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All Journal BERKALA FISIKA Media Statistika SAINS DAN MATEMATIKA YOUNGSTER PHYSICS JOURNAL Jurnal Matematika & Sains Jurnal Ilmiah Arena Tekstil Indonesian Journal of Chemistry Journal of Physics and Its Applications Cendekia Journal of Pharmacy Teknomekanik Jurnal Energi Baru dan Terbarukan Journal of Renewable Energy, Electrical, and Computer Engineering

Asep Yoyo Wardaya

Department Of Physics, Faculty Of Science And Mathematics, Diponegoro University, Jl. Prof. Soedharto, SH., Tembalang, Semarang 50275, Indonesia

Author-ID : 412647

Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics

Published : 24 Documents Claim Missing Document

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Identifikasi Kalsium dan Magnesium dalam Obat Menggunakan LIPS (Laser-Induced Plasma Spectroscopy) Heri Sugito; Ali Khumaeni; Wahyu Setia Budi; Asep Yoyo Wardaya
Cendekia Journal of Pharmacy Vol 4, No 1 (2020): Cendekia Journal of Pharmacy
Publisher : STIKES Cendekia Utama Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31596/cjp.v4i1.78

Identifikasi kandungan zat makro pada obat-obatan kimia sangat diperlukan untuk tujuan perlindungan kesehatan masyarakat. Dalam penelitian ini, identifikasi magnesium (Mg) dalam produk farmasi dilakukan menggunakan LIPS (Laser-Induced Plasma Spectroscopy). Laser yang digunakan pada penelitian adalah laser Nd: YAG dan laser CO2. sampel yang digunakan adalah tablet suplemen. Sinar laser diarahkan dan difokuskan oleh lensa cembung pada sampel. Berkas plasma diinduksikan pada permukaan sampel. Spectrum emisi yang tajam dan berintensitas tinggi yang terdeteksi menggunakan laser Nd:YAG menunjukkan adanya kandungan Kalsium (Ca) dan Magnesium (Mg) pada sampel. Hasil yang diperoleh kemudian dibandingan dengan pengujian sampel menggunakan laser CO2. Diperoleh hasil intensitas spectrum Mg jauh lebih tinggi menggunakan laser CO2.

PEMBANGKITAN LUCUTAN PIJAR KORONA NEGATIF PADA KONDISI ATMOSFER DAN PENGARUHNYA TERHADAP RESAPAN AIR PADA KAIN KATUN DAN POLIESTER GREY Zaenul Muhlisin; Dhyan Prastiwi; Herli Darliawati; Achmad Sjaifudin Tayibnapis; Fajar Arianto; Asep Yoyo Wardaya; Sumariyah Sumariyah; Muhammad Nur
Arena Tekstil Vol 32, No 2 (2017)
Publisher : Balai Besar Tekstil

Pada penelitian ini akan diungkapkan tentang lucutan korona negatif pada kondisi atmosfer dan bagaimana pengaruhnya terhadap sifat resapan air di kain poliester grey. Tujuan dari penelitian ini adalah membandingkan pembangkitan lucutan pijar korona negatif dengan dua jenis elektroda yang berbeda geometri dan mengamati sifat serapan air pada kain poliester grey yang telah diiradiasi dengan lucutan ini. Pembangkitan lucutan korona negatif pada kondisi atmosfer ini dilakukan dengan menggunakan dua jenis geometri elektroda, yaitu elektroda titik-bidang dan elektroda garis-bidang. Elektroda titik maupun garis diperlakukan sebagai katoda dan elektroda bidang diperlakukan sebagai elektroda anoda. Pengukuran beda potensial dan arus menggunakan multimeter digital. Iradiasi kain dilakukan dengan menempatkan kain katun maupun poliester pada elektroda bidang. Uji tetes dilakukan untuk mendapatkan karakter serapan air terhadap kain yang telah diiradiasi. Lucutan yang dibangkitkan pada kondisi atmosfer akan meningkat arusnya ketika diberi penambahan tegangan. Karakteristik lucutan saat kain berada anoda sedikit berbeda bila dibandingkan tanpa adanya kain, namun pola lucutan masih relatif sama. Pada uji tetes menunjukkan bahwa lucutan korona negatif pada kain poliester maupun katun berpengaruh pada penurunan waktu serap. Selain itu, durasi iradiasi terhadap kain sangat berpengaruh terhadap penurunan waktu serap air di kain katun maupun poliester. Penurunan mencolok terlihat pada kain poliester grey dimana sebelumnya 16 detik menjadi kurang dari 2 detik.

Analisis hamburan kuantum menggunakan diagram Feynman untuk kasus teori ϕ3 Septian Adhi Nugroho; Asep Yoyo Wardaya; Dwi P. Sasongko
Youngster Physics Journal Vol 6, No 1 (2017): Youngster Physics Journal Januari 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (696.852 KB)

Scattering is the most important key in particle physics. Quantum field theory/ QFT discusses much about scattering of the particles which are reviewed in any dimensions and depend on the lagrangian forms. In this ϕ theory research, lagrangian concept along with the Green function become its based on the calculation of the generating function of Z[J]. The function is a generator when we analyze the forms of Feynman diagram. In the process of the calculation, we will have an infinite series. That function is used to determine the drawing of Feynman diagrams consist of the vertices and propagators. So that the form of diagram may be able to be analyzed. In this research, there will obtain an infinite series which has to be cut to second order for simplicity case. In the first order, we will obtain 2 types of diagram and in the second one we have 8 types of diagram. There are 10 types of the diagram in total which consist of 7 types of connected diagram and 3 types of disconnected diagram.Keywords: scattering, QFT, lagrangian, Green function Feynman diagram, vertice, propagator, infinite series

Perhitungan VEV dari operator Wilson Loop Unknot dari teori Chern-Simons-Witten (CSW) 2+1 dimensi dengan menggunakan teori Braiding dan teori medan kuantum Asep Yoyo Wardaya
Youngster Physics Journal Vol 6, No 2 (2017): Youngster Physics Journal April 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (263.036 KB)

Concepts of Mathematical (Group theory) and Physics (Quantum Field Theory) sciences have a relationship in many Scientific applications. One example of this relationship is topology field theory such as Jones and HOMFLY polinomials in two space and one time dimensions, which have a connection with the concept of the quantum field theory. In this paper, we investigated the value of the invarians polynomial at SO(5) group by using braiding group concept that has exact solution. As comparison, Quantum Field Theory concept will be calculated the Vacuum Expectation Value (VEV) of the Wilson loop unknotted operator in Chern-Simons-Witten theory (CSW) 2+1 dimension at the same group that has a convergent power series solution from order 1 / kn (k is a coupling contant). From comparison calculation of invariant polynomial and VEV of SO(5) group, we have the identical result of them up to 1 / k3 order.Keywords : Invarians Polynomial, CSW, Wilson loop operator, SO(5).

HUBUNGAN ANTARA POLINOMIAL JONES (ASPEK NON-PERTURBATIF) DAN VACUUM EXPECTATION VALUE DARI OPERATOR WILSON LOOP (ASPEK PERTURBATIF) DENGAN MENGGUNAKAN AKSI CHERN SIMONS WITTEN Frangki Leko; Asep Yoyo Wardaya
Youngster Physics Journal Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Perturbatif aspect of Chern Simons Witten theory is viewed as value of Vacuum Expectation Value (VEV) of Wilson loop operator while non-perturbatif aspect of Chern Simons Witten theory is viewed as value of Jones Polynomial. Both aspects will be compared. Calculation of Jones Polynomial is counted by using braiding formula concept which later will be applicated to (SU)2 gauge group. VEV calculation of Wilson loop operator is counted by using Feynman’s diagram and by using vertex and propagator values. Both calculations will be counted to second order of coupling constant. The result of this research indicate that value of pertubatif aspect and non-perturbatif aspect is same although both aspects was counted by two different methods. Keyword : Chern Simons Witten, Vacuum Expectation Value, Wilson loop, Jones Polynomial.

Studi Awal Penerapan Distributed Generation untuk Optimalisasi PLTS Atap On Grid pada Pelanggan PLN Sistem Jawa Bali untuk Memenuhi Target EBT Nasional Jauhar Fahmi; Jaka Windarta; Asep Yoyo Wardaya
Jurnal Energi Baru dan Terbarukan Vol 2, No 1 (2021): Maret 2021
Publisher : Program Studi Magister Energi, Sekolah Pascasarjana, Universitas Diponegoro, Indonesia

Penyediaan energi baru dan terbarukan yang lebih ramah terhadap lingkungan akhir-akhir ini lebih mengemuka tidak hanya karena energi fosil yang semakin menipis tapi sebagai bentuk tanggung jawab terhadap energi berkelanjutan. Namun pada tataran pelaksanaan meski pemerintah melalui KEN dan RUEN telah memberikan pedoman sejauh ini belum berjalan baik. Lebih khusus terhadap pemanfaatan energi surya yang secara ironis yang berpotensi terbesar justru pemanfaatannya paling sedikit. Makalah ini memberikan studi awal pada ide skema pemanfaatan energi surya melalui Photovoltaic (PV) atap yang terkoneksi jaringan on-grid tanpa penyimpanan energi sebagai pembangkitan terdistribusi Distributed Generation dengan memanfaatkan jaringan lisrik yang telah terkoneksi luas. Metode ini memanfaatkan keunggulan jumlah pelanggan yang sangat besar dan dengan memanfaatkan sebarannya yang luas dengan program pembiayaan nasional yang berbeda dengan penggunaan PLTS terpusat berskala besar.

Calculation of Absorption Dose Value using MIRD Method with Cobalt 57 MIBI for Four Body Organs Asep Yoyo Wardaya; Wahyu Setia Budi; Ali Khumaeni; Chorirul Anam; Gani Gunawan
Journal of Physics and Its Applications Vol 2, No 1 (2019): November 2019
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v2i1.6180

MIRD has developed methods, assumptions, models, and mathematical formulae for estimating internal radiation doses from the injected radiopharmaceuticals into the body. This study aims to determine the radiopharmaceutical distribution of Cobalt 57 MIBI in patients identified as having breast cancer by using an oncology examination with MIRD method on 4 patient's organs with some time variations. The four organs of the patient's body are the heart, thyroid, kidney, and liver. The MIRD method developed to calculate the absorption dose of each organ is the product of the cumulative activity and the S factor of each organ studied. The results showed that the highest uptake dose in these patients was in the thyroid and kidney organs, and then followed by the heart and liver. These results indicate that the thyroid and kidney organs are the most vulnerable organs by the method of injecting radiopharmaceutical doses into the body of breast cancer patients.

Comparison of I-V Curves Between the Experiment of Corona Discharge on Gradient Line-To-Plane (GL-P) Configuration and The Mathematical Approach Susilo Hadi; Asep Yoyo Wardaya; Zaenul Muhlisin; Jatmiko Endro Suseno; Pandji Triadyaksa; Ali Khumaeni; Muhammad Nur
Journal of Physics and Its Applications Vol 3, No 2 (2021): May 2021
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v3i2.10491

Research has been conducted on the comparison of the I-V characteristic curve between mathematical study and experiment of the generation of negative DC corona discharge in the Gradient Line-to-Plane (GL-P) electrode configuration. The reason for this research is to calculate the suitability of the corona discharge electrical current between the mathematical and experimental study. The active electrode used has length 2 cm and height 4 cm. This research is conducted with variations in the sharpness angle of the active electrode (θ) 300, 450, and 600 and variations in the distance between the electrodes () 2 cm, 3 cm, and 4 cm. The mathematical formulation of the value of the corona discharge electrical current in the configuration of the GL-P electrode is obtained by using the geometric concept approach, which is the formulation of the capacitance value of the ordinary electrical circuit, with the addition of the multiplication factor value k in the sharp area of the active electrode, because in that area the greatest plasma flow distance is obtained. The value of the multiplication factor is obtained by fitting the curve between mathematical study and experiments. The I-V curve between the mathematical study and the corona discharge generation experiment has a high degree of similarity with the smallest percentage contacting point of 37.50%.The value of the multiplication factor is influenced by the sharpness angle of the active electrode shape and the distance between the electrodes.

Mesh-Assisted Laser-Induced Plasma Spectroscopy Using Pulse Carbon Dioxide Laser for Analysis of Powder Material by Confining the Powder in a Hole and Employing a Condensation Technique Ali Khumaeni; Asep Yoyo Wardaya; Heri Sugito; Nasrullah Idris; Kiichiro Kagawa
Indonesian Journal of Chemistry Vol 19, No 3 (2019)
Publisher : Universitas Gadjah Mada

Analysis of impurity in powder samples has been made by using metal-assisted laser-induced plasma spectroscopy utilizing a pulsed CO2 laser. Various powders including food powder, supplement powder, baby powder, and medicine powder were employed as sample materials. Experimentally, the powder sample was tightly put in a hole made on a metal plate and a metal mesh was placed on the powder surface. A pulse CO2 laser (10.6 μm, 1500 mJ) was irradiated on the powder surface passing through the metal mesh. Luminous plasma was induced by mesh just above the mesh when a part of laser energy attacked the mesh. The other part of laser energy impinged the powders and ablated fine particles of powder to the plasma to be atomized and excited. Identification and analysis of elements in powder were successfully conducted. A linear calibration curve of Cu in baby powder has been demonstrated with an intercept zero, certifying that the present technique was a high possibility to be employed for semi-quantitative analysis of elements in powder material. It was proved that by applying the present technique and employing a condensation technique, the detection sensitivity of Cr impurity in the powder sample increased about twenty times compared to the case without condensation. The limit of detection of Cr in rice powder sample was 25 mg/kg. The proposed method was very convenient for the identification and analysis of elements in the powder sample.

ANALISIS FENOMENA ELEKTROHIDRODINAMIK MENGGUNAKAN PLASMA LUCUTAN KORONA DC POSITIF DENGAN KONFIGURASI ELEKTRODA MATA PAHAT DAN TITIK TENGAH-BIDANG PADA MINYAK KELAPA SAWIT Charis Munajib; Asep Yoyo Wardaya; Zaenul Muhlisin; Isnain Gunadi
BERKALA FISIKA Vol 25, No 4 (2022): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Research has been carried out on the analysis of I-V characteristic curves and electrohydrodynamic phenomena using palm oil with a positive DC corona discharge generator with Chisel Eye and Mid-Field electrode configurations. This study aimed to obtain the effect of several variations used on the characteristic curve and distribution of ion winds on electrohydrodynamic phenomena. This research was conducted with 6 variations of the size of the dimensions of active electrodes and variations in the distance between the electrodes (c) 0.5 cm, 1 cm, 1.5 cm, and 2 cm. In the study of the I-V characteristic curve, the results show that with the increase in the applied voltage, the stronger the current produced will increase. At electrode D and a distance of 0.5 cm, the circuit is given a voltage of 5.32 kV produces a current of 10.5 A, whereas if the circuit is given a voltage of 6.34 kV it produces a current of 27.5 A. In the study of the analysis of electrohydrodynamic phenomena, it was found that if the variation used changed it would affect the diameter of the deformation of the palm oil in the form of a circle. At electrode D, at a distance of 0.5 cm with a voltage of 7.14 kV it produces a circular oil deformation diameter of 2.7 cm, while at a distance of 1 cm with a voltage of 11.23 kV produces a circular oil deformation diameter of 5.5 cm.

Co-Authors Achmad Sjaifudin Tayibnapis Albar, Syarief Ali Khumaeni Betha Noranita Binu Soesanto, Qidir Maulana Bobby Eka Gunara Charis Munajib Chorirul Anam Darliawati, Herli Dhyan Prastiwi Dwi Purwantoro Sasongko Eko Adi Sarwoko Elshaarani, Tarig Evi Setiawati Fajar Arianto Frangki Leko Freddy Permana Zen Gani Gunawan Hadiyanto Hadiyanto Hartuti Purnaweni Heri Sugito Herli Darliawati Irfan Ali, Irfan Isnain Gunadi Jaka Windarta Jatmiko Endro Suseno Jauhar Fahmi Jusak Sali Kosasih Kiichiro Kagawa M.Pd S.T. S.Pd. I Gde Wawan Sudatha . Muhammad Nur Muhammad Nur Muhammad Nur Nasrullah Idris Nur, Muhammad Nuraini, Desy Pandji Triadyaksa Prastiwi, Dhyan Ratna Wulan Sutanti Rita Rahmawati Robertus Heri Sulistyo Utomo Septian Adhi Nugroho Sumariyah Sumariyah Susilo Hadi Susilo Hadi, Susilo Tayibnapis, Achmad Sjaifudin Triyanta Triyanta Wahyu Setia Budi Windarta, Jaka Yusup Hidayat Zaenul Muhlisin

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