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Synthesis of 9-(4-hydroxyphenyl)-3,4,6,7-tetrahydro-2H-xanthene-1,8(5H,9H)-dione using lime and lemon juice as an acidic catalyst and its antioxidant activity

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AIP Conference Proceedings 2021年第1期2353卷

作者： Rini Retnosari Nanda Harisya Puteri Sutrisno Sutrisno Siti Marfu'ah Aman Santoso Dedek Sukarianingsih Yuli Ainun Rosidah 1Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Jl. Semarang 5 Malang 65145 Indonesia 2Chemical Engineering Study Program Sekolah Tinggi Teknik IndustriTuren Malang Indonesia

The 1,8-dioxo-octahydroxantene has many derivates. One of those is 9-(4-hydroxyphenyl)-3,4,6,7-tetrahydro-2H-xanthene-1,8(5H,9H)-dione. This compound has been successfully synthesized from 4-hydroxybenzaldehyde and 1,3-cyclohexanedione. This reaction has been catalyzed by lime and lemon juice under the free solvent condition. It is assumed that citric acid in both materials has a role in catalyzing this reaction. The advantages of using them as catalysts are biodegradable, environmentally safe, and cheap. Besides that, the synthesis of this compound only required one reaction stage, and the product was easily purified. The structure of the pure product was determined by FT-IR, H-NMR, and GC-MS. The antioxidant activity of this compound was investigated by the DPPH method. This compound had an antioxidant activity with inhibition percentage over 53.42%.

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Multiple Linear Regression Analysis On Effect Of Time Variations And Voltage Variations On Spot Welding Against Shear Strength Of Aa5083 Material Using Ibm Spss Application

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IOP Conference Series: Materials Science and engineering 2020年第1期1007卷

作者： Gugun Wiranto Sobron Y Lubis Rosehan Study Program Mechanical Engineering Engineering Faculty Universitas Tarumanagara Jl. Let.Jen S. Parman No.1 Jakarta 11440 Indonesia

Spot welding is one type of welding that is quite widely used in the vehicle industry, as well as ship manufacturing. This study used AA5083 aluminum plate which has a thickness of 1 mm, and overlapping joint. This study examine the effect of voltage and time variations on the value of the shear strength of the welded joint. The material is cut with a size of 200mm x 40mm, welded with voltage variations of 1.75V, 2.2Vand 2.28V. And time variations between 1s, 1.5s and 2s, 300Nconstant pressure and uses copper electrodes with a diameter of 8mm. Multiple linear regression analysis is carried out and the effect of variabel X1 (stress) + X2 (time) on Y (shear strength) is 50.4%, where X1 is 22.7% and X2 is 27.8%. It states that there is no influence between X1 and X2 on Y, because the more dominant data is the data at 1.75V and 2.2Vvoltages which have no significant difference. At 2.28V the material will receive more heat so as to allow the material to melt and have a greater HAZ area as well as the material thickness decreases so that it will affect the shear strength very significantly.

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Timor natural clay as TiO2 modifier to enhance DSSC efficiency using dye chlorophyll from Leucaena leucocephala (Lam.), chromolaena odorata and lannea coromandelica leaves

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AIP Conference Proceedings 2021年第1期2370卷

作者： Odi Th. E. Selan Anika E. Sari Arty N. Manafe Mares J. Nobrihas Antonius R. B. Ola Reiner I. Lerrick Alfius R. Kale 1)Chemistry Study Program Faculty of Science and Engineering Nusa Cendana University Jalan Adisucipto Penfui Kupang – NTT 85110 Indonesia 2)Bioscience Laboratory Nusa Cendana University Jalan Adisucipto Penfui Kupang – NTT 85110 Indonesia

The improvement of dye sensitized solar cell (DSSC) efficiency using clay from Timor to modify TiO2 semiconducting material with chlorophyll dyes as photosensitisers had been conducted. This investigation employed doctor blade method for photoelectrochemical cell design and testing using chlorophyll from three different plant leaves namely Leucaena leucocephala (Lam.), (A), Lannea coromandelica (B) and Cromoleana Odorata (C). Infra-Red, X-Ray Fluorescence and X-Ray Diffraction analysis show that the main chemical compositions of the clay are SiO2 (53%), Fe2O3 (22,2%) and Al2O3 (13%) identified as a typical bentonite clay. We found that the addition of clay onto TiO2 increased the efficiency of cells using these three different source of chlorophylls (A - from 0.0437 to 0.7502%, B - from 1.203 to 1.450% and C - from 0.034 to 0.284%) potential for further purifications or activations and applications.

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Synthesis of 9-(4-bromophenyl)-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-dione using lime and lemon juice as a green catalyst and its antioxidant activity

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AIP Conference Proceedings 2021年第1期2353卷

作者： Rini Retnosari Anita Lestari Siti Marfu’ah Aman Santoso Dedek Sukarianingsih Yuli Ainun Rosidah 1Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Jl Semarang 5 Malang 65145 Indonesia 2Chemical Engineering Study Program Sekolah Tinggi Teknik Industri Turen Malang Indonesia

Synthesis of 9-(4-bromophenyl)-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-dione (compound 1) using lime and lemon juices as catalyst under free solvent condition has been successfully done. Both fruits contained citric acid, which operates as an acidic catalyst. The structure of compound 1 was confirmed by IR, H-NMR, and MS spectra. The use of the natural product as a green catalyst has some advantages, that is eco-friendly, cheap, high availability, and biodegradable. DPPH methods were used as methods to determine the antioxidant properties of compound 1. This compound has properties as antioxidant with inhibition percentage of 59.20%, 65.38%, 67.41%, 68.53%, 70.0% at 2, 4, 6, 8, and 10 ppm respectively.

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Analysis on calculation of Vehicle Operating Cost (VOC) at Gejayan intersection before and after fly over ring road operation in Yogyakarta

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IOP Conference Series: Earth and Environmental Science 2019年第1期340卷

作者： R E Wibisono M S D Cahyono A Muhtadi Program Study of Civil Engineering Engineering Faculty Narotama University Program Study of Civil Engineering Engineering Faculty Widya Kartika University

Gejayan intersection is located in Sleman Regency of Yogyakarta. Fly Over will be constructed at the intersection in the ring road of Yogyakarta. The nearest intersection to the east is Gejayan Intersection with a distance of 1573.11 meters. Gejayan intersection performance in 2018 has reached saturation by having Level of Service E. The more severe conditions will occur in the next 10-20 years. If it is planned using Fly Over on the ring road in Yogyakarta connecting Gejayan intersection, the vehicles flow must have other alternative by road widening. The most important step is to predict the Vehicle Operating Costs (VOC). After the Fly Over operation, VOC can be calculated to determine the cost saving. The scenario to predict VOC was 80% of vehicle volume would pass the Fly Over, and the 20% would still use the existing road. The results showed that the cost saving of Vehicle Operating Costs (VOC) of the existing road compared to the fly over use in 2019 was IDR 37,941,324,952. In 2039 the saving would be IDR 240,232,694,488. If the road was only widened, the cost saving of VOC in 2019 would be IDR 9,084,204923 and in 2039 would be IDR 72,107,188,198.

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Combination of Otsu and Canny Method to Identify the Characteristics of Solo Batik as Surakarta Traditional Batik

Combination of Otsu and Canny Method to Identify the Charact...

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International Conference of Computer and informatics engineering (IC2IE)

作者： Jani Kusanti Agung Suprapto Faculty of Electrical and Information Engineering Informatics Study Program Surakarta University Surakarta Central Java Indonesia Faculty of Da'wah Islamic Broadcast Communication Studies (KPI) IAIN Salatiga Salatiga Central Java Indonesia

ISBN: (纸本)9781728123851

Batik Surakarta has characteristics that not everyone understands, the difference in characteristics lies in the design characteristics, primary colors, and motifs. Surakarta's traditional batik designs and motifs have cultural values that are worth preserving. The combination of the otsu method and the canny method is used to build an application system to improve the results of identifying traditional Surakarta batik images, characteristic features, and shapes of batik patterns. Segmentation is done by partitioning the image into the object area using otsu and determining the boundary of the object using canny to get the characteristics of the image. The results of segmentation processed by selecting and extracting features by selecting quantitative information from existing features using the GLCM method. The characteristics taken are energy, homogeneity, correlation, and contrast. The results of the four characteristics classified into seven Surakarta batik classes, namely Kawung motif, Sido Mukti motif, Truntum motif, Sawat motif, Satrio Manah motif, Parang motif, and Semen Rante motif. The data used are 100 image data, which divided into 70 training data and 30 test data. The results showed that the accuracy rate was 93%.

关键词： Image edge detection Feature extraction Image segmentation informatics Backpropagation Gray-scale Correlation

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A Benchmark Model for Predicting Building Energy and Daylight Performance in The Early Phase of Design Utilizing Parametric Design Exploration

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IOP Conference Series: Earth and Environmental Science 2021年第1期830卷

作者： Rendy Perdana Khidmat Hiroatsu Fukuda Kustiani Andi Prasetiyo Wibowo Fukuda Laboratory Graduate School of Environmental Engineering The University of Kitakyushu Kitakyushu Japan Architecture Study Program Department of Infrastructure and Regional Technology Institut Teknologi Sumatera Lampung Indonesia Department of Architecture Faculty of Engineering Bandar Lampung University Lampung Indonesia. Department of Architecture Universitas Atma Jaya Yogyakarta Yogyakarta Indonesia.

Along with the enormous impact on computational development in architecture and urban design, the way in approaching the built environment is shifting and intended to look closer to performance and evidence-based design. This development holds promise in handling complex computation to approach desired targeted design goals. However, the implementation of form-finding and design performance optimization still lacks, particularly in Japan's sub-tropical climate. This paper describes the parametric design and design exploration process's implementation through the generative algorithm platform to develop a benchmark model to predict building energy and daylight performance and find possible design solutions from the iteration process during the early phase of the design process. The variables incorporated related to the glazing ratio, the length of the overhang, and building orientation. Grasshopper, a parametric-based plugin that works in Rhinoceros, is used to arrange a parametric definition for the overall experiment. The tools used to investigate the environmental analysis and energy consumption are Ladybug and Honeybee, and the exploration process will be conducted using Design Explorer. The context will be situated in Orio district and uses the EPW file of Kitakyushu city, Fukuoka, Japan. The results of this research furthermore can potentially be a comparison for more dynamic factors.

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Thermochemical Equilibrium Modelling of Steam Gasification of Char from Pattukku Coal Using Cao As Co2 Absorbent

Thermochemical Equilibrium Modelling of Steam Gasification o...

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International Conference on Industrial Technology for Sustainable Development 2017, ICon-ITSD 2017

作者： Syarif, Takdir Sulistyo, Hary Sediawan, Wahyudi Budi Budhijanto Chemical Engineering Study Program Faculty of Industrial Technology Universitas Muslim Indonesia Kampus II UMI Jl. Urip Sumoharjo KM. 05 Makassar Indonesia Chemical Engineering Department Engineering Faculty Universitas Gadjah Mada Jl. Grafika 2 Yogyakarta Indonesia

Although it is not able to provide highly accurate results, mathematical models can provide guidance regarding the quantitative influence of design, raw material, and other operating parameters. In addition, the representation of gasification in the form of mathematical equations can help understand the importance of the influence of operating parameters on the performance of a gasifier and can give a good understanding of the mechanisms that occur. In this paper, the steam gasification of char from Pattukku coal using CaO as CO2 absorbent in updraft gasifier was investigated. The aim is to determine the influence of temperature on syngas composition. A mathematical model based on the stoichiometric approach was developed in this study and the results were compared with experimental data. A mixture of coal and lime (CaO) with a ratio of 1:1.5 is fed into the reactor. The electric heater (furnice) is turned on to raise the temperature of the reactor until it reaches the desired reaction temperature (i.e. 600, 700, and 800 °C). When the reaction temperature is reached, steam was flowed from the bottom of the reactor to be reacted with the char present in the reactor. The steam gasification carried out at a fixed temperature for 60 minutes and every 15 minutes, samples were taken for analysis. Base on the result of the experimental and calculation showed if the temperature of gasifier increase by 100 °C, the volume of gas will increase by approximately 1.7 time. The calculation showed that the proposed model could quantitatively be applied to predict the gas composition of steam gasification of char. © Published under licence by IOP Publishing Ltd.

关键词： Carbon dioxide

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Comparison Analysis Operastional Cost of Vehicle (VOC) Between Kayu Agung-Palembang-Betung Toll Road Plan with Existing Road

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IOP Conference Series: Earth and Environmental Science 2019年第1期396卷

作者： E Kadarsa Hanafiah B B Adhitya M Pataras A Azari Lecturer in Civil Engineering Study Program Faculty of Engineering Sriwijaya University Student in Civil Engineering Study Program Faculty of Engineering Sriwijaya University

South Sumatra is one of the provinces whose development is very rapid in Indonesia. With the increasing development of centers of economic activity, politics, socio-culture and education make it an attraction for residents outside the city to travel to Palembang City. However, the condition of the eksisting highway which has become the driver's mainstay for travelling are not free of congestion. This causes travel time and Vehicle operational costs increase for every vehicle that passes the road. To overcome this problem, the government brought investors to build a toll road. The results of preliminary research show that people are still confused about the benefits through toll roads which are built besides travel time faster because they have to spend money to pay tolls. The main objective of this study was to determine the vehicle operating costs (VOC) using both roads with the Pacific Consultant International Method (PCI) and Industrial and Affiliate Research, Bandung Institute of Technology (LAPI ITB). Variable of the equation to determine the cost components is travel speed determined the Floating Car Method. The results show that the operational costs of vehicles (VOC) through toll roads are smaller when compared with existing roads. VOC of passenger cars that pass through the existing road in the morning Rp. 3395.45, trucks 2 axles loaded Rp. 5570.55 and trucks 2 axles with no payload of Rp. 3815.00, while if through toll road, passenger cars Rp. 2618.82 and trucks 2 axles Rp. 2918.71. In addition, information is obtained, more than 90% of drivers only consider fuel costs, they do not consider the cost of other variable variables in choosing a route.

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Analysis of variables that influence formation of waste management institutions in Indonesia

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IOP Conference Series: Materials Science and engineering 2020年第2期830卷

作者： L S Akliyah N Kurniasari O Odah H Burhanudin I Fachrudin A Alhamd A Fachmi C Wibowo Urban and Regional Planning Program Study Faculty of Engineering Universitas Islam Bandung Jalan Tamansari No. 1 Bandung 40116 Indonesia

One of the Sustainable Development Goals main objective is clean water and sanitation. It can be implementated by applying the 3R (Reduce, Reuse, Recycle) concept in waste management. One of the villages in West Bandung Regency which is expected to be able to apply the 3R concept in waste management is Kiangroke Village. The application of this concept that began about 3 months ago by forming a garbage collector. The formation of waste management institutions in that village is expected to be realized in the future. So that, it can provide economic value to the village. For this reason, it is necessary to analyze the variables that affect formation of waste management institution in Kiangroke Village. The objectives of this study are: identification of variables that affect formation of waste management institution and mapping the relationships between variables. The data collection method was carried out through a questionnaire. There were 10 variables concidered in the research based on the Focus Group Discussion. The analysis method is the Micmac analysis. Based on the the analysis, it was found that the most influential and most dependent variables included the role of the village government, the role of the environmental awareness group, availability of facilities and infrastructure, and the budget availability. Based on this, it is necessary to have an institutional waste manager accompanied by the availability of facilities, infrastructure, and budget.

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