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 Bahan Piezoelektrik Ba0.5Na0.5TiO3 – BaTiO3 dan Penambahan Gd2O3 dengan Metode Solid State Reaction
Abstrak: The synthesis of lead – free piezoelectric BNT – BT and addition Gd2O3 have done using solid state reaction. Synthesis of BNT – BT get a perovskite struktur with variation of % mol BT 3%, 7%, 12%. Diffraction pattern of 7% BT showed two peak ((002) and (200)) overlapping that is indicate transformation of phase from rhombohedral to tetragonal (MPB). Synthesis BNT – BT with addition Gd2O3 also a get perovskite struktur with variation of % weight Gd2O3 0.4%, 0.7%, 1%, 3%, 6%. Diffraction pattern of 0.4% Gd2O3 showed overlapping peak. At this komposition happen phase change from rhombohedral to tetragonal. At 0.4% - 0.7% komposition happen down significan point of c/a that is indicate in the komposition MPB of BNT – BT – Gd2O3
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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