The identification of iron ore distribution in Pancuma village, Tojo district using geoelectric resistivity Method

The identification of iron ore distribution under surface in Pancuma village, Tojo district, using the geoelectric resistivity of schlumberger configuration has been conducted. Results of the data processing at 6 estimation points in study area using Progress software indicate that the estimated layer type contained iron ore which had the resistivity values of 50.5 Ωm–80.8Ωm with the maximum layer thickness of 50.1 m and the minimum layer thickness of 0.7 m. The distribution of the estimated layers has thicker layer in southern part and thinner layer in northern part in study area. Key Words: Geoelectric, Resistivity, Progress software, Iron ore

Identification the distribution of iron ore used resistivity geoelectric method in the Ogowele Village, Tolitoli Regency.

It has been used resistivity geoelectric method with Wenner-Schlumberger configuration. The aim is to identify the distribution of iron ore located in the Ogowelevillage, Tolitoli regency. Research has been done using geoelectric method Wenner-Schlumberger configuration as well as data processing and data modeling using software EarthImager 2D in the 2D cross-sectional shape. Based on 2D modeling results resistivity value of the iron ore ranging from 55.8 to 156.2 Ωm. The existence of iron ore largelyspreadin South, West and East sites.Keyword: geoelectric, resistivity, EarthImager 2D, iron or

Groundwater investigation Geolistrik Methods In Regional District of Parigi Parigi Moutong

The research of groundwater investigation conducted by applying the method of geoelectric in the District Parigi Parigi Moutong. Identification of the substance of the study, conducted by survey / observations and measurements in the field.Field measurements using elektrical Vertical Sounding (VES) with Schlumberger electrode configuration. The results obtained indicate that the groundwater aquifer layer in the study area are the two lithologies are lithologies alluvium and coastal sediment and rock units molasa celebes. In the alluvium and coastal sediment units are at least 3 layers of the aquifer from surface to a depth of ± 25m bmt where perlapisannya alternating with layers aquiclude. Distribution of the aquifer layer on a flat stone units tend to follow the surface topography. In lithologies molasa celebes obtained their aquifer layer that is as aquifer (+). The upper limit of this layer is at a depth ±24.6m bmt decreases eastward at a depth ±40.2m bmt. The thickness of this layer is the average ±42m. allegedly sumurbor positive groundwater measuring point 16, 17 are located in the region kampal, 23 (Maesa), 24 (Mertasari), 30 (Bambalemo) and 35 (Maesa Coast) derived from this aquifer layer. Parigi district region is an area of discharge (discharge area), while the catchment area (recharge area) is located in the west area of research. Keywords: groundwater, geoelectric method, the method vertial Eletrrial Sounding, Schlumberger configuratio

Determination ofCoherenceandPhaseDifferencebetween Wind versus Current60 mand Current 60 mversusCurrent 100 mUsingCrossCorrelation in OmbaiStrait, East Nusa Tenggara

Abstract   Data analysis was performed to see coherence and phase difference between the wind versus current 60 m and current 60 m versus current 100 m using cross correlation in Ombai Strait, East Nusa Tenggara. Velocity components U and V of wind and current of wind data and the current were filtered in order to obtain new data on the initial data at any position of t from xt-n  to xt+n. Energy spectrum density of the filter result is determined to examine the fluctuations of wind energy and real currents. Cross-correlation between wind versus current 60 m and current 60 m versus current 100 m is to determine the coherence and the phase difference of the data with the same time interval. Low coherence values in the cross-correlation between the Zonal Wind and the Zonal current at a depth of 60 m indicates that the fluctuations between the Zonal Wind and the zonal current depth of 60 m does not have a strong correlation with the largest coherence value that is 0.55 with a time leg 34 days. With fluctuation current at a depth of 60 m precedes wind fluctuation with a phase difference of 34 days. Keywords: coherence, phase difference, Ombai Strai

Accuracy and Automatic Computation of Seismic Refraction: a case of Forward Modeling and Inversion

It has been built a data processing program to perform the first arrival waktu tempuh inversion of seismic refraction profiles zero distance. Analysis of the first wave arrival time is obtained by 1) using two-way analysis of time-taking to control the accuracy of the passage and identify the mistakes geometry,, 2) parameterization slowness and intercept-time of travel-time, in which the velocity model and multi-layer thickness obtained by inversion LSQ method (unconstrained, constrained and Marquardt) on seismic refraction. For automatic calculation and accurate, we make a data processing program for the third inversion LSQ method. Analysis of the model resolution and measurement data to determine the optimal parameters of the model, the algorithm used Menke (1989). Resolution inversion results, we tested with: forward modeling, the level of misfit (error) and the convergence between the observed data and the model. Once the program is successfully tested on a number of data, then we apply to the real seismic. The results of field data inversion interpreted that the subsurface strata bedding row from the top (first layer) in the form of: soil, sand (loose), sand (saturated, loose) and sandstone, limestone. Resolution velocity and thickness in the forward modeling program: a) the error between: 10-17 - 10-5 and b) the residue of convergence is: 10-11-10-4, while the resolution of the results of the third inversion LSQ method on the field data, obtained misfit between: 10-17 - 10-4 and residual convergence between measurement data and the model are: 10-11 -10-4.Keywords —seismic refraction, forward modeling, LSQ inversion, parameter models, resolution

Plant Watering System Design Using Soil Moisture Automatic Sensor Microcontroller Based Sen0057 ATmega328P

It has been designed and created a plant watering system that is expected to help watering plants from a manual system to an automated system. The watering system is designed for watering plants at the right time and humidity. This tool utilizes SEN0057 soil moisture sensors to detect the level of soil moisture and ATmega328P microcontroller as the main controller. This tool is also used as a stop relay contact or disconnect from the current to flow to the pump, the LCD to display the time and the level of soil moisture and pump to drain the water. The working principle of this device when the sensor detects kelambaban ground level is less than the pre-defined limit, the microcontroller will command the process of watering until the soil moisture value equal to or greater than the pre-defined. Pepper plants as objects of research have suitable soil moisture ranging from 50% - 60%. Thus limits for soil moisture for plant watering is 3:38 volts. Watering the plant is operated at 5:45 pm and 17:45 pm.Keywords: Soil Moisture Sensor SEN0057, ATmega328P, Relay

A Study of the Effect of Thermal Annealing on the Morphology of Copper Foils as Catalyst for Graphene Growth

Telah dilakukan penelitian tentang pengaruh “thermal annealing†terhadap morphology pada tembaga (Cu) sebagai katalis penumbuh graphene.Penelitian ini bertujuan untuk menemukan suatu kondisi optimal untuk mempersiapkan katalis tersebut pada penumbuhan graphene.Dalam penelitian ini, foil tembaga telah diteliti dengan memvariasikan suhu annealing, waktu annealing dan laju gas hydrogen. Dari hasil penelitian didapatkan bahwa kondisi optimal adalah annealing pada suhu 900 oC selama 10 menit dengan laju aliran hydrogen sebesar 100 sccm. Selain itu, penelitian “pre-thermal annealing†telah juga dilakukan untuk menguji perubahan sifat-sifat struktur dan morphology tembaga tersebut.Dari hasil penelitian ditemukan bahwa tembaga tersebut memiliki “nanocrystalline cubic structure†yang baik, di mana didominasi oleh (100) dengan ukuran crystal ~200 nm.Penelitian ini juga menunjukkan bahwa gas hydrogen efektif dalam mereduksi impurity dari oksidasi tembaga.Dan juga, annealing pada suhu 900 oC ke atas, sampel tersebut memiliki morphology yang halus pada seluruh permukaannya dan grain-grain berukuran ~ 88 µm. Kata kunci : Foil tembaga, Thermal annealing, Ukuran crystal,  and Ukuran grain