Studi Percepatan Tanah Maksimum Di Daerah Istimewa YOGYAKARTA Dengan Metode NGA (Next Generation Attenuation)

Yogyakarta merupakan daerah yang rawan akan bencana gempabumi. Gempabumi Yogyakarta yang terjadi pada tanggal 27 Mei 2006 telah menelan ribuan korban jiwa dan ratusan ribu bangunan rusak. Untuk mengetahui nilai percepatan tanah maksimum di Daerah Yogyakarta maka dilakukan penelitian perhitungan percepatan tanah maksimum empiris menggunakan rumusan atenuasi NGA (Next Generation Attenuation). Data penelitian yang digunakan adalah data parameter gempabumi daerah Yogyakarta dan sekitarnya, diperoleh dari United State Geological Survey (USGS) selama 41 tahun yaitu antara tahun 1973 - 2014. Nilai percepatan tanah maksimum tertinggi sebesar 389 gal terletak pada koordinat 7.950 LS - 110.450 BT dan percepatan tanah maksimum terendah sebesar 112,04 gal terletak pada koordinat 8.350 LS - 111.50 BT. Wilayah-wilayah yang memiliki nilai percepatan tanah maksimum terbesar berada di daerah Bantul, Gunung Kidul, Kulon Progo, Sleman, Klaten, Kebumen, Tegal, Imogiri, Jetis, dan Pandak. Dari penelitian ini dapat disimpulkan bahwa daerahYogyakarta memiliki resiko yang besar dalam bencana gempabumi

Evaluation of external radiological hazard in bottom and fly ash from coal fired pilot plant

Coal is the most important fossil fuel for non-nuclear power generation industries. The burning of coal generates ashes which contain natural radionuclides namely 238U and 232Th series including 40K that are released into the environment. This study presents an evaluation of the radioactivity content found in the feed coal and ashes sampled from typical coal fired power plants. The sample was measured for activity concentration of the radionuclides and the results were used to evaluate the radiological hazard index of the sample.The findings revealed that the values of the external radiological hazard obtained were acceptable and safe to be reutilized

Sensory characteristics and putrefaction test of broiler chicken meat dipping in Syzygium polyanthum infusion with different storage time

This study aims at evaluating the sensory characteristics and putrefaction testing of broiler chicken meat dipping in Syzygium polyanthum infusion with different storage time. Observations were made on sensory quality of raw meat (color and aroma), cooked meat (color, aroma, flavor, and tenderness), and putrefaction testing of the eber test. The study considered two treatments, namely Syzygium polyanthum infuse concentrations (0 vs. 15%) during 30 minutes and different storage times at 4°C (0, 2, 4, 6, and 8 days) where each treatment repeated three times. The sensory characteristics test of chicken meat is performed by the panelist method. The collected data were analyzed by analysis of non-parametric with the Kruskal Wallis test. The results of the rot test were analyzed descriptively qualitatively. Data showed that the concentration of Syzygium polyanthum infusion and storage time could reduce the color and improve the aroma of raw meat and also tenderness and the smell of cooked meat. The initial rot of control chicken meat and bay leaf on day 4 with positive parameters used the Postma test and control chicken meat using the H2S test

Electropolymerization of poly(aniline-co-p-toluidine) on copper and its application as a corrosion inhibitor

This paper aims to compare the inhibitive effects of polyaniline (PAni), poly(p-toluidine) and poly(aniline-co-p-toluidine) in hydrochloric acid (HCl) solution. Design/methodology/approach – The electrochemical deposition of PAni, poly(p-toluidine) and poly(aniline-co-p-toluidine) on pure copper metal was studied potentiodynamically. The copolymer deposited was characterized by Fourier transform infrared (FTIR) spectroscopy, ultraviolet (UV)-visible spectroscopy and scanning electron microscopy (SEM). The corrosion inhibition studies on copper electrode were performed using electrochemical methods, viz, open circuit potential (OCP) measurements, potentiodynamic polarization scans and electrochemical impedance spectroscopy (EIS) tests, conducted in 0.1 M HCl solution. Finding – The results of the study reveal that the copolymer of poly(aniline-co-p-toluidine) at the optimum concentration of 1 × 10−3 M has better corrosion inhibition efficiency as compared to PAni and poly(p-toluidine). Research limitations/implications – The conducting polymers are difficult to deposit on the metal surface because of their high dissolution tendency before the electropolymerization potential of the monomer is achieved. Practical implications – From an environmental viewpoint, poly(aniline-co-p-toluidine) is a toxic and hazardous conducting polymer. Originality/value – The paper demonstrates that poly(aniline-co-p-toluidine) showed better dispersion in different organic solvents and had higher corrosion inhibition efficiency than PAni.Scopu