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Analysis of Resistance and Flow Velocity on Barge Skeg VariationsUsing Computational Fluid Dynamics Method
No full textThe maritime sector utilizes various technologies, including barges, which rely on tugboats for propulsion due to lacking their propulsion system. To enhance sailing efficiency, stern modifications through skeg additions can optimize performance, though these affect drag force and velocity. This study analyzed 12 skeg variations using Computational Fluid Dynamics (CFD) simulation via ANSYS Workbench software to determine optimal design configurations. At 4 knots, the analysis revealed variation 3 as the most efficient design, producing a drag force of 17,775.80 N and velocity-u of 2.07198 m/s. Similarly, at 8 knots, variation 3 maintained optimal performance with a drag force of 67,405.60 N and velocity-u of 4.1430 m/s. Results demonstrated that variation 3 consistently provided the most stable and optimal performance across low and high speeds. These findings provide valuable insights for future barge design considerations, offering a reliable reference for selecting optimal skeg configurations
Kajian Struktur Dasar Ganda pada Accomodation-Work Barge (AWB) Akibat Perubahan Fungsi Operasional dengan Pendekatan Metode Elemen Hingga
No full textAccomodation-Work Barge (AWB) merupakan jenis kapal tongkang tanpa sistem propulsi yang berfungsi sebagai tempat akomodasi bagi pekerja di sektor migas dan industri kemaritiman. Untuk menunjang sistem tambat, pemilik kapal melakukan modifikasi dengan mengubah tangki air tawar menjadi ruang mooring dan anchor winch. Alih fungsi ini menyebabkan terjadinya perubahan pola pembebanan pada struktur double bottom. Penelitian ini bertujuan untuk membandingkan kinerja struktur double bottom sebelum dan sesudah modifikasi pada tiga kondisi pembebanan, yaitu air tenang, sagging, dan hogging. Beban yang dianalisis meliputi muatan fresh water pada kondisi awal serta beban mooring dan anchor winch pada kondisi setelah modifikasi. Hasil analisis menggunakan pendekatan metode elemen hingga menunjukkan bahwa tegangan maksimum terjadi saat kondisi hogging sebesar 162,19 MPa sebelum modifikasi dan meningkat menjadi 184,66 MPa setelah modifikasi. Evaluasi faktor keamanan pada frame 20–25 di bawah ruang mooring mengalami penurunan, baik kriteria bahan maupun tegangan ijin BKI. Nilai Safety Factor minimum setelah modifikasi adalah 1,02 saat hogging. Hasil ini menunjukkan bahwa modifikasi ruang tangki berpengaruh signifikan terhadap penurunan kekuatan struktur double bottom
Karakteristik Bahan Baku Artefak Batu di Situs Paroto, Situs Talepu, Situs Calio dan Situs Jampu : Sumber Gamping Kersikan: Karakteristik Bahan Baku Artefak Batu
No full textThis research discuss about identification of raw materials for gravelly limestone artifacts in Walennae Valley area as the oldest settlement in Sulawesi with dating from 200.000 years ago. The method used for this research are library and field research (survey and interview) and also 3-dimensional recording. Data processing includes morphological-technological and petrological analysis with two analysis models, namely thin section analysis and spectrometric analysis on stone artifact samples. The results show that the morphological-technological material of limestone artifacts consists of two categories, core tools and retouched flakes. The identification of the limestone raw materials describe the process of limestone formation that occurs due to the transformation and weathering of CaCO3 compounds (calcite minerals) to form SiO2 compounds (silica minerals). In Walennae Valley, the human adaptation in utilizing and exploiting the raw materials for stone artifacts greatly influenced by the natural and environmental conditions of tropical forests.Penelitian ini merupakan kajian bahan baku artefak batu gamping kersikan di Situs Paroto, Situs Talepu, Situs Calio dan Situs Jampu.Pembahasan penelitian fokus pada karakteristik bahan baku artefak batu gamping kersikan Kawasan Lembah Walennae sebagai wilayah hunian tertua di Sulawesi yang berumur 200 kyr. Metode yang digunakan adalah pengumpulan data meliputi studi pustaka, survei lapangan, wawancara dan perekaman 3 dimensi. Selanjutnya pengolahan data yang terdiri dari analisis morfologi-teknologi artefak batu bahan gamping kersikan dan analisis petrologi dengan dua model analisis yaitu analisis sayatan tipis dan analisis spektrometri terhadap sampel artefak batu bahan gampingkersikan. Hasil penelitian menunjukkan bahwa morfologi-teknologi artefak batu bahan gamping kersikan memiliki kategori yang terdiri dua jenis yaitu alat inti dan serpih diretus. Alat inti meliputi tipe kapak genggam, kapak perimbas, kapak penetak dan pahat genggam sedangkan jenis serpih diretus meliputi tipe penyerut dan bilah. Karakteristik bahan baku gamping kersikan menggambarkan proses pembentukan gamping kersikan terjadi akibat dari transformasi dan pelapukan senyawa CaCO3 (mineral kalsit) yang tergantikan oleh senyawa SiO2 (mineral silika). Adaptasimanusia pendukung lembah walennae dalam memanfaatkan dan mengeksploitasi sumber bahan baku artefak batu sangat dipengaruhi kondisi alam dan lingkungan hutan tropis.
Kata Kunci : Bahan Baku, Paleolitik, Walennae, Gamping Kersikan, Analisis Petrolog
A Glance At Furnitur Bertutur: A Temporary Exhibition At Jakarta History Museum
No full textThe Furnitur Bertutur exhibition, held at the Jakarta History Museum from October 2024 to January 2025, presents an overview of Dutch East Indies or Indies style furniture as a manifestation of material encounters and hybridity between European and Nusantaran societies in colonial Jakarta/Batavia. This exhibition showcases various types of historical furniture mostly from the Verenigde Oostindische Compagnie (VOC) period, such as chairs, tables, and cabinets, highlighting craftsmanship and cross-cultural influences mirroring the multi-layered history of Jakarta. This paper aims to inquire the exhibition practice while providing constructive criticism regarding its substance from critical museology, art history and interior architecture perspectives. The method used is a comparative architectural criticism, involving direct observation towards the exhibition’s presentation, an analysis of its narrative and displayed information, spatial layout, and curatorial approach, then compare them with relevant historical and theoretical references. The exhibition manages to display the richness of Indies furniture in an attractive and engaging setting. The integration of digital catalogue as explanatory medium is effective and the catalogue itself is well designed. There are however notable shortcomings. In the display space, several items seemed to be out of scope thematically and chronologically, while reconstructed rooms show anachronistic elements that may misled casual observers. In its narrative, some of the omitted information obscure the exhibition’s scope, as well as crucial aspects of Batavian live which could have enhanced understanding of the displayed pieces. Some statements seem to contradict referenced sources and are not sufficiently discussed, giving the negative impression of a didactic revision. Nevertheless, this exhibition deserves appreciation for reigniting interests in Indies furniture as a complex historical heritage. Some of its significant elements have the potential to be preserved as part of the museum’s permanent exhibition.
Pemetaan Tiga Dimensi Gua Aul Di Desa Cikupa-Ciamis, Jawa Barat Menggunakan Terrestrial Laser Scanner (TLS)
No full textThis study examines the potential of Terrestrial Laser Scanner (TLS) technology in documenting and understanding the characteristics of cave spaces as part of geospatial and cultural heritage. The study was conducted in Aul Cave, West Java, as part of efforts to preserve and interpret underground spaces through a digital spatial approach. Using the Trimble X7 TLS, this research produced a comprehensive three-dimensional representation of the cave structure, including its geometric shape and surface characteristics. The analysis focused on the differences in material properties between natural elements such as stalactites and rock walls, and artificial materials such as cement and paving blocks, based on laser reflection intensity values. Through this approach, the study not only provides precise visual documentation but also opens up possibilities for interpreting the function of cave spaces and indications of past human activity. The results of the study show that TLS is not only effective as a documentation tool but also relevant as a spatial analysis method in archaeological, geospatial, and cultural heritage preservation studies. This approach is expected to encourage broader utilization of digital technology in spatial-based research and the preservation of underground cultural heritage.
Jejak Budaya Lokal Dalam Perkembangan Semarang Night Carnival 2011–2022
No full textThis article explores the Semarang Night Carnival (SNC) as a means of cultural preservation and a reinforcement of the local identity of Semarang City within the realms of tourism and the creative industry. Since its inaugural event in 2011, SNC has developed into an annual cultural festival featuring costumes with local and national cultural themes presented through costume parades and visual narratives. This study employs a descriptive qualitative approach with historical methods, utilizing primary and secondary data in the form of archives, documentation, interviews, and scholarly references. The findings reveal that SNC is not merely a performance but also serves as a medium for education, cultural promotion, and the empowerment of local artists and costume artisans. Themes such as Warak Ngendog, Paras Semarang, Kemilau Nusantara, and Trilogy serve as visual representations of harmony, acculturation, and the richness of local culture. Strengthening cultural events based on local wisdom can be an effective strategy to enhance the city’s image, increase tourism appeal, and foster a sustainable creative economy ecosystem
Kajian Gua Umang Tanjung Pulo dalam Konteks Folklor dan Budaya Lokal
No full textFolklore is one of the cultural products that often underlie the existence of an archaeological site, one of which is the Umang folklore that frames the archaeological site of the Umang Cave in Tanjung Pulo, Tiganderket District, Karo Regency, North Sumatra Province. This study aims to descriptively outline the archaeological aspects of Umang cave tanjung pulo, the folklore that forms the background story of the cave’s existance, as well as the relationship between the two. The methods used include observation (object description, measurement, documentation, and environmental observation); an ethnographic approach through interviews, and literature review. The result of this research are: the umang folklore that developed among the Karo people is part of the Nusantara folklore. Specifically in Sumatera, such supernatural beings are generally known as bunian. The Umang Cave in Tanjung Pulo has similarities with other Umang Caves, and the existing relief carvings provide an ilustration of its fuction. Currently, the Karo people no longer regard The Umang Cave as part of their cultural heritage, but rather view it as an object related to the supernatural being called umang
Religious Energizer and Librarians’ Performance
No full textReligious energizer is a term that is frequently used to define an individual who serves as a facilitator in everyday life, including work, based on their knowledge and religious teaching. In the librarians’ circumstances, the religious energizer behavior can be observed through their attitudes at work. These behaviors arise from their experience and religious knowledge, which then disseminate to their work circumstances and relatives. This research aims to determine the religious activities carried out by librarians as religious energizers to support their performance at UIN Imam Bonjol Padang. This research is descriptive with a qualitative approach, using interviews, observations, and documentation methods to get information and data. The object of this research is the UIN Imam Bonjol Padang library, while the subjects are three librarians of UIN Imam Bonjol as informants. The samples are generated based on a purposive sampling technique with particular criteria such as respect for librarians in work. After getting information and data, the author analyzed the data using triangulation, considering several steps such as data reduction, data display, and drawing conclusions. The finding revealed that three main activities reflect religious energizers performed by librarians at the State Islamic University of Imam Bonjol, Padang, such as 1) participation in religious practices, 2) sharing information, and 3) morning meetings. These activities bring librarians positive energy and vitality, conceivably upgrading their mental and emotional stability at work. Therefore, it is evident that religious energizers can improve the performance of librarians at the UIN Imam Bonjol, Padang library
IMPLEMENTASI EDMS DALAM PENATAAN DOKUMEN DI RAIL DOCUMENT SYSTEM PT. KERETA API INDONESIA (PERSERO) DAERAH OPERASI 1 JAKARTA
No full textTo ensure the availability of information needed by employees of PT KAI (Persero) Operating Area 1, EDMS becomes a solution that utilizes information technology and communication in its management. This research uses a qualitative approach with descriptive case study research method. The research data was obtained through observation, interviews and document studies. The results of this study indicate that the implementation of EDMS in structuring documents of PT KAI Daerah Operasi 1 Jakarta using the Rail Document System serves to cut time in the bureaucratic process; saving resources; and more efficient and effective access. This can be reflected in the findings obtained by researchers indicating that these components have been implemented in electronic document processing activities, although in practice there are still things that need to be improved to improve the effectiveness and efficiency of the RDS system
IMPLEMENTASI KEBIJAKAN STANDAR NASIONAL PERPUSTAKAAN PERGURUAN TINGGI: DI PERPUSTAKAAN UNIVERSITAS NEGERI MALANG
No full textThe purpose of this study was to determine and describe the implementation of the National Standards for Higher Education Libraries (SNP-PT) that have been carried out by UM Library. The method used in this research is a combination of qualitative-quantitative, by observing and conducting interviews related to the implementation of the SNP-PT at the UM Library as well as using data in the form of numbers on the performance indicators of each component of the national standard. Achievement of collection indicators, UM Library have implemented 12 out of 14 collection standards for higher education libraries (85,7%). Achievement of facilities and infrastructure indicators, UM Library have implemented 18 of 19 standard facilities and infrastructure for higher education libraries (94,7%). Achievement of service indicators, UM Library have implemented 5 out of 5 service standards for higher education libraries (100%). Achievement of staff indicators, UM Library have implemented 8 out of 10 staff standards for higher education libraries (80%). Achievement of standard administration indicators, UM Library has implemented 6 out of 7 higher education library administration standards (85,7%). Achievement of management indicators, UM Library have implemented 12 out of 12 management standards for higher education libraries (100%). This research shows that the implementation of the SNP-PT policy has been “good” done in UM Library with an average achievement 91,01% of the standards that have been set