Garuda - Garba Rujukan Digital

Article Per Year (5 Year)

All

Natural B

NATURAL B
Website

Published by Universitas Brawijaya

ISSN : - EISSN : - DOI : -

Core Subject : Social,

Environmental Science

Anda dapat mengakses artikel-artikel hasil penelitian khususnya bidang lingkungan dan kesehatan. Untuk informasi lebih lanjut, silakan menghubungi redaksi jurnal.

Arjuna Subject : -

Articles 15 Documents

1 2

Search results for , issue "Vol 2, No 3 (2014)" : 15 Documents clear

Geographically Weighted Regression Modeling with Fixed Gaussian Kernel Weighted on Spatial Data (Case Study of Food Security in Tanah Laut District of South Kalimantan) Tutuk Munikah
Natural B, Journal of Health and Environmental Sciences Vol 2, No 3 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

Geographically Weighted Regression (GWR) is a regression model that takes into account the spatial heterogeneity effect. In regression models, often there is a relationship between two or more predictor variables is called multicollinearity. Geographically Weighted Lasso (GWL) is a method used to overcome spatial and spatial heterogeneity of local multicollinearity. The purpose of this study establishes the model by using the method of GWL in the case of spatial heterogeneity and overcome local multicollinearity on the issue of food insecurity in Tanah Laut district. Generally, food insecurity in Tanah Laut district is affected by the percentage of the population without access to electricity, the average number of store/grocery shop, and percentage of children under five and maternal mortality. GWL models obtained in accordance with the number of observation locations. The results validate the secondary data showed that the model obtained in the study are in accordance with the actual conditions in the field. Models with fixed weighting Gaussian Kernel is able to predict the eight villages with food security conditions are the same as the secondary data.

Effect of Nitrogen Fertilizer on Calcium Oxalate Calibration Density of Porang Bulb (Amorphophallus muelleri Blume) Bina Rizki Amalia; Nunung Harijati; Retno Mastuti
Natural B, Journal of Health and Environmental Sciences Vol 2, No 3 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

The aim of this research was to know the effects of nitrogen fertilizer to the shape and density of calcium oxalate (CaOx) crystals in porang tuber. Bulbil derived from porang plant in the first growth period seeded until the leaves fully open. Seedlings were transferred to a polybag after most of them has height 50 cm. After adapting for three weeks, the plants were treated with nitrogen fertilizer (urea) with a dose 0, 1, and 5 g/polybag. The plants were grown until the end of the growing period. The slides were prepared by slicing tuber as thin as possible using a sliding microtome. Sliced tuber of porang were cleared by using the modified clearing method. The slides were observed using light microscope to calculate the density of CaOx crystals. The densities of calcium oxalate crystals were analyzed using ANOVA (α = 0,05). The results showed that porang tuber has four kind of crystals i.e. raphide, druse, stiloid, and prism. Nitrogen fertilization had no significant effect on the densities of calcium oxalate crystals.

Estimation of 2½ Dimensional Surface Structure in Kelud Volcano Region Based on Gravity Survey M. Rahman; Sunaryo Sunaryo; Adi Susilo
Natural B, Journal of Health and Environmental Sciences Vol 2, No 3 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

The research in the area around Kelud Volcano based on gravity survey has been conducted in order to determine subsurface structure and constituent composition. The research was done in July 2012 - May 2013 in the area around Kelud Volcano covered Blitar, Kediri, Wlingi, and Ngantang. In this research, the equipment that been used is gravity-meter Lacoste & Romberg type G-105. Analysis of data from field measurements performed with the followed step: calculated the correction of Bouguer anomaly, projected to the flat plane and separated regional anomaly and residual anomaly with polynomial fitting method. Interpretation was performed on three cross sections: section AB, CD, and EF. For results of cross-section AB, the values of ρ for andesite, lava, basalt and sandstone are 2.61 gr/cm3, 3.1 gr/cm3, 2.99 gr/cm3 and 1.61 gr/cm 3respectively. For cross-section CD, the values of ρ for andesite and sediment are 2.5 gr/cm3and 2.38 gr/cm3. For cross-section EF, the values of ρ for basalt, sandstone, and sediment are 2.85 gr/cm3, 1.6 gr/cm3, and 2.4 gr/cm3. From the results of models shows that basalt and andesite rocks is dominant in the region of Kelud Volcano.

Prediction of Structure Pouch Magma Volcano Kelud Gravity Data Based Method Using Equivalent Point Mass Sandy Vikki Ariyanto; Sunaryo Sunaryo; Adi Susilo
Natural B, Journal of Health and Environmental Sciences Vol 2, No 3 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

The observation has been done by gravity method on the date of 1 July to 12 August 2012 in the Kelud volcano area, Pare, Kediri, Blitar and Ngantang in order to determine the structure of magma pocket. Data analisis from field measurements performed with the following correcting the data includes: convert to mgal, drift correction, tidal correction, latitude correction and topography correction, then obtained a complete Bouguer anomaly values. Subsequently projected onto a flat surface (Damnpey) by using matlab program and resolve regional anomalies with anomaly residual. Qualitative interpretation is done by reading the complete Bouguer anomaly contour pattern, while the quantitative interpretation is done by creating a 2D cross section on the four A-A’, B-B’, C-C’, and D-D’ lines.Based on projection to the flat surface (Dampney) with equivalent field depth of 3500 and equivalent field height of 200 obtained convergent anomaly contour so that anomaly values become stable, based on quantitative interpretation 2D cross section model of A-A’, B-B’, C-C’ and D-D’ lines and describing structure of magma pocket. Slice anomali density contrast of A-A’ at -2,930 gr/cm3 assumed as magma chamber with 900 meter dept while B-B’ slice at -2,910 gr/cm3assumed as magma chamber with 943 meters dept, C-C’ slice at -2,930 gr/cm3 assumed as magma chamber with 914 meters depth, and D-D’ slice at -2,930 gr/cm3 assumed as magma chamber with 943 meters depth.

Monte Carlo Simulation to Determine Deposition Ratio of Dosage in a-SI Epid with Dose Deposition on Water Herwiningsih, Sri; Rianto, Sugeng; Yuana, Firdy
Natural B, Journal of Health and Environmental Sciences Vol 2, No 3 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

The study aimed to explore the use of a-Si EPID as a dosimeter for IMRT delivery. The main objective of the study was to determine the ratio of dose deposited in a-Si EPID and the dose deposited in water. Linac used in the simulation was Electa Precise Linac and A-Si EPID model used in the study was based on the configuration of iView GT Elekta a-Si EPID. Study the characteristic of energy deposition at a-Si EPID and water detector shows that the energy deposition at a-Si EPID detector is higher than that of water detector at low photon energy (<0.1 MeV). This is caused by an enhancement of photoelectric interaction between photon beam and a-Si EPID detector at low energy X-rays. The simulation of dose deposition by using square fields show that the ratio between the dose deposition of a-Si EPID and the dose deposition of water detector (Î±) increases with an increase of the field size. The value of Î± ranges from 0.60 â€“ 0.66. The similar result was shown in the simulation of dose deposition by using IMRT beam, in which the value of Î± ranges from 0.63 â€“ 0.64. The Î± value is useful to relate the measured dose from detector to the equivalent dose of water, which is often used as a reference medium in radiotherapy dosimetry.Â Â

Page 2 of 2 | Total Record : 15

1 2

Filter by Year

2014 2014

Filter By Issues

All Issue Vol 5, No 2 (2019) Vol 5, No 1 (2019) Vol 4, No 4 (2018) Vol 4, No 3 (2018) Vol 4, No 2 (2017) Vol 4, No 1 (2017) Vol 4, No 1 (2017) Vol 3, No 4 (2016) Vol 3, No 3 (2016) Vol 3, No 2 (2015) Vol 3, No 1 (2015) Vol 2, No 4 (2014) Vol 2, No 3 (2014) Vol 2, No 2 (2013) Vol 2, No 1 (2013) Vol 2, No 1 (2013) Vol 1, No 4 (2012) Vol 1, No 3 (2012) Vol 1, No 2 (2011) Vol 1, No 1 (2011) Vol 1, No 1 (2011) More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kota malang,

Jawa timur

INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name -

Contact Email -

Phone -

Journal Mail Official -

Editorial Address -

Location Kota malang, Jawa timur INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kota malang,

Jawa timur

INDONESIA