Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Hasan, Ahmed A."'
Publikováno v:
International Journal of Aeronautical and Space Sciences. 20:913-932
It is well known that the selection of a frequency for signal generation and data acquisition significantly affects the quality of ultrasonic or laser ultrasonic nondestructive testing (NDT) results, and the analog filter is essential to prevent the
Publikováno v:
Electronics Letters. 56:1027-1029
The full-field pulse-echo ultrasonic propagation imaging (PE UPI) system using a two-axis linear stage has been successfully used to perform a non-destructive evaluation of flat specimens. This study used a six-axis robot arm to develop a robotic sca
Publikováno v:
Materials, Vol 13, Iss 4752, p 4752 (2020)
Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Materials
Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Materials
This paper presents a literature review concerning the characteristics of MgO (magnesium oxide or magnesia) and its application in cementitious materials. It starts with the characterization of MgO in terms of production processes, calcination temper
Publikováno v:
Composite Structures. 276:114592
Composite lattice-skin structures have been widely used in the aerospace industry to reduce structure weight and fabrication cost. The filament winding technique can be used to manufacture them automatically. However, several defects can occur in eve
Publikováno v:
Journal on Today's Ideas - Tomorrow's Technologies. 5:123-140
Wave energy is the most available energy associated in deep water seas and oceans. Therefore, many attempts have been applied to capture these energies. This paper describes the design, construction and testing of water wave flume. The water wave flu
Publikováno v:
Measurement. 176:109109
This paper proposes a system for a laser ultrasonic inspection of fixed non-planar composite structures. A pulse-echo configuration is used by which both the sensing and excitation lasers hit the same point on the structure, utilizing bulk waves for
Publikováno v:
2018 10th International Conference on Electrical and Computer Engineering (ICECE).
Different characteristics of AlGaN/GaN and AlInN/GaN high electron mobility transistors (HEMTs) are compared in this paper. For two dimensional electron gas (2DEG) density calculation of AlGaN/GaN HEMT, we used AlGaN barrier with different Al composi
Publikováno v:
Composite Structures. 236:111871
In this paper, we introduce a rotational through-transmission ultrasonic propagation imaging system to inspect the full thickness of the entire cylindrical section of filament-wound composite overwrapped pressure vessels. This system can achieve high
Publikováno v:
Active and Passive Smart Structures and Integrated Systems 2017.
This paper proposes a full-field pulse-echo ultrasonic propagation imaging (FF-PE-UPI) system for non-destructive evaluation of structural defects. The system works by detection of bulk waves that travel through the thickness of a specimen. This is a
Publikováno v:
2017 International Conference on Current Research in Computer Science and Information Technology (ICCIT).
Play Fairal gorithm has been enhanced in various ways. One of the methods is to increase the confusion rates by transforming the algorithm into 3D-playfair which has four tables of 4×4 and accepts trigraph rather than digraph. This paper further enh