Studi Perubahan Garis Pantai di Wilayah Pesisir Perairan Ujung Blang Kecamatan Banda Sakti Lhokseumawe

Ujung Blang Beach Subdistricts Banda Sakti Lhokseumawe Aceh Province located at coordinat 5°12'34.82" N 97°7'18.74" E. The objective of the present study was to determine the shoreline change along Ujung Blang Beach in the past 10 years, it was in 2005, 2007, 2009, 2011, 2013 and 2015. The method used was by utilizing Geographic Information System (GIS) and remote sensing, by taking Google Earth aerial photos. The result showed the shoreline of Ujung Blang Beach changed by average value of accretion per year was 0,2193 ha and average value of abration per year was 0,3819 ha. This value showed that abration occured more bigger than accretion with the difference of the percentage increase 74.15%. For decrease or increase value of shoreline change was 74 m (maximum decrease) and 14 m (maximum increase). Pantai Ujung Blang Kecamatan Banda Sakti Lhokseumawe Provinsi Aceh berada di titik koordinat 5°12'34.82" N 97°7'18.74" E. Tujuan penelitian ini adalah untuk mengetahui Perubahan pergeseran garis pantai di sepanjang pantai Ujung Blang dalam kurun waktu 10 tahun yaitu pada tahun 2005, 2007, 2009, 2011, 2013 dan 2015. Metode penelitian digunakan dengan memanfaatkan teknologi Sistem Informasi Geografis (SIG) dan penginderaan jauh, dengan mengambil data foto udara Google Earth. Hasil penelitian ini menunjukkan bahwa garis pantai Ujung Blang mengalami Perubahan dengan nilai rata-rata akresi pertahun yaitu 0,2193 ha dan nilai rata-rata abrasi pertahun 0,3819 ha. Nilai ini menunjukan bahwa abrasi terjadi lebih besar dari akresi dengan selisih persentase peningkatan 74,15%. Untuk nilai pengurangan atau penambahan Perubahan garis pantai sebesar 74 m (pengurangan maksimum) dan 14 m (penambahan maksimum)

Hubungan Panjang Berat dan Faktor Kondisi Lobster (Panulirus SP.) di Perairan Pantai Simeulue

The purpose of this research was to know the long weight relation, condition factor and sex-ratio lobster located in the east of Simeulue beach. This research has been done on February 2016 in floating fish cages, the trade collector located at the bay Sinabang, East Simeulue regency is the owner of the floating fish cages. The method of this research was a survey method. Lobster sample was taken 30% of the total lobster captured. It was carried out as many six times as interval five days. The results of this work were found two type of the lobsters which includes Paniluirus penicillatus and Panulirus versicolor composition with 53 and 47%. Based on counting of a long weight relation of Panulirus penicillatus found an equivalence W= 0,00372L 2,571 and Panulirus versicolor with equivalence W= 0,003276 2,609, the value b indicates both type of the lobsters has negative allomatrict growth nature. the average body weight relative value (Wr) and condition factor (K) both type of those lobsters, Panulirus penicillatus value Wr= 100,76 ±12,58 and value K= 2,25 ±0,35, whereas, the Panulirus versicolor value Wr= 101,59 ±16,41 and K= 2,15 ±0,42. Body weight relative of both type of those lobsters over 100 grams indicates that the east Simeulue beach still support for the lobster growth. Condition factor value shows both type of those lobster has the same scale. Based on the survey was found that sex-ratio of Panulirus penicillatus 1:1,04 and Panulirus versicolor 1,17:1. This case showed that the sex-ratio of both these lobsters still in the same ratio

Contribution of Heat Fluxes on Cyclone Narelle as Simulated by a Mesoscale Model

- Heat fluxes from oceanic evaporation particularly latent heat is important to drive the formation and intensification of Cyclone Narelle. The research was carried out by introducing a mesoscale model, namely Weather and Research Forecasting (WRF). One domain with spatial resolution at 10 km was utilized in the model. The model involved significant physical parameters, e.g., Kain-Fritsch in the cumulus scheme, Yonsei University in the Planetary Boundary Layer scheme, and WRF Single-Moment 3-class in the microphysics scheme. The analysis focused on January 8th to 14th upon all stages of Narelle. The result showed that Sea Surface Temperatures (SST) higher than 26°C was a favorable environment for Cylone Narelle to form. Surface sensible and latent heat fluxes have strong positive correlation with wind speed and SST. It can be concluded that these variables were highly correlated with surface heat flux that further lead to the formation and intensification of Cyclone Narelle in early January 2013 over South Indian Ocean. The tracks and stages of the model are nearly similar to the observations, the differences are found in late phases of Narelle

The mechanism of energy release and field-aligned current generation during substorms and solar flares

In this paper, the mechanisms of field-aligned current (FAC) and westward electrojet generation are considered on the base of space measurements and laboratory simulation. Upward and downward FAC are generated in the Earth magnetotail current sheet (CS) due to the tail earthward electric field. They are connected in the ionosphere by the Pedersen current. The FAC enhancement takes place during magnetic reconnection and explosive energy release at a substorm. Electron acceleration in upward FAC produces fast electron precipitation and aurora appearance. The westward electrojet (Hall current) is located between two opposite directed sheets of FAC. The current in the jet is determined by the Hall conductivity in the ionosphere. The similar current systems in the solar corona are responsible for energy transfer to the chromosphere during a solar flare. The solar flare model is built on the base of observations and 3D MHD numerical simulation for compressible resistive plasma

Identifikasi Jenis Ikan di Perairan Laguna Gampoeng Pulot Kecamatan Leupung Aceh Besar

Lagoon waters at the Pulot Village is a new ecosystem that is formed because of the tsunami disaster that occurred on December 26, 2004, followed the earthquake in March 2005 that led to the formation of a new coastal wetland ecosystem called lagoons. Laguna is a puddle of water that resembles a lake / pond is located near the beach that used to be part of the (united with) the sea but because of geological events, then it is separate from the marine ecosystem and establish a new coastal wetlands. Fish fish found in the lagoon waters Pulot village is 11 species representing 10 families. The species of fish caught is Caranx melampygus, Carangoides caeruleopunctatus, Diodon liturosus, Stolephorus heterolubus, Platax batavianus, Plectorhinchus lineatus, Lutjanus russelli, Karalla daura, Crenimugil crenilabis, Epinephelus coiodes, and Toxotes jaculatrix. Fish dominate in lagoon waters in terms of number of individuals is kind Stolephorus heterolubus and Crenimugil crenilabis. Fish caught from the time data is based on foraging habits of each, there are 4 types of fish are caught in nocturnal (active at night) and 7 species caught during the diurnal (active during the day). Keywords: lagoon, fish, nocturnal, diurnal, Aceh Kawasan perairan laguna di Gampoeng Pulot merupakan suatu ekosistem baru yang terbentuk karena terjadinya bencana tsunami yang terjadi pada tanggal 26 Desember 2004, lalu diikuti gempa bumi pada Maret 2005 yang menyebabkan terbentuknya suatu ekosistem lahan basah pesisir baru yang disebut laguna. Laguna adalah suatu genangan air yang menyerupai danau/telaga berada dekat pantai yang dulunya merupakan bagian dari (bersatu dengan) laut tapi karena peristiwa geologis, kemudian ia terpisah dari laut dan membentuk eksosistem lahan basah pesisir yang baru. Jumlah ikan yang ditemukan di perairan laguna desa Pulot adalah 11 jenis yang mewakili 10 keluarga. Spesies ikan yang ditangkap adalah Caranx melampygus, Carangoides caeruleopunctatus, Diodon liturosus, Stolephorus heterolubus, Platax batavianus, Plectorhinchus lineatus, Lutjanus russelli, Karalla daura, Crenimugil crenilabis, Epinephelus coiodes, dan Toxotes jaculatrix. Ikan mendominasi di perairan laguna dalam hal jumlah individu jenis Stolephorus heterolubus dan Crenimugil crenilabis. Ikan yang ditangkap dari data waktu didasarkan pada mencari makan kebiasaan masing-masing, ada 4 jenis ikan yang tertangkap di nokturnal (aktif di malam hari) dan 7 spesies tertangkap selama diurnal (aktif di siang hari)

Optical coherence tomography findings in paraneoplastic pseudovitelliform lesions in melanoma-associated retinopathy

Michael Javaheri1, Rahul N Khurana1, Rizwan A Bhatti1, Jennifer I Lim21Doheny Retina Institute, Doheny Eye Institute, Department of Ophthalmology, University of Southern California, Keck School of Medicine, Los Angeles, CA, USA; 2Eye and Ear Infirmary, Department of Ophthalmology, University of Illinois, Chicago, IL, USAPurpose: To report an unusual case of paraneoplastic pseudovitelliform lesions associated with melanoma-associated retinopathy (MAR).Design: Observational case report.Methods: Retrospective review of the ophthalmic examination, fundus photography, fluorescein angiography, electroretinogram (ERG), and optical coherence tomography (OCT) of a patient with MAR.Results: A 65-year-old Caucasian man with a two-year history of metastatic melanoma was referred for evaluation of a six-month history of nyctalopia. Funduscopic examination in both eyes revealed multiple, creamy, yellow, pseudovitelliform lesions in the posterior pole, varying in size from 100–500 µm, at the level of the outer retinal/retinal pigment epithelium (RPE) junction, coalescing along the inferior portion, with overlying macular neurosensory detachments. OCT showed bilateral macular neurosensory detachments with multiple small areas of high refl ectivity at the level of the outer retinal/RPE junction. ERG demonstrated a selective loss of the b-wave and a normal a-wave under dark adapted, scotopic conditions.Conclusion: Clinicians should be aware of this atypical presentation of MAR that may include pseudovitelliform retinal findings.Keywords: cancer-associated retinopathy, melanoma-associated retinopathy, optical coherence tomography, paraneoplastic syndrome, paraneoplastic pseudovitelliform retinopath

Defect engineering for improved photocatalytic performance of reduced lead titanate (PbTiO3) under solar light irradiation

Lead titanate (PbTiO3) nanoparticles were prepared successfully by template free hydrothermal  method. Size, crystallinity, morphology and phase determination of the nanoparticles were made by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS) and field-emission scanning electron microscopy (FESEM). FESEM results had shown that all nanoparticles were in the range between 20 to 40 nm size and found in the form of agglomerates. The average crystallite size of PbTiO3 nanoparticles was calculated to be nearly 35 nm. PbTiO3 nanoparticles were reduced by hydrogenation at high temperature to make the material active for visible light. Furthermore, optical absorbance of PbTiO3 nanoparticles was determined by applying ultraviolet-visible-near infrared (UV-Vis-NIR) spectroscopy. By using Davis-Mott model, the direct optical band gap of 2.65 eV was acquired. Methyl orange (MO) was used as pollutant to check the photocatalytic activity of reduced PbTiO3 nanoparticles under solar light irradiation. Photocatalytic activity of reduced PbTiO3 nanoparticles increased 2.6 times more than that of pure PbTiO3 nanoparticles for methyl orange (MO) under solar light irradiation.               KEY WORDS: Lead titanate (PbTiO3), Photocatalytic performance, Hydrothermal growth, Solar light, Irradiation Bull. Chem. Soc. Ethiop. 2019, 33(2), 373-380.DOI: https://dx.doi.org/10.4314/bcse.v33i2.1

Band gap engineering for improved photocatalytic performance of CuS/TiO2 composites under solar light irradiation

ABSTRACT. Nanoparticles of CuS, TiO2 and CuS/TiO2 composites were prepared by template free hydrothermal method. Prepared nanoparticles were characterized by X-ray diffraction (XRD) and electron dispersive X-ray spectroscopy to confirm the formation of nanoparticles. Field emission scanning electron microscopy (FESEM) was applied to investigate the morphology and particle size of the nanoparticles which were measured in the range of 30–40 nm. Photocatalytic performance of CuS, TiO2 and Cus/TiO2 were measured by degradation of methyl orange (MO) under solar light irradiation. Coupling of n-type TiO2 (3.2 eV) with p-type CuS (1.9 eV) showed efficient degradation of the contaminants under the solar light irradiation. Photocatalytic performance of CuS/TiO2 composite improves 1.4 times than CuS for the degradation of methyl orange (MO) under solar light irradiation.               KEY WORDS: CuS/TiO2 composites, Photocatalytic performance, Hydrothermal growth, Solar light, Irradiation Bull. Chem. Soc. Ethiop. 2019, 33(3), 561-571.        DOI: https://dx.doi.org/10.4314/bcse.v33i3.1

WEAKLY NONLINEAR STABILITY ANALYSIS OF A NON-UNIFORMLY HEATED NON-NEWTONIAN FALLING FILM

ABSTRACT A thin liquid layer of a non-Newtonian film falling down an inclined plane that is subjected to non-unifor