International Journal of Advances in Engineering Sciences and Applied Mathematics最新文献_第4页

A new transmissometer method that measures runway visibility across a short distance 一种测量短距离跑道可见度的透射仪新方法

International Journal of Advances in Engineering Sciences and Applied Mathematics Pub Date : 2023-09-01 DOI: 10.11591/ijaas.v12.i3.pp285-292

Mariam Mohamed Abud

引用次数: 0

Antioxidant activity and inhibition of α-glucosidase from extract and fraction of leaves and stems of Vernonia amygdalina 苦扁桃叶、茎提取物及部位抗氧化活性及α-葡萄糖苷酶抑制作用

International Journal of Advances in Engineering Sciences and Applied Mathematics Pub Date : 2023-09-01 DOI: 10.11591/ijaas.v12.i3.pp274-284

Siahaan Rafael, I Made Artika, Waras Nurcholis

{"title":"Antioxidant activity and inhibition of α-glucosidase from extract and fraction of leaves and stems of Vernonia amygdalina","authors":"Siahaan Rafael, I Made Artika, Waras Nurcholis","doi":"10.11591/ijaas.v12.i3.pp274-284","DOIUrl":"https://doi.org/10.11591/ijaas.v12.i3.pp274-284","url":null,"abstract":"Previous studies have shown that bitter leaf (Vernonia amygdalina Del.) has the ability as an antioxidant and an α-glucosidase inhibitor. Still, the difference in antioxidant activity and α-glucosidase inhibition based on the leaves and stems parts have not yet been determined. The effect of flavonoid-enriched extract on antioxidant activity and inhibition of α-glucosidase has not yet been determined. This research aimed to assess the impact of flavonoid-enriched extract from the leaves and stems part of the bitter leaf. The leaves and stems part of the bitter leaf were extracted using Soxhlet apparatus with 80% methanol and then underwent successive fractionation with petroleum ether, chloroform, and ethyl acetate. The crude extract and the fraction were concentrated and followed by the determination of total flavonoid, total phenolic, antioxidant activity, α-glucosidase inhibition activity, and calculated the IC50 of α-glucosidase inhibition. This research showed that chloroform-ethyl acetate leaf fraction was the best fraction with the higher total flavonoid (24.091±0.972 mg QE/g DW), total phenolic (84.299±4.589 mg GAE/g DW), diphenylpicrylhydrazyl (DPPH) antioxidant activity (33.881 μM TE/g DW), ferric reducing antioxidant power (FRAP) antioxidant activity (312.022±1.745 μM TE/g DW) and α-glucosidase inhibition activity with an IC50 value 1.23 mg/mL.","PeriodicalId":44367,"journal":{"name":"International Journal of Advances in Engineering Sciences and Applied Mathematics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135587756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Groundwater recharge estimation using chloride mass balance method on the southern slope of Merapi Volcano, Indonesia 用氯化物质量平衡法估算印尼默拉皮火山南坡地下水补给

International Journal of Advances in Engineering Sciences and Applied Mathematics Pub Date : 2023-09-01 DOI: 10.11591/ijaas.v12.i3.pp265-273

Restu Dwi Cahyo Adi, Wahyu Wilopo, Hendy Setiawan

{"title":"Groundwater recharge estimation using chloride mass balance method on the southern slope of Merapi Volcano, Indonesia","authors":"Restu Dwi Cahyo Adi, Wahyu Wilopo, Hendy Setiawan","doi":"10.11591/ijaas.v12.i3.pp265-273","DOIUrl":"https://doi.org/10.11591/ijaas.v12.i3.pp265-273","url":null,"abstract":"Groundwater is a main resource for the majority of Indonesian people as a source of clean water to meet their daily needs. The increase in groundwater use is unavoidable due to increasing development in Indonesia, especially in Yogyakarta. Groundwater recharge is important in the hydrological cycle to meet groundwater needs. Therefore, this study aims to estimate groundwater recharge by the chloride mass balance (CMB) method on the southern slope of Merapi Volcano in Yogyakarta, Indonesia. This research was conducted in the rainy and dry seasons from August 2022 until January 2023. This research collects annual rainfall near the study area from the Meteorology, Climatology, and Geophysics Agency (BMKG) Yogyakarta station, monthly data collected from eighteen samples of groundwater station, and monthly data collected from fifteen samples of rainwater in the study area. The chemical content of groundwater and rainwater samples is analyzed using argentometry to obtain chloride concentration. The result of annual rainfall in the study area is 3,603.878 mm/year. The average chloride concentration in rainwater is 1.1 mg/L, while the average chloride concentration in groundwater is 8.015 mg/L. The CMB method calculation showed that the recharge in the study area ranges from 171.65 to 1,711.29 mm/year. The groundwater recharge has a positive correlation with elevation and rainfall. High groundwater recharge is also found in the northern area due to fractured lava aquifer.","PeriodicalId":44367,"journal":{"name":"International Journal of Advances in Engineering Sciences and Applied Mathematics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135588088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A receiver-side power control method for series-series magnetic topology in inductive contactless electric vehicles battery charger application 一种串联磁拓扑接收器侧功率控制方法在感应式非接触式电动车电池充电器中的应用

International Journal of Advances in Engineering Sciences and Applied Mathematics Pub Date : 2023-09-01 DOI: 10.11591/ijaas.v12.i3.pp234-249

Bhukya Bhavsingh, Gotluru Suresh Babu, Bhukya Mangu, Ravikumar Bhukya

引用次数: 0

Case study on reliability improvement of sinter cooler fan 提高烧结冷却风机可靠性的实例研究

IF 0.9

International Journal of Advances in Engineering Sciences and Applied Mathematics Pub Date : 2023-09-01 DOI: 10.1007/s12572-023-00344-5

Aditya Jain, Himangshu S. Mandal, T. Thirumurugan, N. R. Kumar, Chandra Bhushan

引用次数: 0

ANSYS investigation of solar photovoltaic temperature distribution for improved efficiency ANSYS研究太阳能光伏温度分布，提高效率

International Journal of Advances in Engineering Sciences and Applied Mathematics Pub Date : 2023-09-01 DOI: 10.11591/ijaas.v12.i3.pp293-300

Paul Rousseau, Hassan Nouri

引用次数: 0

Fractal analysis to determine JRC on sandstones and its correlation to SRF, Ende-Lianunu Regency, East Nusa Tenggara Province, Indonesia 印度尼西亚东努沙登加拉省Ende-Lianunu Regency砂岩JRC的分形分析及其与SRF的相关性

International Journal of Advances in Engineering Sciences and Applied Mathematics Pub Date : 2023-09-01 DOI: 10.11591/ijaas.v12.i3.pp214-225

Tien Veny Vera, Sari Bahagiarti Kusumayudha, Singgih Saptono, Kurniawan Kurniawan

{"title":"Fractal analysis to determine JRC on sandstones and its correlation to SRF, Ende-Lianunu Regency, East Nusa Tenggara Province, Indonesia","authors":"Tien Veny Vera, Sari Bahagiarti Kusumayudha, Singgih Saptono, Kurniawan Kurniawan","doi":"10.11591/ijaas.v12.i3.pp214-225","DOIUrl":"https://doi.org/10.11591/ijaas.v12.i3.pp214-225","url":null,"abstract":"The study area is located in Ende-Lianunu Regency, East Nusa Tenggara Province, Indonesia, with mountainous and hilly morphology, and is part of the Kiro Formation which is composed of tuffaceous sandstones. Discontinuities in the sandstone are in the form of bedding planes and joints, which affect the mechanical properties of the rock mass, reduce its strength, and affect slope stability. The discontinuity condition that affects mechanical behavior is surface roughness. This research aims to define the fractal dimension value of surface roughness using a box-counting method, joint roughness coefficient (JRC), and simulate the strength reduction factor (SRF) value on slopes that have a certain JRC. The fractal dimension of fine-grained samples = 1.0010 and coarse-grained = 1.0056. The average JRC value is 6.25 (Range 4-6). Simulation at JRC 0-20, gives different SRF values. On slopes with JRC = 0, the critical SRF = 1.35. If JRC = 20, the critical SRF = 1.47. It can be inferred, that the fractal dimension of the roughness of the sliding plane correlates with JRC and SRF. As the fractal dimension value increases, so do the JRC and SRF values, resulting in more stable slope conditions.","PeriodicalId":44367,"journal":{"name":"International Journal of Advances in Engineering Sciences and Applied Mathematics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135588225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical and thermal properties of recycled polypropylene bamboo fibre-reinforced composites 再生聚丙烯竹纤维增强复合材料的机械和热性能

International Journal of Advances in Engineering Sciences and Applied Mathematics Pub Date : 2023-09-01 DOI: 10.11591/ijaas.v12.i3.pp205-213

Indah Widiastuti, Devan Hidayat Pratama, Mohamad Lukmanul Hakim, Danar Susilo Wijayanto, Budi Harjanto

{"title":"Mechanical and thermal properties of recycled polypropylene bamboo fibre-reinforced composites","authors":"Indah Widiastuti, Devan Hidayat Pratama, Mohamad Lukmanul Hakim, Danar Susilo Wijayanto, Budi Harjanto","doi":"10.11591/ijaas.v12.i3.pp205-213","DOIUrl":"https://doi.org/10.11591/ijaas.v12.i3.pp205-213","url":null,"abstract":"In this article, a kind of green composite was prepared from recycled polypropylene (r-PP) which was further reinforced with various loadings of chemically modified bamboo fibres. Effects of bamboo fibre loading on the mechanical and thermal properties of r-PP/bamboo composites were studied. Those properties were characterized by tensile testing, impact testing, thermogravimetric analysis (TGA), and differential scanning calorimeter (DSC). Standardized test specimens with 0%, 10%, 20%, and 30% mass fractions of bamboo fibre were obtained by an extrusion process which was then finalized on injection molding. The experiment revealed the tensile strength and strain of the composite become greater with the increase of bamboo fraction in the ultimate value of 20% mass fraction. The composite with 10% bamboo fibre loading recorded the highest value of impact strength. Meanwhile, it was evident that the presence of bamboo fibre decreased the thermal stability of recycled polypropylene materials. Therefore, this composite material may find good potential for semi-structural loading applications in relatively low-exposure working.","PeriodicalId":44367,"journal":{"name":"International Journal of Advances in Engineering Sciences and Applied Mathematics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135588194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study of RDF-5 performance based on natural waste on fast pyrolysis process on the quality of the liquid smoke 基于自然废弃物的RDF-5性能快速热解工艺对液烟质量的影响实验研究

International Journal of Advances in Engineering Sciences and Applied Mathematics Pub Date : 2023-09-01 DOI: 10.11591/ijaas.v12.i3.pp250-256

Herman Saputro, Laila Fitriana, Aris Purwanto, Riyadi Muslim, Muchlis Mahmuddin

{"title":"Experimental study of RDF-5 performance based on natural waste on fast pyrolysis process on the quality of the liquid smoke","authors":"Herman Saputro, Laila Fitriana, Aris Purwanto, Riyadi Muslim, Muchlis Mahmuddin","doi":"10.11591/ijaas.v12.i3.pp250-256","DOIUrl":"https://doi.org/10.11591/ijaas.v12.i3.pp250-256","url":null,"abstract":"Energy problems are one of the cases faced by almost all countries in the world. No longer found oil reserves in significant quantities causing problems in the energy sector. The world's energy needs continue to increase and become a global problem in the use of energy in various sectors resulting in an energy crisis. The use of waste-to-energy (WtE) technology is appropriate, considering that energy needs continue to increase along with the increasing amount of waste that is not managed and hurts the ecosystem. Refuse-derived fuel (RDF) is a waste management technique that converts waste into bio-solid fuel. RDF is produced from the mechanical separation of combustible and non-combustible fractions from waste. Utilizing RDF biomass from durian peel and sugar palm is one of the efforts to maximize the pyrolysis process in organic waste, increasing the combustion potential. Processing durian skin and sugar palm waste into RDF will maximize the potential of the combustion results, which can later facilitate testing. This study also aims to utilize sugar palm waste and durian peel to have a use value as an alternative fuel. This research was an experimental study, fast pyrolysis was employed by using 300 grams both in durian and sugar palm, and the temperature was varied from 400, 500, and 600 °C. The results showed that the test of liquid smoke RDF-5 sugar palm at a temperature of 400 °C at 112 mL and RDF-5 durian at 600 °C at 137 mL.","PeriodicalId":44367,"journal":{"name":"International Journal of Advances in Engineering Sciences and Applied Mathematics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134995623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of adding sodium tripolyphosphate on thiobarbituric acid value, crispiness, and organoleptic on salted egg crackers 添加三聚磷酸钠对咸蛋饼干硫代巴比妥酸值、脆度和感官的影响

International Journal of Advances in Engineering Sciences and Applied Mathematics Pub Date : 2023-09-01 DOI: 10.11591/ijaas.v12.i3.pp226-233

Siti Susanti, Rafli Zulfa Kamil, Finky Firsya Fardiah

{"title":"The effect of adding sodium tripolyphosphate on thiobarbituric acid value, crispiness, and organoleptic on salted egg crackers","authors":"Siti Susanti, Rafli Zulfa Kamil, Finky Firsya Fardiah","doi":"10.11591/ijaas.v12.i3.pp226-233","DOIUrl":"https://doi.org/10.11591/ijaas.v12.i3.pp226-233","url":null,"abstract":"Crackers are one of the dry foods that can experience volume expansion when fried. Salted egg crackers are a form of innovation and product diversification in crackers, which are made using ingredients containing starch and various other additives. This study aims to determine the exact concentration in the use of sodium tripolyphosphate as a crunch in dough on the crispness, thiobarbituric acid (TBA) value, and organoleptic of the salted egg crackers. There were 4 sodium tripolyphosphate (STPP) concentration treatments, namely 0% (T1), 0.25% (T2), 0.5% (T3), and 0.75% (T4). This research method consists of experimental design, research procedures, parameter tests, and data analysis. The results of the analysis of the TBA value showed that the difference in the concentration of STPP affected the rancidity of the salted egg crackers, where the higher the concentration of STPP, the higher the TBA value. Crispness and organoleptic analysis showed the highest value and overall preference, namely 0.75% (T3) treatment. This study concludes that the difference in the concentration of the addition of sodium tripolyphosphate affects the crispness of crackers.","PeriodicalId":44367,"journal":{"name":"International Journal of Advances in Engineering Sciences and Applied Mathematics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135588087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0