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Experimental Investigation of Organic Rankine Cycle (ORC) for Low Temperature Geothermal Fluid: Effect of Pump Rotation and R-134 Working Fluid in Scroll-Expander

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Energy Engineering 2021年第5期118卷 1565-1576页

作者： nugroho agung Pambudi Santiko Wibowo Ranto Lip Huat Saw Energy and Society Laboratory Mechanical Engineering EducationUniversitas Sebelas MaretSurakarta57126Indonesia Lee Kong Chian Faculty of Engineering and Science UTARKajang43000Malaysia

Organic Rankine Cycle(ORC)is one of the solutions to utilize a low temperature geothermal fluid for power *** ORC system can be placed at the exit of the separator to extract energy from ***,one of the main components of the system and very important is the ***,in this research,the pump rotation is examined to investigate the effect on power output and energy efficiency for low temperature geothermal *** rotation is determined by using an inverter with the following frequencies:7.5,10,12.5,15 and 17.5 Hz,respectively.R-134 working fluid is employed with 373.15 K evaporator temperature in relation to the low temperature of the geothermal ***,the condenser temperature and fluid pressure were set up to 293.15 K and 5×10^(5) Pa,*** research uses a DC generator with a maximum power of 750 Watt and the piping system is made from copper alloy C12200 ASTM B280 with size 1.905×10^(−2) m and a thickness of 8×10^(−4) *** results showed that there is an increase in mass flow rate,enthalpy and generator power output along with increasing pump *** addition,it showed that the maximum generator output power was 377.31 Watt at the highest pump rotation with a frequency of 17.5 Hz.

关键词： Organic Rankine Cycle(ORC) geothermal energy pump R-134a energy efficiency

Identification and quantification of flavonoids in Carica papaya leaf and peroxynitrite-scavenging activity

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Asian Pacific Journal of Tropical Biomedicine 2017年第3期7卷 208-213页

作者： agung nugroho Hesty Heryani Jae Sue Choi Hee-Juhn Park Department of Agro-industrial Technology Faculty of AgricultureLambung Mangkurat UniversityBanjarbaru70714Indonesia Department of Food Science and Nutrition Pukyong National UniversityBusan607-737Republic of Korea Department of Pharmaceutical Engineering Sangji UniversityWonju220-702Republic of Korea

Objective: To characterize the types, contents, and peroxynitrite-scavenging activities of flavonoids in the leaf of Carica papaya(C. papaya).Methods: Chromatographic and spectroscopic techniques along with high performance liquid chromatography quantitative analysis and peroxynitrite-scavenging assay were performed to isolate and quantify flavonoid compounds in the flavonoid-rich fraction(Bu OH fraction) derived from Me OH extract of C. papaya leaves and evaluate their peroxynitrite-scavenging ***: Seven flavonoids were isolated from the leaves of C. papaya, including quercetin 3-(2~G-rhamnosylrutinoside), kaempferol 3-(2~G-rhamnosylrutinoside), quercetin 3-rutinoside, myricetin 3-rhamnoside, kaempferol 3-rutinoside, quercetin, and kaempferol. All of the substances exhibited potent activities on peroxynitrite scavenging(IC50 4.15 mmol/L), which were stronger than the positive control, L-penicillamine(6.90 mmol/L). The content of kaempferol 3-(2~G-rhamnosylrutinoside) was significantly higher than other identified compounds(123.18 mg/g Bu OH fraction and 7.23 mg/g Me OH extract).Conclusions: The results of the present study demonstrate the potent antioxidant flavonoids of C. papaya leaf, with kaempferol 3-(2~G-rhamnosylrutinoside) as the major one.

关键词： Carica papaya Caricaceae Flavonoid HPLC quantification Peroxynitrite Kaempferol 3-(2~Grhamnosylrutinoside)

Upgrading the Quality of Solid Fuel Made from Nyamplung (Calophyllum inophyllum) Wastes Using Hydrothermal Carbonization Treatment

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Energy Engineering 2021年第1期118卷 189-197页

作者： Riina Syivarulli nugroho agung Pambudi Mochamad Syamsiro Lip Huat Saw Graduate Program of Vocational Teacher Education Sebelas Maret UniversitySurakarta57126Indonesia Department of Mechanical Engineering Education Sebelas Maret UniversitySurakarta57126Indonesia Department of Mechanical Engineering Janabadra UniversityYogyakarta55231Indonesia Lee Kong Chian Faculty of Engineering and Science UTARKajang43000Malaysia

One of the major problems faced in managing biomass waste to higher quality products is choosing the right *** are used as an alternative fuel,with increase in the calorific *** carbonization(HTC)is a biomass conversion technology,used to obtain solid *** study aims to utilize of Calophyllum inophyllum as an alternative solid fuel through *** calorific value and proximate of the hydrochar will be determined and analyzed to find out its *** experiments were carried out at temperature variations of 160℃,190℃,and 220℃ and holding times of 30 and 60 *** results show that an increase in temperature and holding time causes a decline in the moisture content 1.87%,volatile matter 54.03%,and ash content 12.35%,respectively,leading to elevations in the fixed carbon at 31.75%.In addition,the highest calorific value of 4149 Kcal/Kg was produced at a temperature of 220℃,within a holding time of 60 *** results showed a significant increase in the quality of solid fuels between 3500–4611 Kcal/Kg in accordance with the American Standard Testing and Materials(ASTM).Therefore,this research leads to an important finding that Calophyllum inophyllum waste through the HTC process can be used as an alternative fuel to substitute lignite coal,which is environmentally friendly.

关键词： Hydrothermal carbonization solid fuel Calophyllum inophyllum Nyamplung

Anti-acetylcholinesterase activity of the aglycones of phenolic glycosides isolated from Leonurus japonicus

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Asian Pacific Journal of Tropical Biomedicine 2017年第10期7卷 849-854页

作者： agung nugroho Jae Sue Choi Joon-Pyo Hong Hee-Juhn Park Department of Agro-industrial Technology Faculty of AgricultureLambung Mangkurat UniversityBanjarbaru 70714 Indonesia Department of Food Science and Nutrition Pukyong National UniversityBusan 48513Republic of Korea Department of Pharmaceutical Engineering Sangji UniversityWonju 26339Republic of Korea

Objective: To find the genuine structure with anti-acetylcholinesterase(anti-ACh E) from the phenolic glycosides abundant in Leonurus japonicus(Lamiaceae). The assay for antiACh E activity is often used to lead anti-Alzheimer's ***: The five phenolic glycosides, tiliroside, leonurusoside C, 2’’’-syringoylrutin,rutin, and lavanduliofolioside were isolated from L. japonicus. The activities of the glycosides were relatively low. Seven compounds including p-coumaric acid, caffeic acid, hydroxytyrosol, salidroside, syringic acid, kaempferol, and quercetin, which are produced by the hydrolysis of the five glycosides, were also assayed for anti-ACh E ***: Of those seven compounds, the five compounds other than salidroside and syringic acid exhibited potent anti-ACh E activities. In particular, the IC_(50)s of caffeic acid and quercetin were(1.05 ± 0.19) and(3.58 ± 0.02) mg/m L, respectively. Rutin was the most abundant flavonoid in the extract(9.18 mg/g as measured by HPLC).Conclusion: The substances with potent anti-ACh E were caffeic acid, quercetin, pcoumaric acid, kaempferol, and hydroxytyrosol that can be produced from their glycosides.

关键词： Leonurus japonicus Lamiaceae Acetylcholinesterase Phenolic glycosides Quercetin Caffeic acid

Prospects and Challenges of Utilizing Solar Energy for the COVID-19 Vaccine Cold Storage in Remote Clinics of Tropical Countries:Review

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Energy Engineering 2022年第4期119卷 1403-1418页

作者： Indra Mamad Gandidi Apri Wiyono nugroho agung Pambudi Rahmat Romadhon Alfan Sarifudin Department of Mechanical Engineering Education Universitas Pendidikan IndonesiaBandung40154Indonesia Department of Mechanical Engineering Education Universitas Sebelas MaretSurakarta57126Indonesia Department of Mechanical Engineering Institute Teknologi BandungBandung40116Indonesia

The rapid spread of COVID-19 pandemic has forced several countries in the world to store vaccines in cold storage towards ensuring their protection from being damaged and to maintain their ***,most remote clinics,especially those in the equator and islands,are faced with the challenges of hot climates and the inability to afford electricity resources needed to power the cold storage ***,the hot equatorial region has abundant solar energy to power the vaccine cold storage but previous studies showed that several field workers do not have the ability to maintain the vaccine storage temperature as indicated by the manufacturer’s ***,this literature review study examines the prospects and challenges of implementing solar-powered cold storage to provide cooling space for remote *** is expected to contribute significantly to cold chain vaccine management *** findings showed that four technology integration schemes including Cold Storage Ice Maker,Cold Storage Ice Maker-PCM,Refrigerator-Ice Maker and,Absorbing Cooling-PV-Ice Maker have the potential to be applied in clinics situated in certain tropical regions.

关键词： COVID-19 vaccine cold storage solar power remote clinic

Stepwise Pyrolysis by LBCR Downstream to Enhance of Gasoline Fraction of Liquid Fuel from MMSW

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Energy Engineering 2022年第3期119卷 1169-1178页

作者： Indra Mamad Gandidi Edy Suryadi Efri Mardawati Dwi Rustam Kendarto nugroho agung Pambudi Department of Mechanical Engineering Education Universitas Pendidikan IndonesiaBandung40154Indonesia Postgraduate Student of Doctoral Program Faculty Agroindustrial TechnologyUniversitas PadjadjaranJatinangor45363Indonesia Faculty Agroindustrial Technology Universitas PadjadjaranJatinangor45363Indonesia Department of Mechanical Engineering Education Universitas Sebelas MaretSurakarta57126Indonesia

Pyrolysis is one of the thermal cracking methods to convert hydrocarbon to liquid *** quantity and quality of the process are dependent on several condition including temperature,reaction time,catalyst,and the type of ***,a gasoline fraction was maximum product to be considered in the pyrolisis ***,this study aims to increase the gasoline fraction in liquid fuel using stepwise pyrolysis with a long bed catalytic reactor downstream(LBCR).The LBCR downstream was equipped with the top and bottom outlet and the fed source was mixed municipal solid waste(MMSW).The activated natural dolomite at 500℃ was used to allow the repetition of the secondary ***,the reactor temperature was setup at around 200℃-300℃ and the pyrolizer was 400℃.To analyze the gasoline fraction and physical properties of liquid fuel,Gas Chromatography-Mass Spectroscopy(GC-MS)and ASTM standard were *** experimental results showed there was a significant increase in the gasoline fraction of liquid fuels compared to using direct catalytic cracking and absence of *** using a LBCR at 250℃,the liquid fuel obtained at top outlet(TO)and bottom outlet(BO)have 84.08 and 56.94 percent peak area of gasoline fraction(C5-C12),*** average value(TO and BO)of the fraction at 250℃ by LBCR was 70.51 percent peak area and it was increased by about 93.6%and 51.14%compared to without catalyst and direct catalytic,***,pyrolytic liquid oils were found to have kinematic viscosity of 2.979 and 0.789 cSt,density of 0.781 and 0.782 g/cm^(3),and flash point<−5℃ for BO-250 and TO-250 liquid fuel,*** results showed BO liquid fuel was comparable to diesel conventional fuel while TO liquid fuel was comparable to ***,the presence of LBCR made a major contribution to generate multi secondary cracking and to produce more gasoline fraction from mixed MMSW feedstock,as well as to increase the physical properties of l

关键词： Liquid fuel gasoline fraction LBC MMSW stepwise pyrolysis natural dolomite catalys

Mitigating Carbon Emissions:A Comprehensive Analysis of Transitioning to Hydrogen-Powered Plants in Japan’s Energy Landscape Post-Fukushima

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Energy Engineering 2024年第5期121卷 1143-1159页

作者： nugroho agung Pambudi Andrew Chapman Alfan Sarifudin Desita Kamila Ulfa Iksan Riva Nanda Department of Mechanical Engineering Education Universitas Sebelas MaretSukoharjo57161Indonesia International Institute for Carbon-Neutral Reserch(WPI-I2CNER) Kyushu UniversityFukuoka819-0395Japan Postgraduate of Mechanical Engineering Universitas Sebelas MaretSurakarta57126Indonesia Energy and Society Laboratory Department of Mechanical Engineering EducationUniversitas Sebelas MaretSukoharjo57161Indonesia Department of Metallurgical and Material Engineering Universitas IndonesiaDepok16424Indonesia

One of the impacts of the Fukushima disaster was the shutdown of all nuclear power plants in Japan,reaching zero production in *** response,the country started importing more fossil energy including coal,oil,and natural gas to fill the energy ***,this led to a significant increase in carbon emissions,hindering the efforts to reduce its carbon *** the current situation,Japan is actively working to balance its energy requirements with environmental considerations,including the utilization of hydrogen ***,this paper aims to explore the feasibility and implications of using hydrogen power plants as a means to reduce emissions,and this analysis will be conducted using the energy modeling of the MARKAL-TIMES Japan *** hydrogen scenario(HS)is assumed with the extensive integration of hydrogen into the power generation sector,supported by a hydrogen import ***,this scenario will be compared with the Business as Usual(BAU)*** results showed that the generation capacities of the BAU and HS scenarios have significantly different primary energy *** BAU scenario is highly dependent on fossil fuels,while the HS scenario integrates hydrogen contribution along with an increase in renewable energy,reaching a peak contribution of 2,160 PJ in *** the HS scenario,the target of reducing CO_(2) emissions by 80%is achieved through significant hydrogen *** 2050,the total CO_(2) emissions are estimated to be 939 million tons for the BAU scenario and 261 million tons for the Hydrogen *** addition,the contribution of hydrogen to electricity generation is expected to be 153 TWh,smaller than PV and wind power.

关键词： Business as usual(BAU)scenario hydrogen scenario CO_(2)emissions power generation sector

Engine Performance Using Blended Fuels of Biodiesel and Eco Diesel

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Energy Engineering 2023年第1期120卷 107-123页

作者： Muhammad Idris IHusin Indra Hermawan Uun Novalia RDBatubara nugroho agung Pambudi Alfan Sarifudin Study Program of Mechanical Engineering Universitas Medan AreaMedan20156Indonesia Study Program of Mechanical Engineering Politeknik Negeri MedanMedan20156Indonesia Study Program of Industrial Engineering Universitas Harapan MedanMedan20156Indonesia Department of Mechanical Engineering Education Universitas Sebelas MaretSurakarta57126Indonesia

Diesel engines is an internal combustion engine with high thermal efficiency,which also uses biodiesel fuel,an environmentally friendly,non-toxic,and low sulfur *** has been around for a long time due to its similar characteristics to diesel fuels which has limited ***,several disadvantages are associated with biodiesel,such as poor volatility and high viscosity,which reduces engine ***,this study was carried out to improve the diesel engine performance by mixing biodiesel with ecodiesel(ED),an additive produced from natural ingredients that is dissolvable in *** biodiesel fuel properties used are density 860 kg/m3,dynamic viscosity 4.50E-06 m2/s,cetane number 45,and flashpoint 52°*** results showed that biodiesel-ED mixture could improve engine performance and the optimum performance was at a speed of 3000 rpm on 43.30(kW),124.93(N.m)of the engine torque,and 2.45E–5(kg/kW.s)of the specific fuel *** to paired sample t-test,the difference in the engine performance is only experienced in the torque,which has a significant increase in the composition of the biodiesel+ED by 0.07 gr mixture.

关键词： Car vehicle experiment combustion ED renewable energy

Effects of 8-Hydroxyisocapnolactone-2-3-diol and friedelin on mast cell degranulation

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Asian Pacific Journal of Tropical Medicine 2017年第11期10卷 1043-1046页

作者： Muhammad Novrizal Abdi Sahid agung Endro nugroho Ratna Asmah Susidarti Kazutaka Maeyama Department of Pharmacology Graduate School of MedicineEhime UniversityEhime791-0295Japan Department of Pharmaceutical Chemistry Faculty of PharmacyUniversitas Gadjah MadaYogyakarta55281Indonesia Department of Pharmacology Faculty of PharmacyUniversitas Gadjah MadaYogyakarta55281Indonesia

ObjectiveTo investigate the effects of friedelin (terpenoid) and 8-hydroxyisocapnolactone-2-3-diol (coumarin) with concentration 10 μM, 30 μM, and 100 μM on inhibiting mast cells (MCs) *** investigation was performed in vitro by administering each compound into rat peritoneal MCs and rat basophilic leukemia-2H3 cells followed by activation with 50 μg/mL of compound 48/80 or 1 μM of ionomycin. The concentration of histamine released from each group was measured by a high-performance liquid chromatography-fluorometry system with post-column derivatization using ***8-Hydroxyisocapnolactone-2-3-diol inhibited degranulation of compound 48/80 activated-rat peritoneal MCs with the histamine release percentages of 74.57%, 72.21% and 51.79% when the 10 μM, 30 μM and 100 μM concentrations were used, respectively. Where as about 81% histamine was released by the control group. Degranulation inhibition ability was also observed in ionomycin-activated rat basophilic leukemia-2H3 cells. In contrast, friedelin failed to inhibit degranulation in either cell type. The inhibition of 8-hydroxyisocapnolactone-2-3-diol was not related to the depletion of histamine synthesis as implied by the total histamine *** results exhibit the promising of 8-hydroxyisocapnolactone-2-3-diol is a potential parent structure for developing a MCs stabilizer.

关键词： 8-Hydroxyisocapnolactone-2-3-diol Friedelin Mast cell Degranulation Histamine