Design of a single layer broadband microwave absorber using cobalt-substituted barium hexagonal ferrite (original) (raw)
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Materials, 2020
The pulsed high power microwave (HPM) technology has been developed worldwide for over 20 years. The sources of HPM pulses are a weapon of mass destruction. They pose danger especially to computer and telecommunications equipment and systems, both the military and civilian ones. This paper presents a survey of literature on electromagnetic wave radiation absorbing and shielding materials to be used in construction. Relevant protective measures should include the shielding of buildings or their parts and the absorption of radiation by building envelopes and their elements. The main focus is on the possibilities of improving the shielding and absorptive properties of common construction materials, such as concrete, mortars and synthetic resins. The survey covers the following groups of materials: carbon-based admixtures, nickel powder, iron powders, ferrites, magnetite and polymers. The final part of the survey is devoted to hybrid foam microwave absorbers in which the shape of the ma...
Performance Simulation of Pyramidal and Wedge Microwave Absorbers
2009
Anechoic chambers signal absorption capability is directly correlated to its performance. One of the main components in enabling signal absorption is the design and material used in designing the absorbers. Two of the main types are pyramidal and wedge-shaped ones. In this work, truncated pyramidal and truncated wedge absorbers for anechoic chamber application have been designed to operate effectively in the microwave frequencies from 1 - 10 GHz. The absorbers were simulated using a fusion of carbon-based material with different features and coating thickness to improve their performance and significant material cost savings. Material consideration for the basic pyramidal and wedge structure has also been taken into account. The designs are simulated using CST Microwave Studio. Simulated results showed that the coating of half the absorber height produced the best performance in terms of signal absorption.
Effect of Non Seismic Walls on frames -, 2021
Effect of Non Seismic Walls on frame - اهمال جدران حمالة في مقاومة الزلازل حيث الإطارات فقط تقاوم تأثير الزلازل - ماهي التأثيرات حول قيمة العامل "R" وكيفية اخراج او ادخال صلابة الجدران من مقاومة الزلاز لوحدها تقاوم كامل قوى القص القاعدي الجمل المختلطة في مقاومة الزلازل أعمدة إطارات + جدران قصية اعطى الكود يمكن اهمال الأعمدة في المشاركة ومقاومة الزلازل وورقة البحث حول العكس واهمال جدران حمالة في مقاومة الزلازل حيث الإطارات فقط تقاوم الزلازل - ماهي التأثيرات حول قيمة العامل "R" وكيفية اخراج او ادخال صلابة الجدران من مقاومة الزلازل وان الإطارات لوحدها تقاوم كامل قوى القص القاعدي ----------- اهمال حدران حجرية وخرسانة ومقاومة الزلازل فقط والحمولات ت الشاقولية والاطارات لوحدها مقاومة كافة قوى الزلازل رغم تواجد جدران حمالة فقط من اجل حمولات رأسية - لدينا R = 8 في حال إطارات الأعمدة مقاومة للعزوم والزلازل لدبنا R= 4 في حال جدران قصية دون أعمدة تقاوم الزلازل لدينا R =7 في حال ثنائية جدران واطارات تقاوم الزلازل لدينا R = 4 في حال ثنائية إطارات وتواجد جدران لكن الجدران تقاوم كامل القص القاعدي V دون مشاركة الإطارات لدينا R = 6 في حال ثتائية إطارات وتواجد جدران لكن الإطارات تقاوم كامل القص القاعدي V دون مشاركة الجدران Effect of Non Seismic Walls on frame - Neglecting load-bearing walls in resisting earthquakes, as only frames resist the impact of earthquakes - What are the effects on the value of the factor “R” and how to deduct or enter the stiffness of walls from earthquake resistance, and that frames alone resist the full base shear forces. Mixed sentences in resistance Earthquakes, columns, frames + shear walls. Give the code. Columns can be neglected in participation and earthquake resistance, and the research paper on the opposite, and neglecting load-bearing walls in earthquake resistance, where only frames resist earthquakes - What are the effects on the value of the factor “R” and how to take out or enter the stiffness of the walls from earthquake resistance and that the tires They alone resist all the base shear forces ----------- neglecting stone and concrete walls, earthquake resistance only and vertical loads, and the tires alone resist all earthquake forces despite the presence of load-bearing walls only for vertical loads - we have R = 8 in the case of frames. Columns are resistant to moments and earthquakes. We have R = 4. In the case of shear walls without columns, they resist earthquakes. We have R = 6. In the case of double walls and frames, they resist earthquakes. we have R = 7 n the case of two frames and the presence of walls, but the frames resist the entire base shear V without the walls participating