Experimental Confirmation (experimental + confirmation)

Distribution by Scientific Domains


Selected Abstracts


THURSTONIAN MODELS AND VARIANCE II: EXPERIMENTAL CONFIRMATION OF THE EFFECTS OF VARIANCE ON THURSTONIAN MODELS OF SCALING

JOURNAL OF SENSORY STUDIES, Issue 5 2006
HEE-JIN KIM
ABSTRACT Subjects rated taste intensities using category scales under a variety of experimental protocols, which induced differences in computed values of d,. These were explained in a Thurstonian/signal detection context, by variation in the effects of adaptation changing perceived intensities (perceptual variance), by the effects of forgetting (memory variance) and by differences in the idiosyncratic ways that subjects use category-rating scales (boundary variance). [source]


Experimental Confirmation of the Low-Temperature Oxidation Scheme of Alkanes,

ANGEWANDTE CHEMIE, Issue 18 2010
Frédérique Battin-Leclerc Dr.
Vermutung bestätigt: Die Entwicklung von Verbrennungsmotoren beruht auf dem Wissen um den Mechanismus der Selbstzündung von Kohlenwasserstoffen. Eine grundsätzliche Annahme konnte nun experimentell bestätigt werden: Die Bildung von Ketohydroperoxiden wurde unter Bedingungen beobachtet, die denjenigen vor der Selbstzündung nahekommen. [source]


Interactions between arbuscular mycorrhizal fungi and bacteria and their potential for stimulating plant growth

ENVIRONMENTAL MICROBIOLOGY, Issue 1 2006
Veronica Artursson
Summary Arbuscular mycorrhizal (AM) fungi and bacteria can interact synergistically to stimulate plant growth through a range of mechanisms that include improved nutrient acquisition and inhibition of fungal plant pathogens. These interactions may be of crucial importance within sustainable, low-input agricultural cropping systems that rely on biological processes rather than agrochemicals to maintain soil fertility and plant health. Although there are many studies concerning interactions between AM fungi and bacteria, the underlying mechanisms behind these associations are in general not very well understood, and their functional properties still require further experimental confirmation. Future mycorrhizal research should therefore strive towards an improved understanding of the functional mechanisms behind such microbial interactions, so that optimized combinations of microorganisms can be applied as effective inoculants within sustainable crop production systems. In this context, the present article seeks to review and discuss the current knowledge concerning interactions between AM fungi and plant growth-promoting rhizobacteria, the physical interactions between AM fungi and bacteria, enhancement of phosphorus and nitrogen bioavailability through such interactions, and finally the associations between AM fungi and their bacterial endosymbionts. Overall, this review summarizes what is known to date within the present field, and attempts to identify promising lines of future research. [source]


Matching network design using non-Foster impedances

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 2 2006
*Article first published online: 8 FEB 200, Stephen E. Sussman-Fort
Abstract Non-Foster synthesis bypasses the gain-bandwidth limitations of conventional LC matching and achieves superior broadband performance by employing negative circuit elements, which are realized via negative impedance converters. The idea is to construct a negative-image model of an antenna, which cancels the antenna's parasitic reactance and transforms its frequency-dependent radiation resistance to a constant value. Successful implementation of negative-image modeling requires the realization of stable, low-loss negative elements. After a discussion of the basic ideas of non-Foster matching, we present experimental results for broadband, stable, high- Q, grounded negative capacitance. Next, in the first experimental confirmation of non-Foster impedance matching for signal reception, we use a floating negative capacitor to cancel a substantial portion of the reactance of a 6-in. monopole antenna. Over 20,110 MHz, the signal-to-noise ratio improved by up to 6 dB as compared to the same antenna with no matching, or to a lossy-matched blade antenna of twice the size. © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2006. [source]


Effects of correlated disorder on the magneto-transport in colossal magnetoresistance manganites

PHYSICA STATUS SOLIDI - RAPID RESEARCH LETTERS, Issue 4 2009
M. Egilmez
Abstract Monte-Carlo simulations predict that a local correlated disorder is responsible for many of the novel transport and magnetic properties of colossal magnetoresistance (CMR) materials such as manganites. One important prediction of these models is that the resistivity at the metal,insulator transition (MIT) in manganites depends strongly on the correlated quenched disorder. However, experimental confirmation has been challenging since it is difficult to control the amount of disorder in these compounds. We carried out experiments on Sm0.55Sr0.45MnO3, a prototypical CMR manganite with a sharp MIT, whereby the oxygen-related disorder is systematically enhanced by low temperature thermal activation. We observe dramatic changes in the temperature dependence of resistivity at the MIT as the amount of quenched disorder is increased, occurring in a manner that is in agreement with theoretical predictions. Temperature dependence of resistivity of Sm0.55Sr0.45MnO3 for different annealing times at 350 °C in vacuum. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]