Komputasi Berbasis Dinamika Fluida dalam Prediksi Performa Preduster secara Unsteady State

Preduster merupakan alat berbentuk cyclone yang digunakan dalam memisahkan gas dan padatan. Dalam industri semen, alat ini dipasang untuk memisahkan partikel debu dan udara panas sisa pembakaran dan pemanasan sehingga udara panas tersebut dapat dimanfaatkan kembali sebagai media pra-pemanasan bahan baku maupun media pengering batu bara. Komputasi berbasis dinamika fluida telah digunakan dalam penelitian ini karena mampu menyelesaikan persamaan perpindahan momentum, panas maupun massa. Pemodelan sistem unsteady state menggunakan algoritma Large Eddy Simulation (LES) dengan time step 0,01 selama 10 detik. Pendekatan distribusi partikel yang masuk dalam preduster menggunakan model Lagrangian. Performa preduster dinilai dari efisiensi pemisahan solidnya, pemodelan ini memprediksi efisiensi pemisahan yang terjadi selama 10 detik mencapai 70,9%

Risk Based Milk Pricing Model at Dairy Farmers Level

The milk price from a cooperative institution to farmer does not fully cover the production cost. Though, dairy farmers encounter various risks and uncertainties in conducting their business. The highest risk in milk supply lies in the activities at the farm. This study was designed to formulate a model for calculating milk price at farmer’s level based on risk. Risks that occur on farms include the risk of cow breeding, sanitation, health care, cattle feed management, milking and milk sales. This research used the location of the farm in West Java region. There were five main stages in the preparation of this model, (1) identification and analysis of influential factors, (2) development of a conceptual model, (3) structural analysis and the amount of production costs, (4) model calculation of production cost with risk factors, and (5) risk based milk pricing model. This research built a relationship between risks on smallholder dairy farms with the production costs to be incurred by the farmers. It was also obtained the formulation of risk adjustment factor calculation for the variable costs of production in dairy cattle farm. The difference in production costs with risk and the total production cost without risk was about 8% to 10%. It could be concluded that the basic price of milk proposed based on the research was around IDR 4,250-IDR 4,350/L for 3 to 4 cows ownership. Increasing farmer income was expected to be obtained by entering the value of this risk in the calculation of production costs.

Effect of Addition of Gadolinia Doped Ceria on Theelectrical Properties of Lanthanum Strontium Manganite-yttria Stabilized Zirconia for Solid Oxide Fuelcell Cathode

A research on the effect of adding Gadolinia Doped Ceria (GDC) on the electrical property, in this case is the electronic conductivity of thick film ceramic of Lanthanum Strontium Manganite- Yttria Stabilized Zirconia (LSM-YSZ) used as an Solid Oxide Fuel Cell (SOFC) cathode has been done. Thick film cathode was coated by screen printing method. Compositions for the cathodes were 50 : 50 : 0; 50 : 40 : 10 and 50 : 30 : 20 for LSM, YSZ, and GDC, respectively. X-Ray Diffractometer (XRD) analysis showed that after the addition of GDC, it was known that there were three main phases in the thick film ceramic cathode i.e. LSM, YSZ, and GDC. Moreover, there was a second phase in each composition of thick film ceramic cathode of SrZrO3. Scanning Electron Microscope (SEM) analysis showed that the number of pores and grain size of the LSM part increased qualitatively with increasing concentration of the GDC. Moreover, the electronic conductivity measurement using the Four Point Probe Technique showed that the addition of GDC also increased the electronic conductivity from 0.00406 S/cm to 1.082 S/cm at temperature of 600 oC

Dampak Aplikasi Fungsisida Perlakuan Benih Jagung Terhadap Kelimpahan Nematoda dan Artropoda Tanah

The objectives of this research were to study the effect of application of fungicide as a seed treatment of corn on soil nematodes and arthropods. The fungicide test as seed treatment with dosage of 5 g in 1  kg of corn seed. Four corns that were planted in polybag with capacity 5 kg of soil were set as experimental unit, and they were arrange in randomize block experimental designed with 3 block as replications. The treatments of this experiment were four fungicides with different active ingredient namely Fenamidone, Metalaxsil, Propiconazole, and Dimethomorph and one check with no fungicide. Disturb soil samples for nematode extraction and undisturb soil in ring soil sampler for arthropod extraction were taken from the polybag when corn was 40 days old after planting. Nematodes were extracted by sieving and centrifugation with sugar solution methods, while arthropods were extracted by Berlese funnel extractor under one week incubation. Nematode was grouped into feeding groups and arthropod into order taxonomyc groups. The analysis of variance procedure was applied to the data of nematodes and arthropods abundance and their mean difference was test by Least Significant Difference (LSD) with 5% of significantly level. The results showed that the effect of fungicide application as a seed treatment of corn was varied.  Application of Metalaxil and Propiconazole tend to suppress the abundance of plant parasitic nematodes, but not for the free living groups, while the other fungicides test was not significantly affected to both of plant parasitic and free living nematodes groups. All of test fungicides were significantly suppress the abundance of Acarina, but not for Collembola and others arthropods abundance.   Key words: seed treatment, corn, soil organism Â

Unravelling the genetic basis of Fusarium resistance in different maize populations

Fungal infection by Fusarium verticillioides is cause of substantial reductions in maize yield and grain quality worldwide. Developing natural resistance in maize genotypes is an effective way to achieve sustainable control of F. verticillioides in the field, and breeding for resistance may be accelerated by identifying genes and loci responsible for natural disease resistance. Significant advances have been made in the development of transcriptomic, genetic and genomic information for maize, F. verticillioides moulds, and their interactions over recent years. Several quantitative trait loci (QTL) and single-nucleotide polymorphism markers for resistance to Fusarium deriving from QTL mapping and genome-wide association studies have been described in three different maize populations: 1. Bi-parental population; 2. Association mapping panel; 3. Multi-parent Advanced Generation Inter Crosses (MAGIC). To guide the identification of candidate genes within the identified QTL, transcriptomic and sequencing information have been exploited. Promising candidate genes associated with disease resistance and pathogen related-mechanisms at the Fusarium resistant loci have been identified on maize chromosomes 4, 5 and 7. Many of the identified candidates genes offer hints to key metabolic pathways that may have a significant effect on reducing Fusarium infection. Measuring Fusarium resistance in open field could confirm and support their direct use in maize breeding either through crosses or genome editing approaches

Pengaruh Kepribadian, Orientasi Kerja, dan Penempatan terhadap Kinerja Pegawai

Employee performance is one of the things that is very interesting to develop, because employee performance is crucial in determining the performance of partnerships. The purpose of this study was to analyze the effect on employee performance, encourage work on employee performance, placement on employee performance, and personality, encourage work, and placement on employee performance. This research uses quantitative methods. The population of this research is 50 employees of PT. Asuransi Kredit Indonesia Cabang Batam. The research sample of 50 employees, with census sampling technique. The analysis technique uses multiple linear regression. The results of this study indicate that there is no significant difference in employee performance, work planning is significant on employee performance, and placement is not significant on employee performance, and competence, encouraging work, and significant placement on employee performance

Pembelajaran Matematika melalui Pendekatan Open-Ended terhadap Pemahaman Matematik Siswa MTs

Penelitian ini dilatarbelakangi oleh masih rendahnya kemampuan pemahaman konsep matematik siswa Madrasah Tsanawiyah (MTs) swasta di Kota Cimahi sehingga diperlukan pendekatan pembelajaran untuk mengatasi masalah tersebut. Alternatif pendekatan yang diterapkan yaitu dengan pendekatan Open-Ended. Penelitian ini bertujuan untuk menelaah dan mengetahui apakah terdapat pencapaian dan peningkatan kemampuan pemahaman konsep matematik siswa MTs yang pembelajarannya menggunakan pendekatan Open-Ended. Metode penelitian yang digunakan adalah kuasi eksperimen. Pada awal dan akhir pembelajaran, siswa diberikan tes. Populasi dalam penelitian ini adalah seluruh siswa kelas VIII MTs swasta dengan subjek sampelnya adalah siswa kelas VIII di salah satu MTs swasta di Kota Cimahi dengan jumlah siswa sebanyak 24 orang. Pengumpulan data dalam peneltian ini berupa tes sebanyak 5 soal uraian, kemudian data skor kemampuan pemahaman matematik tersebut dianalisis dengan deskriptif dan inferensial dengan menggunakan uji perbedaan dua rata-rata. Berdasarkan hasil penelitian, baik dari hasil analisis maupun pengujian hipotesis, maka peneliti dapat menyimpulkan bahwa terdapat peningkatan kemampuan pemahaman konsep matematik siswa MTs melalui pendekatan Open-ended dan terdapat pencapai kemampuan pemahaman konsep matematik siswa MTs melalui pendekatan Open-ended