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Mass transfer of a hybrid porous T-groove mechanical face seal under Elasto-hydrodynamic model

Heat and Mass Transfer/Waerme- und Stoffuebertragung 2025年第6期61卷 1-13页

作者： Li, Xueping Meng, Xiangkai Liang, Yangyang Jiang, Jinbo Peng, Xudong Institute of Process Equipment and Control Engineering Zhejiang University of Technology Hangzhou China

To investigate the coupling effects of porous media and lubricating film on hybrid mechanical seal performance, a three-dimensional Elasto-hydrodynamic (EHD) model is proposed. This model integrates the fluid-solid interaction of porous matrix and T-groove on the seal ring. The elastic deformation of sealing surfaces (especially the porous region) and the seepage behavior of lubricant in porous matrix are computed based on the finite element method (FEM), while the flow characteristics of the sealing medium in the sealing gap and the porous matrix are analyzed. The results indicate that face deformation alters the fluid flow path of the outer diameter of the sealing gap, which is not conducive to the mass transfer of the sealing medium in the sealing chamber, the sealing gap and the porous matrix. The permeability and depth of the porous matrix significantly influence the mass transfer behavior between the porous matrix and lubricating film, resulting in larger film thickness and leakage rate. These findings provide key design insights for controlling leakage and enhancing sealing efficiency in porous mechanical seal. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Elastic deformation

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Observer-based stabilization for discrete nonlinear semi-Markov jump singularly perturbed models with mode-switching delay

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Science China(Information Sciences) 2025年第4期68卷 389-390页

作者： Wenhai QI Runkun LI Ju H.PARK Zheng-Guang WU Huaicheng YAN School of Engineering Qufu Normal University Department of Electrical Engineering Yeungnam University Institute of Cyber-Systems and Control Zhejiang University Key Laboratory of Smart Manufacturing in Energy Chemical Process of Ministry of Education East China University of Science and Technology

Semi-Markov jump systems(S-MJMs) not only characterize hybrid systems but also address the limitations of Markov jump systems(MJMs) [1–3]. Due to their ability to exhibit multi-time-scale features, singularly perturbed models(SPMs) effectively model practical systems influenced by multiple time-scale phenomena [4]. In this study, the observer-based output feedback controller is asynchronous with the original system due to the time delay in the controller mode switching. A nonlinear plant with singularly perturbed parameters(SPPs) is represented using an interval type-2(IT2) fuzzy model [5].

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High concentration of Ti^(3+)in C-TiO_(x)nanosheets boosting efficient photodegradation

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Science China(Technological Sciences) 2025年第3期68卷 156-166页

作者： Chongbei WU Xuan LI Haibin WANG Jiaxin TANG Shuai WEI Yuanyuan WU Aobing WANG Jizhou JIANG Hebei Key Laboratory of Man-machine Environmental Thermal Control Technology and Equipment Hebei Vocational University of Technology and EngineeringXingtai054000China School of Materials Science and Engineering Key Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationWuhan Institute of TechnologyWuhan430205China

Semiconductor photocatalysis holds significant promise for addressing dye-pollution in ***,the efficiency of photocatalytic water purification is constrained by the weak light absorption capacity and low active site distribution of *** a bottom-up approach,carbon-doped TiO_(x)(C-TiO_(x))nanosheets with high concentrations of Ti^(3+)active sites were fabricated by etching the Al element in Ti_(3)Ai C_(2)with H_(2)O_(2).Experimental evidence demonstrates that the optimal C-TiO_(x)nanosheets exhibit high activity for the photocatalytic degradation of methylene blue,achieving a degradation rate of 100%within 50 *** introduction of carbon into the C-TiO_(x)nanosheets induces a red shift in the absorption edge,boosting the migration of photo-generated charge ***,there is a significant correlation between the concentration of Ti^(3+)active sites and the density of oxygen vacancies in the C-TiO_(x)nanosheets,which synergistically influence the photocatalytic degradation performance of MB dye wastewater.

关键词： bottom-up strategies C-TiO_(x)nanosheets high-concentrations Ti^(3+) photocatalytic degradation

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Insight into leaching rare earth from ion-adsorption type rare earth ores with citric acid:Performance,kinetic analysis and differentiation leaching

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Journal of Rare Earths 2025年第3期43卷 591-602,I0007页

作者： Mengfei Zhao Zedong Teng Xingyu Ma Xiaoliang Jiang Hualin Zhang Youming Yang Tinggang Li Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China Key Laboratory of Rare Earths Jiangxi Institute of Rare EarthsGanjiang Innovation AcademyChinese Academy of SciencesGanzhou341119China CAS Key Laboratory of Green Process and Engineering Innovation Academy for Green ManufactureNational Engineering Research Center of Green Recycling for Strategic Metal ResourcesBeijing Engineering Research Centre of Process Pollution ControlInstitute of Process EngineeringChinese Academy ofSciencesBeijing100190China State Key Laboratory of Biochemical Engineering Key Laboratory of Biopharmaceutical Preparation and DeliveryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

The rare earth elements(REEs)extraction by chemical leaching from ion-adsorption type rare earth ores(IAREO)has led to serious ecological and environmental ***,demand for bioleaching is on the rise with the advantage of being *** one of the organic acids produced by biological metabolism,citric acid was used to leach REEs and explore the performance and *** results demonstrate that citric acid exhibits higher leaching efficiency(96.00%)for REEs at a relatively low concentration of 0.01 mol/L compared with(NH_(4))_(2)SO_(4)(84.29%,0.1 mol/L)and MgSO_(4)(83.99%,0.1 mol/L).Citric acid shows a preference for leaching heavy rare earth elements,with 99%leaching efficiency in IAREO,which shows higher capacity than(NH_(4))_(2)SO_(4)and MgSO_(4)(as inorganic leaching agents).Kinetic analysis indicates that the leaching process of REEs with citric acid is controlled by both the internal diffusion kinetics and chemical reaction kinetics,which is different from inorganic leaching *** Minteq calculations confirm that RE-Citrate is the main constituent of the extract solution in the leaching process of the IAREO,thereby enhancing the leaching efficiency of REEs from the *** suggests that citric acid may be used as a promising organic leaching agent for the environmentalfriendly extraction of REEs from IAREO.

关键词： Ion-adsorption type rare earth ores Rare earths Citric acid Complexation Organic acid Differential leaching

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Properties Evaluation of Copper-Titanium Composites by a Spark Plasma Sintering process

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Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 2025年 72卷 S931-S937页

作者： Yang, Min-Hyeok Park, Bum-Soon Oh, Ik-Hyun Moon, Hyoung-Seok Park, Hyun-Kuk Purpose Built Mobility Group Korea Institute of Industrial Technology Gwangju61012 Korea Republic of Extreme Process Control Group Korea Institute of Industrial Technology Busan46938 Korea Republic of Division of Advanced Materials Engineering Chonnam National University Gwangju61186 Korea Republic of

The Copper (Cu) - Titanium (Ti) powders with varying of Ti content(0.3, 0.5, 1, 2, 4, 6, 8 wt.%) were mixed using a horizontal ball milling. The milling process was performed for 6 hrs at 300 rpm. The Cu-Ti composites were fabricated by a spark plasma sintering process at a sintering temperature of 850℃ and heating rate of 30 ℃/min under a pressure of 40 MPa. The relative density of the composites was all densified to more than 99%. The Cu and Ti in the Cu matrix are unstable to exist in a single phase at temperature range of 800-875°C and a Ti content of 4-8 at.% (3.04-6.15 wt.%). Thus, each element is stabilized by forming a secondary phase. The phase of Cu3Ti was detected upon the Ti content was 4 wt.% or higher, which affected the thermal properties. The thermal conductivity decreased from 262.74 to 46.10 W/m·K according to increase the Ti contents. The Ti present in the heat transfer path in Cu matrix acted as an obstacle to heat diffusion. Furthermore, as the Ti contents increased, the Vickers hardness of Cu-Ti composite increased from 60.19 to 205.20 kg/mm2. In contrast, the crystallite size decreased from 66.63 to 22.43 nm. The Ti particles suppressed the grain growth of the Cu matrix, resulting in a decrease in crystallite size, which contributed to the improvement of the mechanical properties. ©2025 Japan Society of Powder and Powder Metallurgy.

关键词： Thermal conductivity

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Metabolomics, network pharmacology, and microbiome analyses uncover the mechanisms of the Chinese herbal formula for the improvement of meat quality in spent hens

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Journal of Animal Science and Biotechnology 2025年第2期16卷 948-964页

作者： Zhihua Li Abul Kalam Azad Chengwen Meng Xiangfeng Kong Jue Gui Wenchao Lin Yadong Cui Wei Lan Qinghua He Department of Food Science and Engineering College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhenChina Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry ProductionInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaChina School of Biology and Food Engineering Fuyang Normal UniversityFuyangChina

Background Meat originating from the spent hen is an important source of poultry meat production;however,multiple factors cause the decline in the meat quality of spent *** herbs have been widely used as medi-cine for a long time to prevent diseases and as nutrient supplements to improve the product *** experi-ment explored the effects of adding 1.0%Chinese herbal formula(CHF,including 0.30%Leonurus japonicus Houtt.,0.20%Salvia miltiorrhiza Bge.,0.25%Ligustrum lucidum Ait.,and 0.25%Taraxacum mongolicum Hand.-Mazz.)for 120 d to the spent hens’diet through metabolomics,network pharmacology,and microbiome *** The results indicated that CHF supplementation improved the meat quality by reducing drip loss(P<0.05),b*value(P=0.058),and shear force(P=0.099)and increasing cooked meat percentage(P=0.054)and dry matter(P<0.05)of breast *** addition of CHF improved the nutritional value of breast muscle by increasing(P<0.05)the content of C18:2n-6,n-6/n-3 polyunsaturated fatty acids(PUFA),total PUFA,PUFA-to-saturated fatty acids(SFA)ratio,and hypocholesterolemic-to-hypercholesterolemic ratio,and tending to increase serine content(P=0.069).The targeted metabolomics analysis revealed that the biosynthesis of SFA,linoleic acid metabolism,fatty acid degradation,fatty acid elongation,and fatty acid biosynthesis pathways were enriched by CHF ***,the network pharmacology analysis indicated that CHF was closely associated with oxidative stress and lipid *** CHF supplementation increased the glutathione peroxidase level(P<0.05)and upregulated gene expres-sion related to the Nrf2 pathway(including HO-1,P<0.05;Nrf2,P=0.098;CAT,P=0.060;GPX1,P=0.063;and SOD2,P=0.052)and lipid metabolism(including PPARγ,P<0.05;SREBP1,P=0.059;and CPT1A,P=0.058).Additionally,CHF supplementation increased Firmicutes and decreased Bacteroidetes,Spirochaetes,and Synergistetes abundances(P<0.05),which may contribute to better meat quality.C

关键词： Cecal microbiota Chinese herbal formula Fatty acid Meat quality Network pharmacology Spent hens

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Robustness of gross primary production estimation from long-term reconstructed solar-induced chlorophyll fluorescence varies with greenness on a global scale

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Journal of Applied Remote Sensing 2025年第1期19卷

作者： Fu, Lijiang Xia, Qian Tang, Hao Chen, Junqing Tan, Jinglu Guo, Ya Jiangnan University Ministry of Education Key Laboratory of Advanced Process Control for Light Industry Wuxi China Changshu Institute of Technology School of Electrical Engineering and Automation Changshu China University of Missouri Department of Chemical and Biomedical Engineering ColumbiaMO United States

Long-term reconstructed solar-induced chlorophyll fluorescence (SIF) derived from raw gridded SIF has been used for the estimation of gross primary production (GPP), but the robustness of the spatial relationship may vary from location to location. We examined the often-used linear relationship between GPP and SIF in terms of R2 values for varied locations globally using three GPP datasets (FLUXCOM, VPM, PML) and three long-term reconstructed monthly SIF datasets (CSIF, SIF005, and RTSIF). The results show that the R2 value is a concave function of vegetation greenness level (NDVI) on an annual or seasonal basis. The average R2 is over 0.8 in areas where the annual average NDVI is in the range of 0.4 to 0.6, whereas the R2 is much lower where the annual average NDVI is less than 0.2 or greater than 0.8. Prediction of GPP or SIF by three methods from five major environmental variables revealed greater uncertainties in GPP and/or SIF at low or high greenness levels as an apparent cause of the low R2. The results offer useful insights into how global GPP may be effectively estimated from multi-satellite measured SIF. © 2025 Society of Photo-Optical Instrumentation Engineers (SPIE).

关键词： Optical correlation

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Green innovation unleashed:Harnessing tungsten-based nanomaterials for catalyzing solar-driven carbon dioxide conversion

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Chinese Chemical Letters 2025年第2期36卷 108-117页

作者： Weidan Meng Yanbo Zhou Yi Zhou State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and TechnologyShanghai 200237China National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery East China University of Science and TechnologyShanghai 200237China Shanghai Engineering Research Center for Multi-media Environmental Catalysis and Resource Utilization East China University of Science and TechnologyShanghai 200237China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Carbon dioxide photocatalytic reduction (CO_(2)-PR) is an efficient method for controlling CO_(2)emissions and generating cleaner energy while mitigating global *** oxides (WxOy) have attracted considerable attention for CO_(2)-PR due to their excellent spectral ***,comprehensive reviews are lacking on the use of WxOyfor CO_(2)-***,this review provides a detailed summary of t research progress made with WxOy-based catalysts in CO_(2)-*** also explains the fundamental principles of CO_(2)-PR and evaluates key performance indicators that affect the activity of WxOy-based photocatalysts,including yield,selectivity,stability,and apparent quantum ***,this review explores opportunities for synthesizing high-performance WxOy-based photocatalysts and highlights their potential for the green preparation of C1/C2 products through CO_(2)-*** innovative strategies aim to address the challenges and pressures associated with energy and environmental issues,particularly by enhancing artificial photosynthesis efficiency.

关键词： Carbon dioxide photoreduction Tungsten-based nanocatalyst Mechanism Performance evaluation Selectivity

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Antibiotic fermentation residue derived biochar supported cobalt ferrite as particle electrodes for peroxymonosulfate activation to complete mineralization gatifloxacin

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Journal of Industrial and engineering Chemistry 2025年 148卷 583-594页

作者： Zhang, Meng Liu, Yuxia Liu, Guanhong Ma, Wenxing Wang, Jun Liu, Lili State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resources and Environmental Engineering East China University of Science and Technology Shanghai200237 China Institute of Applied Ecology Chinese Academy of Sciences Shenyang110016 China Institute of Environmental Technology Technical University of Ostrava Ostrava-Poruba708 00 Czech Republic

In this study, antibiotic fermentation residues were pyrolyzed at low temperature to prepare biochar with low surface area and porosity, which was further used as carrier of cobalt ferrite to synthesize particle electrodes (BC@CF) for electrochemical system that adopted peroxymonosulfate (EC/BC@CF/PMS) to degrade gatifloxacin (GAT). Due to the electron transfer strengthening effect of BC and weak adsorption capacity of BC@CF, 100 % GAT degradation was achieved in EC/BC@CF/PMS system without electrolyte addition. The positively charged BC@CF could adsorb HSO5− and achieve its activation through electron transfer to produce surface-bound SO4[rad]− and [rad]OH, which were further transformed into O2[rad]− and mediate GAT degradation in reaction solution through PMS activation. The surface-bound SO4[rad]− and [rad]OH showed lower contribution to GAT degradation due to the electrostatic repulsive force between BC@CF and GAT. The complete mineralization of GAT in EC/BC@CF/PMS system was achieved by batch feeding of PMS (0, 30, and 60 min) and extension of experimental time (120 min), which was comparable in aspect of energy consumption (6.23 kWh/m3) with the reported electrochemical system that based on spinel or carbon-based particle electrodes, but featured with much higher mineralization efficiency of organic contaminant and complete detoxification of the wastewater. © 2025 The Korean Society of Industrial and engineering Chemistry

关键词： Degradation

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Identifying the dynamic behaviors in complete reconstruction of Co-based complex precatalysts during electrocatalytic oxygen evolution

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Journal of Energy Chemistry 2025年第1期100卷 226-233页

作者： Jingfang Zhang Danyang Wu Linke Cai Youluan Lu Fanpeng Cheng Lijuan Shi Qun Yi Yao Liu Yi Huang Key Laboratory of Green Chemical Engineering Process of Ministry of Education Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationHubei Key Laboratory of Novel Reactor and Green Chemical TechnologySchool of Chemical Engineering&PharmacyWuhan Institute of TechnologyWuhan 430205HubeiChina Key Laboratory of Pesticide&Chemical Biology of Ministry of Education Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction of Ministry of EducationCollege of ChemistryCentral China Normal UniversityWuhan 430079HubeiChina College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108FujianChina

Transition metal-based nanomaterials have emerged as promising electrocatalysts for oxygen evolution reaction(OER).Considerable research efforts have shown that self-reconstruction occurs on these nanomaterials under operating conditions of OER ***,most of them undergo incomplete reconstruction with limited thickness of reconstruction layer,leading to low component utilization and arduous exploration of real catalytic ***,we identify the dynamic behaviors in complete reconstruction of Co-based complexes during *** hollow phytic acid(PA)cross-linked CoFe-based complex nanoboxes with porous nanowalls are designed because of their good electrolyte penetration and mass transport ability,in favor of the fast and complete reconstruction.A series of experiment characterizations demonstrate that the reconstruction process includes the fast substitution of PA by OH-to form Co(Fe)(OH)xand subsequent potential-driven oxidation to Co(Fe)*** obtained CoFeOOH delivers a low overpotential of 290 mV at a current density of 10 mA cm^(-2)and a long-term *** experiment results together with theory calculations reveal that the Fe incorporation can result in the electron rearrangement of reconstructed CoFeOOH and optimization of their electronic structure,accounting for the enhanced OER *** work provides new insights into complete reconstruction of metal-based complexes during OER and offers guidelines for rational design of high-performance electrocatalysts.

关键词： Complete reconstruction Co-based complex Precatalysts Oxygen evolution reaction

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