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ANALISIS WAKTU PELAPISAN NIKEL PADA ALUMINIUM ALLOY 2024 TERHADAP UJI KEKERASAN VICKERS DENGAN MENGGUNAKAN PROSES ELEKTROPLATING Reza Setiawan; Sehono Sehono; Ferry Setiawan
Teknika STTKD: : Jurnal Teknik, Elektronik, Engine Vol 8 No 1 (2022): Vol 8 No 1 (2022): TEKNIKA STTKD: JURNAL TEKNIK, ELEKTRONIK, ENGINE
Publisher : Sekolah Tinggi Teknologi Kedirgantaraan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (787.983 KB) | DOI: 10.56521/teknika.v8i1.620

Abstract

Elektroplating adalah metode finisihing yang digunakan untuk menaikkan sifat dan tampilan dari logam, hal ini dikarenakan logam utama akan dilapisi oleh ion-ion logam jenis lain. Dengan adanya proses elektroplating dapat memberikan sebuah metode yang relatif mudah dan murah untuk menaikkan sifat dan tampilan dari logam. Prinsip dasar dari elektroplating adalah logam yang ada dibagian katoda akan melepaskan ion-ion untuk selanjutnya menempel pada logam yang dihubungkan dengan anoda. Proses ini akan berjalan secara terus menerus sampai dengan arus listrik yang dialirkan dimatikan. Pada penelitian ini dilakukan proses elektroplating dengan menggunakan aluminium 2024 sebagai logam utama dan nikel seabagai logam pelapis. Variasi dari waktu yang digunakan pada proses elektroplating adalah 20 menit, 30 menit, dan 40 menit. Setelah dilakukan proses elektroplating maka selanjutnya aluminium dilakukan uji kekerasan untuk mengetahui dampak dari variasi waktu proses elektroplating. Dari hasil pengujian kekerasan menggunakan metode Hardness Vickers maka spesimen dengan nilai tertinggi terdapat pada variasi waktu 20 menit dengan nilai 328,11 kgf/mm, sedangkan yang paling rendah terdapat pada variasi 40 menit dengan nilai 140.445 kgf/mm. Dari hasil foto mikro juga menunjukkan bekas indentor pada variasi 40 menit memiliki lubang terbesar sedangkan pada waktu 20 menit yang paling kecil. Sehingga semakin lama dari proses elektroplating akan menurunkan nilai kekerasan dari aluminium alloy 2024 yang dilapisi dengan nikel.
Analysis of Indonesia's Three Major Anthropogenic Pollutants Which Include Various Emission and Fuel Sectors in the 1990-2015 Period Sunarno, S.; Purwanto, P.; Warsito, B.
Jurnal Pendidikan IPA Indonesia Vol 11, No 2 (2022): June 2022
Publisher : Program Studi Pendidikan IPA Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpii.v11i2.33224

Abstract

The rapid industrial growth and urbanization in Indonesia over the last two decades have resulted in a significant increase in air pollution, so it has caused a decrease in air quality. An air pollution inventory is needed to determine the level of air quality, emission sector, and the type of pollutant fuel. Air pollutant emission data were obtained from various sources, including Regional Emissions Inventory in Asia (REAS) V3.1, Database Emissions for Global Atmospheric Research (EDGAR) V4.3.2, and Community Emissions Data System (CEDS) V1.0. The data consists of 3 types of emitted pollutants (CO, NOX, and SO2) and two contributing factors (emission and fuel sectors). This study aims to compare data from the emission sources of the three air pollutants, determine the trend of changes in the emission of the three pollutants, and determine the main sectors and fuels that emit the three air pollutants. This research uses the literature study method to collect, visualize, and analyze data. The results showed that between 2005 and 2012, there was a downward trend in emissions in the industrial sector for CO, NOX, and SO2 gases, with the lowest point in August. This is because many industrial sectors have applied the principle of clean energy to reduce air pollution and create clean air. However, the transportation sector showed an increase in CO and NOX emissions and peaked in April and October. Furthermore, the SO2 emissions for the power generation sector fluctuated and peaked in July.
Environmental Pollution from Cane Sugar Factories: A Study of Chemical Features Variations in the Wastewater Khair, A. S. E.; Elfaig, A. H. I.; Yassen, M. E.; Purwanto, P.; Sunoko, H. R.
Jurnal Pendidikan IPA Indonesia Vol 12, No 1 (2023): March 2023
Publisher : Program Studi Pendidikan IPA Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpii.v12i1.40116

Abstract

Sugar industry processes release large amounts of wastewater and pollution concentrations. This study focuses on environmental pollution produced by a cane sugar factory (Sampling Assalaya factory) with particular emphasis on the chemical properties of wastewater as an essential feature identifying water pollution in the study area. The study aims to analyze wastewater’s chemical features and disparity based on the Sudanese Standards and Metrology Organization (SSMO) standards. The systemic random sampling method collected twenty samples for each parameter (pH, Total Hardness, PO4, BOD, and COD). Analyses were conducted in the laboratory according to the standard methods for examining water and wastewater (USA). Results revealed significant variations in wastewater features at different sampling sites as pH values ranged between 4.55 to 8.39 and PO4 ranged between 0.097 ppm to 670 ppm in the selected sites. Results also pointed out that Total hardness ranged between 50ppm to 470ppm, BOD ranged between 15ppm to 390ppm, whereas the COD in 80% of the tested samples exceeded the SSMO standard (150ppm). The article concluded that these levels are highly exceeding the recommended level by SSMO. The leading causes of such alarming pollutant levels are related to the effluent of the Assalaya sugar factory in the study area. To reduce such effluent pollution levels, suggestions are made for the Assalaya cane sugar factory to treat its effluent by introducing appropriate technology and methods, such as anaerobic treatment. The Assalaya sugar factory ought to keep up with the transformation to green production as an integral part of its policy to achieve sustainability.
Super Graceful Labeling For A Class of Trees Purwanto, P; Rahayu, Ariska Puji
Prosiding Konferensi Nasional Penelitian Matematika dan Pembelajarannya 2019: Prosiding Konferensi Nasional Penelitian Matematika dan Pembelajarannya
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (591.652 KB)

Abstract

Let be a graph having vertex set , edge set , number of vertices | | , and number of edges | | . A super graceful labeling is a bijection function such that | | for every . A graph is called a super graceful graph if it admits a super graceful labeling. A tree is a tree obtained from a star on vertices by joining each vertex (one vertex if ) of degree 1 , , , to different new vertices . Super gracefulness of many classes of graphs, including special classes of trees, has been studied in the literature. In this paper we present a super graceful labeling of the tree .
Studi Komparasi Keterampilan Komunikasi Matematis Siswa Dengan Pembelajaran Kooperatif 5E Dan STAD Ardina, Fimmatur Rizka; Purwanto, P; Sa'dijah, Cholis
Prosiding Konferensi Nasional Penelitian Matematika dan Pembelajarannya 2016: Prosiding Konferensi Nasional Penelitian Matematika dan Pembelajarannya
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Jenis penelitian yang digunakan dalam artikel ini adalah penelitian kajian teori. Tujuan penelitian ini adalah untuk membandingkan kemampuan model pembelajaran kooperatif tipe 5E dan STAD dalam meningkatkan keterampilan komunikasi matematis siswa. Komunikasi matematis ini difokuskan pada komunikasi matematis lisan dan tulisan. Adapun indikator kemampuan komunikasi lisan dan tulisan yang diturunkan dari NCTM (2000) adalah sebagai berikut. Indikator kemampuan komunikasi matematika tulis yaitu: (1) menyatakan benda nyata, gambar, dan diagram ke dalam ide matematika, (2) menyatakan peristiwa sehari-hari dalam bahasa atau simbol matematika Sedangkan indikator kemampuan komunikasi lisan, yaitu: (1) menjelaskan ide matematis secara koheren dan jelas kepada teman, guru dan orang lain, dan (2) menganalisis dan menilai pemikiran dan strategi matematis orang lain. Proses membandingkan dalam penelitian ini akan didasarkan pada penelitian-penelitian terdahulu dan juga berdasarkan teori-teori tentang pembelajaran kooperatif tipe 5E dan STAD. Hasil dari penelitian kajian teori ini adalah model pembelajaran kooperatif tipe 5E lebih dapat meningkatkan keterampilan komunikasi matematis tulis siswa dibanding STAD.
Students’ semantic reasoning characteristics on solving double discount problem Prayitno, Lydia Lia; Mutianingsih, Ninik; Purwanto, P; Subanji, S; Susiswo, S
JRAMathEdu (Journal of Research and Advances in Mathematics Education) Volume 7 Issue 2 April 2022
Publisher : Lembaga Pengembangan Publikasi Ilmiah dan Buku Ajar, Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/jramathedu.v7i2.16325

Abstract

Semantic is associated with the relationship between symbol, reference, and the problem’s context involved in the problem-solving process which also involves reasoning and decision-making. Hence, this study describes the characteristics of students’ semantic reasoning to solve the double discounts problem. 51 high school students in Sidoarjo participated in this qualitative study. The data were collected through 15-20 minutes problem-solving tests. The students' answers were grouped into correct and wrong answers. The correct answers were then regrouped once more based on the strategies used by the students to answer the test and to identify their semantic reasoning characteristics. The data were analyzed by reducing, classifying the think-aloud and also by observing. Then the similarity of characteristics of students' semantic reasoning when solving the double discount problem was identified. To test the accuracy of the data, a triangulation method was used. This semantic reasoning was identified by (1) giving the problem situation, (2) stating the keywords and their meaning, (3) stating the relationship, (4) transforming it into a mathematics statement, (5) calculating based on their strategies, (6) decision making, and (7) completing the answer interpretation. This study contributes to developing basic knowledge in interpreting each process of solving ill-structured problems until finding a solution.
What Matters More: Religious Values or Academic Excellence?A Conjoint Analysis of Parental Priorities in Islamic Education Murti, Anjani Wira; Purwanto, P; Diharto, Awan Kostrad; Ramdhani, Deddy; Alauddin , Muhammad Badat
Suhuf: International Journal of Islamic Studies Vol. 37 No. 1 (2025): May
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/suhuf.v37i1.10576

Abstract

This study investigates parental preferences in selecting integrated Islamic educational institutions in Mataram, West Nusa Tenggara, particularly among career-oriented parents who face challenges in directly supervising their children’s education. The research aims to identify the most dominant attribute influencing parental preferences and to evaluate the extent to which these attributes contribute to the decision-making process. A quantitative method was employed using conjoint analysis. Data were collected from 100 mothers of kindergarten-aged children residing in Mataram, selected through quota sampling. A questionnaire was used for data collection, and the analysis was conducted using conjoint analysis with a multiple linear regression approach via SPSS. The results indicate that among six evaluated attributes; school quality, teacher quality, school image, service quality, location, and cost only teacher quality and school location significantly influence parental preferences. Among these, teacher quality emerged as the most dominant factor. Collectively, the six attributes accounted for 76.8% of the variance in parental preference, while the remaining 23.2% was influenced by factors outside the research model. These findings underscore the importance of teacher competence and accessibility in shaping school choice decisions, offering valuable insights for educational institutions aiming to attract and retain students through improved staffing and strategic location planning.
Respon Denyut Jantung dan Frekuensi Pernafasan Sapi Bali Berdasarkan Perubahan Suhu dan Kelembaban Udara di Daerah Beriklim Tropika Basah Menggunakan Artificial Neural Network Yani, A.; Al-Zahra, W.; Purwanto, P.
Jurnal Ilmu Produksi dan Teknologi Hasil Peternakan Vol. 1 No. 1 (2013): Jurnal Ilmu Produksi dan Teknologi Hasil Peternakan
Publisher : Department of Animal Production and Technology, Faculty of Animal Science, IPB University in associated with Animal Scientist's Society of Indonesia (HILPI)

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Abstract

Co-Authors -, Chahyono A. Yani Abd. Rasyid Syamsuri Abdul Basit Abdul Haris Nasution Abdul Latief Abdul Rahim Abdul Wahab Syakhrani Achmad Fikri Syarif Ade Rahmi Adi Neka Fatyandri Agung Ari Chandra Wibawa Agung Prabowo Agustinus Fritz Wijaya Ahmad Baihaqi Ahmad Subulas Salam Al-Zahra, W. Alaa, Siti Alauddin , Muhammad Badat Anggun Kurniawan Ani Heryani Anton Winarko Arfidawati, Sri Ari Dina Permana Citra Ari Nuswantoro Arif Bintoro Johan Arifah, Auliyah Armas Arifin Arbunowo Armas Arifin Arbunowo Arnold Kaudin Arum Yumastuti Arwini Puspita Asmendri Asmendri Astriyani, Erna B Budiyono Bagus Panuntun Bambang Sudiyono Birmanti Setia Utami Boromeus, Supartomo Corolus Budi Santosa Budi Santosa Camberlin, Camberlin Cholis Sa’dijah Christmas, Sandy Kurnia Cokro Aminoto Damayanti, Elok Dany Eka Parasetia Deni Setyowati Desi Wahyumarniasari Desyarti, Neza Devi Nurfitri Bintang Diah Astutiningrum Diah Kristina, Diah Didi Dwi Anggoro Diharto, Awan Kostrad Dinasti Aprillia Dinasty Putri, Fia Amorita Dinda Paramitha Dipta Wana Anandita, Dipta Wana Durri Andriani, Durri Dwi Purwantoro Sasongko Eka Riyanti Eko Sediyono Elfaig, A. H. I. Elfrida Yuliana Endang Fatmawati Endang Purwaningsih Endriatmo Soetarto Ernawati Ernawati Faradies Arija Farah Diena Amelia Fariz, T. R. Fathoni, Rif'an Fauzi Kurniawan Feliatra Ferry Setiawan Fimmatur Rizka Ardina, Fimmatur Rizka Fitro Nur Hakim Freyti Mariyani Emanuela Tumanduk Gagah Hasan Basrori Gita Lokapuspita H Sukardi H. Hadiyanto H. R. Sunoko, H. R. Haeril, Haeril Hafiziani Eka Putri, Hafiziani Eka Hamid, Sundari Hamsiah, Andi Handayana, I Gusti Ngurah Yudi haryo kusumo Hasanah, Raudhatul Henderina Oualeng Hente, Asri Heriyanti, A. P. Hermawan, Hermawan Hikmawati Hikmawati I Made Dedy Ariawan I. Istadi Idat Muqodas Ika A. Rini, Ika A. ike mardiati agustin Ikhbariaty Kautsar Qadry Indirani Wauran, Indirani Indro Sumantri Irfadat, Taufik Irma Suciana Isril " Iwan Nugroho Iwan Triyuwono Jacob Daan Engel Jahada, Jahada Jubhar Mangimbulude Judhistira Aria Utama Jumadi Jumadi Kamengon, Dytharia Grace kareviati, evie Khair, A. S. E. Luqman Buchori Lydia Lia Prayitno, Lydia Lia M. Suqran Alkausar S Maemunah Mailin, Mailin Malau, Ribut Alam Marwati - Maryono Maryono Mashadi ., Mashadi Mega Kusuma Putri Megawati, Fitria Melia Ariyanti Melia Ariyanti Melia Ariyanti, Melia Mirna Taufik Mirza Hayati Mita Anggraini Mochamad Arief Budihardjo Muh Rasyid Ridha Muh Yusran Yunus Muhaimin Rifa’i Muhajir, Ichsan Muhammad Askari Zakariah Muhammad Daud MUHAMMAD MANSUR Muhammad Zakariah Muharam, La Ode Mulyani Fahrin, Sri Murti, Anjani Wira Musawwir, Musawwir Muslimin Muslimin Nararya Adi Prasetya Ni Luh Ari Yusasrini Ni Made Dewi Wahyuni, Ni Made Dewi Ni Made Sukma Sanjiwani NI PUTU AYU MIRAH MARIATI Ni Wayan Trisna Dewi Ning Iswati Ninik Mutianingsih, Ninik Noviyanti Noviyanti, Noviyanti Nur Santy Abidin Paramitha, Dewa Ayu Ika Petrus Jacob Pattiasina Pratikso Pratikso Pratiwi, Hardiyanti Purnaweni, H. Purnomo Purnomo Purwoko, Agus Putri, Rafika Chudriana R Ritaningsih R. Hadiwijoyo R. Prabowo, R. Rahayu, Ariska Puji Rahmadi Jasmin Rahmah Rahmah Rahmat Azhari Kemal Rahmat, Stephanus Turibius Raihan Putri Ramdhani, Deddy Rame Rame Rame Rame Rini Darmastuti Rispiandi Rispiandi Robiyanto Romdoni, Mochamad Yusuf Romeon, Nesti Rostini Rudi Yuniarto Adi Ruhiawati, Irma Yunita Ruli Fatmawati, Ruli S Suherman S Suherman S.L, Irawan Safei Purnama Salim Mustofa Sanjiwani, Ni Made Suksma Saraswati, Rina Sarwoko Mangkoedihardjo SATRIYAS ILYAS Sehono Semuel Sander Erari Setyawati, Iin Sevnat Jambormias Simorangkir, Faber Simorangkir, Faber Sisilia Siwi Purnawati Siska Gita Pratiwi Sitti Nur Djannah Slamet Supriyadi Subanji, S Suciaty Fitriani Purba Sudarno Sudarno Sudarno Sudarno Sudarno Sudarno Sudharto P. Hadi Sugito Sugito Suhaedir Bachtiar Suko Pratomo Sultan Sultan Sunarno - Suryadi Suryadi Susilawati, Yanti Susiswo, S Suwandi, Edy SUWIJIYO PRAMONO Tamaulina Br Sembiring Tati Sumiati Tauhid, Tauhid Teuku Irfan Maulana Thontowi Djauhari Tri Ardyati Tri Mulyaningsih Unggul P. Juswono Victor Gayuh Utomo Wahyudy, Mukhamad Ady Waladani, Barkah Waliadi Gunawan Warsito, B. Wibawa, Agung Ari Candra Wildoms Sahusilawane Wiwik Puspita Dewi Wulandari, Ni Kadek Lia Wuri Utami Wuri Utami Yanuar, Masnia Mahardi Yassen, M. E. Yayi Suryo Prabandari Yulia Yulia Yuliawati Yulinda Destiany Yunasfi -, Yunasfi Yunasfi . Yuyu Hendawati, Yuyu ZAMAN, Badrus