Current Parameters (current + parameter)

Distribution by Scientific Domains

Selected Abstracts

Effects of Parasite Attributes and Injected Current Parameters on Electromagnetic Detection of Parasites in Fish Muscle

G.S. Choudhury
ABSTRACT: We examined the potential of an electromagnetic parasite detection technique to become the basis of an automated commercial system. The effects of parasite orientation and position, presence offish bone, and applied signal strength and frequency on resultant magnetic field strength were determined by scanning a conducting cell containing fish fillet and parasite below a SQUID magnetometer. The parasite orientation affected peak-to-peak voltage of the magnetic dipole. The parasite position with respect to myotome structure seemed to affect the orientation of the dipolar signal. A fish bone was readily detected. The magnetic field strength was independent of the frequency of the injected current and scaled with amplitude=. [source]

Brief alcohol intervention,where to from here?

ADDICTION, Issue 6 2010
Challenges remain for research, practice
ABSTRACT Brief intervention (BI) is intended as an early intervention for non-treatment-seeking, non-alcohol-dependent, hazardous and harmful drinkers. This text provides a brief summary of key BI research findings from the last three decades and discusses a number of knowledge gaps that need to be addressed. Five areas are described: patient intervention efficacy and effectiveness; barriers to BI implementation by health professionals; individual-level factors that impact on BI implementation; organization-level factors that impact on BI implementation; and society-level factors that impact on BI implementation. BI research has focused largely upon the individual patient and health professional levels, with the main focus upon primary health care research, and studies are lacking in other settings. However, research must, to a larger degree, take into account the organizational and wider context in which BI occurs, as well as interaction between factors at different levels, in order to advance the understanding of how wider implementation of BI can be achieved in various settings and how different population groups can be reached. It is also important to expand BI research beyond its current parameters to investigate more ambitious long-term educational programmes and new organizational models. More widespread implementation of BI will require many different interventions (efforts, actions, initiatives, etc.) at different interlinked levels, from implementation interventions targeting individual health professionals' knowledge, skills, attitudes and behaviours concerning alcohol issues, BI and behaviour change counselling to efforts at the organizational and societal levels that influence the conditions for delivering BI as part of routine health care. [source]

Some Parameters of Correlated Current and Radiated Field Pulses from Lightning to the Gaisberg Tower

Hannes Pichler Non-member
Abstract Simultaneous measurements of lightning current and associated radiated electromagnetic field are of fundamental interest for various applications in lightning research. These data can be used for the evaluation of return stroke (RS) models or to investigate the so-called tower effect when lightning hits an elevated object. In this paper, we show the results of simultaneous measurements of current pulses from lightning strikes on the instrumented Gaisberg tower (Austria) and the correlated vertical E-field components at a distance of 78.8 and 108.7 km, respectively. We have analyzed some main lightning current parameters (peak current Ip, 30,90% rise time TI_30-90, and full width at half maximum TI_FWHM and the time-correlated field waveform parameters (Ep, 30,90% rise time TE_30-90, TE_FWHM, and the peak-to-zero time TE_PTZ. With a geometric mean of TI_FWHM = 19 ,s and Ip = 9.6 kA (N = 73) of the RS current pulses used in this study, those strokes are very similar to the strokes in triggered lightning in Florida and Alabama1. With a TE_PTZ of about 10 s, the zero-crossing time of the radiated E-fields from the tower strokes are significantly shorter than the typical values of 30 , 40 s (e.g.2). Correlation between the current and field parameters TI_FWHM versus TE_FWHM and TE_PTZ, respectively, is low (R2 = 0.29 and 0.14). We assume that the relatively short lightning channel in the case of the RSs in object-triggered upward flashes is the main reason for the observed short zero-crossing time. Copyright 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. [source]

Development of polyphosphate parameters for use with the AMBER force field

Kristin L. Meagher
Abstract Accurate force fields are essential for reproducing the conformational and dynamic behavior of condensed-phase systems. The popular AMBER force field has parameters for monophosphates, but they do not extend well to polyphorylated molecules such as ADP and ATP. This work presents parameters for the partial charges, atom types, bond angles, and torsions in simple polyphosphorylated compounds. The parameters are based on molecular orbital calculations of methyldiphosphate and methyltriphosphate at the RHF/6-31+G* level. The new parameters were fit to the entire potential energy surface (not just minima) with an RMSD of 0.62 kcal/mol. This is exceptional agreement and a significant improvement over the current parameters that produce a potential surface with an RMSD of 7.8 kcal/mol to that of the ab initio calculations. Testing has shown that the parameters are transferable and capable of reproducing the gas-phase conformations of inorganic diphosphate and triphosphate. Also, the parameters are an improvement over existing parameters in the condensed phase as shown by minimizations of ATP bound in several proteins. These parameters are intended for use with the existing AMBER 94/99 force field, and they will permit users to apply AMBER to a wider variety of important enzymatic systems. 2003 Wiley Periodicals, Inc. J Comput Chem 24: 1016,1025, 2003 [source]