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Novel synthesis of ZIF67 derived cobalt and nickel oxides induced by ammonium tetrafluoroborate as electroactive material of battery supercapacitor hybrids

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Journal of Energy Storage 2023年 68卷

作者： Kuo, Tsung-Rong Draviana, Hanny Tika Hsu, Chia-Shuo Chung, Ren-Jei Chen, Min-Wen Wang, Su-Ching Lee, Pin-Yan Yougbaré, Sibidou Lin, Lu-Yin Wu, Yung-Fu International PhD Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan Graduate Institute of Nanomedicine and Medical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology Taipei106 Taiwan Department of Chemical Engineering and Biotechnology National Taipei University of Technology Taipei Taiwan BP 218 11 Nanoro Burkina Faso Department of Chemical Engineering Ming Chi University of Technology New Taipei City24301 Taiwan

Cobalt and nickel oxides with large theoretical capacitance, high redox activity and low-cost features are widely applied as electroactive material of battery supercapacitor hybrids (BSH) to reduce energy consumption and create renewable energy. Synthesizing cobalt and nickel oxides using zeolitic imidazolate framework 67 (ZIF67) can enhance conductivity and electroactivity and maintain surface area and porosity of ZIF67. Structure directing agent (SDA) can control morphology and improve electrochemical performance. It is attractive to apply SDA for controlling morphology of oxidized ZIF67 and achieving excellent energy storage. In this work, ammonium tetrafluoroborate (NH4BF4) is firstly applied as SDA to synthesize ZIF67 derivative, which is then annealed to form leaf-like cobalt and nickel oxides as electroactive material. The optimal oxidized ZIF67 derivative shows a larger specific capacitance (CF) of 828.9 F/g than those of 519.9 and 5.0 F/g respectively for the oxidized ZIF67 and pristine ZIF67 electrodes, due to preferable leaf-like structure and (311) facet for the former case. A BSH with oxidized ZIF67 derivative positive electrode and graphene negative electrode shows maximum energy density of 10.2 Wh/kg at 357 W/kg, and CF retention of 91% and Coulombic efficiency of 97% after 10,000 cycles. The novel SDA of NH4BF4 is expected to design other efficient electroactive materials for effective energy storage. © 2023 Elsevier Ltd

关键词： Nickel oxide

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Transcriptomic Investigation of Bioeffects from Microbubble and Focused Ultrasound Assisted Blood Brain Barrier Opening

Transcriptomic Investigation of Bioeffects from Microbubble ...

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2023 IEEE International Ultrasonics Symposium, IUS 2023

作者： Song, Jane J. Martinez, Payton J. Song, Kang-Ho Garay, Francis Mufford, Toni Green, Adam Serkova, Natalie Borden, Mark University of Colorado Boulder Biomedical Engineering Program Boulder United States University of Colorado Boulder Department of Mechanical Engineering Boulder United States University of Colorado Department of Radiology Anschutz Medical Campus Aurora United States University of Colorado Department of Pediatric Oncology Anschutz Medical Campus Aurora United States

ISBN: (纸本)9798350346459

Microbubbles stimulated by focused ultrasound is a rapidly emerging technique for noninvasively permeabilizing the blood brain barrier (BBB) for the delivery of therapeutic agents. Despite its prevalence, much is still unknown regarding the bioeffects of blood brain barrier opening (BBBO), such as the sterile inflammatory response (SIR). Testing a range of 4 microbubble volume doses (MVD) and 3 mechanical indices (MI), our study aims to investigate how these two parameters influence BBBO and the subsequent SIR RNA transcriptomic responses following permeabilization. Our results highlight that MVD and MI both influence the onset and degree of BBBO, with higher MVD and MI exhibiting the greatest degree of agent delivery compared to lower doses. Additionally, RNA sequencing analysis revealed that the most enriched gene sets are indeed associated with an inflammatory response. Through analysis of BBBO volume and RNA transcriptomics, a therapeutic window was established and indicated a region between BBBO and the onset of SIR where the BBB is permeabilized without significant inflammation. These results may help to standardize BBBO parameters to improve the safety and efficacy of drug delivery into the brain and confront gaps in knowledge regarding the biological mechanisms behind BBBO. © 2023 IEEE.

关键词： RNA

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Quantifying White Matter Hyperintensities: Predicting Periventricular Fazekas Scores with Uncertainty Estimation

Quantifying White Matter Hyperintensities: Predicting Perive...

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IEEE International Symposium on biomedical Imaging

作者： Susanne Schmid Amirmohammed Shamaei Roberto Souza Richard Frayne Biomedical Engineering Graduate Program University of Calgary Hotchkiss Brain Institute University of Calgary Seaman Family MR Research Centre Foothills Medical Centre Calgary AB Canada Electrical and Software Engineering University of Calgary Radiology University of Calgary Clinical Neurosciences University of Calgary

ISBN: (数字)9798331520526

ISBN: (纸本)9798331520533

White matter hyperintensities (WMH) are crucial markers in brain magnetic resonance (MR) images, often quantified using the Fazekas score. This study presents a deep learning model to predict Fazekas scores in the periventricular region from T1-weighted and FLAIR images. Our model achieved a Matthew correlation coefficient of 0.68 and F1 scores of 0.69, 0.88, 0.86, and 1.0 for Fazekas scores from 0 to 3, respectively, surpassing previous methods. We introduce a novel integration of t-distributed stochastic neighbor embedding (t-SNE) with uncertainty analysis using Monte Carlo dropout, offering insights into the model's decision-making. Results show effective class distinction, with increased uncertainty at class transitions indicating ambiguity, and confident misclassified cases suggesting overlapping features or label noise. These findings highlight that simple, well-tuned models, coupled with interpretability techniques, can provide robust predictions of WMH severity.

关键词： Deep learning Uncertainty Monte Carlo methods Noise Stochastic processes Magnetic resonance Estimation Predictive models Brain modeling White matter

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Differences in Cardiovascular Regulation to Head-up Tilt between Healthy and Hypertensive Subjects

Differences in Cardiovascular Regulation to Head-up Tilt bet...

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

作者： Jia Hui Ooi Choon Hian Goh Maw Pin Tan Reza Argha Hooi Chin Beh Nigel H. Lovell Einly Lim Graduate School of Biomedical Engineering UNSW Sydney New South Wales Australia Department of Biomedical Engineering Faculty of Engineering Universiti Malaya Kuala Lumpur Malaysia Department of Mechatronics and BioMedical Engineering Lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul Rahman Kajang Selangor Malaysia Department of Medicine Faculty of Medicine Universiti Malaya Kuala Lumpur Malaysia Graduate School of Biomedical Engineering and Tyree Foundation Institute of Health Engineering UNSW Sydney New South Wales Australia Department of Primary Care Medicine University Malaya Medical Centre Kuala Lumpur Malaysia

To date there have only been limited studies exploring abnormal hemodynamic responses to head-up tilt tests (HUTs) in elderly, treated patients with hypertension. Cardiovascular regulation in response to HUT as well as upright hemodynamics may be altered when older hypertensive patients with antihypertensive treatments are studied. Hypertensive patients with and without receiving antihypertensive medication and above the age of 45 were recruited in this study. This study compared the cardiovascular responses to HUT and at rest between healthy and hypertensives using non-invasive hemodynamic measurements. Parameters such as systolic blood pressure (SBP), diastolic blood pressure (DBP), heart rate (HR), stroke index (SI) and total peripheral resistance index (TPRI) were measured in 40 subjects (20 healthy and 20 hypertensives) for 10-min supine baseline, 10-min HUT at 70 ◦ and 6-min supine recovery. At rest and during HUT, SBP and TPRI were significantly higher in hypertensives together with a significantly smaller baseline SI. In response to HUT, both groups showed changes in hemodynamic parameters at differing degrees. During recovery, all parameters returned to the baseline range. Our findings indicated that hypertensive patients of older age being treated by antihypertensive drugs may have different cardiovascular changes in response to orthostatic *** Relevance— This pilot study describes how cardiovascular regulation in response to postural change may behave differently in hypertensive elder patients taking antihypertensive drugs.

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Design of Indoor Occupancy Estimation System with Wireless Brain-Inspired Computing Platform

Design of Indoor Occupancy Estimation System with Wireless B...

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Annual IEEE Systems Conference

作者： Ryuji Nagazawa Haruto Ota Kien Nguyen Hiroo Sekiya Won-Joo Hwang Hiroyuki Torikai Mikio Hasegawa Department of Informatics Graduate School of Informatics Chiba University Chiba Japan Department of Biomedical Convergence Engineering Pusan National University Yangsan-si Korea Graduate School of Science and Engineering Hosei University Tokyo Japan Department of Electrical Engineering Tokyo University of Science Tokyo Japan

ISBN: (数字)9798331508180

ISBN: (纸本)9798331508197

The estimation of indoor occupancy rates has become increasingly important, especially for accident prevention at events and providing critical rescue information during disasters. However, conventional systems require significant effort and cost for installation, such as the need for dedicated servers and internet connectivity, making them difficult to deploy conveniently. This study proposes the design of an indoor occupancy estimation system based on the Wireless Brain-Inspired Computing (WiBIC) platform. By equipping each IoT device with neuron functionality, environmental data is compressed into spike signals directly at the source. These signals are processed using intelligent information processing techniques based on the principles of brain-inspired computing, enabling the estimation of indoor occupancy. The WiBIC platform's serverless architecture and low-power characteristics allow for easy and efficient deployment of the system in various indoor environments. The proposed system further emphasizes energy efficiency by incorporating FPGA implementation and the Asynchronous Pulse Code Multiple Access (APCMA) protocol. Experimental evaluations were conducted using data collected from illuminance sensors, human detection sensor, and current sensors to estimate occupancy rates. The results show that the system achieves practical accuracy, validating its effectiveness. The accuracy achieved is sufficient for practical applications, demonstrating the effectiveness of the proposed system.

关键词： Wireless communication Performance evaluation Wireless sensor networks Accuracy Neurons Estimation Information processing Sensor phenomena and characterization Internet of Things Servers

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The Development of Wound Healing Patch Containing Silk Sericin and Cinnamon Extract for the Treatment of Infected Wound

The Development of Wound Healing Patch Containing Silk Seric...

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biomedical engineering International Conference (BMEiCON)

作者： Siriporn Piyapan Pornanong Aramwit Biomedical Engineering Program Faculty of Engineering Chulalongkorn University Bangkok Thailand Bioactive Resourse for Innovative Clinical Applications Research Unit Faculty of Pharmaceutical Sciences Chulalongkorn University Bangkok Thailand

ISBN: (数字)9798331505431

ISBN: (纸本)9798331505448

Sericin is a natural protein from silkworm cocoons. It is used in many biomedical applications as scaffolds, films, hydrogels, and micro/nanoparticles. This study was interested in fabricating a scaffold from sericin as a wound healing patch. The scaffold was fabricated, but sericin had poor properties, so it needed to be solved using another polymer. Poly(vinyl alcohol) (PV A) was chosen to improve their properties in conjunction with chemical (adding glutaraldehyde) and physical (freezing-thawing) crosslink. The cross-section of SEM showed high porous and good interconnectivity all around the sheet of both scaffolds. The chemical crosslink scaffold (CC scaffold) was smaller porous than the physical crosslink scaffold (PC scaffold). The result of FTIR showed that the specific absorption peaks of sericin were amide I at 1618–1640 cm -1 ( $C=O$ stretching), amide II at 1518–1638 cm -1 (N-H bending and C-N stretching) and amide III at 1238 cm -1 (C-N and $C=O$ stretching). Adding glutaraldehyde gave the two small peaks at 2830 -3000 cm -1 , indicating the C-H bond of the aldehyde and alkyl functional group. The mechanical testing, crosslinking can resist deformation observed from Young's modulus. Young's modulus of non-crosslink, physical and chemical crosslink scaffolds were $1.4\pm 0.001,34.4\pm 0.004$ and $7.5\pm 0.004\text{kPa}$ , respectively. Elongation at break of scaffolds were 116.4 $\pm$ 11.1 %, 140.3 $\pm$ 13.2% and 22.7 $\pm$ 17%, respectively. These results suggested that the addition of glutaraldehyde had an impact on the brittleness of the scaffold. The swelling property indicated the wound healing patch's efficiency in absorbing liquids or exudate. There were two folds of swelling of the CC scaffold compared with the PC scaffold at intervals time after immersion. At the same time, sericin released more than 450 $\mu \mathrm{g}/\text{mL}$ from both scaffolds after 48 $h$ . MTT assay showed that they were non-toxic at 2 4 and 4 8 $h$ . Cell viability has

关键词： Young's modulus Three-dimensional displays Deformation Escherichia coli Resists Wounds Antibacterial activity Chemicals Testing Strain

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Artificial optoelectronic synapse based on spatiotemporal irradiation to source-sharing circuitry of synaptic phototransistors

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InfoMat 2024年第2期6卷 131-141页

作者： Seungho Song Changsoon Choi Jongtae Ahn Je-Jun Lee Jisu Jang Byoung-Soo Yu Jung Pyo Hong Yong-Sang Ryu Yong-Hoon Kim Do Kyung Hwang Center for Opto-Electronic Materials and Devices Post-Silicon Semiconductor InstituteKorea Institute of Science and Technology(KIST)SeoulRepublic of Korea School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySuwonRepublic of Korea Center for Spintronics Post-Silicon Semiconductor InstituteKorea Institute of Science and Technology(KIST)SeoulRepublic of Korea Division of Nanoscience&Technology KIST SchoolUniversity of Science and Technology(UST)SeoulRepublic of Korea School of Biomedical Engineering Korea UniversitySeoulRepublic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoulRepublic of Korea

To overcome the intrinsic inefficiency of the von Neumann architecture,neuromorphic devices that perform analog vector–matrix multiplication have been highlighted for achieving power-and time-efficient data *** particular,artificial synapses,of which conductance should be programmed to represent the synaptic weights of the artificial neural network,have been intensively researched to realize neuromorphic ***,inspired by excitatory and inhibitory synapses,we develop an artificial optoelectronic synapse that shows both potentiation and depression characteristics triggered only by optical *** design of the artificial optoelectronic synapse,in which excitatory and inhibitory synaptic phototransistors are serially connected,enables these characteristics by spatiotemporally irradiating the phototransistor channels with optical ***,a negative synaptic weight can be realized without the need for electronic components such as *** such attributes,the artificial optoelectronic synapse is demonstrated to classify three digits with a high recognition rate(98.3%)and perform image preprocessing via analog vector-matrix multiplication.

关键词： amorphous oxide semiconductor analog processing artificial synapse neuromorphic optoelectronics

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Naturally occurring ribosome inactivating proteins might be key molecules against Covid-19 5

Naturally occurring ribosome inactivating proteins might be ...

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5h International Symposium on Multidisciplinary Studies and Innovative Technologies, ISMSIT 2021

作者： Arslan, Idris Aydin, Ozlem Birdal, Pelin Bülent Ecevit University Graduate School of Natural and Applied Sciences Biomedical Engineering Zonguldak Turkey

ISBN: (纸本)9781665449304

SARS-CoV-2 is a novel coronavirus with a major outbreak of unusual viral epidemic in Wuhan, China. To date, some certain vaccines have been approved by FDA so that spelling the end of pandemic globally but COVID-19 is still a global leading cause of death, with a descending rates. The existence of antiviral properties of ribosome inactivating proteins towards many human, animal and plant viruses are well-known for so many years. Ribosome inactivating proteins are naturally occurring substances and toxic N-glycosidase enzymes which depurinate both eukaryotic and prokaryotic rRNAs, hence arresting protein synthesis in the coarse of translation. Interestingly, some ribosome inactivating proteins can also remove the purine nucleotides from non-ribosomal RNAs. Undoubtly, removing the rRNA purine nucleotides effects the protein synthesis and therefore, triggers ribotoxic stress response that commences apoptosis. These proteins might similarly hamper specifically the viral circles in one and/or more points in their lifecycle. In present study, we have focused on naturally occurring ribosome inactivating proteins as promising agents for struggle against Covid-19 disease. © 2021 IEEE.

关键词： Coronavirus

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A 4-Channel 0.23$mm^{2}$ Voltage-to-Time Converter AFE with $3.7\mu V_{rms}$ Noise and $480nW$ Galvanic Impulse Uplink

A 4-Channel 0.23$mm^{2}$ Voltage-to-Time Converter AFE with ...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Mehdi Bandali Morgan Riley Benjamin C. Johnson Dept. of Electrical and Computer Engineering Boise State University Boise ID USA Morgan Riley is with Biomedical Engineering Doctoral Program Boise State Universitvy Boise ID USA

ISBN: (数字)9798350387179

ISBN: (纸本)9798350387186

We present a 4-channel 15 kS/s Voltage-to-Time Converter (VTC) analog front-end (AFE) with a $0.49\mu W$ impulse-based galvanic uplink for a peripheral nerve interface. Multiple, low-noise, high-data-rate channels are needed to sense compound action potentials and measure their conduction velocity as they propagate down a peripheral nerve. To achieve high energy efficiency for these constraints, the AFE encodes and transmits data with time-domain charge-balanced impulses through an implantable galvanic link. Each channel consists of an integrator with charge-based sampling and amplification for rapid multiplexing. A shared VTC encodes the amplitude-domain outputs of each integrator into differential time-domain impulses. Since the timing can be synchronized with stimulation, this AFE achieves instant artifact recovery after rail-to-rail stimulation events. We designed this AFE in a 180nm CMOS process, and the simulation results show an SNDR of 60dB and noise of $3.7\mu Vrms$ . Thanks to the new galvanic uplink protocol, this front-end only consumes $11.28\mu W$ including wireless data transmission for four channels.

关键词： Wireless communication Wireless sensor networks Protocols Simulation Noise Data communication Velocity measurement

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Tracking of Thermal Ablation Using US B-Mode and Elastography

Tracking of Thermal Ablation Using US B-Mode and Elastograph...

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Ultrasonics Symposium (LAUS), IEEE UFFC Latin America

作者： Edgar Taka Gonzalo Garay Wagner Pereira Guillermo Cortela Biomedical Engineering Program Federal University of Rio de Janeiro Rio de Janeiro Brazil Ultrasound Laboratory University of the Republic Montevideo Uruguay

ISBN: (数字)9798350349085

ISBN: (纸本)9798350349092

High Intensity Focused Ultrasound (HIFU), application minimizes the need for invasive surgery. This focused emitted energy can generate enough heat to cause irreversible protein denaturation of cells, making a thermal ablation injury. Tissue damages depend on the thermal dose promoted by HIFU. US elastography can provide information about changes in the stiffness of the affected volume (change on shear elastic modulus - μ). This fact allows an evaluation of the degree and extent of tissue ablation, which helps the conduct of treatment. Experimental setup consists of a high-power single element focused transducer to generate an intense ultrasonic field. A commercial elastography Supersonic Image Aixplorer with a SL10-2 transducer was used both to generate the US image and to emit the elastography pushes. Ex-vivo bovine skeletal muscle tissue (SMT) as sample was used with the fibers arranged along their length and the US transducer parallel to the fibers. The HIFU transducer placed perpendicular to the muscle fibers, applying energy four shots with PRF=60 s, and duty of 50 %. The elastography area was 28×28 mm2 and area of interest (ROI) was Ø10 mm. After HIFU shots, elastography evaluation at the focal point revealed changes in tissue elasticity (elastic modulus) that initially drops, then increases only after the fourth shot. That is when thermal ablation occurs (protein denaturation of the affected tissues).

关键词： Proteins Heating systems Transducers Ultrasonic imaging Tissue damage Surgery Muscles

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