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Leni Rumiyanti
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Jurnal Teori dan Aplikasi Fisika
Published by Universitas Lampung
ISSN : 2303016X     EISSN : 25491156     DOI : -
Core Subject : Science,
Materials Science & Nanotechnology Physics
Jurnal ini diterbitkan oleh Jurusan Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Lampung sebagai sarana untuk mempublikasikan hasil penelitian, artikel review dari peneliti-peneliti di bidang fisika teori dan aplikasinya. Jurnal ini terbit dua kali setahun (Januari dan Juli).
Arjuna Subject : -
Articles 332 Documents
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Spektrofotometer UV-Vis Untuk Estimasi Ukuran Nanopartikel Perak J Junaidi
Jurnal Teori dan Aplikasi Fisika Vol 5, No 1 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.1366

Abstract

We present a simple technique to estimate the size of silver nanoparticles (AgNPs) based on uv-vis spectra computationally. To have the nanoparticles, the AgNPs colloid was prepared by chemical reduction technique using 40 mM of tri-sodium citrate dihydrate (Na3C6H5O7.2H2O) and silver nitrate (AgNO3) at different concentrations of 2.5 and 5.0 mM. The colloid was then analyzed by using UV-Vis spectrophotometer. For comparison of the size estimation, a small amount of AgNPs was also analyzed using transmission electron microscopy (TEM). By fitting the model and the UV-Vis spectra of these colloids, the set fitting parameters can be obtained including the absorption coefficient, the full width at half maximum (FWHM), the wavelength and absorbance of peaks. It is assumed that the shape of nanoparticle is spherical, so that its diameter can be estimated using the values of scattered absorbance and FWHM. Based on the model it is found that the size of AgNPs are (28 ± 8) nm and (15 ± 7) nm for samples prepared with concentration of 2.5 and 5.0 mM, respectively. On the other hand, from statistically estimation using images from TEM, it is found that the size of AgNPs are (17 ± 4) nm and (8 ± 3) nm for samples prepared with concentration of 2.5 and 5.0 mM, respectively. This discrepancy occurs may be due to non-homogenous of the particles. It indicates, however, this computationally simple method can be used as a first step to estimate size of the AgNPs colloid prior to measurement and calculation using advanced equipments and techniques.
Perbandingan Hasil Uji Fisis Komposit Polimer Berbasis Perlit Dengan Batu Apung Pulung Karo Karo
Jurnal Teori dan Aplikasi Fisika Vol 1, No 2 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v1i2.956

Abstract

Two kinds of polymer composites hava been made from the basic materials: (a) of an epoxy resin with a river sand aggregate which was mixed with a pumice, and (b) of an apoxy resin with a silica sand aggregate which was mixed with perlite. The preparation of samples used the same percentage of weight, and the percentages of epoxy resin with a thinner were varied from 45 gr, 60 gr and 75 gr. Based on the physical comparative test, such as, density, porosity, presure strength, and sound-proof capacity, it is obtained that sample (b) is better than sample (a) if it is used as a construction material. Keywords: pumice, perlite, polymer composites, resin epoxy.
Variasi Doping Pb terhadap Pertumbuhan Fase Bahan Superkonduktor Bi-2212 pada Kadar Ca 1,10 dan Suhu Sintering 830°C suprihatin suprihatin; Riandini Pratiwi; Syafriadi Syafriadi
Jurnal Teori dan Aplikasi Fisika Vol 5, No 2 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i2.1494

Abstract

Abstract. Research on the effect of Pb doping is 0; 0.1; 0.2; 0.3 and 0.4 to the phase growth of the Bi-2212 Ca 1,10 superconducting material was carried out by the solid method at a calcination temperature of 800°C for 10 hours and sintering temperature of 830°C for 20 hours. The effect of Pb doping on the phase growth of superconducting material can be seen by volume fraction, impurity, and degree of orientation. The results showed that samples without doping Pb (Pb 0) had lower volume fraction values than samples with doping Pb (Pb 0.1-0.4). Addition of Pb doping (Pb 0.1-0.4) will increase the volume fraction. The highest volume fraction (Fv) in doping Pb 0.4 was 80.99%, whereas the lowest volume fraction on doping Pb 0.1 was 67.73%. Samples without doping Pb (Pb 0) had a lower orientation grade value than samples with doping Pb (Pb 0.1-0.4). The addition of Pb doping 0.1 and 0.4 has a higher orientation degree compared to Pb doping of 0.2 and 0.3. The sample with doping Pb 0,1 has the highest orientation degree value that is 24,87%. Based on the SEM results all the seals have shown layers arranged in a direction (oriented) with empty space between the slab (void) is relatively small.
Pengaruh Proses Pemanasan Dengan Variasi Media Pendingin Terhadap Nilai Kekerasan Dan Struktur Mikro Pada Baja Karbon Sedang Dina Restia Ningrum; Ediman Ginting Suka; S Suprihatin
Jurnal Teori dan Aplikasi Fisika Vol 2, No 1 (2014): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v2i1.1255

Abstract

Telah dilakukan penelitian dengan variasi media pendingin terhadap nilai kekerasan dan struktur mikro pada baja pegas daun. Baja pegas daun dilakukan proses heat treatment pada temperatur 780oC selama 20 menit. Setelah baja langsung didinginkan secara cepat (quenching)dengan media pendinginan yang berbeda yaitu udara, air, air garam, dan oli. Sampel hasil proses heat treatmentdilakukan uji komposisi kimia, uji kekerasan, dan uji struktur mikro. Hasil penelitian menunjukkan bahwa pengujian komposisi kimia, baja pegas daun termasuk baja karbon sedang (0,57567% C), setelah proses heat treatmenttidak mengalami perubahan komposisi. Ujikekerasan nilai rata-rata tertinggi pada sampel yang menggunakan quenching air garam 61.25 HRC, nilai terendah pada sampel quenching udara 22.94 HRC, untuk quenching air sebesar 59.45 HRC dan untuk quenching oli58.54 HRC. Hasil struktur mikro pada sampel quenching udara menghasilkan butir-butir ferit dan perlit kasar sedangkan pada sampel quenching air, air garam, dan oli menghasilkan butir-butir martensit dan austenite sisa halus.
Investigasi Geologi dan Geolistrik Untuk Menafsirkan Keberadaan Air Tanah Dangkal Di Ambarawa, Lampung Rustadi Rustadi; Gurum Ahmad Pauzi; Opik Taufik
Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i1.1832

Abstract

East  Ambarawa  has  a  large  agricultural  land  prosfek  for  rice  cultivation.  Limitations  of irrigation facilities, caused land fields are only productive in the rainy season. Utilization of ground water to be an alternative to supporting water supply. For this purpose, a geoelectric survey has  been conducted to   map   the   presence   of   shallow   groundwater   in   three lines   with   random  positions  using  Pole-pole configurations.  Through  the  use  of  40  electrodes  with  a  total   length  of  200  m,  geoelectric image  is obtained  to  a  depth  of  70  m.  The  presence  of  ground  water  is interpreted  to  be  in sedimentary layers, at depths  of  12   -  50.  Underlying  sediment  layers  are  composed  of   igneous  rocks  that  correlate with the formed Kerawang hill.
Rancang Bangun Sistem Akuisisi Data Resonansi gelombang Bunyi Menggunakan Transduser Ultrasonik Berbasis Mikrokontroler ATmega8535 N Nurkholis; J Junaidi; Arif Surtono
Jurnal Teori dan Aplikasi Fisika Vol 2, No 2 (2014): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v2i2.1271

Abstract

Telah dilakukan penelitian dengan merancang suatu sistem akuisisi data pada alat ukur resonansi gelombang bunyi melalui komunikasi serial USB dengan menggunakan tranduser PING. Penelitian ini bertujuan untuk menentukan besarnya cepat rambat bunyi di udara. Tranduser ultrasonik PING digunakan untuk mengukur ketinggian air. Tranduser ini memiliki range ketinggian 2 - 500 cm dengan resolusi 0,5 cm. Pendeteksi ketinggian muka air ini menggunakan catu daya sebesar 5 volt. Alat ini akan mengukur ketinggian muka air saat terjadi resonansi dan dideteksi oleh sensor mikrofon yang akan dikirimkan ke mikrokontroler. Penelitian ini menggunakan variasi frekuensi garputala (288, 341, 426 dan 512) Hz untuk menentukan nilai cepat rambat bunyi di udara. Cepat rambat bunyi di udara pada suhu ruangan dengan menggunakan frekuensi 341 Hz adalah 341 ± 0,634 m/s dan memiliki ketelitian tertinggi dengan error 0,2%.
Skrinning Fitokimia Ekstrak Daun Sirsak (Annona muricata) Dan Pengaruhnya Terhadap Laju Korosi Baja Karbon ST 37 Leni Rumiyanti; Amilia Rasitiani; Ediman Giting Suka
Jurnal Teori dan Aplikasi Fisika Vol 7, No 1 (2019): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v7i1.1917

Abstract

Research has been conducted on a phytochemical screening of soursop leaf extract (Annona muricata) and its effect on the corrosion rate of ST 37 carbon steel. Extraction of soursop leaves was carried out by the maceration method, while corrosion rate testing was carried out by weight loss method. ST 37 carbon immersion was carried out for 10 days with 7 variations of concentration, namely 0%, 5%, 10%, 15%, 20%, 25%, 30%, and 35%. The results of phytochemical screening showed that the soursop leaf extract contained saponins, triterpenoids, tannins, alkaloids, and flavonoids. The greatest corrosion rate was obtained at a concentration of 0%, which was 1.3 x 104 mm / y, while the lowest corrosion rate was at a concentration of 30%, which was 0.032 x 104 mm / y. The greatest corrosion inhibition efficiency occurred at a concentration of 35% at 97.53%. Based on the results of the reaserch, it can be concluded that the higher the concentration of soursop leaf extract used, the lower the corrosion rate and the higher the inhibition efficiency of the corrosion
Kunci Pintu Rumah Otomatis Menggunakan Parameter Massa, Tinggi dan Suhu Tubuh Manusia Berbasis Mikrokontroler ATMega32 Ilfa Yuni Arta; W Warsito; Arif Surtono
Jurnal Teori dan Aplikasi Fisika Vol 3, No 1 (2015): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v3i1.1288

Abstract

Telah dirancang alat sistem kontrol kunci pintu rumah otomatis menggunakan prinsip gerbang logika AND. Sistem ini bertujuan merealisasikan kunci pintu rumah menggunakan parameter massa, tinggi dan suhu tubuh manusia serta menguji kinerja dari sensor yang digunakan. Sistem terdiri dari sensor LDR, HC-SR04, LM35DZ, mekanik pintu, catu daya, mikrokontroler ATMega32, rangkaian pengkondisian sinyal dan software bascom AVR. Sistem bekerja dimulai ketika seseorang menginjak timbangan, jika massa orang tersebut sesuai dengan range maka, dilanjutkan membaca tinggi, saat tinggi sesuai dilanjutkan mendeteksi suhu jika suhu sesuai mikrokontroler yang diberi tegangan 12 V dari catu daya akan menggerakan motor DC untuk membuka pintu. Hasil penelitian uji sensor menunjukkan bahwa resolusi sensor massa 0,5 kg dan menghasilkan nilai offset keluaran sebesar 4.624 V yang merupakan keluaran untuk massa sebesar 0 kg. HC-SR04 memiliki resolusi kemiringan sudut 130 dan jarak 2 – 20 cm HC-SR04 memiliki tanggapan yang linier dan sensitif dengan fungsi alih y = 0.9789x - 0.3474 dan nilai R2 = 0,992. Sensor LM35DZ menunjukkan resolusi 10 mV/0C. Pengujian sistem dilakukan oleh 8 orang mahasiswa fisika menghasilkan 4 orang masuk untuk semua range sehingga pintu membuka, 1 orang tidak masuk pada range tinggi dan 3 orang tidak masuk pada range massa sehingga sistem pintu tidak membuka.
Pembuatan dan Karakterisasi Sensor Amonia Berbasis Bending Fiber Optic chandra pratiwi; Gandi Sugandi; Junaidi Junaidi
Jurnal Teori dan Aplikasi Fisika Vol 6, No 2 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i2.2137

Abstract

This research was approved optical fiber bending sensors with good characterization and variations in the concentration of ammonia solution. This research uses experimental methods in the laboratory. The technique was done by stripping multimode optical fibers (cladding measuring 125 μm and core 62 μm) which is exfoliated cladding then replaced by polydimethylsiloxane (PDMS) and bending with the combustion process. The concentration of ammonia solution used in this research varies from 1-10%. Measurement of fiber optic sensors using optical power meter (OPM) with a wavelength of 1310 nm and 1550 nm, and light source (LS) at a frequency of 0 Hz, 270 Hz, 1000 Hz, and 2000 Hz. The result showed that ammonia solution caused instability in light intensity. However, the higher the frequency of light. The lower of the intensity with the difference in intensity produced is very small.Keywords: ammonia, bending, cladding, optical fiber, polydimethylsiloxane (PDMS).
Pengaruh Aditif Ferro Boron (FeB) terhadap Karakteristik Serbuk Hematit (α-Fe2O3) Suci Pangestuti; Pulung Karo Karo; Parmadean Subayang; Candra Kurniawan
Jurnal Teori dan Aplikasi Fisika Vol 5, No 2 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i2.1810

Abstract

The study about effect of ferro boron (FeB) additive towards characteristic of hematite (α-Fe2O3) powder has been done. The powders of FeB andα-Fe2O3 was milled with dry milling method using  Planetary Ball Mill (PBM) for 12 hours. Variation of FeB compositions are 4 and 8 wt.%. The milled powder was calcinedat temperatures of  900, 1000 and 1100oC. The characterization of the powders was performed by Particle Size Analyzer (PSA), true density, X-Ray Diffraction (XRD) and Vibrating Sample Magnetometer (VSM). The results effect of additives FeB showed an increasing of  particle size which related to decrease of true density of  sample  8 wt.% composition with a value 2.80 μm and 2.47 g / cm3. Respectively the  XRD characterization of sample with 8 wt.%composition with the calcination temperature of 1000 and 1100 °C showed that  iron boride (Fe2B)phase was formed. Maghemite (γ-Fe2O3) and magnetite (Fe3O4) was formed during calcination for non-additive sample. The VSM characterization showing the effect of the calcination temperatureare increasing the magnetic properties  and the addition of FeB tends to lower the magnetic properties within  samples before and aftercalcined.

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