Defects and glassy dynamics in solid He-4: Perspectives and current status

We review the anomalous behavior of solid He-4 at low temperatures with particular attention to the role of structural defects present in solid. The discussion centers around the possible role of two level systems and structural glassy components for inducing the observed anomalies. We propose that the origin of glassy behavior is due to the dynamics of defects like dislocations formed in He-4. Within the developed framework of glassy components in a solid, we give a summary of the results and predictions for the effects that cover the mechanical, thermodynamic, viscoelastic, and electro-elastic contributions of the glassy response of solid He-4. Our proposed glass model for solid He-4 has several implications: (1) The anomalous properties of He-4 can be accounted for by allowing defects to freeze out at lowest temperatures. The dynamics of solid He-4 is governed by glasslike (glassy) relaxation processes and the distribution of relaxation times varies significantly between different torsional oscillator, shear modulus, and dielectric function experiments. (2) Any defect freeze-out will be accompanied by thermodynamic signatures consistent with entropy contributions from defects. It follows that such entropy contribution is much smaller than the required superfluid fraction, yet it is sufficient to account for excess entropy at lowest temperatures. (3) We predict a Cole-Cole type relation between the real and imaginary part of the response functions for rotational and planar shear that is occurring due to the dynamics of defects. Similar results apply for other response functions. (4) Using the framework of glassy dynamics, we predict low-frequency yet to be measured electro-elastic features in defect rich He-4 crystals. These predictions allow one to directly test the ideas and very presence of glassy contributions in He-4.Comment: 33 pages, 13 figure

The Team Climate Inventory (TCI): A psychometric test on a Taiwanese sample of work groups

Understanding the feasibility of applying the Team Climate Inventory (TCI) in non-Western cultures is essential for researchers attempting to understand the influence of culture on workers' perceived climate. This study describes the application of the TCI in such a setting using data from 203 administrators employed in a Taiwanese medical center. Reliability and factor analyses were performed to establish the feasibility and psychometric properties of the TCI Taiwan version. Reliabilities of both the four- and five-factor solutions exceeded .80. Factor analyses indicated a satisfactory four-factor structure, despite some variations in comparison with the U.K. version. The TCI Taiwan version is feasible and has acceptable psychometric properties. Further research is warranted regarding the degree to which disparities result from cultural differences and the specific nature of organizational systems in Chinese communities

Managing Innovation in Organisations

Innovation and creativity at work have emerged as central concerns in recent years amongst applied researchers and practising managers alike. Little research, however, has addressed the influence of different group membership and organisational status on perceptions of innovation processes. The results of a longitudinal study into group perceptions of organisational innovations are presented. Implications for future research and for the management of innovation at work are discussed in conclusion

Business games and simulations: Which factors play key roles in learning

The paper reports the results of an empirical study on the effects and impact of a specific business game, which is also a team competition, treated as an innovative teaching tool in learning. The paper starts by introducing business games and simulations as methods able to improve learning experiences and goes on by dealing with the specific business game simulation used for the aims of our research. Considering the most relevant empirical studies on business games and simulations, the following four factors were extracted in order to test their importance for learning: Decision-Making Experience (DME), Teamwork (T), Simulation Experience Satisfaction (SES), Learning Aims (LA). Each construct has been investigated by using a questionnaire administrated to 48 participants of the Stock Market Learning Simulation divided into 10 teams. Results show the importance of these factors in detecting critics aspectal of learning using a business game simulation

Social identity patterns and trust in demographically diverse work teams

The article presents a model that links trust in a demographically diverse work context to three different social-identity patterns. Trust is considered to be beneficial for interpersonal relationships and work outcomes in diverse teams as well as for a healthy work relationship between minority members and their company. First, imposing a common ingroup identity based on similarities has been put forward as a useful method of creating depersonalized forms of trust among members of different demographic subgroups. However, its usefulness seems to be limited to situations of low identity threat. Alternatively, recent findings support the usefulness of creating a relational identity orientation or a common ingroup identity that explicitly embraces the value of diversity. The latter methods seem to enforce more personalized and more robust forms of identity-based trust in teams. They may also be useful in promoting trust of minority members in the organizational setting as a whole and in its authorities, probably because these identity patterns contribute to feelings of respect among minority members. Practical implications of these findings are discussed