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Phenological records in Guanzhong Area in central China between 600 and 902 AD as proxy for winter half-year temperature reconstruction

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Science China Earth Sciences 2016年第9期59卷 1847-1853页

作者： LIU YaChen DAI JunHu wang HuanJiong YE yu LIU HaoLong School of Geography Beijing Normal University Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources ResearchChinese Academy of Sciences

Phenological data obtained from historical documents constitute highly important ecological evidence for the pre-instrumental period, and can be used in analyzing climatic change in history. In this study, 87 phenological records about seasonality of non-biological events （e.g., first frost date）, agriculture and ornamental plants （e.g., first flowering date） over 77 years were extracted from historical documents from the Sui and Tang dynasties in China to reconstruct the winter half-year （from October to next April） temperatures in the Guanzhong Area （located in central China） from 600 to 902 AD. Transfer functions between temperature and phenophases with significant correlations were established by using modem observation data. Temperatures from the study period were reconstructed by applying the transfer functions to historical phenological data. The reconstruction indicates that the winter half-year temperatures during 600-902 AD were 0.23~C higher than the reference period （1961-1990）. The temperature changed with two distinct stages. During the 600s-800s, temperatures were approxi- mately 0.38~C higher than at present but then temperatures decreased in the subsequent period （800-902 AD）. These results are similar to ones from previous studies on the mean temperature and the divisions between warm and cold periods during the study period, though differences were found in the degree of warmness/coldness. This reconstruction provides a valuable contribution to a better understanding of climatic variability during the Sui and Tang dynasties in China.

关键词： Phenological records Temperature reconstruction Sui and Tang dynasties in China Guanzhong Area in China

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A Multi-semantics Classification Method Based on Deep Learning for Incredible Messages on Social Media

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Chinese Journal of Electronics 2019年第4期28卷 754-763页

作者： WU Lianwei RAO yuan yu Hualei wang Yiming AMBREEN Nazir Lab of Social Intelligence and Complex Data Processing School of Software Engineering Xi'an Jiaotong University

How to classify incredible messages has attracted great attention from academic and industry nowadays. The recent work mainly focuses on one type of incredible messages(a.k.a rumors or fake news) and achieves some success to detect them. The existing problem is that incredible messages have different types on social media, and rumors or fake news cannot represent all incredible messages. Based on this, in the paper, we divide messages on social media into five types based on three dimensions of information evaluation metrics. And a novel method is proposed based on deep learning for classifying the five types of incredible messages on social *** specifically, we use attention mechanism to obtain deep text semantic features and strengthen emotional semantics features, meanwhile, construct universal metadata as auxiliary features, concatenating them for incredible messages classification. A series of experiments on two representative real-world datasets demonstrate that the proposed method outperforms the state-of-the-art methods.

关键词： Information credibility evaluation Rumor detection Social media Text classification

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Removal of antibiotics from aqueous solution by using porous adsorbent templated from eco-friendly Pickering aqueous foams

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Journal of Environmental Sciences 2021年第4期33卷 352-362页

作者： Hui yu Yongfeng Zhu Aiping Hui Fangfang Yang Aiqin wang Key Laboratory of Clay Mineral Applied Research of Gansu Province Center of Eco-material and Green ChemistryLanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The aqueous foam template without any solvent and only using the particles stabilizer has attracted much attention for preparation of the porous ***,a novel porous adsorbent was fabricated via thermal-initiated polymerization of Pickering aqueous foams,which was stabilized by the natural sepiolite(Sep)and pine pollen,and utilized for the removal of antibiotic from aqueous *** stabilizing mechanism of Pickering aqueous foam of that the Sep was modified with the leaching substance from pine pollen and arranged orderly around the bubble to form a dense"shell"structure was *** adsorbents possessed the hierarchical porous structure and excellent adsorption performance for antibiotic of chlorotetracycline hydrochloride(CTC)and tetracycline hydrochloride(TC).The equilibrium adsorption capacities of CTC and TC were achieved with 465.59 and 330.59 mg/g within 60 min at 25℃,*** adsorption process obeyed Langmuir model and pseudo-second-order adsorption kinetic *** work provided eco-friendly approach for fabricate porous adsorbents for wastewater treatment.

关键词： Porous adsorbent Adsorption Antibiotic Pickering aqueous foams Pollen Sepiolite

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Period investigation of Algol systems TZ Eri and TU Her

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Research in Astronomy and Astrophysics 2019年第8期19卷 11-18页

作者： zhi-Hua wang Li-Ying Zhu Lin-Jia Li Xiao-Man Tian yunnan Observatories Chinese Academy of SciencesKunming650216China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming650216China Center for Astronomical Mega-Science Chinese Academy of SciencesBeijing100101China University of Chinese Academy of Sciences Beijing100049China

TZ Eri and TU Her are both classic Algol-type systems(Algols). By observing and collecting times of minimum light, we constructed the O-C curves for the two systems. The long-time upward and downward parabolas shown in these diagrams are considered to be the result of the combination of mass transfer and angular momentum loss. The secular orbital period change rates are d P/dt = 4.74(±0.12) ×10-7 d yr-1 and d P/dt =-2.33(±0.01) × 10-6 d yr-1, respectively. There are also cyclic variations in their O-C curves which might be caused by the light-travel time effect(LTTE). A circumbinary star may exist in the TZ Eri system with a mass of at least 1.34 M⊙, while there are possibly two celestial bodies that almost follow a 2 : 1 resonance orbit around the TU Her binary pair. Their masses are at least 2.43 M⊙and 1.27 M⊙.

关键词： stars:binaries:close stars:binaries:eclipsing stars:individual (TZ Eri, TU Her)

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Construction of an Arrhenius constitutive model for Mg-Y-Nd-Zr-Gd rare earth magnesium alloy based on the Zener-Hollomon parameter and objective evaluation of its accuracy in the twinning-rich intervals

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Journal of Magnesium and Alloys 2024年第7期12卷 2890-2908页

作者： Luyi Han Xiangjian Zhu Dejin Wei Yanan yu Guangchun wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinanShandong 250061PR China

According to a high-temperature compression test of rare earth magnesium alloy(WE43),a strain-compensated constitutive model of the Arrhenius equation based on Zener-Hollomon parameters was established,and the rheological behaviors were *** model exhibited relatively serious prediction distortion in the low-temperature and high-strain rate parameter interval,and its accuracy was still unsatisfactory even after modification by a correction operator considering the coupling of temperature and strain *** microstructure characterization and statistical analysis showed that a large number of twinning occurred in the parameter intervals with prediction *** occurrence of twinning complicated the local internal stress distribution by drastically changing the crystal orientation and led to significant fluctuations in the macroscopic strain-stress and hardening curves relative to the rheological processes dominated by the dislocation and softening mechanisms,making the logarithm of the strain rate and stress deviate from the linear *** twinning phenomenon was greatly influenced by the temperature and strain ***,the influence mechanism on twinning behavior was analyzed from the perspective of the interaction of dislocation and twinning.

关键词： RE magnesium alloy Hot deformation Zener-Hollomon parameters Arrhenius constitutive model Dislocation Twinning

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Piezocatalytic performance of Fe_(2)O_(3)−Bi_(2)MoO_(6) catalyst for dye degradation

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Frontiers of Chemical Science and Engineering 2023年第6期17卷 716-725页

作者： Lili Cheng Xiaoyao yu Danyao Huang Hao wang Ying Wu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials School of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China

A Fe_(2)O_(3)−Bi_(2)MoO_(6) heterojunction was synthesized via a hydrothermal *** electron microscopy,transmission electron microscopy,energy-dispersive X-ray,powder X-ray diffraction,Fourier transform infrared spectroscopy and ultra-violet−visible near-infrared spectrometry were performed to measure the structures,morphologies and optical properties of the as-prepared *** various factors that affected the piezocatalytic property of composite catalyst were *** highest rhodamine B degradation rate of 96.6%was attained on the 3% Fe_(2)O_(3)−Bi_(2)MoO_(6) composite catalyst under 60 min of ultrasonic *** good piezocatalytic activity was ascribed to the formation of a hierarchical flower-shaped microsphere structure and the heterostructure between Fe_(2)O_(3) and Bi_(2)MoO_(6),which effectively separated the ultrasound-induced electron–hole pairs and suppressed their ***,a potential piezoelectric catalytic dye degradation mechanism of the Fe_(2)O_(3)−Bi_(2)MoO_(6) catalyst was proposed based on the band potential and quenching effect of radical *** results demonstrated the potential of using Fe_(2)O_(3)−Bi_(2)MoO_(6) nanocomposites in piezocatalytic applications.

关键词： piezocatalysis Fe_(2)O_(3)−Bi_(2)MoO_(6) dye decomposition ultrasonic vibration

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An Approach to Collaborative Design Based on Distributed Constraint-Net

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Wuhan University Journal of Natural Sciences 2002年第1期7卷 82-86页

作者： He De-lin wang Geng-yun Li zhi-gang State Key Laboratory of Die and Mould Huazhong University of Science and Technology Wuhan Hubei China

We focuse on design process in concurrent engineering and propose an, approach to collaborative design based on distributed constraint-net. The approach adopts agent technology to express kinds of distributed constraints. And through the cooperation among agents, the consistency of constraint is maintained and the constraint conflict is detected and eliminated. The constraints are satisfied concurrently and distributively. Based on the proposed approach, the collaborative design process in concurrent engineering can be well supported.

关键词： design process collaborative design distributed constraint-net agent concurrent engineering

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Surface-improvement mechanism of hybrid electrochemical discharge process using variable-amplitude pulses

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Chinese Journal of Aeronautics 2020年第10期33卷 2782-2793页

作者： Yan ZHANG Zhengyang XU yu wang Qin NI Xiang LING School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 211800China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics&AstronauticsNanjing 210016China AECC Sichuan Gas Turbine Research Establishment Chengdu 610500China

Superalloys are commonly used in aircraft manufacturing;however,the requirements for high surface quality and machining accuracy make them difficult to *** this study,a hybrid electrochemical discharge process using variable-amplitude pulses is proposed to achieve this *** this method,electrochemical machining(ECM)and electrical discharge machining(EDM)are unified into a single process using a sequence of variable-amplitude pulses such that the machining process realizes both good surface finish and high machining ***,the machining mechanism of the hybrid electrochemical discharge process using variable-amplitude pulses is *** mechanism is investigated by observations of machining waveforms and machined *** is found that,with a high-frequency transformation between high-and low-voltage waveforms within a voltage cycle,the machining mechanism is frequently transformed from EDM to pure *** critical discharge voltage is 40 *** pulse voltages greater than 40 V are applied,the machining accuracy is good;however,the surface has defects such as numerous discharge *** machining accuracy is maintained when high-voltage pulses are replaced by low-voltage pulses to enhance electrochemical *** results indicate that the proposed hybrid electrochemical discharge process using variable-amplitude pulses can yield high-quality surfaces with high machining accuracy.

关键词： Electrical discharge machining Electrochemical machining Hybrid machining Superalloy Variable-amplitude pulse

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Extractive Distillation of Methyl Acetate-Methanol Azeotrope Using [DMIM]DMP as Solvent

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China Petroleum Processing & Petrochemical Technology 2018年第4期20卷 109-116页

作者： Li Jing wang Keliang Lian Minglei Li zhi Du Tingzhao College Of Chemistry and Materials Engineering Liupanshui Normal University North China Company China Petroleum Engineering Co. Ltd.

In order to separate methyl acetate and methanol azeotrope, the ionic liquid(IL) 1,3-dimethylimidazolium dimethylphosphate([DMIM]DMP) was used as the solvent. The Aspen Plus software was used to design and optimize the extractive distillation process. Under the optimized conditions, the mass fractions of methyl acetate and methanol were both above 99.5%. Compared with the dimethyl sulfoxide(DMSO) process, the [DMIM]DMP process has the advantages of saving energy and lower equipment investment cost. The result shows that using [DMIM]DMP as the solvent to separate a methyl acetate and methanol azeotrope has better prospect in industrial application.

关键词： extractive distillation 1,3-dimethylimidazolium dimethylphosphate azeotrope methyl acetate methanol

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Highly conductive wear resistant Cu/Ti3SiC2(TiC/SiC) co-continuous composites via vacuum infiltration process

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Journal of Advanced Ceramics 2020年第1期9卷 83-93页

作者： Dexuan YANG yu ZHOU Xingheng YAN Honglei wang Xingui ZHOU Science and Technology on Advanced Ceramic Fibers and Composites Laboratory National University of Defense TechnologyChangsha 410073China Department of Mechanical Materials and Aerospace EngineeringIllinois Institute of TechnologyChicago 60616USA

The MAX phase Ti3SiC2 has broad application prospects in the field of rail transit,nuclear protective materials and electrode materials due to its excellent electrical conductivity,selflubricating properties and wear ***–Ti3SiC2 co-continuous composites have superior performance due to the continuous distribution of 3 D network *** this paper,the Cu/Ti3SiC2(Ti C/Si C)co-continuous composites are formed via vacuum infiltration process from Cu and Ti3SiC2 porous *** co-continuous composites have significantly improved the flexural strength and conductivity of Ti3SiC2 due to the addition of Cu,with the conductivity up to 5.73×10^5 S/m,twice as high as the Ti3SiC2 porous ceramics and five times higher than *** reaction between ingredients leads to an increase in the friction coefficient,while the hard reaction products(Ti Cx,Si C)lower the overall wear rate(1×10^–3 mm^3/(N·m)).Excellent electrical conductivity and wear resistance make co-continuous composites more advantageous in areas such as rail transit.

关键词： Ti3SiC2 metal–ceramic co-continuous composites vacuum infiltration high conductive

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