Internship Training: Do Models Really Matter?

During the past 50 years, a number of models of training (scientist-practitioner, practitioner-scholar, clinical scientist) have been developed. This study examined how these models are conceptualized and implemented at internship and postdoctoral training programs. Surveying 248 internship programs (42% response rate), the authors found that the model name (i.e., scientist-practitioner) was not related to how programs were conceptualized or how their training was implemented, raising questions about accreditation requirements. Implications for training sites and the American Psychological Association Committee on Accreditation are explored. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The Effect of Stearic Acid on Expanded Organoclay and Rheometric Properties of Natural Rubber/Expanded Organoclay Nanocomposites

The effect of stearic acid on expanded organoclay and rheometric properties of natural rubber （NR）/expanded organoclay （OCSA） was studied. The expanded organoclay was prepared by melting of stearic acid （SA） in an oven at 100 ~C for 1 h. NR/expanded organoclay nanocomposites were prepared by melt intercalation technique using a laboratory open mill followed by compression molding. The characterizations were carried out by means of X-ray diffraction, field emission scanning electron microscopy （FESEM） and moving die rheometer. The results showed that the stearic acid intercalated in the gallery of organoclay （OC） Cloisite~ 20A, so the d-spacing of organoclay increased with increasing of stearic acid concentration. The rheometric properties showed that the increasing concentration of stearic acid in NR compound improved the resistance to reversion but contrary for NR/OCSA compounds. The curing time of NR filled expanded organoclay compounds were faster than NR compounds. The increasing of stearic acid in rubber compounds and NR/expanded organoclay compounds increased the curing time （tgo） of compounds. The increasing concentration of stearic acid reduced the size of aggeragate especially for ratio OC：SA - 1：l which OCSA dispersed uniformly in NR matrix.     

Change in the polarization of partially coherent electromagnetic beams propagating through the turbulent atmosphere

We study the changes in the degree of polarization of an electromagnetic Gaussian Schell-model beam, as the beam propagates through the turbulent atmosphere. We demonstrate that, within the framework of the Tatarskii model of the turbulent atmosphere, the degree of polarization of the beam changes appreciably at relatively short propagation distances in the atmosphere. In the long-propagation distance limit, however, we find that the degree of polarization of the beam tends to the value that it has in the source plane.     

Effects of linear non-image-forming devices on spectra and on coherence and polarization properties of stochastic electromagnetic beams: part I: general theory

The classic theoretical techniques of polarization optics are the Jones calculus and the Stokes-Mueller calculus. Both deal with transmission of certain ‘one-point’ quantities, which are associated with a light beam. Recently ‘two-point’ quantities were introduced, which are the elements of a 2?×?2 cross-spectral density matrix that characterizes the correlations at two points in a beam or which are expressible in terms of them. Unlike the quantities with which the Jones and the Stokes calculus deal, these generalized quantities contain information not only about the polarization properties of the beam but also about its coherence properties. In this paper we present a generalization of the Jones calculus and of the Stokes-Mueller calculus for transformations of the new two-point quantities by linear non-image-forming devices. They may act on the beam in a deterministic or in a random manner.     

Noise properties of chord-image reconstruction

Recently, there has been much progress in algorithm development for image reconstruction in cone-beam computed tomography (CT). Current algorithms, including the chord-based algorithms, now accept minimal data sets for obtaining images on volume regions-of-interest (ROIs) thereby potentially allowing for reduction of X-ray dose in diagnostic CT. As these developments are relatively new, little effort has been directed at investigating the response of the resulting algorithm implementations to physical factors such as data noise. In this paper, we perform an investigation on the noise properties of ROI images reconstructed by using chord-based algorithms for different scanning configurations. We find that, for the cases under study, the chord-based algorithms yield images with comparable quality. Additionally, it is observed that, in many situations, large data sets contain extraneous data that may not reduce the ROI-image variances.     

Synthesis method of nanomaterials by pulsed plasma in liquid

A new synthesis method of nanomaterials using pulsed plasma in liquid by the low voltage spark discharge is presented. The fullerene C60 and TiO nanopowder were for the first time synthesized by electric discharge method in liquid. The purity of C60 was >99%, which is much higher than those by the conventional arc plasma in inert gas methods (less than 80% C60 and 20% C70 and other fullerenes). Copper nanoparticles prepared by this method were smaller than those by arc method by a factor of >5. The pulsed plasma in liquid enables us to quench from plasma state, by which we can synthesize nanomaterials, metastable materials, etc. In addition, the applied power is 100 times smaller than those of arc discharge.     

Long-Term Administration of Cod Liver Oil Ameliorates Cognitive Impairment Induced by Chronic Stress in Rats

Cod liver oil (CLO) is a rich source of omega-3 fatty acids (FA), especially eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). The existing data suggest that EPA and DHA are the active agents of fish oil. In this study, we tested a hypothesis that the active constituents of CLO alleviate the negative impact of prolonged restraint stress on cognitive functions of male Wistar rats. Specifically, we attempted to characterize the preventive action of long-lasting treatment with CLO [0.375 ml/100 g body weight (equivalent to a dose of 300 mg/kg DHA and 225 mg/kg EPA), p.o. for 21 days] against an impairment caused by chronic restraint stress (2 h daily for 21 days) on recall as tested in a passive avoidance situation and on the spatial reference and working memory tested in a Barnes maze as well as on locomotor activity and anxiety behavior tested respectively in an open field and elevated plus-maze. We found that CLO administration statistically significantly (p < 0.01, both) prevented the deleterious effects of chronic restraint stress on recall and the spatial memory.     

Onion-like carbon-encapsulated Co,Ni, and Fe magnetic nanoparticles with low cytotoxicity synthesized by a pulsed plasma in a liquid

We synthesized onion-like carbon-encapsulated Co, Ni, and Fe (Co–C, Ni–C, and Fe–C) magnetic nanoparticles with low cytotoxicity using pulsed plasma in a liquid. The pulsed plasma is induced by a low-voltage spark discharge submerged in a dielectric liquid. The face-centered cubic Co and Ni, and body-centered cubic Fe core nanoparticles showed good crystalline structures with an average size between 20 and 30 nm were encapsulated in onion-like carbon coatings with a thickness of 2–10 nm. Vibrating-sample magnetometer measurements revealed the ferromagnetic properties of as-synthesized samples at room temperature (Co–C = 360 Oe, Fe–C = 380 Oe, and Ni–C = 211 Oe). Raman-spectroscopy analysis found onion-like carbon shells composed of well-organized graphitic structures. Thermal gravimetric analysis showed a high stability of the as-synthesized samples under thermal treatment and oxidation. Cytotoxicity measurements showed higher cancer cell viability than samples synthesized by different methods.