scholarly journals Stable Failure-Inducing Micro-Silica Aqua Epoxy Bonding Material for Floating Concrete Module Connection

Polymers ◽  
2015 ◽  
Vol 7 (11) ◽  
pp. 2389-2409 ◽  
Author(s):  
Jang-Ho Kim ◽  
Young-Jun You ◽  
Youn-Ju Jeong ◽  
Ji-Hun Choi
Keyword(s):  
Bonding Material ◽  
Epoxy Bonding ◽  
Micro Silica

EFEKTIVITAS MODEL PEMBELAJARAN KOOPERATIF TIPE TEAMS GAMES TOURNAMENT (TGT) BERBANTUAN MEDIA KARTU SOAL PADA SUB MATERI IKATAN KOVALEN KELAS X MIA DI SMA ISLAM HARUNIYAH PONTIANAK

2018 ◽  
Vol 6 (2) ◽  
Author(s):  
Zulfadhli Abdillah
Keyword(s):  
Student Learning ◽  
Learning Outcomes ◽  
Covalent Bond ◽  
Student Learning Outcomes ◽  
Learning Model ◽  
Covalent Bonds ◽  
Team Games ◽  
Bonding Material ◽  
Before And After ◽  
Tenth Grade

 This  study  is  motivated  by  the  low  learning  outcomes  in  the  Sub-covalent  Bond class of tenth-grade students, SMA Islam Haruniyah Pontianak. This problem is due to the  lack  of  students'  understanding  of  the  concept  of  Covalent  Bonds.  Therefore,  a proper learning model is required to improve students’ understanding of Covalent Bond concepts  based  on  the  characteristics  of  both  learning  materials    and  students.  This study  aimed  to  investigate  the  differences  in  the  student  learning  outcomes  and  the effectiveness of the question card-based on TGT learning in the Sub-covalent Bonding material. Using the pre-experimental method of one-group pretest-posttest design, the tenth-grade  students  of  Math  and  Science  Class  of  SMS  Islam  Haruniyah  Pontianak participated in this study. The data collection tools used were learning outcomes tests, observation sheets, and interview sheets. The results of data analysis revealed that the average  pretest  score  was  36  and  the  posttest  was  62.94.  In  addition,  the  t-test statistical  analysis  indicated  a  significance  value  of  0.00  (0.00  <0.05)  which  meanth that there were differences in student learning outcomes between before and after the question  card-based  TGT  learning  model  implemented.  The  gain  value  was  0.42.  In other words, the  question card-based on TGT learning model is effective in improving the student  learning outcomes with good category. Keywords: Covalent Bond, Question Card, Team Games Tournament (TGT)

Comparative Study on Decapsulation for Copper and Silver Wire-Bonded Devices

2014 ◽  
Author(s):  
François Kerisit ◽  
Bernadette Domenges ◽  
Michael Obein
Keyword(s):  
Comparative Study ◽  
Failure Analysis ◽  
Silver Wire ◽  
Bonding Material ◽  
Bond Wires

Abstract The introduction of silver as bonding material led to new failure analysis issues. This study compares the efficiency of wet and dry chemistries for decapsulation on Cu and Ag-based alloy wires. It is shown that dry chemistry allows better control and selectivity on the EMC/ Cu and Ag-based bond wires.

scholarly journals Investigation of Hydrothermally Stressed Silicone Rubber/Silica Micro and Nanocomposite for the Coating High Voltage Insulation Applications

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3567
Author(s):  
Faiza Faiza ◽  
Abraiz Khattak ◽  
Safi Ullah Butt ◽  
Kashif Imran ◽  
Abasin Ulasyar ◽  
...  
Keyword(s):  
Silicone Rubber ◽  
Structural Changes ◽  
Polymer Chains ◽  
Hydrothermal Conditions ◽  
Silica Filler ◽  
Before And After ◽  
Aging Conditions ◽  
The Stability ◽  
Micro Silica ◽  
Applied Stresses

Silicone rubber is a promising insulating material that has been performing well for different insulating and dielectric applications. However, in outdoor applications, environmental stresses cause structural and surface degradations that diminish its insulating properties. This effect of degradation can be reduced with the addition of a suitable filler to the polymer chains. For the investigation of structural changes and hydrophobicity four different systems were fabricated, including neat silicone rubber, a micro composite (with 15% micro-silica filler), and nanocomposites (with 2.5% and 5% nanosilica filler) by subjecting them to various hydrothermal conditions. In general, remarkable results were obtained by the addition of fillers. However, nanocomposites showed the best resistance against the applied stresses. In comparison to neat silicone rubber, the stability of the structure and hydrophobic behavior was better for micro-silica, which was further enhanced in the case of nanocomposites. The inclusion of 5% nanosilica showed the best results before and after applying aging conditions.

Wafer-level fabrication of GaN-based vertical light-emitting diodes using a multi-functional bonding material system

2009 ◽  
Vol 24 (9) ◽  
pp. 092001 ◽  
Author(s):  
Sang Youl Lee ◽  
Kwang Ki Choi ◽  
Hwan-Hee Jeong ◽  
Hee Seok Choi ◽  
Tchang-Hun Oh ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Material System ◽  
Wafer Level ◽  
Light Emitting ◽  
Bonding Material

Simulation of the Influence of Bonding Materials on the Dynamic Behavior of Laminated Composites

1978 ◽  
Vol 45 (4) ◽  
pp. 822-828 ◽  
Author(s):  
Adnan H. Nayfeh ◽  
Elsayed Abdel-Ati M. Nassar
Keyword(s):  
Wave Propagation ◽  
Dynamic Behavior ◽  
Laminated Composites ◽  
Propagation Process ◽  
Bonding Material ◽  
Mixture Theories

Two model analyses are constructed in order to determine the influence of bonding materials on the dynamic behavior of otherwise bilaminated composites. The geometric arrangement of the composite with the bond is treated as a special type of a trilaminated composite in which each of its major constituents is sandwiched between two bonding layers. In the first model, the recently developed continuum mixture theories of wave propagation in bilaminated composites [2] are extended to treat the trilaminated composite. Here details of the propagation process in the major components and also in the bonding layers are derived. In the second model, the entire effect of the bonds is treated as a modifier to interfacial continuity conditions. In this model the details of the propagation process in the bonding material are ignored. It is found that the results of both models correlate well for relatively thin bonding layers.

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