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Recent patents for the motorized spindle preload mechanism

Recent Patents on Mechanical Engineering 2021年第3期14卷 329-341页

作者： Dai, Ye Wen, Wan-Jian Xuan, Li-Yu Yu, Xiao-Yang Wang, Gang Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education School of Mechanical and Power Engineering Harbin University of Science and Technology Harbin150080 China School of College of Measurement and Control Technology and Communication Engineering Harbin University of Science and Technolo-gy Harbin150080 China Ningbo Skync Five Axis Numerical Control Tech Co. Ltd Yuyao315400 China

Background: The motorized spindle preload technology is one of the motorized spindle key technologies, and adjusting the preload according to the working conditions can effectively improve the dynamic performance of the motorized spindle and enhance the machining accuracy. Objectives: Review the preload mechanism development, introduce various preload mechanisms, and show research status in recent years. Then to explore and predict the future development of preload technology through the analysis of the overall preload mechanism. Methods: Search for different kinds of patents and literature about spindle preload structure in recent years. Through structural research and comparison with the traditional preload mechanism, to review the structure principle of various preload mechanisms at the present stage, then shown the advantages and disadvantages of each structure. Result: According to the patents and research of the preload mechanism in recent years, classification introduced the piezoelectric ceramic preload device, electromagnetic preload device, and hydraulic preload device, and so on. Introduce their advantages and existing problems in detail, then comprehensively compare the advantages and disadvantages of various mechanisms in control and mechanism. Finally, discuss the prospects and development directions of preload technology. Conclusion: With the further development of technology, high-precision products have higher requirements for machine tools, such as low latency, low heat generation, high efficiency, and long life. People use electromagnetic force, air pressure, hydraulic pressure, and other methods, to control the magnitude of the preload, maintain the performance of the motorized spindle at a high level. Compared with the traditional quantitative preload, their applicable working conditions are more extensive and accuracy is higher. However, various new preload methods still have certain shortcomings and need further improvement. © 2021 Bentham Sci

关键词： Machine tools

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Large potential of strengthening the land carbon sink in China through anthropogenic interventions

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Science Bulletin 2024年第16期69卷 2622-2631页

作者： Xu Yue Hao Zhou Yang Cao Hong Liao Xiaofei Lu Zhen Yu Wenping Yuan Zhu Liu Yadong Lei Stephen Sitch Jürgen Knauer Huijun Wang Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science&Technology(NUIST)Nanjing 210044China College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China Jiangsu Nanjing Environmental Monitoring Center Nanjing 210013China Key Laboratory of Agrometeorology of Jiangsu Province Institute of EcologySchool of Applied MeteorologyNUISTNanjing 210044China Institute of Carbon Neutrality Sino-French Institute for Earth System ScienceCollege of Urban and Environmental SciencesPeking UniversityBeijing 100871China Department of Earth System Science Tsinghua UniversityBeijing 100084China State Key Laboratory of Severe Weather and Key Laboratory of Atmospheric Chemistry of CMA Chinese Academy of Meteorological SciencesBeijing 100081China College of Life and Environmental Sciences University of ExeterExeter EX44RJUK Hawkesbury Institute for the Environment Western Sydney UniversityPenrith 2751Australia Key Laboratory of Meteorological Disaster Ministry of EducationJoint International Research Laboratory of Climate and Environment ChangeCollaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNUISTNanjing 210044China

The terrestrial ecosystem in China mitigates 21%-45%of the national contemporary fossil fuel CO_(2) emissions every *** and strengthening the land carbon sink is essential for reaching China’s target of carbon ***,this sink is subject to large uncertainties due to the joint impacts of climate change,air pollution,and human ***,we explore the potential of strengthening land carbon sink in China through anthropogenic interventions,including forestation,ozone reduction,and litter removal,taking advantage of a well-validated dynamic vegetation model and meteorological forcings from 16 climate *** anthropogenic interventions,considering Shared Socioeconomic Pathways(SSP)scenarios,the land sink is projected to be 0.26-0.56 Pg C a^(-1) at 2060,to which climate change contributes 0.06-0.13 Pg C a^(-1) and CO_(2) fertilization contributes 0.08-0.44 Pg C a^(-1) with the stronger effects for higher emission *** anthropogenic interventions,under a close-to-neutral emission scenario(SSP1-2.6),the land sink becomes 0.47-0.57 Pg C a^(-1) at 2060,including the contributions of 0.12 Pg C a^(-1) by conservative forestation,0.07 Pg C a^(-1) by ozone pollution control,and 0.06-0.16 Pg C a^(-1) by 20%litter removal over planted *** sink can mitigate 90%-110% of the residue anthropogenic carbon emissions in 2060,providing a solid foundation for the carbon neutrality in China.

关键词： Carbon sink Forestation Ozone Litter removal

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Assessment and prediction of the effect of ageing on the adsorption of nonylphenol in black carbon-sediment systems

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Journal of Environmental Sciences 2021年第4期33卷 216-225页

作者： Guanghuan Cheng Han Liu Tailu Dong Qiuyu Li Mingyang Sun Liping Lou Environmental Science College of EngineeringChina Pharmaceutical UniversityNanjing 211198China Department of Environmental Engineering Zhejiang UniversityHangzhou 310058China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control(AEMPC) Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(AEET)School of Environmental Science and EngineeringNanjing University of Information Science&Technology(NUIST)Nanjing 210044China Key Laboratory of Water Pollution Control and Environmental Safety of Zhejiang Province Hangzhou 310058China

Black carbon(BC)is a promising sediment amendment,as proven by its considerable adsorption capacity for hydrophobic organic pollutants and accessibility,but its reliability when used for the removal of pollutants in natural sediments still needs to be *** example,the ageing process,resulting in changing of surface physicochemical properties of BC,will decrease the adsorption capacity and performance of BC when applied to sediment pollution *** this study,how the ageing process and BC proportion affect the adsorption capacity of BC-sediment systems was modelled and quantitatively investigated to predict their adsorption capacity under different ageing times and BC *** results showed that the ageing process decreased the adsorption capacity of both BC-sediment systems,due to the blockage of the non-linear adsorption sites of *** adsorption capacity of rice straw black carbon(RC)-sediment systems was higher than that of fly ash black carbon(FC)-sediment systems,indicating that RC is more efficient than FC for nonylphenol(NP)pollution control in *** newly established model for the prediction of adsorption capacity fits the experimental data appropriately and yields acceptable predictions,especially when based on parameters from the Freundlich ***,to fully reflect the influence of the ageing process on BC-sediment systems and make more precise predictions,it is recommended that future work considering more factors and conditions,such as modelling of the correlation between the adsorption capacity and the pore volume or specific surface area of BC,be applied to build an accurate and sound model.

关键词： Black carbon(BC) Nonylphenol(NP) Ageing Sorption Sediment

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Effects of sodium lactate injection on meat quality and lactate content in broiler chickens: emphasis on injection method and dosage

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Poultry Science 2024年第10期103卷 104084页

作者： Wang, Zhenxin Zhang, Lin Xing, Tong Zhao, Liang Gao, Feng College of Animal Science and Technology Key Laboratory of Animal Origin Food Production and Safety Guarantee of Jiangsu Province Jiangsu Collaborative Innovation Center of Meat Production and Processing Quality and Safety Control Nanjing Agricultural University

This study aims to develop an experimental model of high lactate levels in broilers to mimic the condition of birds under stress or diseases and evaluate its consequent effects on meat quality. The injection sites and dosage effects were compared separately in 2 experiments. Experiment 1 includes 3 injection sites: intraperitoneal injection, intramuscular injection, and subcutaneous injection. Experiment 2 was a dosage experiment based on the results of Experiment 1: sodium lactate intraperitoneal injection group with 1.5, 3, 6 mM concentration. The results showed that injecting sodium lactate intraperitoneally, intramuscularly, or subcutaneously all significantly decreased body weight and breast muscle weight while elevating lactic acid levels in both the blood and breast muscle of broilers. Moreover, all 3 injection methods caused a significant reduction in pH_24h and an increase in the shear force value of breast muscle. In addition, dose-response experiments of intraperitoneal injection showed that a concentration of 3 mM and 6 mM were significantly decreased body weight and breast muscle weight in broiler chickens, accompanied by a notable increase in breast muscle lactate content. Compared to the control group, intraperitoneal injections of 1.5 mM, 3 mM, and 6 mM sodium lactate treatments significantly reduced the yellowness values of the breast muscle. As the dose of sodium lactate increased, the shear force value of the breast meat exhibited linear and quadratic increments, while the drip loss decreased linearly. Intraperitoneal injection of 3 mM sodium lactate also significantly reduced the pH_24h of broiler breast muscle. In addition, an increased dose of lactate injections up-regulated the glycolytic pathway responsible for endogenous lactate production in the breast muscle by upregulating the expression of phosphofructokinase, pyruvate kinase and lactate dehydrogenase A. In conclusion, intraperitoneal injection of sodium lactate at 3

关键词： broiler chicken glycolysis injection lactic acid meat quality

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Surface catalytic degradation of ciprofloxacin by ferrihydrite sulfidation under ambient conditions

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Environmental Pollution 2025年 371卷 125945页

作者： Chen, Xiru Bai, Lihua Li, Hongjian Wang, Xinhao Wang, Chao Fang, Yanfen Gu, Cheng State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China Key Laboratory of Environmental Remediation and Ecological Health Ministry of Industry and Information·Technology Jiangsu Province Ecology and Environment Protection Engineering Research Center of Groundwater Pollution Prevention and Control Jiangsu Environmental Engineering Technology Co. Ltd. Nanjing210019 China College of Materials and Chemical Engineering China Three Gorges University Hubei Yichang443002 China

Dissolved sulfide (S(-II)) is abundant in sediments and capable of initiating the sulfidation reactions of iron-bearing minerals, in which the reaction mechanisms have been well documented. However, the impact of the S(-II)/Fe concentration ratio on reactive oxygen species (ROS) formation and the fate of co-existing contaminants upon iron-bearing minerals sulfidation under ambient conditions remains inadequately explored. Herein, the transformation of ciprofloxacin (CIP) by ferrihydrite sulfidation under ambient conditions was systematically investigated. Our findings indicated that the rate of CIP degradation initially increased with rising S(-II)/Fe concentration ratios, but subsequently decreased as the ratio continued to elevate. Evidence from electron paramagnetic resonance, molecular probing and quenching experiments revealed that the superoxide anion radical (O2•-), primarily produced from the reaction between O2 and surface-bound Fe(II), was the dominant contributor to the accelerated transformation of CIP. Upon being attacked by ROS, CIP underwent degradation via carboxyl substitution, defluorination, hydroxylation, piperazine ring ketonization and piperazine ring cleavage. Additionally, common water quality factors, i.e., pH, natural organic matter (NOM) and inorganic anions could also significantly influence the degradation processes of CIP during ferrihydrite sulfidation under ambient conditions. This research offers valuable insights into the significant function of mineral sulfidation in facilitating the formation and reactivity of ROS, which sheds light on enhanced elimination of organic contaminants in sediments. © 2025 Elsevier Ltd

关键词： Reactive oxygen species

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Enhanced piezoelectric response of Na0.5Bi0.5TiO3-BaTiO3 lead free ceramics by tuning the local polar heterogeneity

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Materials Research Bulletin 2025年 184卷

作者： Chen, Pan Yuan, Bin Wang, Jiachen Zhang, Xin Chen, Yaoguang Cao, Fengjiao Zhao, Haojie Wang, Yanquan Yuan, Xiaohui Hu, Zhongming Lian, Haojie Zhu, Feng Li, Pei Chen, Leilei Henan International Joint Laboratory of Structural Mechanics and Computational Simulation College of Architectural and Civil Engineering Huanghuai University Henan Province Zhumadian463000 China College of Energy Engineering Huanghuai University Henan Province Zhumadian463000 China College of Architecture and Civil Engineering Xinyang Normal University Xinyang464000 China Key Laboratory of In-situ Property-improving Mining of Ministry of Education Taiyuan University of Technology Shanxi Province Taiyuan030024 China College of general aviation and flight Nanjing University of Aeronautics and Astronautics Jiangsu Province Liyang213300 China State Key Laboratory of Mechanics and Control for Aerospace Structures College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Jiangsu Province Nanjing210016 China Center for Industrial Mechanics Department of Mechanical and Electrical Engineering South Denmark University Denmark

For (1-x)Na0.5Bi0.5TiO3-xBaTiO3 (NBT-BT) ceramics, the highest piezoelectric performances appears at morphotropic phase boundary (x=0.06∼0.10). Recently, quenching has been as an effective way to improve their piezoelectric performances. In this work, comparative study on normally cooled and quenched NBT-BT ceramics was conducted. We found, there is a close positive correlation between electrical properties and local polar heterogeneity. It was verified in a case study on NBBT6 ceramics by tuning the local polar heterogeneity using Bi or Sr nonstoichiometric modification. And the highest d33 ∼ 207 pC/N is obtained in Bi-modified NBT-BT ceramics. It demonstrates that, to obtain a higher d33, the factors affecting local polar heterogeneity of piezoelectric ceramics could be preferentially considered. © 2024

关键词： Piezoelectric ceramics

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controllable four-wave mixing based on quantum dot-cavity coupling system

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Communications in Theoretical Physics 2021年第5期73卷 25-32页

作者： Hong-Wu Xing Bin Chen Li-Li Xing Jian-Bin Chen Hai-Bin Xue Kang-Xian Guo Department of Physics College of Physics and OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceTaiyuan 030024China Department of Physics School of Physics and Materials ScienceGuangzhou UniversityGuangzhou 510006China

We theoretically study the four-wave mixing(FWM)response in a quantum dot-cavity coupling system,where a two-level quantum dot(QD)is placed in an optical cavity while the cavity mode is coupled to the nanomechanical resonator via radiation *** influences of the QD-cavity coupling strength,the Rabi coupling strength of the QD,and the power of the pump light on the FWM intensity are mainly *** numerical results show that the FWM intensity in this hybrid system can be significantly enhanced by increasing the QD-cavity coupling *** addition,the FWM intensity can be effectively modulated by the Rabi coupling strength and the pump ***,the effects of the cavity decay rate and the cavitypump detuning on the FWM signal are also *** obtained results may have potential applications in the fields of quantum optics and quantum information science.

关键词： four-wave mixing quantum dot-cavity coupling system input-output relation

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Analyzing the trends and hotspots of biochar’s applications in agriculture,environment,and energy:a bibliometrics study for 2022 and 2023

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Biochar 2024年第1期6卷 1390-1407页

作者： Ping Wu Yingdong Fu Tony Vancov Hailong Wang Yujun Wang Wenfu Chen Hebei Key Laboratory of Soil Ecology Hebei Key Laboratory of Agricultural Water ResourcesCenter for Agricultural Resources ResearchInstitute of Genetics and Developmental BiologyChinese Academy of SciencesShijiazhuang 050022China. School of Life Sciences Institute of Life Sciences and Green DevelopmentHebei UniversityBaoding 071002HebeiChina. NSW Department of Primary Industries Elizabeth Macarthur Agricultural Insti-tuteMenangleNSW 2568Australia. School of Environmental and Chemical Engineering Foshan UniversityFoshan 528000GuangdongChina. Guangdong Provincial Key Laboratory of Integrated Agro-Environmental Pollution Control and Management Institute of Eco-Environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China. Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008JiangsuChina. University of Chinese Academy of Sciences Beijing 100049China. Biochar Engineering and Technology Research Center of Liaoning Province Rice Research InstituteAgronomy CollegeShenyang Agricultural UniversityShenyang 110866LiaoningChina.

Biochar,produced from the thermochemical conversion of biomass waste,has various applications owing to its broad utility and advantageous *** study employs a scientometric approach to comprehensively assess the advancements in biochar application from 2022 to *** 13,357 bibliographic records sourced from the Web of Science Core Collection with the search term“biochar”,the analysis focuses on authorship,national contributions,and keyword *** demonstrate a continual rise in annual publications since 2009,albeit with a moderated growth rate in *** leads in publication outputs,followed by USA and India,with Hailong Wang emerging as a prominent figure in biochar *** co-occurrence analyses identify key research themes such as biochar’s role in climate change mitigation,easing salinity and drought stress,immobilizing toxic metals,degrading organic pollutants,serving as additives in anaerobic digestion,and functioning as electrodes in microbial fuel *** these,biochar’s application for global climate change mitigation gains significant attention,while its utilization as electrodes in microbial fuel cells emerges as a promising research frontier,indicating the growing need for sustainable energy *** study also outlines critical research gaps and future priorities for enhancing biochar ***,it highlights the diverse applicability of biochar and offers valuable insight into research progression and forthcoming directions in biochar studies.

关键词： Bibliometric analysis Research hotspots Carbon neutrality Microbial fuel cells Sustainable application

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A study on corrosion mechanism of defective fluorite-type RE2Hf2O7 (RE=Dy, Yb) material to CMAS attack at 1300 °C: Experiments and Ab initio molecular dynamics simulations

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Ceramics International 2025年

作者： Zhao, Hui Miao, Qiang Liang, Wenping Liu, Ruixiang Sun, Shijie Zhang, Xiaofeng College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Yudao Street 29 Jiangsu Province Nanjing210016 China Wuxi Research Institute Nanjing University of Aeronautics and Astronautics Luonan Street 8 Jiangsu Province Wuxi214154 China National Key Laboratory of Advanced Composites AECC Beijing Institute of Aeronautical Materials Beijing100095 China National Engineering Laboratory for Modern Materials Surface Engineering Technology Institute of New Materials Guangdong Academy of Sciences Guangzhou510651 China

The effectiveness of candidate Dy- and Yb-bearing hafnate materials as thermal barrier coatings (TBCs) in resisting CMAS (calcium-magnesia-alumina-silicon) corrosion at 1300 °C was investigated using both experimental and simulation-based approaches. The observed in-situ CMAS wetting results indicate that the dissolution of DyO1.5 into melts raises the temperature at which corrosion begins. The sticking temperature point of CMAS on the Dy2Hf2O7 surface is 1268 °C, 26 °C higher than that on the Yb2Hf2O7 surface. The experimental results indicate that compared to Yb2Hf2O7, the formation of Dy-bearing garnet products in the reaction of Dy2Hf2O7 with CMAS creates a protective layer that effectively suppresses further CMAS infiltration. The corrosion thickness of Dy2Hf2O7 is only one-half to one-third of that of Yb2Hf2O7 after 1h, 10h, and 20h exposure. The interfacial atomic diffusivity, energy barrier of atom pair and electronegativity characteristics influence the precipitation of products such as apatite and garnet along the Dy- and Yb-bearing hafnate/CMAS interface. The simulated results suggest that the exceptional Al diffusion rate (18.5014 Å2/ps), lower Al-O and Al-Dy bonding energy barriers (0.31890 eV and 0.41921 eV), and the ease of Al dissolution in CMAS polar solution enhance the formation of Dy-bearing garnet. This study explores two novel hafnate materials as TBC candidates and examines the factors influencing their performance from both chemical and physical perspectives, accompanied by a discussion of guidelines for the rare earth selection of CMAS-resistant hafnate TBCs. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Thermal barrier coatings

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Gc-Ms/Ms Combined with Sample Pretreatment of Lle-Spe for Simultaneous Analysis of Enrofloxacin and Ofloxacin Residues in Chicken Tissues and Pork

SSRN

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SSRN 2024年

作者： Pang, Maoda Xu, Junjie Tang, Yayun Guo, Yawen Ding, Hao Wang, Ran Zhang, Tao Zhang, Genxi Guo, Xiaodong Dai, Guojun Xie, Xing Xie, Kaizhou Key Laboratory of Control Technology Standard for Agri-product Safety and Quality Key Laboratory of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base Institute of Food Safety and Nutrition Jiangsu Academy of Agricultural Sciences Nanjing210014 China College of Animal Science and Technology Yangzhou University Yangzhou225009 China Key Laboratory for Veterinary Bio-Product Engineering Ministry of Agriculture and Rural Affairs Institute of Veterinary Medicine Jiangsu Academy of Agricultural Sciences Nanjing210014 China Center of Technology Innovation for Veterinary Biologicals Taizhou225300 China

A widely applicable original GC-MS/MS method was explored to measure the enrofloxacin and ofloxacin residues in chicken tissues and pork qualitatively and quantitatively. The experimental samples were processed on the basis of LLE-SPE. Trimethylsilyl diazomethane (TMSD) was chosen to react derivatively with enrofloxacin and ofloxacin. The recoveries of enrofloxacin and ofloxacin in fortified blank samples were 78.25% ~ 90.56% and 78.43% ~ 91.86% severally. The LODs were 0.7 ~ 1.0 μg/kg and 0.1 ~ 0.2 μg/kg, respectively. The LOQs were 1.6 ~ 1.9 μg/kg and 0.3 ~ 0.4 μg/kg, respectively. It is verified that various experimental data fills the bill of the FAO & WHO (2014) for veterinary drug residue detection. Real samples obtained from local markets underwent analysis using the established method, revealing no detectable residues of enrofloxacin and ofloxacin in any samples. © 2024, The Authors. All rights reserved.

关键词： Tissue

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