57,627 research outputs found
The aging process modifies the distensibility of elastic but not muscular arteries
No full textAging decreases the distensibility of large elastic arteries; however, the effects of age on the functional parameters of muscular, medium-sized arteries are not well determined. This study evaluated the consequences of aging on the functional parameters of the carotid and radial arteries in normotensive men. A total of 62 elderly subjects (aged 74+/-2 years) were compared with 87 young subjects (aged 35+/-3 years). Internal diameter and intima-media thickness (IMT) were measured by a high-resolution echo-tracking system to calculate distensibility and incremental elastic modulus (Einc). Although in the normal range, systolic and diastolic blood pressure levels were statistically different in the 2 groups at 128+/-19 and 74+/-13 mm Hg versus 121+/-27 and 71+/-18 mm Hg in the young and elderly subjects, respectively (P<0.05). At the carotid artery level, elderly subjects exhibited a greater IMT (742+/-144 versus 469+/-132 microm; P<0.01) and internal diameter (7067+/-828 versus 6062+/-1026 microm; P<0.01) than young subjects; elderly subjects also had lower distensibility (12+/-2 versus 21+/-2 kPa(-1) x 10(-3); P<0.01) and higher Einc (0.9+/-0.2 versus 0.7+/-0.3 kPa x 10(3); P<0.01). At the radial artery level, both IMT (240+/-42 versus 218+/-51 microm; P<0.01) and internal diameter (2685+/-432 versus 2491+/-444 microm; P<0.01) were greater in elderly subjects, but no differences in distensibility and Einc were observed between the 2 groups. All differences remained significant, even after adjusting for mean blood pressure. These results indicate that the increase of the internal diameter and IMT observed during the aging process can have opposite effects on the functional parameters of large elastic or medium-sized muscular arteries
[Are the 1999 World Health Organization-International Society of Hypertension recommendations applicable to clinical practice?]
No full textThe aim of the 1999 WHO-ISH guidelines is to help the physicians in the management of hypertensive patients. The institution of antihypertensive treatment represents an important stage of this management sometimes at the detriment of lifestyle measures (non pharmacological treatments)
[The estimation of cardiovascular risk in hypertensive patients is not modified by management of the hypertension]
No full textTo compare antihypertensive therapeutic strategies and efficacy whether the physicians were aware or not of the calculated cardiovascular risk at 10 years obtained from the Framingham equation. It was also possible to evaluate the concordance of the general physicians estimation of the cardiovascular risk with the calculated percentage
Traces and shards of self-injury: Strange accounting with “Author X”
No full textIn this strange account autoethnography, three or four authors explore their lived experiences with self-injury. Strange accounting is both a post-modern style of text, and a method for keeping identities concealed when risks and secrets are in play. Author X, a post-modern place-keeper for an anonymous author who may or may not have contributed to this manuscript, introduces a new dimension and layer of concealment. With Author X in-play and under erasure, the reader will never be sure if there were three or four authors on this manuscript. Through strange accounting, a post-structuralist/postmodernist frame will be applied to understanding the self-injury experience. We frame self-injury as a social practice and, for some, an everyday norm, while remaining acutely aware of the stigma surrounding the topic of self-injury. Each of us, coupled with Author X, provide the others cover to trace stories of self-injury through the literature, our flesh, and our lives
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
Relations between x-ray timing features and spectral parameters of galactic black hole x-ray binaries
No full textWe present a study of correlations between spectral and timing parameters for a sample of black hole X-ray binary candidates. Data are taken from GX
339-4, H 1743-322, and XTE J1650-500, as the Rossi X-ray Timing Explorer
(RXTE) observed complete outbursts of these sources. In our study we investigate outbursts that happened before the end of 2009 to make use of the high-energy coverage of the HEXTE detector and select observations that
show a certain type of quasi-periodic oscillations (type-C QPOs). The spectral parameters are derived using the empirical convolution model simpl to model the Comptonized component of the emission together with a disc blackbody for the emission of the accretion disc. Additional spectral features, namely a reflection component, a high-energy cut-off, and excess emission at 6.4 keV, are taken into account. Our investigations confirm the known positive
correlation between photon index and centroid frequency of the QPOs and reveal an anti-correlation between the fraction of up-scattered photons and the QPO frequency. We show that both correlations behave as expected in the “sombrero”
geometry. Furthermore, we find that during outburst decay the correlation between photon index and QPO frequency follow a general track, independent of individual outbursts
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Enhanced colour encoding of materials discrimination information for multiple view dual-energy x-ray imaging
No full textThis thesis reports an investigation into dual-energy X-ray discrimination techniques. These techniques are designed to provide colour-coded materials discrimination information in a sequence of perspective images exhibiting sequential parallax. The methods developed are combined with a novel 3D imaging technique employing depth from motion or kinetic depth effect (KDE). This technique when applied to X-ray images is termed KDEX imaging and was developed previously by the university team for luggage screening applications at security checkpoints. A primary motivation for this research is that the dual-energy X-ray techniques, which are routinely incorporated into ‘standard’ 2D luggage scanners, provide relatively crude materials discrimination information. In this work it was critical that robust materials discrimination and colour encoding process was implemented as the sequential parallax exhibited by the KDEX imagery may introduce colour changes, due to the different X-ray beam paths associated with each perspective image. Any introduction of ‘colour noise’ into the resultant image sequences could affect the perception of depth and hinder the ongoing assessment of the potential utility of the dual-energy KDEX technique. Two dual-energy discrimination methods have been developed, termed K-II and W-E respectively. Employing the total amount of attenuation measured at each energy level and the weight fraction of layered structures, a combination of the K-II and the W-E techniques enables the computation and extraction of a target objects’ effective atomic number (Zeff) and its surface density (ρS) in the presence of masking layers
Student Project: Replication of Author, Author, & Author (201X, JDM, Study X) - Template
No full textThis project is an independent replication of Author, Author, & Author (201X, study X) conducted as part of the Hagen Cumulative Science Project
Author headings for the official publications of the State of Kansas
No full textIncludes bibliographical references (page x).This list of author headings covers all official agencies as found in the laws of the territory and the laws of the state of Kansas from May 30, 1854 through July 1955; also agencies created by Executive Order, and administrative divisions, or boards, created within a department of the state. Agencies included are:
1. All departments, bureaus, divisions, commissions, courts, legislative bodies and special committees created by the laws or joint resolutions of the territory or state of Kansas, or by Executive Order*
2. Subdivisions of the respective departments, bureaus, commissions and committees even though not expressly created by acts of the legislature, but which are included in the official reports of the agencies*
3. Legislative bodies and their committees, if created by law, or if their reports were published.
4. Societies supported wholly, or in part, by the state.
5. All state and territorial institutions (including educational, charitable, correctional and penal)
Securing XML documents with author-X
No full textAuthor-X is a Java-based system that addresses the security issues of access control and policy design for XML document administration. Author-X supports the specification of policies at varying granularity levels and the specification of user credentials as a way to enforce access control. Access control is available according to both push and pull document distribution policies, and document updates are distributed through a combination of hash functions and digital signature techniques. The Author-X approach to distributed updates allows a user to verify a document's integrity without contacting the document server
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