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Автор: Grafiati

Опубліковано: 7 липня 2024

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1

Sun, Hui Min, Le Chen, and Zhao Zhan Gu. "Characterization and Design of Honeycomb Absorbing Materials." Solid State Phenomena 294 (July 2019): 51–56. http://dx.doi.org/10.4028/www.scientific.net/ssp.294.51.

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Honeycomb absorbing materials are anisotropic structural materials. Depending on the size of honeycomb lattices, the absorbent content of the impregnated layer is different, the thickness of the impregnated layer is different, and the absorbing function of the impregnated honeycomb absorbing materials is also different. For the characterization of electromagnetic parameters of honeycomb absorbing materials, this paper adopts free space method for testing, uses CST software for modeling, and inverts the electromagnetic parameters of honeycomb absorbing structures. The absorbing performance of single-layer and double-layer honeycomb sandwich structures was simulated by RAM Optimizer software. The research shows that the height of the single-layer honeycomb absorbing material is 22mm. When the absorber content is 65%, 75% and 85% respectively, the harmonic peak moves slightly to the low frequency electromagnetic wave with the increase of the absorber content, but the absorbing strength decreases with the increase of the absorber content. For the double-layer honeycomb sandwich structure, the difference of absorber content in the upper and lower honeycomb absorbing materials is smaller, and the absorbing performance is stronger. When the thickness of the wave-transparent panel is thinner, the harmonic peak of the absorbing curve moves slightly to the high frequency.

2

Yu, Zhang. "Research on Absorbing Properties of New Porous Metals Materials with Light Weight." Key Engineering Materials 815 (August 2019): 42–47. http://dx.doi.org/10.4028/www.scientific.net/kem.815.42.

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The development of electronic science technology makes electromag-netic radiation problems increasingly severe. High-performance absorbing and shielding electromagnetic wave materials with light weight are researched and developed as one of effectiveness methods to restrain electromagnetic radiation and prevent information leakage. The absorbing properties of aluminium foams coating absorbing paint were studied and tested by making use of RCS in “the reflectivity testing measurement of radar absorbing material” of GJB 2038-94 in this work. The effect of absorbent species and metal base structure on absorbing properties of materials was discussed. The results indicate that the absorbing properties of materials coating magnetic dielectric absorbing paint are better than others, and that of the sample CFe are best in 12.0—18.0GHz, while that of the sample CNi’ are optimal in 26.5—40.0GHz; comparing with aluminium alloy plate materials, aluminium alloy foams have some absorbing properties, and after coating absorbing paint, absorbing properties’ improvement of aluminium foams are larger than of aluminium alloy plate that were resulted from complex porous structure mainly of aluminium foams’.

3

Zheng, Wei, Wenxian Ye, Pingan Yang, Dashuang Wang, Yuting Xiong, Zhiyong Liu, Jindong Qi, and Yuxin Zhang. "Recent Progress in Iron-Based Microwave Absorbing Composites: A Review and Prospective." Molecules 27, no. 13 (June 27, 2022): 4117. http://dx.doi.org/10.3390/molecules27134117.

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With the rapid development of communication technology in civil and military fields, the problem of electromagnetic radiation pollution caused by the electromagnetic wave becomes particularly prominent and brings great harm. It is urgent to explore efficient electromagnetic wave absorption materials to solve the problem of electromagnetic radiation pollution. Therefore, various absorbing materials have developed rapidly. Among them, iron (Fe) magnetic absorbent particle material with superior magnetic properties, high Snoek’s cut-off frequency, saturation magnetization and Curie temperature, which shows excellent electromagnetic wave loss ability, are kinds of promising absorbing material. However, ferromagnetic particles have the disadvantages of poor impedance matching, easy oxidation, high density, and strong skin effect. In general, the two strategies of morphological structure design and multi-component material composite are utilized to improve the microwave absorption performance of Fe-based magnetic absorbent. Therefore, Fe-based microwave absorbing materials have been widely studied in microwave absorption. In this review, through the summary of the reports on Fe-based electromagnetic absorbing materials in recent years, the research progress of Fe-based absorbing materials is reviewed, and the preparation methods, absorbing properties and absorbing mechanisms of iron-based absorbing materials are discussed in detail from the aspects of different morphologies of Fe and Fe-based composite absorbers. Meanwhile, the future development direction of Fe-based absorbing materials is also prospected, providing a reference for the research and development of efficient electromagnetic wave absorbing materials with strong absorption performance, frequency bandwidth, light weight and thin thickness.

4

Singh, Dharmendra. "Microwave Absorbing Materials." Defence Science Journal 71, no. 03 (May 17, 2021): 351. http://dx.doi.org/10.14429/dsj.71.17005.

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The 4th Prof. Vijaya Agarwala Memorial National Symposium on Microwave Absorbing Materials (VAMMAM-2020)” was held during 23 - 24th, August 2020 at Indian Institute of Technology Roorkee in association with Centre of Nanotechnology and Common Research Technology Development Hub (CRTDH) for New Materials/Stealth Applications and Department of Applied Mechanics Motilal Nehru National Institute of Technology Allahabad, Prayagraj, India.

5

Saeed, Fatma S., Ahmed S. Elkorany, Adel A. Saleeb, and Elsayed E. Rabaie. "Electromagnetic Absorbing Materials." Menoufia Journal of Electronic Engineering Research 30, no. 1 (January 1, 2021): 125–29. http://dx.doi.org/10.21608/mjeer.2021.146298.

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6

Morimoto, Toru. "Sound absorbing materials." Journal of the Acoustical Society of America 94, no. 5 (November 1993): 3037. http://dx.doi.org/10.1121/1.407304.

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7

Sun, Hui Min, Zhao Zhan Gu, and Ran Ran Yang. "Study on Absorbing Properties of Honeycomb Absorbing Materials." Advanced Materials Research 815 (October 2013): 645–49. http://dx.doi.org/10.4028/www.scientific.net/amr.815.645.

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Honeycomb absorbing materials were measured using the method of free space in this paper. The reflectance of honeycomb absorbing materials was calculated and simulated, and it was verified based on the measured results. It was demonstrated that this test method was feasible. Through studying on absorbing properties of honeycomb, the results have showed that the radar absorbing properties of honeycomb are related to electromagnetic parameters, as well as thickness of the dip-coatings. With the increase of thickness of the dipping layer, the radar absorbing capability of high frequency and low frequency wave are significantly increased. It is worth noting that the resonance peak moved to the low frequency with the increase of dipping layer thickness. These results are useful for design of honeycomb absorbing materials.

8

Kazama, Shigenori. "Novel sound absorbing materials." Journal of the Acoustical Society of America 96, no. 3 (September 1994): 1947. http://dx.doi.org/10.1121/1.410175.

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9

Poplavko, Yuriy, Dmytro Tatarchuk, Yurii Didenko, and Dmytro Chypegin. "Microwave Absorbing Composite Materials." Radioelectronics and Communications Systems 66, no. 1 (January 2023): 23–32. http://dx.doi.org/10.3103/s0735272723010065.

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10

Zhang, Yu, Jian Ming Wang, and Tian Guo Zhou. "Effect of Doping Cerium Oxide on Microwave Absorbing Properties of Polyaniline/Al-Alloy Foams Composite Materials." Advanced Materials Research 893 (February 2014): 295–98. http://dx.doi.org/10.4028/www.scientific.net/amr.893.295.

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To study the effect of doping cerium oxide on the microwave absorbing properties of Polyaniline /Al-alloy foams, the surface of Al-alloy foams was coated with Polyaniline (denoted by CfP),and doping 1%, 2%,5% (mass percent) cerium oxide (denoted by CfP1,CfP2,CfP5) of Polyaniline respectively. The coated Al-alloy foams were tested according to the Standard GJB 2038-94 Method to test the reflectivity of radar absorbing materials, i.e., the RCS (radar cross-section) method. The morphology and distribution of microwave absorbent were analyzed by scanning electron microscopy (SEM) and X-Ray Diffractomer (XRD).The absorbing properties of each example under different wave band were discussed. The results indicated that in the 12~18GHz and 26.5~40GHz bands the absorbing properties increase with the increase of frequency, and after doping the rare earth oxide, the absorbability of the composite material was enhanced.

11

Pratiwi, Radhiyah Ulfah, Anugrah Sabdono Sudarsono, Zaenal Muttaqin, and Supriyanto Supriyanto. "OPTIMIZING THE ACOUSTIC CONDITION OF A PYRAMIDAL-CEILING MOSQUE BASED ON SIMULATION." Journal of Islamic Architecture 7, no. 4 (December 30, 2023): 713–18. http://dx.doi.org/10.18860/jia.v7i4.19638.

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This study aims to optimize the acoustic condition of a pyramidal ceiling mosque utilizing a simulation approach. The simulation was done using I-Simpa, simulating the room acoustic parameters of 15 m x 15 m x 5 m and a 5 m roof height of a mosque. The optimization was accomplished by varying the occupancy level and using absorbent materials. The best acoustic condition was defined as having a high level of speech intelligibility (C-50 > -2 dB) yet the longest possible reverberation time, especially at 500-4000 Hz. The simulation indicates that the speech intelligibility value increases with the number of filled rows, both with and without sound-absorbing material. On the other hand, the reverberation time is unaffected by the number of filled rows and is extended by using sound-absorbing materials. Hence, without sound-absorbing ceiling material, optimal conditions are attained when the mosque is fully occupied. Meanwhile, using sound-absorbing materials on the mosque's ceiling establishes optimal acoustic conditions for all occupancy levels. It demonstrates that using sound-absorbing materials improves the acoustic quality of the pyramidal-ceiling mosque.

12

Fang, Zhi Gang, and Chun Fang. "Novel Radar Absorbing Materials with Broad Absorbing Band: Carbon Foams." Applied Mechanics and Materials 26-28 (June 2010): 246–49. http://dx.doi.org/10.4028/www.scientific.net/amm.26-28.246.

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Carbon foams were prepared by a polymer sponge replication method and their microwave absorbing properties were investigated in this paper. It was found that the electric conductivity of carbon foams increases quickly with the improvement of carbonization temperatures. Moreover, the electric conductivity of carbon foams strongly affects their microwave absorbing performances. As the electric conductivity increases from 0.02 S/m to 1.03 S/m, the dominant electromagnetic behavior of carbon foams changes from transmission to reflection with regard to the incident electromagnetic wave. The best microwave absorbing performance was achieved for the carbon foam with an electric conductivity of 0.46S/m when other parameters are fixed at constants, and absorbing values for the carbon foam exceeds 7dB almost in the whole measured frequency range of 4-15GHz, while the frequencies range for absorbing values exceeding 8dB are about 7 GHz, demonstrating a characteristic of broad absorbing bandwidth. It is to be noted that the absorbing characteristic for the carbon foam with an electric conductivity of 0.46S/m is obtained without any impedance match design, which indicates that carbon foams have the possibility to be applied as broad absorbing bandwidth RAMs.

13

Yang, Zenghui, Haihua Wu, Renjing Zhang, Kaixin Deng, Yan Li, Zhi Liu, Qiang Zhong, and Yi Kang. "Effect of Graphene/Spherical Graphite Ratio on the Properties of PLA/TPU Composites." Polymers 14, no. 13 (June 22, 2022): 2538. http://dx.doi.org/10.3390/polym14132538.

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Wave-absorbing materials are developing in the direction of “light weight, wide frequency band, thin layer and high strength”, and it is difficult to achieve the synergy between wave-absorbing performance and mechanical properties when graphene absorbent is compounded with a single resin matrix. In this paper, based on the preparation of a new composite absorbing wire with a graphene (GR)/spherical graphite (SG) double absorbent and polylactic acid (PLA)/thermoplastic polyurethane (TPU) double matrix, we proposed a new method to prepare samples for testing the electromagnetic parameters and tensile strength by fused deposition modeling (FDM). Furthermore, the effect of SG/GR ratio on the microwave absorbing properties and mechanical properties of PLA/TPU composites was specifically studied. It was found that when the ratio of SG/GR was small (0:5, 1:4), the dielectric loss (interfacial polarization loss, dipole polarization loss, conductivity loss) and attenuation ability of the composites were stronger, and the impedance matching was better. When the SG/GR ratio was large (5:0, 4:1), the composites had high strength and toughness. When the ratio of SG/GR was moderate (2:3, 3:2), it could retain the absorbing and mechanical properties of the absorbing materials. On the one hand, the SG and PLA/TPU matrix formed an “island structure”, which improves the dispersion of GR; on the other hand, the GR and PLA/TPU matrix formed a “core-shell structure”, which promotes polarization and multiple scattering.

14

Shashkeev, K. A., E. M. Shuldeshov, O. V. Popkov, I. D. Kraev, and G. Yu Yurkov. "Porous sound-absorbing materials (review)." Proceedings of VIAM, no. 6 (2016): 6. http://dx.doi.org/10.18577/2307-6046-2016-0-6-6-6.

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15

Juan I. Larruquert, Juan I. Larruquert, Manuela Vidal-Dasilva Manuela Vidal-Dasilva, Sergio García-Cortés Sergio Garca-Cortes, Mónica Fernández-Perea Monica Fernandez-Perea, José A. Méndez Jose A. Mendez, and and José A. Aznárez Jose A. Aznarez. "Constructing multilayers with absorbing materials." Chinese Optics Letters 8, S1 (2010): 159–62. http://dx.doi.org/10.3788/col201008s1.0159.

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16

Shtarkova, R., and N. Dishovsky. "Elastomer-based Microwave Absorbing Materials." Journal of Elastomers & Plastics 41, no. 2 (March 2009): 163–74. http://dx.doi.org/10.1177/0095244308092439.

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17

Morimoto, Toro. "Membranous-vibration sound absorbing materials." Journal of the Acoustical Society of America 101, no. 1 (January 1997): 21. http://dx.doi.org/10.1121/1.418258.

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18

Kirillov, V. Yu, P. A. Zhukov, S. Yu Zhuravlev, and M. M. Tomilin. "Radar-Absorbing Materials for Spacecraft." Cosmic Research 58, no. 5 (September 2020): 372–78. http://dx.doi.org/10.1134/s0010952520050068.

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19

Sagartzazu, X., L. Hervella-Nieto, and J. M. Pagalday. "Review in Sound Absorbing Materials." Archives of Computational Methods in Engineering 15, no. 3 (May 8, 2008): 311–42. http://dx.doi.org/10.1007/s11831-008-9022-1.

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20

Wang, Z. Y., J. Zhang, X. Wu, Maria Birau, Guomin Yu, Hongan Yu, Y. Qi, et al. "Near-infrared absorbing organic materials." Pure and Applied Chemistry 76, no. 7-8 (January 1, 2004): 1435–43. http://dx.doi.org/10.1351/pac200476071435.

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Organic solids and polymers that absorb in the near-infrared (NIR) region (1000–2000 nm) represent a class of emerging materials and show a great potential for use in photonics and telecommunications. The radical anions of stacked aromatic imides, fused phorphyrin arrays, polythiophenes, sandwich-type lanthanide bisphthalocyanines, semiquinones, and mixed-valence dinuclear metal complexes are a few known examples of NIR-absorbing organic materials. Most of these NIR-absorbing materials are also electro- chemically active or electrochromic (EC). This brief review covers several types of NIR-absorbing organic materials and discusses their potential for applications in EC variable optical attenuators (VOAs).

21

Gverdtsiteli, I. G., Sh P. Abramidze, A. G. Kalandarishvili, G. S. Karumidze, and V. A. Kuchukhidze. "Gas evolution from absorbing materials." Soviet Atomic Energy 59, no. 3 (September 1985): 736–40. http://dx.doi.org/10.1007/bf01128066.

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22

Wei, Dong Ming, Hong Bo Zheng, and Shu Shen Zhang. "The Capacities Evaluation of Oil Absorption Materials." Applied Mechanics and Materials 535 (February 2014): 666–70. http://dx.doi.org/10.4028/www.scientific.net/amm.535.666.

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Nowadays, more and more oil-absorbing materials are researched, but lacking of an effective index system to evaluate capacities of oil-absorbing materials. In this paper, combining analytic hierarchy process (AHP) and comprehensive evaluation method, an effective evaluation model will be established and be verified used the evaluate the capacities evaluation of three typical oil-absorbing materials (polypropylene linoleum absorption (PP-2), straw and polyurethane linoleum absorption (PU-1)) absorbing 20# lubricating oil in water environment as a case. The comprehensive evaluation results showed the final score of PP-2, straw and PU-1 were 7.42, 5.86 and 7.16, respectively, and PP-2 was the best oil-absorbing materials, which is consistent with the conclusions of the research.

23

Gao, Cheng, Yangsheng Jiang, Dayong Cai, Jinyong Xu, and Weiyao Xiao. "Effect of Temperature on the Microwave-Absorbing Properties of an Al2O3–MoSi2 Coating Mixed with Copper." Coatings 11, no. 8 (August 5, 2021): 940. http://dx.doi.org/10.3390/coatings11080940.

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To obtain a high temperature-resistant microwave absorbing coating, an Al2O3–MoSi2/Cu composite coating was prepared by atmospheric plasma spraying. Compared with a normal temperature environment, there are a few reports on Cu as an absorbent for high temperature microwave absorbing coatings. Therefore, in this regard, wave absorbing property can be improved by using a Cu absorbent. The microstructure of a Al2O3–MoSi2/Cu coating was observed, and the dielectric properties of the composite coating in the high-temperature environment of the X-band were tested. The experimental results show that with the increase in temperature, Cu transforms Cu2O in the high-temperature environment and improves the coating’s wave absorption performance with MoSi2. In addition, a 1.4 mm-thick coating showed best microwave absorbing performance at 700 °C. The reflection loss was −19.09 dB, and the effective microwave absorbing bandwidth was 2.83 GHz (Reflection Loss < −10 dB). It was found that the Al2O3–MoSi2/Cu composite coating has good wave-absorbing performance in a 700 °C high-temperature environment.

24

Zhang, Yuefang, Shunhua Liu, and wanJun Hao. "Microwave absorption and mechanical properties of double-layer cement-based composites containing different replacement levels of fly ash." Science and Engineering of Composite Materials 25, no. 4 (July 26, 2018): 707–14. http://dx.doi.org/10.1515/secm-2016-0325.

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Abstract Double-layer absorbing cement-based composites with the thickness of 10 mm were prepared, including different replacement levels of fly ash (FA) in the absorbing layer as well as the matching layer for impedance matching. Waste polyethylene terephthalate bottle fragment was introduced as electromagnetic transparent reinforcement aggregate. Carbon black was used to be original absorbent in the absorbing layer. The microstructure and electromagnetic parameters of FA were closely looked at through scanning electron microscope, X-ray diffraction, and analyzer of vector network. The absorption and mechanical properties of cement-based composites were tested. It turned out that when the optimal replacement ratio of FA in the absorbing layer and matching layer gets to 50%:30%, the minimum value of reflection loss achieves −22.3 dB at 13.2 GHz; also, the value of absorption bandwidth that is effective (<−8 dB) is 6.4 GHz. Ni-Zn ferrite proves to be a feasible absorbent that is additional for the matching layer compared to what is added to the absorbing layer. The compressive strength of all the mixtures decreased, while the flexural strength decreased first and then increased with the rise of the FA replacement level.

25

Nguyen, Xuan Phuong, Dinh Tuyen Nguyen, Van Viet Pham, and Dinh Tung Vo. "HIGHLIGHTS OF OIL TREATMENT TECHNOLOGIES AND RISE OF OIL-ABSORBING MATERIALS IN OCEAN CLEANING STRATEGY." Water Conservation & Management 6, no. 1 (2022): 06–14. http://dx.doi.org/10.26480/wcm.01.2022.06.14.

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Nowadays, the problem of oil pollution is becoming a big challenge for the environment. Oil pollution threatens the survival of life on land as well as aquatic life. Aware of the seriousness of oil pollution, there have been many scientific studies on solutions to oil spill treatment. The methods can be mentioned as mechanical treatment, microbiological treatment, chemical treatment, absorbent material treatment. Each method has its advantages and disadvantages. In this short review, recent research activities related to the selection of oil-absorbing absorbents and their application in oil absorption are presented. Then, an extensive list of different oil-absorbing materials from the literature, including polymeric materials, porous inorganic materials, and biomass materials, was provided along with their characteristics. Furthermore, the oil adsorption capacity of such materials for different oils and organic solvents has also been discussed to highlight different factors involved in the selection of adsorbent adsorbents. Oil has been tested to separate oil in oil-water mixtures. Finally, some future trends and prospects for oil-absorbing materials are outlined.

26

Gong, Yu Jun, Song Shan Qiu, Ye Zhang, and Jin Ping Wei. "Study on the Oil-Absorbing Materials with Waste Plastics." Advanced Materials Research 306-307 (August 2011): 1604–8. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.1604.

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The shockproof foam (EPE) was screened out as a cheap and efficient oil-absorbing material in this paper. The influences of the particle size, the time of oil-absorbing, the aperture size of waste plastics, oil slick thickness on the oil-absorbing properties were investigated. The second and third time oil-absorbing capacities were also discussed. The results showed that (a) the best conditions of recovering spilled oil by use of shockproof foam (EPE) were as follows: the size of particle was 5mm, the time of absorption was 15 min, and the thickness of oil layer was more than 2 mm. (b) After appropriate pressing and centrifugal deoiling, the quality of oil-absorbing was effective in second and third time. The saturated oil-absorbing capacity reached to 30g/g. The double control effect was achieved by waste to pollution.

27

Y. Al Jubory, Ammar. "Microwave Absorbing Characteristics Study of Three Layers Radar Absorbing Materials (RAM)." Rafidain Journal of Science 20, no. 2 (March 1, 2009): 160–72. http://dx.doi.org/10.33899/rjs.2009.40230.

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28

MITSUHASHI, Ryousuke, and Tatsuya MORISHITA. "103 Design of Sound Absorbing Device Using Resonator and Absorbing Materials." Proceedings of the Symposium on Environmental Engineering 2014.24 (2014): 8–10. http://dx.doi.org/10.1299/jsmeenv.2014.24.8.

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29

Liu, Zhao-Hui, Guo-Dong Ban, Ze-Qi Jiang, Na Liu, Sheng-Tian Ye, and Rui Tao. "Absorbing Properties of Nickalloy/Iron Package Mica Powder Composite Absorbing Materials." Journal of Computational and Theoretical Nanoscience 14, no. 4 (April 1, 2017): 1794–800. http://dx.doi.org/10.1166/jctn.2017.6507.

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30

Tian, Hao, and Hai Tao Liu. "Improvement of the Absorbing Properties of Single Layer Microwave Absorbing Materials via Frequency Selective Surface." Applied Mechanics and Materials 275-277 (January 2013): 1988–93. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.1988.

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The absorbing properties of single layer microwave absorbing materials containing frequency selective surface have been analyzed by a finite element method. Absorbing materials with optimum absorbing performances are fabricated according to the numerical simulation results. Experiments are carried out to validate the analytical method. The results show that the presence of the frequency selective surface can significantly improve the absorbing properties of the single layer microwave absorbing materials if proper parameters are chosen, promising great potentials in the microwave absorption applications.

31

Tian, Yurui, Yingying Jiang, and Qiushi Liang. "Research progress and practical application of magnetic composite absorbing materials." Highlights in Science, Engineering and Technology 69 (November 6, 2023): 480–88. http://dx.doi.org/10.54097/hset.v69i.12222.

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The update and iteration of communication technology, the continuous emergence of new electronic devices, smart home appliances and new energy vehicles, and the widespread use of military electromagnetic technology have caused serious electromagnetic radiation problems. Nanomagnetic materials have special electromagnetic properties and become the continuous research object of absorbing materials, especially in the development of low-frequency absorbing materials. This paper reviews the theoretical basis and research status of nanomagnetic materials in low-frequency absorbing materials and composite absorbing materials that are "thin, light, wide, and strong". In addition, the basic research is aimed at realizing the final application, and this paper also summarizes the application status of the absorbing agent in practical application.

32

Shi, Yan Jin, and Yan Feng. "New Oil-Absorbing Material." Advanced Materials Research 287-290 (July 2011): 667–70. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.667.

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With the development of industry, water pollution is increasingly severe. The research and development of oil-absorbing materials plays an important role in solving the ecological environment protection. Various oil-absorbing materials are introduced. Then, the new oil-absorbing materials are introduced mainly, including classification, production methods, oil-absorbing mechanism and properties. The limitations of the new oil-absorbing materials are pointed. And the development direction of oil-absorbing materials should be toward the high efficiency, low-cost, environmentally friendly and biodegradable.

33

Wei, Sai Nan, Rui Zhou Li, Li Chen, and Ji Ming Yao. "Research of Fiber Radar Absorbing Materials." Advanced Materials Research 602-604 (December 2012): 835–38. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.835.

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Electromagnetic parameters and absorbing properties of fiber absorbents (carbon fiber, SiC fiber and polycrystalline iron fiber) were introduced. The influences of the arrangement, thickness and content of the fibers on radar absorbing property were summarized. New development directions of the fiber absorbents were also indicated.

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Wang, Tongshu, Xiaoguang Wang, Daoyuan Tang, Chenchen Jia, Bole Ren, and Youan Ji. "Research Progress of Ceramic-based Absorbing Composite Materials." Academic Journal of Science and Technology 8, no. 3 (December 28, 2023): 24–28. http://dx.doi.org/10.54097/09bq0587.

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Absorbing materials can convert electromagnetic energy into other forms of energy. In recent years, ceramic-based absorbing composite materials have received widespread attention from researchers in many fields, such as mobile communications and military technology due to their excellent performance in corrosion resistance and stability, and have extremely broad application prospects. This article first briefly describes the structure and absorption principle of ceramic matrix composite absorbing materials. Then the research progress of ceramic-based absorbing materials in recent years was reviewed, including the preparation processes and advantages and disadvantages of various ceramic substrates. Finally, we review the practical application scenarios of this material and discuss future research directions and urgent problems to be solved.

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Afanasiev, Anatoly, and Yulia Bakhracheva. "Analysis of the Types of Radar Absorbing Materials." NBI Technologies, no. 2 (October 2019): 35–38. http://dx.doi.org/10.15688/nbit.jvolsu.2019.2.6.

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Lagarkov, Andrey Nikolayevich, Vladimir Nikolayevich Kisel, and Vladimir Nikolayevich Semenenko. "Radar Absorbing Materials Based on Metamaterials." Advances in Science and Technology 75 (October 2010): 215–23. http://dx.doi.org/10.4028/www.scientific.net/ast.75.215.

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The use of metamaterial for design of radar absorbing material (RAM) is discussed. The typical features of the frequency dependencies of , , ,  of composites manufactured of different types of resonant inclusions are given as an example. The RAM characteristics obtained by the use of the composites are given. It is shown that it is possible to use for RAM design the metamaterials with both the positive values of ,  and negative ones. Making use of the frequency band with negative  and  it is possible to create a RAM with low reflection coefficient in a wide range of the angles of electromagnetic wave incidence.

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Ciaburro, Giuseppe. "Recycled Materials for Sound Absorbing Applications." Materials Science Forum 1034 (June 15, 2021): 169–75. http://dx.doi.org/10.4028/www.scientific.net/msf.1034.169.

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The use of recycled materials to replace natural and artificial materials represents an interesting and real possibility for all industrial sectors to contribute to the reduction of the amount of waste disposed of and non-renewable resources consumed. This study reports the results of the measurements of the sound absorption coefficient carried out on specimens obtained from the recycling of different materials. A sustainable development of our planet requires us to adopt materials recycling policies to ensure the economical use of resources. Two types of materials have been studied: material obtained from the recycling of plastic bottles, and a material obtained from the recycling of asphalt milled. Both materials showed interesting sound absorption performances covering different frequency ranges.

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Umnova, Olga, Keith Attenborough, and Alan Cummings. "Nonlinear behavior of poroelastic absorbing materials." Journal of the Acoustical Society of America 109, no. 5 (May 2001): 2453. http://dx.doi.org/10.1121/1.4744697.

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Vinoy, K. J., and R. M. Jha. "Trends in radar absorbing materials technology." Sadhana 20, no. 5 (October 1995): 815–50. http://dx.doi.org/10.1007/bf02744411.

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Lü, Xu Liang, Chao Wu, and Zhao Yang Zeng. "Comparison Analysis of Absorption Properties for Microwave Absorbent." Key Engineering Materials 512-515 (June 2012): 1132–35. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.1132.

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In order to compare the absorbing properties of different microwave-absorbing agents and their mixture, this paper has selected two typical microwave-absorbing agents which respectively are carbon fiber resistance microwave-absorbing agents and ferrite magnetism microwave-absorbing agents, and took them as monolayer absorbing materials. Then used MG formula to calculate the effective electromagnetic parameter of their mixture under different proportion at X band, and finally analyzed their absorbing properties separately. Then through contrasting the impedance matching characteristic and attenuation coefficient of the materials, it is proved that adding carbon fiber in ferrite can not improve absorption properties. Although the ability of attenuating electromagnetic wave would be enhanced when resistance materials and magnetism materials are blend with each other, doping will destroy the materials’ impedance matching characteristic because most resistance materials have high permittivity. It makes reflection strengthen and can not improve absorbing properties.

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Hao, Xin Min, Yuan Yang, Xiao Chen, Jie Huang, and Xin Hao. "Study on Moisture Comfort of Different Fiber Materials in Sport Shoes." Advanced Materials Research 821-822 (September 2013): 313–16. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.313.

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The sport shoes should have moisture absorbing & quick drying property, the quick-drying property of the shoes is affected by the shoe material such as upper, lining and insole. In this paper, three types shoes were prepared with hemp/polyester blended fabric, cotton and polyester. Their quick-drying properties of were studied using methods such as static simulation and animated simulations. The hemp/Polyester shoe possesses better moisture absorbent and quick drying property.

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Zhao, Jun Liang, Li Xin Li, and Zhong Juan Yang. "Dynamic Mechanical Properties of a Novel Structural Radar Absorbing Materials." Applied Mechanics and Materials 364 (August 2013): 771–74. http://dx.doi.org/10.4028/www.scientific.net/amm.364.771.

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A novel structural radar absorbing materials (SRAM), which give the new absorbing microwaves function to the normal resin-base composites, were prepared. The dynamic compressive tests of SRAM were carried out along both in-plane and normal plane directions of composites by means of the Split Hopkinson Pressure Bar (SHPB). In compressive test along in-plane direction, failure happened at the interface between fiber and matrix. Fracture mode and mechanism was proposed to explain these results. The adding of magnetic absorbing particles resulted in the deterioration of the compressive properties. But there was no obvious decrease on compressive strength of SRAM with the radar absorbing properties.

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Zhan, Rong, Jiaqiao Zhang, Qiang Gao, Qi Jia, Zhixiang Zhang, Guangyu Zhang, and Wenyan Gu. "Microwave Absorption Performance of Single-Layer and Multi-Layer Structures Prepared by CNTs/Fe3O4 Nonwoven Materials." Crystals 11, no. 8 (August 22, 2021): 1000. http://dx.doi.org/10.3390/cryst11081000.

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Electromagnetic radiation can cause serious harm to the human body, such as the rise in body temperature and the decrease in immune function. In this study, the carbon nanotubes (CNTs)/Fe3O4 nonwovens were used to prepare wearable flexible absorbing materials. First, the single-layer absorbing structures were prepared by hot rolling, dipping, and film fabrication, respectively. Then, the single-layer structures were combined to form the multi-layer absorbing structures. By testing and analyzing the absorbing performance of various structures in the X-band frequency range, the optimum combination scheme was found, together with a good reflection loss value of CNTs/Fe3O4 nonwoven material. The experiment results displayed that the single-layer hot-rolled nonwovens modified by CNTs have the best wave absorbing performance. Its minimum reflection loss of −18.59 dB occurred at 10.55 GHz, and the efficient frequency occurred at 8.86–12.40 GHz. The modified film can significantly improve the absorbing performance of multi-layer structures. In addition, the absorbing performance was closely related to both the place where the absorbing film was introduced and the type of absorbing fillers. When the film-forming CNTs (FC) film was located at the bottom layer of the multi-layer structure, the hot rolled CNTs hot rolled mixed reagent film forming CNTs (HC-HM-FC) structure constructed exhibited the best absorbing effects. Its minimum reflection loss can reach −33 dB, and the effective absorbing frequency range covered half of the X-band.

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Zhang, Zeng Zhi, Na Gu, and Ji Fei Zhang. "The Application of Aqueous Span 80 Composite Material in Methane Absorption and Explosion Suppression." Materials Science Forum 610-613 (January 2009): 125–29. http://dx.doi.org/10.4028/www.scientific.net/msf.610-613.125.

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This paper aims to design a sort of aqueous atomization absorbing material which can absorb mine gas under coal mine to decrease the methane concentration and reduce the explosion hazard. The material was composed of water as matrix, Span 80 as methane absorbent, and inorganic salt as additive. Methane the main component of mine gas was used as model of mine gas. The influence of concentration of inorganic salt on absorption and the effect of different compound materials made of Span 80 and inorganic salt on absorption were studied using Head Space Gas Chromatography to determine the content of methane absorbed. Explosion chamber was used as experiment system to simulate mine gas explosion. The explosion suppression effects of absorbing materials were studied preliminarily in explosion chamber using the maximum explosion pressure and residual methane content after explosion as parameters. The results indicate that the absorbing material can absorb more methane than water and can partly inhibit the explosion of the mixture of methane and air.

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Liu, Yuan. "Advances in magnetic nano-wave absorbing materials." Applied and Computational Engineering 25, no. 1 (November 7, 2023): 286–91. http://dx.doi.org/10.54254/2755-2721/25/20230780.

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Magnetic materials are materials with specific magnetic properties, produced mainly by chemical methods such as co-saturation and high temperature pyrolysis, and with controllable product morphology and size. Magnetic particles have a high surface activity and a tendency to agglomerate, which can not only improve their dispersion and biocompatibility, but also achieve specific functions through surface modification in the actual research process. The research and application of wave-absorbing materials will have a major impact on the development of civilian electromagnetic radiation shields. Absorbents with good wave-absorbing properties are at the core of wave absorbing materials, and to meet the requirements of their thin, light, wide and strong properties, absorber research has also advanced towards high efficiency, composites, compatibility and intelligence. By summarising and analysing existing research, this paper provides a comprehensive overview of the research achievements and applications of magnetic wave absorbing materials in the medical and military fields to further explore the application potential, current challenges and future developments of such materials in various fields.

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Can, Tong, and Qiu Xue. "Research Progress of Underwater Sound-absorbing Material." Expert Review of Chinese Chemical 2, no. 2 (April 20, 2024): 48–52. http://dx.doi.org/10.62022/ercc.issn3006-0095.2024.02.009.

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This article provides an overview of underwater sound-absorbing materials mainly applied with polyurethane matrix. It mainly elaborates on the underwater sound mechanism, commonly used underwater sound-absorbing materials and structures, as well as new underwater sound-absorbing material structures derived from local resonance phononic crystals, such as phononic crystals, local resonance phonon wood piles, and metamaterial sound-absorbing structures. This provides a broader development space and direction for the future development of underwater sound-absorbing materials

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Cao, Xiao Wei, Zhi Zhang, Pin Zhang, and Ya Wen Liu. "Research on Preparation and Absorbing Performance of Graphene Oxide and Reduced Graphene Oxide." Key Engineering Materials 922 (June 8, 2022): 37–43. http://dx.doi.org/10.4028/p-e2yta0.

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In this paper, graphene oxide (GO) is successfully prepared by the Hummers' method, based on which reduced graphene oxide (rGO) is prepared by the hydrothermal reduction method. Based on the characterization of GO and rGO materials, the electromagnetic parameters of the two materials are tested by the coaxial ring method, and their electromagnetic wave absorbing performance is analyzed in detail. It is found that GO has no obvious absorbing performance, while rGO exhibits partial absorbing performance. The latter has weak absorbing performance due to its characteristics limitation but has high electromagnetic wave absorbing potential due to its excellent dielectric performance. At the same time, because of the unique two-dimensional lamellar structure and abundant active sites on the surface, rGO can be used as an excellent substrate material to prepare composite absorbing materials with excellent electromagnetic wave absorbing performance.

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Journal, Baghdad Science. "New Solar Thermal Materials." Baghdad Science Journal 1, no. 1 (March 8, 2021): 154–57. http://dx.doi.org/10.21123/bsj.2004.1.1.154-157.

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A number of ehemical ion materials were used as an absorber against solar energy. These materials were selected according to their absorption spectra in the wavelength range 300-800nm where the solar spectrum is coventrated. A solar olleetorw^esigd and The ability of each material inside the collector for absorbing the solar radiation was examined by a converter parameter “R”.According to the “R” parameter, the cohaltous and copperic ions material seems to be of higher capability for absorbing solar energy than the other materials.All the results were analyzed by means of a least-squared fitting program.

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Journal, Baghdad Science. "New Solar Thermal Materials." Baghdad Science Journal 1, no. 1 (March 7, 2004): 154–57. http://dx.doi.org/10.21123/bsj.1.1.154-157.

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A number of ehemical ion materials were used as an absorber against solar energy. These materials were selected according to their absorption spectra in the wavelength range 300-800nm where the solar spectrum is coventrated. A solar olleetorw^esigd and The ability of each material inside the collector for absorbing the solar radiation was examined by a converter parameter “R”.According to the “R” parameter, the cohaltous and copperic ions material seems to be of higher capability for absorbing solar energy than the other materials.All the results were analyzed by means of a least-squared fitting program.

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Wang, Dongli, Siqing Liu, Bingqiang Dong, Lili Yuan, Huimin Pan, and Qingxin Zhao. "Research Progress on Factors Affecting Oil-Absorption Performance of Cement-Based Materials." Materials 16, no. 8 (April 17, 2023): 3166. http://dx.doi.org/10.3390/ma16083166.

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With the wide application of petroleum resources, oil substances have polluted the environment in every link from crude oil extraction to utilization. Cement-based materials are the main materials in civil engineering, and the study of their adsorption capacity for oil pollutants can expand the scope of functional engineering applications of cement-based materials. Based on the research status of the oil-wet mechanism of different kinds of oil-absorbing materials, this paper lists the types of conventional oil-absorbing materials and introduces their application in cement-based materials while outlining the influence of different oil-absorbing materials on the oil-absorbing properties of cement-based composites. The analysis found that 10% Acronal S400F emulsion can reduce the water absorption rate of cement stone by 75% and enhance the oil-absorption rate by 62%. Adding 5% polyethylene glycol can increase the oil–water relative permeability of cement stone to 1.2. The oil-adsorption process is described by kinetic and thermodynamic equations. Two isotherm adsorption models and three adsorption kinetic models are explained, and oil-absorbing materials and adsorption models are matched. The effects of specific surface area, porosity, pore interface, material outer surface, oil-absorption strain, and pore network on the oil-absorption performance of materials are reviewed. It was found that the porosity has the greatest influence on the oil-absorbing performance. When the porosity of the oil-absorbing material increases from 72% to 91%, the oil absorption can increase to 236%. In this paper, by analyzing the research progress of factors affecting oil-absorption performance, ideas for multi-angle design of functional cement-based oil-absorbing materials can be obtained.