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All Journal Media Teknik Sipil Jurnal Pertambangan JURNAL ITENAS REKARUPA TAMBANG Jurnal Riset Industri Jurnal Ekonomi Bisnis dan Kewirausahaan Journal TEPAT: Teknologi Terapan untuk Pengabdian Masyarakat Journal Of Informatics And Busisnes
Purwanto .
Fakultas Kedokteran Gigi, Universitas Jember
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Industrial & Manufacturing Engineering Public Health Other

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KAJIAN PENGGUNAAN KARBON AKTIF DAN ZEOLIT SECARA TERINTEGRASI DALAM PEMBUATAN BIOMETHANE BERBASIS BIOGAS Harihastuti, Nani; ., Purwanto; ., Istadi
Jurnal Riset Industri Vol 8, No 1 (2014): Teknologi Proses Berbasis Efisiensi Energi
Publisher : Badan Penelitian dan Pengembangan Industri

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Abstract

Artikel ini merupakan suatu kajian dari hasil-hasil penelitian yang telah dilakukan untuk memurnikan biogas. Kandungn dalam biogas terdapat gas-gas pengotor seperti H2S, CO2, NH3, dan H2O yang apabila tidak dihilangkan dapat mempengaruhi pada proses pembakaran dan menimbulkan kerugian manusia dan lingkungan. Penelitian-penelitian yang telah dilakukan mengenai pemurnian biogas  hanya bertujuan untuk menghilangkan satu atau beberapa komponen gas pengotor secara parsial saja, maka dilakukan kajian ini agar dapat dilakukan penelitian pemurnian biogas secara terintegrasi untuk menghilangkan komponen gas pengotor secara menyeluruh sehingga diperoleh CH4 dengan kemurnian tinggi. Tahapan proses pemurnian  yang dirancangadalah proses kondensasi yang terintegrasi dengan proses adsorpsi menggunakan adsorben karbon aktif dan zeolit, sehingga dihasilkan gas CH4 dengan kemurnian tinggi sebagai biomethane sumber energi terbarukan. Kata kunci: integrasi, adsorpsi, karbon aktif-zeolit, biogas, biomethane 
Jurnal Ekonomi Bisnis Dan Kewirausahaan Vol.III No.2 Januari 2014 Sulistyadi, Kohar; Sukamdani, Nugroho Budisatrio; ., Purwanto; Agustiningsih, Sri Wahyu; Isnaini, Salman Faris; Wahyono, Budi; Nurmansyah, Agung; Isnawati, Kus; ., Nurhayati; Cahyani, Rusnandari Retno
Jurnal Ekonomi Bisnis dan Kewirausahaan Vol 3, No 1 (2014): JBK Vol.3 No.1 Januari 2014
Publisher : Jurnal Ekonomi Bisnis dan Kewirausahaan

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Abstract

Jurnal ekonomi Bisnis dan kewirausahaan ini  Vol  III No 1 ini menghadirkan 6 artikel dari berbagai  Sub disiplin Administrasi bisnis. Artikel pertama berkaitan dengan  dunia kewirausahaan dengan judul  analisis faktor  dominan yang bergaruh terhadap  keberhasilan berwirausaha pada sarjana Universitas Sahid Surakarta, artikel ini merupakan hasil penelitian  dengan metode kuantitatif yang dilakukan oleh Kohar Sulistyadi, Nugroho B Sukamdani. Penelitian tersebut memperjelas bahwa minat sarjana USS dalam berwirausaha masih rendah. beberapa indikasi menunjukkan bahwa karakter wirausaha dari para sarjana maupun mahasiswa USS belum sepenuhnya memahami atas jiwa kewirausahaan yang dicanangkan sebagai Visi dan Misi USS, sehingga perlu usaha keras untuk membangun persepsi dan memperkuat program bisnis center atau inkubator bisnis di lingkungan USS. Artikel kedua berkaitan dengan fenomena underpricing pada perusahaan yang go public di Indonesia, oleh peneliti Purwanto, Sri Wahyu Agustiningsih, Salman Faris Insani dan Budi Wahyono.  Dimana IPO (Initial Public Offering) merupakan salah satu alternatif pembiayaan yang dapat digunakan oleh perusahaan yang telah go public yaitu dengan melakukan penerbitan saham baru untuk dijual di pasar perdana sebelum diperdagangkan di pasar sekunder (bursa efek). Artikel Ketiga adalah Potensi Pariwisata Dalam Perekonomian Indonesiaoleh Agung Nurmansyah. Sedangkan artikel keempat adalah Profitabilitas Perbankan Syariah, Kun Ismawati dan Nurhayati.  Artikel tersebut menganalisis pengaruh Size, Total Equity to Total Assets, Total Loans to Total Assets, dan Total Deposits to Total Assets terhadap ROA (Return on Assets) pada Perbankan Syariah MI dan SM di Indonesia. Artikel terakhir yaitu Pendekatan Supply Chain Management Untuk Meningkatkan Daya Saing Pada Bisnis Bunga Segar oleh Rusnandari Retno Cahyani.
Dampak Konversi Tata Guna Lahan di Daerah Resapan Terhadap Penurunan Cadangan Airtanah di Kabupaten Sleman, Daerah Istimewa Yogyakarta (Effect of Landuse Conversion at Catchment Area to Decrease Groundwater Reserves, In Sleman Regency, Yogyakarta) ., Sutanto; ., Purwanto; Haty, Intan Paramita
PROMINE Vol 3, No 1 (2015): PROMINE
Publisher : Jurusan Teknik Pertambangan FT UBB

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Abstract

Utilization of land use in the Daerah Istimewa Yogyakarta Province resulted in an increase in subsidence and reduced groundwater recharge area of rainwater in catchment areas. The aim of this study was to determine the area of agricultural land were converted to housing, other infrastructure, and the mining area during the last 5 years, as well as to analyze changes in the hydrological system due to land conversion, especially the water supply to the area of the aquifer.     This study is a summary based on secondary data collection, observation and description in the field, measurements of rock permeability and infiltration, as well as laboratory and studio work. Employment in the field is also observed for conversion of land use that occurred and compare the physical properties of rocks before and after conversion. Evaluation is emphasized on the water balance equilibrium calculation has been calculated on the amount of percentage changes in land use and analysis of the impact of the conversion of land use in the catchment area to change the content of groundwater.     Based on the results of the calculation of the projected reserves of groundwater due to land conversion, water reserves and infiltrasiakan volume continued to decline from year to year. This study is expected by the general public is expected to use the existing land well and wisely with regard to groundwater reserves so that it can minimize the reduction in water reserves and infiltration from year to year.Keywords: landuse, groundwater level, catchment area, infiltration, aquifer
Pengaruh Struktur Corporate Governance Terhadap Initial Public Offering (Ipo)Underpricing Di Indonesia ., Purwanto; Agustiningsih, Sri Wahyu; Insani, Salman Faris; Wahyono, Budi
Jurnal Ekonomi Bisnis dan Kewirausahaan Vol 4, No 1 (2015): JBK Vol.4 No.1 Januari 2015
Publisher : Jurnal Ekonomi Bisnis dan Kewirausahaan

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Abstract

This research try to examine whether corporate governance when the company madean Initial Public Offering (IPO) affect the level of underpricing shares of companies that go public by using the period 2002-2012. This study focuses on the influence of corporate governance structure on the level of underpricing by using control variables underwriter reputation, return on assets (ROA), firm size, financial leverage, and return on equity (ROE). According to the results of previous studies, these variables generally tend to show a significant effect on underpricing in companies that go public.            This research is ekspost facto (causal comparative). Sample selection method used was purposive sampling and sample used was 131 sample companies doing an Initial Public Offering on the Indonesia Stock Exchange in the period 2002-2012. This study uses regression testing models. Regression analysis showed that only the underwriter reputation significantly influence underpricin.
JEJAK KARBON PENGOLAHAN SAMPAH DI tps tlogomas malang ., Sunarto; P. Hadi, Sudharto; ., Purwanto
Media Teknik Sipil Vol 12, No 2 (2014): Agustus
Publisher : Department of Civil Engineering, Faculty of Engineering, University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (124.51 KB) | DOI: 10.22219/jmts.v12i2.2291

Abstract

JEJAK KARBON PENGOLAHAN SAMPAH DI tps tlogomas malang Carbon Footprint of Solid Waste Processing At TPS Tlogomas MalangSunarto1, Sudharto P. Hadi2, Purwanto31,2,3Program Doktor Ilmu Lingkungan Universitas DiponegoroAlamat korespondensi : Jl. Imam Bardjo, SH No. 3 Semarang 50241Email: 1) narto@umm.ac.id, 2) sudhartophadi@yahoo.co.id.AbstractWaste sector is one of human activities that cause global warming. Decomposition of organic waste in landfill produces greenhouse gas emissions in the form of biogas consisting of methane and carbon dioxide. Solid waste processing in transfer station in the form of recycling and composting product potentially reduce carbon footprint, directly from the reduction in the volume of waste dumped in landfill and indirectly from the recovery of material. The purpose of this study was to determine the carbon footprint of waste processing at the transfer stations of Tlogomas Malang if developed several scenarios to enhance the capacity of processing. Life cycle approach is used to assess carbon footprint of waste management scenarios with the help of software SWM-GHG Calculator. The results showed that the processing of solid waste at current recycling rate of 40,57% – 80,41% (Status Quo) resulted in net carbon footprint of 1.147 ton CO2–eq /year. Increasing of processing capacity to 60 - 88% (Scenario 1) and 90 - 95% (Scenario 2) would reduce net carbon footprint to 801 ton  CO2–eq /year and427 ton CO2–eq/year respectively. If the processing of waste in transfer station of Tlogomas was discontinued (Scenario 3), net carbon footprint increased to 4,063 t CO2-eq/year.Keywords: carbon footprint, greenhouse gases, solid waste processing, life cycle analysis.AbstrakSektor persampahan merupakan salah satu kegiatan manusia yang menyebabkan pemanasan global. Proses dekomposisi sampah organik pada timbunan sampah menghasilkan emisi gas rumah kaca berupa biogas yang terdiri atas gas methana dan gas karbon dioksida. Pengolahan sampah di TPS untuk produk daur ulang dan kompos berpotensi mereduksi jejak karbon secara langsung dari penurunan volume sampah yang dibuang ke TPA dan secara tidak langsung dari pemulihan material sampah. Tujuan penelitian ini adalah untuk mengetahui jejak karbon pengolahan sampah di TPS Tlogomas di Kota Malang jika dikembangkan beberapa skenario pengolahan untuk meningkatkan kapasitas pengolahan sampah yang telah dilakukan selama ini. Pendekatan daur hidup digunakan untuk menaksir jejak karbon dari beberapa skenario pengolahan sampah di TPS dengan bantuan perangkat lunak SWM-GHG Calculator. Hasil analisis menunjukkan bahwa pengolahan sampah pada saat ini dengan tingkat daur ulang sampah sebesar 40,57% – 80,41% (Status Quo) menghasilkan jejak karbon bersih sebesar 1.147 ton CO2–eq/th. Peningkatan kapasitas pengolahan sebesar 60 – 88% (Skenario 1) dan 90 – 95% (Skenario 2) akan menurunkan jejak karbon bersih menjadi masing-masing sebesar 801 ton CO2–eq/th dan 427 t CO2–eq/th. Apabila pengolahan sampah di TPS Tlogomas dihentikan (Skenario 3), jejak karbon bersih yang dihasilkan meningkat menjadi 4.063 t CO2–eq/th.Kata kunci: jejak karbon, gas rumah kaca,  pengolahan sampah, analisis daur hidup.
Hasil Uji Beda Warna Bahan Alami Sebagai Salah Satu Alternatif Pewarnaan pada Bahan Kain Batik ., Purwanto
Jurnal Rekarupa Vol 5, No 1 (2018)
Publisher : FSRD ITENAS

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Abstract

Pemanfaatan bahan pewarna sintetis pada kain pembuatan batik saat ini memang sudah banyak digunakan karena proses pengerjaan lebih mudah dan tidak memakan waktu serta warna yang dihasilkan lebih cerah dan bervariasi, namun dengan pemakaian bahan pewarna sintetis ini juga menimbulkan efek samping yang bisa mencemari lingkungan dan mengganggu kesehatan. Untuk itu saat ini sudah banyak yang memulai menggunakan pewarna alami dalam pembuatan batik. Salah satu hal penting adalah “masalah lingkungan” sehingga pewarna alami dalam pembuatan batik mulai banyak dilakukan, ada lebih dari 150 jenis tanaman yang bisa menghasilkan warna alami diantaranya daun tom/indigofera (Indigoferaferafera Sp.), kulit buah jalawe (Terminaliabellirica) dan kulit kayu tingi (Ceriops tagal). Tujuan penelitian adalah untuk mengetahui beda warna hasil pewarna alami dari fermentasi daun indigofera, ekstraksi dari kulit buah jalawe dan kulit kayu tingi untuk bahan pewarnaan pada kain batik. Metode yang digunakan dalam penelitian ini adalah dengan proses fermentasi dan ekstraksi bahan alami tersebut, kemudian dilakukan proses  fiksasi (penguncian warna). Hasil penelitian menunjukan bahwa bahan alami indigofera, jalawe dan tingi apabila difiksasi menggunakan tawas akan menghasilkan warna ke arah cerah atau warna muda, sedangkan fiksasi dengan kapur warna akan berubah agak tua dari warna asalnya.  Kata kunci :  batik, fiksasi, pewarnaan alami ABSTRACTThe use of synthetic coloring materials on batik making cloth is now widely used because the process of processing is easier and does not take time and the resulting color is brighter and varied, but with the use of synthetic coloring materials also cause side effects that can pollute the environment and interfere with health . One of the important things is "environmental problems" so that many natural dyes in batik making are starting to be done, there are more than 150 types of plants that can produce natural colors including tom / indigofera leaves (Indigoferaferafera Sp.), Jalawe fruit skin (Terminaliabellirica) and bark high (Ceriops tagal). The purpose of the study was to determine the color differences of natural coloring results from indigofera leaf fermentation, extraction from jalawe fruit peel and high bark for coloring material on batik cloth. The method used in this study is the fermentation and extraction process of natural materials, then the fixation process. The results showed that the natural ingredients of indigofera, jalawe and high when fixed using alum will produce a bright or light color, while fixation with lime color will change a little older than the original color. Then fixation with chalk will lead to older or darker colors.  Keywords : batik, fixation, natural coloring
PENGARUH TINGKAT PELAPUKAN BASAL TERHADAP KEKUATAN BATUAN MENGGUNAKAN UCS DAN SCHMIDT HAMMER Sofyan, A.; ., Purwanto; Qaidahiyani, N. F.
Jurnal Pertambangan Vol 8 No 1 (2024): Februari 2024
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v8i1.1651

Abstract

Batuan sebagai bagian yang inheren terhadap struktur bangunan memiliki peran yang fundamental dalam perancangan konstruksi, baik pada bidang sipil maupun pertambangan. Kabupaten Gowa khususnya Kecamatan Pattalassang menjadi salah satu pusat penambangan batuan yang banyak didistribusikan ke beberapa wilayah sekitarnya. Parameter kekuatan selain dipengaruhi jenis batuan, juga dipengaruhi oleh tingkat pelapukan batuan. Ketidakseragaman pada pelapukan batuan membuat terjadinya variabilitas kekuatan batuan. Penelitian ini bertujuan untuk mengidentifikasi derajat pelapukan pada batuan hasil penambangan di Kabupaten Gowa berdasarkan hasil pengamatan lapangan dan laboratorium, menganalisis pengaruh derajat pelapukan terhadap kekuatan batuan menggunakan uji kuat tekan uniaksial, dan menganalisis kekuatan batuan menggunakan analisis regresi linear pada nilai kuat tekan uniaksial terhadap nilai pantul Schmidt Hammer berdasarkan derajat pelapukannya. Metode pengujian yang digunakan pada penelitian ini adalah menentukan derajat pelapukan menggunakan analisis XRD dan pengamatan mikroskopis, uji sifat fisik batuan, uji kuat tekan batuan menggunakan mesin UCS, pengujian nilai pantul Schmidt Hammer, dan analisis regresi linear korelasi. Hasil penelitian menunjukkan bahwa terdapat 4 jenis derajat pelapukan yaitu derajat pelapukan II, derajat pelapukan III, derajat pelapukan IV, dan derajat pelapukan V. Pengaruh derajat pelapukan terhadap nilai kuat tekan uniaksial menunjukkan pengaruh yang kuat negatif (berbanding terbalik) dimana nilai kuat tekan uniaksial akan menurun seiring meningkatnya derajat pelapukan batuan. Hasil analisis regresi linear sederhana nilai kuat tekan uniaksial terhadap nilai pantul Schmidt Hammer berdasarkan derajat pelapukan adalah UCS = 1,1478 SCH + 39,464, dengan nilai koefisien determinasi (R2)adalah 0,9271, dan koefisien korelasi (R) adalah 0,9628.
Pengenalan Karakteristik Mineral dan Batuan Bagi Siswa Jurusan Geologi Pertambangan SMK Penerbangan Techno-Terapan Makassar Amalia, Rizki; ., Sufriadin; ., Purwanto; Sutardjo Tui, Rini Novrianti; Hatta, Asta Arjunoarwan; Nur, Irzal; Ramli, Muhammad; Anas, Aryanti Virtanti; Widodo, Sri; Alvionita, A. Febbi; Gunawan, Syahrul; Aditya, Dzulkifli
JURNAL TEPAT : Teknologi Terapan untuk Pengabdian Masyarakat Vol 8 No 1 (2025): Community Empowerment through Higher Education Community Service Programs
Publisher : Faculty of Engineering UNHAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jurnal_tepat.v8i1.563

Abstract

Minerals and rocks are knowledge that everyone who wants to work in the mining industry must know. This community service activity aims to improve the understanding and skills of students majoring in Mining Geology at SMK Techno-Terapan Makassar in describing the characteristics of minerals and rocks. The problems faced by partners are the lack of laboratory facilities and the dominance of theoretical learning so practicums are not optimal. This training involved 39 students who were guided by lecturers and students from the Department of Mining Engineering, at Hasanuddin University. The training method includes material presentation, rock description tutorials, and mineral identification using 18 igneous, sedimentary, and metamorphic rock samples. Assessment is carried out through pre-test and posttest to measure participants' understanding. The results show an increase in the average score from 6.31 to 7.56, with a maximum score of 10, although not significant for some participants. Apart from providing increased understanding, this activity hands over rock samples to partners for further learning. In conclusion, this training is effective in improving students' practical skills related to minerals and rocks, which is an important provision for their future in the mining-geology field.
Aplikasi Pemesanan Makeup Artist Berbasis Mobile Pada Anida Makeup Anida Hasna Nur Fadhila; Haryanti, Tri; ., Purwanto
Journal Of Informatics And Busisnes Vol. 3 No. 3 (2025): Oktober - Desember
Publisher : CV. ITTC INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47233/jibs.v3i3.3545

Abstract

The Makeup service industry is growing in line with increasing customer demand for practical and fast services. However, at Anida Makeup, the ordering process is still manual, with PDF price lists sent via private message, making it inefficient and making it difficult to update information. This study aims to develop a mobile-based Makeup artist ordering application that can facilitate customers in obtaining service information and placing orders directly. The research method uses a qualitative and quantitative approach (Mixed Methods). Qualitative data collection includes observation, interviews, documentation, and literature studies as the primary data collection method. The quantitative approach focuses solely on questionnaire data collection using a Likert scale. The application was developed using a prototyping model with stages of needs analysis, design using Unified Modeling Language (UML), implementation using Flutter, Dart, and MySQL, and supported by XAMPP and Visual Studio Code software. Testing was conducted using blackbox and questionnaires. The test results showed an average score of 90% from customers and 90% from administrators. This indicates that the system is capable of improving the efficiency of the Makeup ordering process for users. Furthermore, the system also helps business owners improve operational efficiency and manage order data in a more structured manner.
Prediksi Kelulusan Siswa Berdasarkan Data Akademik Dan Keaktifan Menggunakan Algoritma Random Forest Berbasis Streamlit Eko Wendiawan; ., Purwanto; Ulkhaq, Muh Zia
Journal Of Informatics And Busisnes Vol. 3 No. 3 (2025): Oktober - Desember
Publisher : CV. ITTC INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47233/jibs.v3i3.3569

Abstract

Education holds a central position in the development of citizens and the nation. According to the Ministry of Education and Culture (KEMENDIKBUD), the graduation rate at vocational high schools (SMK) is only 65%. This study was conducted at SMK Ma’arif NU 01 Karangkobar with the objective of implementing an early student graduation prediction system based on academic performance and engagement data. A Streamlit-based Random Forest algorithm was applied to enable schools to anticipate students at risk of not graduating on time and to reduce cases of conditional graduation. The research employed a Research and Development (R&D) methodology with a quantitative descriptive and applied experimental approach. Data were collected through interviews, observations, questionnaires, and literature review. The system was developed using the Waterfall model through the stages of Requirement Analysis, System Design, Implementation, Integration, and Testing. System design involved Data Flow Diagrams (DFD) at Levels 0–3 and Entity Relationship Diagrams (ERD), while the implementation was carried out using the Python programming language, the Streamlit framework, and libraries such as pandas, numpy, and scikit-learn. The user interface was designed using Figma, and diagrams were constructed with Draw.io. Evaluation results based on the Likert scale showed that the system achieved an overall satisfaction rate of 93% from a total of 35 respondents, consisting of 29 student respondents with 93% satisfaction and 6 teacher respondents with 95% satisfaction. This achievement falls into the “very good” category. These findings indicate that the graduation prediction system can effectively support schools in taking anticipatory measures and providing more targeted student guidance, thereby potentially improving the effectiveness of graduation management at the vocational high school (SMK) level.
Co-Authors ., Sufriadin A. Sofyan Aditya, Dzulkifli Agung Nurmansyah Alvionita, A. Febbi Anida Hasna Nur Fadhila Aryanti Virtanti Anas Budi Wahyono, Budi Eko Wendiawan Gunawan, Syahrul Hatta, Asta Arjunoarwan I. Istadi Intan Paramita Haty Irzal Nur, Irzal Kohar Sulistyadi Kus Isnawati, Kus Muhammad Ramli Nani Harihastuti, Nani Nugroho B Sukamdani Nurhayati . Qaidahiyani, N. F. Rini Novrianti Sutardjo Tui Rizki Amalia Rusnandari Retno Cahyani Salman Faris Insani, Salman Faris Salman Faris Isnaini, Salman Faris Sri Wahyu Agustiningsih, Sri Wahyu Sri Widodo Sudharto P. Hadi, Sudharto Sunarto . Sutanto . Tri Haryanti Ulkhaq, Muh Zia