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Models Fail (models + fail)

Distribution by Scientific Domains

Business, Economics, Finance and Accounting	40%

Selected Abstracts

Unravelling the complexities of high commitment: an employee-level analysis

HUMAN RESOURCE MANAGEMENT JOURNAL, Issue 2 2009
Edel Conway
Research within HRM has faced criticism for failing to focus adequately on employee experiences of HR practice. In particular, the ,high-commitment' models fail to recognise employee perspectives on HRM, the complexities of the commitment construct and the possibility that organisations configure HR systems in various ways. This paper explores the impact of employee attitudes towards HR practices on affective, continuance and normative commitment, and intention to leave in three organisational contexts. The findings suggest that different HR systems can yield different attitudes towards HR practices, which in turn can impact on different forms of commitment and levels of intention to leave. The findings provide insights into the ways in which organisations manage the commitment process through HR practices and the response by employees to these interventions. [source]

Pore-scale simulations of unsteady flow and heat transfer in tubular fixed beds

AICHE JOURNAL, Issue 4 2009
P. Magnico
Abstract Small tube-to-particle-diameter ratio induces a radial heterogeneity in tubular fixed beds on the particle scale. In this complex topology, theoretical models fail to predict wall-to-fluid heat transfer. In order to be more realistic, a deterministic Bennett method is first used to synthesize two packings with a tube-to-sphere-diameter ratio of 5.96 and 7.8, containing 236 and 620 spheres, respectively. In a second step, unsteady velocity and temperature fields are computed by CFD. In the range of Reynolds number lying between 80 and 160, hydrodynamic results are validated with experimental data. The thermal disequilibrium in the near-wall region is described in detail. Several pseudo-homogeneous models are compared to the numerical simulations. The radial and axial profiles of temperature show a clear agreement with the model of Schlünder's research group and the model of Martin and Nilles. © 2009 American Institute of Chemical Engineers AIChE J, 2009 [source]

Centrifugal drum filtration: I. A compression rheology model of cake formation

AICHE JOURNAL, Issue 2 2006
John D. Barr
Abstract A compression rheology model is used to describe the behavior of networking solids undergoing centrifugal filtration under batch operation. A description of the batch filtration process is accomplished through the use of the rheologic functions for compressive yield stress py(,) and the hydrodynamic resistance R(,), with a characteristic pressure scaling, timescaling, and membrane resistance. Comparison of the results of this model to those found in engineering text books indicates that noncompression models fail to describe the variation in the cake resistance. The compression rheology model also predicts that the effective cake resistance is approximately 20% larger than that predicted by conventional theory. © 2005 American Institute of Chemical Engineers AIChE J, 2006 [source]

Trading Activity and Price Volatility in the Municipal Bond Market

THE JOURNAL OF FINANCE, Issue 2 2004
Chris Downing
ABSTRACT Utilizing a comprehensive database of transactions in municipal bonds, we investigate the volume,volatility relation in the municipal bond market. We find a positive relation between the number of transactions and a bond's price volatility. In contrast to previous studies, we find a negative relation between average deal size and price volatility. These results are found to be robust throughout the sample. Our results are inconsistent with current theoretical models of the volume,volatility relation. These inconsistencies may arise because current models fail to account for the effects of overall market liquidity on the costs of large transactions. [source]

Children's Primary Health Care Services: A Social-Cognitive Model of Sustained High Use

CLINICAL PSYCHOLOGY: SCIENCE AND PRACTICE, Issue 2 2001
David M. Janicke
Significant percentages of children exhibit patterns of sustained high use of primary health care services. Unfortunately, current models fail to explain the processes that drive and maintain such patterns. We draw upon the pediatric utilization and social-cognitive literature to develop a model that explains the mechanisms that ultimately drive and maintain patterns of prolonged high use. Specifically, we propose that parental stress and low self-efficacy for coping with various parenting and life demands interact to drive the utilization of pediatric services. We outlined sequelae of frequent physician that serve to maintain high use. This model suggests a number of psychological interventions that clinical health psychologists might undertake to remediate inappropriate, sustained high use of children's primary healthcare services. [source]