Water saturation and cation exchange capacity are the most significant parameters used to calculate a hydrocarbon zone potential. In clean formations, by applying the famous Archie model, which assumes that in the formation the only electric conductor is the formation water, the water saturation can be calculated. Additionally, in shaly sand formations this assumption may not be true as the ion...

reverse redistribution pattern is defined as decreased activity in the myocardium in the rest phase of the myocardial perfusion scan in comparison with the stress images. there are many studies concerning the etiology and clinical significant of this phenomenon in nuclear medicine literature. the dominant idea about etiology of reverse redistribution is early wash out of the radiotracer from th...

We propose and fabricate a silicon based dual-detector optical receiver, which consists of a two dimensional (2D) grating coupler (GC) and two separate germanium photodetectors (Ge PDs). The 2D GC performs polarization diversity, and thus demultiplexing and detection for polarization division multiplexed (PDM) signals can be achieved. Through a specific design with double-sides illumination, th...

Current–voltage measurements of Au contacts deposited on ex situ cleaned, n-type ZnO!0001" #!0001̄"$ surfaces showed reverse bias leakage current densities of %0.01 !%0.1" A/cm2 at 4.6 !3.75" V reverse bias and ideality factors !2 !both surfaces" before sharp, permanent breakdown !soft breakdown". This behavior was due primarily to the presence of !1.6–2.0"±0.1 #!0.7–2.6"±0.1$ monolayers !ML" of...

Abstract The formation control problem for a group of first-order agents with model uncertainty and actuator saturation is investigated in this manuscript. An algorithm-and-observer-based controller developed to ensure the semi-global boundedness tracking error saturation. First, fully local-error-related cooperative weight tuning procedure proposed adaptive estimation each agent. effect on bot...

This research is focused on a new type of three junction high efficiency solar cell incorporating the promising Si-Ge material as bottom layer. As proof concept, proposed has been configured with quality bandgaps 1.9 eV GaInP2 and 1.42 GaAs top middle subcells 0.838 bandgap semiconductor Si0.38Ge0.62 subcell. The chosen materials for this configuration are lattice matched (5.66 A) matching bene...

The paper presents a new algorithm, its implementation, and results of extensive testing, for a microprocessor-based lowimpedance busbar relay. For increased security, the presented technique combines percent differential and current directional protection principles. The directional (phase comparison) principle does not require a voltage signal as it responds to relative directions of the curr...

Multiple coupled circuit modeling of squirrel-cage induction motors, or winding function approach is the most detailed and complete analytical model used to analyze the performance of the faulty induction motors. This paper extends the above-mentioned model to a saturable model including variable degrees of the saturation effects using an appropriate air gap function and novel techniques for lo...

A new torque control strategy for brushless motors with minimum torque ripple and minimum copper losses while maintaining the phase currents under magnetic (or current) saturation is presented. The optimal control { a nonlinear map from desired torque and position to the motor's phase currents { is the closed form solution to a quadratic programming problem. Experimental results demonstrate vir...