Judul: Mapping of Mangrove Area Changes in Kaliwlingi Village, Brebes Regency, Jawa Tengah Province
Abstrak: Berdasarkan penelitian sebelumnya, Pesisir Desa Kaliwlingi, Kabupaten Brebes mengalami abrasi sepanjang 7 km dengan luas 186 hektar atau 30% dari luas abrasi di Kabupaten Brebes. Hal tersebut diakibatkan oleh adanya konversi lahan mangrove menjadi tambak yang dapat merusak lahan pantai. Peningkatan abrasi setiap tahun mendorong masyarakat peduli lingkungan melakukan kegiatan konservasi lahan mangrove untuk mengurangi abrasi dan akresi, disepanjang pantai. Penelitian ini bertujuan untuk mengetahui nilai threshold yang memisahkan mangrove dengan non-mangrove dan luasan mangrove. Penelitian ini menggunakan data citra Sentinel-2A dan data lapang hasi survei. Data satelit diolah dan dianalisis menggunakan algoritma Mangrove Vegetation Index (MVI). Simple random sampling digunakan untuk menentukan pengambilan titik lapang yang digunakan sebagai acuan klasifikasi kelas mangrove dan non-mangrove dari citra satelit. Uji akurasi algoritma MVI menggunakan matriks konfusi, dan koefisien kappa. Hasil penelitian menunjukan jenis mangrove di sekitar 4 stasiun penelitian adalah Avicennia marina, Avicennia alba, dan Rhizophora mucronata. Hasil pemetaan menggunakan algoritma MVI menunjukkan nilai threshold MVI mangrove berkisar antara 2,3 hingga 19,54, sementara nilai non-mangrove adalah <2,3 dan >19,54. Luasan mangrove dari tahun 2016 hingga 2022 mengalami peningkatan sebesar 27,62 ha. Uji akurasi algoritma MVI menunjukkan hasil yang baik dengan overall accuracy 86,81% dan koefisien kappa sekitar 0,73., Based on previous research, Kaliwlingi Village Coastal, Brebes Regency experienced abrasion along 7 km with an area of 186 hectares or 30% of the abrasion area in Brebes Regency. It happened due to the conversion of mangrove land into ponds that can damage coastal land. The increase in abrasion every year encourages people to care about the environment to carry out mangrove land conservation activities to reduce abrasion and accretion, along the coastal. This study aims to determine threshold value that separates class between mangroves and non-mangrove area, then estimate the changing area of mangrove. This study used Sentinel-2A imagery datas and survey field data. Satellite data processed and analyzed, was using the Mangrove Vegetation Index (MVI) algorithm. Simple random sampling used to determine the selection of field points used as a reference for classifying mangrove and non-mangrove classes from satellite images. Test the accuracy of the MVI algorithm used a fusion matrix, and a kappa coefficient. The results showed that the types of mangroves around 4 research stations were Avicennia marina, Avicennia alba, and Rhizophora mucronata. The mapping results used the MVI algorithm showed that the threshold value of mangrove MVI ranged from 2,30 to 19,54, while non-mangrove values were <2,30 and >19,54. The area of mangroves from 2016 to 2022 has increased by 27,62 ha. The MVI algorithm accuracy test showed good results with an overall accuracy was 86,81% and a kappa coefficient was 0,73.
Keyword: Abrasion, Mangrove, MVI, Non-mangrove, Threshold

Judul: Macrozoobenthos Diversity on the Mangrove  Ecosystem in Coast of Kaliwlingi Village, Brebes, Central Java
Abstrak: Ekosistem mangrove merupakan habitat flora dan fauna di daerah pantai dan berfungsi menopang hidup biota perairan salah satunya bentos. Makrozoobentos merupakan organisme yang hidup di dasar perairan dan dipengaruhi oleh kualitas perairan. Desa Kaliwlingi, Brebes, Jawa tengah memiliki vegetasi mangrove yang luas yang mengalami alih fungsi hutan menjadi tambak yang massif sehingga menyebabkan rusaknya ekosistem dan perlunya penelitian terkait makrozoobentos di kawasan mangrove. Tujuan dari penelitian ini adalah mengidentifikasi dan menganalisis keanekaragaman makrozoobentos di ekosistem mangrove Desa Kaliwlingi, Brebes, Jawa Tengah yang dilaksanakan pada bulan November 2022. Metode yang digunakan yaitu metode plot transek garis. Data yang dikumpulkan dengan melakukan survei dan pengamatan langsung. Hasil penelitian menunjukkan bahwa kerapatan mangrove tergolong jarang dengan kisaran 70 ind/1000 m2 dan keanekaragaman makrozoobentos tergolong rendah dengan kisaran 1,62. Jenis makrozoobentos yang ditemukan 7 jenis yaitu Cassidula vespertilionis, Cerithideopsilla cingulata, Cheilonereis sp., Polinices incei, Puperita sp., Sesarma sp., dan Telescopium telescopium. Jenis mangrove terdapat 3 jenis yaitu Avicennia marina, Avicennia alba dan Rhizophora mucronata. Substrat lokasi penelitian didominasi jenis pasir halus. Hasil analisis CA menunjukkan Makrozoobentos jenis Cerithideopsilla cingulata dan Telescopium telescopium berasosiasi dengan mangrove jenis Rhizophora mucronata dengan kerapatan terendah dan tertinggi serta Avicennia alba dengan kerapatan rendah; Cheilonereis sp., Cassidula vespertilionis, dan Sesarma sp.; Polinices incei berasosiasi dengan Avicennia alba kerapatan terendah; sedangkan Puperita sp. tidak berasosiasi dengan jenis mangrove yang ada di lokasi penelitian., The mangrove ecosystem is a habitat for flora and fauna in coastal areas and functions to support the life of aquatic biota, one of which is the benthic. Macrozoobenthos are organisms that live at the bottom of the waters and are affected by water quality. Kaliwlingi Village, Brebes, Central Java has extensive mangrove vegetation which has experienced a conversion of forest functions into massive ponds causing damage to the ecosystem and its is necessary to carry out research related to macrozoobenthos in the mangrove area. The purpose of this study was to identify and analyze the capture of macrozoobenthos in the mangrove ecosystem of Kaliwlingi Village, Brebes, Central Java and was conducted in November 2022. The method used is the line transect plot method. Data collected by conducting surveys and direct observation. The results showed that the density of mangroves was relatively rare with a range of 70 ind/1000 m2 and macrozoobenthic habitats were classified as low with a range of 1.62. There were 7 types of macrozoobenthos found, such as Cassidula vespertilionis, Cerithideopsilla cingulata, Cheilonereis sp., Polinices incei, Puperita sp., Sesarma sp., and Telescopium telescopium. There are 3 types of mangroves namely Avicennia marina, Avicennia alba and Rhizophora mucronata. The substrate of the research location is dominated by fine sand. CA analysis results showed that the macrozoobenthos types Cerithideopsilla cingulata and Telescopium telescopium were associated with mangrove species Rhizophora mucronata with the lowest and highest densities and Avicennia alba with low densities; Cheilonereis sp., Cassidula vespertilionis, and Sesarma sp.; Polinices incei associated with Avicennia alba lowest density; while Puperita sp. not associated with mangrove species in the study area.
Keyword: Association, Density, Macrozoobentos, Mangrove

Judul: Pengaruh Pairing pada Isotop Sn dengan Menggunakan Pemodelan Sembilan Tingkat Energi
Abstrak: Formation of the neutron-rich tin isotopes (Sn isotopes) is the one of the interesting topics in the field of nuclear reaction, especially regarding the stability of the heavy nuclei. Calculations of total energy using the BCS approach using five energy levels can only calculate the total energy up to Sn50132. On the other hand, the experiment continues and has exceeded the formation of isotopes. Therefore, there is need for a new model to accomadate more neutrons. In this research, Sn isotopes is modelled using nine energy levels and constant interaction potential to explain the pairing phenomenon up to Sn50154. However, to obtain more accurate results, other methods to minimize the differences with the experimental results are clearly needed here.
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