2,732 research outputs found
Tensile and fatigue properties of Inconel 718 at cryogenic temperatures
Tests to determine the tensile and fatigue properties of Inconel 718 at cryogenic temperatures show that the alloy increases in strength at low temperatures, with very little change in toughness. The effect of surface finish and grain size on the fatigue properties was also determined
Divide and color representations for threshold Gaussian and stable vectors
We study the question of when a (\{0,1\})-valued threshold process associated
to a mean zero Gaussian or a symmetric stable vector corresponds to a {\it
divide and color (DC) process}. This means that the process corresponding to
fixing a threshold level and letting a 1 correspond to the variable being
larger than arises from a random partition of the index set followed by
coloring {\it all} elements in each partition element 1 or 0 with probabilities
and , independently for different partition elements.
While it turns out that all discrete Gaussian free fields yield a DC process
when the threshold is zero, for general -dimensional mean zero, variance one
Gaussian vectors with nonnegative covariances, this is true in general when
but is false for .
The behavior is quite different depending on whether the threshold level
is zero or not and we show that there is no general monotonicity in in
either direction. We also show that all constant variance discrete Gaussian
free fields with a finite number of variables yield DC processes for large
thresholds.
In the stable case, for the simplest nontrivial symmetric stable vector with
three variables, we obtain a phase transition in the stability exponent
at the surprising value of ; if the index of stability is larger
than , then the process yields a DC process for large while if the
index of stability is smaller than , then this is not the case.Comment: 51 pages, 6 figures This paper together with arXiv:1911.00513,
arXiv:1910.09813 and arXiv:1909.11322 replace the first version of this pape
Protecting Childhood: Examining European Policies on the Commercial Sexual Exploitation of Children
Children account for more than one-fourth of all people in forced commercial sexual exploitation and for one-third of all discovered trafficked individuals, rising to fifty percent in low-income countries. Moreover, child sex trafficking has only increased over the years, with many European countries predominantly recognized as destination and transit countries for commercial sexual exploitation. This paper examines and evaluates the current methods of reducing and preventing sex trafficking and the commercial sexual exploitation of children in Europe. Next, it holistically analyzes and reviews the issue globally, determining each strategy’s overall efficacy, practicality, and potential downsides. These strategies call for greater international cooperation, mobilization of resources, and strengthening and implementing effective laws and policies. As a result, the following recommendations are made: integrating children’s voices in policy-making, creating a multi-stakeholder response, and focusing on demand reduction for child sexual abuse material.https://digitalcommons.salve.edu/glo100/1003/thumbnail.jp
Seasonal variability in non-consumptive mortality of Arctic zooplankton
Recent observations from high-latitude marine ecosystems indicate that non-consumptive mortality may be particularly high in Arctic zooplankton during the polar night. Here we have estimated the contribution of dead organisms to the mesozooplankton community in the high Arctic (Svalbard 78–81oN) during the polar night (January), in spring (May) and in late summer (end of August). To identify in situ dead organisms, we used Neutral Red Stain. The dead zooplankton fraction consisted mainly of copepods, while the contribution of dead non-copepods was low in all seasons. The absolute abundance of dead copepods varied little between seasons; however, the relative contribution of dead copepods was highest in January with 11–35% of the copepods classified as dead, in contrast to 2–12% in spring and summer. Furthermore, there were species-specific differences: copepods of the genus Calanus contributed more to the dead fraction of the copepod community during the polar night compared to spring and summer, leading to a higher “dead” biomass in winter. We conclude that non-consumptive winter mortality is considerable in calanoid copepods in the Arctic and an important but so far neglected component of the passive carbon flux, providing carbon in larger portions for higher trophic level consumers during the low-productive winter
Readiness for Discharge in Parents of Hospitalized Children
Parental preparation for a child\u27s discharge from the hospital sets the stage for successful transitioning to care and recovery at home. In this study of 135 parents of hospitalized children, the quality of discharge teaching, particularly the nurses\u27 skills in “delivery” of parent teaching, was associated with increased parental readiness for discharge, which was associated with less coping difficulty during the first 3 weeks postdischarge. Parental coping difficulty was predictive of greater utilization of posthospitalization health services. These results validate the role of the skilled nurse as a teacher in promoting positive outcomes at discharge and beyond the hospitalization
An Unfinished Canvas: Allocating Funding and Instructional Time for Elementary Arts Education
An Unfinished Canvas found that California's elementary schools face unique challenges inproviding all students with sequential, standards-based arts education. In particular, elementary principals identified inadequate funding and insufficient instructional time as significant barriers to the provision of arts education. For this study, we sought to further understand the impact of funding and time on elementary arts education. To do so, we examined the allocation of funding and instructional time in 10 schools across five states (Kentucky, Massachusetts, Minnesota, New Jersey, and California)
Hermitian Young Operators
Starting from conventional Young operators we construct Hermitian operators
which project orthogonally onto irreducible representations of the (special)
unitary group.Comment: 15 page
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