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Jurnal Pijar MIPA
Published by Universitas Mataram
ISSN : 19071744     EISSN : 24601500     DOI : -
Core Subject : Science, Education,
Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics
Jurnal Pijar MIPA (e-ISSN: 2460-1500 & p-ISSN: 1907-1744) is an open-access scientific periodical journal published by the Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA publishes original articles on current issues and trends in mathematics-science-science education studies. In addition, this journal addresses issues concerning environmental education and environmental science. The journal scopes are: a. Physics and Physics Education b. Chemistry and Chemistry Education c. Biology and Biology Education d. Natural Science and Science Education e. Mathematics and Mathematics Education f. Environmental and Environmental Education
Arjuna Subject : Umum - Umum
Articles 8 Documents
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Search results for , issue "Vol. 5 No. 1 (2010): MARET" : 8 Documents clear
EFISIENSI INHIBITOR PADA KOROSI Cu-37Zn Eka Junaidi
Jurnal Pijar Mipa Vol. 5 No. 1 (2010): MARET
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (235.148 KB) | DOI: 10.29303/jpm.v5i1.133

Abstract

Abstrak : Salah satu upaya pencegahan korosi pada logam dapat dilakukan dengan penambahan inhibitor ke dalam larutan uji. Inhibitor korosi yang dicoba adalah benzotriazol (BTAH) dan sistein (Cys). Penentuan laju korosi Cu-37Zn tanpa dan dengan adanya inhibitor korosi dilakukan secara elektrokimia dengan menggunakan teknik Electrochemical Impedance Spectroscopy (EIS). Hasil penelitian ini menunjukkan bahwa pada larutan uji dengan komposisi : 5,3 ppm Ca(NO3)2, 78 ppm NaCl dan ion sulfida sebesar 15 ppm diperoleh bahwa efisiensi benzotriazol (80 ppm) dan sistein (25 ppm) pada suhu kamar berturut-turut sebesar 40,74% dan 68,16%. Inhibitor yang di uji dalam penelitian ini teradsorpsi secara fisik pada permukaan logam Cu-37Zn dengan energi bebas adsorpsi (ΔGads) benzotriazol dan sistein berturut-turut adalah –18,53 dan –23,03 kJ/mol. Kata kunci : Inhibitor, EIS, Benzotriazol, Sistein Abstract : An effort to prevent of the corrosion can be performed by mean of inhibitor corrosion addition into the sample of water. We also investigated benzotriazole (BTAH) and cysteine (CYS) as inhibitor. The rates of corrosion Cu-37Zn in absence and presence of the corrosion inhibitor were determined by using Electrochemical Impedance Spectroscopy (EIS) technique. The obtained results were indicated that at sample of water with composition of 5.3 ppm Ca(NO3)2, 78 ppm NaCl and 15 ppm sulfide ion,  the inhibitor efficiency of benzotriazole (80 ppm) and cysteine (25 ppm) at room temperature were 40.74% and 68.16% respectively. Since both inhibitors were physicaly adsorbed on Cu-37Zn with adsorption free energy (ΔGads)of benzotriazole and cysteine is –18.53 kJ/mol and –23.03 kJ/mol respectively. Keywords : Inhibitor, EIS, Benzotriazole, cysteine.
PENERAPAN PENDIDIKAN MATEMATIKA REALISTIK UNTUK MEMBANGUN PEMAHAMAN SISWA TENTANG KONSEP PECAHAN Syahrul Azmi
Jurnal Pijar Mipa Vol. 5 No. 1 (2010): MARET
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (164.589 KB) | DOI: 10.29303/jpm.v5i1.159

Abstract

Abstrak : Tulisan ini bertujuan mendeskripsikan pengimplementasian pendidikan matematika realistik pada pembelajaran materi pecahan di kelas IV SDN 2 Penedagandor yang dapat membangun pemahaman siswa tentangkonsep pecahan. Penelitian ini merupakan penelitian tindakan kelas yang dilaksanakan dalam 2 siklus. Hasil penelitian menunjukkan bahwa pada siklus I ketuntasan belajar yang dicapai siswa adalah 34,6% dengan rata-rata hasil tes 60,2. Pada siklus II, ketuntasan belajar mencapai 88,5% dengan rata-rata hasil tes 79,5. Aktivitas belajar siswa pada siklus I berada pada kategori baik, sedang pada siklus II meningkat pada kategori sangat baik. Sehingga dapat dikatakan bahwa kegiatan pembelajaran berlangsung efektif. Dari hasil penelitian ini dapat disimpulkan bahwa melalui kegiatankegiatan yang sesuai dengan realitas atau pengalaman siswa sehari-hari, siswa dapat membangun sendiri pemahaman mereka tentang konsep pecahan.Kata kunci : matematika realistik, pemahaman, konsep pecahanAbstract : The aim of this paper is to describe the implementation of realistic mathematics education in the learning factions in class IV SDN 2 Penedagandor which can build students’ understanding of the concept of fractions. This research is a classroom action research which is carried out in 2 cycles. The results showed that the learning exhaustiveness in cycle I achieved 34.6% with score average is 60.2, and in cycle II, achieved 88.5% with scoreaverage 79.5. Student learning activities in cycle I is good, while in cycle II is very good. Therefore, it can be said that learning activities is very effectively. The conclusion is that students can build their own understanding of the concept of fractions through activities that correspond to reality or their life experience.Keywords : mathematics realistic, understanding, the concept of fractions
UJI KEBERADAAN DAN VIABILITAS SEL Lactobacillus bulgaricus PADA PEMBUATAN VCO FERMENTASI YANG BERFUNGSI PROBIOTIK Sarkono S a r k on o; Nur Indah Julisaniah
Jurnal Pijar Mipa Vol. 5 No. 1 (2010): MARET
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (198.639 KB) | DOI: 10.29303/jpm.v5i1.160

Abstract

Abstrak: Salah satu upaya pengembangan produk kelapa adalah pembuatan minyak kelapa murni atau biasa disebut Virgin coconut oil (VCO). Selain dengan proses sentrifugasi, VCO juga dapat dibuat dengan bantuan mikrobia khususnya bakteri. Dalam penelitian ini dilakukan pembuatan VCO dengan  metode fermentasi mengggunakan bakteri Lactobacillus bulgaricus. Hasil penelitian menunjukkan bahwa bakteri L. bulgaricus dapat digunakan sebagai salah satu alternatif  dalam pembuatan VCO dengan cara fermentasi. Setelah proses fermentasi, sel bakteri L. bulgaricus lebih banyak berada pada lapisan blondo, diikuti lapisan air dan lapisan minyak.  Sedangkan berdasarkan uji viabilitas selama penyimpanan, jumlah sel L. bulgaricus terus mengalami penurunan jumlah sel hidup selama penyimpanan. Waktu penyimpanan maksimal dimana masih terdapat sel L. bulgaricus pada VCO adalah 24 hari.Kata kunci : VCO, Lactobacillus bulgaricus, Viabilitas. Abstract: An effort of coconut product development is making the pure coconut oil or so-called Virgin Coconut Oil (VCO). Besides of centrifugation process, VCO can be also made by biological process, especially using bacteria. Bacterial fermentation method with Lactobacillus bulgaricus was performed to produce VCO. The results showed that the bacterium L. bulgaricus can be used as an alternative in producing VCO by way of fermentation. After the fermentation process, bacterial cells L. bulgaricus mostly present at blondo layer, followed by a layer of water and oil layers. Meanwhile, based on testing the viability during storage, the number of cell L Bulgaricus been steadily declining number of living cells during storage. The maximum storage time for L. bulgaricus on the VCO is 24 days. Keywords: VCO, Lactobacillus bulgaricus, Viability.
KETAHANAN ALAMIAH KAYU JAWA BAHAN BANGUNAN RUMAH DI PEDESAAN PANTAI UTARA JAWA TENGAH TERHADAP GANGGUAN RAYAP BAWAH TANAH Supriyanto Supriyanto
Jurnal Pijar Mipa Vol. 5 No. 1 (2010): MARET
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (201.301 KB) | DOI: 10.29303/jpm.v5i1.161

Abstract

Abstrak: Penelitian bertujuan untuk mengetahui prosentase ketahanan kayu Jawa bahan bangunan rumah di pedesaan pantai utara Jawa Tengah terhadap gangguan rayap bawah tanah (Nasutitermes sp.). Penelitian dilakukan di 8 kota/kabupaten, laboratorium Biologi FMIPA UNNES dan laboratorium Teknik Sipil FT UNNES. Populasi penelitian adalah 4 jenis kayu Jawa bahan konstruksi bawah rumah di pedesaan pantai utara Jawa Tengah, yaitu: Sengon, Suren, Mahoni dan Weru. Sampel penelitian adalah 4 jenis kayu tersebut yang dijual di toko kayu kota/ kabupaten: Tegal, Pemalang, Batang, Kendal, Semarang, Demak, Jepara dan Pati. Sampel ditentukan dengan teknik random sampling jenis incidental sampling[1]. Sampel diuji berat jenis, kuat lentur dan uji ketahanan terhadap gangguan rayap bawah tanah. Data dianalisis menggunakan analisis deskriptif. Hasil penelitian menunjukkan bahwa berat jenis kayu memenuhi standar Peraturan Konstruksi Kayu Indonesia (PKKI) kecuali kayu Mahoni, kisaran kuat lentur kayu memenuhi standar PKKI dengan urutan Weru > Suren > Mahoni > Sengon, ketahanan terhadap gangguan rayap bawah tanah secara berurutan: Mahoni > Suren > Sengon > Weru[2]. Disimpulkan bahwa ketahanan terhadap gangguan rayap bawah tanah secara berurutan: Mahoni > Suren > Sengon > Weru, ketahanan tersebut berhubungan dengan berat jenis dan kuat lentur.Kata kunci: kayu Jawa, ketahanan alamiah, rayap bawah tanahAbstract: This research was held in order to know natural endurance of Javanese wood as houses building material in the coastal villages of Central Java againts underground termite’s attack. The research was carried out in laboratory of Biology Departement, FMIPA UNNES, and in laboratory of Civil Engineering Departement, FT UNNES. The study involved four  kind Javanese wood (Sengon, Suren, Mahoni and Weru) that be found in eight Central Java residence (Tegal, Pemalang, Batang, Semarang, Demak, Jepara and Pati) with incidental sampling. Specific weight test, bending strength test and endurance test carried out to four kind Javanese wood. The research resulted that  specific weight comply with PKKI standard, bending strength comply with PKKI standard and endurance againts underground termite’s attack in rotation are: Mahoni > Suren > Sengon > Weru. Based on the result it is concluded that  wood endurance againts termite’s attact be connect with specific weight and bending strength.Key words: Javanese wood, natural endurance, underground termite’s
PENERAPAN MODEL RECIPROCAL TEACHING UNTUK MENINGKATKAN PRESTASI BELAJAR BIOLOGI SISWA KELAS X DI SMAN 4 MATARAM TAHUN AJARAN 2008/2009 Dewi Maya Rinjani; Ahmad Raksun; I Putu Artayasa
Jurnal Pijar Mipa Vol. 5 No. 1 (2010): MARET
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (180.304 KB) | DOI: 10.29303/jpm.v5i1.162

Abstract

Abstrak: Penelitian ini bertujuan untuk mengetahui peningkatan prestasi belajar biologi siswa kelas X di SMAN 4 Mataram tahun ajaran 2008/2009  dengan penerapan model reciprocal teaching. Penentuan sampel menggunakan teknik cluster random sampling. Sampel penelitian adalah kelas X D sebagai kelas eksperimen dan kelas X B sebagai kelas kontrol. Penelitian dilakukan dengan mengamati aktivitas siswa menggunakan lembar observasi dan mengevaluasi menggunakan soal pilihan ganda baik pada kelas eksperimen (kelas yang menerapkan model reciprocal teaching) maupun pada kelas kontrol (menerapkan metode ceramah). Hasil penelitian menunjukkan rata-rata aktivitas siswa pada kelas eksperimen adalah 17,5 dan termasuk kategori aktif sedangkan pada kelas kontrol adalah 11,5 dan termasuk kategori kurang aktif. Nilai rata-rata hasil test kelas eksperimen sebesar 72,49 dan kelas kontrol sebesar 60,23. Hasil uji t menunjukkan bahwa perbedaan ini segnifikan pada α = 5% sehingga dapat disimpulkan bahwa model pembelajaran reciprocal teaching dapat meningkatkan prestasi belajar biologi siswa kelas X SMAN 4 Mataram tahun ajaran 2008/2009 khususnya pada konsep kegiatan manusia dan lingkungan.Kata-kata kunci: model reciprocal teching, prestasi belajar Abstarct: This research aims to know the increasing of achievement of biology learning of student grade X  in SMAN 4 Mataram academic year 2008/2009 with application of reciprocal teaching model. Sample is determined use cluster random sampling. Research sample is class X D as experiment class and class X B as control class. The Research is done by observe student activities use observe sheet and evaluate them use multiple choice in both experiment class (the class that apply reciprocal teaching model) and control class. Result of the research shows that average of student activity of experiment class is 17.5 and it is categorized as active, but in control class is 11.5 and it is categorized as less active. The average result of multiple choice test of experiment class is 72.49 and control class is 60.23. The result of t test analysis shows that difference is significant on  α = 5%  so it can be concluded that the application of reciprocal teaching model can increase the achievement of biology learning of student grade X in SMAN 4 Mataram academic year 2008/2009 especially on human activity and environmental problem concept. Key words: Reciprocal teaching model, achievement of learning.
AKTIVITAS ANTIBAKTERI METABOLIT SEKUNDER PADA KULIT BATANG GELUMPANG (Sterculia foetida L.) Maria Ulfa; Dewa Ayu Citra Rasmi
Jurnal Pijar Mipa Vol. 5 No. 1 (2010): MARET
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (212.062 KB) | DOI: 10.29303/jpm.v5i1.163

Abstract

ABSTRAK: Telah dilakukan ekstraksi dan identifikasi metabolit sekunder kulit batang Gelumpang (Sterculia foetida L.) dengan metode maserasi dan penapisan fitokimia menggunakan metode Ciulei. Kulit batang Gelumpang dimaserasi menggunakan pelarut n-heksan, DCM, metanol dan air. Gelumpang banyak digunakan sebagai obat sembelit dan encok. Untuk mendukung pemakaian secara empirik maka pada penelitian ini dilakukan uji penapisan metabolit sekunder dan uji aktivitas antibakteri terutama pada Staphyococcus aureus secara in vitro. Hasil  penapisan menunjukkan  kandungan kimia dari  ekstrak kulit batang Gelumpang adalah tanin, minyak atsiri, sterol, triterpen, kumarin dan flavonoid. Hal ini diperkuat dengan data KLT (eluen n-heksan:DCM = 8:12). Ekstrak kulit batang Gelumpang mempunyai daya antibakteri terhadap S.aureus dengan diameter daerah hambat (DDH) 2,4 mm    (n-heksan); 4,6 mm (DCM);  7,4 mm (metanol) dan 1,7 mm (air). Kata kunci; Gelumpang, Penapisan fitokimia, KLT, S. aureusABSTRACT: Extraction and identification of secondary compound Gelumpang (Sterculia    foetida L.) stem bark by maseration and screening phytochemical (Ciulei method) were carried out. Maseration using n-hexane, dichloromethane (DCM), methanol and aquadest were employed. Gelumpang are often used as traditional medicine for stomach upset or colic and  rheumatic. To support this utilization, this experiment was done to analyse the secondary compounds and to test antibacterial activity of Staphyococcus aureus. The results show that secondary compounds in Gelumpang extract were tannin, essencial oil, sterol, triterphenoid, cumarin and flavonoid. This is supported by TLC data (eluen n-hexane:DCM = 8:12). Gelumpang stem bark extract has antibacterial activity on S. aureus. This was shown by 2,4 mm (n-hexane); 4,6 mm (DCM); 7,4 mm (methanol) and 1,7 mm (aquadest) of the diameter of inhibition area.Key Words; Gelumpang, screening phytochemical, TLC, S. aureus
IMPLEMENTASI PENDEKATAN PROBLEM POSING DENGAN SETTING PEMBELAJARAN KOOPERATIF UNTUK MENINGKATKAN HASIL BELAJAR MATAKULIAH METODE NUMERIK Sri Subarinah
Jurnal Pijar Mipa Vol. 5 No. 1 (2010): MARET
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (205.816 KB) | DOI: 10.29303/jpm.v5i1.164

Abstract

Abstrak: Penelitian ini dilakukan untuk meningkatkan hasil belajar mata kuliah Metode Numerik melalui penerapan problem posing dengan setting pembelajaran kooperatif. Penelitian ini dilakukan dalam 3 siklus pada mahasiswa semester IV program studi Pendidikan Matematika FKIP Universitas Mataram tahun ajaran 2006/2007. Pada penelitian ini problem posing yang diimplementasikan dikombinasikan dengan model kooperatif saat mahasiswa menyusun problem, mencari solusi dan penyajian hasil. Pada akhir siklus ketiga, pembelajaran Metode Numerik yang menerapkan problem posing yang telah terlaksana secara optimal dengan tingkat pencapaian indikator PBM sebesar 92,4%. Hasil ini merupakan indikasi bahwa model pembelajaran problem posing dengan setting kooperatif yang diterapkan pada siklus terakhir dapat dijadikan salah satu model pembelajaran di perguruan tinggi, terutama untuk perkuliahan Metode Numerik.Kata-kata kunci : Problem posing, pembelajaran kooperatif, metode numerik Abstract: This study is done to improve learning achievement students for numerical method subject by applying problem posing approach using cooperative learning setting. This research done by three cycles for fourth semester students in Mathematics Education program study FKIP Universitas Mataram 2006/2007. In this research, The students construct problems, solve problems and present the result of discussion in cooperatively. At the last cycle, problem posing model was implemented optimally with 92.4% indicator satisfied. This result indicates that problem posing implemented in the last cycle can be made as one of instruction model in university, especially for numerical method subject.Keywords: problem posing, cooperative learning, numerical method
PENERAPAN PEMBELAJARAN KOOPERATIF TIPE STAD UNTUK MENINGKATAN AKTIVITAS BELAJAR DAN HASIL BELAJAR ILMU KIMIA SISWA SMAN 1 NATAR LAMPUNG SELATAN Dwi Yulianti
Jurnal Pijar Mipa Vol. 5 No. 1 (2010): MARET
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (156.303 KB) | DOI: 10.29303/jpm.v5i1.165

Abstract

Abstrak: Tujuan penelitian ini adalah untuk membelajarkan siswa dengan pembelajaran kooperatif tipe STAD guna meningkatkan aktivitas belajar siswa, hasil belajar kognitif siswa, dan persentase jumlah siswa yang mendapat skor hasil belajar di atas 64 siswa kelas X.2 dan X.3 di SMAN 1 Natar Lampung Selatan. Untuk mencapai tujuan penelitian dilakukan penelitian tindakan kelas pada kelas X.2 dan X.3 di SMAN 1 Natar Lampung Selatan. Penelitian dilakukan sebanyak tiga siklus pada tahun pembelajaran 2005/2006. Tahap-tahap tindakan yang dilakukan pada setiap siklus dimulai dari: 1) tahap perencanaan tindakan, 2) tahap pelaksanaan tindakan dan observasi, 3) evaluasi, dan 4) refleksi. Indikator keberhasilan tindakan adalah: 1) ada peningkatan aktivitas belajar sebesar 5 persen, 2) ada peningkatan rerata hasil belajar kognitif sebesar 5 angka (skor) dibandingkan dengan hasil belajar kognitif pada siklus sebelumnya, dan 3) ada peningkatan persentase jumlah siswa yang memperoleh skor di atas 64, sebesar minimal 5 persen dari siklus ke siklus. Berdasarkan hasil analisis data diketahui bahwa: 1) peningkatan aktivitas belajar dari siklus satu ke siklus dua berada antara 2,76% sampai 10,71%, dan peningkatan aktivitas belajar dari siklus dua ke siklus tiga berada antara 0,21% sampai 4,48%, 2) peningkatan rerata skor hasil belajar dari siklus 1 ke siklus 2 sebesar 6,39 angka, dan peningkatan rerata skor hasil belajar dari siklus 2 ke siklus 3 sebesar 6,29, dan 3) peningkatan persentase siswa yang memperoleh skor >64 dari siklus satu ke siklus dua sebesar 6,06%, dan peningkatan persentase siswa yang memperoleh skor  >64 dari siklus dua ke siklus tiga sebesar 8,85%. Kesimpulan penelitian ini adalah bahwa pembelajaran kooperatif tipe STAD dapat meningkatkan aktivitas belajar siswa, meningkatkan hasil belajar kognitif siswa, dan sekaligus meningkatkan persentase jumlah siswa yang mendapat skor hasil belajar di atas 64 siswa kelas X.2 dan X.3  di SMAN 1 Natar Lampung Selatan.Kata kunci : strategi mengajar, pembelajaran kooperatif, penelitian tindakan kelas, hasil belajar Abstract: The purpose of this study is to facilitate students to learn with the STAD type of cooperative learning in order to improve students' learning activities, enhance students’ cognitive achievements, and increase the percentage of students who obtained a score above 64 of students classroom X.2 and X.3 at SMAN 1 Natar South Lampung . To achieve the goals of the research conducted classroom action research on classroom X.2 and X.3 at SMAN 1 Natar South Lampung. Research was conducted for three cycles of the academic year 2005/2006. Stages of the action taken on each cycle starts from: 1) the action planning phase, 2) phase of the implementation of actions and observations, 3) evaluation, and 4) reflection. Indicators were measures of success: 1) an increase of five per cent of learning activities, 2) an increasing cognitive achievements mean of five digits (score) compared with the cognitive achievements in the previous cycle, and 3) an increasing percentage of the number of students who obtained a score above 64, for a minimum of 5 percent from cycle to cycle. Based on the results of data analysis found that: 1) there was an increased in activity of learning from first cycle to second cycle were between 2.76% to 10.71%, and an increased in activity cycle of learning from second to third cycles were between 0.21% to 4.48 %, 2) there was an increased in mean score of learning outcome from first cycle to second cycle of 6.39 points, and an improved in mean score of achievements from second cycle to third cycle for 6.29, and 3) there was an increased the percentage of students who obtained a score above 64 from first cycle to second cycles of 6.06%, and an increased the percentage of students obtained a score above 64 from second cycle to third cycles of 8.85%. The conclusion of this study is that type STAD cooperative learning can improved students’ learning activities, enhanced students' cognitive achievements, and increased the percentage of students who obtained score above 64 of students achievements at classroom X.2 and X.3 SMAN 1 Natar South Lampung.   Keywords:   teaching strategy, cooperative learning, classroom action research, cognitive achievement.

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