Judul: Perbandingan Metode Ordinary Runs dengan Doublet Test untuk Uji Keacakan pada Data Spasial
Abstrak: Many research had been developed to study the spatial distribution pattern. Spatial distribution pattern was divided into three types, which were clustered, dispersed, and random. Spatial distribution pattern could detected with testing the randomness from the data grouping. Two common methods used to detect the spatial distribution method were Ordinary Runs (OR) and Doublet Test (DT). This research objective were to compare the method between Ordinary Runs dan Doublet Test on the simulation data, to study and also to analyze the spatial distribution pattern on the disease case of Citrus Vein Phloem Degeneration (CVPD) for the orange in Balitjestro, Batu. Based on the simulation result, on the random data of DT had the higher accuracy than OR. On the nonrandom data of OR had the higher accuracy than DT. On the real data analysis OR, DT, and Run Test random conclude on the data of CVPD disease attack on the West-East direction. Based on those results, the disease distribution pattern of CVPD was not effected by the wind direction
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Judul: Spatial scan statistic for aids hotspots detection at regencies and municipalities in Java
Abstrak: Scan statistic is a statistical method with many potential applications. It is designed to detect a local excess of events and to test if such an excess can reasonably have occurred by chance. It can be applied on wide area of interest, such as on disease clustering. In this research spatial scan statistic was applied important to detect the locations of the significant hotspot clusters of severe and dangerous disease, AIDS. This research applied the probability distribution generating events of poisson under the null hypothesis, supported by likelihood ratio test analysis to get the statistic test value and a Monte Carlo simulation to obtain the significant hotspot cluster from calculation of those statistic test values in computational process algorithm. Analysis with 19 percents of the population at risk of maximum spatial cluster size and the cilcular spatial window shape, spatial scan statistic presented the significant hotspot clusters of AIDS cases in Java. The places considered as hotspot are the municipalities of Center Jakarta and North Jakarta, Bandung, Malang, Surahaya, Semarang, Yogyakarta, and Salatiga. Based on the fact, government has to provide AIDS eradication and surveillance program in the hotspot area while the program of prevention must be implemented in the surrounding area (non hotspot area).
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Judul: The Addition of Niobium (Nb) to Uranium Zirconium (U-Zr) Alloy for Nuclear Fuel
Abstrak: Pengembangan bahan bakar nuklir merupakan aspek penting dalam teknologi reaktor nuklir, dengan fokus pada keamanan dan ekonomi. Saat ini, reaktor riset G.A. Siwabessy menggunakan bahan bakar uranium silisida (U3Si2/Al) yang memiliki beberapa kekurangan, seperti densitas maksimum 4,80 gU/cm, The development of nuclear fuel is a crucial aspect of nuclear reactor technology, focusing on safety and economics. Currently, the G.A. Siwabessy research reactor uses uranium silicide (U3Si2/Al) fuel, which has drawbacks, such as a maximum density of 4.80 gU/cm
Keyword: zicronium, reactor, niobium, nuclear, ?-uranium