This paper presents “surfing,” a novel variation of wave pipelining. In previous wave pipelined designs, timing uncertainty grows monotonically as data propagates through gates and other logic elements. Our designs propagate a timing pulse along with the data values, and our logic elements have delays that decrease in the presence of the pulse. This produces a “surfing” effect wherein events ar...

BACKGROUND AND PURPOSE Arterial stiffening reduces damping of the arterial waveform and hence increases pulsatility of cerebral blood flow, potentially damaging small vessels. In the absence of previous studies in patients with recent transient ischemic attack or stroke, we determined the associations between leukoaraiosis and aortic and middle cerebral artery stiffness and pulsatility. METHO...

We specifically developed a diode-pumped, Q-switched Nd:YAG laser to act as a pump source for a terahertz-wave parametric generator. A single Q-switched laser pulse ~pulse width 12 ns, pulse repetition frequency 40 Hz! produced an output energy of 12 mJ. Utilizing this pump source, we were able to construct a compact ~6503350 mm! terahertz-wave parametric generator using LiNbO3 crystals. We ach...

We report results on chemical wave propagation obtained from experiments with a modified Belousov–Zhabotinsky reaction. Under pseudo-onedimensional reaction conditions, excitation pulses either form closely stacked, stable wavepackets or merge with a slow leading pulse in front-to-back collisions. Moreover, wave stacking can involve the cascading formation of metastable clusters. These phenomen...

Information that can be derived from an assessment of the jugular venous pulse includes determination of the mean venous pressure, venous pulse contour, and presence and type of cardiac dysrhythmias . The jugular venous pressure is usually assessed by observing the right side of the patient's neck. The normal mean jugular venous pressure, determined as the vertical distance above the midpoint o...

With the technical assistance of William Urban Previous studies have shown abnormalities of the arterial pulse wave in hypertensive subjects of all age groups. The major change has been diminution to disappearance of the dicrotic wave. The pharmacologic differences between epinephrine and norepi-nephrine offer a means of studying the mechanism of this change in the dicrotic wave. In the present...

In this paper, a kind of impulse radio (IR) 60 GHz pulse based on Prolate Spheroidal Wave Functions (PSWF) is proposed. The capacity and performance for multiple access 60 GHz communication system based on carrier pulse and impulse radio pulse are analyzed separately. Both frequency-shifted Gaussian pulse and Prolate Spheroidal Wave Functions (PSWF) pulse are considered and devised according to...

Arterial stiffness is an independent predictor of mortality and is regulated by a number of factors, including vascular smooth muscle tone. However, the relationship between endothelial function and definitive measures of arterial stiffness and wave reflections has not been described in healthy individuals. Therefore, we tested the hypothesis that endothelial function is inversely correlated wi...

The indirect arterial pulse tracing from a healthy young person normally shows two systolic waves, the percussion wave and the tidal wave (Fig. 1). In hypertension and old age the percussion wave is usually small or absent (Fig. 2). In health, anwmia, and hyperthyroidism (Hancock and Abelmann, 1957), and in patent ductus arteriosus (Fig. 3), the two peaks may be prominent enough to give the pul...

Pulsatile intracranial pressure (ICP) is a key to the understanding of several neurological disorders in which compliance is altered, e.g., hydrocephalus. A recently proposed model suggests that ICP pulse is a standing wave and not a transmitted wave. The present work, aimed at obtaining a better understanding of the pulsatility in the cranium, tries to test the following hypotheses: first, ICP...