Study of the Mechanisms of Flux Pinning in Type 2 Superconductors

Flux pinning mechanisms in type-2 semiconductors and specific heat measurements on annealed and deformed pure niobium sample

Three-coordinate iron(II) expanded ring N-heterocyclic carbene complexes

A sterically demanding seven-membered expanded ring N-heterocyclic carbene (NHC) ligand allows access to rare examples of three-coordinate iron(II)-NHC complexes incorporating only halide coligands of the general formula [Fe(NHC)X 2 ] (NHC = 7-DiPP; X = Br (1) Cl (2)). Reducing the steric influence of the ancillary NHC ligand through modulation of the N-aryl substituents leads to either four- or three-coordinate complexes of the general formula [Fe(NHC)Br 2 (THF)] (3) or [Fe(NHC)Br 2 ] (4) (NHC = 7-Mes), dependent upon the solvent of recrystallization. The further reduction of NHC steric influence results in four-coordinate geometries at iron in the form of the dimeric species [Fe(NHC)Br(μ-Br)] 2 (5) or [Fe(NHC)Br 2 (THF)] (6) (NHC = SDiPP), again dependent upon the solvent of recrystallization. Compounds 1-6 have been analyzed by 1 H NMR spectroscopy, X-ray crystallography, elemental microanalysis, Mössbauer spectroscopy (for 1 and 3-5), and Evans method magnetic susceptibility. In addition to these measurements the three-coordinate species 1 and 4 have been further analyzed by SQUID magnetometry and CASSCF calculations, which show significant magnetic anisotropy that is extremely sensitive to the coordination geometry

Are interactions between epicardial adipose tissue, cardiac fibroblasts and cardiac myocytes instrumental in atrial fibrosis and atrial fibrillation?

Atrial fibrillation is very common among the elderly and/or obese. While myocardial fibrosis is associated with atrial fibrillation, the exact mechanisms within atrial myocytes and surrounding non-myocytes are not fully understood. This review considers the potential roles of myocardial fibroblasts and myofibroblasts in fibrosis and modulating myocyte electrophysiology through electrotonic interactions. Coupling with (myo)fibroblasts in vitro and in silico prolonged myocyte action potential duration and caused resting depolarization; an optogenetic study has verified in vivo that fibroblasts depolarized when coupled myocytes produced action potentials. This review also introduces another non-myocyte which may modulate both myocardial (myo)fibroblasts and myocytes: epicardial adipose tissue. Epicardial adipocytes are in intimate contact with myocytes and (myo)fibroblasts and may infiltrate the myocardium. Adipocytes secrete numerous adipokines which modulate (myo)fibroblast and myocyte physiology. These adipokines are protective in healthy hearts, preventing inflammation and fibrosis. However, adipokines secreted from adipocytes may switch to pro-inflammatory and pro-fibrotic, associated with reactive oxygen species generation. Pro-fibrotic adipokines stimulate myofibroblast differentiation, causing pronounced fibrosis in the epicardial adipose tissue and the myocardium. Adipose tissue also influences myocyte electrophysiology, via the adipokines and/or through electrotonic interactions. Deeper understanding of the interactions between myocytes and non-myocytes is important to understand and manage atrial fibrillation

Predicting the Detectability of Thin Gaseous Plumes in Hyperspectral Images Using Basis Vectors

This paper describes a new method for predicting the detectability of thin gaseous plumes in hyperspectral images. The novelty of this method is the use of basis vectors for each of the spectral channels of a collection instrument to calculate noise-equivalent concentration-pathlengths instead of matching scene pixels to absorbance spectra of gases in a library. This method provides insight into regions of the spectrum where gas detection will be relatively easier or harder, as influenced by ground emissivity, temperature contrast, and the atmosphere. Our results show that data collection planning could be influenced by information about when potential plumes are likely to be over background segments that are most conducive to detection

Development of high energy batteries Final report

Development of battery systems with lithium anodes in nonaqueous electrolytes of propylene carbonate and potassium thiocyanat

‘Lost time’. Patients with Early Inflammatory/Rheumatoid Arthritis and their experiences of delays in Primary Care.

Background Early referral forms a crucial part in early inflammatory/rheumatoid arthritis (EI/RA) recovery. Delayed decisions to refer can lead to severe incapacity and emotional distress for individuals and family and feelings of lost time. How patients with EI/RA experience early referral decisions in Primary Care is an under explored area and warrants further investigation. Aim: To explore how patients newly diagnosed with EI/RA experienced their early contacts with Primary Care as they negotiated their journey through the referral process into secondary care. Design and setting Qualitative face to face interviews with newly diagnosed EI/RA patients Methods: In-depth semi-structured interviews were conducted to explore patients’ experiences of referral from first symptoms to GP referral All participants were interviewed within two weeks of being diagnosed in Secondary Care. Data analysis was conducted using Interpretative Phenomenological Analysis (IPA). Findings: All participants in this study described having experienced struggles with their navigation through Primary Care towards diagnosis and specialist EI/RA services. This struggle comprised 5 key elements: ‘Family persuasion, ‘Lack of continuity in care’, ‘Pushing for referral’, ‘Straining relationships’, ‘Lost time’. Conclusion: The delays experienced by patients when attempting to reach an early referral decision in Primary Care cause frustration for those presenting with EI/RA, partly because they do not feel heard. There is a significant impact on patients and their families when referral to specialist care is delayed