The analysis of water yield is conducted to provide information on the availability of water resources at a particular location in a watershed. Kedungbulus watershed is located in an area with plantation of pine forest. The pine forest area varies from 7% to 95% of the sub watershed areas. The plantation of this kind of vegetation (Pinusmerkusii) in some regions may cause water availability problem due to it may consume much more water rather than others. The objective of this study is to analyze the effect of pine forest area and its characteristics on the water yield in several of sub watershed at Kedungbulus Watershed. Direct measurement and prediction were used to estimate the water yield. A Thorthwaiteand Mather method was used in this study to estimate the water yield. It was completed with data of rainfall, air temperature, soil properties, and land cover. Stand density varies from 388 to 644 stand/hectare and diameter at breast height (DBH) varies from 20 to 40 cm. The annual rainfall during the year of 2015 at the location was 2525 mm. It was found that the water yield tends to decrease with the increase of pine forest area. The water yield of the watershed with pine forest covered with 7% was 1520 mm/year, while watershed with pine forest covered 95% was lower (1289 mm/year). In order to increase the water yield, the pine forest plantation is not recommended in a certain area with low rainfall. Modified Thorthwaite-Mather Water Balance method was successfully applied to this case with a significant increase in determination coefficient from 0.3 to 0.7.
Tedhak Siten is a Javanese traditional ceremony that marks the 8th month of the baby’s age, marked by the baby's readiness to set foot on the ground. This tradition has a philosophical meaning with Javanese cultural values related to the concepts of calculating the ceremony time and the geometric shape of the ceremonial equipment used. The purpose of this study was to explore the cultural activities of the Javanese community by outlining the mathematical concepts contained in the implementation of the Tedhak Siten ceremony. This research was a qualitatively descriptive study through an ethnographic approach. Ethnomathematical data were collected from two experts those were the head of a traditional Javanese culture studio and a cultural actor active as a leader of Javanese traditional ceremonies. The ethnomathematics found in the study were counting the date or time for the implementation of the Tedhak Siten tradition and the elaboration of geometric concepts in the form of ceremonial equipment used to perform traditional customary procedures. This research had an impact as a mathematics learning material that originated from the wisdom of the local Javanese community by applying the concepts of time units, least common multiples, modulo 5, modulo 7, circles, triangles, rectangles, cylindrical volumes and spherical volumes.
The purpose of this study is to describe the problems of using digital-based innovative learning media in the digitalization era which is an independent learning program in basic education. This problem is very important to study more deeply, considering that learning media is an important component that must exist in the implementation of learning. The method used in this research is descriptive qualitative. The research was conducted at SDN Sidosermo 1 Surabaya during December 2022. The data needed in this study included literature studies, direct observation, supported by questionnaire results and interviews with PPG students who carried out PPL at SDN Sidosermo 1 Surabaya. The results of this study note that there are still teachers who have not utilized digital-based innovative learning media during learning. Teachers still use the lecture method and simple media in the form of pictures and word cards to support learning. The lack of use of digital-based innovative learning media is not only seen in Sidosermo 1 Surabaya Elementary School, but also in several schools in Indonesia. This is known from data which states that around 60% of teachers in Indonesia still do not master information and communication technology. Based on the results of this study it can be concluded that the use of digital-based innovative learning media is still minimal and needs to be improved in the future. It is intended that there is a balance between technological advances and scientific advances in the school environment, which in turn can improve the quality of learning
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