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Analisa Kerusakan Boost Pressure Sensor Pada Unit Excavator Komatsu HB 365-1
Full text linkExcavator Komatsu HB 365-1 merupakan salah satu unit alat berat yang menggunakan hybrid technology sehingga optimal digunakan untuk berbagai sektor, seperti konstruksi, pertambangan batu bara, dan mineral seperti nikel, emas, timah, dan bauksit. Menggunakan Engine Common Rail SAA6D114E-5 dengan sistem EGR (Exhaust Gas Recirculation) dan penggunaan boost pressure sensor pada intake manifold serta tambahan komponen generator, kapasitor, dan motor listrik membuat teknologi hibrid tersebut sangat membantu proses bongkar muat menjadi lebih hemat bahan bakar dan ramah lingkungan dengan cara mengurangi emisi CO2 di tengah proses pengoperasiannya. Tujuan dari penelitian ini adalah untuk mengetahui penyebab utama dari sering terjadinya kerusakan boost pressure sensor pada unit tersebut. Metode penelitian yang digunakan yakni menggunakan metode 8 step troubleshooting. Hasil penelitian menunjukkan bahwa berdasarkan data dan dokumentasi hasil pemeriksaan yang telah di kumpulkan, di dapatkan penyebab permasalahan ini terletak pada poor durability dari boost pressure sensor akibat dari sistem intake manifold yang terhubung dengan sistem EGR. Panas dan jelaga dari sistem EGR merambat menuju sistem intake manifold sehingga material dari boost pressure sensor mengalami cacat/melepuh akibat terkena panas secara terus menerus serta ujung sensor tertutup oleh jelaga menyebabkan blacksmoke pada muffler dan munculnya failure code (CA122) charge air pressure sensor high error pada monitor panel unit. Upaya perbaikan yang di lakukan adalah dengan mengganti part tersebut dan juga melakukan perawatan secara berkala pada sistem intake manifold dan EGR guna meminimalisir komponen-komponen lain yang terhubung dengan sistem tersebut ikut mengalami kerusakan
Penambahan Heat Exchanger Untuk Recovery Steam Pada Venting 2-E-006 Untuk Dijadikan Kondensat
Full text linkPT. Multi Nitrotama Kimia (MNK) is a leading provider of mining explosives and blasting services in Indonesia, producting nitric acid and ammonium nitrate. In the productiion process, excess steam generated by the wet heat boiler is vented into atmosphere. This study aims to recover the thermal energy from the vented steam by adding a Shell and Tube Heat Exchanger is utilized with a cross-flow configuration, where steam flows through the shell side and cooling water through the tube side. The exchanger is designed with a shell diameter of 406.4 mm (16 inches) and tube outer diameter of 19.05 mm (¾ inch) following IPS (Iron Pipe Size) standards and BWG 16 wall thickness. The unit consists of 90 tubes, each 2 meters long, arranged in a triangular pitch layout to optimize heat transfer area. Tubes are made of stainless steel to ensure corrosion resistance. The effective heat transfer area is calculated to be 27.05 m². The system produces condensate at 99.59°C with a flow rate of 1087.26 kg/h and achieves energy savings up to Rp945,529,832 annually
Pemanfaatan Pasir Lokal Kecamatan Palaran Kota Samarinda Kalimantan Timur sebagai Material Pembuatan Beton Normal
Full text linkThe local sand utilization is expected as an alternative to achieve more efficient construction cost. The availability of adequate local sand in Samarinda is located in Palaran sub-district. Palaran sub-district is the third largest sub-district of 10 sub-districts in Samarinda. Geographically, the sub-district has 5 villages with a land area of 156.29 km2. Besides Palu sand, the local community generally uses two local sand types for construction, mountain sand in Bantuas village and river sand in Handil Bakti village. This study aims to obtain an alternative local sand material for forming concrete having good concrete compressive strength. For this reason, some sand material tests will be carried out: gradation tests, specific gravity and absorption, water content, mud content and unit weight. For the gravel test, the sand test is added with an abrasion test. The concrete compressive strength test result showed local sand from the mountain sand of Bantuas village has a higher compressive strength compared to other variations, concrete using Palu sand and concrete using Handil Bakti Village River sand. The results of the 14-day compression test obtained the concrete strength using mountain sand from Bantuas Village of K-304.60, river sand from Handil Bakti Village of K-240.27, and Palu sand of K-248.27. While,the 28-day compression test result obtained the concrete strength using mountain sand from Bantuas Village of K-337.68, river sand from Handil Bakti Village of K-247.06, and Palu sand of K-274.40
Rekognisi Tulisan Kaligrafi Dengan Menggunakan Metode Convolutional Neural Network Arsitektur MobileNetv2
Full text linkThis research aims to develop an automatic classification model to recognize the type of Arabic calligraphy writing using MobileNetV2 Convolutional Neural Network (CNN) architecture. Arabic calligraphy has a visual uniqueness and complexity of letterforms that become a challenge in the classification process, especially for ordinary people. The four main calligraphy types used in this research are Tsulust, Naskhi, Diwani, and Kufi. The research follows the CRISP-DM stages which include business understanding, data understanding, data preparation, modeling, evaluation, and deployment. The dataset used is the HICMA dataset consisting of 5,031 calligraphy images. The data is processed through cropping, normalization, and resizing to 224x224 pixels. The model was trained with epoch variations (10, 20, 30, and 40) to obtain the best configuration. The results show that the model at the 20th epoch has the most optimal performance with a testing accuracy of 97.52%. Evaluation of classification metrics showed high F1-Score values in the majority classes. The previously low-performing Kufi class was improved through data augmentation techniques to obtain an F1-Score value of 0.99. The model is then integrated into a Flask-based web application that allows users to upload images and receive classification results directly. The results of this research show that MobileNetV2 is effective for Arabic calligraphy type classification and can be practically implemented for educational purposes as well as digital preservation of Islamic culture
Perancangan Portal Online Course Untuk Menjadi Penulis Buku Dan Ilustrator Studi Kasus Bersamaadya.Com
Full text linkTechnological developments have encouraged the emergence of new learning methods through online courses, which allow learning to take place anytime and anywhere. In Indonesia, interest in writing and illustration is increasing, marked by the emergence of many new writers and illustrators due to the ease of publishing digital and printed works. However, there is no dedicated platform that can accommodate and support the development of creativity in these fields. To address this need, BersamaAdya.com, through the Adya Foundation, designed an online course platform focused on literacy, with the aim of providing access to relevant learning and guidance from experienced mentors so that aspiring writers and illustrators are able to produce creative works worthy of the industry. The system was designed using a prototype method through the stages of UML, ERD, and Low and High Fidelity design, then tested using the System Usability Scale (SUS) method. The test results showed an average score of 77.97, which falls into the Good, Grade C, and Acceptable categories, so the system is considered feasible and has the potential to become a platform for the development of writers and illustrators
Effect of Cold Plasma Treatment on Total Dissolved Solids (TDS) Concentration and Functional Groups in Turmeric (Curcuma longa) Powder in Water
Full text linkCold plasma technology has garnered increasing interest in food and agricultural applications due to its ability to induce surface modifications in organic materials without the use of high temperatures. While its antimicrobial properties are well-documented, recent studies have highlighted its potential in altering the physicochemical characteristics of biopolymers, particularly through modification of surface functional groups. These modifications can influence material behavior in aqueous environments, including solubility and dispersion properties. Turmeric (Curcuma longa), widely used for its bioactive compounds, often faces limitations in its application due to poor solubility in water. Enhancing its solubility could increase its bioavailability and broaden its use in food and pharmaceutical products. This study investigates the effect of cold plasma treatment on turmeric powder, particularly its impact on the concentration of total dissolved solids (TDS) and the modification of functional groups that contribute to solubility. By exposing dried turmeric powder to cold plasma, this work aims to assess its potential to improve the aqueous dissolution of turmeric through structural and chemical surface changes, as characterized by Fourier-transform infrared spectroscopy (FTIR). The results indicate an increase in polar groups such as O–H, N–H, and C–O, and a reduction in non-polar groups such as aliphatic C–H. These modifications suggest enhanced hydrophilicity and solubility of the plasma-treated turmeric powder compared to the untreated sample. Overall, this study demonstrates that cold plasma treatment can serve as an effective technique to improve the solubility characteristics of turmeric, potentially expanding its applications in food, and pharmaceutica
Pengaruh Temperatur Pelelehan Plastik Polypropylene Terhadap Kuat Tekan Paving Block
Full text linkPlastik banyak digunakan dalam kehidupan sehari-hari, sehingga penggunaannya dalam masyarakat modern mengalami peningkatan yang pesat. Plastik mempunyai keunggulan seperti kuat, ringan, dan stabil, namun sulit terurai oleh mikroorganisme dalam lingkungan. Penelitian ini bertujuan untuk mengetahui pengaruh temperatur pelelehan plastik polypropylene pada pembuatan paving block, serta menentukan temperatur optimum untuk pembuatan paving block menggunakan plastik polypropylene sebagai bahan perekat. Metode penelitian yang digunakan adalah eksperimen dengan komposisi komposisi 10% PP : 90 % Pasir , 20% PP : 80 % Pasir, 30% PP : 70 % Pasir Hasil menunjukkan bahwa temperatur optimal untuk kuat tekan tertinggi berada pada 240°C pada semua komposisi, dengan nilai kuat tekan masing-masing 6,11 MPa, 6,98 MPa, dan 7,70 MPa. Pada temperatur 260°C, kuat tekan mengalami penurunan signifikan karena pengaruh suhu tinggi yang mengurangi daya ikat plastik terhadap pasir. Penurunan ini disebabkan oleh perubahan sifat material pada suhu yang lebih tinggi, yang mengurangi kemampuan plastik PP sebagai pengikat pasir.sehingga tidak masuk kedalam mutu paving block sesuai dengan SNI 03-0691 (1996)
Evaluasi Kekuatan Daya Dukung Pondasi Bored Pile Dengan Struktur Slab On Pile (Studi Kasus Pada Slab On Pile Sta 14+045 Jalan Tol IKN Paket 3a KKT Kariangau-Karang Joang)
No full textThis study aims to evaluate the load-bearing capacity and strength of the bored piles based on their dimensions and soil testing parameters. SOP 1 STA 14+065 is part of the IKN Toll Road Package 3A KKT Kariangau-Karangjoang, which uses pile slabs due to the soft soil conditions along the road's alignment. A PDA test was conducted to assess the load-bearing capacity of bored pile foundations with an 800 mm diameter with varying depths. Samples from Pile Points P4 B 131 and P4 B 152 were selected because they did not meet the minimum PDA target of 419.6 tons, raising concerns about potential settlement or even structural failure.The load analysis and calculations on the slab-on-pile structure were performed manually based on SNI 1725:2016 "Loading for Bridges" and SNI 2833:2016 "Bridge Design for Earthquake Loads". The slab-on-pile dimension analysis was assisted by the SAP2000 V.14.2.2 software.The study's results show that the static load-bearing capacity at Point P4 B 131 is 12.87% (36.085 tons) lower than the PDA test result. At Point P4 B 152, the static load-bearing capacity is 39.85% (108.67 tons) higher than the PDA test result. The analysis of the SOP 1 Segment 6 model using SAP2000 V.14.2.2 found that the vertical strength required for Piles P4 B 131 and P4 B 152 is 645.25 kN (65.8 tons) and 435.36 kN (44.4 tons), respectively. The allowable load-bearing capacity available in Piles P4 B 131 and P4 B 152 is 118 tons and 65 tons based on the PDA test, and 103.166 tons and 109.068 tons from static load calculation methods. Keywords : Slab on pile, PDA Test, Bearing capacity, Bored pile, SAP200
Pemanfaatan Fly Ash Sebagai Bahan Alternatif Pada Bata Beton Untuk meningkatkan Peredaman Panas
Full text linkPemanfataan fly ash sebagai bahan tambah bata beton memberikan dampak positif terhadap lingkungan, selain mengurangi pencemaran lingkungan. Fly ash memiliki kandungan silikat yang kemiripan seperti semen, penambahan fly ash pada campuran bata beton bisa menjadi bahan tambah mineral yang baik untuk bata beton karena fly ash tersebut mengandung silika yang bersifat mengikat. Penelitian ini bertujuan untuk mengetahui pengaruh limbah fly ash sebagai bahan tambah terhadap peredaman panas serta mengetahui nilai komposisi yang tertinggi dan terendah untuk penambahan limbah fly ash terhadap bata beton agar dapat meredam panas. Metode yang digunakan dalam penelitian ini adalah metode full faktorial dengan variabel proses fly ash : pasir 10% : 60%, 20% : 50%, 30% : 40% dan lama pengeringan 3 dan 5 hari, dan dilakukan uji peredaman panas sebagai respon yang diamati dengan jumlah 6 spesimen dan 3 kali replikasi pada setiap spesimen. Berdasarkan hasil penelitian yang diperoleh menunjukkan bahwa spesimen dengan fly ash : pasir 30% : 40% dengan waktu pengeringan 5 hari mendapatkan nilai tertinggi sebesar 6,6oC. sedangkan fly ash : pasir 10% : 60% dengan waktu pengeringan 3 hari mendapatkan nilai terendah sebesar 4oC
Sistem Pusat Pelayanan Anak Untuk Optimalisasi Perkembangan Anak Berbasis Web
Full text linkIn the current era, advances in information technology have led to an urgent need for more efficient management systems and services, especially in the context of children's services. Certified Independent Study offers students the opportunity to prepare themselves in full stack web development, with the aim of producing high quality and competitive web applications. The developed children's center web application is designed to handle various aspects of children's administration and services as a whole. The main features of the application include registration, health monitoring, education management, as well as coordination of social activities. This integrated platform not only allows parents and related parties to access real-time information but also facilitates better collaboration in providing optimal services to children. The research shows that the method applied in the development of this application is effective in improving efficiency and ease of use, with the results of the System Usability Scale (SUS) assessment reaching an average of 83.3 which indicates the predicate "Good". Thus, this child service center web application is expected to be an innovative solution to overcome various challenges in child services and support holistic growth and development of children