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INDONESIA
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL)
Published by Universitas Negeri Jakarta
ISSN : 23021829     EISSN : 24769398     DOI : https://doi.org/10.21009/03
Core Subject : Science, Education, Engineering,
Electrical & Electronics Engineering Energy Physics Other
Focus and Scope: Physics education Physics Instrumentation and Computation Material Physics Medical Physics and Biophysics Physics of Earth and Space Physics Theory, Particle, and Nuclear Environmental Physics and Renewable Energy
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 25 Documents
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Search results for , issue "Vol 1 (2012): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2012" : 25 Documents clear
INOVASI PEMBELAJARAN FISIKA BERBASIS DIMENSI BELAJAR WAHANA PENGEMBANGAN PEMAHAMAN FISIKA SECARA MENDALAM I Wayan Santyasa
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 1 (2012): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2012
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Belajar fisika merupakan pemaknaan mengenai tiga hal pokok, yaitu (1) hakikat konsepsi, prinsip, hukum, dan teori fisika melalui aktivitas metakognisi, (2) proses-proses ilmiah melalui aktivitas praktik, dan (3) nilai dan/atau sikap ilmiah melalui aktivitas kolaborasi, sosialisasi, dan spiritualisasi. Pemaknaan tersebut merupakan proses yang tidak sekali jadi, tetapi selalu mengalami proses penyempurnaan dan perluasan. Untuk mencapai tujuan tersebut, dimensi belajar menjadi alternatif landasan pembelajaran, yang mencakup: (1) sikap dan persepsi positif terhadap belajar, (2) perolehan dan pengintegrasian pengetahuan baru, (3) perluasan dan penyempurnaan pengetahuan, (4) penggunaan pengetahuan secara bermakna, dan (5) pembiasakan berpikir efektif dan produktif. Lima dimensi belajar tersebut merupakan wahana bagi peserta didik untuk berubah konsepsi secara optimal dalam rangka membangun pemahaman fisika secara mendalam melalui olah pikir, rasa, dan raga dalam belajar fisika yang semuanya bersumber dari dorongan hati yang paling dalam yang akhirnya bermuara pada kerendahan hati. Landasan dimensi belajar tersebut perlu dijadikan pijakan oleh para guru fisika dalam mengembangkan fasilitas belajar yang mampu mengusik hati peserta didik untuk lebih bertanggung jawab terhadap belajarnya. Sikap bertanggung jawab merupakan salah satu kompetensi yang potensial dalam membangun kompetensi-kompetensi berpikir kreatif-produktif, pengambilan keputusan, pemecahan masalah, belajar bagaimana belajar, kolaborasi, pengelolaan dan/atau pengendalian diri. Kompetensi-komepetensi tersebut mutlak diperlukan oleh peserta didik agar mampu menjadi manusia yang adatable, flexible, dan versatil dalam segala aspek kehidupan yang senantiasa berubah. Kata kunci: Inovasi; pembelajaran fisika; metakognisi; dimensi belajar; pemahaman.
STRUCTURAL AND OPTICAL PROPERTIES OF RARE EARTH DOPED PHOSPHATE GLASS CONTAINING NANOPARTICLES M. R. Sahar; E. S. Sazali; Raja J. Amjad
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 1 (2012): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2012
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Transparent rare earth doped phosphate based glasses with and without silver nanoparticles (NPs) are obtained using conventional melt-quenching technique. In the present study, structural properties of glass are investigated by using X-ray Diffraction (XRD) and Transmission Electron Microscopy (TEM). In addition, the optical properties of glass are investigated by means of UV-Vis-NIRand Photoluminescence (PL).The amorphous nature of the glass is confirmed by XRD diffractogram.TEM studies revealed the nano-crystals glass morphology which is associated to the existence of crystallized phase.It is found that the growth of particle size of silver in glass matrix depends mainly on the diffusion coefficient and activation energy of coalescence and more specifically on the heat treatment time and temperature of the matrix. For UV-Vis-NIR studies, the absorption spectra of RE doped phosphate with NPs presents several sharpabsorption bands due to the respective transitions of RE ionswhich has been transit from the ground state tothe excited states. With the addition of NPs, the wavelengthsof the absorption peaks are almost unchanged but the cut-offabsorption bands shift to shorter wavelengths.The emission peaks for the luminescence were found to be located at the wavelength which corresponding to each rare earth. The enhancement of RE luminescence is due to the presence of NPs. The large luminescence enhancement was obtained due to the simultaneous contribution of the REenergy transfer. Our findings may provide some useful information towards the development of functional glasses with controlled optical properties. Keywords: Rare earth (RE), Nanoparticles (NPs).
THE FÖRSTER-TYPE EXCITON QUENCHING MECHANISM AND ITS IMPACT TO THE QUANTUM EFFICIENCY AND EXCITON DIFFUSION IN ORGANIC SEMICONDUCTOR Yoga Divayana
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 1 (2012): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2012
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Organic light-emitting diodes (OLEDs) have emerged as one of the most important generallighting technologies of the future. The current state-of-the-art OLED utilizes various differentlayers which function separately as carriers transport, carriers and excitons blocker, and emittinglayer. The emission layer of the OLED is normally formed by a host-guest system obtained byco-evaporating a small amount of guest molecule in the matrix of host material. It is generallyaccepted that in a host-guest system, concentration quenching is caused by molecules aggregation.As concentration of guest molecule increases, a drop in quantum efficiency is followed by a redshiftin the emission spectrum, characteristics of aggregate state. Here we show that concentrationquenching is also caused by another Förster-type interaction. We investigate this Förster-typeexciton quenching process in various organic molecules and its effect to the exciton diffusion.
TEORI GAUGE DAN GRUP SIMETRI INTERNAL T. B. Prayitno
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 1 (2012): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2012
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Pada makalah ini telah dikaji ulang mengenai konsep dasar transformasi gauge dan kaitannya dengan teori grup. Gagasan mengenai konsep teori gauge yang pertama kali diajukan oleh Hermann Weyl pada tahun 1919 ini mengambil analogi yang sama dengan gagasan yang diajukan oleh Albert Einstein dengan memperkenalkan besaran ‖connection‖ dalam teori relativitas umum. Besaran ini digunakan oleh Einstein untuk mendefinisikan kerangka koordinat lokal dengan menganggap bahwa medan gravitasi bersifat merata/uniform. Selain itu, Gagasan ini pada dasarnya diajukan untuk menyatakan hubungan antara satu pengamat dengan pengamat lainnya dalam meninjau sistem fisika sebagai upaya untuk memperluas ketidak ubahan hukum fisika yang dilihat oleh pengamat mana pun juga. Namun demikian, ‖connection‖ yang pertama kali diajukan oleh Weyl ternyata merupakan simetri dari persamaan Maxwell di dalam teori elektromagnetik mengenai kebebasan memilih potensial skalar dan potensial vektor. Selain itu, Weyl juga menunjukkan bahwa simetri tersebut berkaitan dengan simetri dari suatu grup simetri internal yang tergolong grup Lie, yaitu grup U(1). Keywords: Gauge Invariance, Grup simetri internal.
PENENTUAN KORELASI EMPIRIS LOKAL PERPINDAHAN PANAS PADA BAGIAN SEKTOR ELLIPS MODEL SUNGKUP AP1000 Nanang Triagung Edi Hermawan
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 1 (2012): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2012
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Nuclear reactor technology is one application of the theory of nuclear physics by usingenergy generates from fission reaction in nuclear fuel. AP1000 reactor design applies containment surface cooling by natural air flow. Air flows at inner gap from bottom of concentric cylindrical ellipse sector part to upper of containment surface. Heat transfer characteristic on ellipse sector is very important to be known because in this part heat accumulation from cylindrical heat transfer is happened. Natural convection heat transfer could be represented by empirical correlation equation. Experimental studies have been done on AP1000 containment model proportion 1:40. The result of the experiment indicates that containment surface cooling in accident scenario couldbe happened optimally. Average temperatureof the outer surface of containment is 55.82 0C (well below re-crystallization point for SS-304, which is about 900 0C). The local empirical correlation from this experiment is Nux = 0,577Ra*0,2532, for Rayleigh numbers 7,51 x 105< Ra* < 7,08 x 1010. Keywords: AP1000 reactor, containment cooling, ellipse sector, and empirical correlation.
KARAKTERISASI SENSOR MAGNETIK FLUXGATE KUMPARAN SEKUNDER GANDA MENGGUNAKAN ELEMEN SENSOR MULTICORE Widyaningrum Indrasari; Mitra Djamal; Umiatin Umiatin
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 1 (2012): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2012
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Fluxgate is a magnetic sensor that capable to measure the magnetic field in a very small order. The basic principle of the fluxgate sensor is by comparing the measured magnetic field with the magnetic field reference. In this paper, we describe the characterization of fluxgate magnetic sensor using the double secondary coil design. Configuration of primary coil winding and secondary coil that be used is 4x40 and 2x60. We use vitrovacs 6025Z (1.5 mm width and 0.025 mm thick) as the sensor core. Sensor characterization with varying amounts of the core layer is made to determine the influence of the core layer to the demagnetization factor and the sensor sensitivity. The demagnetization factor is performed by measuring the dimensions of the sensor element and the inductance of the sensor. The inductance of the sensor is measured using a LCR meter GW Instek 829 series at a frequency of 10 kHz. The calculation results show that the increasing amounts of the vitrovac core layer is proportional to the demagnetization factor. To determine the sensor sensitivity, sensor calibration is performed by giving the external field on the calibration coil in a faraday chamber. From the sensor calibration we get the relationship between the external fields with the sensor output voltage. Based on this relationship, we can calculate the sensor sensitivity in working range ± 4 μT. Sensor sensitivity is inversely proportional to the amounts of vitrovac core layer. Sensor with 2 vitrovac core layers has the highest sensitivity (641 mV / μT), and has the smallest absolute error (0.1 at the point of 3.87 μT). Keywords: fluxgate, external field, vitrovac, sensitivity, demagnetization factor, inductance.
EKSTRAKSI MINYAK NABATI DARI SCENEDESMUS SP. MENGGUNAKAN GELOMBANG MIKRO Linda Septiyaningsih; Satwiko Sidopekso; Noor Fachrizal
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 1 (2012): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2012
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Microalgae is one of the raw material for biodiesel. Types of microalgae that used in this research is Scenedessmus Sp. because it has a high content of vegetable oils. Solution of microalgae used do not need to be dried first. It aims to keep the microalgae cells from damage and keeping the lipid content contained in its. Extraction of vegetable oil and microalgae Scenedessmus Sp. used Microwave Assisted Process method. The sample solution Scenedessmus Sp. used 200 mL for the extraction of vegetable oils from microalgae is 380 Watt and the variation time are 2, 3, and 4 minutes. The results showed microalgae cells burst after the extraction so that it can be concluded that the microwaves are used to extract vegetable oil from microalgae. Keywords: minyak nabati, microalgae, Scenedesmus sp., microwave assisted process.
EKSTRAKSI MINYAK NABATI DARI MIKROALGA SCENEDESSMUS SP. MENGGUNAKAN GELOMBANG ULTRASONIK Wulan Ari Kristanti; Satwiko S; Noor Fachrizal
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 1 (2012): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2012
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Microalgae is a fuel substitute for oil, have potential to produce vegetable oil far beyond the content of other commodities. The most effective microalgae is CO2 absorbent, so it can be integrated with a system that emits CO2. Ultrasonic extraction method does not involve chemicals, and is used for the extraction of relevant microalgae. This method can also be integrated with non-traditional breeding system, making it more effective and controllable. Expected results of these activities can be a starting point the development of algae as a substitute for fuel oil and can be used to assist the Government in addressing the problem of energy crisis and fuel needs in Indonesia. Keywords: microalgae, extraction, ultrasonic.
PENGARUH KONSENTRASI LARUTAN EKSTRAK DAUN LIDAH MERTUA TERHADAP ABSORBANSI DAN TRANSMITANSI PADA LAPISAN TIPIS Sunardi Sunardi; Kartika Sari
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 1 (2012): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2012
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

It has done research on the effect of the extract solution concentration in-law tongue (Sansevieriatrifasciata) on the absorbance and transmittance in thin layers. Experimental research is that by extracting the leaves of the tongue-in-law to obtain a dye. Then made a solution with a concentration of 1%, 2%, 3%, 4%, 5%, 6% and7%, and also made merua pure aloe extract solution, a solution of TiO 2, and a mixture of both. Characterization of a solution made with UV-Vis spectrometer 1800 which aims to determine the value of absorbance and transmittance. Spectrometer set at a wavelength of 411nm- 665 nm and an absorbance range 0-3. The results show that there is a relationship between the concentration of the absorbance by the equation A = 22,9c + 0.1946. The greater the concentration used, the greater the smaller the value of absorbance and transmittance values. The maximum absorbance obtained at a wavelength λ = 411 nm and λ = 665 nm while the absorbance value and the maximum trasmitansi respectively 3,58 and 1,433. . Key words:leaf extract in-law tongue (Sansevieriatrifasciata), absorbance, transmittance.
FABRIKASI DAN KARAKTERISASI SIFAT MEKANIK SERAT DAUN LIDAH MERTUA DENGAN MATRIK EPOKSI RESIN SEBAGAI FIBERGLASS Kartika Sari
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 1 (2012): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2012
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

The technology is made from fiberglass for polycarbonate production process has the disadvantage of expensive, environmentally unfriendly and not able to absorb some heat intensity. Though fiberglass materials can now be based on organic materials that are environmentally friendly and easy to obtain. One is the leaf fibers of the tongue-in-law. Fabrication and characterization of the mechanical properties of fiber-matrix leaves the tongue-in-law with an epoxy resin as fiberglass conducted to determine the mechanical properties or mechanical properties (compressive strength, tensile strength and impact) of the resulting composite material. In this paper we will discuss the compressive strength and tensile strength of fiber composite material that leaves the tongue-in-law berfiller. Composite specimens made with the two treatments, namely variations in the composition of leaf fibers and matrix as well as tongue-in-law variation of the thickness of the resulting composite material. Variation of the composition of leaf fibers and the matrix is made tongue-in-law with a ratio of 0%: 100%, 20%: 80%, 35%: 65% and 50%: 50%, while the variation in thickness is 2 mm and 3 mm. The results showed that the addition of leaf fibers of the tongue-in-law and the resulting thickness variations can affect the compressive strength and tensile strength of the composite material. On the compressive strength tests obtained from a thickness of 2 mm is obtained for 128.63 MPa and a thickness of 3 mm at 80 MPa, whereas for the fiberglass on the market obtained compressive strength 36.2 MPa. Compressive strength will be reduced if the thickness of the composite increases and increases with the increasing changes in the ratio between the volume fraction of fibers leaves the tongue-in-law and epoxy resin. For tensile strength test on the composite thickness of 2 mm is obtained for 39.4 MPa and a thickness of 3 mm at 89.6 MPa. The resulting tensile strength increases when the thickness of the composite and the volume fraction ratio increases. This is because the nature of the leaf fibers of the tongue-in-law who has a small and delicate form, so that with increasing fiber volume fraction ratio leaves the tongue-in-law with an epoxy resin can increase the compressive strength and tensile strength composite materials. Based on the analysis of compressive strength and tensile strength can be concluded that the fiber-based composite materials Duan tongue-in-law as a filler and epoxy resin as a matrix that is generated can be used as an alternative to the manufacture of fiberglass because it has a compressive strength and tensile strength greaterthan the thickness of the thinner fiberglass manufacturer. Keywords: composites, leaf tongue-in-law, compressive strength, tensile strength, fiberglass.

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