A tube and shell heat exchanger having compact, high performance characteristics in which the core unit comprising tube assembly, headers and baffles is removably installed in a shell and has a cushioned mounting therein. A use of resilient O-rings on the headers is contemplated as well as a use of flexible, resilient baffles, one of which wraps the core unit and acts as a seal by-pass member.

A unitary plate type heat exchanger structure in which stacked core sheets, tube sheets, continuous frame members, nose pieces and corrugated fin material are joined together as by brazing to form a one-piece construction with integrated flow passages for at least one of the fluids. The parts combine with one another in a manner facilitating assembly and obviating separate attachment of a manifold means. Interior parts, including nose pieces, frame members and tube sheets are structured inherently to provide flow passages for a confined fluid. In the brazing process the parts are interconnected in a manner to resist deformation and separation of formed joints, and, means are installed to obviate the effects of high internal pressure, particularly at confined fluid inlet and outlet locations.

The article focuses on the concept of sibling relationship. The direct effect of siblings on one another during the childhood years is poorly understood by theorists and practitioners alike. Even in family centered agencies, attention is almost exclusively directed toward the husband-wife and the parent child subsystems. Perhaps the reason that little scholarly attention has been devoted to the sibling relationship by any of the social sciences or helping professions is that this relationship is overshadowed by the powerful parent child dyad. The sparse and scattered scientific knowledge of sibling interaction that exists is drawn largely from the untested folklore of child rearing, armchair opinions of family theorists, and the insights of psychoanalytically oriented clinicians dealing with abnormal populations. Most important, it is an ascribed world in which, for better or for worse, siblings must involuntarily spend long hours, days, and years together. Over these long years of childhood they help to build one another's identity through interaction.