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Low-Voltage CMOS Current Feedback Operational Amplifier and Its Application
Soliman A. Mahmoud,Ahmed H. Madian,Ahmed M. Soliman 한국전자통신연구원 2007 ETRI Journal Vol.29 No.2
A novel low-voltage CMOS current feedback operational amplifier (CFOA) is presented. This realization nearly allows rail-to-rail input/output operations. Also, it provides high driving current capabilities. The CFOA operates at supply voltages of ±0.75 V with a total standby current of 304 μA. The circuit exhibits a bandwidth better than 120 MHz and a current drive capability of ±1 mA. An application of the CFOA to realize a new all-pass filter is given. PSpice simulation results using 0.25 μm CMOS technology parameters for the proposed CFOA and its application are given.
Impact of fine particles on the rheological properties of uranium dioxide powders
Madian A.,Leturia M.,Ablitzer C.,Matheron P.,Bernard-Granger G.,Saleh K. 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.8
This study aims at characterizing the rheological properties of uranium oxide powders for nuclear fuel pellets manufacturing. The flowability of these powders must be compatible with a reproducible filling of press molds. The particle size distribution is known to have an impact on the rheological properties and fine particles (<100 mm) are suspected to have a detrimental effect. In this study, the impact of the particle size distribution on the rheological properties of UO2 powders was quantified, focusing on the influence of fine particles. Two complementary approaches were used. The first approach involved characterizing the powder in a static state: density, compressibility and shear test measurements were used to understand the behavior of the powder when it is transitioned from a static to a dynamic state (i.e., incipient flow conditions). The second approach involved characterizing the behavior of the powder in a dynamic state. Two zones, corresponding to two characteristic behaviors, were demonstrated for both types of measurements. The obtained results showed the amount of fines should be kept below 10 % wt to ensure a robust mold filling operation (i.e., constant mass and production rate).