Heart catheter cable and connector

Ultraminiature catheter cables that are stiff enough for intravenous insertion yet flexible at the tip, sterilizable, and economical are fabricated entirely from commercially available parts. Assembly includes air passageway for reference pressures and coaxial cable for transmission of signals from the tip of catheter

A Check-list of the Bats (Chiroptera) of Kenya colony

Volume: XXII

A Graphical Language for Proof Strategies

Complex automated proof strategies are often difficult to extract, visualise, modify, and debug. Traditional tactic languages, often based on stack-based goal propagation, make it easy to write proofs that obscure the flow of goals between tactics and are fragile to minor changes in input, proof structure or changes to tactics themselves. Here, we address this by introducing a graphical language called PSGraph for writing proof strategies. Strategies are constructed visually by "wiring together" collections of tactics and evaluated by propagating goal nodes through the diagram via graph rewriting. Tactic nodes can have many output wires, and use a filtering procedure based on goal-types (predicates describing the features of a goal) to decide where best to send newly-generated sub-goals. In addition to making the flow of goal information explicit, the graphical language can fulfil the role of many tacticals using visual idioms like branching, merging, and feedback loops. We argue that this language enables development of more robust proof strategies and provide several examples, along with a prototype implementation in Isabelle

Temperature-dependent resistivity of suspended graphene

In this paper we investigate the electron-phonon contribution to the resistivity of suspended single layer graphene. In-plane as well as flexural phonons are addressed in different temperature regimes. We focus on the intrinsic electron-phonon coupling due to the interaction of electrons with elastic deformations in the graphene membrane. The competition between screened deformation potential vs fictitious gauge field coupling is discussed, together with the role of tension in the suspended flake. In the absence of tension, flexural phonons dominate the phonon contribution to the resistivity at any temperature $T$ with a $T^{5/2}_{}$ and $T^{2}_{}$ dependence at low and high temperatures, respectively. Sample-specific tension suppresses the contribution due to flexural phonons, yielding a linear temperature dependence due to in-plane modes. We compare our results with recent experiments.Comment: 11 pages, 3 figure

A multi proxy investigation into the effects of burial environments on nuclear DNA in bone over forensic and archaeological timescales

This research conducted a two-pronged approach to study the effects of taphonomic processes by conducting analysis of experimental burials of porcine femora and parallel analysis of ancient human archaeological remains from geologically distinct cemeteries. The aim of this study was to identify the major degradative factors from depositional environments that affect the bone composition and the retention and retrieval of nucleic DNA from archaeological bone. Four different experimental burial environments of clay, compost, lime and sand were designed, displaying different properties of soil type, pH, water content and organic content. Analysis of the burial mediums and bones were conducted at regular intervals over an 18 month period. Observations of changes in the burial medium, comparisons of the rates and degree of soft tissue decomposition, bone diagenesis from compositional assessment, and bone colour change were made and analysed in correspondence with the different environments. The analytical data collected on the diagenesis of the archaeological bone from both studies, was compared to the DNA profiling success rates. The research and optimisation of sample preparation and DNA analysis enabled the most cost-effective and appropriate methods to be identified and utilised in accordance with the preservation state of the bone samples. This allowed the analysis of ancient archaeological bone to be analysed in-line with forensic protocols, to enable a uniform accessible approach to produce comparable results across different laboratories. Drawing together the results from the various analytical techniques made it possible to identify the variables that affect bone diagenesis and the survival of nuclear DNA, and provide evidence that the rate of decomposition and bone degradation is affected more significantly by the burial environment than duration of burial, as stated in the research hypothesis. The presence of water, sand and the level of organic content were found to be the most degradative variables within the experimental burial conditions; causing changes in bone crystallinity, and infiltration of contaminants into the bone. The presence of lime, chalk or limestone in an environment was found to have preserving properties in both the porcine and human burials, by retarding the rate and degree of soft tissue decomposition, and reducing the diagenetic changes in bone composition evident from the other environments. Despite previous reports of success using analytical techniques as predictive models for DNA and bone preservation, no correlations with DNA survival could be established. However the use of a multi-disciplinary approach enabled the detection and identification of soil contaminants affecting the bone structure and the ability to amplify DNA, in relation to burial environments. This research highlighted the importance of utilising multiple analytical techniques, such as colourimetry, ATR-FTIR, XRF and genetic analysis in order to avoid misinterpretation and false reporting of the state of bone diagenesis or preservation and the survival of DNA, due to environmental contaminants within the hard tissue. The research confirms the idea that in order to establish optimised sampling and DNA analysis of archaeological bone, it is imperative that certain protocols are adhered to. Precautions must be implemented from excavation through to laboratory analysis to avoid contamination; and correct recording of burial environment is essential to enable consideration of extrinsic factors and contaminants when reporting results

Evaluation of the cardiovascular system during various circulatory stresses Progress report, 1 Sep. 1968 - 1 May 1969

Cardiac response to chemotherapy after myocardial infraction and diagnostic methods of heart disease in man and animal

A new quantum fluid at high magnetic fields in the marginal charge-density-wave system α\alpha-(BEDT-TTF)2M_2MHg(SCN)4_4 (where M=M=~K and Rb)

Single crystals of the organic charge-transfer salts $\alpha$-(BEDT-TTF)$_2M$Hg(SCN)$_4$ have been studied using Hall-potential measurements ($M=$K) and magnetization experiments ($M$ = K, Rb). The data show that two types of screening currents occur within the high-field, low-temperature CDW$_x$ phases of these salts in response to time-dependent magnetic fields. The first, which gives rise to the induced Hall potential, is a free current (${\bf j}_{\rm free}$), present at the surface of the sample. The time constant for the decay of these currents is much longer than that expected from the sample resistivity. The second component of the current appears to be magnetic (${\bf j}_{\rm mag}$), in that it is a microscopic, quasi-orbital effect; it is evenly distributed within the bulk of the sample upon saturation. To explain these data, we propose a simple model invoking a new type of quantum fluid comprising a CDW coexisting with a two-dimensional Fermi-surface pocket which describes the two types of current. The model and data are able to account for the body of previous experimental data which had generated apparently contradictory interpretations in terms of the quantum Hall effect or superconductivity.Comment: 13 pages, 11 figure

Theoretical investigation of magnetoelectric effects in Ba2CoGe2O7

A joint theoretical approach, combining macroscopic symmetry analysis with microscopic methods (density functional theory and model cluster Hamiltonian), is employed to shed light on magnetoelectricity in Ba2CoGe2O7. We show that the recently reported experimental trend of polarization guided by magnetic field can be predicted on the basis of phenomenological Landau theory. From the microscopic side, Ba2CoGe2O7 emerges as a prototype of a class of magnetoelectrics, where the cross coupling between magnetic and dipolar degrees of freedom needs, as main ingredients, the on-site spin-orbit coupling and the spin-dependent O p - Co d hybridization, along with structural constraints related to the noncentrosymmetric structural symmetry and the peculiar configuration of CoO4 tetrahedrons.Comment: 5 pages, 4 figures, submitted for publicatio

Virtual EQ – the talent differentiator in 2020?

In an increasingly competitive, globalised world, knowledge-intensive industries/ services are seen as engines for success. Key to this marketplace is a growing army of ‘talent’ i.e. skilled and dedicated knowledge workers. These knowledge workers engage in non-routine problem solving through combining convergent, divergent and creative thinking across organizational and company boundaries - a process often facilitated though the internet and social media, consequently forming networks of expertise. For knowledge workers, sharing their learning with others through communities of practice embedded in new information media becomes an important element of their personal identity and the creation of their individual brand or e-social reputation. Part of the new knowledge/skills needed for this process becomes not only emotional intelligence (being attuned to the emotional needs of others) but being able to do this within and through new media, thus the emergence of virtual emotional intelligence (EQ). Our views of current research found that HRD practitioners in 2020 might need to consider Virtual EQ as part of their talent portfolio. However it seems that new technology has created strategies for capturing and managing knowledge that are readily duplicated and that a talent differentiator in 2020 might simply be the ability and willingness to learn