Preliminary Research on a High Thrust-to-Weight Ratio of Double-Sided Composite Impeller Microturbine Engine

In some situations, the improvement of the thrust-to-weight ratio (TWR) of microturbine engines (MTEs) for energy-, economic-, and environment-related reasons can be achieved for military or civilian purposes. However, due to limitations of existing traditional MTE technology, it is difficult to meet the key requirements of small aircraft for high energy/power density and low-cost power, especially for long-endurance drone swarms. To address these problems, a novel compact concept of a high-TWR of MTE with a double-sided composite impeller (DSCI) is proposed in this research. First, the principle and structure of the concept are explained through theoretical analysis, and its potential advantages are discussed. Second, the DSCI is analyzed at the top level, and the design principle and important parameters are discussed. The DSCI and supporting jet engine are preliminarily designed. Then, their weight is estimated. Finally, theoretical analytical and numerical simulations are used to preliminarily research the performance parameters of DSCI jet engine at the design point, and the parameters are discussed. These calculations showed encouraging results, with all components of the DSCI jet engine meeting matching characteristics. Compared to the JetCat P500-PRO-GH, the DSCI jet engine has a 39.4% increase in TWR and a 36.82% decrease in specific fuel consumption (sfc). This study lays a foundation for the development of high energy/power density MTEs in the future.

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Na0.76V6O15/Activated Carbon Hybrid Cathode for High-Performance Lithium-Ion Capacitors

Materials ◽

10.3390/ma14010122 ◽

2020 ◽

Vol 14 (1) ◽

pp. 122

Author(s):

Renwei Lu ◽

Xiaolong Ren ◽

Chong Wang ◽

Changzhen Zhan ◽

Ding Nan ◽

...

Keyword(s):

Activated Carbon ◽

Energy Density ◽

Power Density ◽

Cathode Materials ◽

Low Cost ◽

Lithium Ion ◽

High Energy ◽

Cycling Stability ◽

High Energy Density ◽

Artificial Graphite

Lithium-ion hybrid capacitors (LICs) are regarded as one of the most promising next generation energy storage devices. Commercial activated carbon materials with low cost and excellent cycling stability are widely used as cathode materials for LICs, however, their low energy density remains a significant challenge for the practical applications of LICs. Herein, Na0.76V6O15 nanobelts (NaVO) were prepared and combined with commercial activated carbon YP50D to form hybrid cathode materials. Credit to the synergism of its capacitive effect and diffusion-controlled faradaic effect, NaVO/C hybrid cathode displays both superior cyclability and enhanced capacity. LICs were assembled with the as-prepared NaVO/C hybrid cathode and artificial graphite anode which was pre-lithiated. Furthermore, 10-NaVO/C//AG LIC delivers a high energy density of 118.9 Wh kg−1 at a power density of 220.6 W kg−1 and retains 43.7 Wh kg−1 even at a high power density of 21,793.0 W kg−1. The LIC can also maintain long-term cycling stability with capacitance retention of approximately 70% after 5000 cycles at 1 A g−1. Accordingly, hybrid cathodes composed of commercial activated carbon and a small amount of high energy battery-type materials are expected to be a candidate for low-cost advanced LICs with both high energy density and power density.

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Low-cost high-performance asymmetric supercapacitors based on Co2AlO4@MnO2 nanosheets and Fe3O4 nanoflakes

Journal of Materials Chemistry A ◽

10.1039/c5ta09914e ◽

2016 ◽

Vol 4 (6) ◽

pp. 2096-2104 ◽

Cited By ~ 79

Author(s):

Fei Li ◽

Hao Chen ◽

Xiao Ying Liu ◽

Shi Jin Zhu ◽

Jia Qi Jia ◽

...

Keyword(s):

Power Density ◽

High Performance ◽

Low Cost ◽

High Energy ◽

Wearable Electronics ◽

Asymmetric Supercapacitors ◽

Power Sources ◽

Mno2 Nanosheets ◽

Increasing Demand

The development of portable and wearable electronics has promoted the increasing demand for high-performance power sources with high energy/power density, low cost, lightweight, as well as ultrathin and flexible features.

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A strategy for designing low-cost, environment-friendly, high energy and power density sodium-ion full cells: Effect of extrinsic pseudocapacitance

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2020.157238 ◽

2021 ◽

Vol 854 ◽

pp. 157238 ◽

Cited By ~ 1

Author(s):

Sambedan Jena ◽

Arijit Mitra ◽

Saptarshi Das ◽

Debasish Das ◽

Sparsh Agrawal ◽

...

Keyword(s):

Power Density ◽

Low Cost ◽

High Energy ◽

Sodium Ion ◽

Environment Friendly ◽

Energy And Power Density

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Toward Low-Cost, High-Energy Density, and High-Power Density Lithium-Ion Batteries

JOM ◽

10.1007/s11837-017-2404-9 ◽

2017 ◽

Vol 69 (9) ◽

pp. 1484-1496 ◽

Cited By ~ 61

Author(s):

Jianlin Li ◽

Zhijia Du ◽

Rose E. Ruther ◽

Seong Jin AN ◽

Lamuel Abraham David ◽

...

Keyword(s):

Energy Density ◽

Lithium Ion Batteries ◽

Power Density ◽

High Power ◽

Low Cost ◽

Lithium Ion ◽

High Energy ◽

High Energy Density ◽

High Power Density

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Janus – A New Approach to Air Combat Pilot Training

Transactions on Aerospace Research ◽

10.2478/tar-2019-0019 ◽

2019 ◽

Vol 2019 (4) ◽

pp. 7-22

Author(s):

Georges Bridel ◽

Zdobyslaw Goraj ◽

Lukasz Kiszkowiak ◽

Jean-Georges Brévot ◽

Jean-Pierre Devaux ◽

...

Keyword(s):

Low Cost ◽

Cost Effective ◽

High Energy ◽

Training System ◽

Embedded Sensors ◽

Pilot Training ◽

New Approach ◽

Combat Aircraft ◽

Air Combat ◽

The Cost

Abstract Advanced jet training still relies on old concepts and solutions that are no longer efficient when considering the current and forthcoming changes in air combat. The cost of those old solutions to develop and maintain combat pilot skills are important, adding even more constraints to the training limitations. The requirement of having a trainer aircraft able to perform also light combat aircraft operational mission is adding unnecessary complexity and cost without any real operational advantages to air combat mission training. Thanks to emerging technologies, the JANUS project will study the feasibility of a brand-new concept of agile manoeuvrable training aircraft and an integrated training system, able to provide a live, virtual and constructive environment. The JANUS concept is based on a lightweight, low-cost, high energy aircraft associated to a ground based Integrated Training System providing simulated and emulated signals, simulated and real opponents, combined with real-time feedback on pilot’s physiological characteristics: traditionally embedded sensors are replaced with emulated signals, simulated opponents are proposed to the pilot, enabling out of sight engagement. JANUS is also providing new cost effective and more realistic solutions for “Red air aircraft” missions, organised in so-called “Aggressor Squadrons”.

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High-Energy-Density, Long-Life Lithium–Sulfur Batteries with Practically Necessary Parameters Enabled by Low-Cost Fe–Ni Nanoalloy Catalysts

ACS Nano ◽

10.1021/acsnano.1c00446 ◽

2021 ◽

Author(s):

Jiarui He ◽

Amruth Bhargav ◽

Arumugam Manthiram

Keyword(s):

Energy Density ◽

Low Cost ◽

High Energy ◽

High Energy Density ◽

Lithium Sulfur Batteries ◽

Long Life ◽

Lithium Sulfur

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Optically transparent and very thin structure against electromagnetic pulse (EMP) using metal mesh and saltwater for shielding windows

Scientific Reports ◽

10.1038/s41598-021-80969-3 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Duy Tung Phan ◽

Chang Won Jung

Keyword(s):

Electromagnetic Pulse ◽

Low Cost ◽

High Energy ◽

Metal Plate ◽

Optical Transparency ◽

Shielding Effectiveness ◽

Concrete Wall ◽

Metal Mesh ◽

Wide Range ◽

Optically Transparent

AbstractAn electromagnetic pulse (EMP) with high energy can damage electronic equipment instantly within a wide range of thousands of kilometers. Generally, a metal plate placed inside a thick concrete wall is used against an EMP, but it is not suitable for an EMP shielding window, which requires not only strong shielding effectiveness (SE) but also optical transparency (OT). In this paper, we propose a very thin and optically transparent structure with excellent SE for EMP shielding window application. The proposed structure consists of a saltwater layer held between two glass substrates and two metal mesh layers on the outside of the glass, with a total thickness of less than 1.5 cm. The SE and OT of the structure are above 80 dB and 45%, respectively, which not only meet the requirement of EMP shielding for military purposes but also retain the procedure of good observation. Moreover, the OT of the structure can be significantly improved using only one metal mesh film (MMF) layer, while the SE is still maintained high to satisfy the required SE for home applicants. With the major advantages of low cost, optical transparency, strong SE, and flexible performance, the proposed structure can be considered a good solution for transparent EMP shielding windows.

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IoT Platform for Energy Sustainability in University Campuses

Sensors ◽

10.3390/s21020357 ◽

2021 ◽

Vol 21 (2) ◽

pp. 357

Author(s):

Pedro Moura ◽

José Ignacio Moreno ◽

Gregorio López López ◽

Manuel Alvarez-Campana

Keyword(s):

Energy Demand ◽

New Technologies ◽

Low Cost ◽

Sustainable Use ◽

High Energy ◽

Appropriate Technology ◽

Monitoring And Control ◽

Energy Sustainability ◽

University Campuses ◽

Iot Platform

University campuses are normally constituted of large buildings responsible for high energy demand, and are also important as demonstration sites for new technologies and systems. This paper presents the results of achieving energy sustainability in a testbed composed of a set of four buildings that constitute the Telecommunications Engineering School of the Universidad Politécnica de Madrid. In the paper, after characterizing the consumption of university buildings for a complete year, different options to achieve more sustainable use of energy are presented, considering the integration of renewable generation sources, namely photovoltaic generation, and monitoring and controlling electricity demand. To ensure the implementation of the desired monitoring and control, an internet of things (IoT) platform based on wireless sensor network (WSN) infrastructure was designed and installed. Such a platform supports a smart system to control the heating, ventilation, and air conditioning (HVAC) and lighting systems in buildings. Furthermore, the paper presents the developed IoT-based platform, as well as the implemented services. As a result, the paper illustrates how providing old existing buildings with the appropriate technology can contribute to the objective of transforming such buildings into nearly zero-energy buildings (nZEB) at a low cost.

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A High-Performance Free-Standing Zn Anode for Flexible Zinc-Ion Batteries

Nanoscale ◽

10.1039/d1nr01266e ◽

2021 ◽

Author(s):

Chenxi Gao ◽

Jiawei Wang ◽

Yuan Huang ◽

Zixuan Li ◽

Jiyan Zhang ◽

...

Keyword(s):

Energy Density ◽

High Performance ◽

Low Cost ◽

High Energy ◽

Zinc Ion ◽

High Energy Density ◽

Free Standing ◽

Energy Device ◽

Zn Anode ◽

Significant Attention

Zinc-ion batteries (ZIBs) have attracted significant attention owing to their high safety, high energy density, and low cost. ZIBs have been studied as a potential energy device for portable and...

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