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Acta Geologica Sinica(English Edition) 2020年第4期94卷 972-987页

作者： HE Juan wang Baodi wang qiyu Chengdu Center China Geological SurveyChengdu 610081China College of Earth Sciences and Engineering Shandong University of Science and TechnologyQingdaoShandong 266590China

The Jiangda–Deqen–Weixi continental margin arc(DWCA) developed along the base of the Changdu–Simao Block and was formed as a result of the subduction of the Jinsha River Ocean Slab and the subsequent collision. The Ludian batholith is located in the southern part of the DWCA and is the largest batholith in northwest Yunnan. Granite samples from the Ludian batholith yield an early Middle Permian age of 271.0 ± 2.8 Ma. The geochemical data of the early Middle Permian granitoids show high Si2 O, low P2 O5 and MgO contents that belong to calc-alkaline series and peraluminous I-type rocks. Their εHf(t) values range from-5.01 to +0.58, indicating that they were formed by hybrid magmas related to the subduction of the Jinsha River Tethys Ocean. The monzonite and monzogranite samples yield Late Permian ages of 250.6 ± 1.8 Ma and 252.1 ± 1.3 Ma, respectively. The Late Permian granitoids are high-K calc alkaline and shoshonite series metaluminous I-type rocks. Their εHf(t) values range from-4.12 to-1.68 and from-7.88 to-6.64, respectively. The mixing of crustal and mantle melts formed the parental magma of the Late Permian granitoids. This study, combined with previous work, demonstrates the process from subduction to collision of the Jinsha River Paleo-Tethys Ocean.

关键词： I-type granite Ludian batholith Jinsha River Paleo-Tethys Jiangda–Deqen–Weixi continental margin arc

Role ofδ-ferrite in fatigue crack growth of AISI 316 austenitic stainless steel

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Journal of Materials Science & Technology 2022年第19期114卷 7-15页

作者： qiyu wang Shenghu Chen Xinliang Lv Haichang Jiang Lijian Rong CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

FF sample(nearly free ofδ-ferrite)and CF sample(containing∼4%δ-ferrite)were prepared from the AISI 316 austenitic stainless steel plate to elucidate the role ofδ-ferrite in the fatigue crack growth under the solution treated and accelerated aged *** is found that the fatigue crack growth resistance of the CF sample is higher than the FF sample under the solution treated ***,a significant deterioration of the fatigue crack growth resistance is observed in the CF sample while little variation is found in the FF sample after accelerated aging treatment at 750°C for 10 *** the solution treated condition,deflected crack growth path is present when the main crack encounters theδ-ferrite in the CF sample due to the differences in the fatigue responses between austenite andδ-*** measured growth rate of the deflected crack is significantly slower than that of the flat crack of the same *** the accelerated aging treatment,microcracks are produced at the M_(23)C_(6)/δinterface due to the strain incompatibility between M_(23)C_(6) and retainedδ-ferrite when the decomposedδ-ferrite is subject to plastic deformation in the crack tip plastic *** preexisting microcracks in the front of crack tip provide a viable path for crack propagation,resulting in the relatively flat crack path.

关键词： Austenitic stainless steel δ-ferrite Accelerated aging Fatigue crack growth Crack deflection

Soil NOx Emission Prediction via Recurrent Neural Networks

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Computers, Materials & Continua 2023年第10期77卷 285-297页

作者： Zhaoan wang Shaoping Xiao Cheryl Reuben qiyu wang Jun wang Department of Mechanical Engineering Iowa Technology InstituteUniversity of IowaIowa CityIA 52242USA Department of Chemical and Biochemical Engineering Iowa Technology InstituteUniversity of IowaIowa CityIA 52242USA

This paper presents designing sequence-to-sequence recurrent neural network(RNN)architectures for a novel study to predict soil NOx emissions,driven by the imperative of understanding and mitigating environmental *** study utilizes data collected by the Environmental Protection Agency(EPA)to develop two distinct RNN predictive models:one built upon the long-short term memory(LSTM)and the other utilizing the gated recurrent unit(GRU).These models are fed with a combination of historical and anticipated air temperature,air moisture,and NOx emissions as inputs to forecast future NOx *** LSTM and GRU models can capture the intricate pulse patterns inherent in soil NOx ***,the GRU model emerges as the superior performer,surpassing the LSTM model in predictive accuracy while demonstrating efficiency by necessitating less training ***,the investigation into varying input features reveals that relying solely on past NOx emissions as input yields satisfactory performance,highlighting the dominant influence of this *** study also delves into the impact of altering input series lengths and training data sizes,yielding insights into optimal configurations for enhanced model ***,the findings promise to advance our grasp of soil NOx emission dynamics,with implications for environmental management *** ahead,the anticipated availability of additional measurements is poised to bolster machine-learning model ***,the future study will explore physical-based RNNs,a promising avenue for deeper insights into soil NOx emission prediction.

关键词： Soil NOx emission long-short term memory gated recurrent unit sequence-to-sequence

Molecular Reactivity and Interface Stability Modification in In-Situ Gel Electrolyte for High Performance Quasi-Solid-State Lithium Metal Batteries

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Energy & Environmental Materials 2023年第3期6卷 8-19页

作者： qiyu wang Xiangqun Xu Bo Hong Maohui Bai Jie Li Zhian Zhang Yanqing Lai School of Metallurgy and Environment Central South UniversityChangsha 410083China Engineering Research Centre of Advanced Battery Materials The Ministry of EducationChangsha 410083China

Quasi-solid-state lithium metal battery is a promising candidate for next generation high energy density and high safety power *** intensive efforts on electrolytes,uncontrolled interfacial reactions on lithium with electrolyte and patchy interfacial contacts still hinder its practical ***,we bring in rationally designed F contained groups into polymer skeleton via in-situ gelation for the first time to establish quasi-solid-state *** method achieves a capacity retention of 90%after 1000 cycles at 0.5C with LiFePO_(4)*** interface constructed by polymer skeleton and reaction with–CF_(3)lead to the predicted solid electrolyte interface species with high ***,we optimize molecular reactivity and interface stability with regulating F contained end groups in the *** on different structures reveal that high performance solid stable lithium metal batteries rely on chemical modification as well as stable polymer skeleton,which is more critical to construct robust and steady SEI with uniform lithium *** approach with functional groups regulation proposes a more stable cycling process with a capacity retention of 94.2%at 0.5C and 87.6%at 1C after 1000 cycles with LiFePO_(4) cathodes,providing new insights for the practical development of quasi-solid-state lithium metal battery.

关键词： F contained end groups in-situ gel electrolyte interface stability molecular reactivity quasi-solid-state lithium metal battery

Physical properties of wax deposits on the walls of crude pipelines

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Petroleum Science 2009年第1期6卷 64-68页

作者： Huang qiyu wang Jifeng Zhang Jinjun Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum Beijing 102249 China

Wax deposits on the wall of a crude oil pipeline are a solid wax network of fine crystals, filled with oil, resin, asphaltene and other impurities. In this paper, a series of experiments on wax deposition in a laboratory flow loop were performed under different conditions （flow rate, temperature differential between crude oil and pipeline wall, and dissolved wax concentration gradient）, and the wax deposits were analyzed, so quantitative relationships among wax content, wax appearance temperature （WAT）, shear stress, and radial concentration gradient of dissolved wax at the solid/liquid interface were obtained. Finally, a model was established to predict WAT and the wax content of the deposit.

关键词： Crude oil wax deposits pipeline wax content wax appearance temperature (WAT)

Coexistence of Charge Order and Antiferromagnetic Order in an Extended Periodic Anderson Model

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Chinese Physics Letters 2021年第8期38卷 84-89页

作者： Yanting Li Bixia Gao qiyu wang Juan Zhang Qiaoni Chen Department of Physics Beijing Normal UniversityBeijing 100875China

The competition between the RKKY interaction and the Kondo effect leads to a magnetic phase transition,which occurs ubiquitously in heavy fermion ***,there are more and more experimental evidences indicating that the valence fluctuation plays an essential role in the Ce-and Y-based *** study an extended periodic Anderson model(EPAM)which includes the onsite Coulomb repulsion Ucf between the localized electrons and conduction *** employing the density matrix embedding theory,we investigate the EPAM in the symmetric case at half *** fixing the onsite Coulomb repulsion U of the localized electrons to an intermediate value,the interplay between the RKKY interaction,the Kondo effect and the Coulomb repulsion Ucf brings rich *** find three different phases,the antiferromagnetic phase,the charge order phase and paramagnetic *** the hybridization strength V between the localized orbital and the conduction orbital is small,the Kondo effect is weak so that the AF phase and the CO phase are *** phase transition between the two long-range ordered phase is of first *** also find a coexistence region between the two *** V increases,the Kondo effect becomes stronger,and the paramagnetic phase appears between the other two phases.

关键词： materials Kondo conduction

Structural regulation chemistry of lithium-ion solvation in nonflammable phosphate-based electrolytes for high interfacial compatibility with graphite anode

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Journal of Energy Chemistry 2023年第12期87卷 501-508,I0013页

作者： Chenyang Shi Xinjing Huang Jiahao Gu Zeyu Huang Fangyan Liu Mengran wang qiyu wang Bo Hong Zhian Zhang Jie Li Yanqing Lai School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina Engineering Research Centre of Advanced Battery Materials The Ministry of EducationChangsha 410083HunanChina Hunan Province Key Laboratory of Nonferrous Value-Added Metallurgy Central South UniversityChangsha 410083HunanChina Powder Metallurgy Research Institute State Key Laboratory of Powder MetallurgyCentral South UniversityChangsha 410083HunanChina

With the booming development of lithium-ion batteries,safety has become one of the most primary focuses of current *** there are various approaches to enhance the safety of lithiumion batteries,phosphate-based electrolyte holds the greatest potential for practical application due to their ***,its compatibility issue with the graphite anode remains a significant obstacle to its widespread ***,an effective method is proposed to improve the compatibility of electrolyte with graphite(Gr)anode by rationally adjusting the proportion of lithium salt and solvent components to optimize the Li^(+)solvation *** slightly increasing the Li^(+)/triethyl phosphate(TEP)ratio,TEP alone cannot fully occupy the inner solvation sheath and therefore less polar ethylene carbonate(EC)has to be recruited,and the solvation structure gradually changes from Li^(+)–[TEP]_(4)to Li^(+)–[TEP]_(3)[EC]with the coexistence of EC and ***,EC molecules in the Li^(+)–[TEP]_(3)[EC]could be preferentially reduced on graphite compared to the TEP molecules,resulting in the formation of a uniform and durable solid-electrolyte interphase(SEI)*** from the optimized phosphate-based electrolyte,the Gr|Li battery exhibits a capacity retention rate of 96.8%after stable cycling at 0.5 C for 470 cycles which shows a longer cycle life than the battery with carbonate electrolyte(cycling at 0.5 C for 450 cycles).Therefore,this work provides the guidance for designing a non-flammable phosphate-based electrolyte for high-safety and long cycling-life lithium-ion batteries.

关键词： Ethylene carbonate Triethyl phosphate Solvation structure Non-flammable electrolyte

High energy density in ultra-thick and flexible electrodes enabled by designed conductive agent/binder composite

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Journal of Energy Chemistry 2024年第3期90卷 133-143,I0005页

作者： Xiaoyu Shen Hailong Yu Liubin Ben Wenwu Zhao qiyu wang Guanjun Cen Ronghan Qiao Yida Wu Xuejie Huang Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808Guangdong China

Thick electrodes can increase incorporation of active electrode materials by diminishing the proportion of inactive constituents,improving the overall energy density of ***,thick electrodes fabricated using the conventional slurry casting approach frequently exhibit an exacerbated accumulation of carbon additives and binders on their surfaces,invariably leading to compromised electrochemical *** this study,we introduce a designed conductive agent/binder composite synthesized from carbon nanotube and *** agent/binder composite facilitates production of dry-process-prepared ultra-thick electrodes endowed with a three-dimensional and uniformly distributed percolative architecture,ensuring superior electronic conductivity and remarkable mechanical *** this approach,ultra-thick LiCoO_(2)(LCO) electrodes demonstrated superior cycling performance and rate capabilities,registering an impressive loading capacity of up to 101.4 mg/cm^(2),signifying a 242% increase in battery energy *** another analytical endeavor,time-of-flight secondary ion mass spectroscopy was used to clarify the distribution of cathode electrolyte interphase(CEI) in cycled LCO *** results provide unprecedented evidence explaining the intricate correlation between CEI generation and carbon distribution,highlighting the intrinsic advantages of the proposed dry-process approach in fine-tu ning the CEI,with excellent cycling performance in batteries equipped with ultra-thick electrodes.

关键词： Conductive agent/binder composite Dry process Ultra-thick electrodes High energy density CEI reconstruction ToF-SIMS

Calibration of the superconducting gravimeter based on a cold atom absolute gravimeter at NIM

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Chinese Physics B 2018年第12期27卷 250-255页

作者： qiyu wang Jinyang Feng Shaokai wang Wei Zhuang Yang Zhao Lishuang Mou Shuqing Wu National Institute of Metrology Beijing 100029China China Jiliang University Hangzhou 310018China

The scale factor of a superconducting gravimeter(SG) is usually calibrated by using simultaneous and co-located gravity measurements with the FG5-type absolute gravimeter(AG). In this paper, another new kind of absolute gravimetercold atom gravimeter(CAG) is first reported to calibrate the SG. Five-day side-by-side gravity measurements have been carried out by using our CAG(NIM-AGRb-1) to calibrate the SG(iGrav-012) located at Changping Campus of the National Institute of Metrology(NIM) of China. A weighted least-squares method is applied to determine the scale factor and the result is given as(-928.01 ± 0.73) nm·s^(-2)·V^(-1) with a precision of 0.79‰. We have demonstrated that a calibration precision of 1‰ level can be achieved after 3 days of parallel observations at spring tide. The obtained calibration results are then compared with the previous calibration by FG5 X-249, which shows that the calibration precision obtained by using NIM-AGRb-1 was slightly higher than FG5 X-249 with the same time interval. The factors affecting the calibration precision are analyzed in the calibrations by means of different AGs. Finally, several calibration experiments for SG iGrav-012 are discussed. The final scale factor is estimated as(-927.58 ± 0.36) nm·s^(-2)·V^(-1) with an accuracy of 0.39‰. Our main results demonstrate that the CAGs can be used for high-precision calibrations of SGs.

关键词： cold atom gravimeter calibration superconducting gravimeter scale factor

Compression of Battery X-Ray Tomography Data with Machine Learning

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Chinese Physics Letters 2024年第9期41卷 153-158页

作者： Zipei Yan qiyu wang Xiqian Yu Jizhou Li Michael K.-P.Ng Department of Electronic Engineering The Chinese University of Hong KongHong KongChina Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Huairou Division Institute of PhysicsChinese Academy of SciencesBeijing 101400China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China CUHK Shenzhen Research Institute Shenzhen 518057China Department of Mathematics Hong Kong Baptist UniversityHong KongChina

With the increasing demand for high-resolution x-ray tomography in battery characterization,the challenges of storing,transmitting,and analyzing substantial imaging data necessitate more efficient *** data compression methods struggle to balance reduction ratio and image quality,often failing to preserve critical details for accurate *** study proposes a machine learning-assisted compression method tailored for battery x-ray imaging *** physics-informed representation learning,our approach significantly reduces file sizes without sacrificing meaningful *** validate the method on typical battery materials and different x-ray imaging techniques,demonstrating its effectiveness in preserving structural and chemical *** results show an up-to-95 compression ratio while maintaining high fidelity in the projection and reconstructed *** proposed framework provides a promising solution for managing large-scale battery x-ray imaging datasets,facilitating significant advancements in battery research and development.

关键词： battery Battery details