Pengembangan Potensi Desa Nusa Sebagai Kawasan Destinasi Wisata Terpadu Berbasis Mobile Android

Nusa Village's local potential continues to be realized into various tourist attractions with the primary goal of improving the community's economy and maintaining environmental sustainability. Processing goods made from organic waste, culinary tours, homestays, and beautiful scenery with village nuances are some of the potentials in the village of Nusa. Many things can be grown in Nusa village; it is appropriate to promote and serve as an integrated tourist destination. The goal of this research is to use information technology to increase the potential of Nusa Village as an integrated tourist destination area. One application of information technology is the use of Geographic Information System (GIS) and Android mobile devices. Looking at the potential condition of the Nusa Tourism Village, it is a form of community empowerment that prioritizes sustainable development goals in order to increase people's income. Based on the potential of Nusa Village, it should be used as an integrated tourist destination area in Aceh Besar, so it is necessary to have supporting facilities, provide information to tourists, create a form of promotional media, and also a marketplace to sell handicrafts, so that it has a place to sell works. It is hoped that the development of this application will help to increase people's income in the aftermath of COVID-19. This research yields an android-based application, which will be used by the village of Nusa to map the location of tourism potential, and then by the women's group Nusa Creation Community (NCC), which creates handicrafts. They can be sold by the craftsmen through this marketplace system. This application provides tourists with information so that they can easily visit all destinations, and tourists can use it to buy handicrafts in a system

Investigation of heavy metals on water quality and sediment: A case study Bireuen, Aceh Utara and Lhokseumawe City

Environmental pollution around the world in the last 10 years has continued to increase with increasing industrial growth. Environmental pollution has reduced the availability of clean water. Clean water is the main thing for all living things on this earth. Therefore, environmental pollution that occurs in the clean water crisis must be handled as soon as possible and reduced by various effective policies. The main focus of this research is to analyze heavy metal pollution on the surface of the water, clean water, and sediments caused by industrial activities. This research is a field study by taking samples directly at the location and then analyzing them in the laboratory. The results of the analysis showed that the highest heavy metal Fe on the water surface was found in Bireuen Regency by 0.28% compared to Lhokseumawe City with 0.0029% and Aceh Utara 0.0029%. Meanwhile, the highest heavy metals contained in clean water were recorded in Bireuen and Lhokseumawe City at 0.007% and 0.0064%, respectively. The results of the heavy metal analysis in the highest sediment were found in North Aceh at 42.93% compared to 8.02% and 18.12% for Bireuen and Lhokseumawe. Overall, the analysis carried out in this study shows that the surface water, clean water, and sediments have been contaminated by heavy metals. Meanwhile, the quality standard for surface water is 0.3 mg/l, net ai is 1.0 mg/l, and sediment is 20bj

Efficient hydrogen production by microwave-assisted catalysis for glycerol-water solutions via NiO/zeolite-CaO catalyst

Hydrogen from glycerol is one of the most potent green energy sources to replace fossil fuels. Thus, converting a glycerol solution to hydrogen through microwave-assisted catalysis is continuously gaining interest from researchers worldwide. The research aim was to combine NiO/zeolite and CaO for efficient hydrogen production from glycerol-water solution via microwave-assisted. The BET, XRD, and TEM were applied to characterize the properties of the NiO/zeolite-CaO catalyst. The influence of CaO content on NiO/zeolite (NiO/zeolite-CaO) catalyst, and microwave power on glycerol-water decomposition into hydrogen were investigated systematically. The catalytic performance for hydrogen production from glycerol-water solution was conducted in a fixed bed quartz-tube flow reactor via microwave irradiation a fed flow-rate (FFR) of 0.5 ml/min. Several characteristics, such as heating rate of 300–600 W, have been studied, CaO content of 10 wt.%, 30 wt.%, 40 wt.%, 50 wt.%, 60 wt.%, and 100 wt.%, respectively. The combined utilization of NiO/zeolite and CaO was efficient in obtaining more hydrogen production. Furthermore, the maximum conversion was found to be around 98.8%, while the highest hydrogen purity was found to be up to 96.6% when 20 wt.% NiO was used as an active site on natural zeolite and 50 wt.% CaO was used

Modification of perforated plate in fluidized-bed combustor chamber through computational fluid dynamics simulation

The combustion of solid fuels in a combustion chamber can be perfect if all the fuel included can burn out, and nothing remains. The combustion chamber requires sufficient air to burn all the fuel; therefore, meeting the air supply requires modifications with various considerations. The perforated plate modeled through computational fluid dynamics (CFD) was modified to investigate the excess air supply into the combustion chamber. The CFD simulation modeled in this study was used to validate the results of the experiments carried out with the previous fluidized-bed combustor technology. The simulation results show that the temperature increased for all fuels tested in geometry-2 compared with geometry-1. The best boiler efficiency from the simulation results is in geometry-1 for 45% oil palm midrib fuel with a mass flow rate of 7.78 kg/s. The maximum radiation was recorded from geometry-2 at a variation of 66.939 W/m2, with a heat loss level of 1.10 W/m2. Overall, the simulation was performed by modifying the fuel floor plate in geometry-2 to increase the temperature and radiation with lower heat loss

Modification of perforated plate in fluidized-bed combustor to provide sufficient air supply in the combustion

The modification of the perforated plate applied in this study aims to provide sufficient air access into the combustion chamber. Burning experiments were carried out with three different types of fuel (such as palm kernel shell (PKS), oil palm midrib (OPM), and empty fruit bunches (EFB). The purpose of the experiment with the modification of the perforated plate is to investigate the combustion temperature and the rate of heat transfer in the boiler. The fluidized-bed combustor (FBC) combustion chamber is used as the combustion chamber. Experimental results were obtained at four different points using a Digital Thermometer with a thermocouple. The experimental results show that the highest heat transfer rate is obtained from PKS fuel of 8.258 W/m for the M-1 measurement point. The measurement results on the M-2 highest heat transfer rate were recorded from OPM fuel of 7.392 W/m. The highest combustion temperature is obtained from OPM fuel, which is 884oC for the M-1 measurement point. The combustion temperature of the PKS combustion process is slightly higher at 896oC. However, the combustion temperature produced during the combustion of PKS shows a less good trend than OPM. Overall, the fuel used in this test can be completely burned and unsaturated by providing sufficient air supply into the combustion chamber. Modification of the perforated plate with the addition of air supply in the combustion chamber is a novelty found in this study

Comparison of temperature, radiation rate, heat loss, furnace and thermal efficiencies of different plates in the FBC combustion chamber

The conversion of solid biomass waste into energy continues to be developed at this time to reduce dependence on fossil energy. Energy conversion can be carried out using several technologies commercialized by several industries, including the fluidized-bed combustor (FBC). This FBC technology has also been developed in several ways, such as the modification or unique modelling. In particular, the perforated plate modelling applied in this study is to provide excess air supply so that complete combustion can be achieved. In addition, modifying the perforated plate increases efficiency and radiation and reduces heat loss in the FBC combustion chamber. This research was conducted with combustion experiments using palm kernel shell (PKS), oil palm midrib (OPM), and empty fruit bunches (EFB) against different plates. Experimental results show that the maximum temperature achieved on the modified four guide plates is 975°C for PKS fuel, 850°C OPM, and 883°C EFB with 20%-70% excess air. The results of the highest furnace efficiency on the four guide plate modifications were 91.44% PKS, 73.48% OPM, and 77.63% EFB. Meanwhile, the highest efficiency recorded from modifying the four guide plates for each fuel was 84% PKS, 73% OPM and 74% EFB. The highest radiation rates were recorded at 7745.21 W/sec PKS, 5971.17 W/sec OPM, and 6356.12 W/sec EFB. The perforated plate modification applied in the FBC combustion chamber can reduce heat loss significantly compared to when implementing standard plates

Investigation of the effect biodiesel-butanol-water fuel blend pressure on a single-cylinder diesel engine

Energy demand from the community, which continues to increase has resulted in depletion of petroleum (fossil) energy in recent years. Many researchers have sought to find alternative fuels to replace dependence on conventional energy. The mixing of alcohol into diesel fuel has also been carried out by several previous researchers. The main focus of this research is to investigate the combustion performance of diesel engines using a mixture of biodiesel-butanol-water and diesel (B5Bu5W5). This research experiment used a single-cylinder diesel engine with different speeds at 25% and 50% engine load. The experimental results show that the maximum cylinder pressure reaches 72.32 bar when the engine load reaches 50%. While at 25% engine load press the maximum cylinder 33.62 bar. The heat dissipation for 50% engine load is also higher than the engine load 25% respectively 34.39% and 33.62%. Overall results show that cylinder pressure increases when the load and engine speed increase. However, the combustion time is a little slower than when using pure diesel fuel

Policies and laws in the application of renewable energy Indonesia: A reviews

Renewable energy is a global energy system that is very important in nature and humans' harmonious and conducive development. Considerable attention from the government towards renewable energy is due to the increasing energy demand. The impact of the current energy shortage has also resulted in damage to the environment. The current legal framework for accelerating the development of renewable energy has made a considerable contribution but is still not in favor of investors. Thus, the integration of renewable energy into the national energy system is still far from being expected, so the cooperation between the government and industrial development must be further enhanced. The specific aim of this work is to adopt various practices and policies towards the development of renewable energy from several developing countries. A critical review of this work will discuss policies and legislation on renewable energy policies especially under-operation, fragmentation, and obsolescence. Policies in favor of renewable energy developers are also presented in this paper. This paper as a whole investigates various renewable energy development policies from developing countries to be adopted in ensuring the availability of energy security in the future

Experimental studies on combustion characteristics of oil-palm biomass in fluidized-bed: a heat energy alternative

One of the technologies that can be used to meet energy needs is biomass combustion. In this study, the oil palm biomass fuels used were empty fruit bunches, oil palm fibers, oil palm midribs, and palm kernel shells. This research was carried out by a direct combustion method using a fluidized-bed combustor. The purpose of this experiment was to investigate the reaction of kinetics and the mechanism of combustion of oilpalm biomass in fluidized-bed combustor. The characteristics observed in this test were the combustion temperature profile, flue-gas composition, and the composition of the ash-deposit chemical compound. The results of the experiments conducted showed that the best biomass combustion temperature profile was recorded at 2 kg biomass with an air flow rate of 0.9375 m3/s at 90.1%. The maximum temperature of biomass combustion recorded at biomass 3 kg with an air flow rate of 1.25 m3/s are 950°C (95%). The higher conversion combustion of biomass was found at biomass condition of 3 kg with an air flow rate of 0.9375 m3/s. The value of O2 emissions from biomass combustion shows that it was very small 0.2%. While the highest CO2 value was recorded at 19.9%. The highest combustion efficiency on FBC found 1 kg of biomass fuel with an air flow rate of 0.0654 m3/s recorded 94.9%