Sex differences in performance and in cortical activation patterns during mental rotation have rather consistently been reported. Data regarding sex differences of event-related potentials during the classic three-dimensional mental rotation task developed by Shepard and Metzler, however, are absent, and were therefore being addressed by this study. Mental rotation-related event-related potenti...

This chapter will focus on critically evaluating some selected new methods to achieve the asymmetric synthesis of a-amino acids. It is not meant to be comprehensive, but rather to reflect some of the possibilities opening up in this area. The study of a-amino acids is one of fundamental importance to many areas of chemistry and its relation to molecular biology. Nature only utilizes 20 amino ac...

In this paper we derive global Bayes factors for the comparison of a parametric model with a nonparametric alternative. The alternative is constructed by embedding the para-metric model in a mixture of Dirichlet Processes. Results include a general explicit form for partially exchangeable sequences as well as closed form expressions in the context one-way analysis of variance. Our results raise...

Using Chandra images of cluster cores with clear radio bubbles, we have determined k, which is the ratio of the total particle energy to that of the electrons radiating between 10 MHz and 10 GHz. Radiative and dynamical constraints on the bubbles indicate that the ratio of the energy factor, k, to the volume filling factor, f , lies within the range 1 . k/f . 1000. Assuming pressure equilibrium...

The development of alloantibodies or inhibitors is the most serious complication a patient with severe hemophilia can experience from treatment with clotting factor concentrates. Although common in previously untreated patients, inhibitor development is rare in multiply exposed, well-tolerized patients. There has been a nonevidence-based reluctance to change concentrate because of a perceived g...

Most research in managerial effectiveness, or competence, focuses upon personal attributes of the individual. There are, however, additional influences operating on the ability to be effective. A national survey study assessed the impact of 28 variables as to whether they help or hinder the ability to be effective. Factor analysis revealed seven factors (Poor Organisation Support; Family Respon...

The main purpose of the present study is to assess a hospital's Performance assessment with regard to EFQM model and then determining the relationship between nine criteria and Organizational model of excellence with hospital's Performance. The research method was Survey –Correlation and the selected sample included all managers and 203 employees were selected. To collect data a standard questi...

We report in this letter our analysis of a large sample of photospheric vector magnetic field measurements. Our sample consists of 17200 vector magnetograms obtained from January 1997 to August 2004 by Huairou Solar Observing Station of the Chinese National Astronomical Observatory. Two physical quantities, α and current helicity, are calculated and their signs and amplitudes are studied in a s...

The zitterbewegung is a local circulatory motion of the electron presumed to be the basis of the electron spin and magnetic moment. A reformulation of the Dirac theory shows that this interpretation can be sustained rigorously, with the complex phase factor in the wave function describing the local frequency and phase of the circulatory motion directly. This reveals the zitterbewegung as a mech...