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Tytuł:
The effect of Morinda citrifolia L. (Noni) in drinking water on egg production and egg quality of Sentul Chickens
Autorzy:
Asmara, Indrawati Y.
Widjastuti, Tuti
Setiawan, Iwan
Abun, Abun
Powiązania:
https://bibliotekanauki.pl/articles/1046529.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Morinda citrifolia
Sentul chickens
egg production
egg quality
Opis:
Morinda citrifolia (Noni) is a common plant used as alternative to synthetic feed additive in poultry production. The study was aimed to determine the effect of Noni juice in drinking water on production and egg quality of Sentul Chickens. Sentul Chicken is an indigenous chicken of Indonesia that has dual purpose potential. A total of 20 birds of female Grey Sentul Chickens aged 22 weeks were reared for eight weeks. The observed variables were hen day production, yolk and albumen indexes, as well as cholesterol content of yolk egg. The results showed that addition of Noni fruit juice to drinking water significantly increased egg production and reduced the yolk index. Moreover, the treatments reduced the cholesterol of yolk of Sentul Chickens. The study reveals that increasing levels of Noni fruit juice in drinking water also had positive effects on egg production and egg quality. Further studies are, however, needed to have better understanding about the use of Noni fruit in enhancing egg production and egg quality of Sentul chickens.
Źródło:
World Scientific News; 2019, 136; 122-133
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of work satisfaction on employee engagement
Wpływ satysfakcji z pracy na zaangażowanie pracowników
Autorzy:
Djoemadi, Faizal R.
Setiawan, Margono
Noermijati, Noermijati
Irawanto, Dodi W.
Powiązania:
https://bibliotekanauki.pl/articles/405113.pdf
Data publikacji:
2019
Wydawca:
Politechnika Częstochowska
Tematy:
employee engagement
work satisfaction
telecommunication
zaangażowanie pracowników
zadowolenie z pracy
telekomunikacja
Opis:
The study aims at examining the effect of work satisfaction on employee engagement. The study was conducted using the quantitative method. The population consists of the employees of telecommunication network providers in the industry. The numbers of employees eligible to be included in the population were 14,000 people (2015), which came from various managerial levels. Upon restricting the population three managerial levels, including senior leaders, line managers, and supervisors, the number went down to 8,064 people. For the study, samples of 100 respondents were chosen using multistage-random sampling. The data were processed using the Structural Equation Modeling (SEM) method. The results of the study showed that in telecommunication network providers, work satisfaction could increase employee engagement. Work condition was the dominant driver in increasing employee engagement, followed by work relationship and promotion. Work conditions include work security, work comfort, stress levels, working hours, and management policies. These aspects could provide the highest support in shaping employee engagement. The results of this study provide an implication for telecommunication network providers in Indonesia, which is that employee engagement was mainly driven by employee satisfaction with their work condition, work relationship, and promotion.
Badanie ma na celu analizę wpływu satysfakcji z pracy na zaangażowanie pracowników. Badanie przeprowadzono metodą ilościową. Próbka składa się z pracowników dostawców sieci telekomunikacyjnych. Liczba pracowników kwalifikujących się do włączenia do populacji wynosiła 14 000 osób (2015 r.), które pochodziły z różnych poziomów kierowniczych. Po ograniczeniu populacji do trzech poziomów kierowniczych, w tym wyższych rangą liderów, menedżerów liniowych i nadzorców, liczba ta spadła do 8 064 osób. Do badania wybrano próbki 100 respondentów przy użyciu wielostopniowego losowego pobierania próbek. Dane zostały przetworzone przy użyciu metody Modelowania Równań Strukturalnych (SEM). Wyniki badania wykazały, że w przypadku dostawców telekomunikacyjnych zadowolenie z pracy może zwiększyć zaangażowanie pracowników. Stan pracy był dominującym czynnikiem zwiększającym zaangażowanie pracowników, a następnie stosunki pracy i awans. Warunki pracy obejmują bezpieczeństwo pracy, komfort pracy, poziom stresu, godziny pracy i zasady zarządzania. Te aspekty mogą zapewnić najwyższe wsparcie w kształtowaniu zaangażowania pracowników. Wyniki tego badania dostarczają implikacji dla dostawców sieci telekomunikacyjnych w Indonezji, a mianowicie, że zaangażowanie pracowników było głównie spowodowane satysfakcją pracowników z ich warunków pracy, stosunków pracy i promocji.
Źródło:
Polish Journal of Management Studies; 2019, 19, 2; 101-111
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioactive Compounds Evaluation of the Mudskippers in the Estuarine Area of Musi River, South Sumatera, Indonesia
Autorzy:
Ridho, Mohammad Rasyid
Setiawan, Arum
Sarno, -
Arwinsyah, -
Patriono, Enggar
Sulistiono, -
Powiązania:
https://bibliotekanauki.pl/articles/952343.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
mudskipper
Musi river
bioactive compounds
Opis:
This research was conducted to assess various bioactive compounds in the meat of mudskippers found in the Sungsang 2 Village, Banyuasin regency, South Sumatra. The research had been synthesized using n-hexane from February to May 2018 at Agricultural Technology Production Laboratory, Sriwijaya University. Subsequently, the mudskippers (Periopthalmus chrysospilos, Boleopthalmus boddarti, and Periophthalmodon schlosseri) extract was synthesized and further investigate by conducting the GC-MS analysis. The study of bioactive compounds in mudskippers was carried out by evaporating in vacuum evaporation at 30°C. The results showed that Periopthalmus chrysospilos has five classes of bioactive compounds such as steroids, terpenoids, carotenoids, canabinoids, and alkaloids and Boleopthalmus boddarti has five classes of bioactive compounds including steroids, carotenoids, terpenoids, bufadienolides, and carotatoxins. Furthermore, Boleopthalmus dussumieri has four classes of bioactive compounds such as steroids, carotenoids, terpenoids, and carotatoxins and Periophthalmodon schlosseri has three classes of bioactive compounds including steroids, carotenoids and terpenoids. This research discussed the potential benefit of all bioactive compounds in mudskippers for alleviating and treating children with enuresis through the review of literature on the most cited bioactive compounds.
Źródło:
Journal of Ecological Engineering; 2020, 21, 3; 70-80
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of Lecturer Satisfaction
Autorzy:
Aprillia, Ariesya
Setiawan, Rony
Magdalena, Nonie
Powiązania:
https://bibliotekanauki.pl/articles/1963532.pdf
Data publikacji:
2020-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
importance performance analysis
lecturer satisfaction
Opis:
The aim of this research is to analyze the extent of lecturers’ satisfaction with regard to the gap between the satisfaction experienced and what is expected. The sample in this study were lecturers at one of a Private Higher Education institution in Bandung, Indonesia. Sampling was done using simple random sampling techniques. This study uses the Focus Group Discussion method. The instrument test uses validity and reliability tests, and the data analysis used in this study is Importance and Performance Analysis. Referring to the results of data processing, it was found that there were 4 out of 27 indicators in Quadrant I where the lecturer felt that the existence of indicators was considered very important, while the level of performance was still not satisfactory. Indicators that are considered not yet optimum are the provision of communication channels between leaders and lecturers, daycare facilities, clean eating places/ food courts, and resources for research that is not yet optimum. The outcomes of this research are considered to give positive feedback and positive feed forward to the Private Higher Education regarding service programs oriented to employees.
Źródło:
The New Educational Review; 2020, 60; 178-190
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatio-temporal variation of karst spring parameters for characterizing of the aquifer system of Watuputih Area, Indonesia
Autorzy:
Setiawan, Taat
Syah Alam, Boy Y.C.S.S.
Haryono, Eko
Hendarmawan, Hendarmawan
Powiązania:
https://bibliotekanauki.pl/articles/946921.pdf
Data publikacji:
2020
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
flow system
hydrochemical properties
Indonesia
karst aquifers
spring variability
Opis:
There are several springs with the large discharge around the Watuputih Karst Hills area that playing a crucial role in supplying water for both domestic and irrigation needs. The springs are located in the fault and fold zones of the Rembang anticlinorium system. This study was designed to determine the characteristics of karst aquifers from one year of monthly spatio-temporal data on discharge parameters and physico-chemical properties (temperature, pH, EC, Ca2+, Mg2+, HCO3–) of the four major springs, namely Brubulan Tahunan, Sumbersemen, Brubulan Pesucen, and Sendang Sayuran. It used statistical calculations to characterize spring discharge and hydrochemical variations, as well as bivariate correlation analysis and flow-duration curve (FDC). The variability index (Iv), variability (V), and spring coefficient of variation parameters (SCVP) classified Brubulan Tahunan and Sumbersemen as springs producing stable, fairly constant discharge with low variations but characterized Brubulan Pesucen as having unstable, varying discharge with moderate variations. The results showed gently sloping hydrograph, low variations in discharge and hydrochemical properties, a relatively prolonged response of discharge and CO2-H2O-CaCO3 interaction to rainfall, and slope changes in the FDC. In other terms, although the springs are controlled by faults and folds, they have diffuse groundwater storage system in the form of densely fractured and porous media. These findings also indicate a less developed interconnected conduit, although Brubulan Pesucen is relatively more developed than Sumbersemen and Brubulan Tahunan. The geological structure and hydraulic gradient formed between the groundwater recharge and discharge areas are proven to control the amount of spring discharge actively.
Źródło:
Journal of Water and Land Development; 2020, 45; 143-156
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determinants and relations of competition and performance in cable manufacturing industry
Uwarunkowania i zależności konkurencji i wyników w przemyśle produkcji kabli
Autorzy:
Setiawan, Adam Putranto
Primiana, Ina
Sule, Ernie Tisnawati
Kaltum, Umi
Powiązania:
https://bibliotekanauki.pl/articles/2021094.pdf
Data publikacji:
2021
Wydawca:
Politechnika Częstochowska
Tematy:
competitive strategy
business performance
government regulation
industry competition
supply chain integration
cable industry
PLS
strategia konkurencji
wyniki biznesowe
regulacje rządowe
konkurencja branżowa
integracja łańcucha dostaw
przemysł kablowy
Opis:
The objective of this paper is to empirically test the impact of government regulation, industry competition, and supply chain integration on cable manufacturers’ competitive strategy and how these factors affect manufacturers’ performance. There has not been much focus given by previous studies on cable manufacturers’ competition strategy, especially in emerging economies. Therefore, there is a lack of consensus regarding the determinants of cable manufacturers’ competitive strategy and its impact on business performance. Filling this gap and providing recommendations for both cable manufacturing and regulators to improve the cable manufacturing industry’s performance, the present study has been executed, and this proposed research also provides the novelties to this paper. Partial least square estimation was used with data from 31 cable manufacturers in Indonesia. The estimation result shows that cable manufacturers’ competitive strategy is significantly affected by industry competition and supply chain integration, while the government regulation variable is not significant. Regarding business performance, industry competition has the largest total effect, followed by supply chain integration, competitive strategy, and government regulation, respectively.
Celem tego artykułu jest empiryczne przetestowanie wpływu regulacji rządowych, konkurencji branżowej i integracji łańcucha dostaw na strategię konkurencyjną producentów kabli oraz wpływu tych czynników na wyniki producentów. W poprzednich badaniach nie poświęcono zbyt wiele uwagi strategii konkurencji producentów kabli, zwłaszcza w gospodarkach wschodzących. Dlatego nie ma zgody co do determinantów strategii konkurencyjnej producentów kabli i jej wpływu na wyniki biznesowe. Wypełniając tę lukę i przedstawiając zalecenia zarówno dla producentów kabli, jak i dla organów regulacyjnych w celu poprawy wydajności przemysłu produkcji kabli, przeprowadzono niniejsze badanie, a proponowane badanie dostarcza również nowości do tego artykułu. Zastosowano częściowe oszacowanie metodą najmniejszych kwadratów z danymi od 31 producentów kabli w Indonezji. Wynik oszacowania pokazuje, że konkurencja w branży i integracja łańcucha dostaw znacząco wpływają na strategię konkurencyjną producentów kabli, podczas gdy zmienna regulacyjna rządu nie jest znacząca. Jeśli chodzi o wyniki biznesowe, największy łączny wpływ ma konkurencja w branży, a następnie odpowiednio integracja łańcucha dostaw, strategia konkurencji i regulacje rządowe.
Źródło:
Polish Journal of Management Studies; 2021, 23, 1; 341-351
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of Chlorophyll-a Phytoplankton in the Coastal Waters of Semarang and Jepara for Monitoring the Eutrophication Process using MODIS-Aqua Imagery and Conventional Methods
Autorzy:
Maslukah, Lilik
Setiawan, Riza Yuliratno
Nurdin, Nurjannah
Zainuri, Muhammad
Wirastriya, Anindya
Helmi, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/1839558.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
chlorophyll a
eutrophic
spectrometry
satellite
MODIS-Aqua
Opis:
This study investigates the concentration of chlorophyll-a (chl-a) using the data of field observation and MODISAqua imagery. The field observation data were retrieved by using a conventional method and processed using spectrometric analysis. This study covers the coastal and near land areas which have different levels of anthropogenic activity. The results showed that the coastal waters of Semarang with a high level of anthropogenic activity persistently show a concentration of chlorophyll a (chl-a) twice as large as Jepara coastal waters. This comparison value is obtained based on imagery and field data. Meanwhile, the ratio of chl-a field data in each region shows a value of ±5 times greater than the MODIS data. Field observation data shows a higher value than the MODISAqua imagery data. The use of imagery data can be employed as a method of monitoring the eutrophication process on the coast. On the basis of the chlorophyll a classification and field observations, the coastal water of Semarang are classified as eutropic waters and Jepara is categorized as mesotropic category. The classification results will be different if monitoring is carried out using the image data with a location far from the mainland, the Semarang waters are included in the mesotropic category (> 2 mg•m-3) and Jepara is included in the oligotropic water category (< 2 mg•m-3).
Źródło:
Journal of Ecological Engineering; 2021, 22, 1; 51-59
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of Gamboeng Tea Product Manufacturing Process and Their Role in Reducing Environmental Impact
Autorzy:
Bardant, Teuku B.
Setiawan, Arief A. R.
Haq, Miathia S.
Prasetia, Hafiizh
Mastur, Adhi I.
Harianto, Sugeng
Putra, Augusta S.
Sulaswatty, Anny
Wiloso, Edi I.
Noguchi, Ryozo
Powiązania:
https://bibliotekanauki.pl/articles/1841412.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CO2 emission
dried tea
powdered tea
boxed tea
consuming habits
Opis:
This study offers an overview of how changing habits in consuming a cup of tea can contribute to make better environment. As the initial existing scenario, survey for picturing Indonesian consumers in preparing their cup of tea from dried leaves was conducted to urban and suburban citizens. According to the survey, both respondent groups were using LPG as the first choice in boiling water for preparing tea, followed by using an electric dispenser as the second choice. This habit causes CO2 emission from processing a cup of tea by Indonesian consumer was 24 g CO2-eq per cup of tea, excluding the tea organic waste. The portion of CO2 emission from boiling water in tea preparation was 41.93% of whole CO2 emission from plantation to served cup. The emission can be significantly reduced by converting dried tea (initial scenario) into the ready-to-drink product, in the form of powdered tea (second scenario) and boxed tea (third scenario). This study simulated an integrated system of tea product manufacturing system with biogas utilization produced from tea organic waste. Simulation conducted based on daily manufacturing process at the Gamboeng green tea factory. Additional required energies were simulated from the wood pellet, which is the best practice in the Gamboeng Tea factory. By shifting tea consuming habit from dried tea to powdered tea and/or boxed tea, the emission from a cup of tea can be reduced, with range of reduction varied from 8.87 g to 22.13 g CO2-eq per cup of tea. If the Gamboeng green tea daily production capacity of the factory is fully converted into powdered tea, the potency of CO2 emission reduction reaches 26.92 metric ton CO2. However, the factory should pay attention to providing the water for the manufacturing process. The required water was 45.23 m3 of drinking water if all dried tea converted to powdered tea. Moreover, 11.53 m3 of water is required as irrigation for the biogas process in converting all tea organic waste into biogas.
Źródło:
Management and Production Engineering Review; 2021, 12, 2; 86-97
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Biological, Chemical, and Physical Parameters to Evaluate the Effect of Floating Solar PV in Mahoni Lake, Depok, Indonesia: Mesocosm Experiment Study
Autorzy:
Andini, Syarfina
Suwartha, Nyoman
Setiawan, Eko Adhi
Ma'arif, Samsul
Powiązania:
https://bibliotekanauki.pl/articles/2086384.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
floating solar PV
mesocosm
natural water
ecosystem
Opis:
Waters provide essential needs both for human societies as well as natural ecosystems. Floating solar PV (FPV) applications on water bodies are currently in strong demand worldwide. Floating solar PV system is a new concept in renewable energy with the solar plants by harnessing available water surface, such in dams, lakes, and other water bodies. Although the floating solar PV industry is becoming more and more popular, the study on the biological, chemical, and physical properties effects of using FPV cover on natural water coverage – especially in tropical countries – has not been widely carried out yet. This paper aimed to evaluate the effect of floating solar PV on temperature, DO (dissolved oxygen), TDS (total dissolved solids), total phosphorus concentration, and chlorophyll-a concentration using mesocosm experiments to understand the biological, chemical, and physical process under closed environment. The experiment was conducted in a natural water body, Mahoni Lake, in which a total amount of 7 water samples were collected from each mesocosms. The results show that the floating solar PV reduces the average temperature, DO, conductivity, TDS, and chlorophyll-a concentration changes (p-value < 0.05); and the floating solar PV does not directly reduce the average total phosphorus concentration due to high probability of thermal stratification (p-value > 0.05).
Źródło:
Journal of Ecological Engineering; 2022, 23, 4; 201--207
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biodiesel Production from Crude Palm Oil Using Kapok Skin KOH (Ceiba Pentandra) Catalyst as Solid Green Catalyst
Autorzy:
Jalaluddin
Ginting, Zainuddin
Maliki, Syariful
Setiawan, Arif
Zulfa
Powiązania:
https://bibliotekanauki.pl/articles/2086431.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
biodiesel
crude palm oil
high purity
Ceiba Pentandra
THF
tetrahydrofuran
Opis:
Biodiesel is one type of renewable alternative energy that has great potential to be developed. Biodiesel is a fuel consisting of a mixture of mono-alkyl esters of long-chain fatty acids made from renewable sources, such as vegetable oils or animal fats, one of which is crude palm oil (CPO). Crude palm oil contains free fatty acids in high levels, so treatment is needed to reduce free fatty acids by a reaction known as the esterification reaction. Then, the transesterification process is carried out to produce biodiesel (methyl ester). The purpose of this study was to analyze the effect of catalyst mass, a mole ratio of CPO to moles of methanol and the effect of adding THF co-solvent to biodiesel purity. The catalyst used is a heterogeneous catalyst from kapok fruit peel waste. Kapok fruit rind was calcined at 700°C for 8 hours. The independent variable varied the mole ratio of oil to methanol in a 1:4 ratio; 1:6; 1:8; and 1:10 with a catalyst weight variation of 3 and 4%. Meanwhile, for the addition of co-solvent, variations of THF: methanol v/v 1:1 and 2:1, were carried out. The biodiesel properties such as density, viscosity, water content and acid number, were evaluated and compared with the Indonesian National Standard. The results showed that the transesterification reaction with the addition of co-solvent resulted in a higher methyl ester content than that without the addition of co-solvent. The highest yield of methyl ester without the addition of co-solvent was 79.16%, while the yield of the methyl ester with the addition of THF co-solvent with a ratio of 1:1 and 2:1 v/v to methanol was 90.09 and 94.09%, respectively. The highest methyl ester content (94.09%) was achieved by the addition of THF: methanol = 2:1, CPO: methanol molar ratio = 1:6 and 4 wt% catalyst weight. The results obtained in this study indicate that a green catalyst made from kapok skin can be used to produce biodiesel and also the addition of co-solvent can increase the yield of methyl esters, so that high purity is obtained.
Źródło:
Journal of Ecological Engineering; 2022, 23, 5; 286--292
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of different intensities aerobic exercise to cardiac angiogenesis regulation on Wistar rats
Autorzy:
Sylviana, N.
Goenawan, H.
Susanti, Y.
Lesmana, R.
Megantara, I.
Setiawan
Powiązania:
https://bibliotekanauki.pl/articles/16539096.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
angiogenesis
exercise
CD34+
HIF-1α
myocardium
PGC-1α
VEGF
Opis:
The adaptation response of myocardium angiogenesis stimulated by specific exercise intensities remains unclear. The aims of this study is to explore the effect of different intensities aerobic exercise to cardiac angiogenesis regulation via HIF-1α, PGC-1α, VEGF, and CD34+ in Wistar rats. Wistar rats were divided into control and exercise groups. Exercise groups were trained on a treadmill for 12 weeks, 30 min/day for 5 days with low, moderate, and high-intensity groups. The rats were sacrificed, and the myocardium was collected and preserved at -80°C until used. Cardiac protein samples were extracted and run for Western blotting using the specific antibodies: hypoxia-inducible factor (HIF)-1α, Peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α), vascular endothelial growth factor (VEGF), and Cluster of differentiation 34 (CD34+). Results showed that protein expression of HIF-1α, PGC-1α, VEGF, and CD34+ was increased significantly by different intensities in the exercise group compared to the control. A correlation statistics test showed that there was a strong correlation effect of HIF-1α on VEGF protein expression in low (p=0.047) and high intensity exercise groups (p=0.009), but no effect was found in the moderate groups. In addition, there was a significant strong effect of PGC-1α on VEGF protein expression in the moderate groups (p=0.037), but no effect was found in other groups. In conclusion, different exercise intensities induce a different modulation pattern of proteins which might be responsible for cardiac adaptation, especially angiogenesis.
Źródło:
Polish Journal of Veterinary Sciences; 2022, 25, 1; 119-128
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Investigation and Simulation of Slow Pyrolysis Process of Arabica Coffee Agroindustry Residues in a Pilot-Scale Reactor
Autorzy:
Setiawan, Adi
Zakarya, Muhammad
Alchalil
Nur, Taufiq Bin
Powiązania:
https://bibliotekanauki.pl/articles/2173337.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
slow pyrolysis
pyrolytic oil
biochar
aspen plus
coffee agro-industry residue
Opis:
Coffee pulp and husk are the primary residues of the coffee agro-industry. Disposing of them into the land can bring a serious problem on the environment. Strategies are needed to convert it into more valuable products as well as reduce the risk of environmental damage. This paper reports experimental and simulation investigation on the pyrolysis of Gayo arabica coffee pulp and husk in a pilot scale reactor. The investigation included finding the chemical and physical properties of biomass under ultimate, proximate, bomb calorimeter and TGA analyses. During the pyrolysis experiments, 3 kg of dried raw material was fed into the reactor and heated from room temperature to 600 °C, then held for 2.5 h. Afterwards, the resulting biochar and pyrolytic oil ware quantified for product distribution analysis. Modeling and simulation of the pyrolysis process were performed using Aspen Plus V10 software. Experimental results show that biochar is the main product giving a yield of 43.83%. The percentage of pyrolytic oil and un-condensable gas products are 25.5% and 30.67%, respectively. The thermodynamic simulation shows a good agreement with the experimental result, which helps in optimization and scaling up reactor.
Źródło:
Journal of Ecological Engineering; 2022, 23, 8; 260--269
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-medical risk assessment of COVID-19 in parts of Central and East Java, Indonesia
Autorzy:
Saputra, Aditya
Setiawan, Wisnu
Arif, Muhammad
Sriyono, Sriyono
Nurmalasari, Intan Rohmah
Dijaya, Rohman
Ulinuha, Agus
Powiązania:
https://bibliotekanauki.pl/articles/2054584.pdf
Data publikacji:
2022-03-31
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
COVID-19 pandemic
Central and East Java Indonesia
non-medical risk
analytical hierarchy process
Opis:
The impact of the Coronavirus disease 2019 (COVID-19) pandemic varies as each country has a different capacity to stop the virus transmission and apply social distancing. A densely populated country, such as Indonesia, tends to face challenges in implementing social distancing due to population characteristics. The Indonesian government focuses on the medical aspect as this virus is new and has been deadly with a high transmission rate. Meanwhile, the non-medical risk during the pandemic is still unclear. The main objective of this study is to assess the non-medical risk at the village level in two agglomeration cities of Central Java: Greater Surakarta and Surabaya. The methodologies use a risk index, derived from the risk reduction concept. The hazard refers to the death toll, while the vulnerability relates to parameters such as disaster, social and public facilities, health facilities, economics and demography. Further, the parameters were weighted based on expert judgement derived using analytical hierarchy process (AHP). The study found that the disaster aspect had the highest weight (0.38), followed by health facilities (0.31), economics (0.17), social-public facilities (0.11) and demography (0.04). The standard deviations of those parameters were relatively low, between 0.12 and 0.25. A low vulnerability index (0.05–0.36) was observed to be dominant in both study areas. There are 11 villages in Greater Surakarta and 30 villages in Greater Surabaya with high vulnerability index. Disaster-prone areas, low economic growth, lack of health facilities and aged demographic structure significantly added to this vulnerability. Further, a high-risk index (0.67–1.00) is observed in three villages in Greater Surabaya and one village in Greater Surakarta. These villages are relatively close to the city centre and have good accessibility. Furthermore, these four villages experienced the severest impact of the pandemic because the furniture and tourism sectors were their primary industries.
Źródło:
Quaestiones Geographicae; 2022, 41, 1; 147-169
0137-477X
2081-6383
Pojawia się w:
Quaestiones Geographicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical Characteristics of Aceh Traditional Salt and Its Potential as Raw Material for Thermal Energy Storage
Autorzy:
Gunawati, -
Humaidi, Syahrul
Setiawan, Adi
Sirait, Makmur
Jalil, Zulkarnain
Ramadhani, Nadilla
Makruf, Amar
Riskina, Shafira
Irhamni, -
Powiązania:
https://bibliotekanauki.pl/articles/2026731.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
aceh salt
enthalpy
thermal conductivity
thermal energy storage
Opis:
Thermal energy storage is an important element in order to conserve the energy and optimize the overall efficiency. Development of energy storage system for local purposes requires some information on the raw material which is abundantly available in the local market. This study aimed to investigate the characteristics of traditionally produced salt in Aceh in terms of its potential use as a raw material for thermal energy storage. The sample was collected from the Aceh Besar District and treated by heating at temperatures of 400 °C and 800 °C in a muffle furnace. This treatment is carried out to study the changes in properties and define the best procedure for salt preparation. All samples were characterized under a number of techniques including XRF, XRD, SEM/EDS, TGA/DSC analysis, density, thermal conductivity, and electrolytic conductivity. The XRF characterization showed that the local Aceh salt was graded as a category III salt. Furthermore, according to the TGA/DSC characterization, the melting temperature is close to 800 °C, and the enthalpy value is close to 492 kJ/kg. It is ample evidence that the Aceh salt can be used as a thermal energy storage material. Furthermore, increasing the temperature of local salt’s heat treatment contributes to increasing the enthalpy value, crystal size, density, thermal conductivity, and electrolyte conductivity.
Źródło:
Journal of Ecological Engineering; 2022, 23, 2; 116-122
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy Metals Contamination of Local and Imported Rice in Semarang, Central Java, Indonesia
Autorzy:
Wahyuningsih, Nur Endah
Setiawan, Henry
Nabiha, Puteri Inandin
Kartasurya, Martha Irene
Azam, Mahalul
Powiązania:
https://bibliotekanauki.pl/articles/27323834.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
pH
heavy metals
rice
local
import
Opis:
This study defined the heavy metal concentration in rice, a commonly consumed staple food in Indonesia that is domestically produced and also imported from other countries due to its high demand. A total of six rice samples, comprising of four domestic and two foreign were randomly taken from Semarang stores and analyzed using the Atomic Absorbance Spectrometer (AAS). The laboratory results revealed that three varieties of rice, two from Indonesia (MW and PW; 0.561 and 0.456 mg/kg, each), and one from the United States (B; 0.307 mg/kg), exceeded the Indonesian dietary standard for lead (Pb) (SNI). Furthermore, the concentration of chromium (Cr) in two rice that are imported (B, 0.241 mg/kg and J, 0.723 mg/kg) were greater than the 0.2 mg/kg threshold established by the Chinese government. However, all samples had acceptable levels of As and Hg, and none had detectable levels of Cd. In terms of pH levels, domestically produced rice had a wider range (3.88–5.78) compared to imported rice (4.96–5.68). Although locally grown and imported rice had acceptable levels of LCR, only one local rice sample and two imported rice samples exceeded the Target Hazard Quotient (THQ) as well as Hazard Index (HI) values. In conclusion, consuming heavy metals contamination rice on a regular basis poses carcinogenic as well as non-carcinogenic health risks.
Źródło:
Journal of Ecological Engineering; 2023, 24, 7; 49--60
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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