A 56-year-old woman was admitted for recurrent, refractory congestive heart failure. When she was aged 17 years, she had a Hodgkin lymphoma treated by chest radiation. She then developed postradiation heart disease, which required surgery in 2004, combining mitral valve repair using a Physio semirigid ring sized 28 mm (Edwards Lifesciences Inc; Irvine, CA) and tricuspid annuloplasty. In March 2...

A 56-year-old woman was admitted for recurrent, refractory congestive heart failure. When she was aged 17 years, she had a Hodgkin lymphoma treated by chest radiation. She then developed postradiation heart disease, which required surgery in 2004, combining mitral valve repair using a Physio semirigid ring sized 28 mm (Edwards Lifesciences Inc; Irvine, CA) and tricuspid annuloplasty. In March 2...

Coupling model for two-dimensional mixed-compression supersonic inlet with Mach number of 2.5 at design point and pulse detonation combustor was established, three working schemes were designed to investigate multi cycle process by using unsteady numerical simulation chemical reaction. The results show that the following two measurements can both restrain back-propagating compression wave broad...

In order to improve the performance of the hydraulic support electro-hydraulic control system test platform, a self-tuning proportion integration differentiation (PID) controller is proposed to imitate the actual pressure of the hydraulic support. To avoid the premature convergence and to improve the convergence velocity for tuning PID parameters, the PID controller is optimized with a hybrid o...

The paper proposes a new double-stage large flow protection relief valve based on the linkage structure, to solve problem that when it is impacted by top plate, traditional hydraulic support protective has smaller overflow and lower sensitivity, which causes column circuit be damaged. field characteristics of are numerically simulated computational fluid dynamics method semi-implicit connection...

Helical compression springs are widely used in various assemblies to store energy. In valves, it is prominently hold the valve on its seat against fluid pressure. Function of a relief depends mainly sealing force offered by springs. The operational accuracy sensitivity and linearity response spring presented work analysis for attempted. Two coil diameters wire diameter designed using MATLAB cod...

Prenatal echocardiographic diagnosis of heart defects is important because it permits counseling of the parents with regard to prognosis and treatment options and prepares the medical team for the treatment postnatally. A male infant with absent pulmonary valve syndrome diagnosed prenatally at 22 weeks' gestation is reported. This congenital anomaly is characterized by absent or rudimentary pul...