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All Journal Sinkron : Jurnal dan Penelitian Teknik Informatika Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi NUCLEUS: Jurnal Sains dan Teknologi Prima Abdika: Jurnal Pengabdian Masyarakat Griya Journal of Mathematics Education and Application CHEDS: Journal of Chemistry, Education, and Science Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer (JURITEK) Jurnal Sains dan Teknologi
Nelza, Novia
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Penentuan Kebutuhan Poli Aluminium Klorida pada Proses Penjernihan Air di Unit Water Treatment PT. XYZ Kuala Tanjung Nelza, Novia; Sebayang, Mariani; Yunianto; Simatupang, Dimas Frananta
INSOLOGI: Jurnal Sains dan Teknologi Vol. 2 No. 6 (2023): Desember 2023
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v2i6.2783

Abstract

A Water Treatment Unit (WTU) is a station that works on the processing and conditioning of raw water to meet the desired water quality. Water purification at PT. XYZ Kuala Tanjung uses raw water sourced from surface water or rivers. The river water used still contains solid substances and organic matter that render the water unsuitable for industrial use. Both suspended and colloidal solid substances can cause turbidity. Turbidity caused by solid substances can be addressed using coagulation techniques. The purpose of this research is to determine the optimal concentration and dosage of coagulant to clarify water in the WTU. The coagulant used is polyaluminum chloride (PAC). The research method is based on experiments using jar tests and stoichiometric calculations. The determination of the optimal coagulant is measured based on turbidity parameters. Experiments are conducted with varying concentrations of PAC ranging from 25-65 ppm, and the smallest turbidity value obtained is 1.21 NTU at a PAC concentration of 65 ppm, with a PAC requirement of 202.6679 kg/day. The higher the PAC concentration, the clearer the resulting water, but the daily requirement for PAC also increases.
Comparison of Activation Functions on Convolutional Neural Networks (CNN) to Identify Mung Bean Quality Karo Karo, Ichwanul Muslim; Karo Karo, Justaman Arifin; Ginting, Manan; Yunianto, Yunianto; Hariyanto, Hariyanto; Nelza, Novia; Maulidna, Maulidna
Sinkron : jurnal dan penelitian teknik informatika Vol. 7 No. 4 (2023): Article Research Volume 7 Issue 4, October 2023
Publisher : Politeknik Ganesha Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33395/sinkron.v8i4.13107

Abstract

Mung bean production levels by farmers in Indonesia are not stable. When there is a surplus, the stock of mung beans in the warehouse will accumulate, the storage factor affects the quality of mung beans. Indicators of quality mung beans can be seen from the color and size through direct observation. However, the aspect of view and assessment and the level of health of each observer is a human error in the classification of mung bean quality so that the results are less than optimal. One alternative way to identify object quality is to use deep learning algorithms. One of the popular deep learning algorithms is convolution neural network (CNN). This study aims to build a model to classify the feasibility of mung beans. The process of building the model also goes through the image preprocessing stage. In the process of building the model, there are ten setup parameters and four setup data used to produce the best model. As a result, the best CNN algorithm model performance is obtained from data setup I, with accuracy, precision, recall and F1 score above 75%. In addition, this study also analyzes Rel U and Adam activation functions on CNN algorithm on model performance in identifying mung bean quality. CNN algorithm with Adam activation function has 92% accuracy, 92.53% precision, 91.9% recall, and 92.19% F1 score. In addition, the performance of CNN algorithm with Adam activation function is superior compared to CNN algorithm with Adam activation function and previous study
Pembuatan Balsem Aromaterapi dari Minyak Atsiri Sereh Wangi (Cymbopogonnardus L. Rendle) Sylvi, Sylvi; Nelza, Novia; Purba, Switamy Angnitha
NUCLEUS Vol 4 No 2 (2023): NUCLEUS
Publisher : Neolectura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37010/nuc.v4i2.1368

Abstract

Essential oils are volatile oils or oil fly that is generally tangible fluid obtained from the plant roots, bark, stems, and leaves by steam distillation of water. Plants containing essential oils and has the potential to be developed is a plant citronella (Cymbopogon nardus L. Rendle). The purpose of this study to make products balm aromatherapy essential oils of citronella and test the quality of quality of the aromatherapy balm with water vapor distillation method. The collection of data obtained from the analysis is the analysis parameter identification of compounds, numbers ester, test Total Plate Count, testing Pb method of AAS, the, determination of the refractive index, the determination viksositas, determination of pH balm, and a test of endurance balm, saponification, test molds, metal test Cu and specific gramavity test, and analysis of quality parameters of essential oil (yield and organoleptic tests). Results of analysis of parameter numbers ester (17.6177; 17.7824; 18.5295), test Total Plate Count (0; 3 × 102 and 3 × 102), Pb metal test methods AAS (0.02895; 0.0145; 0.01445), the identification of compounds (+), 1.4675 refractive index, viksositas 439,89cp, 436,01cp, 419,57cp, pH 6 balm, balm endurance test, saponification 11:04; 16.66; 16.76, mold testing namely (-), Cu metal test 0.1743; 0.5242; 0.0222, testing the specific gramavity is 0898; 0.922; 0901. The result of the isolation of essential oils of citronella 27,000 gramam sample was obtained ± 62 mL with the results of citronella essential oil yield of 0.23% v / b; the identification of essential oils generally exhibit containing citronella essential oil.
Analisa Pengaruh Temperatur Terhadap Laju Pengeringan Crumb Rubber Pada Dryer Menggunakan Energi Panas Pembakaran Pada Burner Simanjuntak, Agus Wiranto; Darmadi, Herry; Rahmansyah, Abdul Azis; Nelza, Novia; Bukhari, Bukhari
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 9, No 1 (2023): April
Publisher : universitas teuku umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jmkn.v9i1.7572

Abstract

Crumb rubber is a semi-finished natural rubber product that still contains moisture content. One of the most needed crumb rubber standards is SIR 20 (crumb rubber) with a maximum moisture content of 0.80% according to Indonesia National Standard. To remove the water content, it is necessary to carry out the drying process. Drying is a process to evaporate water in a material by using heat. The drying process is carried out in the dryer unit. Hot air is obtained from burning a burner with a temperature of 130°C. The burner will heat the air and then distribute the hot air to the dryer unit with a dryer temperature of 116°C. In the dryer unit, crumb rubber will be dried with a drying process time of 172.62 minutes. The total heat required to dry the crumb rubber with an incoming feed weight of 626.66 kg, and the moisture content of the crumb rubber after drying is an average of 0.53%, this result still meets the standards of crumb rubber. ) SIR 20 of a maximum of 0.80%.
BESARNYA PERTAMBAHAN PANJANG RANTAI BUCKET CONVEYOR TIPE IBS AKIBAT BEBAN ANGKAT 4 TON DAN BEBAN MAKSIMUM Darmadi, Herry; Jajuliansyah, Jajuliansyah; Nelza, Novia; Rachmiadji, Irwan; Karo Karo, Justaman Arifin
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 9, No 2 (2023): Oktober
Publisher : universitas teuku umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jmkn.v9i2.8622

Abstract

Chain is a series of links or rings that are connected or attached to one another so that they form an elongated shape. Chains are used to move loads or continue rotation. One of the chains that is often used is steel. One of them is a roller chain installed in a bucket conveyor, where this conveyor functions to convey crumb rubber from one process to the next. In this research the author carried out two tests on the chain to obtain an increase in the length of the chain. In the first test the chain plate was carried out in a tensile test with a load of 4 tons and the second test was carried out with a maximum load until the chain broke. After the author carried out the first test, the amount of increase in chain length (ɛ) after being averaged was 0.54%. In the second test, the maximum load (Fmax) after being averaged was 7.298 tons, and the increase in chain length (ɛ) was 7.2%.
ANALISA LAJU KOROSI KETEBALAN PIPA BAJA KARBON PADA PROSES PEMBAKARAN DI UNIT BOILER Darmadi, Herry; Nelza, Novia; Muhammad Iqbal Harapan Muslim Siregar; Kurnia, Dian; Yudhi Bastanta
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 3 No. 1 (2023): Maret: Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Publisher : Pusat Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v3i1.920

Abstract

The demand for electrical energy continues to increase along with the increase in economic growth in Indonesia, where currently almost all equipment used by humans depends on electrical energy. The steam power generation system is one of the power generation systems that are commonly used in industries and other power plants. In general, a steam power generation system consists of several main components, namely: pumps, steam turbines, boilers, generators and condensers. Boilers are composed of several components such as pipes, chimneys, superheaters, steam drums, economizers, and other important components. One of the most important components in the boiler system is the boiler pipe which plays a role in helping the combustion process to be used in the boiler. Loss of boiler pipe thickness due to corrosion is one of the important factors that really need to be considered in the boiler combustion process at PLTU. Loss of thickness of the boiler pipe in the combustion process that is too large can cause pipe leakage which results in the interruption of the combustion process in the boiler pipe. So to overcome this problem, checks are carried out to carry out maintenance on the boiler pipe to avoid leaks in the boiler pipe. After the calculation, the average reduction in pipe thickness due to corrosion is 0.1465 mm/yr
ANALISIS KADAR NaCl PADA PROSES REGENERASI RESIN DALAM PENURUNAN KESADAHAN Ca2+ DAN Mg2+ PADA PROSES WATER TREATMENT DI PT. ANY Nelza, Novia; Maulidna, Maulidna; Rachmiadji, Irwan; Barus, Adil; Donda, Donda; Darmadi, Herry
CHEDS: Journal of Chemistry, Education, and Science Vol 8, No 2 (2024)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v8i2.10127

Abstract

Resin merupakan bahan yang mengandung ion-ion yang dapat ditukar dengan ion-ion yang ada di dalam air. Resin sebagai media penukar ion memiliki kemampuan terbatas dalam menukar ion hingga resin jenuh. Resin yang telah mengalami kejenuhan akan diregenerasi menggunakan larutan NaCl sehingga kemampuan resin dalam menukar ion kembali efisien. Dari perhitungan yang telah dilakukan diketahui bahwa jumlah NaCl yang digunakan untuk proses regenerasi dapat ditentukan dengan menghitung jumlah zat reaktif yang ditukar resin dengan kesadahan yang terkandung dalam air. Cara penentuan tingkat kesadahan dalam air menggunakan metode titrasi kompleksometri. Dari hasil penelitian yang telah dilakukan diketahui besarnya kekerasan yang terserap sebesar 18,9387 mg/L untuk logam Ca2+ dan 9,324 mg/L untuk logam Mg2+, jumlah zat reaktif Na+ yang ditukar sebesar 14,4763 mg/L untuk Ca2+ dan 7,0462 mg/L. mg/L untuk logam Mg2+ dan jumlah NaCl yang dibutuhkan sebesar 21,1504 mg/L untuk regenerasi resin.
BESARNYA GAYA YANG DIBUTUHKAN PISAU UNTUK MEMOTONG KARET PADA MESIN SHREDDER DI PT. XYZ Sidabutar, Naqasya Asyrori; Darmadi, Herry; Simbolon, Bonar Wahyudi; Nelza, Novia; Simalango, Jeffri
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 11, No 1 (2025): April
Publisher : universitas teuku umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jmkn.v11i1.12328

Abstract

Shredder machines are classified as cutting machines that use two types of rolls, namely feed rolls and shredder rolls. First the sheet will be inserted, then the feed roll will wrap around the rubber sheet which is pulled into the machine at the same time as the feed roll which wraps around the rubber sheet. Then the thread on the main roll plays the role of pulling the rubber sheet and also the solid corner of the main roll thread also acts as a knife which will press the rubber sheet together with the Death Knife which will clamp the rubber sheet until the rubber sheet is broken or cut. The events that occur in the process of cutting rubber sheets on the shredder machine are the occurrence of cutting forces between the interaction of angles on the main roll thread and also the death knife. This research uses observation and interview methods to collect this data. From the research results, it was concluded that the amount of cutting force required by the cutting knife to cut rubber into small pieces was 247,242 N. Meanwhile, the amount of power used to produce the cutting force to cut rubber sheets was 2,651 HP.
Analisis Tantangan, Peluang serta Implikasi Perbankan Digital terhadap Program Penjaminan Simpanan oleh LPS Purba, Switamy Angnitha; Tampubolon, Ferdinan; Angela Sitinjak, Anna; Nelza, Novia; Christine S. Purba, Darry
Griya Journal of Mathematics Education and Application Vol. 5 No. 3 (2025): September 2025
Publisher : Pendidikan Matematika FKIP Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/griya.v5i3.789

Abstract

Dewasa ini, teknologi informasi berkembang sangat cepat diberbagai bidang layanan salah satunya pada industri perbankan. Saat ini banyak bermunculan perbankan digital yang menawarkan berbagai fitur menarik dan kemudahannya. Namun tak dapat dipungkiri tingkat kepercayaan masyarakat masih terhitung besar pada perbankan konvensional dibandingkan perbankan digital. Lembaga Penjamin Simpanan (LPS) merupakan lembaga negara dengan status berbadan hukum yang independen, transparan dan akuntabel yang berfungsi menjamin simpanan nasabah penyimpan serta turut berperan aktif dalam memelihara stabilitas sistem perbankan sesuai dengan kewenangannya. Dengan adanya LPS diharapkan dapat memulihkan kepercayaan masyarakat terhadap sektor keuangan dan tidak khawatir untuk menyimpan uangnya di perbankan. Fokus penelitian ini adalah untuk mengetahui tantangan dan peluang perbankan digital serta implikasinya terhadap program penjaminan simpanan oleh LPS.
Sosialisasi Dasar Keselamatan dan Kesehatan Kerja Pengelasan untuk Pegawai PMT PTPN IV Dolok Ilir Sitepu, Evi Christiani; Purba, Switamy Angnitha; Sitinjak, Anna Angela; Lumbantoruan, Sorta; Kurnia, Dian; Saragih, Koko Pratama; Tarigan, Nurlianna; Manik, Toba Sastrawan; Maulidna, Maulidna; Nelza, Novia; Samiriadi, Samiriadi; Tambunan, Diman Raymond S
Prima Abdika: Jurnal Pengabdian Masyarakat Vol. 3 No. 3 (2023): Volume 3 Nomor 3 Tahun 2023
Publisher : Program Studi Pendidikan Guru Sekolah Dasar Universitas Flores Ende

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37478/abdika.v3i3.3052

Abstract

The application of Occupational Safety and health (K3) is very important in the work environment because it is closely related to the risk of accidents, safety and health when carrying out work. Various efforts have been made by the Tenera machinery factory (PMT) PTPN IV to minimize work accidents and diseases caused by work by installing warning signs, the use of complete personal protective equipment (PPE), providing good nutrition and regular health checks. However, the lack of awareness of K3 is still found in PMT PTPN IV Dolok Ilir workers. This can be seen from the still finding of minor work accidents and occupational health effects shown from the results of employee health reports. The methods used in this service activity are socialization, training, discussion on the basics of K3 welding for employees of PMT PTPN IV, so that factory employees are able to identify potential hazards that can occur in the workplace and accident prevention measures. The results of the socialization and training of welding K3 activities that have been carried out are expected to increase employee awareness of the importance of K3. So that the company is able to maintain the zero accident predicate.
Co-Authors Angela Sitinjak, Anna Barus, Adil Bukhari Bukhari Christine S. Purba, Darry Darmadi, Herry Dimas Frananta Simatupang Donda, Donda Ginting, Manan HARIYANTO HARIYANTO Ichwanul Muslim Karo Karo Jajuliansyah, Jajuliansyah Karo karo, Justaman Arifin Kurnia, Dian Lumbantoruan, Sorta Manik, Toba Sastrawan Maulidna, Maulidna Muhammad Iqbal Harapan Muslim Siregar Purba, Switamy Angnitha Rachmiadji, Irwan Rahmansyah, Abdul Azis Samiriadi, Samiriadi Saragih, Koko Pratama Sebayang, Mariani Sidabutar, Naqasya Asyrori Simalango, Jeffri Simanjuntak, Agus Wiranto Simbolon, Bonar Wahyudi Sitepu, Evi Christiani Sylvi, Sylvi Tambunan, Diman Raymond S Tampubolon, Ferdinan Tarigan, Nurlianna Yudhi Bastanta Yunianto Yunianto Yunianto