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Progressive graphene derivatives scaffold based for tissue engineering application: A review

AIP Conference Proceedings 2021年第1期2344卷

作者： Muhammad Artha Jabatsudewa Maras Siti Fauziyah Rahman Gilar Wisnu Hardi Biomedical Engineering Program Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok Depok West Java 16424 Indonesia

Tissue engineering is able to produce, reconstruct, restore tissue, and organ through the scaffold. Tissue engineering formations are scaffold, cells, and growth factors. Graphene derivatives have opportunities to become materials promote endurance cells growth for tissue engineering forming a scaffold with specific characteristic in proper mechanical properties, physicochemical ability, enhance adhesion, proliferation, differentiation, and signaling to cells. Graphene and its derivatives are divided into three common types are pristine graphene as pure graphene, graphene oxide, and reduced graphene. Graphene derivatives have been used for various applications in tissue engineering, particularly for the use of induced osteogenesis, chondrogenesis, and drug delivery systems. Drug delivery is a new method to a vehicle the drugs through the site and control the drug loads inside using a scaffold. This review will demonstrate the progressive developments of the graphene derivatives scaffold-based in tissue engineering. In Preferential, we critically discuss and analyze the application of graphene derivatives in bone, cartilage tissue engineering, drug delivery system, and graphene biocompatibility. We hope the summary of this review will inspire others to studies on graphene derivatives in tissue engineering application so that it can be implemented in the next future clinical treatment.

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Coconut waste to green nanomaterial: Large scale synthesis of N-doped graphene nano sheets

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Nano-Structures and Nano-Objects 2023年 36卷

作者： Siburian, Rikson Tang, Liang Wei Alias, Yatimah Tok, Alfred Iing Yoong Goei, Ronn Simanjuntak, Crystina Tarigan, Kerista Paiman, Suriati Goh, Boon Tong Anshori, Isa Kurniawan, Cepi Postgraduate Program Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Sumatera Utara Medan 20155 Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Sumatera Utara Medan 20155 Indonesia Carbon and Frankincense Research Center Universitas Sumatera Utara Medan 20155 Indonesia Department of Chemistry Faculty of Science Universiti Malaya Kuala Lumpur 50603 Malaysia University Malaya Centre for Ionic Liquids (UMCiL) Universiti Malaya Kuala Lumpur 50603 Malaysia School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore Department of Physics Faculty of Mathematics and Natural Sciences Universitas Sumatera Utara Medan 20155 Indonesia Physics Department Faculty of Science Universiti Putra Malaysia Selangor (Serdang) Seri Kembangan 43400 Malaysia Low Dimensional Materials Research Centre Department of Physics Faculty of Science University of Malaya Kuala Lumpur 50603 Malaysia Biomedical Engineering Department School of Electrical Engineering and Informatics Bandung Institute of Technology Bandung 40132 Indonesia Research Center of Nanoscience and Nanotechnology Bandung Institute of Technology Bandung 40132 Indonesia Chemistry Department Faculty of Mathematics and Natural Sciences Universitas Negeri Semarang Semarang 50229 Indonesia Functional Material Research Center Universitas Negeri Semarang Semarang 50229 Indonesia

In this paper, a breakthrough was achieved in large-scale production of N-doped Graphene Nano Sheets (N-GNS) using coconut fruits. The main objectives were to produce N-GNS on a large scale and assess its electrical conductivity. The process involved two key steps: first, producing GNS from coconut fruits through pyrolysis, and then generating N-GNS by doping with nitrogen using ammonia solution at room temperature. Various analytical techniques were used to characterize the produced N-GNS, including X-ray Diffraction (XRD), Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM-EDS), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), Raman spectroscopy, and electrochemical cyclic voltammetry and electrochemical impedance spectroscopy. The XRD data indicated that the C (002) peak of N-GNS shifted to a higher 2θ value (2θ = 24.72°) compared to GNS (2θ = 23.86°), suggesting an incorporation of nitrogen into carbon structure in N-GNS. This was further supported by XPS data, which identified N-pyridine (BE = 402.0 eV) and C-N (BE = 286.8 eV) in N-GNS. TEM images showed that N-GNS had a flat surface, and the distance between graphene layers slightly expanded (0.36 nm) compared to graphene layers (0.34 nm). SEM images and EDX data validated the morphology, resembling honeycomb lattices, with a significant content of N atoms. Raman data successfully identified the D-band and G-band in N-GNS, further validating its production. Most importantly, N-GNS exhibited electrical conductivity, making it a promising candidate for conductive and supporting materials in various applications. The significance of this research extends beyond N-GNS production, opening up new avenues for the sustainable synthesis of valuable nanomaterials from coconut fruit waste, contributing to both graphene technology and environmental conservation. © 2023 Elsevier B.V.

关键词： C-sp2 electrical conductivity Graphene nano sheets N-graphene nano sheets N-pyridine XPS

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Rayleigh scattering-based distributed sensing in multicore optical fibers for shape reconstruction in multiplanar disturbance

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Measurement 2025年 256卷

作者： Leandro Macedo Anselmo Frizera Jan Nedoma Radek Martinek Carlos Marques Arnaldo Leal-junior Postgraduate Program in Electrical Engineering of the Federal University of Espírito Santo Av. Fernando Ferrari 514 - Goiabeiras Vitória 29075-910 Espírito Santo Brazil Department of Telecommunications Faculty of Electrical Engineering and Computer Science VSB—Technical University of Ostrava 17. listopadu 15 70833 Ostrava Czech Republic Department of Cybernetics and Biomedical Engineering VSB—Technical University of Ostrava 17. listopadu 15 70833 Ostrava Czech Republic CICECO University of Aveiro Campus Universitário de Santiago 3810-193 Aveiro Portugal

In recent years, advancements in smart cities and multifunctional monitoring have driven new demands for shape reconstruction devices. Multicore fibers (MCFs) are increasingly used due to their parallel data transmission capabilities and multiparameter sensing potential. This paper presents a Rayleigh-scattering-based distributed sensing approach with MCFs for shape reconstruction under multiplanar disturbances. Optical Frequency-Domain Reflectometry (OFDR) is utilized to analyze four cores in a seven-core fiber, enabling shape reconstruction through cross-correlation of spectral responses relative to an unstrained reference. Two configurations are compared: Configuration 1, a spatially separated core arrangement enabling independent strain independent strain measurements to be analyzed with a Frenet-Serret frame modeling and Random Forest (RF) algorithms, achieving a high accuracy with a maximum error of 8.72 × 10 −3 cm; and Configuration 2, a simplified approach analyzing all cores in the same OFDR channel, yielding a higher error of 0.27 cm when a RF algorithm was fed with features derived from the Rayleigh backscattered signal (loss amplitude, strain, spectral shift, and s- and p-polarization) measured by an optical backscatter reflectometer. Three protocols—pure bending, pure torsion, and combined bending/torsion—validate these configurations. The results emphasize this multifunctional MCF-based sensor system’s potential for flexible, integrated shape reconstruction solutions.

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Building data centers using Network Attached Storage (NAS) and Microprocessor Operating Systems

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IOP Conference Series: Materials Science and engineering 2021年第1期1088卷

作者： Titi Andriani Muhammad Hidayatullah Dekky Saputra Shinta Esabella G Gunawan Electrical Engineering Department Faculty of Engineering Universitas Teknologi Sumbawa Informatics Department Faculty of Engineering Universitas Teknologi Sumbawa Physics Education Study Program Faculty of Teacher Training and Education Universitas Mataram

Computer Laboratory of the University of Technology Sumbawa still does not have a Data Center, in the process of learning and teaching experiencing several obstacles one of which is the difficulty in sharing files between computers. The research objective is to build a Data Center at the Computer Laboratory of the University of Technology Sumbawa with the aim of facilitating practicum participants in sharing files between computer system devices. The method used in this research is the network development method Prepare, Plan, design, Implement, Operate, Optimize (PPDIOO). The results of NAS tests on different devices give results that are file access connections via wireless and LAN can run well and by producing Data Centers at the Computer Laboratory of the University of Technology Sumbawa can facilitate the process of storing cheap and efficient data.

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Optical Thouless pumping transport and nonlinear switching in a topological low-dimensional discrete nematic liquid crystal array

arXiv

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arXiv 2022年

作者： Jung, Pawel S. Parto, Midya Pyrialakos, Georgios G. Nasari, Hadiseh Rutkowska, Katarzyna Trippenbach, Marek Khajavikhan, Mercedeh Krolikowski, Wieslaw Christodoulides, Demetrios N. CREOL The College of Optics and Photonics University of Central Florida OrlandoFL32816 United States Faculty of Physics Warsaw University of Technology Warsaw Poland Ming Hsieh Department of Electrical and Computer Engineering University of Southern California Los AngelesCA90089 United States Faculty of Physics University of Warsaw Warsaw Poland Department of Physics & Astronomy Dornsife College of Letters Arts & Sciences University of Southern California Los AngelesCA90089 United States Laser Physics Centre Research School of Physics and Engineering Australian National University CanberraACT0200 Australia Science Program Texas A&M University at Qatar Doha Qatar

We theoretically investigate a Thouless pumping scheme in the 1D topological Su-Schrieffer-Heeger (SSH) model for single and multiple band-gaps systems when implemented in a discrete nematic liquid crystal arrangement. For an electrically controlled SSH waveguide array, we numerically demonstrate edge-to-edge light transport at low power levels. On the other hand, at higher powers, the transport is frustrated by light-induced nonlinear defect states, giving rise to robust all-optical switching. © 2022, CC BY.

关键词： Nematic liquid crystals

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Discussion on the Reliability of Inverters Operating in Hostile Environments

Discussion on the Reliability of Inverters Operating in Host...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Caio Eduardo Silva Hélder de Paula Francisco de Assis Dias Luciano Coutinho Gomes Graduate Program in Electrical Eng. Federal University of Uberlândia (UFU) Uberlândia Brazil Electrical Engineering Faculty (FEELT) Federal University of Uberlândia (UFU) Uberlândia Brazil

ISBN: (数字)9781728171920

ISBN: (纸本)9781728171937

Specially in the mining, steelmaking and oil industries, Pulse Width Modulation Voltage Source Inverters (PWM-VSI) driving induction motors located far away are often present. In this case, due to the long cable used for the converter-to-motor connection, several unwanted high-frequency phenomena are generated. In this context, a new configuration for drive systems was proposed, in which the rectifier is kept in its original position and the inverter bridge is installed near the driven motor, whose environment is always more hostile and can compromise its lifetime. In spite of the various technical-economic advantages from this new configuration, new concerns regarding the system reliability arise. In this way, the aim of the present study is to discuss, in a qualitative way, the main stressors present in typical motor drive applications, the dominant failure mechanisms of the critical components and the potential problems resulting from the inverter installation in harsh environments, along with the possible solutions to reduce them.

关键词： Induction motors Windings Inverters Topology Complexity theory Reliability Stress

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Supervised Machine-Learning Algorithms in Real-time Prediction of Hypotensive Events*

Supervised Machine-Learning Algorithms in Real-time Predicti...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Mina Chookhachizadeh Moghadam Ehsan Masoumi Nader Bagherzadeh Davinder Ramsingh Zeev N. Kain PhD Candidate of Computer Engineering University of California Irvine CA USA Research Collaborator with the Department of Electrical Engineering and computer science University of California Irvine CA USA Faculty of Electrical Engineering and Computer Science University of California Irvine CA USA Faculty of School of Medicine Loma Linda University Medical Center Loma Linda CA USA Chancellor’s Professor and Executive Director University of California Irvine CA USA

ISBN: (数字)9781728119908

ISBN: (纸本)9781728119915

Hypotension is common in critically ill patients. Early prediction of hypotensive events in the Intensive Care Units (ICUs) allows clinicians to pre-emptively treat the patient and avoid possible organ damage. In this study, we investigate the performance of various supervised machine-learning classification algorithms along with a real-time labeling technique to predict acute hypotensive events in the ICU. It is shown that logistic regression and SVM yield a better combination of specificity, sensitivity and positive predictive value (PPV). Logistic regression is able to predict 85% of events within 30 minutes of their onset with 81% PPV and 96% specificity, while SVM results in 96% specificity, 83% sensitivity and 82% PPV. To further reduce the false alarm rate, we propose a high-level decision-making algorithm that filters isolated false positives identified by the machine-learning algorithms. By implementing this technique, 24% of the false alarms are filtered. This saves 21 hours of medical staff time through 2,560 hours of monitoring and significantly reduces the disturbance caused by alarming monitors.

关键词： Prediction algorithms Sensitivity Support vector machines Decision making Labeling Logistics Monitoring

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Monitoring System for Organic Fertilizer Plant Controller Using Solar Energy

Monitoring System for Organic Fertilizer Plant Controller Us...

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International Conference on Science and Innovated engineering 2018, i-COSINE 2018

作者： Mardiyanto, Arief Syamsul Azhar Electronics Study Program Faculty of Electrical Engineering Politeknik Negeri Lhokseumawe Jln. B.Aceh Medan Km.280 Buketrata24301 Indonesia

In this applied research, a solar energy powered process control monitoring system of inorganic fertilizer plant with capacity of 300 liters has been developed. The process control system consists of PLC with solar energy panel as its power source and a monitoring process system. The monitoring process system includes a Raspberry Pi minicomputer, an LCD touchscreen, level shifter converters, Arduino Nano, RS485 modules, four analog sensors, and one digital sensor. This system works by collecting temperature, humidity, and gas concentrations data and controlling the heater, exhaust fan, and aerator to maintain desired processing ***-22 digital sensor measures temperature and humidity, pH probe analog sensor measures pH values, MQ-4, MQ-7 and MiCS-2714 measures methane, carbon monoxide, and nitrogen dioxide gases respectively. Analog output sensor is read by PLC's analog to digital converter while digital output sensor is read by 1-wire bus by Arduino. The collected data is send over RS485 to Raspberry Pi. The plant temperature is set constant at 40°C. The heater is turned on at temperature of ≤ 38°C, when temperature reach ≤ 42°C the aerator, exhaust fan, and mixer will be on and will be switched off all together at 40°C. The temperature, humidity and PH are set as the reference of the control process. © Published under licence by IOP Publishing Ltd.

关键词： Solar energy

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Induction voltages square and triangle solenoid as alternatives electrical energy resources

Induction voltages square and triangle solenoid as alternati...

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2018 International Conference on Research and Learning of Physics, ICRLP 2018

作者： Pathoni, H. Pratiwi, D. Education Physics Study Program Education and Teacher Training Faculty Jambi University Jl. Jambi Muara-Bulian Km15 Mendalo Darat Jambi36361 Indonesia Electrical Engineering Study Program Engineering Faculty Jambi University Jl.Tri Brata Pondok Meja Muara Jambi Jambi Indonesia

Solenoids have been made with square and triangular cross-sections. Both kinds of solenoids are made with an iron core and without an iron core. The solenoids specification were 12 cm long and 3.5 cm wide with 220 windings and 900 windings. The iron core specification was 12.5 cm long and 8 mm diameter. The induction voltages both of solenoids have calculated with experiments method in the laboratory. Calculation of induction voltages with the experiment method used the motor as the magnetic drive, full-wave rectifier circuit, neodym magnet, and led lamp. Induction voltage and electric current obtained of each solenoid for range from two cm until ten cm. The closest distance between the solenoid with the motor as magnetic drive and the greater the number of solenoid windings produced the greater the induction voltages. Triangular-sided solenoids with 220 windings produced faster induction voltages than the square-sided solenoid for the same number of windings. While an iron core solenoids produced faster induction voltages than solenoid without an iron core. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Solenoids

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Initial Results of a Prototype AWSM-PET Device for Augmented Whole-body PET Imaging

Initial Results of a Prototype AWSM-PET Device for Augmented...

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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： Y. Chen M. Hambdi S. Komarov R. A. Mintzer S. Cho D. Pocci A. Thomas J. Corbeil J. Breuer M. Judenhofer N. Wu J. Frye F. Dehdashti J. A. O’Sullivan R. Laforest S. B. Siegel Y.-C. Tai Imaging Science PhD Program Washington University in St.Louis St. Louis Missouri United States of America Mallinckrodt Institute of Radiology Washington University in St. Louis St. Louis Missouri United States of America Molecular Imaging Siemens Medical Solutions USA Inc Knoxville Tennessee United States of America Department of Chemistry Washington University in St. Louis St. Louis Missouri United States of America Department of Biostatistics Washington University in St. Louis St. Louis United States of America Department of Electrical and Systems Engineering Washington University in St. Louis Missouri St. Louis United States of America

The Augmented Whole-body Scanning via Magnifying PET (AWSM-PET) is a technology designed to enhance the diagnostic accuracy of whole-body (WB) PET/CT imaging for the detection of small lesions. We recently constructed the first prototype AWSM-PET device that consists of two panels of high-resolution time-of-flight (TOF) PET detectors (using ~1mm pitched LSO crystals), integrated with the standard readout electronics and event processing architecture of the Siemens Biograph Vision scanner. The system exhibits excellent spatial, energy and timing resolution, with an average coincidence resolving time of ~183 ps FWHM and an average energy resolution of ~11% FWHM at 511 keV. Custom firmware and software have been developed to encode the large number of detector elements and to enable coincidence detection between the AWSM-PET detectors and the Biograph Vision *** tests of the AWSM-PET device show the image resolution of the Biograph Vision scanner is improved from the original >3mm to ~2mm FWHM. A GPU-based list-mode image reconstruction framework has been expanded to incorporate the point-spread function (PSF) of the native scanner and the AWSM-PET detectors to optimize the spatial resolution and improve image *** step-and-shoot and continuous-bed motion imaging protocols are supported for the AWSM-PET operation and are being evaluated for the reconstructed image resolution and the uniformity of the overall system sensitivity across a long axial FOV. Extensive phantom imaging studies are ongoing to evaluate the system's performance. Initial human imaging studies will be presented in the upcoming 2023 Medical Imaging Conference.

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