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.
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159 Documents
<![CDATA[X-Ray Diffraction and Density Distribution Measurements on the Al2O3 Crystals Grown by Czochralski Method with Different Pull Rate ]]>
<![CDATA[Hadi Kusuma, Hamdan]]>
<![CDATA[ Journal Of Natural Sciences And Mathematics Research Vol 1, No 1 (2015): Volume 1, Nomor 1, 2015 ]]>
Publisher : <![CDATA[Faculty of Science and Technology, State Islamic University Walisongo Central Java ]]>
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<![CDATA[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 of 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 D63dâR3C and has lattice constants being a = 4.759 Ã
, c = 12.99 Ã
. 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.]]>
<![CDATA[X-Ray Diffraction and Density Distribution Measurements on the Al2O3 Crystals Grown by Czochralski Method with Different Pull Rate ]]>
<![CDATA[Hadi Kusuma, Hamdan]]>
<![CDATA[ Journal Of Natural Sciences And Mathematics Research Vol 1, No 1 (2015): Volume 1, Nomor 1, 2015 ]]>
Publisher : <![CDATA[Faculty of Science and Technology, State Islamic University Walisongo Central Java ]]>
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DOI: 10.21580/jnsmr.2015.1.1.475
<![CDATA[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 of 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 D63dâR3C and has lattice constants being a = 4.759 Ã
, c = 12.99 Ã
. 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. © 2015 JNSMR UIN Walisongo. All rights reserved.]]>
<![CDATA[Analisis Aspek Molekuler Biomarka Alkana Bercabang Core Badak 1/208 Muara Badak, Kutai Kartanegara, Kalimantan Timur ]]>
<![CDATA[Firmansyah, R. Arizal]]>;
<![CDATA[Burhan, R. Y. Perry]]>
<![CDATA[ Journal Of Natural Sciences And Mathematics Research Vol 1, No 1 (2015): Volume 1, Nomor 1, 2015 ]]>
Publisher : <![CDATA[Faculty of Science and Technology, State Islamic University Walisongo Central Java ]]>
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DOI: 10.21580/jnsmr.2015.1.1.481
<![CDATA[Study compound biomarka branched alkanes on core 1/208 Rhinos have done to contribute to the activities of oil exploration wells 1/208 Muara Badak Badak, East Kalimantans Kutai Kartanegara-through core biomarka profile branched alkanes. Core samples extracted by alternately with solvent mixture of toluene-methanol (3: 1) and chloroform-methanol (3: 1). Then fractionated by Column Chromatography and Thin Layer Chromatography to obtain aliphatic hydrocarbon fraction. Fractions obtained were identified using Gas Chromatography-Mass Spectrometry.The content biomarka aliphatichydrocarbon fraction were identified, among others, iso and anteiso alkanes, mono and trimethyl alkanes. Compounds iso and anteiso alkanes, and alkyl alkane other, providing information that the source of organic material core samples I and II is derived from microorganisms prokaryotic or biogenic precursor derived from cyanobacteria (marine microorganisms) and homologous monomethyl alkanes found in core samples II closer homologous series monomethyl alkanes found in sediments and oil and Precambrian Proterozoic era, so it can be said that the core sample II core samples older than I.]]>
<![CDATA[Effect of Growth Pressure on Structural Properties of SiC Film Grown on Insulator by Utilizing Graphene as a Buffer Layer ]]>
<![CDATA[Astuti, Budi]]>;
<![CDATA[Abd Rahman, Shaharin Fadzli]]>;
<![CDATA[Tanikawa, Masahiro]]>;
<![CDATA[Mahmood, Mohamad Rusop]]>;
<![CDATA[Yasui, Kanji]]>;
<![CDATA[Manaf Hashim, Abdul]]>
<![CDATA[ Journal Of Natural Sciences And Mathematics Research Vol 1, No 1 (2015): Volume 1, Nomor 1, 2015 ]]>
Publisher : <![CDATA[Faculty of Science and Technology, State Islamic University Walisongo Central Java ]]>
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DOI: 10.21580/jnsmr.2015.1.1.476
<![CDATA[Heteroepitaxial growth of silicon carbide (SiC) on graphene/SiO2/Si substrates was carried out using a home-made hot-mesh chemical vapor deposition (HM-CVD) apparatus. Monomethylsilane (MMS) was used as single source gas while hydrogen (H2) as carrier gas. The substrate temperature, tungsten mesh temperature, H2 flow rate and distance between mesh and substrate were fixed at 750 °C, 1700 °C, 100 sccm and 30 mm, respectively. The growth pressures were set to 1.2, 1.8 and 2.4 Torr. The growth of 3C-SiC (111) on graphene/SiO2/Si were confirmed by the observation of θ-2θ diffraction peak at 35.68°. The diffraction peak of thin film on graphene/SiO2/Si substrate at pressure growth is 1.8 Torr is relatively more intense and sharper than thin film grown at pressure growth 1.2 and 2.4 Torr, thus indicates that the quality of grown film at 1.8 Torr is better. The sharp and strong peak at 33° was observed on the all film grown, that peak was attributed Si(200) nanocrystal. The reason why Si (200) nanocrystal layer is formed is not understood. In principle, it canât be denied that the low quality of the grown thin film is influenced by the capability of our home-made apparatus. However, we believe that the quality can be further increased by the improvement of apparatus design. As a conclusion, the growth pressures around 1.8 Torr seems to be the best pressures for the growth of heteroepitaxial 3C-SiC thin film.]]>
<![CDATA[The Effect of Vanadium Oxide on The Catalytic Activity of Titanium Silicalite in Conversion of Benzene to Phenol ]]>
<![CDATA[Mulyatun, Mulyatun]]>
<![CDATA[ Journal Of Natural Sciences And Mathematics Research Vol 1, No 1 (2015): Volume 1, Nomor 1, 2015 ]]>
Publisher : <![CDATA[Faculty of Science and Technology, State Islamic University Walisongo Central Java ]]>
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DOI: 10.21580/jnsmr.2015.1.1.483
<![CDATA[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 pyridine adsorption and hydrophilicity techniques.]]>
<![CDATA[Simulation Nongravitational Dynamic of Cometary Orbit ]]>
<![CDATA[Arsini, Arsini]]>;
<![CDATA[Saefan, Joko]]>;
<![CDATA[Farchani Rosyid, Muhammad]]>
<![CDATA[ Journal Of Natural Sciences And Mathematics Research Vol 1, No 1 (2015): Volume 1, Nomor 1, 2015 ]]>
Publisher : <![CDATA[Faculty of Science and Technology, State Islamic University Walisongo Central Java ]]>
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DOI: 10.21580/jnsmr.2015.1.1.477
<![CDATA[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. Here, we assume that the comet under consideration is of the form of a ball and rotates so rapidly that the whole of its surface catches the radiation of the sun equally.]]>
<![CDATA[Bending Properties of Elephant Grass Fiber Reinforced Epoxy Resin Composites ]]>
<![CDATA[Nurhayati, Alwiyah]]>
<![CDATA[ Journal Of Natural Sciences And Mathematics Research Vol 1, No 1 (2015): Volume 1, Nomor 1, 2015 ]]>
Publisher : <![CDATA[Faculty of Science and Technology, State Islamic University Walisongo Central Java ]]>
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DOI: 10.21580/jnsmr.2015.1.1.484
<![CDATA[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 fillerâs 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.]]>
<![CDATA[Quaternionic Version of Rotation Groups ]]>
<![CDATA[Rahmawati, Latief]]>;
<![CDATA[Ardhi Khalif, Muhammad]]>;
<![CDATA[Farchani Rosyid, Muhammad]]>
<![CDATA[ Journal Of Natural Sciences And Mathematics Research Vol 1, No 1 (2015): Volume 1, Nomor 1, 2015 ]]>
Publisher : <![CDATA[Faculty of Science and Technology, State Islamic University Walisongo Central Java ]]>
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DOI: 10.21580/jnsmr.2015.1.1.479
<![CDATA[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]]>
<![CDATA[Anatomical Responses of Ajwa Dates Sprouts (Phoenix dactylifera L.) to Water Availability and light Intensity ]]>
<![CDATA[Triastari Armanda, Dian]]>
<![CDATA[ Journal Of Natural Sciences And Mathematics Research Vol 1, No 1 (2015): Volume 1, Nomor 1, 2015 ]]>
Publisher : <![CDATA[Faculty of Science and Technology, State Islamic University Walisongo Central Java ]]>
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DOI: 10.21580/jnsmr.2015.1.1.480
<![CDATA[As the biggest Moslem population in the world, Indonesia still has a high dependency on importing date palms from other countries. 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. Adaptation and optimation of environmental factors for Ajwa dates cultivation in Indonesia are important to be conducted to meet the date palm demand of this country. A study on anatomical responses of Ajwa dates sprouts to water availability and light intensity has been conducted. Ajwa date sprouts had been exposed to combinations of three shade variations (0%, 50%, and 90% shade) and four water availability variations (25%, 50%, 75%, and 100% of the field capacity). Data were taken from day 0 until day 45 of germination. Morphological parameters which observed and analyzed were the leaf blade length and sprouts root length. Anatomical parameters which observed and analyzed were root radius, stele diameter, leaves numbers, leaves thickness, and stomatal diameter. Variations on water availability and light intensity gave the same effect (not significantly different) in almost every parameters which measured, therefore, the most optimal combination water-light treatment was still unknown. Advanced research and longer duration of experiment need to be conducted to gain the complete information regarding the optimization of environmental factors to increase the Ajwa date productivity in Indonesia.]]>
<![CDATA[The Solution Of Nonhomogen Abstract Cauchy Problem by Semigroup Theory of Linear Operator ]]>
<![CDATA[Hariyanto, Susilo]]>
<![CDATA[ Journal Of Natural Sciences And Mathematics Research Vol 2, No 2 (2016): Volume 2, Nomor 2, 2016 ]]>
Publisher : <![CDATA[Faculty of Science and Technology, State Islamic University Walisongo Central Java ]]>
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DOI: 10.21580/jnsmr.2016.1.2.1656
<![CDATA[In this article we will investigate how to solve nonhomogen degenerate Cauchy problem via theory of semigroup of linear operator. The problem is formulated in Hilbert space which can be written as direct sum of subset Ker M and Ran M*. By certain assumptions the problem can be reduced to nondegenerate Cauchy problem. And then by composition between invers of operator M and the nondegenerate problem we can transform it to canonic problem, which is easier to solve than the original problem. By taking assumption that the operator A is infinitesimal generator of semigroup, the canonic problem has a unique solution. This allow to define special operator which map the solution of canonic problem to original problem. ©2016 JNSMR UIN Walisongo. All rights reserved.]]>
