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<![CDATA[Analisis Difraksi Nanopartikel Fe3O4 Metode Kopresipitasi Dengan Polietilen Glikol 6000 ]]>
<![CDATA[Nurdin Bukit]]>;
<![CDATA[Erna Frida]]>;
<![CDATA[Pintor Simamora]]>;
<![CDATA[Tresia Sinaga]]>
<![CDATA[ PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 4 (2015): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2015 ]]>
Publisher : <![CDATA[Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI ]]>
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<![CDATA[This study aimed to obtain a particle size-based nano Fe3O4 iron sand, determine the effect of Polyethylene Glycol (PEG) -6000 with a ratio of 1: 3.1: 4,1,5 and without PEG against Fe3O4.Nanopartikel Fe3O4 nano particle size produced from iron sand which in synthetic by using coprecipitation method. Synthetic done by mixing natural sand with HCl as solvent and NH4OH as a precipitant, as templates are added PEG-6000 .Then, characterized by using X-Ray Diffractometer (XRD) to determine the crystal size and content of the phase. From the test results of X-Ray Diffractometer (XRD) to Fe3O4 without template PEG-6000 showed 29.08 nm crystal size, while Fe3O4 with the addition of PEG-6000 with a ratio of 1: 3; 1: 4; 1: 5 is: 14.90 nm; 22:16 nm; 33.11nm, the volume fraction of magnetite (Fe3O4) without PEG = 38.47%, with PEG 1: 3 = 48.39%; 1: 4 44.41%; 1: 5 = 53.20% Keywords: Nanoparticles Fe3O4, Polyethylene Glycol (PEG) -6000, Coprecipitation.]]>
<![CDATA[Processing Durian Skin Into Compost Using Enumeration Machine Technology in Sungai Raya Village ]]>
<![CDATA[Erna Frida]]>;
<![CDATA[Ferry Rahmat Astianta Bukit]]>;
<![CDATA[Achmad Husein Siregar]]>
<![CDATA[ ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 7 No. 1 (2022): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat ]]>
Publisher : <![CDATA[Talenta Publisher ]]>
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DOI: 10.32734/abdimastalenta.v7i1.6893
<![CDATA[Dairi Regency is the largest durian fruit producer in North Sumatra Province with a production of 23 thousand tons per year. One of the largest durian-producing villages in Dairi Regency is Sungai Raya Village. The estimated volume of durian skin waste produced in North Sumatra is 332,712 tons of durian skin per year, this can be seen from the large amount of durian skin waste that accumulates on the side of the road, in rivers, and farmers' gardens. Given the large volume of durian skin, it takes an effort to process durian skin waste into compost that can be used by farmers and can improve the welfare of farmers. The solution for processing durian skin is to build a community-based processing unit for processing durian skin into community-based compost by involving farmer groups. To carry out efforts to manage durian skin waste, a simple tool is needed that functions as a durian skin chopper as a basic material for compost. From the results of the durian skin counting and the dissemination of fertilizer making, farmer groups and the community have been able to make fertilizer from durian skin so that it can increase the income of the population.]]>
<![CDATA[The Effect of Size and Crumb Rubber Composition as a Filler with Compatibilizer Pp-G-Ma in Polypropylene Blends and Sir-20 Compound on Mechanical and Thermal Properties ]]>
<![CDATA[Frida, Erna]]>
<![CDATA[ Makara Journal of Technology Vol. 16, No. 2 ]]>
Publisher : <![CDATA[UI Scholars Hub ]]>
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<![CDATA[Having been researched the development of thermoplastic elastomer material of polypropylene and natural rubber SIR- 20 compound with Crumb Rubber as the filler. Reinforced polypropylene with size 60 mesh with 1 mm, and the composition of the Crumb rubber (30, 40, and 50) wt%. Observed mechanical properties are tensile strength, fracture elongation, Young's modulus, tear strength and impact strength. Thermal properties are analyzed by DSC and DTA/TGA. It is acquired that for the size of 60 mesh crumb rubber tensile strength, fracture elongation, Young’s modulus, tear strength and impact strength are bigger than 1mm size. The addition of 60 mesh crumb rubber increases but it decreases by adding of 50 weight%. While for crumb rubber 1 mm tensile strength, fracture elongation, tear strength and impact strength decreas. Based on analysis of DSC that the addition of crumb rubber does not make a difference boiling point significantly between samples containing crumb rubber and polypropylene Analysis TGA/DTA to an increase in enthalpy and decomposition temperature with the addition of crumb rubber used and thermal stability.]]>
<![CDATA[The Effect Zeolite Addition in Natural Rubber Polypropylene Composite on Mechanical, Structure, and Thermal Characteristics ]]>
<![CDATA[Bukit, Nurdin]]>;
<![CDATA[Frida, Erna]]>
<![CDATA[ Makara Journal of Technology Vol. 17, No. 3 ]]>
Publisher : <![CDATA[UI Scholars Hub ]]>
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<![CDATA[This study was conducted to determine the effect of zeolite as filler on mechanical properties, and thermal structure blends of natural rubber and polypropylene (NR/PP). In this study, NR/PP/PP-g-MA blends was filled uncalcined zeolite and calcined zeolite at different weight percent of the 2, 4, and 6%. Samples were characterized to determine the tensile strength, fracture elongation and Young's modulus. Structure of the samples was investigated using XRD method and thermal characteristics were analyzed using DTA/TGA technique. The results obtained for tensile strength showed a significant influence with the addition zeolite of the NR/PP blends at 2% by weight of the composition (8 MPa) and decreased with increasing zeolite composition uncalcined zeolite or calcined zeolite. At 2% to 6% by weight of an increase in Young's modulus, for which uncalcined zeolite function more effectively than the calcined zeolite. On the other hand, the addition of uncalcined zeolite and calcined zeolite did not result in decreased fracture elongation. The XRD analysis zeolite indicate the existence of amorphous phase and crystalline mineral type mordenite (CaAl2Si10O24.7 H2O). In general, cristality of samples filled with calcined zeolite slightly higher than the uncalcined zeolite at the same amount and intercalation occurs between the zeolite matrix NR/PP. Thermal analysis showed that the samples are filled with calcined zeolite has a thermal resistance higher than the uncalcined zeolite, the melting point NR/PP 165.0 °C with the addition of 6 wt% zeolite melting point to 186.7 °C.]]>
<![CDATA[Projection of Tourist Climate Comfort Level Period 2031-2050 in Caldera Toba Geopark ]]>
<![CDATA[Alfonsius Chrisandy Pratama Siregar]]>;
<![CDATA[Erna Frida]]>;
<![CDATA[Marzuki Sinambela]]>;
<![CDATA[Marhaposan Situmorang]]>;
<![CDATA[Syahrul Humaidi]]>;
<![CDATA[Yahya Darmawan]]>
<![CDATA[ Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol 11, No 2: April 2023 ]]>
Publisher : <![CDATA[IKIP Mataram ]]>
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DOI: 10.33394/j-ps.v11i2.7756
<![CDATA[Tourism is one of the economic sectors that is developing relatively rapidly and has the potential to become a source of foreign exchange due to an increase in the number of tourists. Caldera Toba Geopark is one of the UNESCO-owned Geoparks in Indonesia as a tourist destination that depends on natural potential to be vulnerable to climate change. The relationship between climate and tourism from the comfort index is needed in determining tourist comfort. Climate parameters that become the calculation of the climate comfort index such as air temperature, rainfall, wind speed, length of sunshine and cloud cover are part of the thermal, physical and aesthetic aspects of climate comfort weighting. Climate projection data in this study is the RCP 4.5 scenario with the ACCESS 1-3 model. Using the TCI and HCI methods, the results of the temporal pattern analysis on the climate comfort index for the period 2031-2050 have a 'Bimodal - Shoulder Peak' distribution pattern. Based on the results of the spatial pattern analysis, the level of tourist climate comfort for the period 2031-2050 both with TCI and HCI methods is dominated by the comfortable category index where the peak comfort occurs in December with a very comfortable category. The lowest comfort level with the TCI method occurs in June in the comfortable category, while the HCI method in July with a comfortable category. In the end, the results of this study provide recommendations for the best tourist time in the Caldera Toba Geopark from September to December. The recommended geosite locations are Simanindo - Batu Hoda and Hutatinggi - Sidihoni geosites.]]>
<![CDATA[Study of the Utilization of WRF Model Output Data to Produce Daily Flood Forecast Maps in the North Sumatra Region ]]>
<![CDATA[Mega Sirait]]>;
<![CDATA[Syahrul Humaidi]]>;
<![CDATA[Marzuki Sinambela]]>;
<![CDATA[Marhaposan Situmorang]]>;
<![CDATA[Erna Frida]]>
<![CDATA[ Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol 11, No 2: April 2023 ]]>
Publisher : <![CDATA[IKIP Mataram ]]>
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DOI: 10.33394/j-ps.v11i2.7735
<![CDATA[Flood is a natural disaster that often occurs in Indonesia. Currently, flood events are relatively difficult to predict because floods generally occur suddenly in uncertain periods. Extreme rainfall is a major factor for the occurrence of floods. Considering that floods can be caused by heavy rainfall events within a few hours, it is necessary to produce daily flood forecasts for flood disaster mitigation. This study aims to test the accuracy of utilizing rainfall forecast data from the Weather Research and Forecasting (WRF) model to create daily flood forecast maps. The data used in this study include Global Forecast System (GFS) data, BMKG rainfall measurement data which spread across several points in North Sumatra Province, and flood incident reports from BNPB. Data processing is carried out by Geospatial Information System (GIS) using Quantum-GIS, which includes weighting and scoring the parameters of soil type, slope, land elevation, river density, and land cover to produce Flood Prone Maps, then integrated with rainfall data to produce Daily Flood Forecast Maps. The case studies of flood events in this study are August 28 and November 28, 2022. The results showed that the spatial forecast of flood potential (WRF) has a pattern in accordance with the flood event area. Therefore, the WRF model output rainfall prediction data can be used to create a daily flood forecast map in the North Sumatra region.]]>
<![CDATA[Projection of Climate Change on the Probability of Dengue Hemorrhagic Fever in North Sumatra Province ]]>
<![CDATA[Theresia Grefyolin Simbolon]]>;
<![CDATA[Erna Frida]]>;
<![CDATA[Marzuki Sinambela]]>;
<![CDATA[Marhaposan Situmorang]]>;
<![CDATA[Syahrul Humaidi]]>;
<![CDATA[Yahya Darmawan]]>
<![CDATA[ Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol 11, No 2: April 2023 ]]>
Publisher : <![CDATA[IKIP Mataram ]]>
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DOI: 10.33394/j-ps.v11i2.7754
<![CDATA[Climate change is a major threat to global prosperity. The industrial revolution has occurred since 1750 to 2010 where the increase in global air temperature has reached 0.7°C. Rising temperatures and fluctuating rainfall is the identification of climate change, one of the impacts of climate change is changing the distribution of some types of mosquitoes (Aedes Aegypti).Based on the results of the analysis of the main components, a good model uses an accuracy rate of about 85% and passes the test individually and as a whole. Indonesia has a tropical climate where warm temperatures and high rainfall variability are a comfortable habitat for Aedes Aegypti mosquitoes. The breeding and life cycle of the Aedes Aegypti mosquito is directly influenced by climatic conditions. The purpose of this study is to determine the normal rainfall map, an overview of climate projection patterns, identification of characteristics of climate change in the short term (2011 – 2040), medium term (2041 – 2070) and long term (2071-2100) based on rainfall and temperature projections in North Sumatra province. Statistical methods used to determine the effect of climate on health (dengue) include statistical downscaling, delta bias correction, Principal Component Analysis, and ordinal logistic regression. The results of the ordinal logistic regression analysis show that rainfall that is suitable for dengue fever ranges from 100 - 300 mm. For North Sumatra rainfall ranges from 50 - 600 mm. In March and November is the strongest threat because of the peak with high rainfall intensity where the danger of flooding and dengue. The air temperature ranges from 24.5 - 28.5 oC, this condition is still optimal for the development of the Aedes Aegypti mosquito. The climate change projection index for the short term (2011 - 2040), medium term (2041 - 2070) and long term (2071 - 2100) shows a consistent increase with a range of 0.40C, this value will affect the acceleration of the reproduction of the Aedes aegypti mosquito as the cause of DHF. The projection probability of dengue hemorrhagic fever shows that North Sumatra Province still has a high chance of being categorized as a high risk area for dengue fever with a probability value of 0.82 - 0.99.]]>
<![CDATA[The Effect of Sorbitol on the Mechanical Properties of Temu Ireng Rhizomes (Curcuma Aeruginosa Roxb.) Starch Biodegradable Plastic ]]>
<![CDATA[Santy Meilisa Manurung]]>;
<![CDATA[Erna Frida]]>;
<![CDATA[Susilawati Susilawati]]>;
<![CDATA[Syahrul Humaidi]]>;
<![CDATA[Perdinand Sinuhaji]]>
<![CDATA[ Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol 11, No 2: April 2023 ]]>
Publisher : <![CDATA[IKIP Mataram ]]>
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DOI: 10.33394/j-ps.v11i2.7831
<![CDATA[Biodegradable plastic is made by mixing from temu ireng rhizomes starch matrix, sorbitol as a plasticizer, and chitosan as a filler through the melt intercalation method. heating process at 800C and drying at 70oC. The results show that the addition of chitosan and sorbitol has an effect on the characteristics of the plastic. The best tensile strength results on biodegradable plastic with a mass composition of starch: chitosan 5:5 gram without the addition of sorbitol is 4.03 MPa. The best percentage of elongation in plastic with a composition of starch: chitosan 8:2 gr and 3 ml Sorbitol is 99.68%. The best water resistance to biodegradable plastic was the composition of starch: chitosan 5:5 gr without the addition of sorbitol is 83.33%. And the best biodegradability in plastic with a composition of 5:5 chitosan without the addition of sorbitol was 100% for 9 days. FTIR test results show that biodegradable plastic have the same wavelength as their constituent raw materials. This shows that the resulting film only interacts physically.]]>
<![CDATA[The Effect of Different Liquid on Temperature Uniformity and Stability in Microbath 7102 ]]>
<![CDATA[Waslina Rangkuti]]>;
<![CDATA[Kerista Tarigan]]>;
<![CDATA[Syahrul Humaidi]]>;
<![CDATA[Marhaposan Situmorang]]>;
<![CDATA[Erna Frida]]>;
<![CDATA[Yahya Darmawan]]>
<![CDATA[ Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol 11, No 2: April 2023 ]]>
Publisher : <![CDATA[IKIP Mataram ]]>
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DOI: 10.33394/j-ps.v11i2.7842
<![CDATA[Microbath Fluke Type 7102 is used for thermometer calibration. In the calibration process, Microbath uses liquid media as heat conductor. Liquid media in Microbath during the calibration process there is a value of uniformity and temperature stability. The value of temperature uniformity and stability is an influential component in determining the value of measurement uncertainty (U95). The smaller the U95 value, the better the calibration results. This is a factor in this study to analyse the uniformity and temperature stability of liquid types of Water, Methanol and Glycol. The uniformity test method is carried out using 5 (five) point measurements, where the reference point is in the middle. The stability test method uses the measurement of one reference point. Uniformity and stability values are connected to determine the uncertainty of measurement value using the GUM (Guide to the expression of Uncertainty in Measurement) method. The analysis showed that Methanol is more homogeneous than Glycol and Water, with values of 0.0855 ºC < 0.0942 ºC < 0.1030 ºC. Water is more stable than Methanol and Glycol, with values of 0.0021 ºC < 0.0027 ºC < 0.0028 ºC. The time to stabilise Methanol is better than Water and Glycol. Methanol can be stabilised with ± 35 - 40 minutes, Water needs ± 38 - 40 minutes and Glycol needs ± 48 - 50 minutes. The relationship between uniformity and temperature stability is that the smaller the uniformity and stability values, the smaller the U95 of a calibration result. The U95 value of Methanol 0.11 ºC, Glycol 0.12 ºC and Water is 0.13 ºC.]]>
<![CDATA[Extraction and Characterization of Nanocrystalline Cellulose from Sugar Palm Fibres (Arenga Pinnata) ]]>
<![CDATA[Sally Irvina Ritonga]]>;
<![CDATA[Erna Frida]]>;
<![CDATA[Syahrul Humaidi]]>
<![CDATA[ Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol 11, No 2: April 2023 ]]>
Publisher : <![CDATA[IKIP Mataram ]]>
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DOI: 10.33394/j-ps.v11i2.7935
<![CDATA[In this work, cellulose was isolated from sugar palm fibre (Arenga pinnata) and converted into sugar palm fibre nanocrystalline cellulose (NCCs) in the hamlet of Medan Sinembah, Indonesia. Alkalization and bleaching were the stages of the therapy process. The cellulose removed with 30 weight percent concentrated sulfuric acid was then used to isolate NCC. Using Fourier transform infrared spectroscopy (FT-IR), the chemical make-up of sugar palm fibre and NCCs was identified. On the basis of structural analysis, X-ray diffraction (XRD) was used. Scanning electron microscopy (SEM) was used for morphological examination, while transmission electron microscopy (TEM) was used to look into NCCs. The outcomes demonstrated that the extracted cellulose underwent bleaching and alkalization processes, respectively, to eliminate lignin and hemicellulose. The diameters of the sugar palm fibre and NCCs were determined 69.025 µm to 6.07±0.14 nm and, respectively]]>
