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Journal of Natural Sciences and Mathematics Research

JNSMR
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Published by Universitas Islam Negeri Walisongo Semarang

ISSN : 26146487 EISSN : 24604453 DOI : https://doi.org/10.21580/jnsmr

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Materials Science & Nanotechnology Physics

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.

Arjuna Subject : Umum - Umum

Articles 222 Documents

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Sound Absorbent And Damping Rate of The Natural Composites Design Sekarani Andari Kunthi; Baiq Siti Hawa; Firda Auliya
Journal of Natural Sciences and Mathematics Research Vol 4, No 1 (2018): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

This research was conducted to determine the sound attenuation level of composite. The composite used in this study iscompound Kalimantan sawdust and pineapple leaf fiber. The research objective was to determine the damping rate of composites (fine Kalimantan sawdust and compound of coarse Kalimantan sawdust with pineapple leaf fiber), so it can be used as an alternative sound absorbent material. The composite testing process uses a Sounds Level Meter by adjusting the frequency of the sound source. The space partition is a composite, measured the value of sound intensity at a certain distance, then given a partition, the sound intensity is again measured with the same distance. The results of the absorption coefficient of pineapple leaf fiber composite and red meranti wood sawdust can be used as an alternative sound absorbing material besides glass wool so that it can minimize side effects for public health. ©2018 JNSMR UIN Walisongo. All rights reserved.

Algorithm Hill Cipher for Securing Arabic Text Documents Ulin Nihayah; Any Muanalifah; Aini Fitriyah
Journal of Natural Sciences and Mathematics Research Vol 3, No 2 (2017): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

This research is an application of Hill Cipher cryptographic techniques in the process of encoding messages in the form of Arabic text. Hill Cipher is a classic cryptographic algorithm that uses modulo matrix and arithmetic in its application. The Arabic text used in the Hill Cipher cryptographic technique includes hijaiyyah letters ا, ب, , ي, أ, إ, ؤ, ئ, ى, ة, space , ., ،, ؟, !, and Arabic numbers 0, 1, 9, so the modulo used is . This study discusses the steps in encrypting messages with examples of their application in securing Arabic text documents.

Determining Hair Thickness using the Light Diffraction Method: Verification of the Seven Times Sliced Hair Phenomenon Ellianawati Ellianawati; Muhammad An’im Arravi; Fitria Wulandari; Rofita Istiqomah
Journal of Natural Sciences and Mathematics Research Vol 4, No 2 (2018): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Light or optical spectrum is a part of electromagnetic radiation and has several electromagnetic wave properties; one of them is undergoing diffraction. Diffraction or light bending occurred when a light went through a narrow gap. By utilizing that principle, it was proven that a piece of hair could be assumed as a single gap, so the thickness of a piece of hair could be determined, which lead to the explanation of the phenomenon of a piece of hair sliced seven times. As a tool, the used sim cardholder is used to put hair using adhesive tape. Then the sim card is placed between the light source and the screen. The light source used is a red laser with a wavelength of 660 nm. Hair is placed in two positions: horizontally and vertically. Hair that is laid horizontally will create a vertical light-dark pattern, and hair that is placed vertically will form a horizontal light-dark pattern. The dark and light patterns on the screen are measured using a ruler according to the order of each pattern that is formed. The hair thickness measurement results using a red laser with a wavelength of 660 nm obtained hair thickness of d = (0.01146 ± 0.00019) cm for hair that is placed horizontally and d = (0.01151 ± 0.00011) cm for vertically placed hair. This data has more or less proven that there is potential to "split" the hair into sections, but it has not been proven that the hair can be split into seven parts, so there is still a chance to prove it.

Synthesis of Low-Cost Adsorbent Based on Fly Ash for Heavy Metal Reduction of Cu and Cr In Textile Industrial Liquid Waste Mulyatun Mulyatun
Journal of Natural Sciences and Mathematics Research Vol 4, No 2 (2018): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Heavy metal copper (Cu (II)), Chromium (Cr (IV) is a heavy metal that dominates textile industrial wastewater. Too large concentrations of Cu (II) in water can cause poisoning which has side effects of liver damage and gastrointentinal disorders. Cr metal in the body will cause interference with DNA synthesis and increase mutagen changes that can cause tumors. The use of fly ash as a Low Cost Adsorbent is an alternative. The research method used is a physical activation process with carbonization at high temperatures (300˚C, 400˚C and 500˚C) in the furnace to be continued with chemical activation using concentrated acids (H2SO4 and CH3COOH) or base (KOH) in fly ash. Morphological analysis and the synthesized adsorbent function groups were performed using Scanning Electron Microscopes (SEM) and FTIR. Based on the adsorption capacity test, the ability of fly ash to adsorb Cu metal waste was 0.9962 mg/g and for Cr metal was 0.4760 mg/g. The temperature increase on the physical activation of fly ash (300 0C, 4000C, 5000C) causes an increase in the adsorption capacity of the synthesized fly ash. The best adsorbent for Cu metal is A5K with an adsorption capacity of 0.9994 mg/g under optimal conditions. The best adsorbent for Cr metal is A5S with an adsorption capacity of 0.9325 mg/g under optimal conditions. ©2018 JNSMR UIN Walisongo. All rights reserved.

Implementation of Micro Usb Charger TP4056 and Battery Indicator LED in Portable Solar Charge Donny Auliya Arrohman; Nafis Ainun Fikriyyah
Journal of Natural Sciences and Mathematics Research Vol 4, No 1 (2018): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Mobile is a communication tool that is needed in today's era of globalization. The source of the cellphone's power is the battery which if the power goes out and the battery runs out, it is necessary to charge the battery to turn it back on. In this study, a portable solar panel-based charger was designed as an alternative to charging batteries without using a power source. The method used is research and development where this research produces a product. The results obtained indicate that the highest intensity value at 11:00 WIB is 5986 cd, the highest current value before entering the current stabilizer and voltage amplifier circuit is 0.004 A and the highest voltage is 5 V, for the current value after entering the current stabilizer and amplifier circuit. the overall voltage value is the same, namely 0.002A and 4V. This simple portable solar cell phone charger is able to supply power to the Nokia 215 Dual SIM for 5 hours and 30 minutes. There is an LED indicator on the portable solar charger where during the charging process it will be red, then after it is full it will be blue, and when it is running out it will be orange. ©2018 JNSMR UIN Walisongo. All rights reserved.

Analysis of the Results of the Reduction of Cyanide Acid Content in Hevea brasiliensis Seeds Diah Ayu Kusuma Putri; Sulhadi Sulhadi; Teguh Darsono
Journal of Natural Sciences and Mathematics Research Vol 5, No 1 (2019): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Rubber seeds (Hevea brasiliensis) are part of rubber plants that have not been utilized optimaly. The content contained in rubber seeds is sufficient, including fat content of 68.53 g/100 g, proteins 17.41 g/100 g, and carbohydratees 6.99 g/100 g. However, the obstacle faced is the presence of toxic compounds found in rubber seeds namely cyanide acid (HCN) which is very dangerous if it enters the body. The purpose of this study is to find out the right treatment to reduce the content of cyanide acid so that the rubber seeds can be utilized. The research method uses experimental comparative. The variation used in the reduction process is to soak the rubber seeds respectively for 12, 24, and 36 hours by replacing the immersion water once every 2 hours, then boil the rubber seeds into 2 liters of water for 2 hours by replacing the boiled water for 1 hour. The results showed that the greatest decrease in cyanide acid content occurred during soaking for 36 hours with boiling for 2 hours.©2019 JNSMR UIN Walisongo. All rights reserved.

Characterization of Magnetic Properties of the Coastal Sand Deposits in South Beach of Manokwari, West Papua Sangaji Hasmi Maharani Ipa; Siti Hadjar Kubangun; Satria Bijaksana; Darharta Dahrin; Innaa Uswatun Hasanah
Journal of Natural Sciences and Mathematics Research Vol 4, No 2 (2018): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Coastal sand deposits containing iron particles (magnetic) can be regarded as iron sand and it generally has color from gray to shiny black yet while it is mixed with other minerals, the mineral will have a certain color combination. Coastal sand in the South of Manokwari Regency, West Papua especially in Wosi Beach, Arfai Beach, and Maruni Beach has a different color of the grain according to the source rocks and the sedimentation process. To characterize the magnetic properties of the three coastal sand deposits, several experimentations were done through measurements of the density, magnetic degree, magnetic susceptibility, and also SEM (Scanning Electron Microscopy) and EDS (Energy Dispersive X–Ray Spectroscopy) tests. The coastal sand deposition has a density ranging from 2.50–5.00 g cm-3 with the magnetic degree between 0.28–36.29 % and its magnetic susceptibility ranged 80.9×10-8 – 7447.7×10-8 m3 kg-1. The coastal sand from Arfai Beach has a magnetic susceptibility between the coastal sand from Wosi and Maruni Beach with the highest value reaching 5135.4 × 10-8 m3 kg-1. This is also supported by SEM and EDS data. The percentage of iron element mass (Fe) of the identified magnetic grain distribution in Wosi Beach sand is 6.71–33.90%, Arfai Beach sand is 11.35 – 38.45% and Maruni beach sand is 15.84–44.41%. ©2018 JNSMR UIN Walisongo. All rights reserved.

Synthesis of Silica from Rice Husk Ashes with Variation of Solvent (KOH) Concentration Markha Nisrinah
Journal of Natural Sciences and Mathematics Research Vol 3, No 2 (2017): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

The purpose of this experiment is to utilize natural resources as the candidate of low cost and mass production of silica and to understand the effect of KOH concentration as solvent to the phase structure of silica. The silica was prepared by sol-gel method with rice husk ashes as the raw material from natural resources. The sample was further characterized by X-Ray Diffractometer. The grain size of samples was 490,35 nm, 700,88 nm and 490,44 nm for solvent variation of 5%, 10% and 15% respectively. Those three samples contain silica (SiO2) and magnesium oxide (MgO) obtained from XRD data. ©2017 JNSMR UIN Walisongo. All rights reserved

Quality of Biocompost Resulting from Biopore Holes Based on Light Intensity and Acidity Degree (pH) Arik Pujiyanti; Sulhadi Sulhadi; Mahardika Prasetya Aji
Journal of Natural Sciences and Mathematics Research Vol 5, No 2 (2019): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

The use of chemical fertilizers that are not balanced with the provision of organic fertilizers can damage the soil. Chemical fertilizers can also damage the balance of nutrients in the soil and lower soil pH. Therefore, organic fertilizers are needed to help restore soil fertility and LRB as a medium for composting organic fertilizers. The biopore infiltration hole (LRB) is "activated" by providing organic waste. This waste will be used as a source of energy for soil organisms to carry out their activities through the decomposition process. This decomposed waste is known as compost. Compost is a term for man-made organic fertilizer made from the decomposition process of the remains of living things (plants or animals). The investigation of this study was to determine the quality of compost based on light intensity and acidity (pH) from the results of biopore infiltration holes (LRB) as well as good physical properties of compost. This type of research is an experimental research. Good quality compost has low resistance. The pH value of the compost in samples A,B,D,E is 6.5-7.5 so it is neutral, while the pH of the compost sample C is 8.5 is alkaline. The intensity of the light is high. The results of the lowest light intensity in the compost from this study were leaf compost + sawdust + EM4 of 990 lux, fermented in LRB for 2 weeks. Meanwhile, the highest light intensity value was found in the compost of raw material leaves which were fermented for 1 month at 1017 lux. So the greater the value of light intensity in the compost, the better quality it has, because it can improve soil fertility. ©2019 JNSMR UIN Walisongo. All rights reserved.

Production of Hand Washing Soap from Ethanol Extract of Fern (Pteridophyta), Nampong Leaves (Siegesbeckia orientalis) and Thistle Plants (Calotropis gigantea) Nuris Silvia; Shovi Amila
Journal of Natural Sciences and Mathematics Research Vol 5, No 1 (2019): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Soap is an ingredient that comes from natural oils or fats reacting with caustic soda in the process known as lathering or saponification. Hand washing soap from fern (Pteridophyta) as the main ingredient is one of the antiseptic soaps that will be made, by comparing the drug Spirulina to determine the level of anti-bacteria produced. This study uses a hot process method with a soap heating time of about 20 minutes and a heating temperature of around 80°C. The results of testing the quality of hand washing soap as an antiseptic that meets the test standards are organoleptic test, acidity test (pH), foam resistance level test, and skin irritation test. So it's good to use as a hand sanitizer to get rid of bacteria and germs. ©2019 JNSMR UIN Walisongo. All rights reserved.

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Journal of Natural Sciences and Mathematics Research Published by Faculty of Science and Technology Universitas Islam Negeri Walisongo Semarang Jl Prof. Dr. Hamka Kampus III Ngaliyan Semarang 50185 Website: https://journal.walisongo.ac.id/index.php/JNSMR Email:jnsmr@walisongo.ac.id

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Home Page

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Editorial Team

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Reviewer

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Contact Name Hamdan Hadi Kusuma

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Location Kota semarang, Jawa tengah INDONESIA

Abstract

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Contact Name
Hamdan Hadi Kusuma

Contact Email
jnsmr@walisongo.ac.id

Phone
-

Journal Mail Official
jnmsr@walisongo.ac.id

Location
Kota semarang,

Jawa tengah

INDONESIA