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Enhanced Dye Adsorption and Bacterial Removal of Magnetic Nanoparticle-Functionalized Bacterial Cellulose Acetate Membranes

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Journal of Renewable Materials 2024年第9期12卷 1605-1624页

作者： Heru Suryanto Daimon Syukri Fredy Kurniawan Uun Yanuhar Joseph Selvi Binoj Sahrul Efendi Fajar Nusantara Jibril Maulana Nico Rahman Caesar Komarudin Komarudin Centre of Advanced Material for Renewable Energy(CAMRY) Universitas Negeri MalangMalang65145Indonesia Department of Mechanical and Industrial Engineering Universitas Negeri MalangMalang65145Indonesia Department of Food and Agricultural Product Technology Faculty of Agricultural TechnologyAndalas UniversityPadang25163Indonesia Department of Chemistry Institut Teknologi Sepuluh NopemberSurabaya60111Indonesia Study Program of Aquatic Resources Management Faculty of Fisheries and Marine ScienceBrawijaya UniversityMalang65145Indonesia Institute of Mechanical Engineering Saveetha School of EngineeringSaveetha Institute of Medical and Technical Sciences(SIMATS)Saveetha UniversityChennai602105India Faculty of Vocational Universitas Negeri MalangMalang65145Indonesia

Utilizing biomass waste as a potential resource for cellulose production holds promise in mitigating environmental *** current study aims to utilize pineapple biowaste extract in producing bacterial cellulose acetate-based membranes with magnetic nanoparticles(Fe_(3)O_(4)nanoparticles)through the fermentation and esterification process and explore its *** bacterial cellulose fibrillation used a high-pressure homogenization procedure,and membranes were developed incorporating 0.25,0.50,0.75,and 1.0 wt.%of Fe3O4 nanoparticles as magnetic nanoparticle for *** membrane characteristics were measured in terms of Scanning Electron Microscope,X-ray diffraction,Fourier Transform Infrared,Vibrating Sample Magnetometer,antibacterial activity,bacterial adhesion and dye adsorption *** results indicated that the surface morphology of membrane changes where the bacterial cellulose acetate surface looks *** crystallinity index of membrane increased from 54.34%to 68.33%,and the functional groups analysis revealed that multiple peak shifts indicated alterations in membrane functional ***,adding Fe_(3)O_(4)-NPs into membrane exhibits paramagnetic behavior,increases tensile strength to 73%,enhances activity against *** and ***,and is successful in removing bacteria from wastewater of the river to 67.4%and increases adsorption for anionic dyes like Congo Red and Acid Orange.

关键词： Bacterial cellulose dye adsorption Fe_(3)O_(4)nanoparticles membrane pineapple waste

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Why-So-Deep: Towards Boosting Previously Trained Models for Visual Place Recognition

arXiv

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arXiv 2022年

作者： Bhutta, M. Usman Maqbool Sun, Yuxiang Lau, Darwin Liu, Ming C3 Robotics Lab Department of Mechanical and Automation CUHK Hong Kong Department of Mechanical Engineering PolyU Kowloon Hong Kong Department of Electronic and Computer Engineering HKUST Hong Kong

Deep learning-based image retrieval techniques for the loop closure detection demonstrate satisfactory performance. However, it is still challenging to achieve high-level performance based on previously trained models in different geographical regions. This paper addresses the problem of their deployment with simultaneous localization and mapping (SLAM) systems in the new environment. The general baseline approach uses additional information, such as GPS, sequential keyframes tracking, and re-training the whole environment to enhance the recall rate. We propose a novel approach for improving image retrieval based on previously trained models. We present an intelligent method, MAQBOOL, to amplify the power of pre-trained models for better image recall and its application to real-time multiagent SLAM systems. We achieve comparable image retrieval results at a low descriptor dimension (512-D), compared to the high descriptor dimension (4096-D) of state-of-the-art methods. We use spatial information to improve the recall rate in image retrieval on pre-trained models. Material related to this work is available at https://***/why-so-deep. © 2022, CC BY-NC-ND.

关键词： Image retrieval

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The graphene shielding effect against UV exposure: The bonded joint investigation

The graphene shielding effect against UV exposure: The bonde...

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28th Annual Technical Conference of the American Society for Composites 2013, ASC 2013

作者： DaCruz, D.T.L. Ávila, A.F. Universidade Federal de Minas Gerais Graduate Studies Program in Mechanical Engineering 6627 Antonio Carlos Avenue Belo Horizonte Minas Gerais 31270-901 Brazil Universidade Federal de Minas Gerais Department of Mechanical Engineering 6627 Antonio Carlos Avenue Belo Horizonte Minas Gerais 31270-901 Brazil

ISBN: (纸本)9781629931432

This paper reports the effect of graphene dispersion into epoxy adhesives and its aging by UVA light exposure. To achieve this goal, two approaches were employed. The first one was direct exposure of the nano-modified AR300/AH30-150 samples to UVA light for four hundred hours. After the aging process, nanoindentation tests were performed. The second approach was based on tensile tests of aged single lap joints (SLJ). The graphene nanostructures formed inside the AR300/AH30-150 nano-modified adhesive seems to block the aging process, as none of the specimens presented a decrease on stiffness. The force-displacement curves obtained by nanoindentation seem to indicate a good dispersion process, as the large majority of the curves laid down at the same path. When the single lap joints were tested the results also indicated an average increase on bearing-load capacity of 40.96% and 72.03% for 1 wt. % and 2 wt. %, respectively for one hundred hours aging. When the aging reached two hundred hours, there is a decrease on load capacity when compared against the 100 hours results. Even though, the average load capacity was 27.03% and 58.19% higher than the not aged AR300/AH30-150 single lap joints. At 400 hours there is another increase on load capacity, i.e. 32.06% and 74.43% for 1 wt. % and 2 wt. % graphene, respectively. A finite element simulation revealed that peel and shear stresses at adhesive edge increased by 82%. The Fourier Transformed Infrared tests revealed that chemical changes on hydroxyl, carbonyl and epoxy components could be the reason for this behavior. The graphene dispersion into the epoxy adhesives seems to have a double folded effect, in one hand it is increase the bonded joint capacity and on the other hand block the aging effect of UVA light.

关键词： Graphene

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Intelligent BioRobot platform for integrated clinical test

Intelligent BioRobot platform for integrated clinical test

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2006 SICE-ICASE International Joint Conference

作者： Byung, June Choi Kyuho, Noh Jung, Woo Kim Sung, Moon Jin Ja, Choon Koo Sung, Moo Ryew Jinhyun, Kim Woong, Hee Son Ahn, Ki Tak Wankyun, Chung Hyouk, Ryeol Choi School of Mechanical Engineering Sungkyunkwan University Suwon Korea Republic of Division of System Development KnR System Inc. Youngin Korea Republic of Division of Applied Robot Technology Korea Institute of Industrial Technology Cheonan Korea Republic of Pohang Institute of Intelligent Robotics Pohang Korea Republic of Department of Mechanical Engineering Pohang University of Science and Technology Pohang Korea Republic of

ISBN: (纸本)8995003855

Recently, automation in clinical test is raised as a fusion of bio and robotic technology. Particularly, automation in clinical test becomes a new application area of the robotic technology. In this paper, we present a robot platform for clinical test suitable for small or medium size of hospitals. The platform is designed to minimize the consumption of reagents, and easily integrate various testing equipments since it is functionally modularized. The platform is aimed for accommodating almost 70 kinds of clinical tests, which are the most frequently conducted in the hospitals. The platform consists of several major function blocks such as manipulation, transportation and detection, incubation, reservation, and each of them is designed as a module of the system. Basic ideas of the design are described and each functional block is explained in details. © 2006 ICASE.

关键词： Intelligent robots

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Direct measurements of fluid slip using laser induced fluorescence photobleaching anemometer (LIFPA)

Direct measurements of fluid slip using laser induced fluore...

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2016年大连国际微纳流体和微流控芯片大会(2016 International Conference of Microfluidics, Nanofluidics and Lab-On-A-Chip

作者： Feng Shen Bin Zhou Guiren Wang Department of Mechanical Engineering & Biomedical Engineering Program University of South Carolina Columbia SC 29208 USA Department of Mechanical Engineering & Biomedical Engineering Program University of South Carolina Columbia SC 29208 USA College of Civil Engineering and Architecture Weifang University Weifang 261061 China Department of Mechanical Engineering & Biomedical Engineering Program University of South Carolina Columbia SC 29208 USA College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology Beijing 100124 China

Fluid slip has been reported by a large number of studies using different techniques[1].However, the obtained slip lengths for Newtonian liquids vary from a few nanometers to about 1 μm, and there is little agreement...

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Proximal femoral density patterns are consistent with bicentric joint loads

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Computer Methods in Biomechanics and Biomedical engineering 1999年第4期2卷 271-283页

作者： Fischer, Kenneth J. Jacobs, Christopher R. Levenston, Marc E. Cody, Dianna D. Carters, Dennis R. Musculoskeletal Research Center Department of Orthopaedic Surgery University of Pittsburgh Pittsburgh PA 15213 United States Department of Orthopaedics Musculoskeletal Research Laboratory Pennsylvania State University School of Medicine Hershey PA 17033 United States Department of Electrical Engineering and Computer Science Continuum Elect romechanics Mhoratory Massachusetts Institute of Technology Hershey MA 02139 United States Department of Diagnostic Radiology Division of Radiologic Physics and Engineering Henry Ford Hospital Detroit MI 48202 United States Department of Veterans Affairs Medical Center Rehabilitation Research and Development Center Palo Alto CA 94304-1200 United States Department of Mechanical Engineering Stanford University Biomechanical Engineering Program Stanford CA 94305-402 United States

We developed an alternate method for density-based load estimation and applied it to estimate hip joint load distributions for two femora. Two-dimensional finite element models were constructed from single energy quantitative computed tomography (QCT) data. Load estimation was performed using five loading regions on the femoral head. Within each loading region, individual nodal loads, normal to the local surface, were supplied as input to the load estimation. An optimization procedure independently adjusted individual nodal load magnitudes in each region, and the magnitudes of muscle forces on the greater trochanter, such that the applied tissue stimulus approached the reference stimulus throughout the model. Dominant estimated load resultant directions were generally consistent with published experimental data for loads during gait. The estimated loads also suggested that loads near the extremes of the articulating surface may be important (even required) for development and maintenance of normal bone architecture. Estimated load distributions within nearly all regions predicted bicentric loading patterns, which are consistent with observations of hip joint incongruity. Remodeling simulations with the estimated loads predicted density distributions with features qualitatively similar to the QCT data sets. This study illustrates how applications of density-based bone load estimation can improve understanding of dominant loading patterns in other bones and joints. The prediction of bicentric loading suggests a very fine level of local adaptation to details of joint loading. © 1999 OPA (Overseas Publishers Association) N.V.

关键词： Finite element method

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A Novel Additive Manufacturing Method for Spiral Parts

A Novel Additive Manufacturing Method for Spiral Parts

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IEEE International Conference on Cyber Technology in Automation, Control, and Intelligent Systems

作者： Xizhi Gu ZhiMin Hou Jing Xu Ken Chen Guanglie Zhang Department of Mechanical Engineering Tsinghua University Beijing China Shenzhen Academy of Robotics Shenzhen Guangdong China

Additive manufacturing (AM) is a promising manufacturing technology. Wire-arc AM (WAAM) has great potential in the metal AM process, and welding based WAAM has its unique advantage. Slicing is an essential work in AM. Currently, most slicing methods are layer-wise, without consideration of the workpiece's geometric and topological characteristics, causing problems such as stair-case effect, anisotropic property and waste of support material, resulting in inaccuracy of finishing part. This paper proposes a spiral slicing method, fully conforming to the part's geometric feature, theoretically eliminating the staircase effect, and obtaining better mechanical property. The slicing direction is along the centroid axis, generating non-uniform thickness layers. The non-uniform layers are realized by adjustment of welding parameters. The whole system is implemented in the RobotStudio®in accordance with characteristics of the welding based WAAM.

关键词： Welding Spirals Solid modeling Surface treatment Robot kinematics Three-dimensional printing

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Dual-axis Cellular Force Microscope for mechanical characterization of living plant cells

Dual-axis Cellular Force Microscope for mechanical character...

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2016 IEEE International Conference on Automation Science and engineering, CASE 2016

作者： Burri, Jan T. Hu, Chengzhi Shamsudhin, Naveen Wang, Xiaopu Vogler, Hannes Grossniklaus, Ueli Nelson, Bradley J. Multi-Scale Robotics Lab Department of Mechanical and Process Engineering ETH Zürich Zürich8092 Switzerland Department of Plant and Microbial Biology Zürich-Basel Plant Science Center University of Zürich Zürich8008 Switzerland

ISBN: (纸本)9781509024094

Understanding the mechanisms of plant growth and morphogenesis is of importance, not only to the field of plant sciences but also in a broader agricultural and economical context, as plants provide important raw materials such as food, fiber, wood and fuel. Mathematical modeling and simulation can provide insights into intricate biomechanical growth mechanisms. mechanical characterization at single cellular level is essential for providing quantitative model parameters. The dual-axis Cellular Force Microscope (CFM) provide many of these desired parameters by micro-indentation measurements. The dual-axis CFM integrates a MEMS force sensing technology with a piezoelectric nano-positioning system. The dual force feedback from the MEMS sensor allows the system to be used for arbitrary indentation angles and to accurately measure biological samples despite their curved surfaces. The accuracy of the dual-axis CFM is verified by measuring a force-standard with a certified stiffness of 15.15 N/m at indentation angles of 90° and 60°. The obtained stiffness measurements are 15.60 N/m and 14.63 N/m and differ from the calibrated value by 2.97% and 3.63%, respectively. Additionally, the dual-axis CFM offers topographic imaging which was used to visualize two hemispherical structures fabricated using two-photon photopolymerization with radii of 5 μm and 7.5 μm. The potential of the system to study plant cell mechanics at a single cell level is shown by indenting a Lilium longiflorum pollen tube along its axis at the tip. The topographical information combined with the recorded force feedback in axial and lateral directions show promising results for further mechanical characterization of plant cells using the dual-axis CFM. © 2016 IEEE.

关键词： Stiffness

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Assessment of shortfall: A board game on environmental decisionmaking

Assessment of shortfall: A board game on environmental decis...

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113th Annual ASEE Conference and Exposition, 2006

作者： Qualters, Donna Isaacs, Jacqueline Cullinane, Thomas McDonald, Ann Laird, Jay Northeastern University United States School of Education Center for Effective University Teaching Northeastern University Boston MA United States Department of Mechanical and Industrial Engineering Northeastern University Boston MA United States Engineering Management Program Graphic Design and Multimedia Studies Department of Metaversal Studios

Significant disparities in the learning styles of millennial students (students born after 1980) and those of their instructors have been documented. Shortfall is a board game designed to raise awareness of the concept of environmental decisionmaking in the supply chain. The project explores the hypothesis that millennial engineering students approach learning in a communal, active manner using trial and error approaches. Results of this pilot exploratory project suggest that engineering students are able to learn new information in a collaborative game approach, which impacts their confidence and self-awareness of their knowledge base. © American Society for engineering Education, 2006.

关键词： Environmental engineering

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Optimal linear control driven for piezoelectric non-linear energy harvesting on non-ideal excitation sourced

Optimal linear control driven for piezoelectric non-linear e...

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2014 International Conference on Mechatronics and Intelligent Materials, MIM 2014

作者： Da Costa Ferreira, Douglas Chavarette, Fábio Roberto Peruzzi, Nelson José UNESP - Univ. Estadual Paulista Mechanical Engineering PhD Program Ilha Solteira SP Brazil UNESP - Univ. Estadual Paulista Mathematics Department Ilha Solteira SP Brazil

ISBN: (纸本)9783038351412

Non-linear energy harvesting system was project to enhance interaction to ambient vibration that is wide band and low power which difficult the design for resonant solution. To improve efficiency of a non-linear design it was project a control system based in optimal linear control (OLC). Applying numerical evaluations it was possible to analyze the kinetic energy from the system as also the resulting output voltage. As main result there was a considerable increase of output voltage due controlled system in comparison to open loop for the same excitation. © (2013) Trans Tech Publications, Switzerland.

关键词： Energy harvesting

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