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Application of magnetic particles modified with amino groups to adsorb copper ions in aqueous solution

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Journal of Environmental Sciences 2011年第1期23卷 44-50页

作者： Yafen Lin huawei chen Kaelong Lin Boryann chen Chyowsan Chiou Department of Chemical and Materials Engineering 'National' l-Lan University I-Lan 260 Taiwan China Department of Cosmetic Application and Management St. Mary's Medicine Nursing and Management College l-Lan 260 Taiwan China Department of Environmental Engineering 'National' LLan University I-Lan 260 Taiwan China

A magnetic adsorbent can be easily recovered from treated water by magnetic force, without requiring further downstream treatment. In this research, amine-functionalized silica magnetite has been synthesized using N-[3-（trimethoxysilyl）propyl]-ethylenediamine （TPED） as a surface modification agent. The synthesized magnetic amine adsorbents were used to adsorb copper ions in an aqueous solution in a batch system, and the maximum adsorption was found to occur at pH 5.5± 0. 1. The adsorption equilibrium data fitted the Langmuir isotherm equation reasonably well, with a maximum adsorption capacity of 10.41 mg/g. A pseudo second-order model could best describe the adsorption kinetics, and the derived activation energy was 26.92 kJ/mol. The optimum condition to desorb Cu2＋ from NH2/SiO2/Fe304 was provided by a solution with 0.1 mol/L HNO3.

关键词： magnetic adsorbent SiO2 amine adsorb copper ion

Flow field characteristics and drag reduction performance of high-low velocity stripes on the biomimetic imbricated fish scale surfaces

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Biosurface and Biotribology 2024年第3期10卷 132-141页

作者： Dengke chen XianXian Cui huawei chen College of Transportation Ludong UniversityYantaiShandongChina School of Mechanical Engineering and Automation Beihang UniversityBeijingChina Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijingChina

Improving energy efficiency and cost reduction is a perennial challenge in *** biological systems have evolved unique functional surfaces or special physiological functions over centuries to adapt to their complex *** these biological wonders,fish,one of the oldest vertebrate groups,has garnered significant attention due to its exceptional fluid dynamics *** are actively exploring the potential of fish skin's distinctive structural and material characteristics in reducing *** this study,models of biomimetic imbricated fish scale are established,and the evolution characteristics of the flow field and drag reduction performance on these bionic surfaces are *** results showed a close relationship between the high-low velocity stripes generated and the fluid motion by the imbricated fish scale *** stripes'prominence increases with the spacing of the adjacent scales and tilt angle of the fish scale,and the velocity amplitude of the stripes decreases as the exposed length of the imbricated fish scale surface ***,the biomimetic imbricated fish scale surface can decrease the velocity gradient and thereby reduce the wall shear *** insights gained from the fish skin-inspired imbricated fish surface provide valuable perspectives for an in-depth analysis of fish hydrodynamics and offer fresh inspiration for drag reduction and antifouling strategies in engineering applications.

关键词： bionic surface drag reduction

Integrated Manufacturing Cell Formation Technology Orienting Multi-product Type and Variant Volume Production

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Chinese Journal of Mechanical Engineering 2011年第1期24卷 12-22页

作者： chen huawei WANG Aimin NING Ruxin SHAO Canxia Digital Design and Manufacturing Laboratory Beijing Institute of Technology Beijing 100081 China

What is pursued by multi-product type and variant volume（MPTVV） production is rapid response and quick switching,so that structure of transferring line in manufacturing system is no longer *** formation（CF） algorithm is the key technology of cellular manufacturing system（CMS）.Currently,CF methods are mainly extended on the idea of group technology（GT） that covers a lot on analysis of resource capability matching and its *** constraints are considered,but seldom utilized *** to the problem of manufacturing cell（MC） formation under MPTVV production mode,integrated formation technologies for typical MC as group type of cell（GC）,flow type of cell（FC） and inherited cell（IC） are presented based on technical analysis of *** to practical production constraints like delivery time,product batch,equipment ability,key machine,key part and machine sharing,etc,an integrated formation model is constructed and internal interrelations of these constraints are analyzed ***,formation goals of types of MCs and their formation procedures under joint effect of formation constraints and rules are *** case study,three highly balanced GC are formed first;then FC formation are implemented based on the same data which indicate good balancing effect of cell load and flow-style production for key tasks;When task is adjusted,a new scheme is constructed on the result of FC configuration by using IC formation method,and more optimal performance of flow-style production is *** proposed comparative study of different type of cells strongly explains the validation of integrated MC formation in support of rapid manufacturing resource transformation under MPTVV production mode.

关键词： multi-product type and variant volume production cell formation flow style manufacturing cell inheriting manufacturing cell

Controllable deformation based self-adaptive drag reduction for complex surface

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Biosurface and Biotribology 2023年第1期9卷 17-23页

作者： Dengke chen Xianxian Cui huawei chen College of Transportation Ludong UniversityYantaiShandongChina School of Mechanical Engineering and Automation Beihang UniversityBeijingChina Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijingChina

Reduction of energy consumption and improvement of cruising speed are greatly necessary for underwater ***,regular riblets have been machined and the drag reduction has been verified;however,the riblet parameters are not adjusted like the denticles of sharkskin,which adapt quickly to the complex changing fluid *** achieve an improved drag reduction effect on the complicated shape surface,a simple,low-cost,and timesaving stretching approach was proposed to adjust the riblet parameters on the underwater vehicle surface by controllable *** latex rubber membrane with regular micro-riblets was prepared as a stretching flexible film,and the spacing and height of the micro-riblets were adjusted by adaptive control of the stretching *** circulating water channel experiment verified the effectiveness and feasibility of the selfadaptive drag reduction by the controllable deformation *** results demonstrated that the drag reduction rate of the controllable deformation bionic fish skin was 4.26%compared with a smooth surface at 0.25 m/s with an angle of attack of 0°,which is better than any other *** controllable deformation bionic fish skin provides a feasible method for the drag reduction of complex surface adaptive underwater vehicles.

关键词： biointerface bionic design biosurface friction

Layout Planning Technology of Cellular Manufacturing System Based on Process Interconnection Analysis

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Chinese Journal of Mechanical Engineering 2011年第6期24卷 1035-1044页

作者： chen huawei WANG Aimin NING Ruxin SHAO Canxia Digital Design and Manufacturing Laboratory Beijing Institute of TechnologyBeijing 100081China

With sustaining change of production mode,layout planning is no longer a thing built once for *** layout(CL) is becoming a hotspot in the research field of manufacturing system *** researches on layout planning are mainly concentrating on aspects of layout arithmetic,style and evaluation,*** seldom efforts are paid to CL and its specific problems as cell formation(CF),equipment sharing and CL *** problem analyzing of layout in cellular manufacturing system(CMS),research approach of cell formation,interactive layout and layout analysis threaded with process interconnection relationship(PIR) is *** key technologies in CL like CF technology based on similarity analysis of part processes,interactive visual layout technology,layout evaluation technology founded on PIR analysis and algorithm of cell equipment sharing are put *** the background of one enterprise which encounters problems of low utility of key equipments and disperse material logistic,an example of four-cell layout is *** CL adjustment and analysis results show that equipment with high level of sharing degree should be disposed around the boundary of its main cell,and be near to other sharing cells as possible; process route should be centralized by all means,so equipment adjustment is to be implemented along direction that route intersection can be decreased; giving consideration to the existence of discrete cell,logistic route and its density should be centralized to cells *** proposed research can help improve equipment utility and material logistic efficiency of CL,and can be popularized to other application availably.

关键词： cellular manufacturing system, layout planning process interconnection relationship cell formation equipment sharing interactive layout

Special algorithm of enhancing underwater targetradiated dynamic line spectrum

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Journal of Systems Engineering and Electronics 2005年第4期16卷 797-801页

作者： Guo Yecai Zhao Junwei chen huawei Anhui Univ. of Science and Technology Huainan 232001 P. R. China Inst. of Acoustic Engineering Northwestern Polytechnical Univ. Xi'an 710072 P. R. China

Performance of traditional adaptive line enhancer （ALE） in suppressing Gaussian noise is low and can get worse at low input signal-to-noise ratio（SNR）. For greatly overcoming these disadvantages, feature of fourth-order cumulant （FOC） different slices for quasi-stationary random process is analyzed, fourth order cumulant（FOC） different slice-based adaptive dynamic line enhancer is presented, and output SNR of the proposed enhancer is derived and bigger than that of the ALE via theoretical analysis. Simulation tests with the underwater moving target-radiated data have shown that the proposed enhancer outperforms the ALE in suppressing Gaussian noise and enhancing dynamic line spectrum feature.

关键词： higher-order cumulant different slice dynamic line spectrum underwater moving target Gaussian noise.

Biomimetic Drag Reduction Study on Herringbone Riblets of Bird Feather

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Journal of Bionic Engineering 2013年第3期10卷 341-349页

作者： huawei chen Fugang Rao Xiaopeng Shang Deyuan Zhang Ichiro Hagiwara School of Mechanical Engineering and Automation Beihang University Beijing 100191 P. R. China Department of Mechanical Science and Engineering Tokyo Institute of Technology Tokyo 152-8550 Japan

Birds have gradually formed various excellent structures such as streamlined shape and hollow shaft of feather to improve their flying performance by millions of years of natural selection. As typical property of bird feather, herringbone riblets align along the shaft of each feather, which is caused by perfect link of barbs, especially for the primary and secondary feathers of wings. Such herringbone riblets of feather are assumed to have great impact on drag reduction. In this paper, microstructures of secondary feathers of adult pigeons are investigated by SEM, and their structural parameters are statistically obtained. Based on quantitative analysis of feather structure, novel biomimetic herringbone riblets with narrow smooth edge are proposed to reduce surface drag. In comparison with traditional microgroove riblets and other drag reduction structures, the drag reduction rate of the proposed biomimetic herringbone riblets is experimentally clarified up to 16%, much higher than others. Moreover, the drag reduction mechanism of herringbone riblets are also confirmed and exploited by CFD.

关键词： biomimetic surface drag reduction herringbone riblets bird feather

Applications of bioinspired approaches and challenges inmedical devices

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Bio-Design and Manufacturing 2021年第1期4卷 146-148页

作者： huawei chen Yi Zhang Liwen Zhang Xilun Ding Deyuan Zhang School of Mechanical Engineering and Automation Beihang UniversityBeijingChina Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijingChina

Urgent requirements of medical devices Precision medicine has gradually become a development strategy in many countries and attracted worldwide attention in recent years due to the increasing concerns in public *** the definition of precision medicine has less or more difference from the viewpoints of different fields,the demands on the properties of medical devices or medical materials involving biocompatibility and anti-thrombosis are gradually growingmuch more diverse and much more urgent than ever[1].This trend brings up many new research topics about materials,mechanical systems and sensors to develop advanced medical *** to design and on-demand fabricate the bio-materials,bio-interface and bio-systems to meet the urgent demands of medical devices is still a challenge for us.

关键词： interface urgent viewpoint

Bioinspired Functional Surfaces for Medical Devices

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Chinese Journal of Mechanical Engineering 2022年第3期35卷 37-50页

作者： Liwen Zhang Guang Liu Yurun Guo Yan Wang Deyuan Zhang huawei chen School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100191China

Medical devices are a major component of precision medicine and play a key role in medical treatment,particularly with the rapid development of minimally invasive surgery and wearable *** tissue contact properties strongly affect device performance and patient health(e.g.,heat coagulation and slipperiness on surgical graspers).However,the design and optimization of these device surfaces are still indistinct and have no supporting *** such conditions,natural surfaces with various unique functions can provide *** review summarizes the current progress in natural functional surfaces for medical devices,including ultra-slipperiness and strong wet *** underlying mechanisms of these surfaces are attributed to their coupling effects and featured micronano *** on various medical requirements,adaptable designs and fabrication methods have been ***,various medical device surfaces have been validated to achieve enhanced contact *** on these studies,a more promising future for medical devices can be achieved for enhanced precision medicine and human health.

关键词： Bioinspired functional surfaces Medical devices Wet attachment Interfacial liquid Micro-nano structures Wearable devices