This letter is intended to extend the discussion of Bellamy's (1978) intriguing analysis of diastolic coronary artery pressure-flow relations in dogs during long diastoles. In reactive hyperemia (RH), he found practically linear diastolic pressure-flow relations. These linear pressure-flow relations led him to the conclusion that coronary resistance, R, remains constant during diastole, and con...

Methods The retinal vessel system is divided in four quadrants, each with five parts of vessels, which consist of parallel connected vessels with similar physiological relations in each case. By means of nonlinear flow pressure relations you can verify in separate vessels bloodflow, velocity of blood, decrease of pressure and flow resistance. Values founded by measurement technique are used as ...

Methods The retinal vessel system is divided in four quadrants, each with five parts of vessels, which consist of parallel connected vessels with similar physiological relations in each case. By means of nonlinear flow pressure relations you can verify in separate vessels bloodflow, velocity of blood, decrease of pressure and flow resistance. Values founded by measurement technique are used as ...

Methods The retinal vessel system is divided in four quadrants, each with five parts of vessels, which consist of parallel connected vessels with similar physiological relations in each case. By means of nonlinear flow pressure relations you can verify in separate vessels bloodflow, velocity of blood, decrease of pressure and flow resistance. Values founded by measurement technique are used as ...

Methods The retinal vessel system is divided in four quadrants, each with five parts of vessels, which consist of parallel connected vessels with similar physiological relations in each case. By means of nonlinear flow pressure relations you can verify in separate vessels bloodflow, velocity of blood, decrease of pressure and flow resistance. Values founded by measurement technique are used as ...

The problem of distributing gas through a network of pipelines is formulated as a cost minimization subject to nonlinear flow-pressure relations, material balances and pressure bounds. The solution method is based on piecewise linear approximations of the nonlinear flowpressure relations. The approximated problem is solved by an extension of the Simplex method. The solution method is tested on ...

Background: With respect to physical relations in force and pressure, we hypothesized that the prevalence of traumatic tympanic membrane perforation in patients with a patulous Eustachian tube is greater than normal, because in Eustachian tube patency, the internal air pressure of the middle ear will not increase after compression, subsequent to trauma. Therefore the force upon the tympanic...

This paper introduces an optical measurement system for shock wave characteristics. The system works by mountinga metal plate attached to spring mounts against the shock wavefront. This set is sealed and can plot the shock wave pressure diagram by measuring plate's displacement, radiation and changing the reflection of light during shock wave conflict, and converting these optical data to volta...

In this paper, the surface displacement response of a-nite uid{loaded shell and the resulting far eld acoustic pressure are studied. A high resolution signal processing algorithm is applied to the surface displacement to estimate the constituent wave numbers and corresponding amplitudes for these wave components. This parameter estimation technique identiies the uid{loaded cylinder's complex di...

Left ventricular pressure-flow relations were studied, using excised working rabbit hearts and imposing constant flow ejections (flow-clamps) to separate the effects of flow on pressure from those of time, flow duration, starting volume, ejected volume, and volume at specified time. Pressure-flow data at given volume and time were independent of flow duration, starting volume, and ejected volum...