Search results for "Toe"
showing 10 items of 3824 documents
Practical design rules for single-channel ultra high-speed dense dispersion management telecommunication systems
2009
International audience; In this work, we establish some efficient and practical design rules for the implementation of single-channel ultra-high speed (>160-Gbit/s) telecommunication systems based on dense dispersion management. Moreover, we analyze some of actual implementation issues such as slope compensation scenario, junction losses, polarization mode dispersion and chromatic dispersion fluctuations.
Phytoestrogens increase the capacity of serum to stimulate prostacyclin release in human endothelial cells
2003
Both the estrogen receptor (ER) alpha and beta isoforms are expressed in the endothelium. The ER beta has been assigned a crucial role in normal vascular wall function. Prostacyclin has been ascribed a beneficial effect on vessel wall physiology. Isoflavones bind with higher affinity to ER beta. We investigated the hypothesis that their administration to postmenopausal women can promote endothelial prostacyclin production.Twenty-five healthy postmenopausal women with mild climacteric symptoms received capsules containing 55 mg/day isoflavones derived from soy and red clover for 6 months. Cultured human umbilical vein endothelial cells (HUVECs) were exposed for 24 h to serum collected before…
The Philosophical Underpinning of Athlete Lifestyle Support : An Existential-Humanistic Perspective
2022
This study aims to highlight how an existential-humanistic perspective can inform athlete support and in doing so, emphasise the importance of explicating the philosophical underpinnings of athlete lifestyle support. Drawing on applied experience with elite youth cricketers over a twelve-month period, ethnographic data was collected through the observation, maintenance of case notes and a practitioner reflective diary. Based on thematic analysis (Braun & Clarke, 2006), we created three non-fictional vignettes that we use to illustrate how existential-humanistic theorising can inform lifestyle support. We discuss the implications of this professional philosophy in terms of considerations for…
Self-efficacy in AIDS sexual prevention: influence of gender
2013
La literatura científica apunta a que la escasa autoeficacia para el uso del preservativo explicaría muchas conductas de riesgo de transmisión del VIH en jóvenes. Se analiza la autoeficacia de los jóvenes en el uso del preservativo, la existencia de diferencias de género y la relación con variables relevantes en la prevención. Se aplicó la "Subescala de Autoeficacia en el Uso del Preservativo", incluida en el Cuestionario de Prevención del Sida (Ballester, Gil y Giménez, 2007), a 3540 universitarios (50.9% mujeres, 49.1% hombres). Los resultados indican que los jóvenes obtienen puntuaciones medias-altas en autoeficacia, mostrándose la menor puntuación en el autocontrol en el momento de exci…
Autoeficacia en la prevención sexual del Sida: la influencia del género
2013
Title: Self-efficacy in AIDS sexual prevention: influence of gender. Abstract: The scientific literature suggests that a low self-efficacy for con- dom use may be related to many risky behaviors for HIV transmission in young people. We analyze the self-efficacy of condom use among youth, the existence of gender differences and the relationship with other relevant variables in HIV prevention. The "Self-Efficacy Condom Use Subscale", included in the AIDS Prevention Questionnaire (Ballester, Gil and Gimenez, 2007), was administrated to 3540 university students (50.9% women, 49.1% men). The results showed that the sample obtained medi- um-high scores on self-efficacy, showing the lowest scores …
The effect of Mo and Ge reactive elements on high-temperature oxidation of higher manganese silicide
2021
Abstract Higher manganese silicide (HMS) alloys (Mnx-αMoαSiy-βGeβ (x = 0.99–1.011, α = 0.005–0.02, y = 1.75, β = 0.005–0.01)) were studied to elucidate the effect of Mo and Ge pertaining to oxidation. Oxidation experiments were conducted using thermogravimetry and characterized using x-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Isoconversion experiments below 450 °C, shows that doping (up to 2 at%) raises the oxidation potential of HMS. Isothermally, the oxidation rate reduces buy one order of magnitude by doping on Mn and/or Si sites from 0.5 to 2 at%, revealing that the dopants-based oxides do not lessen the robustness of SiO2 oxide.
Nanofilm metal layers as vacuum quality sensors
2010
Abstract A monitoring device for vacuum quality is realized by lowest cost single use oxygen sensors for vacuum insulation panels. They use the pressure dependence of oxide layer growth thickness on electrically measured metal nanofilms. These films were manufactured by e-beam evaporation, characterized in terms of resistance change with subsequent modeling of underlying mechanisms.
Chemical effect on the XPS spectra of the valence band and on O KLL and Pd MNN Auger spectra in pumice-supported catalysts
1992
X-ray photoelectron spectra of the valence band and X-ray-excited O KLL Auger transition of pumice-supported Pd and Pt catalysts have been obtained and compared to the corresponding spectra of pumice (a naturally occurring amorphous aluminosilicate). The changes observed indicate interaction between metal and support. The valence region of the catalysts consists of three large peaks: one due to the d band of the metals and the other to the O 2p non-bonding orbitals and bonding-type orbitals formed by a mixing of the atomic orbitals (O 2p, Si 3s and Si 3p) of oxygen and silicon from the support. The intensity decrease of the component due to the bonding orbitals, observed in the catalyst spe…
Valence electronic structure of C60: Theoretical analysis of photoemission data
1993
Abstract We present a theoretical investigation of the valence band photoemission spectra of C 60 using the nonempirical valence effective Hamiltonian (VEH) method. The VEH-DOVS curves calculated for the C 60 molecule are found to be in excellent agreement with synchrotron-radiation photoemission spectra reported for C 60 films. A detailed interpretation of all the photoemission bands is performed in the light of the VEH results.
Spin-resolved low-energy and hard x-ray photoelectron spectroscopy of off-stoichiometric Co2MnSi Heusler thin films exhibiting a record TMR
2015
Half-metallic Co2MnSi-based Heusler compounds have attracted attention because they yield very high tunnelling magnetoresistance (TMR) ratios. Record TMR ratios of 1995% (at 4.2 K) are obtained from off-stoichiometric Co2MnSi-based magnetic tunnel junctions. This work reports on a combination of band structure calculations and spin-resolved and photon-polarisation-dependent photoelectron spectroscopy for off-stoichiometric Heusler thin films with the composition Co2Mn1.30Si0.84. Co and Mn are probed by magnetic dichroism in angle-resolved photoelectron spectroscopy at the 2p core level. In contrast to the delocalised Co 3d states, a pronounced localisation of the Mn 3d states is deduced fro…