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INDONESIA
JOURNAL OF NATURAL SCIENCES AND MATHEMATICS RESEARCH
Published by Universitas Islam Negeri Walisongo Semarang
ISSN : 24604453     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
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 : -
Articles 8 Documents
 1 
X-Ray Diffraction and Density Distribution Measurements on the Al2O3 Crystals Grown by Czochralski Method with Different Pull Rate Kusuma, Hamdan Hadi
JOURNAL OF NATURAL SCIENCES AND MATHEMATICS RESEARCH 2015: JNSMR Volume 1 Issue 1 Year 2015
Publisher : Fakultas Ilmu Tarbiyah dan Keguruan, UIN Walisongo

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Abstract

The Al2O3 crystal has been done by Czochralki Method with different pull rate. The effect of pull rate on the Al2O3 single crystal was characterized using X-ray diffraction and density measurement. Base on the XRD result The Al2O3 crystal, which belongs to the hexagonal system, except for the difference in the relative intensity, present diffraction data which are found to be in good agreement with those of the powder diffraction file (PDF) 43-1484 provided by the JCPDS. It was observed the structure with symmetry group D63d–R3C and has lattice constants being a = 4.759 Å, c = 12.99 Å. The density of the crystals increased with the pull rate. This phenomenon is caused by the speed of the pull rate crystal that causes changes in the heat flow in the furnace and then changed homogeneities of species distribution of atoms along the crystal
Growth of nanocrystalline α-SiC films on Si(100) and SiO2/Si Substrate using Monomethilsilane Single Source by Hot Mesh-CVD Astuti, Budi
JOURNAL OF NATURAL SCIENCES AND MATHEMATICS RESEARCH 2015: JNSMR Volume 1 Issue 1 Year 2015
Publisher : Fakultas Ilmu Tarbiyah dan Keguruan, UIN Walisongo

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Abstract

Growth of nanocrystalline α-SiC film on  Si(100) substrates was carried out using a home-made hot-mesh chemical vapor deposition (hot-mesh CVD) apparatus. Monomethylsilane (MMS) was used as single source gas while hydrogen (H2) as carrier gas. The growth parameter in this experiment are as follow: H2 flow rate 112 sccm, gas feed ratio (H2/MMS) 172 – 345, total gas pressure during growth 120 – 750 Pa, substrate temperature 500 °C, W-mesh wire temperature 1800 °C and distance between substrate and W-mesh wire 30 mm. The structural properties of the films were analyzed using scanning electron microscopy (SEM) and x-ray diffraction (XRD). For the composition element of the film was investigated using energy dispersive x-ray spectroscopy (EDX). The surface morphology of the silicon and SiO2/Si wafer was shown similar form i.e. smooth surface without any form of the particle and any defect. Based on the XRD result shows the peak of α-SiC(100) was observed around 2θ = 33°. Furthermore, according to the EDX characterize, the mass percentage of the carbon and silicon element of the films grown on Si(100) and SiO2/Si(100) are 1,65 and 78.54 for films on carbon and 1.85 and 89.56 for silicon, respectively. We can assume the composition value of the Si is not only from the films is formed but also from the Si substrate.
Simulation Nongravitational Dynamics of Cometary Orbit -, Arsini; Saefan, Joko; Rosyid, Muhammad Farchani
JOURNAL OF NATURAL SCIENCES AND MATHEMATICS RESEARCH 2015: JNSMR Volume 1 Issue 1 Year 2015
Publisher : Fakultas Ilmu Tarbiyah dan Keguruan, UIN Walisongo

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Abstract

The tail formation of a comet near the sun leads to the situation in which the comet continually losses a part of its masses so that the mass of the comet decreases monotonically.  A comet may also accrete the material encountered along its orbit so that its mass increases. Therefore, the mass of a comet can be regarded as a function of time. In this work we study simulation the dynamics of the orbit of a comet due to the lost of its mass along the formation of its tail and the material accretion along its orbit. It is assumed  that the comet under consideration is of the form of a ball and rotates so rapidly that the whole ow its surface catches the radiation of the sun equally.
Quaternionic Version of Rotation Groups and Lorentz Group Rahmawati, Latief; Khalif, Muhammad Ardhi; Rosyid, Muhammad Farchani
JOURNAL OF NATURAL SCIENCES AND MATHEMATICS RESEARCH 2015: JNSMR Volume 1 Issue 1 Year 2015
Publisher : Fakultas Ilmu Tarbiyah dan Keguruan, UIN Walisongo

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Abstract

Quaternionic version of rotation groups and Lorentz Group has been constructed. The rotation groups that has been discussed were quaternionic version of groups , O(3), and SO(3). The Lorentz groups that has been discussed were quaternionic version of groups SL(2;C), O(3; 1), and SOo(3; 1). Starting from the definition of each group, the parameters of the group were obtained. Finally the generators of the group were obtained. The commutation of the generator were also computed. 
Anatomical Respons of Ajwa Dates Sprouts (Phoenix dactylifera L.) to Water Availabiity and Light Intensity Armanda, Dian Triastari
JOURNAL OF NATURAL SCIENCES AND MATHEMATICS RESEARCH 2015: JNSMR Volume 1 Issue 1 Year 2015
Publisher : Fakultas Ilmu Tarbiyah dan Keguruan, UIN Walisongo

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Abstract

The biggest moslem population in the world Indonesia still has high dependency on importing date palms from another country. Ajwa dates (Phoenix dactylifera L.) is one of special date palm cultivar which  had cultivated since 5000 BC in arid climate area in Saudi Arabia/Al-Madinah Al-Monwarah. Adaptation and optimation of environmental factors for Ajwa dates cultivation in Indonesia important to be conducted to meet the date palm demand of this country.This papers is a study on anatomical responses of Ajwa dates sprouts to water availibility and light intensity has been conducted. Ajwa date sprouts has been exposed to three shade variations (without shade, 50% shade, and 90% shade) and four water availibility variations (25%, 50%, 75%, dan 100% of the field capacity). Data taken from day 0 until 45th day of germination. Morphological parameters which observed and analyzed were the length of the leaf blade and the sprouts root length. Anatomical parameters which observed  and analyzed were the radius of the root, the stele diameter, number of leaves, leaf thickness, and stomatal diameter. Variations on water availibility and light intensity gives the same effect (not significantly different), consequently the most optimal variation treatment was unknown. Advanced research need to be conducted to gain more complete information regarding the optimization of environmental factors for the cultivation of Ajwa date.
Analisis Aspek Molekuler Biomarka Alkana Bercabang Core Badak 1/208 Muara Badak, Kutai Kartanegara, Kalimantan Timur Firmansyah, R. Arizal; Burhan, R.Y. Perry
JOURNAL OF NATURAL SCIENCES AND MATHEMATICS RESEARCH 2015: JNSMR Volume 1 Issue 1 Year 2015
Publisher : Fakultas Ilmu Tarbiyah dan Keguruan, UIN Walisongo

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Abstract

Kajian senyawa biomarka alkana bercabang pada core Badak 1/208 telah dilakukan untuk memberikan kontribusi pada kegiatan eksplorasi minyak di sumur Badak 1/208 Muara Badak, Kutai kartanegara-Kalimantan Timur melalui profil biomarka core alkana bercabang. Sampel core diekstraksi secara berselang seling dengan campuran pelarut toluena-metanol (3:1) dan kloroform-metanol (3:1). Kemudian difraksinasi dengan metode Kromatografi Kolom dan Kromatografi Lapis Tipis untuk memperoleh fraksi hidrokarbon alifatik. Fraksi yang diperoleh diidentifikasi menggunakan Kromatografi Gas-Spektrometri Massa. Kandungan biomarka fraksi hidrokarbon alifatik yang teridentifikasi antara lain iso dan anteiso alkana, mono dan trimetil alkana. Adanya senyawa iso- dan anteiso alkana, serta alkil alkana lainnya, memberikan informasi bahwa sumber bahan organik sampel core I dan II berasal dari mikroorganisme prokariotik atau biogenik prekusornya berasal dari sianobakteri (mikroorganisme laut) dan homolog monometil alkana yang terdapat pada sampel core II lebih mendekati seri homolog monometil alkana yang terdapat pada sedimen dan minyak zaman Proterozoic dan Precambrian, sehingga dapat dikatakan bahwa sampel core II lebih tua daripada sampel core I
The Effect of Vanadium Oxide on The Catalytic Activity of Titanium Silicalite in Conversion of Benzene to Phenol -, Mulyatun
JOURNAL OF NATURAL SCIENCES AND MATHEMATICS RESEARCH 2015: JNSMR Volume 1 Issue 1 Year 2015
Publisher : Fakultas Ilmu Tarbiyah dan Keguruan, UIN Walisongo

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Abstract

Phenol is one of the most important intermediate for petrochemical, agrochemical, and plastics industries. Almost 95% phenol is produced using cumene method. Cumene method is a multi-stage process with many disadvantages including the difficulties to gain phenol product in maximum quantities and production of co-product such as acetone which has great amount in market nowadays. One of the alternative routes to produce phenol which has more advantages is through benzene hydroxylation reaction using H2O2 as oxidant agent and Titanium Silikalit-1 (TS-1) as catalyst. TS-1 catalyst has high catalytic activity and selectivity in selective oxidation reaction of aromatic compounds with H2O2 which important for commercial industries. However, the reaction rate is tend to be low because TS-1 has hydrophobic nature and as the result H2O2 adsorption which has hydrophilic nature towards active sites of TS-1 is also become slower. Addition of metal oxide V2O5 could enhance hydrophilicity of TS-1 catalyst. Liquid phase catalytic benzene hydroxylation using hydrogen peroxide as oxidant was carried out over vanadium (V) oxide-modified TS-1 catalyst (V2O5/TS-1), that were prepared by impregnation method using vanadium methavanadate as precursor and characterized by X-ray diffraction, infrared spectroscopy, nitrogen adsorption, pyridine adsorption, and hydrophilicity techniques
Bending Properties of Elephant Grass Fiber Reinforced Epoxy Resin Composites Nurhayati, Alwiyah
JOURNAL OF NATURAL SCIENCES AND MATHEMATICS RESEARCH 2015: JNSMR Volume 1 Issue 1 Year 2015
Publisher : Fakultas Ilmu Tarbiyah dan Keguruan, UIN Walisongo

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Abstract

The use of composite materials with natural fiber filler is known in the industry regarding to improvements in technology process and economic factor. The elephant grass is one of natural fiber that has a pretty good prospect, where grass-processing as filler composite materials are still not widely performed. This study aims to determine the mechanical properties that is bending properties of elephant grass fiber-reinforced epoxy polymer composite by varying its filler’s volume fraction. The fiber  treated by immersing in water for 3 days. Hand lay up process used to prepare the composite specimens with 1%,  3% and 5% volume fraction. 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.

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