Hasil Pencarian  ::  Simpan CSV :: Kembali

"Dynamics of astrophysical systems is often described by plasma physics, yet understanding the nature of plasma turbulence remains as a challenge in physics in both theories and experiments. This book is an up-to-date summary and review of recent results in research on waves and turbulence in near-Earth space plasma turbulence, obtained by Cluster, the multi-spacecraft mission. Spatial and temporal structures of solar wind turbulence as well as its interaction with the bow shock ahead of the earth are presented using cluster data. The book presents (1) historical developments, (2) theoretical background of plasma physics, turbulence theories, and the plasma physical picture of the solar system, (3) analysis methods for multi-spacecraft data, (4) results of cluster data analysis, and (5) impacts on astrophysics and earth sciences."

"This volume summarizes the recent results of the exploration of venus, mars and titan in the field of space plasma physics. These are the only non-magnetic solar system bodies having dense atmospheres. A number of space missions investigated these objects; the past and the current missions are put in context with modern theoretical descriptions. The strength of the book is the comparison of the similarities and differences in the plasma interaction of venus, mars and titan."

"Penelitian ini dilakukan untuk menguji kinerja reaktor plasma non-termal dalam proses gasifikasi sampah padat. Uji kinerja dilakukan dengan dua parameter utama, yaitu kinerja pembentukan gas sintesis dan kebutuhan daya. Proses dilakukan terhadap empat jenis sampah padat, yaitu daun-daunan, serbuk kayu, kertas, dan plastik pada dua kondisi operasi reaktor, yaitu vakum dan diisi gas nitrogen. Penelitian ini memperoleh hasil bahwa kinerja pembentukan gas sintesis adalah rata-rata sebesar 30,67%. Pada kondisi operasi reaktor yang diisi gas nitrogen, kinerja proses lebih baik daripada kondisi operasi reaktor yang vakum. Karena, gas nitrogen merupakan media plasma yang ikut terionisasi sehingga kinerja proses menjadi lebih baik. Sementara, kebutuhan daya hanya sedikit yaitu rata-rata sebesar 47190,6 kWh, yaitu jauh lebih sedikit daripada daya yang dibutuhkan pada plasma termal. Dari hasil uji kinerja dengan dua parameter tersebut, dapat disimpulkan bahwa reaktor plasma non-termal juga dapat digunakan untuk proses gasifikasi sampah padat.

---

This experiment testing non-thermal plasma reactor in solid waste gasification process. The testing does with two main paramater, that are syngas creation and power needed. The process does to four solid waste, that are leaves, saw dust, papers, and plastics, in two reactor operation condition, that are vacuum and nitrogen gas filling. The result of syngas creation is 30,67%. The rector opeation condition with nitrogen gas filling has a better performance than vacuum condition. It is because the nitrogen gas is a plasma medium which get ionitated so the process get better. In otherwise, the average of power needed is 47190,6 kWh, more less than power needed in thermal plasma process. The conclusion is non-thermal plasma can use to solid waste gasification process."

"This volume is devoted to the dynamics and diagnostics of solar magnetic fields and plasmas in the sun’s atmosphere. Five broad areas of current research in solar physics are presented: (1) New techniques for incorporating radiation transfer effects into three-dimensional magnetohydrodynamic models of the solar interior and atmosphere, (2) The connection between observed radiation processes occurring during flares and the underlying flare energy release and transport mechanisms, (3) The global balance of forces and momenta that occur during flares, (4) The data-analysis and theoretical tools needed to understand and assimilate vector magnetogram observations and (5) Connecting flare and CME phenomena to the topological properties of the magnetic field in the solar atmosphere. "

"Siklon burner merupakan alat yang digunakan untuk mengubah bahan bakar padat menjadi gas yang kemudian energinya dimanfaatkan untuk berbagai tujuan, seperti pembangkitan listrik, boiler, dan sebagainya. Sehubungan semua katup siklon burner harus selalu tertutup selama pengujian untuk menjamin kinerja burner yang maksimal, pengamatan fenomena turbulensi dalam ruang bakar tidak dimungkinkan. Oleh karena itu, Computatuonal Fluid Dynamics digunakan untuk menyelesaikan permasalahan tersebut. Hasil simulasi menunjukkan bahwa nilai Energi Kinetik Turbulensi dan Kecepatan secara keseluruhan cenderung mengalami penurunan seiring dengan jarak yang ditempuh setelah memasuki ruang bakar. Hasil Validasi kecepatan pada bagian outlet menunjukkan bahwa kecepatan hasil simulasi dan pengukuran tidak jauh berbeda dan saling berdekatan.

---

Cyclone Burner is a burner used in the purpose of converting solid fuel into gas whose energy is used for various applications such as power generation, boiler, et cetera. Direct observation of turbulence phenomenon is not possible since the combustion chamber must always be closed to ensure possible maximum performance achieved by the burner. Therefore, Computational Fluid Dynamics is used to solve those problems. The simulation results show that both Turbulent Kinetic Energy and Velocity tend to decrease in value by distance travelled by the flow upon entering the combustion chamber. Velocity Validation results show that both velocity curve and velocity point measured during experiment are in good agreement that their marginal results are not greatly different."

"This two-part book is devoted to classic fundamentals and current practices and perspectives of modern plasma astrophysics. This first part uniquely covers all the basic principles and practical tools required for understanding and work in plasma astrophysics. More than 25% of the text is updated from the first edition, including new figures, equations and entire sections on topics such as magnetic reconnection and the Grad-Shafranov equation. "

"This fourth issue on "progress in turbulence" is based on the fourth ITI conference (ITI interdisciplinary turbulence initiative), which took place in Bertinoro, North Italy. Leading researchers from the engineering and physical sciences presented latest results in turbulence research. Basic as well as applied research is driven by the rather notorious difficult and essentially unsolved problem of turbulence. In this collection of contributions clear progress can be seen in different aspects, ranging from new quality of numerical simulations to new concepts of experimental investigations and new theoretical developments. The importance of turbulence is shown for a wide range of applications including: combustion, energy, flow control, urban flows, are few examples found in this volume. A motivation was to bring fundamentals of turbulence in connection with renewable energy. This lead us to add a special topic relevant to the impact of turbulence on the wind energy conversion. The structure of the present book is as such that contributions have been bundled according to covering topics i.e. I Basic Turbulence Aspects, II Particle Laden Flows, III Modeling and Simulations, IV, Experimental Methods, V Special Flows, VI Atmospheric Boundary Layer, VII Boundary Layer, VIII Wind Energy and IX Convection. This book is dedicated to the memory of Prof. Tim Nickels. Shortly after giving an invited lecture at the 4th ITI conference, the turbulence community lost a world-class scientist, a friend and devoted family man."