Experimental evidence of photoinduced valence change of Fe<SUP>3+</SUP> in BaTiO<SUB>3</SUB> and mechanism for growth of new grating in depleted pump condition: an EPR investigation

With a view to understanding the role of photo-induced valence changes of impurities in BaTiO3 in the phenomena of photorefraction, EPR experiments were conducted under in situ He-Ne laser illumination. These experiments gave evidence for photoinduced valence change of Fe in BaTiO3 at room temperature. The EPR signal due to trivalent iron was found to reduce in intensity with laser illumination The kinetics of the valence change has been investigated. Under large fringe width condition, the time constant of the decay is identified as the dielectric relaxation time &#932;d. The changes in line shape on laser illumination to Dysonian form, appeared most predominantly in mechanically poled crystal compared to electrically poled single domain crystals. This demonstrated the possible role of domain walls and the defects there, as source or sinks of charge carriers on photo excitation. It is observed, that there is transient growth of Fe3+, when the laser illumination was put on, before its decay. This was attributed to charge transfer between electrons in oxygen vacancies and Fe4+. This predicted the growth of a transient grating under depleted pump condition in a two beam coupling experiment. This was experimentally proved by following the diffracted signal of the reading beam under the depleted pump condition

Effect of blood glucose level on standardized uptake value (SUV) in F-18- FDG PET-scan : a systematic review and meta-analysis of 20,807 individual SUV measurements

Objectives To evaluate the effect of pre-scan blood glucose levels (BGL) on standardized uptake value (SUV) in F-18-FDG-PET scan. Methods A literature review was performed in the MEDLINE, Embase, and Cochrane library databases. Multivariate regression analysis was performed on individual datum to investigate the correlation of BGL with SUVmax and SUVmean adjusting for sex, age, body mass index (BMI), diabetes mellitus diagnosis, F-18-FDG injected dose, and time interval. The ANOVA test was done to evaluate differences in SUVmax or SUVmean among five different BGL groups (200 mg/dl). Results Individual data for a total of 20,807 SUVmax and SUVmean measurements from 29 studies with 8380 patients was included in the analysis. Increased BGL is significantly correlated with decreased SUVmax and SUVmean in brain (p <0.001, p <0.001,) and muscle (p <0.001, p <0.001) and increased SUVmax and SUVmean in liver (p = 0.001, p = 0004) and blood pool (p=0.008, p200 mg/dl had significantly lower SUVmax. Conclusion If BGL is lower than 200mg/dl no interventions are needed for lowering BGL, unless the liver is the organ of interest. Future studies are needed to evaluate sensitivity and specificity of FDG-PET scan in diagnosis of malignant lesions in hyperglycemia.Peer reviewe

Optimal sizing, siting and operation of custom power devices with STATCOM and APLC functions for real-time reactive power and network voltage quality control of smart grid

A new custom power device (CPD) is introduced for real-time control of reactive power and improving the overall network voltage quality of smart grid (SG) at fundamental and harmonic frequencies, respectively. The idea is to take advantage of the online smart meter data transmitted from each bus to the SG central control to concurrently perform the static synchronous compensator and the active power line conditioner operations by optimal compensations of fundamental reactive power and harmonic currents at selected optimal buses. The proposed strategy involves two particle swarm optimization algorithms. The first algorithm is implemented for the worse operating condition to determine the optimal locations and sizes of CPDs while the second algorithm relies on smart meter information to continuously compute fundamental and harmonic reference currents for real-time operation and control of the allocated CPDs. The objective functions are cost minimizations associated with bus voltage regulations, network total harmonic distortions voltage and custom device sizing while the constraints include upper limits for CPD sizes, fundamental, and harmonic bus voltages. Detailed simulations are performed in MATLAB/Simulink to evaluate the performances of allocated CPDs in controlling the reactive power and voltage quality of a distorted 15-bus SG with six nonlinear loads according to the IEEE-519 standard

Corrigendum to “Performance of LR-type solid-state fault current limiter in improving power quality and transient stability of power network with wind turbine generators” [International Journal of Electrical Power and Energy Systems 74 (2016) 172–187](S0142061515002872)(10.1016/j.ijepes.2015.07.001)

© 2017 In the published paper [1], the calculation process (presented equations) in Section “Stability analysis of induction machine with SSFCL-LR” is derived from the procedure proposed and explained in [2] . In this section, Eq. (12) of the published paper [1] presented below is based on Eq. (8) of [2] [Formula presented]

Levelized cost of energy and cash flow for a hybrid solar-wind-diesel microgrid on Rottnest island

This paper focuses on the selection of an appropriate standalone electricity supply system for a small island of Western Australia, Australia. To reduce the cost of electricity generation and to determine the most economically feasible solution for this island, several configurations are considered. The considered systems vary from a fully diesel generator-based option towards a hybrid system composed of diesel generators, wind turbines, solar farm and battery energy storage. Each system is analyzed by HOMER software and using the real demand data of the island, as well as the prices of different electrical components in the Australian market. The system which yields the minimum lev-elized cost of energy over the project's lifespan and the minimum net present cost is identified and suggested as the most economic option

Levelized cost of energy and cash flow for a hybrid solar-wind-diesel microgrid on Rottnest island

This paper focuses on the selection of an appropriate standalone electricity supply system for a small island of Western Australia, Australia. To reduce the cost of electricity generation and to determine the most economically feasible solution for this island, several configurations are considered. The considered systems vary from a fully diesel generator-based option towards a hybrid system composed of diesel generators, wind turbines, solar farm and battery energy storage. Each system is analyzed by HOMER software and using the real demand data of the island, as well as the prices of different electrical components in the Australian market. The system which yields the minimum lev-elized cost of energy over the project&#039;s lifespan and the minimum net present cost is identified and suggested as the most economic option

The Value of Radiologic Interventions and 18F- DOPA PET in Diagnosing and Localizing Focal Congenital Hyperinsulinism: Systematic Review and Meta-Analysis

Purpose: This systematic review and meta-analysis aimed to quantify the diagnostic performance of pancreatic venous sampling (PVS), selective pancreatic arterial calcium stimulation with hepatic venous sampling (ASVS), and 18F-DOPA positron emission tomography (PET) in diagnosing and localizing focal congenital hyperinsulinism (CHI). Procedures: This systematic review and meta-analysis was conducted according to the PRISMA statement. PubMed, EMBASE, SCOPUS and Web of Science electronic databases were systemat-ically searched from their inception to November 1, 2011. Using predefined inclusion and exclusion criteria, two blinded reviewers selected articles. Critical appraisal ranked the retrieved articles according to relevance and validity by means of the QUADAS-2 criteria. Pooled data of homogeneous study results estimated the sensitivity, specificity, likelihood ratios and diagnostic odds ratio (DOR). Results: 18F-DOPA PET was superior in distinguishing focal from diffuse CHI (summary DOR, 73.2) compared to PVS (summary DOR, 23.5) and ASVS (summary DOR, 4.3). Furthermore, it localized focal CHI in the pancreas more accurately than PVS and ASVS (pooled accuracy, 0.82 vs. 0.76, and 0.64, respectively). Important limitations comprised the inclusion of studies wit