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Sainteknol : Jurnal Sains dan Teknologi
Published by Universitas Negeri Semarang
ISSN : 02164566     EISSN : 25273604     DOI : http://dx.doi.org/10.15294/sainteknol
Core Subject : Science,
Computer Science & IT
Sainteknol published a scientific paper on the results of research and studies in the field of science and technology. Published biannually in June and December contained the writings lifted from the results of research and critical-analysis study in science and technology.
Arjuna Subject : Umum - Umum
Articles 26 Documents
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Search results for , issue "Vol 14, No 2 (2016): December 2016" : 26 Documents clear
CHEMICALLY MODIFIED KAPOK SAWDUST FOR ADSORPSTION OF METHYL VIOLET DYE FROM 1 Widi Astuti, Triastuti Sulistyaningsih AQUEOUS SOLUTION Astuti, Widi; Sulistyaningsih, Triastuti
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 2 (2016): December 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i2.9001

Abstract

The potential of chemically modified Kapok sawdust for methyl violet adsorption was investigated in a batch adsorption process. Various physicochemical parameters such as pH, contact time and initial dye concentration were studied. The adsorbent was characterized with Fourier transform infrared spectrophotometer, scanning electron microscope and Brunauer, Emmett and  Teller (BET) analysis. The optimum conditions for methyl violet adsorption were pH 5 and contact time 30 min. Langmuir, Freundlich and Redlich-Peterson isotherm model were used to analyze the equilibrium data. The experimental data fitted well with the Redlich-Peterson model, with the value of constants are 41.001 L g -1 for K R , 0.523 L 0.799 mg -0.799 for a and 0.799 for β
PHYSICAL CHARACTERISTICS AND MAGNETIC PROPERTIES OF BAFE12O19/SRTIO3 BASED COMPOSITES DERIVED FROM MECHANICAL ALLOYING Widodo, Rahmat Doni; Manaf, Azwar
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 2 (2016): December 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i2.8994

Abstract

Barium hexaferrite and strontium titanate are well established permanent magnet and piezoelectric materials which are technologically and scientifically attractive due to their potential for various applications in the field of magnetic electronics functional materials. However, the material properties for both require a careful control of grain structure as well as microstructure design to meet a specific application. In this work, we report some results of materials characterization especially particles and grains which were promoted during mechanical milling of a BaFe12O19/SrTiO3 composite system. These are including mean particle size characterization by Particle Size Analyzer and mean grain size determination by means of line broadenning analysis employing a step scanning counting in XRD apparatus for composite powders at various milling time up to 60 hours. It was found that the particle size of composite powders initially increased due to laminated layers formation of a composite and then decreased to an asymptotic value of ~8 μm as the milling time extended even to a relatively longer time. However, based on results of line broadening analysis the mean grain size of the particles was found in the nanometer scale. We thus believed that mechanical blending and milling of mixture components for the composite materials has promoted heterogeneous nucleation and only after successive sintering at 1100 oC the milled powder transformed into particles of nanograin. In thireport, microstructure as well as magnetic properties for the composite is also briefly discussed.
PEMBUATAN TRIGGER GAMELAN DENGAN MEMANFAATKAN MIKRO KONTROLER ARDUINO NANO AT328 Haryono, Slamet; Wadiyo, Wadiyo
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 2 (2016): December 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i2.8995

Abstract

Ditemukannya Gatul (Gamelan Tutul) oleh Dosen di ITS (Institut Teknologi Surabaya dan E-Gamelan di Udinus (Universitas Dian Nuswantoro) serta hasil penelitian di Unnes berjudul “Aplikasi Teknologi Sampling dalam Pembuatan Soundfont Suara Gamelan sebagai Media Pembelajaran Seni Musik SMP di Kota Semarang” membuka peluang untuk diciptakan Triger Gamelan yang dapat digunakan sebagai media pembelajaran musik. Permasalahan utama yang diajukan dalam penelitian ini adalah bagaimanakah pembuatan prototip triger gamelan dengan memanfaatkan Mikro kontroler Arduino nano AT328? Oleh karena itu tujuan penelitian ini bertujuan untuk mengembangkan prototip triger gamelan dengan memanfaatkan Mikro kontroler Arduino nano AT328 yang dapat digunakan sebagai media pembelajaran musik di SD. Metode yang digunakan adalah metode penelitian dan pengembangan atau Research and Development (R&D) yang diadopsi dari Borg and Gall (1989:784) dengan sepuluh langkah penelitian. Produk luaran yang dihasilkan adalah prototip triger gamelan, dan panduan penggunaannya.
CHACARTERIZATION OF LOCAL DURIAN GERMPLASM BASED ON THE MORPHOLOGY OF FRUIT Retnoningsih, Amin; Rahayu, Enni Suwarsi; Sari, Ika Puspita
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 2 (2016): December 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i2.8989

Abstract

One of the efforts to improve the quality and the conservation of local fruits like durian requires characteristic certainty of durian fruits according to the needs of plant breeders and tastes of consumers. Some durian germplasm at Hortimart Agro Center in Central Java have been successfully characterized. There are 43 accessions with 18 characters covering 64 character states of fruit. The dendrogram showed that those 43 accessions split into 2 groups. Durian Kartomarmo separated from the other 42 accessions. Durian Kartosumarmo has a unique characteristic on its fruit, which has an apex with irregular shape (mammiform). Some durians which have good taste, such as durian Bismo, Cokro, Janoko, and Petruk were grouped together with durian Monthong. The coeffient similarity in 43 accessions of the durian fruit is between 0.44-0.86. The diversity of accessions based on the fruit morphology showed that these 43 accessions were different and not a duplicate of different accessions. It shows that each of accession should be categorized as a different cultivar since there are many other characteristics that have not been observed.
DEVELOPMENT OF CHEMSITRY TEACHER PROFESSIONALISM THROUGH PEDAGOGICAL CONTENT KNOWLEDGE TRAINING Haryani, Sri; Wardani, Sri; Prasetya, Agung Tri
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 2 (2016): December 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i2.8996

Abstract

This study aims to analyze the impact of Pedagogical Content Knowledge (PCK) training to the development of chemistry teachers’ professionalism through MGMP. The study involved 5 chemistry teachers who measured the PCK capability through filling CoRe (Content Representation) and writing PaPeRs (Pedagogical and Professional-experience Repertoires), which represents the PCK of a teacher as proposed by Loughran. Quantitative data drawn from the results of the fillingCoRe,Lesson Plan (RPP), and PaP-eRs instruments, whereas qualitative data were taken from the three linkage analysis supported by the results of the interview. Based on the results of data analysis revealed that PCK training can develop the teachers professionalism as measured by the PCK capability especially in minimizing the weaknesses that have been prevalent as how to express apperception, the depth of the material, determine the learning strategies, and pay attention to the prerequisites material.
ANTIMICROBIAL ACTIVITY OF METHANOL EXTRACT FROM MAHOGANY SEEDS Sri Mursiti, Supartono (SWIETENIA MACROPHYLLA, KING) Mursiti, Sri; Supartono, Supartono
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 2 (2016): December 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i2.8991

Abstract

Mahogany seeds is one of the natural ingredients that can be used as an antimicrobial. This study aims to determine the antimicrobial activity of methanol extract mahogany seeds and determine the components of active compounds that have antimicrobial activity against Escherichia coli (E.coli) and Bacillus cereus (B.cereus). Extraction was done by maceration method with methanol and testing of antimicrobial activity using the absorption method. The results showed that the antimicrobial activity of methanol extract mahogany seeds shows inhibitory activity and provide clear zone against bacteria E.coli with value Inhibitory Regional Diameter 16,75 mm respectively, but did not give a clear zone of the bacterium B.cereus. Based on the results of the study it can be concluded that the methanol extract of seeds mahogany has antimicrobial activity against E.coli.
POLA AKUMULASI LOGAM CU IKAN BANDENGSELAMA PERIODE PERTUMBUHAN DI TAMBAK ES, Sri Mulyani; Martuti, Nana Kariada Tri; Irsadi, Andin
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 2 (2016): December 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i2.8997

Abstract

Akibat kerusakan pantai dan lahan mangrove di kawasan pesisir pantai Kota Semarang menyebabkan menurunnya kualitas lingkungan wilayah pesisir. Penurunan kualitas lingkungan ini berpengaruh pada lingkungan tambak yang berada di wilayah pesisir pantai yang juga akan mempengaruhi kualitas ikan yang dipelihara di tambak-tambak di wilayah pesisir pantai. Ikan Bandeng merupakan salah satu hasil budidaya ikan di tambak yang banyak terdapat di daerah pantai atau pesisir. Sampel dalam penelitian ini berupa:logam Cu pada air, sedimen serta ikan bandeng pada tambak penelitian yang sudah ditentukan. Kualitas lingkungan yang terdiri dari: DO, pH, salinitas dan suhu perairan. Penelitian ini menggunakan pendekatan ekologi (ecological approach).Data bioakumulasi logam Cu dalam sedimen, air dan ikan bandeng dianalisis berdasarkan rumus FK dan BCF yang ada.Dari penelitian yang telah dilakukan, diperoleh hasil kandungan logam Cu pada peraiarn tambak antara 0,2-0,3 ppm dan sedimen antara 18,088-22,81 ppm. Kadar logam dalam air tersebut sudah berada di atas ambang batas yang telah ditentukan Pemerintah berdasarkan Keputusan Menteri Lingkungan Hidup No 51 Tahun 2004 tentang Baku Mutu Air Laut, kadar Cu untuk biota laut 0,008 mg/L. Untuk itu perlu mendapat perhatian adanya pencemaran logam Cu di tambak bandeng wilayah Tapak. Kandungan logam Cu pada ikan di wilayah Tapak (1.165 - 3.396 ppm ) masih di bawah ambang batas yang diijinkan BPOM No. 03725/B/SK/VII/89Tahun 1989 sebesar 20 ppm, tetapi harus tetap diwaspadai mengingat sifatnya yang akumulatif dan membahayakan kesehatan manusia yang mengkomsumsinya.
PERFORMANCE OF PHOTOCATALYST BASED CARBON NANODOTS FROM WASTE FRYING OIL IN WATER PURIFICATION Aji, Mahardika Prasetya; Wiguna, Pradita Ajeng; Susanto, Susanto; Rosita, Nita; Aisyah, Siti; Suciningtyas, Suciningtyas; Sulhadi, Sulhadi
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 2 (2016): December 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i2.8992

Abstract

Carbon Nanodots (C-Dots) from waste frying oil could be used as a photocatalyst in water purification with solar light irradiation. Performance of C-Dots as a photocatalyst was tested in the process of water purification with  a given synthetic sewage methylene blue. The tested was also conducted by comparing the performance C-Dots made from frying oil, waste fryng oil as a photocatalyst and solution of methylene blue without photocatalyst C-Dots. Performance of C-Dots from waste frying oil were estimated by the results of absorbance spectrum. The results of measurement absorbance spectrum from the process of water purification with photocatalyst C-Dots showed that the highest intensity at a wavelength 664 nm of methylene blue decreased. The test results showed that the performance of photocatalyst C- Dots from waste frying oil was better in water purification. This estimated that number of particles C-dots is more in waste frying oil because have experieced repeated the heating process so that the higher particles concentration make the photocatalyst process more effective. The observation of the performance C-Dots from waste frying oil as a photocatalyst in the water purification processes become important invention for solving the problems of waste and water purification.
PERFORMANCE OF PHOTOCATALYST BASED CARBON NANODOTS FROM WASTE FRYING OIL IN WATER PURIFICATION
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 2 (2016): December 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i2.8992

Abstract

Carbon Nanodots (C-Dots) from waste frying oil could be used as a photocatalyst in water purification with solar light irradiation. Performance of C-Dots as a photocatalyst was tested in the process of water purification with  a given synthetic sewage methylene blue. The tested was also conducted by comparing the performance C-Dots made from frying oil, waste fryng oil as a photocatalyst and solution of methylene blue without photocatalyst C-Dots. Performance of C-Dots from waste frying oil were estimated by the results of absorbance spectrum. The results of measurement absorbance spectrum from the process of water purification with photocatalyst C-Dots showed that the highest intensity at a wavelength 664 nm of methylene blue decreased. The test results showed that the performance of photocatalyst C- Dots from waste frying oil was better in water purification. This estimated that number of particles C-dots is more in waste frying oil because have experieced repeated the heating process so that the higher particles concentration make the photocatalyst process more effective. The observation of the performance C-Dots from waste frying oil as a photocatalyst in the water purification processes become important invention for solving the problems of waste and water purification.
CHEMICALLY MODIFIED KAPOK SAWDUST FOR ADSORPSTION OF METHYL VIOLET DYE FROM 1 Widi Astuti, Triastuti Sulistyaningsih AQUEOUS SOLUTION
Sainteknol : Jurnal Sains dan Teknologi Vol 14, No 2 (2016): December 2016
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v14i2.9001

Abstract

The potential of chemically modified Kapok sawdust for methyl violet adsorption was investigated in a batch adsorption process. Various physicochemical parameters such as pH, contact time and initial dye concentration were studied. The adsorbent was characterized with Fourier transform infrared spectrophotometer, scanning electron microscope and Brunauer, Emmett and  Teller (BET) analysis. The optimum conditions for methyl violet adsorption were pH 5 and contact time 30 min. Langmuir, Freundlich and Redlich-Peterson isotherm model were used to analyze the equilibrium data. The experimental data fitted well with the Redlich-Peterson model, with the value of constants are 41.001 L g -1 for K R , 0.523 L 0.799 mg -0.799 for a and 0.799 for β

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