For the problem of low efficiency of conventional valve control systems, an economical PWM-based valve control system with no throttle loss is put forward and examined in this paper. There are four no-throttling-loss units used to control a single rod cylinder in this fixed displacement pump system, which breaks the mechanical linkage of meter-in and meter-out flow in the traditional four way d...

This paper addresses the impact of mechanical vibrations different frequencies on a particular type valve. It has been shown that neural network can be used to compress measurement data and determine frequency range is most important in describing micro-hydraulic overflow Later, induction decision trees were for generated areas, determining key points. The areas dependence are determined using ...

THE BIOCAPSULE AND ASSOCIATED E Q U I P M E N T Compared wit'h the capsule for BioFlight 1 the new .capsule was constmeted from a somewhat heavier aluminum alloy sheet to avoid the use of reinforcing ribs. Two access ports located ,on opposite sides of the capsule were provided to facilitate placement of equipment inside the c~psule. An additional small opening was located near fhe one used for...

Three patients operated upon under hypothermia for severe valvular pulmonic stenosis had right ventricular pressures in excess of 100 mm. Hg after open valvotomy. The residual obstruction, localized by pressure measurements to the subvalvular region, appeared to be due to greatly hypertrophied musculature in the outflow tract of the ventricle. Infundibular resection was not attempted. Electroca...

OBJECTIVES Hemodilution induced by cardiopulmonary bypass (CPB) often prevents open heart operations without blood transfusion because of a large CPB-priming volume. A vacuum-assisted venous drainage system appears to overcome this problem and our previous experimental study demonstrated the beneficial effect of a vacuum-assisted CPB with a pressure relief valve. In this study, we clinically ap...

since knowledge on hydrodynamic torque of a butterfly valve is very important for butterfly valve design, its hydrodynamic torque is investigated in this paper. in reality, the investigation of the loss coefficient and torque from some experiments will take a long time and a lot of money. this paper presents a statistical study of the flow past the butterfly valve in a static analysis using com...

We report a case of hypertrophic obstructive cardiomyopathy (HOCM) successfully treated with septal myectomy and mitral valve replacement (MVR) combined with a resection of the hypertrophic papillary muscles. The patient, a 74-year-old woman, first underwent the conventional septal myectomy through aortotomy. The papillary muscles revealed a marked hypertrophy, but extended myectomy and precise...

Of 60 patients aged 45 to 66 years with aortic valve stenosis, 28 (47 per cent) had angina pectoris. Significant coronary arterial obstruction was shown by selective coronary cineangiography in 14 of them. Systolic pressure gradients across the aortic valve were lower in patients with angina than in those without. In those with angina, systolic gradients were higher in those with normal coronar...

Small diesel engines are widely used for commercial vehicle and passenger car applications due to their higher torque requirements, fuel economy, and better thermal efficiency. These engines are exposed to different operating and environmental conditions and hence emissions from these engines are erratic. Strategies are required to enhance performance and reduce engine-out emissions considering...