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Search Results: 1 - 10 of 483514 matches for " Martin A. Sharp "
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Sex-Role Orientation in Men Is Related to Salivary Testosterone Levels  [PDF]
Miriam J. Law Smith, Denis K. Deady, Martin A. Sharp, Emad A. S. Al-Dujaili
Journal of Behavioral and Brain Science (JBBS) , 2013, DOI: 10.4236/jbbs.2013.37054
Abstract: Previous research has implicated the involvement of androgens in sex-role orientation in males, from studies of 2nd to 4th digit ratio (a purported marker of prenatal testosterone). The present pilot study investigates the relationship between salivary testosterone levels and sex-role orientation using Bem Sex Role Inventory (BSRI) scores in adult males. Twenty-one males (aged 18-24) completed the BSRI and provided saliva samples for assay. BSRI Femininity scores were significantly negatively correlated with testosterone levels; the higher the Femininity scores, the lower the testosterone levels. There was no relation of BSRI Masculinity scores with testosterone levels. Our preliminary results add to the research suggesting that sex-role orientation in males may be partially related to underlying hormone levels.
Polynesiyrs in de Pacific: A comment
A. Sharp
Bijdragen tot de Taal-, Land- en Volkenkunde , 1964,
High-Transconductance Graphene Solution-Gated Field Effect Transistors
Lucas H. Hess,Moritz V. Hauf,Max Seifert,Florian Speck,Thomas Seyller,Martin Stutzmann,Ian D. Sharp,Jose A. Garrido
Physics , 2011, DOI: 10.1063/1.3614445
Abstract: In this work, we report on the electronic properties of solution-gated field effect transistors (SGFETs) fabricated using large-area graphene. Devices prepared both with epitaxially grown graphene on SiC as well as with chemical vapor deposition grown graphene on Cu exhibit high transconductances, which are a consequence of the high mobility of charge carriers in graphene and the large capacitance at the graphene/water interface. The performance of graphene SGFETs, in terms of gate sensitivity, is compared to other SGFET technologies and found to be clearly superior, confirming the potential of graphene SGFETs for sensing applications in electrolytic environments.
Chemical Equilibrium Abundances in Brown Dwarf and Extrasolar Giant Planet Atmospheres
A. Burrows,C. Sharp
Physics , 1998, DOI: 10.1086/306811
Abstract: We calculate detailed chemical abundance profiles for a variety of brown dwarf and extrasolar giant planet atmosphere models, focusing in particular on Gliese 229B, and derive the systematics of the changes in the dominant reservoirs of the major elements with altitude and temperature. We assume an Anders and Grevesse (1989) solar composition of 27 chemical elements and track 330 gas--phase species, including the monatomic forms of the elements, as well as about 120 condensates. We address the issue of the formation and composition of clouds in the cool atmospheres of substellar objects and explore the rain out and depletion of refractories. We conclude that the opacity of clouds of low--temperature ($\le$900 K), small--radius condensibles (specific chlorides and sulfides), may be responsible for the steep spectrum of Gliese 229B observed in the near infrared below 1 \mic. Furthermore, we assemble a temperature sequence of chemical transitions in substellar atmospheres that may be used to anchor and define a sequence of spectral types for substellar objects with T$_{eff}$s from $\sim$2200 K to $\sim$100 K.
One-Dimensional Modeling of Sedimentation Impacts for the Mississippi River at the West Bay Diversion  [PDF]
Jeremy A. Sharp, Ronald E. Heath, Nathan D. Clifton
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.59A002

The Coastal Wetlands Planning, Protection and Restoration Act (CWPPRA) funded construction of the West Bay Sediment Diversion Project (WBSD) on the west bank of the Mississippi River for the purpose of coastal restoration. A multi-tiered sediment study for the WBSD was conducted to determine impacts to the adjacent navigation channel and to the Pilottown Anchorage Area (PAA). One tier of the study is the implementation of HEC-6T, a one-dimensional (1-D) sediment model, to evaluate the regional impacts of the WBSD. The HEC-6T model results shows the long-term channel changes associated with the WBSD to be increasing shoaling in the adjacent areas on the order of 10% - 20%, as compared to the no WBSD condition. However, it is extremely difficult to isolate the impacts associated with a single diversion due to multiple diversions in the region. From a holistic vantage point, the 1-D model shows the necessity to examine, on a regional scale, the lower Mississippi River as a single congruent system on a regional scale.

LIF Measurement of the Diluting Effect of Surface Waves on Turbulent Buoyant Plumes  [PDF]
David B. Sharp, Alistair Shawcross, Clive A. Greated
Journal of Flow Control, Measurement & Visualization (JFCMV) , 2014, DOI: 10.4236/jfcmv.2014.23010
Abstract: In this paper, the diluting effect of surface waves on a buoyant plume has been measured using a Laser Induced Fluorescence (LIF) technique. The resulting time-averaged, full field concentration maps have allowed quantification of enhanced mixing due to surface waves as well as measurement of other plume parameters.
Partial Frequencies and Chladni’s Law in Church Bells  [PDF]
William A. Hibbert, David B. Sharp, Shahram Taherzadeh, Robert Perrin
Open Journal of Acoustics (OJA) , 2014, DOI: 10.4236/oja.2014.42007
Abstract: The rim partials of a church bell (those with an antinode at the soundbow) generate the strike pitch or perceived note of the bell. The spacing in frequency of the higher rim partials has an important effect on the tonal quality of the bell. Investigations into the partial frequencies of 2752 bells, both bronze and steel, of a wide variety of dates, founders and sizes, show a simple and unexpected relationship between the frequencies of the rim partials. This relationship explains why attempts to tune the higher rim partials independently have failed. A modified version of Chladni’s law provides insight into the musical relationship of the partials, and predicts the partials of individual bells well, but fails to give a simple model of the spacing between the partials seen in bells with different profiles.
Virtual Pitch and Pitch Shifts in Church Bells  [PDF]
William A. Hibbert, Shahram Taherzadeh, David B. Sharp
Open Journal of Acoustics (OJA) , 2017, DOI: 10.4236/oja.2017.73006
Abstract: It is well established that musical sounds comprising multiple partials with frequencies approximately in the ratio of small integers give rise to a strong sensation of pitch even if the lowest or fundamental partial is missing—the so-called virtual pitch effect. Experiments on thirty test subjects demonstrate that this virtual pitch is shifted significantly by changes in the spacing of the constituent partials. The experiments measured pitch by comparison of sounds of similar timbre and were automated so that they could be performed remotely across the Internet. Analysis of the test sounds used shows that the pitch shifts are not predicted by Terhardt’s classic model of virtual pitch. The test sounds used were modelled on the sounds of church bells, but a further experiment on seventeen test subjects showed that changes in partial amplitude only had a minor effect on the pitch shifts observed, and that a pitch shift was still observed when two of the lowest frequency partials were removed, so that the effects reported are of general interest.
Caffeine and Pressure Flow Autoregulation  [PDF]
Gary F. Merrill, Denisa M. Costea, Victoria A. Sharp
World Journal of Cardiovascular Diseases (WJCD) , 2019, DOI: 10.4236/wjcd.2019.94023
Abstract: The benefits or detriments of caffeine on the human cardiovascular system have not been thoroughly studied and are still poorly understood. In a world where caffeinated beverages are evidently the adult drug of choice (e.g. coffee, energy drinks, soda, tea),?investigating its effects on our bodies is of great importance. In this study,?we examined the effects of caffeine, taken as a tablet, on pressure-flow autoregulation. Young adults between 18 and 21 years of age were the experimental subjects. They were instrumented to monitor systemic arterial blood pressure, peripheral blood flow, calculated peripheral vascular resistance, and the electrocardiogram during an autoregulatory maneuver in the absence and presence of caffeine. Caffeine-mediated vasoconstriction was observed as early as 15 minutes after its consumption. Sixty minutes post-caffeine, vasoconstriction was so prominent that autoregulation was abolished. This was reflected, in part, as a significant reduction in blood flow that accompanied a 3-fold increase in calculated peripheral resistance and a significant increase in systemic arterial pressure. Heart rate was unaffected by caffeine under our experimental conditions. We conclude that caffeine has the ability to inhibit significant cardiovascular properties including pressure-flow autoregulation. Even though more work is needed, the significant caffeine-mediated changes in flow, pressure and resistance during autoregulation could have serious consequences for the cardiovascular system specifically, and for one’s overall health in general.
Craig Sharp,Craig A. Williams
Journal of Sports Science and Medicine , 2007,
Abstract: 20th ANNIVERSARY OF THE CHILDREN'S HEALTH AND EXERCISE CENTRE, UNIVERSITY OF EXETER, UK In recent years, partly because of the ever-younger exten-sion of high quality sport representation and partly, para-doxically, due to ever-increasing levels of obesity in the young, the discipline of paediatric physiology has moved from being an interesting curiosity to an extremely impor-tant area of practical knowledge. For example, children thermoregulate qualitatively and quantitatively differently from adults - before puberty their sweat rate per square metre of skin is less than half their adult level - and they may well have, proportionate to mass, 40% greater body surface area than an adult. On the musculo-skeletal side, they come late into 'kinetic-balance', into an appropriately economic mode of running or walking, so such effort is harder for them. In many other areas children, especially younger children, differ importantly from adults, and those involved in any aspects of their exercise, sport or medicine should be well aware of this. Hence the impor-tance of the discipline, and hence the reason for a very hearty celebration of the 20th anniversary of the Chil-dren's Health and Exercise Centre (CHERC), which, as is demonstrated here, has pioneered and expanded the entire discipline, as one of the world's leading paediatric labora-tories.To celebrate the 20th anniversary of the Children's Health and Exercise Centre (1987-2007) past and present mem-bers of the centre were invited to contribute a review article on paediatric exercise science. The collection of reviews, written by current and former PhD students, visiting research fellows and professors, visiting interns and current members of CHERC, discusses an array of topics, which have helped shaped the work of our centre. We would also like to take the opportunity to acknowl-edge all those associated with CHERC over the past 20 years, in particular the many children who have partici-pated in our research studies.
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