4,215 research outputs found
Dynamic double directional propagation channel analysis with dual circular arrays
Dynamic double directional propagation channel analysis with dual circular arrays. (pp. 6 p). Peer reviewed versio
A Distributed Transaction and Accounting Model for Digital Ecosystem Composed Services
This paper addresses two known issues for dynamically
composed services in digital ecosystems. The first
issue is that of efficient distributed transaction management.
The conventional view of transactions is unsuitable as the local
autonomy of the participants is vital for the involvement of
SMEs. The second issue is that of charging for such distributed
transactions, where there will often be dynamically created
services whose composition is not known in advance and might
involve parts of different transactions. The paper provides solutions
for both of these issues, which can be combined to provide
for a unified approach to transaction management and
accounting of dynamically composed services in digital ecosystems
The 'At-risk mental state' for psychosis in adolescents : clinical presentation, transition and remission.
Despite increased efforts over the last decade to prospectively identify individuals at ultra-high risk of developing a psychotic illness, limited attention has been specifically directed towards adolescent populations (<18 years). In order to evaluate how those under 18 fulfilling the operationalised criteria for an At-Risk Mental State (ARMS) present and fare over time, we conducted an observational study. Participants (N = 30) generally reported a high degree of functional disability and frequent and distressing perceptual disturbance, mainly in the form of auditory hallucinations. Seventy percent (21/30) were found to fulfil the criteria for a co-morbid ICD-10 listed mental health disorder, with mood (affective; 13/30) disorders being most prevalent. Overall transition rates to psychosis were low at 24 months follow-up (2/28; 7.1 %) whilst many participants demonstrated a significant reduction in psychotic-like symptoms. The generalisation of these findings may be limited due to the small sample size and require replication in a larger sample
Thermoelectric Behaviour Near Magnetic Quantum Critical Point
We use the coupled 2d-spin-3d-fermion model proposed by Rosch {\sl et. al.}
(Phys. Rev. Lett. {\bf 79}, 159 (1997)) to study the thermoelectric behaviour
of a heavy fermion compound when it is close to an antiferromagnetic quantum
critical point. When the low energy spin fluctuations are quasi two
dimensional, as has been observed in and , with a typical 2d ordering wavevector and 3d Fermi
surface, the ``hot'' regions on the Fermi surface have a finite area. Due to
enhanced scattering with the nearly critical spin fluctuations, the electrons
in the hot region are strongly renormalized. We argue that there is an
intermediate energy scale where the qualitative aspects of the renormalized hot
electrons are captured by a weak-coupling perturbative calculation. Our
examination of the electron self energy shows that the entropy carried by the
hot electrons is larger than usual. This accounts for the anomalous logarithmic
temperature dependence of specific heat observed in these materials. We show
that the same mechanism produces logarithmic temperature dependence in
thermopower. This has been observed in . We
expect to see the same behaviour from future experiments on .Comment: RevTex, two-column, 7 pages, 2 figure
Aqueous outflow imaging techniques and what they tell us about intraocular pressure regulation.
Recent advances in the medical and surgical management of open-angle glaucoma have increased the number of treatment options available. Several new intraocular pressure (IOP)-lowering treatments target the conventional aqueous outflow (AO) system. However, success rates are variable and outcomes in individual patients are often difficult to predict. Variable treatment responses remain unexplained and highlight deficiencies in our current understanding of AO regulation and IOP homeostasis. Imaging is often relied upon to confirm diagnoses and monitor treatment responses in other ocular and systemic pathologies. As yet no suitable AO imaging tool has been developed to fulfil this role in glaucoma. A variety of imaging techniques have been used to study the AO tracts of humans and animals in ex vivo and in vivo eyes. In this review, results from novel imaging techniques that assess aqueous drainage through the episcleral venous system are considered and we argue these provide new insights into AO regulation. We suggest that the ability to objectively measure AO responses to interventions would be a significant clinical advance, and we have demonstrated that this can be achieved with direct visualisation of aqueous drainage. We predict that the evolution of AO imaging technology will continue to reveal critical components of AO and IOP regulation, and that personalised IOP-lowering treatment in glaucoma care may well become a reality in the near future.1. A core support grant from the Wellcome Trust and MRC to the Wellcome
Trust â Medical Research Council Cambridge Stem Cell Institute
2. Haemoglobin Video Imaging facilities funded by Sydney Eye Hospital Foundation, Carl Zeiss Meditec, and Glaukos Corporatio
The morphological development of the 3 M. SG. Pronominal suffix on plural nouns in classical Hebrew: Part 1
© 2018 National Association of Professors of Hebrew. All Rights Reserved. This article is the first half of a study, continued in the next volume of Hebrew Studies. The 3 m. sg. pronominal suffix on plural nouns is realized in several allomorphs in Classical Hebrew: In early Hebrew inscriptions, the suffix appears as and perhaps as ; in Biblical Hebrew, it usually appears as (sometimes emended from in instances of Masoretic Qere readings), and occasionally as in poetic texts. In this study we provide a unified and principled linguistic account of these textual data, tracing the various phonological developments of the 3 m. sg. genitive suffix on plural nouns, and relating these phonological developments to the phonetic causes underlying them. After analyzing the phonological realizations of the high vocoids âU (/w/ and /u/) and âY (/y/ and /i/) and of âH (found in the third-person pronominal morphemes), we identify three stages of development that produced the in Biblical Hebrew: (1) the linkage of the number-gender morpheme to a single slot in the skeletal tier (effectively yielding an early diphthong contraction â-aI > Ä); (2) the deletion of âH in selected environments defined by accent and the surrounding vowels; and (3) the phonetically-motivated insertion of the glide ây in the hiatus environment [-e:w:]
Anomalous specific heat jump in the heavy fermion superconductor CeCoIn
We study the anomalously large specific heat jump and its systematic change
with pressure in CeCoIn superconductor. Starting with the general free
energy functional of the superconductor for a coupled electron boson system, we
derived the analytic result of the specific heat jump of the strong coupling
superconductivity occurring in the coupled electron boson system. Then using
the two component spin-fermion model we calculate the specific heat coefficient
both for the normal and superconducting states and show a good
agreement with the experiment of CeCoIn. Our result also clearly
demonstrated that the specific heat coefficient of a coupled electron
boson system can be freely interpreted as a renormalization either of the
electronic or of the bosonic degrees of freedom.Comment: 5 pages, 2 figure
Are All Measures of International Reserves Created Equal? An Empirical Comparison of International Reserve Ratios
Superior vena cava obstruction presenting with epistaxis, haemoptysis and gastro-intestinal haemorrhage in two men receiving haemodialysis with central venous catheters: two case reports
<p>Abstract</p> <p>Introduction</p> <p>Superior vena cava (SVC) obstruction secondary to central venous catheterization is an increasingly recognized complication.</p> <p>Case presentation</p> <p>We present two cases of superior vena cava obstruction secondary to indwelling central venous catheters used for haemodialysis access. One of the patients developed the unusual complications of torrential epistaxis and haemoptysis, which has been reported only once so far in the literature. The other patient developed melaena secondary to downhill oesophageal varices. We briefly discuss the pathophysiology, symptoms and signs, investigations and management of superior vena cava obstruction and thrombosis.</p> <p>Conclusion</p> <p>Increasing use of central venous access for haemodialysis will increase the incidence of central venous stenosis, thrombosis and exhaustion. Superior vena cava obstruction is likely to be an increasingly recognised complication of vascular access in the future.</p
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