scholarly journals Ecological Mapping for the Development of Salt Production Centres in Indonesia during the Dutch Colonial Era

2021 ◽  
Vol 317 ◽  
pp. 04024
Author(s):  
M. Zaki Mahasin ◽  
Yety Rochwulaningsih ◽  
Singgih Tri Sulistiyono
Keyword(s):  
Wind Speed ◽  
Coastal Area ◽  
Sea Water ◽  
North Coast ◽  
Average Wind Speed ◽  
Ecological Mapping ◽  
Salt Production ◽  
Air Temperatures ◽  
Colonial Government ◽  
Dutch Colonial

This paper examines why the Dutch colonial government did ecological mapping for the development of salt centres in Indonesia and how it was carried out? It is analysed by historical method which includes heuristics, criticism, interpretation and historiography. Ecological mapping was carried out by the Dutch colonial government for the development of salt production centre sourced from sea water. It is the important factor to develop salt production centres concerning the situations of the coastal area in which sloping parallel to sea level, humid, dry air temperatures, low rainfall, non-porous soil types, and high wind speeds. The wind speed required for salt production is at least 5 m/sec, with air temperatures above 32o C during the day, as well as a maximum humidity of 50%. During the Dutch colonial government, it was recorded that in 1904-1917 the average wind speed was above 5 m/sec. Continued with the development of the salt production ecosystem, which includes the establishment of production areas equipped with bozem development, land layout, etc. By the ecological mapping, the salt development centre areas cover coastal area of Madura, several areas of Java’s north coast, and coastal areas of Sulawesi, including Jeneponto.

Characterizing the convective heat exchange with plastic shading nets under natural arid conditions

2019 ◽  
pp. 11-20
Author(s):  
Ahmed M Abdel-Ghanya ◽  
Ibrahim M Al-Helal
Keyword(s):  
Wind Speed ◽  
Thermal Radiation ◽  
Convective Heat ◽  
Convective Heat Transfer Coefficient ◽  
Convective Heat Exchange ◽  
Radiative Properties ◽  
Wooden Frame ◽  
Arid Conditions ◽  
Air Temperatures ◽  
Radiation Fluxes

Plastic nets are extensively used for shading purposes in arid regions such as in the Arabian Peninsula. Quantifying the convection exchange with shading net and understanding the mechanisms (free, mixed and forced) of convection are essential for analyzing energy exchange with shading nets. Unlike solar and thermal radiation, the convective energy, convective heat transfer coefficient and the nature of convection have never been theoretically estimated or experimentally measured for plastic nets under arid conditions. In this study, the convected heat exchanges with different plastic nets were quantified based on an energy balance applied to the nets under outdoor natural conditions. Therefore, each net was tacked onto a wooden frame, fixed horizontally at 1.5-m height over the floor. The downward and upward solar and thermal radiation fluxes were measured below and above each net on sunny days; also the wind speed over the net, and the net and air temperatures were measured, simultaneously. Nets with different porosities, colors and texture structures were used for the study. The short and long wave’s radiative properties of the nets were pre-determined in previous studies to be used. Re and Gr numbers were determined and used to characterize the convection mechanism over each net. The results showed that forced and mixed convection are the dominant modes existing over the nets during most of the day and night times. The nature of convection over nets depends mainly on the wind speed, net-air temperature difference and texture shape of the net rather than its color and its porosity.

SHAPING OF AN AUTONOMOUS POWER SYSTEM FOR GUARANTEED POWER SUPPLY WITH THE PREDOMINANCE WIND ENERGY

2018 ◽  
pp. 28-50
Author(s):  
S. G. Ignatiev ◽  
S. V. Kiseleva
Keyword(s):  
Energy Storage ◽  
Wind Speed ◽  
Wind Energy ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Energy Demand ◽  
Diesel Generator ◽  
Average Wind Speed ◽  
Wind Speeds ◽  
Average Wind

Optimization of the autonomous wind-diesel plants composition and of their power for guaranteed energy supply, despite the long history of research, the diversity of approaches and methods, is an urgent problem. In this paper, a detailed analysis of the wind energy characteristics is proposed to shape an autonomous power system for a guaranteed power supply with predominance wind energy. The analysis was carried out on the basis of wind speed measurements in the south of the European part of Russia during 8 months at different heights with a discreteness of 10 minutes. As a result, we have obtained a sequence of average daily wind speeds and the sequences constructed by arbitrary variations in the distribution of average daily wind speeds in this interval. These sequences have been used to calculate energy balances in systems (wind turbines + diesel generator + consumer with constant and limited daily energy demand) and (wind turbines + diesel generator + consumer with constant and limited daily energy demand + energy storage). In order to maximize the use of wind energy, the wind turbine integrally for the period in question is assumed to produce the required amount of energy. For the generality of consideration, we have introduced the relative values of the required energy, relative energy produced by the wind turbine and the diesel generator and relative storage capacity by normalizing them to the swept area of the wind wheel. The paper shows the effect of the average wind speed over the period on the energy characteristics of the system (wind turbine + diesel generator + consumer). It was found that the wind turbine energy produced, wind turbine energy used by the consumer, fuel consumption, and fuel economy depend (close to cubic dependence) upon the specified average wind speed. It was found that, for the same system with a limited amount of required energy and high average wind speed over the period, the wind turbines with lower generator power and smaller wind wheel radius use wind energy more efficiently than the wind turbines with higher generator power and larger wind wheel radius at less average wind speed. For the system (wind turbine + diesel generator + energy storage + consumer) with increasing average speed for a given amount of energy required, which in general is covered by the energy production of wind turbines for the period, the maximum size capacity of the storage device decreases. With decreasing the energy storage capacity, the influence of the random nature of the change in wind speed decreases, and at some values of the relative capacity, it can be neglected.

scholarly journals Analysis of Performance of the Wind-Driven Pulverizing Aerator Based on Average Wind Speeds in the Conditions of Góreckie Lake

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2796
Author(s):  
Andrzej Osuch ◽  
Ewa Osuch ◽  
Stanisław Podsiadłowski ◽  
Piotr Rybacki
Keyword(s):  
Mathematical Model ◽  
Wind Speed ◽  
Water Pump ◽  
Average Wind Speed ◽  
Flow Rates ◽  
Wind Speeds ◽  
Average Wind ◽  
Flow Through ◽  
Analysis Of Performance ◽  
Research Period

In the introduction to this paper, the characteristics of Góreckie lake and the construction and operation of the wind-driven pulverizing aerator are presented. The purpose of this manuscript is to determine the efficiency of the pulverizing aerator unit in the windy conditions of Góreckie Lake. The efficiency of the pulverization aerator depends on the wind conditions at the lake. It was necessary to conduct thorough research to determine the efficiency of water flow through the pulverization segment (water pump). It was necessary to determine the rotational speed of the paddle wheel, which depended on the average wind speed. Throughout the research period, measurements of hourly average wind speed were carried out. It was possible to determine the efficiency of the machine by developing a dedicated mathematical model. The latest method was used in the research, consisting of determining the theoretical volumetric flow rates of water in the pulverizing aerator unit, based on average hourly wind speeds. Pulverization efficiency under the conditions of Góreckie Lake was determined based on 6600 average wind speeds for spring, summer and autumn, 2018. Based on the model, the theoretical efficiency of the machine was calculated, which, under the conditions of Góreckie Lake, amounted to 75,000 m3 per year.

Investigation on dust dispersion during support movement in a fully mechanized mining face and the technology with support frame enclosure dust control

2021 ◽  
pp. 095440892110311
Author(s):  
Jinming Mo ◽  
Wei Ma ◽  
Dandan Li ◽  
Sheji Zhang
Keyword(s):  
Wind Speed ◽  
Field Application ◽  
Dust Concentration ◽  
Dust Control ◽  
Average Wind Speed ◽  
Dust Source ◽  
Air Inlet ◽  
Support Frame ◽  
Site Field ◽  
Mining Face

A fully mechanized mining face is characterized by serious dust pollution and dust is a major cause of pneumoconiosis that haunts numerous miners. For a fully mechanized face having large mining heights, the main dust source in the pavement area is produced by the moving support frame. To reduce the amount of dust during support's movement, the distribution and dissipation of dust in this process were studied by combining numerical simulations with underground measurements. The results showed that with an increase of the distance from the air inlet, the wind speed of the sidewalk in the fully mechanized face first increased, then decreased, and finally increased again. At the position of the coal cutter, the highest wind speed was 1.78 m/s and the average wind speed of the roadway was about 0.8 m/s. The dust concentration at the dust source was >1000 mg/m3. An area with a high dust concentration and having a length of 15 m was formed on the rooftop, together with a 50 m long dust belt with a dust concentration of 300 to 450 mg/m3 in the pavement area of 10 m from the dust source. Beyond the 45 m radius from the dust source, the dust concentration was stable at about 250 mg/m3. Based on the dust production characteristics of the support frame, an enclosed dust-guiding device was designed and structure-optimized. Based on the on-site field application test results, it was found that the device has a satisfactory dust-guiding effect during support movement and the dust suppression rate near the dust source reached 94.8%.

Calculation of Weibull Distribution parameters at low wind speed and performance analysis

2021 ◽  
pp. 1-24
Author(s):  
Yusuf Alper Kaplan
Keyword(s):  
Wind Speed ◽  
Wind Energy ◽  
Weibull Distribution ◽  
Energy Potential ◽  
Average Wind Speed ◽  
Statistical Indicator ◽  
Low Wind Speed ◽  
Distribution Parameters ◽  
Wind Energy Potential ◽  
And Performance

In this study, the compatibility of the real wind energy potential to the estimated wind energy potential by Weibull Distribution Function (WDF) of a region with low average wind speed potential was examined. The main purpose of this study is to examine the performance of six different methods used to find the coefficients of the WDF and to determine the best performing method for selected region. In this study seven-year hourly wind speed data obtained from the general directorate of meteorology of this region was used. The root mean square error (RMSE) statistical indicator was used to compare the efficiency of all used methods. Another main purpose of this study is to observe the how the performance of the used methods changes over the years. The obtained results showed that the performances of the used methods showed slight changes over the years, but when evaluated in general, it was observed that all method showed acceptable performance. Based on the obtained results, when the seven-year data is evaluated in this selected region, it can be said that the MM method shows the best performance.

SEJARAH KAMPUNG PONDOL DAN KOMUNITAS EKSIL MUSLIM DI KOTA MANADO

2020 ◽  
Vol 5 (2) ◽  
Author(s):  
Roger Allan Christian Kembuan
Keyword(s):  
Historical Method ◽  
National Archives ◽  
Colonial Archives ◽  
The Republic ◽  
Xix Century ◽  
Colonial Government ◽  
The 19Th Century ◽  
The Impact ◽  
New Location ◽  
Dutch Colonial

Abstract: This research discusses the process of forming and developing of Pondol village in Manado as a location for exile along with the Dutch colonial government policy that placed exiles who came from several sultanates in Java in the Manado Residency during the 19th century. The discussion includes, first, the background of the exile of the Javanese aristocrats in Manado. Second, the process of establishing Pondol as a location for exile and its development during the XIX century, and third, the adaptations made by the exiles to adjust to their exile and the impact of their arrival on the Manado-Minahasa community. The historical method is used in this research, using colonial archives from the XIX century which are stored in the National Archives of the Republic of Indonesia, and local sources, especially manuscripts stored by their descendants in Manado and Java. The findings in this study are; Kampung Pondol was formed due to the isolation of Kanjeng Ratu Sekar Kedaton and Pangeran Suryeng Ingalaga and some of his followers originated from political intrigue that occurred in the Sultanate of Yogyakarta. Second, the reason why Kampung Pondol was chosen as the new location for exile by the Dutch colonial government for Javanese royal officials was different from the exile of other figures in Tondano and Tomohon. Third, the form of adaptation carried out by the exiles in Kampung Pondol Manado was marriage with women from Manado and relationships with Dutch people who lived around them.Keywords : Exile, Javanese Noble, Pondol Village, Adaptation. Abstrak: Penelitian ini membahas tentang proses terbentuk dan perkembangan kampung Pondol di Manado sebagai lokasi pengasingan seiring dengan kebijakan pemerintah kolonial Belanda yang menempatkan para eksil yang berasal dari beberapa kesultanan di Jawa di Karesidenan Manado pada sepanjang abad 19.  Pembahasannya meliputi; Pertama, Latar belakang pengasingan para bangsawan Jawa di Manado. Kedua, proses terbentuknya Pondol sebagai lokasi pengasingan dan perkembangannya selama abad XIX, dan Ketiga, adaptasi yang dilakukan para eksil untuk menyesuaikan diri di pengasingan serta dampak kedatangan mereka pada masyarakat Manado-Minahasa. Metode sejarah dipergunakan dalam penelitian ini, dengan mempergunakan sumber Arsip Kolonial kurun waktu abad ke XIX yang tersimpan di Arsip Nasional Republik Indonesia,  dan sumber lokal terutama manuskrip yang tersimpan oleh keturunannya di Manado dan Jawa. Temuan dalam penelitian ini adalah; Kampung Pondol terbentuk karena Pengasingan Kanjeng Ratu Sekar Kedaton dan Pangeran Suryeng ingalaga dan beberapa pengikutnya berawal dari intrik politik yang terjadi di Kesultanan Yogyakarta. Kedua, alasan Kampung Pondol dipilih sebagai lokasi baru pengasingan Pemerintah Kolonial Belanda bagi pembesar kerajaan Jawa yang berbeda lokasi dengan pengasingan tokoh-tokoh lainnya di Tondano dan Tomohon. Ketiga, bentuk adaptasi yang dilakukan oleh para eksil di Kampung Pondol Manado dilakukan pernikahan dengan wanita dari Manado dan relasi dengan orang-orang Belanda yang tinggal disekeliling mereka.Kata Kunci : Eksil, Bangsawan Jawa, Kampung Pondol, Adaptasi.

The Combination Process between Disc-Mill and Distillation Evaporation in Producing Salt Diversification Products

2017 ◽  
Vol 862 ◽  
pp. 174-181
Author(s):  
Intan Baroroh ◽  
Bagiyo Suwasono ◽  
Ali Munazid
Keyword(s):  
Mineral Water ◽  
Solar Power ◽  
Sea Water ◽  
Coastal Communities ◽  
Combination Process ◽  
The Public ◽  
Salt Production ◽  
Liquid Salt ◽  
Disk Mill

ABSTRACT.Blue Economy concept began with the farming of Artemia salt. The industry of farmer’s salt was one of the pillars that supported the economy of coastal communities. At present, the perspectives of the public on an industrial salt production is less profitable and conducted by unskilled laborers. Nowadays, the farmer still used evaporation total method of sea water by solar power, where NaClwas ≤ 90% and residual brine. It is necessary to improve the salt production through combination between disk-mill and distillation evaporation technology to produce salt diversification product. The result of the combination process were refined salt with NaClthat was ≥ 90%, liquid salt with NaClthat was ± 60% and mineral water.

scholarly journals Efektivitas Program Pemberdayaan Usaha Garam Rakyat di Desa Losarang, Indramayu

2013 ◽  
Vol 8 (2) ◽  
pp. 144-154
Author(s):  
Santoso Budi Widiarto ◽  
Musa Hubeis ◽  
Komar Sumantadinata
Keyword(s):  
Gap Analysis ◽  
Sea Water ◽  
Selling Price ◽  
Snowball Sampling ◽  
Colonial Era ◽  
Salt Production ◽  
Self Sufficiency ◽  
Transport Workers ◽  
Business Profit ◽  
The Government

An ironic thing that Indonesia as maritime country have insufficiency salt problem. Salt is strategic commodities that can be easily produced by evaporation of sea water and policy salts have been issued since the Dutch colonial era. In 2011 the Government of Indonesia make toward self sufficiency salt policy. This research was aimed to analyze the implementation efectivity of Salt Business Empowerment Program (Pemberdayaan Usaha Garam Rakyat or PUGAR). The research design used purposive and snowball sampling to select 70 respondents in Losarang Village at Indramayu. The data were analyzed by using Quantitative Analysis, Qualitative Analysis, SWOT and MAHP. The result showed PUGAR in Losarang, Indramayu implemented with effectiveness. This is indicated by salt production target achieved and increasing the salt farmer welfare. Implementation PUGAR make salt productivity in Losarang 90,43 ton/ha, increasing salt farmer income, empower 17 the People's Business Group Salt (Kelompok Usaha Garam Rakyat or KUGAR) with the amount of 170 salt farmers, give technological innovation and quality salt production and give job for 778 peoples as salt farmers, farm workers and transport workers. Obtained result IFE of salt bussiness is 2,608 and EFE is 2,673. Moreover the research calculate salt business feasibility that known from B/C ratio > 1, business profit margin, appropriate salt area owned by farmers, business gap analysis of salt and break even analysis. Break even analysis to determine the selling price of the large volume of salt and salt production business people to reach the point of no profit and no loss (break even). Key words: Empowerment, Farmers, Government, PUGAR, Salt, Workers

scholarly journals MONITORING OF MANGROVE GROWTH AND COASTAL CHANGES ON THE NORTH COAST OF BREBES, CENTRAL JAVA, USING LANDSAT DATA

2020 ◽  
Vol 16 (2) ◽  
pp. 197
Author(s):  
Tri Muji Susantoro ◽  
Ketut Wikantika ◽  
Lissa Fajri Yayusman ◽  
Alex Tan ◽  
M. Firman Ghozali
Keyword(s):  
Coastal Area ◽  
Vegetation Index ◽  
Series Data ◽  
North Coast ◽  
Landsat Data ◽  
Coastal Change ◽  
The North ◽  
Central Java ◽  
Normalised Difference Vegetation Index ◽  
Coastal Changes

Severe abrasion occurred in the coastal area of Brebes Regency, Central Java between 1985 and 1995. Since 1997, mangroves have been planted around the location as a measure intended to prevent further abrasion. Between 1996 and 2018, monitoring has been carried out to assess coastal change in the area and the growth and development of the mangroves. This study aims to monitor mangrove growth and its impact on coastal area changes on the north coast of Brebes, Central Java Province using Landsat series data, which has previously proven suitable for wetland studies including mangrove growth and change. Monitoring of mangrove growth was analysed using the normalised difference vegetation index (NDVI) and the green normalised difference vegetation index (GNDVI) of the Landsat data, while the coastal change was analysed based on the overlaying of shoreline maps. Visual field observations of WorldView 2 images were conducted to validate the NDVI and GNDVI results. It was identified from these data that the mangroves had developed well during the monitoring period. The NDVI results showed that the total mangrove area increased between 1996 and 2018 about 9.82 km2, while the GNDVI showed an increase of 3.20 km2. Analysis of coastal changes showed that the accretion area about 9.17 km2 from 1996 to 2018, while the abrasion being dominant to the west of the Pemali River delta about 4.81 km2. It is expected that the results of this study could be used by government and local communities in taking further preventative actions and for sustainable development planning for coastal areas.

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