Odd Parity and Line Nodes in Heavy Fermion Superconductors

Group theory arguments have demonstrated that a general odd parity order parameter cannot have line nodes in the presence of spin-orbit coupling. In this paper, it is shown that these arguments do not hold on the $k_z = \pi/c$ zone face of a hexagonal close packed lattice. In particular, three of the six odd parity representations vanish identically on this face. This has potential relevance to the heavy fermion superconductor $UPt_3$.Comment: 5 pages, revte

Putting learning into practice: self-reflections from cops

Canterbury Christ Church University (CCCU) have been involved in police education with serving police officers for over twenty years. The College of Policing (COP) are currently considering a range of options to develop learning within the police organisation and this involves a drive for more officers to be degree educated. The responses to a recent public consultation on this proposal involved some differing views on its introduction. Some of the criticism coming from officers themselves about the proposal argues that there is a limited evidence base for degree level entry and this small study provides some insight into this world. This paper will discuss the findings from interviews conducted with police graduates from CCCU following their completion of either a BSc or MSc degree programme in Policing. It will discuss police officers’ perceptions of their ability to utilise the learning they have gleaned in the classroom and how it is received from their supervisors and peers. The aim of the drive to increase education in policing focuses on the need for students to develop critical thinking skills, to further apply knowledge and their problem solving abilities. The research found that police officer graduates felt these skills were enhanced as a result of undertaking a degree, and felt empowered to apply their knowledge. However, findings indicated inconsistencies as to whether this knowledge was applied in practice. This often depended on whether an officer’s immediate and senior management were receptive to embrace learning, more often than not there was a lack of willingness from management to ‘hear’ the learning from the police graduates interviewed in this study. Therefore, this research found that in order to embed knowledge systematically, a wider infrastructure is required to facilitate this at every rank of the police organisation

The effect of small-amplitude time-dependent changes to the surface morphology of a sphere

Typical approaches to manipulation of flow separation employ passive means or active techniques such as blowing and suction or plasma acceleration. Here it is demonstrated that the flow can be significantly altered by making small changes to the shape of the surface. A proof of concept experiment is performed using a very simple time-dependent perturbation to the surface of a sphere: a roughness element of 1% of the sphere diameter is moved azimuthally around a sphere surface upstream of the uncontrolled laminar separation point, with a rotational frequency as large as the vortex shedding frequency. A key finding is that the non-dimensional time to observe a large effect on the lateral force due to the perturbation produced in the sphere boundary layers as the roughness moves along the surface is ˆt =tU_(∞)/D ≈4. This slow development allows the moving element to produce a tripped boundary layer over an extended region. It is shown that a lateral force can be produced that is as large as the drag. In addition, simultaneous particle image velocimetry and force measurements reveal that a pair of counter-rotating helical vortices are produced in the wake, which have a significant effect on the forces and greatly increase the Reynolds stresses in the wake. The relatively large perturbation to the flow-field produced by the small surface disturbance permits the construction of a phase-averaged, three-dimensional (two-velocity component) wake structure from measurements in the streamwise/radial plane. The vortical structure arising due to the roughness element has implications for flow over a sphere with a nominally smooth surface or distributed roughness. In addition, it is shown that oscillating the roughness element, or shaping its trajectory, can produce a mean lateral force

Immune cells and preterm labour:do invariant NKT cells hold the key?

We have developed our original made-to-measure (M2M) algorithm, PRIMAL, with the aim of modelling the Galactic disc from upcoming Gaia data. From a Milky Way like N-body disc galaxy simulation, we have created mock Gaia data using M0III stars as tracers, taking into account extinction and the expected Gaia errors. In PRIMAL, observables calculated from the N-body model are compared with the target stars, at the position of the target stars. Using PRIMAL, the masses of the N-body model particles are changed to reproduce the target mock data, and the gravitational potential is automatically adjusted by the changing mass of the model particles. We have also adopted a new resampling scheme for the model particles to keep the mass resolution of the N-body model relatively constant. We have applied PRIMAL to this mock Gaia data and we show that PRIMAL can recover the structure and kinematics of a Milky Way like barred spiral disc, along with the apparent bar structure and pattern speed of the bar despite the galactic extinction and the observational errors

The Global Structure and Evolution of a Self-Gravitating Multi-phase Interstellar Medium in a Galactic Disk

Using high resolution, two-dimensional hydrodynamical simulations, we investigate the evolution of a self-gravitating multi-phase interstellar medium in the central kiloparsec region of a galactic disk. We find that a gravitationally and thermally unstable disk evolves, in a self-stabilizing manner, into a globally quasi-stable disk that consists of cold (T < 100 K), dense clumps and filaments surrounded by hot (T > 10^4 K), diffuse medium. The quasi-stationary, filamentary structure of the cold gas is remarkable. The hot gas, characterized by low-density holes and voids, is produced by shock heating. The shocks derive their energy from differential rotation and gravitational perturbations due to the formation of cold dense clumps. In the quasi-stable phase where cold and dense clouds are formed, the effective stability parameter, Q, has a value in the range 2-5. The dynamic range of our multi-phase calculations is 10^6 - 10^7 in both density and temperature. Phase diagrams for this turbulent medium are analyzed and discussed.Comment: 10 pages, 3 figures, ApJ Letters in press (vol. 516

Understanding risks: practitioner’s perceptions of the lottery of mental health care available for detainees in custody

Abstract The range of and growing number of health care requirements being presented within custody environments has been widely debated (Rekrut-Lapa and Lapa, 2014). Despite a number of reforms following the recommendations of the Bradley Review (2009) and the amendments made to the ACPO guidance on safe detention in 2012, research continues to highlight a lack of consistency to services available to effectively identify the needs of individuals in these arenas. This paper is based on part of a wider research project conducted in the Metropolitan Police Service and portrays the voice of the police practitioners working in custody suites. The research found that various notions of risk are central within this setting and that current practices are not sufficient for ensuring the safety of both detainees and officer safety. The research concludes by offering a proposal for capturing good practice and learning in order to create a more reflective and learning environment in custody suites

Impaired osteoblast differentiation in annexin A2- and -A5-deficient cells.

Annexins are a class of calcium-binding proteins with diverse functions in the regulation of lipid rafts, inflammation, fibrinolysis, transcriptional programming and ion transport. Within bone, they are well-characterized as components of mineralizing matrix vesicles, although little else is known as to their function during osteogenesis. We employed shRNA to generate annexin A2 (AnxA2)- or annexin A5 (AnxA5)-knockdown pre-osteoblasts, and determined whether proliferation or osteogenic differentiation was altered in knockdown cells, compared to pSiren (Si) controls. We report that DNA content, a marker of proliferation, was significantly reduced in both AnxA2 and AnxA5 knockdown cells. Alkaline phosphatase expression and activity were also suppressed in AnxA2- or AnxA5-knockdown after 14 days of culture. The pattern of osteogenic gene expression was altered in knockdown cells, with Col1a1 expressed more rapidly in knock-down cells, compared to pSiren. In contrast, Runx2, Ibsp, and Bglap all revealed decreased expression after 14 days of culture. In both AnxA2- and AnxA5-knockdown, interleukin-induced STAT6 signaling was markedly attenuated compared to pSiren controls. These data suggest that AnxA2 and AnxA5 can influence bone formation via regulation of osteoprogenitor proliferation, differentiation, and responsiveness to cytokines in addition to their well-studied function in matrix vesicles

Violence against women: public health or law enforcement problem or both?

Despite on-going research spanning many years, the police investigation of different forms of violence against women remains under review. The most recent reviews exploring sexual and domestic violence suggest that vulnerable victims are not identified effectively and that this subsequently impacts on the investigation, level of attrition and the provision of correct support for victims. The authors suggest that some of the current methods, aimed at improving these issues, can further compound problems within a police culture that often remains focused on narrow quantifiable performance targets. Violence against women involves a range of very complex issues and for most victims there are a number of vulnerabilities involved. Considering these factors are often related to public health concerns the authors argue for a more consistent and joined up approach to supporting victims through the Criminal Justice System. In the short term this is necessary for keeping victims on board with the process and in the longer term this is essential when dealing effectively with the broader, longer term issues impacting on their victimisation. It is crucial given the current fiscal climate that these issues are dealt with universally, with a focus on longer term outcomes