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All Journal Kultivasi G-Tech : Jurnal Teknologi Terapan Jurnal Teknik Industri Terintegrasi (JUTIN) OrchidAgro Jurnal Sains dan Ilmu Terapan Abdimas Terapan: Jurnal Pengabdian Kepada Masyarakat Terapan Jurnal Polimesin
Romiyadi Romiyadi
SMP Negeri 21 Semarang
Religion Agriculture, Biological Sciences & Forestry Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences

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Keragaan tiga jenis planlet anggrek Phalaenopsis asal Protocorm yang diinduksi Ethyl Methyl Sulfonate (EMS) secara in vitro Romiyadi, Romiyadi; Komariah, Ai; Amien, Suseno
Kultivasi Vol 17, No 1 (2018)
Publisher : Fakultas Pertanian UNPAD

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1018.873 KB)

Abstract

Abstract. This research was conducted to determine the effect of concentration of Ethyl Methyl Sulfonate (EMS) to performance of three types of Phalaenopsis Planlets and to know the optimum concentration of EMS on any type of Phalaenopsis orchids. The experiment was conduc-ted at Tissue Culture Laboratory of the Faculty of Agriculture, Winaya Mukti University, Sumedang. It used a completely randomized design (CRD) with factorial pattern, that consisted of two factors and replicated twice.The first factor was the type of Phalaenopsis that resulted form hybridization which consisted of v1 (Phalaenopsis 717 X Phalae-nopsis Fire Bird), v2 (Phalaenopsis Tianong Rose X Sibling), and v3 (Phalaenopsis Luchia Pink X Phalae-nopsis Chain Xen Mammon). The second factor was the concentration of EMS that consisted of e0 (0% EMS/control), e1 (0,05% EMS), e2 (0,10% EMS), e3 (0,15% EMS), e4 (0,20% EMS), and e5 (0,25% EMS). Explant protocorm of three types of Phalae-nopsis soaked in a solution of EMS by each treat-ment for 3 hours, and cultured on MS medium Basal Modified Multiplication Shoot for 10 weeks. The experimental results showed that there are interaction between the three types of Phalae-nopsis result of a cross with a concentration of EMS to variable number of roots. Orchids P. 717 X P. Fire Bird had higher  number of leaves, number of roots, leaf leang, and root length than the other. The result showed that there were interaction between three species of Phalaenopsis orchid from the crossing with EMS concentration on root variables. Orchid P. 717 X P. Fire Bird has the number of leaves, the number of roots, the number of shoots, leaf length and root length better than other types. EMS concentrations independently at all levels of treatment can not increase the number of leaves, the number of roots, fresh weight of planlet, leaf length, and root length.Keywords: Phalaenopsis, the concentration of EMS, in vitro cultureSari. Penelitian ini mempelajari dan mengetahui pengaruh konsentrasi Ethyl Methyl Sulfonate (EMS) terhadap keragaan planlet tiga jenis anggrek Phalaenopsis asal protocorm dan mencari konsentrasi optimum EMS untuk setiap jenis anggrek Phalae-nopsis secara in vitro.Percobaan dilaksanakan di Laboratorium Kultur Jaringan Fakultas Pertanian Universitas Winaya Mukti Sumedang. Eksperimen menggunakan Rancangan Acak Lengkap (RAL) Pola Faktorial, yang terdiri atas dua faktor dan diulang sebanyak dua kali.Faktor pertama adalah jenis anggrek Phalaenopsis hasil persilangan yang terdiri atas tiga jenis, yaitu v1 (Phalaenopsis 717 X Phalaenopsis Fire Bird), v2 (Phalaenopsis Tianong Rose X Sibling), dan v3 (Phalaenopsis Luchia Pink X Phalaenopsis Chain Xen Mammon). Faktor kedua adalah EMS yang terdiri atas enam taraf perlakuan, yaitu e0 (0% EMS/kontrol), e1 (0,05% EMS), e2 (0,10% EMS), e3 (0,15% EMS), e4 (0,20% EMS), dan e5 (0,25% EMS). Eksplan berupa protocorm dari tiga jenis anggrek Phalaenopsis hasil persilangan yang direndam dalam larutan EMS berdasarkan masing-masing perlakuan selama 3 jam, dan dikulturkan pada media MS Modified Multiplication Shoot Basal selama 10 minggu.Hasil penelitian menunjukkan terjadi interaksi antara tiga jenis anggrek Phalaenopsis hasil persilangan dengan konsentrasi EMS terhadap variabel jumlah akar.Anggrek P. 717 X P.Fire Bird memiliki jumlah daun, jumlah akar, jumlah tunas, panjang daun dan panjang akar yang lebih baik dibandingkan jenis lainnya. Konsentrasi EMS secara mandiri pada semua taraf perlakuan tidak dapat meningkatkan jumlah daun, jumlah akar, bobot segar planlet, panjang daun, dan panjang akar.Kata Kunci: Phalaenopsis, Konsentrasi EMS, dan Budidaya In Vitro
Pengaruh Konsentrasi Rizobakteri Pemacu Tumbuh Tanaman Dan Dosis Pupuk NPK Terhadap Pertumbuhan Dan Hasil Kedelai (Glycine Max L. Merrill) Varietas Dering 2 Danger, Crobertha Oba Doa Rathu; Komariah, Ai; Romiyadi, Romiyadi
OrchidAgro Vol. 4 No. 1 (2024)
Publisher : Fakultas Pertanian Universitas Winaya Mukti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35138/orchidagro.v4i1.642

Abstract

Penelitian ini bertujuan untuk mengetahui dan mempelajari interaksi RPTT dan pupuk NPK serta mencari konsentrasi dan dosis perlakuan yang memberikan pengaruh yang terbaik terhadap pertumbuhan dan hasil tanaman kedelai varietas Dering 2. Percobaan dilaksanakan di kebun percobaan Fakultas Pertanian UNWIM pada bulan Februari hingga Juni 2023, ketinggian tempat 875 mdpl dan jenis tanah Andisol.  Percobaan ini menggunakan Rancangan Acak Kelompok (RAK) pola faktorial yang terdiri dari 2 faktor. Faktor pertama yaitu konsentrasi RPTT yang terdiri dari 4 taraf, yaitu: p0 = 0 ml L-1, p1 = 5 ml L-1, p2 = 10 ml L-1 dan  p3 = 15 ml L-1. Faktor kedua yaitu dosis NPK yang terdiri dari 4 taraf, yaitu n0= 0 kg ha-1, n1= 5 kg ha-1, n2= 10 kg ha-1 dan n3= 15 kg ha-1. Hasil penelitian menunjukkan tidak terjadi interaksi antara konsentrasi RPTT dan dosis pupuk NPK, secara mandiri konsentrasi RPTT 15 ml L-1 berpengaruh nyata terhadap bobot 100 biji, sedangkan dosis pupuk NPK 150 kg ha-1 berpengaruh terhadap jumlah daun umur 35 HST dan dosis 450 kg ha-1 berpengaruh nyata terhadap bobot 100 biji.Kata kunci : Kedelai, Konsentrasi Rizobakteria Pemacu Tumbuh Tanaman, Dosis Pupuk NPK
Tinjauan Pengembangan Pemukiman dan Tantangan untuk Kota yang Berkelanjutan Romiyadi, Romiyadi; Fatmayati, Fatmayati
Jurnal Sains dan Ilmu Terapan Vol. 8 No. 1 (2025): Jurnal Sains dan Ilmu Terapan
Publisher : Politeknik Kampar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59061/jsit.v8i1.1017

Abstract

Rapid urbanization in Indonesia presents various environmental and social challenges, including increased disaster risk, urban heat island effects, and social disparities in urban settlements. This study examines the role of green infrastructure, sustainable spatial planning, and risk mitigation policies in addressing the adverse impacts of urban growth. Utilizing a literature review and spatial data analysis, findings indicate that implementing sustainable development strategies and integrating disaster risk data into urban planning can enhance urban resilience and improve the quality of life for city residents. The study emphasizes the importance of collaboration among government, communities, and stakeholders to achieve inclusive, environmentally friendly, and climate-adaptive urban development.
Perawatan Mesin untuk Meningkatkan Performa dan Keandalan Mesin dan Peralatan Romiyadi, Romiyadi
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 8 No. 3 (2025): July
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v8i3.47078

Abstract

Machine maintenance is a critical component in the industrial and manufacturing sectors to ensure that equipment operates efficiently and has a prolonged lifespan. This study aims to explore the various types of machine maintenance implemented across different industrial sectors, along with the benefits and challenges associated with their application. Utilizing a literature review approach, the study identifies four main types of maintenance: preventive, corrective, predictive, and redesign. Each maintenance type plays a crucial role in enhancing machine performance, reducing downtime, and extending the service life of industrial equipment. Effective maintenance practices offer several advantages, including improved operational performance, reduced repair costs, and enhanced workplace safety. However, the implementation of maintenance strategies presents several challenges, such as high costs, limited availability of skilled labor, and the time required for maintenance procedures. Despite these obstacles, with the adoption of appropriate strategies, such challenges can be effectively managed, enabling companies to achieve greater operational efficiency and long-term sustainability.
Implementation of Preventive Maintenance for CNC Machines in Vocational Education Facilities: A Case Study at Politeknik Kampar Romiyadi, Romiyadi; Febrianton, Adi
G-Tech: Jurnal Teknologi Terapan Vol 9 No 4 (2025): G-Tech, Vol. 9 No. 4 October 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i4.7951

Abstract

This research aims to optimize the preventive maintenance system for CNC machines in the context of vocational education, with a focus on improving practice efficiency and reducing downtime. The study was conducted at Politeknik Kampar using a quantitative-descriptive approach integrated with a case study method. Quantitative data were obtained from machine performance logs, including total operating hours, number of breakdowns, and maintenance time before and after preventive maintenance implementation. Descriptive data were gathered through structured interviews and direct observation of CNC training sessions. The research focused on two types of machines, namely the CNC Milling HURCO VM 10 and the CNC Turning Center SKT 160A, which are intensively used in practical training activities. Prior to the implementation of the preventive maintenance protocol, the existing maintenance system was reactive and unscheduled, leading to frequent breakdowns and extended operational downtime. Following the implementation of the preventive maintenance program over a six week period, the frequency of machine breakdowns decreased by approximately 45%, and average downtime was reduced from 6.2 hours to 3.4 hours per week. Consequently, practice efficiency increased by about 28%, as reflected in the higher completion rate of student machining tasks within the allocated schedule. Student involvement in daily maintenance also contributed to building practical awareness of the importance of maintenance in industrial settings. The findings demonstrate that preventive maintenance not only enhances machine reliability but also strengthens vocational learning processes based on hands-on skills.
Optimizing Biobriquette Quality : The Role of Raw Material Selection in Tapioka Based Binder System Fatmayati, Fatmayati; Dhora, Anna; Romiyadi, Romiyadi
G-Tech: Jurnal Teknologi Terapan Vol 9 No 4 (2025): G-Tech, Vol. 9 No. 4 October 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i4.7960

Abstract

The continuous increase in energy consumption, along with the gradual depletion of fossil fuel reserves, highlights the need for sustainable alternative energy sources. Oil palm biomass waste is a promising raw material due to its abundance and high calorific value. This study aims to investigate the production process of biobriquettes made from four types of oil palm waste leaves, fronds, trunks, and shells using natural tapioca starch as a binder. The experimental procedure consisted of several stages: raw material preparation (cleaning, cutting into 1–3 cm pieces, and sun-drying), carbonization by incomplete combustion (pyrolysis) for approximately three hours, grinding and sieving through a 60-mesh screen, mixing the charcoal with 17% tapioca binder solution (starch-to-water ratio of 1:7), manual pressing, and oven drying at 105°C for ten hours. The resulting biobriquettes were evaluated based on SNI 01-6235-2000 standards, including moisture content, ash content, volatile matter, fixed carbon, and burning rate. The trunk-based biobriquette exhibited the best performance, with 5.10% moisture, 5.95% ash, 12.95% volatile matter, 76.00% fixed carbon, and a burning rate of 0.1256 g/min. Most parameters met the SNI requirements, except for slightly lower fixed carbon content. Therefore, oil palm trunk biomass is recommended as the most suitable raw material for producing high-quality, eco-friendly biobriquettes.
Impact of spindle tilt and machining parameters on surface roughness in milling Romiyadi, Romiyadi; Febrianton, Adi
Jurnal Polimesin Vol 23, No 5 (2025): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i5.7258

Abstract

This study aims to analyze the influence of spindle tilt and machining parameters (feed rate, depth of cut, and spindle speed) on surface roughness in milling operations using a Knuth UFM 2 universal milling machine. A parametric experimental approach was used, where parameters were varied systematically to assess their influence on surface quality. Results show that increasing spindle tilt, feed rate, and depth of cut generally raises surface roughness, while higher spindle speeds reduce it, producing smoother surfaces. The optimal surface quality was achieved during the first up-milling test with a spindle inclination of 30°, feed rate of 108 m/min, spindle speed of 720 rpm, and depth of cut of 0.50 mm, yielding a surface roughness (Ra) of 0.258 µm. In contrast, higher tilt angles and cutting loads significantly degraded surface finish, with roughness increasing by up to 95.91% when spindle tilt was raised from 30° to 60°, by 52.86% when depth of cut increased from 0.50 mm to 1.50 mm, and by 79.25% when feed rate rose from 45 m/min to 233 m/min. Conversely, increasing spindle speed from 148 rpm to 720 rpm reduced Ra by 99.81%. These findings highlight the importance of selecting appropriate parameter combinations to achieve precision, efficiency, and sustainability in milling. The results also provide practical reference for industrial applications and vocational training in manufacturing engineering.
Pengaruh Kedalaman Potong Menggunakan Insert Radius 0,4 mm cnmg 120404n Terhadap Kekasaran Permukaan (Surface Roughness) Baja Karbon S45C Febrianton, Adi; Putri, Indah Purnama; Romiyadi, Romiyadi; Irwan, Purnama; Sihotang, Psalmen
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 7 No. 3 (2024): July
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v7i3.28567

Abstract

In the practical and sophisticated world of the manufacturing industry, the best product results are needed. To answer market needs that want products with maximum results and produce them in a short time, the non-conventional Computer Numerical Controlled Lathe (CNC) is available as a machine tool production tool that is controlled using a computer system to cut workpieces which are rotated to determine the roughness value on the workpiece surface. The aim of this research is to obtain the lowest surface roughness results. Using S45C carbon steel material with Sumitomo CNMG 120404-N-Gu-AC8025 brand insert with a Radius of 0.4 mm on the SKT 160A CNC Turning machine. The next process is the process of turning the workpiece with variations in cutting depth of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm , 0.9mm, 1.0mm, 1.1mm. Using the G96 program code, the feed movement is 0.15 mm/rev with a constant spindle speed of 2700 rpm and using a Stylus as a measure of surface roughness value. By carrying out 1 test on 11 samples, each sample consisting of 3 test points. Based on the results of surface roughness data, the lowest average Ra roughness results for an insert radius of 0.4 mm were 1,115 µm at a cutting depth of 0.6 mm and was included in the roughness tolerance value N6.
Analisis kekuatan tarik pada proses pengelasan SMAW baja selindris AISI 1045 dengan variasi merek elektroda Febrianton, Adi; Putri, Indah Purnama; Irwan, Purnama; Romiyadi, Romiyadi; Dwianda, Yudi
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 7 No. 4 (2024): October
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v7i4.36080

Abstract

Pembuatan papan blockboard menggunakan limbah batang kelapa sawit sebagai upaya pelestarian lingkungan Romiyadi, Romiyadi; Frinaldi, Aldri; Lanin, Dasman; Rembrandt, Rembrandt
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 7 No. 4 (2024): October
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v7i4.36802

Abstract

This study was conducted to make blockboard using oil palm trunk waste as raw material. The purpose of this study was to determine the physical and mechanical properties of blockboard made from oil palm trunk raw materials and compared with the physical and mechanical properties of blockboard available on the market. The mechanical properties tested were tensile strength, flexural strength and air absorption. The oil palm trunk used was waste from rejuvenation that was 25-30 years old. The results showed that blockboard made from oil palm trunk waste had higher tensile strength and flexural strength values ??than market blockboard. Meanwhile, the water absorption capacity of market blockboard is better than the water absorption capacity of blockboard made from oil palm trunk waste. This study was conducted to implement one of the government policies in the context of utilizing oil palm waste, especially oil palm trunk waste as an effort to preserve the environment.
Co-Authors Adi Febrianton Ai Komariah -, Ai Komariah Aldri Frinaldi Danger, Crobertha Oba Doa Rathu Dasman Lanin Dhora, Anna Dwianda, Yudi Febrianton, Adi Indah Purnama Putri Irwan, Purnama Mustika, Widya Sinta Purnama Irwan Putri, Indah Purnama Rembrandt, Rembrandt Sihotang, Psalmen Suseno Amien Yudi Dwianda