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ANALISIS BURN UP PADA HYDRIDE MICROREACTOR DENGAN BAHAN BAKAR LOW ENRICHED URANIUM (LEU) MENGGUNAKAN PROGRAM OPENMC
No full textHydride Microreactor merupakan salah satu jenis reaktor mikro dengan kapasitas daya sebesar 1 MWt yang menggunakan bahan bakar UH3 bertipe low enrichment uranium (LEU). Penelitian ini akan melakukan analisis terhadap burn up reaktor dengan variasi pengayaan bahan bakar LEU yang digunakan. Model desain Hydrid Microreactor disusun pada kode simulasi OpenMC untuk melakukan simulasi depelsi bahan bakar. Simulasi deplesi bahan bakar dilakukan selama 15 tahun dengan keadaan all rods out dengan variasi pengayaan 11%, 12%, dan 13%. Analisis dilakukan dengan mengamati perubahan nilai keff, jumlah isotop penting dalam bahan bakar, nilai fuel temperature coefficient (FTC), dan conversion ratio (CR) selama periode burn up pada setiap variasi pengayaan serta dipilih variasi pengayaan yang paling optimal. Nilai keff pada variasi pengayaan 11%, 12%, dan 13% mengalami penurunan sembari bertambahnya periode burn up reaktor dengan nilai pada EOL sebesar 1,01929447; 1,04235614; dan 1,04928991 dengan nilai burn up 9,0236 MWd/kg. Kemudian nilai fuel temperature coefficient (FTC) pada variasi pengayaan 11%, 12%, dan 13 % secara berurutan adalah -4,552 pcm/K; -4,341 pcm/K; dan -4,246 pcm/K. Untuk nilai conversion ratio (CR) ketiga variasi secara berurutan pada BOL adalah 0,38689957; 0.36932039, dan 0.35352262. Sedangkan pada EOL adalah 0,41961583; 0,39956525; dan 0,38042059. Diperoleh variasi pengayaan yang optimal sebesar 11%
Denying the accusation of plagiarism: power relations at play in dictating plagiarism as academic misconduct
No full textIn academia, plagiarism is considered detrimental to the advancement of sciences, and the plagiarists can be charged with sanctions. However, the plagiarism cases involving three rectors of universities in Indonesia stand out, as they could defend their stand for not committing academic misconduct despite evidence found. By analyzing the three rectors' cases, the present study aims to answer how power relations take a role in plagiarism discourse in Indonesia, particularly in determining what is considered academic misconduct and what is not. By employing critical discourse analysis, we found that when the accusation of plagiarism appears during rectorial elections, the accused could equivocate that the accusation was meant to undermine them as a political opponent. When the accused plagiarists win the election, they have more power to deny and tackle the accusations of plagiarism. The findings indicate that plagiarism issues can be politicized, in which by those in power it can be used as a tool to undermine their political opponents, whereas the accused plagiarists can claim that the actual problem is personal and not about plagiarism. It is also shown that in the real context, whether something is called plagiarism or not is subject to interpretation by those in power
Changes in the forming aspects of the public service bargains components in determining the general budget policy
No full textPublic Service Bargains (PSB) perspective is used to analyze the relationship between politicians and bureaucrats based on the roles of both parties. This study aims to discuss how the relationship between politicians and bureaucrats and their interactions in two periods of leadership with different backgrounds, to analyze what aspects of interaction, behavior and power are in the PSB framework, particularly in determining budget policy in general. Discussions about governance and leadership as well as the interaction of politicians and bureaucrats are presented based on information and data obtained from primary data sources through in-depth interviews with bureaucratic leaders, that are the Mayor, Chairman of the Regional Representative Council (DPRD) as legislative bodies, Regional Secretary, and other supporting informants. The qualitative method is processed using NVIVO 12. The main findings in this study are aspects of interaction, behavior and power in two leadership eras with different backgrounds, so that this relationship pattern can be used as a reference in analyzing the relationship between bureaucrats and politicians in the PSB framework. The results of this study can be implemented in determining policies, in this case the general budget determination policy in the City of Magelang. © 2023 Author(s)
Cryptocurrency: Highlighting the Approach, Regulations, and Protection in Indonesia and European Union
No full textThe speed of the adoption and use of cryptocurrency that utilizes blockchain technology as its central infrastructure is expanding globally, including in Indonesia. It has promising prospects as a future asset and payment instrument. However, the regulations in Indonesia are often delayed and inadequate for dealing with cryptocurrency's developments. This research is intended to analyze the approaches, regulations, and protection of the use of cryptocurrency. This study argues that the regulatory approach to using cryptocurrency is balanced, while Indonesia has a partial status in cryptocurrency legality. The government's protection of cryptocurrency investors is adequate in using cryptocurrency as a commodity traded on futures exchanges with a license from Bappebti. A progressive policy for establishing the Digital Asset Law by the government is important due to the resultant clarity in the regulatory status of cryptocurrency will allow the ecosystem to grow and promote innovation, thus harnessing the benefits of cryptocurrency while mitigating related risks
Social Media in Support of Indonesia's One Data Interoperability Process for Implementing Data Governance Policies
No full textThis study aims to determine whether Twitter is a social media platform that supports the One Data Indonesia Interoperability process to implement data regulations by producing accurate, integrated and accountable data. Use of Social media in Participation, Transparency, Discussion, involvement, and Communication Strategy. This descriptive research uses NVivo 12 Plus with data sources from Twitter @diklat BIG, @datagoid, @bappenasRI, and @Jokowi via NCapture. NCapture data and use the automatically configured crosstab feature. This study shows that social media significantly drives data interoperability strategies in Indonesia. Communication indicators from Participation in previous attempts were 22.00 and 3236 referrals. The 21.00 transparency category includes clear objectives, processes and program support. They completed 20.00 of the various stages of data collection, verification, and data priority release. To socialize the implementation of One Data Indonesia and the action to accelerate the provision of the One Data Portal, tweets were used with an involvement proportion of 18.00. Communication Strategy realizes the importance of data and the existence of One Data Indonesia by using the Conversation Indicator, which has a Participation proportion of 17.00. This study is essential for analyzing social media assistance using Twitter-based activity support and providing new, up-to-date data with NVivo 12 Plus analysis. © The Authors, published by EDP Sciences
Analisis Tebal Shielding HotCell untuk Dismantling Limbah Radioaktif Aktivitas Tinggi dengan Microshield7
No full textAnalisis Tebal Shielding HotCell untuk Dismantling Limbah Radioaktif Sumber Bekas Aktivitas Tinggi dengan MicroShield 7” di IPLR - DPFK bertujuan untuk menentukan material yang paling efektif sebagai perisai tambahan untuk fasilitas ruang hotcell yang sedang dioprasikan untuk mengolah sumber berbentuk silinder berupa Cobalt-60. Dengan bantuan dari Microshield 7, diperoleh data hasil simulasi mengenai dosis paparan radiasi yang diterima pekerja radiasi pada beberapa jarak tertentu dari ruangan hotcell. Semakin tebal ketebalan material perisai dan semakin jauh jarak pekerja radiasi dari hotcell maka paparan yang diterima akan semakin berkurang. Penulis menganalisis variasi material yang paling efektif dan cocok digunakan sebagai perisai tambahan untuk ruang hotcell. Material yang paling efektif dan cocok digunakan adalah beton berdensitas tinggi (3.2 g/cc). Hal ini dikarenakan jika menggunakan material ini, pekerja radiasi pada jarak terdekat akan menerima paparan yang cukup rendah di bawah 100 μSv/h. Selain karena efektif sebagai perisai radiasi, bahan material ini cukup murah dan mudah didapatkan di Indonesia
Joint Angular-Frequency Power Spectrum Sensing Based on K-Means Clustering
No full textThe critical component in the cognitive radio (CR) network is spectrum sensing (SS) used to locate the accessible spectrum and to minimize interference with the licensed users (LUs). The CR SS could take into account the direction-of-arrival (DoA) of signals sent by LUs from the perspective of a secondary user (SU) to further improve the spectrum utility. This prevents the SU to interfere the LU signals by occupying a frequency band that the LU is currently using but aiming its transmission at a specific angle away from the LU. We use a uniform linear array, sample the signal received by each antenna, compute the correlation between samples, apply classical beamforming, and compute the discrete Fourier transform to reconstruct the complete two-dimensional angular-frequency power spectrum. In order to determine whether LUs or other SUs are currently occupying a certain frequency band or not, we use K-means clustering to compute the detection threshold. Numerical studies are carried out to demonstrate that the threshold based on the K-means clustering is applicable to detect signals from LUs based on the result of frequency and DoA power SS
Tree Boosting Methods Comparison for Landslide Susceptibility Maps, Case Study: Kejajar, Wonosobo
No full textLandslides in Indonesia occur almost every year and cause large material losses. Early prevention by creating a landslide susceptibility map is one way to anticipate losses due to landslides. The search for the best method for predicting landslides using machine learning with several tree boosting methods has been carried out, but the comparison between the tree boosting methods is unknown. This study aims to compare the tree boosting methods in their use for creating landslide susceptibility maps. The case study used in this research is Kejajar District, Wonosobo. There are 25 data features used to determine landslide. The landslide data in this study is 84 polygons. The tree boosting methods used include XGBoost, LGBM, Adaboost and Catboost. Hyperparameter tuning and k-fold cross validation were used to get the best model. The results of the comparison show that LGBM is the best method with accuracy, recall, f1 score, and ROC AUC values of 0.9903, 0.9360, 0.9154, and 0.9648 respectively. It indicates that the boosting method using LGBM can provide good results for creating a landslide susceptibility map
Flash Flood Study on Mt. Merapi Slope for Improvement of the Monitoring Method
No full textFlash floods with or without debris in the rivers on the Mt. Merapi slope have been causing damage and loss of lives until now even though a series of sabo dams have been built for each river, and warning systems have been established and operated. This study aims to understand the hydrology and hydraulic characteristics in the area, especially of the two important rivers namely Bebeng and Boyong Rivers for flood monitoring improvement. The research verified the results of previous studies on hydrology and hydraulics of the area, approximating flood travel times using a simple formula stepwise, comparing with the result of the analysis using recorded pair data of a precursor rainfall and the related local peak of water level hydrographs. The reference study results show that the South-West slope of Mt. Merapi has a higher risk for flash flood occurrence. Flood travel time in the short upstream reach is well estimated using the simple formula stepwise because the result is similar to the measured one. Based on pairs of precursor rainfall and the related local peak water level data, the local peak water level weakly influences the time lag for those two AWLR Sta. locations. It is proposed to include the flood propagation time in considering the issuance of warning messages
Flavor precursor formation of non-fermented forastero cocoa beans after flavourzyme® and glucose treatment
No full textThe chocolate flavor determines the quality of cocoa. Efforts have been made to enhance chocolate flavor, apart from fermentation, by adding aroma precursor-forming ingredients such as amino acids and reducing sugars to cocoa nibs. This study aimed to determine the effect of protease from Aspergillus oryzae (Flavourzyme®) and glucose toward flavor precursor formation in non-fermented cocoa nibs. First, the highest Flavourzyme® concentration and the optimal incubation time to hydrolyze protein in non-fermented cocoa nibs were determined. Then, the non-fermented cocoa nibs were treated with Flavourzyme®, glucose, and the combination of both. Afterward, cocoa nibs were dried and tested for their pH, fermentation index, and the contents of reducing sugar and free amino acids. The present results suggested that the highest degree of hydrolysis was obtained from treatment with 50 U/g Flavourzyme® in 8 h of incubation time. Flavourzyme® could reduce the pH of non-fermented cocoa beans to pH 5.8. Cocoa nibs treated with Flavourzyme® and glucose showed higher fermentation index, and reducing sugar content than naturally fermented cocoa nibs. Furthermore, the free hydrophobic amino acids (Tyr, Phe, Leu) were in the highest level. Thus, Flavourzyme® and glucose treatment could enhance the precursor flavor in non-fermented cocoa nibs. © 202