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Usman Malik
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kfi@ejournal.unri.ac.id
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Jurusan FMIPA Universitas Riau Kampus Bina Widya Km 12,5 Simpang Baru Pekanbaru
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INDONESIA
Komunikasi Fisika Indonesia
Published by Universitas Riau
ISSN : 14122960     EISSN : 2579521X     DOI : 10.31258/jkfi
Core Subject : Science, Engineering,
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
KFI mempublikasikan artikel hasil penelitian dan review pada bidang fisika, namun tidak terbatas, yang meliputi fisika murni, geofisika, plasma, optik dan fotonik, instrumentasi, dan elektronika, dan fisika terapan (aplikasi fisika).
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 390 Documents
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MULTI-PHOTONS TRAPPING STABILITY WITHIN A FIBER BRAGG GRATING FOR QUANTUM SENSOR USE ', Saktioto
Komunikasi Fisika Indonesia Vol 11, No 8 (2014)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.11.8.1-7

Abstract

We propose an interesting result of the trapped multi photons distribution within a fiber Bragg grating. Thetrapped photons are confined by the potential well, which introduce the motion of photons in a fiber Bragg gratingaffected by multi perturbations. The external perturbations are defined as series of nonlinear parametric in terms ofpotential energy. This investigation is developed by using the nonlinear couple mode equations and under Braggresonance condition where the initial frequency of the light, ? 0 is the same value as the Bragg frequency, ? B . Theresults show that the higher perturbation series represents the potential well is much indifferent of equilibrium. Inapplications, the perturbation can cause the trapped photons instability which introduces the escape photons from thepotential well. The applications such as entangled photon source and quantum sensors can be performed.
KARAKTERISASI MATERIAL FEROELEKTROK Ba(1-x)Sr(x)TiO3 (BST) UNTUK KOMPOSISI x=0,1; 0,2 dan 0,3 Rahmi Dewi; Krisman '; Zuhdi '
Komunikasi Fisika Indonesia Vol 11, No 9 (2014)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (239.231 KB) | DOI: 10.31258/jkfi.11.9.577-581

Abstract

Barium Strontium Titanate, Ba0.9Sr0.1TiO3, Ba0.8Sr0.2TiO3 and Ba0.7Sr0.3TiO3 (BST) samples were prepared usingsolid state chemical reaction. The microstructure of these samples were characteritation using the X-ray Diffractiontechnique (XRD) and Scanning Electron Microscopy (SEM). Then the samples were composition variationdifferent annealed at 700oC a for 60 minutes in air. The XRD characterization showed that the crystallizationimproved as the barium increased. The microstructure showed that the samples were homogeny with the grainsize were uniform. The grain size samples increases with the strontium increased.
MODEL OF TERAHERTZ PULSE-BLOOD FLOW INTERACTION FOR OVERCOMING CHOLESTEROL PLAQUE VENTURI EFFECT IN ARTERY Usman Malik; Muhamad Hamdi
Komunikasi Fisika Indonesia Vol 11, No 9 (2014)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (310.285 KB) | DOI: 10.31258/jkfi.11.9.582-590

Abstract

This model attempts to analyze involvement using THz radiation interaction with cholesterol depositsform plaque on the inner walls of an artery. It interacts with blood fluid by principle of THz radiation heattransfer mechanism for overcoming cholesterol plaque venture effect in artery. Athermanous plaque, abuildup of white blood cell wherein is sometimes termed fatty, despite absence of adiposities depositswithin the wall of an artery. When cholesterol deposits form plaque on the inner walls of an artery, thevelocity of blood flow increases when t increases and generates higher pressure according to the ventureeffect. Consequences of this effect can lead to collapse the artery, causing a myocardial infarction in acoronary artery. Analysis on the cholesterol plaque effect in blood flow through the forced convection ofterahertz pulse heat release in artery causes the blood flow change after interacting with terahertz pulse.The results indicate that blood velocity and diffusivity for axial positions to higher with change oftemperature rises along radial position caused by heat release of the absorbed terahertz pulse power inblood flow. Transient behavior of a 10 THz pulse-blood flow interaction in artery wherein the resultchosen varies the blood kinematics viscosity to see how fast this final blood velocity profile is attained.Indeed, for very small blood kinematics viscosities, the response is slower. This result is to be expectedsince the blood kinematics viscosity unit is cm2/s just like the diffusion coefficient and the thermaldiffusivity.
PERHITUNGAN PARAMETER KISI KRISTAL BERSTRUKTUR HEXAGONAL BERDASARKAN POLA DIFRAKSI ELEKTRON DENGAN DENGAN BANTUAN KOMPUTER Erwin '; Salomo '; Defrianto '; Mbantun Ginting; M. Rasyid Ridho
Komunikasi Fisika Indonesia Vol 11, No 9 (2014)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (395.346 KB) | DOI: 10.31258/jkfi.11.9.591-600

Abstract

Pola difraksi electron yang diperoleh melalui mikroskop electron untuk kristal berstruktur hexagonal seperti lapisan tipis cobalt sulit untuk dilakukan secara manual. Oleh karena itu, perlu dilakukan perhitungan terhadap parameter kisi cobalt dengan menggunakan komputer. Dalam penelitian ini, telah dibuat dua buah program komputer yang ditulis dengan menggunakan Matrix Laboratory (Matlab) versi R2008b. Program pertama disebut program menu yang digunakan untuk menulis data yang diperlukan dalam perhitungan. Program kedua disebut program utama yang dibuat untuk melakukan perhitungan terhadap parameter kisi a dan c dengan memanfaatkan data pada program menu. Data yang digunakan dalam penelitian ini adalah pola difraksi elektron cobalt dalam bentuk lapisan tipis dari transmission electron microscope (TEM). Jari–jari dari masing masing cincin pola difraksi cobalt diukur dengan menggunakan jangka sorong. Nilai ini diinputkan kedalam program menu. Program utama akan menghitung nilai dari jarak antar bidang ሺ ????????ℎ???????????????? ) dlam kristal. Langkah berikutnya, program utama akan melakukan perhitungan terhadap nilai-nilai parameter kisi untuk semua kemungkinan bidang dari sistem kristal heksagonal dengan memanfaatkan subroutine bisection. Pada langkah akhir, program utama akan memilih untuk semua kemungkinan bidang bidang kristal dari sistem kristal heksagonal untuk mana nilai parameter kisi a dan c yang hampir sama. Hasil penelitian menunjukkan bahwa perhitungan parameter kisi a dan c untuk h k l berbeda adalah a=2.4998 Å dan c=4.0545 Å.
MENENTUKAN LAPISAN AKUIFER DAS (DAERAH ALIRAN SUNGAI) SIAK DENGAN MEMBANDINGKAN HASIL UKUR METODE GEOLISTRIK RESISTIVITAS KONFIGURASI WENNER DAN KONFIGURASI SCHLUMBERGER Riad Syech; Juandi '; M .Edizar '
Komunikasi Fisika Indonesia Vol 11, No 9 (2014)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (287.58 KB) | DOI: 10.31258/jkfi.11.9.601-611

Abstract

Telah dilakukan penelitian untuk menentukan akuifer dan lapisan litologi bawah permukaan diJembatan Siak 1, 2, dan 3 Pekanbaru dengan menggunakan metode geolistrik dalam konfigurasielektroda Wenner dan konfigurasi Schlumberger. Data tersebut diproses menggunakan exceluntuk memperoleh resistivitas semu. Pengolahan data menggunakan perangkat lunak Res2Dinv3.56 dan VES, hasil pengolahan data diperoleh nilai resistivitas batuan dan litologi lapisanbatuan bawah permukaan tanah. Interpretasi dari software Res2Dinv 3.56 dan VES menunjukkanbahwa di Jembatan Siak 1, Jembatan Siak 2, dan Jembatan Siak 3 Pekanbaru litologinya berupapasir berlempung, pasir, pasir kerikil, dan batuan keras seperti granit, gamping. Akuifer tertekanteridenfikasi di Jembatan Siak 1 dan 3 Pekanbaru dan Jembatan Siak 2 Pekanbaru diidentifikasimerupakan lapisan akuifer bebas. Kedalaman akuifer yang di peroleh dengan menggunakanperangkat lunak VES dan Res2Dinv memiliki perbedaan kedalaman hanya berkisar 4 m.
MODEL HEAD HYDROLIC AKUIFER BEBAS KONDISI UNSTEADY STATE Juandi. M. '
Komunikasi Fisika Indonesia Vol 11, No 9 (2014)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (419.298 KB) | DOI: 10.31258/jkfi.11.9.612-627

Abstract

Telah dilakukan penelitian model head hydrolic akuifer bebas kondisi unsteady state. Hasil penelitianmenunjukkan bahwa dengan head rata – rata kondisi alamiah dengan rata-rata 7,26 m makavalidasi hasil simulasi pada tahap kalibrasi ini penyimpangan hasil head hydrolik simulasisebesar -2,63 %.Model head hydrolic akuifer bebas kondisi unsteady state tahun 2014 telahmenunjukkan zonasi aman akuifer bebas Kota Pekanbaru. Bahwa kondisi akuifer bebas headhydrolik kondisi unsteady state tahun 2014 dalam kondisi aman (baik) dengan persentasepenyimpangan 11,02 %.Dengan memperhatikan model head hydrolic unsteady state yang ada,maka dapat diberikan usulan kebijakan berdasarkan model akuifer bebas unsteady state di KotaPekanbaru, yaitu pemerintah dapat mengeluarkan izin pengambilan air akuifer bebas baik olehpenduduk dan industry dengan tetap memperhatikan konservasi berupa imbuhan air bawahtanah.
ANALISA PENGARUH PANJANG GELOMBANG SUMBER CAHAYA PENGINDUKSI FLUORESENSI TERHADAP FLUORESENSI KLOROFIL PADA DAUN BAYAM YANG DIPENGARUHI VARIASI SINAR MATAHARI Fitria Asriani; Minarni '
Komunikasi Fisika Indonesia Vol 12, No 10 (2015)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (357.688 KB) | DOI: 10.31258/jkfi.12.10.629-636

Abstract

Chlorophyll fluorescence imaging and spectroscopy can be used to detect early abnormalities on plants, which are caused by plant diseases, harsh environments, and intentional treatments. Development in chlorophyll imaging and spectroscopy which is economical, low cost, and portable are needed in attempts to explore fluorescence spectrum as markers for diseases and environmental stresses on plants. In this research, a fluorescence imaging system was built using LEDs with three variations in wavelengths i.e. 450 nm; 525 nm; and 680 nm, and a 3 Mega Pixel CMOS camera. The LED light was used as an excitation beam to induce chlorophyll fluorescence of spinach leaves. Relation between the LED wavelengths and the fluorescence intensities of the spinach leaves were investigated. The samples were Spinach leaves from Amaranthus tricolor Spinach plants grown under two variations of sunlight intensities. Two variations of the intensities were about 90% using plastic as the cover and 40% using plastic plus paranet. Relation between the sunlight intensity and fluorescence intensity was also investigated. The fluorescence intensity of the leaves were measured from RGB plot using Image-J software. The research results show that fluorescence intensity of the samples without paranet were higher than those using paranet. This is possibly caused by chlorophyll contents which is higher on plants without paranet. The excitation wavelength that showed the highest different fluorescence intensity was 680 nm, which showed 6,3% the difference in fluorescence intensity using and without paranet while for other excitation wavelength were 0,4% and 1,7% for 450 nm and 525 nm respectively.
ANALISA PENGARUH INTENSITAS SUMBER CAHAYA PENGINDUKSI FLUORESENSI TERHADAP INTENSITAS FLUORESENSI KLOROFIL PADA DAUN BAYAM MENGGUNAKAN METODE FLUORESCENCE IMAGING Minarni '; Iswanti Sihaloho
Komunikasi Fisika Indonesia Vol 12, No 10 (2015)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (365.987 KB) | DOI: 10.31258/jkfi.12.10.637-643

Abstract

Chlorophyll fluorescnce imaging and spectroscopy has been developed intensively during last decade to detect early symptoms of plant diseases and effects of environtmental stresses on plants. An economical, portable, and remote sensing system is needed for those purposes. In this research, a fluorescence imaging system was built using a LED with 465 nm wavelength, some neutral density filters and a 3 Mega Pixel CMOS camera. The intensities of LED light were varied using 5 different optical densities of the neutral density filters which were represented by their optical power after filtered 5,0 mW; 3,3 mW; 2,0 mW; 1,5 mW; and 0,7 mW respectively. This system was used to investigate the relation between the intensity of LEDs as a fluorescence inducer and the fluorescence intensity of spinach leaves grown under two variations of sunlight intensity. The variations were about 90% using plastic cover and 40% using plastic plus paranet cover. The spinach plant was Amaranthus tricolar varitas. The differences between chlorophyll fluorescence intensity of the spinach leaves for both treatment were also investigated. The fluorescence intensities were found from RGB plot using ImageJ software. The reseach results showed that intensity of LED light influenced the fluorescence intensity resulted on the spinach leaves. The higher the intensity of LED, the higher the fluorescence intensity. The spinach leaves grown without paranet provided higher fluorescence intensity however, the difference between both treatments was seen higher when LED intensity was the lowest which was about 41,6% difference.
PEMANFAATAN LIMBAH TEMPURUNG KELAPA SEBAGAI ENERGI BIOMASSA UNTUK PENGERINGAN HASIL PERTANIAN Juandi M. '; Eka Afriyani; Salomo '
Komunikasi Fisika Indonesia Vol 12, No 10 (2015)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (446.275 KB) | DOI: 10.31258/jkfi.12.10.644-650

Abstract

Telah dilakukan penelitian tentang pemanfaatan limbah tempurung kelapa sebagai energy biomassa untuk pengeringan hasil pertanian. Ruang pengering yang dibuat adalah berupa kolektor berbentuk persegi panjang dengan ukuran 130 cm x 97 cm x 120 cm yang dilengkapi dengan cerobong berbentuk selinder berdiameter 30 cm, tingginya 30 cm dan tebalnya 0,7 mm. Sampel yang digunakan adalah kerupuk singkong yang diproduksi di kelurahan Rejosari Kecamatan Tenayan Raya Kota Pekanbaru. Pengukuran suhu menggunakan thermometer diperoleh suhu maksimum di rak ke 2 sebesar ????????????????????????C, dan suhu maksimum di rak 1 sebesar ????????????????????????C, hal ini disebabkan karena jarak rak 2 lebih dekat terhadap sumber energy biomassa. Kadar air rata-rata yang didapat adalah sebesar 20,5 %, 13,5 %, 10,8 %, 9,6 %, 6,1 %, 3,7 %, 2,3 %, dan 1,3 %. Efesiensi waktu pengeringan dengan menggunakan energi biomasssa pada hari cerah dan hujan adalah sebesar 60 % dan 93. 94 %.
PENYEDIAAN AIR TAWAR DARI PENYULINGAN ENERGI SURYA MENGGUNAKAN TEKNIK REFLEKTOR CERMIN CEKUNG Muhammad Edisar; Usman Malik
Komunikasi Fisika Indonesia Vol 12, No 10 (2015)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (411.479 KB) | DOI: 10.31258/jkfi.12.10.651-657

Abstract

Telah dilakukan penelitian untuk menghasilkan air bersih dengan menggunakan energi matahari memakai teknik pengumpul panas reflektor cermin cekung. Pada penelitian ini reflektor dibuat berukuran diameter 2,2 meter, tinggi 0,3 meter dan titik fokus 1 meter. Reflektor diletakkan dapat disinari matahari secara langsung sepanjang hari. Medium berisi sampel yang akan di suling diletakkan diatas reflektor tepat pada posisi titik fokusnya. Sepanjang hari proses penyulingan suhu diukur setiap satu jam dengan waktu pengamatan mulai pukul 08.00 sampai 16.00 WIB. Lama pengamatan selama tujuh hari jika hari cerah. Penelitian menghasilkan suhu terukur maksimum sampel air yang akan di suling menggunakan reflektor sebesar 100˚C dan pada titik fokusnya 140˚C. Hasil pengamatan untuk penyulingan tanpa reflektor diperoleh suhu maksimal pada sampel air yang di akan disuling sebesar 64˚C. Volume air hasil penyulingan cukup baik dan hasil pengujian laboratorium terhadap sampel air sebelum dan sesudah di suling menunjukkan peningkatan mutu kualitas yang sangat signifikan.

Page 4 of 39 | Total Record : 390

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