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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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Classical Cryptography of Wind's Eye Cell Circles Razis Aji Saputro; Risti Sokawati; Mudrikah Mudrikah; Nikken Prima Puspita
Journal of Natural Sciences and Mathematics Research Vol 2, No 2 (2016): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

This classic cryptographic algorithms was designed from the concept of cardinal directions and the S-box. circles Concept given 16 directions winds and 8 circles lined with each cells according to ASCII table. The process of encryption algorithm using two kinds of key symbol that are (k1) form 16 symbols of the wind, and (k2) is a 7-bit binary number. plaintext encryption process become chiperteks1 with forming angle against north wind and k1 roomates are from plaintext rotating accordance angle formed. Chipertext 1 to chipertext 2 using binary numbers divided become r1 as directions displacement away from the center circle and r2 move with rotating around the center circle. Spinning process followed directions clockwise circle if even if odd and vice versa. Decryption process is done by doing a backward on the algorithm by using the key k2 (r2 then r1) and then r1. Spins counter-encryption process. ©2016 JNSMR UIN Walisongo. All rights reserved.

Influence Analysis of Heating Time Towards Degradation of Anti Oxidant Activity on Water Spinach Leaves (Ipomoea Aquatica Forsk) Akhmad Baihaqi Arsyad; Ratih Rizqi Nirwana; R. Arizal Firmansyah
Journal of Natural Sciences and Mathematics Research Vol 2, No 1 (2016): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

The purpose of this research is to analyze the impact of water spinach leaves heating (Ipomoea aquatica Forsk) at 100oC by different time duration on its antioxidant activity. The method was experimental method involved several steps, such as sample preparation, extraction process, and evaluation of antioxidant activity with UV-Visible Spectrophotometer. The result of this research shown that IC50 value from K1, K2, K3 to K4 were 25.25 μg/mL (very high), 96.75 μg/mL (high), 181.47μg/L (low, and 280μg/mL (very low). The IC50 value of K1 to K2 decreased 71.49 μg/L, The K2 to K3 decreased 84.72 μg/L, K3 to K4 decreased 98.53 μg/L. By this result, it was predicted that the antioxidant of water spinach will diminish, or even it will be lowered when it is steamed more than 15 minutes in 100 C. ©2016 JNSMR UIN Walisongo. All rights reserved.

Characteristics of Coconut Coir Composite Acoustic with Epoxy Matrix Lia Solikhatul Amalia; Andi Fadllan; Abdul Wahib
Journal of Natural Sciences and Mathematics Research Vol 1, No 2 (2015): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

The aim of this research is to measure the absorption coefficient of composite material synthesized from coconut fiber as filler and epoxy matrix and to discover the alternative interval of sound reducer material from natural resources, i.e (coconut fiber : fine fiber, rough fiber and crude fiber). After pressing, the sample was then cutted and examined using Bruel and Kjaer characterization. From the characterization process, the absorption coefficient of composite with filler of fine, rough and crude coconut fiber is calculated and found to be 0.997, 0.97 and 0.96, respectively. © 2015 JNSMR UIN Walisongo. All rights reserved.

CHARACTERIZATION OF PROPERTIES OF PVDF/POLY(DIMETHYLSILOXANE) COMPOSITES SEPARATOR WITH BLENDING MEMBRANE METHOD Devi Eka Septiyani Arifin
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 aims of this research to make poly(vinylidene fluoride) (PVDF) and poly(dimetilsiloksan) (PDMS) composites separator with blending membrane method. Synthesized of PVDF/PDMS composites separator used various ratio were 10/0, 9/1, 8/2, and 7/3. The purpose of increasing concentration of PDMS/PVDF to improve the performance of the composites separator which includes a dimensions of porosity, a pore density, and a electrical conductivity. Based on crystallographic analysis using XRD, the increasing concentration number of PDMS to make compositess was influence decreasing of crystallinity until 29.26% in a ratio 7/3.The analysing of FTIR have sound the wavenumber of each phase can distinguish, which this material includes in the criteria of the composites. The result using XRD and FTIR to material PVDF/PDMS composites in all of the ratio constituens have shown the identification of the structure α-phase of PVDF. The increase of concentration number PDMS influenced decreasing of pore dimension and increasing of pore density with the small of pore dimension 1.71 µm and pore density 4.07x1011 count/m2 inthe ratio 7/3. In a ratio 7/3, the value of the electrical conductivity was 3.45x10-4S/cm and the resistance increased up to 80%.

Eigen Value of Fuzzy Matrices Suroto Suroto; Ari Wardayanti
Journal of Natural Sciences and Mathematics Research Vol 2, No 2 (2016): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

In this paper we discuss about eigen value of fuzzy matrices by adopted the substract operation of fuzzy matrices in Sidky and Emam (1992). By applying this substraction, it’s yields that some properties eigen value of fuzzy matrices in Joe Anand and Edal Anand is not satisfied.©2016 JNSMR UIN Walisongo. All rights reserved.

Photochemical Property of Ethyl Acetate of Salam Stem Cortex (Syzygium polyanthum) M Najib; R. Arizal Firmansyah; Siti Mukhlisoh Setyawati
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 understand the photochemical property of ethyl acetate extracted from Salam Stem Cortex (Syzygium polyanthum). The electrochemical test of the sample indicated the existence of secondary metabolic compound, i.e flavonoid, alkaloid, steroid, tannin, fenolat and terpenoid. The secondary metabolic compound was mostly beneficial for pharmacology as a herbal medicine.

Kentong Damping Sound Intensity Level Based on Kentongan Length Variations Ellianawati Ellianawati; Muhammad An’im Arravi; Fitria Wulandari; Rofita Istiqomah
Journal of Natural Sciences and Mathematics Research Vol 5, No 2 (2019): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

This study aims to determine the attenuation of the sound produced by a Kentongan musical instrument based on variations in the length of the Kentongan. Data were collected in a quiet room by starting to measure the noise and atmosphere of the room. This study used Sound Meter Software with version 3.4.5 with a maximum sound intensity limit of ~ 90 dB, mobile as an intermediary. This study used Kentongan with a length of 1, 29 cm and a length of 2 that was 34.1 cm. Experiments were carried out 3 times with the first experiment without Kentongan, then Kentongan 1 and then Kentongan 2. The sound intensity produced by without Kentongan is an average of 60.08 dB, then with Kentongan 1 that is, with an average of 61.86 dB, and Kentongan 2 with an average of 56.68 dB. ©2019 JNSMR UIN Walisongo. All rights reserved.

Measurement of Friction Coefficient between Glass and Rubik's Beam on the Sloping Field using Rubik Lubricant Try Adi Sucipto
Journal of Natural Sciences and Mathematics Research Vol 5, No 1 (2019): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

This research is based on a rubik game involving the coefficient of friction. Rubik when difficult to rotate then the coefficient of friction is large. Rubik has several lubricants including Maru Lube, Ellips, and Kit Shampoo. This study aims to determine friction coefficient between the inclined plane of glass and rubik beams with lubricating. The beam is launched on an inclined plane and measured travel time. The results of the measurement of the coefficient of friction of the three lubricants namely Maru Lube lubricant has a coefficient of friction value of 0.4586, Ellips lubricant of 0.4375, and shampoo Kit lubricant of 0.4630. Based on these data it can be concluded that Ellips lubricant is the most slippery and more effective lubricant to use.

Behavior Study of Periophthalmus variabilis and Boleophthalmus boddarti Saifullah Hidayat
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 Gelodok fish (Mudskipper) which is called as amphibious fish have unique activity that can live in terrestrial and aquatic area. This study aims to study the daily activities of fish population 2 types of Periophthalmus variabilis and Boleophthalmus boddarti by using the scan sampling method and ad libitum. This research was conducted in September 2017 at the mouth of the river Tluwuk, Pati, Central Java. Observations were made for 150 minutes with a time interval of 5 minutes. The results showed that fish activity P. variabilis (v) was different from B. Boddarti (b). P. varibilis spends more time on land (90%) than in water (10%) whereas B. Boddarti activity is more in water (60%) than in land (40%). Observed activities are walking (a = 24,08 %., b = 11,73% ), jumping (a = 4.01%, b = 0.65%), feeding / catching prey (a = 5,01%, b = 7.82%), swimming (a = 2.01%, b = 11.72%), moving dorsal fins (a = 4.01%, b = 3.26%), moving caudal fins (a = 2 , A = 2.67%, b = 7.82%), escape predators (a = 3.34%, b = 6.51%), head movements (a = 4.01%, b = 15.63%), entering holes/nesting (a = 0.67%, b = 1.95%), and inactive (a = 40.13%, b = 19 , 54%).

Measurement of Moment of Inertia Through a Bifilar Pendulum Swing Based on a Microcontroller Niken Tri Widayati; Nadia Wahyu Lurinda; Hartono Hartono; Supriyadi Supriyadi
Journal of Natural Sciences and Mathematics Research Vol 5, No 2 (2019): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Every object has a tendency to maintain its state of motion. The concept also applies to rotating objects called moments of inertia. This experiment aims to explain the working principle and determine the magnitude of the moment of inertia of objects using a bifilar pendulum teaching aid based on the ATMEGA-16 microcontroller. The implementation method used is the experimental method. The working principle of the ATMEGA-16 bifilar pendulum microcontroller-based teaching aids uses the bifilar pendulum principle. The moment of inertia of an object can be measured using a measuring tool that works at the moment of the inertia oscillation method. The bifilar pendulum experiment consists of an object which is tied on either side by a rope and then attached to a support. Objects are deviated horizontally with a small angle to the equilibrium position and then released, the object will experience periodic oscillations. Based on the experimental results the shorter the distance of the two bifilars, the period will be even greater, and vice versa. The magnitude of the period (T) on the bifilar pendulum is inversely proportional to the root distance between the two bifilar (d). The results of experiments carried out for variations in rope length and the distance between the ropes. The moment of inertia based on experiments for variations in length of rope at 0.35 m is (I ± ΔI) = kg/m2 ; 0.45 m is (I ± ΔI) = kg/m2 ; 0.55 m then (I ± ΔI) = kg/m2 ; 0.65 m then (I ± ΔI) = kg/m2 and 0.75 m, (I ± ΔI) = kg/m2.. Furthermore, the moment of inertia is based on experiments for variations in the distance between the ropes at 0.1 m then (I ± ∆I) = kg/m2; 0.15 m then (I ± ∆ I) = kg/m2; 0.20 m then (I ± ∆I) = kg/m2; and 0.25 m then (I ± ∆I) = kg/m2. The experimental results show that the smaller the distance between the two ropes will produce conformity to the theory of the solid cylinder using the shaft approach through the center.©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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Contact Name Hamdan Hadi Kusuma

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Location Kota semarang, Jawa tengah INDONESIA

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Contact Name
Hamdan Hadi Kusuma

Contact Email
jnsmr@walisongo.ac.id

Phone
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Journal Mail Official
jnmsr@walisongo.ac.id

Location
Kota semarang,

Jawa tengah

INDONESIA