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"While the first edition of this textbook was based on a one-year course in computational physics with a rather limited scope, its extent has been increased substantially in the third edition, offering the possibility to select from a broader range of computer experiments and to deepen the understanding of the important numerical methods. The computer experiments have always been a central part of my concepts for this book. Since Java applets, which are very convenient otherwise, have become more or less deprecated and their usage in a browser is no longer recommended for security issues, I decided to use standalone Java programs instead and to rewrite all of the old examples. These can also been edited and compiled with the “netbeans” environment and offer the same possibilities to generate a graphical user interface in short time."

"Fotoproduksi pion-ganda merupakan proses dalam fisika partikel melalui interaksi antara foton dan nukleon yang menghasilkan dua pion. Proses serupa juga terjadi pada fotoproduksi kaon-ganda yang berujung pada pembentukan dua kaon. Dalam konteks ini, amplitudo invarian yang telah didapatkan akan dijadikan dasar analisis komputasi amplitudo invarian kuadrat dalam fenomena fotoproduksi pion-ganda dan kaon-ganda menggunakan FeynCalc, sebuah paket pada perangkat lunak Mathematica yang berbasis pada prinsip-prinsip teori medan kuantum dan diagram Feynman. Perhitungan ini mencakup evaluasi dari kontribusi diagram yang berbeda dan integrasi terhadap ruang fasa yang relevan. Analisis ini berperan penting dalam memperdalam pemahaman terhadap interaksi elektromagnetik dalam fisika partikel, khususnya berkaitan dengan produksi meson pion pada energi yang tinggi.

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Photoproduction of double pion is a process in particle physics, where the interaction between a photon and a nucleon results in the production of two pions. A similar process occurs in photoproduction of double kaon , leading to the formation of two kaons. In this context, the obtained invariant amplitude will form the basis for computational analysis of the squared invariant amplitude in the phenomena of double-pion and double-kaon photoproduction using FeynCalc, a computational package of Mathematica based on the principles of quantum field theory and Feynman diagrams. This calculation includes the evaluation of contributions from different diagrams and integration over the relevant phase space. This analysis plays a crucial role in deepening the understanding of electromagnetic interactions in particle physics, especially in the case of meson production at high energies."

"Strontium Hexaferrite (SrFe₁₂O₁₉) merupakan material magnet permanen yang dikenal karena stabilitas termal dan koersivitasnya yang tinggi. Paper ini membicarakan penerapan model komputasi magnetisasi untuk memperoleh data komputasi loop histeresis magnet permanen SrFe₁₂O₁₉ dan membandingkannya dengan data eksperimen. Pemodelan awal menggunakan Model Stoner-Wohlfarth (S-W) menghasilkan koersivitas sebesar 703,6 kA/m, menyimpang relatif besar yaitu 376,84% dari nilai eksperimen sebesar 147,6 kA/m. Hal ini menyimpukan bahwa model S-W tidak tepat diberlakukan untuk magnet permanen SrFe₁₂O₁₉ . Kemudian diterapkan model Jiles-Atherton (J-A) dengan metode komputasi Runge-Kutta terhadap data eksperimen yang sama. Hasil komputasi nilai magnetisasi magnet permanen SrFe₁₂O₁₉ dan pengukuran menunjukkan terdapat kesesuaian hasil pada magnetisasi jenuh sebesar 0,36 T, namun masih terdapat selisih 5,26% antara nilai koersivitas hasil fitting model Jiles-Atherton (139,9 kA/m) dengan hasil eksperimen (147,6 kA/m). Hasil fitting model Jiles-Atherton memiliki nilai remanensi (Mr) yang hampir identik dengan hasil eksperimen (0,22 T), menunjukkan akurasi tinggi Nilai (BH)max hasil fitting model Jiles-Atherton sebesar 9,8 kJ/m³ menunjukkan kecocokan yang sangat baik dengan nilai eksperimen sebesar 9,6 kJ/m³, dengan selisih relatif hanya sekitar 2,08%. Ini menunjukkan bahwa model mampu merepresentasikan perilaku magnetik material secara cukup akurat, baik dari segi bentuk kurva maupun performa energinya. Penelitian menyimpulkan bahwa model J-A lebih lebih tepat untuk komputasi nilai magnetisasi magnet permanen seperti SrFe₁₂O₁₉.

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Strontium Hexaferrite (SrFe₁₂O₁₉) is a permanent magnetic material known for its high thermal stability and coercivity. This study discusses the implementation of computational magnetization models to simulate the hysteresis loop of SrFe₁₂O₁₉ and compare it with experimental data. The initial simulation using the Stoner-Wohlfarth (SW) model yielded a coercivity of 703,6 kA/m, which deviates significantly by 376,84% from the experimental value of 147,6 kA/m. This result indicates that the S-W model is not suitable for representing the magnetic behavior of SrFe₁₂O₁₉. Consequently, the Jiles- Atherton (J-A) model was applied using a Runge-Kutta numerical method to the same experimental dataset. The computed saturation magnetization value of 0,36 T closely matched the experimental result, with the J-A model predicting a coercivity of 139,9 kA/m only 5,26% lower than the experimental value. The remanence (Mr) from the J-A model fitting was nearly identical to the experimental value at 0,22 T. Moreover, the maximum energy product (BH)max obtained from the J-A model was 9,8 kJ/m³, which closely aligns with the experimental value of 9,6 kJ/m³, with only a 2,08% deviation. These findings demonstrate that the J-A model accurately captures the magnetic behavior and energy performance of the material. The study concludes that the Jiles-Atherton model is more appropriate for simulating the magnetization of permanent magnets such as SrFe₁₂O₁₉."

"Superstring theory is a promising theory which can potentially unify all the forces and the matters in particle physics. A new multi-dimensional object which is called "D-brane" was found. It drastically changed our perspective of a unified world. We may live on membrane-like hypersurfaces in higher dimensions ("braneworld scenario"), or we can create blackholes at particle accelarators, or the dynamics of quarks is shown to be equivalent to the higher dimensional gravity theory. All these scenarios are explained in this book with plain words but with little use of equations and with many figures. The book starts with a summary of long-standing problems in elementary particle physics and explains the D-branes and many applications of them. It ends with future roads for a unified ultimate theory of our world."