A Mössbauer study of Pb4Fe3O8Cl,a three-layer magnet

The study of Mössbauer spectra from Pb₄Fe₃O₈Cl allows the observation of crystallographic sites associated with two kinds of magnetic layers present in the structure. Magnetic order appears simultaneously in the two sites below T_N at 602 K. The following features are observed (i) magnetic moments in a plane of easy magnetization perpendicular to the fourfold axis, (ii) antiferromagnetic behavior, as evidenced by the rotation of the magnetic moments under the effect of an external field, (iii) slightly different critical exponents β (0.311 ± 0.003 and 0.295 ± 0.003) for the two magnetic layers.     

Designing Firm Integrating Processes from the Knowledge-Based View—Graduate Student Best Paper Award, CASOS 2002 Conference

The knowledge-based view provides a powerful perspective for analyzing and understanding the firm. However, some of its assumptions have proven difficult to operationalize, making hypothesis testing difficult. One strategically important assumption is that firm competitive advantage depends on effective integrating processes. This paper develops a more precise specification of effective integrating processes. Then, two integrating processes are modeled using an agent-based simulation approach to test a set of factors believed to influence knowledge transfer and application. Results support several hypotheses generated by the knowledge-based view including: (1) greater levels of tacit knowledge transfer enhance the performance benefits gained from integrating processes, and (2) integrating processes with greater task uncertainty benefit from more formal information communication. The results also suggest that the design and management of firm integrating processes is a complex undertaking that requires a clear understanding of (1) the primary performance measure(s) used to evaluate the process, (2) the nature of the process tasks (e.g., routine vs. idiosyncratic), and (3) the knowledge required to perform those tasks (e.g., explicit vs. tacit).     

Synthesis of Some Functionalized Peptomers via Ugi Four-Component Reaction

This article describes the synthesis of new peptomers through a simple and efficient route using a one-pot Ugi four-component reaction. The synthesis started from either carboxylic acids or protected amino acids, primary amines, aldehydes, and isocyanides in anhydrous methanol and proceeded under stirring at room temperature. The reaction produced several functionalized peptomers in good yields (67–80%). These compounds are versatile multifunctional intermediates that can be further unprotected or functionalized to generate new molecules with numerous applications in the field of biomedicine.