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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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Synthesis and Characterization of Cassava Shell Based Biodegradable Plastic with Kitosan Addition Supriyono Supriyono; Hamdan Hadi Kusuma; Mulyatun Mulyatun; Biaunik Niski Kumila
Journal of Natural Sciences and Mathematics Research Vol 3, No 1 (2017): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Wasted-plastic which is a hardly-decomposed material was one of the major problems of trash-recycling management in Indonesia. Replacing a common plastic with biodegradable plastic was one of the solution to reduce the amount of undecomposed-materials in the enviroment. Therefore, the aim of this resarch is to study how to synthesis cassava shell based biodegradable plastic and to analyse the effect of kitosan addition on cassava shell based biodegradable plastic properties. There are three basic characterization processes performed to analyse the sample properties, i.e mechanical test, FTIR and biodegradability test. Kitosan enhanced the mechanical and biodegradability properties of samples. The elongation-percentage decreased down to 8,57% along with the increasing the amount of kitosan concentration. FTIR data indicated the presence of O-H, N-H, C-H, C=C, NO2 and C-O organic functional group on biodegradable plastic samples. Kitosan reduce the decomposition process of samples due to its hydrophilicity. Sample with highest concentration of kitosan decomposed at the longest time up to 14 days. . ©2017 JNSMR UIN Walisongo. All rights reserved.

Preparation and Microstructure of Ag Doped on ZnO Sheilla Rully Anggita; Heri Susanto
Journal of Natural Sciences and Mathematics Research Vol 2, No 2 (2016): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Various concentration of silver (Ag) dopant on ZnO (ZnO:Ag) 2-8 mol% with solgel method were deposited on glass substrates that has been heated to a temperature of 250°C for 1h using a thermal spray coating technique and then annealed on 400C for 1h. The obtained samples were characterized by Scanning Electron Microscopy (SEM). The effect of various Ag dopant on ZnO on the microstructure are investigated. The results showed that the microstructure of ZnO:Ag are the surface of ZnO make ganglia phase with Ag grains covered the surface. The addition concentration of Ag promotes the growth of ganglia phase and grain size. The surface of ZnO:Ag ≤4 mol% the growth grain Ag is more dominant than the growth of ZnO. The dopant Ag with a concentration of 4-8mol% ganglia structure begin to form with the presence of grains. Obtained the surface of ZnO:Ag 4 mol% begins to growth ganglia phase with the largest graindiameter is 304.8 nm. ©2016 JNSMR UIN Walisongo. All rights reserved.

Effect of the Pull and Diameter String of Badminton Racket Based on Coeffisient of Restitution Value Ivan Setia Arianto; Nuri Nuri; Agus Yulianto
Journal of Natural Sciences and Mathematics Research Vol 2, No 1 (2016): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Racket and strings is an important factor in the badminton sport. The aim of this study to analyze the pull and the diameter racket string based on restitution coefficient of shuttlecock. The variation of pull was measured used racket Vinlux Miotex Power 007. Six variation of racket string are (22, 23, 24, 25, 26, and 27) lbs. The diameter of the strings has kept constant of 0.66 mm. The other variable is the diameter variation of the strings are (0.62, 0.64, 0.66, 0.68, and 0.70) mm, respectively and the pull of the strings are kept constant of 24 lbs. Based on the result, the increasing of the pull was decreased the COR value, from 0.541 to 0.374 for 22 lbs to 27 lbs, respectively. Furthermore, the similar trend for the diameter variation with the pull variation, the COR value was decreases with the increasing of the diameter, from 0.529 to 0.447 for (0.62 to 0.70) mm. We can conclude, the increases of the pull and diameter variation was decresed COR value of shuttlecock. ©2016 JNSMR UIN Walisongo. All rights reserved.

Bending Properties of Elephant Grass Fiber Reinforced Epoxy Resin Composites Alwiyah Nurhayati
Journal of Natural Sciences and Mathematics Research Vol 1, No 1 (2015): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Elephant grass fiber reinforced epoxy resin composites has been made and characterized on its mechanical properties that is bending properties. The specimen made by varying its filler’s volume fraction. The elephant grass fiber treated by immersing in water for 3 days continued by beating the strips gently in order to loosen and separate the fiber and scrapped with sharp knife and combed until individual fibers were obtained and cut uniformly in 2 cm length and 1 mm diameter width average. Hand lay up process used to prepare the composite specimens with 1%, 3% and 5% volume fraction. This method is the simplest method and require a low cost. The dimensions of the specimens used to carry out the test adapted from ASTM D 3379-75 for Bend testing. The results showed that filler volume fraction has effect to its bending strength. Specimen with 1% filler volume fraction has the highest bending stress whereas 5% filler volume fraction specimen has the highest elasticity modulus value.

The Diversity of the Dragonfly of Orthetrum Genus in Protected Area of Mount Prau, Central Java Indonesia Siti Mukhlisoh Setyawati; Puwowidodo Puwowidodo; Muh. Miftahul Huda; Bita Afriyanti Dewi
Journal of Natural Sciences and Mathematics Research Vol 3, No 1 (2017): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Dragonfly of the genus Orthetrum is a dragonfly of the Lebullidae family. This dragonfly has a variety of types of morphological structure, body color, distribution and habitat. Habitat dragonfly of the genus Orthetrum is quite extensive, especially around lowland to upland waters. Protected Forest Mount Prau Central Java, is a rainforest that has a water flow appropriate for life dragonflies. It allows the Dragonflies of all kinds to live and thrive in the environment, including Orthetrum. This research was conducted to find out the types of Orthetrum that can be found in Protected Forest Area of Mount Prau, Central Java. Determination of sampling is done along the river flow at 3 stations with total sub plot of sample as much as 12 point, starting from near settlement flow up to 2100 m toward waterfall source. The results of the sample analysis showed morphological variations in the structure of the thorax and abdomen as well as the color variations and patterns on the thorax, abdomen, and wings. Identification of the dragonfly obtained four types of dragonfly Orthetrum with variations on the sex, the male and female sabina Orthetrum, Orthetrum caffrum males. Orthetrum testaceum male, male and female pruinosum Orthetrum, and Orthetrum male and female glaucum. ©2017 JNSMR UIN Walisongo. All rights reserved.

Quality of Yeast Extract of Industry Yeast Press Alcohol waste as Drying result with Various Temperature Variation G. Maria Yusta; V. Irene Meitiniarti; E.B.E. Kristiani
Journal of Natural Sciences and Mathematics Research Vol 2, No 2 (2016): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

The content of yeast in industrial solid waste fermented beverages, has not been widely noticed and utilized, whereas many sources of nitrogen, vitamins and minerals are still present in this yeast. One of the utilization of waste yeast is processed into autolysis yeast extract. The drying process is often done using a spray dryer, but the process is costly so it is not efficient. In this study, we want to determine the temperature and drying time appropriate for maintain of yeast extract quality of yeast press. From this research, we concluded that a drying oven at 60 ° C for 6 hours is drying which does not damage the nutrient (protein, vitamine B2, carbohydrate, prolin, and lysin content) in yeast extract.©2016 JNSMR UIN Walisongo. All rights reserved.

Analysis of Angklung Sound Intensity as a Acoustic Instrument Rizka Silviana Hartanti; Budi Astuti
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 study was to analysis of angklung sound intensity. The research method is using angklung musician 2 octaves. Each consists of two tube tone that sounded from the tone of G to G ', length and diameter of the tube every tone becomes independent variable, while intensity of the sound produced becomes dependent variable. Sound intensity is measured using a Sound Level Meter is placed with a constant distance. The result showed that G tone was a low tone which had a frequency of 49.5 Hz, first tube had 21.6 cm length and 4.1 cm diameter, second tube had 10.1 cm length and 3.4 cm diameter produced the sound intensity of 90.7 dB. G’ tone was a high tone which had a frequency of 99 Hz, first tube had 10 cm length and 3 cm diameter, second tube had 5.5 cm length and 2.1 cm diameter produced the sound intensity of 99.1 dB. It can be concluded that the higher the frequency, the greater the intensity of the sound produced. The shorter tube length and the smaller tube diameter, the greater the intensity of the sound. ©2016 JNSMR UIN Walisongo. All rights reserved.

Morphological Characteristics and Kinship Relationship of Mushroom Schizophyllum commune Fr. Kusrinah Kusrinah; Rina Sri Kasiamdari
Journal of Natural Sciences and Mathematics Research Vol 1, No 2 (2015): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Schizophyllum commune is a mushroom from the division of Basidiomycota which abundance at rainy season on wood that have been moldered for its habitat. S. commune has been distributed widely at various types of wood habitat (jack fruit, bamboo, rubber, mango etc). Existence of this mushroom has not been known as well as any mushroom are able to be consumed/edible yet. In Java, the societies who have known it as consumption mushroom called it with local name jamur gigit. Jamur gigit is potential to become food material and based on organoleptic test indicates that jamur gigit is more delicious from oyster mushroom. The purpose of research is to investigate the morphology character of S. commune at various growth phases and to study the S. commune relationship in Java. The result of this research is expected can give information about morphology character of S. commune in each its growth phase and to understand S. commune relationship in Java. Sample for research has been collected in 3 areas in Java. The macroscopic morphology character and microscopic character of S. commune were observed. The character that had been obtained is used to compile description and be analyzed by cluster using SPSS 13.0 to study the kinship relationship. The result of research indicates that morphology character of S. commune in Java of fruit body when old and young phase was different, while the microscopic character almost same to the obtained sample. The result of analysis cluster indicated that at similar level of 38,1 % there were two clusters, first cluster was Sidoarjo a S. commune and S. commune Yogyakarta. The second cluster has member the Sidoarjo b S. commune, Malang S. commune, Tangerang S. commune, Semarang S. commune and Kuningan S. commune. © 2015 JNSMR UIN Walisongo. All rights reserved.

Quaternionic Version of Rotation Groups Latief Rahmawati; Muhammad Ardhi Khalif; Muhammad Farchani Rosyid
Journal of Natural Sciences and Mathematics Research Vol 1, No 1 (2015): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Quaternionic version of rotation group SO(3) has been constructed. We constructa quatenionic version of rotation operation that act to a quaternionic version of aspace coordinate vector. The computation are done for every rotation about eachcoordinate axes (x,y, and z). The rotated quaternionic space coordinate vector con-tain some unknown constants which determine the quaternionic rotation operator.By solving for that constants, we get the expression of the quaternionics versionof the rotation operator. Finally the generators of th

The Application of Music Therapy For Children with Autism Based On Facial Recognition Using Eigenface Method Hesti Khuzaimah Nurul Yusufiyah; Ilona Usuman; Agfianto Eko Putra; Triyogatama Wahyu Widodo
Journal of Natural Sciences and Mathematics Research Vol 3, No 1 (2017): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

This research is motivated by the condition of children with autism who require continuous monitoring without a parent accompany, and certain therapies who is capable to reduce repetitive behaviors and increase the concentration. Music therapy is one of the treatment which able to perform it. The implementation of this research is located in a special schools with autism, the perform is proper at certain times and requires tools for music therapy. Therefore, the integrated device was made to monitor the activities of children with autism, as well as providing music therapy automatic face recognition based on Eigenface method.This device perform when the children with autism under certain conditions (e.g. crying, the teacher would not work orders, etc.), then by capturing the the facial image, the system will process to compare the similarity with the existing database. Then, the shortest distance of euclidean is chosen. If the captured of facial image is similar to the one existing database, then the music is performed as music therapy for children with autism. The results of this system, indicates that the child's responses become more calm, easy concentration, and the repetitive attitude is reduced. While the accuracy of the system achieves by 80% (compare with the old and new database) and 20%. (without new database). ©2017 JNSMR UIN Walisongo. All rights reserved.

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Hamdan Hadi Kusuma

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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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Jawa tengah

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Contact Name Hamdan Hadi Kusuma

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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