Extracting coupling and loss coefficients from a ring resonator.

A method is developed for extracting the coupling and loss coefficients of ring resonators from the peak widths, depths, and spacings of the resonances of a single resonator. Although the formulas used do not distinguish which coefficient is coupling and which is loss, it is shown how these coefficients can be disentangled based on how they vary with wavelength or device parameters.

Superconductivity at 40 K in the Oxygen-Defect Perovskites La2-xSrxCuO4-y.

Structural, magnetic, and electronic properties of compounds in the series La2-xSrx CuO4-y for 0.05

Effects of chronic unemployment and acute psychological stress on sexual arousal in men.

Effects on sexual arousal of unemployment and acute stress were studied in men. Ten unemployed (high-chronic-stress) and 9 employed (low-chronic-stress) men were exposed to two erotic videotapes in the laboratory. Acute stress was induced by telling the men that they would have to give a talk on their own sexual behavior and fantasies. Half the men were told about the talk before seeing either erotic tape, the other half were told in between the two erotic tapes. Cardiovascular measures confirmed the stressful nature of this manipulation. Results showed that the unemployed men achieved less penile tumescence than the employed men when stressed prior to erotic stimulation. Presentation of the stressor between the erotic videotapes (after sexual arousal occurred) produced no differences between the employed and unemployed men. These results suggest that impairment of erection occurs as a result of a combination of chronic and acute stress.

Neuropsychologic assessment of long-term survivors of childhood leukemia.

Thirty-two long-term survivors of childhood leukemia who were followed up at the University of Texas M. D. Anderson Hospital were evaluated with a battery of 17 neuropsychologic tests. These tests were selected to assess the development of cognitive skills and functions associated with brain impairment in children. Statistically significant differences were found between the group of children given CNS irradiation and the nonirradiated group on full-scale IQ and verbal IQ scores, mathematics skills, constructional skills, and memory for spatial material. Of particular interest was the absence of differences in language-based measures of verbal memory and the presence of group differences on measures of memory for spatial material. While the sample size was small, the findings delineate specific areas likely to be affected. These results indicate the need for caution when including cranial irradiation in CNS prophylaxis. When any CNS treatment is given, it seems appropriate that provisions be made for assessment and remediation of affected skills.