Batu Split Dan Cutting Bor Untuk Material Stemming Dalam Kegiatan Pemberaian Batuan Dengan Peledakan

At mining industry usually use blasting method to breaking hard and compact rock. Blasting operation using two types of stemming material such drill cutting and crushed rock or composite of both. Stemming is column at the top of blast hole that filled by its. Length of stemming column and types of stemming materials can influence the result of blasting fragmentation. Longer stemming will produce a boulder while shorter stemming will produce fly rock and the fragment size is too small. Stemming material too soft can cause the blast energy distribution not separated well so the blasting operation achievement is not optimum.This research observed and evaluated the blasting fragment size, boulder, and blasting recovery that occur from mining blasting activity used two types stemming material such drill cutting and crushed stone.The result indicated use of drill cutting material is not strong enough to withstand the blast energy towards to the top of blasting hole then produce fly rock and 26.6 % boulder. Crushed stone material gives the best result for 10.09% boulder and 93% blasting recovery but need more expense for it. The improvement using double deck method with combine stemming material is better and gives the optimum blasting with 8.8% boulder and 91% blasting recovery

FAKTOR RISIKO ASUPAN ENERGI DAN RIWAYAT PENYAKIT INFEKSI TERHADAP STUNTING PADA BALITA 24-59 BULAN

Stunting is a condition of a child’s height below normal ( 2SD)  based on nutritional status according to WHO child growth standard, Indicates chronic malnutrition in early growth and development of life. In 2017, around 150,8 million children under five in the world were stunted, half of children from Asia (55%), while 39% live in Africa. The desaign of this research used a case control study. The population this study was all children aged 24-59 month in Guntur I health center. Sampling techniques using simple random sampling amounted to 32 case and 32 control, data were analyzed with Chi-Square. The results of the study showed that energy intake was a risk factor for stunting (p value 0,012 OR 4,259 95%CI 1,488-12,192) and infection desease is not a risk factor for stunting (p value 0,080 OR 4,324 95%CI 1,010,462-7,643). The results of the overall analysis showed that low intake energy was a risk factor for stunting in children aged 24-59 month

Kajian Penggunaan Moda Transportasi Sungai Di Kota Jambi

Keberadaan transportasi sungai yang masih tetap digunakan sampai saat ini dipengaruhi oleh banyak faktor. Penelitian ini bertujuan mendeskripsikan perkembangan penggunaan transportasi sungai, menemukenali faktor-faktor yang mempengaruhi, mendeskripsikan persepsi masyarakat, memberikan masukan kebijakan. Penelitian ini merupakan penelitian survey dengan menggunakan metode analisis campuran. Hasilnya adalah transportasi sungai pada awalnya menggunakan perahu dayung tanpa mesin. Setelah tahun 1976an hingga sekarang, menggunakan tenaga mesin bermotor. Faktorfaktor yang mempengaruhi penggunaan transportasi sungai adalah tujuan perjalanan, waktu perjalanan, harga, efektivitas waktu, dan Kenyamanan. Persepsi masyarakat mengenai pelayanan transportasi sungai tergolong baik. Moda ini masih penting dan sangat diperlukan. Pemerintah harus memperhatikan keberadaan dan pengelolaan transportasi sungai tidak hanya sebagai sarana penyeberangan tetapi dapat dikembangkan menjadi sarana transportasi wisata yang dapat menarik wisatawan guna mendukung konsep pembangunan kawasan tepi sungai sebagai waterfront city

Pemodelan Periodik Dan Stokastik Curah Hujan Kota Bandar Lampung

This research aims to study the periodic and stochastic modeling of daily precipitation data series. The study was carried out using data of daily rainfall data with a length of 13 years (1987 – 2000) from Pahoman, Sumur Putri, and Sumber Rejo rainfall stations. The rainfall series used is as- sumed to be free from the influence of the trend. This research use how to convert data into time series sepektrum rain precipitation using program FFT (Fast Fourier Transform). Periodicity of daily rainfall data is presented using a periodic component 512. Stochastic rainfall series of rain- fall data is assumed as the difference (error) between the rainfall data with periodic rainfall model using 512 components. Based on the data series on stochastic stochastic component, calculated using the approach of the autoregressive model. Stochastic models presented by using a autore- gressive model of order two. The results of this research is the value of the correlation coefficient of the average precipitation three stations. For this study, the average correlation coefficient (R) between data and model of 0,9719 is periodic, between data and stochastic model is 0,9974, and between the data and the model with stochastic is 0,9974. From these results it can be concluded that periodic stochastic model of the rainfall of the Bandar Lampung City that processing model using 512-series compo- nents, presented a very significant approach