Discrete Temporal Models of Social Networks

We propose a family of statistical models for social network evolution over time, which represents an extension of Exponential Random Graph Models (ERGMs). Many of the methods for ERGMs are readily adapted for these models, including maximum likelihood estimation algorithms. We discuss models of this type and their properties, and give examples, as well as a demonstration of their use for hypothesis testing and classification. We believe our temporal ERG models represent a useful new framework for modeling time-evolving social networks, and rewiring networks from other domains such as gene regulation circuitry, and communication networks

Cosmic string gravitational waves from global U(1)B−LU(1)_{B-L} symmetry breaking as a probe of the type I seesaw scale

In type I seesaw models, the right-handed neutrinos are typically super-heavy, consistent with the generation of baryon asymmetry via standard leptogenesis. Primordial gravitational waves of cosmological origin provides a new window to probe high scale physics, which would otherwise be inaccessible. By considering a {\em global} $U(1)_{B-L}$ extension of the type I seesaw model, we explore the connection between neutrino mass and primordial gravitational waves arising from the dynamics of global cosmic string network. As a concrete example, we study a global $U(1)_{B-L}$ extension of the Littlest Seesaw model and show that the inevitable GW signals, if detectable, probe the parameter space that can accommodate neutrino oscillation data and successful leptogenesis, while respecting theoretical constraints like perturbativity of the theory. Including CMB constraints from polarization and dark radiation leaves a large regions of parameter space of the model, including the best fit regions, which can be probed by GW detectors like LISA and ET in the near future. In general, the GW detectors can test high scale type I seesaw models with the heaviest right-handed neutrino mass above $2.5 \times 10^{14}$ GeV, assuming the perturbativity, and $7 \times 10^{13}$ GeV assuming that the coupling between the heaviest right-handed neutrino and the $U(1)_{B-L}$ breaking scalar is less than unity.Comment: 25 pages including references, 3 figures, comments are welcom

The role of supply chain leadership in the learning of sustainable practice: toward an integrated framework

AcceptedArticleNOTICE: this is the author’s version of a work that was accepted for publication in Journal of Cleaner Production. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Cleaner Production doi:10.1016/j.jclepro.2014.10.029Sustainable supply chain management (SSCM) is a topic that has become increasingly important in recent years. However, very few papers focus on studying SSCM from both leadership and learning perspectives. In this research, we carry out a content-based literature review on the intersections of Supply Chain leadership, Supply Chain Learning and SSCM; we propose a conceptual framework on how focal companies assuming a leadership role initiate and disseminate sustainable practices in their supply chains. Three types of sustainable supply chain management (SSCM) strategies (i.e., reactive, contributive and proactive) have been identified in this research based on four dimensions of SSCM governance, supply chain learning, supply chain leadership and SSCM performance. It is argued that two new constructs of supply chain learning and supply chain leadership are an integral part of the SSCM conceptual framework developed from the literature and have significant implication to our understanding of SSCM

THE ROLE OF HUMERAL ELEVATION OF THE NON-THROWING ARM ON MAXIMUM BALL VELOCITY IN UNCONSTRAINED OVERARM THROW

The purpose of this study was to identify the role of humeral elevation of the non-throwing arm in relation to maximum ball velocity (MBV) in unconstrained overarm throws in children aged 12-14. 3D motion analysis was used to investigate the throwing technique of 144 students. The group was classified as ‘skilled’ or ‘less skilled’ based on MBV at release. Joints kinematics and timing of segmental sequencing (SS) based on maximum angular velocity (MAV) were quantified. Humeral elevation of the non-throwing arm had an important role in maximising ball release velocity. It had moderate to good correlation with MBV and MAV of other joints. ‘Skilled’ children were characterized by significantly more humeral elevation, MAV, faster humeral angular motions from an elevated position in the non-throwing arm and better SS in the throwing arm than the ‘less skilled’

Anti-colorectal cancer activity of an organometallic osmium arene azopyridine complex

This first in vivo antitumour activity for an organometallic osmium arene complex, [Os(eta(6)-p-cym)(4-(2-pyridylazo)-N,N-dimethylaniline)I]PF(6), is reported. The complex delays the growth of HCT116 human colon cancer xenografts in mice, with negligible toxicity. Its activity appears to involve redox mechanisms and its potency towards A2780 ovarian and A549 lung cancer cells is increased significantly in combination with L-buthionine-sulfoximine