5,894 research outputs found
Search for Compensated Isocurvature Perturbations with Planck Power Spectra
In the standard inflationary scenario, primordial perturbations are
adiabatic. The amplitudes of most types of isocurvature perturbations are
generally constrained by current data to be small. If, however, there is a
baryon-density perturbation that is compensated by a dark-matter perturbation
in such a way that the total matter density is unperturbed, then this
compensated isocurvature perturbation (CIP) has no observable consequence in
the cosmic microwave background (CMB) at linear order in the CIP amplitude.
Here we search for the effects of CIPs on CMB power spectra to quadratic order
in the CIP amplitude. An analysis of the Planck temperature data leads to an
upper bound , at the 68\% confidence
level, to the variance of the CIP amplitude. This is then
strengthened to if Planck
small-angle polarization data are included. A cosmic-variance-limited CMB
experiment could improve the sensitivity to CIPs to . It is also found that adding CIPs to the
standard CDM model can improve the fit of the observed smoothing of
CMB acoustic peaks just as much as adding a non-standard lensing amplitude.Comment: 9 Pages, 3 Tables, 6 Figures. Accepted in PR
A Hidden Hole in the Fifth Amendment: Treaty Power Versus Property Rights: A Substitute for the Bricker Amendment
EFFECT OF VERBAL AND VISUAL FEEDBACK ON PEAK TORQUE DURING A KNEE JOINT ISOKINETIC TEST
The purpose of this study was to assess the effect of verbal and visual feedback on peak torque in male subjects. Thirty male subjects were tested on four separate occasions by executing a knee flexion/extension isokinetic set of four maximal repetitions, at velocities of 60, 120, 180, 240 and 300 deg/sec with a 60 second rest between each velocity set. The velocity order was randomized and visual and verbal feedback to subjects was randomly assigned. A 2 X 5 repeated measures ANOVA was used to analyze the data with α < 0.05. There were no significant differences in peak torque regardless of the presence or absence of feedback. The conclusion of this study was that feedback does not increase peak torque during concentric isokinetic testing
Antioxidant Activity of Extract From Ultrasonic-Assisted Extraction of Durian Peels
The increase in durian production results in the accumulation of durian peel waste. The bioactive component of durian peel has the potential to be used as an antioxidant. Thus, there is a need to carry out an extraction process to obtain bioactive compounds from durian peel. However, conventional extraction methods cause damage to phenolic compounds due to oxidation, hydrolysis and ionization reactions during the extraction process. Therefore, durian peel extraction was carried out using ultrasonic assisted extraction method (UAE) in this study. The purpose of this study was to investigate the effect of varying ratios of durian peel to ethanol solvents and extraction time on the yield, total phenolics content, total flavonoids content and antioxidant activity. The results of the research data were analyzed using a two-factor completely randomized design, which included variations of the ratio of durian peel to ethanol solvents and extraction time The Duncan's New Multiple Range Test (DNMRT) was carried out as a follow up test to determine the differences in each treatment at a significance level of 0.05. The results showed that the best treatment for peel extraction using ultrasonic assisted extraction was a 1: 9 ratio of durian peel to ethanol at an extraction time of 20 minutes. The extraction of durian peel under this condition gave the highest yield of 12.77 ± 0.16%, antioxidant activity (IC50) of 38.33 ± 0.12 ppm, total phenolic content of 63.30 ± 0.08 mgGAE / g and total flavonoids content of 47.53 ± 0.48 mgQE / g. In addition, total phenolics content and total flavonoid content showed a strong correlation to the antioxidant activity of durian peel extract
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