نتایج جستجو برای: deflation test
تعداد نتایج: 813997 فیلتر نتایج به سال:
Intra-Aortic Balloon Pump Counter-Pulsation To the Editor: The imaging of coronary flow1 during intra-aortic balloon pumping is important and might be used to adjust the timing of balloon deflation better. In the series of figures shown by Ryan and Foster,1 with intra-aortic balloon pumping assisting every second beat, there was no consistent reduction of systolic pressure in the intervening un...
We present the results of an empirical study of the performance of the QR algorithm (with and without shifts) and the Toda algorithm on random symmetric matrices. The random matrices are chosen from six ensembles, four of which lie in the Wigner class. For all three algorithms, we observe a form of universality for the deflation time statistics for random matrices within the Wigner class. For t...
To test the hypothesis that spontaneous changes in cerebral blood flow are primarily induced by changes in arterial pressure and that cerebral autoregulation is a frequency-dependent phenomenon, we measured mean arterial pressure in the finger and mean blood flow velocity in the middle cerebral artery (V˙MCA) during supine rest and acute hypotension induced by thigh cuff deflation in 10 healthy...
Cyclic elevation of intrathoracic pressure can close the mitral valve during cardiac arrest in dogs.
Mitral valve closure during cardiopulmonary resuscitation may result from direct cardiac compression. An alternative hypothesis is that with a rise in intrathoracic pressure, mitral valve closure can occur but may be influenced by whether the lungs are inflated or deflated. To test this hypothesis, we placed a large-bore cannula into the thoraces of 11 dogs. Intrathoracic pressure was changed b...
Given an approximation to a multiple isolated solution of a polynomial system of equations, we have provided a symbolic-numeric deflation algorithm to restore the quadratic convergence of Newton’s method. Using first-order derivatives of the polynomials in the system, our method creates an augmented system of equations which has the multiple isolated solution of the original system as a regular...
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