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Wyświetlanie 1-11 z 11
Tytuł:
Phytoremediation as a Barrier to Heavy Metal Distribution in Open Dumping Landfill in Peatlands
Autorzy:
Marsum
Anwar, Taufik
Slamet
Khayan
Wardoyo, Slamet
Powiązania:
https://bibliotekanauki.pl/articles/2105277.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
phytoremediation
barrier
heavy metal
open dumping landfill
Opis:
Landfills with the open dumping method cause many environmental pollution problems, such as pollution, soil, surface water, and groundwater. Pollution cleaning technology (remediation) to reduce the harmful effects in the locations contaminated with heavy metals can be implemented by means of several methods, including using phytoremediation as a barrier to heavy metal contamination in order to preventing contamination distribution to the environment. Ferns (phytoremediation) on the side of the open dumping landfill were investigated as phytoremediation, inhibiting the distribution of heavy metals into the environment. The descriptive-analytic research method was used to analyze the ability of ferns in an open dumping landfill in peatland areas as a barrier to metal contamination distributed to the environment. The results show that ferns can bind heavy metals, such as Hg and Pb, produced from open dumping landfill activities to prevent the distribution of heavy metals to the environment around the landfill. Ferns are able to block the distribution of heavy metals into the environment, especially Pb and Hg. The ability of ferns to become potential plants in peatland areas requires further testing of other heavy metals.
Źródło:
Journal of Ecological Engineering; 2022, 23, 6; 112--117
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecopedagogy: Biology Learning Profile of High School in Pulau Timor
Autorzy:
Lestari, Nurdiyah
Paidi
Suyanto, Slamet
Powiązania:
https://bibliotekanauki.pl/articles/18732300.pdf
Data publikacji:
2023
Wydawca:
Fundacja Pro Scientia Publica
Tematy:
Biology Learning
model ecopedagogy
contextual
local wisdom
Opis:
Aim. The purpose of this article is to increase human ecological awareness to protect, care for and preserve nature, its application in Indonesian schools is still limited. This study uses a qualitative model and aims to describe ecopedagogical models in biology learning and identify supporting factors in the implementation of the high school program. Methods. This research involved 300 grade 10 students and 20 biology teachers at Kupang High School in East Nusa Tenggara Province, Indonesia. Observations, questionnaires, interviews, and documentation were used to collect data about the implementation profile of the Ecopedagogy model. Results. The results of the study show that: expedagogical learning models must be developed by considering local cultural wisdom, teachers use textual lecture methods in carrying out environment-based learning, learning has not paid attention to local culture. society in a sustainable manner; integration of expedagogical models in media and teaching materials in Biology learning, student enthusiasm if learning is done contextually with an expedagogical approach. Conclusion. Textual learning must be changed to contextual learning. The curriculum in schools is required to be used in limited complexity by involving the local community, in order to train students' abilities to collaborate, communicate, and improve their skills. there is the development of an expedagogical learning model that pays attention to local cultural wisdom in terms of planning, implementation and evaluation of learning through intensive training activities, bearing in mind that teachers do not yet understand the steps for preparing media and teaching materials according to the curriculum.
Źródło:
Journal of Education Culture and Society; 2023, 14, 2; 494-511
2081-1640
Pojawia się w:
Journal of Education Culture and Society
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Self-Purification Ability in the Rivers of Banjarmasin, Indonesia
Autorzy:
Zubaidah, Tien
Karnaningroem, Nieke
Slamet, Agus
Powiązania:
https://bibliotekanauki.pl/articles/123456.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
self-purification
river water pollution
Banjarmasin river
Opis:
The self-purification capacity of river water is an essential indicator for a healthy river. Various organic and inorganic pollutants, both from point sources and nonpoint sources, in most streams in Banjarmasin were beyond the river self-purification capacity, which caused a decrease in the river water quality. This study attempted to identify the river water pollution distribution in the city of Banjarmasin and determined the self-purification points. We used the purposive sampling technique to carry out river water sampling, with criteria for pollutant sources and distance of pollution taken into consideration. By using the trend analysis techniques, we analyzed the parameters concentration to relate it to the range of pollution so that we were able to identify the pollution distribution and determine the self-purification distances. The results indicated that the self-purification process could take place on the river flow in of Banjarmasin even though it did not reach the clean water zone. The river in Banjarmasin requires a longer purification distance so that the self-purification process can run correctly.
Źródło:
Journal of Ecological Engineering; 2019, 20, 2; 177-182
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of Pipe Networks Using EPANET to Optimize Water Supply : a Case Study for Arjawinangun Area, Indonesia
Autorzy:
Safitri, Adam
Wahyudi, Slamet Imam
Soedarsono
Powiązania:
https://bibliotekanauki.pl/articles/31340458.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
drinking water
EPANET 2.0
hydraulic simulation
optimization
pipeline Network
Opis:
In providing clean water services to a community, a clean water supply distribution network system is very important. This study is aimed at the determination of the distribution pipe network by simulating and optimizing the water supply system in the Arjawinangun area, Cirebon, West Java, Indonesia. The data collected was analyzed by using EPANET 2.0 software for modelling water distribution systems. The results show that the total domestic and non-domestic water demand is 391.41 l/s, with a leakage rate of 20%. The pipeline installation plan for the Arjawinangun area is planned to be installed for a length of 23,045 m, with pipe diameters ranging from 400 to 90 mm. The Arjawinangun Area Offtake Reservoir drainage system, which is at an elevation of +25 m above sea level, requires a distribution pump with a head (H) of 6.0 bar. Also, using the gravity distribution technique, a water tower can be built (~ 55 m) as a water supply booster pump.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2023, 70, 1; 17-28
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Clarification of Pharmaceutical Wastewater with Moringa Oleifera: Optimization Through Response Surface Methodology
Autorzy:
Eri, I. R.
Hadi, W.
Slamet, A.
Powiązania:
https://bibliotekanauki.pl/articles/123396.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
flocculant
Moringa oleifera
response surface methodology
Opis:
Herbal pharmaceutical industrial wastewater contains a high amount of suspended solids and alkaline (pH > 8); therefore it requires approprite coagulant and flocculant compounds for its wastewater treatment. The most widely used flocculant is a synthetic that has certain problems such as non-biodegradability and releases of toxic residual monomers. The use of eco-friendly flocculants as alternative materials for conventional flocculant in water and wastewater treatments is increasing. Numerous factors influence the performance of coagulation-flocculation process, such as coagulant dosage, flocculant dosage, initial potential of hydrogen (pH) and velocity gradient of coagulation-flocculation. The main aim of this research is to evaluate the capability and effectiveness of Moringa oleifera extract for removal of suspended solid in herbal pharmaceutical industry. A coagulation-flocculation test was done by performing jar test at various speeds, according to the variation of the conducted treatment research. In this study, response surface methodology (RSM) approach was used to optimize the concentration of coagulant dosage, flocculant dosage and flocculation velocity gradient (G), and the results were measured as maximum percentage of suspended solid removal. The wastewater used in this research originally came from the inlet of herbal pharmaceutical industry wastewater treatment plant, which was collected over 3 days. The wastewater has a total suspended solids of more than 1250 mg/L, and was alkaline (pH 9–10). The moringa extract was made from the extraction of a fat free moringa powder with a salt solution in a certain ratio. The percentage removal of suspended solid was 93.42–99.54%. The final results of the analysis of response surface showed that the variables of flocculant dosage and the flocculation velocity gradient (G) have a huge impact on the amount of suspended solid removal, compared with the coagulant dosage. The model generated from the response analysis is a quadratic model. The optimum point of the removal suspended solid quadratic model is at 10.6566 mg/L alum dosage, 13.8185 ml/L Moringa oleifera extract dosage, and G velocity of flocculation 84.845 sec-1.
Źródło:
Journal of Ecological Engineering; 2018, 19, 3; 126-134
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of soil quality in organic and non-organic paddy fields with technical irrigation system in Susukan
Autorzy:
Haryuni, Haryuni
Wirawati, Hesti
Minardi, Slamet
Supriyadi, Supriyadi
Powiązania:
https://bibliotekanauki.pl/articles/2088202.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
soil quality
paddy fields
principal component analysis
minimum data set (MDS)
soil quality index (SQI)
Opis:
Soil quality is a measure of the condition of soil. The goal of sustainable agriculture is to maintain a non-negative trend in productivity while maintaining soil quality. Susukan is an area in Semarang, Central Java, Indonesia, which has developed organic farming to increase rice productivity and quality. The main objective was to determine the sustainability of organic rice cropping systems. The organic farming system at the research location has been conducted for 8 years. Appropriate agricultural management can maintain the quality of soil, environment and improve the health of plants, animals and humans. This research aims to know the soil quality and determine the minimum data set (MDS) in organic and non-organic paddy field with a technical irrigation system. Paddy soil samples were analyzed in the laboratory. The parameters are porosity, permeability, hydrogen potential (pH), cation exchange capacity (CEC), soil organic matter (SOC), total-N (nitrogen), carbon/nitrogen (C/N) ratio, available-P (phosphorus), available-K (potassium), base saturation (BS), electric conductivity (EC), soil respiration (qCO2), redox potential (Eh) with 3 repetitions. The value of soil quality index (SQI) in the organic paddy field is 3.216 with bad soil quality criteria, while the non-organic paddy field is 0.147 with very bad criteria. The soil quality values are based on the key factors or MDS that is potential redox (EH), soil respiration (qCO2), potential hydrogen (pH), porosity, soil organic matter (SOC), total-N (nitrogen), C/N ratio, available-P (phosphorus).
Źródło:
Polish Journal of Soil Science; 2020, 53, 1; 81-95
0079-2985
Pojawia się w:
Polish Journal of Soil Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Post Cast Heat Treatment on Cu20wt.%Sn on Microstructure and Mechanical Properties
Autorzy:
Slamet, S.
Suyitno, S.
Indraswari Kusumaningtyas, I. K.
Powiązania:
https://bibliotekanauki.pl/articles/2079820.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tin bronze
sand casting
heat treatment
microstructure
mechanical properties
brąz cynowy
odlewanie piaskowe
obróbka cieplna
mikrostruktura
właściwości mechaniczne
Opis:
Casting is one method of making metal components that are widely used in industry and up to date. The sand casting method is used due to its simplicity, ease of operation, and low cost. In addition, the casting method can produce cast products in various sizes and is well-suited for mass production. However, the disadvantage of casting, especially gravity casting, is that it has poor physical and mechanical properties. Tin bronze Cu20%wt.Sn is melted in a furnace, then poured at a temperature of 1100°C into a sand mold. The cast product is a rod with 400 mm in length, 10 mm in thickness, and 10 mm in width. The heat treatment mechanism is carried out by reheating the cast specimen at a temperature of 650°C, holding it for 4 hours, and then rapid cooling. The specimens were observed microstructure, density, and mechanical properties include tensile strength and bending strength. The results showed that there was a phase change from α + δ to α + β phase, an increase in density as a result of a decrease in porosity and a coarse grain to a fine grain. In addition, the tensile strength and bending strength of the Cu20wt.%Sn alloy were increased and resulted in a more ductile alloy through post-cast heat treatment.
Źródło:
Archives of Foundry Engineering; 2021, 21, 4; 87-92
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
INDIVIDUAL OR COLLABORATIVE WHATSAPP LEARNING? A FLIPPED CLASSROOM MODEL OF EFL WRITING INSTRUCTION
Autorzy:
Arifani, Yudhi
Asari, Slamet
Anwar, Khoirul
Budianto, Langgeng
Powiązania:
https://bibliotekanauki.pl/articles/955783.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej w Lublinie. IATEFL Poland Computer Special Interest Group
Tematy:
flipped instruction
collaborative writing
WhatsApp
cohesion
Opis:
Flipped classroom innovation has attracted the attention of English Language Teaching (ELT) researchers to examine its effectiveness. This inquiry, therefore, elaborates on the effect of flipping (i.e. reversing) individual and collaborative instruction using a WhatsApp application on the cohesive ability of English as a Foreign Language (EFL) learners as one of the essential elements of writing skills. A quasi-experimental study with a non-equivalent control group and a pre-test/post-test design was implemented to find any significant difference between the two combinations. The first group (N=25) was treated using 5 to 10 minutes of cohesion-based video materials and tasks from the WhatsApp group activities of the group members. Meanwhile, the second group (N=25) was treated similarly using individual WhatsApp activities. The findings reveal that the mean score from the collaborative group at 66.17 is higher than the mean score of individual ones at 50.19 with a level of significance <0.05. This means that teaching the topic of cohesion in writing using a flipped approach instruction model through the WhatsApp group turns out to be more effective than the individual one. The results suggest that teaching cohesion using a flipped approach through collaborative WhatsApp learning activities may serve as one of the suitable alternatives to improve EFL learners’ cohesion in writing.
Źródło:
Teaching English with Technology; 2020, 20, 1; 122-139
1642-1027
Pojawia się w:
Teaching English with Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of High-tin Bronze Composition on Physical, Mechanical, and Acoustic Properties of Gamelan Materials
Autorzy:
Slamet, S.
Suyitno, S.
Kusumaningtyas, I.
Miasa, I. M.
Powiązania:
https://bibliotekanauki.pl/articles/1837824.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tin bronzes
mechanical properties
acoustic properties
gamelan
sand casting
brązy cynowe
właściwości mechaniczne
właściwości akustyczne
odlewanie piaskowe
Opis:
High tin bronze alloy (Cu>17wt.%Sn) is commonly as raw material to fabricate musical instruments. Gamelan musical instruments in Indonesia are produced using tin bronze alloy raw materials. The tin bronze alloy used by each gamelan craftsman has a different tin composition, generally in the range of Cu(20-24) wt.% Sn. This study aims to investigate the effect of microstructure, density, and mechanical properties of Cu(20-24)wt.%Sn against the acoustic properties processed by the sand casting method. The material is melted in a crucible furnace until it reaches a pouring temperature of 1100ºC by the sand casting method. The specimens were subjected to microstructure observations, density and porosity as well as mechanical properties testing including tensile strength, bending strength, hardness, and modulus of elasticity. Mechanical properties data then used to calculate several parameters of acoustic properties including speed of sound (c), impedance (z) and radiation coefficient (R). Processes simulation using Finite Element Analysis (FEA) and Experiment Method Analysis (EMA) were carried out to determine acoustic properties including sound intensity, natural frequency and damping capacity. The experimental result shows that the increase in tin composition in Cu(20-24) wt.% Sn changed the microstructure of coarse grains into dendrite-columned fine grains. Physical properties of density decrease, while porosity increases. Mechanical properties including tensile strength, modulus of elasticity, and bending strength decreased, while the hardness of the alloy increases. The calculation of acoustic parameters such as the speed of sound (c), impedance (z) and radiation coefficient (R) has decreased. Moreover, sound intensity (dB), natural frequency (Hz) and damping capacity also decrease with increasing tin composition. Hence, tin bronze alloy Cu20wt.%Sn is the recommended raw material for the manufacture of gamelan instruments through the sand casting method.
Źródło:
Archives of Foundry Engineering; 2021, 21, 1; 137-145
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Immobilization of Bacillus megaterium in Carrageenan from Maluku Sea and Their Effect on Protease Production
Autorzy:
Hamdani, Syarif
Nurlatifah, Sri
Astriany, Dewi
Singgih, Marlia W.
Ibrahim, Slamet W.
Powiązania:
https://bibliotekanauki.pl/articles/1811540.pdf
Data publikacji:
2020
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
carrageenan
immobilization
protease activity
Bacillus megaterium
Opis:
Bacteria immobilized in carrageenan are widely used in industry to facilitate bacterial handling and storage. Carrageenan is derived from seaweed and its nature is influenced by the condition of the origin of the sea where seaweed grows, one of the Indonesia sea territories that has seaweed that contains caraganen with good properties is Maluku. This study was conducted to determine the effect of storage time of bacteria immobilized in Maluku sea’s carrageenan on proteolytic activity, the bacteria used were Bacillus megaterium. Bacterial immobilization of carrageenan was made at concentrations of 1%, 1.5%, and 2%, storage in cold conditions for up to 9 months. Protease activity was tested using Kunitz method by adding casein as a substrate. The optimal concentration of carrageenan for immobilization of Bacillus megaterium was obtained at a concentration of 1.5%. Protease isolated from immobilized Bacillus megaterium showed increased activity value from storage for 4 months (0.0489 Ug-1) to 7 months (0.1372 Ug-1), and decreased activity after being stored for 9 months (0.0501 Ug-1).
Źródło:
Rocznik Ochrona Środowiska; 2020, Tom 22, cz. 1; 60-69
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D Marine Cadastral System to Support Marine Spatial Planning Implementation in Indonesia: A Case Study of Penanjung Bay, Indonesia
Autorzy:
Kurniawan, Agung
Pranowo, Widodo
Hardjo, Karen Slamet
Santoso, Agus Iwan
Khakhim, Nurul
Purwanto, Taufik Hery
Setiyadi, Johar
Powiązania:
https://bibliotekanauki.pl/articles/27314301.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
marine cadastre
3D marine cadastral system
marine spatial planning (MSP)
Opis:
The ocean is a formation that has a volume and consists of a surface layer of water, a column, and a bottom. Visualization of the sea on a digital map is important to support the acceleration of marine spatial planning (MSP), which is generally two-dimensional on a flat plane. A marine cadastre is defined as an instrument used in managing spatial boundaries, which describes, visualizes, and realizes legally defined boundaries as well as rights, restrictions, and responsibilities related to activities in the marine environment. Therefore, visualization in 3D will open a wider perspective than conventional maps. The 3D marine cadastral system was built using the Penanjung Bay pilot project and the QGIS2ThreeJS plugin with JavaScript. The results obtained can provide a 3D visualization of the position and boundaries for each component of the marine cadastre in Penanjung Bay with a broader picture of the sea spatial layout in the region.
Źródło:
Geomatics and Environmental Engineering; 2023, 17, 4; 19-32
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-11 z 11

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