Journal of Natural Sciences and Mathematics Research
Journal of Natural Sciences and Mathematics Research, an international journal, provides a forum for publishing the original research articles, review articles from contributors, and the novel technology news related to natural sciences and mathematics research. Scientific articles dealing with fundamental sciences, material sciences, mathematics, materials characterization, etc. are particularly welcome. The journal encompasses research articles, original research report, reviews, short communications and scientific commentaries in fundamental sciences and mathematics including: fundamental sciences, fundamental physics, fundamental chemistry, fundamental biology, mathematics, applied sciences, applied physics, applied chemistry,applied biology,applied mathematics and materials characterization.
Articles
222 Documents
<![CDATA[Antioxidant and organoleptic test of Soursop (Annona muricata Linn.) leaf tea in herbal tea production process ]]>
<![CDATA[Tria Syafa’atun]]>;
<![CDATA[Nur Marisa]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 6, No 2 (2020): December ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2020.6.2.11220
<![CDATA[Soursop leaves (Annona muricata Linn.) contain antioxidant compounds. Antioxidants are useful for protecting body cells from damage caused by free radicals. The purpose of this study was to analyze the antioxidant and organoleptic activity of soursop leaf herbal tea (Annona muricata Linn.). The antioxidant activity test used the DPPH method (2,2-diphenyil-1-picrylhydrazyl), while the organoleptic test was performed using the scoring method. The results of the study stated that the highest taste value was obtained in the 150-minute drying time sample of 2.4 and the lowest value in the 60-minute drying time sample of 2.1. The highest color was obtained in the sample drying time of 60 minutes of 3.5, while the lowest value of the sample of drying time of 150 minutes was 1.8. The highest aroma value was obtained in the 60-minute drying time sample of 3.2 and the lowest aroma value in the 120-minute drying time sample of 2.2.©2020 JNSMR UIN Walisongo. All rights reserved.]]>
<![CDATA[Analysis of Axial CT-Scan image of COVID-19 patients based in gender using the Otsu Thresholding method ]]>
<![CDATA[Melany Puspa Damayanti]]>;
<![CDATA[Heni Sumarti]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 6, No 1 (2020): June ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2020.6.1.11152
<![CDATA[At the beginning of 2020, the world was shocked by the emergence of the COVID-19 virus. This virus has spread to all corners of the world, not only in Indonesia. Therefore, the government needs to make efforts to break the chain of transmission of this virus. One of these efforts is to detect COVID-19 as early as possible. Using CT images can be one of the early detection efforts of early-phase lung infections in COVID-19 patients. The stage in detecting COVID-19 is by segmenting the image. In this study, segmentation was carried out using the Otsu Thresholding method on 8 axial CT images of the lungs of COVID-19 patients, consisting of 4 images of male patients and 4 images of female patients. Then the image segmentation results of male and female patients were compared and evaluated using ROC measurements, Threshold (T) values and analyzed for GGO (grand-glass opacity). The result can be seen that judging from the value of the ROC measurement results, the measurement of image segmentation evaluation of male patients is more accurate than female patients. The number of false negatives for male patients and female patients is the same, while the number of false positives for male patients is less than female patients. Threshold value of the image segmentation results of male and female patients is the same so that the density of image segmentation is the same. GGO (grand-glass opacity) for male COVID-19 patients aged between 45-55 years is fuller than female COVID-19 patients aged 45-55 years. This shows that men are more at risk of dying from COVID-19 than female.©2020 JNSMR UIN Walisongo. All rights reserved.]]>
<![CDATA[Analyzing causes of the death of Ferns (Pteridophyta) in the Padang Savana, Taman Nasional Bromo Tengger Semeru (TN-BTS) ]]>
<![CDATA[Eko Purnomo]]>;
<![CDATA[Nilana Izzati]]>;
<![CDATA[Robbi Mauizzatul Hikmah]]>;
<![CDATA[Diyana Sabila Rusydina]]>;
<![CDATA[Lathifah Nurul Fauzi]]>;
<![CDATA[Ibnu Sina Rafiq Romawan]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 7, No 2 (2021): December ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2021.7.2.11074
<![CDATA[The Padang Savana area of Bromo Tengger Semeru National Park (TN-BTS) is located at an altitude of 750-3676 m above sea level so that it has a high biodiversity with a distinctive vegetation character. Ferns (Pteridophyta) is one of the vegetation that dominates about 35% of the Bromo Conservation Area. The ferns in the location show a dry and dead physical condition. This study aims to analyze the causes of death of ferns (Pteridophyta) in the Padang Savana Bromo Tengger Semeru National Park. The research method used is a qualitative descriptive method and the data obtained from direct observation to the savanna of Bromo Tengger Semeru National Park (TN-BTS) and face-to-face interviews without guidance to resource persons. The sampling location is at an altitude of 2026 masl, temperature 24.4°C, air pressure 792.5 HPA, with the object of research in the form of a sprig of ferns (Pteridophyta) complete with dead leaf roots and is considered to represent all ferns (Pteridophyta) in the savanna. The data obtained from the resource persons were then analyzed using literature studies. The results showed that the death of ferns (Pteridophyta) was caused by several factors such as the presence of allelopathic substances produced from Imperata cylindrica, soil texture, and eruption disasters. Thus, the surrounding environment is very influential on the life of ferns (Pteridophyta) The results showed that the death of ferns (Pteridophyta) was caused by several factors such as the presence of allelopathic substances produced from Imperata cylindrica, soil texture, and eruption disasters. Thus, the surrounding environment is very influential on the life of ferns (Pteridophyta) The results showed that the death of ferns (Pteridophyta) was caused by several factors such as the presence of allelopathic substances produced from Imperata cylindrica, soil texture, and eruption disasters. Thus, the surrounding environment is very influential on the life of ferns (Pteridophyta). ©2021 JNSMR UIN Walisongo. All rights reserved.]]>
<![CDATA[Minimization of time distribution of ballots with Greedy algorithms in Jombang Regency ]]>
<![CDATA[Erina Seviyanti Dewi]]>;
<![CDATA[Latifah Asmaul Fauzia]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 7, No 2 (2021): December ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2021.7.1.3687
<![CDATA[Travelling Salesman Problem is a problem faced by salesmen in distributing goods by passing all points exactly once. This problem is often encountered in life, not least in the distribution of election ballots from the Komisi Pemilihan Umum Daerah (KPUD) Jombang office to the sub-district office in Jombang Regency. Proper route determination can help to minimize the travelling time between places so that the risk of delaying ballot distribution can be avoided. In determining the solution of Traveling Salesman Problem, a Hamiltonian cycle is required. The Hamiltonian cycle is a closed trail that passes every point exactly one time. The Hamilton cycle can be formed by the Greedy Algorithm. The Greedy Algorithm can quickly determine the next point based on the smallest weight in the form of distance between points. From the problem of ballot distribution in Jombang, the starting point of the route is the office of Komisi Pemilihan Umum Daerah (KPUD) Jombang then through 21 sub-district offices and back to the Komisi Pemilihan Umum Daerah (KPUD) office Jombang. Based on the searching for solutions to minimize the distribution time of ballots in Jombang Regency with Greedy Algorithm, the total distance to pass all existing sub-district offices is 253.1 km with a travel time of 427 minutes or 7 hours 7 minutes.©2021 JNSMR UIN Walisongo. All rights reserved.]]>
<![CDATA[Calculation of Tabarru Funds Using Makeham's Mortalita Law and Gompertz's Mortalita Law Using the Cost Of Insurance Method ]]>
<![CDATA[Tauki Rohman Muzaki]]>;
<![CDATA[Emy Siswanah]]>;
<![CDATA[Seftina Diyah Miasary]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 6, No 1 (2020): June ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2020.6.1.11156
<![CDATA[Tabarru funds have the meaning of a collection of funds given by insurance participants as a virtue fund with sincere intentions for the purpose of helping one participant with another if one of them gets a disaster. The tabarru fund management mechanism in Indonesia uses two types of operational systems, namely the product saving system (savings) and the non-saving product system. Management with a saving product system uses a savings mechanism with 5% for management funds. Meanwhile, in the non-saving product system with a no-savings mechanism, the amount and its management are not yet known, which will cause confusion for the community in the calculation. The cost of insurance method is one method that can be used to calculate tabarru funds. This method calculates tabarru funds by multiplying the percentage of tabarru funds by the cost of coverage. The percentage of tabarru funds is searched through the mortality table, management fee, and investment level. From the management fee of 25% and the investment rate of 5%, the percentage of tabarru funds using Makeham's mortality law is for men and for men. Meanwhile, Gompertz's law of mortality obtained for men and for women . ©2020 JNSMR UIN Walisongo. All rights reserved.]]>
<![CDATA[Synthesis of Hydrochar Cassava peels with hydrothermal carbonization method and applications as hard water softener ]]>
<![CDATA[Dzikria Sari Pratiwi]]>;
<![CDATA[Wirda Udaibah]]>;
<![CDATA[Kustomo Kustomo]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 7, No 1 (2021): June ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2021.7.1.11283
<![CDATA[Groundwater before being used is very important to pay attention to the quality of the water. Water has good quality if it is in accordance with several parameters, including chemical, physical, and biological parameters. Mineral salt content is one of the chemical parameters that can be used to determine the quality of water. In this study, the synthesis of cassava peel hydrochar was successfully carried out using the hydrothermal carbonization (HTC) method. This material was developed to reduce waste of cassava peel biomass and overcome the problem of water hardness. HTC cassava peel was developed as an alternative hard water softener adsorbent. The results of FTIR characterization on hydro-activation (activating hydrochar) and hydro-non (non-activating hydrochar) contain functional groups of O-H stretch, C-H stretch, C≡C stretch and C=C stretch. Observation of surface morphology by SEM method on hydro-non in the form of large sheets, while the surface on hydro-activities in the form of small sheets. The adsorption capacity of hydro-active against Ca2+ ions and Mg2+ ions were 85.240 mg/g and 87.210 mg/g, respectively. Meanwhile, the hydro-non adsorption capacity of Ca2+ and Mg2+ ions were 84,736 mg/g and 85,713 mg/g. The kinetics of hydro-active adsorption on Mg2+ ion took place on order 3 (0.000003 min-1) while when adsorption of Ca2+ ion took place on order 0 (0.0324 min-1).©2021 JNSMR UIN Walisongo. All rights reserved.]]>
<![CDATA[Interpretation of external quality assurance results on liver function test ]]>
<![CDATA[Rahma Widyastuti]]>;
<![CDATA[Nur Vita Purwaningsih]]>;
<![CDATA[Rinza Rahmawati Samsudin]]>;
<![CDATA[Anindita Riesti Retno Arimurti]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 6, No 2 (2020): December ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2020.6.2.11221
<![CDATA[The quality of laboratory examination results must always be guaranteed in the sense that it can provide a level of accuracy and precision that can be accounted for. Therefore, a study of External Quality Consolidation (PME) was conducted. The purpose of this study was to describe the results of External Quality Monitoring in the field of clinical chemistry parameters of Serum Glutamic Oxalocetic Transaminase (SGOT) and Serum Glutamic Pyruvic Transaminase (SGPT) at the Public Health Center Laboratory in the Surabaya area. The population in this study was a health center in the area of the Surabaya City Health Office with a sample of 15 health centers that had examinations in the field of clinical chemistry. The sample used in this study was normal level control serum which was measured on the parameters of Serum Glutamic Oxalocetic Transaminase (SGOT) and Serum Glutamic Pyruvic Oxalocetic Transaminase (SGPT). The results of data analysis showed that the percentage of PME levels of SGOT with good VIS criteria was 73.33%, sufficient criteria was 0%, less criteria was 6.67%, poor criteria was 20%. While the SGPT parameters good criteria are 53.33%, sufficient criteria are 33.33%, less criteria are 13.33%, poor criteria are 0%.©2020 JNSMR UIN Walisongo. All rights reserved.]]>
<![CDATA[The effect of Milling Time on Crystal size Sandvik Sanergy ]]>
<![CDATA[Qolby Sabrina]]>;
<![CDATA[Ahmad Afandi]]>;
<![CDATA[Nurhalis Majid]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 6, No 1 (2020): June ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2020.6.1.11153
<![CDATA[Preliminary study material sandvik sanergy as an alternative material for interconnect applications solid oxide fuel cell (SOFC) have been conducted. Sandvik sanergy was milled for 0, 8, 24, and 48 hr with ball milling planetary MTI Corp. The physical properties of small grain size can affect the strength of the alloy when applied as interconnect. In this study, ratio between ball miller and sandvik sanergy was 1:10 aiming to obtain a small grain size. Crystal size characterized by XRD Rigaku Smartlab, morphology of sandvik sanergy after milling observed using SEM Hithaci SU3500 20 kV. Diameter of particles were observed by particle size analyzer (PSA). Results showed that crystal size as well as particle size tended to decrease with the increasing milling time. Discrepancy occurred at 24 hour of milling time and showed agglomeration.©2020 JNSMR UIN Walisongo. All rights reserved.]]>
<![CDATA[The application of Seismic Coefficients in simple earthquake-resistant houses ]]>
<![CDATA[Sutrisno Sutrisno]]>;
<![CDATA[Agus Budiono]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 7, No 2 (2021): December ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2021.7.2.11271
<![CDATA[After an earthquake, reconstruction and rehabilitation are often carried out. One of them is by building a simple house. A simple house is the one built without involving construction experts, and hence it rarely follows earthquake-resistant building regulations. This study aims to determine and apply seismic coefficient in the planning of earthquake-resistant, simple houses. The seismic coefficient calculation is applied by comparing the maximum ground acceleration with gravity in cities in three provinces, namely Banten, DKI Jakarta, and West Java. From the calculation results in 21 cities in 3 provinces, the obtained seismic coefficient ranges from 0.175 to 0.411. The smallest seismic coefficient occurs in Indramayu, while the largest seismic coefficient occurs in Sukabumi. Based on the seismic coefficient, the level of earthquake risk for simple house buildings can be known. The lowest risk level occurs in Indramayu with the value of 17.5% and the highest risk level is in Sukabumi with the value of 41.1% of the standard price of a simple house building in each city. The risk level difference from one city to another can be used to strengthen and save the cost of building simple, earthquake-resistant houses.©2021 JNSMR UIN Walisongo. All rights reserved.]]>
<![CDATA[Synthesis and characterization of SO42-/KCC-1 catalyst as an alternative candidate for simultaneous esterification and transesterification reactions ]]>
<![CDATA[Ginda Putri Farikhah]]>;
<![CDATA[Wirda Udaibah]]>;
<![CDATA[Mulyatun Mulyatun]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 7, No 1 (2021): June ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2021.7.1.6797
<![CDATA[Sulfate-impregnated acid catalysts can be used to replace conventional homogeneous base catalysts which are very dangerous, corrosive and environmentally unfriendly. Sulfate impregnation on porous support material will increase the surface area of the catalyst. The use of KCC-1 as a supporting material can produce catalysts with excellent properties. The method used in this research is the hydrothermal method for the synthesis of KCC-1 and the direct impregnation method for the synthesis of SO42-/KCC-1. Characterization of the resulting material using X-ray diffraction (XRD), FTIR spectrometer, and low temperature emission scanning electron microscope (SEM). The characterization results showed that the synthesis of KCC-1 and SO42-/KCC-1 had been successfully carried out. This is evidenced by the formation of amorphous silica, the presence of peaks of silica and sulfate groups, and scanning electron microscope images showing nano-sized materials.©2021 JNSMR UIN Walisongo. All rights reserved. ]]>
