The proceedings contain 14 papers. The topics discussed include: ultrashort throw lenses with catadioptric relay suitable for flat and curved screens;light field displays for near eye vR and AR;wide angle lens with im...
ISBN:
(纸本)9781510637702
The proceedings contain 14 papers. The topics discussed include: ultrashort throw lenses with catadioptric relay suitable for flat and curved screens;light field displays for near eye vR and AR;wide angle lens with improved relative illumination characteristics;optimization of a mobile phone camera for as-built performance;inverse designed flat optics with multilevel diffractive lenses;opticaldesign of triple-mode seeker;comparison of passive athermalization results of LWIR opticaldesigns utilizing different infrared optical materials;and design of an anastigmatic three-mirror telescope using freeform surfaces.
The design and implementation of Underwater Wireless optical Communication (UWOC) provide important scientific problems. UWOC has the ability to transmit data at a high pace across long distances. This essay makes an ...
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The creation and implementation of a system that bridges visible light communication (vLC) with selected identifiers, envisioned as informational beacons, are outlined. This system is adept at controlling LED panels a...
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A polarization reconfigurable metasurface wideband antenna with dual polarized and a low radar cross section (RCS) is presented. The antenna employs a diode positioned between two transmission lines to control the cur...
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Rechargeable aluminum-ion batteries (AIBs) possess a higher theoretical volumetric capacity than lithium-ion batteries (LIBs) and offer a sustainable, low-cost alternative. However, the performance of AIBs fails to me...
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Rechargeable aluminum-ion batteries (AIBs) possess a higher theoretical volumetric capacity than lithium-ion batteries (LIBs) and offer a sustainable, low-cost alternative. However, the performance of AIBs fails to meet commercial standards due to the challenges experienced including volume changes caused by interfacial issues, side reactions of the electrolyte with electrode, and low cyclic stability. These issues are attributed to the inability of existing cathode materials to perform effectively. To address these challenges, 1-dimensional (1D) structures, especially nanofiber (NF) cathodes offer a promising solution due to their higher aspect ratios, specific surface area, flexibility, and quantum scale effects. To date, there has been no comparative analysis of the electrochemical and structural performances of NF based cathodes in AIBs. Thus, this review focuses on the recent developments in various transition metal oxides and chalcogenides of (Mo, v, Mn, Ni, Cu, W, Se, and Co) along with carbon-based NFs as cathodes for AIBs. Challenges were observed in adopting trivalent Al3+ cations as charge carriers and maintaining the structural integrity of the cathode. Several novel approaches have been developed to enhance electrical conductivity, including the incorporation of the metal oxides/chalcogenides with the carbon NF substrates, crystallizing the nanoparticles at high temperatures, and using self-assembly and templating techniques to create multi-dimensional NF films. Other battery components such as separators were replaced with carbonaceous structures in the MnSe based cathodes to increase ion mobility, and Mo current collectors to prevent dendrites. This review includes prospects aimed at improving performance and functionality, based on observations from the discussed work and innovations in AIBs such as compositing, surface functionalization, and defect engineering through ion doping.
In the proposed study, a topical issue of modern electronics is considered - the creation of an algorithm for ensuring the stability of FSO technology against optical interference, and its solution is proposed using a...
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As tall wooden structures emerge as a burgeoning and promising sector, offering considerable ecological and financial benefits across their life cycles, their prevalence is on the rise, particularly in Europe. However...
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As tall wooden structures emerge as a burgeoning and promising sector, offering considerable ecological and financial benefits across their life cycles, their prevalence is on the rise, particularly in Europe. However, the current corpus of literature fails to offer a detailed assessment of the fundamental architectural and structural planning parameters for European tall timber towers (>= 9 stories). To span this gap and improve the comprehension of the developing European tendencies, this study meticulously examined information from 33 tall timber towers in Europe. The principal findings uncovered the following: (i) tall timber buildings predominantly favored residential applications as their primary function, (ii) the prevailing preference for the central core arrangement was evident, (iii) the most prevalent design preference for tall timber buildings was prismatic forms, (iv) widespread adoption of composite materials was evident, with combinations of timber and concrete being particularly prominent, and (v) the structural systems were primarily characterized by shear-frame configurations. By revealing these present-day attributes of tall wooden towers in Europe, this article is anticipated to offer valuable insights to architectural designers, assisting and directing them in the formulation and implementation of forthcoming developments in this domain.
Hydrogen is a remarkable molecule with applications ranging from refining and petrochemicals to medicine, to space travel and the energy transition. It consists of two spin isomers, namely orthohydrogen (ortho-H-2) an...
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Hydrogen is a remarkable molecule with applications ranging from refining and petrochemicals to medicine, to space travel and the energy transition. It consists of two spin isomers, namely orthohydrogen (ortho-H-2) and parahydrogen (para-H-2), that are separated in energy by only 1.455 kJ/mol. Chemically, these isomers are indistinguishable, yet each isomer has its own unique physical properties including thermal conductivity, optical behavior, and specific heat capacity. These physical traits are important during hydrogen liquefaction because the para-H-2 form is more stable at cryogenic temperatures (i.e., T < 77 K). In the context of energy transition, the production and supply of liquid hydrogen requires the application of a catalyst in liquefaction plants to induce hydrogen isomer interconversion via the process known colloquially as "spin-flipping." The same catalyst can also improve brightness in neutron spallation sources, or enable the parahydrogen induced hyperpolarization (PHIP) technique used in magnetic imaging. Although the current preferred catalyst for these applications is a class of iron oxide materials, only a limited set of catalyst performance data is available. A confluence of this data was measured more than half a century ago, often using catalyst samples synthesized at lab-scale, and/or derived under reaction conditions irrelevant for practical application. Consequently, the few widely cited kinetic models for this system were developed by fitting data against an even smaller subset of this data limited by temperature or pressure conditions, all from the 1950s/1960s. It is reasonable to question if these models have predictive capabilities that are relevant for the current-day design using today's commercial catalyst. Our work compares three of these kinetic models against new Ionex Type O-P Catalyst conversion data, spanning >300 data points across a broad and industrially relevant temperature-pressure window, and four published experimenta
In order to meet the needs of Internet of Things devices and wearable electronic devices for lower standby power consumption and power supply noise, a Low Dropout Regulator (LDO) circuit with low quiescent current and...
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In this work, we present the simulation and analysis of an oxide-confined vertical-cavity surface-emitting laser (vCSEL) using the Finite Difference Frequency Domain (FDFD) microcavity model, integrated within the Cro...
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