We develop a new efficient numerical methodology for automated simultaneous registration and intensity correction of images. The approach separates the intensity correction term from the images being registered in a regularized expression. Our formulation is consistent with the existing non-parametric image registration techniques, however, an extra additive intensity correction term is carried throughout. An objective functional is formed for which the corresponding Hessian and Jacobian is computed and employed in a multi-level Gauss–Newton minimization approach. In this paper, our experiments are based on elastic regularization on the transformation and total variation on the intensity correction. Validations on dynamic contrast enhanced MR abdominal images for both real and simulated data verified the efficacy of the model. 相似文献
The X-Y axes, distributed-lumped model, for a machine tool system are derived. Model validations using measured results are presented. Adaptation of the model accommodating thereby the Z axis transmission is provided. The combined X-Y-Z axes response, for a cylindrical cutting operation, enabling an assessment of machining integrity, is detailed. Resonance conditions and the identification of adverse cutting frequencies are investigated. Dynamic amplification and the time domain performance of the system is determined. 相似文献
We propose novel techniques to find the optimal achieve the maximum loss reduction for distribution networks location, size, and power factor of distributed generation (DG) to Determining the optimal DG location and size is achieved simultaneously using the energy loss curves technique for a pre-selected power factor that gives the best DG operation. Based on the network's total load demand, four DG sizes are selected. They are used to form energy loss curves for each bus and then for determining the optimal DG options. The study shows that by defining the energy loss minimization as the objective function, the time-varying load demand significantly affects the sizing of DG resources in distribution networks, whereas consideration of power loss as the objective function leads to inconsistent interpretation of loss reduction and other calculations. The devised technique was tested on two test distribution systems of varying size and complexity and validated by comparison with the exhaustive iterative method (EIM) and recently published results. Results showed that the proposed technique can provide an optimal solution with less computation. 相似文献
We report on the magnetic exchange coupling behavior in hard-soft Mn52Al45.7C2.3-α-Fe nanocomposite magnets synthesized by high-energy ball milling at room temperature followed by post-annealing treatment at temperatures 300 to 600 °C. The analysis of hysteresis loops showed effective exchange coupling Mn52Al45.7C2.3-α-Fe nanocomposite particles with smooth demagnetizing curves when annealed at 400 °C. But higher annealing temperatures pose kink in the hysteresis loop highlighting a weak exchange coupling with more magnetostatic interaction between hard and soft components. This trend was confirmed by the results on (BH)max, which had the highest value for nanocomposite particles annealed at 400 °C. More detailed information on magnetic exchange coupling in nanocomposite particles was obtained by derivative magnetic curves and Henkel plots. Hard-soft Mn52Al45.7C2.3-α-Fe magnets showed the sharpest high-field maximum in derivate magnetic curves when annealed at 400 °C as a signature of effective exchange coupling between Mn52Al45.7C2.3 and α-Fe grains. In addition, Henkel plots display the dominance of positive peak for nanocomposite particles annealed at 300 and 400 °C, indicative of magnetic exchange-coupling. But the negative-peak dominated curves of those annealed at higher temperatures as well as single-phase Mn52Al45.7C2.3 imply a significant magnetostatic interaction in the components owing to non-magnetic phases formed at elevated temperatures. Also, quantitative information obtained from recoil curve measurements assigned a higher degree of exchange coupling to nanocomposite magnets when annealed at 400 °C.
Ultrasonic wave velocities were determined at parallel and perpendicular to manufacturing direction and at the interval angles
of 15° in clockwise and counterclockwise directions of particleboard and fiberboard. The experimental results were compared
with the predicted values using some empirical formulae such as Hankinson and Jacoby equations. The results showed that the
ultrasonic wave velocity were the highest in parallel direction in particleboard and fiberboard and decreases with increase
of angle and the lowest values occurred in perpendicular direction. The predicted ultrasonic velocity using Hankinson and
Jacoby equations are in close agreement with the measured values. Relationship between ultrasonic wave velocities and particles
and fibers angle could be successfully presented by cubic and quadratic regression equations as well. 相似文献
The separation of water from diesel fuel is very important for safety, ecological, and economic reasons, as otherwise it can lead to lower combustion efficiency and engine problems. In addition, the free water from ultra‐low‐sulfur diesel (ULSD) can only be insufficiently separated with the classic separation systems. To solve this problem, a membrane process with different organic/inorganic membranes for the selective separation of water droplets from ULSD and an innovative water‐in‐oil online sensor were developed. 相似文献
Al–Mg alloys were deposited using a base-electrolyte with the composition Na[AlEt4] + 2Na[Et3Al–H–AlEt3] + 2.5AlEt3 + 6toluene (where Et = −C2H5). Mg was introduced into this electrolyte by employing a pure Mg anode. It was found that initially the amount of Mg in the
electrolyte increased with the deposition time but eventually a steady state was reached such that the amount of Mg dissolved
at the anode became equal to that deposited at the cathode. Compositional and phase analyses indicated that this state is
achieved at a critical Mg/Al ratio that resulted in the formation of the hcp Mg-rich phase. By devising various component
electrolytes we have attempted to understand the roles of different compounds in the base-electrolyte and have proposed a
scheme for the Al–Mg alloy deposition. 相似文献