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Journal of Natural Sciences and Mathematics Research
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2460-4453
Published by UIN - Walisongo Homepage  [14 journals]
  • The Effect of Gel-Electrolyte on Dye Sensitized Solar Cell (DSSC)
           Prototype based on Nanosized-TiO2 Using Mangosteen Pericarp as Absorber

    • Authors: Biaunik Niski Kumila, Gontjang Prajitno
      Pages: 186 - 190
      Abstract: Dye Sensitized Solar Cell (DSSC) with Fluorine deped Tin Oxide (FTO) substrat and nanosize-TiO2 layer sensitized by “dye” ,mangosteen pericarp extract, was succesfully fabricated. Gel-Electrolyte as electron regenerator was synthesized by adding Polyethylene Glycol (PEG) 1000 to electrolyte solution while nanosize-TiO2 was synthesized by co-precipitation method from TiCl3 solution. The crystal size of TiO2 characterized by X-Ray Diffraction is 10.5 nm in size. The solar absorbance of “dye” mangosteen pericarp was measured using UV-Vis Spectrophotometer and it showed that the dye can absorb photon at Near Ultraviolet (NUV) to yellow visible light. Nanosize-TiO2 based DSSC with gel-electrolyte successfully reached short circuit current up to 30.9 μA, open circuit voltage 398.3 mV and performed the long term stability. ©2017 JNSMR UIN Walisongo. All rights reserved
      PubDate: 2017-08-25
      Issue No: Vol. 3, No. 1 (2017)
  • Car Robots of Line Followers and False Detections Using Microcontroller of
           BS2SX Basics Tamp

    • Authors: Sujarwoto Sujarwoto
      Pages: 191 - 197
      Abstract: 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
      PubDate: 2017-08-25
      Issue No: Vol. 3, No. 1 (2017)
  • Synthesis and Characterization of Cassava Shell Based Biodegradable
           Plastic with Kitosan Addition

    • Authors: Supriyono Supriyono, Hamdan Hadi Kusuma, Mulyatun Mulyatun, Biaunik Niski Kumila
      Pages: 198 - 202
      Abstract: 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.
      PubDate: 2017-08-25
      Issue No: Vol. 3, No. 1 (2017)
  • The Application of Music Therapy For Children with Autism Based On Facial
           Recognition Using Eigenface Method

    • Authors: Hesti Khuzaimah Nurul Yusufiyah, Ilona Usuman, Agfianto Eko Putra, Triyogatama Wahyu Widodo
      Pages: 203 - 209
      Abstract: 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.
      PubDate: 2017-08-25
      Issue No: Vol. 3, No. 1 (2017)
  • Effect of Thickness on Thermal Conductivity Based on Waste Newspaper
           Particle Board

    • Authors: Yoan Theasy, Agus Yulianto, Budi Astuti
      Pages: 210 - 214
      Abstract: Waste newspaper by most people still considered as waste that has not been used optimally, and it is the one of processed materials from wood which has lignocellulose. The material has the potential to produce particle board to test the value of thermal conductivity, which it is expected to be used as heat insulator. The process of producing particle board is by mixing 450 grams pureed newspaper with 260 grams PVAC, then print it with size (12x7)cm2 with the thickness of 0.5cm; 1 cm; 1.5 cm; 2 cm; 2.5 cm; 3 cm. The process to make particle board drying is for 5 days and the test of thermal conductivity using a 100 watt heat source, and an infrared thermometer. The result obtained from the value of thermal conductivity from newspaper particle board is when more higher value of particle board thickness then more higher the thermal conductivity value. From these result it can be concluded that the particle board which can be used as heat insulation material is the one that has a thermal conductivity value of 0.066 W/ mC; 0.125 W/ mC; 0.0167 W/ mC with thickness range of 1 cm to 2 cm.©2017 JNSMR UIN Walisongo. All rights reserved.
      PubDate: 2017-08-25
      Issue No: Vol. 3, No. 1 (2017)
  • Synthesis and Structure Characterization of SiO2 from Petung Bamboo Leaf
           Ash (Dendrocalamus asper (Schult.f.) Backer ex Heyne)

    • Authors: Wirda Udaibah, Agus Priyanto
      Pages: 215 - 220
      Abstract: The Research about Synthesis and Characterization of SiO2 have been worked. We have synthesized Silica from “petung”bamboo leaf ash as SiO2 source. This step used sol gel methode. SiO2 were characterized by Fourier Transform Infra Red (FTIR) to investigated the stucture andX-Ray Diffaction to know about structure and crystallinity. FTIR spectra show peak at 617,22 cm-1 area that spesific for Si-H bond, peak at 786,96 cm-1and 1095,57 cm-1 area specific for Si-O-Si bonds. Difractogram of SiO2 show that there are peak at 2θ 21,99; 31,67 and 38,88 were specific for SiO2 that calcinated at 800oC, while for SiO2 that calcinated at 400oC there were no peak at 2θ 31,67 dan 38,88. That peaks not shown may be because low crystallinity of SiO2 that calcinated at 400oC. Calcination temperature greatly affects the crystallinity of SiO2.©2017 JNSMR UIN Walisongo. All rights reserved.
      PubDate: 2017-08-25
      Issue No: Vol. 3, No. 1 (2017)
  • P-Convexity Property in Musielak-Orlicz Function Space of Bohner Type

    • Authors: Yulia Romadiastri
      Pages: 221 - 227
      Abstract: 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.
      PubDate: 2017-08-25
      Issue No: Vol. 3, No. 1 (2017)
  • The Diversity of the Dragonfly of Orthetrum Genus in Protected Area of
           Mount Prau, Central Java Indonesia

    • Authors: Siti Mukhlisoh Setyawati, Puwowidodo Puwowidodo, Muh. Miftahul Huda, Bita Afriyanti Dewi
      Pages: 228 - 235
      Abstract: 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.
      PubDate: 2017-06-30
      Issue No: Vol. 3, No. 1 (2017)
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Heriot-Watt University
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