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current scenario in ternary metal indium sulfides-based heterojunctions for photocatalytic energy and environmental applications: A review

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MATERIALS TODAY COMMUNICATIONS 2023年 36卷

作者： Sharma, Pankaj Kumar, Amit Zheng, Gege Mashifana, Tebogo Dhiman, Pooja Sharma, Gaurav Stadler, Florian J. Shoolini Univ Int Res Ctr Nanotechnol Himalayan Sustainabil IRCN Solan 173229 India Shenzhen Univ Coll Mat Sci & Engn Guangdong Res Ctr Interfacial Engn Funct Mat Shenzhen Key Lab Polymer Sci & Technol Shenzhen 518055 Peoples R China Univ Johannesburg Dept Chem Engn POB 17011 ZA-2088 Johannesburg South Africa

The mounting pressure of the energy crisis and environmental pollution has led to unprecedented developments in designing new age materials with superior properties for solar and visible light energy conversion. In light of this, semiconductor photocatalysts have been recognized the most preferred materials for the generation of clean energy and advanced water treatment. With strong visible light absorption, tuneable band width, low toxicity, excellent stability, and a longer lifetime of excited charge-carriers, indium sulphide and ternary metal indium sulphides (MISs) have high potential for applicability in fields of photocatalytic water detoxification, hydrogen evolution, and energy production. To harness the advantages to the fullest and address the inherent drawbacks, numerous metal indium sulphides, nanocomposites, and heterojunctions have been developed in addition to optical and defect engineering and hybridization. In this review, various synthetic routes for improved photo-catalytic performance are discussed, followed by discussions on Z-scheme, S-scheme, and p-n heterojunctions of metal indium sulfides. The most recent advances in the design and utilisation of metal indium sulfide-based heterostructures for photocatalytic applications in environmental contaminants degradation and energy con-version are then summarised. Lastly, some future prospective and future recommendations for photocatalytic activity are discussed. Finally, the challenges, outlook, and research directions for designing superior next-generation MISs-based photocatalysts are discussed.

关键词： Metal indium sulfide Photocatalysis Heterojunctions Water treatment H2 generation

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Promising New Horizons in Medicine: Medical Advancements with Nanocomposite Manufacturing via 3D Printing

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POLYMERS 2023年第20期15卷 4122-4122页

作者： Li, Nan Khan, Sadaf Bashir Chen, Shenggui Aiyiti, Wurikaixi Zhou, Jianping Lu, Bingheng Xinjiang Univ Sch Mech Engn Urumqi 830017 Peoples R China Southwest Univ Sci & Technol Sch Mfg Sci & Engn Key Lab Testing Technol Mfg Proc Minist Educ Mianyang 621010 Peoples R China Dongguan Univ Technol Sch Educ Normal Sch Dongguan 523808 Peoples R China Guangzhou Panyu Polytech Sch Art & Design Guangzhou 511483 Peoples R China

Three-dimensional printing technology has fundamentally revolutionized the product development processes in several industries. Three-dimensional printing enables the creation of tailored prostheses and other medical equipment, anatomical models for surgical planning and training, and even innovative means of directly giving drugs to patients. Polymers and their composites have found broad usage in the healthcare business due to their many beneficial properties. As a result, the application of 3D printing technology in the medical area has transformed the design and manufacturing of medical devices and prosthetics. Polymers and their composites have become attractive materials in this industry because of their unique mechanical, thermal, electrical, and optical qualities. This review article presents a comprehensive analysis of the current state-of-the-art applications of polymer and its composites in the medical field using 3D printing technology. It covers the latest research developments in the design and manufacturing of patient-specific medical devices, prostheses, and anatomical models for surgical planning and training. The article also discusses the use of 3D printing technology for drug delivery systems (DDS) and tissue engineering. Various 3D printing techniques, such as stereolithography, fused deposition modeling (FDM), and selective laser sintering (SLS), are reviewed, along with their benefits and drawbacks. Legal and regulatory issues related to the use of 3D printing technology in the medical field are also addressed. The article concludes with an outlook on the future potential of polymer and its composites in 3D printing technology for the medical field. The research findings indicate that 3D printing technology has enormous potential to revolutionize the development and manufacture of medical devices, leading to improved patient outcomes and better healthcare services.

关键词： tissue engineering nanocomposite drug delivery systems (DDS) medicine 3D printing stereolithography fused deposition modeling (FDM)

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Cascaded Logic Gates Based on High-Performance Ambipolar Dual-Gate WSe2 Thin Film Transistors

arXiv

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arXiv 2023年

作者： Li, Xintong Zhou, Peng Hu, Xuan Rivers, Ethan Watanabe, Kenji Taniguchi, Takashi Akinwande, Deji Friedman, Joseph S. Incorvia, Jean Anne C. Department of Electrical and Computer Engineering The University of Texas at Austin AustinTX78712 United States Department of Electrical and Computer Engineering The University of Texas at Dallas RichardsonTX75080-3021 United States Research Center for Electronic and Optical Materials National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan

Ambipolar dual-gate transistors based on two-dimensional (2D) materials, such as graphene, carbon nanotubes, black phosphorus, and certain transition metal dichalcogenides (TMDs), enable reconfigurable logic circuits with suppressed off-state current. These circuits achieve the same logical output as CMOS with fewer transistors and offer greater flexibility in design. The primary challenge lies in the cascadability and power consumption of these logic gates with static CMOS-like connections. In this article, high-performance ambipolar dual-gate transistors based on tungsten diselenide (WSe2) are fabricated. A high on-off ratio of 108and 106, a low off-state current of 100 to 300 fA, a negligible hysteresis, and an ideal subthreshold swing of 62 and 63 mV/dec are measured in the p- and n-type transport, respectively. For the first time, we demonstrate cascadable and cascaded logic gates using ambipolar TMD transistors with minimal static power consumption, including inverters, XOR, NAND, NOR, and buffers made by cascaded inverters. A thorough study of both the control gate and polarity gate behavior is conducted, which has previously been lacking. The noise margin of the logic gates is measured and analyzed. The large noise margin enables the implementation of VT-drop circuits, a type of logic with reduced transistor number and simplified circuit design. Finally, the speed performance of the VT-drop and other circuits built by dual-gate devices are qualitatively analyzed. This work lays the foundation for future developments in the field of ambipolar dual-gate TMD transistors, showing their potential for low-power, high-speed and more flexible logic circuits. © 2023, CC BY.

关键词： Logic gates

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A fault tolerant reconfigurable ATM switch fabric

A fault tolerant reconfigurable ATM switch fabric

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IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： S.-C. Yang J.A. Silvester Department of Electrical Engineering-Systems University of Southern California Los Angeles CA USA

A high-bandwidth reconfigurable asynchronous transfer mode (ATM) switch fabric is proposed. The design is modular to allow for expansion to a large switch size and is feasible for implementation with current technology 2*2 buffered electronic crossbar switches. It uses wavelength division multiplexing of fiber channels in combination with nonagile tunable laser diodes. A novel approach for reconfiguration of the switch fabric is proposed. It is shown that with relatively low hardware overhead, a highly reliable switch fabric can be achieved while maintaining high bandwidth. Maximum fault tolerance is studied by mapping to the marriage problem of graph theory. The results provided by this approach significantly reduce the tuning range needed for reconfiguring the switch.< >

关键词： Switches Fault tolerance Asynchronous transfer mode Fabrics optical buffering Wavelength division multiplexing Tunable circuits and devices Diode lasers Hardware Maintenance

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Optimizing the design of FT-IR spectroscopic imaging instruments to obtain increased spatial resolution of chemical species

Optimizing the design of FT-IR spectroscopic imaging instrum...

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IEEE International Symposium on Biomedical Imaging

作者： R. Reddy D. Mayerich M. Walsh M. Schulmerich P. S. Carney R. Bhargava Department of Bioengineering University of Illinois Urbana-Champaign USA Beckman Institute for Advanced Science and Technology UIUC USA Beckman Institute for Advanced Science and Technology Department of Electrical and Computer Engineering UIUC USA Cancer Center University of Illinois USA

Fourier transform infrared (FT-IR) spectroscopic imaging provides spatially resolved chemical information. Recent developments have shown that this chemical information can be used to determine tissue cell types. Our goal is then to use the spatial distribution of tissue cell types to perform accurate diagnosis of cancer. However, this step is limited by the spatial resolution provided by current imaging systems. In this paper, we demonstrate that these instruments can be designed to provide better spatial resolution for tissue chemistry. We present an optical model for the propagation of light through an FT-IR spectroscopic imaging system. Using this model, we minimally modify an existing FT-IR spectroscopic imaging system to obtain significantly higher resolution and image quality. We demonstrate that it is possible to identify previously obscured tissue types by performing histological classification based on bio-chemically derived spectral features (metrics).

关键词： Imaging Chemicals Instruments Spatial resolution Cancer Detectors

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designing for Degradation: Transient Devices Enabled by (Nano)Cellulose

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ADVANCED MATERIALS 2024年第0期 e2401560页

作者： Andrew, Lucas J. Lizundia, Erlantz MacLachlan, Mark J. Univ British Columbia Dept Chem 2036 Main Mall Vancouver BC V6T 1Z1 Canada Univ Basque Country UPV EHU Fac Engn Bilbao Dept Graph Design & Engn Projects Life Cycle Thinking Grp Bilbao 48013 Spain Basque Ctr Mat Applicat & Nanostruct BCMaterials UPV EHU Sci Pk Leioa 48940 Spain Univ British Columbia Stewart Blusson Quantum Matter Inst 2355 East Mall Vancouver BC V6T 1Z4 Canada Kanazawa Univ WPI Nano Life Sci Inst Kanazawa 9201192 Japan UBC BioProd Inst 2385 East Mall Vancouver BC V6T 1Z4 Canada

Transient technology involves materials and devices that undergo controlled degradation after a reliable operation period. This groundbreaking strategy offers significant advantages over conventional devices based on non-renewable materials by limiting environmental exposure to potentially hazardous components after disposal, and by increasing material circularity. As the most abundant naturally occurring polymer on Earth, cellulose is an attractive material for this purpose. Besides, (nano)celluloses are inherently biodegradable and have competitive mechanical, optical, thermal, and ionic conductivity properties that can be exploited to develop sustainable devices and avoid the end-of-life issues associated with conventional systems. Despite its potential, few efforts have been made to review current advances in cellulose-based transient technology. Therefore, this review catalogs the state-of-the-art developments in transient devices enabled by cellulosic materials. To provide a wide perspective, the various degradation mechanisms involved in cellulosic transient devices are introduced. The advanced capabilities of transient cellulosic systems in sensing, photonics, energy storage, electronics, and biomedicine are also highlighted. current bottlenecks toward successful implementation are discussed, with material circularity and environmental impact metrics at the center. It is believed that this review will serve as a valuable resource for the proliferation of cellulose-based transient technology and its implementation into fully integrated, circular, and environmentally sustainable devices. Recent progress in transient devices enabled by (nano)cellulosic materials is reviewed. Transiency mechanisms, advantages of nanocelluloses, and a suite of applications are discussed. A circular thinking approach coupled with life cycle assessment is applied to critically revisit the potential, advantages, and challenges of nanocellulose-enabled transient devices for future ma

关键词： biodegradable circular economy nanocellulose sustainability transiency

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ARTIFICIAL NEURAL NETWORKS AND THEIR APPLICATION TO WEAPONS

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NAVAL ENGINEERS JOURNAL 1991年第3期103卷 46-59页

作者： WEBSTER, WP The Author The Author is the technology manager for the Intercept Weapons Department at the Naval Weapons Center China Lake Calif. Dr. Webster received his B.S. M.S. and Ph.D. degrees in electrical engineering at the University of Arizona Tucson Arizona in 1964 1966 and 1971 respectively. While at the University of Arizona his studies focused on electromagnetic field propagation and scattering and laser radar system design. Since graduation he has worked at the Naval Weapons Center in a variety of technology areas including laser radar system design infrared system design proximity fuze system design hybrid and monolithic microelectronic circuit design and fabrication technology airborne fire control sensor technology and anti-air and anti-surface missile guidance and control technology. Currently he is responsible for identifying selecting and directing the development of advanced guidance sensor signal processing and aerodynamic control system technologies for application to U.S. Navy tactical electro-optical and radio frequency air intercept missiles. Dr. Webster is a member of IEEE Sigma Xi and Tau Beta Pi.

Complex processing algorithms associated with requirements for real-time target detection, acquisition and recognition have far outdistanced our ability to package the necessary processing power into real-time weapon-sized hardware. Weapon developers need new, radically different, approaches to solve these difficult weapon signal processing problems. Artificial neural networks (ANN) is one of the new, radically different, signal processing approaches that is currently receiving much attention for weapon applications. The human brain is a powerful image and pattern recognition processor whose basic processing element is the neuron. Synapses are the weighted interconnections between neurons that permit learning and communication between the neurons. Artificial neural network technology attempts to mathematically and/or electrically model neurons and synapses and then interconnect these models in architectures suitable for signal processing tasks. ANN technology is particularly applicable to pattern recognition, speech recognition, machine vision, robotics, and optimization signal processing tasks. Specific military applications include missile seekers, missile fuzing, sonar target discrimination, automatic target recognition, and autopilots. Two unique characteristics of ANN processors are that they are non-linear processors and that they are trained, not programmed, to accomplish processing tasks in a manner analogous to the way the human brain learns. Learning is achieved by modifying the synaptic weights of each artificial neuron until the final desired system processing response is achieved. Several years ago the Naval Weapons Center (NavWpnCen) identified ANN technology as a high risk-high payoff approach to missile signal processing requirements and initiated several research and development efforts in this area. One result of this work is the new 80170NW ANN analog VLSI chip produced by Intel Inc. Another is the current Missileborne Integrated Neural Network De

关键词： Neural Networks

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丝素蛋白纤维及功能化材料的设计与构筑

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高分子学报 2021年第1期52卷 29-46,I0003,I0001页

作者：范苏娜陈杰顾张弘姚响张耀鹏东华大学纤维材料改性国家重点实验室材料科学与工程学院上海201620

随着环境污染、资源枯竭和医疗健康等问题的加剧,研发同时满足特定使用性能、安全性及可再生性的新型材料成为当前的发展趋势.而丝素蛋白材料正是以天然蚕丝为基本原材料,经一定的加工和功能化而形成的具有特殊结构、独特性能和广泛应... 详细信息

随着环境污染、资源枯竭和医疗健康等问题的加剧,研发同时满足特定使用性能、安全性及可再生性的新型材料成为当前的发展趋势.而丝素蛋白材料正是以天然蚕丝为基本原材料,经一定的加工和功能化而形成的具有特殊结构、独特性能和广泛应用的生物质材料,近年来在生物医药、生物电子、智能传感等领域展现出巨大的应用潜力.本专论总结了丝素蛋白纤维及功能化材料的最新成果,结合本课题组相关工作,重点阐述了再生丝素蛋白纤维的仿生制备、生物医用支架的构筑与功能化、智能电子材料的设计以及天然多功能蚕丝及其构筑基元制备的研究进展,以期为高性能丝素蛋白材料的设计与构筑提供指导和借鉴.

关键词：丝素蛋白多级结构功能材料仿生构筑

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OPTICAM PM machine design

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Precision engineering 1993年第3期15卷 208-208页

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Fabrication of off-axis optical segments

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Precision engineering 1993年第3期15卷 203-203页

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