samsu arif - Academia.edu (original) (raw)
Papers by samsu arif
Research Review Journal of Social Science, Jun 30, 2024
Wahana Peternakan/Wahana peternakan, Mar 1, 2024
This study aimed to ascertain the potential carrying capacity of food and forage crop waste in th... more This study aimed to ascertain the potential carrying capacity of food and forage crop waste in the Pancarijang and Kulo Districts, Sidenreng Rappang Regency, South Sulawesi as a regional mapping for livestock development. The number of ruminant livestock and the harvested area of food and forage crops served as the primary sources of data used in this study. The findings indicated that 21,661,77 tons of dry matter were produced in
In recent years, blockchain technology has received considerable attention from academia, financi... more In recent years, blockchain technology has received considerable attention from academia, financiers, and governments. Blockchain is considered to be a key disruptive technology for the 21 st Century, with a very wide array of application domains that impact all areas of our lives. That such a technology exists just as the world is transitioning towards 6G mobile networks that will offer unprecedented levels of performance but will come an attendant set of ethical and other implications, is highly fortuitous. We offer in this paper a proposal to integrate blockchain technology into the anticipated 6G feature set to address the problem of ensuring and automating Trust to a high degree.
IOP conference series, Aug 12, 2019
The general objective of this study is to project the distribution of settlement land through the... more The general objective of this study is to project the distribution of settlement land through the development and application of spatial dynamics models using dynamic system methods and neural networks, while the specific objectives are: 1) Compiling spatial data on land characteristics and evaluating settlement land in Maros Regency; 2) Multitemporal mapping of settlement and non-residential land in 2010, 2016 and 2017; 3) Compile Causal loop diagrams and model simulations to determine the dynamics of population projections and the size of residential land needs until 2038; 4) Synchronizing land requirements with the allocation of space utilization in Maros Regency Spatial Planning. 5) Design and build a spatial model to predict the development and direction of settlement land using change prediction of Artificial Neural Network (ANN); and map the projected spatial distribution model of residential land every 5 (five) years. This research conducted a recent approach to multitemporal observation and spatial optimization studies by integrating dynamic systems with neural network methods in solving settlement land management problems. The approach with the population growth projection model relates to the spatial dynamics of residential land use using the neural network to facilitate policy makers in decision making for settlement land management. The method used consists of 5 stages: stage I. analysis of land characteristics and land use of multi-temporal settlements, through land surveys, laboratory analysis, and spatial characteristics of land; then the land suitability analysis uses matching method; Phase II: mapping multi-temporal land use in 2010, 2016 and 2017 using analysis and extraction of satellite image information. The image used is Landsat medium resolution satellite imagery; stage III: arranging units and interactions and behaviour between units in a system of population growth dynamics, then making causal loop diagrams and then implementing dynamic software systems to simulate population growth used and residential land needs every five years; stage IV: testing the synchronization of the allocation of space utilization in the Spatial Palnning document of the District with the settlement land resulting from the projection; stage V: build a residential land use projection model which begins with change analysis, transition potential, and change prediction with the neural network method; then the projection result of settlement land needs is mapped every five years interval from 2018-2038 based on the results of the analysis. The implication of the results of the study will provide an overview of the harmony between the pattern of space and the trend of the development direction of the settlement, so that the resulting method can be used as a basis for revising the spatial planning in the future.
Prosiding Seminar Nasional Geomatika, Feb 15, 2019
Salah satu permasalahan yang menyebabkan rendahnya efisiensi penggunaan data citra penginderaan j... more Salah satu permasalahan yang menyebabkan rendahnya efisiensi penggunaan data citra penginderaan jauh ialah penggunaan georeferensi yang beragam baik itu pada data citra maupun data geospasial dan sejenisnya sehingga sering mengakibatkan tumpang tindih interpretasi lahan, ketidakakuratan dan kurang optimal dalam pemanfaatannya. Penggunaan citra resolusi tinggi semakin meningkat dikarenakan dengan tingginya daya guna yang dimiliki untuk perencanaan pembangunan yang berkelanjutan di Indonesia. Penelitian ini dilakukan dengan tujuan untuk umum untuk mendukung Kebijakan Satu Peta (KSP) atau One Map Policy dan menerapkannya dalam program nawacita dari pemerintah Indonesia dengan tujuan khusus menentukan secara manual titik GCP dan menghasilkan data citra Pleiades Morowali yang ter-ortorektifikasi. Data citra mentah Pleiades, data DEM, data titik-titik Ground Control Point (GCP) daerah Morowali kemudian dikumpulkan untuk melakukan proses ortorektifikasi dalam software PCI Geomatica menggunakan metode aproksimasi, dimana didapatkan hasil input data citra yang telah ter-ortorektifikasi dengan nilai RMSer yaitu 0.99 dan akurasi horizontal sebesar 1.97 Meter yang kemudian dibuatkan layout hasil ortorektifikasi citra Pleiades yang telah memenuhi persyaratan sistem georeferensi yang terintegrasi demi mendukung urgensi kebutuhan Indonesia dalam mencapai target kebijakan KSP ini.
International Journal of Environmental Studies
IOP conference series, Dec 1, 2022
Jurnal Ilmiah Membangun Desa dan Pertanian
This study aimed to analyze the characteristics and determinants of rural part-time workers in So... more This study aimed to analyze the characteristics and determinants of rural part-time workers in Southeast Sulawesi Province. This study focuses on the socio-demographic attribute that can influence a person to become a part-time worker. Part-time workers are part of non-full workers, which is considered not a problem. Part-time workers are absorbed in less decent jobs. Young age groups dominate them because they are less experienced in the complexities of job search, less intense in wage negotiations, less financially secure, and more vulnerable to psychological stress. Part-time workers are those who work below standard hours but are not looking for work and are not available for work. This study uses secondary data from the August 2021 National Labor Force Survey (Sakernas). Samples used in this study were 3,540 part-time workers spread throughout Southeast Sulawesi Province. Two thousand eight hundred six part-time workers are in rural areas, and 734 are in urban areas. In this st...
IOP Conference Series: Earth and Environmental Science, 2021
Paddy fields are part of urban green open space which is now rarely found in big cities because i... more Paddy fields are part of urban green open space which is now rarely found in big cities because it has been converted into built-up land. This study aims to study the existence of paddy fields in Makassar City in 2019 and to review their ecological function in CO2 absorption. Spatial analysis using the GIS method was used to map paddy fields that are still productive in 2019 in Makassar City. Analysis of CO2 uptake from the rice cultivation in this urban paddy fields was carried out using allometric equations. Mapping results show that recently, there are 1,473.58 hectares of paddy fields in Makassar City. These paddy fields are spread across seven districts, namely Tamalate, Rappocini, Tallo, Panakukkang, Manggala, Biringkanaya and Tamalanrea. Makassar City must provide a minimum of 5,273 ha of green open space. The existence of this paddy field contributes about 8.38% of the total minimum required green open space (30%) for Makassar City. The paddy fields in Makassar City, planted...
JURNAL GEOCELEBES, 2019
Penelitian bawah permukaan menggunakan metode geolistrik pada daerah perencanaan pelabuhan di Kec... more Penelitian bawah permukaan menggunakan metode geolistrik pada daerah perencanaan pelabuhan di Kecamatan Sanga-sanga Kalimantan Timur. Penelitian ini bertujuan mengetahui jenis dan profil tanah pada lokasi survei dengan cara membuat sebuah model lapisan bawah permukaan bumi dengan parameter arus dan tegangan listrik. Konfigurasi elektrode menggunakan konfigurasi elektrode Wenner-Alfa. Dari hasil dan pembahasan dapat ditarik kesimpulan antara lain; Semua jalur bentangan elektrode mempunyai variasi harga hambatan jenis batuan berkisar antara 5,56 - 7021 ohm m dan variasi harga hambatan jenis pada daerah penelitian mengindikasikan adanya pelapisan dari fresh groundwater, alluvium, clay, dolomite, limestone dan slate. Kata Kunci: daerah bawah pelabuhan; komposisi batuan; variasi haga hambatan jenis batuan.
IOP Conference Series: Earth and Environmental Science, 2019
Deforestation is a permanent change of forest cover area to non-forest cover area. Social factors... more Deforestation is a permanent change of forest cover area to non-forest cover area. Social factors contribute more to the occurrence of deforestation, so this study was directed to examine the social factors that drive deforestation. Research location selected based on the key vulnerability of deforestation profiles. This study only used moderately vulnerability and vulnerability profile. Data analysis in this research using PCA (Principal Component Analysis) Method. The results explained that the Spatial Deforestation Model in South Sulawesi and West Sulawesi have differences based on the vulnerability profile. The dominant deforestation profiles affected were population density, productive age and employment. Population density affects deforestation because the site is always experiencing an increase in population and is not balanced with the extent of its territory, especially on vulnerable profiles. Productive age is very influential and increasing. The employment is also one of ...
Seminar Nasional Geomatika, 2019
Salah satu permasalahan yang menyebabkan rendahnya efisiensi penggunaan data citra penginderaan j... more Salah satu permasalahan yang menyebabkan rendahnya efisiensi penggunaan data citra penginderaan jauh ialah penggunaan georeferensi yang beragam baik itu pada data citra maupun data geospasial dan sejenisnya sehingga sering mengakibatkan tumpang tindih interpretasi lahan, ketidakakuratan dan kurang optimal dalam pemanfaatannya. Penggunaan citra resolusi tinggi semakin meningkat dikarenakan dengan tingginya daya guna yang dimiliki untuk perencanaan pembangunan yang berkelanjutan di Indonesia. Penelitian ini dilakukan dengan tujuan untuk umum untuk mendukung Kebijakan Satu Peta (KSP) atau One Map Policy dan menerapkannya dalam program nawacita dari pemerintah Indonesia dengan tujuan khusus menentukan secara manual titik GCP dan menghasilkan data citra Pleiades Morowali yang ter-ortorektifikasi. Data citra mentah Pleiades, data DEM, data titik-titik Ground Control Point (GCP) daerah Morowali kemudian dikumpulkan untuk melakukan proses ortorektifikasi dalam software PCI Geomatica menggun...
Journal of Environmental Management, 2016
Despite considered a non-consumptive use of the marine environment, diving-related activities can... more Despite considered a non-consumptive use of the marine environment, diving-related activities can cause damages to coral reefs. It is imminent to assess the maximum numbers of divers that can be accommodated by a diving site before it is subject to irreversible deterioration. This study aimed to assess the ecological carrying capacity of a diving site in Mabul Island, Malaysia. Photo-quadrat line transect method was used in the benthic survey. The ecological carrying capacity was assessed based on the relationship between the number of divers and the proportion of diver damaged hard corals in Mabul Island. The results indicated that the proportion of diver damaged hard corals occurred exponentially with increasing use. The ecological carrying capacity of Mabul Island is 15,600-16,800 divers per diving site per year at current levels of diver education and training with a quarterly threshold of 3900-4200 per site. Our calculation shows that management intervention (e.g. limiting diving) is justified at 8-14% of hard coral damage. In addition, the use of coral reef dominated diving sites should be managed according to their sensitivity to diver damage and the depth of the reefs.
Journal of Earth Science & Climatic Change, 2012
A n accurate prediction of the earthquake will minimize the loss of life, severe injuries and dis... more A n accurate prediction of the earthquake will minimize the loss of life, severe injuries and disruption of important services. Generally, before any earthquake, there are foreshocks with hidden signatures of velocity and acceleration which consist of very high frequency spikes super imposed over low frequency waves. It has extremely high instantaneous amplitude variations. Thus, the instantaneous velocity and acceleration become high. The existing low resolution accelerometers and seismometers are unable to register the insight of signatures of these sharp spikes of foreshocks.
Jurnal Geocelebes, Mar 19, 2019
Penelitian bawah permukaan menggunakan metode geolistrik pada daerah perencanaan pelabuhan di Kec... more Penelitian bawah permukaan menggunakan metode geolistrik pada daerah perencanaan pelabuhan di Kecamatan Sanga-sanga Kalimantan Timur. Penelitian ini bertujuan mengetahui jenis dan profil tanah pada lokasi survei dengan cara membuat sebuah model lapisan bawah permukaan bumi dengan parameter arus dan tegangan listrik. Konfigurasi elektrode menggunakan konfigurasi elektrode Wenner-Alfa. Dari hasil dan pembahasan dapat ditarik kesimpulan antara lain; Semua jalur bentangan elektrode mempunyai variasi harga hambatan jenis batuan berkisar antara 5,56-7021 ohm m dan variasi harga hambatan jenis pada daerah penelitian mengindikasikan adanya pelapisan dari fresh groundwater, alluvium, clay, dolomite, limestone dan slate. Kata Kunci: daerah bawah pelabuhan; komposisi batuan; variasi haga hambatan jenis batuan.
Jambura Geoscience Review, 2019
Gorontalo is located at the macro and micro plate boundary, therefore it is located in an active ... more Gorontalo is located at the macro and micro plate boundary, therefore it is located in an active seismotectonic region. This study aims to analyze earthquake damage level in Gorontalo based on seismicity and peak ground acceleration. The data used is obtained from the USGS. Data is made into a database and plotted onto a geological map. Calculation of peak ground acceleration is obtained using the Kawashumi formula. The results of this study indicate that Gorontalo is included in the slight to moderate earthquake damage level because it is dominated by shallow to intermediate earthquake's depth, light to moderate earthquake magnitude, and have a peak ground acceleration 1,462-99,714 gal.
IOP Conference Series: Materials Science and Engineering, 2020
In the construction industry, breakage of sand particles is very common especially at the very ea... more In the construction industry, breakage of sand particles is very common especially at the very early stage of the pile driving work. The breakage of sand particles will result in change of size spectrum and alter its engineering properties. In this research, the effectiveness of bottom ash in improving the engineering properties of crushed sandy soil was studied. The bottom ash of 5%, 10%, 15% and 20% was added into the sand and crushed with 500 and 1000 blows under the Automatic Compactor machine. The engineering properties of different proportion of bottom ash mixture before crushing and after crushing with 500 and 1000 blows were tested. The engineering properties which were measured include the coefficient of uniformity, breakage index, fouling index, permeability and bearing capacity. Results show that adding of bottom ash into the crushable sand improved the load bearing capacity. By adding 20% of bottom ash, the bearing capacity of the crushed sandy soil can be improved by 55...
Research Review Journal of Social Science, Jun 30, 2024
Wahana Peternakan/Wahana peternakan, Mar 1, 2024
This study aimed to ascertain the potential carrying capacity of food and forage crop waste in th... more This study aimed to ascertain the potential carrying capacity of food and forage crop waste in the Pancarijang and Kulo Districts, Sidenreng Rappang Regency, South Sulawesi as a regional mapping for livestock development. The number of ruminant livestock and the harvested area of food and forage crops served as the primary sources of data used in this study. The findings indicated that 21,661,77 tons of dry matter were produced in
In recent years, blockchain technology has received considerable attention from academia, financi... more In recent years, blockchain technology has received considerable attention from academia, financiers, and governments. Blockchain is considered to be a key disruptive technology for the 21 st Century, with a very wide array of application domains that impact all areas of our lives. That such a technology exists just as the world is transitioning towards 6G mobile networks that will offer unprecedented levels of performance but will come an attendant set of ethical and other implications, is highly fortuitous. We offer in this paper a proposal to integrate blockchain technology into the anticipated 6G feature set to address the problem of ensuring and automating Trust to a high degree.
IOP conference series, Aug 12, 2019
The general objective of this study is to project the distribution of settlement land through the... more The general objective of this study is to project the distribution of settlement land through the development and application of spatial dynamics models using dynamic system methods and neural networks, while the specific objectives are: 1) Compiling spatial data on land characteristics and evaluating settlement land in Maros Regency; 2) Multitemporal mapping of settlement and non-residential land in 2010, 2016 and 2017; 3) Compile Causal loop diagrams and model simulations to determine the dynamics of population projections and the size of residential land needs until 2038; 4) Synchronizing land requirements with the allocation of space utilization in Maros Regency Spatial Planning. 5) Design and build a spatial model to predict the development and direction of settlement land using change prediction of Artificial Neural Network (ANN); and map the projected spatial distribution model of residential land every 5 (five) years. This research conducted a recent approach to multitemporal observation and spatial optimization studies by integrating dynamic systems with neural network methods in solving settlement land management problems. The approach with the population growth projection model relates to the spatial dynamics of residential land use using the neural network to facilitate policy makers in decision making for settlement land management. The method used consists of 5 stages: stage I. analysis of land characteristics and land use of multi-temporal settlements, through land surveys, laboratory analysis, and spatial characteristics of land; then the land suitability analysis uses matching method; Phase II: mapping multi-temporal land use in 2010, 2016 and 2017 using analysis and extraction of satellite image information. The image used is Landsat medium resolution satellite imagery; stage III: arranging units and interactions and behaviour between units in a system of population growth dynamics, then making causal loop diagrams and then implementing dynamic software systems to simulate population growth used and residential land needs every five years; stage IV: testing the synchronization of the allocation of space utilization in the Spatial Palnning document of the District with the settlement land resulting from the projection; stage V: build a residential land use projection model which begins with change analysis, transition potential, and change prediction with the neural network method; then the projection result of settlement land needs is mapped every five years interval from 2018-2038 based on the results of the analysis. The implication of the results of the study will provide an overview of the harmony between the pattern of space and the trend of the development direction of the settlement, so that the resulting method can be used as a basis for revising the spatial planning in the future.
Prosiding Seminar Nasional Geomatika, Feb 15, 2019
Salah satu permasalahan yang menyebabkan rendahnya efisiensi penggunaan data citra penginderaan j... more Salah satu permasalahan yang menyebabkan rendahnya efisiensi penggunaan data citra penginderaan jauh ialah penggunaan georeferensi yang beragam baik itu pada data citra maupun data geospasial dan sejenisnya sehingga sering mengakibatkan tumpang tindih interpretasi lahan, ketidakakuratan dan kurang optimal dalam pemanfaatannya. Penggunaan citra resolusi tinggi semakin meningkat dikarenakan dengan tingginya daya guna yang dimiliki untuk perencanaan pembangunan yang berkelanjutan di Indonesia. Penelitian ini dilakukan dengan tujuan untuk umum untuk mendukung Kebijakan Satu Peta (KSP) atau One Map Policy dan menerapkannya dalam program nawacita dari pemerintah Indonesia dengan tujuan khusus menentukan secara manual titik GCP dan menghasilkan data citra Pleiades Morowali yang ter-ortorektifikasi. Data citra mentah Pleiades, data DEM, data titik-titik Ground Control Point (GCP) daerah Morowali kemudian dikumpulkan untuk melakukan proses ortorektifikasi dalam software PCI Geomatica menggunakan metode aproksimasi, dimana didapatkan hasil input data citra yang telah ter-ortorektifikasi dengan nilai RMSer yaitu 0.99 dan akurasi horizontal sebesar 1.97 Meter yang kemudian dibuatkan layout hasil ortorektifikasi citra Pleiades yang telah memenuhi persyaratan sistem georeferensi yang terintegrasi demi mendukung urgensi kebutuhan Indonesia dalam mencapai target kebijakan KSP ini.
International Journal of Environmental Studies
IOP conference series, Dec 1, 2022
Jurnal Ilmiah Membangun Desa dan Pertanian
This study aimed to analyze the characteristics and determinants of rural part-time workers in So... more This study aimed to analyze the characteristics and determinants of rural part-time workers in Southeast Sulawesi Province. This study focuses on the socio-demographic attribute that can influence a person to become a part-time worker. Part-time workers are part of non-full workers, which is considered not a problem. Part-time workers are absorbed in less decent jobs. Young age groups dominate them because they are less experienced in the complexities of job search, less intense in wage negotiations, less financially secure, and more vulnerable to psychological stress. Part-time workers are those who work below standard hours but are not looking for work and are not available for work. This study uses secondary data from the August 2021 National Labor Force Survey (Sakernas). Samples used in this study were 3,540 part-time workers spread throughout Southeast Sulawesi Province. Two thousand eight hundred six part-time workers are in rural areas, and 734 are in urban areas. In this st...
IOP Conference Series: Earth and Environmental Science, 2021
Paddy fields are part of urban green open space which is now rarely found in big cities because i... more Paddy fields are part of urban green open space which is now rarely found in big cities because it has been converted into built-up land. This study aims to study the existence of paddy fields in Makassar City in 2019 and to review their ecological function in CO2 absorption. Spatial analysis using the GIS method was used to map paddy fields that are still productive in 2019 in Makassar City. Analysis of CO2 uptake from the rice cultivation in this urban paddy fields was carried out using allometric equations. Mapping results show that recently, there are 1,473.58 hectares of paddy fields in Makassar City. These paddy fields are spread across seven districts, namely Tamalate, Rappocini, Tallo, Panakukkang, Manggala, Biringkanaya and Tamalanrea. Makassar City must provide a minimum of 5,273 ha of green open space. The existence of this paddy field contributes about 8.38% of the total minimum required green open space (30%) for Makassar City. The paddy fields in Makassar City, planted...
JURNAL GEOCELEBES, 2019
Penelitian bawah permukaan menggunakan metode geolistrik pada daerah perencanaan pelabuhan di Kec... more Penelitian bawah permukaan menggunakan metode geolistrik pada daerah perencanaan pelabuhan di Kecamatan Sanga-sanga Kalimantan Timur. Penelitian ini bertujuan mengetahui jenis dan profil tanah pada lokasi survei dengan cara membuat sebuah model lapisan bawah permukaan bumi dengan parameter arus dan tegangan listrik. Konfigurasi elektrode menggunakan konfigurasi elektrode Wenner-Alfa. Dari hasil dan pembahasan dapat ditarik kesimpulan antara lain; Semua jalur bentangan elektrode mempunyai variasi harga hambatan jenis batuan berkisar antara 5,56 - 7021 ohm m dan variasi harga hambatan jenis pada daerah penelitian mengindikasikan adanya pelapisan dari fresh groundwater, alluvium, clay, dolomite, limestone dan slate. Kata Kunci: daerah bawah pelabuhan; komposisi batuan; variasi haga hambatan jenis batuan.
IOP Conference Series: Earth and Environmental Science, 2019
Deforestation is a permanent change of forest cover area to non-forest cover area. Social factors... more Deforestation is a permanent change of forest cover area to non-forest cover area. Social factors contribute more to the occurrence of deforestation, so this study was directed to examine the social factors that drive deforestation. Research location selected based on the key vulnerability of deforestation profiles. This study only used moderately vulnerability and vulnerability profile. Data analysis in this research using PCA (Principal Component Analysis) Method. The results explained that the Spatial Deforestation Model in South Sulawesi and West Sulawesi have differences based on the vulnerability profile. The dominant deforestation profiles affected were population density, productive age and employment. Population density affects deforestation because the site is always experiencing an increase in population and is not balanced with the extent of its territory, especially on vulnerable profiles. Productive age is very influential and increasing. The employment is also one of ...
Seminar Nasional Geomatika, 2019
Salah satu permasalahan yang menyebabkan rendahnya efisiensi penggunaan data citra penginderaan j... more Salah satu permasalahan yang menyebabkan rendahnya efisiensi penggunaan data citra penginderaan jauh ialah penggunaan georeferensi yang beragam baik itu pada data citra maupun data geospasial dan sejenisnya sehingga sering mengakibatkan tumpang tindih interpretasi lahan, ketidakakuratan dan kurang optimal dalam pemanfaatannya. Penggunaan citra resolusi tinggi semakin meningkat dikarenakan dengan tingginya daya guna yang dimiliki untuk perencanaan pembangunan yang berkelanjutan di Indonesia. Penelitian ini dilakukan dengan tujuan untuk umum untuk mendukung Kebijakan Satu Peta (KSP) atau One Map Policy dan menerapkannya dalam program nawacita dari pemerintah Indonesia dengan tujuan khusus menentukan secara manual titik GCP dan menghasilkan data citra Pleiades Morowali yang ter-ortorektifikasi. Data citra mentah Pleiades, data DEM, data titik-titik Ground Control Point (GCP) daerah Morowali kemudian dikumpulkan untuk melakukan proses ortorektifikasi dalam software PCI Geomatica menggun...
Journal of Environmental Management, 2016
Despite considered a non-consumptive use of the marine environment, diving-related activities can... more Despite considered a non-consumptive use of the marine environment, diving-related activities can cause damages to coral reefs. It is imminent to assess the maximum numbers of divers that can be accommodated by a diving site before it is subject to irreversible deterioration. This study aimed to assess the ecological carrying capacity of a diving site in Mabul Island, Malaysia. Photo-quadrat line transect method was used in the benthic survey. The ecological carrying capacity was assessed based on the relationship between the number of divers and the proportion of diver damaged hard corals in Mabul Island. The results indicated that the proportion of diver damaged hard corals occurred exponentially with increasing use. The ecological carrying capacity of Mabul Island is 15,600-16,800 divers per diving site per year at current levels of diver education and training with a quarterly threshold of 3900-4200 per site. Our calculation shows that management intervention (e.g. limiting diving) is justified at 8-14% of hard coral damage. In addition, the use of coral reef dominated diving sites should be managed according to their sensitivity to diver damage and the depth of the reefs.
Journal of Earth Science & Climatic Change, 2012
A n accurate prediction of the earthquake will minimize the loss of life, severe injuries and dis... more A n accurate prediction of the earthquake will minimize the loss of life, severe injuries and disruption of important services. Generally, before any earthquake, there are foreshocks with hidden signatures of velocity and acceleration which consist of very high frequency spikes super imposed over low frequency waves. It has extremely high instantaneous amplitude variations. Thus, the instantaneous velocity and acceleration become high. The existing low resolution accelerometers and seismometers are unable to register the insight of signatures of these sharp spikes of foreshocks.
Jurnal Geocelebes, Mar 19, 2019
Penelitian bawah permukaan menggunakan metode geolistrik pada daerah perencanaan pelabuhan di Kec... more Penelitian bawah permukaan menggunakan metode geolistrik pada daerah perencanaan pelabuhan di Kecamatan Sanga-sanga Kalimantan Timur. Penelitian ini bertujuan mengetahui jenis dan profil tanah pada lokasi survei dengan cara membuat sebuah model lapisan bawah permukaan bumi dengan parameter arus dan tegangan listrik. Konfigurasi elektrode menggunakan konfigurasi elektrode Wenner-Alfa. Dari hasil dan pembahasan dapat ditarik kesimpulan antara lain; Semua jalur bentangan elektrode mempunyai variasi harga hambatan jenis batuan berkisar antara 5,56-7021 ohm m dan variasi harga hambatan jenis pada daerah penelitian mengindikasikan adanya pelapisan dari fresh groundwater, alluvium, clay, dolomite, limestone dan slate. Kata Kunci: daerah bawah pelabuhan; komposisi batuan; variasi haga hambatan jenis batuan.
Jambura Geoscience Review, 2019
Gorontalo is located at the macro and micro plate boundary, therefore it is located in an active ... more Gorontalo is located at the macro and micro plate boundary, therefore it is located in an active seismotectonic region. This study aims to analyze earthquake damage level in Gorontalo based on seismicity and peak ground acceleration. The data used is obtained from the USGS. Data is made into a database and plotted onto a geological map. Calculation of peak ground acceleration is obtained using the Kawashumi formula. The results of this study indicate that Gorontalo is included in the slight to moderate earthquake damage level because it is dominated by shallow to intermediate earthquake's depth, light to moderate earthquake magnitude, and have a peak ground acceleration 1,462-99,714 gal.
IOP Conference Series: Materials Science and Engineering, 2020
In the construction industry, breakage of sand particles is very common especially at the very ea... more In the construction industry, breakage of sand particles is very common especially at the very early stage of the pile driving work. The breakage of sand particles will result in change of size spectrum and alter its engineering properties. In this research, the effectiveness of bottom ash in improving the engineering properties of crushed sandy soil was studied. The bottom ash of 5%, 10%, 15% and 20% was added into the sand and crushed with 500 and 1000 blows under the Automatic Compactor machine. The engineering properties of different proportion of bottom ash mixture before crushing and after crushing with 500 and 1000 blows were tested. The engineering properties which were measured include the coefficient of uniformity, breakage index, fouling index, permeability and bearing capacity. Results show that adding of bottom ash into the crushable sand improved the load bearing capacity. By adding 20% of bottom ash, the bearing capacity of the crushed sandy soil can be improved by 55...