T.J. Trella, U.S. Department of Tr~nsportation, Transportation Systems Center, Cambridge, Massachusetts 02142 and A mathematical model of non-linear reciprocating air-compressor discharge valve . system unsteady response was presented :n Part I. As a first step, to demonstrate the application of the unsteady modeling approach, a comparison of discharge discvalve response was made with a more po...

This work presents a comparison of thin film gauge (TFG) and infrared (IR) thermography measurement techniques to simultaneously determine heat transfer coefficient and film cooling effectiveness. The first comparison was with an uncooled vane where heat transfer coefficient was measured at Mex=0.77 and Tu=16%. Relatively good agreement was found between the results of the two methods and the e...

*Correspondence: [email protected] 2School of Mathematical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Selangor 43600 UKM, Malaysia Full list of author information is available at the end of the article Abstract An analysis is carried out to study the heat transfer characteristics of steady two-dimensional stagnation-point flow of a copper (Cu)-water n...

The effects of compressor speed variation on the heat transfer inside a speed controlled compressor were investigated in this study. Based on the lumped capacitance ntethod, the temperatures of the compressor components, the oil, and the refrigerant gas within the shell were modeled and simulated on a relative scale. A diffenmt heat transfer coefficient correlation was developed to evaluate the...

The present paper analyzes the MHD effects on the steady free convective boundary layer flow of a viscous incompressible fluid over a linearly moving porous vertical semi-infinite plate with suction and viscous dissipation. The governing boundary layer equations are reduced to a two-point boundary value problem using similarity transformations. The resultant problem is solved numerically using ...

Vacuum grippers are often notably diffused for grasping and moving very large and heavy objects. The absence of theoretical models able to foresee the behavior of the suction cup notably limits the applications and development of vacuum grippers. In this work, a study of grasping with a vacuum gripper has been carried out. A mathematical model is proposed for determining the forces of contact b...

The main aim of the paper is to present a Matlab program for control of time-delay systems using three various modifications of Smith predictor. The software implementation includes the modification for unstable and integrating processes, PI-PD modification for systems with long dead time, and modification applying control design by Coefficient Diagram Method (CDM). The freely downloadable prog...

Abstract—A theoretical study has been presented to describe the boundary layer flow and heat transfer on an exponentially shrinking sheet with a variable wall temperature and suction, in the presence of magnetic field. The governing nonlinear partial differential equations are converted into ordinary differential equations by similarity transformation, which are then solved numerically using th...

PURPOSE We assessed the effects of percutaneous transhepatic biliary drainage on renal function in patients with obstructive jaundice using the estimated glomerular filtration rate (eGFR) and evaluated the factors associated with renal dysfunction. MATERIALS AND METHODS Between July 2007 and September 2009, 108 consecutive patients (69 men 39 women; median age, 59 years; range, 29-87 years) w...

d image in the discrete cosine transform (DCT) omain can generate blocky artifacts in the outs a put image. It is possible to reduce these artifact nd RMS error by adjusting measures of block g t edginess and image roughness, while restrictin he DCT coefficient values to values that would d i have been quantized to those of the compresse mage. We also introduce a DCT coefficient . amplitude adj...