandgap,superior optical properties,and excellent tolerance to high temperature and *** to the single crystals of other semiconductors,high-quality and large-size β-Ga_(2)O_(3) single crystals can be grown with low-cost melting methods,making them highly *** this review,the growth process,defects,and dopants ofβ-Ga_(2)O_(3) are primarily ***,the growth process(e.g.,decomposition,crucible corrosion,spiral growth,and development)ofβ-Ga_(2)O_(3) single crystals are summarized and compared in ***,the defects of β-Ga_(2)O_(3) single crystals and the influence of defects on Schottky barrier diode(SBD)devices are emphatically ***,the influences of impurities and intrinsic defects on the electronic and optical properties ofβ-Ga_(2)O_(3) are also briefly *** this comprehensive analysis,the article offers a concise summary of the current state,challenges and prospects ofβ-Ga_(2)O_(3) single crystals.

关键词： β-Ga_(2)O_(3) single-crystal growth defects dopants semiconductor

Study on the effect of thermal deformation on the liquid seal of high-temperature molten salt pump in molten salt reactor

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Nuclear Science and Techniques 2023年第2期34卷 128-138页

作者： Xing‑Chao shen yuan Fu Jian‑Yu Zhang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

The high-temperature molten salt pump is the core equipment in a molten salt reactor that drives the flow of the molten salt *** stability is key to the continuous and reliable operation of the molten salt pump,and the liquid seal at the wear ring can affect the dynamic characteristics of the rotor *** the molten salt pump is operated in the hightemperature molten salt medium,thermal deformation of the submerged parts inevitably occurs,changing clearance between the stator and rotor,affecting the leakage and dynamic characteristics of the *** this study,the seal leakage,seal dynamic characteristics,and rotor system dynamic characteristics are simulated and analyzed using finite element simulation software based on two cases of considering the effect of seal thermal deformation effect or *** results show a significant difference in the leakage characteristics and dynamic characteristics of the seal obtained by considering the effect of seal thermal deformation and neglecting the effect of thermal *** leakage flow rate decreases,and the first-order critical speed of the seal-bearing-rotor system decrease after considering the seal’s thermal deformation.

关键词： High-temperature molten salt pump Seal thermal deformation Leakage characteristics Seal dynamic characteristics Critical speed

Evaluating the impacts of converting grain to vegetable fields on nitrate transport in the deep vadose zone of the North China Plain

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Journal of Geographical Sciences 2025年第1期35卷 189-212页

作者： LIU Meiying MIN Leilei WU Lin ZHANG Yucui QI Yongqing WANG Shiqin LIU Binbin GENG Di shen Yanjun Hebei Key Laboratory of Water-Saving Agriculture Key Laboratory of Agricultural Water ResourcesCenter for Agricultural Resources ResearchInstitute of Genetics and Developmental BiologyCAS School of Advanced Agricultural Sciences University of Chinese Academy of Sciences

Nitrate （NO3-） accumulation and transport processes in the thick vadose zone affect the evolution of the groundwater NO3-content in intensive agricultural *** land-use change （ALUC）,typically accompanied by substantial alterations in nitrogen fertilizer application and irrigation practices,is an important influencing *** study evaluated the changes in NO3-accumulation and transport in the deep vadose zone （DVZ,below the root zone）,and the groundwater NO3-content associated with ALUC from grain to vegetable fields in the North China Plain （NCP）.The ALUC from grain to vegetable resulted in nitrate–nitrogen （NO3--N） accumulation in DVZ increased by 235.5 kg ha-1m-1（163.2%） in the piedmont plain and 224.9 kg ha-1m-1（102.7%） in the central plain,*** change accelerated downward transport velocity in the DVZ (from 0.81±0.47 to 0.89±0.55 m yr-1in the piedmont plain,and from 0.24±0.12 to 0.92±0.12 m yr-1in the central plain) and increased NO3-leaching *** transport velocity and leaching fluxes resulted in chemical N-fertilizer entering the aquifer in several areas in the piedmont *** impact of the agricultural activity intensity changes,accompanied by the ALUC,on groundwater quantity and quality should be considered in similar regions.

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Online identification of time-varying dynamical systems for industrial robots based on sparse Bayesian learning

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Science China(Technological Sciences) 2022年第2期65卷 386-395页

作者： shen Tan DONG YunLong HE DingXin yuan Ye School of Artificial Intelligence and Automation Huazhong University of Science and TechnologyWuhan 430074China

Nowadays, industrial robots have been widely used in manufacturing, healthcare, packaging, and more. Choosing robots in these applications mainly attributes to their repeatability and precision. However, prolonged and loaded operations can deteriorate the accuracy and efficiency of industrial robots due to the unavoidable accumulated kinematical and dynamical errors. This paper resolves these aforementioned issues by proposing an online time-varying sparse Bayesian learning(SBL) method to identify dynamical systems of robots in real-time. The identification of dynamical systems for industrial robots is cast as a sparse linear regression problem. By constructing the dictionary matrix, the parameters of the robot dynamics are effectively estimated via a re-weighted1-minimization algorithm. Online recursive methods are integrated into SBL to achieve real-time system identification. By including sparsity and promoting online learning, the proposed method can handle time-varying dynamical systems and therefore improve operational stability and accuracy. Experimental results on both simulated and real selective compliance assembly robot arm(SCARA) robots have demonstrated the effectiveness of the proposed method for industrial robots.

关键词： industrial robots sparse Bayesian learning online identification

A Review on Recent development of Cooling Technologies for Photovoltaic Modules

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Journal of Thermal Science 2020年第6期29卷 1410-1430页

作者： ZHANG Chunxiao shen Chao WEI shen WANG yuan LV Guoquan SUN Cheng Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information TechnologySchool of ArchitectureHarbin Institute of TechnologyHarbin 150090China The Bartlett School of Construction and Project Management University College London(UCL)London WC1E 7HBUK

When converting solar energy to electricity,a big proportion of energy is not converted for electricity but for heating PV cells,resulting in increased cell temperature and reduced electrical *** cooling technologies have been developed and used for PV modules to lower cell temperature and boost electric energy ***,little crucial review work was proposed to comment cooling technologies for PV ***,this paper has provided a thorough review of the up-to-date development of existing cooling technologies for PV modules,and given appropriate comments,comparisons and *** to the ways or principles of cooling,existing cooling technologies have been classified as fluid medium cooling(air cooling,water cooling and nanofluids cooling),optimizing structural configuration cooling and phase change materials *** influential factors and sub-methods were collected from the review work,and their contributions and impact have been discussed to guide future *** most cooling technologies reviewed in this paper are matured,there are still problems need to be solved,such as the choice of cooling fluid and its usability for specific regions,the fouling accumulation and cleaning of enhanced heat exchangers with complex structures,the balance between cooling cost and net efficiency of PV modules,the cooling of circulating water in tropical areas and the freezing of circulating water in cold *** be advocated,due to efficient heat transfer and spectral filter characters,nanofluids can promote the effective matching of solar energy at both spectral and spatial scales to achieve orderly energy utilization.

关键词： solar energy PV modules cooling technologies nanoparticles phase change materials

Surface analysis of tablets with and without coating film for common cold based on laser-induced breakdown spectroscopy

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Optoelectronics Letters 2025年

作者： YAO Lixing LI Jingwen LIU Yu shen Li WANG Cong Tianjin Key Laboratory of Quantum Optics and Intelligent Photonics， School of Science， Tianjin University of Technology

Medications for common cold are used routinely in daily life， and most of these are compounded to be more effective for people suffering from common cold. The composition and quality of the coating， a common component of tablets， have been of great concern. In this paper， laser-induced breakdown spectroscopy (LIBS)， with advantages of rapid， real-time， and in-situ analysis， was used for surface analysis of tablets with and without coating film for common cold. Firstly， the spectra of compound paracetamol and amantadine hydrochloride tablets (CPAHT) and compound diclofenac sodium and chlorphenamine maleate tablets (CDSCMT)， without and with coating film， respectively， were analyzed. Secondly， two kinds of tablets were investigated in-situ at depth to analyze the changes of atomic and molecular spectral line intensities under different number of laser pulses and verified using LIBS imaging method. Finally， the Ca and Ti elements in CDSCMT were analyzed by calibration free LIBS (CF-LIBS) to further verify the elemental content differences at different depth in the tablets with coating film. These results indicate that the LIBS technology can be used in fast， in-situ， depth， and multi-element detection for cold medication tablets.

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Increased Preoperative Glucose Variability Is Associated with Adverse Perioperative Outcomes Following Orthopedic Surgery in Patients with Type 2 Diabetes Mellitus

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Current Medical Science 2020年第3期40卷 523-529页

作者： Si-jie yuan Jie shen department of Endocrinology and Metabolic Diseases The Third Affiliated HospitalSouthern Medical UniversityGuangzhou510630China

The association between glucose variability(GV)and adverse perioperative outcomes in type 2 diabetes mellitus(T2DM)patients undergoing orthopedic surgery was investigated.A retrospective cohort study was performed by analyzing data on T2DM patients receiving continuous blood glucose(BG)monitoring and continuous subcutaneous insulin infusion treatment due to poorly controlled preoperative BG prior to orthopedic *** was assessed with coefficient of variation(CV).Postoperative and perioperative CV,hypoglycemia cases,and other perioperative outcomes(diabetes preparation time[DPT],length of stay[LOS],and perioperative and infective complication cases)were *** showed that a total of 168 patients were grouped into preoperative CV tertiles:1st(n=56):0–0.2921,2nd(n=58):0.2922–0.3779,and 3rd(n=54):0.3780–*** blood glucose(FBG),perioperative CV,rate of hypoglycemia cases(OR:5.53,95%CI:2.43–12.59)(all P<0.001)and DPT(P=0.024)were higher in the 3rd than in the 1st *** adjustments of covariates,regression analysis indicated that the 3rd tertile was associated with increased perioperative CV(adjusted coefficient=0.515,P<0.001),DPT(adjusted coefficient=0.169,P=0.073),rate of hypoglycemia cases(OR:6.72,95%CI:2.69−16.82,P<0.001)and perioperative complication cases(OR:2.50,95%CI:0.90−7.01,P=0.080).In conclusion,preoperative GV is associated with increased perioperative GV and adverse perioperative outcomes including longer DPT and higher rates of hypoglycemia and perioperative complications.

关键词： glycemic variability orthopedics perioperative period type 2 diabetes mellitus

Mixed Hierarchical Networks for deep Entity Matching

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Journal of Computer Science & Technology 2021年第4期36卷 822-838页

作者： Chen-Chen Sun de-Rong shen Engineering Research Center of Learning-Based Intelligent System(Ministry of Education)Tianjin University of Technology Tianjin 300384China School of Computer Science and Engineering Tianjin University of TechnologyTianjin 300384China School of Computer Science and Engineering Northeastern UniversityShenyang 110819China

Entity matching is a fundamental problem of data *** groups records according to underlying real-world *** is a growing trend of entity matching via deep learning *** design mixed hierarchical deep neural networks(MHN)for entity matching,exploiting semantics from different abstract levels in the record internal hierarchy.A family of attention mechanisms is utilized in different periods of entity ***-attention focuses on internal dependency,inter-attention targets at alignments,and multi-perspective weight attention is devoted to importance ***,hybrid soft token alignment is proposed to address corrupted *** order is for the first time considered in deep entity ***,to reduce utilization of labeled training data,we propose an adversarial domain adaption approach(DA-MHN)to transfer matching knowledge between different entity matching tasks by maximizing classifier ***,we conduct comprehensive experimental evaluations on 10 datasets(seven for MHN and three for DA-MHN),which illustrate our two proposed approaches1 *** apparently outperforms previous studies in accuracy,and also each component of MHN is ***-MHN greatly surpasses existing studies in transferability.

关键词： entity matching attention mechanism mixed hierarchical neural network(MHN) domain adaption data integration