Pub Date : 2022-10-17DOI: 10.22487/25411969.2022.v11.i01.15812
Apridio Faiz An Nabil, Irsya Emilia Putri, D. Ariyanti, E. Saputro
The increasing demand for energy in transportation, industry, and domestic activities around the world is the starting point of the industrial revolution that has an impact on the emergence of environmental problems. The innovation of processing waste into alternative energy sources is an idea that has good potential in overcoming dependence on conventional energy sources. Processing plastic waste into alternative fuels in the form of plastic briquettes, including tertiary recycling. Converting plastic waste into alternative fuels can be done using several variations of methods and variations of adhesive materials. On carbonization only produces one type only. Plastic briquettes (PP) can produce a higher heating value of 9982.779±240.017 cal/gram and 3.90% ash content. From plastic briquettes (PET) 7024.56 cal/gram and 0.27% ash content but also produces a high ash content, this is because there are still impurities in it. Meanwhile, for the type of adhesive with the same composition as briquettes with starch adhesive, the heat value was 6328 kcal/kg, arpus 6366 kcal/kg. Although the calorific value is higher, the arpus adhesive usually tends to produce briquettes with black smoke, this is due to the composition of the arpus which is made from rubber tree sap.
{"title":"Review of Recycling Plastic Waste into Briquettes","authors":"Apridio Faiz An Nabil, Irsya Emilia Putri, D. Ariyanti, E. Saputro","doi":"10.22487/25411969.2022.v11.i01.15812","DOIUrl":"https://doi.org/10.22487/25411969.2022.v11.i01.15812","url":null,"abstract":"The increasing demand for energy in transportation, industry, and domestic activities around the world is the starting point of the industrial revolution that has an impact on the emergence of environmental problems. The innovation of processing waste into alternative energy sources is an idea that has good potential in overcoming dependence on conventional energy sources. Processing plastic waste into alternative fuels in the form of plastic briquettes, including tertiary recycling. Converting plastic waste into alternative fuels can be done using several variations of methods and variations of adhesive materials. On carbonization only produces one type only. Plastic briquettes (PP) can produce a higher heating value of 9982.779±240.017 cal/gram and 3.90% ash content. From plastic briquettes (PET) 7024.56 cal/gram and 0.27% ash content but also produces a high ash content, this is because there are still impurities in it. Meanwhile, for the type of adhesive with the same composition as briquettes with starch adhesive, the heat value was 6328 kcal/kg, arpus 6366 kcal/kg. Although the calorific value is higher, the arpus adhesive usually tends to produce briquettes with black smoke, this is due to the composition of the arpus which is made from rubber tree sap.","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129526029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-31DOI: 10.22487/25411969.2021.v10.i02.15673
Reymon Reymon, Suhikma Sofyan, A. W. Yodha, Musdalipah Musdalipah
Meistera chinensis is a species that belong to the Zingiberacea family. In Southeast Sulawesi, a population of Meistera chinensis was found in the Abuki forest of Konawe Regency. Empirically, its consumed by the community as a cooking spice and body fitness. The results of previous research revealed that Meistera chinensis fruit is efficacious as an antioxidant, anticancer, antimicrobial and antifungal. Research on the rhizome has never been done. This study aims to determine the potential for toxicity and the LC50 value of Meistera chinensis rhizome using the BSLT method. The rhizomes were extracted with 96% ethanol and concentrated using a rotary evaporator. Then fractionation was carried out with methanol and ethyl acetate as solvents. The concentration of the rhizome fraction was 7.81 ppm, 15.63 ppm, 32.25 ppm, 62.5 ppm, 125 ppm, 250 ppm, 500 ppm and 1000 ppm. Positive control used of 1.4 mg potassium bichromate and negative control is DMSO. Toxicity was determined based on the mortality of shrimp larvae and calculated by determining the LC50 value. The results showed that the LC50 values for the methanol, ethyl acetate and positive control fractions of Meistera chinensis rhizome were 252.88 mg/L, 57.17 mg/L, and 6.22 mg/L, respectively. Based on these results, it can be concluded that the Meistera chinensis rhizome fraction has a toxic effect on shrimp larvae (≤1,000 mg/L).
{"title":"The toxicity of Meistera chinensis rhizome fraction by shrimp larvae with the BSLT method","authors":"Reymon Reymon, Suhikma Sofyan, A. W. Yodha, Musdalipah Musdalipah","doi":"10.22487/25411969.2021.v10.i02.15673","DOIUrl":"https://doi.org/10.22487/25411969.2021.v10.i02.15673","url":null,"abstract":"Meistera chinensis is a species that belong to the Zingiberacea family. In Southeast Sulawesi, a population of Meistera chinensis was found in the Abuki forest of Konawe Regency. Empirically, its consumed by the community as a cooking spice and body fitness. The results of previous research revealed that Meistera chinensis fruit is efficacious as an antioxidant, anticancer, antimicrobial and antifungal. Research on the rhizome has never been done. This study aims to determine the potential for toxicity and the LC50 value of Meistera chinensis rhizome using the BSLT method. The rhizomes were extracted with 96% ethanol and concentrated using a rotary evaporator. Then fractionation was carried out with methanol and ethyl acetate as solvents. The concentration of the rhizome fraction was 7.81 ppm, 15.63 ppm, 32.25 ppm, 62.5 ppm, 125 ppm, 250 ppm, 500 ppm and 1000 ppm. Positive control used of 1.4 mg potassium bichromate and negative control is DMSO. Toxicity was determined based on the mortality of shrimp larvae and calculated by determining the LC50 value. The results showed that the LC50 values for the methanol, ethyl acetate and positive control fractions of Meistera chinensis rhizome were 252.88 mg/L, 57.17 mg/L, and 6.22 mg/L, respectively. Based on these results, it can be concluded that the Meistera chinensis rhizome fraction has a toxic effect on shrimp larvae (≤1,000 mg/L).","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127968353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-31DOI: 10.22487/25411969.2021.v10.i02.15635
E. Yazid, A. Wafi, Siti Maryaningsih
Waste cooking oil is cooking oil that has been used to fry food ingredients repeatedly. Cooking oil heated at high temperatures will be damaged to produce peroxide compounds that accelerate the process of developing a rancid odor, reducing the quality of the oil and the nutritional value of fried foods. The research was conducted by the spectrophotometric method using a wavelength of 200-300 nm. Based on the results of the study, the addition of 0.5 g, 1.0 g, 1.5 g and 2.0 g of banana midrib adsorbents obtained peroxide concentrations of 0.031%, 0.033%, 0.034%, and 0.034% respectively. The addition of water hyacinth adsorbent successively obtained 0.035%; 0.038%, 0.039%, and 0.038%. The largest percentage decrease was found in the addition of banana midrib adsorbents, namely 38% and water hyacinth 30%. From the independent T-test statistical test, it was obtained that p<0.05 was significant, so it can be concluded that there was a decrease in peroxide concentration in the addition of banana midrib and water hyacinth adsorbents to waste cooking oil Keywords: Adsorbent, Waste cooking oil, Peroxide, Banana midrib, water hyacinth.
{"title":"Determination of peroxide by spectrophotometry in waste cooking oil using adsorbents from banana midrib and water hyacinth","authors":"E. Yazid, A. Wafi, Siti Maryaningsih","doi":"10.22487/25411969.2021.v10.i02.15635","DOIUrl":"https://doi.org/10.22487/25411969.2021.v10.i02.15635","url":null,"abstract":"Waste cooking oil is cooking oil that has been used to fry food ingredients repeatedly. Cooking oil heated at high temperatures will be damaged to produce peroxide compounds that accelerate the process of developing a rancid odor, reducing the quality of the oil and the nutritional value of fried foods. The research was conducted by the spectrophotometric method using a wavelength of 200-300 nm. Based on the results of the study, the addition of 0.5 g, 1.0 g, 1.5 g and 2.0 g of banana midrib adsorbents obtained peroxide concentrations of 0.031%, 0.033%, 0.034%, and 0.034% respectively. The addition of water hyacinth adsorbent successively obtained 0.035%; 0.038%, 0.039%, and 0.038%. The largest percentage decrease was found in the addition of banana midrib adsorbents, namely 38% and water hyacinth 30%. From the independent T-test statistical test, it was obtained that p<0.05 was significant, so it can be concluded that there was a decrease in peroxide concentration in the addition of banana midrib and water hyacinth adsorbents to waste cooking oil \u0000Keywords: Adsorbent, Waste cooking oil, Peroxide, Banana midrib, water hyacinth.","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134108095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-31DOI: 10.22487/25411969.2021.v10.i02.15542
Tung T. Nguyen, Dung Ngoc Thai, Y. T. Trang, Vy T Duong
The species M. saigonensis (Omodeo, 1956) was re-accessed based on a comparison between its original description and different variations of M. bahli and M. peguana. A total of 65 specimens of M. bahli and 69 specimens of M. peguana collected from various parts in southern Vietnam were used to examine. As a result, M. bahli has two different morphs (with and without concave male region). M. peguana has two subspecies, but rather stable in morphology. M. saigonensis is totally different from M. peguana in closer ventral distance between male pores, spermathecal pores, but it is very similar to the morph 2 of M. bahli. Therefore, it is concluded that M. saigonensis is a junior synonym of M. bahli.
{"title":"Taxonomic status ot the earthworm species Metaphire saigonensis (Omodeo, 1956) (Clitellata: Megascolecidae)","authors":"Tung T. Nguyen, Dung Ngoc Thai, Y. T. Trang, Vy T Duong","doi":"10.22487/25411969.2021.v10.i02.15542","DOIUrl":"https://doi.org/10.22487/25411969.2021.v10.i02.15542","url":null,"abstract":"The species M. saigonensis (Omodeo, 1956) was re-accessed based on a comparison between its original description and different variations of M. bahli and M. peguana. A total of 65 specimens of M. bahli and 69 specimens of M. peguana collected from various parts in southern Vietnam were used to examine. As a result, M. bahli has two different morphs (with and without concave male region). M. peguana has two subspecies, but rather stable in morphology. M. saigonensis is totally different from M. peguana in closer ventral distance between male pores, spermathecal pores, but it is very similar to the morph 2 of M. bahli. Therefore, it is concluded that M. saigonensis is a junior synonym of M. bahli.","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131215598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-31DOI: 10.22487/25411969.2021.v10.i02.15622
Dede Arseyani Pratamasyari
Forecasting is a method for estimating a value in the future by looking at data in the past. In this study, the author will discuss the results of forecasting the price of the Islamic stock index using a backpropogation artificial neural network. The results show that the forecasting value of the stock closing price at ISSI for the next 1 period April 2018 is an average of 192,6842. After getting the forecast value, then it is compared with the actual average data, which is 185.4748. the amount of error generated greatly affects the number of inputs and the selection of the right network architecture pattern. Keywords: Prediction, Backpropogation, ISSI
{"title":"Forecasting of stock prices on the Indonesian Sharia Stock Index (ISSI) using backpropogation artificial neural network","authors":"Dede Arseyani Pratamasyari","doi":"10.22487/25411969.2021.v10.i02.15622","DOIUrl":"https://doi.org/10.22487/25411969.2021.v10.i02.15622","url":null,"abstract":"Forecasting is a method for estimating a value in the future by looking at data in the past. In this study, the author will discuss the results of forecasting the price of the Islamic stock index using a backpropogation artificial neural network. The results show that the forecasting value of the stock closing price at ISSI for the next 1 period April 2018 is an average of 192,6842. After getting the forecast value, then it is compared with the actual average data, which is 185.4748. the amount of error generated greatly affects the number of inputs and the selection of the right network architecture pattern. \u0000 \u0000Keywords: Prediction, Backpropogation, ISSI","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131338591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-31DOI: 10.22487/25411969.2021.v10.i02.15648
Fadjryani Fadjryani, Nur Sakinah Lombang
Poverty is a human inability to meet the needs of life. Factors that affect poverty can be seen from various indicators. In this study, the path analysis method was used to analyze the factors that directly and indirectly influence poverty in Sulawesi. The results showed that the number of poor people, the labor force participation rate, the human development index, and the average length of schooling had a direct effect on the poverty depth index. Then, the human development index, the average length of schooling, and the poverty depth index have a direct effect on the poverty level. Then, the human development index and the average length of schooling also indirectly affect the poverty level through the poverty depth index. Keywords: Path Analysis, Poverty Level
{"title":"Analysis of poverty factors in Sulawesi by using path analysis","authors":"Fadjryani Fadjryani, Nur Sakinah Lombang","doi":"10.22487/25411969.2021.v10.i02.15648","DOIUrl":"https://doi.org/10.22487/25411969.2021.v10.i02.15648","url":null,"abstract":"Poverty is a human inability to meet the needs of life. Factors that affect poverty can be seen from various indicators. In this study, the path analysis method was used to analyze the factors that directly and indirectly influence poverty in Sulawesi. The results showed that the number of poor people, the labor force participation rate, the human development index, and the average length of schooling had a direct effect on the poverty depth index. Then, the human development index, the average length of schooling, and the poverty depth index have a direct effect on the poverty level. Then, the human development index and the average length of schooling also indirectly affect the poverty level through the poverty depth index. \u0000Keywords: Path Analysis, Poverty Level","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115124818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-31DOI: 10.22487/25411969.2021.v10.i1.15476
Alfredi Anis Fadhila G.S, W. Darwis, R. H. Wibowo, S. Sipriyadi, R. Supriati
Sembung rambat (Mikania micrantha Kunth.) is a weed whose presence is detrimental to agriculture because it can prevent agricultural plants from absorbing nutrients, water and light for photosynthesis. But behind that it turns out that sembung rambat has various benefits, one of which can be used as an antibacterial. The antibacterial ability of sembung rambat leaves has the potential to be used as a basis for making alternative antibiotics. This study was conducted to determine the value of Minimum Inhibitory Concentration (MIC) and antibacterial acitivity of leaves of sembung rambat (M. micrantha Kunth.) Which is most effective in inhibiting the growth of B. subtilis. The sampling method was done by purposive sampling, the extract was made by maceration with ethanol 96% ratio of 1:10. Test for antibacterial activity using the diffusion disc method. The antibacterial activity test results of 96% ethanol extract of sembung rambat leaves, inhibited the test of the value that was the most effective at inhibiting the growth of B. subtilis at 6 % with a diameter of 4.63 mm. From the results obtained, it can be seen that the leaves extract of sembung rambat has the potential to be used as an alternative plant-based antibiotic
{"title":"Antibacterial Activity of the Ethanolic Extract of Sembung Rambat (Mikania micrantha Kunth) Leaves Against Bacillus subtilis","authors":"Alfredi Anis Fadhila G.S, W. Darwis, R. H. Wibowo, S. Sipriyadi, R. Supriati","doi":"10.22487/25411969.2021.v10.i1.15476","DOIUrl":"https://doi.org/10.22487/25411969.2021.v10.i1.15476","url":null,"abstract":"Sembung rambat (Mikania micrantha Kunth.) is a weed whose presence is detrimental to agriculture because it can prevent agricultural plants from absorbing nutrients, water and light for photosynthesis. But behind that it turns out that sembung rambat has various benefits, one of which can be used as an antibacterial. The antibacterial ability of sembung rambat leaves has the potential to be used as a basis for making alternative antibiotics. This study was conducted to determine the value of Minimum Inhibitory Concentration (MIC) and antibacterial acitivity of leaves of sembung rambat (M. micrantha Kunth.) Which is most effective in inhibiting the growth of B. subtilis. The sampling method was done by purposive sampling, the extract was made by maceration with ethanol 96% ratio of 1:10. Test for antibacterial activity using the diffusion disc method. The antibacterial activity test results of 96% ethanol extract of sembung rambat leaves, inhibited the test of the value that was the most effective at inhibiting the growth of B. subtilis at 6 % with a diameter of 4.63 mm. From the results obtained, it can be seen that the leaves extract of sembung rambat has the potential to be used as an alternative plant-based antibiotic","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"19 18","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120844570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-31DOI: 10.22487/25411969.2021.v10.i1.15452
Dina Asti Prastiwi, Sugito, Puspita Kartikasari
Aircraft are effective transportation compared to land and sea transportation. This causes the growth of demand flow of movement, both passengers and aircraft each time period is always increasing. However, The issues that arise are the issues that arise. Meanwhile, the problems that occur are capacity building. Based on the description above, one example of a queue system that is often encountered in daily life is the transportation service system, for example the plane queue at Ahmad Yani International Airport. Based on observations made while boarding the plane, it is not according to the schedule, which is normal because of the arrival of the plane that is not on time. This causes the airport parking lot to be full or busy and can prevent the arrival of the aircraft. Related to the application of the queue method can overcome the difficulties in standing aircraft parking facilities at Ahmad Yani Airport in Semarang.The results analysis model data of passenger plane queue system at Ahmad Yani International Airport (G / G / 8) : (GD / ∞ / ∞). The non-poisson model of time distribution interval arrivals the normal log and logistic distribution time, servers 8 th queue discipline use FIFO, unlimited service capacity, and unlimited transfer resources
与陆运和海运相比，飞机是一种有效的运输方式。这导致需求流量的增长，无论是乘客还是飞机，每个时间段都在不断增加。然而，出现的问题就是出现的问题。与此同时，出现的问题是能力建设。基于上面的描述，在日常生活中经常遇到的排队系统的一个例子是运输服务系统，例如Ahmad Yani国际机场的飞机排队。根据登机时的观察，没有按照时间表，这是正常的，因为飞机没有准时到达。这会导致机场停车场满员或繁忙，并可能阻止飞机到达。相关的应用排队法可以克服三宝垄阿末亚尼机场常设飞机停放设施的困难。结果分析亚尼国际机场客机排队系统模型数据(G / G / 8):(GD /∞/∞)。非泊松模型的时间分布区间为到达时间的正态对数和物流分布时间，服务器第八队列纪律采用先进先出，服务容量无限，资源无限转移
{"title":"Analysis non-poisson systems cases of queuing passenger aircraft at Ahmad Yani Airport","authors":"Dina Asti Prastiwi, Sugito, Puspita Kartikasari","doi":"10.22487/25411969.2021.v10.i1.15452","DOIUrl":"https://doi.org/10.22487/25411969.2021.v10.i1.15452","url":null,"abstract":"Aircraft are effective transportation compared to land and sea transportation. This causes the growth of demand flow of movement, both passengers and aircraft each time period is always increasing. However, The issues that arise are the issues that arise. Meanwhile, the problems that occur are capacity building. Based on the description above, one example of a queue system that is often encountered in daily life is the transportation service system, for example the plane queue at Ahmad Yani International Airport. Based on observations made while boarding the plane, it is not according to the schedule, which is normal because of the arrival of the plane that is not on time. This causes the airport parking lot to be full or busy and can prevent the arrival of the aircraft. Related to the application of the queue method can overcome the difficulties in standing aircraft parking facilities at Ahmad Yani Airport in Semarang.The results analysis model data of passenger plane queue system at Ahmad Yani International Airport (G / G / 8) : (GD / ∞ / ∞). The non-poisson model of time distribution interval arrivals the normal log and logistic distribution time, servers 8 th queue discipline use FIFO, unlimited service capacity, and unlimited transfer resources","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133863516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-31DOI: 10.22487/25411969.2021.v10.i1.15505
Sabhan Sabhan, Badaruddin, M. Kurniawan, M. Rusydi
The Watusampu Water Coast was one of the waters affected by the tsunami waves on September 28, 2018. The height of the tsunami waves reached 6.6 meters and submerged as far as 71.4 meters inland. This study aims to see the bathymetry and tidal characteristics of Watusampu waters after the 2018 tsunami. The results of bathymetry measurements are corrected with tidal data. The results of tide measurements are compared with the predicted results and then analyzed by T-tide to calculate the tidal constituents used in the calculation of the planned water level in Watusampu waters. The bathymetry depth in the Watusampu waters ranges from 66.5 meters. The slope of the coastal waters has increased from north to south. The type of tide in Watusampu waters is mixed tides with a double daily inclination. The dominant tidal constituents are M2 and S2, respectively, with an amplitude of 0.5336 m and 0.4025 m. The tide wave height at the neap tide and spring tide is 0.2622 and 1.8722 m, respectively.
{"title":"Tidal and bathymetry characteristics after the 2018 earthquake and tsunami in Watusampu Waters, Palu Bay, Central Sulawesi","authors":"Sabhan Sabhan, Badaruddin, M. Kurniawan, M. Rusydi","doi":"10.22487/25411969.2021.v10.i1.15505","DOIUrl":"https://doi.org/10.22487/25411969.2021.v10.i1.15505","url":null,"abstract":"The Watusampu Water Coast was one of the waters affected by the tsunami waves on September 28, 2018. The height of the tsunami waves reached 6.6 meters and submerged as far as 71.4 meters inland. This study aims to see the bathymetry and tidal characteristics of Watusampu waters after the 2018 tsunami. The results of bathymetry measurements are corrected with tidal data. The results of tide measurements are compared with the predicted results and then analyzed by T-tide to calculate the tidal constituents used in the calculation of the planned water level in Watusampu waters. The bathymetry depth in the Watusampu waters ranges from 66.5 meters. The slope of the coastal waters has increased from north to south. The type of tide in Watusampu waters is mixed tides with a double daily inclination. The dominant tidal constituents are M2 and S2, respectively, with an amplitude of 0.5336 m and 0.4025 m. The tide wave height at the neap tide and spring tide is 0.2622 and 1.8722 m, respectively.","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132742766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-31DOI: 10.22487/25411969.2021.v10.i1.15459
Rika Pratiwi, Nur’eni Nur’eni, I. Setiawan
Life expectancy, LE, is the average estimate of the many years a person takes during life. LE in one region is different from other regions depending on the quality of life that can be achieved by its inhabitants. This research uses the Spatial Autoregressive (SAR) method. SAR model is a linear regression model where the response variable has a spatial correlation. The information of the SAR model due to the dependence of the value of observation in an area with other regions that are interconnected. The results were obtained from the value of the goodness of the model based on the smallest Akaike Information Criterion (AIC) SAR value is 328.24. The influencing factors that life expectancy are mean years of schooling (X_1), poor people (X_2), and labour force participation rate (X_5) which is obtained from the < 0.05 probability value
{"title":"SAR Modelling life expectancy in Sulawesi Island by using spatial autoregressive (SAR)","authors":"Rika Pratiwi, Nur’eni Nur’eni, I. Setiawan","doi":"10.22487/25411969.2021.v10.i1.15459","DOIUrl":"https://doi.org/10.22487/25411969.2021.v10.i1.15459","url":null,"abstract":"Life expectancy, LE, is the average estimate of the many years a person takes during life. LE in one region is different from other regions depending on the quality of life that can be achieved by its inhabitants. This research uses the Spatial Autoregressive (SAR) method. SAR model is a linear regression model where the response variable has a spatial correlation. The information of the SAR model due to the dependence of the value of observation in an area with other regions that are interconnected. The results were obtained from the value of the goodness of the model based on the smallest Akaike Information Criterion (AIC) SAR value is 328.24. The influencing factors that life expectancy are mean years of schooling (X_1), poor people (X_2), and labour force participation rate (X_5) which is obtained from the < 0.05 probability value","PeriodicalId":399499,"journal":{"name":"Natural Science: Journal of Science and Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125073453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：