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Cytotoxicity of fullerenols on Tetrahymena pyriformis

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Nuclear Science and Techniques 2006年第5期17卷 280-284页

作者： zhao qun-fen ZHU Ying RAN Tie-Cheng LI Jun-Gang LI Qing-Nuan LI Wen-Xin Laboratory of Nano Biology and Medicine Shanghai Institute of Applied Physics the Chinese Academy of Sciences Shanghai 201800 China Faculty of Life Science and Bioengineering Ningbo University Ningbo 315211 China

With the increasing use of fullerenes and their derivatives in a variety of fields, the toxicity and effects of fullerenes on humans and the environment have received considerable attention. In this study, the cytotoxicity of fullerene derivative, C60(OH)x, on Tetrahymena pyriformis was investigated. Cell growth inhibition was evaluated by counting with an optical microscope, and the generation time was calculated. It was indicated that the fullerenols caused a dose-dependent growth inhibition of the cells. The morphologic change in the damaged macronucleus of cells was observed using a fluorescent microscope. Superoxide dismutase (SOD), glutathione peroxidase (GSH-PX), and glutathione reductase (GR) levels were also measured for Tetrahymena pyriformis, using conventional methods. The results showed that fullerenols could reduce GSH-PX and GR activities. But no noticeable difference in SOD ac- tivity was observed between the treated groups and the control group. This indicated that the antiproliferative effect of fullerenols might be mediated by the reduction in the activities of GSH-PX and GR of cells and the destruction of the macronucleus.

关键词：细胞毒性四膜虫属梨状肌富勒醇过氧化物歧化酶谷胱甘肽过氧化酶

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纳米氧化锌对斑马鱼鳃组织的氧化损伤

水生生物学报 2016年第2期40卷 395-402页

作者：刘林赵群芬宁波大学海洋学院宁波315211

纳米颗粒是指粒径在1-100nm，表面积较大，具有块状颗粒所没有的特有性质。由于纳米颗粒具有独特的理化性质，近年来合成和生产纳米颗粒的产量大大增加。纳米氧化物颗粒在科研和工业产品的应用正在逐年增加，科学家预测依靠纳米技术创... 详细信息

纳米颗粒是指粒径在1-100nm，表面积较大，具有块状颗粒所没有的特有性质。由于纳米颗粒具有独特的理化性质，近年来合成和生产纳米颗粒的产量大大增加。纳米氧化物颗粒在科研和工业产品的应用正在逐年增加，科学家预测依靠纳米技术创造的产品产生的价值，到2015年可能达到1万亿美元。

关键词：斑马鱼 nZnO 鳃组织氧化损伤

Identification of reservoir types in deep carbonates based on mixedkernel machine learning using geophysical logging data

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Petroleum Science 2024年第3期21卷 1632-1648页

作者： Jin-Xiong Shi Xiang-Yuan zhao Lian-Bo Zeng Yun-zhao Zhang Zheng-Ping Zhu Shao-qun Dong Key Laboratory of Exploration Technologies for Oil and Gas Resources of the Ministry of Education Yangtze UniversityWuhan4310HubeiChina School of Geosciences Yangtze UniversityWuhan430100HubeiChina College of Geosciences China University of Petroleum(Beijing)Beijing102249China Petroleum Exploration and Production Research Institute of SINOPEC Beijing100083China School of Earth Sciences and Engineering Xi'an Shiyou UniversityXi'an 710065ShaanxiChina

Identification of reservoir types in deep carbonates has always been a great challenge due to complex logging responses caused by the heterogeneous scale and distribution of storage *** cross-plot analysis and empirical formula methods for identifying reservoir types using geophysical logging data have high uncertainty and low efficiency,which cannot accurately reflect the nonlinear relationship between reservoir types and logging ***,the kernel Fisher discriminant analysis(KFD),a kernel-based machine learning technique,attracts attention in many fields because of its strong nonlinear processing ***,the overall performance of KFD model may be limited as a single kernel function cannot simultaneously extrapolate and interpolate well,especially for highly complex data *** address this issue,in this study,a mixed kernel Fisher discriminant analysis(MKFD)model was established and applied to identify reservoir types of the deep Sinian carbonates in central Sichuan Basin,*** MKFD model was trained and tested with 453 datasets from 7 coring wells,utilizing GR,CAL,DEN,AC,CNL and RT logs as input *** particle swarm optimization(PSO)was adopted for hyper-parameter optimization of MKFD *** evaluate the model performance,prediction results of MKFD were compared with those of basic-kernel based KFD,RF and SVM ***,the built MKFD model was applied in a blind well test,and a variable importance analysis was *** comparison and blind test results demonstrated that MKFD outperformed traditional KFD,RF and SVM in the identification of reservoir types,which provided higher accuracy and stronger *** MKFD can therefore be a reliable method for identifying reservoir types of deep carbonates.

关键词： Reservoir type identification Geophysical logging data Kernel Fisher discriminantanalysis Mixedkernel function Deep carbonates

A Comprehensive Study of a Low-Grade Heat-Driven Cooling and Power System Based on Heat Current Method

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Journal of Thermal Science 2024年第4期33卷 1523-1541页

作者： zhao Tian XU Ronghong XIN Yonglin HE Kelun MA Huan YUAN Mengdi CHEN qun School of Energy Storage Science and Engineering North China University of TechnologyBeijing100144China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering MechanicsTsinghua UniversityBeijing100084China

Combined cooling and power(CCP)system driven by low-grade heat is promising for improving energy *** work proposes a CCP system that integrates a regenerative organic Rankine cycle(RORC)and an absorption chiller on both driving and cooling fluid *** system is modeled by using the heat current method to fully consider nonlinear heat transfer and heat-work conversion constraints and resolve its behavior *** off-design system simulation is performed next,showing that the fluid inlet temperatures and flow rates of cooling water as well as RORC working fluid strongly affect system *** off-design operation even becomes infeasible when parameters deviate from nominal values largely due to limited heat transfer capability of components,highlighting the importance of considering heat transfer constraints via heat current *** optimization aiming to minimize the total thermal conductance is also *** efficiency increases by 7.9%and decreases by 12.4%after optimization,with the hot fluid inlet temperature increase from 373.15 to 403.15 K and mass flow rate ranges from 10 to 30 kg/s,emphasizing the necessity of balancing system cost and performance.

关键词： combined cooling and power system organic Rankine cycle absorption chiller cascade heat utilization heat current method off-design analysis

Supramolecular Macrocycle Regulated Single-Atom MoS2@Co Catalysts for Enhanced Oxygen Evolution Reaction

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Energy & Environmental Materials 2024年第5期7卷 287-295页

作者： Shuai Cao Wenzhuo Wu Chaozhong Liu Leqian Song qun Xu Huacheng Zhang Yanli zhao School of Chemical Engineering and Technology Xi’an Jiaotong University Henan Institute of Advanced Technology Zhengzhou University Department of Materials Science and Engineering Zhengzhou University School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University

The development of active water oxidation catalysts for water splitting has stimulated considerable interest. Herein, the design and building of single atom Co sites using a supramolecular tailoring strategy are reported, that is,the introduction of pillar[4]arene[1]quinone （P4A1Q） permits mononuclear Co species stereoelectronically assembled on MoS2matrix to construct an atomically dispersed MoS2@Co catalyst with modulated local electronic structure, definite chemical environment and enhanced oxygen evolution reaction performance. Theoretical calculations indicate that immsobilized single-Co sites exhibit an optimized adsorption capability of oxygencontaining intermediates, endowing the catalyst an excellent electrocatalytic oxygen evolution reaction activity, with a low overpotential of 370 mV at10 mA cm-2and a small Tafel slope of 90 mV dec-1. The extendable potential of this strategy to other electrocatalysts such as MoS2@Ni and MoS2@Zn, and other applications such as the hydrogen evolution reaction was also demonstrated. This study affords new insights into the rational design of single metal atom systems with enhanced electrocatalytic performance.

关键词： electrocatalysis oxygen evolution reaction pillararenequinone single atoms transition-metal dichalcogenides

Numerical Prediction of Ride Comfort of Tracked Vehicle Equipped with Novel Flexible Road Wheels

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Chinese Journal of Mechanical Engineering 2024年第4期37卷 277-289页

作者： Yaoji Deng Zhiyue Wang Youqun zhao Junjie Gong Hui Shen fen Lin College of Mechanical Engineering Yangzhou UniversityYangzhou 225127China College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Enhancing ride comfort has always constituted a crucial focus in the design and research of modern tracked vehicles,heavily reliant on the driving system's *** the road wheel is a key component of the driving system,traditional road wheels predominantly adopt a solid structure,exhibiting subpar adhesion performance and damping effects,thereby falling short of meeting the demands for high-speed,stable,and long-distance driving in tracked *** this issue,this paper proposes a novel type of flexible road wheel(FRW)characterized by a catenary *** study investigates the ride comfort of tracked vehicles equipped with flexible road wheels by integrating finite element and vehicle ***,three-dimensional(3D)finite element(FE)models of both flexible and rigid road wheels are established,considering material and contact *** models are validated through a wheel radial loading *** on the validated FE model,the paper uncovers the relationship between load and radial deformation of the road wheel,forming the basis for a nonlinear mathematical ***,a half-car model of a tracked vehicle with seven degrees of freedom is established using Newton's second law.A random road model,considering the track effect and employing white noise,is *** study concludes by examining the ride comfort of tracked vehicles equipped with flexible and rigid road wheels under various speeds and road *** results demonstrate that,in comparison to the rigid road wheel(RRW),the flexible road wheel enhances the ride comfort of tracked vehicles on randomly uneven *** research provides a theoretical foundation for the implementation of flexible road wheels in tracked vehicles.

关键词： Ride comfort Flexible road wheel Finite element model Dynamic model Tracked vehicle

Development of wet adhesion of honeybee arolium incorporated polygonal structure with three-phase composite interfaces

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Friction 2024年第2期12卷 215-230页

作者： Lulu LIANG Jieliang zhao qun NIU Li YU Xiangbing WU Wenzhong WANG Shaoze YAN Zhenglei YU School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Division of Intelligent and Biomechanical Systems State Key Laboratory of TribologyDepartment of Mechanical EngineeringTsinghua UniversityBeijing 100084China Key of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China

Inspired by the dynamic wet adhesive systems in nature,various artificial adhesive surfaces have been developed but still face different ***,the theoretical mechanics of wet adhesives has never been sufficiently ***,we develop a novel adhesive mechanism for governing wet adhesion and investigate the biological models of honeybee arolium for reproducing the natural wet adhesive ***-nano structures of honeybee arolium and arolium-prints were observed by Cryogenic scanning electron microscopy(Cryo-SEM),and the air pockets were found in the contact interface ***,the adhesive models with a three-phase composite interface(including air pockets,liquid secretion,and hexagonal frames of arolium),were formed to analyze the wet adhesion of honeybee *** results of theoretical calculations and experiments indicated an enhanced adhesive mechanism of the honeybee by liquid self-sucking effects and air-embolism *** these effects,normal and shear adhesion can be adjusted by controlling the proportion of liquid secretion and air pockets in the contact ***,the air-embolism effects contribute to the optimal coupling of smaller normal adhesion with greater shear adhesion,which is beneficial for the high stride frequency of *** works can provide a fresh perspective on the development of bio-inspired wet adhesive surfaces.

关键词： honeybee arolium air pockets wet adhesion a three-phase interface self-sucking effects air-embolism effects

基于ESO的机械弹性电动轮式车辆稳定性控制

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吉林大学学报（工学版） 2024年第1期54卷 44-54页

作者：赵又群林涛林棻沈峘南京航空航天大学能源与动力学院南京210016

针对机械弹性电动轮(MEEW)式车辆的稳定性控制问题,考虑到车辆在实际行驶时存在的一些MEEW内部摄动和外部干扰,建立了存在非线性干扰项的2自由度车辆模型。基于上述模型对整车进行稳定性分层控制,在上层中分别设计了基于扩张状态观测器(... 详细信息

针对机械弹性电动轮(MEEW)式车辆的稳定性控制问题,考虑到车辆在实际行驶时存在的一些MEEW内部摄动和外部干扰,建立了存在非线性干扰项的2自由度车辆模型。基于上述模型对整车进行稳定性分层控制,在上层中分别设计了基于扩张状态观测器(ESO)的横摆角速度和质心侧偏角滑模控制器。通过ESO对非线性干扰项进行实时的观测和补偿。依据β-β相平面对车辆的稳定性区域进行划分,并基于此对上述两个控制器进行平滑切换。在下层控制器中,基于二次规划方法进行转矩分配。仿真实验结果表明:在考虑干扰的情况下,本文横摆稳定性控制器能够很好地控制匹配MEEW的分布式驱动电动车的稳定性。

关键词：扩张状态观测器机械弹性电动轮横摆稳定性控制非线性干扰项滑模控制

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Cu/Mo2C synthesized through Anderson-type polyoxometalates modulate interfacial water structure to achieve hydrogen evolution at high current density

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Nano Research 2024年第4期17卷 2546-2554页

作者： Dunyuan Jin fen Qiao Yan Zhou Junfeng Wang Kecheng Cao Jing Yang Jikang zhao Lei Zhou Haitao Li School of Energy and Power Engineering Jiangsu UniversityZhenjiang 212013China School of Physical Science and Technology and Shanghai Key Laboratory of High-resolution Electron Microscopy ShanghaiTech UniversityShanghai 201210China Institute for Energy Research Jiangsu UniversityZhenjiang 212013China

The development of efficient non-precious metal catalysts is important for the large-scale application of alkaline hydrogen evolution reaction(HER).Here,we synthesized a composite catalyst of Cu and Mo_(2)C(Cu/Mo_(2)C)using Anderson-type polyoxometalates(POMs)synthesized by the facile soaking method as *** electronic interaction between Cu and Mo_(2)C drives the positive charge of Cu,alleviating the strong adsorption of hydrogen at the Mo site by modulating the d-band center of Mo_(2)*** studying the interfacial water structure using in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy(ATR-SEIRAS),we determined that the positively charged Cu crystals have the function of activating water molecules and optimizing the interfacial water *** interfacial water of Cu/Mo_(2)C contains a large amount of free water,which could facilitate the transport of reaction *** to activated water molecules and optimized interfacial water structure and hydrogen adsorption energy,the overpotential of Cu/Mo_(2)C is 24 mV at a current density of 10 mA·cm^(-2) and 178 mV at a current density of 1000 mA·cm^(-2).This work improves catalyst performance in terms of interfacial water structure optimization and deepens the understanding of water-mediated catalysis.

关键词： electrocatalytic hydrogen production interfacial water charge transport d band center in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy(ATR-SEIRAS)