Introduction: High-performance MRI systems demand the use of digitally controlled switching gradient amplifiers (SGAs) that need complex electronic circuits and control algorithms to achieve not only good image quality but also good power efficiency [1-2]. Moreover, the imaging capabilities of clinical MRI system may be improved by the use of gradient insert coils that achieve gradient amplitud...

Advances in solid-state photon detectors paved the way to combine positron emission tomography (PET) and magnetic resonance imaging (MRI) into highly integrated, truly simultaneous, hybrid imaging systems. Based on the most recent digital SiPM technology, we developed an MRI-compatible PET detector stack, intended as a building block for next generation simultaneous PET/MRI systems. Our detecto...

The electrokinetic remediation (EKR) method has been extensively considered for the removal of inorganic pollutants from contaminated dredged sediment. In addition, use chelating agents as electrolyte solutions beneficial in increasing mobility metals. This study investigated metals’ (Cd, Cr, Cu, Pb, and Zn) mobilities by assessing effect two environmentally friendly agents, ethylenediaminedisu...

Ion channels constitute a superfamily of membrane proteins found in all living creatures. Their activity allows fast translocation of ions across the plasma membrane down the ion's transmembrane electrochemical gradient, resulting in a difference in electrical potential across the plasma membrane, known as the membrane potential. A group within this superfamily, namely voltage-gated channels, d...

OBJECTIVES This study sought to assess the effect of passive "bystander" epicardial electrodes on defibrillation efficacy. BACKGROUND We hypothesized that an inactive epicardial patch placed in an area of low potential gradient from an endocardial electrode shock might affect defibrillation efficacy through its effects on the shock field and the underlying potential gradient. METHODS We stu...

In the field of failure analysis of integrated circuits, diagnosing functional failures is a requirement. Traditional beam-based analysis techniques use a scanning laser or ebeam to induce a parametric shift, which is monitored through changes in current or voltage driven to the device. Deep submicron technologies frustrate these analytical methods due to the nearly immeasurable parametric shif...

Recently HZB proposed an upgrade of the 3 generation synchrotron light source BESSY II allowing simultaneous long and short pulse operation [1]. For this scheme superconducting higher harmonic cavities of the fundamental 500MHz at two frequencies need to be installed in the BESSY II storage ring. Given an appropriate choice of the higher harmonics the resulting gradient leads to a beating effec...

published online Dec 21, 2006; J. Physiol. Almog, Hana Ben-Porat, Bert Sakmann and Alon Korngreen Andreas T Schaefer, Moritz Helmstaedter, Arno C Schmitt, Dan Bar-Yehuda, Mara neocortical layer 5B Dendritic voltage-gated K+ conductance gradient in pyramidal neurones of Physiology in Press This information is current as of September 18, 2007 http://jp.physoc.org/cgi/content/abstract/jphysiol.200...

Laboratory and in situ velocity measurements have been made on six piston cores taken in the western North Atlantic Ocean. Sediments from the southwestern Bermuda Rise and Greater Antilles Outer Ridge are clays having velocities ranging mostly from 1500 to 1530 m/s and velocity gradients near 1 s -•. In cores from the Nares Abyssal Plain, the clayey sediments have comparable velocities, but int...

In this paper, a locational marginal pricing algorithm is proposed to control the voltage in unbalanced distribution grids. The increasing amount of photovoltaic (PV) generation installed in the grid may cause the voltage to rise to unacceptable levels during periods of low consumption. With locational prices, the distribution system operator can steer the reactive power consumption and active ...