Analysis Loading Height of HTR (High Temperature Reactor) Core to Obtain Criticlity of Reactor

High temperatur reactor (HTR) attract to be studied due to it has inherent safety characteristics and capabilities to produce energy economically. Design of reactor core in this study is a blend HTR 10 in China with HTR pebble-bed. The reactor has thermal power of 10 MW with inlet and outlet helium temperatures of 250oC and 700oC. HTR design is a cylindrical with helium gas as a coolant and graphite as a moderator. The HTR uses pebble-bed fuel composed a large amount of particles of TRISO in graphite metrics. Kernel radius used to analyse reactor core height in this research is 225 µm with enrichment of 16% in order to achieve critical condition. Reactor criticality is also influenced by the height of active reactor core where pebble-bed fuel is distributed. Calculation of the reactor criticality at any height variations active core is done with MCNP5 modelling techniques. The modelling is done by making the geometry of reactor and pebble-bed which is distributed by using body-centred cubic lattice in the reactor core. From the MCNP5 calculation, the first criticality of HTR can be achieved on the active core height of 150.9012 cm calculated from the bottom active core with criticality value of 1.00312±0.00090. The higher active reactor core is, the more increasing the reactor criticality is. This is occured due to there are many fuel balls of pebble-bed used, so that activity of fission in reactor increases. However, reactor criticality is still in stable condition in each the rise of active core height from critical core height even though reactor reactivity increases 0.01 Δk/k. The minimum of fuel needed to achieve initial criticality (critical core height) is 11,805 pebbles and 8,906 moderators

Studi Evaluatif Implementasi Standar Pelayanan Minimal (Spm) Pendidikan Dasar di Kabupaten Bantul

This research aimed to evaluate the implementation of Basic Education Minimum Service Standards (MSS) in Bantul District. The result were the description of 27 achievement indicators of Basic Education Minimum Service Standards (MSS) and the report of result evaluation implementation. The research method used quantitative and qualitative research, with the evaluation research type. The evaluation model used Robert E. Stake\u27s Countenance Evaluation Model which includes Antecedent (Context), Transaction (process), and Outcome (outcome) evaluation, while data analysis technique in this research is quantitative descriptive and qualitative analysis technique. The results showed that 27 of Achievement Indicators (AI) of Basic Education Minimum Service Standard (MSS) slightly increased on some indicators from the previous year. Description of the results of the study were: 1) for the level of elementary / MI level, AI 1-14 that has been fulfilled 100% that is AI 1, 12, and 13, while AI 15-27 has been fulfilled 100% that is AI 20 and 21; 2) for junior high school / MTs, AI 1-14 that has been fulfilled 100% that is AI 1, 12, and 13, while AI 15-27 that has been fulfilled 100% that have been reached was 100% such as 20 AI; 3) to reach the MSS achievement gap, the roadmap for fulfilling the Minimum Service Standard for Basic Education in 2017-2018

Bond Rating dan Pengaruhnya terhadap Laporan Keuangan

Penelitian ini bertujuan untuk mengetahui hubungan antara bond rating denganbeberapa rasio keuangan, yaitu rasio : time interest earned ratio, debt to total assetratio, current ratio, cash flow to debt ratio, quick ratio, operating profit margin, returnon asset, total asset turn over. Penelitian ini dilakukan terhadap 38 Perusahaan gopublic yang listing di PT.PEFINDO pada tahun 2007 dan 2008. Pengambilan sampeldilakukan dengan menggunakan purposive sampling method. Pengolahan dananalisis data menggunakan analisis regresi linear berganda, yang meliputi ujinormalitas data, uji asumsi klasik dan uji hipotesis. Hasil uji hipotesis menunjukkanbahwa time interest earned ratio dan total asset turn over memiliki pengaruhterhadap bond rating. Sedangkan current ratio, quick ratio, return on asset, casf flowto debt ratio, debt to total asset ratio, dan operating profit margin tidak berpengaruhterhadap bond rating

Growth Improvement of Mung Bean (Vigna Radiata (L.) Wilczek R.) by Application of Mycofer and Phosphate Fertilizer

The objective of the research was to observe the effect of mycofer inoculation and the phosphate fertilizer on growth improvement of mung bean (Vigna radiata (L.) R. Wilczek). The research method used experimental method, which used randomize block design 2 x 7 factorial with 3 replications. The first factor was mycofer inoculation (M), which consisted of two levels, i.e. without mycofer inoculation (m0) and with mycofer inoculation (m1). The second factor was adding of phosphate fertilizer (P), which consisted of seven levels of doses, i.e. without adding of phosphate fertilizer (p0), 25 kg/ha (p1), 50 kg/ha (p2), 75 kg/ha (p3), 100 kg/ha (p4), 125 kg/ha (p5) and 150 kg/ha (p6). The observation parameter included the plant height, the leaf area, the dry weight, the number of pods, the seeds weight and the percentages of the root infection. The result showed that there was interaction between mycofer inoculation and the adding phosphate fertilizer to increase the plant height, the number of pods and the seeds weight. Phosphate fertilizer dose 75 kg/ha (p3) was the best dose for increasing the growth of mung bean plants inoculated mycofer on all parameters observed, except best phosphate fertilizers dose for the parameters of dry weight was 50 kg[1] / ha (p2)

Meningkatkan Perkembangan Berbicara Anak Melalui Bercerita Menggunakan Flannel Boards

Tujuan penelitian ini adalah untuk mengetahui perkembangan kemampuan berbicara anak dan mengetahui penerapan pembelajaran dengan metode bercerita menggunakan media papan flanel, dan mengetahui apakah pembelajaran menggunakan media papan flanel dapat meningkatkan perkembangan berbicara anak usia 4-5 tahun di TK Asy-Syifa. Metode penelitian ini adalah penelitian tindakan kelas. Model tindakan yang digunakan adalah sesuai dengan model Kemmis dan Mc Taggart di mana setiap siklus terdiri dari empat langkah dan tiga pertemuan: perencanaan, pelaksanaan, observasi, dan refleksi, yang terdiri dari hari pertama, hari kedua dan hari ketiga. Teknik pengumpulan data yang digunakan adalah lembar observasi, catatan lapangan dan dokumentasi. Hasil penelitian menunjukkan pembelajaran dengan menggunakan media papan flanel dengan storytelling dapat meningkatkan perkembangan berbicara anak usia 4-5 tahun. Tindakan pra-siklus menerima 10 (36%), menunjukkan perkembangan bicara anak-anak yang kurang berkembang, setelah diberikan tindakan dalam siklus saya mendapatkan 14 (49%), siklus II mendapatkan 23 (72%) dan pada siklus III mendapatkan 26 (87) %), hasil pada siklus ketiga dianggap telah berhasil, melebihi kriteria penilaian critegmailrion yaitu 75%

Deteksi Efusi Pleura Pada Citra Thorax Mengunakan Jaringan Syaraf Tiruan Propagasi Balik Melalui Ekstraksi Ciri Biner

The research about detection pleural effusion of the thoracic using neural network back propagation by binary feature extraction has been done. A common cause of pleural effusion disease is cancer. It is estimated that pleural effusion Malignant affects 150,000 people every year in the United States. The normal pleural space only has a few milliliters of liquid that helps lubricate of the lungs during breathing. Pleural effusion (large amounts of liquid in the pleural space) can lead to a partial or complete compression of the lung. The difficulty to distinguish excess accumulation of fluid in the pleural cavity should be minimized by radiologist. This research contributes interpretation pleural effusion in the thoracic and reduces doubts of doctor in the treatment of patients. The purpose of this research is to develop algorithms to identify pleural effusion using artificial neural networks back propagation by binary feature extraction the thoracic. Binary feature extraction is obtained from the level set segmentation. The process of image enhancement by histogram equalization and contrast enhancement should be performed before the level set segmentation process. Binary feature extraction patterns were training on ANN was taken from 5% until 25% of costophrenic angle in the thoracic. Neural network can recognize the characteristic patterns of the binary feature 15% are well trained. Validation ANN pattern training by up to 100%, while process of testing the ANN is able to identify 14 data from 15 test data to test validation value reaches 93.33% on the condition of setting 2 hidden layers, each of hidden layer contain 10 neurons

Perhitungan Nilai Dosis dan Kontras Citra Computed Radiography (Cr) dengan Variasi Ketebalan dan Kombinasi Jenis Filter

The research about calculation of dose values and image contrast computed radiography has done with thickness variation and combination type filter. Additional filters are ideal able to absorb all of the energy is low and continuing high energy X-rays. Materials filters are often used in radiodiagnostic is Aluminum (Al). This researc used material such aluminum (Al), stainless steel (Ss), Zinc (Zn) and combine the filter to get low dose withhigh contrast quality.The thickness of the filter are 0.5 mm, 1 mm, 1.5 mm, 2 mm of the three types of filter material with maximum combination thickness of the filter material is 2 mm. Irradiation performed with a Shimadzu brand X plane by a factor of 3.55 eksposi 50 kVp and mAs with an area of 15 x 15 cm field using the object stepwedge. Dose measurements performed with the detector R100B while the contrast of the image is determined by calculating the gray value of image by using the technique of ROI (Region of Interest) on any object thickness stepwedge.Measurement of dose and image contrast value obtained some filters that generate a low dose with high image contrast. The use of one type of filter that produces low-dose and high image contrast are on filters Al 0.5 mm, Al 1 mm, Al 1.5 mm, Al 2 mm, Zn 0.5 mm, Zn 1 mm, Ss 0.5 mm. While the use of a combination of the type of filter that produces a low-dose and high image contrast value are on 0.5 mm Al + Zn 0.5 mm, 1 mm Al + Zn 0.5 mm, 0.5 mm Al + 0.5 mm Ss, 1.5 mm Al + Zn 0.5 mm, 1.5 mm Al + 0.5 mm Ss and Ss 0.5 mm + 0.5 mm Zn. By combining this type of filter then obtained a lower dose compared with only one type of filter material