Now a day centrifugal pumps are vital components of industries. Certainly, one of the most important specifications of centrifugal pumps are the performance curves. In the present work, performance curves of a centrifugal pumps are obtained by Computational fluid dynamics (CFD) and as an outcome, CFD results compare by practical curves. At the first step impeller and volute are designed with tw...

2. Introduction. Let SI C R" be a bounded domain with smooth boundary F. We consider the problem pd2tu — /LiAu — (p + A)V(V ■ u) + aV9 = 0 in ft x R+, (2.1) pcpdt9 — kA9 + adtV • u = 0 in fl x where u is a time-dependent deformation vector field, 6 is the normalized temperature, p, p, and cp are positive constants, 2/x + A > 0 (p the density, /i and A are Lame's constants, and cp is the specifi...

The problem of zeroing the output in an arbitrary linear continuous-time system S(A, B, C, D) with a nonvanishing transfer function is discussed and necessary conditions for output-zeroing inputs are formulated. All possible real-valued inputs and real initial conditions which produce the identically zero system response are characterized. Strictly proper and proper systems are discussed separa...

one of the most serious complications of mitral valve replacement is left ventricular rupture and pseudoaneurysm formation, which is rare but potentially lethal. we herein present a late type of post mitral valve replacement and coronary artery bypass surgery pseudoaneurysm in a 74-year-old female, who was admitted to our hospital with a recent history of exertional dyspnea. she had the above-m...

Condition monitoring is the foundation of a condition based maintenance (CBM). To relate the information obtained from the condition monitoring to the actual state of the system, it is usually required a stochastic model. On the other hand, considering the interactions and similarities that exist between CBM and statistical process control (SPC), the integrated models for CBM and SPC have been ...

There is no theoretical or empirical evidence to suggest how the central nervous system (CNS) controls a variety of muscles associated with gait transition between walking and running. Here, we examined the motor control during a gait transition based on muscle synergies, which modularly organize functionally similar muscles. To this end, the subjects walked or ran on a treadmill and performed ...

in recent years, work for the information profession has become characterized by fast-paced change and new skills requirements. this transformation has been brought about by the constant emergence of relevant new technologies. in this paper, ict skills for professionals in developing countries are examined and nigeria research project is mentioned as an example. one of the important implication...

‎Some functional inequalities‎ ‎in variable exponent Lebesgue spaces are presented‎. ‎The bi-weighted modular inequality with variable exponent $p(.)$ for the Hardy operator restricted to non‎- ‎increasing function which is‎‎$$‎‎int_0^infty (frac{1}{x}int_0^x f(t)dt)^{p(x)}v(x)dxleq‎‎Cint_0^infty f(x)^{p(x)}u(x)dx‎,‎$$‎ ‎is studied‎. ‎We show that the exponent $p(.)$ for which these modular ine...

A woman in her 60s with insulin-dependent type 1 diabetes since childhood was referred as an outpatient for urological assessment because of recurrent lower urinary tract infections and macroscopic haematuria. She had suffered an episode of spasmodic back pain five days before the referral in question was issued, but no back pain since this episode. She had not had fever, and her general condit...