Potential of New and Renewable Energy in Merauke Regency as the Future Energy

Electricity consumption in Merauke Regency increases every year in line with economic growth and population growth. Meanwhile, fossil energy reserves as fuel for power plants have decreased. To reduce dependence on fossil energy and offset the increase in electricity consumption it is necessary to develop alternative electrical energy sourced from renewable energy. Merauke Regency has great potential for renewable energy derived from biomass, solar, and wind. A study or analysis is needed to be able to estimate the energy potential that can be developed in an area. This study uses data collection techniques and analysis of the potential for renewable energy in Merauke Regency using RETScree…

Klimats un ilgtspējīga attīstība

Geographic Information System of Primary Carbon Deposit of Mangrove Forest in Merauke District, Indonesia

Emission factors with increasing carbon dioxide (CO2) originating from various human activities are one of the causes of global climate change. The mangrove forest is a type of plant that has a great ability to absorb carbon in the atmosphere and store it in biomass through photosynthesis. Merauke Regency has 20 separate parts based on regional administration, but primary Mangrove forests are only found in ten regions (district). The results of research carried out using geographic information systems (GIS) in processing primary Mangrove forest data based on 2016 land cover map data in Merauke district, the area of primary mangrove forest reaches 184.402 ha, which is spread in various regio…

Smart Micro-Grid Performance using Renewable Energy

The aim of this research is to determine the performance of PV panels, wind turbines, battery storage and power imported from the grid to the system which will ensure a reliable energy supply, as well as the technical feasibility of a smart microgrid system. Indonesia’s renewable energy potential for electricity reaches 443 GW, where solar energy is the largest potential, namely 4.8 KWh m–2 or equivalent to 112 000 GWp, but only 10 MWp has been utilized. The most basic problem in this system, namely, the uncertainty of wind energy and solar energy, one of the most vital factors in the optimal size of a renewable energy-based smart microgrid system is the reliability of the system being buil…

Determinant Factors in Purchasing Korean Skin Care Products

The demand and business opportunities in the skin and facial beauty sector have increased in the last 10 yr. The beauty and personal care industry in Indonesia grows on average of 12 %, with a market value of 33 × 109. This research emphasizes the presence of the influence of attitude, subjective norm, and perceived behavioral control on the purchase intention of skincare products that are moderated by the country of origin. The data collection is conducted by distributing questionnaires to a total of 130 respondents. Data obtained through a questionnaire are then processed with Smart Partial Least Square (PLS). The results in this study prove that the attitude and perceived behavioral cont…

Effectiveness the source of nitrogen from NO3 and NH4 for Panicum maximum Jacq. growth in saline soil

Abstract The purpose of this study was to determine the source of nitrogen used by Panicum maximum Jacq. plants in salt soil. Experimenting pots in a greenhouse with a medium of saline soil. The 2 × 3 factorial design is used in repeated trials. The first factor is calcium sulfate (0 and 2 t ha−1), the second factor is N fertilizer includes (a) without nitrogen = N0, (b) 60 kg N of potassium nitrate (KNO3) and (c) 60 kg N of ammonium sulfate (NH4SO4). The parameters observed were nitrogen uptake, constant growth rate (CGR), biomass yield, crude protein content, NDF, and ADF. The interaction of calcium sulfate and nitrate fertilizer increases CGR, biomass yield, N, CP and NDF uptake. Interac…

Vides apstākļu ietekme uz mikro- un makroelementu saturu pārtikas produktos Latvijā

Anotācija Bez vitāli svarīgo mikro- un makroelementu ieneses pārtikā no vides (augsnes, ūdens un gaisa) ir iespējams arī barības ķēdes, t. sk., pārtikas piesārņojums ar toksiskiem vai potenciāli toksiskiem elementiem, piemēram, As, Cd, Hg, Pb. Promocijas darba mērķa ietvaros tika veikta Latvijā iegūtu pārtikas produktu paraugu mikro- un makroelementu sastāva kvantitatīvā analīze, lai noskaidrotu vides apstākļu ietekmi uz elementu koncentrāciju un ieneses ceļiem pārtikā. Papildus, lai vērtētu elementu biopieejamību barības ķēdē, tika veikta eksperimentāla pārtikas kultūraugu audzēšana mākslīgi piesārņotā augsnē. Iegūtie dati liecina par vairāku dabiskas un antropogēnas izcelsmes vides apstāk…

Measuring Repurchase Intention on Fashion Online Shopping

The internet has become one of many ways for consumers to shop. With the rapid development of internet connection, online shopping has become increasingly popular around the world. All forms of conveniences available through online businesses have lured consumers to switch from offline shopping to online slowly. This research emphasizes the influence of e-service convenience on customer satisfaction, perceived service value, and repurchase intention on fashion online shopping websites in Surabaya. The sample is taken from 115 Surabaya respondents. The sampling technique uses a non-random sampling technique. The analytical method used is the partial least square (PLS). The results show that …

Renewable Energy Technologies for Economic Development

Indonesian villages are facing dangerous condition. Every year, young people are deserting the villages. To overcome this problem, Tangsi Jaya hamlet, West Java, has been provided with 18 kW micro-hydro to supply electricity both to the community and to Small Processing Center for ground coffee production. Results of cash flow analysis for ground coffee in Tangsi Jaya hamlet, with total investment of IDR 110 750 000 and discount rate of 18 % for 5 yr. Banyumeneng I hamlet, Yogyakarta with an investment cost IDR 95 000 000 and production cost of IDR 34 195 000 yr–1 and the interest rate of 14 % yr–1, the payback period was estimated to be 3 yr with ROI of 40 %. PEST analysics indicate that t…

Concentration of Potentially Toxic Elements in Various Berries Grown in Allotment Gardens of Rīga City, Latvia

Abstract Concentration of trace and major elements is an important indicator of nutritional value of food, also regarding cultivated food crops like fruits, berries, and vegetables. Concentration of elements differs regionally and is influenced by various factors. Nevertheless, some chemical elements (As, Cd, Hg, Ni, Pb, Zn, etc.) are known as environmental pollutants and may affect the quality and safety of crops and food products. The aim of the study was to determine the concentration of potentially toxic elements like Cd, Cr, Cu, Fe, Ni, Pb, and Zn in samples of berries grown in allotment gardens of Rīga city. Dried and homogenised samples of raspberries, strawberries, red currants, bla…

Dzīves cikla analīze enerģijas un biogēno elementu izmantošanas optimizācijai atkritumu pārstrādē Rīgā

Racionāla atkritumu pārstrāde ir potenciāls enerģijas, kā arī biogēno elementu ieguves avots, it īpaši laikā, kad pasaules fosilā kurināmā rezerves sāk izsīkt. Maģistra darba autore ir izstrādājusi modeli, ar kura palīdzību, izmantojot dzīvescikla analīzes pieeju, iespējams aprēķināt enerģijas bilanci, biogēno elementu ieguves potenciālu, kā arī siltumnīcas efektu izraisošo gāzu emisijas saskaņā ar 15 dažādiem organisko atkritumu pārstrādes scenārijiem. Modelis sniedz iespēju novērtēt pozitīvos un negatīvos aspektus, ko atkritumu pārstrādē rada tādi procesi, kā transportēšana, apglabāšana izgāztuvē ar vai bez metāna utilizācijas, biogāzes ieguve, atkritumu sadedzināšana, kompostēšana un ies…