Study of Shoreline Changes at Jeneberang River Delta, Makassar

The study of shoreline changes during 1990 - 2008 in the delta of the River Jeneberang, Makassar was conducted by evaluating sediment transport into and out of a cell. Longshore sediment transport was computed by considering the influence of heights and angles of the breaking waves. Results of calculation of sediment transport showed that the dominant of sediment transport was to the north during the arrival of the southwest and west waves, and to the south when the wave coming from the northwest. Comparison between shore profiles resulting from model and coastline satellite imagery showed similarity. The difference between the two tend to be occurred at the head land part of the shoreline. This was due to complexity of coastal dynamic at the area. The results of the 19 years shoreline simulation showed that there was a tendency of abrasion at the upsteam head land part as the wave energy tend to converge and accretion at the bay part as the wave energy tend to diverge. Abrasion mainly occurred at Tanjung Bunga (head land) where the coast retreat 181.1 m. Accretion occur in the bay area (Tanjung Merdeka) where the coast advance to the sea for about 59.8 m. The shoreline tend to be stable when the profile was straight such as Barombong Coast

Model Prediksi Kejadian Demam Berdarah Dengue (Dbd) Berdasarkan Unsur Iklim di Kota Kendari Tahun 2000-2015

Kejadian Demam Berdarah Dengue dipengaruhi oleh banyak faktor, salah satunya adalah faktoriklim. Upaya-upaya pengendalian laju kejadian Demam Berdarah Dengue telah dilakukan secara intensifnamun tindakan tersebut belum dapat menekan jumlah penderita DBD secara nasional khususnya diKota Kendari. Model prediksi berdasarkan unsur iklim diharapkan dapat menjadi peringatan dini dalammengantisipasi kejadian DBD. Tujuan penelitian adalah untuk mengetahui model prediksi kejadian DBDberdasarkan korelasi antara unsur iklim (suhu udara rata-rata, kelembaban nisbi, indeks curah hujan,kecepatan angin) dengan kejadian DBD di Kota Kendari tahun 2000-2015. Jenis penelitian inimerupakan studi ekologi atau studi korelasi populasi. Hasil penelitian berdasarkan uji korelasi Pearsonmenunjukkan terdapat korelasi positif lemah dan tidak bermakna antara suhu udara rata-rata dengankejadian DBD di Kota Kendari Tahun 2000-2015 (r=0,230; p>0,05), korelasi positif sedang dan bermaknaantara kelembaban nisbi dengan kejadian DBD di Kota Kendari tahun 2000-2015 (r=0,439; p0,05). Model prediksi yangdiperoleh dari analisis regresi linear yaitu Ln(Kejadian DBD+0,5)= -42,831+0,756*suhu udara ratarata+0,303*kelembabannisbi (R2=24,1%) dengan semua asumsi regresi linear terpenuhi.Direkomendasikan kepada Dinas Kesehatan Kota Kendari agar bekerja sama dengan BMKG dan instansilainnya dalam perencanaan dan pelaksanaan program pencegahan dan pengendalian penyakit DBD diKota Kendari

Utility of 4-(4-acetoaminophenyl)-4-oxo-but-2-enoic acid to prepare Pyranand Pyridine derivatives as building blocks in Heterocyclic Synthesis

The present work is devoted to study the interaction of β -aroylacrylic acid derivative (1) with malononitrile in the presence of piperidine and/or ammonium acetate, then using the formed compounds as a starting material for synthesizing fused and isolated heterocyclic system. Ithas been established that the β-aroylacrylic acid (1) reactwith malononitrile in (DMF) in the presence of piperidineas catalyst with formation of 4H-pyran derivative (2). Bychanging the catalyst into ammonium acetate, pyridine derivative (3) has been obtained. When compound (2) wasallowed to react with triethylorthoformate afforded ethoxymethyleneamino-4H-pyran (4). Compound (4) was used askey starting material for synthesizing some interesting annulated and heterocyclic systems (5-8). Also, the maleamic acid derivatives (9) and (15) have been synthesized via the interaction of (2) and (3) with maleic anhydride to study the behavior of the formed maleamic acid derivatives asanalogies of β-aroylacrylic towards different active methylene compounds under Michael addition reaction (10-14); (16-18)

Doped-carbon electrocatalysts with trimodal porosity from a homogeneous polypeptide gel

One of the biggest challenges for materials science is to design facile routes to structurally complex materials, which is particularly important for global applications such as fuel cells. Doped nanostructured carbons are targeted as noble metal-free electrocatalysts for this purpose. Their intended widespread use, however, necessitates simple and robust preparation methods that do not compromise on material performance. Here, we demonstrate a versatile one-pot synthesis of nitrogen-doped carbons that exploits the templating ability of biological polymers. Starting with just metal nitrates and gelatin, multiphase C/Fe3C/MgO nanomaterials are formed, which are then etched to produce active carbon electrocatalysts with accessible trimodal porosity. These show remarkable performance in the oxygen reduction reaction – a key process in proton exchange membrane fuel cells. The activity is comparable to commercial platinum catalysts and shows improved stability with reduced crossover effects. This simple method offers a new route to widely applicable porous multicomponent nanocomposites