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BERKALA FISIKA
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
BERKALA FISIKA adalah jurnal saintifik yang diterbitkan secara periodik 3 bulanan. Jurnal ini memuat kajian-kajian Fisika baik kajian teoretik maupun hasil eksperimen. Jurnal ini juga memberi ruang yang luas bagi kajian – kajian aplikasi fisika dalam bidang teknologi, ilmu-ilmu hayati dan kedokteran.
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Articles 30 Documents
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Search results for , issue "Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus" : 30 Documents clear
Pengaruh Format Soal Dalam Bentuk Animasi Terhadap Validitas Dan Reliabilitas Tes Pemahaman Konsep Pembiasan Cahaya Suhandi, Andi; Samsudin, Achmad; Setyawan, Agus
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
Publisher : BERKALA FISIKA

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Abstract

This research was conducted to investigate the influence of question format in the form of animation to the validity and reliability tests of understanding the concept of light refraction. For the sake of it has constructed a test of understanding the concept of the refraction of light in an animation format by replacing static pictures and descriptions of the phenomenon of refraction of light propagation in a static format (paper and pencil test) with computer animation. Second test version, the version animated and static versions then tested to 100 students from three high schools in Bandung, which has received the learning material of light refraction. The second test version of the test results are then analyzed to determine the validity and reliability respectively. To see the influence of a test version of the level of validity and reliability, then compare the level of validity and reliability of both versions of this test. The results showed that both the level of validity and reliability tests in levels higher than the animated version of the test in the static version. Level of validity for the second consecutive test version 0.89 (very high) for an animated version and 0.71 (high) for the static version, whereas the level of reliability, 0.92 (very high) for an animated version and 0.78 (high ) for the static version. These results show obvious evidence of the influence of question format in the form of animation on the level of validity and reliability tests of understanding the concept of habituation of light. Keywords: Animation Test Version, Test Version Static, validity, reliability, refraction of light
Penerapan Film Tipis Ba0.25Sr0.75TiO3 (BST) Yang Didadah Ferium Oksida Sebagai Sensor Suhu Berbantukan Mikrokontroler Ardian, A.; Nady, L.; Erviansyah, R.; Syafutra, H.; Irzaman, Irzaman; Siswadi, Siswadi
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Ferroelectric material originating from Barium Strontium Titanate (BST), is expected to have high energy because it has a dielectric constant and high charge storage capacity [6]. Materials produced by the process of ferium dopan, it is hoped will be a temperature sensor. If, materials BST and BFST (Barium Ferium Strontium Titanate) subjected to the temperature (material change that temperature), and the resulting voltage, then this material can be applied as a temperature sensor using a microcontroller. Microcontroller that used is ATMega 8535 with internal ADC. Voltage was generated, will be reinforced with a voltage amplifier (OpAmp) and will be processed into digital data at the ATMega8535 internal ADC (Analog Digital Converter).Incoming digital data will be processed and displayed in the view Microcontroller-based desktop applications Delphi 7. The material to be tested is material BST, BFST 5%, and BFST 15%.   Keyword: BST, Temperature sensor, ATMEGA 8535, ADC, Delphi 7
Arus Terobosan Pada Transistor Dwikutub Struktur Hetero Si/Si1-xGex/Si Anisotropik Melewati Basis Tergradasi (Graded Base) Hasanah, Lilik; Khairurrijal, Khairurrijal
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Tunneling current in bipolar transistors Si/Si1-xGex/Si anisotropic hetero structure for germanium conditions on a constant basis is not analyzed here. The concentration of germanium in the base which is not constant will result in the potential profile at the base is not flat, but will be graded according to the germanium concentration. Tunneling current calculation is performed semi-analytically and numerically. The calculation result obtained then matched with experimental data. The results show that the results of analytical calculations with results of semi-numerical calculations. While analytical calculations with experimental data only flows from the VBE 0.3 to 0.6 V.   Keywords: Tunneling current, germanium concentration, anisotropic material, transfer matrix method, hetero structure bipolar transistor
Koreksi Gaya Berat Akibat Curah Hujan Pada Pengukuran Gaya Berat Mikro Antar-Waktu Lapangan Panas Bumi Kamojang 2006-2007 Zaenudin, Ahmad
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Shallow groundwater level changes cause seasonal gravity anomaly. Changes in groundwater level is directly related to rainfall, when heavy rainfall, groundwater level rises rapidly and then declined gradually. Gravity anomaly due to the season is important to take into account noise. Changes in groundwater level due to rainfall is calculated using empirical equations, and the Gravity response calculated using the approach of an infinite Bouguer slab correction by entering the porosity factor. The rainy season in the Kamojang geothermal field occur between November to June and dry season between July to October. The highest rainfall in 24 hours occurred on December 8 by 75 mm. From the empirical calculations showed that changes in groundwater level due to rainfall period November 2006-June 2006 amounted to -1.502 m and July 2007-June 2006 amounted to +0.396 m. Based on the approach slab Bouguer corrected gravity anomaly not to cause inter-time respectively -18.89 and +5.98 mikrogal mikrogal for porosity of 30%. Changes in groundwater level is negative (a reduction of groundwater) caused gravity anomaly time inter-negative, and vice versa. Correction of the gravity anomaly due to inter-time rainfall should not be ignored because of the gravity anomaly at the time inter-geothermal field is usually small.   Key words: rainfall, groundwater level, inter-period gravity anomaly
Analisis Korelasi Kondisi Pembuatan Film Tipis Polipropilen (PP) dan Sifat-Sifat Mekaniknya Dengan Metode Uji Tarik Kartika Sari; Rahmat Satoto
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Condition Correlation Analysis of Thin Film Polypropylene (PP) and Attributes Mechanical Tensile Testing Method has been performed in Polymer Test Lab located at LIPI Bandung. This study aims to examine the relationship between the manufacture of thin film with a three-siftat sisitem cooling and mechanical properties. Sample material used is Polypropylene (PP) Y101XX grain pellets. Then the material is arranged on the aluminum frame of the heating plate and plastic transparencies of six samples. Such materials will be heated with two variations of temperature at the same time given the pressure by using the hot press Gonno-02 326 at 175oC and 225oC and given three different treatment when the cooling process that is in the chill with ice water (quenching), in the chill on cold press and cooled until it reaches room temperature by turning off the heater. Samples that have formed a thin film forming dipotopng Dumbbell type ISO 527-2. Of the six films produced by two samples with different cooling systems made seven Dumbbell. Then Dumbbell-dumbbell was conducted testing of mechanical properties by measuring the strain, stress and elastic modulus using a tensile test using a Universal Tensile Tester.   Keywords: Polypropylene (PP), Thin Film, Universal Tensile Tester  
Model Panel Surya Cerdas Dengan Sensor Pelacak Cahaya Matahari Otomatis Berbasis Mikrokontroler Harjunowibowo, Dewanto
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

This research aims to create a model of intelligent solar panels are able to follow the movement direction of the sun as an energy source based on microcontroller AVR ATMEGA. This study uses ATMEGA AVR microcontroller 16bit with injection of fuzzy logic programs. The system also created using 4 (four) sensors LDR and 5 (five) photodiode sensor. Integration of fuzzy logic, AVR ATMEGA and sensors capable of providing optimal results into a dynamic model of the solar panels that automatically and can be applied on a large scale. The results of this study is a prototype solar panel that is able to follow the movement direction of the sun based on microcontroller AVR ATMEGA 16. The solar panels model is capable of putting solar panel surface perpendicular to the direction of sunlight intensity can be detected along the sensor.   Keywords: smart panel, microcontroller, fuzzy logic, sensor
Desain Model Pembelajaran Untuk Meningkatkan Kemampuan Pemecahan Masalah Dalam Pembelajaran IPA (Fisika) Sekolah Menengah Pertama Di Kota Bandung Taufik, Mohammad; Sukmadinata, Sukmadinata; Abdulhak, Ishak; Y. Tumbelaka, Bernard
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Penelitian ini dilatarbelakangi oleh masih rendahnya literasi sains yang mencakup kerja ilmiah dan kemampuan pemecahan masalah khususnya pada mata palajaran IPA (Fisika). Melalui penelitian ini dikaji permasalahan yaitu bagaimana model pembelajaran yang dapat diterapkan untuk meningkatkan kemampuan pemecahan masalah dalam pembelajaran IPA (Fisika) di SMP. Tujuan penelitian adalah untuk mendesain model pembelajaran yang dapat diterapkan dalam meningkatkan kemampuan pemecahan masalah pada mata pelajaran IPA (Fisika) di SMP kelas VIII. Penelitian dilaksanakan di SMP di Kota Bandung menggunakan pendekatan research and development. Proses dilaksanakan melalui tahapan: studi pendahuluan untuk mendapatkan landasan pengembangan model dan pengembangan untuk mendapatkan model hipotetik melalui dua kali ujicoba. Berdasarkan penelitian ini diperoleh simpulan: Pertama, model pembelajaran Peningkatan Kemampuan Pemecahan Masalah (PKPM) dapat diterapkan pada mata pelajaran IPA (Fisika) di SMP kelas VIII dengan karakteristik materi pelajaran bersifat kontekstual dalam bentuk masalah yang harus dipecahkan melalui eksperimen. Metode pembelajaran yang digunakan menempatkan siswa sebagai subjek belajar serta guru sebagai fasilitator belajar. Interaksi pembelajaran dilaksanakan melalui tanya-jawab, penyelidikan/eksperimen, kolaboratif, dan latihan. Implementasi model meliputi: (1) Pendahuluan yang meliputi penjelasan singkat tentang tujuan dan proses pembelajaran, pengembangan suasana partisipatif, orientasi masalah kontekstual, dan pengorganisasian siswa; (2) Inti yang meliputi penyelidikan/eksperimen kolaboratif, penyajian hasil karya, pemberian penghargaan, dan latihan pemecahan masalah; serta (3) Penutup yang meliputi analisis dan evaluasi proses pemecahan masalah dalam bentuk refleksi serta rekonstruksi pemikiran dan aktivitas proses pembelajaran. Kedua, implementasi model pembelajaran PKPM merupakan salah satu upaya yang dapat digunakan untuk memperbaiki kualitas proses dan hasil pembelajaran IPA (Fisika) di SMP kelas VIII. Dampak penggunaan model tersebut antara lain: (1) Meningkatnya peran siswa dalam pembelajaran dan membuka peluang bagi siswa untuk melakukan kerja ilmiah; serta (2) Peningkatan kemampuan pemecahan masalah, penguasaan konsep, dan menumbuhkan kebiasaan berpikir dalam menyikapi masalah.   Kata kunci: Model Pembelajaran, Peningkatan Kemampuan Pemecahan Masalah, Konstruktivisme, Berpikir Reflektif.
Karakterisasi Dinamika Tingkat Tenaga Eksitasi 2Ag- Pada Karotenoid Spheroidene Menggunakan Spektroskopi Ultra Cepat Pisah Waktu Novita, Mega; Mangimbulude, Jubhar; S. Rondonuwu, Ferdy
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Poliena adalah rantai karbon dengan ikatan rangkap dan tunggal yang saling berutan. PPP-MRD-CI mempredikasikan bahwa rantai-rantai pendek poliena memiliki struktur energi dengan tingkatan 1Ag- > 2Ag- > 1Bu+.  Waktu hidup tingkat tenaga eksitasi 2Ag- dan 1Bu+  pada poliena berada pada orde pikodetik – nanodetik tergantung pada panjang rantainya. Karotenoid sering dimodelkan sebagai rantai poliena dengan struktur energi yang sama. Paper ini membahas dinamika tingkat tenaga 2Ag- karotenoid spheroidene dalam pelarut n-hexane menggunakan spektroskopi ultra cepat pisah waktu. Didapati bahwa waktu hidup tingkat tenaga 2Ag- karotenoid spheroidene sekitar 9 pikodetik, dan sedikit bervariasi tergantung tingkat vibrasinya. Kata kunci: spheroidene, struktur energi, waktu hidup, spektroskopi
Kajian Hasil Pembuatan Tiga Macam Ukuran Lubang Berbentuk Persegi Panjang Pada Tubuh Tungku Sekam Darmasetiawan, H.; Irzaman, Irzaman; Demijati, Demijati; Siswadi, Siswadi
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Husk furnace is used for cooking fuel chaff with the aid of air flow in the furnace. One measurement of the husk furnace efficiency can be studied by varying the size of the primary air holes on the body of the furnace. In this study, a hole measuring 22 cm X 24 cm obtained by the rate of fuel consumption of 6.03 kg / hour of heat energy needed to boil water as much as 6 liters is 2575.00 kcal / h and 14.32% efficiency furnace. While in the hole measuring 22 cm X 8 cm and 22 cm X 16 cm, respectively 12.92% and 12.87% efficiency furnace, not significantly different.   Keywords: chaff, husk furnace, ukuruan primary air hole, furnace efficiency
Persamaan Fokker Planck dan Aplikasinya Dalam Astrofisika Palupi, Dwi Satya
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Abstract It has been established Fokker-Planck equation to obtain the evolution of particle distribution functions that describe the motion of particles in a fluid that can not be described by the Liouville equation. Fokker-Planck equation contains a diffusion component particles and the interaction between the particles will be discussed application of Fokker-Planck equation in astrophysics since the plasma in the form of interstellar space so that there is interaction between the particles making up the plasma.   Keywords: Fokker-Planck, plasma, astrophysics

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