A comparative study on the traditional and intensive delivery of an online course: Design and facilitation recommendations

© 2019 P. Vlachopoulos et al. In this paper, we present findings from a comparative study on a fully online postgraduate course offered in traditional (i.e. 13-week academic session) and intensive (i.e. 6-week academic session) delivery formats. Keeping the course curriculum, structure and quality consistent in both delivery modes, the study investigated student participation and academic performance given different facilitation techniques applied to the discussion forums. Using data from the learning management system and students’ final marks, we conducted quantitative and qualitative analysis and found no difference in the academic performance of students in both courses; however, there was a statistically significant relationship between student participation and academic performance in the intensive delivery format but not in the traditional delivery format. We also found differences in the type of interactions in the different delivery formats. Two key takeaways emerge from our study. Firstly, intensive online courses can be as effective as traditional courses in terms of achievement of learning outcomes with variations in learning design, in this case, the facilitation approach used. Secondly, considering the level and nature of interactions, student-centred discussion forums that allow students to assume different roles work well in the intensive delivery format especially in open discussions. These are important findings for academics and practitioners who wish to offer intensive courses without compromising on course quality and student success

Europe�s New Fiscal Rules

Europe has put in place a new system of complex fiscal rules. These include the so-called �six pack� to upgrade the Stability and Growth Pact and a new Treaty incorporating the �fiscal compact�. Much of the discussion about the new rules has been procedural or theoretical. This paper shows what the rules will mean in practice under a medium-term scenario developed by the OECD. So far, fiscal consolidation has largely been driven by the recent wave of Excessive Deficit Procedures. Only once these commitments have been fulfilled will the new system of rules come into action. Its pillar will be the requirement to balance budgets in structural terms. The rules imply a tight fiscal stance over the coming years for many European countries by historical standards. Almost all countries will have to be as disciplined as the few countries that managed to make meaningful progress in tackling high debt levels in the past. Over the very long term, the rules imply extremely low levels of debt. Thus, the requirements are not likely to be permanent. The rules are complex. The methodology to calculate the structural balance has a number of weaknesses and discretion will be needed in implementing the rules

The conformal current algebra on supergroups with applications to the spectrum and integrability

We compute the algebra of left and right currents for a principal chiral model with arbitrary Wess-Zumino term on supergroups with zero Killing form. We define primary fields for the current algebra that match the affine primaries at the Wess-Zumino-Witten points. The Maurer-Cartan equation together with current conservation tightly constrain the current-current and current-primary operator product expansions. The Hilbert space of the theory is generated by acting with the currents on primary fields. We compute the conformal dimensions of a subset of these states in the large radius limit. The current algebra is shown to be consistent with the quantum integrability of these models to several orders in perturbation theory.Comment: 45 pages. Minor correction

Mesh-Free Laparoscopic High Uterosacral Ligament Suspension during Total Laparoscopic Hysterectomy for Uterine Prolapse.

STUDY OBJECTIVE: To demonstrate a mesh-free approach for uterine prolapse during a hysterectomy. DESIGN: Technical video (Canadian Task Force classification III). SETTING: Benign gynecology department at a university hospital. PATIENT: A 50-year-old woman. INTERVENTION: Laparoscopic high uterosacral ligament suspension technique. MEASUREMENTS AND MAIN RESULTS: A 50-year-old woman presented with irregular vaginal bleeding and grade 3 uterine prolapse. The patient was concerned regarding the use of mesh and erosion. After counseling the patient agreed to a mesh-free single procedure. The use of mesh for the treatment of pelvic organ prolapse has become the subject of controversy and litigation. Complications of mesh erosion have resulted in the US Food and Drug Administration reclassifying transvaginal meshes as high-risk devices in 2016 [1]. Mesh erosion risk is up to 23% with hysterectomy and concomitant laparoscopic sacrocolpopexy [2] and 3% with sacrohysteropexy [3]. We present an alternative laparoscopic approach of treating uterine prolapse with high uterosacral suspension during laparoscopic hysterectomy. Our method avoids the use of mesh, sacrocervicopexy and morcellation, or an interval sacrocolpopexy. Although high uterosacral ligament suspension can be performed vaginally, it carries up to an 11% risk of ureteric injury [4]. CONCLUSION: In this video a bilateral ureterolysis is performed, before hysterectomy, isolating the uterosacral ligaments. These are then suspended to the vaginal vault in a purse-string fashion using Vicryl 0 (polyglactin 910) and intracorporeal knot-tying. Postprocedure the vault is well supported with a vaginal length of 12 cm

Massless particles on supergroups and AdS3 x S3 supergravity

Firstly, we study the state space of a massless particle on a supergroup with a reparameterization invariant action. After gauge fixing the reparameterization invariance, we compute the physical state space through the BRST cohomology and show that the quadratic Casimir Hamiltonian becomes diagonalizable in cohomology. We illustrate the general mechanism in detail in the example of a supergroup target GL(1|1). The space of physical states remains an indecomposable infinite dimensional representation of the space-time supersymmetry algebra. Secondly, we show how the full string BRST cohomology in the particle limit of string theory on AdS3 x S3 renders the quadratic Casimir diagonalizable, and reduces the Hilbert space to finite dimensional representations of the space-time supersymmetry algebra (after analytic continuation). Our analysis provides an efficient way to calculate the Kaluza-Klein spectrum for supergravity on AdS3 x S3. It may also be a step towards the identification of an interesting and simpler subsector of logarithmic supergroup conformal field theories, relevant to string theory.Comment: 16 pages, 10 figure

A New Algorithm for Distributed Generator (DG) Placement and Sizing for Distribution Systems

In today’s distribution grids the number of distributed generation units is increasing rapidly. Combined heat and power (CHP) plants and wind turbines are most often installed. Integration of these DG units into the distribution grid leads to planning as well as operational challenges. In this paper proposed a new algorithm for Distributed Generator (DG) placement and sizing for distribution systems based on a novel index. The index is developed considering stable node voltages referred as power stability index (PSI). A new analytical approach is adopted to visualize the impact of DG on system losses, voltage profile and voltage stability. The proposed algorithm is tested on 12-bus, modified 12- bus and 69-bus radial distribution networks. The test results are also compared and found to be in close agreement with the existing Golden Section Search (GSS) algorithm

AN OBLIGATORY ROLE OF MIND BOMB-1 IN NOTCH SIGNALING OF MAMMALIAN DEVELOPMENT

Background. The Notch signaling pathway is an evolutionarily conserved intercellular signaling module essential for cell fate specification that requires endocytosis of Notch ligands. Structurally distinct E3 ubiquitin ligases, Neuralized (Neur) and Mind bomb (Mib), cooperatively regulate the endocytosis of Notch ligands in Drosophila. However, the respective roles of the mammalian E3 ubiquitin ligases, Neur1, Neur2, Mib1, and Mib2, in mammalian development are poorly understood. Methodology/Principal Findings. Through extensive use of mammalian genetics, here we show that Neur1 and Neur2 double mutants and Mib2 2/2 mice were viable and grossly normal. In contrast, conditional inactivation of Mib1 in various tissues revealed the representative Notch phenotypes: defects of arterial specification as deltalike4 mutants, abnormal cerebellum and skin development as jagged1 conditional mutants, and syndactylism as jagged2 mutants. Conclusions/Significance. Our data provide the first evidence that Mib1 is essential for Jagged as well as Deltalike ligand-mediated Notch signaling in mammalian development, while Neur1, Neur2, and Mib2 are dispensable.open117978Nsciescopu

Projecting impacts of climate change on metal mobilization at contaminated sites: Controls by the groundwater level

Heavy metal and metalloid contamination of topsoils from atmospheric deposition and release from landfills, agriculture, and industries is a widespread problem that is estimated to affect >50% of the EU\u27s land surface. Influx of contaminants from soil to groundwater and their further downstream spread and impact on drinking water quality constitute a main exposure risk to humans. There is increasing concern that the present contaminant loading of groundwater and surface water systems may be altered, and potentially aggravated, by ongoing climate change, through large-scale impacts on recharge and groundwater levels. We investigated this issue by performing hydrogeological-geochemical model projections of changes in metal(loid) (As and Pb) mobilization in response to possible (climate-driven) future shifts in groundwater level and fluctuation amplitudes. We used observed initial conditions and boundary conditions for contaminated soils in the temperate climate zone. The results showed that relatively modest increases (0.2 m) in average levels of shallow groundwater systems, which may occur in Northern Europe within the coming two decades, can increase mass flows of metals through groundwater by a factor of 2–10. There is a similar risk of increased metal mobilization in regions subject to increased (seasonal or event-scale) amplitude of groundwater levels fluctuations. Neglecting groundwater level dynamics in predictive models can thus lead to considerable and systematic underestimation of metal mobilization and future changes. More generally, our results suggest that the key to quantifying impacts of climate change on metal mobilization is to understand how the contact between groundwater and the highly water-conducting and geochemically heterogeneous topsoil layers will change in the future

Ground states of dispersion-managed nonlinear Schrodinger equation

An exact pulse for the parametrically forced nonlinear Schrodinger equation (NLS) is isolated. The equation governs wave envelope propagation in dispersion-managed fiber lines with positive residual dispersion. The pulse is obtained as a ground state of an averaged variational principle associated with the equation governing pulse dynamics. The solutions of the averaged and original equations are shown to stay close for a sufficiently long time. A properly adjusted pulse will therefore exhibit nearly periodic behavior in the time interval of validity of the averaging procedure. Furthermore, we show that periodic variation of dispersion can stabilize spatial solitons in a Kerr medium and one-dimensional solitons in the NLS with quintic nonlinearity. The results are confirmed by numerical simulations