We studied the effects of positive end-expiratory pressure (PEEP) applied by the ventilator on respiratory mechanics in ventilated patients with chronic obstructive pulmonary disease (COPD). Airway pressures, relaxed expiratory flow-volume curves and end-expiratory volumes (EEV) were measured. In all patients investigated without PEEP applied by the ventilator, an intrinsic PEEP level (PEEPi) a...

In order to study the distribution of blood flow in diseased human kidneys, Xe133 washout curves were obtained from 34 patients with chronic renal disease or hypertension. The curves recorded for over 45 min. were resolved into 4 components, while the curves recorded for 30 min. showed 3 components. The values of components I, II and III in the 30 min. record coincided with those of the compone...

abstract stochastic model for synthetic data generation is not available for daily flows of intermittent streams. such a model is required in the planning and operation of structures on an intermittent stream for purposes where short time flow fluctuations are important. in this study a model is developed for such a case. the model consists of four steps: determination of the days on which flow...

Abstract—This paper evaluates oil displacement by water in Hauterivian sandstone reservoir of Kashkari oil field in North of Afghanistan. The core samples of this oil field were taken out from well No-21st, and the relative permeability and fractional flow are analyzed. Steady state flow laboratory experiments are performed to empirically obtain the fractional flow curves and relative permeabil...

Analytical Solutions and type curves for the constant rate radial flow of fluid in both conventional and naturally fractured reservoirs including the effect of wellbore phase redistribution are presented. An automated procedure for non-linear least square minimization using the analytical solutions and their derivatives with respect to the unknown parameters developed to analyze the pressur...

The physiology underlying inspiratory flow has been the subject of study for a long time. In the late 1950s, Hyatt et al did seminal investigations of the pressure, flow, and volume characteristics of the lung.1 In those early days the primary interest in flow-volume curves centered on expiratory flow, what controlled it, and how it was limited in various obstructive lung diseases.2 Even in the...

2 This thesis is concerned with the accretion flow in the high magnetic field cata­ clysmic variables known as polars. I first provide a brief introduction to the subjects discussed in this thesis, followed by an introduction to the instruments used to make the observations: the optical observations were made using the S-Cam 2 supercon­ ducting tunnel junction camera and X-ray observations usin...

We study the algebro-geometric aspects of Teichmüller curves parameterizing square-tiled surfaces with two applications. (a) There exist infinitely many rigid curves on the moduli space of hyperelliptic curves. They span the same extremal ray of the cone of moving curves. Their union is a Zariski dense subset. Hence they yield infinitely many rigid curves with the same properties on the moduli ...

We consider a motion of non-closed planar curves with infinite length. The motion is governed by a steepest descent flow for the geometric functional which consists of the sum of the length functional and the total squared curvature. We call the flow shorteningstraightening flow. In this paper, first we prove a long time existence result for the shortening-straightening flow for non-closed plan...

The behavior of four inflow performance relationships are analyzed and discussed. Two of them are developed for petroleum systems and two others are developed for geothermal fluid containing high and low salinity respectively. A methodology to determine the maximum flow rate (Wmax) that a well can produce for a specific stage of its productive life, using these inflow relationships is presented...