Studies on bio-organic materials for optoelectronic devices have increased recently, mainly due to the low cost of the materials. Electrical properties of the materials are important to review whether a material is suitable for optoelectronic applications. The energy gap is an important parameter to investigate the electrical properties of materials, and therefore, the band gap value has to be determined accurately. The energy gap of a semiconductor material can be calculated from its absorption spectrum using the Tauc plot method. In this article, we designed software based on the Tauc plot method (Taucplot4dotz) and ran a trial test using data from our previous studies on Sukun (Artocarpus Altilis) leaves extract and Gamal (Gliricidia Sepium) leaves extract. Results obtained were more accurate than our previous calculations since here we used both horizontal dan vertical linear extrapolation lines compared to only one in our previous calculations. We also used re-fitted data of ZnO [26]. Our accurate and fast calculation using the software showed that energy gap values of Sukun leaves and Gamal leaves extract were 3.033 eV and 1.833 eV, respectively. For ZnO, the energy gap was found to be 3.6205 eV, slightly different from the original data (3.625 eV) [26]. From the results, it can be concluded that the software provides an easier and faster calculation of energy gap values of materials, from which one can further investigate the potential of the materials suitable for optoelectronic devices based on bio-organic materials.
AbstrakPelabuhan Kalabahi-Alor di lahan milik PT (persero) pelabuhan Indonesia III Cabang Kupang, dengan luas daerah daratan pelabuhan 71.131 m2 dan lingkungan kerja perairan 1.880 Ha. Sedangkan luas lingkungan kepentingan adalah 1.813 Ha. Dengan ukuran 4 x 5 meter untuk dermaga I dan 115 x 10 meter untuk dermaga II. Wilayah monitoring termasuk dalam wilayah Kelurahan Teluk Mutiara, Kecamatan Teluk Mutiara, Kabupaten Alor Provinsi NTT. Kegiatan ini dilakukan untuk analisis monitoring kualitas perairan laut di lingkunganpelabuhan umum Kalabahi-Alor.Kualitas air meliputi kualitas kimia-fisika perairan laut disekitar pelabuhan. Sampel air laut diambil dari 3 (tiga lokasi) yang berbeda. Hasil analisis dan pemantauan menunjukan bahwa kualitas air laut di kawasan pelabuhan merupakan dampak dari:kegiatan perkapalan (pengoperasian kapal dan kecelakaan kapal), limbah yang berasal dari limbah kapal (bongkar-muat barang), aktivitas pelabuhan lainnya (seperti kegiatan kuliner),saluran drainase yang bermuara kelaut, bocoran dan tumpahan pembongkaran muatan yang bercampur minyak dan oli dari sisa ballast dan air sisa pencucian, serta limbah pemukiman yang masuk secara langsung di pinggiran pelabuhan.Data kualitas (sifat kimia-fisika) air laut wilayah perairan pelabuhan Umum Kalabahi yang dilaksanakan secara analisis insitu maupun laboratorium menunjukkan bahwa seluruh parameter yang diukur masih memenuhi baku mutu yang diizinkan oleh peraturan pemerintah.Kata Kunci: analisis, kualitas air laut, pelabuhan Waingapu AbstractKalabahi-Alor port on land owned by PT (Persero), the Indonesian port of Kupang Branch III, with an area of 71 131 m2 area of port land and waters 1,880 Ha working environment. While the broad sphere of interest is 1,813 Ha. With a size of 4 x 5 meters to the pier I and 115 x 10 meters to dock II. Monitoring region including the Gulf Pearl Village area, Teluk Mutiara, Alor Regency NTT Province. This activity is carried out for the analysis of sea water quality monitoring in the public ports Kalabahi-Alor. The quality of water include chemical-physical quality of the marine waters around the port. Sea water samples taken from 3 (three locations) are different. The results of analysis and monitoring showed that the seawater quality in the port area is the impact of: the activities of shipping (operation of ships and shipwrecks), waste from waste ship (loading and unloading), the activity of other ports (such as culinary activities), drainage channels which empties into the sea, leaks and spills that mixes the unloading of oil and oil from the remaining residual ballast water and washing, as well as residential waste that goes directly on the outskirts of the port. Data quality (chemical-physical) sea water port water area Kalabahi General conducted an in situ and laboratory analysis showed that all the measured parameters still meet quality standards permitted by government regulations.Keyword : analysiss, sea water quality, Waingapu port
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