Spektra: Jurnal Fisika dan Aplikasinya
Not a member yet
254 research outputs found
Sort by
STUDI BRANEWORLD DIMENSI LIMA
Get PDFAbstrak
Studi yang berkaitan dengan braneworld dimensi lima dengan brane tunggal yang terletak di telah diakukan, model Randall-Sundrum dan modifikasi Randall-Sundrum. Aspek yang ditinjau adalah skalar Ricci, persamaan Einstein, tensor energi-momentum, konsanta kosmologi dan massa Planck efektif dalam dimensi-empat. Dari ekspresi skalar Ricci dan analisis persamaan medan Einstein pada brane dan bulk dapat diinterpretasikan bahwa kedua metrik memiliki ruang-waktu yang berbeda.
Kata-kata kunci: Brane-world, Dimensi Ekstra, Model Randall-Sundrum, Model Modifikasi RandallSundrum.
Abstract
The five-dimensional braneworld models with single brane placed at have been studied, Randall-Sundrum model and a Modified Randall-Sundrum model. In this case, in terms of Ricci scalar, Einstein equations and energy-momentum tensor, cosmological constant and four-dimensional Planck efective mass have been investigated. From the Ricci scalar and Einstein equation expressions both on brane and bulk indicate that those metrics have different space-time.
Keywords: Brane-world, Extra Dimension, Randall-Sundrum Model, Modified Randall-Sundrum Model. 
DISTRIBUSI SPASIAL DENSITAS CAKRAM BERUKURAN SAMA DALAM PEMODELAN PEMBENTUKAN ASTEROID
Get PDFSeveral two-dimension particles in the form of a disk, which only interact through gravitational force and normal force, are simulated. Assumed that there are only two values of particle density (same diameter but different mass). Simulation are conducted until particles position are slightly constant. It is obtained that density is varied radially, decreasing with an increase of radial position, and nearly isotropic angularly in final condition. It has been simulated N = 64 particles with mass ratio mA/mB = 0.25 for 944 s simulation time.
Keywords: asteroid forming, granular material, density distribution, binary mixtur
KARAKTERISASI SENSOR PHOTODIODA, DS18B20, DAN KONDUKTIVITAS PADA RANCANG BANGUN SISTEM DETEKSI KEKERUHAN DAN JUMLAH ZAT PADAT TERLARUT DALAM AIR
Get PDFAbstract
Drinking water worth consumption are those that should be odorless, tasteless, clean, the temperatures preferably below air temperature, and low amounts of dissolved solids. On this turbidity and total dissolved solid water system is required some sensor devices. The accuracy of the sensor is an important thing to support the effectiveness of the system. In this research, the calibration of ds18b20 sensor as temperature detector, photodiode sensor as turbidity detector, and conductivity sensor as a detector of dissolved solid (TDS) in water and using Arduino as a microcontroller. The characterization is done by comparing the sensor output with laboratory test equipment. The result of characterization means that each measurement sensor has a variation error that is photodiode sensor with relative error 3.13%, sensor ds18b20 1.77%, and conductivity sensor 2.42%.
Keywords: temperature, turbidity, TDS, Arduino
PENGEMBANGAN ALAT PERAGA BINTIK MATAHARI MENGGUNAKAN LED BERBASIS ARDUINO
Get PDFAbstrak
Bintik matahari yang terjadi dalam kehidupan sehari-hari merupakan hal menarik untuk divisualisasikan melalui alat peraga dalam proses belajar menganjar. Alat peraga bintik matahari menggunakan software Arduino dilengkapi oleh lampu LED pada alat peraga tersebut. Perhitungan periode rotasi diketahai melalui jejak-jejak bintik matahari sehingga dapat divisualisasikan oleh alat peraga bintik matahari berdasarkan data tanggal jejak bintik matahari tersebut. Peneliti membatasi tanggal jejak bintik matahari selama 8 hari terhitung dari tanggal 6 Oktober 2016 sampai 13 Oktober 2016. Penggabungan jejak bintik matahari dari tanggal 6 Oktober 2016 sampai 12 Oktober 2016 (7 hari) dan tanggal 7 Oktober 2016 sampai 13 Oktober 2016 (7 hari) menghasilkan data I dan data II. Perhitungan hasil periode rotasi matahari pada data A dan data B adalah sama 28 hari sehingga divisualisasikan kedalam alat peraga bintik matahari. Alat peraga beroperasi dengan baik terlihat dari lampu LED pada alat peraga menyala/mati sesuai perintah program Arduino dengan tampilan serial monitor.
Kata-kata kunci: Alat Peraga, Bintik Matahari, Arduino
Abstract
Sunspots in daily life is an interesting object to be visualized into an instrument applied in the teaching and learning process. The sunspots instrument applied Arduino software completed with LED light. The calculation of the periodic of rotation was discovered through the sunspots traces, so that it could be visualized by the sunspots instrument based on the sunspots traces. The researcher limited the date of the sunspots traces into 8 days ,started from October, 6th 2016 until October, 13th 2016. The merging of sunspots traces started from October 6th 2016 until October 12th 2016 ( 7 days) and at the date of October 7th 2016 until October 13th 2016 (7 days ) produced data I and data II. The calculation result of the sun periodic of rotation were equally 28 days, so that it could be visualized into the sunspots instrument. The instrument was successfully operated, indicated from the LED light which was turning on and off accordingly to the instructions of the Arduino program with the display of serial monitor.Keywords : Instrument, Sunspots, Arduino
Keywords: Instrument, Sunspots, Arduin
SIFAT MEKANIK BAHAN KOMPOSIT KAMPAS REM BERBAHAN DASAR SERBUK ARANG KULIT BUAH MAHONI
Get PDFMahogany bark is one of natural material which not used optimally in society. The overabundance of mahogany bark appearing new problem of garbage which charges an alternative solution creatively and innovatively becomes a new efficient and effective product. An alternative solution of mahogany bark utilization is as organic composite material of disk brake. The making of organic composite material of brake disk firstly is reducing the mahogany bark becomes a homogeneous carbon powder. The mahogany bark was smoked being of carbon and mixed with coconut shell and resin polyester as an adhesive. The organic composite material was produced, tested by Brinell Hardness test and attrition test by varied of composition percentage. There are five kinds of composite material composition had been tested. The result is obtainable of the most precise composition percentage 60% mahogany bark carbon, 15% coconut shell carbon, and 25% resin polyester which has brinell hardness number and attrition massa identically with Standar Nasional Indonesia (SNI).
Keywords: mahogany bark, composite material, disk brake, Brinell hardness test, attrition tes
KARAKTERISASI BATUAN SERPIH PADA LAPANGAN “RK†FORMASI TANJUNG, CEKUNGAN BARITO, KALIMANTAN SELATAN SEBAGAI POTENSI SHALE HYDROCARBON
Get PDFAbstrak
Eksplorasi dan eksploitasi di Indonesia saat ini masih terfokus pada energi konvensional hidrokarbon dibandingkan energi nonkonvensional hidrokarbon seperti gas serpih. Gas serpih adalah salah satu energi nonkonvensional yang kaya material organic dan mencapai kematangan, pada kondisi dan tipe tertentu mampu berfungsi sebagai reservoir minyak dan gas. Formasi Tanjung adalah batuan induk dari Cekungan Barito, terletak diKalimantan Selatan, berpotensi sebagai Shale Hydrocarbon. Pada penelitian ini dilakukan integrasi dari tiga metode diantaranya menggunakan analisis geokimia organik, petrofisika dan interpretasi seismik yang menjadi dasar untuk melihat hubungan kekayaan material organik dan kematangan material organik pada potensi gas serpih di wilayah tersebut. Tahap pertama adalah analisis geokimia organik pada Formasi Tanjung didapat tingkat kekayaan materi organik berkisar 1.26 – 5.98 wt% (Baik - sangat baik), jendela awal kematangan pada kedalaman 2170 m dan kategori tipe kerogen II/III menghasilkan minyak dan gas. Tahap kedua adalah analisis petrofisika yang meliputi perhitungan TOC secara kontinyu, hasil dari analisis petrofisika ini divalidasi dengan nilai analisis laboratorium, didapat nilai regresi 0.923. Tahap selanjutnya adalah melakukan interpretasi seismik dengan metode inversi impedansi akustik untuk melihat persebaran batuan serpih dengan nilai 17718 – 28222 ft/s*g/cc, arah penyebaran batuan serpih sebagai potensi shale hydrocarbon berada di timur dan tenggara daerah penelitian.
Kata-kata kunci: Shale Hydrocarbon, Formasi Tanjung, Material Organik, Petrofisika dan Inversi Impedansi Akustik
Abstract
Exploration and exploitation in Indonesia currently still focused on conventional hydrocarbon energy than the energy of the nonkonvensional hydrocarbons such as shale gas. Shale gas is one of the energyrich organic material nonkonvensional and reach maturity, on the conditions and certain types are capable of functioning as a reservoir of oil and gas. The formation of the Cape is the parent rock of the Barito Basin, located diKalimantan South, potentially as Shale Hydrocarbon. This research was conducted on the integration of the three methods include using organic geochemical analysis, seismic interpretation and petrofisika which became the basis for the wealth of organic material see the relationship and maturity of organic material on the potential of shale gas in the region. The first phase is the analysis of Organic Geochemistry in Formation of Cape obtained the level of wealth of organic matter ranged from 1.26 – 5.98 wt% (Good-excellent), the initial maturity of the window at a depth of 2170 m and category II/III kerogen type produces oil and gas. The second phase is the analysis of petrofisika which include calculation of TOC continuously, the results of the analysis of this petrofisika validated with the value of the laboratory analysis, the regression value obtainable 0923. The next step is doing seismic interpretation with acoustic impedance inversion method to see the spread of the shale rocks with a value of 17718 – 28222 ft/s * g/cc, the direction of spread of shale rocks as shale hydrocarbon potential in the East and Southeast areas of research.
Keywords: Shale Hydrocarbon Formation, Cape, organic Material, Petrofisika and Acoustic Impedance Inversio
