4,116 research outputs found
Testing the application of post IR IRSL dating to Iron- and Viking-age ceramics and heated stones from Denmark
Transverse Momentum Spectra in Au+Au and d+Au Collisions at =200 GeV and the Pseudorapidity Dependence of High p Suppression
We present spectra of charged hadrons from Au+Au and d+Au collisions at
GeV measured with the BRAHMS experiment at RHIC. The
spectra for different collision centralities are compared to spectra from collisions at the same energy scaled by the number of binary
collisions. The resulting ratios (nuclear modification factors) for central
Au+Au collisions at and evidence a strong suppression in
the high region (2 GeV/c). In contrast, the d+Au nuclear
modification factor (at ) exhibits an enhancement of the high
yields. These measurements indicate a high energy loss of the high
particles in the medium created in the central Au+Au collisions. The lack of
suppression in d+Au collisions makes it unlikely that initial state effects can
explain the suppression in the central Au+Au collisions.Comment: 4 pages, 4 figures, submitted to Phys. Rev. Let
Rapidity Dependence of Charged Antiparticle-to-Particle Ratios in Au+Au Collisions at GeV
We present ratios of the numbers of charged antiparticles to particles
(pions, kaons and protons) in Au + Au collisions at GeV as
a function of rapidity in the range =0-3. While the particle ratios at
midrapidity are approaching unity, the and ratios
decrease significantly at forward rapidities. An interpretation of the results
within the statistical model indicates a reduction of the baryon chemical
potential from MeV at =3 to MeV at
=0.Comment: 4 pages, 4 figure
Nonionic surfactants increase digoxin absorption in Caco-2 and MDCKII MDR1 cells: Impact on P-glycoprotein inhibition, barrier function, and repeated cellular exposure
Nonionic surfactants modulate the transport activity of ATP-binding cassette (ABC) transporters and solute carriers (SLC):Relevance to oral drug absorption
Reappearance of <em>Taenia ovis krabbei</em> muscle cysts in a roe deer (<em>Capreolus capreolus</em>) in Denmark after 60+ years, with a possible role of a grey wolf (<em>Canis lupus</em>) as definitive host
Fake people, real effects : the presence of virtual onlookers can impair performance and learning
Can effects of social influence be elicited in virtual contexts, and if so, under which conditions can they be observed? Answering these questions has theoretical merit, as the answers can help broaden our understanding of the interaction mechanisms described by social psychology. The increasing popularity of immersive media in training applications, however, has made these questions of practical significance. Virtual reality (VR), in particular, is a weapon of choice in designing training and education simulations, as it can be used to generate highly realistic characters and environments. As a consequence, it is key to understand under which circumstances virtual âothersâ can facilitate or impede performance and â especially â learning. In this study, we investigated the impact of virtual onlookers on an adapted Serial Reaction Time (SRT) task that was presented in VR. In each trial, participants responded to a series of spherical stimuli by tapping them with handheld controllers when they lit up. Depending on the experiment block, the sequence order was either the permutation of a fixed order (and therefore predictable given the first stimulus), or fully random (and therefore unpredictable). Participants were divided into three groups (audience variable), depending on the environment in which the task was set: a group without onlookers (none condition), a group with a computer-generated audience (CGI condition), and a group being watched by a prerecorded audience (filmed condition). Results showed that the presence of a virtual audience can hamper both overall performance and learning, particularly when the audience appears more realistic. This study further reinforces the notion that the effects of social influence transcend the physical presence of others, but rather extend to virtual audiences
High-dose etoposide formulations do not saturate intestinal P-glycoprotein:Development, stability, and pharmacokinetics in Sprague-Dawley rats
Quantitative planar and volumetric cardiac measurements using 64 mdct and 3t mri vs. Standard 2d and m-mode echocardiography: does anesthetic protocol matter?
Crossâsectional imaging of the heart utilizing computed tomography and magnetic resonance imaging (MRI) has been shown to be superior for the evaluation of cardiac morphology and systolic function in humans compared to echocardiography. The purpose of this prospective study was to test the effects of two different anesthetic protocols on cardiac measurements in 10 healthy beagle dogs using 64âmultidetector row computed tomographic angiography (64âMDCTA), 3T magnetic resonance (MRI) and standard awake echocardiography. Both anesthetic protocols used propofol for induction and isoflourane for anesthetic maintenance. In addition, protocol A used midazolam/fentanyl and protocol B used dexmedetomedine as premedication and constant rate infusion during the procedure. Significant elevations in systolic and mean blood pressure were present when using protocol B. There was overall good agreement between the variables of cardiac size and systolic function generated from the MDCTA and MRI exams and no significant difference was found when comparing the variables acquired using either anesthetic protocol within each modality. Systolic function variables generated using 64âMDCTA and 3T MRI were only able to predict the left ventricular end diastolic volume as measured during awake echocardiogram when using protocol B and 64âMDCTA. For all other systolic function variables, prediction of awake echocardiographic results was not possible (P = 1). Planar variables acquired using MDCTA or MRI did not allow prediction of the corresponding measurements generated using echocardiography in the awake patients (P = 1). Future studies are needed to validate this approach in a more varied population and clinically affected dogs
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