wave propogation
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Author(s):  
Hadi Prayitno ◽  
Muhammad Amril Siregar ◽  
Muhammad Habib Yusdartono ◽  
Iswandi Idris ◽  
Rizaldy Khair

Pentingnya Media Pembelajaran dimanfaatkan oleh ATKP Medan untuk terus meningkatkan mutu pembelajaran,  Permasalahan yang sering dijumpai dalam pembelajaran avionic adalah keterbatasan resource yang ada karena untuk mengakses pembelajaran avionic para taruna harus mengakses dari LAB CBT dan tidak bisa dari tempat lain. Hal ini disebabkan software Avionic hanya terpasang didalam lab dan tidak bisa dipelajari dari luar lab. Tujuan dalam penelitian ini adalah meningkatkan proses pembelajaran avionic- Radio Theory I secara digital yang dkemas dalam animasi multimedia untuk Memudahkan para taruna untuk mempelajari avionic Radio Theory I tanpa harus akses di laboratorium. Metode yang digunakan dalam penelitian ini adalah menggunakan Dengan menggunakan metode Multimedia Development Life Cycle MDLC  yaitu metode Konsep (Concept), perancangan (desain), pengumpulan bahan (material collecting), pembuatan (assembly), pengujian (testing), distribusi (distribution). Video yang dihasilkan terdiri dari 4 sub video yaitu Introduction, Radio Wave Propogation, Effects of Athmosphere dan Polarization, dengan durasi 3 menit 28 detik.


APAC 2019 ◽  
2019 ◽  
pp. 65-70
Author(s):  
L. L. Tong ◽  
J. H. Zheng ◽  
J. S. Zhang ◽  
F. S. Qian

Author(s):  
A.S. Yashchenko ◽  
◽  
S.V. Krivaltsevich ◽  
T.A. Belyaeva ◽  
◽  
...  
Keyword(s):  

Author(s):  
Ying Wang ◽  
Shuai Xu ◽  
Zishun Liu ◽  
Teng Yong Ng

This study investigates the distribution and propagation of potential energy in graphene under tearing loads. Before crack extension, high potential energy accumulates at the crack tip. The distributions of the high potential energy are symmetrical and asymmetrical in pristine graphene and bi-crystal graphene with misorientation angle of [Formula: see text], respectively. When a C–C bond breaks during the fracture of graphene, numerous energy waves successively arise from the crack tip, i.e., the two atoms linked by the broken bond. These atoms lose one bond constraint and turn into unstable states, and they displace with high accelerations. In pristine graphene, the energy waves present as hexagonal geometries, while the waveforms near the loading areas are compressed to flatter geometries. In bi-crystal graphene, the refractions of potential energy waves are observed when the energy waves propagate to the grain boundary (GB) and interact with it, and the waveforms are changed after the wave crosses the GB. For both pristine graphene and bi-crystal graphene, wrinkles are generated when the crack tip extends to the site sufficiently close to the vertical free boundary, and the wrinkles are always nearly parallel to the horizontal free boundary and move along with the motion of the crack tip.


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