Application Of Electronic System Research Articles

(Invited) Improving Withstand Voltages of Conductive Polymer Solid Aluminum Capacitors for Power Electronics Applications

Aluminum solid electrolytic capacitors using conductive polymer cathodes are promising passive components with high capacitance, low equivalent series resistance (ESR) and high thermal stability for applications in advanced power electronics systems. However, the working voltage of the aluminum solid capacitors is limited and does not meet the requirements of the power electronic systems. In this study, two approaches are introduced to increase the withstand voltage of the aluminum solid capacitors: introducing a highly resistive interface layer between a dielectric alumina layer and a conductive polymer layer and the development of novel modified PEDOT:PSS polymers.When a crystalline g’-alumina dielectric layer covered with a porous hydrated alumina layer was coated with a PEDOT:PSS conductive polymer, the breakdown voltage was ~500 V for the dielectric alumina film formed at 700 V. The dielectric breakdown occurred at voltages considerably lower than the anodizing voltage. However, the introduction of the simple hot water treatment after anodizing (post-hydration treatment) increased the breakdown voltage markedly, exceeding the anodizing voltage of 700 V.1 Cross-sectional STEM observation of the cross-section of the post-hydration treated specimen disclosed the formation of a nanovoids-dispersed layer between the dielectric layer and the hydrated alumina layer. The nanovoids-dispersed layer contained a reduced amount of polymer, so this layer is likely to be more resistive. Re-anodizing to convert the nanovoids-dispersed layer to a dielectric layer reduced the breakdown voltage to ~500 V. Thus, it is confirmed that the formation of such nanovoids-dispersed layer with high resistivity plays an important role in enhancing the breakdown voltage of the aluminum solid capacitors.Alkyl group-modified PEDOT:PSS conductive polymers were synthesized to control the crystallinity and conductivity. The crystallinity and conductivity of the PEDOT:PSS were successfully reduced by introducing the alkyl group, and we could confirm that the breakdown voltage of the capacitors was highly enhanced by using ethyl-PEDOT:PSS instead of commercial PEDOT:PSS. D. Quintero, H. Matsuya, M. Iwai, S. Kitano, K. Fushimi, H. Habazaki, ACS Appl. Mater. Interfaces, 16 (2024) 1737-1748. This study was supported in part by the MEXT-Program for Creation of Innovative Core Technology for Power Electronics (INNOPEL), Grant Number JPJ009777.

Advanced FOPoP technology in heterogeneous integration: Finite element analysis with element birth and death technique

This research investigates the advanced applications of Fan-Out Package-on-Package (FOPoP) technology within heterogeneous integration, highlighting its critical role in artificial intelligence (AI), big data analytics, and 5 G communication systems. Heterogeneous integration technology, which merges diverse components and technologies into a single package, is essential for addressing the increasing demands of modern electronic systems. However, wafer warpage during the FOPoP manufacturing process poses a significant challenge, impacting yield, chip alignment, and handling. We employ Finite Element Analysis (FEA) to tackle this issue using the element birth and death technique for process-oriented simulations. Our method innovatively utilizes both the backside and frontside Redistribution Layer (RDL) to create vertical interconnections within the FOPoP structure. The simulation process includes 11 stages: backside RDL electroplating, Polyimide (PI) curing, Molding Compound (MC) curing, frontside RDL electroplating, and PI curing. Comparing the simulated FOPoP wafer warpage values at each stage with experimental data, we consistently found discrepancies under 10 %, validating the accuracy of our simulations. Additionally, we identify effective strategies to reduce FOPoP wafer warpage through parameter analysis, such as lowering copper trace density in the RDL and increasing the die area ratio, thereby improving manufacturing yield. This research advances the understanding of FOPoP technology in heterogeneous integration and provides a robust framework for its application in next-generation electronic systems.

A Novel Capacitance Estimation Method of Modular Multilevel Converters for Motor Drives Using Recurrent Neural Networks with Long Short-Term Memory

Accurate estimation of submodule capacitance in modular multilevel converters (MMCs) is essential for optimal performance and reliability, particularly in motor drive applications such as permanent magnet synchronous motor (PMSM) drives. This paper presents a novel approach utilizing recurrent neural networks with long short-term memory (RNN–LSTM) to precisely estimate capacitance in MMC-based PMSM drives. By leveraging simulation data from MATLAB, the LSTM neural network is trained to predict capacitance based on voltage, current, and their temporal variations. The proposed LSTM architecture effectively captures the dynamic behavior of MMCs in PMSM drives, providing high-precision capacitance estimates. The results demonstrate significant improvements in estimation accuracy, validated through mean squared error (MSE) metrics and comparative analysis of actual versus estimated capacitance. The method’s robustness is further confirmed under varying operating conditions, highlighting its practical utility for real-time applications in power electronic systems.

Pd-W18O49 Nanowire MEMS Gas Sensor for Ultraselective Dual Detection of Hydrogen and Ammonia.

Demand for real-time detection of hydrogen and ammonia, clean energy carriers, in a sensitive and selective manner, is growing rapidly for energy, industrial, and medical applications. Nevertheless, their selective detection still remains a challenge and requires the utilization of diverse sensors, hampering the miniaturization of sensor modules. Herein, a practical approach via material design and facile temperature modulation for dual selectivity is proposed. A Pd nanoparticles-decorated W18O49 nanowire gas sensor is prepared for dual detection of hydrogen and ammonia. The sensor exhibits distinct operating temperatures for ultraselective detection of hydrogen (125°C) and ammonia (225°C), with high responses of 35.3 and 133.8, respectively. This dual selectivity with high sensitivity is attributed to enhanced oxygen adsorption, the chemical affinity of sensing materials for target gases, and distinct reactivity profiles of gases. The proposed sensor is further integrated into a microelectromechanical system, enabling its small size, low power consumption, and rapid temperature modulation. Moreover, the practical feasibility of this sensor platform for smart energy monitoring systems is demonstrated by assessing its sensing properties in electrochemical ammonia oxidation reaction systems. This work can provide a practical approach for developing a single gas sensor with multiple functionalities for application in electronic nose systems.

Influence of processing method on the conductive properties of nanocomposite films based on nanocellulose and graphene nanoplatelets

The need for improvements in electronic devices has been generating important demands in the technical-scientific area. Thus, including in these devices natural materials, which present desirable performance and are sustainably obtained from renewable sources, becomes an interesting option. Nanocellulose and graphene-based films have been researched for some years seeking to achieve special electrical properties. However, the production method of these films directly influences their electrical properties. In this context, this work proposes to explore the conductive and morphological properties of nanocellulose films combined with graphene nanoplatelets (GNP), produced by two different methods (casting and dip coating). For this, the nanocelluloses were obtained through the milling process in a defibrillator stone mill of eucalyptus cellulose bleached in distilled water. The casting films were produced from the incorporation of GNP directly into the nanocellulose suspension; while the dip coating films were produced from the immersion (5–10 layers) of dry nanocellulose films in a solution containing GNP. In this way, it was sought to compare the nanoplatelets embedded (casting method) within the film to those applied on the external surface of the film (dip coating method). The volumetric conductivity was measured (ASTM D257-07 standard) and the surface conductivity (4-point device) of the films produced. The results showed that all films containing GNP had higher conductivities than pure nanocellulose films. However, casting films, despite having a higher GNP concentration, presented lower volumetric and surface conductivity values when compared to dip coating films. In addition, reassess after 1 year, the dip coating films showed an insignificant decrease in conductivity values, indicating a longer useful life. However, the casting films show about 50% decrease in conductivity. Thus, it was concluded that the presence of GNP only in the outer layer of nanocellulose films is more efficient for potential application in electronic systems.

Implementation of Blockchain Technology in the Development of a Mobile-Based E-Career System

In the current digital era, Blockchain technology has shown great potential across various sectors, including education and career development. However, its application in electronic career systems or E-Career is still rare. This creates an urgency to conduct research on how Blockchain technology can be applied in E-Career systems to enhance efficiency, transparency, and security in the career search process for students. This study aims to implement Blockchain technology in the development of an E-Career system at Politeknik LP3I Medan, based on a mobile application. One sector that can benefit from Blockchain technology is the electronic career system or E-Career. This system aims to facilitate career searches for students in a more efficient and transparent manner. However, the challenge in implementing this system lies in ensuring that data shared between different parties is secure and immutable. The main goal is to create a system that is not only efficient but also secure and transparent. Thus, students can search for careers in a more efficient and transparent way, while companies can more easily find the right candidates. Additionally, this research also aims to identify and address the challenges in integrating Blockchain technology with mobile applications.

Integration of a Paper‐Based Supercapacitor and Flexible Perovskite Mini‐Module: Toward Self‐Powered Portable and Wearable Electronics

AbstractAn all‐flexible self‐powering unit, combining a flexible perovskite solar mini‐module for energy conversion and ultra‐flexible screen‐printed interdigitated carbon supercapacitors on paper for energy storage, is designed and developed. Through a hybrid bifurcated structure, the supercapacitors are connected in series and neatly layered on a paper substrate with the perovskite solar mini‐module strategically placed on top for seamless integration. The photosupercapacitor quickly reaches saturated voltage under various light intensities (1 sun, 1000 lx, 500 lx, and 200 lx) and displays a self‐discharge time of over 2 minutes. It delivers peak overall and storage efficiencies of 2.8% and 23%, respectively, and exhibits an extensive potential window of 3.8 V, making it a prominent choice for real time applications in electronic systems. In a nutshell, the inherent flexibility of both the solar module and the storage system, coupled with the space‐saving design, and the extensive potential window of the hybrid photosupercapacitor paves the way for implementation in portable and wearable electronics operating in indoor environments, ushering a new era of more versatile and adaptable energy solutions.

Evaluating the Role of Electronic Security Surveillance in Enhancing Safety in Secondary Schools: A Case Study of Trans Nzoia County, Kenya

Secondary school safety is critical to sustaining comparable academic performance outcomes. However, there are so many threats that affect the safety of schools that make up this necessity throughout the world. Security challenges in secondary schools in Kenya includes fires, theft and radicalization have been witnessed in school. Nevertheless, the application of electronic security surveillance systems still remains rather low. They work under very high risks and many schools in Trans Nzoia County are especially vulnerable leaving the school community at risk. This research aimed at evaluating the extent to which these systems enhance safety. Based on Situational Crime Prevention Theory and Contingency Theory, the study adopted descriptive survey research design and targeted 14 second schools with previous security threats and deployed with surveillance systems. Participants were 14 principals, 14 boarding teachers, 14 security personnel, 70 students- 10 students from each of the 7 schools, County Director of Education, and the Chief Fire Officer. The sample size for the study was 128 respondents. Data was collected using questionnaires, interview schedules and Focus Group Discussions. The data was analysed through using Social Package for Social Sciences version 25. Regarding electronic surveillance system improvement of school security, 80.8 percent of respondents supported its effectiveness. When national ICT and school safety policies had been included, it was found that the improvement of these systems for the safety of schools has proved 40.9% different (R² = 0.409, F (2, 75) = 26.003, p = 0.000). Of all the forms of surveillance, the study noted that CCTV cameras were the most widely used in secondary schools. That being said, the efficiency of their use in achieving safety objectives was somewhat hampered by operational obstacles. The study therefore suggests that while emphasizing on the use of additional technologies like fire alarms, burglar alarms, Metal detectors and Biometric systems, the school management boards in collaboration with Ministry of education and ICT should devise way of extending the use of such gadgets. Secondly, to guarantee full coverage of the school premises, it is necessary to step up investment in electronic security systems, and improve the support of personnel pertaining to the detection of threats.

Effect of the Application of Electronic Learning System on Learning Effectiveness Amidst Coronavirus Pandemic at University of Rwanda

Effect of the Application of Electronic Learning System on Learning Effectiveness Amidst Coronavirus Pandemic at University of Rwanda

Investigation of Electric Field Tunable Optical and Electrical Characteristics of Zigzag and Armchair Graphene Nanoribbons: An Ab Initio Approach.

Graphene nanoribbons (GNRs), categorized into zigzag and armchair types, hold significant promise in electronics due to their unique properties. In this study, optical properties of zigzag and armchair GNRs are investigated using density functional theory (DFT) in conjunction with Kubo-Greenwood formalism. Our findings reveal that optical characteristics of both GNR types can be extensively modulated through the application of a transverse electric field, e.g., the refractive index of the a zigzag GNR is shown to vary in the range of n = 0.3 and n = 9.9 for the transverse electric field values between 0 V/Å and 10 V/Å. Additionally, electrical transmission spectra and the electrical conductivities of the GNRs are studied using DFT combined with non-equilibrium Green's function formalism, again uncovering a strong dependence on the transverse electric field. For example, the conductance of the armchair GNR is shown to vary in the range of G = 6 μA/V and G = 201 μA/V by the transverse electric field. These results demonstrate the potential of GNRs for use in electronically controlled optoelectronic devices, promising a broad range of applications in advanced electronic systems.

КОМПЕТЕНТНОСТІ ПЕДАГОГІЧНИХ ПРАЦІВНИКІВ У СФЕРІ ЕЛЕКТРОННИХ СИСТЕМ САМООЦІНЮВАННЯ ПРОФЕСІЙНОЇ ДІЯЛЬНОСТІ

Relevance. The importance of implementing electronic self-assessment systems for pedagogical staff’s professional activities is described. It is emphasized that contemporary educational reforms require objective and transparent assessment mechanisms. It is determined that the implementation of such systems enhances the quality of the educational process. The development of digital and analytical competencies in educators for effective use of these systems is highlighted as necessary. Objective: The article aims to substantiate the competencies of pedagogical workers in the field of electronic self-assessment systems for professional activity. Methods: Surveys were used to assess educators' perception and application of electronic systems in professional activities; interviews aimed at gaining deeper insights into individual experiences with these systems; document/literature analysis covered curricula, methodological recommendations, reports, articles on professional tasks, and other documents related to educators' professional activities; observations focused on how teachers use electronic assessment systems in their daily professional activities and its impact on their interactions with students. Results: The research indicates that the implementation of electronic self-assessment systems in the context of educational reforms is a positive step. It was found that these systems enhance objectivity, transparency, and efficiency of assessments, developing key competencies in educators: informational-digital, evaluative-analytical, innovative, and reflective. The significance of continuous learning to adapt to technological changes is noted. It was observed that educators actively utilize digital tools such as online learning, video conferencing, Google Forms, and Padlet. Artificial intelligence, although slowly introduced, holds significant potential for personalizing education. Conclusions: The study underscores the importance of electronic self-assessment systems for improving education quality. The development of key competencies in educators—informational-digital, evaluative-analytical, innovative, and reflective – is crucial for the effective use of these systems. These competencies enable objective assessment of learning outcomes, adaptation of educational strategies, and enhancement of assessment transparency, which positively impacts the quality of the educational process. Continuous professional development ensures educators' ability to adapt to technological changes and implement new teaching approaches. Electronic systems encourage reflection and professional growth, enhancing educators' proficiency and creating a modern, interactive educational environment suited to the demands of the digital era.

Analysing the surface morphology of annealed FTO/ZnS bilayer films: stereometric, fractal, and wettability approaches

The surface micromorphology and roughening of the thermal evaporation-coated FTO/ZnS bilayer thin films annealed at 300, 400, 500, and 550∘C\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$550\\,^\\circ{\ ext{C}}$$\\end{document} for 1 h have been studied. AFM images of the prepared samples were analysed by the MountainsMap software, and the effects of the annealing temperature on the surface texture of the FTO/ZnS thin film’s surface were investigated. Stereometric and advanced fractal analyses showed that the sample annealed at 500∘C\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$500\\,^\\circ{\ ext{C}}$$\\end{document} exhibited greater surface roughness and greater skewness and kurtosis. This film also has the most isotropic surface and exhibits the highest degree of heterogeneity. Also, despite the decrease in surface roughness with increasing temperature from 500 to 550∘C\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$550 \\,^\\circ{\ ext{C}}$$\\end{document}, the fractal dimension tends to increase. The static water contact angle measurements indicate that the film annealed at 500∘C\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$500 \\,^\\circ{\ ext{C}}$$\\end{document} exhibits higher hydrophobicity, which can be attributed to its greater topographic roughness. Our research indicates that the surface morphology of FTO/ZnS bilayer thin films is influenced by the annealing temperature. Changing factors such as roughness, fractality, and wettability parameters to help improve surface performance make the FTO/ZnS bilayer suitable for application in electronic and solar systems.

Precision refined: Integrating micromachining constraints for enhanced product accuracy through topology optimization

The deviation of micromachined products from their intended design poses a significant challenge for designers. To address this issue, numerical simulations can be employed for predicting such deviations. In this research paper, we present a methodology aimed at preserving accuracy in micromachining products resulting from topology optimization, particularly when intricate geometric features are involved. The accuracy of final products can be difficult to achieve due to the inherent limitations of microfabrication processes, specifically in lithography and etching. To overcome these limitations, our proposed methodology combines density filters and morphological operators to generate lithography masks that closely align with the surface of micromachined silicon. We have validated the efficacy of this methodology by selecting a benchmark problem focused on maximizing the stiffness of a cantilever beam across various volume fractions. The results demonstrate a significant improvement in accuracy while maintaining adherence to the desired design specifications. Additionally, we have conducted simulations of surface micromachining with photolithography to further substantiate the effectiveness of our proposed method in achieving enhanced accuracy for optimized topological structures. These findings hold practical implications for the design of Micro Electronic Mechanical Systems (MEMS) and other similar applications where accuracy is of paramount importance. By providing a means to compensate for the limitations inherent in microfabrication processes, our proposed methodology can contribute to the production of highly accurate and topologically optimized products.

Research on the Expansion Application of Electronic Toll Collection System

Electronic Toll Collection (ETC) system is an important part of modern intelligent transport system, which plays an important role in intelligent car parks and congestion charging. Electronic Toll Collection (ETC) system includes automatic vehicle identification system and electronic billing system. The automatic vehicle identification system includes three parts: automatic vehicle identification (AVI), automatic vehicle model identification (AVC) and inspection system (ES).The application of ETC in intelligent car parks and congestion charging also includes automatic vehicle identification system (automatic vehicle identification, automatic vehicle model identification and inspection system) and electronic billing system. In intelligent car parks, ETC technology achieves fast and accurate automatic toll payment by automatically identifying the ETC tags carried by vehicles, which greatly improves the efficiency of car parks and reduces the queuing and waiting time due to manual toll collection. In terms of congestion charging, ETC technology provides an effective means to implement congestion charge collection. By setting up ETC toll lanes in core urban areas or busy road sections, the system can automatically record the information of the vehicles passing through and carry out toll settlement, thus realising dynamic toll collection according to the degree of congestion and the frequency of vehicle use. This congestion charging strategy aims to regulate urban traffic flow through economic means, alleviate traffic congestion and promote the sustainable development of urban transport. Although China's theoretical research on congestion charging, has been relatively mature, but affected by a variety of factors, no city has yet to start the implementation of congestion charging, the lack of experience in practice. Singapore will not stop the car charging system (ETC) technology successfully applied to urban congestion charging and intelligent car parks, ETC system in intelligent car parks and congestion charging application, help to promote the development of urban transport to a more intelligent, green direction. China can learn from the successful experience of foreign countries and apply it to its own intelligent car parks and congestion charging. This paper introduces the basic principle of ETC, discusses the research progress of ETC in terms of technical characteristics, and analyses the application scenarios of ETC in intelligent car parks and congestion charging. By examining the opportunities offered by Electronic Toll Collection (ETC) systems in smart car parks and congestion pricing, this study aims to delve into the transformative impacts of Electronic Toll Collection (ETC) systems on intelligent mobility and contribute to the sustainable development of intelligent mobility.

Electronic Technologies for Quality Control in the Biscuit Manufacturing Process

By 2030, the biscuit industry may go global due to advancements in electronic tools like eNose, eTongue, and eVision. This shift is governed by precision, productiveness, and regulatory compliance. Ultimately, the automation increase is driven by this consequence. This article will critically look at the issues and benefits arising within the biscuit production field after the shift towards the use of electronic control systems. It analyses the present situation and figures out the ineffectiveness on the part of conventional tools in solving the problem as it currently exists and shows how electronic instruments can be better in aiding visual and sensory inspections. While there have been remarkable achievements, these are persisting, of course, and they include high investment costs, specific skills requirements, and less flexibility when adapting to different production conditions. Without thorough research and development, the challenges in the production of the electronic control systems will still stand and no technology will be created to resolve the problems of the system. This study further reaffirms the need for the invention of modern and improved quality control processes for biscuit manufacturing plants. Through identifying previous methods and approaches and, the advantageous features of each, as well as highlighting shortcomings of current quality control strategies, this paper serves as an effective driving force for the future evolution and further improvement of quality control practices during biscuit production. Comprehensive product evaluation is attended to by employed approaches that analyse future benefits and opportunities as well as drawbacks and risks of the application of electronic quality control systems in the biscuit industry.

The Influence of Selected Factors on Changes in Locomotion Activity during Estrus in Dairy Cows.

The objective of this study was the evaluation of the locomotion activity of heifers and Holstein dairy cows during estrus. We have analyzed the locomotion activity using the Heatime RuminAct device on 180 cows (32 heifers and 148 dairy cows) and we evaluated a total of 633 estrus cycles during the reference period of 3 days before estrus, 3 days after estrus, and on the day ofestrus occurrence. The datawere analyzed using the DataFlowTM II program. The locomotion of cows was expressed in the units of locomotion activity in 24 h (u.24 h-1). During the reference period of 3 days before estrus, the cows showed locomotion activity of 558 u.24 h-1, with an increase in locomotion activity on the day of estrus of 836 u.24 h-1, and, during the reference period of 3 days after estrus, the level of locomotion activity decreased to 537 836 u.24 h-1, which is a similar level of locomotion activity to the reference period before estrus. Through the statistical analysis, we evaluated the impact of parity, lactation stage, milk yield, and individuality on changes in locomotion activity during estrus and throughout the reference period, and we found a significant effect of parity (F = 13.41, p < 0.001) on changes in the locomotion activity of dairy cows during estrus. Based on these results, this research offers fresh perspectives on assessing specific factors affecting the locomotion activity of dairy cows during estrus through the practical application of electronic systems for estrus detection on dairy farms.

Excellent energy storage properties and multi-scale regulation mechanism of Sr(Zr0.5Ti0.5)O3-(Na0.5Bi0.5)0.94Ba0.06TiO3 ceramics

With the rapid advancement of energy storage technologies, dielectric capacitor materials with the outstanding recoverable energy density and power density have garnered significant attention from researchers in the past decades. In this study, (1-x) (Na0.5Bi0.5)0.94Ba0.06TiO3-xSr(Zr0.5Ti0.5)O3 ceramics were prepared via a solid-state reaction method, and the impact of composition on their structure, energy storage performance and stability were investigated. The results revealed that the introduction of Sr(Zr0.5Ti0.5)O3 induced the ferroelectric-relaxor transformation of (Na0.5Bi0.5)0.94Ba0.06TiO3 ceramics, leading to the destruction of the long-range ferroelectric order and the formation of polar nanoregions. In addition, the 0.7(Na0.5Bi0.5)0.94Ba0.06TiO3–0.3Sr(Zr0.5Ti0.5)O3 ceramic exhibited the optimal comprehensive energy storage performance: its recoverable energy storage Wrec attained 8.19 J/cm3 at 650 kV/cm, while the energy storage efficiency η was 85.6 %. Meanwhile, it displayed exceptionally high power density (315.7 MW/cm3) and charge-discharge rate (t0.9 = 50.4 ns). Moreover, this ceramic demonstrated the impressive energy storage performance, in particular, good temperature stability across a wide range of temperatures (20–140 °C), frequency stability (1–200 Hz), and fatigue resistance (1–106 cycles). Finite element analysis showed an enhancement in the breakdown field strength of the ceramics was attributed to the reduction in grain size. First-principles calculations revealed that the band gap increased after adding Sr and Zr elements, and the interactions between the states of O 2p and Ti 3d, Zr 3d, Bi 6p may serve as the microscopic origin of electron energy level polarization and enhanced dielectric performance. Thus, the ceramics have great potential for the application in high-power pulsed electronic systems.

An experimental evaluation of the performance of a remote 2U loop thermosyphon

In recent years, the increasing application and diversity of electronic systems have resulted in a significant demand for research and development in electronic cooling. Designing and evaluating thermal modules is crucial, especially for systems generating high heat flux levels. This study proposes a novel remote loop thermosyphons (RLTS) for high heat flux applications and cooling 2U servers, which has been assessed experimentally. Additionally, several critical factors are examined, including the filling ratio (FR), air flow rate, and heat load. The experimental study evaluated air flow rates range from 130 to 170 cubic feet per minute (CFM), and the filling ratios span from 40 % to 70 %. The heat load varied from 100 W to 700 W. Compared to the conventional loop thermosyphon, the remote loop thermosyphon exhibited superior performance and sustained higher heat flux. Specifically, this thermal module can effectively manage 640 W at an inlet air temperature of 28 °C with an airflow rate of 170 CFM. Moreover, compared to other available loop thermosyphons, the proposed thermal module demonstrated enhanced heat flux up to 94 W/cm2. These results suggest that the new remote loop thermosyphon is a promising solution for cooling high heat flux applications, such as 2U servers. Furthermore, among all the investigated FR effects the 50 % FR performed better than the other filling ratios. At this filling ratio, the thermal resistance reached a minimum value of 0.078 K/W. The findings indicated that increasing the heat load decreased thermal resistance to a certain threshold, beyond which thermal resistance started to increase. This increase in thermal resistance was caused by restricted space above the evaporator. The confined space effect in a loop thermosyphon system significantly influences the performance and should be considered as a crucial factor in future design endeavors.

Photoresponsive Janus microfibers array film with tunable electrical anisotropy

A new kind of photoresponsive film is produced by integrating photoconductive material into the type-II anisotropic conductive film. This film consists of orderly arranged Janus microfibers, with each Janus microfiber is comprised of a conductive region and an insulating region. Copper phthalocyanine, as the photoconductive material, is introduced into the conductive regions of these Janus microfibers, and thus the electrical conduction of the conductive regions can be enhanced by applying appropriate external light irradiation, while the insulating regions are basically unaffected. Based on this property, the electrical conduction along with the length direction of the Janus microfibers in the film is adjustable by light, the perpendicular direction along the film surface remains constantly insulating, and thus the electrical anisotropy of the resulting Janus microfibers array film can be tuned under light irradiation. The products have potential applications in flexible electronic devices and control systems.

Online Voting System using Blockchain

Blockchain technology has been presented as a support for trust needs between transactions in electronic information systems. Its successful use in cryptocurrencies has allowed it to explore its capabilities in commercial, industrial, and service systems, backed by the operational alternatives offered by Ethereum Smart Contracts and the cryptographic security of public and private key. These keys are used as a way to make online transactions anonymously, with the guarantee offered by the Blockchain network that they are executed safely. With the above in mind, this concept can be extended to the electoral processes, thus allowing its application in electronic voting systems, especially when the protocols currently used lack the trust factor between the different social actors. This document presents a proof of concept in which Blockchain and other technologies are applied, to allow interaction as an electronic voting system for the election of unique candidates. This has been achieved through the specification of an architecture designed especially for electoral processes, from which it is implemented and a simulation is carried out in order to obtain data that generates value, when evaluating Blockchain technology as an alternative to current voting systems