Printed Circuit Heat Exchangers (PCHEs) is a kind of compact plate heat exchanger with lot fine channels in solid block, called PCHE core. It can withstand high temperature and pressure. And beyond that, it has many advantages, such as exchange efficiency, low pressure drop, compactness, good corrosion resistance, long service life other advantages. However, PCHEs will endure complex mechanical...

With the rising demand for national security and expanding role of police forces, agencies have invested heavily in information technologies to support their expanded mandates. However, link between investment technology performance remains unclear. In this article, we examine effective use a system context implementation. We develop test an model based on representation theory adapt it specifi...

Kachanov’s simplifiedmodel ofmicrocrack interaction is applied to an investigationof the behaviour of a cracked body under predominantly compressive periodic loading, so that the cracks experience periods of closure and slip, with frictional dissipation. The model is shown to be equivalent to a discrete elastic frictional systemwith each crack representing one node. Theorems and algorithms from...

A detailed model of the role of asperities in crack closure has been initiated in Part 1 of this article. Crack opening stress is defined as the far-field stress required to overcome the asperity-induced contact stresses along the crack. In this Part 2, the magnitude of crack opening stress is established as a function of roughness (s0); asperity density (N); maximum stress level (Smax/Sy); sha...

Received: 26 January 2005 Revised: 24 May 2005 Accepted: 30 August 2005 Abstract When adopting an enterprise resource planning (ERP) system, experiencing misalignments between the functionality offered by the package and that required by the firm is common. Implementing an ERP package often necessitates disruptive organizational change, and the outcome of implementation is largely determined by...

35th ANNIVERSARY ISSUE Sinusoidal vibration testing has evolved over the years for many good reasons. Initially, from a military standpoint, a predominant part of vibration excitation was from propeller driven aircraft. Here, system resonances could easily be excited during runup, or in the more unfortunate circumstance, during sustained operation at flight speed. Although there initially was o...