Teknosia

ANALISIS LAJU KOROSI PADA BAJA ASTM A36 DENGAN VARIASI TEMPERATUR DAN WAKTU PERENDAMAN DALAM ALIRAN AIR LAUT

2024-12-13T13:32:26+00:00

Abstract: Technological developments in the maritime industry are increasing rapidly, but the problem of corrosion is a problem that still often occurs due to factors such as temperature, humidity and chemical content in the air. The most widely used metal in the maritime industry, especially in ship hulls, is ASTM A36 steel which is a low carbon steel. The purpose of this study was to determine variations in temperature and immersion time on the corrosion rate of ASTM A36 steel. In immersion using variations of immersion time of 24, 72 and 120 hours. With temperature variations of 29oC, 32oC and 35oC. The results of the study showed that the highest corrosion rate value occurred in ASTM A36 steel which was soaked at 35c which showed a corrosion rate value of 25.1965 mmpy (24 hours), 30.9557 mmpy (72 hours), 41.3223 mmpy (120 hours). then in the test sample material pitting corrosion and erosion corrosion occur. The results of this study show that high temperatures can accelerate the rate of corrosion in the marine environment.

PERENCANAAN ULANG STRUKTUR ATAS JEMBATAN MENGGUNAKAN BALOK-T BETON BERTULANG JL. BROMO KECAMATAN BARENG JOMBANG

2024-12-11T12:40:54+00:00

Bridges are one of the important infrastructures in the transportation system that play a role in connecting two locations separated by rivers, valleys, or other roads. The Jl. Bromo Bridge is planned to span 10 meters. Initially, this bridge used an arched type structure that was built during the Netherlands colonial period so that there was a need for structural rejuvenation due to the increasing volume of vehicles. The researcher replanned using a conventional concrete girder of T type by calculating the loading aspect referring to SNI 1275-2016, planning the repetition and repetition dimensions on the T-girder, and deflection control on the bridge. The results of the calculation on the replanning of the bridge upper structure were obtained as a result of the sidewalk weight (PMS) of 17.13 kN (MMS) 12.87 kNm, the nominal moment of the plan on the backrest wall was 0.0076, the reinforcement area was 152,233 mm2, the reinforcement D was 16 - 130 mm. The sliding span used is D 13 – 250 mm. The results of the calculation of the ultimate moment of loading (MU) that occurred on a beam of 1,482 kNm and the ultimate shear force (VU) of 598.44 kN with beam reinforcement were used 5 D32 with stiff reinforcement 22 – 100 mm. combination of deflection 0.017 < 10/240 = 0.042, with the use of diaphragm 2 D19 reinforcement, with a stiff reinforcement of 16 -120 mm.

THE EFFECT OF FIBER SEQUENCE ON THE PHYSICAL AND MECHANICAL PROPERTIES OF AGEL FIBER/FIBERGLASS REINFORCED HYBRID COMPOSITES USING VACUUM INFUSION TECHNIQUE

2024-12-12T04:57:15+00:00

This research was motivated by using agel fiber which is easy to obtain and the effect of agel fiber which is hybridized using glass fiber using the vacuum infusion technique. This research aims to determine the effect of fiber arrangement on the mechanical and physical properties of agel/ fiberglass reinforced hybrid composite using the vacuum infusion technique. The main materials used in this research are agel fiber, fiberglass, ripoxy vinyl ester resin, methyl ethyl ketone peroxide (MEKP) catalyst and EX promoter. The process of making a specimen begins with preparing a mold from acrylic, then arranging the fibers based on predetermined variations in the arrangement. Resin, catalyst and promoter are mixed in a ratio of 400:40:1. Then stir until evenly mixed, then pour it into a container that is connected to the mold, after that the vacuum infusion process is carried out until the fiber structure in the mold is completely covered. The finished specimen is formed based on the testing standards. Bending test bending test uses ASTM D-790 standard, impact test uses ASTM D-5941 standard, tensile test uses ASTM D-638 standard, and density testing uses ASTM D-792 standard. The results of this research show that the mechanical and physical testing of the Agel-Gelas-Gelas-Gelas-Gelas-Gelas-Agel arrangement has the best bending strength, impact toughness and highest tensile strength, producing values of 236.69 MPa, 62.97 kJ/ m² and 84.1 MPa, while for testing the best density was obtained in the Gelas-Agel-Agel-Agel-Agel-Agel-Gelas G-5A-G arrangement of 1.19 gr/cm³.

PENERAPAN METODE LOCATION BASED SERVICE (LBS) DALAM APLIKASI PRESENSI PEGAWAI PADA UNIVERSITAS DEHASEN BENGKULU

2024-12-30T03:50:56+00:00

: This research develops a web-based attendance application using Location Based Service (LBS) technology at Dehasen University Bengkulu to overcome the limitations of fingerprint devices that often experience problems in recording fingerprints and other technical obstacles. The application was developed using the Waterfall method through the stages of needs analysis, system design, program code writing, testing, and implementation and maintenance. Designed using the Unified Modeling Language (UML) approach, and created using the Laravel framework and MySQL database. The attendance application has two main interfaces: admin and employee interface. The admin interface allows management of attendance data, real-time attendance monitoring, verification of leave or permission approval, and configuring attendance location points. The employee interface facilitates GPS-enabled attendance for inbound and outbound attendance, leave or permit applications, and access to attendance history. The test results show that the attendance application improves accuracy and efficiency in recording employee attendance. However, the presence application is still unable to detect location manipulation and further development is expected to detect or block location manipulation attempts.

UI/UX DESIGN OF AN INTEGRATIVE MOBILE APPLICATION FOR MULTIMOSQUE MANAGEMENT FRIENDLY TO TAKMIR USING THE DESIGN THINKING METHOD

2024-12-11T12:43:12+00:00

The mosque serves as a center for community development, the cornerstone of Islamic society, and the foundation of civilization. According to data from the Ministry of Religious Affairs through the SIMAS (Masjid Information System) application, there were 242,832 mosques and 269,076 prayer rooms in Indonesia as of 2022. However, mosques and prayer rooms in Indonesia face issues like low activity levels and management often dominated by elderly individuals. Therefore, this research aims to design an integrative multi-mosque management application specifically for mosque caretakers (takmir) to manage mosques effectively and make them centers of community activities. This study uses the Design Thinking method, consisting of five stages: empathize, define, ideate, prototyping, and testing. The result is the design of a mosque management application named Kaffah, with seven main features: congregation data, congregation activities, mosque staff data, calendar, takmir, event list, and event data. These features are expected to assist takmir in managing the mosque and congregation data, the mosque becomes bustling with visitors and making the mosque a hub for community activities. Testing the Kaffah application's interface design shows that the developed prototype successfully aids and meets the needs of takmir in managing mosques.