2,097 research outputs found
Gaussian Process Learning-based Probabilistic Optimal Power Flow
In this letter, we present a novel Gaussian Process Learning-based
Probabilistic Optimal Power Flow (GP-POPF) for solving POPF under renewable and
load uncertainties of arbitrary distribution. The proposed method relies on a
non-parametric Bayesian inference-based uncertainty propagation approach,
called Gaussian Process (GP). We also suggest a new type of sensitivity called
Subspace-wise Sensitivity, using observations on the interpretability of
GP-POPF hyperparameters. The simulation results on 14-bus and 30-bus systems
show that the proposed method provides reasonably accurate solutions when
compared with Monte-Carlo Simulations (MCS) solutions at different levels of
uncertain renewable penetration as well as load uncertainties, while requiring
much less number of samples and elapsed time
Persistent currents in coupled mesoscopic rings
We have analysed the nature of persistent currents in open coupled mesoscopic
rings. Our system is comprised of two ideal loops connected to an electron
reservoir. We have obtained analytical expressions for the persistent current
densities in two rings in the presence of a magnetic field. We show that the
known even-odd parity effects in isolated single loops have to be generalised
for the case of coupled rings. We also show that when the two rings have
unequal circumferences, it is possible to observe opposite currents
(diamagnetic or paramagnetic) in the two rings for a given Fermi level.Comment: Submitted to PRB. 9 figures availabel on reques
Generation and Measurement of Non Equilibrium Spin Currents in Two Terminal Systems
Generation and measurement of non-equilibrium spin current in two probe
configuration is discussed. It is argued and shown that spin current can be
generated in two terminal non-magnetic system. Further it is shown that these
spin currents can be measured via conductance in two probe configuration when
the detector probe is ferromagnetic.Comment: 4 pages, 5 figure
Panel: COVID-19 Challenges to Project Management
COVID-19 has presented many new challenges and new opportunities for project management professionals and IT leaders. This panel will address these challenges and identify project management best practices and processes which have been effective in meeting these challenges. The panelists will share specific instances and challenges explaining how Project Cost Management, Time Management, Risk Management, Human Resources Management, and Risk Management have enabled them to manage during the pandemic and as a part of “return-to-work” scenarios. Hearing from these leaders as they accomplish digital transformations for their businesses and organizations will be an opportunity to bridge the gap between research and practice and to establish a dialogue between academic leaders and IT industry leaders which will provide many new questions to come
Applying dissipative dynamical systems to pseudorandom number generation: Equidistribution property and statistical independence of bits at distances up to logarithm of mesh size
The behavior of a family of dissipative dynamical systems representing
transformations of two-dimensional torus is studied on a discrete lattice and
compared with that of conservative hyperbolic automorphisms of the torus.
Applying dissipative dynamical systems to generation of pseudorandom numbers is
shown to be advantageous and equidistribution of probabilities for the
sequences of bits can be achieved. A new algorithm for generating uniform
pseudorandom numbers is proposed. The theory of the generator, which includes
proofs of periodic properties and of statistical independence of bits at
distances up to logarithm of mesh size, is presented. Extensive statistical
testing using available test packages demonstrates excellent results, while the
speed of the generator is comparable to other modern generators.Comment: 6 pages, 3 figures, 3 table
Antimoth finishing treatment for woollens using tannin containing natural dyes
Attempts have been made to develop natural dye based antimoth finishing process using natural dyes as an alternative of chemical based process. Natural dyes obtained from different sources are used to dye the woollen fabric and then screened for antimoth efficacy. Woollen fabrics dyed with extract of silver oak leaves, wall nut husk and pomegranate rind have shown highest resistance to moth attack. The screened sources carrying antimoth property are then subjected to phytochemical analysis along with non-carrying natural dyes for analyzing their chemical constituents. The result reveals that the chemical constituent of natural dyes plays a crucial role in determining antimoth efficacy. The amount of tannin content present in the natural dyes can be taken as an indicator to determine the antimoth efficacy
Efficacy of natural dye from Gerardiana diversifolia on pashmina (Cashmere) shawls
The present investigation deals with studies on potentiality of a colour extract from Gerardiana diversifolia as a source of natural dye, and on identification of chemical constituents responsible for dyeing ability. The efficacy of the extracted dye(s) on pashmina (Cashmere) fabrics has been evaluated for colour strength and fastness properties. Phytochemical studies reveal that the quinone and tannin are major components contributing to dyeing properties. The extracted colorant from Gerardiana diversifolia has potential to dye pashmina fabric with brown and grey shades having excellent wash and good to very good light fastness properties
Comparison between the two models of dephasing in mesoscopic systems
In mesoscopic systems to study the role of inelastic scattering on the phase
coherent motion of electrons two phenomenological models have been proposed. In
the first one, due to B\"uttiker, one adds a voltage probe into the system (or
in the scattering matrix). The second model invokes the complex (or optical)
potential in the system Hamiltonian. Studying a simple geometry of a metallic
loop in the presence of Aharonov-Bohm magnetic flux, we show that the two probe
conductance is symmetric in the reversal of the magnetic field in B\"uttiker's
approach. Whereas the two probe conductance within the complex potential model
is asymmetric in the magnetic flux reversal contrary to the expected behavior.Comment: 11 pages RevTex, 4 figures inculded, Communicated to PR
Blood glucose as a predictor of diarrheal dehydration in children
Background: Diarrhea remains the second leading cause of death globally among under 5 children. Historical clinical characteristics may not correlate to dehydration severity. Objectives: This study was done to evaluate the glycemic status of children having acute diarrhea with dehydration, at presentation, and to analyze the blood glucose as a predictor of the severity of diarrheal dehydration. Materials and Methods: Blood glucose levels were assessed in 150 children with acute diarrhea with dehydration, on admission. Results: Blood glucose levels showed statistically significant association with the degree of dehydration (p<0.05). Receiver operating characteristic curve analysis showed that blood glucose was a poor predictor of the severity of dehydration (area under curve [AUC] 0.240, 95% confidence interval [CI] = 0.050-0.429, standard error [SE] = 0.097) for some dehydration; and (AUC = 0.760, 95% CI = 0.571-0.950, SE = 0.097) for severe dehydration. Conclusion: Blood glucose is a poor predictor of the severity of diarrheal dehydration
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