Judul: Sintesis BaTiO3 dari Campuran Ba(OH)2 dan TiO2 dengan Tambahan PbO
Abstrak: Piezoelectric material can generate electric field in response to applied mechanical stress. Conversely, they can stretch and contract in response to an electric field. This material can be used for many applications such as transducer, microphone, ultrasound, and pressure gauge. Barium titanate is a ferroelectric material with piezoelectric properties that can be synthesized easily. The aim of this study is to synthesis barium titanate from mixture of Ba(OH)2 and TiO2, also observe its optimum temperature and the effect of PbO addition. The method of synthesis was solid-state reaction and sol-gel method, then the products were characterized with x-ray diffraction (XRD). Based on XRD analysis, the optimum temperature for both methods was 800°C. Addition of PbO to BaTiO3 in the solid-state reaction formed a compound with formula of Ba1-xPbxTiO3. The addition has changed diffraction pattern peak at 2θ and strengthened its tetragonal structure. The best result was obtained at x of 0.5 which will form a compound of Ba0.5Pb0.5TiO3.
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Judul: Sintesis BaTiO3 dari BaCl2 dan TiCl4 dengan Metode Hidrotermal
Abstrak: Increasing technology has lead to proliferating electronic equipments. One component of electronic equipment is capacitor, which can be made of barium titanate (BaTiO3). This study aims to synthesize and to characterize BaTiO3 from a mixture of BaCl2 and TiCl4 by observing changes in temperature and the stage of the reaction. This study was carried out in several stages, i.e synthesis of BaTiO3 by hydrothermal method, changes in the reaction steps, changes in pH, compared the results by nonhydrothermal method and characterization by X-ray diffraction (XRD). Based on XRD results, synthesis of BaTiO3, using the method of hydrothermal (T = 120-150 °C), changes in the reaction steps, also in pH, had not been able to produced pure BaTiO3. It can be seen from low intensity of BaTiO3 and presence of other impurities in the form of TiO2 as can be found in all methods including non-hydrothermal method (T = 600 °C).
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Judul: Prevalensi dan Faktor Risiko Infeksi Cacing Saluran Pencernaan pada Kuda Delman di Kota Bogor
Abstrak: Kuda (Equus caballus atau Equus ferus caballus) merupakan spesies mamalia modern dari genus Equus. Kuda di Indonesia sering digunakan sebagai alat angkut atau transportasi. Performa kuda dalam bekerja dipengaruhi oleh faktor kesehatan. Satu di antara masalah utama yang dapat mengganggu kesehatan kuda adalah kecacingan. Penelitian ini bertujuan menduga prevalensi dan mengidentifikasi faktor-faktor risiko kejadian infeksi cacing saluran pencernaan pada kuda delman di Kota Bogor. Metode penelitian ini yaitu studi cross-sectional, menggunakan dua jenis data berupa hasil pemeriksaan laboratorium sampel feses dan hasil wawancara terhadap kusir delman menggunakan kuesioner terstruktur. Data dianalisis menggunakan pendugaan rataan derajat infeksi cacing dan proporsi kuda yang terinfeksi serta pendugaan nilai risiko relatif (RR). Hasil penelitian 20 sampel feses menunjukkan bahwa prevalensi Strongyle sebesar 60%. Berdasarkan hasil identifikasi larva, jenis Strongyle terdiri atas Cyathostominae 73% (Cyathostominae tipe A 61%, tipe G 6%, tipe C 4%, tipe F 1%, dan tipe H 1%), Strongylus vulgaris 22%, S. equinus 3%, serta S. edentatus 2%. Derajat infeksi Strongyle termasuk kategori infeksi ringan dengan jumlah 282.5 telur tiap gram tinja (TTGT). Faktor risiko yang mempunyai hubungan terhadap kejadian infeksi Strongyle yaitu umur kuda, kepadatan populasi, jenis kandang dan pakan kuda, lokasi dan cara pemotongan rumput, higiene kuda, serta sanitasi. Perbaikan manajemen pemeliharaan kuda perlu dilakukan oleh para pemilik kuda untuk menurunkan kejadian infeksi cacing saluran pencernaan.
Keyword: Cyathostominae, faktor, kuda, prevalensi, Strongyle