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All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Jurnal Dinamika Penelitian Industri Edukasi Elita : Jurnal Inovasi Pendidikan
Rifki Rifki
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Education Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Other

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Pengaruh Komposit SBR dan Karet Alam dengan Pengisi Karbon Hitam Terhadap Sifat Fisik dan Ketahanan Usang Vulkanisat Nesi Susilawati; Frima Roza; Rifki Rifki; Tri Susanto
Jurnal Dinamika Penelitian Industri Vol 30, No 2 (2019): JURNAL DINAMIKA PENELITIAN INDUSTRI
Publisher : Balai Riset dan Standardisasi Industri Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28959/jdpi.v30i2.5419

Abstract

Peningkatan kualitas tahan panas produk karet berbasis karet alam perlu ditingkatkan melalui pencampuran dengan karet sintetis seperti stirene butadiene rubber (SBR). Karet alam tidak tahan terhadap ozon dan panas, tetapi memiliki ketahanan kikis yang tinggi. Sedangkan karet sintetis tahan terhadap ozon, panas dan ketahanan retak. Penelitian ini bertujuan untuk mempelajari efek penambahan SBR terhadap meningkatnya sifat mekanik fisik. Proses pembuatan vulkanisat dilakukan sesuai dengan ASTM D-3182 dengan variasi perlakuan NR/SBR yaitu 100/0, 70/30, 60/40, 50/50, 40/60 dan 0/100 phr. Hasil penelitian menunjukkan bahwa tegangan putus vulkanisat naik signifikan karena penambahan SBR, walaupun akan berdampak negatif terhadap perpanjangan putus, modulus dan tear strength, namun efek penambahan SBR tidak signifikan untuk parameter kekerasan. Hasil uji pengusangan pada suhu 70 oC selama 72 jam menunjukkan bahwa semakin banyak SBR, sifat ketahanan komposit SBR/NR semakin tinggi. Hal ini diperkuat dengan semakin kecilnya perubahan nilai kekerasan dan perpanjangan putus sebelum dan sesudah pengusangan. 
Pengaruh Penambahan Jumlah User Dan Jarak Pada Komunikasi D2D Unicast Dengan SimuLTE Rifki Rifki; Yusnita Rahayu; Antonio Virdis
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The increased number of users and distance of communication, it caused the network quality decreased in the Device-To-Device (D2D) communication system. In this paper, simulation on D2D unicast by using SimuLTE software is presented. This is in order to evaluate the effect of the number of users and the distance to the quality of D2D network in terms of Channel Quality Indicator (CQI) and Throughput Media Access Control (MAC) on downlink and uplink condition. From the simulation results, the distance which is greater than 50 meters resulted in the decrease of Channel Quality Indicator (CQI). However, Throughput Media Access Control (MAC) on downlink is better than the uplink condition. The increased number of users reduces the MAC throughput in both uplink and downlink conditions. Thus, as a conclusion, the quality of the D2D network has better performance in short distance rather than long distance with a few number of users.Keyword : D2D Communication, SimuLTE, CQI, Throughput MAC
Strategi Pengembangan Kemampuan Public Speaking Dan Dampaknya Terhadap Self Confidence Peserta Didik : (Studi Komparatif MAN 1 Banda Aceh dan MAN 4 Aceh Besar) Rifki Rifki
Edukasi Elita : Jurnal Inovasi Pendidikan Vol. 1 No. 4 (2024): Oktober : Edukasi Elita : Jurnal Inovasi Pendidikan
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/edukasi.v1i4.607

Abstract

This research aims to reveal strategies for developing public speaking skills and describe the impact of public speaking skills on students' self-confidence at MAN 1 Banda Aceh and MAN 4 Aceh Besar. In this research, the methodology used is qualitative with a descriptive approach. The research results show that: (1) The strategy for developing students' public speaking skills at MAN 1 Banda Aceh and MAN 4 Aceh Besar goes through several stages including: planning, methods, implementation and evaluation. (2) The impact of students' public speaking skills at MAN 1 Banda Aceh and MAN 4 Aceh Besar has provided significant results for students. The aspects that include include: being confident in your own abilities, being able to make your own decisions, having a positive feeling about yourself and having the courage to express your opinion to other people. Through this, students succeed in improving their public speaking skills. They are able to organize thoughts clearly, regulate the flow of presentations, and use effective communication techniques. This is related to the application of interpersonal communication theory and effective presentation theory presented in the training. Apart from that, students also succeeded in managing nervousness and anxiety when communicating. They gain a better understanding of the sources of nervousness and techniques for dealing with anxiety. Breathing regulation exercises, muscle relaxation, and other self-control techniques based on communication anxiety theory help students overcome these challenges.
Co-Authors Antonio Virdis Frima Roza Nesi Susilawati Tri Susanto Yusnita Rahayu