Pub Date : 1900-01-01DOI: 10.5220/0010132800002775
P. Rizky, .. Tamrin, .. Marpongahtun
{"title":"Synthesis of Semi Interpenetrating Polymer Network’s Hydrogel from Bacterial Cellulose","authors":"P. Rizky, .. Tamrin, .. Marpongahtun","doi":"10.5220/0010132800002775","DOIUrl":"https://doi.org/10.5220/0010132800002775","url":null,"abstract":"","PeriodicalId":257157,"journal":{"name":"Proceedings of the 1st International MIPAnet Conference on Science and Mathematics","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132818747","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}
Pub Date : 1900-01-01DOI: 10.5220/0010137100002775
A. Nuryawan, I. Risnasari, Hana Pratiwi Sihombing, D. Situmorang
: The objective of this study was to evaluate production and properties of liquefied oil-palm stem adhesive. Method for production of this adhesive was inspired by bio-refinery concept. In this context, vascular bundle of oil-palm stem was liquefied through liquefaction process involving thermo-chemical reaction using chemicals of H 2 SO 4 , phenol, and NaOH at 90 C. Properties of the adhesive were compared to Indonesian Standard for phenol-formaldehyde (PF) resins. Results of the examinations showed color of the liquefied adhesive was brown-blackish, specific gravity was 1.26, solid content was 86%, viscosity was 111 cP, pH was 7.8, gel time was 98 minutes, and free formaldehyde was not detected. Even though the properties of the liquefied adhesive made of vascular bundles’ oil-palm stem were slightly differ from PF resin, application of this adhesive as binder of wood product should be recommended because of its feasibility as the adhesive.
{"title":"Production and Properties of Liquefied Oil-palm Stem Adhesive","authors":"A. Nuryawan, I. Risnasari, Hana Pratiwi Sihombing, D. Situmorang","doi":"10.5220/0010137100002775","DOIUrl":"https://doi.org/10.5220/0010137100002775","url":null,"abstract":": The objective of this study was to evaluate production and properties of liquefied oil-palm stem adhesive. Method for production of this adhesive was inspired by bio-refinery concept. In this context, vascular bundle of oil-palm stem was liquefied through liquefaction process involving thermo-chemical reaction using chemicals of H 2 SO 4 , phenol, and NaOH at 90 C. Properties of the adhesive were compared to Indonesian Standard for phenol-formaldehyde (PF) resins. Results of the examinations showed color of the liquefied adhesive was brown-blackish, specific gravity was 1.26, solid content was 86%, viscosity was 111 cP, pH was 7.8, gel time was 98 minutes, and free formaldehyde was not detected. Even though the properties of the liquefied adhesive made of vascular bundles’ oil-palm stem were slightly differ from PF resin, application of this adhesive as binder of wood product should be recommended because of its feasibility as the adhesive.","PeriodicalId":257157,"journal":{"name":"Proceedings of the 1st International MIPAnet Conference on Science and Mathematics","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129177329","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}
Pub Date : 1900-01-01DOI: 10.5220/0010199800002775
M. Zulham, Efendi Sinaga, C. F. Zuhra, E. Zaidar, F. Sebayang, Rumondang Bulan, Dea Rahmadana
: One of the favorite fruits in Medan-Indonesia is durian. The number of fruit is comparable to the most waste of durian seed produced. Seeds are one of the ways to breed through the process of germination. In the process of germination which plays an important role is the enzyme amylase. Based on this, the research aims to isolate the enzyme amylase found in durian seed sprouts on the fifth day through dialysis with ammonium sulfate and then determined its activity against temperature, pH, substrate concentration. Through this research, the enzyme amylase has been isolated from the sprouts of durian beans with the best activity at temperature 40 oC (36.87 U/ml), pH 7 (36.86 U/ml), substrate concentration 1% (26.36 U/ml). The best ammonium sulfate saturation in the dialysis process is 60% acquired enzyme activity of 58.59 U/ml.
{"title":"Isolation and Determination of Amylase Enzyme Activity from Durian Seed Sprouts","authors":"M. Zulham, Efendi Sinaga, C. F. Zuhra, E. Zaidar, F. Sebayang, Rumondang Bulan, Dea Rahmadana","doi":"10.5220/0010199800002775","DOIUrl":"https://doi.org/10.5220/0010199800002775","url":null,"abstract":": One of the favorite fruits in Medan-Indonesia is durian. The number of fruit is comparable to the most waste of durian seed produced. Seeds are one of the ways to breed through the process of germination. In the process of germination which plays an important role is the enzyme amylase. Based on this, the research aims to isolate the enzyme amylase found in durian seed sprouts on the fifth day through dialysis with ammonium sulfate and then determined its activity against temperature, pH, substrate concentration. Through this research, the enzyme amylase has been isolated from the sprouts of durian beans with the best activity at temperature 40 oC (36.87 U/ml), pH 7 (36.86 U/ml), substrate concentration 1% (26.36 U/ml). The best ammonium sulfate saturation in the dialysis process is 60% acquired enzyme activity of 58.59 U/ml.","PeriodicalId":257157,"journal":{"name":"Proceedings of the 1st International MIPAnet Conference on Science and Mathematics","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133711794","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}
Pub Date : 1900-01-01DOI: 10.5220/0010199500002775
I. Nurwahyuni, R. Sinaga, M. Situmorang
{"title":"Selection of Good Quality Mother Plant to be Used as Sources of Explants for in Vitro Propagation of Sumatra Benzoin (Styrax benzoin Dryander)","authors":"I. Nurwahyuni, R. Sinaga, M. Situmorang","doi":"10.5220/0010199500002775","DOIUrl":"https://doi.org/10.5220/0010199500002775","url":null,"abstract":"","PeriodicalId":257157,"journal":{"name":"Proceedings of the 1st International MIPAnet Conference on Science and Mathematics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132580878","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}
Pub Date : 1900-01-01DOI: 10.5220/0010137400002775
L. Chin, E. Chendra, A. Sukmana
: An investor wants the value of his or her money does not have a decline in value against inflation. For this reason, investors need to invest in financial instruments, one of which is stocks. Thus, investors need to create an optimum stock portfolio. Generally, the factors considered by investors in creating an optimum portfolio are expectations of return and portfolio risk. However, besides these two factors, the liquidity is also an important factor to be considered. These three factors will be discussed in this paper to form an optimum portfolio. In addition, because stock transactions use lot units, the optimization problem here is a mixed-integer linear programming optimization problem that will be solved using the Branch and Bound algorithm that is available in toolbox Matlab 2016. This optimization problem will be applied to the formation of a portfolio consisting of stocks in LQ45 index. The LQ45 Stock Index was chosen because shares in this index have high liquidity levels according to the Indonesia Stock Exchange. The computation results show that the portfolio rebalancing model can form a portfolio based on the level of satisfaction of investor.
{"title":"Optimum Stocks Portfolio Selection using Fuzzy Decision Theory","authors":"L. Chin, E. Chendra, A. Sukmana","doi":"10.5220/0010137400002775","DOIUrl":"https://doi.org/10.5220/0010137400002775","url":null,"abstract":": An investor wants the value of his or her money does not have a decline in value against inflation. For this reason, investors need to invest in financial instruments, one of which is stocks. Thus, investors need to create an optimum stock portfolio. Generally, the factors considered by investors in creating an optimum portfolio are expectations of return and portfolio risk. However, besides these two factors, the liquidity is also an important factor to be considered. These three factors will be discussed in this paper to form an optimum portfolio. In addition, because stock transactions use lot units, the optimization problem here is a mixed-integer linear programming optimization problem that will be solved using the Branch and Bound algorithm that is available in toolbox Matlab 2016. This optimization problem will be applied to the formation of a portfolio consisting of stocks in LQ45 index. The LQ45 Stock Index was chosen because shares in this index have high liquidity levels according to the Indonesia Stock Exchange. The computation results show that the portfolio rebalancing model can form a portfolio based on the level of satisfaction of investor.","PeriodicalId":257157,"journal":{"name":"Proceedings of the 1st International MIPAnet Conference on Science and Mathematics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121980416","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}
Pub Date : 1900-01-01DOI: 10.5220/0010199600002775
B. N. L. Gultom, K. Nurtjahja, A. Bungsu, J. Simanullang, J. E. Silalahi, .. Riyanto
{"title":"Enumeration of Fungal Population Isolated from Dried-stored Spices at Retailers in Traditional Markets in Medan, North Sumatera","authors":"B. N. L. Gultom, K. Nurtjahja, A. Bungsu, J. Simanullang, J. E. Silalahi, .. Riyanto","doi":"10.5220/0010199600002775","DOIUrl":"https://doi.org/10.5220/0010199600002775","url":null,"abstract":"","PeriodicalId":257157,"journal":{"name":"Proceedings of the 1st International MIPAnet Conference on Science and Mathematics","volume":"26 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116788191","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}
Pub Date : 1900-01-01DOI: 10.5220/0010152000002775
A. Warman, H. Nainggolan, M. Harahap, .. Dellyansyah, Grace Nainggolan, Suhut Alexander Situmorang, S. Gea
{"title":"Morphological Investigation of Electrospun Nanofibers Cellulose Acetate-based Membrane","authors":"A. Warman, H. Nainggolan, M. Harahap, .. Dellyansyah, Grace Nainggolan, Suhut Alexander Situmorang, S. Gea","doi":"10.5220/0010152000002775","DOIUrl":"https://doi.org/10.5220/0010152000002775","url":null,"abstract":"","PeriodicalId":257157,"journal":{"name":"Proceedings of the 1st International MIPAnet Conference on Science and Mathematics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117022140","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}
Pub Date : 1900-01-01DOI: 10.5220/0010139100002775
H. Br Sembiring, Mesy Jelisa
: Flavonoids included polyphenol compounds that are found in many plants which are important compounds in human food.The flavonoid group, including flavanone, flavone, dihydroflavonol, catechin, flavonol, flavan-3-ols, isoflavones, auron, anthocyanidins, proanthocyanidins and chalcones, has a general structure of C6-C3-C6. The aims of this study is to isolate and identify the group of flavonoid compound contained in rambutanbark ( Nephelium lappaceum L.). Rambutan bark powder was extracted maceration with methanol. Methanol extract was dissolved with ethyl acetate repeatedly until the solution was negative flavonoids. Ethyl acetate extract was dissolved with methanol and partitioned with n -hexane. The methanol extract which is a total of flavonoids separated by column chromatography using chloroform: methanol (90:10; 80:20 and 70:30 (v/v)). The isolates obtained were purified by preparative thin layer chromatography and producing flavonoid glycoside, yellow amorphous with Rf value of 0.25 using the chloroform: ethyl acetate eluent (50:50) v/v. The pure isolate obtained were analyzed by UV-Visible Spectropometer, FT-IR, and H-NMR. Based on the interpretation of spectroscopic data, the flavonoid compound isolated from rambutan bark wasflavonol group.
{"title":"Flavonoid Compound from Rambutan Bark (Nephelium lappaceum L.)","authors":"H. Br Sembiring, Mesy Jelisa","doi":"10.5220/0010139100002775","DOIUrl":"https://doi.org/10.5220/0010139100002775","url":null,"abstract":": Flavonoids included polyphenol compounds that are found in many plants which are important compounds in human food.The flavonoid group, including flavanone, flavone, dihydroflavonol, catechin, flavonol, flavan-3-ols, isoflavones, auron, anthocyanidins, proanthocyanidins and chalcones, has a general structure of C6-C3-C6. The aims of this study is to isolate and identify the group of flavonoid compound contained in rambutanbark ( Nephelium lappaceum L.). Rambutan bark powder was extracted maceration with methanol. Methanol extract was dissolved with ethyl acetate repeatedly until the solution was negative flavonoids. Ethyl acetate extract was dissolved with methanol and partitioned with n -hexane. The methanol extract which is a total of flavonoids separated by column chromatography using chloroform: methanol (90:10; 80:20 and 70:30 (v/v)). The isolates obtained were purified by preparative thin layer chromatography and producing flavonoid glycoside, yellow amorphous with Rf value of 0.25 using the chloroform: ethyl acetate eluent (50:50) v/v. The pure isolate obtained were analyzed by UV-Visible Spectropometer, FT-IR, and H-NMR. Based on the interpretation of spectroscopic data, the flavonoid compound isolated from rambutan bark wasflavonol group.","PeriodicalId":257157,"journal":{"name":"Proceedings of the 1st International MIPAnet Conference on Science and Mathematics","volume":"328 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124631056","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}
Pub Date : 1900-01-01DOI: 10.5220/0010152200002775
Junifa Layla Sihombing, .. Herlinawati, Asep Wahyu Nugraha, Ahmad Nasir Pulungan, M. Zubir, Tiamina Nasution, Ary Anggara Wibowo, S. Gea
: This research was aimed to produce biofuel fraction from rubber seed oil by using synthetic Zeolite Y (ZY), Co/ZY and CoMo/ZY catalyst. The insertion of metal used a wet impregnation method. Furthermore, in order to produce a good catalyst, the oxidation and reduction process at 500 o C using oxygen and nitrogen gases at approximately 2 hours were performed. Then, the effect of addition of ZY, Co/ZY and CoMo/ZY had been investigated at catalytic hydrocracking using metyl ester fatty acid (MEFA). The reaction was conducted at 450 o C with ratio of catalyst:feed of 1:4 and 20 mL/sec with hydrogen gas flow. Moreover, the characterization of catalyst depicted that no significant changes in wavenumber of TO4 groups and a crys-tallinity of catalyst. Then, the crystal system of ZY and Co/ZY was indicated as monoclinic while CoMo/ZY was revealed as triclinic. The surface area, pore volume and mean pore of catalysts revealed an increase trend as a result of Co and Mo impregnation. These trends have also been proven with SEM analysis which was shown an equal spreading of metals in the catalysts. Furthermore, the highest result of catalytic performance among catalysts was shown by CoMo/ZY with 59.45% of bio-gasoline. To sum up, the impregnation of Co and CoMo in Zeolit Y depicted a well-effect on its selectivity into bio-gasoline product.
{"title":"Hydrocracking of Mefa Rubber Seed Oil into Biofuels Fraction with Co and CoMo Metals Supported on Zeolite Catalyst","authors":"Junifa Layla Sihombing, .. Herlinawati, Asep Wahyu Nugraha, Ahmad Nasir Pulungan, M. Zubir, Tiamina Nasution, Ary Anggara Wibowo, S. Gea","doi":"10.5220/0010152200002775","DOIUrl":"https://doi.org/10.5220/0010152200002775","url":null,"abstract":": This research was aimed to produce biofuel fraction from rubber seed oil by using synthetic Zeolite Y (ZY), Co/ZY and CoMo/ZY catalyst. The insertion of metal used a wet impregnation method. Furthermore, in order to produce a good catalyst, the oxidation and reduction process at 500 o C using oxygen and nitrogen gases at approximately 2 hours were performed. Then, the effect of addition of ZY, Co/ZY and CoMo/ZY had been investigated at catalytic hydrocracking using metyl ester fatty acid (MEFA). The reaction was conducted at 450 o C with ratio of catalyst:feed of 1:4 and 20 mL/sec with hydrogen gas flow. Moreover, the characterization of catalyst depicted that no significant changes in wavenumber of TO4 groups and a crys-tallinity of catalyst. Then, the crystal system of ZY and Co/ZY was indicated as monoclinic while CoMo/ZY was revealed as triclinic. The surface area, pore volume and mean pore of catalysts revealed an increase trend as a result of Co and Mo impregnation. These trends have also been proven with SEM analysis which was shown an equal spreading of metals in the catalysts. Furthermore, the highest result of catalytic performance among catalysts was shown by CoMo/ZY with 59.45% of bio-gasoline. To sum up, the impregnation of Co and CoMo in Zeolit Y depicted a well-effect on its selectivity into bio-gasoline product.","PeriodicalId":257157,"journal":{"name":"Proceedings of the 1st International MIPAnet Conference on Science and Mathematics","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127914421","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}
Pub Date : 1900-01-01DOI: 10.5220/0009876300002775
Yusuf Hafidh, E. Baskoro
: The properties of graph we consider are metric dimension, partition dimension, and locating-chromatic number. Infinite graphs can have either infinite or finite dimension. Some necessary conditions for an infinite graph with finite metric dimension has been studied in 2012. Infinite graphs with finite metric dimension will also have finite partition dimension and locating-chromatic number. In this paper we find a relation between the partition dimension (locating chromatic number) of an infinite tree with the metric dimensions of its special subtree. We also show that it is possible for an infinite trees with infinite metric dimension to have finite partition dimension (locating-chromatic number).
{"title":"Infinite Trees with Finite Dimensions","authors":"Yusuf Hafidh, E. Baskoro","doi":"10.5220/0009876300002775","DOIUrl":"https://doi.org/10.5220/0009876300002775","url":null,"abstract":": The properties of graph we consider are metric dimension, partition dimension, and locating-chromatic number. Infinite graphs can have either infinite or finite dimension. Some necessary conditions for an infinite graph with finite metric dimension has been studied in 2012. Infinite graphs with finite metric dimension will also have finite partition dimension and locating-chromatic number. In this paper we find a relation between the partition dimension (locating chromatic number) of an infinite tree with the metric dimensions of its special subtree. We also show that it is possible for an infinite trees with infinite metric dimension to have finite partition dimension (locating-chromatic number).","PeriodicalId":257157,"journal":{"name":"Proceedings of the 1st International MIPAnet Conference on Science and Mathematics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126656770","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}
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