bluuebunny/crossref_metadata_2025 huggingface dataset:
Characterization of Sansevieria Fiber with NaOH Alkalization to Increase Tensile Strength
Authors: Widodo Edi , Mulyadi  , Tjahjanti Prantasi Harmi
Published: November 2022

Sanseviera fiber has physical and chemical characteristics that support it to be used as a biocomposite booster. The fiber length dimension obtained from decortivation can be maintained well even with a simple and inexpensive method. The tensile strength can be maintained well in the 10% NaOH alkaline treatment which is 1,35 N. The lignin and hemicellulose content can be lost effectively, thereby increasing the compatibility of adhesion with the resin. The alkali treatment was carried out at room temperature of 260 C, soaked for 4 hours, then rinsed to remove dust and other impurities. Alkalization serves to remove the lignin content in the fiber. The results of the FTIR test showed that the remaining lignin still persisted in the fiber at an absorption range of 1600 cm-1 with an aromatic group C=C which was shown from the FTIR peak graph. These results support the exploration of sansevieria fiber as a biocomposite booster.
Design and Construction of Thermoelectric Generator with Comparison of Sun and Water Heat Temperatures
Authors: Zainuri Ahmad Agung , Akbar Ali
Published: November 2022

In today's technological developments, many alternative and new renewable energies have been launched to reduce the impact of global warming. However, the availability of new renewable energy sources in Indonesia is still not fully utilized. As an alternative to deal with these problems, thermoelectric is one of the solutions in overcoming energy problems that are always increasing from year to year along with technological advances. On the other hand, one of the alternative energy sources that can be utilized is solar energy. The use of this energy can be done by utilizing the heat temperature. By using a thermoelectric generator, the results of the heat obtained from solar energy are converted into electricity. This is included in order to obtain a renewable and environmentally friendly energy source. With the existence of one of these problems, it encourages the researcher's plan to make a "DESIGN AND CONSTRUCTION OF THERMOELECTRIC GENERATOR WITH COMPARISON OF SUN AND WATER HEAT TEMPERATURES" which will be carried out regarding the efficiency of thermoelectric generator design that utilizes simple materials in order to convert heat energy into electricity. The sun's rays are focused on the heat receiver in the design so that the difference between hot and cold temperatures is obtained which will be converted into electrical energy by the Setback effect method. In this study, 10 types of thermoelectric generator TEC 12705 were used. The test was carried out in two stages, namely in the first stage. TEG circuits are connected in series, in the second stage the TEG circuits are connected in parallel. for the heat conductor material using zinc aims to obtain an efficient heat temperature and is delivered to the hot side of the TEG. After the analysis, the average result of 10 TEC rotation in a series circuit is the total voltage of 33.27 V which is divided by 9 times, the test results in 3.69 V, while in a parallel circuit the total voltage is 1.7 V and then divided by 9 times the test results are obtained. 0.19 V. From the analysis of the average output voltage of the series and parallel circuits it can be concluded that the series circuit has a larger output, in accordance with Kirchhoff's II law theory where the sum of the voltages in a closed path is equal to zero, or the sum of the voltages on each its constituent components that make up a closed path will be equal to zero.
Analysis of Landslide Prone Areas as the Basis for Landslide Disaster Mitigation in Bungbulang District of Garut Regency
Authors: Susetyaningsih Adi , Nurhakim Aris Ihsan
Published: November 2022

Landslides are natural disasters that often result in property losses, fatalities and damage to public facilities. This research aims to map landslide-prone locations and determine mitigation strategies that are appropriate to the conditions of the region at the research site. The parameters used to determine landslide prone areas refer to the standards that have been set by Puslitanak Bogor, namely, rainfall, slope slopes, land use, geological structures, and soil types. Overlay, scoring, weighting, and classification methods are carried out on all five parameters by utilizing software based on Geographic Information Systems (GIS). Landslide distribution point with a very high category of land movement is found in all villages in Bungbulang District with an overall area of ±218 ha but there are five villages that have a very large threat of loss to the economy and even fatalities including Bojong Village, Mekarbakti Village, Cihikeu Village, Mekarjaya Village and Wangun Jaya Village. Based on the map of the spread of landslide potential that has been made, a structural mitigation strategy is needed in the form of building a ground retaining wall (TPT) in Bojong Village which is at the coordinate point utm X 789824,828282 Y 9175193,14279, Mekarbakti Village with coordinate point UTM X 788411.150969 Y 9178084,18717, Mekarjaya Village with coordinate point UTM X 784761.725735 Y 9175112.74001, relocation of residents' settlements in Wangun jaya Village with utm X coordinate point X 781667.425142 Y 9177593.35493, and the transfer of land functions in Cihikeu Village with coordinate point UTM X 786159.83242 Y 9177593.35493, as well as by improving maintenance of existing infrastructure infrastructure. Education to the community is also very necessary in maintaining and improving the carrying capacity of the environment, so as to create a resilient and ready society for disaster threats.
Effect of Sand Grain on Adsorption of Xanthan Gum and Polyacrylamide
Authors: Kurniadi Hardi Maifra , Fathaddin Muhammad Taufiq , Riswati Shabrina Sri
Published: November 2022

Polymer flooding is an Enhanced oil recovery (EOR) method using chemicals, such as xanthan gum and polyacrylamide which are widely used in the field. Polymer flooding can improve the mobility of the injection fluid, but in the reservoir the polymer has an interaction with sand known as adsorption which causes some of the polymer to be bound to the surface of the pore of sand, so that it has an impact on the ineffectiveness of the injection. The purpose of this study want to determine and compare the effect of sand grain on the adsorption of xanthan gum and polyacrylamide polymer solutions. Based on the experiment results, it was found that the increase in adsorption was proportional to the increase in polymer concentration. From two polymers used, xanthan gum showed lower adsorption than polyacrylamide. Based on the sand grain, the adsorption that occurs is greater in the grain size for large sand compare small.
Carbonate Reservoir Characterization Based on Rock Type Analysis in Minahaki Formation and Tomori Formation, "HK" Field, Banggai Basin
Authors: Khairi Hilmy , Burhannudinnur Muhammad , Herdiansyah Firman
Published: November 2022

The research area is located in the Banggai Basin, Central Sulawesi, which part of the Eastern Arm of Sulawesi Island that originated from the collision between Banggai - Sula Microcontinent and West Arm Volcanic Arc from Sulawesi Island. This research has reservoir target in Minahaki Formation and Tomori Formation those are carbonate rocks. The problem limitation of this research is to characterize carbonate reservoir based on the distribution of rock types. The intention of this research is to analyze carbonate reservoirs with petrophysical properties and analyze reservoir characterization based on rock type distribution, while the purpose is determine the petrophysical property values of the Minahaki Formation and Tomori Formation, then determine the distribution of rock types for characterizing the reservoir rocks. The research methods begin with literature study, data collection, and data analysis. The results of the petrophysical analysis and pay zone in Minahaki Formation obtained an average: net pay thickness is 359.5 feet – 398.5 feet, vshale 23.55% - 34.48%, PHIT 13.33% - 22.84%, PHIE 9.9% - 16.89%, Sw 61.23% - 76.95%, and permeability 610.5 mD – 1360.1 mD. Meanwhile, Tomori Formation obtained an average: net pay thickness is 52.5 feet – 679 feet, vshale 16.53% - 34.7%, PHIT 3.5% - 7.87%, PHIE 2.77% - 6.09%, Sw 26.01% - 42.97%, and permeability 39 mD – 161.9 mD. There are six rock type distribution in the research area those are rock type 1 is ≤ 0.245 micrometers, rock type 2 is 0.314 – 0.48 micrometers, rock type 3 is 0.5 – 0.965 micrometers, rock type 4 is 1.04 – 2.35 micrometers, rock type 5 is 2.36 – 15.08 micrometers, and rock type 6 is 19.66 – 78.82 micrometers.
Adsorption of Activated Carbon from Coal on Coal Briquette Combustion Flue Gas
Authors: Suliestyah  , Permata Sari Indah
Published: November 2022

Coal briquette is expected to be able to become low-cost alternative energy source. However, coal briquette combustion produces gas emission such as SO2, NOx, CO, and CO2 that cause air pollution. The objective of this research is to minimize flue gas emission by using activated carbon made from low level coal such as lignite, obtained from South Sumatera. Activated carbon formation is conducted by using chemical activation method, with ZnCl2 composition variations of 25%, 30%, 35%, 40%, and 45% and coal grain size of 40 mesh, 60 mesh, 80 mesh, and 100 mesh. Carbonization process was conducted at 500°C for 2 hours. Carbonization was conducted by using an air tight steel box infused by nitrogen along the process. The result of this research shows that the composition of ZnCl2 40% and coal 60% with 80 mesh of coal grain size, is the optimum condition to produce activated carbon with highest iodine value of 1323 mg/g. in the application of coal briquette flue gas adsorption experiment, the activated carbon is highly effective in absorbing NO2 with adsorption volume of 87.6 - 90.8%. SO2, CO2, and poly aromatic hydrocarbon (PAH) gas adsorption levels are varied from 27% to 47.8%, but not really effective in absorbing CO gas with adsorption capacity of 11.5%. The activated carbon utilized in this research has the potential to be developed as effective adsorbent for coal combustion exhaust gas emission.
Fuel and Boiling Point Analysis in Mixing Between Ethanol with Bio-Diesel and Diesel Fuel
Authors: Setiawan Budi , Bhikuning Annisa
Published: November 2022

Global warming can be caused by pollution in the environment. Pollution comes from combustion from fossil fuels. Therefore, it is important to study some renewable energies for alternative fuels other than fossil fuels. Blending between ethanol to biodiesel and diesel fuel is one practical solution that can be applied. This research was conducted by making a sample of the fuel to be tested with a mixture of ethanol - biodiesel formula (10%, 25% and 35%) and for a mixture of ethanol - diesel fuel (10%, 25% and 35%). The fuel properties were tested such as viscosity, density, boiling fuel, and cetane index. The results show that the addition of ethanol to biodiesel and diesel fuel can produce better fuel properties.
Granitic Basement Fracture Analogue by Using Integrated Digital Outcrop Model and Fieldwork, at Muaro Silokek, West Sumatra
Authors: Koesmawardani W T , Rudyawan A , Sapiie B
Published: November 2022

The study aims to determine fracture characteristics such as orientation, fracture attributes, fracture density distribution, and mineral composition of quartz and feldspar. The study used photogrammetry data to know the distribution and geometry of macro-scale fracture, linear scanline and windows scan data to understand the characteristics of mesoscale fracture attribute, and thin section rocks data from oriented samples to determine petrographic analysis and micro-scale fracture. After analyzing each of these data, analog basement fractured reservoir modeling could be built from integrating the data and modeling parameters based on available fieldwork data. The fault in the research area is represented as a Riedel shear with the orientation direction of NNW-SSE, NE-SW, and ENE-WSW. The fracture density is influenced by its position on the fault and increases in the fault damage zone. The granite type in the study area was divided into three types, namely alkali feldspar granite, syeno granite, and monzogranite. Each granite type has a different response to fractures and shows that the fracture density will increase with the greater quartz and k-feldspar in the fault damage zone. Fracture permeability values are strongly influenced by the geometry of fracture position, fracture aperture, and fracture length. This study produced a new perspective for fractured basement reservoirs, especially for granitic rocks, generally the primary target for basement fracture reservoirs along Sumatra.
Middle Phase Behavior of SLS Surfactant Bagasse at Intermediate Crude Oil
Authors: Aditya Renato , Riswati SS , Sumirat Iwan , Bharoto
Published: November 2022

The middle phase emulsion is the most important parameter in the compatibility test that determines the success of the surfactant in the Enhanced Oil Recovery (EOR) process. The purpose of this research was to observe the mid-phase emulsion formed on the use of Sodium Lignosulfonate (SLS) surfactant at various concentrations. One of the compatibility tests that will be used is the phase behavior test. Phase Behavior is carried out to determine whether SLS surfactant forms a middle phase emulsion when used in a crude oil. The method used in the phase behavior test is 2 mL of surfactant solution with a certain concentration mixed with 2 mL of crude oil which is inserted into a scaled test tube. Then the surfactant and crude oil solution in the test tube was shaken slowly. During the test, the test tube was placed in an oven at a temperature of 60° C for 21 days. The first observations were made during the first shaking process, then observed at 30 minutes, 60 minutes, 2 hours, 1 day, 2 days, 7 days, 14 days and 21 days. The formation water salinity were used at 40,000 ppm, 60,000 ppm and 80,000 ppm. From the results of this phase behavior test, the best mid-phase emulsion was formed at a surfactant concentration of 2.5% at 40,000 ppm of formation water salinity with an emulsion value of 11.3%. While the 60,000 ppm and 80,000 ppm formation water salinity formed the upper phase emulsion. From this research, it can be concluded that the formation of the middle phase emulsion of SLS surfactant bagasse in the intermediate crude oil was influenced by the salt content of the formation water used.
Analysis of The Efficiency of Value Chain on Livestock (Case Study: Chicken Meat)
Authors: Wahyuni Hana Catur , Indriastuti Ika Ratna , Azzahra Rima
Published: November 2022

In health, livestock products are a source of animal protein which is important for human health. However, in its development, there is a problem of inefficiency in the value chain of livestock products. This study used a case study on the chicken meat value chain. The research objective was to identify the value chain flow of chicken meat, identify the types of inefficient activities, and measure the level of inefficiency of each of these activities. The research method used is Failure Mode Effect Analysis (FMEA). The research was conducted in two stages. The first stage is carried out through observation to identify value chain flows and types of inefficient activities. The second stage is used to conduct an assessment so that the results of the inefficiency level are obtained. The results showed that there were several actors in the chicken meat value chain, including breeders, chicken distributors, chicken slaughter companies, chicken meat distributors, and chicken meat retailers. Overall, there are 25 inefficient activities in the chicken meat value chain. Activities with a high level of inefficiency occur in the process of slaughtering chickens. Therefore, the process of slaughtering chickens needs to be a priority for improvement in the future
Analysis of eco-label certification implementation on eco-friendly products in Indonesia
Authors: Isharyadi F , Ayuningtyas U , Kiemas R A , Aditiyawan  , Ulfah F , Purnamasari B D , Pratiwi A I
Published: November 2022

The significant increase of population, especially in Indonesia, has an impact on consumption per capita. This phenomenon causes a domino effect on the environment quality. Concern and awareness of consumers towards the environment is important, one alternative that can be done to protect the environment is to use environmentally friendly (eco-friendly) product. Eco-friendly products are currently marked with an eco-label affixed to a product, which indicates that a product is produced with due regard to the principles of environmental sustainability. This study aimed to identify and analysed implementation of eco-label certification on eco-friendly products in Indonesia. This research is based on a literature study of the current implementation of eco-label certification on eco-friendly products. Furthermore, the results showed that various types of eco-label certification have been developed for eco-friendly products in Indonesia. The implementation of eco-label certification has been carried out on several products; generally eco-label certification uses the 14000 series standard as a reference in conducting certification. Eco-label certification is expected to support the goals of the Government of Indonesia in sustainable development. In addition, the trend of demand for eco-friendly products by global consumers will certainly provide competitiveness for Indonesian products while still paying attention to environmental sustainability.
Environmental management efforts due to landslides in Lunyuk Rea Sumbawa
Authors: Utama P B , Komarudin N A , Jayatri A U
Published: November 2022

Indonesia is located in the movement of tectonic plates that collide with each other, namely the Eurasian plate, the Pacific plate, and the India-Australia plate, causing many changes in geological configurations that can cause disasters. Landslide disaster often occur in Lunyuk Rea Village which causes a decrease in environmental quality. This study aims to determine how the environmental management efforts due to landslides for environmental preservation. This study uses a survey method with a quantitative analysis approach based on topographic conditions in the field, spatial identification using remote sensing imagery, and digital elevation models as well as qualitative analysis by dividing land use classification, rock types, soil types, rainfall intensity. The results of the analysis of the level of environmental damage in Lunyuk Rea Village are included in the moderately damaged and heavily damaged categories. The environmental management strategy in Lunyuk Rea Village is to apply vegetative, mechanical, chemical, and normative methods.
Identification of leading sectors for sustainable regional development: A case study of D.I Yogyakarta region
Authors: Sugarmansyah U , Setiastuti N , Soewargono B D , Nugroho B H , Apriyanto H
Published: November 2022

It might be rare enough in Indonesia to use an extended input output model in analysing regional economy and environment which are integrated in a single analytical method. The aim of the study is to identify the region’s leading sectors considering economic and environmental aspects, in particular carbon emissions, in an integrated manner. The method of analysis used is an extended input-output model. The main source of data used is the I-O Table and the report book of Greenhouse Gas Inventory of D.I Yogyakarta. The results of the analysis show that the leading sectors are selected namely the manufacturing industry; procurement of electricity and gas; transportation and warehousing; provision of accommodation and food products and beverages; and information and communication. The simulation results show that with the increase in the final demand of 17 economic sectors of D.I Yogyakarta by 25% in the next five years, the 5 leading sectors will contribute to the Gross Regional Domestic Product of D.I Yogyakarta of around IDR 14.93 trillion, but they will also produce the total of CO2e emissions of around 1,267.9 GgCO2e. The local government needs to develop these five leading sectors and also mitigate carbon emissions.
Correlation and projection analysis between total population and total electrical energy consumption in Province of Bangka Belitung Island
Authors: Sulistiana I , Dalimunthe D Y , Saputra D , Aldila H , Pririzki S J , Maryam I
Published: November 2022

This study aims to analyze the projected total population and its correlation to the level of electricity consumption in the Province of Bangka Belitung Islands. The correlation of total population to the level of electrical energy consumption and its projections are very important as basic information in designing sustainable regional development, especially in the energy and economic sectors. The time series data used in this study starts from 2007 and ends in 2021 with a projected value starting from 2022 to 2030. The projection method used is the exponential smoothing method with the results of model fitting that the Holt’s Exponential Smoothing model is the best model with the smallest Root Mean Square Error (RMSE), R Squared and Mean Absolute Percentage Error (MAPE) values among other models, namely 15381,641 for the RMSE value, 0.979 for R Squared value and 0.936 for the MAPE value. The projection results obtained that the Total Population and Total Electrical Energy Consumption variables in the Province of Bangka Belitung Islands have a significant increase namely 0.20% for total percentage increase and there was a strong correlation between the two variables with a significance value of less than 0.05 and a Pearson Correlation value of 0,792.
Cost and benefit battery swapping business model for indonesian electric two-wheeler
Authors: Purnamasari B D , Jamaluddin T A A , Halidah H , Armansyah F
Published: November 2022

Government of Indonesia (GoI) plan to achieve Net Zero Carbon by 2060. One of implementation through Electric Vehicle in the transportation sector where it will drive the reduction of emission and accelerate the demand of global battery. Indonesia has strong position in terms of integrated battery industry. In order to support Electric Vehicle ecosystem, one of value chain related to charging station infrastructures. Nowadays, the charging method for electric vehicles commonly used are battery swapping, conductive and inductive charging. In this paper, we will consider battery charging of electric vehicles, especially electric two-wheeler. In this case, the problem of excessive battery charge time is the main consideration of the users. The development of Battery Swapping Station (BSS) may be an alternative to solving these problems. In the meantime, Battery Swapping Station (BSS) needs a high-level view from stakeholders to understand the cost-benefit ratio of this alternative technology. The objectives of this research are to identify, analyze, and evaluate the current Battery Swapping Station (BSS) technology in market. In this research, it is necessary to have results to establish the policy for manufacture considers large capacity batteries and the standards such as types and specification of batteries as well as swapping stations.
Modeling projection of the number of charging stations and battery electric vehicles until 2030 in Jakarta Indonesia in order to reduce greenhouse gas (GHG) emissions
Authors: Dwiananto Y I , Apriyanto H , Soehadi G , Hadiyati N A , Vitasari A , Wiratmoko A , Heldini N , Suhendra A , Warseno
Published: November 2022

The Government of Indonesia (GoI) has committed to reduce Greenhouse Gas (GHG) emissions by encouraging the acceleration program for battery-based electric motorized vehicles for road transportation through a Presidential Regulation Number 55 of 2019. To accelerate the number of Battery Electric Vehicles (EV), supporting infrastructure is needed such as charging stations. Because with the availability of a sufficient number of charging stations, it will be one of the attractions for people to buy Battery Electric Vehicles. By using the System Dynamics methodology, a projected modeling of the number of Battery Electric Vehicles and Charging Stations (CS) is made until 2030. The increase in the number of Battery Electric Vehicles is influenced by, among others, the price of Battery Electric Vehicles and also the number of Charging Stations themselves. The projection results state that the ratio of the number of charging stations to the number of Battery Electric Vehicles is still far below 1:10. So that the increase in the number of Battery Electric Vehicles must be further improved by lowering the price of Battery Electric Vehicles, one of them.
Model design of geothermal development plan in conservation forest: A case study in Mount Ciremai National Park
Authors: Susila I M A D , Negara I G N S P , Al Irsyad M I , Rasyid H A , Ladiba A
Published: November 2022

In 2019, Indonesia has installed about 2.13 GW of geothermal and made it the second largest country utilizing geothermal. However, the capacity is less than 10% of the total potential and far from the target of 9.3 GW in 2030. A challenge in geothermal development is the environmental issue where more than 50% of the potential is located in conservation and protected forests. Recently, a regulation has been issued allowing geothermal development in those areas. A study to design a model of the forest area management for geothermal development was carried out in the Mount Ciremai National Park by identifying inventorying and evaluating the changes in forest zone utilization. There are three approaches applied in the study: ecology, social, and technical designs. The forest area management model was developed through stages, i.e., clustering of forest utilization and analysis of ecosystem, social activity, and area management alternatives. It is recommended that areas should be avoided are the core zone of the national park, nature preserve, areas that are indicated as important flora and fauna habitats, primary forests, and steeply sloped areas. It is about 1,369 Ha of the area that can be used for geothermal development.
Application of constructed floating wetlands (CFWs) to treat textile effluent
Authors: Henny C , Rohaningsih D , Susanti E , Sumi F , Sudiono BT , Waluyo A
Published: November 2022

Lab-scale constructed floating wetlands (CFWs) using Vetiveria zizanioides and Heliconia psittacorum in a batch mode system was studied to treat textile effluent. The CFW unit (size of 1.8 m x 0.6 m (LxW)) was made with palm fiber media wrapped in the fish net and tied to the PVC pipe frame. Two CFW units were each planted with V. zizanioides, and H. psittacorum, and one CFW unit was without plants as control treatment. Then all CFW units were placed in each microfiber cell with dimensions of 2 m x 0.98 m x 0.60 m (LxWxH). The performance of CFWs was examined for about 21 days with 20 and 50% textile effluent. V. zizanioides and H. psittacorum for both 20% and 50% textile effluent showed good performance in removing ammonia with removal efficiency (RE) ranging from 60 - 80%. Reasonable RE was observed for TN but not for TP and phosphate. The study suggests that both V. zizanioides and H. psittacorum could be potential plants used in the CFW system to treat textile effluent.
Utilization of bagasse ash plus cement to increase the shear strenght of clay soil
Authors: Putri R D , Apriyanti Y , Hambali R
Published: November 2022

Soil shear strength is one of the parameters for assessing the bearing capacity of the soil. Clay soil is a type of soil with poor bearing capacity. To improve the bearing capacity of clay, a mixture of materials can be used as a stabilizing agent. In this study, the mixed material used as a stabilizing agent was bagasse ash plus cement with a percentage of bagasse ash at 5%, 10%, and 15% of the dry weight of the soil. The percentage of cement used is 5% of the dry weight of the soil. Tests were carried out in the form of laboratory tests, sieve analysis, limits of consistency, specific gravity, compaction, and direct shear test. The testing standard uses the Indonesian National Standard (SNI). Soil classification using the Unified Soil Classification System (USCS) method. The results showed that the cohesion and shear angle in the soil increased with the increase in the percentage of bagasse ash plus 5% cement so that the shear strength of the clay also increased from 48.558 kN/m2 for clay without mixture to 71.217kN/m2 with variations of clay mixed with bagasse ash 15% plus cement 5%.
Time series model of forecast electricity energy consumption in Bangka Belitung Province
Authors: Fahria I , Stevanus H
Published: November 2022

Prediction of electricity energy consumption is exceedingly essential to planning and managing electricity system in developing countries. Electricity consumption influences by demographic and macroeconomic indicators, for example population growth and Gross Domestic Product (GDP). The study in this article conducted using one of the most popular time series models, namely Vector Autoregressive Model (VAR). VAR used to take into account the relationship between electricity demand, population number and GDP in Bangka Belitung Province. We analyze the data for the thirdteen-year period from 2007 to 2020 and predicted the results using statistics sotware Eviews. VAR model shows that the increasing population growth from year to year in Bangka Belitung Province, the level of electricity consumption will also increase. Furthermore, GDP shows an up and down trend but does not have a significant effect on the increase in electricity consumption in Bangka Belitung Province, Indonesia.
Sustainable activities of integration agriculture and water system in dryland, Lamandau District, Central Kalimantan (cases study in Bulik Sub District)
Authors: Erlambang Y P , Widjaja E , Utomo B N
Published: November 2022

Integrated farming maximizes revenue from existing resources and increase the benefits of interconnection between business branches, namely vegetables and cattle in the form of increased production yields and reduced production costs. Suboptimal land problems occur due to deficient rainfall so the existence of an embung (small reservoir) as a water provider becomes very important. This study describes the integrated farming system of cattle, vegetables, and embung to increase farm efficiency and farmer income. The material used in this study is embung in the size of 15x40x4 m, 12 tails of cattle for breeding activities, chili plants in size of 600 m2, eggplant in altitude of 600 m2, solid organic fertilizer, and liquid organic fertilizer. Analysis financial of Revenue Cost Ratio was used in the assessment. Financial analysis was carried out on non-organic fertilized and organic fertilizedplants. The average income of each commodity was calculated to determine the total farm income of the integrated activity of vegetables, cattle, and embung. The results showed that farming activities on dry land carried out in integrated farming between plants (vegetables) and cattle provide benefits with an R/C ratio in number of 4,0 for the use organic fertilizer and 2,0 for the use non organic fertilizer. Water from Embung can save of cost up to 13,000,000. With these considerations, integrated farming activities on dry land which was supported by the availability of embung have big potential to be sustainable.
Management blueprint of coastal and marine: concepts of mariculture around sea tin mining activities (case study: Matras Waters, Bangka Belitung Province)
Authors: Pamungkas A , Syarif A F , Manik J D N
Published: November 2022

Bangka Belitung as an archipelagic province has abundant marine natural resources, including tin reserves and mariculture potential, one of which is Matras waters, Bangka Regency. The exploitation of tin mining in coastal areas will have an impact especially decrease the fish abudance at sea. Therefore, this research was carried out to producing the management blueprint of these two activities in the term of sustainability. The methodologies used in this research are analysis of hydro-oceanographic characteristics, sea water quality conditions and the suitability of mariculture on April 2022. Based on the field data, the quality of sea water in Matras waters can be classified as still quite good where only TSS has a value below the sea water quality standard. However, if we look at the aspect of aquaculture suitability, Matras waters still have the potency for mariculture especially at stations 1 and 2 with suitability scores reaching 76 and 78 which are classified as moderately suitable. In addition, if we look at the legal-socio-economy aspect, clear regulations are needed from the government, both central and regional in managing marine utilization areas such as tightening the implementation of the Approval for the Conformity of Marine Spatial Utilization Activities (PKKPRL).
Characterization biodegradable film of ginger nanofiber renvorced PVA bionanocomposites
Authors: Ariksa J , Suhdi  , Setiawan Y , Saparin  , Wijianti E S , Wibowo B S , Yandi W
Published: November 2022

The high demand for degradable transparent films with good physical properties and tensile strength has motivated the development of PVA bionano composites reinforced by ginger nanofibers (GF). Cellulose nanofibers are obtained from ginger pulp fibers. This study’s objective was to describe the PVA/GF bionano composite films’ characteristics. Variations in volume to be used suspension of GF 5, 10 and 15 ml, mixed with PVA gel using ultrasonication. The addition of GF nanofibers into the PVA matrix increased the tensile properties significantly. Bionano composites with 15 ml GF got the best results compared to other volume variations. The film has a 38.5 MPa tensile strength. Meanwhile, the bionano composite films’ transparency was marginally decreased by the inclusion of GF nanofibers. These results indicate that bionano composite films of PVA and GF nanofibers have the potential to be developed in food packaging applications.
Adsorption efficiency of heavy metals (Fe and Zn) in open pit water using Fe3O4/SiO2 nanocomposite from kaolin Bangka
Authors: Asriza RO , Fabiani VA , Julianti E
Published: November 2022

Heavy metals such as Fe and Zn are the dominant heavy metals contained in open pit water. One of the efforts to reduce the level of heavy metal contamination in waters is the adsorption process using nanomaterials. The adsorption of Fe and Zn in open pit water has been carried out using Fe3O4/SiO2 nanocomposites from Kaolin Bangka. Based on XRD characteristics, it shows Fe3O4/SiO2 30% has the smallest average particle size, namely 41.68 nm. The resulting adsorption efficiency is 83.15% for Fe metal and 33.33% for Zn metal.
Probability of failure from plane failure on rock slope in Bukit Nunggal
Authors: Oktarianty H , Pitulima J
Published: November 2022

The problem of slope stability is an important issue because it concerns human safety issues, equipment, buildings and disrupts the smoothness of production. In this research we hope can anticipated failure damage wich interpertation probability of failure. To analyze the stability of the slope can be known through the mechanical properties such as cohesion, friction angle and unit weight of the rock with Point Estimated Method [1] in 3 time standart deviation.The large FK does not represent a more stable slope, because the uncertainty of slope is not captured by the FK value. The slope with FK = 3 does not mean 2 times more stable than FK 1.5 then it is used the probability of sliding formed from some mechanical parameters. Based on the analytic calculation using point estimate method obtained the probability of failure (POF) plane of 0,00004%. Based on the Stacey table (2009) then POF plane 0,00004% can still be accepted.
Environmental management and stakeholder roles in sustainable tourism development: a feasibility study
Authors: Irawan NC , Hartoyo E , Suswadi  , Mustaqim
Published: November 2022

Kemalang District, Klaten, has several ecotourism-based objects, among which the famous ones are Kali Talang, Girpasang Tegalmulyo, and Embung Tirtomulyo. The three objects use natural resources as their main appeal. Thus many tourists pay for environmental services. This research focuses on managing ecosystems and natural tourism items to ensure economic, social, cultural, and ecological sustainability. The analytical approach uses a sustainable natural tourism feasibility model and assesses the role of stakeholders in constructing ecotourism objects. The research uses a purposive technique to identify the research location, then quota sampling to choose 30 for each ecotourism, for a total of 90 respondents. The researcher then continued with the accidental sampling method, the criteria for visitors were already working. This study shows that Girpasang and Kali Talang ecotourism has the potential to be developed and that stakeholders can help promote the sustainable management of ecosystems and tourism attractions. The management system and stakeholder roles for Embung Tirtomulyo ecotourism are not sustainable. Encourage community involvement to strengthen the feasibility and position of stakeholders, notably the unemployed, women, and the private sector.
Recycling of Bangka tin slag used as fine aggregate in hot mix asphalt concrete
Authors: Apriandi M , Safitri R , Yofianti D
Published: November 2022

Bangka Tin Slag is a by-product of tin production on Bangka Island. Meanwhile, tin slag is a waste product from the tin smelting process. Every year, the tin smelting process in Bangka Island produces a large number of slags, while its utilization is still relatively small. On the other hand, the demand for aggregate in road construction has increased from time to time. Recycling tin slag used as fine aggregate in hot mix asphalt can maximize the utilization of tin slag and fill the aggregate demand in the construction. This research aims to substitute the fine aggregate with the tin slag in Asphalt Concrete - Binder Course mixture. In this study, the use of Bangka Tin Slag aggregate in asphalt mixture is 0%, 25%, 50%, 75%, and 100%. Based on the examination in this work, Bangka Tin Slag has a great potential to be used in hot mix asphalt concrete, especially in Asphalt Concrete - Binder Course mixture. The result shows the optimum asphalt contents in this mixture are between 6.25% and 6.5%.
Mapping of environmental conditions in coastal areas on Bangka Island
Authors: Yofianti D , Adriyansyah  , Yusnita M
Published: November 2022

The Province of the Bangka Belitung Islands as one of the provinces in the form of an archipelago has a number of islands that have the potential to be developed, including Bangka Island. The coastal areas on Bangka Island have similar environmental conditions, namely environmental problems due to illegal tin mining. However, the environmental conditions in each of these coastal areas have not been well mapped. Therefore, this study aims to map the environmental conditions in the coastal area of Bangka Island. This study uses a qualitative approach by describing the environmental conditions of the coastal area on the island of Bangka in-detail and in-depth. In addition, this research also communicates directly with informants or officers at the Marine and Fisheries Service and village government officials in the coastal area in question to explore in-depth information. Furthermore, this research data was also obtained from direct observation at the location of the coastal area on the island of Bangka. Through this approach, it is hoped that an overview and understanding of the environmental conditions in coastal areas on Bangka Island can be obtained and how to manage and utilize the potential that has been carried out to improve environmental quality.
The effect of human mobility restriction during the Covid-19 pandemic on the level of environmental damage
Authors: Yofianti D , Safitri R
Published: November 2022

Environmental damage that occurs is generally caused by human activities. The activities carried out lead to mobilities with a tendency to a certain pattern. During the Covid-19 Pandemic, the Indonesian government issued a policy of restricting the human mobility to reduce the spread of the Covid-19 virus. The reduced human mobility in mining activities may lessen the level of environmental damage that occurs. Therefore, this study aims to determine the effect of human mobility restrictions during the Covid-19 pandemic on the level of environmental damage that has occurred. Pangkalpinang City was taken as the location for data collection in this study. Data collection will be undertaken by distributing questionnaires online to people who live in the research location. From the results of the questionnaire, human mobility patterns will be mapped to the activities conducted and the level of environmental damage that has occurred. The results of this study can show the distribution of human mobility patterns to environmental damage that occurred due to policies to restrict human movement during Covid-19 Pandemic.
Predicting particulate matter PM2.5 using the exponential smoothing and Seasonal ARIMA with R studio
Authors: Amelia R , Guskarnali  , Mahardika R G , Niani C R , Lewaherilla N
Published: November 2022

In general, public awareness of air quality in Indonesia is increasing. In accordance with the average concentration of particular PM2.5, air quality in Indonesia has improved from 2020 to 2021. However, in some densely populated cities, poor air quality still occurs continuously, for example Jakarta. PM2.5 pollution prediction will be made using monthly data with a case study Jakarta using the time series method, Exponential Smoothing and Seasonal ARIMA model in R studio. In accordance with the analysis, it is found that the Triple Exponential Smoothing and Seasonal ARIMA (0,1,1)(1,1,1)(12) were chosen to be the selected models. When compared to the actual data, they fluctuate move following the actual data. However, when viewed from the average percentage difference with the actual data, the model whose data is close to the actual data is the Seasonal ARIMA model. It is hoped that by knowing the PM2.5 particulate time series model in Jakarta, it can be used as consideration for predicting the monthly average PM2.5 so that it can be seen which months have the highest PM2.5. So that some people who experience respiratory problems, can predict the highest PM2.5 condition and can anticipate early in case of unhealthy air conditions.
Identification of kaolin mineralization in Bintet Village, Belinyu Subdistrict
Authors: Franto  , Mardiah
Published: November 2022

This research was conducted in geological investigations carried out by field mapping, drilling, geoelectric tests, and geochemical tests. Based on the result of geoelectric test, it can be known that the potential of kaolin deposits found at depths from 2 to 4 meters with thickness of kaolin up to 18 meters. The results of geochemical tests of drill samples show the percentage of kaolinite is 98,2% and silicon dioxide 1,8 %.
Designing monitor and control system of internet of things (IoT) based solar powered smart greenhouse prototype
Authors: Anuar S , Puriza M Y , Yandi W , Rachmani A A , Anzari Y
Published: November 2022

This study aims to produce a prototype of greenhouse system which is used for nursery that can be maintained and controlled remotely. The design and control employs power supply from solar panels and applies ESP-32 as a data processor which will be sent on Telegram App. Controlling and monitoring in this study are observed from the comparison between temperature, growth, and plant weight which are performed both automatically in a smart greenhouse and manually cultivated in non-greenhouse. The results obtained at the highest temperature of the smart greenhouse was on the 19th day of testing was 36.10°C and for the manually cultivated in non-greenhouse the temperature was 34.65°C on the 16th day. The lowest temperature for the smart greenhouse was on the 27th day of testing which was 27.51°C and for the manually cultivated in non-greenhouse was 26.64°C. As a result, the plants growth for each treatment increased every week. Plants growth in the smart greenhouse is higher than the growth rate in the manually cultivated in non-greenhouse. Plants weight that had measured are averagely 159 grams in smart greenhouse and 123 grams for the manually cultivated in non-greenhouse.
Terahertz characterizations of solution-processed Ni-doped, Cu-doped, and undoped ZnO nanoparticles
Authors: Jana Arun , Das Tapas , Rane Shreeya , Devi Koijam Monika , Guchhait Asim , Chowdhury Dibakar Roy
Published: November 2022

We present experimental studies on doped and undoped ZnO nanoparticles prepared via cost-effective solution processing techniques towards its applicability for terahertz frequency domain. Scanning electron microscopy (SEM) confirms that the dimensions of synthesised particles spread over 120–275 nm, while x-ray diffraction (XRD) along with energy dispersive x-ray (EDX) characteristics manifests the presence of the desired materials for doped as well as undoped nanoparticles. Further, terahertz-time domain spectroscopy (THz-TDS) data are recorded in transmission mode which are employed to extract several optical parameters (viz. refractive index, conductivity, etc) of the nanoparticulate films spanning the frequency range from 0.2 to 0.9 THz. Doped samples clearly manifest enhanced conductivities because of the presence of metallic components. Cost-effective synthesis of ZnO nanoparticles can be useful for terahertz photonics in future.
Activation region overlap visualization for image-guided cochlear implant programming
Authors: Bratu Erin L , Sunderhaus Linsey W , Berg Katelyn A , Dwyer Robert T , Labadie Robert F , Gifford René H , Noble Jack H
Published: November 2022

Objective. The cochlear implant is a neural prosthesis designed to directly stimulate auditory nerve fibers to induce the sensation of hearing in those experiencing severe-to-profound hearing loss. After surgical implantation, audiologists program the implant’s external processor with settings intended to produce optimal hearing outcomes. The likelihood of achieving optimal outcomes increases when audiologists have access to tools that objectively present information related to the patient’s own anatomy and surgical outcomes. This includes visualizations like the one presented here, termed the activation region overlap image, which is designed to decrease subjectivity when determining amounts of overlapping stimulation between implant electrodes. Approach. This visualization uses estimates of electric field strength to indicate spread of neural excitation due to each electrode. Unlike prior visualizations, this method explicitly defines regions of nerves receiving substantial stimulation from each electrode to help clinicians assess the presence of significant overlapping stimulation. A multi-reviewer study compared this and an existing technique on the consistency, efficiency, and optimality of plans generated from each method. Statistical significance was evaluated using the two-sided Wilcoxon rank sum test. Main results. The study showed statistically significant improvements in consistency (p < 10–12), efficiency (p < 10−15), and optimality (p < 10−5) when generating plans using the proposed method versus the existing method. Significance. This visualization addresses subjectivity in assessing overlapping stimulation between implant electrodes, which currently relies on reviewer estimates. The results of the evaluation indicate the provision of such objective information during programming sessions would likely benefit clinicians in making programming decisions.