Hasil Pencarian  ::  Simpan CSV :: Kembali

"Zeolit alam adalah mineral yang memiliki sifat khas dan struktur rongga yang teratur dalam ukuran tertentu, sehingga berpotensi sebagai adsorben limbah amonia. Kapasitas adsorpsi dan selektivitgasnya dapat ditingkatkan degnan modifikasi zeolit alam melalui proses pertukaran ion menjadi H-Zeolit yang memiliki inti aktif H.Penelitian ini menggunakan zeolit alam yang berada dari Lampung yang mengandung klinoptilolit sekitar 75%. kapasitas adsi=orpsi Zeolit alam Lampung (ZAL) diperbandingkan dengan tiga jenis H-Zeolit yang dihasilkan dari proses pertukaran ion antara ZAL dengan NH4NO3 dan (NH4) SO4 dan kemudian dikalsinasi pada suhu 550 C. Adsorpsi dilakukan secara batch pada suhu dan tekanan kamar dengan variasi waktu dan konsentrasi awal amonia. Dilakukan pula percobaan regenarasi terhadap zeolit yang telah jenuh dengan NH3, dengan jalan pemanasan pada suhu 550 C selama 1 jam dan selamanya digunakan kembali untuk adsorpsi. Sebagai tahap awal adsorpsi regenerasi dilakukan sebanyak dua setengah siklus.Hasil penelitian ini menunjukkan bahwa dari segi kapasistas adsorpsi dalam pemakaian siklus adsorpsi regenerasi, H-zeolit lebih baik dari pada zeolit alam setelah regeneraasai zeolit alam mengamalami penurunan kapasista adsorps yang cukup besar. Secara umum H Zeolit yang diperoleh dari aktivasi dengan amonium nitrat merupakan zeolit yang paling baik jika digunakan sebagai adsorben amonia. Perlu dilakukan percobaan lebih lanjut menggunakan air limbah atau limbah tiruan untuk mengetahui kapasitas adsorpsi maupun selektivitasnya dengan siklus adsorpsi yang lebih panjang."

"This versatile book teaches control system design using H∞infty techniques that are simple and compatible with classical control, yet powerful enough to quickly allow the solution of physically meaningful problems. The authors begin by teaching how to formulate control system design problems as mathematical optimization problems and then discuss the theory and numerics for these optimization problems. Their approach is simple and direct, and since the book is modular, the parts on theory can be read independently of the design parts and vice versa, allowing readers to enjoy the book on many levels.The development of H∞infty engineering was one of the main accomplishments of control in the 1980s. However, until now, there has not been a publication suitable for teaching the topic at the undergraduate level. This book fills that gap by teaching control system design using H∞infty techniques at a level within reach of the typical engineering and mathematics student. It also contains a readable account of recent developments and mathematical connections.The authors treat control design problems in a physically correct way. They present a small set of specific rules that the reader can apply to convert a particular design problem to the fundamental optimization problem of H∞infty control. This precisely formulated mathematics problem can then be solved on a computer. The book introduces the control software package OPTDesign, which allows the reader to easily reproduce the calculations done in the solved examples and even try variations on them. The description of how to convert an engineering problem to a form suitable for CAD is simpler than in other books."

"One of the main accomplishments of control in the 1980s was the development of H∞ techniques. This book teaches control system design using H∞ methods. Students will find this book easy to use because it is conceptually simple. They will find it useful because of the widespread appeal of classical frequency domain methods.Classical control has always been presented as trial and error applied to specific cases; Helton and Merino provide a much more precise approach. This has the tremendous advantage of converting an engineering problem to one that can be put directly into a mathematical optimization package.After completing this course, students will be familiar with how engineering specs are coded as precise mathematical constraints."

"This monograph presents a unified mathematical framework for a wide range of problems in estimation and control. The authors discuss the two most commonly used methodologies: the stochastic H2 approach and the deterministic (worst-case) H� approach. Despite the fundamental differences in the philosophies of these two approaches, the authors have discovered that, if indefinite metric spaces are considered, they can be treated in the same way and are essentially the same."

"Background: The prevalence of Helicobacter pylori (H. pylori) infection in the world is quite high, especially in developing countries. Usually the patient shows no specific symptoms and chronic gastritis therefore becomes chronically infected The complication of the injéction is the development of peptic ulcer; which is a predisposing factor for gastric carcinoma. Early diagnosis is an important step to avoid these complications by providing immediate accurate therapy. Methods: In this study the CLO, MIU (Motility Indole Urease) tests and culture were conducted on 131 biopsy samples of the stomach antrum mucous tissue taken from chronic dyspepsia patients from several hospitals in Jakarta. In the CLO test, biopsy tissue was put in a small well agar to be incubated at room temperature. In the MIU test the biopsy tissue sample was submerged in the small MlU tube agar with a depth of approximately 2/3 rds from the surface, and then incubated at room temperature. Another piece of biopsy tissue was cultured micro-aerophylicalty The CLO and MlU tests are considered positive if the color changes from yellow to red and are considered negative if there is no color change within 24 hours. Results: Compared to culture, the CLO test demonstrated 38% sensitivity; 96% specificity, 94% positive predictive value and 52% negative predictive value, whereas the results of the MIU test against culture method showed 76% sensitivity 89% specificity 88% positive predictive value, and 78% negative predictive value. Conclusion: The MIU test that showed high sensitivity and specyficity and thus could be further developed as an alternative diagnostic method for H. pylori infection."

"ABSTRAKQuadcopters adalah UAV, yang merupakan Kendaraan Udara Tak Berawak, yang diangkat dan didorong oleh empat baling-baling. Ini menyimpulkan bahwa quadcopter dikendalikan dari jarak jauh oleh pengguna atau pilot. Quadcopter bukan pesawat bersayap tetap, yang digolongkan sebagai rotorcrafts, karena diangkat dan didorong oleh empat bilah rotor yang memutar tiang. Menurut Divya Joshi (2017), memperluas efektivitas dan efisiensi kerja, mengurangi beban kerja dan biaya pembuatan, meningkatkan akurasi, memperbaiki administrasi dan hubungan klien, dan memperbaiki masalah keamanan dalam skala besar adalah beberapa penggunaan terbaik yang ditawarkan bisnis quadcopters secara global.Menggunakan teknologi miring-rotor pada quadcopter dianggap sebagai desain baru untuk meningkatkan kapasitas yang tak ternilai untuk mempertahankan pusat tubuhquadcopter dalam posisi yang rata, bebas dari pergerakan dan kecepatan kapal udara, seperti penyempurnaan yang dihasilkan dari tambahan dari memiringkan pengembangan dalam dua baling-baling yang berlawanan dalam dua cara, selain rotasi baling-baling (Fernandes, 2011). Quadcopters miring-rotor memiliki beberapa bentuk dan bahan yang dapat digunakan pada proyek ini. Bentuk paling umum di quadcopters adalah X-shaped. Namun, itu juga dapat dibuat dalam model berbentuk H dan Plus.

---

ABSTRACT

Quadcopters are UAV, which is Unmanned Aerial Vehicle, that is lifted and impelled by four propellers. This means that the quadcopter is controlled remotely by a user or a pilot.

Quadcopter is not a fixed-wing aircraft, which is classified as rotorcrafts, because it is lifted and propelled by the four rotor blades turning around a mast. According to Divya Joshi (2017), expanding work effectiveness and efficiency, diminishing workload and

creation costs, enhancing accuracy, refining administration and client relations, and fixing

security issues on an immense scale are a few of the best uses quadcopters offer businesses globally. Using tilting-rotor technology on a quadcopter is considered as a new design to improve the invaluable capacity to maintain the centre of the quadcopters body in a levelled

position, free from the air ships movement and speed, such as refinement resulting from the adjunct of a tilting development in two opposed propellers in two ways, other than the propellers rotation (Fernandes, 2011). Tilting-rotor quadcopters have several shapes and materials that could be used on this project. The most common shape in quadcopters is the X-shaped. However, it can also be created in the H-shaped and the Plus-shaped

models."