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3D particle streak velocimetry by defocused imaging

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Particuology 2023年第1期72卷 1-9页

作者： Xiangrui Dong Xiaoxiao Wang Wu Zhou Fangting Wang xinran Tang Xiaoshu Cai School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer for Power Engineering Shanghai 200093China

Particle streak velocimetry (PSV) has become one of the important branches of flow filed measurements. It extracts velocity information from particle trajectories captured by single frame long exposure images. Since the defocus of moving particle is inevitable during a long exposure time and under a large magnification, a novel three-dimensional (3D) velocity measurement method named defocusing particle streak velocimetry (DPSV) is proposed in this paper. On the one hand, an extension from two-dimensional (2D) to 3D velocity measurement with a monocular system is carried out. The depth information of the particle, which reflects the position in the third dimension, is indicated by the defocusing degree (characteristic parameter σ) of the particle images. The variation of σ along the trajectory is recognized by surface fitting of the gray value distribution of particle images, assuming that σ varies linearly along the trajectory. On the other hand, based on the linear fitting for the straight trajectory, an arc fitting model is developed for curved trajectories which are commonly captured in turbulent flow. The relationship between σ and the particle depth position z is experimentally calibrated using a LED light and a diaphragm. Finally, the DPSV method is verified in a submerged jet flow field as well as in a microchannel flow field to obtain the 3D velocity field with single monocular system.

关键词： Defocusing particle streak velocimetry Curve trajectory Three-dimensional velocity Gray value distribution

Identifiability Analysis of Load Model Parameters by Estimating Confidential Intervals

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CSEE Journal of Power and Energy Systems 2023年第5期9卷 1666-1675页

作者： xinran Zhang Chao Lu Ying Wang Qiantu Ruan Hongbo Ye Weihong Wang the School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China. the State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua UniversityBeijing 100084China School of Technology Beijing Forestry UniversityBeijing 100083China the State Grid Shanghai Electric Power Company Shanghai 200122China

The identification of load model parameters from practical measurement data has become an essential method to build load models for power system simulation,analysis and *** practical situations,the accuracy of the load model parameters identification results is impacted by data quality and measurement accuracy,which leads to the problem of *** this paper,an identifiability analysis methodology of load model parameters,by estimating the confidential intervals(CIs)of the parameters,is *** load model structure and the combined optimization and regression method to identify the parameters are first ***,the definition and analysis method of identifiability are *** CIs of the parameters are estimated through the profile likelihood method,based on which a practical identifiability index(PII)is defined to quantitatively evaluate ***,the effectiveness of the proposed analysis approach is validated by the case study results in a practical provincial power *** results show that the impact of various disturbance magnitudes,measurement errors and data length can all be reflected by the proposed ***,the proposed PII can provide guidance in data length selection in practical load model identification situations.

关键词： Confidential interval Load modeling parameter estimation practical identifiability

Band alignment and polarization engineering inκ-Ga_(2)O_(3)/GaN ferroelectric heterojunction

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Science China(Physics,Mechanics & Astronomy) 2022年第7期65卷 147-152页

作者： Yanting Chen Hongkai Ning Yue Kuang Xing-Xing Yu He-He Gong Xuanhu Chen Fang-Fang Ren Shulin Gu Rong Zhang Youdou zheng xinran Wang Jiandong Ye School of Electronic Science and Engineering Nanjing UniversityNanjing 210023China

Ferroelectric-semiconductor heterostructures offer an alternative strategy to manipulate polarization towards advanced devices with engineered functionality and improved *** this work,we report on the heteroepitaxial construction,band structure alignment and polarization engineering of the single-phasedκ-Ga_(2)O_(3)/GaN ferroelectric/polar heterojunction.A type-II band alignment is determined at theκ-Ga_(2)O_(3)/GaN polar hetero-interface,with a valence band offset of(1.74±0.1)eV and a conduction band offset of(0.29■0.1)*** the band edge discontinuity,charge dipoles induced by spontaneous polarization lead to the observed band bending with built-in potentials of 0.9 and 0.33 eV,respectively,at theκ-Ga_(2)O_(3)surface andκ-Ga_(2)O_(3)/GaN *** polarization switching properties of ferroelectricκ-Ga_(2)O_(3)are identified with a remanent polarization of approximately 2.7μC/cm^(2)via the direct hysteresis remanent polarization/voltage(P-V)loop *** findings allow the rational design ofκ-Ga_(2)O_(3)ferroelectric/polar heterojunction for the application of power electronic devices,advanced memories and even ultra-low loss negative capacitance transistors.

关键词： wide-bandgap semiconductors ferroelectric polarization band alignment

Autophagy mediates osteoporotic bone regeneration induced by micro-/nano-structured modification on hydroxyapatite bioceramics

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Engineered Regeneration 2023年第3期4卷 245-256页

作者： Jinjie Cui xinran Zhang Liming Cheng Kaili Lin Department of Oral and Cranio-maxillofacial Surgery College of StomatologyNational Center for StomatologyNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of StomatologyShanghai Research Institute of StomatologyShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai Jiao Tong UniversityShanghai 200011China Shanghai Engineering Research Center of Tooth Restoration and Regeneration School and Hospital of StomatologyTongji UniversityShanghai 200072China Department of Spine Surgery Tongji HospitalTongji University School of MedicineShanghai 200065China Ministry of Education Key Laboratory of spine and spinal cord injury repair and regeneration(Tongji University)ShanghaiChina

Osteoporosis(OP)is an age-related disease of bone metabolism,characterized by bone mass loss and bone mi-croarchitecture deterioration,the poor osteogenesis microenvironment of OP caused hardly repairing of the bone *** a dynamic process to fuel cellular renovation,autophagy has been proved to play a vital role in regulating cell differentiation and maintaining bone *** bone repairing biomaterials are hardly repairing the bone defects under OP pathological ***,it is essential to develop-ment novel biomaterials to improve osteoporotic *** to biochemical cues,biophysical cues exhibited more advantages in biocompatible and side ***,inspired by the importance of enhanced au-tophagic response in osteoporotic environment,we intend to utilize the micro-/nano-structured hydroxyapatite(mnHA)bioceramics as the mimic structure of natural bone tissue to regulate autophagic activity in ovariectomy bone mesenchymal stem cells(OVX-BMSCs),finally promote to bone regeneration in OP *** results indicated that mnHA bioceramics promoted cell adhesion and osteogenesis of OVX-BMSCs,and enhanced au-tophagy level in *** the calvarial defects of OVX-rats,the mnHA scaffold acquired excellent bone repair *** to the current findings,regulating the level of autophagy could be a promising strategy for improve osteoporotic osteogenesis in the future.

关键词： Osteoporosis Osteogenesis Autophagy Hydroxyapatite Micro-/nano-structured modification

A 3D hierarchical electrocatalyst:Core–shell Cu@Cu(OH)_(2)nanorods/MOF octahedra supported on N-doped carbon for oxygen evolution reaction

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Nano Research 2023年第5期16卷 8012-8017页

作者： xinran Li Yipei Li Changli Wang Huaiguo Xue Huan Pang Qiang Xu School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Shenzhen Key Laboratory of Micro/Nano-Porous Functional Materials(SKLPM) SUSTech-Kyoto University Advanced Energy Materials Joint Innovation Laboratory(SKAEM-JIL)Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of GuangdongDepartment of ChemistryDepartment of Materials Science and Engineering and SUSTech Academy for Advanced Interdisciplinary StudiesSouthern University of Science and Technology(SUSTech)Shenzhen 518055China

Cu-based materials are seldom reported as oxygen evolution reaction(OER)electrocatalysts due to their inherent electron orbital configuration,which makes them difficult to adsorb oxygen-intermediates during *** engineering the hierarchical architectures and the electronic structures can improve the performance of Cu-based OER catalysts,such as constructing multilevel morphology,inducing the porous materials,improving the Cu valence,building heterostructures,doping heteroatoms,*** this work,copper-1,3,5-benzenetricarboxylate(HKUST-1)octahedra in-situ grow on the Cu nanorod(NR)-supported N-doped carbon microplates,meanwhile an active layer of Cu(OH)_(2)forms on the surface of the original conductive Cu *** octahedral HKUST-1,serving as a spacer between the microplates,greatly improves the porosity and increases the available active sites,facilitating the mass transport and electron transfer,thus resulting in greatly enhanced OER performance.

关键词： core–shell nanorod Cu@Cu(OH)_(2) metal–organic framework oxygen evolution reaction

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逆境对中药材品质影响的研究进展

黑龙江科学 2024年第24期15卷 94-97页

作者：王晓飞吴青松肖宇刘淑霞刘星雨郑歆然关向军徐海军黑龙江省科学院大庆分院黑龙江大庆163319

中药材品质主要包括外在表征和内在成分两方面。影响中药材品质的因素除自身品种外,外界环境对其的影响也不容忽视。自然界中特殊环境条件如低温、盐碱、重金属等不良因素会对中药材的生长发育及品质产生较大影响,而中药材对这些逆境条... 详细信息

中药材品质主要包括外在表征和内在成分两方面。影响中药材品质的因素除自身品种外,外界环境对其的影响也不容忽视。自然界中特殊环境条件如低温、盐碱、重金属等不良因素会对中药材的生长发育及品质产生较大影响,而中药材对这些逆境条件的适应机制是近些年来的研究热点,探索如何降低逆境对中药材的伤害及如何利用适当逆境条件来提高中药材品质对中药产业发展具有重要意义。综述了低温胁迫、高温胁迫、水分胁迫、盐碱胁迫、重金属胁迫及除草剂对中药材品质的影响,展望了中药材对逆境利用的研究方向,为提高中药材品质提供参考。

关键词：逆境胁迫中药材次生代谢物品质

Two-dimensional semiconductor transistors and integrated circuits for advanced technology nodes

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National Science Review 2024年第3期11卷 11-13页

作者： Weisheng Li Haoliang Shen Hao Qiu Yi Shi xinran Wang National Laboratory of Solid-State Microstructures School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures Nanjing University Suzhou Laboratory The Interdisciplinary Research Center for Future Intelligent Chips(Chip-X) Nanjing University School of Integrated Circuits Nanjing University

Two-dimensional(2D) semiconductors,particularly transition metal dichalcogenides, exhibit high mobility within atomic-scale thickness, immunity to short-channel effects, and back-end-of-the-line(BEOL) compatibility wi...

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Porous rod-like Ni_(2)P/Ni assemblies for enhanced urea electrooxidation

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Nano Research 2021年第5期14卷 1405-1412页

作者： Qing Li xinran Li Jiawei Gu Yanle Li Ziqi Tian Huan Pang School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou225009China Guangling College Yangzhou UniversityYangzhou225009China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China

The urea oxidation reaction has attracted increasing ***,porous rod-like Ni2P/Ni assemblies,which consist of numerous nanoparticle subunits with matching interfaces at the nanoscale have been synthesized via a simple phosphating *** functional theory calculations and density of states indicate that porous rod-like Ni2P/Ni assemblies can significantly enhance the activity of chemical bonds and the conductivity compared with NiO/Ni toward the urea oxidation *** optimal catalyst of Ni2P/Ni can deliver a low overpotential of 50 mV at 10 mA·cm−2 and Tafel slope of 87.6 mV·dec−1 in urea oxidation ***,the constructed electrolytic cell exhibits a current density of 10 mA·cm−2 at a cell voltage of 1.47 V and an outstanding durability in the two-electrode *** work has provided a new possibility to fabricate metal phosphides-metal assemblies with advanced performance.

关键词： rod-like Ni_(2)P/Ni electrocatalyst urea electrooxidation overall urea electrolysis

Gadd45b is required in part for the anti-obesity effect of constitutive androstane receptor(CAR)

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Acta Pharmaceutica Sinica B 2021年第2期11卷 434-441页

作者： xinran Cai Ye Feng Meishu Xu Chaohui Yu Wen Xie Center for Pharmacogenetics and Department of Pharmaceutical Sciences University of PittsburghPittsburghPA 15261USA Department of Endocrinology and Metabolic Disease the First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China Department of Gastroenterology the First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China Department of Pharmacology and Chemical Biology University of PittsburghPittsburghPA 15261USA

Crosstalk between xenobiotic metabolism and energy metabolism in the liver has provided a potential opportunity to target xenobiotic receptors to treat metabolic *** of constitutive andro stane receptor(CAR),a xenobiotic-sensing nuclear receptor,has been shown to inhibit obesity,suppress hepatic gluconeogenesis,and ameliorate hyperglycemia in rodent models of obesity and type 2 ***,the underlying molecular mechanism remains to be *** growth arrest and DNA damage-inducible gene 45 b(Gadd45 b),a well-known anti-apoptotic factor,has been shown to be an inducible coactivator of CAR in promoting rapid liver *** is unknown whether the effect of CAR on energy metabolism depends on GADD45 *** the present study and by using a high fat diet(HFD)-induced obesity model,we show that reduced body weight gain and improved insulin sensitivity by the CAR agonist 1,4-bis[2-(3,5-dichloropyridyloxy)]benzene(TCPOBOP)were markedly blunted in Gadd45 b knockout ***,the TCPOBOP-responsive inhibition of hepatic lipogenesis,gluconeogenesis,and adipose inflammation observed in wild type mice were largely abolished in Gadd45 b knockout *** conclude that Gadd45 b is required in part for the metabolic benefits of CAR activation.

关键词： Obesity Diabetes CAR Gadd45b Glucogenogenesis Lipogenesis Xenobiotics Nuclear receptor