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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

Ultrafast dynamics of cationic electronic states of vinyl bromide by strong-field ionization-photofragmentation

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Chinese Physics B 2022年第2期31卷 641-645页

作者： Long-xing Zhou Yang Liu shen He Da-Shuai Gao xing-Chen shen qi Chen Tao Yu Hang Lv Hai-Feng Xu Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy Jilin UniversityChangchun 130012China

Strong field ionization-photofragmentation(SFI-PF)with ultrafast pump–probe scheme is a powerful approach to study the dynamics of molecular cationic electronic *** we carry out a SFI-PF study on the cationic electronic states of vinyl bromide,C_(2)H_(3)*** yields of the parent C_(2)H_(3)Br_(+)and the formation of the fragment(Br^(+),C_(2)H^(+)2 and C_(2)H^(+)3)ions have been measured at different pump–probe delay *** provides experimental evidence of A^(2)A'–X^(2)A'' internal conversion of vinyl bromide cations which occurs in a time of about 220 fs,and the time of C_(2)H_(3)^(+) formation induced by the dissociation of the A^(2)A' state around 300 *** study would add our knowledge of the behavior of electronic excited states of complex molecular cations.

关键词： strong field ionization ultrafast dynamics vinyl bromide cation

加味麻黄附子细辛汤治疗太阳少阴合病腰椎间盘突出症队列研究分析

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颈腰痛杂志 2023年第5期44卷 739-743页

作者：黄小霞周杰张帅刘康沈琪幸尹萌辰莫文石瑛上海市浦东新区中医医院非药物中心上海200120 上海中医药大学附属龙华医院骨伤科上海200032 上海中医药大学附属曙光医院骨伤科上海201203

目的探索加味麻黄附子细辛汤治疗腰椎间盘突出症疗效优势人群和和使用禁忌,凸显六经辨证特色和优势。方法选取2019年3月~2020年3月就诊于上海市浦东新区中医医院骨伤门诊患者,采用队列研究分析将运用加味麻黄附子细辛汤结合中医综合治... 详细信息

目的探索加味麻黄附子细辛汤治疗腰椎间盘突出症疗效优势人群和和使用禁忌,凸显六经辨证特色和优势。方法选取2019年3月~2020年3月就诊于上海市浦东新区中医医院骨伤门诊患者,采用队列研究分析将运用加味麻黄附子细辛汤结合中医综合治疗的腰椎间盘突出症与单纯采用中医综合治疗的腰椎间盘突出症患者分为暴露组和对照组,比较两组患者临床疗效,并将暴露组根据性别、年龄、二十四节气、体质量指数(body mass index,BMI)等因素进一步分亚组比较,探索麻黄附子细辛汤疗效优势人群和使用禁忌。结果共收集204例患者,一般资料分析证实各项数据差异均有可比性。经统计分析,所有亚组均可改善腰椎间盘突出症症状;其中年龄>50岁、BMI<26.9 kg/m^(2)、病程<3年、轻中劳动强度、冬春季组为加味麻黄附子细辛汤的疗效优势人群;回归分析显示,患者年龄越大,加味麻黄附子细辛汤疗效越好;病程越长,加味麻黄附子细辛汤疗效越差;高血压具有双向影响机制。结论①加味麻黄附子细辛汤可改善太阳少阴合病腰椎间盘突出症患者的症状;②加味麻黄附子细辛汤具有特定的疗效优势人群,在临床中,应选择有相应特征的患者使用。

关键词：麻黄附子细辛汤腰椎间盘突出症前瞻性队列研究疗效优势人群分析回归模型分析

Effect of Grain Size on the Precipitation Behaviour in Super-Ferritic Stainless Steels During a Long-Term Ageing

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Acta Metallurgica Sinica(English Letters) 2021年第9期34卷 1285-1295页

作者： Hui-Hu Lu xing-Quan shen Wei Liang School of Mechanical Engineering North University of ChinaTaiyuan 030051China College of Materials Science and Engineering Taiyuan University of Technology3 Xueyuan RoadTaiyuan 030024China

A 27.6Cr-3.6Mo-2Ni alloy was solution treated and then aged for a long time to study the effect of grain size on precipitation behaviour by using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The experimental results demonstrated that the average grain size increased from 46.3 ± 6.2 to 101.8 ± 13.5 μm and the grain boundary length per unit area decreased from 3.3 × 10^(4) to 1.7 × 10^(4) m/m^(2) with an increasing annealing temperature from 1100 to 1200 ℃. After ageing at 800 ℃, the σ-phase,χ-phase and Laves phase were observed. As the ageing time increased, the σ-phase notably increased, while the χ-phase and Laves phase gradually decreased before finally vanishing after ageing for 400 h. The σ-phase precipitation kinetics curves consisted of two parts, and the grain size had a significant effect on the first stage of the precipitation curves due to the abundance of nucleation sites in the specimens with finer grains. The Laves phase was transformed from Nb(C,N) particles by Nb diffusion. As the ageing time increased, the ferrite phase decreased due to the transformation of the ferrite phase to the σ-phase, and then C was expelled into the untransformed ferrite grains. Moreover, new Nb(C,N) particles were formed by Nb diffusion from the Laves phase, resulting in the absence of the Laves phase.

关键词： Ferritic stainless steel Grain size Ageing treatment σ-phase precipitation kinetics Laves phase transformation

A Cognitive Memory-Augmented Network for Visual Anomaly Detection

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IEEE/CAA Journal of Automatica Sinica 2021年第7期8卷 1296-1307页

作者： Tian Wang xing Xu Fumin shen Yang Yang the Center for Future Multimedia and School of Computer Science and Engineering University of Electronic Science and Technology of China(UESTC)Chengdu 611731China the Center for Future Multimedia and School of Computer Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731 the Institute of Electronic and Information Engineering of UESTC in Guangdong Dongguan 523808China

With the rapid development of automated visual analysis,visual analysis systems have become a popular research topic in the field of computer vision and automated *** analysis systems can assist humans to detect anomalous events(e.g.,fighting,walking alone on the grass,etc).In general,the existing methods for visual anomaly detection are usually based on an autoencoder architecture,i.e.,reconstructing the current frame or predicting the future ***,the reconstruction error is adopted as the evaluation metric to identify whether an input is abnormal or *** flaws of the existing methods are that abnormal samples can also be reconstructed *** this paper,inspired by the human memory ability,we propose a novel deep neural network(DNN)based model termed cognitive memory-augmented network(CMAN)for the visual anomaly detection *** proposed CMAN model assumes that the visual analysis system imitates humans to remember normal samples and then distinguishes abnormal events from the collected ***,in the proposed CMAN model,we introduce a memory module that is able to simulate the memory capacity of humans and a density estimation network that can learn the data *** reconstruction errors and the novelty scores are used to distinguish abnormal events from *** addition,we develop a two-step scheme to train the proposed model so that the proposed memory module and the density estimation network can cooperate to improve *** experiments evaluated on various popular benchmarks show the superiority and effectiveness of the proposed CMAN model for visual anomaly detection comparing with the state-of-the-arts *** implementation code of our CMAN method can be accessed at https://***/CMANcode/CMAN_pytorch.

关键词： Cognitive computing density estimation memory visual analysis systems visual anomaly detection.

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 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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Inkjet-Printed Organic Solar Cells and Perovskite Solar Cells: Progress,Challenges, and Prospect

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Chinese Journal of Polymer Science 2023年第8期41卷 1169-1197,I0005页

作者： xing-Ze Chen Qun Luo Chang-qi Ma School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230027China i-Lab&Printable Electronics Research Center Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

In recent years,the power conversion efficiency of organic solar cells(OSCs)and perovskite(PVSCs)has increased to over 19%and25%,***,the long-term stability of OSCs and PVSCs was also significantly improved with a better understanding of the degradation mechanism and the improvement of materials,morphology,and interface *** both the efficiency and lifetime of solar cells are approaching the commercialization limit,fabrication methods for large-area OSCs and PVSCs that can be directly transferred from lab to fab become essential to promote the industrialization of OSCs and *** with the coating methods,inkjet printing is a mature industrial technology with the advantages of random digital patterning,excellent precision and fast printing speed,which is considered to have great potential in solar cell *** efforts have been devoted to developing inkjet-printed OSCs and PVSCs,and much progress has been achieved in the last few *** this review,we first introduced the working principle of inkjet printing,the rheology requirements of inks,and the behaviors of the *** then summarized the recent research progresses of the inkjet-printed OSCs and PVSCs to facilitate knowledge transfer between the two *** the end,we gave a perspective on inkjet-printed OSCs and PVSCs.

关键词： Organic solar cells Perovskite solar cells Inkjet printing Ink formulation Morphology control

Multiscale description of molecular packing and electronic processes in small-molecule organic solar cells

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Chinese Chemical Letters 2016年第8期27卷 1453-1463,1471页

作者： xing-xing shen Guang-Chao Han Yuan-Ping Yi Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

This paper summarizes our recent works on theoretical modelling of molecular packing and electronic processes in small-molecule organic solar ***,we used quantum-chemical calculations to illustrate exciton-dissociation and charge-recombination processes at the DTDCTB/C_（60） interface and particularly emphasized the major role of hot charge-transfer states in the exciton-dissociation ***,we systematically analyzed the influence of DTDCTB surfaces with different features on the vacuum vapor deposition growth and packing morphologies of C_（60） via atomistic molecular dynamics simulations,and found that the formation of crystalline fullerene is the result of an integrated impact of stability,landscape,and molecular orientation of the substrate ***,we investigated the impact of different film-processing conditions,such as solvent evaporation rates and thermal annealing,on molecular packing configurations in a neat small-molecule donor material,DPP（TBFu）_2,and discussed the correlation between charge mobility and molecular packing via atomistic simulations in combination with electronic-structure calculations and kinetic Monte Carlo simulations.

关键词： Molecular packing Molecular self-assembly Photo-induced charge transfer Hot charge transfer state Charge transport Organic photovoltaics

Oscillation of Numerical Solution in the Runge-Kutta Methods for Equation x'(t)=ax(t)+a_0x([t])

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Acta Mathematicae Applicatae Sinica 2014年第4期30卷 943-950页

作者： qi WANG shen-shan qiU School of Apllied Mathematics Guangdong University of Technology CSIB Software Technology Center The Administrative Commission of Guangzhou Tianhe Software Park

The paper de ls with oscillation of Runge-Kutta methods for equation x＇（t） = ax（t）＋ aox（[t]）. The conditions of oscillation for the numerical methods are presented by considering the characteristic equation of the corresponding discrete scheme. It is proved that any nodes have the same oscillatory property as the integer nodes. Furthermore, the conditions under which the oscillation of the analytic solution is inherited by the numerical solution are obtained. The relationships between stability and oscillation are considered. Finally, some numerical experiments are given.

关键词： piecewise continuous arguments Runge-Kutta methods stablity oscillation

A Reflection on the 2017 Nobel Prize for Physiology and Chinese Medicine

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Chinese Journal of Integrative Medicine 2020年第11期26卷 867-872页

作者： xing Meng QU Ke-shen HUANG Yu xing Yu-rui Department of Dermatology Yueyang Hospital of Integrated Traditional Chinese and Western MedicineShanghai University of Traditional Chinese MedicineShanghai(200437)China Department of Chinese Medicine Surgery Longhua HospitalShanghai University of Traditional Chinese MedicineShanghai(200032)China Shaanxi University of Chinese Medicine Xi'an(712046)China

Research on the molecular mechanisms controlling circadian rhythm in Western medicine is comparable to the study of a day-night rhythm in Chinese medicine(CM),as also focus on the same life *** comparing the two,this paper elaborates on the differences between them in their respective issues of consciousness,ways of thinking,research methods and research *** speaking,Nobel Prize research has a stronger sense of the problems and concerns about the essence of“what”,while CM focuses on“how a thing functions”.The former mainly adopts experimental and mathematical methods,while the latter primarily depends on observation and *** natural philosophy and natural science eventually lead to the results and the inevitable,quantitative and qualitative *** on the life rhythm in CM should be proposed,scientific problems should be fully grasped,and research should be carried out with the aid of multidisciplinary new knowledge and new achievements through cross-disciplinary *** the basis of clinical epidemiological research and experimental research,a systematic review should be made of the human physiology of CM and the pathological rhythm model to explore the regulatory mechanism of time rhythm and create a new theory of time medicine.

关键词： Nobel Prize Chinese medicine contrast between Chinese medicine and Western medicine