Judul: Sintesis dan Karakterisasi Sifat Magnetik dan Listrik Komposit Film Berbasis Fe-Filled Multiwalled Nanotube Carbon
Abstrak: Research and development have synthesis and characterization of magnetic and electrical properties of composite films based on Fe-Filled Multiwalled Carbon Nanotubes (MWNT) with the Simple Mixing method. In this study used MWNT and Fe-MWNT from the last research. MWNT mixed with PVA and PVA mixed with Fe-MWNT, and then do evaporation process where composite is allowed to stand for 2 days at the temperature room until finally forming a thin film. Analysis of X-Ray Diffractometer shows that the addition of MWNT and Fe-MWNT will enhance the conductivity from the number of broad grain size. Morphological structure of PVA/MWNT and PVA/Fe-MWNT also obvious by using Scanning Electron Microscopy. LCR analysis showed that PVA/MWNT are insulators and PVA/Fe-MWNT are conductors. As for the magnetic properties of PVA/MWNT is diamagnetic and PVA/Fe-MWNT is paramagnetic test results with Vibrating Sample Magnetometer.
Keyword: electrical properties, Fe-MWNT, magnetic properties, MWWNT, PVA

Judul: Fabrikasi dan Optimasi Sifat Fisis Film Nanokomposit NiFe2O4- Multiwalled Nanotube/PVA
Abstrak: Fabrication and characterization of NiFe2O4-MWNT/PVA nanocomposite film has been conducted. NiFe2O4-MWNT as a filler of nanocomposite film were gained using simple mixing method from solution containing Fe(NO3)3.9H2O, Ni(NO3) 2.6H2O and MWNT. The filler was mixed with Polyvinyl Alcohol (PVA) with some various concentrations and dried in room temperature for 24 hours. X-Ray Diffraction (XRD) analysis were used to determine the presence and the crystal size of NiFe2O4, LCR meter were used to determine the conductivity of each sample while VSM characterization were used to determine the magnetic properties of each samples. Analyses of XRD showed that the phase of NiFe2O4 were begin to formed especially in sample D (2.5 ml filler and 2.5 ml PVA). Based on electrical propeties using LCR meter, as increasing the consentration of the filler in nanocomposite film will also increase the conductivity of all sample, sample D has the biggest conductivity (1.92 x 10-6 S/cm) whereas based on M-H hysterisis graph from VSM characterization known that the addition of the filler can change the magnetic properties of each samples became paramagnetics.
Keyword: Crystal size,, Physical properties, NiFe2O4-MWNT/PVA, Nanocomposite

Judul: Breeding Season pada ternak domba
Abstrak: Breeding season merupakan suatu musim dalam suatu tahun dimana suatu jenis hewan menampakkan aktivitas perkawinan. Dalam periode satu musim, hewan betina jenis tertentu baik yang telah dewasa maupun yang baru mencapai pubertas memperlihatkan gejala berahi. Jika alat kelamin reproduksi domba betina sudah mulai berfungsi maka akan terlihat timbulnya gejala-gejala berahi, hal ini merupakan indikasi bahwa domba betina sudah siap untuk melakukan perkembangbiakan, tetapi para ahli mengatakan bahwa saat yang demikian belum dianjurkan untuk dikawinkan, oleh karena itu untuk mendapatkan efisiensi reproduksi yang baik, biasanya domba betina baru dikawinkan pada umur 12 sampai dengan 18 bulan, sedangkan untuk domba yang hidup di daerah subtropis dan di daerah dingin dianjurkan pada umur 12 sampai dengan 24 bulan. Periode berahi berlangsung selama 24-48 jam atau 30-36 jam, sedangkan ovulasi terjadi 12-24 jam sebelum berahi berakhir atau 12-41 jam setelah dimulainya periode berahi, dan waktu optimum untuk dikawinkan 18-24 jam sesu- dah permulaan estrus. ...
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