Articles

Pengaruh Format Soal Dalam Bentuk Animasi Terhadap Validitas Dan Reliabilitas Tes Pemahaman Konsep Pembiasan Cahaya

BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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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

VERTICAL TRANSVERS ISOTROPY (VTI) PRE STACK DEPTH MIGRATION ANISOTROPI UNTUK PENCITRAAN STRUKTUR BAWAH PERMUKAAN YANG LEBIH AKURAT

YOUNGSTER PHYSICS JOURNAL Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012
Publisher : YOUNGSTER PHYSICS JOURNAL

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Anisotropic Pre Stack Depth Migration method has been carried out for 2D seismic reflection data on Line “IR” The simplest form of anisotropic media (VTI (Vertical Transverse Isotropy) was used. Theoretically, this form requires two parameters to describe the media, those are δ (delta) and ε (epsilon). δ is an anisotropy parameter that describe velocity variation near to vertical while ε is an anisotropy parameter that describe velocity variation near to horizontal. The anisotropic Pre Stack Depth Migration produce a section which has corrected build up image and has change to be the true of reflector in 67 m of depth. Base on well and seismic data calculation process, an anisotropic parameter is in the range of 0.050-0.058. Generally, Anisotropy Pre Stack Depth Migration method gave better result than isotropy Pre Stack Depth Migration. Key Word: Anisotropy, Pre Stack Depth Migration, VTI, delta, epsilon

INVERSI AMPLITUDE VERSUS OFFSET UNTUK MENGETAHUI PENYEBARAN HIDROKARBON Di LAPANGAN “X”

YOUNGSTER PHYSICS JOURNAL Vol 2, No 2 (2013): Youngster Physics Journal April 2013
Publisher : YOUNGSTER PHYSICS JOURNAL

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Inversion of AVO (Amplitude Versus Offset) can be used to identify and maping the spread of hydrocarbons on seismic data. The research was conducted on the field "X" TAF layer Talang Akar’s  formation’s  North West Java basin. AVO inversion performed to obtain angle stack, intercept, gradient and fluid factor attribute. The results of the angle stack analysis indicate AVO anomaly in TAF layer’s. Based on the crossplot between the intercept with the gradient, TAFlayer’s included in Class III AVO anomaly. The results of fluid factor analysis showed TAF layer’s has a negative value, that is estimated to have hydrocarbon potential Key words: Amplitude Versus Offset (AVO),angle stack, intercept, gradient, fluid factor.

ANALISA DATA CURAH HUJAN STASIUN KLIMATOLOGI SEMARANG DENGAN MODEL JARINGAN SYARAF TIRUAN

BERKALA FISIKA Vol 15, No 1 (2012): Berkala Fisika
Publisher : BERKALA FISIKA

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The major purpose of this research was to applying artificial neural network to predicting rainfall in Semarang climatology station and occurs its accuration. One ofartificial neural network method is back propagation artificial neural network. Withheuristic technique its optimizing to train algorithmic faster and improving net works. Weused rainfall data in 2000-2009 from Semarang climatology station. Artificial neuralnetwork modelling planned in MATLAB R2008b programme. The best model or net viewsfrom correlation level between net’s output, observation data and RMSE point whichproduced by the net. The results shown the best network has 5 neurons in input’s layer, 10in hidden layer and 1 neuron in output layer. Its performance has learning data 66,7%,testing data 33,3%, learning rate 0,7 and momentum 0,4 which has correlated around70,72% to observation data with RMSE point 141,55. The best network will use topredicting rainfalls in 2010, its correlation is 88,43% and its RMSE points is 83,76 tillJuly. Its better than what BMKG has which only reach 84,63% correlation points and87,21 RMSE points.Keywords:  Artificial neural network, optimizing, correlation, RMSE

MODEL ARIMA UNTUK PREDIKSI CURAH HUJAN STUDI KASUS SEMARANG JATENG

BERKALA FISIKA Vol 15, No 3 (2012): Berkala Fisika
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Modeling and prediction of rainfall in 2010 in Central Java BMKG Climatological Station has been done with ARIMA approach. The goal is to determine the historical pattern of the dataand then extrapolates this pattern into the future based on the assumption of continuity. Rainfalldata of 2000-2009 is a time series that can be predicted into the future using ARIMA. In thisstudy using two approaches for prediction of rainfall in 2010. The results were correlated with aprediction of rainfall data observed in 2010. Obtained a correlation of 71.1% and 75.48%.Keywords: ARIMA, rainfall, predictions, models

IDENTIFIKASI ALIRAN AIR INJEKSI DI LAPANGAN TALANG JIMAR REGION SUMATRA MENGGUNAKAN METODE SPONTANEOUS POTENTIAL

BERKALA FISIKA Vol 15, No 3 (2012): Berkala Fisika
Publisher : BERKALA FISIKA

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Spontaneous-potential observation using amplitude potential method had been done beneathTalang Jimar area. The purpose of observation are to determine the distribution and depth of fluidinjection. Spontaneous-potential which has been corrected then processed using excel and surfer 9 toknow the distibution of its spread, while for the clarified of the deph we used spherical model. Thespontaneous-potential result shows ranging from -40 mV up to 10 mV with direction towards thereference block and a depth of 244,93 meters show.Keywords : Spontaneous‐potential, fluid injection, Talang Jimar, spherical model.

Analisis Non Linier Tegangan Dan Deformasi Struktur Jembatan Beton Prategang Pada Tahap Konstruksi Dengan Metode Balanced Cantilever

Wacana - Journal Fakultas Teknik Sipil dan Perencanaan Vol 13, No 2 (2012): Wacana September 2012
Publisher : Wacana - Journal Fakultas Teknik Sipil dan Perencanaan

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Prestressed concrete bridge structure under construction phase using the balanced cantilever method is widely used in the construction of bridge structure. The method is suitable method for the eretion of long span segmental bridges. Balanced cantilever method is developed to minimize the need of scaffolding as the implementation of in-situ casting. However, it is requered  to consider the stress and  deformation which may  occur. This might happen because of the difference of the concrete strength at each concrete segment connected to the last segment of the bridge. Realistic approach can be performed numerically by non-linear finite element analysis  by using  ATENA software. The objective of this study is to determine and compare the stress and deformation which occur in prestressed concrete bridge structures by using the balanced cantilever method based on the non-linear and linear analysis. This study reviewed the bridge of Tol Semarang - Solo (Span A1 - P1 - A2, Banyumanik I). This bridge was half-spans  numerically modelled by using assumption of fixed pier placement (boundary condition). The numerical models bridge box girder were analyzed using the ATENA software. The  results of the this study were then  compared to the results of linear analysis of SAP 2000 software by Primajaya (2010). Further research on the maximum load and deflection of the cantilever box girder bridge structure was done until the collapse. The results showed the comparison  non-linear and linear of analysis by the ATENA software and SAP 2000 software. The result showed the same maximum stresses occurred  on the segment I of the bridge structure for both analyses. The differences of the results on both analyzes stresses of the top sides for  condition  1/3 span, 2/3 span and full span we e 0,736 MPa, 2,353 MPa, 0,009 MPa, respectively. On the bottom side the differences were 0,284 MPa, 0,878 MPa, 2,518 MPa. Maximum load that can be held bridge structures during the balance cantilever was 360 KN at the free end of the balance cantilever with deflection of 180 mm by the time of the collapse.   Keyword—  stress, deformation, balanced cantilever.

ANALISA PERSEBARAN LITOLOGI SANDSTONE PADA FORMASI TALANG AKAR MENGGUNAKAN INVERSI EXTENDED ELASTIC IMPEDANCE (EEI) DI LAPANGAN CILAMAYA, CEKUNGAN JAWA BARAT UTARA

YOUNGSTER PHYSICS JOURNAL Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : YOUNGSTER PHYSICS JOURNAL

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Extended Elastic Impedance (EEI) inversion method has been used to analyze sandstone lithology distribution of Talang Akar Formation in Cilamaya Field, North West Java Basin. The target zone was Z2230 layer which located in Talang Akar Formation with litologies of sandstone and shale. Sensitivity analysis showed that gamma-ray and density are sensitive to discriminate the type of lithologies in Z2230 target layer. EEI(58) could simulate gamma-ray and EEI(12) could simulate density with respectively 0,397 and 0,613 correlation values. EEI(12) inversion result showed sandstone lithology distribution in Z2230 layer with 8800 to 9800 . Sandstone lithology distribution concentrated in northwest–southeast of study area. There was hydrocarbon prospect area in north of well OTR-10.Keywords : Extended Elastic Impedance (EEI), gamma-ray, density, sandstone 

PENENTUAN PREKURSOR GEMPA BUMI MENGGUNAKAN DATA MAGNETOTELLURIK DI DAERAH PELABUHAN RATU

YOUNGSTER PHYSICS JOURNAL Vol 2, No 3 (2013): Youngster Physics Journal Juli 2013
Publisher : YOUNGSTER PHYSICS JOURNAL

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The research has been done by using data of electromagnetic parameter base on the result of magnetotelluric observation which  located in geophysics observation Pelabuhan Ratu. Research of earthquake precursor in order to find out the characteristic of electromagnetic signal by applying spectral analysis ratio method on Ultra Low Frequency (ULF).             The data is electromagnetic secondary data from observation result of magnetotelluric and data of Dst index year 2011.  The data magnetotelluric is consist of electric component and magneict component. The filtering data is executed by using wavelet method. Result of  filtering  will be shown as graph ratio of magnetic field and electric field spectral intensity in a time domain.            According to the analysis by using spectral density analysis can be found out that the characteristic of ULF signal on frequency 0.01 Hz before earthquake show that there is an increase of value for magnetic polarization and occurred decrease of EM wave impedance value. From the analysis result show an appearance of magnetic polarization anomaly which expected as earthquake precursor and can be seen around 10 – 19 days before the occurrence of earthquake while for the value of EM wave impedance can be seen around 23 – 40 days before earthquake.Keywords : Precursor, Ultra-Low-Frequency, Spectral Density Ratio Analysis, Pelabuhan Ratu

APLIKASI METODE BIDIMENSIONAL EMPERICAL MODE DECOMPOSITION (BEMD) UNTUK DATA GAYABERAT GUNUNG UNGARAN, INDONESIA

YOUNGSTER PHYSICS JOURNAL Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : YOUNGSTER PHYSICS JOURNAL

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Gravity method processing will obtained gravity anomaly which is combination between regional and local gravity anomalies that need to separate it for interpretation. Upward continuation method commonly used to separates regional and local gravity anomalies. Recently, the separation of these anomalies can be done with Bidimensional Empirical Mode Decomposition (BEMD) method which its calculation based on gravity anomaly profile. BEMD will separates gravity anomali profile based on its frequency that some sub-sinyal will obtained from it. On this research, BEMD method has been used to separate gravity anomaly of Ungaran Mountain dan the result of it compared with the result from Upward Continuation method. 5 Intrinsic Mode Function (IMF) and 1 residual were obtained from BEMD method, wherein IMF3 showed pattern of regional gravity anomali and IMF1 showed pattern of local gravity anomaly. With using these methods, obtained patterns were similar. Keywords: BEMD, Gravity anomalies, Ungaran, IMF

Co-Authors Achmad Samsudin Agnis Triahadin Agnis Triahadini, Agnis Agus Subagio Ali Husni Aliyatarrafiah Aliyatarrafiah Andhika Prima Prasetyo Andi Suhandi Apriyanto, Herman Azwar Ibrahim Bagiyono Bagiyono Bambang Mujihardi, Bambang Berta Putri Boko Nurdiyanto D Febrianty Dewi Mariyaningsih Dhana Hastuti, Dhana Dian Agus Widiarso Dimas Sidiq Baskoro, Dimas Sidiq Dita Aprilina Djalal Er Riyanto Duto Nugroho, Duto Dwiyanto JS, Dwiyanto Endriasmoro M Siagaan Esti Harpeni Eva Susanti F M Arif Faizah, Ria Faizal Ahmad, Faizal Fajar Waskito, Fajar Fauzy, Ahmad Fitra Ramdhani, Fitra Florentina Yuni Arini, Florentina Yuni Frysca Putti Muviana, Frysca Putti Fuad Tarmidzi Galang Virgiawan, Galang Ganap Yuliana Febrika, Ganap Yuliana Gunawan Gunawan Handoyo, Muhammad Nur Hardiyani, Sera Harri Yudianto Hauzan, Noor Azmi Fachri Heru Tjahjana Hirafiany Daruartati, Hirafiany Ibnu Rasid Ilham Nurdien, Ilham Imam Baru Raharjo Iqbal Hamdani, Muhammad Dima Isa Akhlis Istiqomah Ari Kusuma, Istiqomah Ari Jatmiko Endro Suseno Kusno Adi Sambowo M Wildan Firdaus, M Wildan Mahmud Yusuf Mochammad Abdul Mukid, Mochammad Abdul Mohammed I. D. Matar, Mohammed Mualimin Mualimin Muchammad A Rofik Muhammad Mualimin Muhammad Nur Muhammad Nur Handoyo Muhammad, Mualimin Murtiningtias Diah Ayu Martha Dewi, Murtiningtias Diah Ayu Martha Mustafid Mustafid Ningsih, Ajeng Angrum Nona Dili Maricci, Nona Dili Noviana Fransiska Nur Rachmaningtias Nurma Jana Hazzulli Nursamsiah Nursamsiah Nur`Ani Okta Trilia Octaviani Sarmauli, Octaviani Oki Hedriana, Oki Oky Irawan Sugiri Ophi Thio Rendy Purwoko, Rudy Masuswo Rahmat Gernowo Rahmat Yulianto Rara Diantari Ratih Rundri Utami, Ratih Rundri Ria Hindra Sari Rina Hesti Utami Rinda Aryani Putri Ririn Sulpiani Sadiyah, Lilis Sari, Febrina Satriyo Adhy Septi Diana Sari, Septi Diana Siti Hudaidah Sudarno Sudarno Sugeng Widada Suhartono Suhartono Sumino, Sumino Suparmono - Supono Supono Supriyadi - Tarsim - Teguh Suroso Tony Yulianto Tri Handayani Udi Harmoko Wardiyanto - Wardiyato, Wardiyato widowati widowati Winaldi, Iman Wisnu Agung Permadi, Wisnu Agung Yatti Pratyas Katrinavia, Yatti Yayan Yuliananto Yoga Aribowo Yudha T Adiputra Yudha Trinoegraha Adipura Yudha Trinugraha Adiputra Zulfikar Zafeskan Ronapati