Dynamic simulation of three-dimensional rigid body systems using Vector-Network techniques

This paper describes a new approach to the problem of motion prediction. An extension of the “Vector-Network” method to rigid body systems in 3-D is introduced. This procedure, with its computational implementation, is shown to eliminate the work of analytically modelling a dynamic system in order to generate its time response. The entire procedure (Vector-Network) is a basic application of concepts of graph theory in which laws of vector dynamics are combined. The principle of orthogonality is reviewed and a specific application to the generation of equations of motion is presented. Moreover, various new terminal equations are shown to be necessary in the derivation of this algorithm. It is observed that this procedure is very attractive and may prove to be helpful due to its simplicity and basic application of Newton's law.     

Gastrointestinal upsets associated with ingestion of copper-contaminated water

During 1992 and 1993 the Wisconsin Division of Health investigated five cases in which copper-contaminated drinking water was suspected of causing gastrointestinal upsets. Each of these case studies was conducted after our office was notified of high copper levels in drinking water or notified of unexplained illnesses. Our findings suggest that drinking water that contains copper at levels above the federal action limit of 1.3 mg/l may be a relatively common cause of diarrhea, abdominal cramps, and nausea. These symptoms occurred most frequently in infants and young children and among resident of newly constructed or renovated homes.     

Impact of noise and nonlinear distortion due to clipping on the BERperformance of a 64-QAM signal in hybrid AM-VSB/QAM optical fibertransmission system

Experimental BER measurements of a 64-QAM signal in a hybrid AM-VSB/QAM optical fiber transmission system are shown to be in good agreement with a corrected and reinterpreted theory of impulsive and Gaussian noise based on Middleton's class B impulsive noise model. Fiber dispersion induced distortion of the chirped laser output is also shown to adversely affect the QAM signal     

Parents' nonshared treatment of siblings and the development of social competence during adolescence.

This article proposes that there is a distinction between shared (SH) and nonshared (NSH) parenting. This study investigated the contribution of these aspects of parenting to indexes of social competence in adolescents by means of a multimethod, multimeasure study. NSH parenting was predictive of child adjustment at least as strongly as was SH parenting. The NSH components, however, were child-directed relations instead of sibling-directed relations. Parental treatment of a sibling thus added information about SH environmental processes, but did not provide information about independent NSH processes. NSH components predicted social responsibility and cognitive agency rather than autonomy, sociability, and self-worth. NSH conflict, shared monitoring and control, and both SH and NSH warmth were important for the prediction of adjustment. These relations were consistent across gender and were characteristic of a broad array of family types. (PsycINFO Database Record (c) 2010 APA, all rights reserved)