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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.
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.
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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.
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’.
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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.
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.
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.
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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.
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.
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.
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.
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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.
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.
Lisachuk, G. V., R. V. Kryvobok, Y. M. Pitak, O. Lapuzina, N. A. Kryvobok, and N. S. Maystat. "Radio-absorbing materials with adjustable dielectric properties." Thesis, Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/38982.
Sudhendra, Chandrika. "A Novel Chip Resistor Spacecloth For Radar Absorbing Materials." Thesis, Indian Institute of Science, 2006. https://etd.iisc.ac.in/handle/2005/280.
Spacecloth design and development is vital and crucial in Radar Absorbing Materials (RAM) for achieving Low Observability in an Aircraft or an Unmanned Air Vehicle(UAV). The RAM design translates into the spacecloth design. The spacecloths form the constituent layers in a broadband Jaumann absorber in which case they have to be designed for various values of surface resistivity. The design specifications of spacecloth(s) in RAMS is well understood and documented in literature. But the design of spacecloth hitherto, has been the domain of materials' scientists wherein the specified properties of the spacecloth are achieved by an iterative, trial and error process, by mixing various constituents in different proportions to get the design specified surface resistivity in the final end-product. In an effort to bridge this gap, a novel spacecloth for RAM applications is proposed in the thesis. It is proposed that a repetitive geometrical grid network of chip resistors simulates spacecloth. The sheet resistivity of the spacecloth is derived by analyzing various geometries like square, rectangle, triangle and hexagonal grids. The transmission and reflection loss for the chip resistor spacecloth is derived. The design of chip resistor spacecloths for operation at S and C bands is given followed by experimental verification using waveguide simulator experiments. Numerical study of multilayer RAM has been carried out with exponential taper variation of surface resistivities for constituent spacecloth layers and design curves are given for multilayer RAM both for normal and oblique incidence for TE and TM polarizations.
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Sudhendra, Chandrika. "A Novel Chip Resistor Spacecloth For Radar Absorbing Materials." Thesis, Indian Institute of Science, 2006. http://hdl.handle.net/2005/280.
Spacecloth design and development is vital and crucial in Radar Absorbing Materials (RAM) for achieving Low Observability in an Aircraft or an Unmanned Air Vehicle(UAV). The RAM design translates into the spacecloth design. The spacecloths form the constituent layers in a broadband Jaumann absorber in which case they have to be designed for various values of surface resistivity. The design specifications of spacecloth(s) in RAMS is well understood and documented in literature. But the design of spacecloth hitherto, has been the domain of materials' scientists wherein the specified properties of the spacecloth are achieved by an iterative, trial and error process, by mixing various constituents in different proportions to get the design specified surface resistivity in the final end-product. In an effort to bridge this gap, a novel spacecloth for RAM applications is proposed in the thesis. It is proposed that a repetitive geometrical grid network of chip resistors simulates spacecloth. The sheet resistivity of the spacecloth is derived by analyzing various geometries like square, rectangle, triangle and hexagonal grids. The transmission and reflection loss for the chip resistor spacecloth is derived. The design of chip resistor spacecloths for operation at S and C bands is given followed by experimental verification using waveguide simulator experiments. Numerical study of multilayer RAM has been carried out with exponential taper variation of surface resistivities for constituent spacecloth layers and design curves are given for multilayer RAM both for normal and oblique incidence for TE and TM polarizations.
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Lebedev, Andrej. "Theoretical description of the optical response of heterogeneous absorbing materials." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=96177049X.
Die Arbeit befaßt sich mit der Beschreibung
der linearen optischen Eigenschaften von
heterogenen absorbierenden Materialien,
insbesondere von Clustermaterialien. Das Ziel der
Arbeit besteht in der Ausarbeitung einer
analytischen Methode zur Berechnung des optischen
Verlustes (Extinktion) des heterogenen Materials.
Die präsentierte Methode basiert auf der
klassischen Beschreibung der
Licht-Materie-Wechselwirkung mit Hilfe
dielektrischer Funktionen.
Das Modell berücksichtigt eine mögliche Absorption
in der Einbettmatrix, Mehrfachstreungseffekte in
Systemen mit dichtgepackten Clustern und die
Clusterstatistik.
Um die Absorption in der Einbettmatrix beschreiben
zu können, wird die Mie-Theorie der Lichtstreuung
an einem sphärischen Teilchen in einer
nichtabsorbierenden Umgebung erweitert. Die
Clusterstatistik wird dadurch berücksichtigt, daß
die optischen Eigenschaften eines makroskopischen
Clustersystems als eine Mittelung der
Eigenschaften kleinerer Clusteraggregate berechnet
werden. Die zur Berechnung verwendeten
Clusteraggregate, deren statistische Eigenschaften
der Probenherstellungsmethode entsprechen, werden
mit Hilfe von Monte-Carlo-Simulation des
Clusterwachstums auf Oberflächen generiert.
Nach einer Beschreibung des theoretischen Apparats
werden numerische Beispiele dargestellt, die die
Anwendung der Methode demonstrieren.
Die Extinktion von Eisenclustern in Fulleritmatrix
wird in der Einzelteilchennäherung berechnet und
mit experimentellen Daten verglichen.
Die Extinktionskoeffizienten von Silberclustern
in zwei molekularen Matrizen werden mit der
Berücksichtigung der Clusterstatistik und
Mehrfachstreungseffekten berechnet. Der Vergleich
mit den experimentellen Werten läßt auf den
Einfluß der betrachteten Effekte auf
charakteristische Merkmale in den Spektren von
makroskopischen Clustersystemen schlißen.
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Norindr, Florian. "Study of inorganic transparent materials with near-infrared absorbing properties." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/171095/.
The pigments investigated in this thesis were synthesised and characterised in order to find promising candidates for near-infrared absorbers. The chemical systems were chosen due to their absorbing properties and also their chemical and thermal stability and non-toxicity as well as for economical reasons. Investigations were undertaken on several phosphates and silicates.Within the group of phosphates, first several known copper compounds, i.e.Cu2P2O7, Cu4P2O9, Cu5P2O10, Cu3(PO4)2, Cu(PO3)2 and Cu2P4O12, were tested and the most suitable were chosen for more detailed experiments. The structure types with the general formula M2P2O7 were found to be promising and the metals calcium, strontium and copper were investigated as a starting point. It was confirmed that M2P2O7 (with M = Ca or Sr) and Cu2P2O7 could only form a pigment material for the middle member e.g. MCuP2O7. Better candidates were found in the systems Mg/Cu and Zn/Cu. Here solid solutions occur and the absorption behaviour could be adjusted according to the ratio of the metal cations. A series of different cation ratio compounds were synthesised for both systems. As Zn/Cu shows more favourable absorption properties compared to Mg/Cu, a full investigation of structural parameters including neutron powder diffraction and EXAFS studies was undertaken and the influence of the shape of M–O coordination spheres on the near-infrared absorption properties is discussed in detail. After deriving the successful concept it was investigated in two further chemical systems. First, the cation Fe2+ was used into the Zn3(PO4)2 structure to form a solid solution (Zn,Fe)3(PO4)2 and then Cu2+ was introduced into the Mg2Si2O6 pyroxene structure. Resulting from the studies, three promising systems for transparent near-infrared absorbing pigment applications were isolated: (Zn,Cu)2P2O7, (Zn,Fe)3(PO4)2 and (Mg,Cu)2Si2O6 solid solutions
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Zheng, Lixin. "Design, synthesis, and characterization of organic and polymeric two-photon absorbing materials /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/10599.
Ohira, Shino. "Theoretical evaluation of the nonlinear optical properties of extended and p-conjugated chromophores." Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29717.
Thesis (Ph.D)--Chemistry and Biochemistry, Georgia Institute of Technology, 2009. Committee Chair: Brédas, Jean-Luc; Committee Member: Janata, Jiri; Committee Member: Kippelen, Bernard; Committee Member: Marder, Seth; Committee Member: Sherrill, David. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Ford, Lee. "Adaptive radar signature control with the use of radar absorbing materials." Thesis, University of Sheffield, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398391.
MRS International Meeting on Advanced Materials (1st 1988 Tokyo, Japan). Hydrogen absorbing materials ; Catalytic materials: May 31-June 3, 1988, Sunshine City, Ikebukuro, Tokyo, Japan. Edited by Morooka Yoshihiko 1938- and Materials Research Society. Pittsburgh, Pa: Materials Research Society, 1989.
Harris, David A. "Sound Absorbing Materials." In Noise Control Manual, 9–21. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4757-6009-5_2.
Vinoy, K. J., and R. M. Jha. "Introduction." In Radar Absorbing Materials, 1–18. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0473-9_1.
Vinoy, K. J., and R. M. Jha. "Fundamental Electromagnetic Concepts for RAM." In Radar Absorbing Materials, 19–50. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0473-9_2.
Vinoy, K. J., and R. M. Jha. "Mathematical Analysis for RAM on Surfaces." In Radar Absorbing Materials, 51–95. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0473-9_3.
Vinoy, K. J., and R. M. Jha. "Electromagnetic Design of RAM." In Radar Absorbing Materials, 97–141. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0473-9_4.
Vinoy, K. J., and R. M. Jha. "Absorber Characterization Techniques." In Radar Absorbing Materials, 143–58. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0473-9_5.
Vinoy, K. J., and R. M. Jha. "Identification and Applications of RAM." In Radar Absorbing Materials, 159–67. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0473-9_6.
Vinoy, K. J., and R. M. Jha. "Trends in RAM." In Radar Absorbing Materials, 169–73. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0473-9_7.
Cho, Hae Yong, Chang Ha Choi, Jin Young Kim, Dae Ho Choi, and Soo Wohn Lee. "Sound Absorbing Properties of Foamed Glasses." In Materials Science Forum, 578–81. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-966-0.578.
Тези доповідей конференцій з теми "Absorbing materials":
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Sun, Huimin, and Zhaozhan Gu. "Absorbing Properties of Honeycomb Structure Absorbing Materials." In 2015 International Conference on Advanced Material Engineering. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814696029_0047.
Huang, Shaowu, Xiaoning Ye, and Kai Xiao. "Probe with absorbing materials." In 2016 IEEE International Symposium on Electromagnetic Compatibility - EMC 2016. IEEE, 2016. http://dx.doi.org/10.1109/isemc.2016.7571630.
Grebenshikov, Sergey V. "Absorbing materials in multilayer mirrors." In ECO4 (The Hague '91), edited by Rolf-Juergen Ahlers and Theo T. Tschudi. SPIE, 1991. http://dx.doi.org/10.1117/12.46828.
Larruquert, Juan I., Mónica Fernández-Perea, Manuela Vidal, José A. Méndez, and José A. Aznárez. "Constructing Multilayers with Absorbing Materials." In Optical Interference Coatings. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/oic.2007.wd1.
Afsar, Mohammed N. "Millimeter wave radar absorbing materials." In 18th International Conference on Infrared and Millimeter Waves. SPIE, 1993. http://dx.doi.org/10.1117/12.2298519.
Sung, Shung H., and Donald J. Nefske. "Coupling Sound Absorbing Materials With an Air Cavity Using Frequency Dependent Bulk Material Properties." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67678.
This paper presents the acoustic finite element method and the modal solution method for coupling sound absorbing materials with an air cavity to predict the sound pressure frequency response. The sound absorbing materials are represented with complex, frequency-dependent, effective mass-density and bulk-modulus properties obtained from the acoustic impedance of material samples. To couple the sound absorber cavity and air cavity, the boundary conditions at the interface between the cavities requires equality of pressure and equality of acoustic volume flow. Two modal solution methods are developed to compute the frequency response of the coupled system with frequency dependent material properties: the component mode method and the coupled mode method. The finite element and modal solution methodology is developed in a form readily adaptable for implementation in commercially available codes. The accuracy of the modal solution methodology is assessed for modeling a one-dimensional air tube terminated with absorbent material and the seats in an automobile passenger compartment.
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Liu, Qian, Xiangyang Jiao, Jing Li, Victor Khilkevich, James Drewniak, Paul Dixon, and Yoeri Arien. "Modeling absorbing materials for EMI mitigation." In 2015 IEEE International Symposium on Electromagnetic Compatibility - EMC 2015. IEEE, 2015. http://dx.doi.org/10.1109/isemc.2015.7256405.
Wang Xinwei and Lu Yinghua. "Absorbing materials optimization on characteristic parameters." In Proceedings of International Symposium on Electromagnetic Compatibility. IEEE, 1997. http://dx.doi.org/10.1109/elmagc.1997.617201.
Haberman, Michael R., Carolyn C. Seepersad, Preston S. Wilson, Kim Alderson, Andrew Alderson, and Fabrizio Scarpa. New Solutions for Energy Absorbing Materials. Fort Belvoir, VA: Defense Technical Information Center, November 2012. http://dx.doi.org/10.21236/ada582743.
Leathe, Nicholas. Additively Manufactured Shock Absorbing Engineered Materials. Office of Scientific and Technical Information (OSTI), November 2018. http://dx.doi.org/10.2172/1761082.
Read, David L., and Larry C. Muszynski. Energy Absorbing Materials for Protective Structures. Phase 2. Fort Belvoir, VA: Defense Technical Information Center, August 1994. http://dx.doi.org/10.21236/ada311039.
Marder, Seith R., and Joseph W. Perry. DURIP97 Instrumentation for Characterization of Two-Photon Absorbing Organic Materials. Fort Belvoir, VA: Defense Technical Information Center, June 1998. http://dx.doi.org/10.21236/ada347827.
Deryabin, I. V. Noise-absorbing panel with bypass channels. FORGING AND STAMPING PRODUCTION. MATERIAL WORKING BY PRESSURE, August 2023. http://dx.doi.org/10.12731/kshpomd62023-deryabin.
Noise, having a harmful effect on humans and the environment, forces us to search and conduct research on the development of new methods and means of noise protection. Currently, with an increasing increase in the flow of vehicles in residential areas, with the development of industrial production, the issue of noise control is becoming particularly relevant. A well-known and effective technical solution for blocking the transmission of acoustic energy is the use of noise-absorbing panels, both as part of various soundproof structures, and in the form of separate acoustic elements installed in noisy rooms. The article discusses the design of a noise-absorbing panel containing through bypass channels. Such a panel has a broadband sound absorption effect in frequency composition due to the use of porous sound-absorbing structures of structural materials with the integration of bypass channels into their composition.
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Jianguo, He, Lu Zhongliang, and Su Yi. Experimental Investigation of Impulse Radar for Mitigation of Effects of Radar Absorbing Materials,. Fort Belvoir, VA: Defense Technical Information Center, April 1995. http://dx.doi.org/10.21236/ada294166.
Wang, Lumin, and Jonathan Brett Wierschke. Evaluation of Aluminum-Boron Carbide Neutron Absorbing Materials for Interim Storage of Used Nuclear Fuel. Office of Scientific and Technical Information (OSTI), April 2015. http://dx.doi.org/10.2172/1178572.
Farmer, J., and J. Choi. Neutron-Absorbing Coatings for Enhanced Criticiality Safety: Long-Term Storage of Fissile Materials & Equipment for Reprocessing Spent Fuel. Office of Scientific and Technical Information (OSTI), March 2007. http://dx.doi.org/10.2172/1129154.
Maragoudakis, Christos E., and Vernon Kopsa. Effects of Radar Absorbing Material (RAM) on the Radiated Power of Monopoles with Finite Ground Plane. Fort Belvoir, VA: Defense Technical Information Center, January 2009. http://dx.doi.org/10.21236/ada494124.
