In order to solve the problems of lack of heart donors for transplant, implantable ventricular assist systems (VAS) have been developed to assist the failing heart ventricle. One of the components of a VAS is a blood pump that connects the left ventricle to the aorta. Therefore, the pump flow rate is influenced by the cardio-vascular system. To control the flow rate through the blood pump, real...

Along with the developments of high-speed and highperformance turbomachines, there has been increasing occurrence of rotational speeds higher than the first critical speed. Under these circumstances, turbomachines may suffer from severe vibration and rotor whirl caused by fluid-dynamic forces. As possible causes of whirling instabilities, fluid forces on journal bearings and seals are well know...

A large amount of carbon dust is generated in the process aluminum smelting by molten salt electrolysis. The solid hazardous waste but contains a quantity recyclable components such as and fluoride. How to recycle more effectively challenge electrolysis field. In this study, X-ray diffraction, scanning electron microscope, other methods were used analyze phase composition electrolytic dust. eff...

Abstract To design a green energy-saving heating pipe, this paper studied the structural transformation of pipe and carried out effect simulation analysis. The key is to add an impeller device inside ordinary convert part kinetic energy fluid in into mechanical impeller. generated by rotation can be transferred through gears, connecting rods, other components converted heat for recovery boiler ...

Right ventricular failure caused by myocardial infarction may be refractory to treatment designed to support the systemic ventricle. A new type of right ventricular assist device driven by an impeller pump was successfully used for 79 hours after emergency revascularisation after right coronary occlusion. Despite renal failure requiring haemofiltration the patient has now fully recovered.

The optimization of enterokinase fermentation was performed with a recombinant Saccharomyces cerevisiae. The maximum enterokinase yield and specific yield were obtained when the ratio of yeast extract to bacto peptone was 5:5. However, the fraction of plasmid-containing cells was approximately 65% for most nitrogen source ratios. From batch cultures, the minimum DOT level was found to be a key ...

Recombinant pharmaceutical proteins are being produced in different systems such as bacteria and mammalian cell cultures. The use of transgenic plants as bioreactors has recently arisen as an alternative system offering many practical and economic advantages. However, finding an optimum strategy for the downstream processing (DSP) of recombinant proteins from plants still remains a challenge. I...

We present detailed quantitative measurement analyses for flow in a spinner flask with spinning rates between 20 to 45 RPM, utilizing the optical velocimetry measurement technique of Particle Image Velocimetry (PIV). A partial section of the impeller was immersed in the working fluid to reduce the shear forces induced on the cells cultured on microcarriers. Higher rotational speeds improved the...

Rapid changes in the performance-related parameters of a pump during its startup operation lead to large pressure fluctuations and structural vibrations it. In view these problems, this study investigates evolution cavitation characteristics under centrifugal startup. We use finite volume method simulate dynamic process. To characterize acceleration, we assume that rotational speed rate flow ar...

RESEARCH ARTICLE Intensifying the Fermentation of Aspergillus oryzae in a Stirred Bioreactor Using Maxblend Impeller Narges Ghobadi, Chiaki Ogino and Naoto Ohmura Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University 1-1 Rokkodaicho, Nada-ku, Kobe 657-8501, Japan Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe Univer...