Effects of charge rate and cycling on the morphology of Cd and Cd(OH)2 in sintered plate electrodes

Optical and scanning electron microscopy have been used to study the growth and redistribution of Cd and Cd(OH)₂ in sintered plate electrodes as a function of charge rate and cycle number. As expected, the growth of both components was found to increase with increasing cycle number and decreasing charge rate. Because the deposits, particularly after extended cycling, always contained appreciable quantities of Cd metal in both the charged and discharged state, the sizes of Cd(OH)₂ crystallites were difficult to quantify. High charge and discharge rates promoted greater aggregation and redistribution of active material towards the electrode edge. This resulted in a considerable decrease in the available pore volume per unit mass of active material and in extreme cases to localized pore blockage. The trapping of Cd metal by highly crystalline, unchargeable hexagonal platelets of (-Cd(OH)₂ resulted in about 50% of the active material becoming obsolete after 100 cycles at high charge and discharge rates. At this stage only the finely divided Cd metal in the electrode interior continued to function. Low charge rates gave deposits of more uniform size and distribution but these contained a high percentage of large Cd particles which discharged less efficiently than those produced at the high charge rate.     

The flow of non-Newtonian slurries through fixed and fluidised beds

Measurements have been taken of the flow rate, pressure drop and bed height characteristics when non-Newtonian slurries flow through fixed and fluidised beds of uniformly sized spherical particles.In the case of fixed beds, the pressure drop-flow rate data has been interpreted using the capillary model of a porous medium together with rheological data for the slurries obtained from a tubular viscometer. The resulting friction factor-Reynolds number relationship is

This correlation was used to satisfactorily predict the minimum fluidisation velocity for a given solid/liquid system by equating the pressure drop to the net weight per unit area of particles in the bed. However, the correlation was not adequate for the prediction of bed expansion in the fluidised state. For systems which have a Reynolds number at minimum fluidisation, Re′_mf′ less than 40 an effect of particle diameter to bed diameter was observed. For systems having Re′_mf >40 the velocity, υ, and voidage, ?, were related to their values at minimum fluidisation by

It is therefore clear that, in the fluidised state, the capillary model does not present an adequate basis for the prediction of bed expansion.     

The effects of examiner race on the articulation responses of black school-aged children

A program for the integration of chronic psychiatric patients into independent living in the community is described and data indicating its success are presented. The program is based on an educational, behavioral, social systems model, where "educational" refers directly to teaching skills which a person lacks, "behavioral" deals with providing the motivation to perform these skills and to precisely operationalize and measure the effectiveness of the steps in learning them, and "social systems" describes influencing clients' social environments in their interests. The model has wider implications for reintegrating a variety of socially marginal individuals into the mainstream of society.     

Intraventricular chemotherapy in neonatal meningitis

All of 16 infants with neonatal meningitis treated during a 30-month period were found to have accompanying ventriculitis at the time of the initial ventricular puncture. Fifteen of these infants were caused by gramm-negative organisms. All infants received antibiotics systemically and intraventricularly via an implanted ventriculostomy reservoir or by direct ventricular injection. Antibiotic concentrations within the ventricular fluid were monitored during chemotherapy; the complications encountered during treatment are discussed. Fifteen infants survived the infection; of these, seven infants were normal at follow-up examinations. In our experience intraventricular chemotherapy as an adjunct to systemic administration of antibiotics has greatly reduced the mortality rate in neonatal meningitis.     

Evaluation of laboratory methods for the study of driver behavior: Relations between simulator and street performance.

Road performance data on 304 taxi drivers were obtained by pairs of trained observers using behavioral checklists. Drivers did not know they were being observed. 66% of the drivers then agreed to participate in the laboratory study, which involved performance on 2 different driving simulators and on 4 perceptual–motor tests. Officially recorded accidents and violations over a 5-yr period were obtained for each S for comparison with performance data. Results show that few of the scores from the simulators or tests were significantly correlated with road performance; however, a number of significant relations were found between perceptual–motor test performance and simulator performance. Although these correlations were not high, they tended to be more significant than those between performance on the 2 simulators. Age was negatively correlated with simulator performance. Relations between all performance measures and officially recorded accident and violation data were low. Some significant predictors of certain classes of violations were achieved from road performance measures obtained in the study. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Free-electron lasers: reliability, performance, and beam delivery

The Vanderbilt free-electron laser (FEL) is a continuously tunable source of pulsed, mid-infrared radiation. FEL applications research has been underway for a decade. Recent experimental advances in FEL ablation of soft tissue indicate the potential for FEL-based protocols in surgery and medicine. In anticipation of these medical applications, the Vanderbilt FEL is being upgraded to meet the reliability and performance standards for a medical laser. Facilities for laser surgery have been constructed and equipped and medical delivery systems are being developed for pre-clinical and clinical research     

Toward a pluralistic animal science: postliberal feminist perspectives

Women have not had the authority to define the conditions of animal agriculture or to develop strategies for addressing its problems because the field of animal science has been and remains dominated by men. Therefore, criteria for assessing the professional performance of animal scientists reflect the views of men and the experiences of masculinity. Recent attempts to improve the retention rates of women in the animal science profession have focused on socializing female protégés to the norms and expectations of the discipline. This approach is based on traditional liberal beliefs that all humans are essentially alike and that embodiment and(or) social location are irrelevant in understanding the world. Such socialization assumes that problems of gender inequity can be solved by providing opportunities for women to succeed in the existing system, with its existing norms. This approach ignores the possibility that the structure of women's lives and the normative commitments arising from women's experiences may be quite different from those of men. Professional reward structures that favor the life experiences and perspectives of men and ignore those of women coerce women into adopting values that may be incompatible with their identities. This not only devalues their perspectives and contributions, it forces them to commit self-betrayal. This is both harmful and antithetical to the idea of an empirically relevant science that blends multiple perspectives and understands diverse values. Substantive diversity in the animal science community requires standards that reflect and accommodate the pluralism in which we live.