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: Comparative analysis of classification methods based Regioclassification Autocorrelation (ACRC) and Non-ACRC for spatial data
Abstrak: Many methods are available for classification of data including spatial data. This makes it difficult to determine which method is best used to classify a set of data. Each method has advantages and disadvantages in classification. This study aims to determine which method is a good classification method is used for spatial data. The method used in this study include natural breaks, quantile, equal interval, geometrical interval, and standard deviation found in ArcGIS. In addition, to compare we also use Autocorrelation based Regioclassification (ACRC). This method has the aspect of the outlier neighbors. Testing to determine the best between the two methods uses Goodness of Variance Fit (GVF) of each method. The results of this study indicate that ACRC is an excellent method used mainly by GVF value of 0.924., Banyak metode untuk pengklasifikasian data termasuk untuk data spasial. Hal ini membuat kesulitan untuk menentukan metode mana yang baik digunakan untuk klasifikasi sekumpulan data. Masing-masing metode memiliki kelebihan dan kekurangan dalam pengklasifikasian. Penelitian ini bertujuan untuk menentukan metode klasifikasi mana yang baik digunakan untuk data spasial. Metode yang digunakan dalam penelitian ini antara lain adalah natural breaks, quantile, equal interval, geometrical interval, dan standar deviasi yang terdapat dalam ArcGIS. Selain itu, untuk membandingkan digunakan juga Autocorrelation based Regioclassification (ACRC). Metode ini memerhatikan aspek tetangga sehingga terdapat outlier. Pengujian untuk menentukan yang terbaik antara kedua metode tersebut menggunakan Goodness of Variance Fit (GVF) dari masing-masing metode. Hasil dari penelitian ini menunjukkan ACRC merupakan metode yang baik digunakan dengan nilai GVF sebesar 0.924.
Keyword: ACRC, ArcGIS, data spasial, GVF

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