Portal Jurnal Politeknik Negeri Semarang
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Rancang Bangun Alat Pengukur Jarak Berbasis Arduino Uno dengan Sensor Ultrasonik
Get PDFInstrument equipment is part of the equipment installed on the tool intended to find out and get the desired data from an activity. One of the important instrument equipment in various fields is the measuring instrument. A jaral measuring instrument is basically a tool to find out how much distance or how long the distance is from an object. The need for measuring instruments used and having high accuracy encourages the creation of more measuring instruments. The purpose of this study is the development of a prototype distance measuring instrument based on Arduino uno microcontroller using ultrasonic sensor HC-SR04. This ultrasonic sensor uses the speed of sound to measure the distance with a magnitude of 340 m/s, thus knowing the time between sending the signal and receiving the signal so that the distance between the transmitter and the receiving object can be calculated. The distance measurement data will then be displayed on a 16 x 2 liquid crystal display for easy reading. This design is controlled through the Arduino Uno R3 kit based on ATMEGA 328 P which is implemented in an acrylic plastic plate as a place for the circuit. The test results from the distance measurement instrument research have a measurement error value range of 0% - 0.067%, so it can be said that the distance measuring instrument from this study has a high accuracy value
Evaluasi Pemilihan Refrigeran Ramah Lingkungan Untuk Sistem Pemanfaatan Panas Buang Mesin Diesel
Get PDFPenelitian ini mengevaluasi pemilihan refrigeran untuk sistem pemanfaatan panas buang mesin diesel dengan siklus Organic Rankine Cycle (ORC). Pemilihan refrigeran yang tepat merupakan faktor kunci dalam meningkatkan efisiensi sistem ORC, mengurangi dampak lingkungan, dan memastikan keselamatan operasi. Dalam penelitian ini, beberapa refrigeran dievaluasi berdasarkan sifat termofisika dan aspek keselamatan untuk menganalisis Total Equivalent Warming Impact (TEWI) dan performa sistem dari masing-masing refrigeran. Performa sistem ORC dievaluasi melalui pemodelan termodinamika secara matematis menggunakan MATLAB. Hasil simulasi menunjukkan bahwa keempat refrigeran memiliki efisiensi termal yang cukup tinggi, namun dengan nilai TEWI yang bervariasi. R600a memiliki nilai total TEWI terendah, yaitu 264.59 kgCO2eq/tahun, sedangkan R134a memiliki nilai total TEWI tertinggi, yaitu 4436.96 kgCO2eq/tahun. Berdasarkan hasil evaluasi, R600a merupakan refrigeran terbaik untuk digunakan dalam sistem pemanfaatan panas buang mesin diesel dengan siklus ORC, dengan mempertimbangkan efisiensi termal, aspek keselamatan, dan dampak lingkungan
ANALISIS PETA SEBARAN KUALITAS AIR DI KECAMATAN PONTIANAK BARAT KOTA PONTIANAK PROVINSI KALIMANTAN BARAT
Get PDFThe city of Pontianak has the longest river in West Kalimantan, namely the Kapuas River. This river is used by the majority of Pontianak City residents in their daily activities, including the West Pontianak District area. As a result, river water quality can change over time. Many influencing factors, such as human activities, are thought to cause the lake's water quality to become low. One way to control pollution in an ecosystem can be done by monitoring water quality over a certain period of time, so that the water quality status is known. Based on the description above, it is currently important to carry out an article regarding analysis of water quality distribution maps and water quality status in the West Pontianak District area. This article aims to analyze the level of pollution and how widespread the water pollution is in the West Pontianak District, Pontianak City by carrying out mapping based on water quality data using a Geographic Information System (GIS). The results of this research are that on the 2019, 2020 and 2021 distribution maps, analysis was carried out for 7 parameters, namely BOD, COD, Nitrate, PH, Temperature, TDS and TSS values. These 7 parameters show mutually supporting results that based on the distribution map, it can be seen that the water quality in the West Pontianak District area still seems safe for people to use for their daily activities. Even the Nitrate, PH, Temperature, TDS and TSS values appear to have increased from 2019 to 2021. This shows better water quality than the previous year. In 2020 and 2021 there are 2 additional parameters, namely DO and Phosphate and in 2021 there is a fecal coliform parameter. These three additional parameters also support the results of the previous 7 parameters. It can be seen that good changes have occurred in the water quality in the West Pontianak District area. The DO and phosphate distribution map show changes in values from 2020 and 2021, which shows that the water quality in the area is getting better. The fecal coliform distribution map shows that only a few points are contaminated with the feces of living creatures
HUBUNGAN ARUS, KECEPATAN DAN KEPADATAN LALU LINTAS PADA RUAS JALAN MAJAPAHIT KOTA MATARAM
Get PDFMajapahit Road is one of the provincial roads which is included in the collector road class with 4/2 D lane type in Mataram City. This road is a road that connects activity centers which causes the traffic volume to increase, resulting in reduced road performance. In this research, the relationship between the three main components of traffic flow, namely volume (Q), speed (V) and density (D), is analyzed in three methods, namely the Greenshield, Greenberg and Underwood models. From the results of research and analysis of traffic flow data, the density during traffic jams (Dj) was obtained from each model, where the Greenshield Model got a value between 271,375 ”“ 604,118 pcu/km, the Greenberg Model got a value between 164,001 ”“ 3899,011 pcu/km, The Underwood model gets values between 224,210 ”“ 504,674 pcu/km. From the summary of the analysis results, the Greenshield Model gets a capacity value between 3054,215 ”“ 5844,222 pcu/hour, the Greenberg Model gets a capacity value between 436,546 ”“ 7867,297 pcu/hour and the Underwood Model gets a capacity value between 3778,396 ”“ 7297 ,475 pcu/hour
ANALISIS DAMPAK KONSENSI TERHADAP KELAYAKAN PROYEK PERKERETAAPIAN
Get PDFConcession agreements have been implemented in many transportation infrastructure projects in Indonesia as a creative step by the government to meet the funding needs of transportation infrastructure projects in the country. The Jakarta-Bandung High-Speed Railway (JBHSR) is a major railway project with substantial investment. Despite securing a 50-year concession, the project has seen escalating investment costs. Nevertheless, the concession significantly impacts the feasibility of the project investment. This study examines and analyzes several factors that influence or are considered in the concession period agreement of railway projects. The research employs a qualitative descriptive method involving literature review, policy document analysis, and expert interviews. The research shows that high-speed railway projects typically have a lengthy return on investment. This is supported by the scarcity of countries globally where such projects have achieved both investment recovery and profitability. Regarding the 50-year concession for the JBHSR Project, it becomes inconsequential when construction issues arise, impacting costs and investment scale. Therefore, a review and reevaluation of the concession period is necessary. Furthermore, certain considerations need to be taken into account when determining the new concession period. The research aims to guide the government in enhancing concession policies, especially concerning railway project concession periods
Wellbeing and Tourism: A Bibliometric Analysis
Get PDFThe development of the tourism sector is closely related to the participation of the community around the tourist area. Then, the welfare of the surrounding community is a driving factor for the success of the tourism development. This study aims to investigate the breadth of research on public welfare and the tourism sector. This study uses a quantitative method based on bibliometric analysis using VOSViewer. Data obtained through the Scopus database with a total of 182 documents. The results showed that research with the keyword community wellbeing has a close relationship with tourism and tourism development. Meanwhile, in the context of community in tourism, namely health status, food security, social capital, life satisfaction, agriculture workers and environmental protection, it still needs to be studied more deeply. Even though tourism is the mainstay of Bali's development and economy, its development creates its own problems, especially for natural resources, the environment and creates anxiety for the community, especially related to income inequalit
Pomelo Orange Desease Detection Using CNN Based on Digital Image Processing
Get PDFPomelo is one of the important fruits in the agricultural industry and has high commercial value. However, pomelos are susceptible to disease. Detecting diseases in pomelos is crucial for maintaining the quality and quantity of production. However, disease symptoms in pomelos are often complex and difficult to accurately detect through human visual observation. Therefore, image processing is a solution for detecting diseases in pomelos. Convolutional Neural Network (CNN) is a type of artificial neural network architecture that is highly effective in analyzing and predicting diseases. In this study, a model is designed and built to detect and classify diseases in pomelos based on their skin. The study uses a dataset obtained from self-documentation using a digital camera, which includes images of Diplodia/Blondok, Cancer, Fruit Fly, and healthy pomelos. In the preprocessing stage, the dataset is divided into training, validation, and testing data. Feature extraction is also performed using thresholding, contour detection, and bounding boxes. During the model processing stage, a model is created using training data, validation data, hyperparameters, and transfer learning. The results of the study show that the DensNet121 model achieved an accuracy of 92%
KINERJA KEUANGAN PADA PERUSAHAAN TERDAMPAK KENAIKAN TARIF CUKAI HASIL TEMBAKAU (STUDI PADA PT HANJAYA MANDALA SAMPOERNA Tbk TAHUN 2017-2021)
Get PDFPeningkatan tarif cukai rokok akan mempengaruhi produksi rokok dan berimpas pada pendapatan dan tingkat keuntungan. Selama tiga tahun (2019-2021) laba usaha PT Hanjaya Mandala Sampoerna Tbk. mengalami penurunan yaitu dari 17.077 Miliard pada tahun 2019, menjadi 10.422 Miliard pada tahun 2020 dan menurun lagi menjadi 8,583 Miliard pada tahun 2021.Penurunan kinerja keuangan yang tampak pada penurunan besarnya laba merupakan salah satu indikasi adanya financial distress. Kondisi seperti ini perlu diwaspadai sekaligus diantisipasi oleh sebuah perusahaan, karena dapat menghambat kegiatan operasional Perusahaan. Tujuan penelitian adalah untuk mengetahui kinerja keuangan tahun 2017-2021 pada PT Hanjaya Mandala Sampoerna Tbk berdasarkan pendekatan Altman Z score dan Springate. Hasil penelitian memperlihatkan bahwa berdasarkan pendekatan Altman Z score dan Springate, tingkat financial distress akibat kenaikan tarif cukai tembakau tahun 2017-2021pada PT Hanjaya Mandala Sampoerna Tbk-HMSP berada dalam kategori sehat atau tidak ada potensi financial distress.
PROGRAM KEMITRAAN MASYARAKAT PADA UMKM “GERAKAN TERINTEGRASI KOPERASI DAN USAHA MIKRO (GERAI KOPI & MI)” DI KELURAHAN PEDALANGAN , KECAMATAN BANYUMANIK, SEMARANG
Get PDFKelurahan Pedalangan Kecamatan Banyumanik merupakan salah satu wilayah di Kota Semarang yang perkembangannya terjadi sangat cepat. Klurahan Pedalangan terkena dampak dari adanya kawasan pendidikan di kelurahan Tembalang. Banyak terjadi perubahan lahan dilihat dari adanya pembangunan perumahan baru dan pertumbuhan penduduk.Kelurahan Pedalangan, letaknya cukup strategis karena berada di tengah wilayah Kecamatan Banyumanik Kota Semarang.“Gerakan Terintegrasi Koperasi dan Usaha Mikro (Gerai Kopi & Mi)” merupakan sebuah program besutan Pemkot Semarang dalam rangka meningkatkan perekonomian di Kota Semarang. Kelurahan pedalangan adalah kelurahan yang mengambil peran dalam gerakan inovatif yang mampu mendorong ekosistem inovasi di lingkunan koperasi dan UMKM diwilayah kelurahan Pedalangan.Permasalahan Mitra : a). Aspek produksi dan sumber daya manusia : Ketrampilan SDM untuk melaksanakan proses produksi cukup baik namun belum didukung sarana produksi yang memadai,hasil produksinya sesuai dengan ketrampilan b). Aspek pemasaran : masih belum optimalnya promosi sehingga mempengaruhi jumlah penjualan produk UMKM c). Aspek administrasi keuangan: Masih minimnya pemahaman dan penerapan penataan manajemen keuangan yang baik,termasuk menghitung HPP .Metode yang diterapkan dalam program ini adalah : a). Pelatihan, b). Pendampingan c). Monitoring dan feed back.Kegiatan/ program yang direncanakan adalah : a) Pelatihan/ Pendampingan promosi melalui online/digital marketing/market place (Tiktok/yoetube/FB/IG dll) b). Pelatihan/ pendampingan tata kelola keuangan (termasuk perhitungan HPP). Luaran yang dihasilkan adalah : (a). Tersedianya media promosi online/ digital marketing/ market place (Tiktok/yoetube/FB/IG dll) (b). Terampilnya tata kelola keuangan (termasuk perhitungan HPP) .(c). Artikel ilmiah di jurnal ilmiah atau seminar nasiona