Found 6 Documents

Paedagogia: Jurnal Pendidikan Vol 5 No 2 (2016): Paedagogia: Jurnal Pendidikan
Publisher : Fakultas tarbiyah dan Ilmu Keguruan Institut Agama Islam Negeri Palu

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The aim of this research is to measure the effect of the application of presentation, Practice, and Production (PPP) of the eleventh year students of MAN 2 Model Palu. This pre-experimental research design took 27 students of the eleventh year students of MAN 2 Model Palu as the sample. They were chosen purposively. The instruments of data collection were observation, interview and oral. The students had limited ability in constructing present continuous tense. It can be seen in the result of mean score of pre-test (1,70). The data analysis showed that the ability of the students in pre-test was 1,70. It means that the speaking ability of the students in pre-test was very low. After the treatment their proficiency improved to be 3,12. It indicated that the speaking ability of the students after the treatment was higher than before the treatment. It means that PPP Method was effective in asking the Eleventh Year Students of Language Program of MAN 2 Model Palu in constructing present continuous tense sentences orally. After conducting the treatment, the researcher found that there was a significant difference between the mean value of the pre-test and post-test. It was proved that t-test value (7,51) was greater than the t-table value (2,05). It means that the use of PPP Method can improve the speaking ability of the Eleventh Year Students of Language Program Class of Man 2 Model Palu.
Paedagogia: Jurnal Pendidikan Vol 5 No 1 (2016): Paedagogia: Jurnal Pendidikan
Publisher : Fakultas tarbiyah dan Ilmu Keguruan Institut Agama Islam Negeri Palu

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This research aims at investigating how to improve the speaking skill at Madrasah Aliyah Negeri 1 Palu through Problem-Based Learning. This research employed Classroom Action Research (CAR) where the subject was 22 students. The researcher and her collaborator collected the data by using observation checklists, field notes, test, and questionnaire. The data were analyzed qualitatively and quantitatively. The results showed that the application of problem-based learning techniques could improve the students’ speaking skill. In cycle 1, there were 10 students successful in speaking test and the rest were not successful. The group achievement was 45, 45% and the mean score was 67, 36%. The researcher continued to cycle 2 because the result of the speaking test in cycle 1 did not meet the criteria of achievement (50%). In cycle 2, the result revealed that there were 18 students who were successful and there were only 4 students who were not successful. The group achievement was 81, 81% and the mean score was 78, 27%. The research has been completed in cycle 2 because the result showed that the criteria of success 50% have been achieved.
H2 EVOLUTION ON LANTHANUM AND CARBON CO-DOPED NATAO3 PHOTOCATALYST Husin, Husni; Mahidin, Mahidin; Zuhra, Zuhra; Hafita, Fikri
Bulletin of Chemical Reaction Engineering & Catalysis 2014: BCREC Volume 9 Issue 2 Year 2014 (SCOPUS Indexed, August 2014)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (15.997 KB) | DOI: 10.9767/bcrec.9.2.5530.81-86


We report a carbon-modify lanthanum doped sodium tantalum oxide powders (La-C-NaTaO3) by sol-gel process. The resultant materials are characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The X ray diffraction of La-C-NaTaO3 show a single phases with a good crystallinity and without any impurity. The samples is exactly indexed as NaTaO3 monoclinic structure with the space group P2/m. The SEM measurements give a smaller particle size of doped NaTaO3 than pure NaTaO3. The effect of dopant on the photocatalytic activity of La-C-NaTaO3 in the photocatalytic of hydrogen generation is studied and compared with pure NaTaO3. The results show that the rate of hydrogen evolution over La-C-NaTaO3 is higher as compared to that of pure NaTaO3. The enhancement of photocatalytic activity of La-C-NaTaO3 nanocrystalline is mainly due to their capability for reducing the electron hole pair recombination. The La-C-dopant is believed to play a key role in the enhancement of photocatalytic properties of La-C-NaTaO3 crystalline.Submitted: 28th September 2013; Revised: 16th February 2014; Accepted: 28th February 2014[How to Cite: Husin, H., Mahidin, M., Zuhra, Z., Hafita, F. (2014). H2 evolution on Lanthanum and Carbon co-doped NaTaO3 Photocatalyst . Bulletin of Chemical Reaction Engineering & Catalysis, 9 (2):81-86. (doi:10.9767/bcrec.9.2.5530.81-86)][Permalink/DOI:] 
Preparasi Katalis Abu Kulit Kerang untuk Transesterifikasi Minyak Nyamplung Menjadi Biodiesel Zuhra, Zuhra; Husin, Husni; Hasfita, Fikri; Rinaldi, Wahyu
Agritech Vol 35, No 1 (2015)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

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Biodiesel, as a potential substituted energy, has attracted a great attention in recent years, which can be produced from o3 renewable sources and provides complete combustion with less gaseous pollutant emission. Biodiesel is produced conventionally via transesterification of vegetable oils using homogeneous catalysts, e.g. KOH, NaOH, and HaSO4. The homogeneous catalytic process, however, provides some disadvantages, such as, a huge production of wastewater from washing process of catalyst residues and non-reusability of the catalysts. In order to circumvent most of the economical and environmental drawbacks of homogeneous process, heterogeneous catalysts, this can be easily separated from reaction mixture by filtration. These catalysts are less corrosive and more environment-friendly. The objective of this work was to develop the effectivity of using waste of cockle (Clinocardium nuttalli) shell as a heterogeneous base catalyst for the biodiesel production. The catalysts were prepared by simple calcination methods, at temperatures of 600, 700, 900 oC, and without calcination. Calcined catalysts were characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) technique. Transesterification process of Calophyllum inophyllum L.oil and o methanol were carried out under bath reactor over the cockle shellcatalysts to produce biodiesel. The XRD patterns depicted that CaCO3 was successfully converted into CaO. SEM recorded demonstrates that the particle catalyst become smaller after heating. The highest activity was found at calcined catalyst of 900 oC, with the yield of biodiesel reaching 87.4% during 3 hours. The solid catalyst from waste cockle shell was proven to be durable for the transesterification of edible oil.ABSTRAKBiodiesel, sebagai sumber energi potensial telah menarik perhatian dalam beberapa tahun terakhir, karena dapat diproduksi dari sumber terbaharukan dan menghasilkan polutan yang rendah. Secara konvensional, biodiesel diproduksi melalui transesterifikasi minyak nabati menggunakan katalis homogen, yaitu: KOH, NaOH, dan H2SO4. Proses katalitik homogen memiliki beberapa kekurangan, seperti: banyak mengeluarkan air buangan dari pencucian residu katalis dan tidak dapat digunakan kembali. Untuk mengatasi kekurangan penggunaan katalis homogen baik secara ekonomi maupun lingkungan ditempuh dengan mengembangkan katalis heterogen atau katalis padat, yang dapat dengan mudah dipisahkan dari campuran reaksi secara filtrasi. Katalis ini juga rendah korosi dan lebih ramah lingkungan. Tujuan dari penelitian ini adalah untuk mengetahui efektivitas penggunaan abu kulit kerang yang mengandung CaO (kalsium oksida) sebagai katalis heterogen terhadap rendemen biodiesel. Bahan baku untuk pembuatan biodiesel adalah minyak nyamplung. Katalis disiapkan dengan metode kalsinasi sederhana pada temperatur: 600, 700, 900 oC, dan tanpa kalsinasi. Setelah kalsinasi, katalis dikarakterisasi denganmetode X-ray Diffraction (XRD) dan Scanning Electron Microscopy (SEM). Reaksi transesterifikasi minyak nyamplung dengan metanol dilangsungkan di dalam reaktor berpengaduk menggunakan katalis padat dari kulit kerang. Dari pola XRD mengindikasikan bahwa CaCO3 terkonversi dari kulit kerang sempurna menjadi CaO ketika kulit kerang dikalsinasi pada suhu 900 oC. Hasil rekaman SEM diperoleh ukuran partikel katalis setelah dipijar menjadi kecil. Aktivitas katalis tertinggi diperoleh pada penggunaan abu kulit kerang yang dikalsinasi pada suhu 900 oC. Rendemenmetil ester tertinggi mencapai 87,4% setelah 3 jam reaksi. Katalis abu kulit kerang telah terbukti dapat digunakan untuk reaksi transesterifikasi minyak nabati menjadi biodiesel.
Karakteristik Membran Asimetris Polietersufone (PES) dengan Pelarut Dimetil Formamide dan N-Metil-2-Pyrolidone - (Characteristic of Poliethersulfone (PES) Asymmetric Membrane with Dimethyl Formamide and N-Methyl Pyrolidone as Solvent) Mulyati, Sri; Razi, Fachrul; Zuhra, Zuhra
Biopropal Industri Vol 8, No 1 (2017)
Publisher : Balai Riset dan Standardisasi Industri Pontianak

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Membrane that is generally used for separation process could be made using phase inversion technique. This research aims to create polyethersulfone (PES) asymmetric membranes via phase inversion technique using solvent and Trans Membrane Pressure (TMP) as variable. SEM analysis indicated that membranes had asymmetric structure that consits of two layers which denser skin layer on the top surface and the porous support on the bottom. PES/DMF membrane showed larger pore structure than PES/NMP. The permeability coefficients of both membranes were in the ultrafiltration range. The coefficient permeability (Lp) of PES/DMF membrane was 35.769 L/m2.hour, much greater compared to PES/NMP membrane which was 15.364 L/ Molecular Weight Cut-Off (MWCO) of PES/DMF membrane was 177 Kda, meanwhile PES/NMP was 186 Kda. Performances of the membranes were evaluated  using dextrane as feed solution. PES/DMF membrane resulted in an higher flux and lower rejection than PES/NMP.Keywords: asymmetric membrane, membrane performance, Molecular Weight Cut-Off (MWCO), morphology, permeability ABSTRAKMembran yang umumnya digunakan untuk proses pemisahan dapat dibuat menggunakan teknik inversi fasa. Penelitian ini bertujuan untuk mengetahui karakteristik membran asimetris polietersulfone (PES) yang dibuat menggunakan teknik inversi fasa dengan variabel jenis pelarut dan Trans Membrane Pressure (TMP). Hasil analisis Scanning Electron Microscopy (SEM) terhadap morfologi membran membuktikan bahwa membran yang dihasilkan merupakan membran asimetris yang terdiri dari dua lapisan yaitu bagian atas merupakan lapisan tipis dan lapisan bawah adalah lapisan berpori. Membran PES/DMF memiliki struktur pori yang lebih besar dibandingkan membran PES/NMP. Koefisien permeabilitas kedua membran yang dihasilkan berada dalam jangkauan ultrafiltrasi. Koefisien permeabilitas (Lp) membran PES/DMF sebesar 35,769 L/m2.jam, nilai ini jauh lebih besar dibandingkan PES/NMP yaitu 15,364 L/ Molecular Weight Cut-Off (MWCO) dari membran PES/DMF yaitu 177 Kda sedangkan membran PES/NMP sebesar 186 Kda. Kinerja membran PES/DMF terhadap pemisahan larutan dekstran memberikan nilai fluks yang lebih tinggi daripada membran PES/NMP sedangkan rejeksi yang dihasilkan lebih rendah. Fluks tertinggi diperoleh pada TMP 2 bar sebesar 11,4 L/m2.jam untuk membran PES/DMF dan 10,2 L/m2.jam untuk membran PES/NMP.Kata kunci:          kinerja membran, membran asimetris, Molecular Weight Cut-Off (MWCO), morfologi, permeabilitas
Pengembangan Usahatani Kopi Liberika Berbasis Indeks Keberlanjutan Di Kecamatan Betara Kabupaten Tanjung Jabung Barat Zuhra, Zuhra; Syarifuddin, Hutwan; Maryani, Anis Tatik
Jurnal Pembangunan Berkelanjutan Vol 2 No 1 (2019): Jurnal Pembangunan Berkelanjutan
Publisher : Universitas Jambi

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Kecamatan Betara merupakan sentral produksi kopi di Kabupaten Tanjung Jabung Barat. Usahatani Kopi liberika menjadi mata pencaharian masyarakat dan telah memiliki sertifikat indikasi geografis (IG) yang harus dipertahankan. Perkembangan produksi dan harga kopi yang fluktuatif berdampak kepada keberlanjutan usahatani kopi liberika. Tujuan penelitian ini adalah mengetahui status keberlanjutan usahatani kopi liberika di Kecamatan Betara, Kabupaten Tanjung Jabung Barat serta alternatif pengembangannya. Berdasarkan metode cluster sampling dan sensus, penelitian ini menggunakan kuesioner dan wawancara dengan pihak terkait dalam pengambilan data. Dimensi ekologi, ekonomi, sosial budaya, teknologi dan kelembagaan dianalisis menggunakan program Rap-Coffee yang merupakan modifikasi dari program Rapfish. Berdasarkan simulasi program Rap-Coffee untuk kelima dimensi keberlanjutan, indeks keberlanjutan usahatani kopi liberika Kecamatan Betara adalah 63,83 yang berarti cukup berkelanjutan. Indeks keberlanjutan ini dapat ditingkatkan dengan memperbaiki indikator sensitif. Sebaiknya untuk mengembangkan usahatani kopi liberika dalam perencanaan kebijakan lebih mengutamakan atau memprioritaskan pada peningkatan indikator/atribut yang memiliki sensitivitas tinggi pada masing-masing dimensi. Alternatif pengembangan untuk memperbaiki kondisi tersebut dapat dilakukan dengan e-klaster.