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.
Articles
222 Documents
<![CDATA[Effect of Growth Pressure on Structural Properties of SiC Film Grown on Insulator by Utilizing Graphene as a Buffer Layer ]]>
<![CDATA[Budi Astuti]]>;
<![CDATA[Shaharin Fadzli Abd Rahman]]>;
<![CDATA[Masahiro Tanikawa]]>;
<![CDATA[Mohamad Rusop Mahmood]]>;
<![CDATA[Kanji Yasui]]>;
<![CDATA[Abdul Manaf Hashim]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 1, No 1 (2015): June ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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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 can’t 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[Car Robots of Line Followers and False Detections Using Microcontroller of BS2SX Basics Tamp ]]>
<![CDATA[Sujarwata Sujarwata]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 3, No 1 (2017): June ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2017.3.1.1693
<![CDATA[This study aims to design a robot car that can follow the line and can avoid obstacles if it detects objects. The movement of the robot car is equipped with light sensor (LDR) and ultrasonic as its navigation system. Automation system navigation settings using BS2SX Basic Stamp microcontroller hardware, while the software with Pbasic programming language. The program is written on the Basic Stamp Editor already installed on the PC, then downloaded to EEPROM. Ultrasonic sensors are utilized as a detection of obstacles and light sensor sensors (LDR) as a tracked line detector. The robot will follow the designed line, if there are obstacles in front of it the robot will avoid and run back if the ultrasonic sensor does not detect obstacles in front of it. With the PWM signal input setting (Pulse Width Modulation) from the microcontroller, the robot car can walk straight, turn and will avoid when detecting obstacles. ©2017 JNSMR UIN Walisongo. All rights reserved]]>
<![CDATA[The Solution Of Nonhomogen Abstract Cauchy Problem by Semigroup Theory of Linear Operator ]]>
<![CDATA[Susilo Hariyanto]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 2, No 2 (2016): December ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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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.]]>
<![CDATA[In Vitro Inhibition Capacity in Ca Oxalate Formation by Lemon (Citrus Lemon) Juice ]]>
<![CDATA[Endang Tri Wahyuni Maharani]]>;
<![CDATA[Jatmiko Susilo]]>;
<![CDATA[Arifiani Agustin Amalia]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 1, No 2 (2015): December ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2015.1.2.1638
<![CDATA[This research aims to determine the inhibition capacity of lemon juice (Citrus lemon) in the formation of calcium oxalate in a variety of concentrations of 5%, 7.5%, 10% which is then compared to pure citric acid. Lemon juice contains citric acid that can inhibit calcium oxalate’s formation. Inhibitory activity found in lemon juice is examined by observing its inhibition capacity towards the formation of calcium oxalate crystal. At the end of the treatment process the turbidity level is compared to citric acid acting as an inhibitor in the formation of calcium oxalate and then the percentage of the inhibition capacity is calculated. Result of the study shows that the optimum concentration of the lemon juice (Citrus lemon) and citric acid is 10%. The inhibition capacities in calcium oxalate formation by lemon juice with concentration variations of 5%, 7.5%, 10% are 47.06%, 73.68%, 94.19% and by citric acid with concentration variations of 5%, 7.5 %, 10% are 29.90%, 30.85%, 42.30%. It can be concluded that the higher the concentration of lemon juice and citric acid used the higher the inhibition capacity of calcium oxalate. Based on the inhibition capacity percentage, lemon juice is more effective in inhibiting the formation of calcium oxalate compared to citric acid and it can function as an alternative to prevent the formation of kidney stone. © 2015 JNSMR UIN Walisongo. All rights reserved]]>
<![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): June ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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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[P-Convexity Property in Musielak-Orlicz Function Space of Bohner Type ]]>
<![CDATA[Yulia Romadiastri]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 3, No 1 (2017): June ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2017.3.1.1728
<![CDATA[In this paper, we described about Musielak-Orlicz function spaces of Bochner type. It has been obtained that Musielak-Orlicz function space of Bochner type becomes a Banach space. It is described also about P-convexity of Musielak-Orlicz function space of Bochner type. It is proved that the Musielak-Orlicz function space of Bochner type is P-convex if and only if both spaces and X are P-convex.©2017 JNSMR UIN Walisongo. All rights reserved.]]>
<![CDATA[Richness of Butterflies Species at Three Habitat Type in Karimunjawa Island Central Java ]]>
<![CDATA[Wisnu Bayu Murti]]>;
<![CDATA[Nugroho Edi Kartijono]]>;
<![CDATA[Margareta Rahayuningsih]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 2, No 2 (2016): December ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2016.1.2.1661
<![CDATA[The purpose of this research was to determine the species richness of butterflies on three type habitats in Karimunjawa Island. The research was conducted in May-October 2016. The research location on the island of Karimunjawa in three habitat types, edge of lowland tropical forest, paddy fields and settlements. Sampling was conducted four times of observation on each habitat type and Point Count Method. Identification species of butterflies use a guidebook Serangga Taman Nasional Gunung Halimun Jawa Bagian Barat and analyzed by uses Margalef Index. The results showed total 49 species of butterflies from 1402 individual (5 Family) was found in three types of habitat. Butterfly species richness highest in a edge habitat of lowland tropical forest (5.9), settlements (5.2), and paddy fields (4.6). ©2016 JNSMR UIN Walisongo. All rights reserved.]]>
<![CDATA[The Characteristics of Material DSSC (Dye-Sensitized Solar Cell) Solar Cell from Extraction of Teak Leaves ]]>
<![CDATA[Hamdan Hadi Kusuma]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 2, No 1 (2016): June ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2016.1.1.1645
<![CDATA[The research of solar cell with using dye from natural materials as a sensitizer in a dye-sensitized solar cell (DSSC) continues to grow. One advantage of the DSSC is does not require a material with high purity so that the production cost is relatively low. This research aims to analyze the characteristics of the absorption band of teak leaf extract. Extraction of teak leaves dissolved in a mixture of ethanol and acetic acid with a variation ratio of 1: 0, 1: 1 and 5.66: 1, resulting in a solution of each color reddish yellow, reddish brown and dark red. Absropsi test results with UV-Vis spectrometer showed that there are peaks in the absorbance in the visible region, ie at wavelengths between 500 nm to 560 nm. This shows that the dye material of teak leaf extract may work or absorb the green color. While absobption other peaks are also found in pektrum wavelength of 580 nm, 600 nm and 660 nm, each of which can absorb the green color yellow, orange and red. ©2016 JNSMR UIN Walisongo. All rights reserved.]]>
<![CDATA[Green Concrete Made From Iron Slag Waste ]]>
<![CDATA[Mulyatun Mulyatun]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 1, No 2 (2015): December ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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DOI: 10.21580/jnsmr.2015.1.2.1603
<![CDATA[Synthesis of green concrete has been carried out by using iron slag waste of PT Inti Jaya Steel Jrakah, Semarang. Geopolimer (green concrete) is an aluminosilicate inorganic polymer with chain Si-O-Al that can be synthesized from material rich in silica and alumina with sodium hydroxide as an activator. Iron slag chemical content analysis indicated that this material is a part of pozzolan material with each individual components weight as follow: SiO2: 4.55%, Al2O3: 2.54%, CaO: 11.43%, Fe2O3: 77.10%, MnO2: 1.43 and other minerals: 4.07%. The mole ratio of SiO2/Al2O3 of iron slag waste of PT Inti Jaya Steel Jrakah, Semarang is quite high at 3.05. Although the ratio is high, it is still can be synthesized using an activator solution of NaOH and increasing the drying time to 3 days and 24 hours of curing time at 60°C temperature to help the process of water molecule condensation in the geopolymerisation process. Characterized concrete (green concrete) that has been formed shows that the maximum compressive power can be achieved at composition ratio of Iron slag/ Na-silicate /NaOH /H2O of 55/10/4/8, with compressive power of 11.254 MPa. © 2015 JNSMR UIN Walisongo. All rights reserved.]]>
<![CDATA[Simulation Nongravitational Dynamic of Cometary Orbit ]]>
<![CDATA[Arsini Arsini]]>;
<![CDATA[Joko Saefan]]>;
<![CDATA[Muhammad Farchani Rosyid]]>
<![CDATA[ Journal of Natural Sciences and Mathematics Research Vol 1, No 1 (2015): June ]]>
Publisher : <![CDATA[Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang ]]>
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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.]]>
