11 articles in this issue
Ferra Yanuar, Mardha Tillah, Dodi Devianto
This article aims to model factors affecting HDI (Human Development Index) in North Sumatera by 2015 using ridge regression method. This ridge regression method is used because in the IPM data there is a multicolinearity problem so that the least squares ... see more
Weni Enjelina, Mansyurdin Mansyurdin, Tesri Meideliza
The Study about Analysis of Nepenthes Hybrids in Taratak Hill, Pesisir Selatan Sumatera Barat by RAPD Technique had been conducted from May until November 2011. The study was done to prove natural hybrids of Nepenthes by RAPD technique and to determine th... see more
Nendi Suhendi Syafei, Darmawan Hidayat, Emilliano Emilliano, Liu Kin Men
The oil and gas industry exploration that will generally be followed by corrosive substances including sweet gas (eg H2S and CO2), it will result in corrosion event. The corrosion stress cracking will cause the carbon steel pipe to break so that productio... see more
Budy Santoso, Setianto Setianto, M U Hasanah, B Wijatmoko, E Supriyana, H Mohammad
Land movement occurs due to reduced soil strength which is affected by water pressure. The Self Potential (SP) method is a geoelectric method that can detect well the flow of groundwater. The Self Potential method can also be used to detect the presence o... see more
Hesty Parbuntari, Yona Prestica, Rizki Gunawan, Meri Novia Nurman, Fransiska Adella
One of the important processes of cocoa plants growing is pruning. It aims to eliminate sick, broken, or the appearance of water buds disturbing the cacao production. The period of pruning is varios. The various periods of pruning lead to leave wide waste... see more
Marta Dinata, Fitridawati Soehardi
This research to identify the physics chemistry vegetation of water on the outskirts of the Siak in terms of quality of the siak river good chemically, physics and biology and the erosion on a cliff the siak good use cliff safety and still in the original... see more
Fatma Suryani Harahap, Laila Tussifah Lubis
Systems of waste management in Padangsidimpuan City is an open dumping system. The location of the Padangsidimpuan City landfill is carried out at the Batu Bola TPA located in Batu Bola Village which is 120 meters from the Batang Ayumi river flow. Continu... see more
Badrulfalah Badrulfalah, I Irianingsih, Khafsah Joebaedi
This paper discusses some operations on mixed monotone operator in Banach space, especially addition an multiplication operations. We will prove the sum and product of two mixed monotone operators. The proof using some relevant definitions. The result is ... see more
Khafsah Joebaedi, K Parmikanti, Badrulfalah Badrulfalah
First order Space-Time Autoregressive model is one of the models which involves location and time. STAR(1;1) model stationary can be used to forecast future observation at a location based on one previous time of its own location and the spatial neighborh... see more
Sofyanita Sofyanita, Zona Octaria
Fenthion an active compound contained in EC 500 lebaycid pesticides that are toxic. To reduce the level of toxicity will be degradation in sonolysis, ozonolysis and sonozolysis with the addition of TiO2-anatase. Degradation results in sonolysis, ozonolysi... see more
Vauzia Vauzia, Eliza Gusmira
The purpose of this research is to know the response of jabon seeds germination against combustion and ilumination. The design that is used is RAL with 2 factors in it. The first is from the duration of combustion and the second is from the illumination t... see more