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Mei Sulistyoningsih
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JITEK (Jurnal Ilmiah Teknosains)
Published by Universitas PGRI Semarang
ISSN : 24609986     EISSN : 24769436     DOI : https://doi.org/10.26877/jitek
Core Subject : Health, Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Mechanical Engineering Veterinary
JITek: Jurnal Ilmiah Teknosains 2476-9436 (media online) & 2460-9986 (media cetak) published scientific papers on the results of applied and natural science research covering the fields of science including engineering (civil, chemistry, architecture, electrical, mechanical, enviromental), food technology, agriculture, physics, biology, mathematics, chemistry and technical information. The manuscript must be original research, written in Bahasa Indonesia or English, and not be simultaneously submitted to another journal or conference. Manuscripts will be reviewed by an expert editor and managing editor. The journal has been indexed in Google Scholar, Dimensions and Crossref.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 218 Documents
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STABILITAS WARNA DAN PERUBAHAN pH WEDANG UWUH SIAP MINUM SELAMA PENYIMPANAN Septiyani, Retnosyari; Rahayu, Wahidah Mahanani; Permadi, Adi
(JITEK)Jurnal Ilmiah Teknosains Vol 10, No 1/Mei (2024): Jitek
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jitek.v10i1/Mei.18790

Abstract

Wedang uwuh is a traditional drink from Yogyakarta with various product forms. Ready-to-drink wedang uwuh is a more practical and economical alternative for consumption, but with limited color stability around 1 day. This research aims to examine the color stability of ready-to-drink wedang uwuh at varying temperatures and brewing times, at room and cool temperature, and with sugar or Na-benzoate addition. The experiment was carried out in a Completely Randomized Design with a variety of brewing conditions of temperature (75°C, 85°C, and 95°C) and time (10, 15, and 20 minutes) at material and water ratio of 1:1 (wv), followed by filtration and storage. The filtrate was then observed for changes in color for 7 days. Brewing condition with best color stability at 85oC for 20 minutes were then treated with the addition of sugar or sodium benzoate and then tested for pH and color for 9 days storage in cool and room temperature. The research results showed that all samples (original, sugar added, and Na-benzoate added) had pH color change during storage, but original and Na-benzoate added had the best stability. Ready-to-drink wedang uwuh stored in cold temperature had better red color stability than room storage.
PEMBUATAN PAVING BLOCK DENGAN SERBUK BATU KARANG SEBAGAI SUBSTITUSI SEMEN MENGGUNAKAN METODE DRYMIX Rochmanto, Decky; Pratama, Andrie Mandala Yudha; Saputro, Yayan Adi; Qomaruddin, Mochammad; Roesdiana, Tira
(JITEK)Jurnal Ilmiah Teknosains Vol 9, No 2/Nov (2023): JiTek
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jitek.v9i2/Nov.16918

Abstract

Utilizing dead rock as a cement additive in the manufacture of paving blocks, and the rock contains CaCO3 which includes limestone as in the content of cement which has lime content (CaO), the aim is to determine the effect of rock on the compressive strength value of paving blocks. Utilization of stone in the manufacture of paving blocks using a mixture of design 0%, 5%, 10%, and 15% of the weight of cement to be used. Manufacture of paving blocks using a ratio of 1: 3 sand cement, cement water factor 0.4 with molds 20 x 10 x 6 cm, compaction weight of 1 paving 3.52 kg and testing compressive strength at 7, 14 and 28 days, using the method (SNI 03- 0691-1996) paving block. From the analysis of compressive strength testing, it was found that the compressive strength of paving blocks increased towards normal paving blocks to produce the highest compressive strength with added rock in the 15% variation at the age of 28 days, which amounted to 45.1 MPa and included the quality of class A paving blocks with SNI 03-0691 (1996) standards. The compressive strength of the 5% variation at 28 days of age is 38.7 MPa and the compressive strength of the 10% variation at 28 days of age is 43.5 MPa. It can be seen that coral stone as a cement additive is able to improve the quality of compressive strength of paving blocks.
ANALISIS PERANCANGAN METODE VLSM DAN FLSM PADA MANAJEMEN IP ADDRESS LAN Rahman, Nur; Santoso, Banu; Pambudi, Agung; K Rasyid, Rum Mohamad Andri; Mulyatun, Sri; Tegris, Efrat; Widya Sari, Marti
(JITEK)Jurnal Ilmiah Teknosains Vol 10, No 1/Mei (2024): Jitek
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jitek.v10i1/Mei.18988

Abstract

Computer networks are very important for people in the current era of modern globalization to access their daily needs. A good computer network is certainly needed to speed up community activities. Sub-netting is one of the things that can be done to optimize IP management on a computer network. This research on the application of the subnetting method on a computer network can be a reference in determining a better subnetting method for building a network. This research aims to analyze the influence of the two subnetting methods on a computer network, compare the network speeds obtained, and the application of the two subnetting methods on a computer network based on QoS parameters. The research results show that the analysis of both subnetting methods displays a very good QoS Index with the following details: FLSM: average throughput 50.792kbps, packet loss 0%, average delay 5.25ms, average jitter 5.37ms. VLSM: average throughput 77.843kbps, packet loss 0%, average delay 3.52ms, average jitter 3.58ms. In the FLSM method, all applied subnets have 101 remaining unused IPs and in VLSM, all applied subnets have 19 unused IPs remaining. This proves that networks designed using the VLSM subnetting method have more optimal network quality and more effective IP management.
PENGARUH PARKIR DI BADAN JALAN (ON STREET PARKING) PASAR TRADISIONAL TERHADAP KINERJA JALAN Ristiyanto, Hartono Guntur; Abadi, Anugerah Ageng
(JITEK)Jurnal Ilmiah Teknosains Vol 9, No 2/Nov (2023): JiTek
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jitek.v9i2/Nov.15688

Abstract

Keberadaan parkir di badan jalan berpotensi menurunkan kinerja jalan. Penurunan kinerja jalan tersebut perlu diantisipasi dengan berdasar informasi terkait kondisi parkir dan seberapa besar pengaruh parkir tersebut terhadap kinerja jalan. Oleh karena itu, pertanyaan penelitian ini adalah : bagaimana karakteristik parkir saat ini dan dampaknya terhadap kinerja jalan? Tujuan penelitian adalah menganalisis karakteristik dan pengaruh parkir terhadap kinerja jalan. Metode analisis kapasitas jalan menggunakan PKJI 2014. Keberadaan parkir di badan jalan oleh pengguna pasar tradisional berupa bentuk jumlah kendaraan parkir dan hambatan samping. Kedua jenis dampak tersebut baik terpisah maupun bersama-sama mempengaruhi kinerja jalan. Secara terpisah, kendaraan parkir berdampak terhadap : volume lalu lintas (Q), kapasitas (C), dan nilai bobot hambatan samping. Sedangkan secara bersama-sama, berpengaruh terhadap : derajat kejenuhan dan kecepatan (bebas maupun rata-rata). Hasil analisis menunjukkan, kinerja jalan yang paling terdampak adalah derajat kejenuhan. Parkir kendaraan di badan jalan mempunyai dampak terbesar terhadap derajat kejenuhan (DJ) pada hari Minggu, yaitu menaikkan nilai DJ sebesar 45%. Sementara dampak terkecil adalah terhadap kecepatan bebas jalan di hari Senin, yaitu menurunkan kecepatan sebesar 2%. Namun demikian, dampaknya terhadap kecepatan rata-rata jauh lebih besar daripada kecepatan bebas, yaitu menurunkan kecepatan sebesar 10%. Hal ini disebabkan karena nilai kecepatan rata-rata juga fungsi dari derajat kejenuhan
ANALISIS KEBUTUHAN PRIMARY AIR PADA KILN BURNER UNTUK MEMPRODUKSI KLINKER Panjaitan, Jabosar Ronggur Hamonangan; Tursida, Faiza; Rahmadini, Gustia; Putra, Rahman Etika
(JITEK)Jurnal Ilmiah Teknosains Vol 10, No 1/Mei (2024): Jitek
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jitek.v10i1/Mei.18265

Abstract

Clinker is the main ingredient in cement production which was produced by calcination process in a kiln with a burner. In this research, air requirements for the combustion process in burner to produce clinker were investigated. Based on the results, it was found that the air requirement for fuel combustion process was 127,403.849 (Nm3/hour). The combustion air requirement if 8% primary air used was 10,192.3 (Nm3/hour) and for 10% primary air used was 12,740.38 (Nm3/hour). The operational primary air flow (10.6%) was close to the theoretical primary air flow (10%), which operational primary air flow was 13,504.8 (Nm3/hour) and theoretical primary air flow (10%) was 12,740.38 (Nm3/hour).
ACTIVE INTERMEDIATE REACTION MECHANISM FOR NITROCELLULOSE PRODUCTION Panjaitan, Jabosar Ronggur Hamonangan
(JITEK)Jurnal Ilmiah Teknosains Vol 9, No 2/Nov (2023): JiTek
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jitek.v9i2/Nov.16838

Abstract

One of the most widely applied cellulose derivative products in industry is nitrocellulose which was produced through a nitration reaction between cellulose and nitric acid. In this research, the determination of the active intermediate reaction mechanism for nitrocellulose production was investigated. Four active intermediate mechanism models were used to predict the nitrocellulose formation reaction. Based on the results, it was found that models 3 and 4 which were active intermediate models that did not consider the effect of the sulfuric acid catalyst in the nitration reaction with irreversible nitration reaction. NO2+ ion was an active intermediate compound which had an important role in producing nitrocellulose. Sulfuric acid in the nitration reaction used to break down nitric acid into NO2+ ions without affecting the cellulose nitration process.
DAMPAK PANDEMI COVID-19 TERHADAP KARAKTERISTIK FUNGSI HAMBATAN PERJALANAN MENUJU KAWASAN PENDIDIKAN Guntur Ristiyanto, Hartono; Supranoto, Bambang
(JITEK)Jurnal Ilmiah Teknosains Vol 10, No 1/Mei (2024): Jitek
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jitek.v10i1/Mei.18917

Abstract

Analisis fungsi hambatan dibutuhkan untuk mengestimasi model distribusi perjalanan. Penentuan fungsi yang universal dibutuhkan untuk meningkatkan efisiensi pemodelan sehingga memungkinkan kita mengurangi ambiguitas matriks asal-tujuan. Bentuk fungsi yang mencerminkan kondisi eksisting (misal : adanya pengaruh pandemi) perlu dirumuskan dengan benar sehingga bisa digunakan untuk mengkalibrasi matriks asal-tujuan perjalanan dengan akurat sebagai dasar prediksi volume perjalanan. Berdasarkan hal tersebut, maka rumusan masalah penelitian ini adalah : bagaimana karakteristik fungsi hambatan perjalanan menuju kawasan pendidikan akibat adanya pandemi Covid-19 ? Tujuan utama penelitian untuk menemukan koefisien fungsi hambatan perjalanan yang sesuai akibat dari dampak pandemi. Analisis regresi fungsi hambatan dilakukan dengan bahasa pemrogaman Microsoft Excel dan SPSS for Windows. Variabel terikat adalah jumlah perjalanan. Sedangkan variabel bebas adalah jarak tempuh dari asal ke tujuan sekolah. Fungsi hambatan menggunakan bentuk fungsi : pangkat, eksponensial, dan kombinasi (Tanner). Hasil analisis menunjukkan bahwa pandemi mengakibatkan terjadinya perubahan pola sebaran panjang perjalanan. Nilai koefisien fungsi hambatan berubah secara signifikan akibat pengaruh pandemi. Tetapi, bentuk kurva sebaran panjang perjalanan cenderung mempunyai bentuk yang sama sebelum pandemi maupun saat pandemi. Sedangkan bentuk fungsi terbaik yang bisa menjelaskan pola sebaran perjalanan sebelum pandemi dan saat pandemi adalah jenis fungsi gabungan atau fungsi Tanner.
PENGEMBANGAN ALAT BANTU MESIN CUTTING BESI DENGAN SISTEM CONVEYOR SLIDING MENGGUNAKAN METODE RULA DAN REBA UNTUK MENGURANGI RISIKO GANGGUAN MUSKOLOSKELETAL Mirajhusnita, Isradias; Syaefulloh, Syaefulloh; Nurwildani, M. Fajar; Sugiono, Mohammad Cipto; Hariyanto, Hariyanto
(JITEK)Jurnal Ilmiah Teknosains Vol 9, No 2/Nov (2023): JiTek
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jitek.v9i2/Nov.17365

Abstract

This The purpose of this study, to identify complaints of Musculoskeletal Disorders (MSDs) experienced by workers at UD. Andika Aluminum and Welding, these complaints include pain in the upper arm, waist, right forearm, right wrist, and right and left knees. The results of the RULA and REBA scores obtained from the highest cutting activities before the use of work tools currently resulted in a high risk of 76 and 75 and decreased after the development of tools, namely to 40 and 39. Assessment of work posture for cutting with ergofellow software obtained RULA scores and the highest REBA is with a RULA score of 7 7 and a REBA of 12 11, which is included in the category "Immediate action is required" and after repairs are made to the highest score the work station cuts the RULA and REBA scores decreased with a RULA of 4 4 and REBA of 2 3 which are categorized in the "no action required" level of action.
ANALISA SPASIAL SEBARAN EROSI DI DAS AIR BETUNG DENGAN METODE USLE MENGGUNAKAN GIS (Geografis Information System) Azizah, Barrorotul; Aisah, Elpita; Ardiansyah, Didi
(JITEK)Jurnal Ilmiah Teknosains Vol 10, No 1/Mei (2024): Jitek
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jitek.v10i1/Mei.19404

Abstract

Along with rapid population growth, human needs for food also continue to increase. However, on the other hand, land as the main factor in agricultural production continues to decline both in quality and quantity. Decreased soil quality can occur due to erosion. Erosion is the process of loose soil grains from their parent in a place and the material is transported by water flow or wind. The process of erosion is determined by hydrological factors including rain intensity, topography, soil character, land cover vegetation, and land use. The Air Betung River Basin Sub-Regional Area, with high rainfall, has the potential for erosion which results in continuous scouring which can cause landslides and changes in land use. Based on this, an analysis of the distribution of erosion in the Air Betung River Sub-Watershed was carried out using the USLE method, then mapping was carried out using the Geographic Information System (GIS) system with Arch GIS. The aim of this research is to determine the distribution of erosion in the Air Betung Watershed, Pagar Alam City, then the results of this research are mapped using Arch GIS. The results of this mapping include land use maps, rainfall index maps, slope slope maps, Soil type index, soil erosivity index map. The map shows that the types of soil found in the Air Betung watershed consist of 3 types, namely, A leosol latosol cokku, A podmerkun podcokun, Yellowish Red Podsolk. The highest level of erosivity in the Air Betung watershed is 1207.5 tons/ha/year, and the lowest level is 0.155 tons/ha/year. The slope level ranges from 8 to 40%.
SISTEM INFORMASI PANGGIL KULI PROYEK (SIPAKUPROY) BERBASIS WEBSITE MENGGUNAKAN FRAMEWORK CODEIGNITER Bismi, Waeisul; Febriyani, Anisa; Ramadhan, Farid
(JITEK)Jurnal Ilmiah Teknosains Vol 9, No 2/Nov (2023): JiTek
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jitek.v9i2/Nov.16198

Abstract

The development of Website-based information systems has provided significant benefits in terms of distance, time, and accessibility, particularly in the construction industry for finding skilled and experienced construction workers. However, challenges arise in finding qualified workforce due to the phenomenon of globalization. To overcome this issue, SIPAKUPROY is designed as an information system that supports these needs. Through SIPAKUPROY, users can access multiple construction worker teams, obtain detailed pricing information, and follow an efficient payment process. The transition process from manual to digital sales systems, known as digitalization, is a crucial key in implementing SIPAKUPROY, which requires suitable and reliable software and hardware. In the design of SIPAKUPROY, user-friendly design is the main focus, aiming to provide an easy and comfortable user experience. Overall, SIPAKUPROY offers a solution for individuals seeking reliable construction workers without personal connections in the industry. Thus, SIPAKUPROY makes a positive contribution in addressing the challenges faced in finding trustworthy construction workers in this era of globalization.

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