in this research, a new technetium-99m generator has been developed with addition of cerium oxide to alumina column.  the adsorption behaviors of 99mo in the form of molybdate and 99mtc in the form of pertechnetate on ceo2/al2o3 was investigated and showed that the adsorption capacity of molybdate on this generator is higher than usual generator using al2o3. ceric ions were selected as an addit...

background: hot lab is a specially designed room in a nuclear medicine hospital where the radiopharmaceuticals are delivered, stored and prepared for dispensing. 99mo/99mtc-generator is the major source in the hot lab used for various medical imaging. it is important to maintain a standard for hot lab procedures to optimize the patient care and minimize radiation exposure to all nuclear medicin...

This study presents a designing process for refurbishing of a 32 MW rotor-generator damaged coupling. The reason of rotor damage was being hit by the quivers of an explosion. The original coupling was union with the rotor formed after a machining process on a mono block forged rotor. In some areas imposed damages caused the breaking off and detachment of some parts in the coupling flange. Becau...

We present the construction of a pseudorandom generator, that we call the Bit-Search Generator (BSG), based on a single input sequence. The construction is related to the so-called Self-Shrinking Generator which is known for its simplicity (conception and implementation-wise) linked with some interesting properties. After presenting the general running, we give a description of the BSG by using...

(b) Usually (in practice), the k used for signing is not generated completely at random, but by using a pseudorandom generator. Again, in practice, people use a simple “pseudorandom” generator such as the linear congruential generator. A linear congruential generator LCG, on input a seed s0 outputs a sequence (s1, s2, . . . , sn) such that si = asi−1 + b(mod q). (where a and b are assumed to be...

In this research paper, the performance of an air-cored axial flux permanent magnet synchronous generator is evaluated for low speed, direct drive applications using 3D finite element modeling and experimental tests. The structure of the considered machine consists of double rotor and coreless stator, which results in the absence of core losses, reduction of stator weight and elimination of cog...

this paper presents the application of the matching pursuit method to model synchronous generator. this method is useful for online analysis. in the proposed method, the field voltage is considered as input signal, while the terminal voltage and active power of the generator are output signals. usually, the difference equation with a second degree polynomial structure is used to estimate the co...