Reza Kurniawan Saputra, Brilliant Aditya Fhandy, Aditya Rio Prabowo, Quang Thang Do, Budi Santoso and Nurul Muhayat
The high rate of ship casualties demands serious attention. Earlier studies have yet to integrate several scenarios in an experiment. This research aims to determine damage to a…
Abstract
Purpose
The high rate of ship casualties demands serious attention. Earlier studies have yet to integrate several scenarios in an experiment. This research aims to determine damage to a ship's hull that is assumed to have been stranded due to being hit by a rock under the sea.
Design/methodology/approach
This scenario was analyzed by conducting a penetration test simulation using the ANSYS LS DYNA. Modeling was carried out with core, speed, indenter shape and indenter angle variations. The test is carried out by moving the indenter against the plate until the plate is damaged.
Findings
The results of this research show that the round indenter gave the best results in testing, while changes in speed below 1.5 m/s did not significantly affect the results. The contact angle of the indenter to the panel is directly proportional to the damage to the panel, and core X has the best results in the test.
Originality/value
This work presented several proposed eccentric sandwich panels to calculate their performance against impact loading. The detailed geometry for future reference is presented, while the indenter-panel interactions are validated based on experimental work.
Details
Keywords
Dandun Mahesa Prabowoputra, Aditya Rio Prabowo, Syamsul Hadi and Jung Min Sohn
In Southeast Asia, the renewable energy produced from hydropower systems has significant potential. Therefore, adequate development is needed to prevent future energy-related…
Abstract
Purpose
In Southeast Asia, the renewable energy produced from hydropower systems has significant potential. Therefore, adequate development is needed to prevent future energy-related crises. This study, therefore, aims to determine the variations effects in geometry and the geometrical factors on turbine performance.
Design/methodology/approach
The developed aspects are selected to determine the blade shape, its number and multistage requirements. The study was conducted in 3D simulation, with Ansys software used to calculate a series of computational fluid dynamic problems. The aspect ratio applied in this study utilized the ratio of the overall diameter of the rotor height (D / H), which is 1.
Findings
The results showed that the highest Cp-max value, number of blades and stages were 0.2, two and three, respectively. Furthermore, these attributes combined to improve the performance of hydroturbines.
Research limitations/implications
The research was fully conducted using numerical simulation, which requires sustainable research in the form of laboratory experiments. Also, pioneer experiments were conducted using benchmarking to ensure the results obtained are reliable.
Practical implications
Hydropower is one of the best renewable energy sources in Indonesia with a large potential in the archipelago and tropical countries due to rivers and various water sources. The current generated is a useful reference for Savonius design.
Originality/value
The originality of this study is to examine the three aspects of the geometry of the rotor, such as the number and shape of blades, as well as the stages in the same boundary conditions. Therefore, the comparison of the effects of changes in geometry on turbine performance is more acceptable and complete compared to the pioneer works, which focused on a parameter. This research combines several aspects to determine the effect of rivers and various water sources on the hydroturbine.
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Keywords
Ahmad Izudin, Muh Isnanto, Dandung Budi Yuwono and B.J. Sujibto
This study aims to revisit the practice of multiculturalism within the co-existence of halal food products in non-Muslim communities in Kupang, East Nusa Tenggara, Indonesia.
Abstract
Purpose
This study aims to revisit the practice of multiculturalism within the co-existence of halal food products in non-Muslim communities in Kupang, East Nusa Tenggara, Indonesia.
Design/methodology/approach
Data were collected through observations, interviews and documentation using a case study approach.
Findings
The important findings in the existing study indicate that social practice related to the acceptance and expression of non-Muslim communities towards halal products and certificates is integrated into the daily life of the people. It has contrasted with other regions in Indonesia where debates between cultural and structural aspects of halal product studies and certification prevail, often dominated by ego-sectoral interests and Islamic theology. Although Kupang’s predominantly non-Muslim population, the practice and model of halal products emerge with uniqueness within communal traditions and socio-cultural practices take precedence over structural factors.
Research limitations/implications
The most significant contribution of this research lies in mutual understanding, interfaith dialogue and religiosity that have fused into social life, specially building social coexistence in halal products.
Practical implications
These findings contribute to policymakers to reformulate halal certification and products, which are not solely driven by the interests of the Muslim community.
Originality/value
This study presents a new synthetic theory about halal products, confirming a case study in Kupang where non-Muslim communities accepted halal products as a reflection of cultural and local customs. This acceptance has led to the development of a new identity without contradictions among business interests, ideologies, sectoral aspects, hygiene, health and structural state movements.