A straight-through labyrinth seal is one of the most popular non-contacting annular seals through which energy dissipation by turbulence viscosity interaction achieved with a series teeth and cavities. The geometric parameters seal, such as clearance, tooth width, height, cavity inclination angle, affect its performance. space for installing in turbomachinery limited, so it important to optimiz...

Materials Engineering, with Elliott Company, in Jeannette, Pennsylvania, and has 34 years of experience in the turbomachinery industry. He is responsible for the metallurgical and welding engineering for the various Elliott product lines within the company. He is the author/coauthor of a number of technical articles related to topics such as abradable seals, high temperature corrosion, fracture...

nowadays, compressible flow transmission pipelines are used in many industrial processes. pipelines in chemical processes, gas turbine power plants, natural gas transmission lines, and high pressure steam transmission pipelines are some industrial examples. therefore, learning the manner of treatment of a transient compressible fluid flow in pipelines with junctions and branches is important. i...

in this paper, the dynamic simulation for a high pressure regulator is performed to obtain the regulator behavior. to analyze the regulator performance, the equation of motion for inner parts, the continuity equation for diverse chambers and the equation for mass flow rate were derived. because of nonlinearity and coupling, these equations are solved using numerical methods and the results are ...

background: the effective therapeutic dose of pralidoxime methylsulphate for organophosphate (op) poisoning is necessary to be clarified. this study was designed to comparatively assess the blood level of pralidoxime (bpl) and clinical outcomes in op poisoned patients treated with intermittent dosing and patients treated with continuous infusion. methods: this was a prospective, open labelled, ...

abstract        background and objective: measurement of amino acids is an important tool for metabolic studies and evaluation of patients’ clinical condition. the aim of this study was to analyze the plasma amino acids using reverse phase high performance liquid chromatography techniques (rp-hplc) with pre-column derivatization by o-phthalaldehyde (opa) in combination with 3- mercaptopropionic...

Current trends in micro-turbomachinery stress the need for adequate rotordynamic models. These models should allow accurate prediction of critical speeds, imbalance response and stable operation range of microturbomachinery rotor-bearing systems. This paper gives an overview of the total rotordynamic modelling process of a micro-turbine rotor supported on aerostatic bearings. A both accurate an...

there are many problems in the treatment of hypertension, so we use alternative medicine to achieve better results to solve these problems. in this article we describe a hypertensive patient resisted to conventional drugs and she had some other somatic and psychotic symptoms and was treated by homeopathy, a method of alternative medicine.

Turbomachinery miniaturization has been an emerging research field during the last decades and, especially, micro-scale radial compressors are becoming increasingly relevant due to development of high-speed electric motors. They can be found in a wide range applications such as micro gas turbines, aerial unmanned vehicles propulsion, fuel cells and even medical ventilators. Furthermore, use cen...