Готові списки джерел за темами / Stealth material

Добірка наукової літератури з теми "Stealth material"

Автор: Grafiati

Опубліковано: 1 червня 2024

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Статті в журналах з теми "Stealth material":

Luo, Ziyin, Qizheng Zhou, and Peng Guo. "Microstructure Design and Performance Optimization of Constant Modulus Pentamode Materials Acoustic Cloak." Crystals 12, no. 11 (November 4, 2022): 1572. http://dx.doi.org/10.3390/cryst12111572.

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Underwater acoustic stealth has great scientific research value. According to acoustic coordinate transformation theory, the acoustic stealth cloak based on pentamode materials can realize underwater broadband acoustic stealth. However, due to the correlation between the density and modulus of pentamode materials and the changes in the parameters of each layer of the acoustic stealth cloak, a large amount of structural optimization work is required for the pentamode material to meet the specific parameter requirements, which significantly increases the difficulty of the pentamode acoustic stealth cloak design. To simplify the design process, inspired by the calculation of equivalent modulus by representation volume element, this article proposed a pentamode material configuration with independent variation of density and modulus and designed a 1 m radius acoustic stealth cloak with a specific structure of pentamode materials matching the coordinate transformation equation of constant modal mapping. After simulation calculation and optimization design, in the range of a/λ from 0 to 1, the average total scattering cross-section of the cavity with a radius of 0.5 m covered by the acoustic stealth cloak is 0.858; the average total scattering cross-section of the cavity is 19.718 after removing the pentamode material acoustic stealth cloak. The results of the study are expected to provide some method references for simplifying the design process of the pentamode material acoustic stealth cloak and the microstructure design of the pentamode materials.

Zhang, Zhixun, Mingyang Yang, Yibo Zhang, and Ming Zhou. "Research and Application of Terahertz Response Mechanism of Few-Layer Borophene." Nanomaterials 12, no. 15 (August 5, 2022): 2702. http://dx.doi.org/10.3390/nano12152702.

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The terahertz stealth and shielding performance of a new type of two-dimensional material, borophene, has been studied theoretically and experimentally. Studies have shown that borophene materials have good terahertz stealth and shielding properties. First-principles calculations show that compared with single-layer borophene, few-layer borophene has good terahertz stealth and shielding performance in the range of 0.1~2.7 THz. In the range of 2~4 layers, the terahertz stealth and shielding performance of few-layer borophene increases with the increase of the number of layers. The finite element simulation calculation results also confirmed this point. Using the few-layer borophene prepared by our research group as a raw material, a PDMS composite was prepared to verify the terahertz stealth and shielding performance of the few-layer borophene. In the ultra-wide frequency range of 0.1~2.7 THz, the electromagnetic shielding effectiveness (EMI SE) of the PDMS material mixed with few-layer borophene can reach 50 dB, and the reflection loss (RL) can reach 35 dB. With the concentration of few-layer borophene increasing, the terahertz stealth and shielding effectiveness of the material is enhanced. In addition, the simultaneous mixing of few-layer borophene and few-layer graphene will make the material exhibit better terahertz stealth and shielding performance compared with mixing separately.

Wu, Yacong, Jun Huang, Mingxu Yi, and Chaopu Zhang. "Simulation of active cancellation system based on N-order SSC algorithm." Aircraft Engineering and Aerospace Technology 91, no. 7 (July 8, 2019): 949–60. http://dx.doi.org/10.1108/aeat-08-2017-0190.

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Purpose The purpose of this paper is to introduce the theoretical basis of N-order spectral spreading-compressing (SSC) frequency shift interference algorithm and expand it to active cancellation. An active cancellation simulation and verification system based on N-order SSC algorithm is established and carried out; simultaneously, the absorbing material coating stealth simulation of two kinds of thickness is carried out to compare the stealth effect with active cancellation system. Design/methodology/approach The active cancellation method based on N-order SSC algorithm is proposed based on theoretical formula derivation; the active cancellation simulation and verification system is established in MATLAB/Simulink. The full-size model is built by CATIA and meshed by hypermesh. The omnidirectional radar cross section (RCS) is calculated in cadFEKO, and the results are analyzed in postFEKO. Findings The simulations are implemented on a stealth fighter, and results show that after active cancellation, the peak of spectrum analyzer has reduced in all azimuths, the omnidirectional RCS has also decreased and the detection probability of almost all azimuths has dropped under 50 per cent. The absorbing material coating stealth simulations of two kinds of thickness are carried out, and results show that the stealth effect of active cancellation is much better than absorbing material coating. Practical implications An active cancellation system based on SSC algorithm is proposed in this paper, and the effect of active cancellation is verified and compared with that of absorbing materials. A new method for the current active stealth is provided in this paper. Originality/value Active cancellation simulation and verification system is established. RCS calculation module, signal-to-noise-ratio (SNR) calculation module and detection probability module are built to verify the effect of active cancellation system. Simultaneously, the absorbing material coating stealth simulation is carried out, and the stealth effect of absorbing material coating and active cancellation are compared and analyzed.

Irani, Afshad J., and Le (Emily) Xu. "Do stealth restatements convey material information?" Accounting Research Journal 24, no. 1 (July 19, 2011): 5–22. http://dx.doi.org/10.1108/10309611111148751.

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Liu, Hua Wu, Fan Jie Chu, Zong Bin Yang, and Hong Ming Dai. "Igneous Fiber Reinforced Stealthy Armor for Submarine." Advanced Materials Research 332-334 (September 2011): 1955–58. http://dx.doi.org/10.4028/www.scientific.net/amr.332-334.1955.

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Abstract: Igneous gem is a modified mineral glass without devitrification during processing, which is far stronger than traditional basalt materials comprising both glass and crystal phases. Fiber made by igneous gem is an ideal reinforcement for the armor of submarine, with advantages such as infrared stealth (thermal insulation), sonar stealth (anti-vibration), radar stealth (transparent to radar wave), heavy duty anticorrosion, bullet-proof (theoretical tensile strength 15,000MPa), fire resistant (working temperature 910 oC) and ultralow temperature resistant (working temperature up to -269 oC), anti-aging and so on. The corresponding experimental data and mathematical models were demonstrated in this study and compared with other high performance materials. The honeycomb structure was proposed for the prefabricated composite and the advantages of such a material were thoroughly stated.

Xu Wen-Lan, Zhang Shuan-Qin, and Xu Yi. "The design of visible light stealth material." Acta Physica Sinica 53, no. 9 (2004): 3215. http://dx.doi.org/10.7498/aps.53.3215.

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S.P.Mishra, G. Nath, and P. Mishra. "Synthesis and analysis of microwave stealth material." Materials Today: Proceedings 24 (2020): 585–90. http://dx.doi.org/10.1016/j.matpr.2020.04.312.

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Yayun Cheng, Yayun Cheng, Fei Hu Fei Hu, Feng He Feng He, Liang Wu Liang Wu, and and Xiaoqin He and Xiaoqin He. "Millimeter-wave emission characteristics of bilayer radar-infrared compound stealth material." Chinese Optics Letters 14, no. 6 (2016): 062802–62806. http://dx.doi.org/10.3788/col201614.062802.

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Shi, Tao, Zhiheng Zheng, Huan Liu, Dezhen Wu, and Xiaodong Wang. "Configuration of Multifunctional Polyimide/Graphene/Fe3O4 Hybrid Aerogel-Based Phase-Change Composite Films for Electromagnetic and Infrared Bi-Stealth." Nanomaterials 11, no. 11 (November 12, 2021): 3038. http://dx.doi.org/10.3390/nano11113038.

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Electromagnetic (EM) and infrared (IR) stealth play an important role in the development of military technology and the defense industry. This study focused on developing a new type of multifunctional composite film based on polyimide (PI)/graphene/Fe3O4 hybrid aerogel and polyethylene glycol (PEG) as a phase change material (PCM) for EM and IR bi-stealth applications. The composite films were successfully fabricated by constructing a series of PI-based hybrid aerogels containing different contents of graphene nanosheets and Fe3O4 nanoparticles through prepolymerizaton, film casting, freeze-drying, and thermal imidization, followed by loading molten PEG through vacuum impregnation. The construction of PI/graphene/Fe3O4 hybrid aerogel films provides a robust, flexible, and microwave-absorption-functionalized support material for PEG. The resultant multifunctional composite films not only exhibit high microwave absorption effectiveness across a broad frequency range, but also show a good ability to implement thermal management and temperature regulation under a high latent-heat capacity of over 158 J/g. Most of all, the multifunctional composite films present a wideband absorption capability at 7.0–16.5 GHz and a minimum reflection loss of −38.5 dB. This results in excellent EM and IR bi-stealth performance through the effective wideband microwave absorption of graphene/Fe3O4 component and the thermal buffer of PEG. This study offers a new strategy for the design and development of high-performance and lightweight EM–IR bi-stealth materials to meet the requirement of stealth and camouflage applications in military equipment and defense engineering.

Sun, Hui Min, Ming Xue Zhang, and Zhao Zhan Gu. "Study on Radar Absorbing Properties of Impure Sm₂O₃/Acrylate Coatings." Advanced Materials Research 849 (November 2013): 242–47. http://dx.doi.org/10.4028/www.scientific.net/amr.849.242.

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The development and application of the stealth material technology are one of the key factors to develop the stealth technology. The painting type of stealth material has the properties of simply process, usableness and easy regulate, so it has been extensive concern. In the paper the impure Sm2O3/acrylate coatings were prepared using Sm2O3 and carbon nanotubes powder and their microstructure was studied by SEM. Furthermore it was studied on radar absorption properties in 1-18GHz and mechanics properties of the coatings. It is proved that the absorption effect of the coatings is the best when the thickness coating is 1.2mm and its solid dosage is 50wt%. Meanwhile mechanics properties of the films are very good.

Більше джерел

Дисертації з теми "Stealth material":

Chamaillard, Mathieu. "Effective boundary conditions for thin periodic coatings." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLY001.

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Nous avons traité le cas de l'équation scalaire de Helmholtz. Nous allons tenter de traiter le cas des équations de Maxwell. On s'intéressera aux cas des méta-matériaux. Dans un premier cas la permittivité est négative dans la couche mince et dans le deuxième cas la perméabilité est en (1/delta)^2
We have dealt with the case of the scalar Helmholtz equation. We will try to handle the case of Maxwell's equation. We also will focus on the case of meta-materials. In a first case the permittivity is negative in the thin layer and in the second case is the permeability (1/delta) ^ 2

Lepert, Guillaume. "Étude des interactions élasto-acoustiques dans des métamatériaux formés d'inclusions résonnantes réparties aléatoirement." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00946591.

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La discrétion acoustique est un enjeu majeur dans le domaine de la défense navale. Dans ce contexte, DCNS Research souhaite évaluer la capacité des métamatériaux acoustiques aléatoires localement résonnants à constituer une rupture technologique, comparativement aux matériaux anéchoïques actuels. Nous nous proposons de dimensionner, suite à une étude paramétrique conséquente, des structures contenant une répartition aléatoire d'inclusions sphériques. Des échantillons de matériaux localement résonnants ont été fabriqués. Leur réponse acoustique a été mesurée et confrontée aux prédictions issues de modèle. L'impact des résonances des inclusions et de l'angle d'incidence a été mis en évidence. Enfin, une méthode d'identification de leurs propriétés effectives a été développée à partir de mesures en réflexion et en transmission. Elle repose sur une configuration expérimentale originale. Des difficultés liées à l'extraction de la masse volumique dynamique sont mises en exergue.

Chien, Hsin-Yi, and 簡欣怡. "Preparation of dendrimer / metal nanocomposites for compatible stealth materials between radar and infrared region." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/88806505285506064637.

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"Metasurface-Based Techniques for Broadband Radar Cross-Section Reduction of Complex Structures." Doctoral diss., 2020. http://hdl.handle.net/2286/R.I.62941.

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abstract: Within the past two decades, metasurfaces, with their unique ability to tailor the wavefront, have attracted scientific attention. Along with many other research areas, RADAR cross-section (RCS)-reduction techniques have also benefited from metasurface technology. In this dissertation, a novel technique to synthesize the RCS-reduction metasurfaces is presented. This technique unifies the two most widely studied and two well-established modern RCS-reduction methods: checkerboard RCS-reduction andgradient-index RCS-reduction. It also overcomes the limitations associated with these RCS-reduction methods. It synthesizes the RCS-reduction metasurfaces, which can be juxtaposed with almost any existing metasurface, to reduce its RCS. The proposed technique is fundamentally based on scattering cancellation. Finally, an example of the RCS-reduction metasurface has been synthesized and introduced to reduce the RCS of an existing high-gain metasurface ground plane. After that, various ways of obtaining ultrabroadband RCS-reduction using the same technique are proposed, which overcome the fundamental limitation of the conventional checkerboard metasurfaces, where the reflection phase difference of (180+-37) degrees is required to achieve 10-dB RCS reduction. First, the guideline on how to select Artificial Magnetic Conductors (AMCs) is explained with an example of a blended checkerboard architecture where a 10-dB RCS reduction is observed over 83% of the bandwidth. Further, by modifying the architecture of the blended checkerboard metasurface, the 10-dB RCS reduction bandwidth increased to 91% fractional bandwidth. All the proposed architectures are validated using measured data for fabricated prototypes. Critical steps for designing the ultrabroadband RCS reduction checkerboard surface are summarized. Finally, a broadband technique to reduce the RCS of complex targets is presented. By using the proposed technique, the problem of reducing the RCS contribution from such multiple-bounces simplifies to identifying and implementing a set of orthogonal functions. Robust guidelines for avoiding grating lobes are provided using array theory. The 90 degree dihedral corner is used to verify the proposed technique. Measurements are reported for a fabricated prototype, where a 70% RCS-reduction bandwidth is observed. To generalize the method, a 45 degree dihedral corner, with a quadruple-bounce mechanism, is considered. Generalized guidelines are summarized and applied to reduce the RCS of complex targets using the proposed method.
Dissertation/Thesis
Doctoral Dissertation Electrical Engineering 2020

Книги з теми "Stealth material":

Skorupa, John A. Self-protective measures to enhance airlift operations in hostile environments. 5th ed. Maxwell Air Force Base: Air University Press, 2004.

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Sun, Min, and Mingxun Yu. Yin shen cai liao ji shu: Yinshen Cailiao Jishu. 8th ed. Beijing: Guo fang gong ye chu ban she, 2013.

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Gershman, Eric W. 400 steals beyond belief: The essential almanac to a freer world. Boston, MA: Financial Answers Network, 1996.

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1938-, Earnest Don, and Reader's Digest Association, eds. Free money, free stuff: The select guide to public and private deals, steals and giveaways. Pleasantville, N.Y: Reader's Digest Association, 2007.

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Trombetta, Jack. Material Evidence: Who would want to steal a corpse and Why? Tate Publishing & Enterprises, LLC, 2008.

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Association, Reader's Digest. Free Money Free Stuff the Select Guide to Public and Private Deals, Steals & Giveawaya (Includes Special Programs for Seniors, Veterans, Teacher, New Mothers, & More). Reader's Digest, 2007.

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Schrijver, Karel. Drifting Through a Planetary System. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198799894.003.0006.

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This chapter describes how the first found exoplanets presented puzzles: they orbited where they should not have formed or where they could not have survived the death of their stars. The Solar System had its own puzzles to add: Mars is smaller than expected, while Venus, Earth, and Mars had more water—at least at one time—than could be understood. This chapter shows how astronomers worked through the combination of these puzzles: now we appreciate that planets can change their orbits, scatter water-bearing asteroids about, steal material from growing planets, or team up with other planets to stabilize their future. The special history of Jupiter and Saturn as a pair bringing both destruction and water to Earth emerged from the study of seventeenth-century resonant clocks, from the water contents of asteroids, and from experiments with supercomputers imposing the laws of physics on virtual worlds.

Частини книг з теми "Stealth material":

Kumar, N., and S. R. Vadera. "Stealth Materials and Technology for Airborne Systems." In Aerospace Materials and Material Technologies, 519–37. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2134-3_24.

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Zohuri, Bahman. "Radar-Absorbent Material and Radar Cross Section." In Radar Energy Warfare and the Challenges of Stealth Technology, 147–203. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-40619-6_3.

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Dutta, Amarjeet, Shubham Srivastava, Ritesh Goel, and C. S. Malvi. "Progresses in Infrared Stealth Composites." In Tailored Functional Materials, 379–96. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2572-6_29.

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Baskey, Himanshu B., Alok Kr Dixit, Krishna Kr Gupta, Ashish Dubey, S. M. Abbas, T. C. Shami, and Eswara Prasad Namburi. "Functional Materials for Stealth and Camouflage Applications." In Novel Defence Functional and Engineering Materials (NDFEM) Volume 2, 287–322. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-9795-4_10.

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Xu, Y. G., K. Fan, X. B. Wang, W. Gao, and Y. Zhang. "Research on equivalent construction technology of stealth coating in RCS measurement." In Advances in Materials Science and Engineering, 589–94. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003225850-88.

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Pollayi, Hemaraju, and Praveena Rao. "Stealth Carbon Nano-tubes (S-CNTs): AI/ML Based Modeling of Nano-structured Composites for Attenuation and Shielding in Aircraft." In Springer Proceedings in Materials, 425–42. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-5567-1_31.

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"Material Gains: Conducting Class Politics by Stealth (1979–84)." In The Thatcherite Offensive, 124–63. BRILL, 2016. http://dx.doi.org/10.1163/9789004292215_008.

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"From Poison to Prison." In Poisons and Poisonings: Death by Stealth, 184–213. The Royal Society of Chemistry, 2016. http://dx.doi.org/10.1039/bk9781782627173-00184.

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Examination of dead bodies is carried out to establish the circumstances of death. A human corpse is totally biodegradable and the processes by which it degrades begin within hours of death. The degradation eventually results in the corpse being broken down into simple compounds. Any poison present in the body may change due to the influence of the body's decomposition reactions and the chemistry of the environment around the body. All of this must be considered in the search for material evidence.

Liu, Chunying, Xuejing Lin, and Changqing Su. "Extracellular Vesicles: “Stealth Transport Aircrafts” for Drugs." In Theranostics - An Old Concept in New Clothing [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94502.

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Extracellular vesicles (EVs) can deliver many types of drugs with their natural source material transport properties, inherent long-term blood circulation capabilities and excellent biocompatibility, and have great potential in the field of drug carrier. Modification of the content and surface of EVs according to the purpose of treatment has become a research focus to improve the drug load and the targeting of EVs. EVs can maximize the stability of the drugs, prevent immune clearance and achieve accurate delivery. Therefore, EVs can be described as \" stealth transport aircrafts \" for drugs. This chapter will respectively introduce the application of natural EVs as cell substitutes in cell therapy and engineered EVs as carriers of nucleic acids, proteins, small molecule drugs and therapeutic viral particles in disease treatment. It will also explain the drug loading and modification strategies of EVs, the source and characteristics of EVs. In addition, the commercialization progress of EVs drugs will be mentioned here, and the problems in their applications will be discussed in conjunction with the application of EVs in the treatment of COVID-19.

Zivieri, Roberto, Giulia Palomba, Giancarlo Consolo, and Vincenzo Crupi. "Magnetic Signature Analysis of the Propulsor of a Military Ship." In Progress in Marine Science and Technology. IOS Press, 2023. http://dx.doi.org/10.3233/pmst230015.

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The analysis of magnetic signature and the consequent identification of mitigation strategies are crucial issues in naval applications. The possibility to evaluate the magnetic signature of some essential components and structures during the design phase, represents an interesting opportunity to enhance ship design in terms of stealth capabilities. The current paper focuses on the assessment of the magnetic signature produced by a propulsor from a military ship with a fiberglass hull. The propulsor largest and heaviest components, which contribute most to the MS, were considered in the analysis. The numerical analysis carried out by means of a finite-element method technique was based on a simple theoretical model involving the concepts of averaged magnetization and of averaged permeability. The developed investigation is aimed at comparing the magnetic signature of a traditional propulsor with the one achievable by replacing the original ferromagnetic materials with weakly ferromagnetic ones and with a non-magnetic material, such as Aluminum, in the coating of the electric motor. The magnetic signature produced in the underwater region nearby the propulsor is consistently reduced and it is proved that the effect of Aluminum used in place of Cast iron is remarkable in determining this reduction. Therefore, the selection of suitable materials for the most critical parts in terms of magnetization and permeability, represents an effective yet simple strategy to improve the stealth properties of military ships. The possibility to use a simple model to evaluate the magnetic signature during the design phase is, therefore, essential to support a convenient selection of materials.

Тези доповідей конференцій з теми "Stealth material":

"Scattering of Stealth-material Objects Illuminated by OAM Beams." In WCSE 2022 Spring Event: 2022 9th International Conference on Industrial Engineering and Applications. WCSE, 2022. http://dx.doi.org/10.18178/wcse.2022.04.118.

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Verma, Anshika, Shailza Gotra, Dharmendra Singh, and G. D. Varma. "Tunable Magnetic Material based Composite Microwave Absorber for Stealth Applications." In 2023 IEEE Wireless Antenna and Microwave Symposium (WAMS). IEEE, 2023. http://dx.doi.org/10.1109/wams57261.2023.10242887.

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Hu, Haitao, Jiaming Shi, and Ruihuang Liu. "Study on a new type of green infrared stealth film material." In Optical Sensing and Imaging Technology and Application, edited by Dong Liu, Haimei Gong, Mircea Guina, and Jin Lu. SPIE, 2018. http://dx.doi.org/10.1117/12.2505540.

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Zhao, Jingbo, Hong Yao, Jun Du, Yijing Liu, Jiulong Jiang, and Yake Dong. "A New Invisible Cloak with Broad Stealth Angle Based on Isotropic Material." In International Conference on Education, Management, Computer and Society. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/emcs-16.2016.3.

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H, ZHANG, ZHANG Z. K, BAO J. W, and WANG Y. W. "Study on Stealth Bulletproof Integrated Composite Material Based on Multi-layer Resistance Film." In 2020 6th Global Electromagnetic Compatibility Conference (GEMCCON). IEEE, 2020. http://dx.doi.org/10.1109/gemccon50979.2020.9456692.

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Sharma, Ayush, Sudheendra S. Kulkarni, and Udaykumar V. Khadke. "Ferroelectric polymer composite as radio absorbing material (RAM) for 5th generation stealth fighter aircraft." In INTERNATIONAL CONFERENCE ON MULTIFUNCTIONAL MATERIALS (ICMM-2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0019654.

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Ashraf, Rezwan, Syeda Tahrin Tabassum, Ragib Tahmid, and Mohammed Hossam-E-Haider. "Performance Analysis of Radar Cross Section for F-117 Nighthawk Stealth Aircraft over Frequency and Aspect Angle." In 2018 International Conference on Computer, Communication, Chemical, Material and Electronic Engineering (IC4ME2). IEEE, 2018. http://dx.doi.org/10.1109/ic4me2.2018.8465587.

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Hsu, Ching Yu, Chia Chin Chiang, Guang Min Luo, Ya Hui Chen, and Fu Cheng Chu. "Analysis of Ship Structure with GFRP Lamination Design Subjected to Underwater Shock Loading." In The 11th Asia Conference on Mechanical and Materials Engineering. Switzerland: Trans Tech Publications Ltd, 2024. http://dx.doi.org/10.4028/p-aflx8d.

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FRP composite materials are still being continuously developed and researched, because FRP composite materials are non-magnetic and have good wave permeability, which can effectively achieve stealth and reduce the chance of being attacked. The underwater explosion impact of warships is a severe high-strain rate response. At present, most of the structural response simulations of underwater explosions are simulated with static material parameters. The static material parameters and dynamic material parameters in the tensile direction are obtained through the MTS material testing machine and the Hopkinson bar, and the other direction material parameters are obtained with Compose IT developed by BV certification. The results show that under the dynamic material parameters of LT800/M225 composite material with high strain rate, the stress and strain are both higher than those of the static test, and the stress-strain curves also have obvious differences in trends. Obtain the static and dynamic material parameters of LT800/M225, use ABAQUS to simulate the underwater explosion of the simplified ship model, and use the Tsai-Hill failure criterion to judge the material damage. The research results show that the failure time of the static or dynamic material parameters is similar, but the strain response of the dynamic material parameter simulation is more obvious than that of the static material parameter analysis. The research results of this paper can be used as a reference for subsequent research by composite material structure designers.

Şentürk, Berkant, and Hüsnügül Yılmaz Atay. "Production of Radar Absorbing Composite Materials Using Carbon Nanotubes." In 6th International Students Science Congress. Izmir International Guest Student Association, 2022. http://dx.doi.org/10.52460/issc.2022.046.

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In order to increase the combat effectiveness of any platform or long-range munition in use today, it is necessary to reduce its visibility to radar. In this sense, important development in radar systems started after World War II. The interaction between electromagnetic waves at radar frequencies and different materials was investigated, electromagnetic radiation absorption mechanism; it has been observed that the materials consist of electrical, magnetic and dielectric properties. In line with this information, radar absorbing material design studies gained momentum. A significant development in radar systems of stealth technology made radar absorbing materials RAMs gaining a long-standing interest as a possible way to disguise aircrafts and submarines from radar systems. Carbon nanotubes and magnetic materials such as Fe, Ni, and Co have attracted researchers' significant interest as radar absorbers. In recent years, numerous studies have been made using carbon nanotubes due to their unique properties. However, few studies have considered the influence of both particle size and weight fraction. This work aims to produce material with unique properties such as solid absorption, low weight/thickness, and cost-effective, minimizing the reflection of electromagnetic waves using a polymeric composite structure reinforced with carbon nanotubes. Carbon nanotubes with different particles sizes of 8 nm,18 nm, and 78 nm were mixed with polyester in different weight fractions of 1%, 2%, and 3%. Three different composites structures were prepared in single, double, and three layers. Composites were characterized using XRD, SEM, and network analyzer in the frequency range of 8 to12 GHz. According to the results, it was observed that radar absorption increased with the increase in grain size, but the number of layers had no linear effect on the results. Network analyzer results show that the minimum reflection loss value at 9.9 GHz with a thickness of 1.5 mm is −33.1 dB, and the effective bandwidth is 9.9 GHz. Multi-layer carbon nanotubes composites might be a potential radar absorber because of their flexibility to adjust their absorption band to fit different applications in different frequency bands by modifying their particle sizes and weight.

Yao, Guozheng, and Ying Liu. "Visible stealth materials based on photonic crystals." In 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), edited by Tianchun Ye, A. G. Poleshchuk, and Song Hu. SPIE, 2014. http://dx.doi.org/10.1117/12.2069716.

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Звіти організацій з теми "Stealth material":

Gac, F. D., A. T. Jr Young, and A. Migliori. Technical evaluation of Russian aircraft stealth coating and structural materials. Office of Scientific and Technical Information (OSTI), October 1996. http://dx.doi.org/10.2172/383652.

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Perdigão, Rui A. P. Triadic Flight Technologies. Synergistic Manifolds, March 2024. http://dx.doi.org/10.46337/240307.

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A novel triadic suite of flight technologies is introduced by developing, articulating and integrating ground-effect, free amphibian flight and orbital flight capabilities into a triadic system-of-systems able to seamlessly operate across all three mobility paradigms. The triad is then implemented onto our new purpose-designed hydro-aerospace vehicle, propelled by latest-generation micro-reactors for industry-leading aerospace thrust, whilst providing long-range carbon-free flight mobility and autonomy. The vehicle structure and materials are further optimized for a seamless switch between standard and stealth operations, while also providing structural robustness and functional flexibility to safely carry and deploy heavy and highly reactive payloads. The robustness and versatility of the new vehicle is demonstrated across a suite of challenging oceanic and aerospace theaters of operation. Special emphasis is given to search and rescue missions, along with surveillance and security operations involving multidomain flight segments and highlighting seamless cross-domain transitions.

Khomenko, Tetiana, та Yuriy Kolisnyk. Втрати української культури у російсько-українській війні: культурно-інформаційний спротив. Ivan Franko National University of Lviv, березень 2023. http://dx.doi.org/10.30970/vjo.2023.52-53.11749.

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The authors explored the activity of mass media and cultural organizations aimed at clarification of the current problematic issue – preservation of Ukrainian cultural heritage under the conditions of the full-scale invasion of Russia into Ukraine. The authors emphasize that occupants not only destroy historic buildings, i.e. material objects, but also steal art values, destroy library and archive funds; their actions are aimed at destruction of our spirituality, identity and history. It is pointed out that there are the main streams in the work of journalists, experts, and culture figures, namely: fixation of losses, propaganda of the Ukrainian culture in the world, expert evaluation of the restitution possibilities, and filling of the culture material with patriotic sense. The full-scale invasion of Russia into Ukraine on the 24th of February 2022 led to the numerous loss of life, ruination of the military, civil and infrastructure objects. But the state-aggressor destroys and robs our culture in this war. Since the beginning of the war mass media have been actively informing about the situation in the regions, which happened to be at the line of the Russian troops attack. The information was in particular about the fact that different educational establishments, libraries and their funds, museums with valuable collections, theatres, religious buildings and historic buildings had been ruined. To tell the truth the information was incomplete due to the limited opportunities to monitor the situation. However, later it has been systematized. The work of journalists and experts contributed to this since they stated the criminal acts of Russia, informing about the ruination facts of historic, sacral, cultural monuments, devastation of many museum collections, destruction of library and archive funds. Digitalization of the Russian war crimes against Ukrainian culture became one more important work aimed at preservation of the Ukrainian cultural heritage. It was done by means of interactive maps of the Ukrainian cultural losses and it enables documenting crimes of the occupant army and spreading this information at the international level. Key words: culture, cultural front, cultural losses, cultural values, cultural heritage, war, media.