3,051 results match your criteria operating voltage

Ecofriendly Solution-Combustion-Processed Thin-Film Transistors for Synaptic Emulation and Neuromorphic Computing.

ACS Appl Mater Interfaces 2021 Apr 13. Epub 2021 Apr 13.

Department of Electrical and Electronic Engineering, Xi'an Jiaotong-Liverpool University, Suzhou 215123, China.

The ecofriendly combustion synthesis (ECS) and self-combustion synthesis (ESCS) have been successfully utilized to deposit high- aluminum oxide (AlO) dielectrics at low temperatures and applied for aqueous InO thin-film transistors (TFTs) accordingly. The ECS and ESCS processes facilitate the formation of high-quality dielectrics at lower temperatures compared to conventional methods based on an ethanol precursor, as confirmed by thermal analysis and chemical composition characterization. The aqueous InO TFTs based on ECS and ESCS-AlO show enhanced electrical characteristics and counterclockwise transfer-curve hysteresis. Read More

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Screening of Electrospray-operating Parameters in the Production of Alginate-Royal Jelly Microbeads Using Factorial Design.

J Pharm Bioallied Sci 2020 Nov 5;12(Suppl 2):S703-S706. Epub 2020 Nov 5.

IKOP, Kuantan, Malaysia.

Introduction: Royal jelly (RJ) has been consumed as food or as a supplement because of its high nutritional and medicinal values. A fresh harvested RJ is yellowish to whitish in color and contains proteins, free amino acids, lipids, vitamins, and sugar. Without proper storage conditions, such as at 4°C, the color of RJ changes to much darker yellow and produces a rancid smell. Read More

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November 2020

High-power solid-state amplifier for superconducting radio frequency cavity test facility.

Rev Sci Instrum 2021 Mar;92(3):034704

Radio Frequency Systems Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India.

A horizontal test facility is set up at the Raja Ramanna Centre for Advanced Technology to test the superconducting radio frequency dressed cavities. Along with the cryomodule, control instrumentation, and the power coupler, this facility incorporates a high-power solid-state amplifier for establishing the desired cavity voltage gradient during the testing. This article describes the design, construction, rigorous testing, and measured results of this high-power solid-state radio frequency amplifier and its constituent components. Read More

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Absolute x-ray calibration of a gated x-ray framing camera for the Laser MegaJoule facility in the 0.1 keV-1 keV spectral range.

S Hubert F Boubault

Rev Sci Instrum 2021 Mar;92(3):035101

CEA-CESTA, F33116 Le Barp, France.

X-ray framing cameras (XRFCs) are routinely used at the Laser MegaJoule facility in x-ray imaging plasma diagnostics around the target chamber. Most of these diagnostics are based on multilayer x-ray toroidal mirrors under grazing incidence. The absolute calibration of the XRFCs is expressly expected both to optimize the signal-to-noise ratio for the dynamic range for specific experiments and to quantitatively process the data. Read More

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A MEMS Based Drug Delivery Device with Integrated Micro-Needle Array - Design and Simulation.

J Biomech Eng 2021 Apr 5. Epub 2021 Apr 5.

Department of Mechanical and Manufacturing Engineering, Ontario Tech University, Oshawa, Ontario, Canada.

One of the most effective treatments for type 1 and 2 diabetes is the administration of Insulin. Single needle mechanical insulin pumps are heavy and painful. Micro-needle based MEMS drug delivery devices can be an excellent solution for insulin dosing. Read More

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AlInGaAs Multiple Quantum Well-Integrated Device with Multifunction Light Emission/Detection and Electro-Optic Modulation in the Near-Infrared Range.

ACS Omega 2021 Mar 17;6(12):8687-8692. Epub 2021 Mar 17.

Grünberg Research Centre, Nanjing University of Posts and Telecommunications, Nanjing 210003, China.

A monolithic photonic chip with multifunctional light emission/detection and electro-optic modulation capabilities in the near-infrared range is proposed and realized on an InP-based wafer. Two identical AlInGaAs multiple quantum well (MQW) diodes operating independently as light emission/detection devices are fabricated using a two-step etching process on a single wafer and connected via a straight waveguide. The photocurrent induced in the MQW diode for the detection process is generated by the infrared light emitted by the MQW diode during the emission process and transmitted via the straight waveguide. Read More

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Performance assessment and economic perspectives of integrated PEM fuel cell and PEM electrolyzer for electric power generation.

Heliyon 2021 Mar 19;7(3):e06506. Epub 2021 Mar 19.

Universidad del Norte, Department of Mechanical Engineering, km 5 Antigua vía Puerto Colombia, Barranquilla, Colombia.

The study presents a complete one-dimensional model to evaluate the parameters that describe the operation of a Proton Exchange Membrane (PEM) electrolyzer and PEM fuel cell. The mathematical modeling is implemented in Matlab/Simulink® software to evaluate the influence of parameters such as temperature, pressure, and overpotentials on the overall performance. The models are further merged into an integrated electrolyzer-fuel cell system for electrical power generation. Read More

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Influence of Virchow-Robin spaces on the electric field distribution in subthalamic nucleus deep brain stimulation.

Clin Neurol Neurosurg 2021 Mar 9;204:106596. Epub 2021 Mar 9.

Department of Biomedical Engineering, Linköping University, Sweden; Center for Medical Image Science and Visualization, Linköping University, Linköping, Sweden.

Patient MRI from DBS implantations in the subthalamic nucleus (STN) were reviewed and it was found that around 10% had Virchow-Robin spaces (VRS). Patient-specific models were developed to evaluate changes in the electric field (EF) around DBS leads. The patients (n = 7) were implanted bilaterally either with the standard voltage-controlled lead 3389 or with the directional current-controlled lead 6180. Read More

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CMUT-Based Sensor for Acoustic Emission Application: Experimental and Theoretical Contributions to Sensitivity Optimization.

Sensors (Basel) 2021 Mar 14;21(6). Epub 2021 Mar 14.

Department of Applied Mechanics, CNRS/UFC/ENSMM/UTBM, FEMTO-ST Institute, University Bourgogne Franche-Comté, 25000 Besancon, France.

The paper deals with a capacitive micromachined ultrasonic transducer (CMUT)-based sensor dedicated to the detection of acoustic emissions from damaged structures. This work aims to explore different ways to improve the signal-to-noise ratio and the sensitivity of such sensors focusing on the design and packaging of the sensor, electrical connections, signal processing, coupling conditions, design of the elementary cells and operating conditions. In the first part, the CMUT-R100 sensor prototype is presented and electromechanically characterized. Read More

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Transparent capacitive micromachined ultrasound transducer linear arrays for combined realtime optical and ultrasonic imaging.

Opt Lett 2021 Apr;46(7):1542-1545

Transparent ultrasound transducers could enable many novel applications involving both ultrasonics and optics. Recently, we reported transparent capacitive micromachined ultrasound transducers (CMUTs) and demonstrated through-illumination photoacoustic imaging. This work presents the feasibility of transparent CMUTs for combined ultrasound imaging and through-array white-light imaging with a miniature camera placed behind the array. Read More

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Accuracy of the novel Peguero Lo-Presti criterion for electrocardiographic detection of left ventricular hypertrophy in a black African population.

J Clin Hypertens (Greenwich) 2021 Mar 29. Epub 2021 Mar 29.

Centre for Heart Rhythm Disorders, University of Adelaide and Royal Adelaide Hospital, Adelaide, Australia.

The diagnostic accuracy of the electrocardiogram for left ventricular hypertrophy (LVH) is limited. Recently, Peguero and collaborators proposed a novel voltage criterion for its detection with reportedly higher accuracy than the commonly used Cornell and Sokolow-Lyon criteria. While studies done in various populations have confirmed it, there are no available data from black African populations. Read More

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High-efficiency high-voltage class F amplifier for high-frequency wireless ultrasound systems.

PLoS One 2021 29;16(3):e0249034. Epub 2021 Mar 29.

Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, Gumi, Republic of Korea.

This paper presents a novel amplifier that satisfies both low distortion and high efficiency for high-frequency wireless ultrasound systems with limited battery life and size. While increasing the amplifier efficiency helps to address the problems for wireless ultrasound systems, it can cause signal distortion owing to harmonic components. Therefore, a new type of class F amplifier is designed to achieve high efficiency and low distortion. Read More

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Sub-thermionic, ultra-high-gain organic transistors and circuits.

Nat Commun 2021 03 26;12(1):1928. Epub 2021 Mar 26.

National Laboratory of Solid-State Microstructures, School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.

The development of organic thin-film transistors (OTFTs) with low power consumption and high gain will advance many flexible electronics. Here, by combining solution-processed monolayer organic crystal, ferroelectric HfZrO gating and van der Waals fabrication, we realize flexible OTFTs that simultaneously deliver high transconductance and sub-60 mV/dec switching, under one-volt operating voltage. The overall optimization of transconductance, subthreshold swing and output resistance leads to transistor intrinsic gain and amplifier voltage gain over 5. Read More

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An operator-independent artificial finger can differentiate anterior vaginal wall indentation parameters between control and prolapse patients.

J Biomech 2021 Mar 14;120:110378. Epub 2021 Mar 14.

University of Texas Southwestern Medical Center, USA. Electronic address:

In this study, the reproducibility and validity of an automated artificial finger for evaluating properties of vaginal wall tissue was assessed. The effect of angle and rate of indentation on displacing the anterior vaginal wall (AVW) was studied in control and prolapse patients. Following IRB approval, an automated artificial finger equipped with a calibrated piezoresistive sensor at its tip was used to induce 3-second AVW deformation sequences (10°, 15°, and 20° indentation). Read More

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Broad bandwidth air-coupled micromachined ultrasonic transducers for gas sensing.

Ultrasonics 2021 Mar 11;114:106410. Epub 2021 Mar 11.

GREMAN Laboratory UMR-CNRS 7347, University of Tours, 16 rue Pierre et Marie Curie, BP 7155, 37071 TOURS Cedex 2, France. Electronic address:

The present work aims to develop ultra-wide bandwidth air-coupled capacitive micromachined ultrasonic transducers (CMUTs) for binary gas mixture analysis. The detection principle is based on time-of-flight (ToF) measurements, in order to monitor gas ultrasound velocity variations. To perform such measurements, CMUTs were especially designed to work out of resonance mode, like a microphone. Read More

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Naphthalene dianhydride organic anode for a 'rocking-chair' zinc-proton hybrid ion battery.

Dalton Trans 2021 Mar 10;50(12):4237-4243. Epub 2021 Mar 10.

Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, 411008 Maharashtra, India.

Rechargeable batteries consisting of a Zn metal anode and a suitable cathode coupled with a Zn ion-conducting electrolyte are recently emerging as promising energy storage devices for stationary applications. However, the formation of high surface area Zn (HSAZ) architectures on the metallic Zn anode deteriorates their performance upon prolonged cycling. In this work, we demonstrate the application of 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA), an organic compound, as a replacement for the Zn-metal anode enabling the design of a 'rocking-chair'zinc-proton hybrid ion battery. Read More

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High-Power Gallium Nitride HIFU Transmitter with Integrated Real-Time Current and Voltage Measurement.

IEEE Trans Biomed Circuits Syst 2021 Mar 22;PP. Epub 2021 Mar 22.

High-Intensity Focused Ultrasound (HIFU) therapy provides a non-invasive technique with which to destroy cancerous tissue without using ionizing radiation. To drive large single-element HIFU transducers, ultrasound transmitters capable of delivering high powers at relevant frequencies are required. The acoustic power delivered to a transducers focal region will determine the treated area, and due to safety concerns and intervening layers of attenuation, control of this output power is critical. Read More

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Dielectric characterization of vegetable oils during a heating cycle.

J Food Sci Technol 2021 Apr 22;58(4):1480-1487. Epub 2020 Jul 22.

Electronics Department, Instituto Nacional de Astrofísica, Óptica Y Electrónica, Tonanzintla, Puebla, México.

The knowledge of the dielectric properties of oils is of great importance for several industrial applications, such as microwave-assisted oil frying for foods and high voltage electric power transmission. In this paper, we present the complex permittivity of vegetable oils (canola, olive, soybean, coconut) at 2.50 GHz using the cavity perturbation technique from 28 to 200 °C (temperature close to the smoking point of oils). Read More

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Application of ultrasound during electrode implantation for sacral neuromodulation in patients with neurogenic bladder secondary to spinal cord disease: a retrospective study.

Int Urol Nephrol 2021 Mar 20. Epub 2021 Mar 20.

Department of Urology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China.

Purpose: To compare the use of intraoperative ultrasound with X-ray fluoroscopy during sacral neuromodulation lead electrode placement in patients with neurogenic bladder secondary to spinal cord disease.

Methods: We reviewed the medical records of 52 patients who underwent sacral neuromodulation (SNM) lead electrode implantation under fluoroscopy or ultrasound guidance from July 2016 to July 2019. The operating time, number of electrode contacts with stimulus responses, minimum voltage that causes a stimulus response, and rate of standard lead electrode placement were used to assess the differences between the two methods. Read More

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Electrochemical Capacitor Performance of Nanotextured Carbon/Transition Metal Dichalcogenides Composites.

Small 2021 Mar 19:e2006821. Epub 2021 Mar 19.

Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, Poznan, 60965, Poland.

Transition metal dichalcogenides (TMDs) are emerging low-dimensional materials with potential applications for electrochemical capacitors (EC). Here, physicochemical and electrochemical characterizations of carbon composites with two sulfides ReS and FeS are reported. To enhance conductivity, multiwalled carbon nanotubes (NTs) serve as a support for ReS while 3D graphene-like network (3DG) is utilized for FeS deposition. Read More

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Impact of absorber layer thickness, defect density, and operating temperature on the performance of MAPbI solar cells based on ZnO electron transporting material.

Heliyon 2021 Mar 1;7(3):e06379. Epub 2021 Mar 1.

LM3ER-OTEA, Department of Physics, Faculty of Sciences and Techniques, Moulay Ismail University of Meknes, BP 509 Boutalamine 52000, Errachidia, Morocco.

Hybrid organic-inorganic perovskite solar cells (PSCs) are the novel fourth-generation solar cells, with impressive progress in the last few years. MAPbI is a cost-effective material used as an absorber layer in PSCs. Due to the different diffusion length of carriers, the electron transporting material (ETM) plays a vital role in PSCs' performance. Read More

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Correction of the measured current of a small-gap plane-parallel ionization chamber in proton beams in the presence of charge multiplication.

Z Med Phys 2021 Mar 13. Epub 2021 Mar 13.

National Physical Laboratory, Medical Radiation Science, Teddington, United Kingdom; MedAustron Ion Therapy Center, Medical Physics, Wiener Neustadt, Austria.

Purpose: The aims of this work are to study the response of a small-gap plane-parallel ionization chamber in the presence of charge multiplication and suggest an experimental method to determine the product of the recombination correction factor (k) and the charge multiplication correction factor (k) in order to investigate the latter.

Methods: Experimental data were acquired in scanned proton beams and in a Cobalt-60 beam. Measurements were carried out using an IBA PPC05 chambers of which the electrode gap is 0. Read More

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16-channel tunable and 25-Gb/s EAM-integrated DBR-LD for WDM-based mobile front-haul networks.

Opt Express 2021 Jan;29(2):1805-1812

We report a tunable distributed Bragg reflector-laser diode (DBR-LD) integrated with an electro-absorption-modulator (EAM) at an operating wavelength of 1.3 µm. This LD consists of gain, phase control (PC), DBR, and EAM sections, realized by using a butt-coupling technique in monolithically integrating the multiple quantum wells (MQWs) with the passive core and by applying an etched-mesa buried hetero-structure (EMBH) to the resonance cavity (i. Read More

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January 2021

Aqueous Rechargeable Zn-ion Batteries: Strategies for Improving the Energy Storage Performance.

ChemSusChem 2021 Mar 16. Epub 2021 Mar 16.

Functional Materials and Electrochemistry Lab, Department of Chemistry, Indian Institute of Technology, Kharagpur, 721302, West Bengal, India.

The growing demand for the renewable energy storage technologies stimulated the quest for efficient energy storage devices. In recent years, the rechargeable aqueous zinc-based battery technologies are emerging as a compelling alternative to the lithium-based batteries owing to safety, eco-friendliness, and cost-effectiveness. Among the zinc-based energy devices, rechargeable zinc-ion batteries (ZIBs) are drawing considerable attention. Read More

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Electrochemical Injection Oxygen Vacancies in Layered CaMnO for Boosting Zinc-Ion Storage.

ACS Appl Mater Interfaces 2021 Mar 9;13(11):13338-13346. Epub 2021 Mar 9.

Institute of Special Materials and Technology, Fudan University, Shanghai 200433, P. R. China.

Manganese-based compounds have emerged as attractive cathode materials for zinc-ion batteries owing to their high operating voltage, large specific capacity, and no pollution. However, the structural collapse and sluggish kinetics of manganese-based compounds are major obstacles that hinder their practical applications. Here, a kind of novel layered CaMnO with a low ion diffusion barrier and high structural stability has been achieved through an electrochemical charging process with in situ injecting oxygen vacancies. Read More

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Surface Facet Engineering in Nanoporous Gold for Low-Loading Catalysts in Aluminum-Air Batteries.

ACS Appl Mater Interfaces 2021 Mar 14;13(11):13097-13105. Epub 2021 Mar 14.

Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.

The performance of metal-air batteries and fuel cells depends on the speed and efficiency of electrochemical oxygen reduction reactions at the cathode, which can be improved by engineering the atomic arrangement of cathode catalysts. It is, however, difficult to improve upon the performance of platinum nanoparticles in alkaline electrolytes with low-loading catalysts that can be manufactured at scale. Here, the authors synthesized nanoporous gold catalysts with increased (100) surface facets using electrochemical dealloying in sodium citrate surfactant electrolytes. Read More

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Excellent electrochemical stability of Co3O4 array with carbon hybridization derived from metal-organic framework.

Nanotechnology 2021 Mar 11. Epub 2021 Mar 11.

Southern University of Science and Technology, Shenzhen, Guangdong, CHINA.

Hybrid supercapacitors have attracted considerable attention for the use in the energy storage systems due to the simultaneous possession of high power and energy. Herein, Co3O4 array with amorphous carbon on Ni foam has been derived from the Co-MOF. The electrochemical dynamics and energy storage mechanism of the prepared electrode have been investigated, which reveal the enhancement of the capacitive behavior with the scan rate. Read More

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