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2024 International design Society Conference, design 2024

作者： Soika, Johannes Wanninger, Tobias Muschak, Patrick Schwaminger, Sebastian Berensmeier, Sonja Zimmermann, Markus Laboratory for Product Development and Lightweight Design TUM School of Engineering and Design Technical University of Munich Germany Bioseparation Engineering TUM School of Engineering and Design Technical University of Munich Germany Division of Medicinal Chemistry Otto Loewi Research Center Medical University of Graz Austria Munich Institute for Integrated Materials Energy and Process Engineering Technical University of Munich Germany

Lab-on-a-Chip (LOC) products for point-of-care diagnostics have gained significant attention. However, there is a lack of systematic approaches for LOC product development. To address this, we introduce an Attribute Dependency Graph exemplary for a magnetophoretic LOC system for pathogen detection. This model organizes dependencies between the design variables and crucial quantities of interest, such as detectability, cost per test, and test duration. The obtained model helps to manage design complexity and can be adapted to other LOC approaches. © 2024 Proceedings of the design Society. All rights reserved.

关键词： Lab-on-a-chip

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Advanced nonlinear rheology magnetorheological finishing:A review

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中国航空学报（英文版） 2024年第4期37卷 54-92页

作者： Feng ZHAO Zhenyu ZHANG Jianjun YANG Jiaxin YU Junyuan FENG Hongxiu ZHOU Chunjing SHI Fanning MENG State Key Laboratory of High-performance Precision Manufacturing Dalian University of TechnologyDalian 116024China Facility Design and Instrumentation Institute China Aerodynamics Research and Development CenterMianyang 621000China Key Laboratory of Testing Technology for Manufacturing Process Ministry of EducationSouthwest University of Science and TechnologyMianyang 621010China School of Energy and Power Engineering Dalian University of TechnologyDalian 116024China School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou 310018China

High-performance devices usually have curved surfaces,requiring high accuracy of shape and low surface *** is a challenge to achieve high accuracies for form and position on a device with low surface ***,due to the unique nonlinear rheology,magnetorheo-logical fluids with hard abrasives are widely applied in ultra-precision surface *** with conventional mechanical finishing,magnetorheological finishing displays obviously advan-tages,such as high precision shape of machined surface,low surface roughness and subsurface dam-age,and easy control for finishing ***,finishing performance depends on various factors,*** fraction and distribution of magnetic particles,types of hard abrasives and additives,strength of magnetic field,finishing ***,a comprehensive review on related works is essential to understand the state-of-the-art of magnetorheological finishing and beneficial to inspire researchers to develop lower cost,higher machining accuracy and efficient approaches and setups,which demonstrates a significant guidance for development of high-performance parts in fields of aerospace,navigation and clinical medicine *** review starts from the rheological property of magnetorheological fluids,summarizing dynamically nonlinear rheological properties and stable finishing ***,the effect of components in magnetorheological fluids is dis-cussed on finishing performance,consisting of magnetic particles,carrier fluid,additives and *** configuration of magnetorheological fluids,and different magnetorheological finishing methods are presented for variously curved *** addition,the current finishing forms and future directions are also addressed in this review.

关键词： Finishing approaches Finishing performance Magnetorheological finishing Magnetorheological fluids Rheological property

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Characteristics of debris flow impact on a double-row slit dam

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Journal of Mountain Science 2023年第2期20卷 415-428页

作者： WANG Zhuang LIU Dao-chuan YOU Yong LYU Xiao-bo LIU Jin-feng ZHAO Wan-yu SUN Hao WANG Dong-wei LIU Yang Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China Sichuan Highway Planning SurveyDesign and Research Institute Ltd.Chengdu 610041China Sichuan Tongchuan Engineering Technology Development Co. Ltd.Chengdu 610041China State Grid Sichuan Electric Power Transmission&Transformation Construction Co. Ltd.Chengdu 610051China

To accurately predict impact loads can ensure the safe operation of debris flow control *** instantaneous impact process is usually considered in the calculation of the debris flow impact force;however,the redistribution of an impact load after structural regulation is *** this study we deduced the theoretical calculation of a debris flow impact on a double-row slit dam,and carried out a verification experiment on the debris flow *** calculation model considers the influence of the debris flow properties,dam arrangement and pile *** results show that the impact force of the debris flow is obviously affected by the bulk *** the bulk density is 21 kg/m^(3),the maximum impact force on the pile dam is 1.15 times that when the bulk density is 15 kg/m^(3),but the time it takes for the debris flow to pass through the dam body is reduced by 60%.The larger the relative pile spacing,the more sufficient the flow space and the lower the maximum impact *** maximum impact force of relative pile spacing of 0.8 is 12%less than that of elative pile spacing of *** horizontal distribution of the impact force in the mud depth range is *** maximum impact force on the centre pier is 1.3 times that of a side pier,and the maximum impact force on the dam body appears at the top of the mud depth *** the vertical distribution of the impact force,the maximum impact force at the highest mud mark is approximately 70%of that of the *** the increase in the relative pile spacing,the longitudinal maximum impact force distribution first decreases and then increases.

关键词： Debris flow force Slit dam Fluctuations Flume model test

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Energy characteristics of urban buildings: Assessment by machine learning

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Building Simulation 2021年第1期14卷 179-193页

作者： Wei Tian Chuanqi Zhu Yu Sun Zhanyong Li Baoquan Yin Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry&Food Machinery and Equipment College of Mechanical EngineeringTianjin University of Science and TechnologyTianjin300222China Tianjin International Joint Research and Development Center of Low-Carbon Green Process Equipment Tianjin300222China School of Architecture Harbin Institute of TechnologyHarbin150090China Tianjin Architecture Design Institute Tianjin300074China

Machine learning techniques have attracted more attention as advanced data analytics in building energy ***,most of previous studies are only focused on the prediction capability of machine learning algorithms to provide reliable energy estimation in *** learning also has great potentials to identify energy patterns for urban buildings except for model ***,this paper explores energy characteristic of London domestic properties using ten machine learning algorithms from three aspects:tuning process of learning model;variable importance;spatial analysis of model *** results indicate that the combination of these three aspects can provide insights on energy patterns for urban *** tuning process of these models indicates that gas use models should have more terms in comparison with electricity in London and the interaction terms should be considered in both gas and electricity *** rankings of important variables are very different for gas and electricity prediction in London residential buildings,which suggests that gas and electricity use are affected by different physical and social ***,the importance levels for these key variables are markedly different for gas and electricity *** are much more important variables for electricity use in comparison with gas use for the importance levels over *** areas with larger model discrepancies can be determined using the local spatial analysis based on these machine learning *** identified areas have significantly different energy patterns for gas and electricity *** research is required to understand these unusual patterns of energy use in these areas.

关键词： urban buildings energy characteristics machine learning variable importance spatial analysis

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Energy and carbon performance of urban buildings using metamodeling variable importance techniques

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Building Simulation 2021年第3期14卷 535-547页

作者： Yunliang Liu Wei Tian Xiang Zhou School of Mechanical Engineering Tongji UniversityShanghai 200092China Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry&Food Machinery and Equipment College of Mechanical EngineeringTianjin University of Science and TechnologyTianjin 300222China Tianjin International Joint Research and Development Center of Low-Carbon Green Process Equipment Tianjin 300222China

Global urbanization causes more environmental stresses in cities and energy efficiency is one of major concerns for urban *** variable importance techniques have been widely used in building energy analysis to determine key factors influencing building energy *** of these applications,however,use only one type of variable importance ***,this paper proposes a procedure of conducting two types of variable importance analysis(predictive and variance-based)to determine robust and effective energy saving measures in urban *** two variable importance methods belong to metamodeling techniques,which can significantly reduce computational cost of building energy simulation models for urban *** predictive importance analysis is based on the prediction errors of metamodels to obtain importance rankings of inputs,while the variance-based variable importance can explore non-linear effects and interactions among input variables based on variance *** campus buildings are used to demonstrate the application of the method proposed to explore characteristic of heating energy,cooling energy,electricity,and carbon emissions of *** results indicate that the combination of two types of metamodeling variable importance analysis can provide fast and robust analysis to improve energy efficiency of urban *** carbon emissions can be reduced approximately 30%after using a few of effective energy efficiency measures and more aggressive measures can lead to the 60%of reduction of carbon ***,this research demonstrates the application of parallel computing to expedite building energy analysis in urban environment since more multi-core computers become increasingly available.

关键词： urban buildings variable importance metamodeling energy performance carbon emissions

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A novel approach of jet polishing for interior surface of small-grooved components using three developed setups

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极端制造(英文) 2024年第2期6卷 426-446页

作者： Qinming Gu Zhenyu Zhang Hongxiu Zhou Jiaxin Yu Dong Wang Junyuan Feng Chunjing Shi Jianjun Yang Junfeng Qi State Key Laboratory of High-performance Precision Manufacturing Dalian University of TechnologyDalian 116024People's Republic of China School of Energy and Power Engineering Dalian University of TechnologyDalian 116024People's Republic of China Key Laboratory of Testing Technology for Manufacturing Process Ministry of EducationSouthwest University of Science and TechnologyMianyang 621010People's Republic of China State Key Laboratory of High-performance Precision Manufacturing Dalian University of TechnologyDalian 116024People's Republic of China Beijing Spacecraft Manufacturing Co. LtdChina Academy of Space TechnologyBeijing 100094People's Republic of China School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhouZhejiangPeople's Republic of China Facility Design and Instrumentation Institute China Aerodynamics Research and Development Center(CARDC)Mianyang 621000People's Republic of China Beijing Spacecraft Manufacturing Co. LtdChina Academy of Space TechnologyBeijing 100094People's Republic of China

It is a challenge to polish the interior surface of an additively manufactured component with complex structures and groove sizes less than 1 *** polishing methods are disabled to polish the component,meanwhile keeping the structure *** overcome this challenge,small-grooved components made of aluminum alloy with sizes less than 1 mm were fabricated by a custom-made printer.A novel approach to multi-phase jet(MPJ)polishing is proposed,utilizing a self-developed polisher that incorporates solid,liquid,and gas *** contrast,abrasive air jet(AAJ)polishing is recommended,employing a customized polisher that combines solid and gas *** jet polishing,surface roughness(Sa)on the interior surface of grooves decreases from pristine 8.596 μm to 0.701 μm and 0.336 μm via AAJ polishing and MPJ polishing,respectively,and Sa reduces 92％and 96％,***,a formula defining the relationship between linear energy density and unit defect volume has been *** optimized parameters in additive manufacturing are that linear energy density varies from 0.135 J mm-1 to 0.22 J *** unit area defect volume achieved via the optimized parameters decreases to 1/12 of that achieved via non-optimized *** fluid dynamics simulation results reveal that material is removed by shear stress,and the alumina abrasives experience multiple collisions with the defects on the heat pipe groove,resulting in uniform material *** is in good agreement with the experimental *** novel proposed setups,approach,and findings provide new insights into manufacturing complex-structured components,polishing the small-grooved structure,and keeping it unbroken.

关键词： aluminum alloy abrasive air jet polishing multi-phase jet polishing interior curved surface small-grooved component

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Directional Rebound of Compound Droplets on Asymmetric Self-Grown Tilted Mushroom-Like Micropillars for Anti-Bacterial and Anti-Icing Applications

SSRN

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SSRN 2023年

作者： Yang, Yi Zhang, Yachao Li, Guoqiang Zhang, Miaoqi Song, Yuegan Liu, Sengyun Cai, Yong Wu, Dong Chu, Jiaru Hu, Yanlei Key Laboratory of Testing Technology for Manufacturing Process Ministry of Education Southwest University of Science and Technology Mianyang621010 China Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Mechanical Behavior and Design of Materials Key Laboratory of Precision Scientific Instrumentation Anhui Higher Education Institutes Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Hefei230027 China Key Laboratory of Icing and Anti/De-icing China Aerodynamics Research and Development Center Sichuan Mianyang621000 China

Directional liquid bouncing is of great significance for a variety of biological and industrial applications. Although surface engineering through 3D printing or self-assembly enables water droplets to rebound directionally, directional bouncing of compound droplets still poses a challenge due to their low surface tension. Moreover, preparation of superamphiphobic surfaces in an efficient and simple manner to accomplish this mission remains to be studied. Here, a tilted stepped mushroom-like micropillar surface (TSMMs), whose structural morphology can be created and tailored by a facile and direct femtosecond laser-induced asymmetric self-growing strategy, is designed to enable the oblique quasi-pancake bouncing of a low surface tension droplet (γ = 32 mN/m). Oblique quasi-pancake bouncing can not only reduce the droplet contact time (7 ms) but also effectively control the direction of droplet bouncing (the horizontal distance of 2.4 cm). Accompanying mechanistic analysis provides an in-depth understanding of the structure-droplet motion relationship. Finally, we demonstrate the applications of TSMMs in antibacterial and anti-icing scenarios. This work advances the investigation of directed droplet transportation, and paves new avenues in the fields of advanced biomedical and other industrial materials. © 2023, The Authors. All rights reserved.

关键词： Femtosecond lasers

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One-Pot Synthesis of Visible-Light Responsive Biocl/Biobr/G-C3n4 Ternary Heterojunction for Efficient Photocatalytic Sterilization

SSRN

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SSRN 2025年

作者： Cheng, Lijun Shi, Jianhua Yao, Bingjing Peng, Yiyun Li, Wenhui Xin, Shun Gao, Hua Ma, Shaohua Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment Tianjin University of Science and Technology Tianjin300222 China Tianjin International Joint Research and Development Center of Low-Carbon Green Process Equipment Tianjin300222 China College of Mechanical Engineering Tianjin University of Science and Technology Tianjin300222 China Offshore Oil Engineering Co. Ltd Tianjin300450 China Beijing Institute of Aerospace Testing Technology Beijing100074 China

BiOCl/BiOBr/g-C3N4 ternary heterojunctions were prepared via one-pot method and their photocatalytic sterilization performances for Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) under visible light illumination were investigated. The highest activity was obtained over BiOCl/BiOBr/g-C3N4 ternary composite with n(Bi): n(g-C3N4) of 1:1, which approximately inactivated 100% of E. coli in 2h and 87.67% of S. aureus in 3h. Contrast to pure g-C3N4 and BiOCl/BiOBr binary heterojunction, the enhanced photocatalytic sterilization performance of the ternary heterojunction could be mainly attributed to its narrower band gap and more effective charge carriers separation. Last, the sterilization mechanism of the ternary heterojunction was discussed in detail. © 2025, The Authors. All rights reserved.

关键词： Escherichia coli

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High cycling stability, hydrogen-bonds strengthening Mg(NO3)2·6H2O-propionamide composite phase change materials as energy storage material for solar thermal system

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Journal of Energy Storage 2025年 125卷

作者： Liu, Cheng Zhang, Yi Zhang, Pengrui Ding, Yigang Sun, Jinhe Key Laboratory of Green Chemical Process of Ministry of Education Hubei Key Laboratory for Novel Reactor and Green Chemical Technology Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education School of Chemical Engineering and Pharmacy Wuhan Institute of Technology Wuhan430073 China Key Laboratory of Green and High-end Utilization of Salt Lake Resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining810008 China Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources Xining810008 China Qinghai Chemical Design and Research Institute Co. Ltd Xining810008 China

A multitude of composite phase change materials (PCM) systems have been developed, resulting in significant advancements in the efficiency of solar thermal storage systems. However, there is a paucity of inorganic-organic composite PCMs systems, and the phase change mechanism remains unclear, which significantly constrains the deployment and advancement of this category of PCMs. To address this gap in the literature, this team has developed a novel organic-inorganic composite PCM system using 30 wt% Mg(NO3)2·6H2O (MNH) and 70 wt% propanamide (POA) as raw materials. The thermal physical properties of the PCMs were initially analyzed, and the results demonstrated that the PCMs exhibited favourable latent heat and thermal cycling stability. The melting point was found to be 376.2 K, with a latent heat of melting of 131.93 J·g−1. It was observed that the melting temperature and latent heat remained essentially unaltered after 500 cycles. Subsequently, the structure of the PCMs was analyzed using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). Ultimately, the interaction between liquid MNH and POA was modeled using molecular dynamics, allowing for a deeper understanding of the phase transition mechanism. It is hypothesized that the hydrogen bonds (HBs) between the two substances affects the physical bond, and that HBs contribute to the PCMs having good stability and a high thermal decomposition temperature. The rational mechanism of this phenomenon is explained from many aspects, including structure, Hirshfeld surface and thermal analysis. It is anticipated that the discovery of this new PCMs will facilitate large-scale applications in solar energy storage. © 2025 Elsevier Ltd

关键词： Fourier transform infrared spectroscopy

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Freshwater-Derived Streptomyces: Prospective Polyvinyl Chloride (PVC) Biodegraders

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Scientific World Journal 2022年第1期2022卷

作者： Rodríguez-Fonseca, Maria Fernanda Ruiz-Balaguera, Sonia Valero, Manuel Fernando Sánchez-Suárez, Jeysson Coy-Barrera, Ericsson Díaz, Luis Eduardo Process Design and Management School of Engineering Universidad de la Sabana Chía 250001 Colombia Bioprospecting Research Group School of Engineering Universidad de la Sabana Chía 250001 Colombia Conservation Bioprospecting and Sustainable Development Group Environmental Engineering Program Universidad Nacional Abierta y A Distancia (UNAD) Bogotá 110911 Colombia Energy Materials and Environment Group School of Engineering Universidad de la Sabana Chía 250001 Colombia Environmental Engineering Program School of Exact Sciences and Engineering Universidad Sergio Arboleda Bogotá 111071 Colombia Bioorganic Chemistry Laboratory Universidad Militar Nueva Granada Cajicá 250247 Colombia

Polyvinyl chloride (PVC) is widely used in industrial applications, such as construction and clothing, owing to its chemical, physical, and environmental resistance. Owing to the previous characteristics, PVC is the third most consumed plastic worldwide and, consequently, an increasing waste accumulation-related problem. The current study evaluated an in-house collection of 61 Actinobacteria strains for PVC resin biodegradation. Weight loss percentage was measured after the completion of incubation. Thermo-gravimetric analysis was subsequently performed using the PVC incubated with the three strains exhibiting the highest weight loss. GC-MS and ionic exchange chromatography analyses were also performed using the culture media supernatant of these three strains. After incubation, 14 strains had a PVC weight loss percentage higher than 50% in ISP-2 broth. These 14 strains were identified as Streptomyces strains. Strains 208, 250, and 290 showed the highest weight loss percentages (57.6-61.5% range). The thermal stability of PVC after bacterial exposure using these three strains was evaluated, and a modification of the representative degradation stages of nonincubated PVC was observed. Additionally, GC-MS analysis revealed the presence of aromatic compounds in the inoculated culture media, and ionic exchange chromatography showed chloride release in the supernatant. A mathematical relation between culture conditions and PVC weight loss was also found for strains 208 and 290, showing an accuracy up to 97.99%. These results highlight the potential of the freshwater-derived Streptomyces strains as candidates for the PVC biodegradation strategy and constitute the first approach to a waste management control scale-up process. © 2022 Maria Fernanda Rodríguez-Fonseca et al.

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