IPTEK Journal of Proceedings Series
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Study of Core Material Sandwich Panel In Ship Construction
Get PDFAbstract¾Sandwich panel in ship construction necessitates identification for the core material. Non-metal cores of sandwich materials were identifiedin this study for polyurethane foam, polyresin, and synthetic resin. This material identification was conducted through experiments using Det Norske Veritas (DNV) standard tests. The experiments conducted were reactivity test, density test, and tensile test. Results of the investigation show that the core material suitable for the sandwich panel is synthetic resin with composition of 50% resin,50% talc and 0.3% catalyst. The density of the material is 1,728 kg/m3, tensile strength is 24.75 Mpa, modulus of elastisity is 546.95 Mpa, and shear modulus is 273.48 Mpa.
Excavation Analysis using Stress Path Dependent Soil Parameters
Get PDFThis paper presents numerical analyses of an excavation using stress path dependent soil parameters, where soil elements in a region of an excavation are represented by specific soil parameters that correspond to their specific stress paths. The performance of the M1 excavation pit in Berlin sand was selected as the analysed case. This excavation pit was supported by diaphragm-wall with a single row of pre-stressed anchors. The numerical analyses of the excavation were performed using finite element program PLAXIS 3D. Mohr-Coulomb model and Hardening Soil model were used as the soil constitutive models. The analyses were performed using two approaches, which are: (i) analysis using axial compression soil parameters, and (ii) analysis using stress path dependent soil parameters. A set of conversion ratios were employed to convert the general soil parameters (i.e. axial compression stress path) to the soil parameters of the other stress paths. These conversion ratios were obtained from an experimental program of true triaxial tests conducted on Bangka sand. The comparison of the field records and the analysis results were discussed. The results show that the stress path dependent approach produced better prediction of diaphragm-wall deformation compare to the general approach using axial compression soil parameters
Island Berth Untuk Kapal Tanker 85000 DWT Loading Oil Product: BBM Ron 85 Tersus PT. Badak NGL Bontang
Get PDFSeiring dengan peningkatan permintaan Bahan Bakar Minyak (BBM) jenis premium yang diprediksi oleh BUMN minyak dan gas (MIGAS) sebesar 31 juta kiloliter dimulai dari tahun 2013, maka PT. Pertamina (Persero) berencana untuk meningkatkan kapasitas kilang-kilang minyak yang ada dengan cara melakukan pengembangan untuk kilang baru yang akan diletakkan pada area offshore PT. Badak NGL Bontang. Kilang tersebut direncanakan mengalami penambahan kapasitas produksi sebesar 200.000 barel/hari. Untuk mendukung peningkatan kegiatan produksi dan pengiriman Bahan Bakar Minyak Premium diperlukan adanya suatu dermaga yang dapat melayani peningkatan arus bongkar muat minyak yang akan meningkat seiring dengan peningkatan produksi. Dermaga Island Berth yang direncanakan adalah dermaga minyak untuk kapal tanker dengan kapasitas 85000 DWT. Perencanaan dermaga baru ini telah diwujudkan dalam bentuk gambar rencana pengembangan dermaga. Namun untuk mewujudkan pembangunan dermaga tersebut diperlukan detail engineering desain yang meliputi perencanaan loading platform, breasting dolphin, mooring dolphin, catwalk, dan floating pontoon. Selain detail engineering desain perlu juga ditinjau kebutuhan kedalaman perairan pada area dermaga Island Berth, hal ini dikarenakan kedalaman perairan harus mencukupi draft dari kapal 85.000 DWT yang direncanakan akan bersandar di dermaga minyak PT. Pertamina (Persero). Pengerjaan konstruksi dermaga Island Berth sepenuhnya dilakukan di laut, sehingga dalam pengerjaannya digunakan kapal pontoon sebagai direksi kit. Perencanaan dermaga Island Berth ini mencakup perencanaan fasilitas laut, perencanaan struktur dermaga, dan perencanaan alat-alat yang digunakan untuk proses bongkar muat. Selain itu perlu juga direncanakan terkait metode pelaksanaan pembangunan yang akan digunakan dalam pembangunan dermaga tersebut. Dalam perencanaan dermaga juga harus ditinjau terkait rencana anggaran biaya dari dermaga tersebut. Dari hasil analisis perhitungan didapatkan kebutuhan dermaga dengan ketentuan Loading Platform sebesar 35,5 x 24 m2, Breasting dolphin 8 x 8 m2, Mooring Dolphin 6,5 x 6,5 m2 ,Catwalk dengan panjang 24, 28, dan 30 meter, dan struktur floating pontoon
Security Quality Measurement Framework for Academic Information System (AIS) Based on ISO/IEC 25010 Quality Model
Get PDFAbstract¾ Academic Information System (AIS) is a CASE tool that can improve efficiency and operational effectiveness of a university. It is necessary to guarantee its security quality. In addition, AIS has different characteristics from other software. This study aims to establish a framework to measure the quality of security on the AIS application domain. The framework is built based on ISO/IEC 25010 quality model. The resulting framework showed that it can measure 20 additional security aspects and produce an aggregated security value compared to the existing quality measurement standard. It is also able to improve the quality of the case study system by an increase in security value of 15.6%
Penentuan Prioritas Penanganan Aksesibilitas Infrastruktur Kawasan Perbatasan di Desa Kumba Kecamatan Jagoi Babang Kabupaten Bengkayang
Get PDFPrioritas dalam penanganan infrastruktur dipilih sebagai upaya strategi terbatasnya dana yang ada. Studi ini bertujuan untuk menentukan skala prioritas penanganan aksesibilitas infrastruktur di Desa Kumba Kecamatan Jagoi Babang Kabupaten Bengkayang.Studi ini membutuhkan data-data aksesibilitas dan kondisi infrastruktur dasar yang diperoleh dari instansi terkait, observasi lapangan dan interview. Studi ini menggunakan metode IRAP (Integrated Rural Accessibility Planning). Tingkat aksesibilitas menggunakan beberapa indikator aksesibilitas tiap infastruktur.Hasil penelitian menghasilkan bahwa tingkat kesulitan aksesibilitas terbesar di Dusun Saparan dan Dusun Sindang Kasih adalah akses terhadap sektor pasar dengan nilai aksesibilitas masing-masing 15,422 dan 15,000. Intervensi utama yang dilakukan untuk perbaikan aksesibilitas terhadap sektor pasar adalah fasilitas dari sektor ini yaitu dengan membangun pasar atau tempat penampungan hasil di kedua dusun, dan intervensi kedua adalah penanganan prasarana transportasi berupa perbaikan jaringan jalan
The effect of opening on building envelope toward daylight performance in Betang House at Central Borneo
Get PDFThe traditional house is able to adapt the climate around them and it can reduce the burden of energy use to adjust the comfort of occupants. The development pattern of occupants’ activity adjusts to a modern life that indirectly affects the function and condition of the building. This gives rise to a new phenomenon, whether development sheath openings in buildings can still meet the needs of lighting for the activity of the occupants. This research was conducted with the aim to clarify and identify the deployment sheath openings in buildings on the performance of natural lighting in Betang House. The method experiment with the help simulation is used to find a causal relationship from deployment sheath openings in Betang House building performance against natural lighting. The experiment is conducted with the simulation using Autodesk Ecotect Analysis 2011. The final result of the research indicates deployment openings in the façade have natural lighting performance that already meet the standards of the lighting for the activity. Deployment openings with the addition of extents openings could increase illuminantion and daylight factor space by 10% and 14%, but the value of the resulting illuminantion uniformity is not too high. The addition of height can increase the value of daylight factor of 13%. The ratio of lighting uniformity additional height opening is higher, but that resulted being lower illuminantion 0.3%. Rumbak tahansengan deployment at facade can improve the ratio of the lighting uniformity for activity up to 9.6%
Remote Sensing Analysis Using Landsat 8 Data For Lithological Mapping - A Case Study In Mount Penanggungan, East Java, Indonesia
Get PDFAbstract ¾ Mount Penanggungan is one of the volcanoes that located in East Java Province, Indonesia, with the current status is a sleeping volcano. Although Mount Penanggungan is not active, it still make an interesting investigation in geological survey, especially to identify the lithological units, due that less researchers took place in Mount Penanggungan. Geological survey and investigaton can describes the information about physically condition of some land or region, with the result is Lithological Map of Mount Penanggungan. Remote sensing imagery, such as Landsat 8 Satellite imagery data series has been used widely in geology for mapping lithology in general. Remote sensing provides information of the properties of the surface exploration targets that is potential in mapping lithological units. Remote sensing technique are one of the standard procedures in exploration geology, due to it is high efficiency and low cost. Lithological mapping in Mount Penanggungan area is carried out by using Landsat 8 Satellite imagery data with image enhancement techniques, including RGB (red, green, blue) band composite, and combine it with Indonesian Surface Map data that will makes an existing Lithological Map of Mount Penanggungan. The results of this study showed the distribution of the lithological units in Mount Penanggungan, which the units are; vulcanic breccia, tuff breccia, and andesitic lava
Computational Fluid Dynamics Simulation of Clearance Effect in High Solid Loading Polydisperse Solid-Liquid Mixing
Get PDFA high solid loading concentration of solid-liquid mixing was investigated to observe the effect of ratio C, Clearance, and T, diameter tank, with C/T 0.33; C/T 0.25 and C/T 0.17 on local volume of hydrodynamic and spatial distribution of polydisperse solid suspension using CFD, Computational Fluid Dynamics. The 45o pitch blade turbine, diameter 0.5T, with down pumping flow simulation was used to remove solid particle from bottom of the tank. The tank is also equipped with four baffle with the size of 0.1T.. A solid-liquid mixing consists of five fractions of glass beads with equal proportion (X1=X2=X3=X4=X5=0.2X) have 40% wt total solid concentration with liquid fraction is aqueous solution of NaCl. The effect of ratio C/T at impeller speed 612 rpm create a flow pattern in the tank different. Effect ratio C / T also indicated the distribution on solid had a good uniformity index when N≥ Njs, just suspended speed. The highest uniformity was obtained on C/T 0.17. it also made difference power consumption on each geometry with C/T 0.17, 0.25, and 0.33 respectively are 251.18, 238.13, and 270.65watt
Study of Rapid Visual Screening of Buildings for High Potential Seismic Hazard According to Indonesian Standard
Get PDFThis paper presents a study of Rapid Visual Screening (RVS) using FEMA 154 and applied in Indonesia based on SNI 1726. RVS is a method to asses potential earthquake hazard of a building based on visual observation (“sidewalk survey”) of the exterior and interior building if possible, and a Data Collection Form. This study is intended to see how important the RVS of the FEMA 154 can be implemented in Indonesia with a case study at Yogyakarta. The buildings that reviewed were assumed to have the same parameters as mention in FEMA 154 and compatible with SNI 1726 (Indonesian earthquake map). The results from field survey were compared to the numerical analysis. From the case study, it was found that the administration building of ATK Academy, the dormitory building of Ministry of Internal Affairs, the office building of Department of Agriculture, and the educational building of Health Polytechnics have a score more than 2, and the buildings are also declared safe according to SNI 1726
Viability of Pineapple Leaves as an Alternative Natural Fiber Geotextile
Get PDFThe study focuses on the utilization of pineapple leaves fiber as a raw material for the production of geotextiles. The fiber yarns were weaved based on required size of sample issued by the Philippines Textile Research Institute (PTRI) of the Department of Science and Technology (DOST). The Zwick/Roell Tensile Strength Tester Z050 (CRE) with 50 KN full scale load was used with the Wide-Width Strip Method in order to get the average tensile strength of the specimens each for both pineapple and abaca geotextile samples. The resulting average tensile strength and average nominal thickness for pineapple leaves geo-textile, when compared to abaca geo-textile has higher tensile force for a thinner sample of pineapple leaf geo-textile