06 05 49 3 v 1 19 M ay 2 00 6 A New Mechanism for Gravitational Wave Emission in Core-Collapse Supernovae
Christian D. Ott, Adam Burrows, Luc Dessart, Eli Livne Max-Planck-Institut für Gravitationsphysik, Albert-Einstein-Institut, Potsdam, Germany; cott@aei.mpg.de Department of Astronomy and Steward Observatory, The University of Arizona, Tucson, AZ 85721; burrows@zenith.as.arizona.edu,luc@as.arizona.edu and Racah Institute of Physics, The Hebrew University, Jerusalem, Israel; eli@frodo.fiz.huji.ac.il
PROCEEDINGS OF THE Britbsh Pharmacoloqical The antihypertensive properties and effects on urate and electrolyte excretion of tienilic acid, bendrofluazide and spironolactone Influence of coronary artery occlusion on tthe myocardial distribution of digoxin
Speculation continues as to whether or not digoxin enhances the risk of ventricular dysrhythmias during acute myocardial infarction (Lown, Klein, Barr, Hagemeyer, Kosowsky & Garrison, 1972). Any heterogeneous distribution of digoxin might increase the arrhythmogenic potential of the ischaemic myocardium. Two aspects of the relationship between ischaemia of the myocardium and myocardial digoxin concentrations were therefore studied in 28 open-chest dogs with anterior wall infarction; firstly myocardial digoxin uptake and secondly, but more importantly, the rate and duration of the 'washout' of the drug from the myocardium. The uptake of 1251 labelled digoxin by the ischaemic myocardium, although directly proportional to regional myocardial blood flow (RMBF), was less severely depressed than was RMBF. As 'washout' times during continuing coronary occlusion were prolonged for up to 12 h, the concentrations of 1251 labelled digoxin in the ischaemic myocardium became steadily higher relative to those in the normal myocardium and reaching up to 208% of the normal. In addition, the more ischaemic the myocardium, the slower was the 'washout'. Thus, in acute myocardial infarction the distribution of digoxin throughout the myocardium is markedly heterogeneous and the effects of continued administration of the drug merit further study.
Actuating Principle of Online Automatic Balancer with Counter Weight Driven by Magnetic Force
Kinematic precept of mass block in automatic balancer is proposed following the principle of online automatic dynamic balancing.By combination of electromagnet and permanent magnet,the magnetic circuit of the balancer with ring coil and rare earth permanent magnet is designed.Actuating process of the balancer is discussed and then a step drive voltage waveform is defined.For the high-speed grinding motorized spindle 170MD12Y16,the mechanical structure and dimensions of the balancer are schemed out.The electromagnetic simulations for the designed balancer are conducted and the better coil ampere-turns and reluctance adjusting ring thickness are then determined.The validity of simulation results is verified by a balancer driving experiment and the desired voltage value and its duration time are also determined.the designed balancer has a stable operation process without out-of-step and fluctuation around balanced position when the ampere-turns are considered as 1 kA,the reluctance adjusting ring thickness 0.2 mm,the driving voltage 12.4 V and the voltage duration time 120 ms.