Geoelectrical Resistivity and Hydrogeochemical Contrast Between the Area That Has BeenApplied with Fertilization for Long Duration and Non-Fertilization

Integrated geoelectrical resistivity, hydrogeochemical and soil properties analysis methods were used to study the area that has been applied with fertilization for long duration and non-Fertilization in Machang, North Kelantan. The Machang plain is covered with Quaternary fluvial sediments overlying granite bedrock. The drainage system is dendritic with the main river flowing into the South China Sea. In this study, the area was divided into two sites. Site-1 is the non-fertilized site, and Site-2 is the regularly-fertilized site. At shallow depth from the surface to depths of 75 cm a lower average geoelectrical resistivity values were obtained from the regularly fertilized site which has not been fertilized for the last ten months prior to the survey. The average resistivity values were around 0.366 times less in unfertilized sites. Residual nitrate and chloride were still present at the regularly chemically fertilized sites. At sites where no chemical fertilizer was added, the nitrate and chloride concentration were also found. These are due to the faces excretion of from the farm animals. The presence of nitrate and chloride content in pore water reduced the resistivity values. Thus despite low moisture content, the resistivity values to remain low. Normally, resistivity values are inversely proportional to moisture content for area with similar soil condition

Geoelectrical Resistivity Method for Salt/brackish Water Mapping

A 2D geoelectrical resistivity method was used for detecting and mapping occurrence of salt/brackish water in the subsurface, North Kelantan - Malaysia. The North Kelantan plain is covered with Quaternary sediments overlying granite bedrock. The drainage system is dendritic with the main river flowing into the South China Sea. The geoelectrical resistivity surveys made up of eleven resistivity traverses at four different sites. The zone of brackish water is very clearly seen in the resistivity inverse model with position around 20-30 m depth. This aquifer is referred to second aquifer. As the final result, a map with the possibility of salt/brackish and fresh water interface can be generated

Demonstration of the Google Earth as a Tool in Learning the Earth Physics

Earth Physics is a course at the Physics Education Program Study, University of Riau, Indonesia. The problem facing by students were the student commonly not able to imagine the rotation effect and the tilt of rotation axis to some phenomenon. Furthermore the students were difficult to imagine the subduction zone of two tectonic plates. This study was demonstrate some assignments to the student regarding the use Google Earth in the learning the earth physically. In this study, a total of 38 students were chosen to use the Google Earth as an interactive learning media. To demonstrate the Google Earth in the learning process, several assignments have been given to the students. The first was to compare the distance measurement manually and through Google Earth. The second demonstration was to define some selected areas. The third was to demonstrate the tilt axis of rotation effect on the earth. The last was a mini project to demonstrate the use of Google Earth in imagine of the subduction of two tectonic plates. The result shows that mostly students (92%) were able to reconstruction the process involved in the assignment although a few of them cannot explain well. Whilst, 8% of the student were still difficult to reconstruction the process involved in the assignment, although they can submit all the assignments with fairly well. Finally, the Google Earth is generally success used in the demonstration of earth physics subject learning media

Evaluation of the Fate of Nitrate and Analysis of Shallow Soil Water Using Geo-electrical Resistivity Survey

Evaluation of the fate of nitrate and analysis of shallow soil water in a tobacco plantation area were conducted using integration of soil properties and hydrogeochemical analysis, and geo-electrical resistivity methods, taking measurements four times within a three-month period. The sampling data were taken in two areas: a fertilized and a nonfertilized zone. Chemical fertilizer was introduced to the fertilized zone after the first data acquisition. Hydrogeohemical analysis of the soil water was conducted from the surface to a depth of 1 m at an interval of 25 cm. The results show that the cations in the soil water were quite comparable for each monitoring time. Conversely, relatively larger changes in anion content occurred at the surface until a depth of 1 m. In particular, the nitrate concentration reached its maximum level at about 67 days after fertilization and returned to its initial value approximately 195 days after fertilization. The geo-electrical resistivity profiles exhibited no indication of low resistivity values prior to fertilization near the surface. However, lower resistivity values were found in the fertilized zone at the second and third measurement. The result shows that the adjoining environment dissolved the nitrate concentration in the pore soil within the three-month time period

The Development of Learning Media for the Kinetic Theory of Gases Using the ADDIE Model with Augmented Reality

For senior high school students, learning concepts in physics is increasingly more difficult when the topic is abstract and cannot be seen with the unaided eye. The research here utilized augmented reality technology and instructional design following the ADDIE model (analysis, design, development, implementation and evaluation) to develop learning media for physics, specifically the kinetic theory of gases. Preliminary analysis was conducted in a senior high school to evaluate the challenges students face when learning physics. The design of the media was based on addressing problems that the students were having. Augmented reality technology was then utilized and the implementation aimed to incorporate the physics concepts into the product. The media was evaluated by six experts. Finally, the learning media presented real-time 3D animation of gas kinetic theory with three basic competencies relevant to the topic. In the final validation, the results indicated that the developed learning media had a validity value of 3.55 out of four-point scale and good quality outcomes. As such, the developed media regarding the kinetic theory of gases is valid and effective for the process of learning and teaching. It is ready to be tested and used in actual learning environments

Reaksi Pasar Modal Indonesia Terhadap Pergantian Menteri Keuangan (Event Study Saham Yang Terdaftar Di Bei)

Information is the main needs of investors in capital markets. Sri Mulyani setback Event of the positions for the finance minister who has information content relevant to investors will cause the market reaction reflected through changes in stock prices and trading activity. This reaction can be measured by indicators of Abnormal Return (AR), Trading Volume Activity (TVA) and Security Return variability (SRV). This research is a study of events that aims to find empirical evidence for the existence of the Indonesian capital market reaction to the events of Sri Mulyani setback from the office of finance minister. The population in this study is that all stocks listed on the BEI. While the sample taken through purposive sampling technique of shares - shares that are included in LQ45 corporate action and do not perform during the event period. One sample t-test (one sample t-test) was used to analyze whether the AR, TVA, and SRV significant value on the day - the day around the occurrence of events that prove the existence of market reaction. TVA and AR significant at the time of announcement of events shows that the market reacted to the setback Sri Mulyani finance minister from office. However, the SRV is not significant at the time of announcement of events shows that the market reaction that occurs there is an uneven distribution of information and influence the distribution of stock retur

Penerapan Metode Pembelajaran Pictorial Riddle Terhadap Motivasi Belajar IPA Fisika Siswa Kelas VIII SMP Beer Seba Pekanbaru

The aim of this research is to describe the learning motivation of physics science with implementation of Pictorial Riddle. This type of research is a quasi-experimental, with a one-shot case study design. Samples in this research is all student of VIII B classes with total of 25 students. The instrument of data in this research is a ARCS motivation questionnaire. Analysis of the data in this study was a descriptive analysis that was used to view the category maotivation on learning physics science with the of use keller motivation formula. The analysis data shows score of students motivation are 5,33 with good category. Therefore, it can be concluded that implementation of Pictorial Riddle Learn Method can be used as an alternative method in the learning process in the classroom VIII SMP Beer Seba Pekanbaru