Development and Electrochemical Performance of Reference Prototypes for All-Solid-State Batteries

We are developing multi-hop wireless LAN access points (APs) for a Community Information Network (CIN) to be deployed in Takanawa area, Minato City, Tokyo, Japan, to transfer information supporting citizens' daily lives and to provide the internet access environment for both residents and tourists. This paper shows a prototype development of the AP device for the CIN made by the Raspberry Pi boards and performance evaluation of a multi-hop wireless LAN constructed by the prototype AP devices.

Food and energy availability have become strategic issues amid population growth and environmental crises, necessitating innovations in more efficient, adaptive, and sustainable aquaculture systems. This study focuses on the development of an integrated aquaponics system that combines fish and plant cultivation within a closed ecosystem, enhanced by Internet of Things (IoT) technology and the use of solar panels as the primary energy source. The developed system is designed to monitor environmental parameters in real time, including pH, TDS, temperature, humidity, and light intensity, as well as to track the performance of solar panel power output as part of the system’s energy management. The research methodology includes hardware and software design and integration, prototype development, functional testing, and performance analysis based on energy efficiency and aquaculture productivity. The results show that the resulting smart aquaponics prototype is energy-efficient, adaptive to environmental changes, and user-friendly, demonstrating potential to support food and energy independence at both household and community scales.

The research work is focused at developing a system prototype for an enhanced version of the Yorùbá language menu option of the ATM, introducing Yorùbá tone mark built on an enhanced translation equivalence model in order to assist users who are monolingual only in Yorùbá language to effectively interact with the system. To achieve the objective of the work, the researcher employed the equivalence translation model designed for the work and adopted traditional structured systems analysis and design methodology (SSADM) to build the system prototype. Java packages such as Java Swing, Classes and Java AWTwas incorporated in the system development. Netbean IDE was used in designing the simulation software due to its effectiveness in designing state-of-the-art GUI. The software testing and investigation was conducted engaging specialists to provide stakeholders with information about the quality and function of the system model. The performance of the system prototype showed that the new translation model is not only an improvement over the existing paradigm, but also will vastly stimulate user’s response and expansion of the ATM usage in the interior parts of the country. Keywords: Translation Model, SSADM, Java Packages, ATM Network, Host Processor

Wi-Fi Peer to Peer (P2P), commercially known as Wi-Fi Direct, is a recent industry standard that allows user devices to communicate with each other without requiring a Wi-Fi access point or Internet connectivity. Offering promising solutions for secure and high-throughput device to device communication over moderately high range, Wi-Fi P2P can potentially revolutionize M2M communication and Internet of Things (IoT) towards an all-connected wireless ecosystem. Secure Digital (SD) memory cards with built-in processing unit and Wireless LAN chipset can serve as a small standalone communication terminal which on installation of a communication protocol stack and a data-sharing application may enable connection establishment and data communication between memory cards. Such architecture may find interesting applications with manifold advantages for device-to-device data sharing in public gatherings without requiring cellular network or WLAN access points. In this paper, we develop an architecture to establish Wi-Fi P2P connection between SD memory cards and enable automatic data sharing by proximitybased device-to-device communication between mobile user equipments. The prototype does not use any of the resources of host device barring power. The key contribution of this paper is the development of a standalone prototype of our proposition on off-the-shelf WLAN SD memory cards and its experimental performance evaluation.

High–Speed electron beam curing of thick electrode for high energy density Li-ion batteries

Textile-based energy storage devices are a flexible, safe, and lightweight solution to powering wearable electronic devices. While they have benefited from the discovery of new conductive materials and innovations in device design, the limited energy density of energy storage textiles has restricted their use in practical applications. To improve the electrochemical performance of such devices requires new electrode materials that have higher electronic conductivity and theoretical capacitance than present materials. Ti₃C₂T_x, the most studied member in the MXene family, is known for its metallic conductivity and high volumetric capacitance in acidic electrolytes due to its pseudocapacitive behavior. These properties, along with its processability, make MXene an attractive material for the development of electrodes, current collectors, and interconnects for textile-based energy storage devices. The first demonstrations of MXene-based fibers and yarns showed their potential to enable energy storage in textiles. However, achieving high loadings of MXene while simultaneously demonstrating flexibility presents a critical challenge, preventing their integration into textiles using industrial manufacturing equipment. In order to improve the properties of MXene-based fibers and yarns, a systematic study is needed to understand how flake size, concentration, polymer type, and fiber architecture influence fiber/yarn properties and device performance. This dissertation aims to design and develop MXene-based fiber and yarn electrodes with high electrical conductivity and electrochemical performance for the manufacture of knitted energy storage textiles. Various methods are explored to capture and infiltrate MXene into fibers and yarns, including electrospinning and coating. By producing MXene-based fibers and yarns with different architectures (coated and composite), MXene flake size, concentration, and polymer host, the effects of fundamental material and fabrication parameters on fiber and yarn properties (mechanical, electrical, and electrochemical) are investigated. The fabrication of meters of conductive and electrochemically active fiber/yarn electrodes enabled the development of the first prototypes of knitted energy storage devices using industrial machines. The relationship between knit structure and electrochemical performance is explored to provide insights into the design of knitted energy storage devices to maximize capacitance, energy density, and power density. This dissertation represents a major step towards the mass production of knittable yarn electrodes and textile energy storage devices and their use in practical applications. Keywords: 3D Knitting, Fibers, MXene, Nanomaterials, Smart Textiles, Textile Energy Storage

Next generation turbine power plants will require high efficiency gas turbines with higher pressure ratios and turbine inlet temperatures than currently available. These increases in gas turbine cycle conditions will tend to increase NOx emissions. As the desire for higher efficiency drives pressure ratios and turbine inlet temperatures ever higher, gas turbines equipped with both lean premixed combustors and selective catalytic reduction after treatment eventually will be unable to meet the new emission goals of sub-3 ppm NOx. New gas turbine combustors are needed with lower emissions than the current state-of-the-art lean premixed combustors. In this program an advanced combustion system for the next generation of gas turbines is being developed with the goal of reducing combustor NOx emissions by 50% below the state-of-the-art. Dry Low NOx (DLN) technology is the current leader in NOx emission technology, guaranteeing 9 ppm NOx emissions for heavy duty F class gas turbines. This development program is directed at exploring advanced concepts which hold promise for meeting the low emissions targets. The trapped vortex combustor is an advanced concept in combustor design. It has been studied widely for aircraft engine applications because it has demonstrated the ability to maintain a stable flame over a wide range of fuel flow rates. Additionally, it has shown significantly lower NOx emission than a typical aircraft engine combustor and with low CO at the same time. The rapid CO burnout and low NOx production of this combustor made it a strong candidate for investigation. Incremental improvements to the DLN technology have not brought the dramatic improvements that are targeted in this program. A revolutionary combustor design is being explored because it captures many of the critical features needed to significantly reduce emissions. Experimental measurements of the combustor performance at atmospheric conditions were completed in the first phase of the program. Emissions measurements were obtained over a variety of operating conditions. A kinetics model is formulated to describe the emissions performance. The model is a tool for determining the conditions for low emission performance. The flow field was also modeled using CFD. A first prototype was developed for low emission performance on natural gas. The design utilized the tools anchored to the atmospheric prototype performance. The 1/6 scale combustor was designed for low emission performance in GE's FA+e gas turbine. A second prototype was developed to evaluate changes in the design approach. The prototype was developed at a 1/10 scale for low emission performance in GE's FA+e gas turbine. The performance of the first two prototypes gave a strong indication of the best design approach. Review of the emission results led to the development of a 3rd prototype to further reduce the combustor emissions. The original plan to produce a scaled-up prototype was pushed out beyond the scope of the current program. The 3rd prototype was designed at 1/10 scale and targeted further reductions in the full-speed full-load emissions.

The increasing demand for continuous and reliable air traffic surveillance over remote and oceanic regions has prompted the exploration of innovative solutions beyond traditional radar and satellite-based systems. In this context, High-Altitude Pseudo-Satellites (HAPSs) have emerged as a promising technology capable of extending surveillance and communication coverage within the stratosphere at significantly lower cost and greater operational flexibility. This paper presents the results of Research and Development (R&D) efforts focused on the conceptualization and development of a HAPS prototype serving as a proof of concept to enhance Air Traffic Management (ATM) surveillance capabilities. The study quantitatively examines the HAPS operational environment by classifying and evaluating the geometric, physical, environmental, thermal and atmospheric factors influencing prototype performance. The developed prototype establishes a scalable foundation for future multi-platform HAPS networks, and forthcoming research will focus on experimental validation under real-world conditions and performance optimization to enable integration into next-generation ATM systems.

Prototype development of the rooftop turbine ventilator powered by hybrid wind and photovoltaic energy