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Spatial distribution of startup (Gojek and Grab) users in Palembang city, Indonesia
No full textThe emergence of startups in Indonesia contributes to increasing the number of those working as startup users. Startup users define those who make use of startup services and enterprises to perform their business. This research was designed to explain the spatial distribution of startup (Gojek and Grab) users in Palembang City, Indonesia. It employed spatial analysis with inverse distance weighting and kernel density. The results indicated that startup (Gojek and Grab) users who established their business before 2020 were in densely-populated parts of the city. However, based on the interpolation of their business locations, they were variably distributed in lowly to densely-populated areas whose economic activities were dominated by trade and services. Furthermore, the nearest neighbor analysis revealed that startup (Gojek and Grab) users were close to permanent markets (including semi-permanent ones, supermarkets, restaurants, and grocery shops) and had better access to online transportation and communication with good cell phone receptions. © 2022, The Author(s), under exclusive licence to Springer Nature B.V
Geographical Names Study of Nagari, a Local Customary-Based Community Unit in Agam Regency, Indonesia
No full textNagari names in Agam Regency are lacking historical record despite being a fundamental spatial information. Preliminary research has revealed inconsistencies in nagari name records, even in official government documents. This paper conducts an analysis of nagari names within Agam Regency, West Sumatra Province, Indonesia. Geographical names depict both the natural landscape and human activities, including their interaction with the environment 1, and Agam Regency spans from sea level to 2891 meters, featuring diverse landscapes, while the formation of nagari is deeply rooted in local customary law. This raises a question: what are nagari names in Agam Regency, and what do they signify?. Therefore, the objectives are: 1) establishing a digital nagari name database for Agam Regency, and 2) analysing geographical names based on linguistic and historical meanings. Primary methods used are interviews and literature studies. Approximately 52.44% of names are related to man-made features, human activities, and interactions, while others derive from natural features or a combination of both. Nagari names were found to be clustered around Bukittinggi and Lubuk Basung, historically significant regions. This study contributes to the preservation of nagari names in Agam Regency, and the digital database holds potential for further spatial analyses. © 2023 EDP Sciences. All rights reserved
Development of official statistics models for analysis of population sectoral data in Indragiri Hilir Regency
No full textIndragiri Hilir Regency is one of the regencies located in Riau Province which has a population of 658,025 thousand in 2022. The population consists of several groups ranging from children, adolescents, adults and the elderly. Indragiri Hilir Regency has three regional public hospitals, namely the Puri Husada Tembilahan Hospital, the Tenku Sulung Pulau Kijang Hospital, and the Raja Musa Sungai Guntung Hospital. Each hospital has official statistics consisting of sectoral data according to the data owned by the hospital. This study aims to show and analyze the existing official statistics and create an official statistics model for analysis of population sectoral data in health analysis. The method used is explanatory method and descriptive statistical analysis method and descriptive statistical analysis. The results of this study show that every regional public hospital in Indragiri Hilir Regency has official statistics which consist of sectoral data owned by the agency, the official statistics model is the answer to become a reference in carrying out sectoral data analysis for policy making in the field of analysis health. © 2023 EDP Sciences. All rights reserved
Temporal Monitoring of Surface Runoff Using Remote Sensing in Pabelan Watershed, Central Java
No full textIn general, current spatial planning tends to focus on the need for land and its economic value. The land has a limited capacity while the need for land continues to increase. Numerous watersheds in Indonesia are enduring the impact of land changes due to exploitative land use. Changes in watershed conditions as a result of uncontrolled land expansion without regard to environmental aspects often lead to undesirable conditions, in addition the lack of consideration of environmental aspects can lead to various disasters. So that there is a need for spatial planning so that the fulfillment of land and space needs still pays attention to environmental aspects. This study aims to map the spatial distribution of surface runoff using remote sensing data in the Pabelan watershed and to describe the relationship between land cover changes and surface runoff in the watershed. Remote sensing is used to determine changes in land cover and surface runoff in this watershed. Analysis of land cover changes and mapping of the surface runoff area was carried out to describe the relationship between land cover changes and surface runoff. The method used in the surface runoff mapping was made using the Cook. The results of this study are in the form of land cover maps of the Pabelan watershed in different years, visualization maps of surface runoff, and the relationship between land cover changes and surface runoff. The results show that surface runoff in 2020 is still dominated by the same runoff class as the runoff class in 2009 and 2015, which is dominated by the normal class but has a different area. The normal class in 2020 has an area of 69,92 km2. In 2020, the normal class has the widest area compared to previous years. The low runoff class also has the most extensive area this year. In 2009 the low runoff class had an area of 0,27 km2, in 2015 it was 0,48 km2 while in 2020 it was 1,49 km2. The high runoff class in 2020 is the lowest compared to the previous year. In 2009 this high-class area was 46,12 km2, in 2015 it was 43,42 km2 and in 2020 it was only 40,46 km2. The extreme runoff class has the widest area this year. In 2009 the extreme runoff class was 0,23 km2, in 2015 it decreased to 0,17 km2, and in 2020 it was 0,36 km2. In this study, it can be concluded that land cover change is not a major factor in the formation of surface runoff. There is another factor, which can affect the surface runoff. © 2023 American Institute of Physics Inc.. All rights reserved
Analisis Reaktivitas Batang Kendali dan Distribusi Fluks Neutron pada Hydride Microreactor
No full textNuklir merupakan salah satu sumber energi yang dapat digunakan untuk mengurangi emiNuklir merupakan salah satu sumber energi yang dapat digunakan untuk mengurangi emisi karbon. Pengembangan Reaktor nuklir mengarah pada desain yang lebih kecil, lebih aman, dan lebih ekonomis seperti Small Modular Reactor dan Microreactors. Penelitian ini akan melakukan analisis terhadap beberapa parameter keselamatan utama dari desain hydride microreactor sesuai dengan standar International Atomic Energy Agency (IAEA). Parameter tersebut yaitu shutdown margin, PPF (power peaking factor), dan reaktivitas batang kendali. Reaktor dimodelkan dalam kode simulasi openMC. Dilakukan simulasi dengan memvariasikan posisi kelompok batang kendali untuk memperoleh nilai reaktivitas batang kendali. Data reaktivitas batang kendali digunakan untuk memperoleh nilai reaktivitas lebih, shutdown margin, dan kurva reaktivitas integral dan diferensial dari batang kendali. Dalam simulasi dilakukan pula perhitungan tally terhadap fluks neutron dan heating untuk memperoleh distribusi fluks dan nilai PPF. Perhitungan tally dilakukan dengan metode FET (functional expansion tally).
Pada keadaan BOL (beginning of life), reaktor memiliki reaktivitas lebih sebesar 10,97 %Δk/k, yang berkurang menjadi 0,50 %Δk/k setelah penambahan Gd, PPF radial sebesar 1,6541, PPF aksial sebesar 1,2549, dan Shutdown Margin sebesar -6,61 %Δk/k. Nilai total reaktivitas integral dari BK1 sebesar -6,11 Δk/k, dari BK2 sebesar -7,12 %Δk/k, dan dari Kompensator sebesar -1,00 Δk/k. Reaktor beroperasi pada spektrum termal dengan puncak fluks berada di titik tengah volume aktifsi karbon. Pengembangan Reaktor nuklir mengarah pada desain yang lebih kecil, lebih aman, dan lebih ekonomis seperti Small Modular Reactor dan Microreactors. Penelitian ini akan melakukan analisis terhadap beberapa parameter keselamatan utama dari desain hydride microreactor sesuai dengan standar International Atomic Energy Agency (IAEA). Parameter tersebut yaitu shutdown margin, PPF (power peaking factor), dan reaktivitas batang kendali. Reaktor dimodelkan dalam kode simulasi openMC. Dilakukan simulasi dengan memvariasikan posisi kelompok batang kendali untuk memperoleh nilai reaktivitas batang kendali. Data reaktivitas batang kendali digunakan untuk memperoleh nilai reaktivitas lebih, shutdown margin, dan kurva reaktivitas integral dan diferensial dari batang kendali. Dalam simulasi dilakukan pula perhitungan tally terhadap fluks neutron dan heating untuk memperoleh distribusi fluks dan nilai PPF. Perhitungan tally dilakukan dengan metode FET (functional expansion tally).
Pada keadaan BOL (beginning of life), reaktor memiliki reaktivitas lebih sebesar 10,97 %Δk/k, yang berkurang menjadi 0,50 %Δk/k setelah penambahan Gd, PPF radial sebesar 1,6541, PPF aksial sebesar 1,2549, dan Shutdown Margin sebesar -6,61 %Δk/k. Nilai total reaktivitas integral dari BK1 sebesar -6,11 Δk/k, dari BK2 sebesar -7,12 %Δk/k, dan dari Kompensator sebesar -1,00 Δk/k. Reaktor beroperasi pada spektrum termal dengan puncak fluks berada di titik tengah volume akti
Pemodelan Respon Detektor NaI(Tl) Menggunakan MCNP untuk Identifikasi Dimensi dan Posisi Sumber Radiasi
No full textThe use intensity of radioactive sources within the Department of Nuclear Engineering and Engineering Physics for learning and research purposes is very high. Oak Ridge's 2016 chip source cesium-137, cobalt-60, and stronsium-90 are one of the most frequently used sources. This study aims to determine the dimensions and position of the source's active material.
Empirical data as a comparison was carried out using 2 IDENTIFINDER R-400 ULK-NG detectors simultaneously. Measurements were made at 3 distances, namely 1 cm, 3 cm, and 5 cm. The measurement times are 1 minute, 3 minutes, and
5 minutes, respectively. For each of these distances, angle changes are made at intervals of 22.5⁰. The spectrum of the simulation results with the MCNP is compared with the spectrum of the results of direct measurements. Parameters
observed were peak count, peak energy, and FWHM (Full Widht at Half Maximum)
From the MCNP modeling for detector IdentiFINDER R-400 id2-ULK-NG,
the thickness of cesium-137 produced by Oak Ridge National Laboratory in 2016
is 0.3 cm and the radius is 0.5 cm. The position of source obtained is 0.01 from both window and passive side with a position of 0 for the y axis. The GEB (Gaussian Energy Broadening) parameter is −0.018; 0.1245; and −0.1815. The mean relative error rate of the peak counting rate from the MCNP modeling against the empirical measurements obtained is 7.4%
Studi Kontribusi NORM dan TENORM pada Tanah terhadap Aras Radioaktivitas Lingkungan di Surabaya Barat
No full textRadiation exposure received by humans can come from NORM contained in soil and rocks, the amount of which depends on the geological conditions of each area. Metal smelting and limestone mining activities also concentrate NORM and allow for an increase in environmental radioactivity that can be harmful to humans. In this study, an analysis of environmental radioactivity was carried out in West Surabaya. A total of 12 soil samples were taken. The samples were prepared by cleaning, drying, grinding, sifting and isolating for 20 days. Samples were analyzed by gamma spectrometry method to determine the radioactivity concentration of natural radionuclides. Surfer software version 13.0 was used to map the distribution of radionuclide radioactivity concentrations. The results of the study found several types of natural radionuclides, including: 40K, 232Th with decays namely 228Ac, 212Pb, 208Tl and 226Ra with decays namely 214Pb and 214Bi. 40K radionuclide has a concentration range of 47.156 ± 4.227 Bq/kg to 350.807 ± 62.493 Bq/kg. At 232Th has a concentration with a value range of 18.856 ± 2.546 Bq/kg to 50.197 ± 14.412 Bq/kg. Radionuclide 226Ra has a concentration of 17.784 ± 2.498 Bq/kg to 57.425 ± 9.537 Bq/kg. This value is still below the environmental radioactivity standard set by BAPETEN, namely 3000 Bq/kg for 40K and 300 Bq/kg for 232Th and 226Ra. The distribution of radionuclides at high concentrations of 40K is more likely to be on the southwest and north, 232Th is more likely to be from west to north, and 226Ra is more likely to be from east to northwest. Based on the radiological parameters obtained, for Raeq, Hex, Hin, D, Deff, and ELCR respectively the mean values were 100.519 Bq/kg, 0.271, 0.366, 46.106 nGy/hour, 56.544 µSv/year, and 2.18 × 10−4. The values obtained are below the safe limits set by UNSCEAR so that West Surabaya is safe from radiological hazards
The Dynamic of Labors Absorption During the Covid-19 Pandemic in Bangka Belitung Islands
No full textBangka Belitung is a natural resources-rich province in Indonesia, especially tin metal. The covid-19 pandemic has had a huge impact on labor and economic conditions in Bangka Belitung. The method used in this study is using secondary data from the Central Bureau of Statistics Bangka Belitung. Analysis of trends and characteristics of labor absorption is done by analyzing several indicators such as the characteristics of the employment sector, the attribute of employment status, the characteristics of the types of employment, and the elasticity of the employment field. The results of data acquisition are then analyzed using descriptive quantitative data analysis. The study shows a shift in the dominance of workers from the primary to the tertiary sector. The dynamic of labor absorption in Bangka Belitung Island is mainly affected by covid-19 and technology. The agricultural sector is the dominant type of work and has the highest increase in labor absorption in 2020 at 2,98. A significant decrease was 3,58 in the mining sector as a major sector in Bangka Belitung. Labor productivity shows a fluctuating trend in each sector. Employment decreased during the pandemic followed by the substitution of jobs that focus on the formal sector for the informal sector. © 2023 EDP Sciences. All rights reserved
Analysis of Carrying Capacity of Crop Agricultural Land in Banten Province
No full textOne of the problems with the need for land is the decreasing amount of agricultural land in Banten Province in 2020 which also affects the inability to meet the food needs of the population independently. This study aims to determine the level of carrying capacity of paddy agricultural land in meeting the food needs of the people in Banten Province. Spatially, this research covers 4 regencies and 4 cities in Banten Province, namely Pandeglang Regency, Lebak Regency, Tangerang Regency, Serang Regency, Tangerang City, Cilegon City, Serang City, and South Tangerang City. The data used is secondary data taken from the Central Statistics Agency and the Agriculture Office of Banten Province. The calculation of Carrying Capacity of Agricultural Land in this study used a combination of theories from Odum, Christeller, Ebenezer Howard, and Isard. The variables used in the calculation included the harvested land area (Ha), population size, average rice production per hectare (Kg/Ha), and the Minimum Physical Requirement with a predetermined value of 265. Data processing was carried out using Microsoft Office Excel and map making was carried out using ArcGIS software. The results showed that There are 2 districts with class II and there are 6 regencies/cities classified into the carrying capacity of class III. © 2023 EDP Sciences. All rights reserved
From nature to the laboratory, an effort to raise disaster awareness
No full textAceh is one of the provinces in Indonesia with a high risk of disaster. The threat of disasters in the form of forest and land fires, tornadoes, floods, flash floods, ROB floods, landslides, extremes and abrasions often occur in Aceh, namely 365 disaster events from January to June in 2021. Based on the calculation of the disaster ratio index it is known that in 2020 Aceh obtained a value of 153.58 which belongs to the high class. Almost all areas of Aceh have a red color that indicates that the value of the disaster ratio index in Aceh is more than 144. The above conditions require the people of Aceh to be able to have awareness of the disaster that will befall him and his family. Therefore, there needs to be efforts to increase awareness of disasters in the community, one of which is through education. Aceh which has a form of local wisdom about the disaster can increase public disaster awareness if it can be understood or studied by the community. Therefore, local wisdom derived from nature needs to be legalized or made management in the form of natural laboratories. This is so that learners, the general public or academics can learn and adapt the local wisdom to their living environment or can convey toothers. Thus, it is expected that public disaster awareness will increase. This is in accordance with the results of Crismono's research where natural learning and integration of local knowledge can increase the development of community capacity in disaster management as well as Wulansari which found results where research from the use of natural laboratories can increase the biological learning outcomes of learners by 80 © 2023 Author(s)