Northern Illinois University

About: Northern Illinois University is a education organization based out in DeKalb, Illinois, United States. It is known for research contribution in the topics: Large Hadron Collider & Population. The organization has 8818 authors who have published 20008 publications receiving 632341 citations. The organization is also known as: NIU.

Definitional Issues and Mediating Variables in the Sexual Revictimization of Women Sexually Abused as Children

Abstract: This study examined the effect of child sexual abuse, defined three different ways, and three definitions of adult sexual assault on revictimization rates. Child definitions varied in the degree of contact; adult definitions varied in degree of contact and force used. Variables hypothesized to mediate the rate of revictimization included parental support, attributional style, coping style, severity of abuse, and involvement in psychotherapy. Subjects were 654 college females. Contact forms of child sexual abuse were associated with significant rates of revictimization, although noncontact child sexual abuse was not associated with revictimization. Revictimized women could not be discriminated from nonrevictimized women on the basis of the proposed mediating variables. Level of adult sexual experience was the best predictor of adult sexual assault. High levels of sexual activity is proposed as the link between child sexual abuse and adult sexual assault.

Exploiting hierarchy in parallel computer networks to optimize collective operation performance

Abstract: The efficient implementation of collective communication operations has received much attention. Initial efforts modeled network communication and produced "optimal" trees based on those models. However, the models used by these initial efforts assumed equal point-to-point latencies between any two processes. This assumption is violated in heterogeneous systems such as clusters of SMPs and wide-area "computational grids", and as a result, collective operations that utilize the trees generated by these models perform suboptimally. In response, more recent work has focused on creating topology-aware trees for collective operations that minimize communication across slower channels (e.g., a wide-area network). While these efforts have significant communication benefits, they all limit their view of the network to only two layers. We present a strategy based upon a multilayer view of the network. By creating multilevel topology trees we take advantage of communication cost differences at every level in the network. We used this strategy to implement topology-aware versions of several MPI collective operations in MPICH-G, the Globus-enabled version of the popular MPICH implementation of the MPI standard. Using information about topology discovered by Globus, we construct these topology-aware trees automatically during execution, thus freeing the MPI application programmer from having to write special files or functions to describe the topology to the MPICH library. We present results demonstrating the advantages of our multilevel approach by comparing it to the default (topology-unaware) implementation provided by MPICH and a topology-aware two-layer implementation.

The product of consecutive integers is never a power

Abstract: has no solution in integers with k >_ 2, 1 >_ 2 and n >_ 0 . (These restrictions on k, 1 and n will be implicit throughout this paper .) The early literature on this subject can be found in Dickson's history and the somewhat later literature in the paper of Oblath [5] . Rigge [6], and a few months later Erdos [1], proved the conjecture for 1 = 2 . Later these two authors [1] proved that for fixed 1 there are at most finitely many solutions to (1) . In 1940, Erdos and Siegel jointly proved that there is an absolute constant c such that (1) has no solutions with k > c, but this proof was never published . Later Erdos [2] found a different proof ; by improving the method used, we can now completely establish the old conjecture . Thus we shall prove

Activation of H2 by phosphinoboranes R2PB(C6F5)2.

Abstract: Phosphinoboranes that combine bulky electron-rich phosphides and electron deficient B(C6F5)2 fragments produce monomeric phosphinoboranes that undergo facile addition of H2 to give the phosphine-borane adducts (R2PH)(HBR'2). This finding in combination with DFT calculations shed light on the uptake of H2 across a group 13-group 15 bond, a critical requirement for the development of recyclable H2 storage materials.

Search for electroweak production of supersymmetric states in scenarios with compressed mass spectra at s=13 TeV with the ATLAS detector

Abstract: A search for electroweak production of supersymmetric particles in scenarios with compressed mass spectra in final states with two low-momentum leptons and missing transverse momentum is presented. This search uses proton-proton collision data recorded by the ATLAS detector at the Large Hadron Collider in 2015–2016, corresponding to 36.1 fb − 1 of integrated luminosity at √ s = 13 TeV . Events with same-flavor pairs of electrons or muons with opposite electric charge are selected. The data are found to be consistent with the Standard Model prediction. Results are interpreted using simplified models of R -parity-conserving supersymmetry in which there is a small mass difference between the masses of the produced supersymmetric particles and the lightest neutralino. Exclusion limits at 95% confidence level are set on next-to-lightest neutralino masses of up to 145 GeV for Higgsino production and 175 GeV for wino production, and slepton masses of up to 190 GeV for pair production of sleptons. In the compressed mass regime, the exclusion limits extend down to mass splittings of 2.5 GeV for Higgsino production, 2 GeV for wino production, and 1 GeV for slepton production. The results are also interpreted in the context of a radiatively-driven natural supersymmetry model with nonuniversal Higgs boson masses.