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Interface characteristics and wear resistance of Ni-B_(4)C plated ZTA reinforced high chromium cast iron composite

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China Foundry 2023年第3期20卷 253-262页

作者： Ke-liang li Wei li Yan-liang Yi Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhou 510632China National Joint Engineering Research Center of High Performance Metal Wear Resistant Materials Technology Jinan UniversityGuangzhou 510632China

A chemical composite plating of Ni-B_(4)C was used to prepare the surface-modified zirconia toughened alumina(ZTA)ceramic *** ceramic preforms were prepared by the plated ZTA and sodium silicate solution binder,followed by casting infiltration to prepare the ZTA particles reinforced high chromium cast iron(HCCI)*** result reveals that a distinct interface layer forms at the ZTA/HCCI interface,which consists of phases of ZrB_(2),FeB,Fe_(2)B,and NaSiO_(4).The interfacial wettability between ZTA and HCCI is improved by the diffusion and reaction of Ni and B_(4)*** wear test reveals that the Ni-B_(4)C plated ZTA particles can effectively improve the wear resistance of the ZTA/HCCI composite,and the wear rate of the composite is decreased to 11.6%of HCCI.

关键词： ZTA composite high chromium cast iron interface layer three-body abrasive wear

In Situ Synchrotron Radiation Techniques: Watching Deformation-induced Structural Evolutions of Polymers

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Chinese Journal of Polymer Science 2018年第10期36卷 1093-1102页

作者： liang-Bin li National Synchrotron Radiation Lab Chinese Academy of Sciences Key Laboratory of Soft Matter Chemistry Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film University of Science and Technology of China

Synchrotron radiation （SR） provides highly brilliant light with tunable wavelength from hard X-ray to far infrared, on which scattering, spectroscopy and imaging techniques with high time and spatial resolutions have been developed for in situ study on biological system and materials like polymer. With examples on flow-induced crystallization of polymer, deformation of nanoparticle filler network in rubber composite and necking propagation in tensile stretch, current work attempts to demonstrate the advantages of in situ synchrotron radiation X-ray scattering, X-ray nano-CT and infrared imaging in the study of deformation-induced multi-scale structural evolutions of polymers. With time resolution up to sub-ms, synchrotron radiation is expected to play a great role in understanding non-equilibrium polymer physics under processing and service conditions, while high-throughput characterization platform based on synchrotron radiation opens the possibility to establish polymer Materials Genome database in processing parameter space within reasonable time, which can serve as the roadmap for industrial polymer processing and accelerate material innovation.

关键词： Synchrotron radiation techniques X-ray nano-CT Flow-induced crystallization Necking propagation Rubber nanocomposite

Vanishing of stable homology with respect to a semidualizing module

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Frontiers of Mathematics in China 2018年第1期13卷 107-127页

作者： li liang School of Mathematics and Physics Lanzhou Jiaotong University Lanzhou 730070 China

We investigate stable homology of modules over a commutative noetherian ring R with respect to a semidualzing module C, and give some vanishing results that improve/extend the known results. As a consequence, we show ... 详细信息

关键词： Stable homology semidualizing module proper resolution

Evaluation of CMIP6 HighResMIP models in simulating precipitation over Central Asia

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Advances in Climate Change Research 2022年第1期13卷 1-13页

作者： liang-liang li Jian li Ru-Cong YU College of Atmospheric Sciences Lanzhou UniversityLcmzhou 730000China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China Research Center for Disastrous Weather Over Hengduan Mountains&Low-Latitude Plateau China Meteorological AdministrationKunming 650034China

The High Resolutio n Model Intercomparison Project(HighResMIP)experiment within the Coupled Model In tercomparison Project Phase 6(CMIP6),for the first time,has provided an opportunity to evaluate the performance of climate models over complex *** on the HighResMIP's historical simulations of atmospheric general circulation models,the performances of global high-resolution models,with a horizontal resolution finer than 50 km,in representing precipitation over Central Asia were evaluated using rain gauge observation *** the models successfully reproduce the large precipitation regions that are located over the mountainous areas and Northern Central ***,nearly all the models overestimate precipitation frequency over Central Asia and large overestimations of precipitation amount and frequency are located over the mountainous *** the HighResMIP multi-model ensemble mean performs better than all individual models at simulating the spatial pattern of precipitation frequency,it is inferior to HadGEM3-GC31-HM and ECMWF-IFS-HR at simulating that of precipitation *** simulation performance exhibits remarkable regional *** the Qilian Mountains,the relationship between precipitation and elevation is totally captured by climate *** contrast,over the Tianshan Mountains,the models fail to simulate the decrease in precipitation frequency after elevation higher than the maximum precipitation *** models successfully reproduce the annual cycle shape of precipitation amount over the Southern Central Asia,Qilian Mountains and Tianshan Mountains,but fail to reproduce it over the Northern Central *** than half of the high-resolution GCMs have a reduced bias relative to the corresponding low-resolution *** performances of most high-resolution GCMs in simulating precipitation pattern are well over the Tianshan Mountains.

关键词： CMIP6 HighResMIP Model evaluation Precipitation Elevation Central Asia

Modelling envelope and temporal fine structure components of frequency-following responses in rat inferior colliculus

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Science China(Technological Sciences) 2017年第7期60卷 966-973页

作者： WANG Qian li liang School of Psychological and Cognitive Sciences and Beijing Key Laboratory of Behavior and Mental Health Peking UniversityBeijing 100871China Beijing Key Laboratory of Epilepsy Epilepsy Center Department ofFunetional NeurosurgerySanbo Brain HospitalCapital Medical UniversityBeijing 100093China Speech and Hearing Research Center Key Laboratory on Machine Perception(Ministry of Education)Peking UniversityBeijing 100871China Beijing Institute for Brain Disorders Beijing 100081China

In studies of auditory perception, a dichotomy between envelope and temporal fine structure(TFS) has been emphasized. It has been shown that frequency-following responses(FFRs) in the rat inferior colliculus can be divided into the envelope component(FFREnv)and the temporal fine structure component(FFRTFS). However, the existing FFR models cannot successfully separate FFREnv and FFRTFS. This study was to develop a new FFR model to effectively distinguish FFREnv from FFRTFS by both combining the advantages of the two existing FFR models and simultaneously adding cellular properties of inferior colliculus neurons. To evaluate the validity of the present model, correlations between simulated FFRs and experimental data from the rat inferior colliculus were calculated. Different model parameters were tested, FFRs were calculated, and the parameters with highest prediction were chosen to establish an ideal FFR model. The results indicate that the new FFR model can provide reliable predictions for experimentally obtained FFREnv and FFRTFS.

关键词： frequency-following response envelope temporal fine structure inferior colliculus

Low-Temperature and Surfactant-Free Synthesis of Mesoporous TiO_2 Sub-Micron Spheres for Efficient Dye-Sensitized Solar Cells

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Journal of Materials Science & Technology 2016年第1期32卷 17-23页

作者： Kaimo Deng liang li College of Physics Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow University

Dye-sensitized solar cells （DSSCs） are one of the most promising next-generation solar cells due to their advantages over other counterparts. The photoanode of DSSCs has a great effect on the photovoltaic per- formance. Traditional photoanode includes a bottom nanoparticle layer and an upper scattering layer for better light capture in longer wavelength. Mesoporous nanostructures with size comparable to the wavelength of visible light are considered to be excellent light scattering centers by providing extra places for dye loading. Developing a green synthetic method is of great importance. Herein we report a facile and surfactant-free synthesis of mesoporous futile TiO2 submicrometer-sized spheres at temperature as low as 70 ℃. DSSCs based on photoanodes with an upper scattering layer composed of as-obtained mesoporous spheres on nanoparticle dense layer demonstrate an 18.0% improvement of power conver- sion efficiency. This simple approach may offer an energy-efficient and environmentally friendly alternative for DSSCs fabrication.

关键词： Titanium dioxide Mesoporous Sub-micron light scattering Dye-sensitized solar cells Energy harvesting

A fault tolerant model for multi-sensor measurement

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Chinese Journal of Aeronautics 2015年第3期28卷 874-882页

作者： li liang Shi Wei Information and Ecommerce Institute University of Electronic Science & Technology of China China Gas Turbine Establishment

Abstract Multisensor systems are very powerful in the complex environments. The cointegration theory and the vector error correction model, the statistic methods which widely applied in economic analysis, are utilized to create a fitting model for homogeneous sensors measurements. An algorithm is applied to implement the model for error correction, in which the signal of any sensor can be esti mated from those of others. The model divides a signal series into two parts, the training part and the estimated part. By comparing the estimated part with the actual one, the proposed method can iden tify a sensor with possible faults and repair its signal. With a small amount of training data, the right parameters for the model in real time could be found by the algorithm. When applied in data analysis for aero engine testing, the model works well. Therefore, it is not only an effective method to detect any sensor failure or abnormality, but also a useful approach to correct possible errors.

关键词： Cointegration Fault tolerant Measurement Multi-sensor Turbine engine

Generating pairing-friendly elliptic curves with fixed embedding degrees

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Science China(Information Sciences) 2017年第11期60卷 278-280页

作者： liang li School of Mathematical Sciences Fudan University

Appendix A The Cocks-Pinch method The Cocks-Pinch method can construct pairing-friendly curves with arbitrary embedding degree k but usually hasρ～*** is worked via first fixing a subgroup of order r and a CM discrim... 详细信息

关键词： Ni Generating pairing-friendly elliptic curves with fixed embedding degrees ECDLP

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Bi-based Nanowire and Nanojunction Arrays:Fabrication and Physical Properties

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Journal of Materials Science & Technology 2007年第2期23卷 166-181页

作者： liang li Guanghai li Xiaosheng FANG Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and Nanotechnology Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China Nanoscale Materials Center National Institute for Materials Science （NIMS）Namiki 1-1 Tsukuba Ibaraki 305-0044Japan

This article reviews the recent developments in the fabrication and properties of one-dimensional （1D） Bi-based nanostructures, including Bi, Sb, BixSb1-x and Bi2Te3 nanowire arrays, and Bi-Bi and Bi-Sb nanojunction arrays. In this article, we present an efiective method to fabricate Bi nanowire arrays with difierent diameters in anodic alumina membrane （AAM） with a single pore size by the pulsed electrodeposition. The fabrication of the high-filling and ordered Bi1-xSbx and Bi2Te3 single crystalline nanowire arrays, the Bi nanowire metalsemiconductor homojunction and Bi-Sb nanowire metal-semiconductor heterojunction arrays by the pulsed electrodeposition are reported. The factors controlling the composition, diameter, growth rate and orientation of the nanowires are analyzed, and the growth mechanism of the nanowire and nanojunction arrays are discussed together with the study of the electrical and thermal properties of Bi-based nanowires and ***, this review is concluded with some perspectives on the research directions and focuses in the Bi-based nanomaterials fields.

关键词： Bi One-dimensional Nanowire array Thermoelectric Electrodeposition