Electronic Devices Research Articles

A Critical Examination of the E-Taxation, Improvement in Tax Compliance and Revenue Collection of Economic Development in Nigeria: An Examination covering 2008 to 2023.

This study looked into the topic of e-taxation and enhanced tax compliance in Nigeria. The study aimed to achieve two particular goals. It investigated the impact of e-taxation on tax evasion in Nigeria, as well as the extent to which e-taxation has contributed to the reduction of tax avoidance in Nigeria. The study's analysis used secondary quantitative data from the Federal Inland Revenue Services (FIRS) and the National Bureau of Statistics (NBS). The study found that e-taxation had a considerable beneficial impact on tax evasion in Nigeria. The study found that the mean value of tax revenue increased after the implementation of e-taxation when compared to the mean value before the adoption of the e-taxation system. It also indicated that e-taxation has greatly helped in curbing the issue of tax evasion in Nigeria. The data analysis revealed a greater mean value for tax revenue following the implementation of e-taxation as compared to the mean value before the e-taxation system. The report provided numerous important recommendations, including the necessity for FIRS to develop an electronic tax payment system mobile App that will raise awareness and simplify the country's e-tax system. This study concluded that the e-taxation system in Nigeria achieves higher tax compliance than the manual approach.

PENGEMBANGAN SISTEM FRONT END PADA PMTCINVENTORY BERBASIS MOBILE MENGGUNAKAN METODE WATERFALL

The company inventory is one of the important aspects that receives primary attention in a company. Generally, companies with a vast and diverse inventory cater to clients and local employees. Therefore, company inventory becomes a primary concern for various businesses. However, in some companies, inventory tracking still relies on software such as Microsoft Word and Microsoft Excel. This makes the recording and management of company inventory less efficient. Based on this issue, it is concluded that companies need an electronic inventory system or e-inventory. Hence, the development of a mobile-based inventory system is undertaken. This development utilizes the Waterfall method and the Flutter framework. The stages in the Waterfall method include requirements, design, implementation, testing, and maintenance. The advantage of using this method is that the work is carried out gradually and systematically. The results of the research conducted using the Waterfall method include the creation of five pages or user interfaces: Dashboard, Login, Home, Saya, and Detail Alat. Each page has different functionalities. The user interface is created using the Flutter framework and tested using the black box testing method, resulting in alignment between user preferences and the application created.

Fractal Engineering Integration in Antenna Arrays: A Comparative-review for Advanced Transceiver Systems with 5G/IoT Connectivity

The growing demand for space-efficient antennas compatible with portable electronic gadgets inspired the integration of recursively iterated fractal geometries (characterized by self-similarity, space-filling, and multiband/wideband capabilities) in antenna designs. Therefore, this article conducts an extensive survey on fractal-based single-port and multi-port patch antenna designs with multiband and ultrawideband characteristics for their implementation in 5G/IoT (Internet of Things) devices. The survey begins with a basic overview of fractal geometries and the iterated function system (IFS) technique employed for their generation. Further, it highlights the limitation of multipath fading prevalent in single-port antenna arrays that can be overcome by adopting multiple-input multiple-output (MIMO) technology. The MIMO antenna systems are vital for 5G networks to enhance data transmission rate, network capacity, and system reliability. Apart from these admirable attributes, the closely packed antenna elements in the MIMO configuration result in a severe mutual coupling. To address this limitation, various isolation enhancement techniques developed by distinguished researchers are thoroughly discussed in this article, detailing their merits and demerits. At last, this article portrays diverse band-notch structures integrated into the antenna designs to eradicate the existing interfering narrow bands in the ultrawideband (UWB) spectrum. The underlying reason for conducting this survey is to aid antenna designers and academicians with a thorough knowledge of distinct fractal geometries, various isolation improvement approaches, and band-notch techniques on a single platform, desired for designing 5G/IoT-based antenna systems.

Impurities in 4H silicon carbide: Site preference, lattice distortion, solubility, and charge transition levels

4H Silicon carbide (SiC) is widely recognized as one of the most advanced wide bandgap semiconductors used in the production of high-efficiency power electronic devices. Impurities play a crucial role in achieving the desired electrical properties in 4H-SiC, yet the understanding of impurities in this material remains limited. In this study, first-principles formation-energy calculations were employed to establish a comprehensive database of formation-energy diagrams for impurities in 4H-SiC. This database includes valuable information on site preference, lattice distortion, solubility, and charge transition levels (CTLs) of the impurities. The site preference for each impurity is closely related to factors such as the Fermi energy, chemical potential, and the impurity species itself. To assess the lattice distortion caused by each impurity, a comparison was made between the volume changes before and after doping. Moreover, the solubility of each impurity was determined using the detailed balance theory, thereby enabling a direct measure of the maximum impurity concentration achievable in the material. Based on the CTLs, the impurities in 4H-SiC were classified into four categories: n-type impurities, p-type impurities, amphoteric impurities, and non-electroactive impurities. This comprehensive property database for impurities in 4H-SiC provides valuable insights for tailoring the material properties through controlled doping, thereby ultimately leading to enhanced performance of power electronic devices.

Challenges in the Synthesis and Processing of Hydrosilanes as Precursors for Silicon Deposition.

Liquid hydrosilanes are required for the production of silicon films. The silicon layers can be processed for electronic devices like transistors or thin-film solar cells. Hydrosilanes are highly reactive and pyrophoric. Therefore, the synthesis of these compounds is challenging and dangerous. The available synthesis methods for hydrosilanes are reviewed and compared. Hydrosilanes are highly attractive compounds, which can be processed as liquids with printing technology to amorphous silicon films on nearly any solid substrate. The silicon layers can be processed for electronic devices like transistors or thin-film solar cells. The endothermic character of hydrosilanes with their positive enthalpies of formation results in favorable properties for processing. The larger the molecules, the lower their decomposition temperature and the higher their photoactivity. Cyclic hydrosilanes such as cyclopentasilane and cyclohexasilane can be easily deposited. The branched neopentasilane is more difficult to deposit but yields better-quality films after processing. The key challenge is the complex synthesis of the precursors and the hydrosilanes. The available preparative methods are presented in this review and their advantages and disadvantages are evaluated. The following synthesis methods are presented and discussed in this article: Wurtz coupling and other reductive coupling processes, dehydrogenative coupling of silanes, plasma synthesis of chlorinated polysilanes, amine- or chloride-induced disproportionations, and transformation of monosilane to higher silanes. Plasma synthesis is already carried out today as a continuous industrial process. The most effective synthesis methods in the laboratory are currently amine- and chloride-induced disproportionations. There is a great need to further optimize the syntheses of hydrosilanes and to develop new simple synthesis variants.

Design of Reversible Serial Adder Based on EPOE Expressions for Computational Applications

Considering the growing trend toward reducing the size of electronic devices, reducing power consumption has become one of the major concerns of circuit designers. One of the solutions to reduce power consumption is the design of reversible circuits. This paper proposed the design of a low-cost self-control serial adder system. In the proposed circuit, EPOE expressions have been used for the direct and compact design of sequential circuits to reduce the fixed inputs of sequential logic circuits. In addition, to reduce the quantum cost, common terms between the outputs are optimally used. Also, limiting the use of Tofoli gates with a size larger than three inputs in the implementation of the final circuit will reduce the quantum cost of the resulting circuit. The results and comparisons showed that the proposed design has improved efficiency measures including quantum cost, garbage outputs, and fixed inputs compared to existing works.

Hydrophobic deep eutectic solvent-based vortex-assisted dispersive liquid–liquid microextraction with UV–visible spectrophotometry for copper determination in waste printed circuit boards

ABSTRACT Nearly all electronic devices utilise Printed Circuit Boards (PCBs), which contribute significantly to the generation of electronic waste (e-waste). They are rich in metal content, with copper being present in higher percentages. In this work, a simple, efficient and environment-friendly pre-concentration technique was developed, using hydrophobic deep eutectic solvent as an extractant in vortex-assisted dispersive liquid–liquid microextraction. This pre-concentration technique is coupled with spectrophotometry for the determination of copper in PCBs. The complexing agent, sodium diethyl di-thiocarbamate (DDTC), and copper formed a complex in the 2–3 pH range. The Cu-DDTC complex was vortexed for 1 min at 2800 rpm to extract in hydrophobic DES. The sediment was analysed using a UV–Visible spectrophotometer at λ max 435 nm. The optimisation parameters, including pH, extraction solvent selection and its volume, concentration and volume of chelating agent, interference of forein ios, etc., have been assessed. Analytical figures of merit such as limit of detection (1.98 μg/L), limit of quantification (5.9 μg/L), relative standard deviation (3.4%) and enrichment factor (10) have been obtained under optimal experimental conditions. The method was validated by a certified copper solution and applied successfully to determine copper in waste PCBs of personal computers.

Interfacial Optimization for AlN/Diamond Heterostructures via Machine Learning Potential Molecular Dynamics Investigation of the Mechanical Properties.

AlN/diamond heterostructures hold tremendous promise for the development of next-generation high-power electronic devices due to their ultrawide band gaps and other exceptional properties. However, the poor adhesion at the AlN/diamond interface is a significant challenge that will lead to film delamination and device performance degradation. In this study, the uniaxial tensile failure of the AlN/diamond heterogeneous interfaces was investigated by molecular dynamics simulations based on a neuroevolutionary machine learning potential (NEP) model. The interatomic interactions can be successfully described by trained NEP, the reliability of which has been demonstrated by the prediction of the cleavage planes of AlN and diamond. It can be revealed that the annealing treatment can reduce the total potential energy by enhancing the binding of the C and N atoms at interfaces. The strain engineering of AlN also has an important impact on the mechanical properties of the interface. Furthermore, the influence of the surface roughness and interfacial nanostructures on the AlN/diamond heterostructures has been considered. It can be indicated that the combination of surface roughness reduction, AlN strain engineering, and annealing treatment can effectively result in superior and more stable interfacial mechanical properties, which can provide a promising solution to the optimization of mechanical properties, of ultrawide band gap semiconductor heterostructures.

In Situ Synthesis of Liquid Metal Conductive Fibers toward Smart Cloth.

To meet the diverse needs of humans, smart cloth has become a potential research hotspot to replace traditional cloth. However, it is challenging to manufacture a flexible fabric with multiple functions. Here, we introduce a smart cloth based on liquid metal (LM) conductive fibers. Ga2O3 nanoparticles are obtained through ultrasonic pretreatment. Furthermore, a coordination bond is formed between thiol groups on the surface of protein fibers and Ga2O3 through a scraping method, allowing Ga2O3 particles to be grafted onto the surface of protein fibers in situ. Finally, LM conductive fibers are encapsulated using a photocuring adhesive. In addition, a wearable smart cloth integrated with multiple sensors has been developed based on LM conductive fibers. Users can not only monitor their movement trajectory and the surrounding environment in real time but also have their data supervised by family members through a client, achieving remote and continuous monitoring. The development of this wearable smart cloth provides strong support for future wearable, flexible electronic devices.

Does Age Play a Role in Patients with Heart Failure Receiving Cardiac Implantable Electronic Devices?

Does Age Play a Role in Patients with Heart Failure Receiving Cardiac Implantable Electronic Devices?

Enhanced electromagnetic wave absorption in ultrathin cement-based composites with integrated multi-dimensional carbon materials

The challenges posed by electromagnetic waves (EMW) cause significant interference in electronic device operation, jeopardizing information security and disturbing normal biological functions, which necessitate attention. Multi-scale carbon/cement-based composites were developed for EMW absorption by integrating multi-dimensional carbon materials, including carbon nanotubes (1D), graphene (2D), and modified carbon microspheres (3D). These composites demonstrate exceptional EMW absorption capabilities, with a minimum reflection loss (RLmin) of −44.32 dB and an effective absorption bandwidth (EAB) of 3.644 GHz at X band, merely having a thickness of 1.90 mm. Furthermore, the superior EMW absorption properties of these composites are confirmed through radar cross-section (RCS) simulation and electric field distribution analysis. A small house is constructed of designed three-layer multi-scale carbon/cement-based composites in which the actual EMW reflection losses are less than –10 dB within the whole test frequency range, and these composites can effectively obstruct 5 G mobile phone signals. Therefore, multi-scale carbon/cement-based composites could be promising candidates for effectively solving the increasingly serious problem of electromagnetic radiation pollution.

Heat Flow Overshooting in Suspended Graphene

ABSTRACT In this work we found that when the hydrodynamic heat conduction in suspended graphene is in the under-damped free oscillation regime the disturbance of heat flux at the boundaries of graphene and the joint action of the initial heat flux and its time change rate can cause the heat flow overshooting which refers to the excess heat flux established in the heat conduction medium when two heat flow wave-fronts meet. The overshooting can make the maximum amplitude of the heat flux more than twice that of the initial heat flux, which poses a great danger to the next high-frequency and high-efficiency electronic devices based on graphene, such as the graphene field-effect transistors. Interestingly, results show that when the scale ratio of graphene with rectangular shape in the heat flow direction to its vertical direction is greater than a certain value, the overshooting caused by the disturbance of the heat flux at the boundaries no longer occurs. For the overshooting induced by the uneven distribution of the initial heat flux and its time change rate, it is shown that if the length in the region with the higher heat flux and time change rate in the direction of heat flow is less than a critical value the overshooting phenomenon can be avoided. These findings provide a new way for thermal management of electronic devices based on graphene.

Assessing the Stress Induced by Novel Packaging in GaN HEMT Devices via Raman Spectroscopy

Micro-Raman spectroscopy was carried out to evaluate the localized residual stresses in commercial Gallium-Nitride-based devices, specifically, AlGaN/GaN high-electron-mobility Transistors (HEMTs) with a novel packaging design provided by STMicroelectronics S.r.l. (Catania, Italy). The packaging plays a key role in protecting the device core against the external environment, thus minimizing damages caused by mechanical shocks, exposure to light, and contact with chemicals, conjointly achieving an efficient heat dissipation rate. Even though the packaging is a required step for the proper functioning of ready-to-use electronic devices, its application typically may introduce mechanical stress to AlGaN/GaN HEMTs, which can result in various reliability issues. In this paper, we investigate the impact of packaging on residual stress by analyzing the frequency shift of the E2 Raman peak along GaN layers and at the GaN/Si interface. An extensive evaluation was conducted using both a packaged device and a wafer-level device. The correlation between Raman frequency shifts of the E2 mode was accurately quantified, revealing a stress mitigation of approximately 0.1 GPa. This reduction is ascribed to the compressive stress introduced by the packaging, which partially offsets the intrinsic tensile stress of the wafer-level device. The proposed methodology could, in principle, be implemented to improve the development of packaging.

A Study on Unified Modelling Approach for Memristor: Next Generation Semiconductor Devices

This research investigates the voltage-current (V-I) characteristics of three distinct memristor models, each representing a unique composition and behaviour. The model, denoted as TiN-TiOx-HfOx-Pt-Bilayered Memristor model, is a compact representation designed for Metal–Oxide Resistive Random Access Memory (RRAM). Matlab tool is used for the simulation to analyse V-I characteristics of Memristor. Through comprehensive analysis and simulations, we aim to provide a detailed insight into the intrinsic behaviours of the memristor models. Understanding the V-I characteristics of these models is crucial for their potential applications in emerging memory technologies. This Study elaborate the mathematical modelling of memristor with the outcome untuned V-I Characteristics - DC Switching characteristics. The findings contribute to the broader field of memristor research, fostering advancements in electronic memory devices and computational systems

Ab initio calculation of electronic and optical properties of vdWHs HfX2/BSb(X = Se,S) using density functional theory

Recently, another series of two-dimensional (2D) materials called van der Waals heterostructures (vdWhs) have attracted a lot of attention due to their outstanding properties and wide application in electronic and optical devices. Based on density functional theory (DFT) calculations, the properties of heterostructures were investigated with two different vertical arrangements, formed by two isolated sheets of HfX2(X = Se,S) and Boron antimonide(BSb) monolayer. In particular, vdW interactions are present in all these heterostructures rather than covalent bonding. All thevdWHsare semiconductor with indirect k-M band gap, for which the HSE06 functional exhibit a larger gap, but the electronic gap of all heterostructures is smaller than the electronic gap of their constituent sheets. In addition, all vdWHs show excellent optical absorption in the visible, near-infrared, and ultraviolet regions in the x direction, while the absorption peaks for all vdWHs are higher in the z direction. By fabricating heterostructures from isolated plates, their absorption power increases. The present review demonstrates an effective method for the design of novel vdWHs, and it explores their applications for photocatalytic, photovoltaic, and optical devices.

Low‐Temperature Epitaxy of Perovskite WO3 Thin Films under Atmospheric Conditions

As Si electronics hits fundamental performance limits, oxide integration emerges as a solution to augment the next generation of electronic and optical devices. Specifically, oxide perovskites provide diverse functionalities with a potential to create, tune, and combine emergent phenomena at interfaces. High‐level crystalline order is needed to realize these functionalities, often achieved through epitaxy. However, large‐scale implementation in consumer devices faces challenges due to the need for high‐temperature deposition in complex vacuum systems. Herein, this challenge is addressed using atmospheric pressure spatial chemical vapor deposition, a thin‐film fabrication technique that can rapidly produce uniform films at sub‐400 °C temperatures under atmospheric conditions over ≈cm2 areas. Thus, the deposition of epitaxial perovskite tungsten trioxide, WO3, thin films is demonstrated at a rate of 5 nm min−2 on single‐crystal substrates at 350 °C in open‐air conditions enabling a high‐throughput process. The resulting films exhibit crystallographic and electronic properties comparable to vacuum‐based growth above 500 °C. The high‐quality epitaxy is attributed to the energetics of the exothermic decomposition reaction of the W[CO]6 precursors combined with the stabilization of a hot zone near the substrate surface. From this work, the way can be paved for low‐temperature atmospheric‐pressure epitaxy of a wide range of other perovskite thin films.

SmartDED: A Blockchain- and Smart Contract-Based Digital Electronic Detonator Safety Supervision System

Digital electronic detonators, as a civil explosive, are of prime importance for people’s life and property safety in the process of production and operation. Therefore, the Ministry of Industry and Information Technology and the Ministry of Public Security of the People’s Republic of China have extremely high requirements for their essential safety. Existing schemes are vulnerable to tampering and single points of failure, which makes tracing unqualified digital electronic detonators difficult and identifying the responsibility for digital electronic detonator accidents hard. This paper presents a digital electronic detonator safety supervision system based on a consortium blockchain. To achieve dynamic supply chain supervision, we propose a novel digital electronic detonator supervision model together with three codes in one. We also propose a blockchain-based system that employs smart contracts to achieve efficient traceability and ensure security. We implemented the proposed model using a consortium blockchain platform and provide the cost. The evaluation results validate that the proposed system is efficient.

Tobacco control policies and respiratory conditions among children presenting in primary care

Tobacco control policies can protect child health. We hypothesised that the parallel introduction in 2008 of smoke-free restaurants and bars in the Netherlands, a tobacco tax increase and mass media campaign, would be associated with decreases in childhood wheezing/asthma, respiratory tract infections (RTIs), and otitis media with effusion (OME) presenting in primary care. We conducted an interrupted time series study using electronic medical records from the Dutch Integrated Primary Care Information database (2000–2016). We estimated step and slope changes in the incidence of each outcome with negative binomial regression analyses, adjusting for underlying time-trends, seasonality, age, sex, electronic medical record system, urbanisation, and social deprivation. Analysing 1,295,124 person-years among children aged 0–12 years, we found positive step changes immediately after the policies (incidence rate ratio (IRR): 1.07, 95% CI: 1.01–1.14 for wheezing/asthma; IRR: 1.16, 95% CI: 1.13–1.19 for RTIs; and IRR: 1.24, 95% CI: 1.14–1.36 for OME). These were followed by slope decreases for wheezing/asthma (IRR: 0.95/year, 95% CI: 0.93–0.97) and RTIs (IRR: 0.97/year, 95% CI: 0.96–0.98), but a slope increase in OME (IRR: 1.05/year, 95% CI: 1.01–1.09). We found no clear evidence of benefit of changes in tobacco control policies in the Netherlands for the outcomes of interest. Our findings need to be interpreted with caution due to substantial uncertainty in the pre-legislation outcome trends.

ATRIAL FIBRILLATION IN A CIED POPULATION: RESULTS FROM A TELEMONITORING FOLLOW–UP

Abstract Background Telemedicine has emerged as a crucial tool in managing patients with Cardiac Implantable Electronic Devices (CIED), addressing the common challenge of the Atrial Fibrillation (AF) in cardiology. The incidence of AF in CIED recipients varies widely (30–70%), influenced by implant indication, device type, and population characteristics. This study aims to evaluate AF in an unselected, real–world CIED population, considering patients’ characteristics and the remote follow–up. Methods and Results 808 consecutive CIED recipients were evaluated between 2021 and 2023 in two Italian Division of Cardiology by collecting patients’ baseline characteristics and the scheduled remote follow–up data. Mean age was 75.6±12.6 years, 42% were females. 16.7% of the population was working actively and 73% of individuals were assisted by at least one caregiver, reflecting a diminished quality of life (EQ–5D score 8.9±4.3). Over a median follow–up of 20.6 months, 8.9% of patients died. 68.8% of the patients received a pacemaker, 19.3% an ICD and 11.9% a loop recorder. History of AF was present in 40.1% of the population, with a prevalence of permanent AF (46.6%). Ongoing anticoagulant therapy was documented in 303 patients (37.5%), 71% of whom were taking direct oral anticoagulants. Baseline CHA2DS2–VASC score was ≥3 in 79.7%, and the median HAS–BLED score was 1. During the observation period, scheduled remote transmissions revealed 719 AF episodes (15.7 episodes/patient/year), causing 21% of the overall remote alarms. Among patients without AF history, 69 (14.3%) experienced AF episodes (4.8 episodes/patient/year). Notably, 21.8% of the AF episodes lasted less than 10 minutes. Conclusions The wide spreading of heart rhythm monitoring technologies reveals the challenge of the subclinical AF in healthcare systems. This study, encompassing an unselected CIED population of elderly and frail patients with high AF prevalence, highlights AF as a primary cause of remote alerts and a substantial burden in telemonitoring controls. Telemedicine facilitated new AF diagnoses in 14.3% of individuals without a prior AF history and resulted a valuable tool considering the significant cardioembolic risk in these patients. However, the initiation of anticoagulation therapy remains debatable, especially for episodes of brief duration which in our experience exceeded 20% of the cases.

IMPLANTABLE MEDICAL DEVICES: A NON INVASIVE AND COSMETIC FRONTIER FOR WOUND CLOSURE

Abstract Cardiovascular implantable electronic devices (CIEDs) implantation procedures have undergone continuous improvement. Every aspect of the procedure can contribute to these improvements, including incision closure. The aim of this study was to assess the accuracy and validity of a non–invasive method using adhesive skin closure strips for wound closure of CIEDs in older adults, instead of surgical suture, evaluating parameters such as infection, erythema, skin reaction, itching, pain, oedema, time for closure, cosmetic outcomes and patients’ satisfaction. A retrospective study was carried out in 152 subjects (mean age 81 +9.3 years).undergoing application of adhesive strips after CIEDs substitution/implant and 132 usual care control subjects (mean age 76.6+8.9). Variables considered were: age, gender, risk factors for wound complications. Wound evaluation was conducted by using the Visual Analogue Scale (VAS) and the Patient and Observer Scar Assessment Scale (POSAS). Operative time for closing the incision and for removing sutures or strips were significantly lower in both application and removal in the adhesive strip group. At follow–up evaluations, each parameter considered by evaluation of the patients and staff was significantly better than in the control group. Fewer complications were observed in the patients undergoing wound closure wit adhesive strips. Previoulsy, to the best of our knowledge, the use of adhesive strips in closing surgical wounds of patients undergoing CIEDs implant/replacement has never been considered. Adhesive strips for wound closure of CIEDs incision are characterized by shorter procedural time, optimal early and late cosmetic results, fewer complications in older patients and is cheaper. Its use for CIEDs wound closure is reasonably supported.