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SSrN 2024年

作者： Li, Zhiyi Sun, He Wei, Wei Liu, Fengxia Sun, Haili Xu, Xiaofei Liu, Zhijun R&D Institute of Fluid and Powder Engineering Dalian University of Technology Dalian116024 China

Lithium nickel phosphate (LNP) possesses a high theoretical voltage of 5.1 V, making it well-suited to meet the demand for high voltage and high capacity required by today's electric devices. However, challenges related to synthesizing the pure phase of LNP, achieving high actual discharge specific capacity, and ensuring adequate cycling performance have limited the application of this electrode material in the realm of power battery technology. Therefore, this study focused on conducting first-principle calculations, utilizing the hydrothermal-solid phase method for synthesis, and exploring the correlation between Fe ion doping modification and the properties of LNP. Properties such as ionic conductivity, binding energy, and Li intercalation potential were determined using the CASTEP module in Material Studio. Additionally, experimental and computational methods were employed to evaluate the electrochemical properties of LNP and Fe-doped LNP. The study successfully combined theoretical calculations with hydrothermal synthesis results to reveal that the incorporation of Fe in LNP lowers the valence state of Ni, thereby stabilizing the lattice and broadening the lithium ion diffusion channels. Consequently, this modification significantly improves the electrochemical performance, particularly in terms of cycling stability. Specifically, compared with the unmodified version, the discharge specific capacity at 0.1 C increased by 131%, and the capacity retention rate over 20 cycles reached 83.1%. © 2024, The Authors. All rights reserved.

关键词： Lithium compounds

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rESEArCH ON AIrSPEEd COrrECTION technologyOFEJECTION SEAT BASEd ON CFd 34th

RESEARCH ON AIRSPEED CORRECTION TECHNOLOGYOFEJECTION SEAT BA...

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34th Congress of the International Council of the Aeronautical Sciences, ICAS 2024

作者： Jin, Lou Feng, Guanghui Wu, Liang Aviation Key Laboratory of Science and Technology on Life-support Technology Xianyang441000 China Overall Technology R&D Department AVIC Aerospace Life-support Industries Ltd Xianyang441000 China

A certain ejection seat airspeed sensing system is located in the wake flow field of the seat, andtheperceived static pressure will produce a large error from the local standard static pressure, requiringaerodynamic corrections to the sensed static pressure to ensure the accuracy of the measured velocityandaltitude parameters. In this paper, a technique to correct the static pressure of ejection seats duringejectionfrom the cabin is proposed, which combines CFd simulation and successive iterative approximationalgorithm. CFd simulation method was used to simulate the dynamic flow field during the seat egressfromcabin, and the total and static pressure data measured by the pitot tube sensing systemat ejectionvelocitybelow 3 Ma were analyzed. The total and static pressure values at different ejection speeds werecalculatedwith the principle of "total pressure taking the maximum and static pressure taking the minimum", andtherelationship curves of the static pressure correction coefficient with ejection velocity were obtained. Asuccessive iterative approximation algorithm was used to correct the measured static pressure basedontherelationship between the static pressure correction coefficient and the ejection velocity (Mach number). Thecalculation results show that the maximum error of perceived total pressure and static pressuresimulationvalues with test values is 2.5% at different speeds, and the maximum error of felt static pressuresimulationis 1.9%. The CFd simulation accuracy is high, and the simulation results can be used as input foraerodynamic correction. When the ejection velocity is less than Mach 3, the static pressurecorrectioncoefficient decreases monotonically with the ejection velocity increasing, and the successiveiterativeapproximation calculation converges. The maximum error between the static pressure correctionvaluecalculated by the successive iterative approximation algorithm and the static pressure at the test siteis3.8%, and the maximum error betwe

关键词： Ejection seats

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A disk Failure Prediction Algorithm Based on Fusion Model 23

A Disk Failure Prediction Algorithm Based on Fusion Model

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15th International Conference on Machine Learning and Computing, ICMLC 2023

作者： Zhao, Liqiang Qi, Kaiyuan Su, Zhiyuan Pang, Liye Zhang, Lianfa Wu, dong Cloud Computing R&D Department of Jinan Inspur Data Technology State Key Laboratory of High-end Server & Storage Technology China

ISBN: (纸本)9781450398411

disk failure prediction is of great significance for ensuring the business continuity and data reliability of cloud data centers. Algorithm performance will directly affect operation and maintenance costs and user experience. Nowadays, many disk manufacturers use the threshold of S.M.A.r.T. data to check disk fault detection or make prediction, but the detection accuracy of this method is low. This paper proposes a disk fault prediction method based on deep learning, using deep residual network to extract high-dimensional hidden features;and using deep neural network combined with integrated tree model tool XGBoost to perform Failure prediction. Moreover, we use AutoML strategy based on improved GA to get the best model structure. Experiments based on Backblaze data show that this method has better prediction performance. Compared with pure XGboost methods, it can better reduce the false alarm rate about 50% and improve the accuracy rate, while maintaining a strong generalization ability. © 2023 ACM.

关键词： Fault detection

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Organic matter occurrence and pore-forming mechanisms in lacustrine shales in China

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Petroleum Science 2022年第4期19卷 1460-1472页

作者： Li-Chun Kuang Lian-Hua Hou Song-Tao Wu Jing-Wei Cui Hua Tian Li-Jun Zhang Zhong-Ying Zhao Xia Luo Xiao-Hua Jiang Science and Technology R&D Department CNPCBeijing100000China Research Institute of Petroleum Exploration and Development CNPCBeijing100083China National Energy Tight Oil and Gas R&D Center Beijing100083China Key Laboratory of Oil and Gas Reservoirs CNPCBeijing100083China

The evolution of pore structure in shales is affected by both the thermal evolution of organic matter(OM)and by inorganic diagenesis,resulting in a wide variety of pore *** paper examines the OM distribution in lacustrine shales and its influence on pore structure,and describes the process of porosity *** principal findings are:(i)Three distribution patterns of OM in lacustrine shales are distinguished;laminated continuous distribution,clumped distribution,and stellate scattered *** differences in total organic carbon(TOC)content,free hydrocarbon content(S_(1)),and OM porosity among these distribution patterns are discussed.(ii)Porosity is negatively correlated with TOC and plagioclase content and positively correlated with quartz,dolomite,and clay mineral content.(iii)Pore evolution in lacustrine shales is characterized by a sequence of decreasing-increasing-decreasing porosity,followed by continuously increasing porosity until a relatively stable condition is reached.(iv)A new model for evaluating porosity in lacustrine shales is *** this model,the organic and inorganic porosity of shales in the Permian Lucaogou Formation are calculated to be 2.5%-5%and 1%-6.3%,respectively,which correlate closely with measured *** findings may provide a scientific basis and technical support for the sweet spotting in lacustrine shales in China.

关键词： Shale oil Unconventional oil and gas Organic matter Pore evolution Log interpretation model

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Crack Initiation and Propagation Mechanism of rapidly Tempered High-Si Steel during Hydrogen Embrittlement

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Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan 2025年第2期111卷 21-31页

作者： Sunako, Manami Mizumoto, Masataka Tanaka, ren Kumai, Shintaro Yamauchi, Yuichiro Ooi, Azusa Tada, Eiji R&D Div. NHK Spring Co. Ltd. Japan Laboratory for Future Interdisciplinary Research of Science and Technology Institute of Integrated Research Institute of Science Tokyo Japan Dept. Materials Science and Engineering School of Materials and Chemical Technology Institute of Science Tokyo Japan

In this study, we focused on fine dispersion of Fe2-3C(Ε) by combining the addition of Si and rapid tempering to improve the hydrogen embrittlement resistance of high-strength spring steels. The aim of this study is to clarify the fracture mechanism of rapidly tempered high-Si steels: the JISSUP7 (2.0Si) and SAE9254 (1.4Si) spring steels were tempered at different tempering rates by induction (IH) and furnace heating (FH) methods. Bending test were carried out during the cathodic hydrogen charging to observe the fracture origin and morphology of the steels. The size and volume of carbides were quantified using small-angle X-ray scattering method (SAXS) and synchrotron radiation Xrd. The distribution of carbides was observed with the replica method: facets were observed at the fracture origin of the 2.0Si-IH steel and 1.4Si-IH steel, which contained retained γ in the microstructure. It was considered that the facets formed because retained γ at the grain boundaries transformed into martensite during hydrogen embrittlement, promoting intergranular cracking;the 2.0Si-IH steel contained the largest amount of retained γ, but also contained fine Fe2-3C(Ε) in the lath. This suggests that dislocations and hydrogen are less likely to accumulate at the grain boundaries, resulting in the longest fracture life. In other words, in rapidly tempered high Si steels (2.0Si-IH steels), the fine dispersion of Fe2-3C(Ε) has more influence on the suppression of crack initiation and propagation than the increase in the amount of retained γ, and this contributes significantly to the fracture life. © 2025 The Iron and Steel Institute of Japan.

关键词： Hydrogen embrittlement

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Experimental and theoretical investigation of a novel multi-amino-functionalized ionic phase change absorbent for efficient CO2 absorption loading with low energy consumption

SSRN

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SSrN 2024年

作者： Hu, Bo Wei, Wei Liu, Fengxia Xu, Xiaofei Li, Zhiyi Liu, Zhijun R&D Institute of Fluid and Powder Engineering Dalian University of Technology Dalian116024 China

A great potential for CO2 capture is that combining the advantages of both structural tunability of functionalized ionic liquids and low energy consumption of phase change absorbent. In this study, a novel multi-amino groups functionalized ionic liquids [TEPAH][Lys] was synthesized and dissolved in NPA and H2O to achieve high absorption loading while minimizing energy. The experimental results demonstrated that the [TEPAH][Lys]/NPA/H2O absorbent exhibited a remarkable CO2 absorption loading of 2.93 mol·mol absorbent-1 with 97.54% of the CO2 products were concentrated in the lower phase occupying only 38% of the total volume. Meanwhile, the lower phase displayed low viscosity and excellent fluidity. The good stability was demonstrated by the fact that the cyclic efficiency could maintain above 81.15% after fifth absorption-desorption cycles. 13C NMr analysis revealed that the [TEPAH][Lys]/NPA/H2O absorbent were able to react with CO2, the CO2 products of carbamate, protonated amine, and alkyl carbonates were presented only in the lower phase while the upper phase consisted of water and NPA. The quantum chemical calculations showed that CO2 products has a greater polarity and density, which cause it to be more soluble in water rather than in NPA. A low energy consumption of 2.60 GJ·ton-1 CO2 can be obtained by adding a small amount of the upper phase to the lower phase, which is approximately 33.50% lower than that of 30% MEA (3.91 GJ·ton-1 CO2) under similar conditions. Overall, [TEPAH][Lys]/NPA/H2O phase change absorbent exhibits a high CO2 absorption loading and low energy consumption, making it extremely potential for industrial carbon capture applications. © 2024, The Authors. All rights reserved.

关键词： Ionic liquids

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Non-invasive Healthcare Analytical Platform Based on Organic Electrochemical Transistors

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Chemical research in Chinese Universities 2024年第5期40卷 824-848页

作者： HU Xingyu MAO Ning YAN Xinwen HUANG Ling LIU Xu YANG Huige SUN Qingqing LIU Xuying JIA Hanyu School of Materials&Engineering Zhengzhou UniversityZhengzhou450001P.R.China Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education&Hubei Key Laboratory of Catalysis and Materials Science Hubei R&D Center of Hyperbranched Polymers Synthesis and ApplicationsSouth-Central University for NationalitiesWuhan430074P.R.China Science&Technology Innovation Center for Advanced Materials of Intelligent Equipment Longmen LaboratoryLuoyang471000P.R.China

Non-invasive bioelectronics,especially organic electrochemical transistors(OECTs),have drawn extensive attentions of academical and medical communities by virtue of their efficient bio-electronic interfacing,water-involved ionic transport,excellent ionic-electronic coupling,ultralow power consumption,wide detectable range,and outstanding detection *** structure diversity,low-temperature solution processability,facile bio/chemical functionalization,and excellent biocompatibility of organic mixed ionic-electronic conductors(OMIECs)render OECTs particularly suitable for non-invasive or minimally invasive healthcare analytical ***,we comprehensively review recent advances of the non-invasive analytical healthcare applications based on OECTs,especially on the detection of biomarkers or metabolites in the excretory biofluids,as well as the recording of electrophysiological signals.A brief introduction of OECT and its comparison with other organic thin-film transistors upon device configuration and working mechanism are firstly ***-of-the-art non-invasive OECT-based biosensors are summarized on their detection of ionic and molecular biomarkers,following with circuit design strategies of OECTs for real-time and in-situ electrophysiological recording from skin *** conclusion,remaining barriers and future challenges of non-invasive OECT-based bioelectronics towards lower detection limit,more accurate quantitative relationship between analyte concentrations and measured parameters,more intimate device-tissue interface,and long-term operation stability are deeply analyzed with a critical outlook.

关键词： Organic electrochemical transistor Non-invasive Bioelectronics Ion-selective Electrophysiological monitoring

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A rapid field crop data collection method for complexity cropping patterns using UAV and YOLOv3

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Frontiers of Earth Science 2024年第1期18卷 242-255页

作者： Huifang ZHANG Binyao WANG Zhonggang TANG Jiahui XUE ruihang CHEN Hongcheng KAN Shumiao LU Lina FENG Ye HE Shuhua YI Institute of Fragile Eco-environment Nantong UniversityNantong 226019China School of Geographic Science Nantong UniversityNantong 226019China Nantong Key Laboratory of Spatial Information Technology R&D and Application School of Geographic ScienceNantong UniversityNantong 226019China

Crop type mapping using remote sensing is critical for global agricultural monitoring and food ***,the complexity of crop planting patternsand spatial heterogeneity pose significant challenges to field data collection,thereby limiting the accuracy of remotely sensed crop *** study proposed a new approach for rapidly collecting field crop data by integrating unmanned aerial vehicle(UAV)images with the YOLOv3(You Only Look Once version 3)*** impacts of UAV flight altitude and the number of training samples on the accuracy of crop identification models were investigated using peanut,soybean,and maize as *** results showed that the average Fl-score for crop type detection accuracy reached 0.91 when utilizing UAV images captured at an altitude of 20 *** addition,a positive correlation was observed between identification accuracy and the number of training *** model developed in this study can rapidly and automatically identify crop types from UAV images,which significantly improves the survey efficiency and provides an innovative solution for acquiring field crop data in large areas.

关键词： deep learning flight altitude crop survey peanut soybean maize

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Future Grid Configuration of AC/dC distribution Network Considering the Influence of Photovoltaic Permeability

Future Grid Configuration of AC/DC Distribution Network Cons...

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2022 International Conference on Smart Energy and Electrical Engineering, SEEE 2022

作者： Ni, Jianfu Liang, Feng Zhang, Kun Yu, Zhuofei R&D Department in NARI Technology NARI Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China R&D Department in NARI Technology NARI Group Corporation State Key Laboratory of Smart Grid Protection and Controlline Nanjing China Tianjin China

With the implementation of China's "carbon neutral, carbon peak"dual carbon target action plan and the construction of a new power system, access to a high proportion of new energy and microgrid has changed the function and form of the distribution network. The current capacity of the distribution network to absorb a high proportion of new energy cannot fully meet the needs of future development. Through rational planning, the carrying capacity of a distribution network for new energy can be improved, operation efficiency can be improved, and expansion investment can be delayed. Therefore, based on the analysis of the current typical network architecture of the distribution network, combined with the development trend of the AC/dC distribution network and the development trend of a high proportion of new energy penetration, this paper puts forward the future architecture and network shape of the AC/dC distribution network, focusing on the short-term, long-term and cellular AC/dC distribution network shape characteristics. It also discusses the influence of Photovoltaic (PV) permeability level on the grid configuration selection of AC/dC distribution network. Finally, it discusses the problems worthy of attention in the future planning of AC/dC distribution networks. © Published under licence by IOP Publishing Ltd.

关键词： Electric power distribution

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MoS_(2) nanoflowers and PEdOT:PSS nanocomposite enabling wearable dual-mode pressure sensors

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Science China(Technological Sciences) 2024年第6期67卷 1737-1747页

作者： WANG FengMing YANG WeiJia MA Ke SHEN GengZhe SU daoJian LI BaiJun WANG ShuangPeng QIN BoLong ZHANG Chi XIN Yue CAO XiaoBing HE Xin School of Applied Physics and Materials Wuyi UniversityJiangmen529020China Biomaterials R&D Center Zhuhai Institute of Advanced TechnologyChinese Academy of SciencesZhuhai519003China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao999078China

A versatile sensing platform employing inorganic MoS_(2) nanoflowers and organic poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate)(PEdOT:PSS)has been investigated to develop the resistive and capacitive force-sensitive *** microstructure of the sensing layer heightens the sensitivity and response time of the dual-mode pressure sensors by augmenting electron pathways and inner stress in response to mechanical ***,the capacitive and resistive sensors exhibit sensitivities of 0.37 and 0.12 kPa^(-1),respectively,while demonstrating a remarkable response time of approximately 100 ***,it is noteworthy that the PEdOT:PSS layer exhibits excellent adhesion to polydimethylsiloxane(PdMS)substrates,which contributes to the development of highly robust force-sensitive sensors capable of enduring more than 10000loading/unloading *** combination of MoS_(2)/PEdOT:PSS layers in these dual-mode sensors has shown promising results in detecting human joint movements and subtle physiological ***,the sensors have achieved a remarkable precision rate of 98%in identifying target *** outcomes underscore the significant potential of these sensors for integration into applications such as electronic skin and human-machine interaction.

关键词： MoS_(2)/PEdOT:PSS nanocomposite force-sensitive sensor multi-scaled microstructure physiological signals monitoring object grasping recognition

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