Hasil Pencarian  ::  Simpan CSV :: Kembali

"Fungsi dari batang kendali pada reaktor nuklir riset multiguna adalah membuat stabilisasi dan merupakan alat pengendali dari reaksi-reaksi berantai nuklir, dengan adanya dampak dari radiasi Cerenkov dan fluks neutron termal dalam ruang reaktor. Menggunakan Model Ising dengan pendekatan kondisi-kondisi kuantum dan percobaan melaluiperalatan Magnetic Stirrer ditentukan turunan material-material dari Sr^A^O^. Salah satu dari tiga tipe material itu adalah Sr2Al2O^8. Material ini menunjukkan kekuatan pada absorbsi fluks neutron termal sebesar 2,1 x 10s - 1,8 x 106 currie/mm, nilai Konduktivitas Elektriknya adalah 26,62 - 29,98 pada temperatur 800° - 890° C, sedangkan pada kondisi fluks neutron termal sebesar 2,1 x 105 currie/mm nilai Konduktivitas Elektriknya adalah 29,44 -37,88 pada standar IAEA. Pada nilai medan magnetik sebesar 459 tesla dan absorbsiyang dilakukan terhadap 2,1 x 105 currie/mm neutron termal, reduksi struktur kristalnya mencapai 6,88% sampai 10,95% untuk jangka waktu 25 tahun pada daya 45,7 megawatt dengan matriks elemen bahan bakar nuklir adalah UO2 yang makin diperkaya dan Pu2O serta Th2Oy.

---

The functional of a multi purpose research nuclear reactor control rod blade nuclear reactor is stabilized and controlling devices for nuclear chain reactions, the existing of Cerenkov's radiation impact and thermal neutron flux in reactor chamber. Using Ising Model with quantum states approaching and testing by Magnetic Stirrer equipment had determined the Sr2 A12O2-X derivatives materials. One of three types is Sr2 A12O1.8. This material shown the strength of thermal neutron flux absorbed about 2.1 x 105 ~ 1.8 x 106 currie/mm, the value of Electrical Conductivity is 26.62 - 29.98 at 800 - 890° C temperature, however at 2.1 x l(r currie/mm thermal neutron flux condition is 29.44 - 37.88 in IAEA standard At 450 tesla magnetic field and 2.1 x JO5 currie/mm thermal neutron absorber, the crystalline structure reducted to 6.88% until 10.95% for 25 years period in 45.7 megawatts with UO2 more enrichment andPu2O also TH2Oy nuclear fuel element matrix."

"The functional of control rod blade nuclear reactor is stabilized device and controlling for nuclear chain reaction also the flux of thermal neutron in reactor chamber. Selecting materials based on Sr2 AI,;OV for multipurpose research reactor 50 megawatts determined by Ising Model software and programming written in Modula's language. This software consists are 4 main programmes and 38,700 sub-programmes. By simulation of Ising Model found Sr2 A1202, material. Based on Sr2 AI202_7, had been tested by Magnetic Stirrer equipment and combined with Ising Model expressed the material is Sr2 A12O1.8 . This material shown the strength of thermal neutron flux absorbed about 2.1 x 105 - 1.8 x 106 currie/mm. The values of Electrical Conductivity is 26.62 - 29.98 in 800° - 890° C temperature, however at 2.1 x 10' currielmmn thermal neutron flux condition is 29.44 -- 37.98 values in IAEA standard. At 450 testa magnetic field and 2.1 x 105 currie/mm thermal neutron absorber, the crystallization structure reduction is 6.88% until 10.95% for 25 years period in 45.7 megawatts. At present material is Zr-4 was substituted by this material, however the cost more cheaper than Zr-4. According datas, then the manufacturing design for control rod blade is investment casting and adhesive bounding with Sr2O2 substance for lining substance processes, compare with present material is casting and welding processes. The value of cubical raiser with sides 1.25 cm has the AIIV ratio as 4.8 cm' l (in standard is 4.1 cnf-') with the volume shrinkage of solidification is 3% for casting process. At joining has the radial tensile stress at the front hub fillet measuring 222 N/mm2 (in standard is 180 NImm2) and the value of tensile test is 405 MPa, meanwhile the standard around 390 MPa."

"Using the quantum approaching, the nuclear control rod wing shape optimization method based ancontrol theory in nuclear structure have been intensively developed especially in Canadian DeuteriumUranium (CANDU) nuclear research reactor. The control rod blade dimensions include 5 meters length, 0.80meters diameter, and 0. ll) meters thickness and it has the wing for thermal neutron reaction controlling at theCerenkov's radiation coming up. Moving on normally with 76 mm/second velocity. The floating of U particlein 2. l .r l05 currie/mm thermal neutron flux is one problem in nuclear control rod wing manufacturing. Basedon quantum approaching in transuranium nuclear chain control theory, the structural and thermal neutronflux flow is the best optimization technique for 450 tesla magnetic field weight and 45.7 MW adjusted power.This research purposed for new shape of nuclear control rod wing by several mathematical formulations havebeen modeled by Euler equations and build the miniature of control rod wing, then the angle has expectedaround 37.6° until 421° based on Sr20 matrix as the primer material and DUO; loading is the nuclearchamber:"

"Nuclear Magnetic Resonance (NMR) has been a fundamental player in the studies of superconducting materials for many decades. This local probe technique allows for the study of the static electronic properties as well as of the low energy excitations of the electrons in the normal and the superconducting state. On that account it has also been widely applied to Fe-based superconductors from the very beginning of their discovery in February 2008. This dissertation comprises some of these very first NMR results, reflecting the unconventional nature of superconductivity and its strong link to magnetism in the investigated compounds LaO1–xFxFeAs and LiFeAs."

"Permasalahan terbesar dalam pengendalian reaktor alir tangki berpengaduk adalah sistem yang sangat tidak linear dan multivariabel.Sistem pengendalian konvensional tidak dapat mengontrol sistem semacam ini dengan optimal, sehingga kemurnian produk yang dihasilkan rendah.Multiple Model Predictive Control (MMPC)digunakan untuk mengatasi masalah pengendalian proses yang nonlinear dan melibatkan banyak variabel. Beberapa MPC lokal digunakan pada MMPC diperoleh dengan metode yang baru dikembangkan, Representative Model Predictive Control (RMPC). Penelitian ini menggunakan model reaktor alir tangki berpengaduk yang disimulasikan dengan perangkat lunak MATLAB. Variabel yang dimanipulasi adalah suhu inlet pendingin dan konsentrasi umpan sedangkan variabel yang dikontrol adalah komposisi produk. Untuk perubahan set point konsentrasi produk dari 8,5 sampai 8,6; disarankan menggunakan MMPC 4,1,2.

---

The biggest problem in controlling Continuous Stirred Tank Reactor (CSTR) is nonlinearity in the system. Conventional control system can not optimally control this system, therefore decrease the purity of product. Multiple Model Predictive Control (MMPC), that can be used to control nonlinear and multivariable system, tried to be used on this system. Some local MPC used for MMPC based on new developed method, Representative Model Predictive Control (RMPC).

This thesis using CSTR model which is simulated by MATLAB software. The manipulated variable are cooler inlet temperature and feed concentration, and controlled variable is residual concentration. For the change of residual concentration set point from 8.5 to 8.6 change, the MMPC 4,1,2. is recommended."