This study has the aim to describe the thinking process of students in constructing of exponential concept through problem posing. In this study constructivism through the problem posing in question is a process to assist students in developing mathematical concepts and principles with their own abilities through the process of obtaining information and also the information processing process for later making problems by students. This research type are descriptive research with a case study form using a qualitative approach. This research was conducted on the tenth grade Vocational students in the field of Computer and Network Engineering expertise with a total of ten students. The method of data collection well done through interviews, written tests, observations, and documentation. The data validation used by researchers was triangulation using the source triangulation type. The results of the study show that the construction of the exponential concept is influenced by the thinking of students process when they concept process through posing problem.
This work presents depositional and structural model of Plio-Pleistocene delta of southern Central Graben offshore basin of Netherlands, based on seismic reflections and well logs tools. The studied interval of the Plio-Pleistocene delta is divided into 5 seismic super units, 11 seismic units, and 24 seismic subunits. Seismic reflections were correlated with the wire line records that lead to identification of depositional sequences and parasequences. The seismic units contain 27 well log units interpreted as depositional sequences. Each depositional sequence in term is composed of component parasequences corresponding to progradational and aggradational/retrogradational systems tracts. The main regional interpreted units can be correlated with the regional seismo-stratigraphy, chrono-eustatic and chronostratigraphy. Other previous works show that the Mid-Miocene to top Pleistocene interval is divided regionally into 13 seismic units and 18 log units. Coastline shifting and the sediment supply direction through Plio-Pleistocene time have been detected by lateral changes in clinoform geometry captured via construction of seismic unit's time structure maps. Seismic super unit and seismic unit boundaries have been delineated by onlaps, downlaps, toplaps, truncations of seismic reflectors, which show the significant landward and basinward shifting of coastline. Boundaries of seismic subunits are marked on the basis of depositional cycles. Depositional cycles are characterized on the basis of gamma ray log trends (funnel shape, bell shape, and cylindrical shape) and their associated geometry of parasequences (lowstand, transgressive, and highstand, systems tracts). This work results in a sequential and geometric characterization of the defined deep-seated sedimentary units. It provides a better comprehension of the sedimentary, eustatic, and geodynamic evolution of the North Sea domains, and consequently a better evaluation of its economic interests.
Hydrological and climatological parameters in several locations on peatlands in South Sumatra have been measured directly by a system called Sensory data transmission Service Assisted by Midori Engineering laboratory (SESAME). The parameters are rainfall, temperature, soil moisture, and groundwater level. This research has studied the groundwater level fluctuations and looks for the correlation between groundwater level and soil moisture in four locations, namely Saleh River 1 (SR1), Saleh River 2 (SR2), Lumpur River 1 (LR1), and Lumpur River 2 (LR2). The results are expected to be useful for fire disaster mitigation on peatlands, especially in South Sumatra. Based on time series data of groundwater level, the results show that there has been a sharp decrease in groundwater level at locations SR1, SR2, and LR1. The statistic calculation results show that groundwater level has a significant correlation with soil moisture in four study sites. The correlation coefficients obtained for SR1, SR2, LR1, and LR2 are r = 0.88, 0.97, 0.87 and 0.92, respectively.
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