Artículos de revistas: "Alternating Device"

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Inganäs, Olle, Fengling Zhang y Mats R. Andersson. "Alternating Copolymers and Alternative Device Geometries for Organic Photovoltaics". AMBIO 41, S2 (marzo de 2012): 138–42. http://dx.doi.org/10.1007/s13280-012-0276-3.

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Yen, Hsi-Hsuan, Wen-Yung Yeh y Hao-Chung Kuo. "GaN alternating current light-emitting device". physica status solidi (a) 204, n.º 6 (junio de 2007): 2077–81. http://dx.doi.org/10.1002/pssa.200674766.

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Loginov, N. "MANIFUNCTIONAL MAGNETOHYDRODYNAMIC DEVICE". PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. SERIES: NUCLEAR AND REACTOR CONSTANTS 2021, n.º 2 (26 de junio de 2021): 116–26. http://dx.doi.org/10.55176/2414-1038-2021-2-116-126.

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Three types of magnetohydrodynamic devices using in liquid metal circulating loops are known. These are electromagnetic pumps, flow meters, and throttles. Electromagnetic pumps and throttles are induction type, as a rule, using alternating current and alternating magnetic field. Electromagnetic flowmeters for liquid metals, as a rule, are conduction type using direct current and permanent magnetic field. Every of each device serves one function only. Operating principle and some designs of universal conduction magnetohydrodynamic devices, which are possible provide simultaneously two of three functions, (pump and flow meter, or throttle and flow meter) are described at the paper. They are called pump-flow meter and throttle-flow meter. These devices are proposed for small experimental facilities with flow rate of liquid metal 1-500 l/h and for auxiliary circulating loops of big facilities. Theoretical basis of fulfilment of two function simultaneously and needed mathematical formulas presented at the paper. Three variants of pump-flow meters tested and corresponding results are described.

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Clarke, K. L., D. M. Sainato y M. E. Ward. "Travel Performance of Preschoolers: The Effects of Mobility Training with a Long Cane versus a Precane". Journal of Visual Impairment & Blindness 88, n.º 1 (enero de 1994): 19–30. http://dx.doi.org/10.1177/0145482x9408800105.

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Using a single-subject alternating treatments design, this study compared the effectiveness of a long cane and a precane device as an initial protective device for preschool children. The authors found that the precane device was the easier of the two devices for the young children to use appropriately, and it protected the children from body contact with travel obstacles to a greater extent than did the long cane.

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Mary Shamala L., Zayaraz G., Vivekanandan K. y Vijayalakshmi V. "A Tweakable Key Alternating Lightweight Cipher for Internet of Things". International Journal of Information Security and Privacy 14, n.º 4 (octubre de 2020): 113–33. http://dx.doi.org/10.4018/ijisp.2020100107.

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Internet of things (IoT) is a global network of uniquely addressable interconnected things, based on standard communication protocols. As the number of devices connected to the IoT escalates, they are becoming a likely target for hackers. Also, the limited resources of IoT devices makes the security on top of the actual functionality of the device. Therefore, the cryptographic algorithm for such devices has to be devised as small as possible. To tackle the resource constrained nature of IoT devices, this article presents a lightweight cryptography algorithm based on a single permutation and iterated Even-Mansour construction. The proposed algorithm is implemented in low cost microcontrollers, thus making it suitable for a wide range of IoT nodes.

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SHEVLYUGIN, Maksim V. y Daria V. SEMENOVA. "Improving the Efficiency of High-Speed AC Contact Suspension". Elektrichestvo 5, n.º 5 (2021): 39–43. http://dx.doi.org/10.24160/0013-5380-2021-5-39-43.

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When developing a high-speed contact suspension for railways electrified with alternating current, it is important to ensure that the electric rolling stock passes the neutral insert without turning off the current and without reducing the speed of movement. The article provides an analysis of previously developed devices in the field of power supply of electrified railways of single-phase alternating current, in which an attempt was made to pass an electric rolling stock of a neutral insert without disconnecting the load. The device of isolating coupling of a catenary and a neutral insert for high-speed railway lines electrified on alternating current is described. In this case, the passage of the neutral insert is carried out under current and braking of the electric rolling stock will not occur. Among other things, to improve the efficiency of high-speed contact suspension for railways electrified with alternating current, it is proposed to use new materials and new technologies that can be used in the device of insulating coupling of the catenary

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7

Danilatos, Gerasimos D. "Radiofrequency Gaseous Detection Device". Microscopy and Microanalysis 6, n.º 1 (enero de 2000): 12–20. http://dx.doi.org/10.1017/s1431927600000027.

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A radiofrequency gaseous detection device is proposed for use with instruments employing charged particle beams, such as electron microscopes and ion beam technologies, as well as for detection of ionizing radiations as in proportional counters. An alternating (oscillating) electromagnetic field in the radiofrequency range is applied in a gaseous environment of the instrument. Both the frequency and amplitude of oscillation are adjustable. The electron or ion beam interacts with a specimen and releases free electrons in the gas. Similarly, an ionizing radiation source releases free electrons in the gas. The free electrons are acted upon by the alternating electromagnetic field and undergo an oscillatory motion resulting in multiple collisions with the gas molecules, or atoms. At sufficiently low pressures, the oscillating electrons also collide with surrounding walls. These processes result in an amplified electron signal and an amplified photon signal in a controlled discharge. The amplified signals, which are proportional to the initial number of free electrons, are collected by suitable means for further processing and analysis.

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Kozak, Yulia A. "The way of air environment decontamination in departments for poultry meat ready-to-cook products production". Poultry and Chicken Products 26, n.º 2 (2024): 44–46. http://dx.doi.org/10.30975/2073-4999-2024-26-2-44-46.

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Devices for air decontamination usage in departments for poultry meat cutting up and ready-to-cook products making gives the possibility to reduce the department air environment and carcasses surfaces microbial insemination. These devices doesn’t influence on poultry meat sensory and physic-chemical properties but increases shelf-life by one day. This device works at the base of repeated exposure of constant electrical fields with alternating polarity on microorganisms. One device is counted on 60 m3 of air in the room.

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9

Danilatos, Gerasimos D. "Radiofrequency Gaseous Detection Device". Microscopy and Microanalysis 6, n.º 1 (enero de 2000): 12–20. http://dx.doi.org/10.1007/s100059910001.

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Abstract A radiofrequency gaseous detection device is proposed for use with instruments employing charged particle beams, such as electron microscopes and ion beam technologies, as well as for detection of ionizing radiations as in proportional counters. An alternating (oscillating) electromagnetic field in the radiofrequency range is applied in a gaseous environment of the instrument. Both the frequency and amplitude of oscillation are adjustable. The electron or ion beam interacts with a specimen and releases free electrons in the gas. Similarly, an ionizing radiation source releases free electrons in the gas. The free electrons are acted upon by the alternating electromagnetic field and undergo an oscillatory motion resulting in multiple collisions with the gas molecules, or atoms. At sufficiently low pressures, the oscillating electrons also collide with surrounding walls. These processes result in an amplified electron signal and an amplified photon signal in a controlled discharge. The amplified signals, which are proportional to the initial number of free electrons, are collected by suitable means for further processing and analysis.

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10

Chen, Shi-Rui y Wing-Kit Choi. "P‐264: Fast‐Response FFS LC Device with Multi‐rubbing Angle for VR Applications". SID Symposium Digest of Technical Papers 55, n.º 1 (junio de 2024): 2075–77. http://dx.doi.org/10.1002/sdtp.18011.

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In this paper, we propose new fast response FFS LC devices with virtual walls by using alternating (or multi) rubbing directions, which can be generated by using photo‐alignment. These new devices can offer much‐enhanced response‐speed compared to the conventional FFS LC device. By choosing different types of “local” LC molecular arrangements or designs (easily achievable by using photo‐alignment), we may be able to alter the virtual wall pitch length, and hence also alter the response speed and transmission of these fast response LC devices. These new designs can provide a new and alternative approach to generating virtual walls by “locally” varying the rubbing angle using photo‐alignment. These devices are attractive for VR applications where high speed operation of liquid crystal devices is required.

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11

Agunov, Aleksandr, Il'ya Terehin, Deni Lavruhin y Ivan Baranov. "Development of Stationary Device for Diagnostics of Low-Maintenance Grounding System of Catenary Poles Being on Alternating Current". Proceedings of Petersburg Transport University 19, n.º 3 (25 de septiembre de 2022): 515–27. http://dx.doi.org/10.20295/1815-588x-2022-3-515-527.

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Purpose: Development of the device for diagnostics and monitoring the state of grounding system of catenary poles in real time to create a comprehensive solution to the problem of low-maintenance grounding system of catenary poles. Methods: Comparison of the characteristics of element base for the device depending on application geographical area; electrical calculations for element selection from existing elements on the market. Results: Different solutions are considered as well as the most optimal ones for creating the device for diagnosing and monitoring the state of grounding system for catenary poles in real time are identified and summarized. Practical significance: Urgent necessity in the existing realities in creating and implementing devices for realtime diagnosing and monitoring power supply systems, including power supply ones of railroads, grounding system for catenary poles, is shown. Calculations for the given device by geographical zones are presented and also, real, the most optimal elements for such device from existing ones on the market are shown.

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12

Silva, Raphaela K. S., Sakandar Rauf, Ming Dong, Liang Chen, Hakan Bagci y Khaled N. Salama. "3D Concentric Electrodes-Based Alternating Current Electrohydrodynamics: Design, Simulation, Fabrication, and Potential Applications for Bioassays". Biosensors 12, n.º 4 (6 de abril de 2022): 215. http://dx.doi.org/10.3390/bios12040215.

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Two-dimensional concentric asymmetric microelectrodes play a crucial role in developing sensitive and specific biological assays using fluid micromixing generated by alternating current electrohydrodynamics (ac-EHD). This paper reports the design, simulation, fabrication, and characterization of fluid motion generated by 3D concentric microelectrodes for the first time. Electric field simulations are used to compare electric field distribution at the electrodes and to analyze its effects on microfluidic micromixing in 2D and 3D electrodes. Three-dimensional devices show higher electric field peak values, resulting in better fluid micromixing than 2D devices. As a proof of concept, we design a simple biological assay comprising specific attachment of streptavidin beads onto the biotin-modified electrodes (2D and 3D), which shows ~40% higher efficiency of capturing specific beads in the case of 3D ac-EHD device compared to the 2D device. Our results show a significant contribution toward developing 3D ac-EHD devices that can be used to create more efficient biological assays in the future.

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13

Terrier, Véronique. "Characterization of real time iterative array by alternating device". Theoretical Computer Science 290, n.º 3 (enero de 2003): 2075–84. http://dx.doi.org/10.1016/s0304-3975(02)00489-9.

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14

Zhao, Wentao y Shaowei Wang. "Resource Allocation for Device-to-Device Communication Underlaying Cellular Networks: An Alternating Optimization Method". IEEE Communications Letters 19, n.º 8 (agosto de 2015): 1398–401. http://dx.doi.org/10.1109/lcomm.2015.2444403.

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15

Kamarudin, Nazhatul Hafizah, Mohammad Arif Ilyas, Saidatul Izyanie Kamarudin y Marizuana Mat Daud. "DEPLOYMENT OF SENSOR NETWORKS FOR EFFICIENT POWER CONSUMPTION MONITORING APPLICATION". Journal of Information System and Technology Management 8, n.º 33 (10 de diciembre de 2023): 127–38. http://dx.doi.org/10.35631/jistm.833011.

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This paper presents a wireless monitoring system implemented using a wireless sensor network and the XCTU software. The existing monitoring systems for tracking alternating current utilization in various devices face limitations in terms of real-time data acquisition and seamless wireless transmission to a central computer for comprehensive analysis. This hinders the ability to accurately measure electric current consumption, impeding the development of efficient energy management strategies. Therefore, the primary focus of this monitoring system is to wirelessly track the utilization of alternating current in various devices. The wireless monitoring system relies on the integration of the XBEE device and the SCT 013 current sensor. The SCT 013 current sensor accurately measures electric current consumption, exhibiting a mere 0.03 variation, while the XBEE device is employed to transmit this data wirelessly to a computer for subsequent data analysis. In this configuration, the XBEE operates in AT mode for seamless data transfer to the computer.

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16

Hwang, Do-Hoon, Moo-Jin Park, Jae-Hoon Eom, Hong Ku Shim, Seongtaek Lee, Nam Choul Yang, Duan Lian, Min Chul Suh y Byung Doo Chin. "Synthesis of a New Polymeric Host Material for Efficient Organic Electro-Phosphorescent Devices". Journal of Nanoscience and Nanotechnology 8, n.º 9 (1 de septiembre de 2008): 4649–52. http://dx.doi.org/10.1166/jnn.2008.ic73.

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We have synthesized a new polymeric host material for phosphorescent dyes, which can be used in phosphorescent light-emitting layers. An alternating copolymer, composed of N-alkylcarbazole and tetramethylbenzene units was synthesized through the Suzuki coupling reaction. We fabricated electro-phosphorescent devices using the synthesized polymeric host doped with solution-processible green and red phosphorescent dyes. Light-emitting devices have an ITO/PEDOT/polymer + dopant/Balq3/Alq3/LiF/Al configuration. The device containing one of two studied green dopants (designated as green 1) in the polymeric host showed the best performance, with a maximum luminous efficiency of 29 cd/A. A thin film of this polymeric was successfully patterned by laser-induced thermal imaging (LITI), and an electro-phosphorescent device was fabricated using the patterned film. This patterned device showed performance characteristics similar to those of a spin-coated device.

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Adhikari, Manav. "THE COMPARATIVE STUDY OF STATCOM WITH FC-TCR AND SSSC". International Journal of Engineering Technologies and Management Research 2, n.º 3 (30 de enero de 2020): 1–8. http://dx.doi.org/10.29121/ijetmr.v2.i3.2015.475.

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The Flexible Alternating Current Transmission Systems (FACTS) device deals with the control of power flow, alternating current of transmission line and immediately respond towards the stability problems of the system. The present paper show that how the FACTS devices enhance the different parameter of the power systems like power transfer capacity of line, system stability etc. In MATLAB a simplified transmission system is modeled and the resultant power (PQ) and voltage profiles are studied as an uncompensated system. Now the same transmission system is simulating with FACTS device i.e. Static Synchronous Series Compensator (SSSC), Fixed Capacitor Thyristor Controlled Reactor (FC-TCR) and Static Synchronous Compensator (STATCOM). The result obtained after simulation provide the power and voltage profiles, are analyzed as a compensated system. Finally we found that a compensated system have better voltage profile and power flow w.r.t. an uncompensated system.

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Obagade, T. A. y S. G. Konyeha. "Development of Alternating Current (AC) Line Monitoring Device for Power System Management". Nigeria Journal of Pure and Applied Physics 9, n.º 1 (21 de abril de 2020): 17–22. http://dx.doi.org/10.4314/njpap.v9i1.4.

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This work presents a study of the effect of imbalance between the supply of and demand of power from the National grid on electrical appliances. In the study, an alternating current (ac) line monitoring device was developed using arduino microcontroller to carry out the investigation. The device is a single system capable of measuring both the main frequency and nominal voltage of electricity supply. The device consists of seven major components: 12 V step-down transformer, half-wave rectifier, attenuator, wave-shaping circuit, arduino microcontroller, Liquid crystal display and micro SD card. The heart of the device is the arduino microcontroller that reads the period of the pulses from the shaping circuit and the output voltage from the scale resistor connected to the attenuator circuit in order to measure the levels frequency and voltage of the ac main source. By graphically compared the reading of the voltage obtained by the ac monitoring device with that of the standard Mastech voltmeter, it was shown that the device has a good correlation with the standard voltmeter with a deviation of ±0.21%, and this has proven that the device is capable of measuring ac voltage accurately. From the frequency test level results, it was found that the frequency measured by the device closely related to the frequency measured by the standard frequency meter. This shows that the device satisfied the requirement of the overall design. Hence, it can be used in the laboratory for demonstration and research purposes as well as in power plant industries. Keywords: Mains frequency, nominal voltage, half-wave rectifier, attenuator, wave-shaping circuit, Arduino microcontroller

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Yue, Yun kai y Tian bo Wu. "Analysis of abnormal heating of 66kV dry-type air-core reactor grounding device". Journal of Physics: Conference Series 2237, n.º 1 (1 de marzo de 2022): 012014. http://dx.doi.org/10.1088/1742-6596/2237/1/012014.

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Abstract When dry-type air-core reactors are in operation, the surrounding grounding devices, fences and other closed structural parts are abnormally hot. Because there is no effective analysis and detection methods for concealed projects such as grounding devices, it brings great difficulties to on-site analysis of problems; this article is based on the site conditions Theoretical analysis and the use of ground penetrating radar detection technology to study a 66kV dry-type reactor grounding device abnormal heating problem, through the analysis of the detection results, it is found that the reason for the heating of the dry anti-grounding device is that the grounding device has a circulating current in the alternating field; The design and construction of grounding devices of dry-type air-core reactors in new projects will provide certain reference significance.

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Lu, Ya Ping, Tian Lin Song y Hai Qing Liu. "Influence of Silicon Controlled Rectifier Voltage Regulation Device under DDC-Temperature Control". Advanced Materials Research 706-708 (junio de 2013): 826–29. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.826.

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In the boiler heating control device of combining DDC and the silicon controlled rectifier voltage regulation device, there are phase shift trigger, pulse width modulation (PWM) and cycle wave cross zero trigger (CYC). Under the different silicon controlled rectifier voltage regulation devices, there are different influences for DDC. It makes the best of the cycle characteristics of the alternating current (AC) for the cycle wave cross zero trigger (CYC). For DDC - temperature control system, there are advantages of high control accuracy, less interference and power source pollution.

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Hassan, A. y R. Sajjad. "ID: 16: INAPPROPRIATE DEFIBRILLATION DUE TO ELCTRO-MAGNETIC INTERFERENCE FROM NEARBY ALTERNATING CURRENT". Journal of Investigative Medicine 64, n.º 4 (22 de marzo de 2016): 925.1–925. http://dx.doi.org/10.1136/jim-2016-000120.30.

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IntroductionImplantable cardioverter-defibrillator (ICD) to monitor and promptly treat life-threatening arrhythmia has been a very successful approach. However, inappropriate defibrillation could increase morbidity and mortality. Most common causes of inappropriate defibrillation are: supra-ventricular arrhythmia and device malfunctions.Case DescriptionA 31-year-old female with arrythmogenic right ventricular cardiomyopathy (ARVC) status post dual chamber ICD presented after her ICD had fired. Patient was sitting near a public swimming pool and suddenly felt a jolt, “getting hit at the back of the head”. On further ICD Interrogation revealed a high frequency artifact on the intra-cardiac electrogram which was sensed by the device as ventricular fibrillation, and subsequently it was defibrillated. Other parameters including sensing and pacing thresholds, lead impedances were all within normal limits.DiscussionAlternating current from a nearby electric generator created Electro-magnetic interference (EMI) which led to inappropriate defibrillation. High frequency oscillating artifact is the hallmark of EMI from alternating current. We should be aware of all possible causes that can interfere with cardiac devices. .

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Wilde, Christian, Ralf Bruder, Sonja Binder, Lisa Marshall y Achim Schweikard. "Closed-loop transcranial alternating current stimulation of slow oscillations". Current Directions in Biomedical Engineering 1, n.º 1 (1 de septiembre de 2015): 85–88. http://dx.doi.org/10.1515/cdbme-2015-0022.

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AbstractTranscranial alternating current stimulation (tACS) is an emerging non-invasive tool for modulating brain oscillations. There is evidence that weak oscillatory electrical stimulation during sleep can entrain cortical slow oscillations to improve the memory consolidation in rodents and humans. Using a novel method and a custom built stimulation device, automatic stimulation of slow oscillations in-phase with the endogenous activity in a real-time closed-loop setup is possible. Preliminary data from neuroplasticity experiments show a high detection performance of the proposed method, electrical measurements demonstrate the outstanding quality of the presented stimulation device.

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Krasnov, Alex N. "Selection of dielectrics for alternating-current thin-film electroluminescent device". Thin Solid Films 347, n.º 1-2 (junio de 1999): 1–13. http://dx.doi.org/10.1016/s0040-6090(98)01763-5.

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Cheng, Yajun, Mingzhi Yang, Qianxuan Wang, Lei Zhang, Xueliang Li, Dongrun Liu y Tongtong Lin. "Testing device for aerodynamic alternating loads on a train cabin". Journal of Wind Engineering and Industrial Aerodynamics 247 (abril de 2024): 105683. http://dx.doi.org/10.1016/j.jweia.2024.105683.

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Zhang, Yiyue, Masoumeh Keshavarz, Elke Debroye, Eduard Fron, Miriam Candelaria Rodríguez González, Denys Naumenko, Heinz Amenitsch et al. "Two-dimensional perovskites with alternating cations in the interlayer space for stable light-emitting diodes". Nanophotonics 10, n.º 8 (1 de junio de 2020): 2145–56. http://dx.doi.org/10.1515/nanoph-2021-0037.

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Abstract Lead halide perovskites have attracted tremendous attention in photovoltaics due to their impressive optoelectronic properties. However, the poor stability of perovskite-based devices remains a bottleneck for further commercial development. Two-dimensional perovskites have great potential in optoelectronic devices, as they are much more stable than their three-dimensional counterparts and rapidly catching up in performance. Herein, we demonstrate high-quality two-dimensional novel perovskite thin films with alternating cations in the interlayer space. This innovative perovskite provides highly stable semiconductor thin films for efficient near-infrared light-emitting diodes (LEDs). Highly efficient LEDs with tunable emission wavelengths from 680 to 770 nm along with excellent operational stability are demonstrated by varying the thickness of the interlayer spacer cation. Furthermore, the best-performing device exhibits an external quantum efficiency of 3.4% at a high current density (J) of 249 mA/cm2 and remains above 2.5% for a J up to 720 mA cm−2, leading to a high radiance of 77.5 W/Sr m2 when driven at 6 V. The same device also shows impressive operational stability, retaining almost 80% of its initial performance after operating at 20 mA/cm2 for 350 min. This work provides fundamental evidence that this novel alternating interlayer cation 2D perovskite can be a promising and stable photonic emitter.

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Shen, Chen, Jiachi Ye, Nicola Peserico, Yaliang Gui, Chaobo Dong, Haoyan Kang, Behrouz Movahhed Nouri et al. "Enhancing Focusing and Defocusing Capabilities with a Dynamically Reconfigurable Metalens Utilizing Sb2Se3 Phase-Change Material". Nanomaterials 13, n.º 14 (19 de julio de 2023): 2106. http://dx.doi.org/10.3390/nano13142106.

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Metalenses are emerging as an alternative to digital micromirror devices (DMDs), with the advantages of compactness and flexibility. The exploration of metalenses has ignited enthusiasm among optical engineers, positioning them as the forthcoming frontier in technology. In this paper, we advocate for the implementation of the phase-change material, Sb2Se3, capable of providing swift, reversible, non-volatile focusing and defocusing within the 1550 nm telecom spectrum. The lens, equipped with a robust ITO microheater, offers unparalleled functionality and constitutes a significant step toward dynamic metalenses that can be integrated with beamforming applications. After a meticulously conducted microfabrication process, we showcase a device capable of rapid tuning (0.1 MHz level) for metalens focusing and defocusing at C band communication, achieved by alternating the PCM state between the amorphous and crystalline states. The findings from the experiment show that the device has a high contrast ratio for switching of 28.7 dB.

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Zhao, Zhe, Dawen Jiao, Ping Hu, Jing Zhang, Pei Cui y Junjun Lv. "Design and Verification of Low Frequency Alternating Magnetic Field Detection Device Based on Unstable Platform". Journal of Physics: Conference Series 2486, n.º 1 (1 de mayo de 2023): 012054. http://dx.doi.org/10.1088/1742-6596/2486/1/012054.

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Abstract Low frequency alternating magnetic field is one of the important features for marine magnetic field detection. In order to realize the effective detection of low-frequency alternating magnetic field signal in the marine environment, a low-frequency alternating magnetic field detection device based on unstable platform was designed based on the low-power optical pump magnetometer and signal control processing circuit in this paper. The magnetic field signal can be stored. The power spectrum analysis, line spectrum purification, line spectrum extraction and so on can be processed online, and the processing results are saved and transmitted to the upper computer through serial communication. The test results of laboratory and offshore signal source show that the device has good ability of low frequency alternating magnetic field measurement, analysis and line spectrum extraction.

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Hu, Bin y Paul Calvert. "Printed Electroluminescent Fabrics". Advances in Science and Technology 100 (octubre de 2016): 27–30. http://dx.doi.org/10.4028/www.scientific.net/ast.100.27.

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Electroluminescence offers a versatile and simple route to printed light sources. A layer of poly (3,4-ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) was inkjet printed onto polyethylene terephthalate (PET) mesh fabrics. The conductivity–transparency relationship is determined for textile-based conductors with different thicknesses of the printed PEDOT:PSS film. Alternating current powder electroluminescent devices were made by extrusion printing a layer of phosphor onto aluminum foil and then covering this with a fabric electrode. These devices are compared with indium tin oxide (ITO) glass electrodes on a similar device. Textiles coated with conducting polymers are a potential alternative to coated polymer films for flexible, transparent conductors. The strain response of these electrodes was improved by incorporating carbon nanotubes into the conductor. These bridge cracks that form on stretching.

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Schaller, Richard J., J. Stephen Huff y Allan Zahn. "Comparison of a Colorimetric End-Tidal CO2 Detector and an Esophageal Aspiration Device for Verifying Endotracheal Tube Placement in the Prehospital Setting: A Six-Month Experience". Prehospital and Disaster Medicine 12, n.º 1 (marzo de 1997): 57–63. http://dx.doi.org/10.1017/s1049023x00037237.

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AbstractIntroduction:Hand held, colorimetric, end-tidal CO2 detector devices are being used to verify correct endotracheal tube (ETT) placement. The accuracy of these devices has been questioned in situations of cardiac arrest. The use of the esophageal detector device (EDD) is an easy alternative for detection of ETT placement, and may be more accurate in situations of cardiac arrest.Hypothesis:The use of the esophageal aspiration device in comparison with a colorimetric end-tidal CO2 detector is more accurate in detecting proper ETT placement and easier to use in the prehospital setting than is the colorimetric end-tidal CO2 detection device.Methods:This was a prospective alternating weeks, 6-month study in a prehospital setting. Participants included all patients older than 18 years who were intubated by the Portsmouth, Virginia Emergency Medical Services (EMS) personnel from 01 July 1993 through 31 December 1993. The aspiration device used, also known as an esophageal detector device (EDD), was a 60 ml, luer-lock syringe attached to a 15 mm ETT adapter. Its efficacy was compared with an already accepted method of ETT position detection, the colorimetric endtidal CO2 detector. Each device was used on alternating weeks, and correct ETT placement was determined by the receiving emergency department physician using standard techniques. Chi-square analysis and Fisher's Exact test were used to compare parameters, time of device use, and ease of use. Sensitivity and specificity were calculated, and provider preference was assessed using a survey instrument administered following completion of the study.Results:There were 49 patients who met the inclusion criteria, but six were excluded because of situational circumstances rendering use of the device a possible compromise of patient care. Twenty-five patients were in the EDD group, and 18 were in the endtidal CO2 detector group. There was no statistically significant difference detected between groups for the gender ratio, underlying condition, CPR in progress, perceived difficulty of intubation, or percentage of nasotracheal intubation. The EDD was significantly easier to use (p<0.005). There was no statistically significant difference in time required for use of end-tidal CO2 detector device versus the EDD. The sensitivity and specificity for correct tracheal placement using the EDD was 100%, and the sensitivity for correct tracheal placement using the end-tidal CO2 detector device was 78%. Use of the EDD was preferred over use of the end-tidal CO2 detector device by 75% of participating EMS providers. One case of nasotracheal intubation with an ETT placement above the cords raised the question of accuracy of this device in situations where direct visualization is not utilized.Conclusion:The EDD was accurate in all cases of orotracheal intubation, and was easier to use than was end-tidal CO2 detector device. It was preferred by 75% of participating EMS providers. In cases in which the ETT may be above the vocal cords, caution must be used with interpreting the results obtained by use of the EDD.

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Sesler, Jefferson M., Wendy P. Munroe y James M. McKenney. "Clinical Evaluation of a Finger Oscillometric Blood Pressure Device". DICP 25, n.º 12 (diciembre de 1991): 1310–14. http://dx.doi.org/10.1177/106002809102501204.

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An oscillometric blood pressure (BP) device designed for recording systemic BP from a finger was compared with a random-zero, mercury-column sphygmomanometer in 76 subjects recruited from the patient population and staff of a primary-care center. After both devices were placed on the left arm or finger of the left hand, three BP readings were obtained with each device in alternating fashion, thereby according random assignment. The mean for all measurements was 119.2/72.4 mm Hg for the finger device and 118.6/75.3 mm Hg for the random-zero sphygmomanometer, systolic readings were not different (p=0.53) but diastolic readings were different (p=0.001). There were considerable differences among the readings obtained with the two devices in individual patients: the mean differences ± tolerance limits for readings obtained with the finger device compared with the random-zero device were 0.6 ± 33.5 mm Hg for systolic and −2.9 ± 25.3 mm Hg for diastolic readings. There was also considerable variability in the readings obtained with the finger device; the minimum to maximum differences in 39 systolic (51 percent) and 26 diastolic readings (34 percent) were greater than 10 mm Hg with the finger device; 24 systolic (32 percent) and 11 diastolic readings (14 percent) differed by this amount with the random-zero device. The variability in measurements made with the finger device was significantly different from the random-zero device for diastolic pressures (p=0.0048) but not for systolic pressures (p=0.8729). Based on the experience obtained in this study, devices to measure BP from the finger cannot be recommended for routine use.

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31

Shawky El-sayed, Ahmed, Abdelgawad Saad, Mohamed Ali Ibrahim Al-rajhi y Maisa Megahed. "Development of a Solar-Powered Barley Sprouting Room". Turkish Journal of Agricultural Engineering Research 5, n.º 1 (28 de mayo de 2024): 94–116. http://dx.doi.org/10.46592/turkager.1467904.

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The study aims to develop a sprouting room for barley powered by solar energy instead of traditional alternating-current rooms to suit remote areas. The cooling, lighting, and irrigation systems were developed and replaced with another that operates on 12 V DC. An air cooling device based on the Peltier module has been developed as an alternative to air conditioning devices. Four cooling units of the air cooler were tested with three lighting durations of 6, 9, and 12 h and three irrigation rates of 1.7, 1.85, and 2 m3 ton-1. The measurements included evaluating the performance of the developed air cooler device. The vegetative and quality characteristics and a chemical analysis of sprouted barley for the solar-powered room compared to the room before the modification were estimated. The solar room's productivity and electrical energy consumption rates were estimated, and an economic evaluation of the development was conducted. The maximum electrical power consumption for the solar-powered sprouting room was 63.275 kWh ton-1, compared with 117.19 kWh ton-1 for the alternating current-managed room before modification. The interaction between the utilized developing DC air cooling, lighting, and irrigation achieved standard rates for the produced barley vegetative and quality characteristics. The maximal productivity from sprouted barley was 1.22 tons, per 7 days with an increment ratio over control of 31.97%. The net earnings for the developed sprouting room were maximized relative to the significant decrease in electrical production costs. The developed room fits the livestock sector by providing good economic alternative fodder sources.

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Кочубей, Анатолий, Anatoliy Kochubey, Валерий Лебедев, Valeriy Lebedev, Юрий Вернигоров, Yuriy Vernigorov, Ирина Чумак y Irina Chumak. "Power aspects of parts strengthening processing under rotating field conditions". Science intensive technologies in mechanical engineering 1, n.º 6 (16 de junio de 2016): 35–42. http://dx.doi.org/10.12737/20139.

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The purpose of this theoretical investigation is the modeling of finish-strengthening under conditions of a rotating field for the definition of ferromagnetic indenter kinematic properties. This method is based on functioning devices offered by D.D. Logvinenko. The basis of these devices is an inductor located into the case. This inductor represents a modified stator of an induction motor. In the stator bore there is installed a cylindrical pipe made of nonmagnetic material the inner surface of which limits a working area of the device. From the obtained results of theoretical researches it follows that the kinematic properties of ferromagnetic indenters are defined by field parameters – induction of a direct and an alternating fields, frequency and gradient of induction of an alternating field, and also magnetic and inertial properties of indenters.

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Wu, Li Shuang y Hui Shan Yang. "Enhancement of Electroluminescence Efficiency for Organic Light-Emitting Devices due to the Introduction of the Well as Excton Confine Structure". Advanced Materials Research 785-786 (septiembre de 2013): 718–23. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.718.

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An organic emitting device with well structure is reported. The well structure fabricated by alternating deposition of constituent tris-(8-hydroxyquinoline) aluminum (Alq) and 4, 7-diphenyl-1, 10-phenanthroline (BPhen) layers improved the current efficiency. The enhanced efficiency can be attributed to the strong accumulation of electrons and holes in the emitting layer, which leads to an increase of the exciton formation and exciton recombination probability. The single well device exhibits the highest current efficiency of 4.12cd/A at 4V, which is more than 1.2 times than that of the conventional organic light-emitting devices. It is an effective and simple way to improve the efficiency of the organic devices by utilizing well structure as the emitting layer with proper well number.

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Chae, Dong-Hun, Mattias Kruskopf, Jan Kucera, Jaesung Park, Ngoc Thanh Mai Tran, Dan Bee Kim, Klaus Pierz et al. "Investigation of the stability of graphene devices for quantum resistance metrology at direct and alternating current". Measurement Science and Technology 33, n.º 6 (9 de marzo de 2022): 065012. http://dx.doi.org/10.1088/1361-6501/ac4a1a.

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Abstract Interlaboratory comparisons of the quantized Hall resistance (QHR) are essential to verify the international coherence of primary impedance standards. Here, we report on the investigation of the stability of p-doped graphene-based QHR devices at direct and alternating currents at CMI, KRISS, and PTB. To improve the stability of the electronic transport properties of the polymer-encapsulated devices, they were shipped in an over-pressurized transport chamber. The agreement of the quantized resistance with R K/2 at direct current was on the order of 1 nΩ Ω−1 between 3.5 and 7.5 T at a temperature of 4.2 K despite changes in the carrier density during the shipping of the devices. At alternating current, the quantized resistance was realized in a double-shielded graphene Hall device. Preliminary measurements with digital impedance bridges demonstrate the good reproducibility of the quantized resistance near the frequency of 1 kHz within 0.1 μΩ Ω−1 throughout the international delivery.

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Mäkinen, Seppo. "A Device for Measuring 3-Phase Alternating Current at a Distance". Journal of Electromagnetic Analysis and Applications 07, n.º 08 (2015): 209–16. http://dx.doi.org/10.4236/jemaa.2015.78022.

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Li, Jing-Hui. "Response of a Superconducting Quantum Interference Device to Alternating Magnetic Field". Chinese Physics Letters 31, n.º 6 (junio de 2014): 060505. http://dx.doi.org/10.1088/0256-307x/31/6/060505.

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37

Inganäs, Olle, Fengling Zhang, Kristofer Tvingstedt, Lars Mattias Andersson, Stefan Hellström y Mats R. Andersson. "Polymer Photovoltaics with Alternating Copolymer/Fullerene Blends and Novel Device Architectures". Advanced Materials 22, n.º 20 (25 de mayo de 2010): E100—E116. http://dx.doi.org/10.1002/adma.200904407.

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38

Kao, Chi-Yi, Tai-Ming Kung y Jenn-Gwo Hwu. "Impact of Oxide Charges on The Minority Carrier Response in MOS(p) Devices With Al₂O₃/SiO₂ Gate Stacks under Strong Inversion Condition". ECS Transactions 113, n.º 2 (17 de mayo de 2024): 43–49. http://dx.doi.org/10.1149/11302.0043ecst.

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In this study, a compact model proposed in the previous work (2) was utilized to elucidate an unusual minority carrier response time observed in MOS(p) devices with Al2O3/SiO2 gate stacks. It is supposed that the number of oxide charges increases with SiO2 thickness. The findings confirmed the heightened sensitivity of device alternating current (AC) characteristics to oxide charges in the outer region. Accordingly, we explored the dependencies of oxide thickness and quality on the transition frequency (ωm) of devices.

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Vescio, Basilio, Marida De Maria, Marianna Crasà, Rita Nisticò, Camilla Calomino, Federica Aracri, Aldo Quattrone y Andrea Quattrone. "Development of a New Wearable Device for the Characterization of Hand Tremor". Bioengineering 10, n.º 9 (30 de agosto de 2023): 1025. http://dx.doi.org/10.3390/bioengineering10091025.

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Rest tremor (RT) is observed in subjects with Parkinson’s disease (PD) and Essential Tremor (ET). Electromyography (EMG) studies have shown that PD subjects exhibit alternating contractions of antagonistic muscles involved in tremors, while the contraction pattern of antagonistic muscles is synchronous in ET subjects. Therefore, the RT pattern can be used as a potential biomarker for differentiating PD from ET subjects. In this study, we developed a new wearable device and method for differentiating alternating from a synchronous RT pattern using inertial data. The novelty of our approach relies on the fact that the evaluation of synchronous or alternating tremor patterns using inertial sensors has never been described so far, and current approaches to evaluate the tremor patterns are based on surface EMG, which may be difficult to carry out for non-specialized operators. This new device, named “RT-Ring”, is based on a six-axis inertial measurement unit and a Bluetooth Low-Energy microprocessor, and can be worn on a finger of the tremulous hand. A mobile app guides the operator through the whole acquisition process of inertial data from the hand with RT, and the prediction of tremor patterns is performed on a remote server through machine learning (ML) models. We used two decision tree-based algorithms, XGBoost and Random Forest, which were trained on features extracted from inertial data and achieved a classification accuracy of 92% and 89%, respectively, in differentiating alternating from synchronous tremor segments in the validation set. Finally, the classification response (alternating or synchronous RT pattern) is shown to the operator on the mobile app within a few seconds. This study is the first to demonstrate that different electromyographic tremor patterns have their counterparts in terms of rhythmic movement features, thus making inertial data suitable for predicting the muscular contraction pattern of tremors.

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40

Zhang, Hong-Su, Ling Luo, Ge Fang, Wan-Zhen Zhang, Bang-Jing Li y Sheng Zhang. "Layer-by-layer self-assembled films for building magnetically driven walking devices". J. Mater. Chem. C 2, n.º 33 (2014): 6723–26. http://dx.doi.org/10.1039/c4tc00471j.

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In this paper, we fabricated a magnetically driven walking device comprising magnetically active layer-by-layer films. By alternating the magnetic fields, the device walked steadily and fast on the substrate like an inchworm, and showed good transportation capability.

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41

Duerst, Kaitlyn Jenae, Austin William Clark, Diane Grace Brage Hudson y Leeza Ann Struwe. "Preventing Medical Device–Related Pressure Injuries Due to Noninvasive Ventilation Masks and Nasal Cannulas". Critical Care Nurse 42, n.º 5 (1 de octubre de 2022): 14–21. http://dx.doi.org/10.4037/ccn2022783.

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Background Medical device–related pressure injuries attributed to oxygen delivery devices are common yet preventable. Pressure injuries increase hospital costs, patients’ length of stay, and mortality rates. Objective To decrease medical device–related pressure injuries by transitioning patients from an over-the-nose noninvasive ventilation mask to a single-headset, interchangeable under-the-nose and over-the-nose noninvasive ventilation mask; replacing polyvinyl chloride nasal cannulas with a softer nasal cannula; and providing staff education on preventing pressure injuries related to oxygen delivery devices. Methods The project was implemented on 4 adult inpatient units with a total of 75 inpatient beds at an academic medical center. Interventions included implementing the trial noninvasive ventilation masks and nasal cannulas, alternating masks every 4 hours, relocating protective dressings, promoting the use of protective dressings for over-the-nose oral-nasal masks, and educating health care staff. Results In the 2 months before implementation (September and October 2020), 1 medical device–related pressure injury was caused by a noninvasive ventilation mask and 4 injuries were caused by nasal cannulas. During the 2 months of trial implementation (November and December 2020), no pressure injuries developed in patients using the trial devices. Discussion The interventions implemented had clinically relevant results. A larger sample size would be necessary to determine statistical significance. Postintervention data indicated a need for further education on evidence-based practice guidelines on mask alternation and use of preventive dressings to bolster compliance. Conclusion Following institutional approval, all noninvasive ventilation masks and nasal cannulas were transitioned to the trial devices at the study institution.

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Rongyan, Guo y Zhang Honghui. "Study on the Residual Current Protection Device Technology". Open Electrical & Electronic Engineering Journal 8, n.º 1 (31 de diciembre de 2014): 404–11. http://dx.doi.org/10.2174/1874129001408010404.

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As an important electrical safety protection device in low voltage distribution system, residual current protection device is to protect the insulation line leakage fault; the electric shock of the people plays an important role in fault. From the protection characteristics of residual current protective device to points, those can be divided into, residual current protection device for residual pulsating direct current and residual dc, according to the residual sinusoidal alternating current.

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Teleron, Jerry I., Jeffrey T. Leonen y Christian Louis M. Galang. "SELF-SUSTAINED POWER FOR MOBILE DEVICES: A STEPPER MOTOR-DRIVEN SOLUTION". International Journal of Engineering Science Technologies 7, n.º 3 (14 de julio de 2023): 87–97. http://dx.doi.org/10.29121/ijoest.v7.i3.2023.512.

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This study introduces a self-sustained power solution for mobile devices using a stepper motor-driven mechanism. The objective is to ensure reliable power supply during critical situations when traditional sources are unavailable. A prototype device was designed and experimentally evaluated.The device utilizes a stepper motor as a generator, converting mechanical energy into electrical energy through a hand crank. A full bridge rectifier transforms the generated alternating current into direct current compatible with mobile devices. A battery serves as the primary power storage, enabling energy accumulation.Experimental testing verified the device's performance. Mobile devices, including cellphones, laptops, and routers, were connected to assess charging capabilities. The results demonstrated successful charging, providing dependable power during outages and inaccessible charging methods.The findings establish the stepper motor-driven self-sustained power device as a practical emergency power solution. It empowers individuals to maintain communication channels and power mobile devices during critical situations, enhancing resilience. Its versatility and portability ensure effectiveness in diverse locations where conventional power sources are unreliable.In conclusion, this study presents a novel self-sustained power solution employing a stepper motor-driven mechanism. Experimental results confirm its capability to charge mobile devices, supporting communication and resilience during emergencies. The device has significant potential to benefit individuals and communities, providing reliable power and improving emergency response and communication capabilities.

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Yakovlev, Igor, Ivan Zhuravlev, Andrey Bannov, Denis Khmelyuk y Dmitry Kuzenev. "Mathematical model of operation of an induction motor with a soft-start device based on an alternating voltage regulator". Energy Systems 7, n.º 4 (20 de diciembre de 2022): 54–68. http://dx.doi.org/10.34031/es.2022.4.006.

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Induction motors are firmly entrenched in modern industry due to the unpretentiousness of operating conditions and relative low cost. Induction motors have a number of problems, one of which is high starting currents, which exceeds the nominal by 6-8 times and leads to false alarms of the automatic protection and to reduction of induction motor life. This problem is solved by installing soft-start devices in the electric circuit. The principle of operation of such devices is based on regulating the voltage supplied to the stator windings of the induction motor from 0 to the nominal value of the mains voltage. One of the possible ways to build voltage regulators is a transformer with a variable transformation coefficient. Soft-start devices, based on such an alternating voltage regulator, when regulating the voltage applied to the stator windings, allow to smoothly increase the stator current. This article presents the results of a study of the operation of an induction motor loaded on a nonlinear load, which is an induction motor, using a soft-start device based on variable voltage regulators. The principle of operation of soft-start devices based on voltage regulators is described, the main parameters and analytical dependencies of such devices are presented. A mathematical model of the operation of an induction motor with a soft-start device loaded on an induction motor is compiled. Electromagnetic processes in the environment of Matlab Simulink simulation are investigated. A comparative analysis of an induction motor operation with soft-start devices is carried out.

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Minaev, Andrey y Jury Korovkin. "Stress-strain magnetoactive propulsion system". E3S Web of Conferences 383 (2023): 01030. http://dx.doi.org/10.1051/e3sconf/202338301030.

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It is possible to create deformations in magnetically active polymeric materials by applying magnetic fields to them. This work develops a symmetrical design scheme of the device, in which the drive and control are carried out by two actuators located on opposite sides. The symmetric scheme with control from two sides allows transporting objects (cargo) in mutually opposite directions (forward and backward). It is proposed to use a magnetically active gel together with a magnetically active elastomer as magnetically active materials. The resulting force effect in the device actuator is produced by interaction of magnetic fields of electromagnets with magnetic fields of permanent magnets. Expressions for obtaining alternating magnetic fields which create conditions for generating alternating magnetic forces in the actuator of the device are given. A prototype design with a controller control device in which signals are generated for an optimum current pulse generator with adjustable duty cycle and duration is presented.

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Zhang, Andrew, Andrew Zhang, Jennifer Wang, Gabriele Seilo, Kartik Tharwani y Joseph A. Potkay. "83 Automated PDMS Engraving and Assembly of a Prototype Microfluidic Artificial Lung". Journal of Clinical and Translational Science 8, s1 (abril de 2024): 22. http://dx.doi.org/10.1017/cts.2024.83.

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OBJECTIVES/GOALS: We report an automated manufacturing system, and a series of cylindrical multi-layer microfluidic artificial lungs manufactured with the system and tested for fluidic fidelity and function. METHODS/STUDY POPULATION: A Roll-to-Roll (R2R) system to engrave multiple-layer devices was assembled. A 100 um-thick silicone sheet passes through an embedded CO2 laser engraver, which creates patterns of any geometry on the surface. The sheet is plasma-activated to create an irreversible bond, and rerolled into a processed device. Unlike typical applications of R2R, this process is synchronized to achieve consistent radial positioning. This allows the fluidics in the device to be accessed without being unwrapped. The result is a cylindrical core surrounded by many layers of microfluidic channels that can be accessed through the side of the device or through fluidic vias. This core is cut to expose the microfluidic layers, and then installed into a housing which routes the fluids into their respective microfluidic flow paths. RESULTS/ANTICIPATED RESULTS: To demonstrate the capabilities of the R2R manufacturing system, this method was used to manufacture multi-layer microfluidic artificial lungs (µALs). Gas and blood flow channels are engraved in alternating layers and routed orthogonally. The close proximity of gas and blood separated by gas-permeable PDMS permits CO2 and O2 exchange. Three µALs were successfully manufactured. Their flow paths were visualized using dyed water and checked for leaks. Then they were evaluated using water for pressure drop and CO2 gas-exchange. The top performing device had 15 alternating blood and gas layers. Test with whole blood demonstrated oxygenation from venous (70%) saturation levels to arterial (95%) saturation levels at a flow rate of 3 ml/min. DISCUSSION/SIGNIFICANCE: The ability to cost-effectively produce high surface area microfluidic devices would bring many small-scale technologies from the realm of research to clinical and commercial applications. In particular, most microfluidic artificial lungs only have small rated flows due to a lack of manufacturing processes able to create high surface area devices.

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Yang, Chao, Zeng-lin Wang, Guan-jun Wang, Qing Han y Jin Liu. "Study on corrosion characteristics of Q235 steel in seawater, soil and dry-wet alternating environments focusing on Shengli oilfield". Materials Research Express 9, n.º 4 (1 de abril de 2022): 046506. http://dx.doi.org/10.1088/2053-1591/ac61c1.

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Abstract The coastal pipelines are the key link between the offshore and the onshore pipelines, which are located in the soil dry-wet alternating environment. Even though higher corrosion risk of metals in coastal soil dry-wet alternating environment, few papers focused on this condition, while much research about ocean and atmospheric dry-wet alternating environment was paid attention to. In this paper, a self-designed soil dry-wet alternating experimental device was used to investigate the corrosion characteristics of Q235 steel in seawater, soil and dry-wet alternating environment based on mass loss experiments, corrosion morphology analysis and electrochemical experiments. The results showed that the general corrosion rate of Q235 steel in soil and seawater environments basically remained unchanged, and in dry-wet alternating environment increased with time, while the pitting rates were 0.280 mm/a (soil), 0.420 mm/a (seawater) and 0.567 mm/a (dry-wet alternation), respectively, which was caused by the oxygen concentration cell and salt concentration cell. Meanwhile, the growth rate of pitting size in dry-wet alternating environment was much higher than that in the other two environments with different corrosion characteristics of pitting corrosion (seawater and dry-wet alternation) and a changed from general corrosion to pitting corrosion (soil). In three environments, the corrosion current density (I corr) increased, in which on the 30th day of experiment, I corr = 79.72 μA cm−2 in dry-wet alternating environment, which was much higher than I corr = 47.89 μA cm−2 in seawater environment. In dry-wet alternating environment, the mass diffusion impedance at 10–2 Hz and the maximum phase angle changed significantly, while the logf-log∣Z∣ curve in low-middle frequency decreased significantly, and charge transfer resistance at 105 Hz reduced from 10.4 Ω to 4.3 Ω, illustrating an increasing corrosion rate.

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Duving, V. G., Ivan Alekseevich Kazarinov y Marina Mikhailovna Burashnikova. "A Device for Charging of a Sulfated Lead-Acid Battery by Pulse Asymmetric Current". Electrochemical Energetics 12, n.º 1 (2012): 21–24. http://dx.doi.org/10.18500/1608-4039-2012-12-1-21-24.

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The capabilities of our designed charging device for charging of lead-acid batteries with sulfated plates by pulse asymmetric current were tested experimentally. The principle of the considered charging mode is based on alternation of short high-amplitude pulses of the charging current with discharging current pulses with their sequence frequency being multiple of the alternating current frequency in Russia (50 Hz). The designed device enables effective charging of lead-acid batteries with deeply sulfated plates, and is suitable for primary battery formation of lead-acid batteries and for restoration of the initial capacity of batteries in the process of their long-term exploitation.

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Mendonça, Fábio, Sheikh Shanawaz Mostafa, Fernando Morgado-Dias y Antonio G. Ravelo-García. "A Portable Wireless Device for Cyclic Alternating Pattern Estimation from an EEG Monopolar Derivation". Entropy 21, n.º 12 (7 de diciembre de 2019): 1203. http://dx.doi.org/10.3390/e21121203.

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Quality of sleep can be assessed by analyzing the cyclic alternating pattern, a long-lasting periodic activity that is composed of two alternate electroencephalogram patterns, which is considered to be a marker of sleep instability. Experts usually score this pattern through a visual examination of each one-second epoch of an electroencephalogram signal, a repetitive and time-consuming task that is prone to errors. To address these issues, a home monitoring device was developed for automatic scoring of the cyclic alternating pattern by analyzing the signal from one electroencephalogram derivation. Three classifiers, specifically, two recurrent networks (long short-term memory and gated recurrent unit) and one one-dimension convolutional neural network, were developed and tested to determine which was more suitable for the cyclic alternating pattern phase’s classification. It was verified that the network based on the long short-term memory attained the best results with an average accuracy, sensitivity, specificity and area under the receiver operating characteristic curve of, respectively, 76%, 75%, 77% and 0.752. The classified epochs were then fed to a finite state machine to determine the cyclic alternating pattern cycles and the performance metrics were 76%, 71%, 84% and 0.778, respectively. The performance achieved is in the higher bound of the experts’ expected agreement range and considerably higher than the inter-scorer agreement of multiple experts, implying the usability of the device developed for clinical analysis.

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Castelo-Grande, Teresa, Paulo A. Augusto, Lobinho Gomes, Eduardo Calvo y Domingos Barbosa. "Portable Homemade Magnetic Hyperthermia Apparatus: Preliminary Results". Nanomaterials 14, n.º 22 (19 de noviembre de 2024): 1848. http://dx.doi.org/10.3390/nano14221848.

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This study aims to describe and evaluate the performance of a new device for magnetic hyperthermia that can produce an alternating magnetic field with adjustable frequency without the need to change capacitors from the resonant bank, as required by other commercial devices. This innovation, among others, is based on using a capacitator bank that dynamically adjusts the frequency. To validate the novel system, a series of experiments were conducted using commercial magnetic nanoparticles (MNPs) demonstrating the device’s effectiveness and allowing us to identify new challenges associated with the design of more powerful devices. A computational model was also used to validate the device and to allow us to determine the best system configuration. The results obtained are consistent with those from other studies using the same MNPs but with magnetic hyperthermia commercial equipment, confirming the good performance of the developed device (e.g., consistent SAR values between 1.37 and 10.80 W/gMNP were obtained, and experiments reaching temperatures above 43 °C were also obtained). This equipment offers additional advantages, including being economical, user-friendly, and portable.

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