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Round empty core infiltration and anti-filtration recharge wells and laboratory recharge tests

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Frontiers of Earth Science 2020年第2期14卷 298-305页

作者： Yuxi LI Wanglin LI Jiapeng HE chunhui zhang School of Water Conservancy and Environment University of JinanJinan 250022China

Anti-filtration recharge wells are commonly installed in river channels and irrigation canals on the Shandong Peninsula,China,and can be used as an important recharge facility for underground ***,during recharge,as the running time increases,the recharge capacity gradually *** study was undertaken to develop a new recharge well and mitigate this deficiency.A round empty core infiltration and antifiltration recharge well and laboratory recharge test equipment were ***,1:25 models of the recharge pond,a round empty core recharge wellhead,and an artificial recharge well were *** equal recharge levels and ambient groundwater levels,laboratory steady-flow recharge tests on the existing anti-filtration recharge well,the new round empty core infiltration and anti-filtration recharge well,and an artificial recharge well were carried *** data on the measured groundwater table and single-well recharge quantity were also collected and *** results showed that compared with the existing anti-filtration recharge well,the new round empty core infiltration and anti-filtration recharge well had stronger anti-deposition and anti-scouring properties,and the single-well recharge quantity increased by 403%.With an increase in the number of recharge tests,the single-well recharge quantity gradually decreased and tended to stabilize as a whole.

关键词： recharge well infiltration function anti-filtration function recharge quantity recharge test

Preparation,characterization and antioxidant activity analysis of three Maillard glycosylated bone collagen hydrolysates from chicken,porcine and bovine

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Food Science and Human Wellness 2024年第4期13卷 2002-2013页

作者： Liwei Qi Hongru zhang Yujie Guo Hong Liu chunhui zhang Key Laboratory of Agro-Products Processing Ministry of Agriculture and Rural AffairsInstitute of Food Science and TechnologyChinese Academy of Agricultural SciencesBeijing 100193China Laboratory of Biomass and Green Technologies University of Liege-Gembloux Agro-Bio TechPassage des déportés 2Gembloux B-5030Belgium

Bone collagen hydrolysates(peptides)derived from byproduct of animal product processing have been used to produce commercially valuable products due to their potential antioxidant *** glycosylated reaction is considered as a promising method to enhance the antioxidant activity of ***,this research aims at investigating the Maillard glycosylation activity and antioxidant activity of bone collagen hydrolysates from different *** this study,3 glycosylated bone collagen hydrolysates were prepared and characterized,and cytotoxicity and antioxidant activity were analyzed and *** free amino groups loss,browning intensity,and fluorescence intensity of G-Cbcp(glycosylated chicken bone collagen hydrolysates(peptides))were the heaviest,followed by G-Pbcp(glycosylated porcine bone collagen hydrolysates(peptides))and G-Bbcp(glycosylated bovine bone collagen hydrolysates(peptides)).The results of amino acid analysis showed that amino acid composition of different bone collagen hydrolysates was significantly different and the amino acid decreased to different degrees after Maillard glycosylated reaction,which may lead to differences in Maillard glycosylated reaction ***,the 3 glycosylated hydrolysates showed no significant *** results showed that glycosylation process significantly increased the antioxidant activity of bone collagen hydrolysates,and G-Cbcp showed the strongest antioxidant activity,followed by G-Pbcp and ***,compared with the bone collagen hydrolysates,3 glycosylated hydrolysates showed significant characteristic and structural changes,and higher antioxidant activity.

关键词： Bone collagen hydrolysates Glycosylation reaction Antioxidant activity

Numerical modeling of permeability evolution based on degradation approach during progressive failure of brittle rocks

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International Journal of Mining Science and Technology 2016年第4期26卷 535-542页

作者： zhang chunhui Yue Hongliang Zhao Quansheng Wang Laigui School of Civil Engineering Hebei University of Science and Technology Shijiazhuang 050018 China School of Mechanics and Engineering Liaoning Technical University Fuxin 123000 China

The permeability evolution of rock during the progressive failure process is described. In combination with the strength degradation index, the degradation formulas of s and a, which are dependent on the plastic confining strain component, the material constants of Hock-Brown failure criterion are presented, and a modified elemental scale elastic-brittle-plastic constitutive model of rock is established. The rela- tionship between volumetric strain and permeability through tri-axial compression is investigated. Based on the above, a permeability evolution model is established. The model incorporates confining pressure- dependent degradation of strength, dilatancy and corresponding permeability evolution. The model is implemented in FLAC by the FISH function method. The permeability evolution behavior of rock is inves-tigated during the progressive failure process in a numerical case. The results show that the model is cap- able of reproducing, and allowing visualization of a range of hydro-mechanical responses of rock. The effects of confining pressure on degradation of strength, dilatancy and permeability evolution are also reflected.

关键词： Hoek-Brown failure criterion Dilatancy Permeability evolution Confining pressure Degradation of strength

Distribution of methylsiloxanes in benthic mollusks from the Chinese Bohai Sea

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Journal of Environmental Sciences 2019年第2期31卷 199-207页

作者： Liqin Zhi Lin Xu Xudan He chunhui zhang Yaqi Cai State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental ScienceChinese Academy of Sciences University of Chinese Academy of Sciences Environmental Protection Research Institute of Light Industry School of Chemical & Environmental Engineering China University of Mining & Technology(Beijing) Institute of Environment and Health Jianghan University

Methylsiloxanes are a class of silicone compounds that have been widely used in various industrial processes and personal care products for several decades. This study investigated the spatial distribution of three cyclic methylsiloxanes(D4–D6) and twelve linear methylsiloxanes(L5–L16) in mollusks collected from seven cities along the Bohai Sea. D4–D6(df = 71%–81%) and L8–L16(df = 32%–40%) were frequently detectable in the mollusk samples, while L5–L7 were not found in any mollusk samples. Cyclic methylsiloxanes(D4–D6) were found in mollusks with the mean concentrations of 15.7 ± 12.3 ng/g ww for D4,24.6 ± 15.8 ng/g ww for D5 and 34.0 ± 23.0 ng/g ww for D6. Among the seven sampling cities, the cyclic methylsiloxanes were predominant in mollusks, with the total cyclic methylsiloxanes(sum of D4–D6, ∑ CMS) accounting for 74.2%–80.7% of the total methylsiloxanes. ∑ CMS along the coastline demonstrated a clear gradient, with the highest concentrations in mollusks at the sampling sites located in the western part of the Bohai Sea and the lowest concentrations in mollusks from cities located in the eastern part of the Bohai Sea. The biota-sediment accumulation factors for cyclic methylsiloxanes(D4–D6) and linear methylsiloxanes(L8–L16) were estimated as 0.42 ± 0.06–0.53 ± 0.06 and0.13 ± 0.03–0.19 ± 0.05, respectively.

关键词： Methylsiloxane Mollusks Sediment Bioaccumulation

Explainable machine learning model for predicting molten steel temperature in the LF refining process

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International Journal of Minerals,Metallurgy and Materials 2024年第12期31卷 2657-2669页

作者： Zicheng Xin Jiangshan zhang Kaixiang Peng Junguo zhang chunhui zhang Jun Wu Bo zhang Qing Liu State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Automation and Electrical Engineering University of Science and Technology BeijingBeijing 100083China Tangshan Branch Hebei Iron and Steel Co.Ltd.Tangshan 063000China Xinjiang Bayi Iron and Steel Co. Ltd.Baosteel GroupUrumqi 830022China Lvliang Jianlong Industrial Co. Ltd.Lvliang 032100China

Accurate prediction of molten steel temperature in the ladle furnace(LF)refining process has an important influence on the quality of molten steel and the control of steelmaking *** research on establishing models to predict molten steel temperature has been ***,most researchers focus solely on improving the accuracy of the model,neglecting its *** present study aims to develop a high-precision and explainable model with improved reliability and *** eXtreme gradient boosting(XGBoost)and light gradient boosting machine(LGBM)were utilized,along with bayesian optimization and grey wolf optimiz-ation(GWO),to establish the prediction *** performance evaluation metrics and graphical representations were applied to compare the optimal XGBoost and LGBM models obtained through varying hyperparameter optimization methods with the other *** findings indicated that the GWO-LGBM model outperformed other methods in predicting molten steel temperature,with a high pre-diction accuracy of 89.35%within the error range of±5°*** model’s learning/decision process was revealed,and the influence degree of different variables on the molten steel temperature was clarified using the tree structure visualization and SHapley Additive exPlana-tions(SHAP)***,the explainability of the optimal GWO-LGBM model was enhanced,providing reliable support for prediction results.

关键词： ladle furnace refining molten steel temperature eXtreme gradient boosting light gradient boosting machine grey wolf op-timization SHapley Additive exPlanation

Dynamic characteristics of nonlinear vibration isolator for gas turbine

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International Journal of Mechanical System Dynamics 2024年第3期4卷 374-383页

作者： Teng Wang Linhan Feng Lei zhang chunhui zhang Yue Wu Naval Research Institute BeijingChina

In this study,a theoretical model of the vibration isolation system of the gas turbine is developed and numerically solved.A simplified finite element(FE)model was also established to determine the response under the shock *** results of the FE model are used to verify the effectiveness of the theoretical model and the numerical *** influence of isolator stiffness,vibration isolator damping,and vibration isolator nonlinear stiffness coefficient on the shock response of the vibration isolation system is studied using the controlled-variable *** parameters(stiffness,damping,and nonlinear coefficient)enter into the shock resistance design of gas turbine vibration isolators.

关键词： gas turbine vibration isolator theoretical model damping dynamic characteristics

Bubble transfer on wettability-heterogeneous surfaces

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Chinese Chemical Letters 2023年第7期34卷 472-476页

作者： chunhui zhang Xiao Xiao Ziwei Guo Lei Jiang Cunming Yu CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore

Researches have investigated the formation, transportation and spreading of bubble on solid surface with specific wettability. However, bubble transfer on wettability-heterogeneous surfaces has been rarely reported, which also plays significant role in water electrolysis, heat transfer, micro-bubble collection, *** this work, we carefully investigate the behavior of bubble transfer from the aerophobic or aerophilic region to the superaerophilic region through fabricating the wettability-heterogenous surfaces. Surface energy was elucidated to be transformed to the kinetic energy during bubble transfer process. Theoretical analysis on the average velocity of bubble transfer was consistent with the experimental *** influence of wettability of solid substrate, bubble volume and superaerophilic stripe width on bubble transfer are carefully investigated. Moreover, wettability-heterogeneous surfaces were explored to be applied in micro-CO_(2) bubble collection and H_(2) bubble removement in water splitting.

关键词： Bubble transfer Superaerophilicity Wettability-heterogenous Surface energy Bubble collection Water splitting

Research on depositing Ni45 alloy on titanium alloy surface by electrospark deposition

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China Foundry 2008年第4期5卷 244-248页

作者： You Tao zhang chunhui Su Guiqiao Yan Ping Shenyang Research Institute of Foundry Shenyang 110022 Liaoning China

Taking Ni45 bar as electrode,a strengthened layer of thickness up to 50μm was built up on BT20 titanium alloy matrix by means of electrospark *** of phase analysis by using of X-ray diffraction confirmed that the deposition layer was composed mostly of three phases,NiTi,NiTi2 and *** surface microhardness of the deposition layer was up to 910 HV0.05,about 2.7 times as high as that of the *** hardness at the cross-section of the entire deposition layer showed a gradient *** effects of capacitance and deposition time on thickness of deposition layer were also studied,and results showed that with relatively low capacity and short deposition time the deposition layer without cracks can be obtained.

关键词： titanium alloy electrospark deposition Ni45

Non-Resonant Structure Design of Catenary Transformer in Ultrasonic Gear Honing

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Wuhan University Journal of Natural Sciences 2012年第1期17卷 67-72页

作者： LI Xiangpeng zhang chunhui WANG Shiying College of Mechanical Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

To solve the design problem of transformer composed of non-resonant structure in ultrasonic gear-honing, force coupling conditions for moderately thick annular plate （MTAP） and catenary horn are proposed, and the frequency equations of the transformer, which consist of an MTAP and a catenary horn, are derived based on Mindlin＇s theory. The design parameters of the transformer were obtained by solving the frequency equations with the help of MATLAB, and its mode and frequency were deduced by the modal analysis of finite element method （FEM）, which are consistent with the theoretical design demands. The transformer design can be extended from system with thin annular plate to that with MTAP as the theoretical method by the simulation analysis of various ratios of the thickness to radius.

关键词： ultrasonic gear honing moderately thick annular plate (MTAP) Mindlin's theory catenary transformer